An impact-resistant stainless steel hot-rolled sheet and a method of manufacturing the same

Abstract

The application discloses an impact-resistant stainless steel hot-rolled plate and a manufacturing method thereof, and belongs to the technical field of duplex stainless steel plating. The manufacturing method comprises the following steps: using rare earth modified duplex stainless steel; performing heat treatment on the rare earth modified duplex stainless steel to obtain a modified duplex stainless steel hot-rolled plate; performing electroplating multi-layer treatment on the modified duplex stainless steel hot-rolled plate, then cleaning the modified duplex stainless steel hot-rolled plate with deionized water, and naturally drying the modified duplex stainless steel hot-rolled plate to obtain a rare earth modified duplex stainless steel electroplating composite layer hot-rolled plate; wherein the rare earth modified duplex stainless steel can significantly improve the mechanical performance of the duplex stainless steel caused by the secondary phase precipitation, and the electroplating composite layer can obviously improve the impact resistance of the duplex stainless steel.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of duplex stainless steel plating, in particular to an impact-resistant stainless steel hot-rolled plate and a manufacturing method thereof. BACKGROUND

[0002] Stainless steel is defined as an iron-based alloy containing at least 10.5% Cr. A thin and dense chromium oxide film formed on the surface of stainless steel can prevent further oxidation of the metal. Due to different alloying elements, stainless steel has different microstructures. Microstructure is the main basis for classifying stainless steel types. Among them, duplex stainless steel generally refers to stainless steel containing about equal amounts of ferrite and austenite in the microstructure, and the main alloying elements are about 24% Cr and 5% Ni.

[0003] The hot rolling process of hot-rolled plates is an important link in steel production. By heating and rolling the billet through a series of processes, hot-rolled plate products with certain size and shape are formed. Hot-rolled plates are widely used in construction, manufacturing and other fields. Therefore, research and optimization of hot-rolled plate rolling process is of great significance to improve product quality and production efficiency. Secondly, the electroplating process of duplex stainless steel is studied to improve its impact resistance. SUMMARY

[0004] The purpose of the present application is to provide an impact-resistant stainless steel hot-rolled plate and a manufacturing method thereof to solve the problems raised in the background.

[0005] In order to solve the above technical problems, the present application provides the following technical solutions:

[0006] A manufacturing method of an impact-resistant stainless steel hot-rolled plate, the manufacturing method comprises:

[0007] Step 1: smelt the stainless steel raw material into molten steel and cast into ingots, and place the ingots in a heating furnace for heating. The heating parameters in the heating furnace are: first raise the temperature to 800-850℃, heat for 50-80min, then raise the temperature to 1000-1200℃, keep the temperature for 35-60min, adjust the temperature to 1040-1100℃, continue to keep the temperature for 40-90min, then raise the temperature to 1250-1280℃, heat for 50-80min, to obtain an intermediate billet. Hot rolling, 5-7 passes of rolling are carried out during hot rolling, the opening rolling temperature is 1100-1250℃, and the final rolling temperature is 900-1000℃. Cold rolling, the deformation amount of cold rolling is 10%-40%. Solid solution treatment, cooling, and pickling to remove the oxide scale after shot blasting.

[0008] obtain a stainless steel substrate;

[0009] The composition of the stainless steel substrate is: in mass percentage, C: 0.01-0.03%, Si: 0.4-0.6%, Mn: 1.0-1.5%, Mo: 2.0-3.2%, N: 0.1-0.2%, Cr: 20-30%, Ni: 4.0-6.0%, P≤0.05%, S≤0.05%, rare earth element Ce: 0.02-0.06%, and the balance is Fe and inevitable trace element components;

[0010] Step 2: immerse the stainless steel substrate in a degreasing agent for 20-30 minutes, then wash with deionized water, and then immerse in an acid solution for acid activation, wherein the acid solution is a mixed solution of sulfuric acid and hydrochloric acid, the concentration of sulfuric acid is 2 mol / L, and the concentration of hydrochloric acid is 1 mol / L. After acid activation, the workpiece is ground in a 60-80 g / L silicon dioxide aqueous solution, and a nickel layer is formed on the surface by electroplating to obtain the hot-rolled plate.

[0011] When electroplating the surface, the specific steps are as follows:

[0012] Nanoscale diamond is used, and the particle size is controlled to be 3-5 nm. The nanodiamond powder is mixed with water to obtain a nanodiamond dispersion liquid for plating liquid after ultrasonic dispersion; then a basic nickel plating solution is prepared; different contents of nanodiamond dispersion liquid are added to the basic nickel plating solution under the action of mechanical stirring to obtain plating solutions A, B, and C.

[0013] Step S1: immerse the ground stainless steel substrate in plating solution A, control the current density to be 1A / dm 2 -2A / dm 2 , and electroplate for 30 min to form a nickel bottom layer on the surface of the stainless steel substrate, and then wash with deionized water; wherein the composition of plating solution A includes: boric acid 40-45 g / L, nickel bromide 20-30 g / L, saccharin 1-2 g / L, naphthalene sulfonic acid 1-2 g / L, and sodium dodecyl sulfate 0.05-0.1 g / L;

[0014] Step S2: immerse the stainless steel substrate treated in step S1 in plating solution B, control the current density to be 6A / dm 2 -9A / dm 2 , and electroplate for 30 min to form an intermediate layer, and then wash with deionized water; the composition of plating solution B includes: nickel sulfamate 470-500 g / L, boric acid 40-45 g / L, nickel chloride 20-30 g / L, sodium citrate 80-90 g / L, sodium saccharin 0.5-0.6 g / L, sodium chloride 35-50 g / L, sodium dodecyl sulfate 0.05-0.2 g / L, and nanodiamond 6-8 g / L;

[0015] Step S3: immerse the stainless steel substrate treated in step S2 in plating solution C, control the current density to be 6A / dm2 -9A / dm 2 The plating solution C comprises: sodium hydroxide 20-30 g / L, sodium silicate 10-15 g / L, trisodium phosphate 30-40 g / L, sodium carbonate 20-30 g / L, nickel sulfamate 470-500 g / L, boric acid 40-45 g / L, nickel chloride 10-15 g / L, sodium dodecyl sulfate 0.05-0.2 g / L, and nano-diamond 10-12 g / L.

[0016] Compared with the prior art, the application has the beneficial effects that:

[0017] The application discloses a kind of impact resistance stainless steel hot-rolled plate and manufacturing method thereof, rare earth element is added into basic stainless steel composition in the application, after a series of processes such as optimizing heat treatment, surface electroplating is formed to form electroplated nickel layer, and the required hot-rolled plate is obtained.The stainless steel hot-rolled plate prepared by the above scheme has good impact resistance and wear resistance.

[0018] 0.02-0.06% of rare earth element cerium is added to the basic component of stainless steel, and the rare earth element cerium promotes grain refinement, increases the grain boundary, and hinders the movement of dislocations.Because of grain refinement, the strength of duplex stainless steel is increased, and grain refinement can also improve the plasticity and toughness of steel.

[0019] The heating process is optimized, and the intermediate blank is heated in three heating furnaces with different parameters before being prepared, so that the edge cracking and other adverse reactions caused by rapid temperature drop during production are effectively reduced.

[0020] A multilayer nano-diamond composite coating is prepared by continuous electroplating method, the inner layer is not added with nano-diamond, the middle layer is added with 6-8 g / L of nano-diamond, and the outermost layer is added with 10-12 g / L of nano-diamond, forming a structure that is harder layer by layer, which is very beneficial to improve the surface wear resistance of the coating itself, and the impact resistance of the hot-rolled plate is also improved accordingly.The addition of nano-diamond significantly improves the hardness and wear resistance of the coating.The concentration of nano-diamond has a great influence on the hardness of the composite coating, and the hardness of the coating increases with the increase of the concentration of nano-diamond, and when the concentration of nano-diamond reaches 12 g / L, the hardness of the composite coating is greatly improved, because nano-diamond plays a dispersion strengthening role in the composite coating, and when the nickel matrix is subjected to load, nano-diamond can effectively enhance the mechanical properties of the composite nickel layer. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0022] In the embodiment, the components in the degreasing and oil removing agent are as follows in percentage by mass: sodium hydroxide 4%, edible baking soda 5%, sodium molybdate 4%, sodium carbonate 2%, sulfonated succinic acid dioctyl ester sodium 1%, hydrogen peroxide 3%, anhydrous ethanol 1.5%, phosphonocarboxylic acid 3%, and the balance of water.

[0023] Embodiment 1

[0024] The present example provides a kind of impact resistance stainless steel hot-rolled plate and its manufacturing method, the manufacturing method is as follows:

[0025] Step 1: smelt the molten steel of stainless steel raw material and cast into ingot, the ingot is placed in heating furnace for heating, and the heating parameters in the heating furnace are as follows: first, the temperature is raised to 800 DEG C, heated for 80 min, then the temperature is raised to 1000 DEG C, and kept for 60 min, the temperature is adjusted to 1040 DEG C, and kept for 90 min, then the temperature is raised to 1250 DEG C, and heated for 80 min, to obtain an intermediate blank. Hot rolling, 6 passes are rolled during hot rolling, the opening rolling temperature is 1100 DEG C, and the final rolling temperature is 900 DEG C, cold rolling, solution treatment, cooling, to obtain a stainless steel base plate; the deformation of cold rolling is 10%.

[0026] The mass percentage of the components of the stainless steel is as follows: C: 0.02%, Si: 0.60%, Mn: 1.15%, Mo: 3.15%, N: 0.18%, Cr: 22.50%, Ni: 5.55%, P≤0.05%, S≤0.03%, rare earth element Ce: 0.04%, and the balance is Fe and inevitable trace element components;

[0027] Step 2: the stainless steel base plate is soaked in the degreasing and oil removing agent for 20 minutes, then washed with deionized water, and then placed in a mixed acid solution with a sulfuric acid concentration of 2 mol / L and a hydrochloric acid concentration of 1 mol / L for acid activation. After acid activation, the workpiece is placed in a grinding liquid containing 60 g / L of silicon dioxide for grinding. A nickel plating layer is formed on the surface by electroplating to obtain the hot-rolled plate.

[0028] When electroplating the surface, the specific steps are as follows:

[0029] The nano-sized diamond is used, the particle size is controlled in 3-5nm, the nano diamond powder is mixed with water to form a mixed solution, and the nano diamond dispersion liquid for plating liquid is obtained after ultrasonic dispersion; then the base nickel plating solution is prepared; under the action of mechanical stirring, different contents of nano diamond dispersion liquid are added into the base nickel plating solution to obtain plating solutions A, B and C respectively.

[0030] Step S1: the ground stainless steel substrate is placed in plating solution A, the current density is controlled at 1A / dm 2 , the electroplating time is 30min, the nickel bottom layer is formed on the surface of the stainless steel substrate, and the deionized water is cleaned; the composition of plating solution A includes: boric acid 40g / L, nickel bromide 20g / L, saccharin 1g / L, naphthalene sulfonic acid 1g / L, and sodium dodecyl sulfate 0.1g / L.

[0031] Step S2: the stainless steel substrate treated in step S1 is placed in plating solution B, the current density is controlled at 6A / dm 2 , the electroplating time is 30min, the intermediate layer is formed, and the deionized water is cleaned; the composition of plating solution B includes: nickel sulfamate 470g / L, boric acid 40g / L, nickel chloride 20g / L, sodium citrate 80g / L, sodium saccharin 0.6g / L, sodium chloride 35g / L, and sodium dodecyl sulfate 0.1g / L.

[0032] Step S3: the stainless steel substrate treated in step S2 is placed in plating solution C, the current density is controlled at 6A / dm 2 , the electroplating time is 30min, the outer layer is formed, and the cleaning is obtained, thereby obtaining the hot-rolled plate. The composition of plating solution C includes: sodium hydroxide 20g / L, sodium silicate 10g / L, trisodium phosphate 30g / L, sodium carbonate 20g / L, nickel sulfamate 470g / L, boric acid 40g / L, nickel chloride 10g / L, sodium dodecyl sulfate 0.1g / L, and nano diamond 10g / L.

[0033] Example 2:

[0034] The present example provides a shock-resistant stainless steel hot-rolled plate and a manufacturing method thereof, the manufacturing method is:

[0035] Step 1: smelt the stainless steel raw material into molten steel and cast into ingot, and place the ingot in a heating furnace for heating, the heating parameters in the heating furnace are: first heat to 835℃, heat for 65min, then heat to 1100℃, keep for 45min, adjust the temperature to 1050℃, continue to keep for 60min, then heat to 1275℃, heat for 65min, and obtain an intermediate blank. Hot rolling, 6 passes of rolling are carried out during hot rolling, the opening rolling temperature is 1250℃, the final rolling temperature is 1000℃, cold rolling, solid solution treatment, cooling, and obtaining a stainless steel substrate; the deformation amount of cold rolling is 10%.

[0036] The stainless steel component has the mass percentage of C: 0.02%, Si: 0.60%, Mn: 1.15%, Mo: 3.15%, N: 0.18%, Cr: 22.50%, Ni: 5.55%, P≤0.05%, S≤0.03%, rare earth element Ce: 0.04%, and the balance of Fe and inevitable trace element components.

[0037] Step 2: The stainless steel substrate is soaked in a degreasing agent for 20 minutes, then washed with deionized water, and then subjected to acid activation in a mixed acid solution with a sulfuric acid concentration of 2 mol / L and a hydrochloric acid concentration of 1 mol / L. After the acid activation treatment, the workpiece is ground in a grinding liquid containing 60 g / L of silicon dioxide. The surface is electroplated to form a nickel plating layer, and the hot-rolled plate is obtained.

[0038] When electroplating the surface, the specific steps are as follows:

[0039] Nanoscale diamond is used, with a particle size controlled at 3-5 nm. The nanodiamond powder is mixed with water to obtain a nanodiamond dispersion liquid for the plating solution after ultrasonic dispersion. Then, a basic nickel plating solution is prepared. Different contents of the nanodiamond dispersion liquid are added to the basic nickel plating solution under the action of mechanical stirring to obtain plating solutions A, B, and C, respectively.

[0040] Step S1: The ground stainless steel substrate is placed in plating solution A, with the current density controlled at 1 A / dm 2 , and the electroplating time is 30 min. A nickel bottom layer is formed on the surface of the stainless steel substrate, which is then washed with deionized water. The composition of plating solution A includes boric acid 42 g / L, nickel bromide 24 g / L, saccharin 1.5 g / L, naphthalene sulfonic acid 1.5 g / L, and sodium dodecyl sulfate 0.1 g / L.

[0041] Step S2: The stainless steel substrate treated in step S1 is placed in plating solution B, with the current density controlled at 6 A / dm 2 , and the electroplating time is 30 min. An intermediate layer is formed, which is then washed with deionized water. The composition of plating solution B includes nickel sulfamate 480 g / L, boric acid 45 g / L, nickel chloride 25 g / L, sodium citrate 85 g / L, sodium saccharin 0.5 g / L, sodium chloride 35 g / L, sodium dodecyl sulfate 0.1 g / L, and nanodiamond 6 g / L.

[0042] Step S3: The stainless steel substrate treated in step S2 is placed in plating solution C, with the current density controlled at 6 A / dm 2, the plating time is 30 min, an outer layer is formed, and cleaning is performed to obtain the hot-rolled plate. The composition of plating solution C includes: sodium hydroxide 20 g / L, sodium silicate 10 g / L, trisodium phosphate 30 g / L, sodium carbonate 20 g / L, nickel sulfamate 470 g / L, boric acid 40 g / L, nickel chloride 10 g / L, sodium dodecyl sulfate 0.1 g / L, and nanodiamond 11 g / L.

[0043] Example 3

[0044] The present example provides a shock-resistant stainless steel hot-rolled plate and a manufacturing method thereof, the manufacturing method being:

[0045] Step 1: smelt the stainless steel raw material into molten steel and cast into an ingot, and place the ingot in a heating furnace for heating, the heating parameters in the heating furnace being: first heat to 850℃, heat for 50 min, then heat to 1200℃, keep for 35 min, adjust the temperature to 1100℃, continue to keep for 40 min, then heat to 1280℃, heat for 50 min, to obtain an intermediate blank. Hot-rolling, 6 passes of rolling are performed during hot-rolling, the opening rolling temperature is 1200℃, and the final rolling temperature is 950℃. Cold-rolling, solid solution treatment, cooling, to obtain a stainless steel base plate; the deformation amount of cold-rolling is 10%.

[0046] The mass percentage of the stainless steel composition is: C: 0.02%, Si: 0.60%, Mn: 1.15%, Mo: 3.15%, N: 0.18%, Cr: 22.50%, Ni: 5.55%, P≤0.05%, S≤0.03%, rare earth element Ce: 0.04%, and the balance being Fe and inevitable trace element components;

[0047] Step 2: soak the stainless steel base plate in a degreasing and oil removing agent for 20 min, then wash with deionized water, and then place it in a mixed acid solution with a sulfuric acid concentration of 2 mol / L and a hydrochloric acid concentration of 1 mol / L for acid activation. After acid activation, the workpiece is placed in a grinding liquid containing 60 g / L of silicon dioxide for grinding. Surface electroplating forms an electroplated nickel layer to obtain the hot-rolled plate.

[0048] When surface electroplating, the specific steps are:

[0049] Nanodiamonds with a particle size controlled at 3-5 nm are used, and a nanodiamond dispersion liquid for plating solution is obtained by dispersing nanodiamond powder in water after ultrasonic dispersion; then a basic nickel plating solution is prepared; different contents of nanodiamond dispersion liquid are added to the basic nickel plating solution under the action of mechanical stirring to obtain plating solutions A, B, and C, respectively.

[0050] Step S1: place the ground stainless steel base plate in plating solution A, control the current density at 1 A / dm 2, and the nickel bottom layer is formed on the surface of the stainless steel substrate by electroplating for 30 min, and then the stainless steel substrate is cleaned with deionized water; the plating solution A comprises 45 g / L of boric acid, 30 g / L of nickel bromide, 2 g / L of saccharin, 2 g / L of naphthalene sulfonic acid, and 0.1 g / L of sodium dodecyl sulfate.

[0051] Step S2: the stainless steel substrate treated in step S1 is placed in plating solution B, and the current density is controlled at 6 A / dm 2 , and the intermediate layer is formed by electroplating for 30 min, and then the stainless steel substrate is cleaned with deionized water; the plating solution B comprises 500 g / L of nickel sulfamate, 45 g / L of boric acid, 30 g / L of nickel chloride, 90 g / L of sodium citrate, 0.6 g / L of sodium saccharin, 35 g / L of sodium chloride, 0.2 g / L of sodium dodecyl sulfate, and 8 g / L of nanodiamond.

[0052] Step S3: the stainless steel substrate treated in step S2 is placed in plating solution C, and the current density is controlled at 6 A / dm 2 , and the outer layer is formed by electroplating for 30 min, and then the stainless steel substrate is cleaned to obtain the hot-rolled plate; the plating solution C comprises 30 g / L of sodium hydroxide, 15 g / L of sodium silicate, 40 g / L of trisodium phosphate, 20 g / L of sodium carbonate, 470 g / L of nickel sulfamate, 40 g / L of boric acid, 10 g / L of nickel chloride, 0.1 g / L of sodium dodecyl sulfate, and 12 g / L of nanodiamond.

[0053] Comparative Example 1: Comparative Example 1 is a control test of Experimental Example 3, and the plating solutions A and C are selected according to Experimental Example 3;

[0054] The present example provides a kind of impact resistance stainless steel hot-rolled plate and its manufacturing method, the manufacturing method is:

[0055] Step 1: smelt molten steel from stainless steel raw material and cast into ingot, the ingot is placed in heating furnace for heating, and the heating parameters in the heating furnace are: first heated to 850 DEG C, heated for 50 min, then heated to 1200 DEG C, kept for 35 min, adjusted to 1100 DEG C, continue to keep for 40 min, then heated to 1280 DEG C, heated for 50 min, to obtain intermediate blank. Hot rolling, 6 passes are rolled during hot rolling, the opening rolling temperature is 1200 DEG C, and the final rolling temperature is 950 DEG C, cold rolling, solution treatment, cooling, to obtain a stainless steel substrate; the deformation of cold rolling is 10%.

[0056] The mass percentage of the stainless steel composition is: C: 0.02%, Si: 0.60%, Mn: 1.15%, Mo: 3.15%, N: 0.18%, Cr: 22.50%, Ni: 5.55%, P≤0.05%, S≤0.03%, rare earth element Ce: 0.04%, and the balance is Fe and inevitable trace element composition;

[0057] Step 2: The stainless steel substrate is soaked in a degreasing agent for 20 minutes, then washed with deionized water, and then subjected to acid activation in a mixed acid solution with a sulfuric acid concentration of 2 mol / L and a hydrochloric acid concentration of 1 mol / L. After acid activation, the workpiece is ground in a grinding liquid containing 60 g / L of silicon dioxide. The surface is electroplated to form a nickel plating layer, and the hot-rolled plate is obtained.

[0058] When electroplating the surface, the specific steps are as follows:

[0059] Nanoscale diamond with a particle size controlled at 3-5 nm is used, and the nanodiamond powder is mixed with water to obtain a nanodiamond dispersion liquid for the plating solution after ultrasonic dispersion. Then, a basic nickel plating solution is prepared. Different contents of the nanodiamond dispersion liquid are added to the basic nickel plating solution under the action of mechanical stirring to obtain plating solutions A and C, respectively.

[0060] Step S1: The ground stainless steel substrate is placed in plating solution A, and the current density is controlled at 1 A / dm 2 . The electroplating time is 30 min, and a nickel base layer is formed on the surface of the stainless steel substrate. The plating solution A comprises boric acid 45 g / L, nickel bromide 30 g / L, saccharin 2 g / L, naphthalene sulfonic acid 2 g / L, and sodium dodecyl sulfate 0.1 g / L.

[0061] Step S2: The stainless steel substrate treated in step S1 is placed in plating solution C, and the current density is controlled at 6 A / dm 2 . The electroplating time is 1 h to form an outer layer, and the hot-rolled plate is obtained after cleaning. The plating solution C comprises sodium hydroxide 30 g / L, sodium silicate 15 g / L, trisodium phosphate 40 g / L, sodium carbonate 20 g / L, nickel sulfamate 470 g / L, boric acid 40 g / L, nickel chloride 10 g / L, sodium dodecyl sulfate 0.1 g / L, and nanodiamond 12 g / L.

[0062] Comparative Example 2: Comparative Example 2 is a control test of Experimental Example 3, and plating solutions B and C are selected for Experimental Example 3.

[0063] The present example provides a shock-resistant stainless steel hot-rolled plate and a manufacturing method thereof, and the manufacturing method is as follows:

[0064] Step 1: The stainless steel raw material is smelted into molten steel and cast into an ingot, which is heated in a heating furnace. The heating parameters in the heating furnace are as follows: first, the temperature is raised to 850°C and maintained for 50 min; then, the temperature is raised to 1200°C and maintained for 35 min; then, the temperature is adjusted to 1100°C and maintained for another 40 min; then, the temperature is raised to 1280°C and maintained for 50 min, to obtain an intermediate blank. Hot rolling is performed in 6 passes, with a starting rolling temperature of 1200°C and a final rolling temperature of 950°C. Cold rolling, solid solution treatment, and cooling are performed to obtain a stainless steel substrate. The deformation amount of cold rolling is 10%.

[0065] The stainless steel composition has the following mass percentages: C: 0.02%, Si: 0.60%, Mn: 1.15%, Mo: 3.15%, N: 0.18%, Cr: 22.50%, Ni: 5.55%, P≤0.05%, S≤0.03%, rare earth element Ce: 0.04%, and the balance of Fe and inevitable trace element components;

[0066] Step 2: The stainless steel substrate is soaked in a degreasing agent for 20 minutes, then washed with deionized water, and then subjected to acid activation in a mixed acid solution with a sulfuric acid concentration of 2 mol / L and a hydrochloric acid concentration of 1 mol / L. After the acid activation treatment, the workpiece is ground in a grinding liquid containing 60 g / L of silicon dioxide. The surface is electroplated to form a nickel plating layer, thereby obtaining the hot-rolled plate.

[0067] During the surface electroplating, the specific steps are as follows:

[0068] Nanoscale diamond is used, with a particle size controlled at 3-5 nm. The nanodiamond powder is mixed with water to obtain a nanodiamond dispersion liquid for the plating solution after ultrasonic dispersion. Then, a basic nickel plating solution is prepared. Different contents of the nanodiamond dispersion liquid are added to the basic nickel plating solution under the action of mechanical stirring to obtain plating solutions B and C.

[0069] Step S1: The stainless steel substrate is placed in plating solution B, with a current density controlled at 6 A / dm 2 , and electroplated for 30 minutes to form an intermediate layer, which is then washed with deionized water. The composition of plating solution B includes: nickel sulfamate 500 g / L, boric acid 45 g / L, nickel chloride 30 g / L, sodium citrate 90 g / L, sodium saccharin 0.6 g / L, sodium chloride 35 g / L, sodium dodecyl sulfate 0.2 g / L, and nanodiamond 8 g / L.

[0070] Step S2: The stainless steel substrate treated in step S1 is placed in plating solution C, with a current density controlled at 6 A / dm 2 , and electroplated for 30 minutes to form an outer layer, which is then washed to obtain the hot-rolled plate. The composition of plating solution C includes: sodium hydroxide 30 g / L, sodium silicate 15 g / L, trisodium phosphate 40 g / L, sodium carbonate 20 g / L, nickel sulfamate 470 g / L, boric acid 40 g / L, nickel chloride 10 g / L, sodium dodecyl sulfate 0.1 g / L, and nanodiamond 12 g / L.

[0071] Comparative Example 3: Comparative Example 3 is a control test of Experimental Example 3, and only plating solution B is selected in Comparative Example 3 of Experimental Example 3.

[0072] The present example provides a shock-resistant stainless steel hot-rolled plate and a manufacturing method thereof, and the manufacturing method is as follows:

[0073] Step 1: smelt the stainless steel raw material into molten steel and cast into ingot, and place the ingot in a heating furnace for heating, the heating parameters in the heating furnace are: first heat up to 850℃, heat for 50 min, then heat up to 1200℃, keep for 35 min, adjust the temperature to 1100℃, continue to keep for 40 min, then heat up to 1280℃, heat for 50 min, to obtain an intermediate blank. Hot rolling, 6 passes of rolling are carried out during hot rolling, the open rolling temperature is 1200℃, and the finish rolling temperature is 950℃, cold rolling, solution treatment, cooling, to obtain a stainless steel substrate; the deformation amount of cold rolling is 10%.

[0074] The mass percentage of the stainless steel composition is: C: 0.02%, Si: 0.60%, Mn: 1.15%, Mo: 3.15%, N: 0.18%, Cr: 22.50%, Ni: 5.55%, P≤0.05%, S≤0.03%, rare earth element Ce: 0.04%, and the balance is Fe and inevitable trace element composition;

[0075] Step 2: soak the stainless steel substrate in a degreasing and oil removing agent for 20 minutes, then wash with deionized water, and then place it in a mixed acid solution with a sulfuric acid concentration of 2 mol / L and a hydrochloric acid concentration of 1 mol / L for acid activation. After acid activation, the workpiece is placed in a grinding liquid containing 60g / L of silicon dioxide for grinding. Form a plated nickel layer on the surface by electroplating to obtain the hot-rolled plate.

[0076] The specific steps for surface electroplating are as follows:

[0077] Use nanoscale diamond with a particle size controlled at 3-5nm, mix the nanodiamond powder with water to obtain a nanodiamond dispersion liquid for plating liquid after ultrasonic dispersion; then prepare a basic nickel plating liquid; under the action of mechanical stirring, add the nanodiamond dispersion liquid to the basic nickel plating liquid to obtain plating liquid B.

[0078] Place the stainless steel substrate in plating liquid B, control the current density at 6A / dm 2 , and the electroplating time is 1h to form an outer layer, and then wash to obtain the hot-rolled plate. The composition of plating liquid C includes: sodium hydroxide 30g / L, sodium silicate 15g / L, trisodium phosphate 40g / L, sodium carbonate 20g / L, nickel sulfamate 470g / L, boric acid 40g / L, nickel chloride 10g / L, sodium dodecyl sulfate 0.1g / L, and nanodiamond 8g / L.

[0079] Detection test:

[0080] 1. Take the stainless steel hot-rolled plates prepared in Examples 1-3 and Comparative Examples 1-3, and detect the microhardness HV of the surface plating layer by a microhardness tester, the load is 25g, the loading time is 10s, 6 different positions are taken during testing, and the average value is measured.

[0081] 2. The stainless steel hot-rolled plate prepared in Examples 1-3 and Comparative Examples 1-3 is subjected to a plated layer friction and wear test, a GCr15 steel ball is selected as a friction pair, a load is 4N, the stainless steel hot-rolled plate is subjected to reciprocating motion, a sliding linear velocity is set to 0.065m / s, and a total sliding stroke of the stainless steel hot-rolled plate is 4m. A wear rate μm / Nm is measured.

[0082] Project Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Microhardness HV 576 579 581 579 577 572 Wear rate pm / Nm 0.43 0.41 0.35 0.45 0.44 0.47

[0083] In Experimental Examples 1-3, the heating process and the amount of added nanodiamonds are adjusted: in Experimental Example 1, the amount of nanodiamonds is set to 6g / L in plating solution B and 10g / L in plating solution C; in Experimental Example 2, the amount of nanodiamonds is set to 6g / L in plating solution B and 11g / L in plating solution C. In Experimental Example 3, the amount of nanodiamonds is set to 8g / L in plating solution B and 12g / L in plating solution C; the measured microhardness data shows an upward trend, and Experimental Example 3 has the best performance among the three examples;

[0084] Comparative Examples 1-3 are based on the plating solution in Example 3: in Comparative Example 1, the electroplating process selects plating solutions A and C for double-layer electroplating; in Comparative Example 2, the electroplating process selects plating solutions B and C for double-layer electroplating; and in Comparative Example 3, the electroplating process selects plating solution B for single-layer electroplating;

[0085] From the data of Examples 1-3 and Comparative Examples 1-3 above, based on the above experiments, the stainless steel hot-rolled plate prepared according to the scheme of Experimental Example 3 has excellent hardness and wear resistance, effectively improving the impact resistance of the stainless steel hot-rolled plate.

[0086] Conclusion: The present application discloses a kind of impact resistance stainless steel hot-rolled plate and manufacturing method thereof, scheme design is reasonable, each step parameter is suitable, and the impact resistance stainless steel hot-rolled plate prepared has not only excellent wear resistance and hardness, but also excellent impact resistance.

[0087] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the present application has been described in detail with reference to the foregoing examples, for those skilled in the art, the technical solutions recorded in the foregoing examples can still be modified, or some technical features can be replaced. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method of manufacturing an impact-resistant stainless steel hot-rolled sheet, characterized by, The manufacturing method is: Step 1: smelting a stainless steel raw material into molten steel and casting into an ingot, placing the ingot in a heating furnace for heating to obtain an intermediate blank, hot rolling, cold rolling, solution treatment, cooling to obtain a stainless steel substrate; 5-7 passes of rolling are performed during hot rolling, the rough rolling temperature is 1100-1250 DEG C, and the finish rolling temperature is 900-1000 DEG C; the deformation amount of cold rolling is 10%-40%; The composition of the stainless steel substrate is: by mass percentage, C: 0.01-0.03%, Si: 0.4-0.6%, Mn: 1.0-1.5%, Mo: 2.0-3.2%, N: 0.1-0.2%, Cr: 20-30%, Ni: 4.0-6.0%, P≤0.05%, S≤0.05%, rare earth element Ce: 0.02-0.06%, the balance being Fe and inevitable trace element components; Step 2: soaking the stainless steel substrate in a degreasing and oil removing agent for 20-30 minutes, then washing with deionized water, then placing it in an acid solution for acid activation, grinding, and surface electroplating to form an electroplated nickel layer to obtain the hot-rolled plate; In step 2, the specific steps for surface electroplating are: Step S1; the ground stainless steel substrate is placed in plating solution A, the current density is controlled at 1 A / dm 2 -2 A / dm 2 , the plating time is 30 min, a nickel underlayer is formed on the surface of the stainless steel substrate, and the stainless steel substrate is cleaned with deionized water; the composition of plating solution A comprises: boric acid 40-45 g / L, nickel bromide 20-30 g / L, saccharin 1-2 g / L, naphthalene sulfonic acid 1-2 g / L, and sodium dodecyl sulfate 0.05-0.1 g / L; Step S2: the stainless steel substrate treated in step S1 is placed in plating solution B, the current density is controlled at 6 A / dm 2 -9 A / dm 2 , the plating time is 30 min, and an intermediate layer is formed, and then the stainless steel substrate is cleaned with deionized water; the composition of plating solution B comprises: nickel sulfamate 470-500 g / L, boric acid 40-45 g / L, nickel chloride 20-30 g / L, sodium citrate 80-90 g / L, sodium saccharin 0.5-0.6 g / L, sodium chloride 35-50 g / L, sodium dodecyl sulfate 0.05-0.2 g / L, and nano-diamond 6-8 g / L; Step S3: the stainless steel substrate treated in step S2 is placed in plating solution C, the current density is controlled at 6 A / dm 2 -9 A / dm 2 , the plating time is 30 min, an outer layer is formed, it is cleaned, and it is naturally dried to obtain the hot-rolled plate; the composition of plating solution C comprises: sodium hydroxide 20-30 g / L, sodium silicate 10-15 g / L, trisodium phosphate 30-40 g / L, sodium carbonate 20-30 g / L, nickel sulfamate 470-500 g / L, boric acid 40-45 g / L, nickel chloride 10-15 g / L, sodium dodecyl sulfate 0.05-0.2 g / L, and nano-diamond 10-12 g / L.

2. The method of manufacturing a hot-rolled plate of impact-resistant stainless steel according to claim 1, characterized by, In step 1, the heating parameters in the heating furnace are: first heating to 800-850 DEG C, heating for 50-80 min, then heating to 1000-1200 DEG C, holding for 35-60 min, adjusting the temperature to 1040-1100 DEG C, continuing to hold for 40-90 min, then heating to 1250-1280 DEG C, heating for 50-80 min to obtain the intermediate blank.

3. The method of manufacturing a hot-rolled plate of impact-resistant stainless steel according to claim 1, characterized by, In step 2, the composition of the degreasing and oil removing agent is: by mass percentage, sodium hydroxide 2-4%, baking soda 3-7%, sodium molybdate 2-4%, sodium carbonate 1-3%, sulfonated dioctyl sodium succinate 1-3%, hydrogen peroxide 1-3%, anhydrous ethanol 0.5-1.5%, phosphonocarboxylic acid 2-4%, and the balance being water.

4. The method of manufacturing a hot-rolled plate of impact-resistant stainless steel according to claim 1, characterized by, In step 2, the acid solution is a mixed solution of sulfuric acid and hydrochloric acid, wherein the concentration of sulfuric acid is 2 mol / L and the concentration of hydrochloric acid is 1 mol / L.

5. The method of manufacturing an impact-resistant stainless steel hot-rolled sheet according to claim 1, characterized by, In step 1, the workpiece after acid activation is placed in a grinding liquid, and the grinding liquid is a silica aqueous solution with a concentration of 60-80 g / L.