4170 results about "Pickling" patented technology

The invention discloses a production process of a contact net anchorage steel wire rope. The production process comprises the following steps: carrying out surface acid cleaning and phosphating; drawing; carrying out lead bath heat treatment; galvanizing; drawing; detecting; entwisting; stranding; forging; and greasing. The production process has the advantages of convenience in operation and time-saving and labor-saving properties; and the produced contact net anchorage steel wire rope has the advantages of high breaking force, long fatigue service life, good abrasion resistance and good corrosion resistance.

The invention discloses enamel steel with scaling resistance. The enamel steel is prepared from the following components in percentage by weight: 0.0020-0.0050% of C, 0.30-0.50% of Mn, 0.0050-0.0100% of Si, 0.010-0.015% of P, 0.011-0.020% of S, 0-0.010% of Als, 0.011-0.020% of O and the balance of Fe and other inevitable impurities. A manufacturing method sequentially comprises the following steps: pretreatment of molten iron, smelting by a converter, refining, continuous casting, hot continuous rolling, acid washing, cold continuous rolling, annealing and finishing, wherein the heating temperature for hot continuous rolling is 1150-1250 DEG C, the finish rolling temperature is 860-920 DEG C, the winding temperature is 650-750 DEG C, and the cold rolling reduction rate of cold continuous rolling is 60-80%. The enamel steel disclosed by the invention has no scaling phenomenon and low production difficulty, and is suitable for being applied to the technical field of iron and steel smelting.

The invention discloses a preparing method of electrostatic enamel hot-roller fine-grained steel, which is characterized by the following: allocating mass percent as 0. 02-0. 10 carbon, not more than 0. 10 silicon, 0. 4-1. 0 manganese, not more than 0. 05 phosphor, 0. 02-0. 05 sulfur, 0. 01-0. 10 aluminum, 0. 003-0. 010 nitrogen, 0. 03-0. 10 titanium, surplus ferric and unavoidable impurity; setting the content of TiN at 0. 013-0. 044; setting ferrite tissue grain fineness number not less than 10 grade. This invention possesses good enamel adherence property and against squama knock property.

The invention relates to a method for producing color-coated steel sheet for a structure. The method comprises the following steps of: smelting, namely desulfurizing by molten iron, smelting by a converter, casting continuously to form a blank and performing hot rolling; performing acid washing; performing cold milling; annealing continuously; performing hot dipping on aluminum and zinc; and polishing, straightening, performing color coating and packaging for later use. In the method, the yield strength RP 0.2 (or ReH) is between 550 and 600 MPa; the tensile strength Rm is between 560 and 610MPa; and the percentage elongation after break A80 mm is more than or equal to 6 percent. A neutral salt mist test is performed for 1,200 hours, a coating does not have bubbling and corrosion phenomena. At present, the annealed color-coated plate of which the metallographic structure is ferrite and pearlite or the ferrite and free cementite or the ferrite and the pearlite and less free cementite cannot achieve the effect, and the production cost can be reduced by 10 to 15 percent. By the method, special occasions which have high-yield strength and are used for cooling chambers of automobiles,arch coverings and the like can be met, and a process is simple and easy to implement.

The invention relates to a recovery and comprehensive utilization method of heavy metals in stainless steel pickling wastewater sludge and discloses a method for recovering and recycling nickel and chrome in sludge generated during the treatment process of stainless wastewater. The method comprises the following steps: leading waste liquid during the pickling process to be directly used for leaching metal ions in the sludge to save the consumption of reagents; adding a certain quantity of acid or alkali in each reaction tank through arranging a plurality of reaction tanks; controlling a pH value; effectively separating various matters according to different solubility of inorganic compounds; researching and developing a recycling technology of the heavy metals in the stainless steel industrial sludge, wherein the recovery efficiency of the heavy metals like the chrome and the nickel is high; leading the recovered heavy metals to be used for smelting stainless steel; leading recovered iron to be used for preparing an efficient flocculating agent; and leading the flocculating agent to be used for sewage treatment to realize sewage reuse and save the treatment cost. The invention has the advantages of simple process and easy operation, as well as popularization and application.

The invention relates to a stainless steel seamless pipe in metallurgical industry and the manufacturing process for the stainless steel seamless pipe; wherein, the steel pipe is made of 00Cr24Ni6Mo2N dual phase stainless steel; the manufacturing process for preparing the ship borne stainless steel seamless pipe comprises the following production steps of a. round steel preparation; b. heating; c. hot-puncturing process; d. end cropping; e. pickling; f. repair grinding; g. lubrication; h. cold rolling processing; i. degreasing; j. solution heat treatment; k. straightening; l. pipe cutting; m. pickling; n. inspection of finished products. The invention solves the problems of lower mechanical strength and extensibility, shorter service life and high prices in present 316L stainless steel pipes used in ship seawater channels and provides a novel ship borne dual phase stainless steel seamless pipe and the manufacturing process and has the advantages of no production of pitting corrosion and grain boundary corrosion of the steel pipes, higher mechanical strength and extensibility, longer service life as well as low price and low cost.

The invention discloses an austenitic stainless steel and a manufacturing method thereof. The weight percentages of the chemical components of the stainless steel are as follows: C, less than or equal to 0.03 percent; Si, 0.3 to 0.9 percent; Mn, 0.6 to 1.5 percent; Cr, 16.0 to 18.0 percent; Ni, 5.5 to 7.5 percent; N, 0.1 to 0.25 percent; P, less than or equal to 0.040 percent; S, less than or equal to 0.03 percent; the rest, Fe and inevitable impurity elements; wherein, the numerical value of Md30 is 20 to 60. The manufacturing method of the stainless steel is as follows: 1) preparation of ingots or slabs; 2) hot rolling; 3) annealing and acid pickling; 4) cold rolling with the reduction no less than 50 percent; 5) heat treatment and acid pickling. The method can lead the material elongation reach above 25 percent and improve the corrosion resistance of high-strength austenitic stainless steel used in vehicles and the processing and manufacture performance of steel.

The invention discloses an austenitic stainless steel with excellent polishing performance. The austenitic stainless steel comprises the following chemical components in percentage by weight: 16 to 20 percent of Cr, 7 to 15 percent of Ni, less than or equal to 2 percent of Mn, 0.2 to 2 percent of Cu, less than or equal to 0.05 percent of Al, less than or equal to 0.5 percent of Si, 0.03 to 0.1 percent of C, less than or equal to 0.05 percent of N, 0.01 to 0.06 percent of P, 0.003 to 0.05 percent of S, 0.05 to 0.5 percent of V, and the balance of iron and inevitable impurities. A manufacturing method for an austenitic stainless steel cold-rolled plate comprises the following steps of: heating a continuous cast plate blank to the temperature of between 1,100 and 1,300 DEG C; performing rough rolling at the temperature of between 1,000 and 1,250 DEG C; performing final rolling at the temperature of between 950 and 1,100 DEG C; performing quick cooling; coiling at the temperature of less than 700 DEG C; performing hot rolling to form a hot-rolled plate of the required specification; annealing the hot-rolled plate at the temperature of between 950 and 1,200 DEG C; removing oxide skin by adopting a continuous acid washing process of phosphorus breakage, shot blasting, electrolysis and mixed acid washing; performing cold rolling, wherein the overall reduction rate is more than 50 percent; and performing continuous annealing at the temperature of between 950 and 1,200 DEG C, or performing full-hydrogen bright annealing at the temperature of between 950 and 1,200 DEG C. The austenitic stainless steel cold-rolled plate has completely improved grinding performance and surface polishing performance, and is particularly suitable for the industries of building decoration, plastic dies, food sanitation, electronics and the like with strict polishing performance requirements.

The invention discloses a high-strength high-plasticity cold-rolled steel plate for automobiles and a production method thereof. The high-strength high-plasticity cold-rolled steel plate comprises, by weight, 0.25-0.35% of C, 0.8-1.2% of Si, 2.0-2.5% of Mn, less than or equal to 0.02% of P, less than or equal to 0.005% of S, 0.5-1.0% of Al, 0.001-0.002% of B and the balance Fe and unavoidable impurities. The production method comprises smelting, continuous casting, hot rolling, pickling, cold rolling and continuous annealing. A continuous annealing heating temperature is in a range of 800-850 DEG C, thermal insulation time is in a range of 150-180s, a cooling rate is greater than or equal to 50 DEG C/s, a quenching temperature is in a range of 250-280 DEG C, a partition temperature is in a range of 350-400 DEG C, partition time is in a range of 300-600s and after partition, the product is cooled to a room temperature at a cooling rate greater than or equal to 50 DEG C/s.

The invention provides an AlN ceramic bonded copper substrate which comprises an AlN ceramic substrate and copper foil bonded and connected onto the AlN ceramic substrate and is characterized in that a spinel structure compound modification layer is formed between the AlN ceramic substrate and the copper foil and comprises one or two of CuAlO2, CuAl2O4, Cu2O and CuO. The invention further provides a preparation method of the AlN ceramic bonded copper substrate. The method comprises the steps of spraying nano Cu2O on the surface of the AlN substrate, sintering in inert gas with a micro oxygen content and air sequentially, and then removing a surface oxide by a pickling manner. The prepared modification layer is tightly combined with matrix ceramic, and also has good affinity characteristic with the Cu foil. A uniform oxidation layer can be formed on the surface of the Cu foil by putting the Cu foil in a prepared solution at a certain temperature for specified time and more facilitates an AlN-DBC (direct bonded copper) technology.

The invention relates to a non-oriented high-silicon electrical steel ribbon and its making method, and belongs to the fields of the metallurgical technology and the material science. The chemical components of the ribbon comprise 4.5-7.0wt% of Si, 2.0-5.0wt% of Cr, 0.06-1.0wt% of Al, 0.3-0.8wt% of Mn, 0.005wt% or less of N, 0.004wt% or less of S, 0.02wt% or less of P, 0.003wt% or less of O, 0.005wt% or less of C, and the balance Fe, and the thickness of the ribbon is 0.35-0.5mm. The making method comprises the following steps: smelting non-oriented high-silicon steel in a vacuum smelting furnace; carrying out double-roller ribbon roll-casting at a casting temperature of 1420-1460DEG C to the ribbon thickness of 1.0-1.5mm; carrying out hot rolling of the ribbon at 800-1100DEG C to the hot rolled ribbon thickness of 0.8-1.0mm; pickling, and preheating the ribbon, and carrying out warm rolling at 400-700DEG C; and annealing. The addition of the Cr element in the high-silicon electrical steel ribbon obviously improves the processing performance of the high-silicon steel ribbon, the iron loss value is same to the iron losses of present high-silicon steel products, and the magnetic induction intensity is above 0.03T higher than that of the present products. The making method has the advantages of simple technology, low energy consumption, high yield, and excellent product magnetic property.

A pickling passivation method of stainless steel is characterized in that the method comprises the following steps of: (1) oil removing; (2) first rinsing; (3) pickling passivation, wherein a specially-prepared pickling passivating solution is proportioned by 20% of nitric acid, 10% of hydrofluoric acid, and 70% of purified water, and the workpiece is soaked in groove liquid completely; (4) second rinsing; (5) meutralization by alkali liquor, wherein the workpiece is soaked in an alkaline groove liquid completely; (6) first water washing; (7) third rinsing; (8) air drying; (9) stoving; (10) confining liquid spraying; (11) natural air drying; (12) packaging with air-cushion films. The invention combines two original steps of pickling and passivation into one step, which effectively increases the corrosion resistance of the stainless steel, improves the hand fingerprint contamination resistance of the stainless steel, ensures the surface decoration performance of the stainless steel products, and the method has the characteristics of simple process, low production cost, less environment pollution, easy operation, low labor intensity, low energy consumption, and high efficiency.

The invention discloses a method for treating stainless steel pickling waste liquor and recovering iron, chromium and nickel. According to the method, a sodium hydroxide solution is adopted to control the pH of the stainless steel pickling waste liquor to achieve the purpose of recovery of iron, chromium and nickel through fractional precipitation. Because pH ranges of deposition of the iron, chromium and nickel elements are overlapped, part of iron oxide-hydroxide is precipitated firstly in a separation and recovery process, residual iron and chromium elements are co-precipitated out, and then chromium is precipitated and dissolved under the strong alkaline condition to realize final separation of iron and chromium. Due to presence of ammonia water and a reducing agent, the nickel element exists in the form of ions or a nickel ammine complex, is dissolved in the waste liquor, and finally reacts with a sulfide to precipitate NiS. The method has the characteristics of low cost, easiness in control, high separation and recovery rate of the iron, chromium and nickel elements and the like. The method can treat the stainless steel pickling waste liquor effectively, and the natural environment cannot be polluted after emission; the recovered metal elements have the recycling economic benefits, and the method has high application value and important technological innovation meaning.

The invention discloses a hot galvanizing steel plate with yield strength more than or equal to 550MPa, and a manufacturing method of the hot galvanizing steel plate; the hot galvanizing steel plate with the yield strength more than or equal to 550MPa comprises the following components by mass percent: 0.05-0.12% of C, less than or equal to 0.08% of Si, 0.3-0.9% of Mn, 0.020-0.060% of Als, less than or equal to 0.03% of P, less than or equal to 0.03% of S and the balance of Fe and unavoidable impurities; the manufacturing method of the hot galvanizing steel plate with the yield strength more than or equal to 550MPa comprises the steps of cast steel plate (CSP) continuous casting and rolling, steel plate pickling cold rolling and steel plate continuous zinc coating; according to the invention, the chemical components of the hot galvanizing steel plate are designed in an optimal way, alloying elements with high price are not added into the hot galvanizing steel plate, the strength of products can be improved by structure strengthening and solution strengthening of C and Mn, and the production cost is greatly reduced; the grain size is reduced, and the product strength is improved by reducing the CSP rolling temperature; the product strength is improved by controlling the acid rolling reduction rate; and the yield strength of the products can be guaranteed by controlling the galvanized annealing temperature and speed as well as the hydrogen content.

The invention relates to a cold rolled tin-plated steel plate for multiple printing and painting and a manufacturing method thereof, and aims to solve the technical problems that in the prior art, the coating on the conventional cold rolled tin-plated steel plates for multiple printing and painting can be easily peeled off, the adhesive force between the coating and the steel plate is weak, and the color developing effect is bad after printing. The manufacturing method comprises the following steps: washing a hot-rolled hard tin-plated steel plate with a thickness of 1.8 to 2.3 mm by acid, performing continuous cold rolling, carrying out continuous annealing, flattening, electroplating tin on the steel plate, passivating the steel plate, and finally rolling the steel plate to obtain a finished product; wherein the cold rolling reduction ratio is 85 to 90%, the annealing temperature is 550 to 620 DEG C, the temperature is maintained for 60 to 120 seconds, the steel plate is flattened by two machines, the work roller of the first machine is an electro-discharge texturing roller with a Ra of 1.2 to 1.6 um, the rolling force is 500 to 700 t; the work roller of the second machine is a grinding roller with a Ra of 0.3 to 0.5 um, the rolling force is 250 to 350 t; the flattening elongation rate is 1 to 2%, and the passivation is carried out through an electrochemical method and a chemical method. The provided steel plate is mainly used to produce food/beverage cans, which have requirements on multi-color printing.