Silver bright steel bar for internal combustion engine valve and production method of silver bright steel bar

Abstract

The invention provides a production method of a silver bright steel bar for an internal combustion engine valve. The production method comprises the following operation steps that S1, raw materials are prepared into molten steel, S2, die casting is conducted, specifically, the molten steel is poured into a steel ingot die to prepare a blank, and S3, electroslag remelting is conducted, specifically, an electroslag base material blank produced through die casting is welded to a fake electrode. According to the silver bright steel bar for the internal combustion engine valve and the production method of the silver bright steel bar, 40Kg of small electroslag steel ingots are replaced by electroslag remelting, so that the consistency of chemical components of the silver bright steel bar is more stable, the production efficiency is improved, and the energy consumption and the production cost of smelting and electroslag procedures are reduced; the high-speed wire rolling wire rod with temperature control, rolling control and cooling control is achieved, off-line solution treatment is adopted, uncoiling straightening and grinding machining are conducted after the wire rod is subjected to solution treatment, eddy current flaw detection and ultrasonic flaw detection are conducted on the ground silver bright bar, and therefore the production cost is reduced, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of silver bright steel rod production, in particular to a silver bright steel rod for internal combustion engine valves and a production method thereof. BACKGROUND

[0002] The silver bright steel rod 61Cr21Mn10Mo1V1Nb1N for internal combustion engine valves is a Cr-Mn-N austenitic valve steel without nickel, which is included in the national standard GB / T12773-2021 Steel and Alloy Bars for Internal Combustion Engine Valves. The steel contains the following components by weight: C: 0.57-0.65%; Si≤0.25%; Mn: 7.00-10.00%; P: ≤0.050%; S≤0.030%; Cr: 20.00-22.00%; Ni≤1.50%; Mo: 0.75-1.25%; N: 0.40-0.60%; V: 0.75-1.00%; Nb: 1.00-1.20%; Cu: ≤0.30%; the balance is Fe and unavoidable impurities. The 61Cr21Mn10Mo1V1Nb1N can obtain high high-temperature strength through strict cooperation of alloy elements Mo, V and Nb after solid solution treatment and aging. The steel has relatively high yield strength and tensile strength at 800℃, and the elongation and reduction of area are still higher than those of another austenitic valve steel 53Cr21Mn9Ni4N steel. The 61Cr21Mn10Mo1V1Nb1N also has good PbO corrosion resistance, and long-term engine installation use also proves its good corrosion resistance. The main body is used as a steel for diesel engine exhaust valves.

[0003] The current silver bright steel rod 61Cr21Mn10Mo1V1Nb1N for internal combustion engine valves has the process of 40Kg small electroslag ingot, forging breakdown to 55 square, rolling small coil, solid solution treatment, straightening, grinding and non-destructive testing. The produced product has poor quality stability and extremely low production efficiency.

[0004] Therefore, it is necessary to provide a silver bright steel rod for internal combustion engine valves and a production method thereof to solve the above technical problems. SUMMARY

[0005] The present application provides a silver bright steel rod for internal combustion engine valves and a production method thereof, which solves the problems of the current silver bright steel rod production process for internal combustion engine valves, poor product quality stability and extremely low production efficiency.

[0006] To solve the above technical problems, the present application provides a production method of a silver bright steel rod for internal combustion engine valves, which includes the following operation steps:

[0007] S1: preparing raw materials into steel liquid;

[0008] S2: Molding: preparing the billet by pouring the liquid steel into the ingot mold;

[0009] S3: Electroslag Remelting: welding the electroslag mother material billet produced by the molding with the dummy electrode, and obtaining the electroslag ingot with the weight of 1 ton after the electroslag remelting;

[0010] S4: Rolling Breakdown: two-fire heating rolling breakdown, the first fire heating temperature is 1200°C, and the holding time is 180 minutes; the second fire heating temperature is 1200°C, and the holding time is 60 minutes, the square billet is air-cooled, and is rolled;

[0011] S5: High-speed Wire Rolling: heating the rough rolling square billet in the walking beam furnace, and then rolling the rough rolling square billet through a plurality of passes of rolling deformation of primary rolling, intermediate rolling, pre-precision rolling, precision rolling and reducing diameter, to the final wire rod specification Φ13.1mm, and then collecting the wire rod after air cooling, and transferring the wire rod to the heat treatment process;

[0012] S6: Solid Solution Treatment: heating the rolled piece to 1075±4°C through the box-type electric furnace, and holding the rolled piece for 2 hours, and then directly discharging the furnace for water cooling after the holding ends;

[0013] S7: Straightening: straightening the wire rod after the wire rod is dried after the coating of the ash, to obtain the straight bar with the straightness of ≤1mm / m and the fixed length of 4m;

[0014] S8: Grinding: grinding the straightened round bar with the diameter of Φ13.1mm through the grinding machine to obtain the ground bar;

[0015] S9: Nondestructive Testing: nondestructively testing the ground bar through the testing device to obtain the qualified silver bright bar with the diameter of Φ12.5mm, and storing the product in the warehouse after the product is qualified.

[0016] Preferably, the slag in the electroslag remelting in step 3 is selected as CaF2:Al2O3:MgO=70%:25%:5%, the remelting current is 6300A, the voltage is 44V, and the remelting time is 240 minutes.

[0017] Preferably, the heating temperature of the rough rolling square billet in step 5 is divided into: a preheating section: ≤800°C, a first heating section: 990-1120°C, a second heating section: 1140-1190°C, a soaking section: 1170-1190°C, and a rolling temperature: 1170-1190°C, and the Φ85 round before the 7-arch rolling mill is inductively heated to 1120°C.

[0018] Preferably, the round bar is ground to the ground bar with the diameter of Φ12.50mm and the surface roughness Ra≤1.6um through the grinding machine in step 10.

[0019] Preferably, the detection device comprises a discharging device, the discharging device comprises a discharge port, a baffle, a moving frame and two first telescopic pieces, the discharge port is arranged in the inside of the detection device, the baffle is slidably connected to the inside of the detection device, the bottom of the moving frame is fixedly connected to the bottom of the baffle, and one side of the two first telescopic pieces is fixedly installed on the two sides of the detection device.

[0020] Preferably, the first telescopic piece is a hydraulic rod, one side of the hydraulic rod is fixedly installed on one side of the detection device, and the output end is fixedly installed on one end of the moving frame.

[0021] Preferably, the inside of the detection device is provided with a storage device, the storage device comprises a rotating rod, a supporting plate, two moving grooves, two moving blocks, two moving rods, two sliding sleeves, a moving plate and two second telescopic pieces, the rotating rod is rotatably connected to the inside of the detection device, one end of the supporting plate is fixedly connected to the surface of the rotating rod, the two moving grooves are arranged in the inside of the supporting plate, the two moving blocks are slidably connected to the inside of the two moving grooves respectively, one end of the two moving rods is rotatably connected to the bottom of the two moving blocks respectively, the two sliding sleeves are fixedly connected to the inside of the detection device, one side of the moving plate is fixedly connected to one end of the moving rod, and the two second telescopic pieces are fixedly installed on the two sides of the detection device.

[0022] Preferably, the inside of the supporting plate is slidably connected with two pressing blocks, the inside of the detection device is provided with a fixing device, the fixing device comprises a fixing groove and a fixing plate, the fixing groove is arranged in the inside of the detection device, and the fixing plate is slidably connected to the inside of the fixing groove.

[0023] Preferably, the inside of the supporting plate is provided with a reset device, the reset device comprises a reset groove, a reset plate and a plurality of reset pieces, the reset groove is arranged in the inside of the supporting plate, the reset plate is slidably connected to the inside of the reset groove, and the plurality of reset pieces are arranged in the inside of the reset groove.

[0024] A silver bright steel rod for internal combustion engine valves, a silver bright steel rod for internal combustion engine valves produced by the production method, comprising the following components: C: 0.61, Si: 0.21, Mn: 10.37, P: 0.027, S: 0.006, Cr: 20.63, Ni: 0.63, Mo: 0.85, N: 0.51, V: 0.87, Nb: 1.15, and Cu: 0.08.

[0025] Compared with the related art, the silver bright steel rod for internal combustion engine valves and the production method have the following beneficial effects:

[0026] The present application provides a silver bright steel rod for internal combustion engine valves and a production method thereof, by replacing the 40Kg small electroslag ingot with electroslag remelting, the consistency of the chemical composition is more stable, the production efficiency is improved, the smelting and electroslag processes can reduce energy consumption and production cost, at the same time, the high-speed wire rolling process is adopted to realize the high-speed wire rolling wire rod with temperature control, rolling control and cooling control, the offline solid solution treatment is adopted, the wire rod is subjected to solid solution treatment, then is subjected to uncoiling and straightening, grinding processing, and the silver bright rod after grinding is subjected to eddy current flaw detection and ultrasonic flaw detection, so that the production cost is reduced and the production efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 FIG. 1 is a structural schematic diagram of a first embodiment of a silver bright steel rod for internal combustion engine valves and a production method thereof provided by the present application;

[0028] Figure 2 FIG. 2 is a structural schematic diagram of a second embodiment of a silver bright steel rod for internal combustion engine valves and a production method thereof provided by the present application;

[0029] Figure 3 FIG. 3 is a structural schematic diagram of a third embodiment of a silver bright steel rod for internal combustion engine valves and a production method thereof provided by the present application;

[0030] Figure 4 FIG. 4 is an enlarged schematic view of part A shown in FIG. 3. Figure 3

[0031] Reference numerals in the figure: 1, detection device, 2, blanking device, 21, discharge port, 22, baffle, 23, moving frame, 24, first telescopic member, 3, storage device, 31, rotating rod, 32, support plate, 33, moving groove, 34, moving block, 35, moving rod, 36, sliding sleeve, 37, moving plate, 38, second telescopic member, 4, fixing device, 41, fixing groove, 42, fixing plate, 5, reset device, 51, reset groove, 52, reset plate, 53, reset member, 6, extrusion block. DETAILED DESCRIPTION

[0032] The present application will be further described below in combination with the drawings and embodiments.

[0033] First embodiment

[0034] Please refer to Figure 1 , wherein, Figure 1 FIG. 1 is a structural schematic diagram of a first embodiment of a silver bright steel rod for internal combustion engine valves and a production method thereof provided by the present application. The production method of a silver bright steel rod for internal combustion engine valves comprises the following operation steps:

[0035] S1: preparing raw materials into steel liquid;

[0036] ​S2: Molding: preparing the billet by pouring the liquid steel into the ingot mold;

[0037] S3: Electroslag Remelting: welding the electroslag parent material billet produced by the molding with the dummy electrode, and after electroslag remelting, obtaining the electroslag ingot with a weight of 1 ton;

[0038] S4: Rolling Breakdown: two-fire heating rolling breakdown, the first fire heating holding temperature is 1200℃, holding time is 180 minutes; the second fire heating holding temperature is 1200℃, holding time is 60 minutes, the square billet is air-cooled, and is rolled;

[0039] S5: High-speed Wire Rolling: heating the rough rolling square billet in the walking beam furnace, and then rolling deformation through a plurality of passes such as one intermediate rolling, two intermediate rolling, three intermediate rolling, pre-precision rolling, precision rolling and reducing sizing, and rolling to the final wire rod specification Φ13.1mm, and after wire drawing, air cooling is used for collection, and the hot treatment process is entered;

[0040] S6: Solid Solution Treatment: heating to 1075±4℃ by the box-type electric furnace, and then holding the rolled piece for 2 hours, and after the holding is completed, directly discharging water cooling;

[0041] S7: Straightening: after the wire rod is coated with ash and dried, the wire rod is straightened into a rod, and a straight rod with a straightness ≤1mm / m and a fixed length of 4m is obtained;

[0042] S8: Grinding: the straightened round rod with a diameter of Φ13.1mm is processed through a plurality of passes of grinding by a grinding machine to obtain a ground rod;

[0043] S9: Non-destructive Testing: the ground rod is subjected to non-destructive testing by a detection device 1, and a qualified Φ12.5mm silver bright rod is obtained, and the product is stored after being qualified.

[0044] When the liquid steel is prepared, an electric furnace, an AOD furnace smelting and an LF furnace smelting are used.

[0045] The sampling temperature of the electric furnace is T=1560±20℃, and the tapping temperature is T=1620±20℃.

[0046] The AOD furnace smelting blows Ar in the early stage and blows N2 in the later stage, controls the N charging temperature, and after reduction, the slag is removed by >80%(as much as possible, the still state in the furnace can expose the molten steel); electrolytic manganese and ferrosilicon cannot be added together, pre-reduction is used first, and then manganese is added, and the ferrosilicon used for pre-reduction must be baked before use; control the N charging temperature, and avoid adding chromium nitride in the LF furnace.

[0047] The LF furnace smelting adjusts the alloy composition and raises the temperature for refining, and the materials used in the LF must be baked(stone fluorite, chromium iron, ferrosilicon, etc.); any alloy is not allowed to be added 30 minutes before the ladle is lifted; white slag must be maintained for ≥30 minutes before sampling;

[0048] S≤0.005% other chemical ingredients into the control; soft blowing Ar≥15 minutes, the size of the flow to not bare steel liquid; hanging bag temperature: 1470~1480℃.

[0049] 3 blow 1 guarantee the inside of the ingot mold, the ingot mold clean when die casting; 3~8 minutes before casting, install argon protection device, open argon, argon flow 0.20~0.25MPa; after pouring, the remaining steel in the ladle control≥700kg, add drainage note to ensure≥850kg.

[0050] The slag material selection in the step 3: CaF2: Al2O3: MgO = 70%: 25%: 5%, remelting current 6300A, voltage 44V, remelting time 240 minutes.

[0051] The heating temperature of the billet in the step 5 is divided into: preheating section: ≤800℃, heating section 1: 990~1120℃, heating section 2: 1140~1190℃, soaking section: 1170~1190℃, opening rolling temperature: 1170~1190℃, before 7 rolling mill, Φ85 circle adopts induction heating to 1120℃.

[0052] The round bar is processed into a polished bar material with a diameter of Φ12.50mm and a surface roughness Ra≤1.6um by a grinding machine in the step 10.

[0053] The detection device 1 includes a blanking device 2, the blanking device 2 includes a discharge port 21, a baffle 22, a moving frame 23 and two first telescopic pieces 24, the discharge port 21 is opened in the inside of the detection device 1, the baffle 22 is slidingly connected in the inside of the detection device 1, the bottom of the moving frame 23 is fixedly connected to the bottom of the baffle 22, and the two first telescopic pieces 24 are fixedly installed on the two sides of the detection device 1.

[0054] The detection device 1 is the existing technology of eddy current flaw detection + ultrasonic flaw detection, and the output end of the detection device 1 is further provided with a sorting device for separately storing the qualified and unqualified steel bars, and the blanking device 2 is arranged in the inside of the sorting device.

[0055] The first telescopic piece 24 is a hydraulic rod, one side of the hydraulic rod is fixedly installed on one side of the detection device 1, and the output end is fixedly installed on one end of the moving frame 23.

[0056] The first telescopic piece 24 is a gas cylinder or an electric push rod, which is used to drive the moving frame 23 to move after being started.

[0057] In use, the first telescopic part 24 is started to drive the moving frame 23 and the baffle 22 to move downwards, and when the baffle 22 moves to the appropriate position, the steel rod in the detection device 1 is discharged through the discharge port 21.

[0058] When the discharging is completed, the first telescopic part 24 is started to drive the moving frame 23 and the baffle 22 to move upwards to reset, so as to seal the discharge port 21.

[0059] The working principle of the silver bright steel rod for internal combustion engine valves and the production method thereof is as follows:

[0060] In use:

[0061] S1: preparing raw materials into steel liquid;

[0062] S2: mold casting: preparing into billets by pouring the steel liquid into the ingot mold;

[0063] S3: electroslag remelting: welding the electroslag mother material billets produced by mold casting with the dummy electrode to perform electroslag remelting;

[0064] S4: roughing rolling: roughing rolling by two-fire heating, the first fire heating temperature is 1200 DEG C, the holding time is 180 minutes; the second fire heating temperature is 1200 DEG C, the holding time is 60 minutes, the square billet is air-cooled, and the rolling is performed;

[0065] S5: high-speed wire rolling: heating the roughed square billet in the step-by-step heating furnace, and then performing multi-pass rolling deformation through one intermediate rolling, two intermediate rolling, three intermediate rolling, pre-precision rolling, precision rolling and reducing diameter, and rolling to the final wire rod specification Φ13.1mm, and then collecting after air cooling, and transferring to the heat treatment process;

[0066] S6: solid solution treatment: heating to 1075±4 DEG C by the box-type electric furnace, and then holding the rolled piece for 2 hours, and then directly discharging water cooling after the holding is completed;

[0067] S7: straightening: after the wire rod coating is dried, the wire rod is straightened to obtain a straight rod material with a straightness of ≤1mm / m and a fixed length of 4m;

[0068] S8: grinding: grinding the straightened round rod with a diameter of Φ13.1mm through the grinding machine to obtain a polished rod material;

[0069] S9: nondestructive testing: the polished rod material is subjected to nondestructive testing by the detection device 1 to obtain a qualified Φ12.5mm silver bright rod material, and the product is stored in the warehouse after being qualified.

[0070] Compared with the related art, the silver bright steel rod for internal combustion engine valves and the production method thereof have the following beneficial effects:

[0071] The application provides a silver bright steel rod for an internal combustion engine valve and a production method thereof, through electric-shock remelting instead of 40Kg small electric-shock steel ingots, the consistency of the chemical composition is more stable, the production efficiency is improved, the smelting and electric-shock processes can reduce energy consumption and production cost, meanwhile, the high-speed wire rolling process is adopted to realize the high-speed wire rolling wire rod with temperature control, rolling control and cooling control, the offline solid solution treatment is adopted, the wire rod is subjected to solid solution treatment, then is subjected to uncoiling and straightening and grinding processing, and the silver bright rod after grinding is subjected to eddy current inspection and ultrasonic inspection, so that the production cost is reduced and the production efficiency is improved.

[0072] Second embodiment

[0073] Please refer to Figure 2 Based on the silver bright steel rod for an internal combustion engine valve and the production method thereof provided in the first embodiment of the application, the second embodiment of the application provides another silver bright steel rod for an internal combustion engine valve and a production method thereof. The second embodiment is only a preferred mode of the first embodiment, and the implementation of the second embodiment will not affect the implementation of the first embodiment.

[0074] Specifically, the silver bright steel rod for an internal combustion engine valve and the production method thereof provided in the second embodiment of the application are different from the first embodiment in that the detection device 1 is internally provided with a storage device 3, the storage device 3 comprises a rotating rod 31, a supporting plate 32, two moving grooves 33, two moving blocks 34, two moving rods 35, two sliding sleeves 36, a moving plate 37 and two second stretchers 38, the rotating rod 31 is rotationally connected to the inside of the detection device 1, one end of the supporting plate 32 is fixedly connected to the surface of the rotating rod 31, the two moving grooves 33 are both formed in the inside of the supporting plate 32, the two moving blocks 34 are both slidingly connected to the inside of the two moving grooves 33, one end of each of the two moving rods 35 is rotationally connected to the bottom of each of the two moving blocks 34, the two sliding sleeves 36 are both fixedly connected to the inside of the detection device 1, one side of the moving plate 37 is fixedly connected to one end of the moving rod 35, and the two second stretchers 38 are both fixedly installed on the two sides of the detection device 1.

[0075] The two moving rods 35 are both slidingly connected to the inside of the two sliding sleeves 36, and one end of each of the two moving rods 35 is fixedly connected to one side of the moving plate 37, so that when the second stretchers 38 drive the moving plate 37 to move, the two moving rods 35 simultaneously move in the two sliding sleeves 36.

[0076] One side of the second stretcher 38 is fixedly installed on the two sides of the detection device 1, and the output end is fixedly installed on one end of the moving plate 37, the second stretcher 38 is a pneumatic cylinder, a hydraulic rod or an electric push rod, and is used to drive the moving plate 37 to move after being started.

[0077] Supporting plate 32 is used for temporarily storing steel bars after closing, so as to facilitate workers to unload the steel bars.

[0078] The working principle of the silver bright steel bar for internal combustion engine valve and the production method thereof provided by the application is as follows:

[0079] In use, the two second stretchable members 38 are started to contract, so as to drive the moving plate 37 to move to one side, and when the moving plate 37 moves to one side, the two moving rods 35 move to one side in the two sliding sleeves 36 respectively.

[0080] When the two moving rods 35 move to one side, the two moving blocks 34 move to one side in the two moving grooves 33 respectively, so that the supporting plate 32 rotates to one side in parallel, and the detected steel bars are temporarily stored.

[0081] When the blanking ends, the second stretchable member 38 is started to extend, so as to drive the moving plate 37 connected with the two moving rods 35 to move to one side, and the two moving blocks 34 move to one side in the two fixed grooves 41 respectively, so that the supporting plate 32 connected with the rotating rod 31 rotates to one side to open.

[0082] Compared with the related art, the silver bright steel bar for internal combustion engine valve and the production method thereof provided by the application have the following beneficial effects:

[0083] The silver bright steel bar for internal combustion engine valve and the production method thereof provided by the application temporarily store the detected steel bars through the storage device 3, so as to prevent the detected steel bars from being blanked by the blanking device 2 all the time, affect the blanking of the blanking device 2, and control the number of blanking according to needs.

[0084] Third embodiment

[0085] Please refer to Figure 3 and Figure 4 Based on the silver bright steel bar for internal combustion engine valve and the production method thereof provided by the first embodiment of the application, the third embodiment of the application provides another silver bright steel bar for internal combustion engine valve and the production method thereof. The third embodiment is only a preferred mode of the first embodiment, and the implementation of the third embodiment does not affect the separate implementation of the first embodiment.

[0086] Specifically, the third embodiment of the present application provides a silver bright steel rod for internal combustion engine valves and a production method thereof, which differs from the silver bright steel rod for internal combustion engine valves and the production method thereof in that two pressing blocks 6 are slidably connected to the inside of the support plate 32, and a fixing device 4 is arranged in the inside of the detection device 1, wherein the fixing device 4 comprises a fixing groove 41 and a fixing plate 42, the fixing groove 41 is arranged in the inside of the detection device 1, and the fixing plate 42 is slidably connected to the inside of the fixing groove 41.

[0087] A reset device 5 is arranged in the inside of the support plate 32, wherein the reset device 5 comprises a reset groove 51, a reset plate 52 and a plurality of reset pieces 53, the reset groove 51 is arranged in the inside of the support plate 32, the reset plate 52 is slidably connected to the inside of the reset groove 51, and the plurality of reset pieces 53 are arranged in the inside of the reset groove 51.

[0088] One end of the fixing plate 42 is fixedly connected to one side of the reset plate 52.

[0089] One end of the reset piece 53 is fixedly installed on one side of the inner wall of the reset groove 51, and the other end is fixedly installed on one side of the reset plate 52, and the reset piece 53 is a spring or a spring, which is used to push the reset plate 52 to move and reset to one side.

[0090] The silver bright steel rod for internal combustion engine valves is prepared by the production method of the silver bright steel rod for internal combustion engine valves, and comprises the following components: C: 0.61, Si: 0.21, Mn: 10.37, P: 0.027, S: 0.006, Cr: 20.63, Ni: 0.63, Mo: 0.85, N: 0.51, V: 0.87, Nb: 1.15, and Cu: 0.08.

[0091] The working principle of the silver bright steel rod for internal combustion engine valves and the production method thereof provided by the present application is as follows:

[0092] When the moving block 34 moves to one side in the inside of the moving groove 33, the pressing block 6 is driven to move to one side, and when the pressing block 6 moves to one side and contacts the reset plate 52, the reset plate 52 is pushed to move to one side in the inside of the reset groove 51, and the reset piece 53 is extruded, and when the reset plate 52 moves to one side and pushes the fixing plate 42 into the inside of the fixing groove 41, the support plate 32 is limited.

[0093] When the moving block 34 resets, the reset piece 53 pushes the reset plate 52 to move to one side in the inside of the reset groove 51, thereby driving the fixing plate 42 to move to one side in the inside of the fixing groove 41 and reset.

[0094] Compared with the related art, the silver bright steel rod for an internal combustion engine valve and the production method thereof have the following beneficial effects:

[0095] The silver bright steel rod for an internal combustion engine valve and the production method thereof are provided, and the supporting effect of the supporting plate 32 is increased by fixing device 4 cooperating with reset device 5 and extrusion block 6 to support the supporting plate 32.

[0096] The above is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A method for producing bright silver steel bars for internal combustion engine valves, characterized in that, include: The following are the operating steps: S1: Prepare molten steel from raw materials; S2: Ingot casting: The process of pouring molten steel into a steel ingot mold to prepare a billet; S3: Electroslag remelting: The electroslag base billet produced by ingot casting is welded with a dummy electrode and then electroslag remelted to obtain an electroslag steel ingot weighing 1 ton. S4: Rolling and billet preparation: The billet is rolled and prepared by two heating processes. The first heating process is held at 1200℃ for 180 minutes. The second heating process is held at 1200℃ for 60 minutes. The billet is then air-cooled and transferred to another location for rolling. S5: High-speed wire rod rolling: The initial square billet is heated in a walking beam furnace, and then rolled and deformed through multiple passes such as intermediate rolling, second intermediate rolling, third intermediate rolling, pre-finishing rolling, finishing rolling and sizing reduction to the final wire rod specification Φ13.1mm. After the wire is produced, it is air-cooled and collected, and then transferred to the heat treatment process. S6: Solution treatment: After heating the rolled parts to 1075±4℃ in a box furnace, hold them at that temperature for 2 hours. After holding, remove them directly from the furnace and cool them with water. S7: Straightening: After the wire rod is coated with ash and dried, it is straightened to a bar to obtain a straight bar with a straightness of ≤1mm / m and a fixed length of 4m. S8: Grinding: A polished bar made by grinding a straightened round bar with a diameter of Φ13.1mm through multiple passes on a grinding machine; S9: Non-destructive testing: Polished bars undergo non-destructive testing using a testing device to obtain qualified Φ12.5mm bright silver bars. After passing inspection, the products are put into storage.

2. The method for producing a bright silver steel bar for internal combustion engine valves according to claim 1, characterized in that, In step 3, the slag material selected for electroslag remelting is: CaF2:Al2O3:MgO = 70%:25%:5%, the remelting current is 6300A, the voltage is 44V, and the remelting time is 240 minutes.

3. The method for producing a bright silver steel bar for internal combustion engine valves according to claim 1, characterized in that, In step 5, the initial rolling temperature of the square billet is divided into the following sections: preheating section: ≤800℃, heating section 1: 990~1120℃, heating section 2: 1140~1190℃, soaking section: 1170~1190℃, initial rolling temperature: 1170~1190℃, and induction heating is used to supplement the temperature of the Ф85 round billet in front of the 7-stand rolling mill to 1120℃.

4. The method for producing a bright silver steel bar for internal combustion engine valves according to claim 1, characterized in that, In step 10, the round bar is processed by a grinding machine into a polished bar with a diameter of Φ12.50mm and a surface roughness Ra≤1.6um.

5. The method for producing a bright silver steel bar for internal combustion engine valves according to claim 1, characterized in that, The detection device includes a feeding device, which includes a discharge port, a baffle, a movable frame, and two first telescopic members. The discharge port is located inside the detection device. The baffle is slidably connected to the inside of the detection device. The bottom of the movable frame is fixedly connected to the bottom of the baffle. One side of each of the two first telescopic members is fixedly installed on both sides of the detection device.

6. A method for producing a bright silver steel bar for internal combustion engine valves according to claim 5, characterized in that, The first telescopic component is a hydraulic rod, one side of which is fixedly installed on one side of the detection device, and the output end is fixedly installed on one end of the movable frame.

7. A method for producing a bright silver steel bar for internal combustion engine valves according to claim 6, characterized in that, The detection device has an internal storage device, which includes a rotating rod, a support plate, two movable slots, two movable blocks, two movable rods, two sliding sleeves, a movable plate, and two second telescopic members. The rotating rod is rotatably connected to the inside of the detection device. One end of the support plate is fixedly connected to the surface of the rotating rod. The two movable slots are both opened inside the support plate. The two movable blocks are slidably connected to the inside of the two movable slots. One end of each of the two movable rods is rotatably connected to the bottom of the two movable blocks. The two sliding sleeves are fixedly connected to the inside of the detection device. One side of the movable plate is fixedly connected to one end of the movable rod. The two second telescopic members are fixedly installed on both sides of the detection device.

8. A method for producing a bright silver steel bar for internal combustion engine valves according to claim 7, characterized in that, The support plate has two pressing blocks that are slidably connected inside. The detection device has a fixing device inside, which includes a fixing groove and a fixing plate. The fixing groove is opened inside the detection device, and the fixing plate is slidably connected inside the fixing groove.

9. A method for producing a bright silver steel bar for internal combustion engine valves according to claim 8, characterized in that, The support plate is provided with a reset device, which includes a reset groove, a reset plate and multiple reset components. The reset groove is opened inside the support plate, the reset plate is slidably connected to the inside of the reset groove, and the multiple reset components are all disposed inside the reset groove.

10. A bright silver steel bar for internal combustion engine valves, characterized in that, The bright steel rod for internal combustion engine valves is prepared by the production method of the bright steel rod for internal combustion engine valves described in claims 1-9. It includes the following components: C: 0.61, Si: 0.21, Mn: 10.37, P: 0.027, S: 0.006, Cr: 20.63, Ni: 0.63, Mo: 0.85, N: 0.51, V: 0.87, Nb: 1.15, Cu: 0.08.

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