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CN-122013025-A - Preparation method of wire rod for welding high-manganese high-aluminum light steel

CN122013025ACN 122013025 ACN122013025 ACN 122013025ACN-122013025-A

Abstract

The invention relates to the field of metal material preparation, and discloses a preparation method of a wire rod for welding high-manganese high-aluminum light steel. The method comprises the steps of preparing materials according to target components of a wire rod for welding high-manganese high-aluminum light steel, adopting vacuum induction smelting, pouring into steel ingots after smelting, demoulding, immediately slowly cooling, adopting the steel ingots obtained by vacuum induction smelting as consumable electrodes, carrying out electroslag remelting purification to obtain electroslag ingots, carrying out hot forging cogging on the electroslag ingots to prepare square billets suitable for high-speed wire rod rolling, adopting a high-speed wire rod rolling mill to continuously roll the square billets to prepare wire rods with target sizes, and carrying out high-temperature solution treatment on the rolled wire rods to obtain the wire rods. The method reduces the burning loss of Al, mn and C components, effectively improves the solidification segregation, reduces the precipitation of brittle phases, eliminates the inclusion, reduces the problems of heat treatment cracking risk and poor surface quality, and has excellent cold drawing processability.

Inventors

  • WANG YINING
  • LI YUAN
  • WU ZHIWEI
  • WANG YINGHU

Assignees

  • 攀钢集团江油长城特殊钢有限公司

Dates

Publication Date
20260512
Application Date
20260327

Claims (10)

  1. 1. The preparation method of the wire rod for welding the high-manganese high-aluminum light steel is characterized by comprising the following steps of: preparing materials according to target components of a wire rod for welding high-manganese high-aluminum light steel, adopting vacuum induction smelting, pouring into steel ingots after smelting, and immediately slow cooling after demoulding, wherein the target components comprise, by mass, 0.03% -0.12% of C, 16.0% -19.0% of Cr, 6.0% -10.0% of Ni, 10.0% -18.0% of Mn, 4.0% -8.0% of Al, and the balance of Fe and unavoidable impurities; taking the steel ingot obtained by vacuum induction smelting as a consumable electrode, and carrying out electroslag remelting purification to obtain an electroslag ingot; Hot forging and cogging the electroslag ingot to prepare a square billet suitable for high-speed wire rod rolling; Continuously rolling the square billet by adopting a high-speed wire rod rolling mill to prepare a coil with a target size; and carrying out high-temperature solution treatment on the rolled wire rod to obtain the wire rod.
  2. 2. The method for manufacturing a wire rod for welding high-manganese high-aluminum light steel according to claim 1, wherein the vacuum induction smelting comprises: filling an iron source, a chromium source and a nickel source in the raw materials into the bottom of a crucible, sub-packaging a manganese source, an aluminum source and a carbon source into a vacuum hopper, vacuumizing until the vacuum degree in the furnace is lower than 5Pa, and then heating and melting; After the furnace burden is completely melted, heating to 1560-1590 ℃, adding a carbon source to adjust the carbon content, and refining for 20-40 min under heat preservation; After refining, breaking vacuum and filling high-purity argon to 4000-6000 MPa, adding a manganese source and an aluminum source in 2-5 batches, wherein the addition amount of each batch is controlled to ensure that molten steel is not solidified and the surface is not crusted, carrying out electromagnetic stirring uniformly, heating to 1580-1610 ℃, and carrying out heat preservation for 5-10 min; And (3) pouring under the protection of argon, wherein the pouring temperature is controlled at 1550-1580 ℃, pouring into steel ingots, immediately placing into a slow cooling pit after demoulding, and slowly cooling for more than 24 hours, wherein the slow cooling rate is lower than 50 ℃ per hour.
  3. 3. The method for manufacturing the wire rod for welding the high-manganese high-aluminum light steel according to claim 2, wherein the iron source is industrial pure iron, the chromium source is metallic chromium, the nickel source is electrolytic nickel, the manganese source is electrolytic manganese, the aluminum source is metallic aluminum, and the carbon source is high-purity graphite.
  4. 4. The method for preparing the wire rod for welding the high-manganese high-aluminum light steel, which is disclosed in claim 1, is characterized in that slag system used in electroslag remelting is CaF 2 -Al 2 O 3 -CaO ternary covering slag, the mass ratio of the slag system is 25% -35% of Al 2 O 3 , the mass ratio of the slag system is 5% -10% of CaO and the balance of CaF 2 , the slag is baked for more than 4 hours at the temperature of more than 700 ℃ in advance, water is completely removed, and nickel-magnesium alloy is adopted as a deoxidizer.
  5. 5. The method for preparing the wire rod for welding the high-manganese high-aluminum light steel according to claim 1, wherein the whole electroslag remelting process is protected by high-purity argon, the melting speed is reduced, the melting speed is controlled to be 6-10 kg/min, and the current is gradually reduced in the feeding stage.
  6. 6. The method for preparing the wire rod for welding the high-manganese high-aluminum light steel, which is characterized in that the electroslag ingot obtained by electroslag remelting is immediately subjected to cover cooling after being demolded, and the slow cooling time is more than 60 hours.
  7. 7. The method for manufacturing a wire rod for welding high-manganese high-aluminum light steel according to claim 1, wherein hot forging cogging of the electroslag ingot comprises: placing the electroslag ingot into a heating furnace, heating to 1150-1250 ℃, and keeping the temperature for 60-90 min according to the section of the ingot, wherein the thickness of each 100mm is kept, so that the internal and external temperatures of the steel ingot are uniform; forging and cogging the billet by one firing time after pre-upsetting and drawing to prepare a square billet, wherein the forging temperature is above 1050 ℃ and the final forging temperature is above 900 ℃; Cooling the forged square billets in a vertical pile or furnace for more than 36 hours; And (3) carrying out surface grinding on the cooled square billet, removing surface defects, and cutting into a specified length suitable for high-speed wire rod rolling.
  8. 8. The method for manufacturing a wire rod for welding high-manganese high-aluminum light steel according to claim 1, wherein continuously rolling the square billet with a high-speed wire rolling mill comprises: the step-type heating furnace is adopted for sectional heating, the temperature of a preheating section is 800-900 ℃, the temperature of a heating section is 1120-1220 ℃, the temperature of a soaking section is 1180-1200 ℃, the total heating time is 120-180 min, and the uniform temperature inside and outside the blank is ensured without overheating and overburning; after the blank is discharged from the furnace, removing scales by adopting 18-25 MPa high-pressure water, and thoroughly removing surface oxidized iron scales; rolling the blank by adopting multi-pass continuous rolling of rough rolling, intermediate rolling, pre-finish rolling and finish rolling; And (3) after rolling, adopting a wire laying machine to manufacture a coil, controlling the wire laying temperature to be 880-920 ℃, and after wire laying, adopting a stelmor air cooling line to control and cool, wherein the air cooling speed is 5-10 ℃ per second, and cooling to room temperature to obtain the coil.
  9. 9. The method for preparing the wire rod for welding the high-manganese high-aluminum light steel according to claim 8, wherein the initial rolling temperature of rough rolling is 1100-1150 ℃, the single-pass deformation of rough rolling is 15-25%, the total deformation of a unit is 40-50%, the single-pass deformation of medium rolling is 12-20%, the total deformation of the unit is 30-40%, the finish rolling inlet temperature is 950-1000 ℃, the finish rolling finishing temperature is 900-950 ℃, the single-pass deformation of pre-finish rolling is 8-15%, the total deformation of the unit is 15-25%, the single-pass deformation of finish rolling is 5-12%, the total deformation of the unit is 8-15%, and the total deformation of rolling is more than or equal to 95%.
  10. 10. The method for manufacturing a wire rod for welding high-manganese high-aluminum light steel according to claim 1, wherein the high-temperature solution treatment of the rolled wire rod comprises: Placing the coil into a continuous solution heat treatment furnace, introducing an oxidation-free protective atmosphere in the whole process, heating to 1050-1150 ℃, and calculating the heat preservation time according to 1.0-2.0 min/mm+30min to ensure that carbide and brittle intermetallic phases in steel are completely dissolved and the structure is completely austenitized; after the heat preservation is finished, immediately feeding water into the coil or forcefully cooling the coil by air, and rapidly cooling the coil to room temperature; and (5) carrying out surface cleaning, drying, size and performance inspection on the wire rod to obtain the wire rod.

Description

Preparation method of wire rod for welding high-manganese high-aluminum light steel Technical Field The invention relates to the field of metal material preparation, in particular to a preparation method of a wire rod for welding high-manganese high-aluminum light steel. Background 300-Series austenitic stainless steel is widely applied to the fields of high-end manufacture, rail transit, automobile industry, aerospace and the like due to excellent corrosion resistance, formability and toughness, but has a large specific gravity (density of about 7.93g/cm 3), relatively low strength and high cost, and is limited in the field of high-end equipment with increasingly urgent light weight requirements. The Fe-Mn-Al-C series high-manganese high-aluminum light steel can obviously reduce the steel density to below 7.0g/cm 3 through C, al and Mn alloying, and meanwhile, improves the specific strength, thus being a popular research and development direction of light metal materials. However, the existing welding wire rod manufacturing process of Fe-Mn-Al-C series high-manganese high-aluminum steel has a plurality of challenges. The high-precision high-quality wire rod is difficult to stably prepare due to the fact that C, mn and Al are high in content and high in activity, oxidation burning loss, mn evaporation and serious component segregation are easy to occur in a smelting process, the heat processing plasticity of the material is poor due to the fact that impurities in steel and gas are high in content, high-melting-point brittle impurities such as Al 2O3, mnO and AlN are easy to generate in the smelting process, the high-melting-point brittle impurities are used as crack initiation sources in the rolling process, internal or surface defects are easy to occur in the forging and rolling processes, and high-precision high-quality wire rod is difficult to stably prepare, meanwhile, the high-manganese Gao Lvgang wire rod prepared by the existing technology is high in tissue stress due to component segregation, the internal stress is further increased due to the fact that a precipitation phase is serious, so that the rolling stress is high in the material, brittle kappa carbide, delta-ferrite and Fe-Al system intermetallic phases are generated along crystals, the type precipitation phase is low in hardness, the continuity of a fractured austenite matrix is insufficient, the subsequent cold-drawing wire breakage rate is high, stable cold processing forming is not realized, and application popularization of the material is limited. Therefore, the existing preparation method of the wire rod for welding the high-manganese high-aluminum light steel still has great room for improvement. Disclosure of Invention Aiming at the problems existing in the prior art, the main purpose of the invention is to provide a preparation method of a wire rod for welding high-manganese high-aluminum light steel. According to one aspect of the present invention, there is provided a method for manufacturing a wire rod for welding high manganese high aluminum light steel, the method comprising the steps of: preparing materials according to target components of a wire rod for welding high-manganese high-aluminum light steel, adopting vacuum induction smelting, pouring into steel ingots after smelting, and immediately slow cooling after demoulding, wherein the target components comprise, by mass, 0.03% -0.12% of C, 16.0% -19.0% of Cr, 6.0% -10.0% of Ni, 10.0% -18.0% of Mn, 4.0% -8.0% of Al, and the balance of Fe and unavoidable impurities; taking the steel ingot obtained by vacuum induction smelting as a consumable electrode, and carrying out electroslag remelting purification to obtain an electroslag ingot; Hot forging and cogging the electroslag ingot to prepare square billets suitable for high-speed wire rod rolling; Continuously rolling the square billet by adopting a high-speed wire rod rolling mill to prepare a coil with a target size; and carrying out high-temperature solution treatment on the rolled wire rod to obtain the wire rod. According to one embodiment of the invention, the vacuum induction smelting comprises: filling an iron source, a chromium source and a nickel source in the raw materials into the bottom of a crucible, sub-packaging a manganese source, an aluminum source and a carbon source into a vacuum hopper, vacuumizing until the vacuum degree in the furnace is lower than 5Pa, and then heating and melting; After the furnace burden is completely melted, heating to 1560-1590 ℃, adding a carbon source to adjust the carbon content, and refining for 20-40 min under heat preservation; After refining, breaking vacuum and filling high-purity argon to 4000-6000 MPa, adding a manganese source and an aluminum source in 2-5 batches, wherein the addition amount of each batch is controlled to ensure that molten steel is not solidified and the surface is not crusted, carrying out electromagnetic stirring uniformly, heating to 1580-1610 ℃, a