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CN-121992309-A - Hydrogen embrittlement-resistant austenitic stainless steel wire and preparation method thereof

CN121992309ACN 121992309 ACN121992309 ACN 121992309ACN-121992309-A

Abstract

The invention discloses a hydrogen embrittlement-resistant austenitic stainless steel wire and a preparation method thereof, wherein the hydrogen embrittlement-resistant austenitic stainless steel wire comprises the following components in parts by weight ：C≤0.03%,N：0.2-0.5%,Cu：1.8-2.5%,Si：0.3-0.7%,Mn：0.4-0.8%,Mo：0.05-0.2%,Cr;21.5-23%,Ni：10-12%,S≤0.002%,P≤0.003%,O≤0.003%, and the balance of Fe, and the preparation method comprises the steps of vacuum smelting, electrode sample preparation, electroslag remelting, high-temperature forging, high-temperature rolling, annealing treatment and drawing to obtain the hydrogen embrittlement-resistant austenitic stainless steel wire. Compared with the prior art, the invention has high stability and strong hydrogen embrittlement resistance.

Inventors

  • LU HAO
  • BAI GUANSHUN
  • Cai Runhuan
  • GUO YING
  • YAN JINGJUN

Assignees

  • 中国兵器科学研究院宁波分院

Dates

Publication Date
20260508
Application Date
20260122

Claims (10)

  1. 1. The hydrogen embrittlement resistant austenitic stainless steel wire is characterized by comprising the following components in parts by weight ：C≤0.03%,N：0.2-0.5%,Cu：1.8-2.5%,Si：0.3-0.7%,Mn：0.4-0.8%,Mo：0.05-0.2%,Cr：21.5-23%,Ni：10-12%,S≤0.002%,P≤0.003%,O≤0.003%, and the balance of Fe.
  2. 2. The hydrogen embrittlement resistant austenitic stainless steel wire according to claim 1, wherein the mechanical properties of the obtained additive member and welded joint after arc additive manufacturing or welding using the wire are that the tensile strength is not less than 580 MPa, the yield strength is not less than 330 MPa, and the elongation after break is not less than 30%.
  3. 3. A method for preparing the hydrogen embrittlement resistant austenitic stainless steel wire according to any one of claims 1 to 2, which is characterized by comprising the steps of vacuum smelting, preparing an electrode sample, electroslag remelting, high-temperature forging, high-temperature rolling, annealing treatment and drawing to obtain the hydrogen embrittlement resistant austenitic stainless steel wire.
  4. 4. The method for producing a hydrogen embrittlement resistant austenitic stainless steel wire according to claim 3, wherein the vacuum melting is a primary melting of a raw material under a vacuum atmosphere having a vacuum degree of 10-20Pa, and desulfurization and dephosphorization are performed to obtain a primary molten ingot.
  5. 5. The method for preparing a hydrogen embrittlement resistant austenitic stainless steel wire according to claim 3, wherein the electrode sample is prepared by forging the primary molten ingot after heat preservation for 2-4 hours at 1050-1200 ℃, and the final forging temperature is not less than 900 ℃.
  6. 6. The method for preparing a hydrogen embrittlement resistant austenitic stainless steel wire according to claim 3, wherein the high-temperature forging is performed by performing heat preservation on a secondary ingot obtained by electroslag remelting at 1050-1200 ℃ for 2-4h, forging the ingot into a bar, performing final forging at a temperature of not less than 900 ℃, and performing air cooling treatment.
  7. 7. The method for preparing the hydrogen embrittlement resistant austenitic stainless steel wire according to claim 3, wherein the high-temperature rolling is to keep the bar obtained after high-temperature forging at 1050-1200 ℃ for 2-4 hours, and then rolling the bar into a wire rod through multi-pass hot continuous rolling.
  8. 8. The method for preparing hydrogen embrittlement resistant austenitic stainless steel wire according to claim 3, wherein the annealing treatment is water cooling treatment after heat preservation of the rolled wire rod at 1050-1200 ℃ for 1-3 hours.
  9. 9. The method for preparing a hydrogen embrittlement resistant austenitic stainless steel wire according to claim 3, wherein the drawing is performed by washing the annealed wire rod with acid to remove the oxide skin, washing with water, drying in the air, then performing a coating treatment, drying, and drawing.
  10. 10. The method of manufacturing a hydrogen embrittlement resistant austenitic stainless steel wire according to claim 9, wherein the drying temperature of drawing is 80-120 ℃ while in-line annealing is performed at 1000-1200 ℃ during drawing.

Description

Hydrogen embrittlement-resistant austenitic stainless steel wire and preparation method thereof Technical Field The invention relates to the technical field of arc additive manufacturing and welding materials, in particular to a hydrogen embrittlement resistant austenitic stainless steel wire and a preparation method thereof. Background With the rapid development of China in the fields of energy, chemical industry and high-end manufacturing, especially the strategic layout of the hydrogen energy industry driven by a double-carbon target is increasingly clear, and the construction demands of key facilities such as high-pressure hydrogen storage and hydrogen delivery pipelines, large chemical devices and the like are rapidly increased. However, long-term safe operation of these hydrogen-related equipment is facing serious challenges of hydrogen embrittlement. The traditional austenitic stainless steel is widely applied to the fields of petrochemical industry, energy storage, ship manufacturing and the like due to the characteristics of excellent corrosion resistance, good toughness, plasticity and the like, but with the improvement of the requirements of hydrogen-related materials, the traditional austenitic stainless steel additive components and welding seams have strong segregation, the austenitic stability is lower when the austenitic stainless steel is in service in a high-pressure hydrogen environment, the austenitic stainless steel has strong tendency of deformation induced martensitic transformation, and the service requirements are difficult to meet. Therefore, development of hydrogen embrittlement resistant austenitic stainless steel wire materials for arc additive manufacturing and welding is developed, and the method has important engineering application value. Disclosure of Invention The first technical problem to be solved by the invention is to provide a hydrogen embrittlement resistant austenitic stainless steel wire with high stability and strong hydrogen embrittlement resistance. The second technical problem to be solved by the invention is to provide a preparation method of the hydrogen embrittlement resistant austenitic stainless steel wire rod aiming at the state of the art The technical scheme adopted by the invention for solving the first technical problem is that the hydrogen embrittlement resistant austenitic stainless steel wire is characterized by comprising the following components ：C≤0.03%,N：0.2-0.5%,Cu：1.8-2.5%,Si：0.3-0.7%,Mn：0.4-0.8%,Mo：0.05-0.2%,Cr：21.5-23%,Ni：10-12%,S≤0.002%,P≤0.003%,O≤0.003%, in parts by weight and the balance of Fe. C is used as an extremely strong austenite stabilizing and solid solution strengthening element, can obviously improve the strength and hardness of stainless steel, but in the arc material-increasing process, excessive C element can lead C atoms to rapidly diffuse to a crystal boundary, and is combined with chromium (Cr) to form chromium-rich carbide (Cr 23C6), so that the inter-crystal corrosion sensitivity is seriously increased. Therefore, the content of C element in the stainless steel wire is controlled to be lower than 0.03%. N is used as solid solution strengthening element and is mixed into austenitic stainless steel to cause serious lattice distortion, so that the strength of the stainless steel is greatly improved, and meanwhile, N is a stable austenitic element which is stronger than Ni and can partially replace Ni element, so that the austenitic structure can be stabilized, and the production cost can be reduced. Most importantly, after N element is added, the austenite crystal lattice is distorted, the diffusion resistance of hydrogen atoms in the crystal lattice is increased, so that the diffusion capacity of hydrogen is reduced, meanwhile, the stability of austenite is greatly improved, the martensite transformation is restrained, and the hydrogen embrittlement resistance of the whole material is improved. Therefore, the addition of a certain amount of N element in the stainless steel wire plays an important role in stabilizing a tissue structure, improving strength, enhancing hydrogen embrittlement resistance and the like, but with the excessive addition of N element, unstable hydride (NH/NH 2) is formed with hydrogen in a certain environment, so that the performance is reduced, and the opposite effect is achieved. Therefore, in the invention, the content of N element is controlled to be 0.2-0.5%. Cu has strong precipitation strengthening effect, and in the process of material addition, the heat circulation layer by layer creates conditions for the uniform dispersion of a precipitated phase (epsilon-Cu), so that dislocation and crystal boundary are effectively pinned, and when hydrogen enters the material, the hydrogen is fixed, and is difficult to freely diffuse to potential crack initiation points (such as crystal boundary and phase interface) or high-stress areas. This greatly reduces the concentration of diffusible hydrogen, t