Welding and post-weld heat treatment process for martensitic precipitation hardening stainless steel materials
A post-weld heat treatment and precipitation hardening technology, used in heat treatment furnaces, heat treatment equipment, welding equipment, etc., can solve problems such as inability to perform surface treatment, inhibit carbon diffusion and ferrite formation, relax welding stress, and reduce welding stress. Effects of Small Weld Segregation and Hot Cracking Tendency
Active Publication Date: 2022-06-14
HARBIN ELECTRIC POWER EQUIP
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Problems solved by technology
[0006] For welded parts of martensitic precipitation hardening stainless steel using ASTM standard S17400.17-4PH of the American Society for Testing and Materials, under the premise of ensuring the mechanical properties of the weld metal, extremely high surface quality is required, but due to structural reasons, welding and welding There is no solution to the problem that surface treatment cannot be performed after post heat treatment
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[0020] The present invention will be further described below with reference to specific embodiments.
[0021] Welding using American Welding Society AWS standard A5.14 / A5.14M.ERNiCr-3 nickel-chromium wire and tungsten argon arc welding method; martensitic precipitation hardening stainless steel in American Society for Testing and Materials ASTM standard S17400: 17-4PH The standard material is welded in a solid solution state; aging heat treatment is performed on the weld and stainless steel material after welding, so that the weld metal has high strength, toughness and plasticity, and the stainless steel material and the weld surface obtain a good surface quality, including the following step:
[0022] (1) Before welding, clean the welding groove and nearby areas to remove impurities;
[0023] (1.1) Use machining or grinding to remove the oxide layer in the welding groove and the nearby 25mm area;
[0024] (1.2) Use alcohol or acetone solvent to wipe and clean the welding gr...
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The invention discloses a welding and post-weld heat treatment process for martensitic precipitation-hardening stainless steel materials, using nickel-chromium (American Welding Society (AWS) standard A5.14 / A5.14MERNiCr‑3) welding wire and tungsten argon arc welding Welding method; welding in martensitic precipitation hardening stainless steel (American Society for Testing and Materials (ASTM) standard S17400 (17-4PH)) material in a solid solution state; after welding, aging heat treatment is carried out on the weld seam and stainless steel material, so that the welding The seam metal has high strength, toughness and plasticity, and at the same time, the stainless steel material and the surface of the weld seam obtain a good surface quality. The invention uses nickel-based alloy welding wire for welding and selects appropriate post-weld heat treatment process parameters for aging treatment, so that the weld metal has high strength, toughness and plasticity, and at the same time, the stainless steel material and the surface of the weld seam obtain good surface quality.
Description
Technical field: [0001] The invention relates to a process method for welding and post-weld heat treatment of a martensitic precipitation hardening stainless steel material. Background technique: [0002] The martensitic precipitation hardening stainless steel material of the American Society for Testing and Materials ASTM standard S17400.17-4PH is used to obtain lath martensite during the solid solution process at 1024-1052 °C, thereby achieving microstructure strengthening. At 450-620 °C Precipitation hardening is achieved by the precipitation of intermetallic compounds during the aging process. Due to its excellent corrosion resistance, wear resistance, high temperature resistance, and high strength, it is widely used in marine industry, food industry, and high-temperature operating mechanical parts. [0003] The martensitic precipitation hardening stainless steel material using ASTM standard S17400.17-4PH has good weldability. The welding needs to be carried out in the ...
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IPC IPC(8): B23K9/167B23K9/235B23K9/32B23K35/30C21D9/00
CPCB23K9/235B23K9/32B23K9/167B23K35/30C21D9/00
Inventor 杜雷郑吉伟刘大为李雅范宋丹曲兆国张晨光秦斌杜娟张锁瑶张静钰
Owner HARBIN ELECTRIC POWER EQUIP