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Postweld heat treatment optimization process of 347H type stainless steel weldment
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A post-weld heat treatment, stainless steel technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as reheat crack stress, release cracks, σ phase embrittlement, etc., and achieve good mechanical properties and corrosion resistance. power-up effect
Inactive Publication Date: 2020-04-17
合肥实华管件有限责任公司
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[0009] In order to solve the problems of σ-phase embrittlement, reheat cracks and stress release cracks in 347H stainless steel welded parts after traditional post-weld heat treatment, while maintaining the good mechanical properties and corrosion resistance of 347H materials, the invention provides 347H stainless steel welded parts Post-weld heat treatment optimization process
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Embodiment 1
[0044] Such as figure 1 As shown, the post-weld heat treatment optimization process of 347H stainless steel weldment includes the following steps:
[0045] 1) Put the 347H stainless steel weldment that needs post-weld heat treatment into the heat treatment furnace, and raise the temperature at a rate of 15°C to 20°C per minute, and raise the temperature to 600°C±10°C;
[0046]2) Constant temperature, the constant temperature is 600°C±10°C, the constant temperature time is the minimum wall thickness of the workpiece × 4.7 minutes, and the constant temperature time is not less than 120 minutes;
[0047] 3) Heating, the heating rate is 20℃~30℃ per minute, and the temperature is raised to 1050℃±10℃;
[0048] 4) Constant temperature, the constant temperature is 1050°C±10°C, the constant temperature time is the minimum wall thickness of the workpiece × 4.7 minutes, and the constant temperature time is not less than 120 minutes;
[0049] 5) Cool down in the furnace, the cooling rat...
Embodiment 2
[0053] The post-weld heat treatment optimization process of 347H type stainless steel weldment, which includes the following steps:
[0054] 1) Put the 347H stainless steel weldment that needs post-weld heat treatment into the heat treatment furnace, and raise the temperature at a rate of 15°C to 20°C per minute, and raise the temperature to 600°C±10°C. The 347H stainless steel includes the Chinese brand 07Cr18Ni11Nb stainless steel;
[0055] 2) Constant temperature, the constant temperature is 600°C ± 5°C, the constant temperature time is the minimum wall thickness of the workpiece × 4.7 minutes, and the constant temperature time is not less than 120 minutes;
[0056] 3) Heating, the heating rate is 20 ℃ ~ 30 ℃ per minute, and the temperature is raised to 1050 ℃ ± 5 ℃;
[0057] 4) Constant temperature, the constant temperature is 1050°C±10°C, the constant temperature time is the minimum wall thickness of the workpiece × 4.7 minutes, and the constant temperature time is not le...
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Abstract
The invention discloses a postweld heat treatment optimization process of a 347H type stainless steel weldment, which comprises a staged heat treatment process combination of stress relief treatment,solution treatment and stabilization treatment, and is a multi-step heat treatment process. Experiments prove that the optimized microstructure is obtained and the high-temperature anti-cracking performance of the 347H type stainless steel weldment is remarkably improved after the process treatment is optimized. The phenomena of sigma phase embrittlement, reheating cracks and stress release cracksof the 347H type stainless steel weldment after a traditional heat treatment process are avoided, and meanwhile the mechanical property and the corrosion resistance of the material are reserved.
Description
technical field [0001] The invention relates to the technical field of metal production technology, in particular to a post-weld heat treatment process for 347H stainless steel welded parts used in high-temperature, high-pressure and hydrogen-facing working conditions of petrochemical plants. Background technique [0002] 347H is the abbreviation of the unified number code UNS S34779, and the corresponding Chinese brand is 07Cr18Ni11Nb. 347H stainless steel belongs to niobium-stabilized austenitic stainless steel. Niobium is added to improve intergranular corrosion resistance. It has good corrosion resistance in acid, alkali, salt and other corrosive media. It can be used as both corrosion-resistant materials and heat-resistant steel. It is mainly used in thermal power plants, petrochemical and other fields, such as making pressure vessels, pressure pipes and heat exchangers. [0003] When the service temperature of 347H stainless steel parts is lower than 454 ° C, and ther...
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