Method for refining grains of austenitic stainless steel forged pieces

A technology for austenitic stainless steel and grain refinement, applied in the field of grain refinement of austenitic stainless steel forgings, can solve problems such as uneven grain size, achieve uniform grain, not easy to crack, and improve quality
CN109735696AActive Publication Date: 2019-05-10无锡市法兰锻造有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
无锡市法兰锻造有限公司
Publication Date
2019-05-10

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Abstract

The invention discloses a method for refining grains of austenitic stainless steel forged pieces. The method comprises the following steps of S1, forging and S2, heat treatment, wherein in the step S1, stainless steel ingots are forged, the initial forging temperature for forging is 1,000-1200 DEG C, the final forging temperature is 720-850 DEG C, the deformation rate is 0.01-0.45S<-1>, the totalforging ratio is not less than 3, and the forging ratio of the last fire is not less than 20% of the total forging ratio; and in the step S2, the forged pieces obtained in the step S1 are subjected toheat treatment at 1000-1200 DEG C for 1.0-2.0 min / mm to obtain the austenitic stainless steel forged pieces. Compared with the prior art, the austenite stainless steel forged pieces have more uniformand finer grain and good intergranular corrosion resistance, the tensile strength, the yield strength and the impact work of the austenite stainless steel forged pieces are increased at the same time, and the comprehensive performance of the austenite stainless steel forged pieces is improved.
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Description

technical field

[0001] The invention belongs to the technical field of forging and heat treatment, and in particular relates to a method for refining grains of an austenitic stainless steel forging. Background technique

[0002] Austenitic stainless steel is a solid solution of carbon in γ-Fe, non-magnetic, has high toughness and plasticity, and has very good corrosion resistance. Due to its unique corrosion resistance and ease of processing, austenitic stainless steel has been widely used in petroleum, chemical, medical, environmental protection, food and other industries.

[0003] During the formation process of austenitic stainless steel castings, problems such as shrinkage cavity shrinkage, segregation, pores, microcracks, and non-metallic inclusions will occur, which seriously reduce the performance of castings and bring great harm to daily production. Even after post-heat treatment such as complete annealing, these defects will not be completely eliminated.

[0004] ...

Claims

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