A heat treatment method for improving hydrogen embrittlement resistance of 316L stainless steel
By performing 20% pre-cooling rolling and 1000℃ annealing and water quenching on 316L stainless steel, a high-proportion Σ3 coherent twin boundary network was constructed, which solved the problem of increased hydrogen embrittlement after recrystallization of 316L stainless steel, and achieved excellent resistance to hydrogen embrittlement at high temperature, meeting the service requirements of hydrogen environment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HEFEI UNIV OF TECH
- Filing Date
- 2026-04-16
- Publication Date
- 2026-07-17
AI Technical Summary
Existing heat treatment methods cannot effectively construct hydrogen-resistant twin boundary networks after recrystallization of 316L stainless steel, resulting in increased hydrogen embrittlement sensitivity at high temperatures and failing to meet the requirements for safe service in hydrogen environments.
By subjecting cold-rolled 316L stainless steel to 20% pre-cooling and short-time annealing at 1000℃ combined with water quenching, a high proportion of Σ3 coherent twin boundaries are induced to form, constructing a hydrogen-resistant twin boundary network and regulating the distribution of grain boundary characteristics to suppress hydrogen embrittlement.
The hydrogen embrittlement index was significantly reduced from 43.4% to 7.3%, achieving excellent resistance to hydrogen embrittlement of 316L stainless steel at high temperatures and meeting the safe service requirements of hydrogen environments such as hydrogen energy and nuclear power.
Smart Images
Figure CN122405937A_ABST