Strain-hardening are mainly determined by strength, elongation and strength yield ratio of virginsteel, among which the strength yield ratio is the most important influence factor.
板材冷作硬化效应主要取决于母材的强度、伸长率和强屈比，其中强屈比对型钢的冷作硬化效应影响最大；
2
By using reliability design methods, minimal reliability of virgin static strength of steel thin wall cylinder during pressure test is quantitative analyzed.