Standard specification for age - hardening alloy steel forgings for pressure vessel components 压力容器部件用时效硬化合金钢锻件的标准规范
3.
Iron and steel . case hardened alloy steels for solid highly - stressed mechanical parts . grades . semi - finished products and bars 钢铁.高应力机械零件用渗碳合金钢.等级.半成品和棒材