Specification for forged or rolled alloy - steel pipe flanges , forged fittings , and valves and parts for high - temperature service 高温设备用锻制或轧制合金钢管法兰锻制管件阀门及零件规范
Standard specification for forged or rolled alloy - steel pipe flanges , forged fittings , and valves and parts for high - temperature service 高温设备用锻制或轧制合金钢管法兰锻制管件阀门及零件的标准规范