石油化工管式炉碳钢和铬钼钢炉管焊接技术条件石油化工管式炉碳钢和铬钼钢炉管焊接技术条件Technical specification for welding of carbon steel and chrome-molybdenum alloy steel tube of petrochemical tubular heater
石油化工管式炉碳钢和铬钼钢炉管焊接技术条件(附条文说明)
Technical specification for welding of carbon steel and chrome-molybdenum alloy steel tube of tubular heater in petrochemical industry