... RANGE:PETROLEUM,CHEMICAL INDUSTRY,METALLURGY,ELECTRIC POWER,SHIPBUILDING,PAPERMAKING,CONSTRUCTION,WATER SUPPLY,SEWERAGE WORKS AND SO ONSTANDARD:ANSI/ASTM,DIN,JIS,ENCERTIFICATE ... PROCESS ARE MADE UPON THE ISO 9001:2000 STRICTLY seamless pipe fittings,45/90/180 degree elbow