... E)Technology:Hot Rolled, Cold Drawn &thermal expansionApplication:Transportation of oil, gas or fluid, Construction, Electricity, Machine building industry, ... 65-75mm)Standard1)Boiler pipe: ASTM A106,DIN17175,GB30872)Oil pipe:GB99483)High-pressure seamless tube:GB64794)Hydraulic pillar ... A106c,ST45.8/3,10,202)Oil pipe:20,12CrMo,15CrMo3)High-pressure seamless tube:20,16Mn,Q3454)Hydraulic pillar tube: ...