... casing Pip, joint materialJ55,K55,N80-11000002Oil line pipe B,X42~X60(L245~L415)50003high-pressure boiler tube20G50004lower ... P9145006lower/medium-pressure boiler tube10,20200007Hydraulic pillar tube20,30,45,27SiMn225008pipes for high-pressure fertilizer equipment10,20,16Mn, ... ,12CrMo,15CrMo90009Structural use of seamless steel tubes10,20,45,35CrMo,40Cr3500010Shipping use of tube320,360,410,4609000 ...