... ,40Cr,20CrMo,30-35CrMo,42CrMo 2Billet of the fluid seamless pipe 20,Q3453Billet of the boiler pipe20G,12Cr1MoVG,15CrMoG4Billet of petroleum cracking ... pipe 20,12CrMo,1Cr5Mo5Billet of the hydraulic prop tube 20,45,27SiMn6Billet of the high pressure chemical fertilizer equipment pipe 20,16Mn,12CrMO ...