... , 35 #, 45 #, 20 G, 20 A, 40, 45 Mn2 Mn2, 27 SiMn, 40 MnB, 20 MnVB, 20 Cr, 30 Cr, 35 ... "the quality first, integrity-based" business philosophy, adhere to the "customers first" principle to provide our clients with quality service, welcome the ... mm of seamless steel tube, material for: # 20, 45 #, 16 Mn, 27 SiMn, 15 CrMo, 30 CrMo, 34 CrMo4, 12 CrlMoV, J55 ...