... ,200# polishing, 400 # polished 304 seamless tubeStainless steel is a production which not easy rust,acid resistance and corrosion resistance ... 42CrMo, 12Cr1MoVG,Cr5Mo,WB36,BCrMo44,34CrMo4,P5,12CrAISI1010,1020,1045,Gr·65 ,API X52,API X 42and so oneotherDIN,JISspecificationOut diameter6mm ... ,HJ58,HG60,DB685,16Mn,20G,65Mn,510l,ASTMA299,ASTMA515,ASTM A 572,ASTM A 709,ASTMA302,ASTMA537,API X52,API X 42 and ...