1.grade : astm a335 p12 2.standard : ASTM JIS DIN GB EN 3.have ... standardGB,ASTM, AISI, SAE, API , JIS, EN, DIN.GOST.Productsbar,plate&sheet,seamless tube,welded pipe,wire)Oil pipeAPI 5L X52 ... ,st37,st45.8low alloy steel pipeST52.4130,4135,4140,4150,P91,T91 P92,T92, P5, P9,T5,T9,P11,P12,P22stainless304 ...