Our Products(up to 813mm OD) ASTM A 106 Gr.A / Gr.B / Gr.C; ASTM A 333 Gr.6; ASTM A 335 P5 / P11 / P22 / P91; API Gr.B / X42 / X46 / X52 / X56 / X60 / X65 DIN EN 10216 P355N / P355NH / P275NL1 / P235TR1 / P235GH; DIN EN10210 S355J2H / S355J0H / S235JRH / S275J0H / S257J2H; DIN EN 10297 E355 / E355K2； 2. Our Cerficates: CPD, PED, ISO9001 3.Cooperative Third Party for Inspection: IBR, BV, TUV, DNV, SGS, Applus+ and etc.