PERFECT PRODUCTS ARE OUR ULTIMATE GOALType: Seamless, ERW,LSAWSpecifications: ANSI B36.10, ANSI B 36.19, BS1387, DIN 2448 / 2462, JIS G3462 / G3463/GOST 5632/GOST 550. Materiales: ASTM A53 Gr.B, ASTM A106 Gr.B, STPT 370, STPG 370 ASTM A335 P5 ,P9 ,P11,P12 ,P91,STFA22API 5L A & B , X42, X46, X52, X60,ST37,ST37.2ASTM A312,TP304/304L, TP316/316L,TP321/321H, TP317L, TP347H, 31254 ,TP904LASTM A268 410, 430, 446, 444, L80/13CRASTM A790 S31803 S32205 S32760ASTM B163 Monel400, inconel600, 625, 800H, 825, AL6XN