... API 5CT 2.API 5L 3.ASTM A53 ,A106, A179,A192,A199,A210,A213,A333,A334,A556 4.DIN 17175,1629 ... Pipes/Tubes: 1. API 5CT 2. API 5L 3. ASTM A135,A53,A252,A500 4. DIN 2440 5. BS 1387 ... ,G3452,G3454,C8305,C3466 Stainless steel welded Pipes/Tubes: 1. ASTM A312, A358, A778 / ANSI B36.19 ,JIS G3459 2 ... . JIS G3448 JIS G3468 3. ASTM A270 / JIS G3447 4. ASTM A249, A269 / JIS G3463 Stainless steel seemless ...