Standard:ASTM A 53 / ASTM A 106 / API 5L GR. B, API 5L / ASTM A 691 / ASTM A 672ASTM / ASME A/SA 335 / A 691Grade: A, B, C, X 42, X 46, X 52, X 60, X 65 & X 7071500 (CU -NI- 70/30)P 5, P 9, P 11, P 22, P 91, 15 MO3, 1 CR, 1 1/4 CR, 2 1/4 CR, 5 CR, 9CR, 91
