SIZE DIAMETER: 15mm NB to 1200mm NB as per ANSI B 16.5 Pressure rating form 150 Lbs to 2500 Lbs Size Larger Than 600NB AS PER API 605 or M.S.SP 44 up to 1200mm NB GRADE AVAILABLE. Carbon Steel ASTM A105 A105N A694 F42 46 52 56 60 65 70 A350 LF3 A350 LF2, etc. Alloy Steel ASTM A182 F1 F5 F9 F11 F22 F91/etc. Stainless Steel ASTM A182 F304 304L 304H 316 316L 317 317L