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A 53, ASTM A 106 GR A/B/C, AP15A, B, 5AX, 5L, 5LX, X51 & X60, NACE MR 0175, IS 3589 (BLACKGR 330 & GR 410 ) SAW 672 etc. A333 GR1, GR3, GR4, GR6, GR7, GR8, GR10, A334 GR 1, GR3, GR 6,GR 7, GR8, GR9, IS 2002, IS 2062, ASTM A 515,516,517, GR 55,60,65,70.