API 2B standard specification covers the fabrication of structural steel pipe formed from plate steel with longitudinal and circumferential butt-welded seams, typically in sizes 14 in. outside diameter (OD) and larger (40 in. and larger for LWDS) with wall thickness 3/8 in. and greater (up to a nominal 40 ft in length) suitable for use in construction of welded offshore structures.API 2B standard main steel grade: API 2B 2W LSAW pipe,API 2B 2H LSAW pipe and so on.