2022-01-24 High pressure forged steel fittings are machined from round steel or steel ingots that in standard of ASME B16.11. There are three connection type that threaded (THD) , socket weld (SW) and butt weld (BW). And size range is 1/8" to 4" and the pressure is Class 2000 lbs, 3000lbs, 6000 lbs and 9000 lbs. The common used material grades are ASTM A105, A350 LF2, A182 F304 & 316.