carbon steel elbow 1.Wall thickness: From Sch5 to Sch160/STD/XS/XXS ... , 3.standard:ANSI B ASTM A234 WPB ELBOW :we are manufacturer for carbon steel pipe and fittings,like 45deg,90deg,180deg,L ... /R,bend ,equal or reducing tee, CON reducer, ECC reducer, pipe cap,flange. CON AND ECC REDUCER: CARBON STEEL,STAINLESS,STELL ... process are made under the ISO 9001:2000 strictly. carbon pipe fitting