ASTM A234 is standard specification for wrought carbon steel & alloy steel pipe fittings which covers seamless and welded types.

ASTM A234 pipe fittings are available in latest revision of ASME b16.9, b16.11, mss-sp-79, mss-sp-83, mss-sp-95, and mss-sp-97. Also widely used in pressure piping and in pressure vessel fabrication for service at moderate and elevated temperatures. The grades are ASTM a234 wpb, wpc, wp5, wp9, wp91, wp11, wp12 and wp22.