Butt-welding pipe fittings - Part 4: Wrought austenitic and austenitic-ferritic (duplex) stainless steels with specific inspection requirements

This European Standard specifies the technical delivery requirements for seamless and welded butt-welding fittings (elbows, concentric and eccentric reducers, equal and reducing tees, caps) made of austenitic and austenitic-ferritic (duplex) stainless steel which are intended for pressure and corrosion resisting purposes at room temperature, at low temperature or at elevated temperatures. It specifies: - the type of fittings; - type A (see 7.2) - type B (see 7.3) - the steel grades; - the mechanical properties; - the dimensions and tolerances; - the requirements for inspection and testing; - the inspection documents; - the marking; - the handling and packaging. Unless otherwise specified in this European Standard the general technical delivery requirements in EN 10021 apply.