Butt-welding pipe fittings - Part 1: Wrought carbon steel for general use and without specific inspection requirements; German version EN 10253-1:1999— 25 стр.
Butt-welding pipe fittings - Part 4: Wrought austenitic and austenitic-ferritic (duplex) stainless steels with specific inspection requirements; German version EN 10253-4:2008— 110 стр.