The technical delivery conditions for alloyed and non-alloyed butt weld steel fittings are enveloped by standard DIN 2609. Typically, one type of alloy steel used in the manufacture of DIN 2609 Buttwelding fittings is carbon steel. Most carbon steel grades are valued for their elevated hardness properties and for their lower than most alloys cost. Since carbon steels are basically un-alloyed, most manufacturers gain a lot by using DIN 2609 Carbon Steel Pipe Fittings .