DIN 2609 Grade St 37-0 Tube is made up of a carbon steel or mild steel that is corrosion resistant and strong. The dimensions of the seamless pipes and welded pipes vary. The seamless pipes range from 4mm to 219mm in outer diameter and the welded and Electric Fusion welded pipes range from 5mm to 1219.2mm in outer diameter. The pipes also range from 0.5mm to 20mm in wall thickness.