The purpose of this standard is to fix the dimensions in millimeters? and the technical conditions for delivery of longitudinally welded square and rectangular tubes in non-alloy steel, made from cold-rolled flat products. These tubes are commonly used in various mechanical and construction industries, for example: furniture, automotive, locksmithing, etc.
NT 26.03-1983 history
1984NT 26.03-1983 Square and rectangular steel pipes are designed to be formed during high temperature rolling