NF A49-240:1983 Steel tube longitudinally buttwelding plain end for pressure vessels and pipe systems used at low temperatures. Dimensions. Technical conditions of delivery.
2002NF A49-201-4:2002 Welded steel tubes for pressure purposes - Technical delivery conditions - Part 4 : electric welded non-alloy steel tubes with specified low temperature properties.
1983NF A49-240:1983 Steel tube longitudinally buttwelding plain end for pressure vessels and pipe systems used at low temperatures. Dimensions. Technical conditions of delivery.