NF A49-142:1987
钢管.特种交货条件的光端非合金钢纵向焊接钢管(D小于或等于168.3mm)(尺寸.交货技术条件.)
Steel tubes. Longitudinally pressure welded plain ended and hot finished tubes. Diameters from 13,5 to 168,3 mm with specified room temperature properties and with special delivery conditions. Dimensions. Technical delivery conditions.