... . For ordinary structure, auto mechanical structure Main Steel Grade. 1020,1045,1541,E275, Seamless Steel Pipe Standard GB/T8162---------National StandardASTM A519--------ASTMEN ... G3445--------JIS Standard Application For ordinary structure, auto mechanical structureMain Steel Grade10,20,35,45,16Mn,1020,1045,1541,E275,E315 ... ≤0.25≤0.35≤0.60≤0.040//// LASW PIPE API 5L PSL2 X60 ERW PIPE API 5L PSL2 X60