... Application . For ordinary structure, auto mechanical structure Main Steel Grade. 1020,1045,1541,E275, Seamless Steel Pipe Standard GB/T8162---------National StandardASTM A519 ... StandardJIS G3445--------JIS Standard Application For ordinary structure, auto mechanical structureMain Steel Grade10,20,35,45,16Mn,1020,1045,1541,E275,E315 ...