... Seamless Steel Pipe Application . For ordinary structure, auto mechanical structure Main Steel Grade. 1020,1045,1541,E275 ... StandardJIS G3445--------JIS Standard Application For ordinary structure, auto mechanical structureMain Steel Grade10,20,35,45,16Mn, ... ,E275,E315,34CrMo4,42CrMo4,STKM13A,STKM13B etc. Mechanical PropertiesStandardSteel GradeChemical CompositionCSiMnP,SCuNiMoCrGB/T8162100.07~0.140 ...