RCS round cornered square steel bar Size:60*60mm,90*90mm,100*100mm,130*130mm,etc Grade:SAE1045,S45C,41Cr4,SAE5140,SAE4140,SUP9 RCS round cornered square steel barSize:60*60mm,90*90mm,100*100mm,130*130mm,etcGrade:SAE1045,S45C,41Cr4,SAE5140,SAE4140,SUP9,etcGrade:carbon steel,alloy steelFinish: Hot Roll (HR),LF,VDInquire about special shapes and grade.