carbon steel bars Grade:Q235,20#,45#,SS400,S45C,S20C,SAE1022,SAE1045,etc steel bars|:ProcessingProductsSpecificationGradeStandardHotrolledsteelRound barDia 12mm to 300mmSS400,Fe360,C22-C80,41Cr4,SAE5140, ... ,SAE5140,SAE4140,SUJ2,SUP9,etcGB, DIN, JIS, ASTM deformated structral steel bars