hot rolled square steel bars Diameter:12mm to 300mm Grade:SS400,Q235,SAE1045,S45C,45#,41Cr4,SAE5140,SCM440,42CrMo4,SAE4140,etc hot rolled square steel barsDiameter:12mm to 300mmGrade:SS400,Q235,SAE1045,S45C,45#,41Cr4,SAE5140,SCM440,42CrMo4,SAE4140,etc hot rolled alloy round steel bars