... grade: 20#, 45#, Q235, 40Cr,27SiMn, 37Mn5,ect. steel round bar size: 28-150mm grade: 20#, 45#, Q235, ... 40Cr,27SiMn, 37Mn5,ect. (1) Grade: Round Steel Bar 1045/ 45#/ S45CB(2) Chemical composition %CSiMnCrNiCu0.42-0 ... strength(MPa)Yield point(MPa)Elongation %Reductionstretch %Ballistic work(J)≥600≥355≥16≥39≥40(4) Diameter: 28mm ... treatment(8) Application: Free cutting or Forging steel round bar