s45c material 1045 alloy steel plate 1.Specifications of ASTM Steel Plate Round bar Diameter(mm) Length (mm) 20~800 3000~5800 Plate Thickness(mm) Width (mm) Length (mm) Max:800 1600~2300 3000~5800 2.Chemical compositon(%) Standard Number C Si Mn Cr Ni Cu S P GB 45# 0.42~0.50 0.17~0.37 0.5~0.8