1.Hot rolled/black surface/annealing,hardness:160~210HBS 2.UL test standards:SEP1921-84,GR3 CLASS C/C Carbon steel plate (SAE1045/S45C)features:1).Delivery condition:Hot rolled ;Black Surface;Annealing;Hardness:HBS=160-2102).Chemicial composition:C=0.42~0.5,Si=0.17~0.37,Mn=0.5~0.8,P≤0.035,S≤0.035,Cr≤0.25,Ni≤0.25.3).Specification:Thickness:20/25/30/35...460mm;Width:205/210/....2200mm:Length:2000~ ...