Aisi 1045 steel, sae 1045 material Chemical composition of sae 1045 material Grade c% mn% si% p% s% S45c 0.42~0.48 0.6~0.9 0.15~0.35 â?¤0.030 â?¤0.030 Equivalent grade: Chinese american german japanese Gb aisi din jis 45# 1045 1.1191 s45c Available sizes Round: dia. 60â?? 300mm Plate: thickness 16 â?? 300mm, width 60- 520mm Delivery condition: hot rolled or forged peeled or black surface, annealed or no heat treatment. Properties: A medium carbon steel is used when greater strength and hardness is desired than in the â??as rolledâ? condition. Extreme size accuracy, straightness and concentricity combine to minimize wear in high speed applications. Turned ground and polished. Applications: Component parts for vehicles, shafts, bushings, crankshafts, connecting rods and parts for the machine building industry and steel for axes, knives, hammers etc.