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The carbon content of this steel is above 0.4%, and it has excellent wear resistance, but its ductility is reduced, and it is easy to deform and crack after quenching. Therefore, heat treatment is extremely important, and it must be cooled quickly after tempering to avoid temper brittleness. The wire cutting performance of this type of carbon steel can be improved by spheroidizing the steel. C 0.42~0.48Si 0.15~0.35Mn 0.60~0.90P≤0.030S≤0.035Cu≤0.30Ni≤0.20Cr≤0.20 is a medium carbon high-quality steel with higher strength. Due to poor hardenability, it is generally used in the normalized state. , when the mechanical performance requirements are high, quenching and tempering treatment is used. The cold deformation plasticity is medium, and the machinability of annealing and normalizing is better than that of quenching and tempering.
It is used to manufacture parts with high strength requirements, such as gears, shafts, piston pins, etc., as well as machined parts, forgings, stamping parts, bolts, nuts, and pipe joints that are not subject to great stress. Our country’s GB/JB standard steel number is 45 German DIN standard material number 1.0503, French AFNOR standard steel number CC45 French NF standard steel number C45 Italian UNI standard steel number C45 Belgian NBN standard steel number C45-1 Swedish SS standard steel number 1650 Spain UNE standard steel number F.114 American AISI/SAE standard steel number 1045 International Organization for Standardization ISO standard steel number C45E4 Japanese JIS standard steel number S45C/S48C British BS standard steel number IC45/080A47.
Quenching and tempering specifications: Quenching temperature is 820℃~870℃, water-cooled, tempering temperature is 550~650℃, and it is extremely cold when it comes out of the furnace. Tensile strength σb (MPa): ≥600 (61) Yield strength σs (MPa): ≥355 (36) Elongation δ5 (%): ≥16 Sectional shrinkage ψ (%): ≥40 Impact energy Akv (J ): ≥39 Impact toughness value αkv (J/cm2): ≥49 (5) Hardness: not heat treated, ≤229HB; annealed steel, ≤197HB45C is widely used in machinery parts manufacturing. This steel has very good mechanical properties. However, this is a medium carbon steel and its quenching performance is not good. No. 45 steel can be hardened to HRC42~46.
Therefore, if surface hardness is required and the superior mechanical properties of 45# steel are needed, the surface of 45# steel is often carburized and quenched, so that the required surface hardness can be obtained. Supply status hardness: 137~170HBS, 167~229HBS, 201~269HBS
Link to this article：What is S45C steel? What are the application ranges of S45C steel?
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