S45C Steel Plate

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S45C steel is a fully static steel manufactured by the electric furnace, open hearth or pure oxygen converter steelmaking method. The steel has a uniform metallographic structure and no structural defects
The steel contains more than 0.4% carbon and has excellent wear resistance, but its ductility is reduced, and it is easy to deform and crack during quenching. Therefore, heat treatment is extremely important and must be quenched after tempering to avoid temper brittleness. By spheroidizing the steel, the cutting performance of this type of carbon steel can be improved.

Chemical composition:
C 0.42~0.48
Si 0.15~0.35
Mn 0.60~0.90

Mechanical propertiesedit
Tensile strength σb (MPa): ≥600 (61)
Yield strength σs (MPa): ≥355 (36)
Elongation δ5 (%): ≥16
Reduction of area ψ (%): ≥40
Impact energy Akv (J): ≥39
Impact toughness value αkv (J/cm2): ≥49 (5)
Hardness: unheated, ≤229HB; annealed steel, ≤197HB

The standard steel Grade of my country’s GB/JB is 45
German DIN standard material number 1.0503,
French AFNOR standard steel number CC45
French NF standard steel number C45
Italy UNI Standard Steel C45
Belgium NBN standard steel number C45-1
Swedish SS standard steel grade 1650
Spain UNE standard steel number F.114
American AISI/SAE Standard Steel No. 1045
International Organization for Standardization ISO Standard Steel Number C45E4
Japanese JIS standard steel number S45C/S48C
British BS standard steel grade IC45/080A47

Heat treatment
Quenching and tempering specifications Quenching temperature 820℃~870℃, water cooling, tempering temperature 550~650℃, extremely cold out of the furnace.

45# steel is widely used in machinery, when not heat-treated: HB≤229; heat-treated: normalizing; impact energy: Aku≥39J; high strength, good plasticity and toughness, 45# steel plate after quenching without tempering, the hardness is greater than HRC55 (Up to HRC62) is qualified. After heat treatment and tempering, it can reach HRC42-46, which not only guarantees its good mechanical properties, but also obtains the surface hardness requirements. It is used to make small section adjustments that can withstand larger loads. Quality parts and large normalized parts with low stress, as well as surface hardened parts that do not require high core strength, such as tips, guide posts, watch hands and other parts.


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