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C60R

C60R is a non-alloy steel with many excellent properties and a wide range of applications. It is a type of carbon spring steel with excellent metallurgical quality (high coating degree and uniformity) and good surface quality (strict control of surface defects and demoulding). After heat treatment or cold drawing heat treatment, C60R obtains extremely high strength, hardness, elasticity and appropriate toughness and plasticity. With the same surface condition and complete hardening, C60R is also suitable for tool manufacturing, showing its applicability in tool and mold manufacturing. This strength and range of applications make it one of the most important materials in industry.
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CHEMICAL COMPOSITION

C: 0.57-0.65

Si: ≤0.40

Mn: 0.60-0.90

P: ≤0.035

S: 0.020-0.040

Cr: ≤ 0.40

Ni: ≤ 0.40

Mo: ≤ 0.10

Cr+Ni+Mo: ≤ 0.63


MECHANICAL PROPERTIES

Young's modulus: 200000MPa

Tensile strength: 650-880MPa

Elongation: 8-25%

Fatigue: 275MPa

Yield strength: 350-550MPa



HEAT TREATMENT

Soft Annealing:Heat to 650-700oC, cool slowly in furnace. This will produce a maximum Brinell hardness of 241.


Normalizing:Normalizing temperature: 820-850oC.


Hardening:Harden from a temperature of 800-830oC, 810-840oC followed by water or oil quenching.


Tempering:Tempering temperature: 540-680oC.


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