T8Mn(A) ‌/SK5/C85W ‌/060A81 ‌/Y75 ‌

Chemical composition (average value, unit:%)

• Main elements:

Carbon (C) 0.80-0.90%, silicon (Si) 0.10-0.35%, manganese (Mn) 0.10-0.50%, sulfur (S) ≤ 0.030%, phosphorus (P) ≤ 0.030%.

• Residual elements:

Chromium (Cr) ≤ 0.25% (≤ 0.10% during lead bath quenching of steel wire), nickel (Ni) ≤ 0.20% (≤ 0.12% during lead bath quenching), copper (Cu) ≤ 0.30% (≤ 0.20% during lead bath quenching).

• Restriction condition:

The total amount of Cr+Ni+Cu in the production of lead bath quenched steel wire is ≤ 0.40%.

physical property 

• Hardness:

The hardness in annealed state is ≤ 187HB (indentation diameter ≥ 4.40mm), and the hardness after quenching is ≥ 62HRC.

• Heat treatment specifications:

The quenching temperature is 780-820 ℃ (water-cooled), the starting temperature for hot working is 1000-1050 ℃, and the ending temperature is 850 ℃.

• Characteristics:

High hardness, wear resistance, but low thermal hardening, poor hardenability, easy deformation, low plasticity and strength.

Main purpose

• Applicable scenarios:

Manufacturing low complexity tools such as simple shaped molds, punches, metal cutting tools, drilling tools, woodworking milling cutters, axes and chisels, and hand saws.

• Restricted applications:

Not suitable for high temperature environments or precision components that require high hardenability and deformation resistance, as they are prone to deformation and have limited strength after heat treatment.

Supplementary explanation

Although SK5 has the typical high hardness and wear resistance of high carbon steel, its material properties are limited by the basic characteristics of its carbon tool steel, and its applicability needs to be evaluated based on specific working conditions. If you need to compare with other national standard steels, it is recommended to further consult the international material comparison database or contact suppliers for detailed data.