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Chemical Composition

The following table shows the chemical composition of JIS SKD61 tool steels.

Element Content (%)
Chromium, Cr 4.75-5.50
Molybdenum, Mo 1.10-1.75
Silicon, Si 0.80-1.20
Vanadium, V 0.80-1.20
Carbon, C 0.32-0.45
Nickel, Ni 0.3
Copper, Cu 0.25
Manganese, Mn 0.20-0.50
Phosphorus, P 0.03
Sulfur, S 0.03

Physical Properties

The physical properties of JIS SKD61 tool steels are given in the following table.

Properties Metric Imperial
Density (@20°C/68°F) 7.80 g/cm3 0.282 lb/in3
Melting point 1427°C 2600°F

Mechanical Properties

The mechanical properties of JIS SKD61 tool steels are tabulated below.

Properties Metric Imperial
Tensile strength, ultimate (@20°C/68°F, varies with heat treatment) 1200 - 1590 MPa 174000 - 231000 psi
Tensile strength, yield (@20°C/68°F, varies with heat treatment) 1000 - 1380 MPa 145000 - 200000 psi
Reduction of area (@20°C/68°F) 50.00% 50.00%
Modulus of elasticity (@20°C/68°F) 215 GPa 31200 ksi
Poisson's ratio 0.27-0.30 0.27-0.30

Thermal Properties

The following table shows the thermal properties of JIS SKD61 tool steels.

Properties Conditions
T (ºC) Treatment
Thermal expansion 10.4 x 10-6/ºC 20-100 -
Thermal conductivity 28.6 W/mK 215