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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 |
