H-13
H-13 Grade Introduction:
H13 Tool Steel is a versatile chromium-molybdenum hot work steel that is widely used in hot work and cold work tooling applications. The hot hardness (hot strength) of H13 resists thermal fatigue cracking which occurs as a result of cyclic heating and cooling cycles in hot work tooling applications. Because of its excellent combination of high toughness and resistance to thermal fatigue cracking (also known as heat checking) H13 is used for more hot work tooling applications than any other tool steel.
H-13 Grade Application:
- Hot forging and pressing dies
- Extrusion dies
- mandrels and punches
- Hot chisels
- Pressure pads
- Extrusion stems
- Blanking and bending tools
- Hot heading tools
H-13 Equivalent Grades:
| Country |
USA |
German |
Japan |
| Standard |
ASTM A681 |
DIN EN ISO 4957 |
JIS G4404 |
| Grades |
H13 |
1.2344/X40CrMoV5-1 |
SKD61 |
H-13 Chemical Composition:
| Element |
C |
Si |
Mn |
P |
S |
Cr |
Mo |
Ni |
V |
Cu |
| Content (%) |
0.32-0.45 |
0.80-1.20 |
0.20-0.50 |
0.03 |
0.03 |
4.75-5.50 |
1.10-1.75 |
0.30 |
0.80-1.20 |
0.25 |
Mechanical Properties:
| 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 |
Physical Properties:
| Properties |
Metric |
Imperial |
| Density (@20°C/68°F) |
7.80 g/cm3 |
0.282 lb/in3 |
| Melting point |
1427°C |
2600°F |
Thermal Properties:
| Properties |
Values |
T (ºC) |
| Thermal expansion |
10.4 x 10-6/ºC |
20-100 |
| Thermal conductivity |
28.6 W/mK |
215 |
Forging Properties:
H13 tool steels are forged at 1079°C (1975°F). For this type of steels, forging below 898°C (1650°F) is not preferable.
Stress Relieving:
When desirable to relieve the strains of machining, heat slowly to 1050°-1250°F, allow to equalize, and then cool in still air (Strain Relieving)