Sep 11 2012
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Introduction
The AISI classifies chromium hot-work tool steels as group H steels, ranging from H1 to H19.
H10 Chromium hot-work steel has excellent resistance to softening at high temperatures. This particular grade is resisitant to thermal fatigue cracking and can be cooled in water for servicing.
Typical applications included hot punches, die castings dies, forging dies and extrusion tooling.
This article will discuss about H10 chromium hot-work steels in detail.
Chemical Composition
The following table shows the chemical composition of H10 tool steels.
| Element |
Content (%) |
| C |
0.35-0.45 |
| Mn |
0.25-0.70 |
| Si |
0.80-1.20 |
| Cr |
3.00-3.75 |
| Ni |
0.3 |
| Mo |
2.00-3.00 |
| V |
0.25-0.75 |
| Cu |
0.25 |
| P |
0.03 |
| S |
0.03 |
Physical Properties
The physical properties of H10 tool steels are given in the following table.
| Properties |
Metric |
Imperial |
| Density |
7.77 g/cm3 |
0.281 lb/in3 |
Mechanical Properties
The mechanical properties of H10 tool steels are tabulated below.
| Properties |
Metric |
Imperial |
| Hardness, Rockwell C (air cooled from 1024°C and double tempered; 649°C temper temperature) |
41 |
41 |
| Hardness, Rockwell C (air cooled from 1024°C and double tempered;149°C temper temperature) |
58 |
58 |
| Modulus of elasticity |
207 GPa |
30000 ksi |
| Machinability (1% carbon steel) |
90.0 - 95.0% |
90.0 - 95.0% |
| Poisson's ratio |
0.27-0.30 |
0.27-0.30 |
Thermal Properties
The following table shows the thermal properties of H10 tool steels.
| Properties |
Metric |
Imperial |
| Maximum service temperature, air |
482°C |
900°F |
Other Designations
Other designations that are equivalent to H10 tool steels include:
- AFNOR 32 DCV 28
- DIN 1.2365
- ASTM A681
- FED QQ-T-570
- UNS T20810