Jun 19 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Applications
Introduction
Tool steels are a type of carbon and alloy steels that are used for tool manufacturing applications. They have resistance to abrasion and deformation at elevated temperatures, distinct hardness and an ability to hold a cutting edge.
AISI T7 tool steel acquires high strength, toughness and the ability to withstand vibration and shock when quenched and tempered.
The data below will provide an overview of grade T7 tool steels.
Chemical Composition
The chemical composition of T7 tool steels is outlined in the following table.
| Element |
Content (%) |
| Tungsten, W |
13.5-14.5 |
| Chromium, Cr |
4.5-5 |
| Vanadium, V |
1.5-1.8 |
| Carbon, C |
≤ 0.7-0.75 |
| Silicon, Si |
≤ 0.2-0.4 |
| Manganese, Mn |
≤ 0.2-0.4 |
Physical Properties
The following table shows the physical properties of T7 tool steels.
| Properties |
Metric |
Imperial |
| Density |
7.7 g/cm3 |
0.278 lb/in3 |
| Melting point |
1450 – 1510°C |
2642 – 2750°F |
Mechanical Properties
The mechanical properties of T7 tool steels are displayed in the following table.
| Properties |
Metric |
Imperial |
| Tensile strength |
650-880 MPa |
94274 -127663psi |
| Yield strength |
350-550 MPa |
50763 - 79770 |
| Young’s modulus |
200000 MPa |
29007.5 ksi |
| Elongation at break |
8-25% |
8-25% |
Thermal Properties
The thermal properties of T7 tool steels are given in the following table
| Properties |
Metric |
Imperial |
| Thermal expansion co-efficient |
10 µm/m°C |
5.5 µin/in°F |
| Thermal conductivity |
25 W/mK |
173.3 BTU.in/hrft².°F |
Applications
The following are the list of applications of T7 tool steels:
- Chisels
- Small pneumatic tools
- Forging die
- Rivets
- Carpenter saws
- Metal scissors.