Jun 20 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Applications
Introduction
Tool steels are high quality steels developed with controlled chemical composition to form properties essential for working and shaping of other materials. They are normally delivered to the suppliers in the soft annealed condition, which makes it easy for the manufacturer to machine the material with cutting tool for different applications.
AISI T8 tool steel is a tungsten-cobalt-vanadium high-speed tool steel. The following datasheet will provide an overview of grade T8 tool steels.
Chemical Composition
The chemical composition of T8 tool steels is outlined in the following table.
Element |
Content (%) |
Tungsten, W |
13.25-14.75 |
Cobalt, Co |
4.25-5.75 |
Chromium, Cr |
3.75-4.5 |
Vanadium, V |
1.80-2.40 |
Carbon, C |
0.75-0.85 |
Molybdenum, Mo |
0.4-1 |
Nickel, Ni |
0.3 |
Copper, Cu |
0.25 |
Manganese, Mn |
0.2-0.4 |
Silicon, Si |
0.2-0.4 |
Phosphorus, P |
0.03 |
Sulfur, S |
0.03 |
Physical Properties
The following table shows the physical properties of T8 tool steels.
Properties |
Metric |
Imperial |
Density |
8.43 g/cm3 |
0.267 lb/in3 |
Mechanical Properties
The mechanical properties of T8 tool steels are displayed in the following table.
Properties |
Metric |
Imperial |
Tensile strength |
1158 MPa |
167.95 ksi |
Elongation |
15% |
15% |
Modulus of elasticity |
190-210 GPa |
27557- 30457 ksi |
Poisson’s ratio |
0.27-0.3 |
0.27-0.3 |
Thermal Properties
The thermal properties of T8 tool steels are given in the following table
Properties |
Metric |
Imperial |
Thermal expansion co-efficient |
16-17 µm/m°C |
8.8-9.4 µin/in°F |
Thermal conductivity |
16 W/mK |
110 BTU.in/hrft².°F |
Other Designations
The equivalent materials to T8 tool steels include the following:
-
ASTM A600
-
FED QQ-T-590
-
SAE J437
-
SAE J438
Applications
The following are the list of applications of T8 tool steels:
-
Drills
-
Planer tools
-
Cutoff tools
-
Roll-turning tools
-
Lathe tools.