Jul 10 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Introduction
Tungsten is a good carbide former that increases temperature and red hardness, prevents gain growth and improves toughness. It is a steel gray metal used in high speed steels and hot forming tool steels.
Tungsten high speed tool steels or group T steels range from T1 to T15 steels. This article on the tool steel type T15 will focus on the chemical composition, physical, mechanical, and thermal properties, and other designations of T15 tool steels.
Chemical Composition
The chemical composition of T15 tool steels is outlined in the following table.
|
Element |
Content (%) |
|
Tungsten, W |
11.75-13 |
|
Cobalt, Co |
4.75-5.25 |
|
Vanadium, V |
4.50-5.25 |
|
Chromium, Cr |
3.75-5 |
|
Carbon, C |
1.50-1.60 |
|
Molybdenum, Mo |
1 (max) |
|
Nickel, Ni |
0.3 |
|
Copper, Cu |
0.25 |
|
Manganese, Mn |
0.15-0.40 |
|
Silicon, Si |
0.15-0.40 |
|
Phosphorus, P |
0.03 |
|
Sulfur, S |
0.03 |
Physical Properties
The table below shows the physical properties of T15 tool steels.
|
Properties |
Metric |
Imperial |
|
Density |
8.19 g/cm3 |
0.295 lb/in3 |
Mechanical Properties
The mechanical properties of T15 tool steels are displayed in the following table.
|
Properties |
Metric |
Imperial |
|
Poisson's ratio |
0.27-0.30 |
0.27-0.30 |
|
Elastic modulus |
190-210 GPa |
27557-30457 Ksi |
|
Izod impact unnotched |
27.1 - 46.1 J |
20.0 - 34.0 ft.lb |
|
Abrasion (loss in mm3, tempered at 1025°F; ASTM G65 ) |
8 |
8 |
|
Abrasion (loss in mm3, tempered at 1275°F; ASTM G65 ) |
32.3 |
32.3 |
|
Hardness, Rockwell C (tempered at 1275°F) |
46.5 |
46.5 |
|
Hardness, Rockwell C (tempered at 1025°F) |
67.5 |
67.5 |
Thermal Properties
The table below outlines the thermal properties of T15 tool steels.
|
Properties |
Conditions |
|
T (ºC) |
Treatment |
|
Thermal expansion |
9.9 x 10-6/ºC |
20-200 |
- |
|
Thermal conductivity |
20.9 x W/m-K |
100 |
- |
Other Designations
Equivalent materials to T15 tool steels are:
-
DIN 1.3202
-
UNI 130505 KU
-
B.S. BT 15
-
ASTM A600
-
FED QQ-T-590
-
UNS T12001
-
UNS T12015
-
DIN 1.3202