Jul 16 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Introduction
Cold-work tool steels belong to the family of high carbon steels that are further classified into oil-hardening steels, high-carbon, high-chromium steels, and air-hardening steels. Oil-hardening cold-work steels are also known as group O steels consisting of O1, O2, O6, and O7 types.
The following datasheet provides details about the O2 type steels. The O2 oil-hardening cold-work steel is alloyed with manganese.
Chemical Composition
The following table shows the chemical composition of O2 tools steels.
|
Element |
Content (%) |
|
Manganese, Mn |
1.40-1.80 |
|
Carbon, C |
0.85-0.95 |
|
Silicon, Si |
0.5 |
|
Chromium, Cr |
0.35 |
|
Nickel, Ni |
0.3 |
|
Molybdenum, Mo |
0.3 |
|
Vanadium, V |
0.3 |
|
Copper, Cu |
0.25 |
|
Phosphorus, P |
0.03 |
|
Sulfur,S |
0.03 |
Physical Properties
The physical properties of O2 tool steels are outlined in the following table.
|
Properties |
Conditions |
|
T (°C) |
Treatment |
|
Density |
7.66 x 1000 kg/m3 |
25 |
- |
Mechanical Properties
The mechanical properties of O2 steels are tabulated below.
|
Properties |
Conditions |
|
T (°C) |
Treatment |
|
Poisson's ratio |
0.27-0.30 |
25 |
- |
|
Elastic modulus |
27557-30458 ksi |
25 |
- |
Thermal Properties
The table below shows the thermal properties of O2 tool steels.
|
Properties |
Conditions |
|
T (°C) |
Treatment |
|
Thermal expansion |
11.2 x 10-6/ºC |
20-100 |
- |
Other Designations
Other designations that are equivalent to O2 tool steels include:
-
ASTM A681
-
DIN 1.2842
-
SAE J437
-
SAE J438
-
UNS T31502
-
AFNOR 90 MV 8
-
UNI 88 Mn V 8 KU
-
B.S. Bo 2
-
FED QQ-T-570