Jun 18 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat Treatment
Machinability
Welding
Cold Working
Hardening
Tempering
Applications
Introduction
Alloy steel is steel alloyed with various elements in total amounts between 1 and 50% by weight to improve its mechanical properties including wear resistance, toughness, hardness and strength. It is subdivided into two groups namely low alloy steel and high alloy steel. The very low-alloy steels within this group are generally high strength structural steels with a total alloy content of up to 2%.
AISI 6150 alloy steel is heat treatable alloy known for its toughness and high strength in the heat treated condition. The following datasheet will discuss in detail about AISI 6145 alloy steel.
Chemical Composition
The chemical composition AISI 6145 alloy steels is outlined in the following table.
|
Element |
Content (%) |
|
Chromium, Cr |
0.8-1.1 |
|
Manganese, Mn |
≤0.7-0.9 |
|
Carbon, C |
≤0.43-0.48 |
|
Silicon, Si |
≤0.2-0.35 |
|
Vanadium, V |
≥0.15 |
|
Phosphorus, P |
≤0.04 |
|
Sulfur, S |
≤0.05 |
Physical Properties
The following table shows the physical properties of AISI 6145 alloy steels.
|
Properties |
Metric |
Imperial |
|
Density |
7.75 g/cm3 |
0.280 lb/in3 |
Mechanical Properties
The mechanical properties of AISI 6145 alloy steels are displayed in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
1213 MPa |
175900 psi |
|
Yield strength (@0.2%) |
1165 MPa |
169000 psi |
|
Modulus of elasticity |
201-209 GPa |
29200-30300 ksi |
|
Bulk modulus |
160-170 GPa |
23200-24700 ksi |
|
Shear modulus |
81-82 GPa |
11700-11900 ksi |
|
Poisson’s ratio |
0.27-030 |
0.27-030 |
|
Elongation at break |
16% |
16% |
|
Hardness, Brinell |
429 |
429 |
Thermal Properties
The thermal properties of AISI 6145 alloy 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 |
Fabrication and Heat Treatment
Machinability
Machining of AISI 6145 alloy steel can be performed by all conventional methods.
Welding
AISI 6145 alloy steel can be welded using fusion or resistance welding methods. However, preheat and post-heat welding procedures need to be followed before welding this alloy steel.
Cold Working
AISI 6145 can be cold worked in the annealed condition by conventional methods.
Hardening
AISI 6145 can be hardened at a temperature of 820-860°C (1508-1580°F) followed by oil quenching.
Tempering
Tempering of AISI 6145 can be performed at 540-680°C (1004-1256°F).
Applications
The following are the list of applications of AISI 6145 alloy steels:
-
Torsion springs and springs for trucks
-
Engine and vehicle parts
-
Permanently stressed machine