Sep 13 2012
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesThermal PropertiesOther DesignationsFabrication and Heat Treatment Machinability Welding Heat Treatment Forging AnnealingApplications
Introduction
Alloy steels are designated by AISI four-digit numbers. They are more susceptible to mechanical and heat treatments than carbon steels. They comprise different types of steels with compositions which exceed the limitations of B, C, Mn, Mo, Ni, Si, Cr, and Va in the carbon steels.
The datasheet given below provides more details about AISI 6150 alloy steel.
Chemical Composition
The chemical composition of AISI 6150 alloy steel is listed in the following table.
| Element |
Content (%) |
| Iron, Fe |
97.095 - 97.72 |
| Chromium, Cr |
0.800 - 1.10 |
| Manganese, Mn |
0.7 - 0.9 |
| Carbon, C |
0.480 - 0.530 |
| Silicon, Si |
0.150 - 0.3 |
| Vanadium, V |
≥ 0.150 |
| Sulfur, S |
≤ 0.04 |
| Phosphorous, P |
≤ 0.0350 |
Physical Properties
The following table shows the physical properties of AISI 6150 alloy steel.
| Properties |
Metric |
Imperial |
| Density |
7.85 g/cm3 |
0.284 lb/in³ |
Mechanical Properties
The mechanical properties of AISI 6150 alloy steel are outlined in the following table.
| Properties |
Metric |
Imperial |
| Tensile strength, ultimate |
670 MPa |
97200 psi |
| Tensile strength, yield |
415 MPa |
60200 psi |
| Izod impact |
27 J |
19.9 ft-lb |
| Modulus of elasticity |
190-210 GPa |
27557-30458 ksi |
| Shear modulus (typical for steel) |
80 GPa |
11600 ksi |
| Bulk modulus (typical for steel) |
140 GPa |
20300 ksi |
| Poissons ratio (calculated) |
0.27 – 0.30 |
0.27-0.30 |
| Elongation at break (in 50 mm) |
23% |
23% |
| Hardness, Brinell |
197 |
197 |
| Hardness, Vickers (converted from Brinell hardness) |
207 |
207 |
| Hardness, Knoop (converted from Brinell hardness) |
219 |
219 |
| Hardness, Rockwell B (converted from Brinell hardness) |
92 |
92 |
| Hardness, Rockwell C (converted from Brinell hardness, value below normal HRC range, for comparison purposes only) |
13 |
13 |
| Machinability (annealed and cold drawn. Based on 100% machinability for AISI 1212 steel) |
55 |
55 |
Thermal Properties
The thermal properties of AISI 6150 alloy steel are outlined in the following table.
| Properties |
Metric |
Imperial |
| Thermal conductivity |
46.6 W/mK |
323 BTU in/hr.ft2. °F |
Other Designations
Other designations that are equivalent to AISI 6150 alloy steel include the following.
| AMS 6448 |
AMS 6455C |
ASTM A519 (6150) |
SAE J404 (6150) |
SS 2230 |
| AMS 6448C |
AMS 7301 |
ASTM A752 (6150) |
SAE J412 (6150) |
B.S. 735 A 50 |
| AMS 6450 |
ASTM A29 (6150) |
ASTM A829 |
AFNOR 50 CV 4 |
B.S. En. 47 |
| AMS 6450C |
ASTM A322 (6150) |
MIL S-8503 |
DIN 1.8159 |
|
| AMS 6455 |
ASTM A331 (6150) |
SAE J1397 (6150) |
UNI 5OCrV 4 |
|
Fabrication and Heat Treatment
Machinability
The machinability rating of 6150 alloy steel is 59.
Welding
AISI 6150 alloy steel can be welded using any common welding methods. However, preheating and post weld stress relieving have to performed for welding this steel.
Heat Treatment
AISI 6150 alloy steel is hardened at 871°C (1600°F). This steel is tempered followed by normalizing at 899°C (1650°F) and then air cooled.
Forging
Forging of 6150 alloy steel is performed at 1204°C (2200°F).
Annealing
AISI 6150 alloy steel is annealed at 843°C (1550°F) and then air cooled.
Applications
The following are the major applications of 6150 alloy steel: