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AISI 6150 Alloy Steel (UNS G61500)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
     Machinability
     Welding
     Heat Treatment
     Forging
     Annealing
Applications

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:

  • Shafts
  • Gears
  • Pinions

Date Added: Sep 6, 2012 | Updated: Jul 13, 2013
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