AISI 6145 Alloy Steel (UNS G61450)

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

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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

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