AISI 4027 Alloy Steel (UNS G40270)

Sep 27 2012

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations

Introduction

Alloy steels comprise a wide range of steels with compositions that exceed the limitations of Si, Va, Cr, Ni, Mo, Mn, B and C allocated for carbon steels. In comparison with carbon steels, alloy steels are more responsive to mechanical and heat treatments.

Alloy steels have elements such as chromium, cobalt, nickel, etc. These steels can be used in specific melting and deoxidization processes for particular applications.

The following datasheet provides an overview of AISI 4027 alloy steel.

Chemical Composition

The chemical composition of AISI 4027 alloy steel is outlined in the following table.

Element Content (%)
Iron, Fe 98.08-98.7
Manganese, Mn 0.70-0.90
Carbon, C 0.25-0.30
Molybdenum, Mo 0.20-0.30
Silicon, Si 0.15-0.35
Sulfur, S 0.040
Phosphorous, P 0.035

Physical Properties

The following table shows the physical properties of AISI 4027 alloy steel.

Properties Metric Imperial
Density 7.85 g/cm3 0.284 lb/in³

Mechanical Properties

The mechanical properties of annealed AISI 4027 alloy steel are displayed in the following table.

Properties Metric Imperial
Tensile strength 515 MPa 74700 psi
Yield strength 325 MPa 47100 psi
Bulk modulus (typical for steel) 140 GPa 20300 ksi
Shear modulus (typical for steel) 80.0 GPa 11600 ksi
Elastic modulus 190-210 GPa 27557-30458 ksi
Poisson's ratio 0.27-0.30 0.27-0.30
Elongation at break (in 50 mm) 30.00% 30.00%
Reduction of area 52.90% 52.90%
Hardness, Brinell 143 143
Hardness, Knoop (converted from Brinell hardness) 163 163
Hardness, Rockwell B (converted from Brinell hardness) 78 78
Hardness, Vickers (converted from Brinell hardness) 149 149
Machinability (annealed and cold drawn. Based on 100 machinability for AISI 1212 steel) 70 70

Thermal Properties

The thermal properties of AISI 4027 alloy steel are given in the following table.

Properties Metric Imperial
Thermal conductivity (typical steel) 44.5 W/mK 309 BTU in/hr.ft².°F

Other Designations

Equivalent materials to AISI 4027 alloy steel are:

  • ASTM A322
  • ASTM A331
  • ASTM A519
  • SAE J404
  • SAE J412
  • SAE J770

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