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  • Alloy
4140

4140 Product Guide

Applications | Specifications | Mechanical and Chemical Data | Tolerances

Overview

This alloy has high strength, high fatigue strength, toughness, torsional strength, and impact and abrasion resistance. Additionally, 4140 steel is highly ductile when annealed, though it requires more pressure as it is tougher than most carbon steels. 4140 is easily welded, but if this is done after hardening, it will also require a post weld heat treatment. This material is typically used in aerospace, oil, gas, automotive, agricultural, and defense industries, specifically gears, shafts, spindles, fixtures, and collars.

 

Common Trade Names

UNS G41400, AISI 4140, C4140, Alloy Steel



Other Resources

Weight Calculator | Mill Test Reports

Products

4140 Sheet/Plate | 4140 Round Bar | Round Tube 4140 Metric


Applications

  • Aerospace
  • Oil & Gas industrial parts
  • Automotive
  • Agriculture
  • Defense Industry
  • Gears
  • Shafts

Specifications

ASTM

A108



Physical Properties 4140
 
Annealed
Density 0.283 lb/in3
Ultimate Tensile Strength 95 ksi
Yield Tensile Strength 60.2 ksi
Shear Strength 69 ksi
Hardness Rockwell | Brinell B92 | 197
Elongation at Break Percentage 25.7%
Modulus of Elasticity 29,700 ksi
Reduction of Area Percentage 56.9%
Melting Point 2,580-2,650 °F
Specific Heat 1.13 x 10^-1 BTU/lb-°F
Thermal Conductivity 296 BTU-in/hr-ft^2-°F


Chemistry Information
Element
Percentage
C 0.38 - 0.43
Cr 0.8 - 1.1
Fe 96.785 - 97.84
Mn 0.7 - 1
Mo 0.15 - 0.25
P 0.035 max
S 0.04 max
Si 0.15 - 0.3
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