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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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