Alloy Steel AISI 8740 | UNS# G87400 is similar to AISI 4140 and is generally used for aircraft fasteners and engine bolts, piston rods, axles, tool joints, and other applications where strength, toughness, and wear resistance are top priorities. As a nickel-chromium-molybdenum low-alloy steel, AISI 8740 demonstrates high tensile strength, good yield strength, fatigue resistance, toughness, and wear resistance properties.
Alloy Steel AISI 8740 Specifications:
Alloy Steel AISI 8740 product forms offered at all Titanium Industries’ locations:
Alloy Steel AISI 8740 Applications:
- Aerospace Fasteners
- Automotive
- Petrochemical
- Waste Processing
- Marine
- Defense
- Pharmaceutical
DISCLAIMER: Alloy data sheets are for reference only, not for design purposes.
| Chemical Composition | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| C 0.43% Max | Cr 0.40 – 0.60% | Fe 96.65 – 97.72% | Mn 0.72 – 1.0% | Mo 0.20 – 0.30% | |||||
| Ni 0.40 – 0.70% | P 0.035% Max | Si 0.15 – 0.30% | S 0.040% Max | ||||||
| PHYSICAL PROPERTIES | ||||||
|---|---|---|---|---|---|---|
| Density | Electrical conductivity (% IACS) | Thermal conductivity (BTU-in/hr-ft²-°F) | Specific heat capacity | Thermal expansion (1/°F) | Melting Point (°F) | |
| 0.284 | – | 323 | 0.114 | – | – | |
| Mechanical Properties | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Property | Minimum | Maximum | |||||||
| Yield Strength Range (Rp0.2 Offset) (ksi) | – | – | |||||||
| Tensile Strength Range (Rm) (ksi) | – | – | |||||||
| Elongation (AL=5 x Ø) | 16% | – | |||||||
| Brinell Hardness (H) | 269 | 269 | |||||||
| Modulus of Elasticity (ksi) (E): 29700 | |||||||||
| Machineability General Index: 65% | |||||||||
T.I. Approvals:
Plus a wide range of approvals from most leading OEM’s across Aerospace, Medical, Industrial, and Oil and Gas markets.