9310 Alloy Steel - High-Strength Nickel-Chromium-Molybdenum Case Hardening Steel
4340 VAR stands for AISI 4340 alloy steel that is refined using Vacuum Arc Remelting (VAR), a procedure that significantly improves cleanliness, microstructural uniformity, and mechanical reliability. This material is commonly used in aerospace and defense industries and other applications where parts are required to withstand extreme stress and conditions.
Technical Informations of 9310 Alloy Steel
- Carbon (C): 0.08 – 0.13%
- Nickel (Ni): 3.00 – 3.50%
- Chromium (Cr): 1.00 – 1.40%
- Molybdenum (Mo): 0.08 – 0.15%
- Manganese (Mn): 0.45 – 0.65%
- Silicon (Si): 0.20 – 0.35%
- Iron (Fe): Balance
- Excellent carburizing response for case hardening applications
- High fatigue strength under cyclic loading
- Strong core toughness after heat treatment
- Good wear resistance due to hardened case layer
- High hardenability for consistent mechanical properties
Applications of 9310 Alloy Steel
Because of its excellent fatigue resistance and carburizing capability, 9310 alloy steel is widely used in aerospace transmission and mechanical systems where components experience repeated contact stresses.
Typical applications include:
- Aircraft Transmission Gears – heavily loaded drivetrain components
- Helicopter Gearboxes : high-strength gears and pinions
- Aerospace Drive Systems : shafts and rotating components
- High-Performance Mechanical Gears : industrial and aerospace gear assemblies
- Aircraft Mechanical Systems : parts requiring surface hardness and core toughness
9310 Alloy Steel SPECIFICATIONS
BARS & FORGINGS
Semi-finished bars and forged shapes used for aircraft structural parts, landing gear, and high-stress applications.
Certified Material for Critical Service
Aerospace materials must meet strict traceability and certification requirements to ensure consistent performance. Fighter Jet Metals supports projects requiring 9310 alloy steel for aerospace and defense applications.
All supplied materials include:
- Mill Test Reports (MTRs) verifying chemical composition and mechanical properties
- Full heat-lot traceability for aerospace documentation
- Certification confirming compliance with applicable SAE and aerospace material standards
This level of documentation ensures materials can be used confidently in high-performance aircraft systems and precision mechanical assemblies.