9310 ALLOY STEEL – AMS 6265 VAR - UNS 93106 – PREMIUM AIRCRAFT QUALITY

9310 VAR AMS 6265 is a Chromium-Nickel-Molybdenum Alloy used as a Carburizing Grade for Aircraft Parts. Users can obtain high case hardness coupled with high core strength and toughness. High alloy content makes it suitable for use in relatively large cross-sections. Its combination of high alloy and low carbon content can achieve high core hardness with a narrow range between thicker and thinner part cross sections.

9310 Steel Round Bar
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This alloy can be used in some applications without case-hardening, as it exhibits strength with excellent toughness and ductility. Carburizing offers a highly wear-resistant surface. Service Steel Aerospace stocks Premium Aircraft Quality produced double melted in an Electric Furnace, followed by a VAR, or Vacuum Arc Remelt (also known as CEVM). Standard air-melted Aircraft Quality AMS 6260 Air Melt material is available on request. 9310 VIM-VAR material is also available on request.

9310 VAR steel is typically used in the following applications:


  • Aircraft engine gears & pinions
  • Shafts
  • Clutch Parts
  • Boring bars
  • Piston pins
  • Aluminum rolling mill rolls
  • Common Specifications:


  • AMS 6265 VAR (CEVM)
  • AMS 6267 Type 2
  • AMS 2300 Cleanliness
  • AMS 6260 Air Melt Aircraft Quality (except VAR)
  • BPS 299-947-032
  • MIL-S-7393 Comp 3 (except VAR)
  • EMS 56729
  • EMS 56280
  • Common Trade Names:


  • Lescalloy 9310 Vac-Arc
  • European Designation 10NiCrMo13-5
  • Common OEM Approvals:


  • Bell Helicopter
  • Boeing
  • Bombardier
  • GE
  • Honeywell
  • Pratt Whitney LCS
  • Sikorsky
  • 9310 VAR AMS 6265 Stocked Sizes:


  • Rounds: 46 sizes 0.750” through 9.50” diameter
  • Flats & Blocks: 12" x 23" block to cut-to-size
    • - Custom thicknesses & widths available saw-cut

    Note: Stocked as Normalized & Tempered

    Chemical Composition:


    SymbolElementMin %Max %
    CCarbon0.07%0.13%
    MnManganese0.40%0.70%
    SiSilicon0.15%0.35%
    PPhosphorus0.015%
    SSulfur0.015%
    CrChromium1.00%1.40%
    NiNickel3.00%3.50%
    MoMolybdenum0.08%0.15%
    BBoron0.001% (10 ppm)
    CuCopper0.035%

    Physical Properties:


  • Density: 0.2836 #/in3
  • Grain Size 5 or finer (as supplied Norm & Temp)
  • Hardenability Requirements:


  • Jominy: J 1/16 inch: 41 RC Hardness max
  • Jominy: J 6/16 inch: 32 RC Hardness max

  • For Material Normalized 1700° F (927° C) with Test Specimen Annealed 1500° F (816° C)

    Heat Treatment:


    TypeProcess
    AnnealingHeat throughout to 1475° - 1575° F, then furnace cool
    NormalizingHeat throughout to 1650° - 1750° F, then air cool
    Carburizing & HardeningCarburize at 1650° - 1700° F, slow cool. To harden, oil quench from 1425-1545 F
    TemperAt 250° - 350° F
    Approx Case Hardness60 – 62 HRC
    Approx Core Hardness331 – 363 BHN


    Typical Core Properties after Pseudo-Carburizing: *


    Heat TreatmentTensile Strength Yield StrengthElongation in 2" Reduction of AreaCore Hardness
    Pseudo Carburized 1700° F for 8 hours. Oil quenched, Tempered at 300° F for 2 hours
    187 ksi155 ksi15%51%375 Bhn
    Pseudo Carburized 1700° F for 8 hours. Slow cool to room temperature. Heat to 1425° F, oil quench. Tempered at 300° F for 2 hours
    155 ksi130 ksi15.5%52%331 Bhn
    Pseudo Carburized 1700° F for 8 hours. Slow cool to room temperature. Heat to 1525° F, oil quench. Tempered at 300° F for 2 hours
    175 ksi155 ksi16%53%363 Bhn

    * Pseudo Carburized: Heat Treat with same process as for Carburizing, but without the presence of Carburizing Gas Furnace Atmosphere.