9310 ALLOY STEEL – AMS 6265 VAR - UNS 93106
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.
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:
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- Aircraft engine gears & pinions
- Shafts
- Clutch Parts
- Boring bars
- Piston pins
- Aluminum rolling mill rolls
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Common Trade Names:
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- Lescalloy 9310 Vac-Arc
- European Designation 10NiCrMo13-5
- 9310 VAR
- AISI 9310
- SAE 9310
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Common OEM Approvals:
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- Bell Helicopter
- Boeing
- Bombardier
- GE
- Honeywell
- Pratt Whitney LCS
- Sikorsky
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Common Specifications:
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- 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
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Physical Properties:
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- Density: 0.2836 #/in3
- Grain Size 5 or finer (as supplied Norm & Temp)
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9310 VAR AMS 6265 Stocked Sizes:
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- 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
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Chemical Composition:
| Symbol | Element | Min % | Max % |
C | Carbon | 0.07% | 0.13% |
Mn | Manganese | 0.40% | 0.70% |
Si | Silicon | 0.15% | 0.35% |
P | Phosphorus | | 0.015% |
S | Sulfur | | 0.015% |
Cr | Chromium | 1.00% | 1.40% |
Ni | Nickel | 3.00% | 3.50% |
Mo | Molybdenum | 0.08% | 0.15% |
B | Boron | | 0.001% (10 ppm) |
Cu | Copper | | 0.035% |
Hardenability Requirements:
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- Jominy: J 1/16 inch: 41 RC Hardness max
- Jominy: J 6/16 inch: 32 RC Hardness max
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For Material Normalized 1700° F (927° C) with Test Specimen Annealed 1500° F (816° C)
Heat Treatment:
| Type | Process |
| Annealing | Heat throughout to 1475° - 1575° F, then furnace cool |
| Normalizing | Heat throughout to 1650° - 1750° F, then air cool |
| Carburizing & Hardening | Carburize at 1650° - 1700° F, slow cool. To harden, oil quench from 1425-1545 F |
| Temper | At 250° - 350° F |
| Approx Case Hardness | 60 – 62 HRC |
| Approx Core Hardness | 331 – 363 BHN |
9310 VAR & 9310 VIM VAR: AS9100 Mill Producers
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- Dunkirk Specialty Steel, a Universal Stainless company
- Carpenter Technology Corp. Latrobe Specialty Metals
- Liberty Speciality Steels Ltd
- Universal Stainless & Alloy Products
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Typical Core Properties after Pseudo-Carburizing:
| Heat Treatment | Tensile Strength |
Yield Strength | Elongation in 2" |
Reduction of Area | Core Hardness |
Pseudo Carburized 1700° F for 8 hours. Oil quenched, Tempered at 300° F for 2 hours
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187 ksi | 155 ksi | 15% | 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
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155 ksi | 130 ksi | 15.5% | 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 ksi | 155 ksi | 16% | 53% | 363 Bhn |
Pseudo Carburized: Heat Treat with same process as for Carburizing, but without the presence of Carburizing Gas Furnace Atmosphere.
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