Aermet 100
Request a quote for Aermet 100Aermet 100 is a cobalt and nickel bearing martensitic steel developed to break the usual trade between strength and fracture toughness. At roughly 280 ksi tensile it retains fracture toughness well above conventional ultra high strength steels, together with markedly better resistance to stress corrosion cracking.
It is double vacuum melted, VIM followed by VAR, and hardens by a simple age after solution treatment and cryogenic treatment, without the distortion penalties of a high temperature quench and temper cycle on complex geometry.
We stock Aermet 100 in bar and billet for landing gear, actuators, shafting and fracture critical airframe hardware, with full melt traceability.
Sizes and stock
- Round bar: through 10" DIA
- Custom shapes and forgings: per request
Processing capabilities
- Vacuum melted (VAR / VIM-VAR) stock with full melt traceability
- Normalize, anneal, quench and temper to the ordered condition
- Saw cutting, trepanning, gun drilling and rough machining
- Magnetic particle and ultrasonic inspection to AMS 2301 / AMS 2154 on request
Specifications
Material is released to the applicable specification with mill test reports and, on request, independent lab verification.
Why engineers specify Aermet 100
- High fracture toughness at ultra high strength
- Better stress corrosion cracking resistance than 4340 or 300M
- Double vacuum melted for cleanliness
- Simple age hardening cycle with low distortion
Nominal chemistry
Percent by weight, nominal composition per the governing specification. The mill test report for your heat is the controlling document.
Typical mechanical properties
| Condition | Tensile strength | Yield strength | Elongation | Hardness |
|---|---|---|---|---|
| Annealed | ~150 ksi | ~90 ksi | ~15% | - |
| Solution treated, cryo, aged 900F | 280 ksi min | 235 ksi min | 10% min | 53-55 HRC |
Typical published values for reference only, not for design. Properties vary with section size, product form and processing. Order to the specification and condition your drawing requires.
Heat treatment and conditions
- 01Solution treat around 1650F
- 02Cryogenic treat at -100F
- 03Age around 900F for 5 hours, air cool
If our stock is not already in the condition you need, we can quote the material with the heat treatment performed before it ships.
Typical applications
- Landing gear and actuator components
- Fracture critical airframe structure
- Drive shafts and couplings
- Armor and ordnance hardware
Fabrication notes
Machining
Best machined in the annealed or normalized-and-tempered condition, then heat treated to final strength. Rough machining before hardening, with a finish pass after temper, controls distortion on long or thin sections. We can supply rough turned, trepanned or gun drilled stock so your first operation starts closer to net shape.
Welding
Weldable with low hydrogen practice, preheat appropriate to carbon equivalent and section size, and a post weld stress relief or full re-heat treat. For high strength conditions the weld and heat affected zone should be re-treated to restore properties.
Forming
Hot work in the annealed condition. Cold forming is limited at high hardness, so bend and form before hardening and follow with stress relief where the geometry is tight.
Aermet 100 compared with similar grades
300M
Similar strength, lower toughness and lower stress corrosion resistance, lower cost.
Maraging 250/300
Comparable strength class, different alloy system, generally lower toughness than Aermet 100.
Designations and cross reference
- Material family
- Alloy Steels
Working from an obsolete, foreign or superseded designation? Send it over and we will cross reference it to a current grade and specification.
Quality, testing and traceability
Supplied aircraft quality with mill test reports, melt and heat traceability, and, on request, magnetic particle inspection to AMS 2301 or AMS 2300, ultrasonic inspection to AMS 2154, chemical assay, hardness and full mechanical testing.
We are AS9100D and ISO 9001:2015 registered. If our stock does not already carry the inspection your specification requires, we can quote the material with that work performed. More on our quality system
Available forms
Custom sizes converted from billet, plus saw cut, waterjet and near-net blanks. See custom conversions
Aermet 100 frequently asked questions
What is Aermet 100?
Aermet 100 is a cobalt and nickel bearing martensitic steel developed to break the usual trade between strength and fracture toughness. At roughly 280 ksi tensile it retains fracture toughness well above conventional ultra high strength steels, together with markedly better resistance to stress corrosion cracking.
What forms is Aermet 100 available in?
We supply Aermet 100 in bar, forging. Custom sizes are converted from billet, and we can provide saw cut, waterjet or near net blanks so material arrives closer to your finished part.
What specifications can Aermet 100 be supplied to?
Commonly ordered specifications include AMS 6478, AMS 6532. Material is released to the specification and condition on your purchase order, with mill test reports supplied as standard.
What conditions can Aermet 100 be ordered in?
We can supply Annealed, Solution treated, cryo, aged 900F. If our stock is not already in the condition you need, we can quote it with the heat treatment performed before shipment.
Can you cut Aermet 100 to size?
Yes. Saw cutting, waterjet, laser and shearing are available, along with trepanning, gun drilling, lathe turning and CNC machining, so you can order blanks or rough machined pieces rather than full lengths.
Do you provide test reports and additional testing on Aermet 100?
Every order ships with mill test reports and heat traceability. If your print calls for ultrasonic inspection, penetrant dye, magnetic particle, chemical assay, micrography, hardness or mechanical testing and our stock does not already carry it, we can quote the material with that work performed.
Can Aermet 100 be supplied to DFARS domestic melt requirements?
Tell us at quote stage if the order is DFARS or domestic melt restricted and we will confirm availability against that requirement before you commit.
What do you need to quote Aermet 100?
Grade, form, dimensions, quantity, specification and condition, plus any testing or certification requirements and the date you need it. Send a drawing if you have one. Quotes are typically ready within 24 hours.
How does Aermet 100 compare with 300M?
Similar strength, lower toughness and lower stress corrosion resistance, lower cost.