How Custom 465 Enhances Performance in Critical Aerospace Components
Quick answer: Custom 465 (UNS S46500, AMS 5936) is a titanium-strengthened, precipitation-hardening stainless steel. After a single aging treatment it reaches about 1,765 MPa (256 ksi) tensile strength in H950 while keeping good toughness and stress-corrosion cracking resistance. That is why it is used for landing-gear components, actuators, flap and slat tracks, structural fittings and high-strength fasteners – parts that need steel-like strength without corrosion-protective plating.
Need material? See Custom 465 bars – UNS S46500 / AMS 5936.
What Makes Custom 465 Suitable for Aerospace?
| Property | Custom 465 | Why it matters in aircraft |
|---|---|---|
| Strength | ≈ 1,765 MPa (H950) / ≈ 1,595 MPa (H1000) tensile | Smaller, lighter parts for the same load |
| Toughness | Notch tensile ratio ≈ 1.4–1.5; good fracture toughness | Resists crack growth in fatigue-loaded parts |
| Stress-corrosion cracking | Much better than low-alloy steels at similar strength | Landing gear and actuators see moisture, de-icing fluids and salt |
| Corrosion resistance | Stainless – about 11.5% Cr | Can avoid cadmium or other protective plating |
| Heat treatment | Machine in Condition A, then age once at 510–538 °C | Low distortion, no quench after machining |
| Design data | AMS 5936, MMPDS allowables | Accepted for certified aircraft structures |
How Custom 465 Gets Its Strength
Custom 465 contains about 11.5% chromium, 11% nickel, 1% molybdenum and 1.5–1.8% titanium. It is supplied solution treated (Condition A), refrigerated to complete the martensite transformation, and then aged. During aging, very fine nickel-titanium precipitates form in the martensite and raise the strength sharply. No quenching and tempering, cold working or micro-alloying is involved – the strength comes from this single precipitation-hardening step.
| Condition | Aging | Tensile strength (typical) | Hardness | Typical choice for |
|---|---|---|---|---|
| H950 | 510 °C (950 °F), 4 h | ≈ 1,765 MPa (256 ksi) | ≈ 49.5 HRC | Maximum strength – fasteners, pins, shafts |
| H1000 | 538 °C (1,000 °F), 4 h | ≈ 1,595 MPa (231 ksi) | ≈ 47.5 HRC | Strength + toughness + SCC resistance – landing gear, fittings |
Full chemistry, heat-treatment steps and sizes are on our Custom 465 bars page.
Where Custom 465 Is Used in Aircraft
- Landing-gear components: pins, links, axles and bushings that need high strength and corrosion resistance without plating.
- Actuators and flight-control parts: rods, pistons and screws in flap, slat and spoiler actuation systems.
- Flap and slat tracks: long, highly loaded parts exposed to the outside environment.
- Structural fittings and fasteners: high-strength bolts and fittings where 17-4PH or 15-5PH are not strong enough.
- Helicopter and drive-train parts: shafts and couplings that combine fatigue strength with corrosion resistance.
Where Custom 465 Is Not Used
Custom 465 is not a high-temperature alloy. Engine hot sections, turbine discs and exhaust parts need nickel superalloys such as Inconel 718 or A286. For the very highest strength with outstanding corrosion resistance at low temperature, designers also consider MP35N.
Custom 465 vs Other Aerospace Steels
| Material | Typical peak tensile strength | Stainless? | Notes |
|---|---|---|---|
| Custom 465 (H950) | ≈ 1,765 MPa | Yes | High strength + SCC resistance, no plating needed |
| PH 13-8Mo (H950) | ≈ 1,550 MPa | Yes | Very good transverse toughness |
| 17-4PH (H900) | ≈ 1,380 MPa | Yes | Lower cost, less critical parts |
| 35NCD16 / 4340 / 300M | ≈ 1,800 – 1,950 MPa | No | Highest strength, but needs plating or coating against corrosion |
Frequently Asked Questions
Why is Custom 465 used in aerospace?
Custom 465 combines very high strength (about 1,765 MPa tensile in H950) with good fracture toughness and stress-corrosion cracking resistance in a stainless steel. That lets designers make smaller, lighter landing-gear, actuator and fastener parts that do not need corrosion-protective plating.
Which aerospace specification covers Custom 465?
Custom 465 bar for aerospace is supplied to AMS 5936 (UNS S46500). Heat treatment is normally carried out to AMS 2759/3, and design allowables are published in MMPDS.
Should I use H950 or H1000 for aerospace parts?
H950 gives maximum strength (about 1,765 MPa, 49.5 HRC). H1000 gives slightly lower strength (about 1,595 MPa, 47.5 HRC) but better toughness and stress-corrosion cracking resistance, so it is often chosen for landing-gear and structural parts exposed to the environment.
Can Custom 465 be used in jet-engine hot sections?
No. Like other precipitation-hardening stainless steels, Custom 465 is used at low and moderate temperatures. Engine hot sections use nickel superalloys such as Inconel 718.
Is Custom 465 better than 17-4PH for aerospace?
For highly loaded parts, yes. Custom 465 in H950 is about 30% stronger than 17-4PH in H900 and has better toughness and SCC resistance at that strength. 17-4PH remains a lower-cost choice for less critical parts.
Buy Custom 465 Bars from ASC LLP
ASC LLP, Mumbai, supplies Custom 465 round bar, bar stock and forged bar to AMS 5936 and ASTM A564, in the solution-treated condition ready for machining and aging, with EN 10204 3.1 certificates. Send your requirement to sales@amardeepsteel.com or call 022-67439130.
Related reading: 35NCD16 for landing gear · MP35N aircraft fasteners · A286 for aerospace fasteners
Custom 465® is a registered trademark of CRS Holdings, Inc., a subsidiary of Carpenter Technology Corporation.
