Grade dossier
Custom 465 Stainless Steel for Very High Strength and Damage Tolerance
A premium high-strength precipitation-hardening grade developed for aerospace structures requiring strength, fracture toughness and corrosion resistance.
Identity before substitution
Define the grade, product and condition together
A familiar grade name is not a complete purchase specification. Product form, controlling standard, dimensions, condition, finish, certification and service environment determine whether the delivered material is suitable.
Composition control
ASTM A240/A240M flat-product chemistry
Limits are not heat analysis targets
The table summarizes grade limits commonly used for plate, sheet and strip. Pipe, tube, bar, forgings and cast products can be governed by different specifications. Always place the product standard and edition on the purchase order.
| C | 0.020 max |
|---|---|
| Mn | 0.25 max |
| Si | 0.25 max |
| P | 0.015 max |
| S | 0.010 max |
| Cr | 11.00-12.50 |
| Ni | 10.75-11.25 |
| Mo | 0.75-1.25 |
| Ti | 1.50-1.80 |
Properties with context
Minimums, typical indicators and delivered condition
Specified annealed flat-product values
| Solution-treated condition | Starting state; final properties require aging |
|---|---|
| H950 | Can exceed 1724 MPa / 250 ksi tensile; use certified minimums |
| H1000 | Lower strength with increased toughness |
| Cold-work plus aging | May increase strength; requires separate qualification |
Selection indicators
| Density | about 7.8 g/cm3 |
|---|---|
| Strength | among the highest commercial PH stainless grades |
| Damage tolerance | Designed for strong toughness-strength combinations |
| Procurement rule | Melt practice, condition and inspection are integral |
Values depend on product form, thickness, test orientation, condition and governing edition. Use the mill test certificate and the purchase specification for acceptance, not a web table alone.
Selection boundary
Where Custom 465 belongs and where to escalate
Grade selection is an environmental decision, not a popularity contest. Review the complete medium, temperature, geometry, fabrication, cleaning and inspection requirements.
Good reasons to evaluate it
Aircraft torque tubes, braces and structural fittings
Landing-gear and actuation components
High-strength shafts and pressure hardware
Corrosion-resistant replacement for plated alloy steel after qualification
Reasons to stop and review
Using 250 ksi as a universal minimum
Ordering without AMS/ASTM condition and melt route
Welding or heat treating outside the qualified route
Assuming equivalence to Custom 455 or 13-8 Mo
Fabrication route
Protect properties through cutting, forming and welding
Specify S46500, AMS/ASTM standard and melt route.
Plan machining and joining before final aging.
Control surface contamination and heat-treatment atmosphere.
Verify tensile, hardness, fracture-toughness and NDE requirements.
Supply definition
Product form changes the applicable requirements
Do not send an RFQ that names only the grade. State form, governing standard, dimensions, tolerances, finish, edge or end condition, quantity, certification and inspection.
Bar and forgings to AMS 5936
ASTM A564/A564M and A693 products where applicable
Premium-remelt aerospace stock
Machined structural and medical components
Certificate checkpoint
Request heat identity, chemical analysis, mechanical results and compliance to the exact product specification. Add PMI, corrosion testing or supplementary examination only when the application requires it.
Interactive selection check
Test Custom 465 against the controlling question
Procurement FAQ
Questions to close before placing the order
Is Custom 465 stainless steel magnetic?
Magnetic response depends on microstructure and delivered condition.
Can Custom 465 replace another grade?
Only after checking the governing standard, composition, mechanical properties, corrosion exposure, fabrication route and certification. A commercial name is not a substitution approval.
Does the table apply to every product form?
No. Custom 465 is S46500 and its properties depend on the full solution treatment, aging condition, product form and qualification route.
What should a Custom 465 RFQ include?
Product form, standard and edition, UNS or EN designation, dimensions, tolerances, finish, quantity, service, fabrication, certificate and inspection requirements.
Sources, scope and RFQ
Use traceable grade data, then specify the actual product
Carpenter Technology Custom 465 official datasheet
AMS 5936 requirements for applicable S46500 products
ASTM A564/A693 requirements where applicable
MMPDS/design allowables and purchaser damage-tolerance requirements