AMS-S-18732
AMS-S-18732 (MIL-S-18732) is a canceled military specification for 431 stainless steel. Although this specification has been discontinued, Fighter Jet Metals can produce a material that meets this specification for aerospace, defense, and industrial uses.
Mechanical and Physical Properties
- Tensile Strength: Up to 200 ksi (1379 MPa) in hardened condition
- Hardness: 28–45 HRC depending on heat treatment
- Impact Toughness: Excellent even at elevated hardness levels
- Corrosion Resistance: High for a martensitic stainless steel
- Heat Treatment: Hardened and tempered for maximum performance
What is 431 Stainless Steel ?
431 Stainless Steel is a high-strength martensitic steel with the highest corrosion resistance of all martensitic stainless steel grades. It is intended for extreme structural and marine applications, with high toughness, high tensile strength, and moderate corrosion resistance, making it the top choice for use in aircraft and high-performance industrial products.
431 STAINLESS STEEL SPECIFICATIONS
Bars & Forgins
High-quality bars and forgings suitable for structural, machined, and high-stress components.
Certified Material for Critical Service
Fighter Jet Metals provides 431 Stainless Steel that meets AMS, MIL, and DMS requirements with full mill certifications, heat lot traceability, and mechanical testing. Material is supplied in bar, plate, and forging forms for aerospace, marine, and defense-grade manufacturing.