AMS 5631 - 440A Stainless Steel Bars and Forgings
AMS 5631 is the spec created by SAE International for 440A stainless steel bars and forgings. 440A is a high-carbon content stainless steel with a martensitic structure. It is AOD-melted material for refined purity and quality. It has a little less carbon than 440B and 440C stainless steel, which makes it easier to machine while still offering a good balance of properties.
Typical Applications of AMS 5631
AMS 5631 440A Stainless Steel is commonly used in:
- Cutting blades and industrial knives
- Dental and surgical instruments
- Valve components and bushings
- Pump shafts and fasteners
- Food processing equipment
What is 440A Stainless Steel
440A is a high carbon martensitic stainless steel that is AOD melted. This alloy can be heat treated to extremely high hardnesses. It has slightly less carbon than 440B and 440C giving it better machinability but less hardness. The combination of good wear resistance and high hardness makes this alloy an excellent candidate for cutting tools and knife blades. It also is often used for dental and surgical equipment.
440 STAINLESS STEEL SPECIFICATIONS
440A Stainless Steel
440A is a high-carbon martensitic stainless steel, AOD melted for refined quality and consistency. It contains slightly less carbon than 440B and 440C
440C Stainless Steel
440C is the hardest and most wear-resistant grade in the 440 series due to its highest carbon content. It achieves excellent dimensional stability and superior bearing performance after hardening.
Certified Material for Critical Service
Fighter Jet Metals supplies 440A, 440B, 440C, and 440FSE Stainless Steel in various forms—bars, plates, and forgings—with full traceability and certification. Each alloy meets the highest aerospace and industrial standards, offering guaranteed quality and performance.