431 stainless steel is a heat-treatable martensitic stainless steel known for its high strength, good toughness, and moderate corrosion resistance. Its unique performance characteristics make it an ideal choice for demanding sectors like aerospace, defense, marine, and high-precision machining.
Chemical Composition (Typical Range, wt%)
| Element | C | Cr | Ni | Mn | Si | P | S |
|---|---|---|---|---|---|---|---|
| Content | ≤0.20 | 15.0–17.0 | 1.25–2.50 | ≤1.0 | ≤1.0 | ≤0.040 | ≤0.030 |
Mechanical Properties (After Heat Treatment)
| Property | Typical Value |
|---|---|
| Hardness | Up to 285 HB (annealed), ≥ 40 HRC (hardened) |
| Tensile Strength | 850–1000 MPa |
| Yield Strength | ≥ 635 MPa |
| Elongation | ≥ 15% |
Key Advantages
| Advantage | Description |
|---|---|
| Heat Treatable | Can be hardened through quenching and tempering |
| High Mechanical Strength | Suitable for high-load components |
| Moderate Corrosion Resistance | Ideal for marine and humid environments |
| Excellent Machinability | Allows precision machining in annealed condition |
Typical Applications
| Industry | Components |
|---|---|
| Aerospace | Fasteners, shafts, landing gear parts |
| Precision Machinery | Couplings, bushings, structural pins |
| Marine Equipment | Valve stems, pump shafts |
| Defense Systems | Rotors, housings, firearm components |
Thanks to its excellent combination of strength, corrosion resistance, and machinability, 431 stainless steel bar is widely used in high-performance sectors. For buyers seeking stable quality and flexible processing options, Tongyi Metal is a trusted manufacturer offering 431 stainless steel bars with customizable services and global delivery support.
