431 in CNC Machining
431 is a high-chromium, low-nickel martensitic stainless steel known for high hardenability, strength, and good corrosion resistance. It is used in aerospace and marine applications.
- High hardenability: 431 responds well to hardening for demanding components.
- High strength: Its strength suits aerospace and marine parts.
- Corrosion resistant: 431 provides good corrosion resistance for harsh service environments.
Selection note: Stainless steel offers excellent corrosion resistance, strength, and easy cleaning. RapidDirect provides as-machined, electroplated, passivated, powder-coated, polished, and brushed surfaces.
Compare other Stainless Steel grades431 Capabilities
| Price | $$$ |
|---|---|
| Lead time | Under 10 days |
| Wall thickness | 0.75 mm |
| Tolerances | ±0.005 in (±0.125 mm) |
| Maximum part size | 2000 × 800 × 1000 mm |
| Available grades | 431 |
431 Stainless Steel Material Specifications
Mechanical Properties
| Tensile strength, yield | 690–900 MPa |
|---|---|
| Fatigue strength | 350 MPa |
| Elongation at break | 15–17 % |
| Hardness | 248–293 Brinell |
Physical Properties
| Density | 7.75 g/cm³ |
|---|
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431 Stainless Steel Parts & Applications


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Learn about 431 applications, capabilities, and finishing options.