1.4057 (Type 431) is a hardenable martensitic stainless steel alloy which combines high tensile strength and torsional strength. The material is well suited to shaft manufacture due to these characteristics.
Of all the stainless steels, 1.4057 it has one of the best combinations of high strength, corrosion resistance, and good impact toughness.
| Product Form | Condition | Imperial Sizes | Metric Sizes |
|---|---|---|---|
| Round Bar | QT800 | 1⁄8" - 6" | 4.0mm - 30.0mm |
| Round Bar | Condition P | 1⁄8" - 6" | 4.0mm - 30.0mm |
| Chemical Element | % Present |
|---|---|
Carbon (C) | 0.00 - 0.20 |
Manganese (Mn) | 0.00 - 1.00 |
Silicon (Si) | 0.00 - 1.00 |
Phosphorous (P) | 0.00 - 0.04 |
Sulphur (S) | 0.00 - 0.03 |
Chromium (Cr) | 15.00 - 17.00 |
Nickel (Ni) | 1.25 - 2.50 |
| Mechanical Property | Value |
|---|---|
Elongation A50 mm | 11 % |
Tensile Strength | 850-1000 MPa |
Proof Stress | 665 MPa |
Hardness Brinell | 248-302 HB |
| Physical Property | Value |
|---|---|
Density | 7.8 g/cm³ |
Modulus of Elasticity | 200 GPa |
Thermal Conductivity | 20.2 W/m.K |
Heat treatment temperatures, including rate of heating, cooling and soaking times will vary due to factors such as the shape and size of each component. Other considerations during the heat treatment process include the type of furnace, quenching medium and work piece transfer facilities. Please consult your heat treatment provider for full guidance on heat treatment of 431 stainless.
Easily machined in the annealed state.
Risk of cracking. Pre-heating recommended.
431 stainless steel offers the best corrosion resistance of all martensitic stainless steel grades. Optimum corrosion resistance is achieved when used in the hardened and tempered condition. Allowing oxygen to circulate freely on the surface will form an oxide film which protects the surface. Keeping the surface free of scale and foreign particles improves the corrosion resistance and finished components should be passivated. For best machining and corrosion 431 stainless steel is commonly supplied in the ‘T’ condition.
