JFE20-5USR
High oxidation resistant stainless steel
<Composition> 20Cr - 5.5Al - ultra-low C
comparison of corrosion resistance
Heat resistance
Oxidation resistance
- A ferritic stainless steel with outstanding resistance to oxidation at high temperatures.
- Available in super-thin 20 ㎛ foil.
Applications
Metallic honeycomb for automotive exhaust gas purification, combustion cylinders, electric heating devices
Chemical composition
(mass %)
| Steel grade | C | Si | Mn | AI | Cr | La | |
|---|---|---|---|---|---|---|---|
| JFE20-5USR | Std. | ≦0.015 | ≦1.0 | ≦1.0 | 5.0〜6.0 | 19〜21 | 0.06〜0.12 |
| Typical values | 0.005 | 0.1 | 0.1 | 5.5 | 20.0 | 0.08 | |
| JFE18-3USR | Std. | ≦0.010 | ≦1.0 | ≦1.0 | 3.0〜4.0 | 17〜19 | 0.06〜0.12 |
| Typical values | 0.003 | 0.1 | 0.1 | 3.4 | 18.0 | 0.08 | |
Mechanical properties
| Steel grade | Finish* | Thickness (mm) | Yield strength(N/mm²) | Tensile strength(N/mm²) | Elongation(%) | Hv |
|---|---|---|---|---|---|---|
| JFE20-5USR | 2BTH | 0.3 | 1,052 | 1,147 | <2 | 359 |
| 0.05 | 1,147 | 1,222 | <2 | 357 | ||
| 2BT | 0.3 | 525 | 652 | 23 | 216 | |
| 0.05 | 527 | 648 | 25 | 221 | ||
| JFE18-3USR | 2BTH | 0.3 | 975 | 1,019 | <2 | 328 |
| 0.05 | 1,020 | 1,084 | <2 | 331 | ||
| 2BT | 0.3 | 448 | 539 | 30 | 176 | |
| 0.05 | 438 | 539 | 29 | 178 |
*2BTH: No annealing after cold rolling (hard product)
*2BT: Annealed after cold rolling
*2BT: Annealed after cold rolling
Physical properties
| Steel grade | Temp.(℃) | Electrical Resistance (μΩ・cm) |
Specific heat (10³J/kg・℃) |
Thermal diffusivity (cm²/sec) |
Thermal conductivity (W/m・℃) |
Temp.(℃) | Thermal expansion coefficient (10-6/℃) |
Tensile strength※ (N/mm²) |
|---|---|---|---|---|---|---|---|---|
| JFE20-5USR | 20 | 142 | 0.48 | 0.034 | 11.8 | - | - | 650 |
| 100 | 142 | 0.52 | 0.035 | 13.1 | 20 - 100 | 11.1 | - | |
| 300 | 143 | 0.61 | 0.036 | 15.7 | 20 - 300 | 12.0 | - | |
| 600 | 145 | 0.73 | 0.038 | 19.9 | 20 - 600 | 13.3 | 200 | |
| 900 | 148 | 0.69 | 0.046 | 22.5 | 20 - 900 | 14.9 | 35 | |
| 1200 | 148 | 0.70 | 0.053 | 26.5 | 20 - 1,200 | 16.0 | - | |
| JFE18-3USR | 20 | 115 | 0.48 | 0.041 | 14.4 | - | - | 540 |
| 100 | 117 | 0.51 | 0.041 | 15.7 | 20 - 100 | 10.3 | - | |
| 300 | 122 | 0.60 | 0.041 | 18.3 | 20 - 300 | 11.3 | - | |
| 600 | 132 | 0.89 | 0.043 | 22.7 | 20〜600 | 12.5 | 170 | |
| 900 | 138 | 0.69 | 0.049 | 25.1 | 20 - 900 | 13.9 | 30 | |
| 1200 | 140 | 0.71 | 0.056 | 29.6 | 20 - 1,200 | 15.1 | - |
*Thickness: 1.0mm
Oxidation resistance
