Alleima® 253 MA* is an austenitic chromium-nickel steel alloyed with nitrogen and rare earth metals. The grade is characterized by:
- High creep strength
- Very good resistance to isothermal and, above all, cyclic oxidation
- Very good resistance to combustion gases
- Good structural stability at high temperatures
- Good weldability
- The grade can be used at temperatures up to about 1150°C (2100°F)
Trademark information: Alleima® 253 MA is a trademark owned by Outokumpu OY.
Standards
- ASTM: F45
- UNS: S30815
- EN Number: 1.4835
Product standards
Suitable for the production of flanges etc. according to ASTM A182 grade F45.
Certificates
Status according to EN 10 204 3.1
Chemical composition (nominal)
| C | Si | Mn | P | S | Cr | Ni |
|---|---|---|---|---|---|---|
| 0.08 | 1.6 | 0.6 | ≤0.040 | ≤0.030 | 21 | 11 |
Others: N=0.17 Ce=0.05*
* To cerium should be added the quantity of other rare earth metals, since the the additive takes the form of misch metal containing about 50% Ce.
Forms of supply
Sizes and tolerances
Round-cornered square, as well as round billets, are produced in a wide range of sizes according to the following tables. Larger sizes offered on request.
Surface conditions
Square billets
Unground, spot ground or fully ground condition.
Round billets
Peel turned or black condition.
| Size | Tolerance | Length |
|---|---|---|
| mm | mm | m |
| 80 | +/-2 | 4 - 6.3 |
| 100, 114, 126, 140, 150 | +/-3 | 4 - 6.3 |
| 160, 180, 195, 200 | +/-4 | 4 - 6.3 |
| >200 - 350 | +/-5 | 3 - 5.3 |
Sizes and tolerances apply to the rolled/forged condition.
| Size | Tolerance | Length |
|---|---|---|
| mm | mm | m |
| 75 - 200 (5 mm interval) | +/-1 | max 10 |
| >200 - 450 | +/-3 | 3 - 8 |
| Size | Tolerance | Length |
|---|---|---|
| mm | mm | m |
| 77 - 112 (5 mm interval) | +/-2 | max 10 |
| 124, 134 | +/-2 | max 10 |
| 127, 147, 157 | +/-2 | max 10 |
| 142, 152, 163 | +/-2 | max 10 |
| 168, 178, 188 | +/-2 | max 10 |
| 183, 193 | +/-2 | max 10 |
Other products
- Seamless tube and pipe
* 253 MA is a trademark owned by Outokumpu OY.
- Hollow bars
Disclaimer: Recommendations are for guidance only, and the suitability of a material for a specific application can be confirmed only when we know the actual service conditions. Continuous development may necessitate changes in technical data without notice. This datasheet is only valid for Alleima materials.