Alleima® 8RE18 is an austenitic chromium-nickel steel for high-temperature applications.
Standards
- ASTM: TP309S, TP309H
- UNS: S30908/S30909
- EN Number: 1.4833
Chemical composition (nominal)
| C | Si | Mn | P | S | Cr | Ni |
|---|---|---|---|---|---|---|
| 0.07 | 0.5 | 1.7 | ≤0.035 | ≤0.015 | 22.5 | 14 |
Mechanical properties
At 20oC (68oF)
| Proof strength | Tensile strength | Elong. | ||
|---|---|---|---|---|
| Rp0.21) | Rm | A2) | ||
| MPa | ksi | MPa | ksi | % |
| ≥205 | ≥30 | >515 | >75 | ≥35 |
1 MPa = N/mm2
1) Rp0.2 0 corresponds to 0.2% offset yield strength.
2) Based on L0 = 5.65 √S0 where L0 is the original gauge length and S0 the original cross-section area.
Welding
The weldability of Alleima® 8RE18 is good. Welding must be carried out without preheating and subsequent heat treatment is normally not required. Suitable methods of fusion welding are manual metal-arc welding (MMA/SMAW) and gas-shielded arc welding, with the TIG/GTAW method as first choice.
For Alleima® 8RE18, heat input of <2.0 kJ/mm and interpass temperature of <150°C (300°F) are recommended.
Recommended filler metals
TIG/GTAW or MIG/GMAW welding
ISO 14343 S 22 12 H / AWS A5.9 ER309Si (e.g. Exaton 24.13.Si)
MMA/SMAW welding
ISO 3581 E 22 12 R / AWS A5.4 E309-17
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.