Superheater tubes and reheater tubes
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Tube, pipe, fittings and flanges
Superheater tubes and reheater tubes in a comprehensive range of stainless steels and nickel alloys covering outside diameters 12 to 260 mm (0.472 to 10.24 in.).
Our superheater tube and reheater tube materials cover all types of fuel, such as coal, gas, oil, black liquor and biomass. The Alleima portfolio also includes composite tubes consisting of two different alloys fully bonded together.
Increased efficiency in coal-fired power boilers
Our new material Sanicro® 25 is engineered for the next generation of coal-fired power boilers, contributing to significantly greater efficiency and sharply lower CO2 emissions. It is ideal for superheater and reheater tubes, allowing for material temperatures of up to 700ºC (1290ºF). Read more about Sanicro® 25.
Below are the most typical applications for superheater and reheater tubes. Contact us for advice on product selection or other technical support.
| Alleima grade | Typical applications |
|---|---|
| Sanicro® 25 (UNS S31035) |
Superheater and reheater tubes in the next generation of coal-fired power boilers for material temperatures of up to 700ºC (1290ºF). |
| Sanicro® 31HT (UNS N08811/N08810) |
Superheater and reheater tubes in boilers with corrosive conditions. |
| Sanicro® 41 (UNS N08825) |
Superheater and reheater tubes in boilers with corrosive conditions. Sanicro® 41 is generally more resistant to flue gases compared to Sanicro 31HT. |
| Sanicro® 28 (UNS 08028, EN 1.4563) |
Radiant syngas coolers in IGCC gasification. Superheater tubes in boilers with corrosive conditions. The high chromium content of Sanicro® 28 contributes to high gas corrosion resistance. |
| Sanicro® 30 (UNS N08800) |
Radiant syngas coolers in IGCC gasification. |
| Esshete 1250 (EN 1.4982) |
Superheater and reheater tubes in sub-critical and supercritical coal-fired, biomass and other boilers. Esshete 1250 has higher creep strength than most other alloys. |
| Alleima 7RE10 (UNS S31008/S31009) |
Superheater tubes in boilers with corrosive conditions. |
| Alleima 3R69 BT** (EN 1.4910) |
Superheater and reheater tubes in sub-critical and supercritical coal-fired boilers. |
| Alleima 8R61 (EN 1.4918) |
Superheater and reheater tubes in sub-critical coal-fired boilers and other boilers. |
| Alleima 6LR62 (UNS S31600/S31609) |
Superheater and reheater tubes in sub-critical coal-fired boilers and other boilers. |
| Alleima 8R41 (EN 1.4961) |
Superheater and reheater tubes in sub-critical coal-fired boilers and other boilers. |
| Alleima 8R40 (UNS S34709, ASTM 347H) |
Superheater and reheater tubes in sub-critical coal-fired, biomass and other boilers. Sandvik 8R40 can also be supplied in a fine-grain version. |
| Alleima 6R44 (UNS S34709, ASTM 347H) |
Superheater and reheater tubes in sub-critical coal-fired, biomass and other boilers. |
| Alleima 6R35 (UNS S32109, ASTM 321H) |
Superheater and reheater tubes in sub-critical coal-fired boilers and other boilers. |
| Alleima 5R10 (UNS S30409, ASTM 304H) |
Superheater and reheater tubes in sub-critical coal-fired boilers and other boilers. |
*Esshete 1250 is a trademark owned by Corus
Superheater and reheater tube materials (other grades can be offered on request)
| Alleima grade | UNS | ASTM | EN steel no. | EN name |
|---|---|---|---|---|
| Sanicro® 251) | S31035 | - | 1) | - |
| Sanicro® 31HT2) | N08811/N08810 | 800HT | 1.4959 | X8NiCrAlTi32-21 |
| Sanicro® 41 | N08825 | (Alloy 825)5) | 2.4858 | - |
| Sanicro® 283) | N08028 | (Alloy 28)5) | 1.4563 | X1NiCrMoCu31-27-4 |
| Sanicro® 30 | N08800 | (Alloy 800)5) | 1.4558 | X2NiCrAlTi32-20 |
| Esshete 12504) | S21500 | - | 1.4982 | X10CrNiMoMnNbVB15-10-1 |
| Alleima 7RE10 | S31008/S31009 | 310S/310H | 1.4845 | - |
| Alleima 3R69 | S31651 | 316N | 1.4910 | X3CrNiMoBN17-13-3 |
| Alleima 8R61 | (S31600/S31609) | (316H) | 1.4918 | X6CrNiMo17-13-2 |
| Alleima 6LR62 | S31600/S31609 | 316H | 1.4401 | X5CrNiMo17-12-2 215S51 |
| Alleima 8R41 | - | - | 1.4961 | X6CrNiTiB18-10 |
| Alleima 8R40 | S34709 | 347H | 1.4550/1.4912 | X7CrNiNb18-10 |
| Alleima 6R44 | S34709 | 347H | 1.4550/1.4912 | X7CrNiNb18-10 |
| Alleima 6R35 | S32100/S32109 | 321/321H | 1.4541/1.4940 | X7CrNiTi18-10 |
| Alleima 5R10 | S30400/S30409 | 304/304H | 1.4948 | X6CrNi18-10 |
1) Approved by VD TÜV 555
2) Approved by VD TÜV 434
3) Approved by VD TÜV 483
4) Approved by VD TÜV 520. Esshete 1250 is a trademark owned by Corus
5) Common name
| Country | Standard | Specification |
|---|---|---|
| American | ASME SA213 ASTM A213 |
Seamless ferritic and austenitic alloy steel boiler, superheater and heat exchanger tubes. |
| British | BS3059 BS3605 |
Steel boiler and superheater tubes. Seamless and welded austenitic stainless steel pipes and tubes for pressure purposes. |
| European | EN 10216-5 | Seamless steel tubes for pressure purposes. |
| French | NFS 49-214 | Steel tubes and seamless austenitic steel tubes for use at high temperatures. |
| German | DIN 17459 AD Merkblatt W2 |
High temperature seamless circular stainless steel tubes. Materials for pressure vessels – austenitic steels. |
| Japanese | JIS G3463 | Stainless steel boiler and heat exchanger tubes. |
| Russian | TU 14-3-460-75E TU 14-3-796-79 |
Steam boiler tubes and pipe-lines of high or subcritical steam parameter equipment. |
Alleima superheater and reheater tubes can be delivered in the following sizes and lengths.
Outside diameter (OD)
12 to 260 mm (0.472 to 10.24 in.)
Wall thickness (WT)
2-20 mm (0.0787-0.787 in.)
Tolerances
Tolerances according to specification or according to an agreement. Standard tolerances are:
| Hot finished | OD +/- 1% | WT +/-12.5% |
| Cold finished | OD +/-0.75% | WT +/-10% |
Lengths
Alleima superheater and reheater tubes can be delivered in lengths up to 16 meters.