Superheater tubes for boilers

Superheater tubes and reheater tubes

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.

Product standards
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

Product standards
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.

Hot finished	OD +/- 1%	WT +/-12.5%
Cold finished	OD +/-0.75%	WT +/-10%

Superheater tubes and reheater tubes

Increased efficiency in coal-fired power boilers

Superheater and reheater tube materials (other grades can be offered on request)

Outside diameter (OD)

Wall thickness (WT)

Tolerances

Lengths

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