What is Super Duplex 2507?

Super Duplex 2507 (UNS S32750, Werkstoff 1.4410, X2CrNiMoN25-7-4) is a nitrogen-enhanced super duplex stainless steel with a balanced 50 to 50 austenite-ferrite microstructure. Nominal composition is 25Cr-7Ni-3.5Mo-0.3N with no intentional copper and no intentional tungsten. PREN above 41 qualifies the alloy as super duplex per NORSOK M-630. The alloy is solution annealed at 1040 to 1100 degrees Celsius and water quenched, with no precipitation hardening or aging step.

What is Super Duplex 2507 equivalent to?

Super Duplex 2507 is registered as UNS S32750 in the Unified Numbering System and as Werkstoff 1.4410 / X2CrNiMoN25-7-4 in EN 10088-3. Mill trademarks for the same UNS S32750 chemistry include SAF 2507 (Sandvik), UR 52N+ (Industeel ArcelorMittal) and Avesta 2507 (Outokumpu). It is covered by ASTM A479 (bar), A789 (tube), A790 (pipe), A815 (fittings, designation WP-S32750), A276 (shapes), and A182 grade F53 (forgings, flanges, forged fittings).

Is Super Duplex 2507 the same as Zeron 100?

No. Both are super duplex stainless steels with PREN above 40, but they are different alloys. Zeron 100 (UNS S32760) contains nominal 0.7 percent each of copper and tungsten. Super Duplex 2507 (UNS S32750) contains neither. The forging spec for 2507 is ASTM A182 F53; for Zeron 100 it is ASTM A182 F55. The two are not drop-in substitutes when a project specification names one or the other by UNS number.

What is the PREN of Super Duplex 2507?

Super Duplex 2507 has a PREN of approximately 41 to 43, calculated using the formula Cr + 3.3 times Mo + 16 times N. A typical mill heat with 25 percent chromium, 3.8 percent molybdenum, and 0.28 percent nitrogen yields PREN about 42. NORSOK M-630 requires PREN of 40 or above for super duplex classification.

What is the heat treatment of Super Duplex 2507?

Solution annealing at 1040 to 1100 degrees Celsius followed by rapid water quench. There is no precipitation hardening, no aging, no temper. The water quench must drive the material rapidly through the 600 to 1000 degrees Celsius band to avoid sigma-phase formation, which would cut Charpy toughness by 80 percent or more and compromise pitting resistance.

Is Super Duplex 2507 acceptable for sour service?

Yes, Super Duplex 2507 is qualified for sour service per NACE MR0175 and ISO 15156-3 with hardness restricted to 28 HRC maximum and ferrite content within 35 to 65 percent. Specific H2S partial pressure and chloride limits depend on the application zone classification. TorqBolt supplies 2507 fasteners and forgings with NACE compliance certification on request.

Why does Super Duplex 2507 have no copper or tungsten?

The defining chemistry of UNS S32750 is 25Cr-7Ni-3.5Mo-0.3N with no intentional copper or tungsten addition. Adding either changes the alloy. Zeron 100 (S32760) adds about 0.7 percent each. Ferralium 255 (S32550) adds copper. Mixing these chemistries on a 2507 page is incorrect and creates a chimeric specification that does not exist in any mill datasheet or ASTM standard.

Which welding filler is correct for Super Duplex 2507?

ER2594 (overmatching, slightly higher PREN than the base) is the most common choice per AWS A5.9. ER2553 (matching) is also acceptable for less aggressive service. Both are nitrogen-enhanced fillers. Heat input should remain between about 0.5 and 2.5 kJ per millimetre, with interpass temperature below 150 degrees Celsius to avoid sigma-phase precipitation in the heat-affected zone.

What is Super Duplex 2507 used for?

Super Duplex 2507 is used in seawater service (velocities up to 6 metres per second), oil and gas downhole and surface (NACE MR0175 sour service), desalination plants (MSF, MED, RO), marine and subsea hardware (manifolds, christmas trees, jumpers), chemical processing (dilute HCl, H2SO4, HF), pulp and paper bleach plants (chlorine dioxide service), and flue gas desulfurization (WFGD absorber, quencher, outlet duct). Service temperature range is approximately minus 50 to 250 degrees Celsius continuous; sigma-phase risk above 300 degrees Celsius limits long-term high-temperature service.

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Super Duplex Stainless Steel

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Avesta 2507, Outokumpu Super Duplex Stainless Steel

Name: Super Duplex 2507 (UNS S32750 / EN 1.4410)
Brand: TorqBolt
SKU: TB-2507
Availability: InStock

Avesta 2507 is the Outokumpu trademark for the super duplex stainless steel chemistry registered as UNS S32750 in the American Unified Numbering System and Werkstoff 1.4410 (X2CrNiMoN25-7-4) in EN 10088-3. The "Avesta" prefix references the Avesta Sheffield works (formerly Avesta AB, merged into Outokumpu in 2001), which holds long-standing pedigree in duplex stainless steel production.

Avesta 2507 carries the same chemistry, mechanical properties and corrosion resistance as UNS S32750 from any other producer. It is dual-certified to ASTM A479 / A790 / A240 and EN 10088-3. Outokumpu is a Finnish stainless steel producer with primary super duplex production from the Avesta mill in Sweden and the Tornio mill in Finland. Avesta 2507 is widely cited in pulp and paper, desalination, oil and gas and chemical processing project specifications worldwide.

Outokumpu Trademark and Provenance

Avesta 2507 is supplied by Outokumpu Oyj (Finland), the parent company that absorbed Avesta Sheffield in 2001. The Avesta mill in central Sweden has produced duplex and super duplex stainless steel since the 1970s, originally under Avesta AB and continuously operated since the Outokumpu acquisition. The mill is one of the largest integrated stainless steel works in Europe, with melting, hot rolling, cold rolling and finishing capability for plate, sheet, strip and coil.

Avesta 2507 Composition (Outokumpu Datasheet)

Element	Outokumpu Typical %	UNS S32750 Window %
Carbon (C)	0.020 max	0.030 max
Chromium (Cr)	25.0	24.0 to 26.0
Nickel (Ni)	7.0	6.0 to 8.0
Molybdenum (Mo)	4.0	3.0 to 5.0
Nitrogen (N)	0.27	0.24 to 0.32
Copper (Cu)	0.50 max (residual, not intentional)	0.50 max (residual, not intentional)
PREN	42.5 typical	41 to 43

Outokumpu's published datasheet for Avesta 2507 sits at the centre of the UNS S32750 chemistry window, delivering consistent PREN of approximately 42.5 in mill heats.

Avesta 2507 Product Range

Outokumpu supplies Avesta 2507 in:

Plate (Outokumpu Avesta mill specialty, hot-rolled and cold-rolled, including thick plate)
Sheet, strip and coil (Outokumpu's primary stainless product line)
Quarto plate (heavy plate from Avesta mill)
Welding consumables (Avesta Welding subsidiary, P5 and other coated electrodes; matching wire)
Bar (round, in selected sizes from licensed re-rolling)

Outokumpu's Avesta Welding division (formerly Avesta Welding AB) is a major supplier of duplex and super duplex welding consumables, including the P5 coated electrode for SMAW (covered electrode) welding of UNS S32750.

Standards Avesta 2507 Meets

Standard	Designation
UNS	S32750
EN 10088-3	1.4410 / X2CrNiMoN25-7-4
EN 10088-2 (sheet, plate, strip)	1.4410
ASTM A240 (plate)	UNS S32750
ASTM A479 (bar)	UNS S32750
ASTM A182 (forgings)	F53
NORSOK M-630	MDS D55, D57
NORSOK M-650	Manufacturer qualification (QTR)
NACE MR0175 / ISO 15156	Sour service compliance

TorqBolt Sourcing of Avesta 2507

TorqBolt sources Avesta 2507 from Outokumpu authorised distributors for project supplies that specifically call out the Avesta 2507 trademark. Mill test certificates show the Outokumpu mill heat number and full traceability back to the Avesta or Tornio mill of origin. Avesta 2507 is particularly relevant for projects requiring plate, sheet and strip from the Outokumpu Avesta works. For projects that accept any UNS S32750-compliant material, TorqBolt also stocks UNS S32750 from other licensed mills (Sandvik SAF 2507, Industeel UR 52N+) at the Mumbai warehouse.

Avesta 2507 Frequently Asked Questions

What is Avesta 2507?

Avesta 2507 is the Outokumpu trademark for super duplex stainless steel with chemistry identical to UNS S32750 (American) and Werkstoff 1.4410 (European). Composition is 25Cr-7Ni-4Mo-0.27N nominal, with no intentional copper or tungsten. PREN is approximately 42.5. The grade is widely cited in pulp and paper, desalination and offshore oil and gas project specifications.

Who owns the Avesta 2507 trademark?

Avesta 2507 is supplied by Outokumpu Oyj (Finland). Outokumpu acquired Avesta Sheffield (formerly Avesta AB of Sweden) in 2001, and the Avesta mill continues to produce super duplex stainless steel as part of Outokumpu's stainless steel business.

Is Avesta 2507 the same as UNS S32750?

Yes. Avesta 2507 is the Outokumpu trademark for the chemistry registered as UNS S32750 (American) and Werkstoff 1.4410 (European). The chemistry, mechanical properties and corrosion resistance are identical to UNS S32750 from other licensed mills. Mill test certificates show dual UNS / EN designation.

Where is Avesta 2507 manufactured?

Outokumpu's Avesta mill in central Sweden is the primary production site for Avesta 2507 plate, sheet and strip. The Tornio mill in Finland is the parent integrated works. The Avesta Welding subsidiary supplies matching welding consumables. All Avesta 2507 carries the Outokumpu mill heat number and full traceability on the EN 10204 Type 3.1 mill test certificate.

Can Avesta 2507 be substituted with SAF 2507 or UR 52N+?

Functionally, yes. Avesta 2507 (Outokumpu), SAF 2507 (Sandvik) and UR 52N+ (Industeel) all certify to UNS S32750 / 1.4410. Mill chemistry, mechanical properties and corrosion resistance are equivalent. However, project specifications that name Avesta 2507 by trademark may not accept material from other mills without engineering approval. Always check the project material requisition.

Which standards does Avesta 2507 meet?

UNS S32750, EN 10088-3 (1.4410), EN 10088-2 (sheet, plate, strip), ASTM A240 (plate), A479 (bar), A790 (pipe), A815 (fittings WP-S32750), A182 F53 (forgings), NORSOK M-630 MDS D55 / D57, NORSOK M-650 (QTR), NACE MR0175 / ISO 15156-3 (sour service).

What welding consumables does Outokumpu supply for Avesta 2507?

Outokumpu's Avesta Welding subsidiary supplies the P5 coated electrode for SMAW welding of UNS S32750 / 1.4410. Matching welding wire (Avesta 2507/P100) is available for GTAW, GMAW and SAW processes. The fillers are nitrogen-enhanced and slightly overmatching, equivalent in function to ER2594 per AWS A5.9.

Standards

Surface Treatments

Certifications

ISO 9001 - 2015 Certified
PED 2014/68/EC
NACE MR0175 / ISO 15156-2
NORSOK M-650 Qualified
API 6A Certified
DFAR
MERKBLATT AD 2000 W2/W7/W10

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