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
Super Duplex 2507 Forgings, UNS S32750 ASTM A182 F53
Super Duplex 2507 forgings in UNS S32750 (EN 1.4410) cover the open-die and closed-die forged components used on subsea production systems, oilfield wellheads, valve bodies, pump casings, manifolds and the heavier pressure-retaining hardware where rolled or cast 2507 cannot meet the toughness, grain flow and section-size requirements. TorqBolt sources 2507 forgings from qualified open-die press shops and closed-die forge houses, supplied with EN 10204 Type 3.1 mill certificates, Type 3.2 third-party-witnessed on request, and NORSOK M-650 QTR where the project specification calls it out.
Forgings are supplied to ASTM A182 grade F53 for forged stainless steel piping components and ASME SA-182 for ASME Section VIII pressure-vessel construction. EN 10222-5 governs European pressure-purpose forgings. Sour-service certification per NACE MR0175 / ISO 15156-3 is standard practice for oilfield forgings.
Super Duplex 2507 Forging Forms
| Forging Form | Size Range | Method |
|---|---|---|
| Open-die round bar / billet | 200 mm to 800 mm diameter | Open-die press, multi-blow upset and draw |
| Open-die ring | OD up to 1500 mm, wall to 250 mm | Ring rolling on mandrel, post-pierce expansion |
| Open-die disc | OD up to 1200 mm, thickness to 300 mm | Upsetting between flat dies |
| Closed-die forging (drawing-specific) | Per drawing, typical 5 to 500 kg | Hammer or press, near-net shape |
| Forged flange blank | NPS 1/2" to 60" | Open-die or closed-die per ASME B16.5 / B16.47 |
| Forged valve body | NPS 1/2" to 24" | Closed-die per drawing, machined to API 6A |
Super Duplex 2507 Forging Chemistry per ASTM A182 F53
Per ASTM A182 grade F53 / UNS S32750: 25Cr-7Ni-3.5Mo-0.3N. Copper is restricted to 0.50 max as residual, not intentional. PREN of 41 or higher.
| Element | F53 Min % | F53 Max % |
|---|---|---|
| Carbon | (no min) | 0.030 |
| Chromium | 24.0 | 26.0 |
| Nickel | 6.0 | 8.0 |
| Molybdenum | 3.0 | 5.0 |
| Nitrogen | 0.24 | 0.32 |
| Copper | (no min) | 0.50 max, residual, not intentional |
| Manganese | (no min) | 1.20 |
| Silicon | (no min) | 0.80 |
Super Duplex 2507 Forging Mechanical Properties
| Property | Minimum | Test Standard |
|---|---|---|
| Tensile strength | 795 MPa (115 ksi) | ASTM A370 |
| Yield strength | 550 MPa (80 ksi) | ASTM A370 |
| Elongation in 50 mm | 15 percent | ASTM A370 |
| Hardness | 32 HRC max forging, 28 HRC max NACE | NACE MR0175 |
| Charpy V-notch at minus 46 C | 45 J min full set, 35 J avg three specimens | NORSOK M-630, ASTM E23 |
| Ferrite content | 35 to 55 percent base metal | ASTM E562 |
| Grain size | Equal to or finer than ASTM 4 | ASTM E112 |
| Pitting (G48 Method A) | No pitting at 50 C, 24 h | ASTM G48 |
Forging Practice and Heat Treatment
- Forging window 1100 to 1230 degrees Celsius. Heating cycle controlled to avoid grain coarsening above 1230 C and sigma-phase precipitation below 1000 C.
- Final reduction must finish above 950 degrees Celsius so the duplex austenite-ferrite balance stays within target. Reheats are permitted but each cycle adds risk of grain growth.
- Solution annealing at 1040 to 1100 degrees Celsius followed by water quench. Heavy sections (above 250 mm) are quenched in agitated water with quench delay below 60 seconds.
- Mandatory G48 Method A pitting test on each heat-treatment lot for NORSOK M-630 acceptance.
- Test sample location: T/4 (one-quarter wall thickness) per NORSOK M-630 for tensile and impact, surface and core for ferrite count.
NORSOK M-650 Manufacturer Qualification
NORSOK M-650 governs the qualification of manufacturers of special materials including super duplex 2507. The Qualification Test Record (QTR) is valid for 5 years subject to essential variable control (chemistry envelope, heat-treatment cycle, maximum qualified section size, mill of origin and product form). M-650 QTR is mandatory for super duplex forgings supplied to Norwegian Continental Shelf projects and is widely required by major North Sea operators. TorqBolt holds qualified-vendor relationships with M-650 QTR forge houses for sizes from small flange blanks up to 800 mm forged bar and large open-die rings.
Super Duplex 2507 Forging Applications
- Subsea manifold blocks, christmas tree forgings, wellhead and tubing-head spools per API 6A and 17D
- Forged flange blanks for ASME B16.5 and B16.47 weld-neck and blind flanges
- Forged valve bodies, bonnets, stems and trim per API 6A and API 600
- Pump casings, impeller hubs and seal-gland forgings
- Heat-exchanger tube-sheet forging stock and channel covers
- Closed-die forged fittings (elbows, tees, blocks) for high-pressure manifolds
Related Products and Standards
- Super Duplex 2507 flanges finished forged flanges
- Super Duplex 2507 fittings per A815 WP-S32750
- Super Duplex 2507 forged bar billet stock
- Super Duplex 2507 pipe per A790
- Super Duplex 2507 stud bolts
- ASTM A182 F53 reference
- NORSOK M-630 datasheet
Super Duplex 2507 Forging FAQ
Which standards cover 2507 forgings?
ASTM A182 grade F53 (forged stainless steel piping components), ASME SA-182 (Section VIII pressure vessels), EN 10222-5 (forgings for pressure purposes), NORSOK M-630 (material data sheet), NORSOK M-650 (qualification of manufacturers), API 6A (wellhead equipment), API 17D (subsea), API 6D (pipeline valves) and NACE MR0175 / ISO 15156-3 for sour service.
What is the forging temperature window for 2507?
1100 to 1230 degrees Celsius. Final reduction must finish above 950 degrees Celsius. Heating above 1230 C causes grain coarsening; finishing below 950 C unbalances the duplex austenite-ferrite ratio and lowers Charpy toughness.
When is NORSOK M-650 QTR required?
For all super duplex forgings supplied to projects on the Norwegian Continental Shelf and for many North Sea operators worldwide (Equinor, Shell, BP, ConocoPhillips, Total). The QTR is valid 5 years subject to essential variable control. Forgings outside the qualified envelope require a fresh QTR or extended qualification.
What test sample location does 2507 forging use?
T/4 (one-quarter wall thickness) per NORSOK M-630 for tensile and Charpy impact, oriented transverse to the principal forging direction. Ferrite count is taken at the surface and at the core to confirm 35 to 55 percent across the section. Pitting test (G48 Method A) is at the T/4 location.
Are 2507 forgings suitable for sour service?
Yes, qualified per NACE MR0175 / ISO 15156-3 with 28 HRC max hardness and ferrite content within 35 to 65 percent. The application zone (1, 2 or 3), H2S partial pressure and chloride limits are reported on the EN 10204 Type 3.1 or 3.2 certificate when ordered with NACE compliance.
Does 2507 forging contain copper?
No, copper is not an intentional alloying element in UNS S32750. ASTM A182 F53 permits 0.50 max as residual, not intentional. Copper-bearing super duplex grades are Zeron 100 (S32760, ASTM A182 F55) and Ferralium 255 (S32550, ASTM A182 F61), which are different alloys with different forging specifications and different application envelopes.
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