What is 2507 duplex stainless steel forging?
Oct 20, 2026
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What Is 2507 Duplex Stainless Steel Forging?
Forging of 2507 duplex stainless steel is a process involving the heating and plastic deformation of super duplex stainless steel UNS S32750 (EN 1.4410) under controlled conditions, used to manufacture high-strength components such as flanges, valve bodies, shafts, rings, and pressure vessel parts. Typically containing 25% chromium, 7% nickel, 4% molybdenum, and 0.24–0.32% nitrogen, the material-in its solution-annealed condition-generally provides a minimum yield strength of approximately 550 MPa and a tensile strength of 800–1,000 MPa, depending on the applicable product standards and testing requirements.
ASTM A1820 F53 Duplex stainless steel forging specification
| Standard | Designation |
|---|---|
| UNS | S32750 |
| EN / DIN | 1.4410 (X2CrNiMoN25-7-4) |
| ASTM / ASME | A182 / A182M (F53), A815 / A815M, A240, A276, A479, A744 |
| Common Trade Name | SAF 2507 / Super Duplex 2507 / F53 |
| Forging Products | Flanges, fittings, rings, discs, blocks, shafts, valve bodies |
| NACE / ISO | NACE MR0175 / ISO 15156 (sour service) |
| ASME B16.5 | Forged flanges & flanged fittings |
| ASME B16.9 | Butt-welding forged fittings |
2507 Forging Process & Heat Treatment
| Step | Parameter | Detail |
| Billet heating | 1 100 – 1 230 °C | Hot forging window; final reduction must finish > 950 °C |
| Forging ratio | ≥ 4.5 : 1 (general); ≥ 5 : 1 (API 6A) | Documented per forging plan; verified by macrostructure |
| Solution anneal | 1 040 – 1 100 °C, hold 2 – 4 h, agitated water quench (< 60 s transfer) | Restores 50/50 ferrite-austenite balance |
| Post-weld HT | NOT recommended | σ-phase risk above 300 °C |
| Final condition | Annealed (A) | Hardness ≤ 32 HRC (general); ≤ 28 HRC (NACE sour service) |
Chemical Composition (ASTM A182 F53 / EN 10088-4)
| Element | ASTM A182 F53 (wt. %) | EN 10088-4 (1.4410) |
| C | ≤ 0.030 | ≤ 0.030 |
| Si | ≤ 0.80 | ≤ 1.00 |
| Mn | ≤ 1.20 | ≤ 2.00 |
| P | ≤ 0.035 | ≤ 0.035 |
| S | ≤ 0.020 | ≤ 0.015 |
| Cr | 24.0 – 26.0 | 24.0 – 26.0 |
| Ni | 6.0 – 8.0 | 6.0 – 8.0 |
| Mo | 3.0 – 5.0 | 3.0 – 4.5 |
| N | 0.24 – 0.32 | 0.24 – 0.32 |
| Cu | ≤ 0.50 | - |
| Fe | Balance | Balance |
Mechanical Properties (Solution-Annealed Forging)
| Property | ASTM A182 F53 (min) | EN 10088-4 (1.4410) | NORSOK M-630 (min) |
| Tensile Rm | 800 MPa (116 ksi) | 730 – 1 000 MPa | 800 MPa |
| Yield Rp0.2 | 550 MPa (80 ksi) | ≥ 530 MPa | 550 MPa |
| Elongation (50 mm) | 15 % | ≥ 25 % | 25 % |
| Reduction of area | 45 % | - | - |
| Hardness | ≤ 32 HRC (≤ 270 HB) | ≤ 32 HRC | ≤ 30 HRC (NACE: ≤ 28) |
| Charpy V-notch, 20 °C | 80 J (full set) | 100 J | 77 J |
| Charpy V-notch, −46 °C | 45 J (full set); 35 J avg | - | 35 J avg (3 specimens) |
| Ferrite content | 35 – 55 vol % (ASTM E562) | 35 – 55 vol % | 35 – 65 vol % |
Applications for 2507 Forgings
| Industry | Typical Forged Components |
| Oil & Gas (offshore / subsea) | Wellhead bodies, Christmas trees, manifolds, jumpers, spools, flanges (Class 900 – 2500) |
| Marine / Desalination | Seawater cooling headers, RO high-pressure flanges, brine concentrator tube sheets |
| Chemical Processing | Reactor spools, heat exchanger tube sheets (HCl / H₂SO₄ / chloride service) |
| Power / FGD | Flue-gas desulphurisation absorber internals, quencher tube sheets |
| Mining / Acid | Acid slurry pump impellers, valve bodies, spool pieces |
2507 Forging Product Range
| Product | Typical Sizes | Governing Standard | Application |
| Weld-neck flanges (WNRF) | ½" – 56" NB, Class 150 – 2500 | ASME B16.5, B16.47, EN 1092-1 | Piping, wellhead |
| Slip-on flanges (SORF) | ½" – 36" NB, Class 150 – 1500 | ASME B16.5, EN 1092-1 | General piping |
| Blind flanges (BLRF) | ½" – 48" NB, Class 150 – 2500 | ASME B16.5, EN 1092-1 | Line ends, test |
| RTJ flanges | 4" – 48" NB, Class 600 – 2500 | ASME B16.5, B16.47 | High-pressure |
| Socket-weld flanges (SWRF) | ½" – 4" NB, Class 300 – 900 | ASME B16.5 | Small-bore |
| Threaded flanges (TEF) | ½" – 4" NB | ASME B16.5 | Instrument |
| Tube sheets / tube plates | Φ 300 – 2 500 mm | EN 10088-4, ASTM A182 | Heat exchangers, separators |
| Spools / discs | Φ 200 – 1 500 mm | ASTM A182 F53 | Vessels, reactors |
| Forged bar / rounds | Φ 100 – 800 mm | ASTM A182 F53, EN 10088-3 | Shafts, mandrels, custom parts |
| Wellhead / Christmas tree bodies | Per API 6A | API 6A Annex F | Subsea / surface wellhead |
| Manifold bodies / jumpers | Per project drawing | NORSOK M-630 | Subsea |
| Baffles / support plates | Custom | EN 10088-4 | Exchangers, columns |
If you need to make further purchases of 2507 forgings, please let me know:
• What specific type of forging are you looking for (e.g., flanges, valve bodies, rings, or shafts)?
• Are there any specific standards that must be met (such as ASME, ASTM, or NACE standards for H2S-containing environments)?
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