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 Bar Stock, UNS S32750
Super Duplex 2507 bar in UNS S32750 (EN 1.4410, X2CrNiMoN25-7-4) covers round, hex, square, flat, hollow and forged sections supplied as machining and forging stock. TorqBolt holds 2507 bar in all five common geometries at the Mumbai warehouse, with mill test certificates per EN 10204 Type 3.1 and Type 3.2 third-party-witnessed on request.
The bar is supplied to ASTM A479 for stainless steel bar, ASTM A276 for shapes, and ASTM A182 grade F53 for forged billet. Sour-service certification per NACE MR0175 / ISO 15156-3 is available with controlled hardness and ferrite balance.
Super Duplex 2507 Bar Forms and Sizes
| Form | Size Range | Standard |
|---|---|---|
| Round bar | 6 mm to 600 mm | ASTM A479, A276, A182 F53 |
| Hex bar | 5 mm to 100 mm across flats | ASTM A479, A276 |
| Square bar | 6 mm to 200 mm | ASTM A479, A276 |
| Flat bar | 10 to 200 mm wide, 3 to 80 mm thick | ASTM A479, A276 |
| Hollow bar | OD 25 to 350 mm, bore 12 to 250 mm | ASTM A511 / A789 customised |
| Forged bar | 200 mm to 800 mm | ASTM A182 F53 |
Super Duplex 2507 Bar Chemistry per ASTM A479
Chemistry mirrors 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 | A479 Min % | A479 Max % |
|---|---|---|
| Carbon (C) | (no min) | 0.030 |
| Chromium (Cr) | 24.0 | 26.0 |
| Nickel (Ni) | 6.0 | 8.0 |
| Molybdenum (Mo) | 3.0 | 5.0 |
| Nitrogen (N) | 0.24 | 0.32 |
| Copper (Cu) | (no min) | 0.50 max, residual, not intentional |
| Manganese (Mn) | (no min) | 1.20 |
| Phosphorus (P) | (no min) | 0.035 |
| Sulfur (S) | (no min) | 0.020 |
Super Duplex 2507 Bar Mechanical Properties
| Property | Minimum | Test Standard |
|---|---|---|
| Tensile strength | 800 MPa (116 ksi) | ASTM A370 |
| Yield strength (0.2 percent offset) | 550 MPa (80 ksi) | ASTM A370 |
| Elongation in 50 mm | 15 percent | ASTM A370 |
| Hardness | 32 HRC max bar, 28 HRC max NACE service | NACE MR0175 |
| Charpy V-notch at minus 46 degrees Celsius | 45 J min | NORSOK M-630, ASTM E23 |
| Ferrite content | 35 to 55 percent base metal | ASTM E562 |
Heat Treatment
Solution annealing at 1040 to 1100 degrees Celsius followed by water quench. There is no precipitation hardening, no aging step. Quench delay or air cooling on heavy sections allows sigma phase to nucleate and cuts Charpy toughness sharply, so heavy forged bar is quenched directly in agitated water.
Super Duplex 2507 Bar Applications
- Pump shafts, valve stems, impellers and seal sleeves for chloride and sour service
- Fastener blanks for stud bolts, hex bolts, nuts and screws
- Forging stock for flanges, fittings, manifolds and subsea hardware
- Hollow bar for short-run pipe, sleeves and bored couplings
- Tube sheet inserts, weld-overlay cores and instrument fittings
Related Products and Standards
- Super Duplex 2507 round bar
- Super Duplex 2507 hex bar
- Super Duplex 2507 flat bar
- Super Duplex 2507 square bar
- Super Duplex 2507 hollow bar
- Super Duplex 2507 forged bar
- Super Duplex 2507 cold finished bar
- ASTM A479 reference
Super Duplex 2507 Bar FAQ
Which standards cover 2507 bar stock?
ASTM A479 (bar for pressure vessels), ASTM A276 (shapes), ASTM A182 grade F53 (forged billet), EN 10088-3 Werkstoff 1.4410, NORSOK M-630 (material data sheet) and NACE MR0175 / ISO 15156-3 for sour service.
Which bar geometry should I order for fasteners?
Hex bar for nuts and short fittings, round bar for stud bolts and screws, square or flat for keys and plates. Cold-finished round in 6 to 36 mm is the typical fastener blank stock; hex from 8 mm to 65 mm covers most A194 grade 7A nut sizes.
What is the difference between hot-rolled and cold-finished 2507 bar?
Hot-rolled bar carries scale, looser tolerance (ASTM A484) and is used for forging stock. Cold-finished bar (drawn, peeled or ground) carries a bright finish, tighter tolerance (h9 / h11 typical) and is used directly in CNC turning and threading without further machining of the OD.
Can 2507 bar be used in sour service?
Yes, qualified per NACE MR0175 / ISO 15156-3 with hardness 28 HRC max and ferrite 35 to 65 percent. The certificate states the application zone, H2S partial pressure and chloride content envelope when ordered with NACE compliance.
Does 2507 bar contain copper?
No, copper is not an intentional alloying element in UNS S32750. ASTM A479 permits 0.50 max as residual, not intentional. Copper-bearing super duplex grades are Zeron 100 (S32760) and Ferralium 255 (S32550), supplied separately.
What mill certificates ship with 2507 bar?
EN 10204 Type 3.1 mill test certificate is standard, traceable to the original heat number, with chemistry, mechanicals, hardness, ferrite count and heat-treatment record. Type 3.2 third-party-witnessed (Lloyds, DNV, BV, ABS, TUV) is available on request and is the norm for NORSOK M-650 QTR-qualified supplies.
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