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
ASTM A182 F53, Super Duplex 2507 Forgings, Flanges, Forged Fittings
ASTM A182 grade F53 covers wrought super duplex stainless steel forgings, flanges, and forged fittings of UNS S32750. F53 is the canonical forging spec for super duplex 2507. F53 is NOT F55, F55 covers UNS S32760 (Zeron 100), a different alloy with copper and tungsten additions. Mistaking one for the other is the most common procurement error in super-duplex projects, because the chemistry, PREN formula, and certifying mill datasheets all differ.
Material supplied to ASTM A182 F53 is solution-annealed at 1040 to 1100 degrees Celsius and water-quenched. Ferrite content per NORSOK M-630 must remain between 35 and 55 percent in the base material. Hardness limit is 28 HRC for sour-service compliance per NACE MR0175 / ISO 15156-3. Charpy V-notch impact at minus 46 degrees Celsius must be 45 J minimum per NORSOK M-630.
ASTM A182 F53 Scope
A182 grade F53 applies to forged or rolled alloy and stainless steel pipe flanges, forged fittings, and valves and parts for high-temperature service. Within A182, grade F53 specifically covers UNS S32750 super duplex stainless steel. The full A182 standard governs chemistry, mechanical properties, heat treatment, marking, and traceability for wrought ferritic and ferritic-austenitic stainless steels.
ASTM A182 F53 Chemical Composition
F53 chemistry mirrors UNS S32750 within negligible tolerance. The defining absence of copper and tungsten distinguishes F53 from F55 (S32760) and F61 (S32550).
| Element | F53 Min % | F53 Max % |
|---|---|---|
| Carbon (C) | (no min) | 0.030 |
| Manganese (Mn) | (no min) | 1.20 |
| Phosphorus (P) | (no min) | 0.035 |
| Sulfur (S) | (no min) | 0.020 |
| Silicon (Si) | (no min) | 0.80 |
| 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 intentional addition (key distinguisher from F55 and F61) | |
| Tungsten (W) | No intentional addition (key distinguisher from F55) | |
ASTM A182 F53 Mechanical Requirements
| Property | F53 Minimum | Test Standard |
|---|---|---|
| Tensile strength | 795 MPa (115 ksi) | ASTM A370 |
| Yield strength (0.2 percent offset) | 550 MPa (80 ksi) | ASTM A370 |
| Elongation in 50 mm | 15 percent | ASTM A370 |
| Reduction of area | 25 percent | ASTM A370 |
| Hardness (sour-service) | 28 HRC max | ASTM E18, NACE MR0175 |
| Charpy V-notch at minus 46 degrees Celsius | 45 J min (full set) | NORSOK M-630, ASTM E23 |
ASTM A182 F53 Heat Treatment
Solution annealing at 1040 to 1100 degrees Celsius followed by rapid water quench. There is no precipitation hardening, no aging, and no temper. The water quench must drive the forging through the 600 to 1000 degrees Celsius critical band rapidly to suppress sigma-phase precipitation. Heavy section forgings above 100 mm thickness require careful quench design to ensure the centre cools fast enough.
ASTM A182 F53 Required Tests
- Chemical analysis on the heat (ladle plus product analysis if specified)
- Tensile test per ASTM A370 at room temperature
- Hardness test (Brinell or Rockwell HRC) at the recommended location for sour-service compliance per NACE MR0175
- Charpy V-notch impact test at minus 46 degrees Celsius per NORSOK M-630
- Microstructural examination for ferrite content per ASTM E562 (35 to 55 percent in base, 35 to 65 percent in weld)
- Intergranular corrosion test per ASTM A923 Method A or G48 Method A as agreed
- Heat treatment certification per A182 paragraph 6 (solution-anneal time-temperature record)
F53 vs F55 vs F51, Don't Confuse These Forging Grades
A182 lists multiple duplex and super duplex grades. They are not interchangeable.
| A182 Grade | UNS | Common Name | Cu | W | PREN |
|---|---|---|---|---|---|
| F53 | S32750 | Super Duplex 2507 | None | None | 41 to 43 |
| F55 | S32760 | Zeron 100 | 0.5 to 1.0 | 0.5 to 1.0 | 41 to 44 |
| F61 | S32550 | Ferralium 255 | 1.5 to 2.5 | None | 38 to 42 |
| F51 | S31803 / S32205 | Duplex 2205 | None | None | 34 to 38 |
| F60 | S32205 | Duplex 2205 (revised) | None | None | 35 to 38 |
A purchase order calling for ASTM A182 F53 must be filled with UNS S32750 material. Substituting F55 changes the alloy chemistry (introduces Cu and W) and is a non-conformance unless the customer specification explicitly permits the substitution.
Products Manufactured to ASTM A182 F53
- Flanges, weld neck, slip-on, blind, socket weld, threaded, lap joint per ANSI B16.5 and B16.47
- Open-die forgings, billet, bar, ring, disc
- Forged fittings, coupling, elbow, tee, reducer, cap (socket weld and threaded per ASME B16.11)
- Forged stud bolts and heavy hex bolts for critical service (companion to stud bolts and heavy hex bolts)
- Valve bodies and trim parts for super duplex valve manufacturers
Related Standards
- ASTM A479, UNS S32750 bar and shapes
- ASTM A790, UNS S32750 pipe
- ASTM A815 WP-S32750, wrought pipe fittings
- EN 10088-3 / 1.4410, European equivalent
- NORSOK M-630, material data sheet
- NORSOK M-650, manufacturer qualification
- NACE MR0175, sour-service compliance
- API 6A, wellhead equipment
ASTM A182 F53 Frequently Asked Questions
What does ASTM A182 F53 cover?
ASTM A182 F53 covers wrought super duplex stainless steel forgings, flanges, and forged fittings of UNS S32750. The material is solution annealed at 1040 to 1100 degrees Celsius and water quenched. F53 is the canonical forging spec for super duplex 2507.
Is F53 the same as F55?
No. F53 covers UNS S32750 (super duplex 2507) which has no copper and no tungsten. F55 covers UNS S32760 (Zeron 100) which contains nominal 0.7 percent each of copper and tungsten. The two are different alloys and not interchangeable. A purchase order calling for F53 cannot be filled with F55 unless the customer specification explicitly permits substitution.
What is the heat treatment for ASTM A182 F53?
Solution annealing at 1040 to 1100 degrees Celsius followed by rapid water quench. There is no precipitation hardening, no aging, no temper. The quench must drive the forging through the 600 to 1000 degrees Celsius band rapidly to suppress sigma-phase precipitation.
What hardness limit applies to F53 for sour service?
28 HRC maximum per NACE MR0175 / ISO 15156-3, with ferrite content within 35 to 65 percent. Specific H2S partial pressure and chloride limits depend on the application zone classification.
What tests are required for F53?
Chemical analysis, tensile test per ASTM A370, hardness test, Charpy V-notch impact at minus 46 degrees Celsius (45 J minimum per NORSOK M-630), ferrite content per ASTM E562, intergranular corrosion test per ASTM A923 Method A or G48 Method A as agreed, and heat-treatment certification.
Which mills produce ASTM A182 F53 forgings?
Forging billet sourced from Sandvik (SAF 2507), Industeel ArcelorMittal (UR 52N+), and Outokumpu (Avesta 2507). Indian and European forge shops routinely produce F53 forgings to customer drawings.
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