ASTM A815 S32750 / SAF 2507 Cap, Super Duplex Butt Weld Pipe Fitting For Offshore Oil And Gas Platforms
ASTM A815 S32750 / SAF 2507 Cap, Super Duplex Butt Weld Pipe Fitting For Offshore Oil And Gas Platforms
Overwiew of ASTM A815 S32750 / SAF 2507 Cap
The ASTM A815 S32750 cap is a butt-weld fitting manufactured from super duplex stainless steel, designated as UNS S32750 or SAF 2507 (1.4410). Designed to seal pipe ends in high-pressure and highly corrosive environments, it offers exceptional mechanical strength and outstanding corrosion resistance.
With a PRE (pitting resistance equivalent) value exceeding 40, it provides superior resistance to pitting, crevice corrosion, and stress corrosion cracking, particularly in chloride-rich environments such as seawater and chemical processing applications. Manufactured in accordance with ASME B16.9 dimensional standards, the cap undergoes solution annealing treatment at 1025–1125°C followed by rapid cooling to maintain its optimal dual-phase microstructure (50% ferrite / 50% austenite).
This fitting is widely used in offshore platforms, seawater desalination plants, chemical processing, and oil & gas industries where reliability under extreme conditions is critical.
Chemical Composition of ASTM A815 S32750
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Fe |
| S32750 |
0.030 max |
1.20max |
0.80 max |
0.035 max |
0.020 max | 24.0-26.0 | 3.00 - 5.00 | 6.00-8.00 | 0.24-0.32 | 58.095 min |
Mechanical Properties of ASTM A815 S32750 Cap
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 7.8 g/cm3 | 1350 °C (2460 °F) | Psi – 116000 , MPa – 800 | Psi – 80000 , MPa – 550 | 15 % |
ASTM A815 S32750 Equivalent Grades
|
Standard/Region |
Equivalent Grade |
Remarks |
|---|---|---|
|
ASTM/UNS (USA) |
UNS S32750, ASTM A182 F53 |
Core equivalent, interchangeable |
|
EN/DIN (Europe) |
1.4410, X2CrNiMoN25-7-4 |
Most commonly used in Europe |
|
GB (China) |
S25073, 022Cr25Ni7Mo4N |
Chinese national standard |
|
Commercial Grade
|
SAF 2507 |
Universal commercial name |
Applications of ASTM A815 S32750 / SAF 2507 Cap
|
Industry
|
Specific Application Scenarios |
|
Oil & Gas
|
Offshore platforms, oil/gas gathering pipelines, acidic oilfields (with H2S), wellhead equipment
|
|
Marine/Offshore
|
Marine engineering, ship pipelines, offshore wind power, seawater pipelines
|
|
Desalination
|
Seawater desalination plants, high-chloride water treatment pipelines
|
|
Chemical Industry
|
Chemical processing, corrosive medium pipelines, acid-base storage and transportation systems
|
|
Other
|
Nuclear power, papermaking, high-pressure corrosive pipelines
|
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