ASTM A928 UNS S32750 CL1 Super Duplex Stainless Steel Pipe EFW Welded Pipe
ASTM A928 UNS S32750 Class 1 Super Duplex Stainless Steel EFW Pipe
ASTM A928 is essential for industries requiring high strength and exceptional corrosion resistance in welded pipes. This specification covers five classes of duplex steel pipes, each with specific welding and radiography requirements. Pipes are commonly used in industries like oil and gas, chemical processing, marine environments, and power generation due to its excellent performance in corrosive and high-stress applications.
Classes of ASTM A928 S32750 Duplex Steel Electric Fusion Welded / EFW Pipe
| Class type | Welding | Filler Metal | Radiography Test |
|---|---|---|---|
ASTM A928 | Double welded with filler metal | Yes | 100% |
ASTM A928 | Double welded with filler metal | Yes | NA |
ASTM A928 | Single welded with filler metal | Yes | 100% |
ASTM A928 | Single Welded without addition filler metal | Without filler (Root pass to be done) | 100% |
ASTM A928 | Double welded with filler metal | Yes | Spot |
Chemical Composition of A928 S32750 Duplex Steel Electric Fusion Welded / EFW Pipe
| UNS Number Duplex Grades | Si | Mn | P | Typeb | N | Cu | Other | S | Cr | Ni | C | Mo |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| S32750 | 0.80 | 1.20 | 0.035 | 2507 | 0.24-0.32 | 0.50 | 0.020 | 24.0-26.0 | 6.0-8.0 | 0.030 | 3.0-5.0 |
Tensile & Yield strength of A928 S32750 Duplex Steel Electric Fusion Welded / EFW Pipe
| UNS | Yield Strength | Tensile Strength |
|---|---|---|
ASTM A928 UNS S32750 | 80 Ksi 550 Mpa | 116 Ksi 800 Mpa |
Heat treatment of A928 UNS S32750 Duplex Steel Electric Fusion Welded / EFW Pipe
| UNS | Temperature range |
|---|---|
ASTM A928 UNS S32750 | 1880-2060 °F 1025-1125 °C |
UNS S32750 Duplex Steel Pipe, Fitting and Flange
| EFW pipe standard | Seamless pipe | Buttweld Fittings | Flanges |
|---|---|---|---|
| ASTM A928 UNS S32750 | ASTM A790 UNS S32750 | ASTM A815 UNS S32205 | ASTM A182 F60 |
Here are the main differences between ASTM A790 and ASTM A928
ASTM A790
Scope:
Covers welded and seamless ferritic-austenitic (duplex) stainless steel pipe intended primarily for use in pressure applications.
Material Grades:
Focuses on specific grades (e.g., UNS S31803, UNS S32205) that typically have a higher yield strength and are compatible with higher pressures and temperatures.
Applications:
Commonly used in oil and gas industries, chemical processing, and other pressure vessel applications where strength and corrosion resistance under pressure are critical.
Testing Requirements:
Emphasizes rigorous testing for mechanical properties, such as yield strength and tensile strength, ensuring the pipe can withstand high-pressure conditions.
ASTM A928
Scope:
Specifically focuses on welded pipe made from duplex stainless steel for applications requiring corrosion resistance but may not involve the same pressure requirements as A790.
Material Classes:
Divided into five classes (as previously mentioned), which offer various compositions and mechanical properties tailored to different applications.
Applications:
Generally suited for less demanding environments where resistance to pitting and stress corrosion cracking is a priority, such as in certain chemical environments or marine applications.
Testing Requirements:
While still requiring mechanical property evaluations, the focus is more on specific corrosion resistance tests rather than just high-pressure performance.
Chemical Processing Plants
Refinery and Petrochemical Industries
Desalination Plants
Marine Applications
Power Generation
Water Treatment Facilities
Pharmaceutical Industry
Food Processing
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