ASTM A928 CL.1 Super Duplex Steel Welded Pipes S32750 S32205 S31254

Key Features of ASTM A928 Pipes

- Manufacturing Process:

- Electric Fusion Welding (EFW) with filler metal added (e.g., SAW, TIG).

Welds are heat-treated to restore duplex microstructure and corrosion resistance.

- Testing Requirements:

- Hydrostatic Testing: Mandatory for all pipes.

- Non-Destructive Examination (NDE): Radiography or ultrasonic testing for welds.

- Mechanical Testing: Tensile, hardness, and impact tests.

Classes of ASTM A928 Welded / EFW Pipe

Duplex Stainless Steel have a structure that contains both ferrite and austenite.

Duplex alloys have higher strength and better stress corrosion cracking resistance than most austenitic alloys and greater toughness than ferritic alloys, especially at low temperatures.

The corrosion resistance of duplex alloys depends primarily on their composition, especially the amount of chromium, molybdenum, and nitrogen they contain.

Application:

• Oil & Gas: Subsea pipelines, risers, and sour service (H₂S-containing) environments.
• Chemical Processing Acid tanks, heat exchangers.
• Desalination Plants: Seawater intake and brine handling.
• Pulp & Paper: Bleaching equipment.
• Marine: Shipbuilding and offshore platforms.

Key Benefits of ASTM A928 Pipes

• High Strength-to-Weight Ratio**: Allows thinner walls, reducing material costs.
• Stress Corrosion Cracking (SCC) Resistance**: Ideal for chloride-rich or high-temperature environments.
• Longevity: Minimal maintenance compared to carbon steel or 300-series SS.
• Compliance: Meets NACE MR0175/ISO 15156 for sour service.