ASTM A928 Duplex Stainless Steel EFW Pipes (Electric Fusion Welded Pipes)

ASTM A928 / ASME SA928 Duplex & Super Duplex EFW Pipe

Large-OD EFW — S31803 / S32205 / S32750 / S32760

Savoy Piping Inc. supplies ASTM A928 EFW duplex and super duplex pipe for seawater, offshore and chloride process headers where large OD is required.

Duplex hub · A790 S32205 · A790 S32750

What is A928?

Electric-fusion-welded duplex/super duplex pipe with defined classes for weld quality and heat treatment. Always quote UNS grade + class + NDE together.

Typical applications

• Large seawater and firewater lines
• Offshore process headers
• Desalination and brine transfer piping

Selection guidance

Pick S32205 for standard duplex upgrades; S32750/S32760 for higher PREN. Align filler metal and WPS with the chosen UNS grade.

ASTM A928 Duplex Stainless Steel EFW Pipes

CHEMICAL AND Mechanical Properties OF ASTM A928 Duplex Stainless Steel EFW Pipes

Corrosion Resistance of Duplex stainless steel

Duplex stainless steel are extremely corrosion resistant. They have high resistance to intergranular corrosion. Even in chloride and sulphide environments, Duplex stainless steel exhibit very high resistance to stress corrosion cracking.

The super duplex grades are even more resistant to corrosion.

Heat Resistance of Duplex stainless steel

The high chromium content of Duplex stainless steel that p rotects against corrosion, causes embrittlement at temperatures over about 300°C.

At low temperatures duplex stainless steels have better ductility than the ferritic and martensitic grades. Duplex grades can readily be used down to at least -50°C.

Fabrication of Duplex stainless steel

Fabrication of all stainless steel should be done only with tools dedicanted to stainless steel materials. Tooling and work surfaces must be thoroughly cleaned before use. These precautions are necessary to avoid cross contamination of stainless steel by easily corroded metals that may discolour the surface of the fabricanted product.

Heat Treatment of Duplex stainless steel

Duplex stainless steel cannot be hardened by heat treatment. They can however be work hardened.

Solution treatment or annealing can be done by rapid cooling after heating to around 1100°C.

Machinability

Although machinable, the high strengths of Duplex stainless steel makes machining difficult. As an example, machining of 2205 is around 20% slower than for 304.

Machining can be enhanced by using the following rules:

• Cutting edges must be kept sharp. Dull edges cause excess work hardening.
• Cuts should be light but deep enough to prevent work hardening by riding on the surface of the material.
• Chip breakers should be employed to assist in ensuring swarf remains clear of the work
• Low thermal conductivity of austenitic alloys results in heat concentrating at the cutting edges. This means coolants and lubricants are necessary and must be used in large quantities.

Welding of Duplex stainless steel

Duplex stainless steel have good weldability. All standard welding processes can be used. They are not quite as easily welded as the austenitic grades but low thermal expansion in duplex grades reduces distortion and residual stresses after welding. The recommended filler material for 2205 stainless steel is 2209.

ASTM A928 Duplex Stainless Steel EFW Pipes Apllicantion

The Duplex Stainless Steel EFW Pipes is used in the following Applications:-

• Chemical Processing, Transport and Storage
• Oil and Gas Exploration and Offshore Rigs
• Mil and Gas Refining
• Marine Environments
• Pollution Control Equipment
• Pulp & Paper Manufacturing
• Chemical Process Plant

Duplex Stainless Steel EFW Pipes Sizes Available in Stock

Frequently asked questions — ASTM A928 Duplex EFW Pipe

What is ASTM A928?

A928 covers ferritic/austenitic (duplex) stainless steel pipe made by electric fusion welding — the duplex counterpart to A358.

A928 vs A790?

A790 is seamless/welded duplex pipe (including smaller OD routes). A928 is the EFW large-OD duplex/super duplex product form.

Which UNS grades?

Commonly S31803, S32205 (2205), S32750 and S32760 — confirm chemistry and class on the PO.

Any fabrication cautions?

Yes — control heat input and interpass temperature to protect ferrite/austenite balance and avoid harmful intermetallics.

Supplying ASTM A928 Duplex Stainless Steel EFW Pipes to Countries -

We Export ASTM A928 Duplex Stainless Steel EFW Pipes to Saudi Arabia, Iran, Iraq, United Arab Emirates, Qatar, Bahrain, Oman, Kuwait, Turkey, Egypt, Yemen, Syria, Israel, Jordan, Cyprus, Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan, Sri Lanka, Maldives, Bangladesh, Myanmar, Taiwan, Cambodia, Argentina, Bolivia, Brazil, Chile, Venezuela, Colombia, Ecuador, Guyana, Paraguay, Uruguay, United States of America, Canada, Mexico, Panama, Costa Rica, Puerto Rico, Trinidad And Tobago, Jamaica, Bahamas, Denmark, Russia, Norway, Germany, France, Italy, United Kingdom, Spain, Ukraine, Netherlands, Belgium, Greece, Czech Republic, Portugal, Hungary, Albania, Austria, Switzerland, Slovakia, Finland, Ireland, Croatia, Slovenia, Malta, Nigeria, Algeria, Angola, South Africa, Libya, Egypt, Sudan, Equatorial Guinea, The Republic Of Congo, Gabon, Europe, Africa, Asia, North America, South America, Middle East, Far East.etc

Savoy Piping Inc. is a well known worldwide Exporter of ASTM A928 Duplex Stainless Steel EFW Pipes, Savoy Piping Inc. is committed to provide each and every customer with the highest standard of customer service. We deal in ASTM A928 Duplex Stainless Steel EFW Pipe in India and Overseas, offering a wide range of ASTM A928 Duplex Stainless Steel EFW Pipes