Duplex Steel Pipes

Duplex steel, also known as duplex stainless steel, is a type of steel with a two-phase microstructure made up of austenitic and ferritic stainless steel grains. This combination of microstructures provides increased strength and corrosion resistance, making duplex steel highly desirable for a wide range of applications.

 

Duplex steel pipes and tubes are a popular type of duplex steel product that is used in a variety of industrial applications. They're widely used in the chemical, oil and gas, and petrochemical industries, where they're subjected to harsh environments and corrosive substances like acids and chlorides. Duplex steel pipes and tubes provide long-lasting, durable solutions that can withstand these conditions while maintaining good mechanical and physical properties.

 

 

 

 

1. Size: The pipes and tubes are available in a range of sizes from ½" to 48" in diameter and up to 40 feet in length.

2. Wall thickness: The wall thickness of the pipes and tubes can range from 0.5mm to 60mm, depending on the specific application and operating conditions.

3. Material grade: The most common grades of duplex steel used in the manufacturing of pipes and tubes are UNS S31803, UNS S32205, UNS S32750, and UNS S32760.

4. Standards: The pipes and tubes can be manufactured to a range of international standards, including ASTM, EN, and ASME.

5. End finish: The pipes and tubes can be supplied with a range of end finishes, including plain end, beveled end, and threaded end.

6. Surface finish: The pipes and tubes can be supplied in a range of surface finishes, including 2B, BA, No. 4, and No. 8.

7. Testing and certification: The pipes and tubes are subject to a range of quality control tests to ensure their mechanical properties, corrosion resistance, and overall quality. These tests include hydrostatic testing, ultrasonic testing, and material testing. Upon request, the pipes and tubes can be supplied with third-party inspection and certification.

 

Duplex stainless steel has found widespread use in industries that require high strength and corrosion resistance. Its diverse applications make it a valuable material for various industries:

Oil and Gas Industry

Chemical Industry

Marine Industry

Construction Industry

Food and Beverage Industry

 

 

1. Corrosion Resistance: Duplex steel pipes and tubes have excellent corrosion resistance, especially in harsh and corrosive environments. Their two-phase structure provides superior resistance to stress corrosion cracking, pitting, crevice corrosion, and general corrosion.

2. Strength: Duplex steel is much stronger than conventional austenitic and ferritic stainless steels. This allows for thinner walls and smaller sizes, which can save costs in terms of material and labor.

3. Resistance to High Temperature and Pressure: Duplex steel pipes and tubes have a high resistance to both high temperature and pressure, making them suitable for use in high-pressure applications such as heat exchangers, boilers, and pressure vessels.

4. Low Thermal Expansion: The thermal expansion coefficient of duplex steel is much lower than other metals such as carbon steel and austenitic stainless steel. This makes duplex steel pipes and tubes more stable and less likely to experience thermal expansion-related issues.

 

The main differences between duplex steel and super duplex steel lie in their composition and properties. Super duplex steel is essentially a higher alloyed version of duplex steel that contains more chromium, molybdenum, and nickel. This results in improved corrosion resistance, higher strength, and greater resistance to stress corrosion cracking.

 

Size: ½" to 48" in diameter and up to 40 feet in length.

Length:5 to 7 meters or specific lengths as per customer requirements.

End Connections: threaded, beveled, plain, flanged, or grooved.

Surface Finish: black, galvanized, painted, or coated with epoxy, polyethylene, or polyurethane. The surface finish is based on the need for corrosion resistance, aesthetics, and durability.

 

In conclusion, SSM's expertise in manufacturing and supplying Duplex Steel Pipes in China makes them a reliable partner for various industries that require high-quality pipes. With their commitment to providing exceptional products and services, SSM ensures customer satisfaction and builds long-term relationships with their clients. Whether for offshore oil and gas, chemical processing, or other applications, SSM's Duplex Steel Pipes are a top-notch solution for any piping needs.

 

Q: What is the difference between 316 and duplex?

A: Duplex has a higher strength and better corrosion resistance than 316 stainless steel, making it suitable for use in harsh environments such as offshore oil rigs and chemical processing plants.

 

Q: Is 316L a duplex steel?

A: 316L is a variant of 316 stainless steel with a lower carbon content, which makes it more resistant to sensitization and subsequent corrosion. However, 316L is not a duplex steel.

 

Q: What are the different types of duplex steels?

A: Lean duplex stainless steels, Standard duplex stainless steels, and Super duplex stainless steels.

 

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