Duplex Steel Pipe

Duplex Steel Pipe and Duplex Steel Seamless & Welded Pipe Suppliers and Manufacturer in UK.

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Duplex steel pipes are made from duplex stainless steel, which combines austenitic and ferritic microstructures. This unique combination gives the pipes excellent strength and resistance to corrosion, making them suitable for tough environments in chemical processing, oil and gas, and marine engineering. They are known for their durability, high tensile strength, and ability to resist pitting and crevice corrosion, making them a reliable choice for critical applications in harsh conditions.

Duplex Steel Pipe Chemical Composition

MATERIAL	COMPOSITION % (APPROX)
	Cr	Ni	Mo	N	Mn	W	Cu
2101 LDX	21.5	1.5	0.3	0.22	5	–	–
DX2202	23	2.5	0.3	0.2	1.5	–	–
RDN 903	20	1.8	0.2	0.11	4.2	–	–
2304	23	4.8	0.3	0.10	–	–	–
2205	22	5.7	3.1	0.17	–	–	–
2507	25	7	4	0.27	–	–	–
Zeron 100	25	7	3.2	0.25	–	0.7	0.7
Ferrinox 255/ Uranus 2507Cu	25	6.5	3.5	0.25	–	–	1.5

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Duplex Steel Pipe Mechanical Properties

Mechanical properties	Tensile,min,ksi[MPa]	Yield,min,ksi[MPa]	Elongation,%(min)	Hardness,HB(max)
S31803	90 [620]	65 [450]	25	290
S32205	95 [655]	65 [450]	25	290
S32750	116 [800]	80 [550]	15	300
S32760	109 [750]	80 [550]	25	300

Top Duplex Steel Pipe Manufacturing Company in UK

At PipingMart, we take pride in being the largest supplier and manufacturer in the UK, offering cutting-edge solutions for all your piping needs. With state-of-the-art production plants strategically located in the UK, we boast a vast inventory of over 25,000 tons of premium-quality materials readily available in stock.

Duplex Steel Pipe Grades

Duplex Steel Pipes 2205
Duplex Steel Pipes S32205
Duplex Steel Pipes S31803

We offer These Duplex Steel Pipe as per DIN, ISO, JIS or ANSI Standard.

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Advantages of Duplex Steel Pipe

High Strength and Durability: Duplex steel pipes combine ferritic and austenitic stainless steel’s beneficial properties. This dual-phase microstructure enhances the overall strength of the pipes, making them highly durable even under high-pressure conditions.
Corrosion Resistance: One of the standout features of duplex steel pipes is their excellent resistance to various forms of corrosion, including stress corrosion cracking, pitting, and crevice corrosion. This makes them particularly suitable for use in environments where exposure to corrosive substances is common, such as offshore and marine applications.
Hardness Improvement: Duplex stainless steels typically exhibit higher hardness than austenitic stainless steels. This characteristic contributes to their resistance to abrasion and erosion, making them suitable for applications involving abrasive fluids or environments.
Cost Efficiency: Despite their superior properties, duplex steel pipes can often offer cost savings over other corrosion-resistant alloys. This cost efficiency arises from their longer service life, reduced maintenance requirements, and sometimes lower initial material costs than superalloys or nickel-based alloys.
Heat of Formation: The heat of formation, or the enthalpy change during the formation of duplex steel, refers to the energy released or absorbed in the process. While this isn’t typically marketed as a primary advantage, the balanced composition of duplex steel contributes to stable thermal and mechanical properties, which can be advantageous in various operational conditions.

Types of Duplex Steel Pipes

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Duplex Steel Pipe Uses

Application Industry

Duplex Steel Pipes applications are as diverse as the industries they serve driven primarily by the aerospace, railway, construction and automotive industries with petrochemical, nuclear, medical, Oil & Gas, Chemical, Pharmaceutical, Food & Beverage, Nuclear, Thermal Power plants, Paper and Pulp, marine and mining, etc.

Oil & Gas Industry

Construction and Infrastructure

Petro Chemical Industry

Power Generation Industry

Oil and Gas Industry: Duplex steel pipes are extensively used in the oil and gas industry for both onshore and offshore applications. They can transport corrosive fluids such as oil, gas, and water under pressure.
Chemical Processing: Duplex steel pipes are used in chemical processing plants due to their resistance to various corrosive environments. They can handle acids, chlorides, and other harsh chemicals effectively.
Desalination Plants: Duplex stainless steel is used in desalination plants where seawater is processed into fresh water. The pipes resist corrosion from saltwater and brine solutions.
Pulp and Paper Industry: Duplex steel pipes are employed in the pulp and paper industry to convey corrosive liquids in the paper production process.
Marine Applications: They are used in marine environments for applications such as shipbuilding, offshore platforms, and seawater handling due to their resistance to saltwater corrosion.
Construction and Structural Applications: Duplex steel pipes are used for structural supports and in architectural designs where corrosion resistance and aesthetic appeal are required.
Energy and Power Generation: They find application in power plants, both conventional and nuclear, where they are used in piping systems for steam, water, and other fluids.
Food and Beverage Industry: Duplex stainless steel pipes are utilized in food processing plants where hygiene, resistance to corrosion, and durability are crucial factors.
Automotive and Transportation: In automotive applications, duplex steel pipes are used in exhaust systems and other parts where corrosion resistance and strength are required.

How to Choose the Right Duplex Steel Pipe

Identify the Application Requirements: Determine the specific application for which you need the duplex steel pipe. Consider factors such as temperature, pressure, corrosive environment, and mechanical stress.
Corrosion Resistance: Evaluate the corrosion resistance requirements based on the environment where the pipe will be used (e.g., seawater, chemical processing, oil and gas industry).
Mechanical Properties: Consider the mechanical properties needed, including tensile strength, yield strength, and impact resistance. Choose a grade that meets the required mechanical specifications for your application.
Size and Dimensions: Determine the size (diameter and thickness) and length of the pipe required for your project. Ensure that the chosen duplex steel pipe meets these dimensional requirements.
Standards and Specifications: Verify that the duplex steel pipe meets relevant industry standards and specifications (e.g., ASTM, ASME, EN).
Weldability: Check the weldability of the duplex steel grade you intend to use. Some grades may require specific welding procedures to maintain corrosion resistance and mechanical properties.

How Does Cold Working Affect Magnetic Properties Of Duplex Steel Pipe?

Cold working can increase the strength and hardness of duplex steel pipe but typically reduces its magnetic permeability. This occurs due to changes in the microstructure and alignment of magnetic domains caused by plastic deformation during cold working processes.

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FAQ (Frequently Asked Questions)

Are Duplex Steel Pipe Suitable For High-Temperature Applications?

Yes, duplex steel pipes can be suitable for high-temperature applications due to their excellent strength and corrosion resistance combination. They maintain good mechanical properties at elevated temperatures, making them a viable choice for various industrial uses with high temperature and corrosion challenges.

Do Duplex Steel Pipes Require Corrosion Protection Coatings?

Duplex steel pipes typically do not require corrosion protection coatings due to their inherent resistance to corrosion in a wide range of environments, including chloride-rich and acidic conditions. This resistance results from their balanced microstructure of austenite and ferrite phases, making them suitable for many applications without additional coatings.

Can Duplex Steel Pipe Be Used For Underground Applications?

Yes, Duplex steel pipes can be used for underground applications due to their corrosion resistance and durability. They offer excellent resistance to chloride stress corrosion cracking and are suitable for various environments, including underground conditions.