Duplex Steel Flanges

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Duplex Steel Flanges Manufacturer and Supplier in Midland, UK.

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Duplex steel flanges are essential fittings in piping systems, favoured for their exceptional corrosion resistance, strength, and durability blend. This type of stainless steel features a unique two-phase microstructure comprising both austenitic and ferritic phases, offering superior properties to conventional stainless steel.

Duplex Steel Flanges Specifications

Specifications	ASTM A182 / ASME SA182
Size	1/8″ NB TO 48″ NB
Standards	ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc.
Class / Pressure	150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc.
Standard	ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc.
Grades	S31803 / S32205 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61

Duplex Steel Flanges Chemical Composition

Grade	S31803
C	0.030 max
Mn	2.00 max
Si	1.00 max
P	0.030 max
S	0.020 max
Cr	22.0 – 23.0
Mo	3.0 – 3.5
Ni	4.50 – 6.50
N	0.14 – 0.20
Fe	63.72 min

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Duplex Steel Flanges Mechanical Properties

Grade	S31803
Density (g/cm 3)	7.805
Density (lb/in 3)	0.285
Melting Point (°C)	1420 – 1465
Melting Point (°F)	2588 – 2669

Top Duplex Steel Flanges 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 Flanges Steel Flanges

Duplex Steel Flanges 2205
Duplex Steel Flanges S32205
Duplex Steel Flanges S31803

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

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Advantages of Duplex Steel Flanges

Corrosion Resistance: Duplex steel flanges are highly corrosion-resistant, especially in environments rich in chlorides and sulfides. This makes them ideal for applications where regular stainless steel may corrode over time. Their resistance is comparable to austenitic stainless steel, ensuring long-term reliability and durability.
High Strength: These flanges boast superior strength to standard austenitic stainless steel. This strength allows for thinner material thicknesses while maintaining structural integrity, reducing overall weight in structural applications without compromising performance.
Excellent Toughness: Duplex steels combine high strength with excellent toughness, making them resilient against impacts and resistant to brittleness. This toughness ensures reliable performance in harsh operating conditions, minimizing the risk of mechanical failures and enhancing operational safety.
Stress Corrosion Cracking Resistance: One of their standout features is their resistance to stress corrosion cracking (SCC), which occurs under tensile stress in corrosive environments. This resistance is crucial in industries where SCC can lead to catastrophic failures, such as offshore oil rigs and chemical processing plants.
Cost-Effectiveness: Despite their advanced properties, duplex steel flanges often offer cost savings compared to alternatives like super austenitic or nickel-based alloys. This makes them a practical choice for budget-conscious projects without compromising performance or longevity.
Good Weldability: Duplex steels are known for their good weldability, facilitating easier fabrication and assembly processes. This characteristic ensures that these flanges can be efficiently integrated into complex systems while maintaining their mechanical properties and corrosion resistance post-welding.

Types of Duplex Steel Flanges

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Duplex Steel Flanges Uses

Application Industry

Duplex Steel Flanges find widespread industrial applications across various sectors due to their exceptional combination of corrosion resistance, strength, and durability. Commonly utilized in industries such as oil and gas, chemical processing, marine, and offshore, these flanges play a crucial role in piping systems subjected to corrosive environments, high pressures, and extreme temperatures.

Oil & Gas Industry

Water Treatment

Chemical Processing

Pulp and Paper Industry

Oil and Gas Industry: Duplex steel flanges are widely used in offshore and onshore oil and gas facilities due to their excellent resistance to corrosion in aggressive environments containing hydrogen sulfide (H2S) and chloride ions. They are employed in pipelines, refineries, and petrochemical plants.
Chemical Processing: Flanges made from duplex steel are suitable for handling various chemicals and solvents. They offer superior resistance to stress corrosion cracking, making them ideal for chemical processing equipment and pipelines.
Marine Applications: Due to their high strength and corrosion resistance, duplex steel flanges are used in marine environments, including shipbuilding, offshore platforms, and coastal structures subject to saltwater exposure.
Water Treatment: In water treatment plants, where freshwater and seawater environments are encountered, duplex steel flanges are preferred to resist pitting and crevice corrosion, ensuring long-term reliability.
Power Generation: Flanges made from duplex steel are used in power plants, including nuclear, thermal, and renewable energy facilities. They withstand high temperatures and pressures, providing structural integrity and reliability in critical applications.
Construction: Duplex steel flanges are also employed in construction projects, such as bridges and buildings, where corrosion resistance and high strength are essential for structural integrity and longevity.

How to Choose the Right Duplex Steel Flanges

Corrosion Resistance: Duplex steel is chosen primarily for its excellent corrosion resistance. Ensure the flanges are suitable for the specific environment they will be exposed to, such as seawater, acidic or alkaline solutions, or high chloride environments.
Pressure and Temperature Ratings: Check the flange ratings (ANSI/ASME or EN standards) to ensure they can handle your application’s pressure and temperature conditions. Duplex steel typically offers good strength and performance under varying pressures and temperatures.
Size and Dimensions: Flanges come in various sizes and dimensions (e.g., ANSI B16.5, B16.47 Series A/B, EN 1092-1). Ensure the flanges you choose match the pipe size, pressure class, and face type (RF, RTJ, etc.) required for your piping system.
Application Specific Requirements: Consider special requirements such as high mechanical strength, resistance to stress corrosion cracking, or fatigue resistance. Duplex steel is known for its combination of these properties, but specific grades may offer variations in performance.
Standards and Certifications: Ensure the flanges meet relevant industry standards (e.g., ASTM, ASME, EN) and have necessary certifications (e.g., PED, CE marking) for your project’s compliance requirements.
Cost-effectiveness: While duplex steel offers excellent performance, consider the overall cost-effectiveness of the flanges, including initial purchase cost, maintenance requirements, and longevity.

How Do I Maintain Duplex Steel Flanges?

To maintain Duplex Steel Flanges, regularly inspect for signs of corrosion or wear. Clean with mild soap and water, avoiding abrasive cleaners. Apply a corrosion-resistant coating if needed and ensure proper installation torque to prevent leaks and maintain integrity over time.

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FAQ (Frequently Asked Questions)

Can Duplex Steel Flanges be welded?

Yes, Duplex Steel Flanges can be welded using suitable welding techniques such as TIG (Tungsten Inert Gas) or MIG (Metal Inert Gas). It’s important to use matching filler materials to ensure the weld joint retains the duplex stainless steel’s properties, including its corrosion resistance and mechanical strength. Proper welding procedures are crucial to avoid intermetallic phases and maintain the flange’s integrity in demanding environments.

Are Duplex Steel Flanges suitable for hygienic and sanitary applications?

Yes, Duplex Steel Flanges are suitable for hygienic and sanitary applications due to their excellent corrosion resistance, which includes resistance to pitting and crevice corrosion. They are also known for their high strength and toughness, making them ideal for environments requiring stringent cleanliness and reliability, such as food processing, pharmaceuticals, and chemical industries.

Are Duplex Steel Flanges susceptible to galvanic corrosion?

Duplex Steel Flanges are generally resistant to galvanic corrosion due to their balanced composition of austenitic and ferritic phases. This composition minimizes the potential for galvanic coupling with other metals, reducing the risk of corrosion in mixed-metal environments. Proper material selection and maintenance further enhance their resistance, making them suitable for diverse industrial applications where corrosion resistance is critical.

Duplex Steel Flanges Size Chart

Nominal Size	Outside Diameter (OD)	Min. Thickness (T)	RF Dia. (R)	No. of Bolt Holes	Diameter of Holes	Bolt Circle (BC)	SO Bore ID (SB)	WN Bore ID (WB)	Dia. Hub Base (HB)	Dia. of Hub Top (HT)	SO LTH (SL)	WN LTH (WL)
1⁄2	3.50	0.38	1.38	4	0.62	2.38	0.88	0.62	1.19	0.84	0.56	1.81
3⁄4	3.88	0.44	1.69	4	0.62	2.75	1.09	0.82	1.50	1.05	0.56	2.00
1	4.25	0.50	2.00	4	0.62	3.12	1.36	1.05	1.94	1.32	0.62	2.12
11⁄4	4.62	0.56	2.50	4	0.62	3.50	1.70	1.38	2.31	1.66	0.75	2.19
11⁄2	5.00	0.62	2.88	4	0.62	3.88	1.95	1.61	2.56	1.90	0.81	2.38
2	6.00	0.69	3.62	4	0.75	4.75	2.44	2.07	3.06	2.38	0.94	2.44
21⁄2	7.00	0.81	4.12	4	0.75	5.50	2.94	2.47	3.56	2.88	1.06	2.69
3	7.50	0.88	5.00	4	0.75	6.00	3.57	3.07	4.25	3.50	1.12	2.69
31⁄2	8.50	0.88	5.50	8	0.75	7.00	4.07	3.55	4.81	4.00	1.19	2.75
4	9.00	0.88	6.19	8	0.75	7.50	4.57	4.03	5.31	4.50	1.25	2.94
5	10.00	0.88	7.31	8	0.88	8.50	5.66	5.05	6.44	5.56	1.38	3.44
6	11.00	0.94	8.50	8	0.88	9.50	6.72	6.07	7.56	6.63	1.50	3.44
8	13.50	1.06	10.62	8	0.88	11.75	8.72	7.98	9.69	8.63	1.69	3.94
10	16.00	1.12	12.75	12	1.00	14.25	10.88	10.02	12.00	10.75	1.88	3.94
12	19.00	1.19	15.00	12	1.00	17.00	12.88	12.00	14.38	12.75	2.12	4.44
14	21.00	1.31	16.25	12	1.12	18.75	14.14	13.25	15.75	14.00	2.19	4.94
16	23.50	1.38	18.50	16	1.12	21.25	16.16	15.25	18.00	16.00	2.44	4.94
18	25.00	1.50	21.00	16	1.25	22.75	18.18	17.25	19.88	18.00	2.62	5.44
20	27.50	1.62	23.00	20	1.25	25.00	20.20	19.25	22.00	20.00	2.81	5.62
22	29.50	1.75	25.25	20	1.38	27.25	22.22	21.25	24.25	22.00	3.07	5.82
24	32.00	1.81	27.25	20	1.38	29.50	24.25	23.25	26.12	24.00	3.19	5.94