Super Duplex Steel Flanges

Our Super Duplex Steel Flanges deliver exceptional performance where standard steels fail. With a robust composition of 25% chromium, 7% nickel, and 4% molybdenum (per ASTM A182/A479), these flanges achieve tensile strengths of 750-895 MPa – nearly double common 316L stainless steel.

The secret? The balanced ferritic-austenitic microstructure provides 42+ PREN (Pitting Resistance Equivalent), proven to withstand chloride levels exceeding 100,000 ppm in ASTM G48 testing. For offshore or chemical applications, this means 10+ years service life where standard flanges crack within 2-3 years. Every batch includes third-party mill test reports validating corrosion resistance and mechanical properties.

In corrosion tests (per ASTM G48 Method C), they handle 6% ferric chloride at 50°C for 300+ hours without damage. That's why they're a top pick for offshore platforms, desalination plants, and chemical reactors. For wholesalers, this means you can supply clients with the most demanding conditions, knowing these flanges will outlast cheaper alternatives by 10+ years.
 

We offer two key finishes: pickled (ASTM A380) to boost corrosion resistance and 2B mill finish (Ra 0.4-0.8μm, ASTM B46.1) for general use. The pickling process removes forging scale and creates a 10-12μm passive layer, which cuts corrosion rates by 40% compared to untreated surfaces.

Our CNC machining ensures tight tolerances: flange face flatness stays within 0.02mm/100mm (ASME B16.5), and bolt holes line up with ±0.1mm accuracy. Every flange gets an ultrasonic test (ASTM E213) to check for internal flaws, and we add protective caps to keep the sealing surface scratch-free during shipping.

As a Chinese manufacturer with 10 years supplying EU offshore and energy sectors, we run 6 specialized forging lines and 8 CNC machining centers, with an annual capacity of 4,000 tons-one of the few factories globally that can consistently produce large-diameter super duplex flanges (up to 48 inches).

Our in-house lab uses X-ray fluorescence (XRF) to verify chemical composition, ensuring every batch hits the exact chromium and molybdenum levels needed for that super duplex strength. We keep 300-500 tons in stock at our Qingdao warehouse, with real-time inventory updates online, and FOB Qingdao shipments for in-stock flanges leave within 5 days.

Orders over 50 tons get a 7% discount, plus free pickling and 24% off sea freight.

Here's our guarantee: If any Super Duplex Steel Flanges fail to meet ASTM A182 mechanical standards or shows pitting corrosion within 10 years, we'll replace it within 7 days and cover all shipping costs. We also lock prices for 60 days on bulk orders, so market swings won't eat into your margins.

1. What are Super Duplex Steel Flanges?
Super Duplex Steel Flanges are pipe connection components made from super duplex stainless steel, offering a combination of high mechanical strength and excellent resistance to corrosion, pitting and chloride-containing environments.

2. What grades are commonly used for Super Duplex Steel Flanges?
Common grades include UNS S32750 (2507) and UNS S32760, depending on the required standard, mechanical properties and application.

3. What standards are available for Super Duplex Steel Flanges?
Super Duplex Steel Flanges can be manufactured according to standards such as ASTM A182 for forged stainless steel flanges, with dimensions commonly specified according to ASME B16.5 or other applicable flange standards.

4. What types of Super Duplex Steel Flanges are available?
Common types include Weld Neck Flanges, Slip-On Flanges, Blind Flanges, Socket Weld Flanges, Threaded Flanges, Lap Joint Flanges, Orifice Flanges and RTJ Flanges.

5. Where are Super Duplex Steel Flanges used?
They are commonly used in oil and gas, petrochemical, chemical processing, marine, offshore, desalination and water-treatment systems, particularly where high strength and corrosion resistance are required.

6. What information is needed to order Super Duplex Steel Flanges?
Customers should provide the material grade, flange type, nominal pipe size (NPS), pressure class or PN rating, facing type, applicable standard, quantity and any special testing or certification requirements.

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