Duplex steel reducers are used for smooth diameter transition between pipes of different calibers, regulating medium flow velocity, flow rate, and pipeline pressure, reducing turbulent impact of highly corrosive fluids and local sediment accumulation. Products are divided into concentric reducers and eccentric reducers: the concentric type is suitable for vertical pipes and vertical equipment interfaces, with the medium conveyed centrally; the eccentric type is suitable for horizontal liquid-phase pipelines, with one side generatrix flush, which can reduce gas accumulation, liquid accumulation, and chloride ion deposition. Diameter coverage is DN15~DN1200, mainstream materials are 2205 (S32205/F51) duplex steel and 2507 (S32750/F53) super duplex steel, can be produced according to ASME B16.9, ASTM A815, GB/T12459, EN, DIN, GOST, JIS and other standards, and supports non-standard customization. Forming processes include seamless cold pushing, CNC roll welding, and precision forging, factory delivery undergoes pickling and passivation, and internal and external mirror polishing can be done on demand.
- The duplex metallographic structure contains both austenite and ferrite, with yield strength approximately 2 times that of 304/316L austenitic stainless steel, balancing toughness and hardness, with outstanding resistance to high-pressure deformation and fatigue.
- Strong resistance to chloride ion pitting corrosion, crevice corrosion, intergranular corrosion, and stress corrosion cracking, suitable for seawater, brine, salt spray, sulfide, and acid-base medium working conditions, making up for the corrosion shortcomings of carbon steel and ordinary stainless steel pipe fittings.
- Two structural options are available: concentric and eccentric: concentric type for vertical pipes and vertical equipment interfaces, eccentric type for horizontal seawater, brine, acid-base liquid-phase pipelines, reducing gas accumulation, liquid accumulation, and local pitting corrosion risk.
- Diameter coverage is DN15~DN1200, supports two materials 2205 and 2507, can be produced according to multiple national standards, and undertakes customization requirements such as non-standard diameter reduction drop, extended straight pipe sections, and special eccentricity.
- Factory delivery undergoes pickling and passivation, and internal and external mirror polishing can be done on demand; integrated forming with uniform wall thickness and smooth transition helps reduce fluid resistance and corrosion dead corners.
| Product Name | Duplex Steel Reducer |
| Categories | Reducers |
| Customization | The factory possesses full-dimensional high-end duplex steel reducer precision customization capabilities, is proficient in seawater, acid-base, sulfide, high-pressure alternating extreme working condition standards, and undertakes various ultra-high-difficulty special non-standard customization orders worldwide. Dimensional customization can produce arbitrary non-standard diameter reduction drop, extended anti-corrosion straight pipe sections, special eccentricity, and special-shaped transition structures, suitable for overseas old marine non-standard pipe networks and imported high-end anti-corrosion equipment special interface modification projects. Wall thickness can be customized for ultra-thick high-pressure, locally reinforced pressure-resistant and wear-resistant structures, suitable for high-pressure and strong corrosion dual extreme load working conditions. Materials can be customized on demand for 2205 ordinary duplex steel and 2507 super duplex steel full series of high-end grades, matching different levels of chloride ion and acid-base corrosion working conditions. Processes support internal and external mirror polishing, sterile fine cleaning, special pickling and passivation |
| MOQ | Duplex steel reducers adopt a high-end special pipe fitting flexible tiered MOQ mechanism, suitable for overseas high-end sample testing, special engineering supplementary orders, high-end warehouse stocking, and EPC international high-end centralized procurement diversified purchasing scenarios. DN15–DN600 conventional 2205 duplex steel, SCH standard wall thickness, concentric and eccentric mainstream in-stock specifications, minimum order quantity 10 pieces, supporting overseas high-end projects |
| Lead Time | Relying on a dedicated precision production line for duplex steel, a complete set of pickling and passivation equipment, and a standing inventory system of high-end special raw materials, duplex steel reducers provide high-end precision-controllable stepped delivery services, precisely matching the stringent schedule milestones of high-end anti-corrosion projects in global marine and chemical industries. DN15–DN600 conventional 2205 duplex steel standard wall thickness seamless reducers, kept in standing stock inventory, standard orders |
| Packaging | Duplex steel reducers use high-end precision anti-corrosion and dust-proof packaging dedicated to foreign trade, strictly preventing high-end pipe fittings from transportation scratches, oxidation, stains, collision deformation, and bevel damage, ensuring export high-end appearance and cleanliness. Small DN15–DN100 precision duplex steel reducers have special plastic protective rings and dust caps installed at the pipe ends, each individually wrapped in anti-rust paper, sealed and packed separately in waterproof PE film, avoiding friction scratches and air oxidation, and maintaining the integrity of the surface passivation layer. Medium DN125–DN600 specifications are neatly stacked on fumigation-free solid wood pallets, with layered isolation protection, overall wrapped in waterproof and dust-proof film, and secured with steel straps to prevent slipping, eliminating displacement and wear from container stacking. Large DN600 and above large-diameter super duplex steel reducers use custom thickened solid wood dense |
| Reference Price | Inquiry |
| Product Type | Concentric reducers, eccentric reducers |
Applications
- Reducer connections for offshore oil production platform pipe networks, ship anti-corrosion pipelines, coastal power plant salt spray pipelines, and cross-sea engineering seawater transportation systems.
- Eccentric reduction for horizontal liquid-phase pipelines in seawater desalination plants, seawater heat exchange systems, and brine circulation pipe networks, reducing gas and liquid accumulation and chloride ion deposition.
- Concentric or eccentric reduction for oilfield brine transportation, refining desulfurization and denitrification pipe networks, acidic oil and gas process pipelines, and high-pressure corrosive systems containing sulfur media.
- Reducer transitions for highly corrosive process pipelines in fine chemicals such as acid-base chemicals, pesticides and pharmaceuticals, and dye chemicals.
- Reducer connections for salt lake development, brine extraction, high-salinity wastewater treatment, and saline waste gas treatment pipeline systems.
- Batch reducer fittings used by overseas high-end chemical equipment manufacturing plants and seawater treatment complete equipment suppliers for import and export of equipment under severe corrosion conditions.
Purchasing & Delivery
Duplex steel reducers are scheduled for production according to orders. DN15~DN600 conventional 2205 duplex steel standard wall thickness seamless reducers are kept in regular stock, and standard orders can be shipped quickly; non-standard custom orders and 2507 super duplex steel orders are arranged for production according to specifications and quantities. Please contact us to confirm the specific delivery time. The minimum order quantity for conventional mainstream specifications is 10 pieces, and the tiered MOQ mechanism can adapt to different procurement scenarios such as overseas high-end sample testing, special engineering replenishment orders, high-end warehouse stocking, and EPC international centralized procurement. Packaging is protected by grade according to specifications: small pipe fittings are equipped with plastic protective rings and dust caps at the pipe ends, wrapped in single-piece anti-rust paper and sealed with waterproof PE film; medium-sized specifications use fumigation-free solid wood pallets with layered isolation, wrapped with waterproof and dustproof film, and secured with steel straps; large diameters above DN600 use custom thickened solid wood sealed wooden boxes, with internal soft foam positioning for shock absorption and reinforced corner protectors. All products are affixed with bilingual Chinese-English labels indicating material grade, UNS number, wall thickness, standard, heat number, and batch number, meeting the warehousing acceptance and clean storage requirements of overseas projects.
Service & Support
Before sales, anti-corrosion high-pressure engineers assist in matching 2205 or 2507 materials according to working condition parameters such as seawater chloride ion concentration, acid-base PH value, sulfide content, working pressure and temperature, and distinguish between concentric and eccentric installation structures to reduce the risk of selection deviation. During sales, forming, welding, passivation, flaw detection, and spectral re-inspection data are synchronized, supporting customers' remote factory audits, online piece-by-piece inspection, and third-party supervision, with the entire order traceable. After sales, an 18-month cross-border warranty is provided. During the warranty period, material defects, corrosion resistance failure, process defects, leakage and deformation caused by non-human installation problems will be remanufactured and reshipped free of charge, and cross-border logistics and production costs will be borne by us. At the same time, lifelong technical support for special anti-corrosion pipelines is provided, with 24-hour bilingual Chinese-English answers to questions on installation and welding, anti-corrosion maintenance, and overseas acceptance standards.
FAQ
What is the difference between duplex steel reducers and ordinary stainless steel reducers?
The metallographic structure of duplex steel reducers contains both austenite and ferrite. Its yield strength is about twice that of 304/316L austenitic stainless steel, and its resistance to chloride ion pitting corrosion, stress corrosion cracking, and sulfide corrosion is also significantly stronger. Ordinary 304 and 316L stainless steel are prone to frequent corrosion failure under working conditions such as seawater, brine, and strong acids and bases. Duplex steel reducers are precisely reducer fittings designed for such severe corrosive pipeline systems.
How to choose between 2205 and 2507 materials?
For conventional seawater and medium acid-base corrosion conditions, 2205 duplex steel can be selected, with relatively high cost performance; for extreme corrosion conditions such as high-concentration chloride ions, high temperature and high pressure, and strong sulfides, 2507 super duplex steel is recommended. The specific selection needs to be comprehensively judged in combination with parameters such as medium composition, concentration, temperature, and pressure. You are welcome to contact us to provide the working conditions, and we will assist in confirming the suitable material.
Where are concentric reducers and eccentric reducers used respectively?
Concentric reducers are mainly used for vertical pipelines and vertical chemical equipment interfaces, where the medium is conveyed stably in the center without bias flow or dead corners; eccentric reducers are specially used for horizontal seawater, brine, acid-base liquid-phase pipelines, with one side of the generatrix flush, which can reduce gas accumulation, liquid accumulation, and sediment retention in horizontal pipelines, and prevent local pitting corrosion caused by chloride ion accumulation.
Can you provide NACE anti-corrosion certification and 3.1B qualification?
We can provide a full set of English qualifications, spectroscopy, flaw detection, metallography, pitting corrosion testing, and NACE compliance reports free of charge, suitable for international high-end bidding and acceptance. For the specific types and number of copies of reports required, please contact us to confirm before placing an order so that they can be prepared with the shipment.
Can non-standard sizes and special materials be customized?
Yes. We support size customization for non-standard reducer drop, extended anti-corrosion straight pipe sections, special eccentricity, special-shaped transition structures, ultra-thick high-pressure wall thickness, local reinforced pressure-resistant and wear-resistant structures, etc. Materials can be selected from the full series of 2205 or 2507 grades. Processes support internal and external mirror polishing, sterile fine cleaning, special pickling and passivation, stress-free finishing treatment, and can also be reproduced 1:1 according to overseas drawings or old parts. The sampling cycle is 3~5 days. You are welcome to provide drawings or sample photos so that we can assist with quoting.
How does export packaging ensure the appearance of pipe fittings?
Small DN15~DN100 pipe openings are equipped with plastic protective rings and dust caps, each piece is wrapped in anti-rust paper and sealed and packed separately with waterproof PE film; medium DN125~DN600 sizes are neatly stacked on fumigation-free solid wood pallets, with layered isolation protection, overall wrapped with waterproof and dustproof film, and secured with steel straps to prevent slipping; large diameters above DN600 are individually packaged in custom thickened sealed solid wood boxes, with internal soft foam positioning for shock absorption and reinforced corner protectors. All products are affixed with Chinese-English bilingual labels indicating material grade, UNS number, wall thickness, standard, heat number, and batch number.
