Precision engineered forged components manufactured in strict adherence to ASME, EN, DIN, and ISO standards with full material traceability.
In modern heavy industry, joint failure is not merely a maintenance hassle—it represents potential catastrophic environmental exposure, explosive decompression, or costly unscheduled plant shutdowns. High-performance Duplex Flanges (UNS S31803 / S32205 / 2205) and Super Duplex Flanges (UNS S32750 / 2507, UNS S32760) are specifically deployed where conventional austenitic stainless steels (304L/316L) fail due to pitting, crevice corrosion, or chloride-induced stress corrosion cracking (SCC).
Operated under extreme hydrostatic pressures and high H2S / CO2 concentrations. Duplex 2205 and Super Duplex 2507 weld neck and blind flanges guarantee high yield strength (≥450 MPa) and immunity to sour gas cracking per NACE MR0175 / ISO 15156 standards.
Reverse osmosis high-pressure manifolds endure concentrated brine solutions with high chloride contents. Duplex flanges provide a high Pitting Resistance Equivalent Number (PREN ≥ 35 for 2205, PREN ≥ 42 for 2507), eliminating localized pitting corrosion across 30+ years of operational life.
Handling aggressive media like nitric acid, organic acids, and wet chloride gases requires balanced dual-phase (ferrite-austenite ~50/50) microstructures. Our controlled forging and solution annealing deliver superior resistance to intergranular corrosion.
With rising global infrastructure expenditure in green hydrogen transport, offshore wind substations, and LNG regasification complexes, engineering specifiers are transitioning from traditional 316L stainless steel to Duplex alloys. Duplex stainless steel yields nearly double the design stress allowance of 300-series austenitic steels, enabling thinner wall pipe schedules (e.g., Sch 40S down to Sch 10S) and reducing overall flange and piping weight by up to 35-40%.
| Material Grade | UNS Standard | PREN Value | Yield Strength (0.2% Proof) | Pitting & SCC Resistance | Primary Industrial Applications |
|---|---|---|---|---|---|
| Duplex 2205 | UNS S31803 / S32205 | 35 – 38 | ≥ 450 MPa | Very High | Offshore Oil & Gas, Desalination, Chemical Tanks, Marine Piping |
| Super Duplex 2507 | UNS S32750 | 42 – 45 | ≥ 550 MPa | Exceptional | Subsea Manifolds, Sour Gas Wells, High-Pressure RO Systems |
| Super Duplex 2507 Cu | UNS S32760 (Zeron 100) | 42 – 47 | ≥ 550 MPa | Exceptional + Acid | Flue Gas Desulfurization (FGD), Sulfuric Acid Plants, Marine Hardware |
| Austenitic 316L | UNS S31603 | 23 – 25 | ≥ 220 MPa | Moderate | Standard Utility Lines, Low-Concentration Chemical Services |
| Carbon Steel A105 | UNS K03504 | N/A | ≥ 250 MPa | Requires Coating | High Pressure Steam, Refineries, Non-Corrosive Gas Pipelines |
Situated in the Zhuangli Enclave Industrial Zone of Dingxiang County, Shanxi—globally recognized as the "Hometown of Forging in China"—Shanxi Yuxin operates an integrated, single-site manufacturing facility. Unlike stockists or trading entities, every flange carrying the YUXIN trademark is forged, heat-treated, CNC machined, and tested under strict internal quality management.
Closed-die and ring-rolling technology optimizes continuous metal grain flow around flange hubs and seating faces, guaranteeing maximum fatigue strength and pressure containment under cyclic pressure spikes.
Duplex stainless steels demand exact thermal control (~1020°C - 1100°C followed by rapid water quenching) to maintain the optimal 50% Ferrite / 50% Austenite phase balance and prevent deleterious sigma (σ) phase precipitation.
Equipped with high-precision vertical lathe turning centers and 3D measuring equipment, maintaining flange face serration finish (125-250 µin AARH) for dependable spiral-wound gasket seating.
Navigating regional pipeline regulations requires robust documentation. YUXIN provides complete compliance packages validated by accredited third-party inspection authorities (TÜV, DNV, SGS, BV).
Certified for pressure equipment installation across European Union member states under AD 2000-Merkblatt W0 / TRD 100.
Full material certificates detailing heat chemical analysis, mechanical tension/yield testing, Charpy V-notch impact tests down to -46°C, and NDT reports.
Verified qualification of special material manufacturers for Super Duplex UNS S32750 / S32760 in North Sea offshore projects.
Certified compliance for sulfide stress cracking (SSC) and stress corrosion cracking (SCC) in hydrogen-sulfide-containing sour environments.
Deployments of YUXIN forged duplex and alloy flanges across challenging regional installations demonstrate zero-defect field reliability.
Supplied over 450 metric tons of ASME B16.47 Series A Duplex 2205 Weld Neck Flanges for SWRO expansion plants in Jubail and Jebel Ali, maintaining seamless seal integrity against high-pressure reverse osmosis pumps operating at 70+ bar.
Delivered custom NORSOK-qualified Super Duplex S32750 Ring Type Joint (RTJ) flanges for topside process modules. All parts passed 100% Ultrasonic (UT) and Liquid Penetrant (PT) examination with zero recorded inclusions.
Fabricated heavy-wall ASTM A105 carbon steel and A182 F51 duplex blind and slip-on flanges for ethylene cracker tie-in headers, featuring custom corrosion-resistant epoxy exterior coatings and precision bolt-hole pitch tolerances.
YUXIN integrates modern manufacturing technologies to push the envelope of physical strength, metallurgical purity, and environmental sustainability.
Integrating weld overlay cladding (Inconel 625 / Duplex on Carbon Steel A105) to deliver extreme corrosion resistance at a fraction of solid alloy raw material costs.
Automated phased-array ultrasonic testing (PAUT) and digital radiographic inspection algorithms detect subsurface micro-voids prior to final CNC turning.
Transitioning reheating furnaces to clean natural gas and electric induction heating systems, targeting a 30% reduction in carbon footprint by 2028.
Refining forging techniques for cryogenic applications down to -196°C, supporting liquid natural gas (LNG) and liquid hydrogen transportation infrastructure.
To ensure complete peace of mind for EPC contractors and stockists, Shanxi Yuxin maintains strict quality control protocols across raw billet arrival, forging, heat treatment, machining, and final dispatch.
Positive Material Identification (PMI) conducted via handheld XRF and optical emission spectrometers to verify Cr, Ni, Mo, N, and C contents for every heat batch.
In-house tensile testing, yield proof verification, Brinell/Rockwell hardness testing, and Charpy V-notch impact testing performed under ASNT-certified technicians.
100% inspection of flange thickness, bolt circle diameter (BCD), bore diameter, hub length, and facing serration geometry prior to rust preventive application.
Over three decades of manufacturing consistency has earned long-standing supply agreements with world-renowned industrial leaders.
Answers to key engineering, procurement, and quality verification questions compiled by our global technical export team.
Browse our full spectrum of specialized pipe flanges, tube sheets, and ring-type joint connections built for global export.
Connect directly with Shanxi Yuxin's export engineering team. Send your flange drawing, material specification, or bill of quantities for a rapid technical response within 24 hours.
Factory Address: Zhuangli Enclave Industrial Zone, Dingxiang County, Shanxi Province, China
Direct Tel: +86-350-6071768 / +86 150 3443 1989
Engineering Email: [email protected] / [email protected]
