Explore our ISO 9001 and PED-certified pressure class flanges engineered for oil & gas, chemical processing, thermal power generation, and heavy manufacturing.
Delivering uncompromised structural integrity, full mechanical traceability, and verified pressure performance across demanding global fluid conveyance projects.
Shanxi Yuxin Casting & Forging Co., Ltd., founded in 1992 in the renowned "Hometown of Forging in China" (Dingxiang County, Shanxi), operates as a fully integrated, modern forging facility. Spanning over three decades of engineering refinement, our manufacturing complex avoids intermediary trading desks, maintaining total quality control from raw steel billet selection through electric induction heating, closed-die and ring-rolling forging, computerized heat treatment, precision CNC machining, and non-destructive testing (NDT).
Our annual output exceeds 10,000 metric tons of forged flanges and 2,000 metric tons of custom engineered forged components. With direct oversight of heat chemistry, grain refinement, and mechanical tempering, Yuxin ensures that every pressure class product strictly matches the mechanical properties specified in EN 10204 3.1 and 3.2 inspection certificates.
Operating under rigorous global quality frameworks, Shanxi Yuxin holds formal accreditations including ISO 9001:2015 assessed by TÜV CERT, Pressure Equipment Directive (PED 2014/68/EU) Annex I Section 4.3, AD 2000-Merkblatt W0 / TRD 100, and VdTÜV Werkstoffblatt 350 / 399-3 approvals. In addition, our manufacturing facilities hold national Special Equipment Manufacturing Licenses (TS Certification) and have been awarded High-Tech Enterprise status as well as Shanxi "Specialized & New" SME recognition.
Our technical sales and engineering departments provide end-to-end documentation packages, including positive material identification (PMI), ultrasonic testing (UT), magnetic particle inspection (MT), liquid penetrant testing (PT), and Charpy V-notch impact test reports down to -46°C for low-temperature service environments.
Pressure classes define the allowable non-shock working pressures of piping components across specific operating temperatures. Choosing the optimal pressure class rating is critical to balancing system safety, structural weight, and capital expenditure.
Under the American Society of Mechanical Engineers (ASME) standards, pressure-temperature ratings are designated by numerical pressure classes ranging from Class 150 to Class 2500. ASME B16.5 covers nominal pipe sizes from NPS 1/2 through NPS 24, while ASME B16.47 Series A (MSS SP-44) and Series B (API 605) extend specifications for large-diameter flanges from NPS 26 through NPS 60.
Key Standard Distinctions: Class ratings do not equal working pressure in PSI; rather, they serve as rating designations. For example, an ASTM A105 carbon steel Class 300 flange has a maximum working pressure of approximately 740 psig at -29°C to 38°C, but its allowable pressure decreases non-linearly as temperature climbs toward 425°C due to thermal softening and creep dynamics.
| Standard Framework | Designated Pressure Classes / Ratings | Nominal Size Range | Facing Types Available | Primary Industrial Applications |
|---|---|---|---|---|
| ASME B16.5 | Class 150, 300, 400, 600, 900, 1500, 2500 | 1/2" to 24" (DN15 - DN600) | RF, FF, RTJ (Ring Type Joint), T&G, M&F | Refining, Petrochemical, Offshore Oil & Gas, High-Pressure Gas Lines |
| ASME B16.47 Series A | Class 150, 300, 400, 600, 900 | 26" to 60" (DN650 - DN1500) | Raised Face (RF), Ring Type Joint (RTJ) | Cross-Country Pipelines, Heavy Industrial Plant Headers, Vessel Nozzles |
| ASME B16.47 Series B | Class 75, 150, 300, 400, 600, 900 | 26" to 60" (DN650 - DN1500) | Raised Face (RF), Flat Face (FF) | Compact Offshore Piping, Subsea Manifolds, Space-Constrained Rigs |
| EN 1092-1 / DIN | PN6, PN10, PN16, PN25, PN40, PN63, PN100, PN160, PN250, PN400 | DN10 to DN3000 | Type A (Flat), Type B1/B2 (RF), Type C/D (Tongue/Groove), Type E/F | European Chemical Plants, Municipal Waterworks, Power Plant Steam Loops |
| JIS B2220 / GOST | 5K, 10K, 16K, 20K, 30K / Py 6 to Py 400 bar | DN10 to DN2000 | Flat Face, Raised Face, Male-Female | Shipbuilding, Marine Propulsion, East European Regional Gas Grid Infrastructure |
When selecting pressure class products, material choice determines thermal stability, corrosion resistance, and fracture toughness. Shanxi Yuxin stocks certified forging-grade billets across diverse steel families:
Flange facing geometry dictates joint sealing integrity under fluctuating mechanical stresses and thermal cycling:
Modern B2B procurement leaders, EPC contract engineers, and industrial stockists evaluate flange suppliers far beyond initial piece-rate pricing. Supply chain resilience, compliance verification, and precision tolerances drive purchasing decisions.
Distributors require high-volume manufacturing consistency, standardized pallet packaging, anti-corrosion black painting or yellow varnish coatings, and clear heat-number hard-stamping to allow effortless integration into regional stockholding warehouses.
For urgent repair shutdowns (MRO) and tight project schedules, procurement managers rely on suppliers who hold semi-finished forged blanks ready for custom CNC boring, facing, and bolt-hole drilling within compressed 7 to 15-day turnarounds.
Eliminating material risk is paramount. Global EPCs mandate full chemical melt analysis, grain size assessment, ultrasonic testing reports, and third-party witness inspection stamps (SGS, TÜV, Lloyd's Register, Bureau Veritas) prior to shipment clearance.
Purchasing sub-standard flanges often leads to catastrophic field leaks, unexpected refinery downtime, or expensive weld failures during field hydrostatic testing. By partnering directly with a primary forging manufacturer like Shanxi Yuxin, engineering buyers achieve direct cost efficiency while securing 100% material heat-code traceability. Our in-house die design team accommodates custom offset dimensions, reducing secondary machining and field fitting costs on complex modular skid packages.
Custom-forged pressure components engineered to operate in the world's most severe environments—from deepsea subsea manifolds to high-temperature refining units.
High-pressure oilfield lines operate under combined forces of internal hydraulic pressures, corrosive H2S/CO2 gases, dynamic thermal movement, and soil shifts. Shanxi Yuxin manufactures ASME B16.5 Class 900, 1500, and 2500 Weld Neck and Blind Flanges using low-alloy steels and NACE MR0175/ISO 15156 compliant materials. Our RTJ facing profiles provide leak-free performance even under heavy bending moments experienced on floating offshore platforms (FPSO) and subsea tie-backs.
Process piping loops in catalytic cracking plants, ammonia synthesis towers, and ethylene units handle aggressive media at elevated temperatures. We manufacture elevated-temperature alloy flanges (ASTM A182 F11/F22) and high-alloy stainless steel components that retain high yield strength and resist hydrogen embrittlement. Custom reducer flanges, heavy-wall weld neck flanges, and orifice flange sets are supplied complete with differential pressure tapping holes.
High-pressure steam boilers and heat recovery steam generators (HRSG) demand precision engineered tube sheets, long weld neck nozzles, and thick-wall blind flanges capable of surviving cyclic thermal shock. Shanxi Yuxin supplies CNC-drilled tube sheets up to 3,000 mm in diameter, featuring ultra-smooth tube hole pitch accuracy verified via multi-axis measuring probes, eliminating mechanical tube-expanding defects during heat exchanger fabrication.
As the global energy landscape transitions toward clean hydrogen and zero-carbon energy vectors, fluid containment systems require ultra-dense steel microstructures to prevent gaseous hydrogen permeation. Our advanced closed-die forge pressing and specialized normalizing heat treatment refine grain size down to ASTM Grade 7 or finer, delivering superior atomic containment for high-pressure gaseous hydrogen storage and distribution grids.
Ensuring complete regulatory alignment with North American, European, Middle Eastern, and Asia-Pacific engineering codes.
For piping systems installed across European Union member states, compliance with Pressure Equipment Directive 2014/68/EU is legally required. YUXIN provides certified material documentation under PED Annex I, Section 4.3 alongside AD 2000-Merkblatt W0 specifications, ensuring seamless review by notified bodies during plant commissioning.
Our pressure class products strictly mirror ASME B16.5, B16.47, B16.36 (Orifice Flanges), and MSS SP-44 dimensional parameters. On special request, we supply engineering calculation packages and material test reports suitable for obtaining Canadian Registration Numbers (CRN) across Canadian provinces.
To withstand long sea voyages, container humidities, and outdoor storage, all flange machined faces are treated with rust-preventive oil, hard plastic protective cap covers, and vacuum foil wrapping before being packed into ISPM-15 compliant fumigation-free plywood cases or heavy-duty steel framed crates.
Pioneering high-precision manufacturing, digital quality control, and low-carbon forging processes for the global industrial pipeline sector.
Shanxi Yuxin incorporates advanced Finite Element Analysis (FEA) software (DEFORM-3D) during product design phases. By modeling metal flow, temperature distribution, and strain rates within die cavities prior to physical forging, we eliminate internal void risks and optimize grain flow direction along high-stress flange neck transitions.
Complementing our forging shop, automated multi-tooling CNC lathes and 5-axis drilling machining centers utilize real-time laser tool measurement to guarantee dimensional tolerances within ±0.1 mm, assuring concentricity, pitch circle diameter (PCD) accuracy, and smooth serration finishes.
In response to global decarbonization mandates and ESG supply chain metrics, Shanxi Yuxin is systematically upgrading heating infrastructure to high-efficiency, zero-direct-emission electric induction furnaces. Furthermore, we are implementing a QR-code-based Digital Quality Twin system on all export orders, enabling project inspectors on site to scan the flange body stamp and instantly access full heat-treatment charts, chemical spectral reports, and NDT videos stored in secure digital archives.
Detailed technical answers provided by our senior metallurgical engineers to assist project managers and procurement specialists.
High-precision components manufactured to exact international standards with OEM/ODM support for international engineering projects.
