Explore factory-direct forged components manufactured to ASME, EN, DIN, and JIS standard specs with EN 10204 3.1 traceability.
In modern process industries, pipe flanges act as critical structural nodes holding together high-pressure fluid lines, subsea infrastructure, chemical reactors, and thermal energy exchangers. Selecting exact material specifications and partner suppliers determines whether a refinery achieves a 30-year operational lifecycle or suffers catastrophic unplanned downtime caused by stress corrosion cracking (SCC), hydrogen embrittlement, or thermal fatigue.
The worldwide demand for high-integrity forged flanges is driven by expanding LNG transport networks, ultra-deepwater oilfield exploration, green hydrogen transition pipelines, and nuclear power plant modernizations. Standards compliance across ASME/ANSI B16.5, ASME B16.47, EN 1092-1, DIN, JIS, and GOST requires suppliers to possess advanced metallurgical control from raw ingot selection to final heat treatment.
Located in Dingxiang County, Shanxi Province—officially designated as the “Hometown of Forging in China”—Shanxi Yuxin Casting & Forging Co., Ltd. (YUXIN Flange) operates an integrated 10,000-ton capacity manufacturing center. Built on the core principle of “High starting point, high investment and high quality,” YUXIN combines raw steel heating, closed-die/ring-rolling forging, solution annealing, precision CNC machining, and automated NDT under a unified digital quality oversight system.
Understanding chemical compositions, yield strength, tensile properties, and corrosion resistance boundaries is paramount when drafting engineering specifications for pipe flanges, tube sheets, ring joint gaskets, and specialized pressure vessel nozzles.
Standard ambient & moderate temperature utility applications.
Corrosion resistance across acid, marine, and food-grade environments.
High-temperature creep resistance and extreme sour service longevity.
| Material Category | ASTM / ASME Grade | EN / DIN Equivalent | UNS / JIS Code | Operating Temp Range | Primary Industrial Use |
|---|---|---|---|---|---|
| Carbon Steel | ASTM A105 / A105N | C21 / 1.0432 (P250GH) | JIS SFVC21 / K03504 | -29°C to +425°C | General Hydrocarbon, Water, Steam lines |
| Low-Temp Carbon | ASTM A350 LF2 Cl.1 | 1.0566 (P355NL1) | JIS SGV410 / K03011 | -46°C to +345°C | Refrigeration, Gas Liquefaction, Cold Climate |
| Austenitic Stainless | ASTM A182 F304 / 304L | 1.4301 / 1.4307 (X5CrNi18-10) | JIS SUS304 / SUS304L | -196°C to +538°C | Food & Beverage, Cryogenic Nitrogen, Chemical |
| Moly Stainless | ASTM A182 F316 / 316L | 1.4401 / 1.4404 (X2CrNiMo17-12-2) | JIS SUS316 / SUS316L | -196°C to +600°C | Offshore Oil & Gas, Marine, Pharmaceutical |
| Cr-Mo Low Alloy | ASTM A182 F11 Cl.2 / F22 | 1.7335 (13CrMo4-5) / 1.7380 | JIS SFBA22 / K21590 | -29°C to +593°C | High-Pressure Steam, Thermal Power Boilers |
| Duplex Stainless | ASTM A182 F51 / F60 | 1.4462 (X2CrNiMoN22-5-3) | UNS S31803 / S32205 | -50°C to +280°C | Sour Oil Wells (NACE MR0175), Desalination |
| Super Duplex | ASTM A182 F53 / F55 | 1.4410 (X2CrNiMoN25-7-4) | UNS S32750 / S32760 | -50°C to +300°C | Subsea Trees, Acid Extraction, Phosphoric Acid |
Every industrial sector imposes distinct physical, chemical, and regulatory demands on flanged joints. YUXIN Flange engineers custom solutions tailored to operating pressures from Class 150 up to Class 2500 (PN6 to PN400) and sizes up to 120 inches (DN3000).
Upstream wellhead manifolds and downstream cracking units mandate high-integrity Weld Neck (WN) and Ring Type Joint (RTJ) flanges. YUXIN provides NACE MR0175/ISO 15156 compliant materials engineered to resist Hydrogen Induced Cracking (HIC) and Sulfide Stress Cracking (SSC) in sour gas service environments.
Supercritical coal thermal stations and combined-cycle gas turbine (CCGT) plants require heavy-wall ASTM A182 F11/F22/F91 forged flanges. Designed with long tapered hubs to minimize stress concentration during frequent thermal cycling and rapid startup procedures.
For shell-and-tube heat exchangers, YUXIN manufactures precision CNC-drilled Custom Tube Sheets and baffle plates per TEMA standards. Available in carbon steel, stainless steel, or clad options (e.g., A105 body explosion-clad with Titanium or Hastelloy).
Naval propulsion, ballast systems, and floating production storage (FPSO) units utilize Slip-On (SO), Lap Joint, and Stub End Flanges to allow easy bolt-hole alignment in confined marine machinery spaces.
Aggressive nitric, sulfuric, and organic acid lines specify 316L, 317L, or Duplex 2205 flanges with ultra-fine facing finish (AARH 125–250 µin or smooth finish Ra 3.2–6.3 µm) to achieve hermetic gasket sealing.
Hydraulic excavator systems, high-speed rail bogies, and heavy rolling mills demand forged structural rings, custom blind flanges, and expansion joint flanges engineered for heavy shock loads and high fatigue resistance.
Single-site quality control guarantees that every step—from raw steel billet verification to heat-treatment furnace monitoring—is documented under one unified heat number traceable back to the mill.
Incoming prime steel billets undergo PMI spectral analysis before precise sawing into forging blanks.
Induction heating followed by hydraulic press forging refines grain boundary orientation for maximum mechanical strength.
Computerized normalizing, quenching, and tempering eliminate internal stress and establish target yield/tensile values.
Permanent low-stress die stamping applies grade, pressure rating, size, standard code, and heat number identification.
Precision turning of flange face serrations, bevel ends, socket depths, and hub dimensions to ANSI/EN tolerance bands.
Automated bolt-circle drilling ensures exact hole pitch diameter, pitch circle diameter (PCD), and perpendicularity.
Black paint, yellow varnish, or rust-preventive oil applied prior to packing in fumigation-free ISPM-15 compliant plywood cases.
To qualify for tier-1 EPC projects and international distributor frameworks, Shanxi Yuxin Casting & Forging maintains audited quality credentials recognized across Europe, the Americas, the Middle East, and Asia-Pacific.
| Manufacturing Parameter | Standard Specification Scope | Technical Verification & Notes |
|---|---|---|
| Dimensional Standards | ASME B16.5, ASME B16.47 (Ser. A/B), EN 1092-1, DIN 2527-2638, JIS B2220, GOST 12820/12821, BS 4504 | Full size envelope from ½" to 120" (DN15 to DN3000); non-standard per customer engineering drawings. |
| Pressure Class Range | Class 150, 300, 400, 600, 900, 1500, 2500 lbs | PN6, PN10, PN16, PN25, PN40, PN64, PN100, PN160, PN250, PN400 | Hydrostatic pressure test reports provided upon request. |
| Facing Details | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Tongue & Groove (T&G), Male & Female (M&F) | Concentric or spiral serrated stock finish (125–250 µin AARH) per ASME B16.5 requirements. |
| Non-Destructive Testing (NDT) | Ultrasonic Testing (UT per ASTM A388), Magnetic Particle (MT), Liquid Penetrant (PT), Radiographic (RT) | 100% volumetric UT inspection available for critical forged rings and thick-wall weld necks. |
| Material Documentation | EN 10204 Type 3.1 Certified Mill Test Certificate (3.2 Third-Party Witnessed by TÜV / SGS / BV on request) | Complete chemical ladle analysis, heat treatment charts, tensile, yield, elongation, impact, hardness logs. |
From initial CAD evaluation to field bolt-up installation, YUXIN assigns dedicated metallurgical engineers to guide your order through every stage.
Send DWG, STEP, or PDF drawings. Our engineering team conducts reverse engineering and confirms forge feasibility before die tooling.
Engineers advise on optimal material selection, pressure class margin, facing type, and bolt-load calculations across standards.
Receive transparent proposals covering steel chemistry, heat-treatment specs, machining tolerances, lead time, and Incoterms.
In-process spectral analysis, mechanical impact testing, UT examination, and EN 10204 3.1 documentation for every single lot.
Optimized container loading plans (FCL/LCL), seaworthy rust-proof packaging, Certificate of Origin, and export customs filing.
First-article production samples, custom hard stamping, color coding, and private labeling tailored to stockist distributor requirements.
As global processing plants target Net-Zero emissions and higher pressure-temperature efficiency boundaries, YUXIN is pioneering next-generation metallurgical forging innovations.
Transitioning gas-fired billet heating furnaces to zero-emission induction technology powered by Shanxi's expanding renewable energy grid, drastically reducing the embodied carbon footprint per ton of forged steel.
Integrating automated robotic ultrasonic testing (UT) and high-resolution 3D laser arm inspection to verify internal sound metal structure and flange dimensional tolerances down to ±0.05 mm.
Expanding weld-overlay cladding capability (Inconel 625 / Hastelloy C276 over A105 body) for severe corrosion services in deep sea oil fields and high-temperature green hydrogen electrolyzer headers.
Long-term supply contracts with European stockists, Asian EPC conglomerates, and national oil companies.
In-depth technical meetings in Düsseldorf on customized flange supply agreements for 2026–2027 European project pipelines.
Showcasing non-standard tube sheets and Class 2500 RTJ ring flanges to global pipeline EPC contractors.
More than ten years of continuous certified supply to Manfred Geldbach Flansch und Fitting GmbH, validating long-term reliability.
Clear, authoritative responses for procurement officers, piping specifiers, and metallurgical engineers.
YUXIN produces forged flanges adhering to ASME B16.5, ASME B16.47 (Series A & B), EN 1092-1, DIN, JIS B2220, GOST 12820/12821, and BS standards. Size capacity spans ½" to 120" (DN15 to DN3000), with pressure classes ranging from Class 150 to Class 2500, and PN6 to PN400. Custom dimension flanges, tube sheets, and forged rings are produced directly from customer CAD drawings.
ASTM A105 is a normalized carbon steel suited for standard ambient/high-temperature utility services (-29°C to 425°C). ASTM A350 LF2 is specially formulated for low-temperature applications (-46°C) requiring mandatory Charpy V-notch impact testing. ASTM A182 F316L is an austenitic stainless steel with molybdenum addition (2-3%) and low carbon content (≤0.030%), offering high corrosion resistance in acidic, marine, and sour gas environments.
Every shipment lot includes an EN 10204 3.1 Mill Test Certificate (MTC) detailing raw material heat number, chemical composition, mechanical yield/tensile strength, elongation, Charpy impact values, hardness test results, and heat treatment cycle records. EN 10204 3.2 third-party inspection certificates witnessed by TÜV, SGS, or Bureau Veritas are provided upon request.
Standard size flanges (ASME B16.5 / EN 1092-1) in carbon steel or stainless steel held as forged blanks ship within 7 to 15 days after finish machining. Custom forged-to-order components, heavy ring rolling, or non-standard tube sheets typically require 20 to 35 days depending on raw billet procurement and specialized heat treatment cycles. Low MOQ is supported for project trials and stockist evaluation.
All machined flange faces are protected with anti-rust oil, black rust-inhibiting paint, or transparent yellow varnish. Pipe bores are fitted with protective plastic caps, and items are bundled or packed inside ISPM-15 compliant, heavy-duty fumigation-free plywood crates with internal waterproof membrane linings.
Complete product listings with original factory URLs for technical procurement inquiries.
Connect directly with Shanxi Yuxin Casting & Forging Co., Ltd. export engineering specialists. Send your piping bill of materials (BOM), CAD drawings, or material grade inquiries for a response within 24 hours.
