Direct Factory Supply from Shanxi Yuxin Casting & Forging — ISO 9001 & PED Certified European Standard Flanges
In modern industrial piping design, pressure containment integrity hinges upon precise standardization. The designation "PN" (Nominal Pressure / Pressure Nominale) represents the metric rating system standardized primarily across Europe and international markets under EN 1092-1, DIN (Deutsches Institut für Normung), and ISO 7005 standards. A PN Flange Table serves as the mandatory reference matrix for mechanical engineers, piping designers, and procurement managers. It specifies critical dimensional parameters—including outer diameter (OD), bolt circle diameter (PCD), bolt hole quantity, thread size, hub thickness, and flange height—across pressure classes ranging from PN6 (6 bar) up to PN400 (400 bar).
Selecting reliable China PN Flange Table Suppliers requires an in-depth understanding of material science, precision drop forging, automated thermal treatment, and regulatory compliance. Located in Dingxiang County, Shanxi Province—recognized worldwide as the official "Hometown of Forging in China"—Shanxi Yuxin Casting & Forging Co., Ltd. (YUXIN) has been at the forefront of forged steel flange production since 1992. By bridging traditional heavy forging mastery with Industry 4.0 smart manufacturing, YUXIN delivers high-integrity PN flanges engineered to withstand extreme thermomechanical cyclic loads in oil & gas refineries, chemical processing plants, marine shipbuilding, and nuclear energy infrastructure.
While historic legacy specifications frequently referenced individual DIN tables (such as DIN 2527 for Blind Flanges, DIN 2633 for PN16 Weld Neck Flanges, or DIN 2576 for Flat Slip-On Flanges), global engineering standards have harmonized under EN 1092-1. When evaluating China flange manufacturers, buyers must verify that factory tooling supports both legacy DIN dimensions and updated EN 1092-1 Type designations (Type 01, Type 02, Type 05, Type 11, Type 12) to ensure seamless installation interchangeability without flange face misalignment or bolt hole mismatch.
Strategic Drivers Shaping High-Pressure Piping Infrastructure, Green Energy Transitions, and Risk-Averse Procurement
As global energy infrastructure transitions toward Green Hydrogen, Ammonia carrier transport, and Liquefied Natural Gas (LNG) regasification terminals, flange pressure ratings must guarantee zero micro-leakage. High-pressure PN100 to PN400 weld neck flanges forged from fine-grain austenitic and duplex stainless steels (1.4404 / 316L, 1.4462 / 2205) are replacing standard carbon grades to prevent hydrogen embrittlement under cryo-temperatures down to -196°C.
Global Engineering, Procurement, and Construction (EPC) firms no longer prioritize initial unit price alone. Unplanned refinery downtime costs upwards of $50,000 per hour. Consequently, procurement intent focuses on verified structural reliability, mandatory EN 10204 3.1 / 3.2 Material Test Certificates (MTC), 100% Ultrasonic Testing (UT), and full raw material heat traceability to eliminate catastrophic flanged joint failures.
European chemical hubs and power plants demand strict adherence to the Pressure Equipment Directive (PED 2014/68/EU) and AD 2000-Merkblatt W0. Importers require Chinese flange factories to demonstrate energy-efficient electric heating furnaces, low-carbon steel sourcing, and documented quality audits by European notified bodies such as TÜV CERT.
How Shanxi Yuxin Integrates Advanced Automation, Closed-Die Forging, and Digital Traceability
The global flange manufacturing landscape has evolved dramatically. Simple manual forging hammers have given way to integrated digital forging lines. Shanxi Yuxin Casting & Forging Co., Ltd. operates a fully integrated 10,000-ton annual capacity production facility in Shanxi, leveraging modern Industry 4.0 transformations across four critical core competencies:
YUXIN utilizes high-speed vertical CNC ring rolling mills and hydraulic closed-die forging presses. Grain flow lines follow the geometric contour of the flange hub and sealing face, maximizing tensile strength, yield strength, and impact toughness at sub-zero conditions compared to cheap flame-cut plate rings.
To eliminate internal residual stress, all forged blanks pass through gas-fired continuous heat-treatment furnaces programmed for exact Normalizing, Solution Annealing, or Tempering cycles. Digital pyrometers record thermal curves per heat batch, guaranteeing uniform Brinell hardness across the entire flange body.
Flange bolt holes, raised face (RF) phonographic serrations (125-250 µin AARH), and ring-type joint (RTJ) grooves are machined on high-precision CNC vertical lathes. Dimensions are verified using 3D laser coordinate measuring machines (CMM) to ensure pitch circle tolerances remain within ±0.2mm.
Dimensional Overview, Bolt Hole Configurations, Pressure-Temperature Ratings, and Cross-Standard Equivalents
Understanding the exact engineering dimensions of PN flange tables is fundamental for cross-border engineering projects. Below is a comprehensive reference matrix comparing European EN 1092-1 nominal pressure ratings (PN6 to PN100) against equivalent ASME pressure classes, working pressure parameters, and recommended gasket sealing face types.
| Nominal Pressure (PN) | Equivalent ASME Class | Working Pressure (Bar at 20°C) | Hydrostatic Test Pressure (Bar) | EN 1092-1 Flange Types Available | Facing Types (EN 1092-1) | Primary Industrial Applications |
|---|---|---|---|---|---|---|
| PN 6 | Class 75 (Approx) | 6 Bar | 9.0 Bar | Type 01 (Plate), Type 05 (Blind), Type 11 (Weld Neck) | Type A (Flat), Type B1 (Raised Face) | Low-pressure building services, HVAC, municipal water supply |
| PN 10 | Class 150 (Low Limit) | 10 Bar | 15.0 Bar | Type 01, Type 02 (Loose), Type 05, Type 11, Type 12 (SO) | Type B1 (RF), Type B2 (Smooth RF) | Wastewater treatment plants, cooling water circuits, low-temp gas lines |
| PN 16 | Class 150 (Standard) | 16 Bar | 24.0 Bar | Type 01, Type 05, Type 11, Type 12, Type 13 (Threaded) | Type B1, Type C (Tongue), Type D (Groove) | Chemical distribution, steam utility piping, shipbuilding ballast systems |
| PN 25 | Class 300 (Low Limit) | 25 Bar | 37.5 Bar | Type 05 (Blind), Type 11 (Weld Neck), Type 12 (Hubbed SO) | Type B1, Type E (Spigot), Type F (Recess) | High-pressure district heating, boiler feed manifolds, oil refinery utilities |
| PN 40 | Class 300 (Standard) | 40 Bar | 60.0 Bar | Type 05 (Blind), Type 11 (Weld Neck), Type 32 (Weld Neck Collar) | Type B2, Type C/D, Type G/H (O-Ring Groove) | Petrochemical processing, offshore oil production, gas transmission lines |
| PN 63 | Class 400 / 600 | 63 Bar | 94.5 Bar | Type 05 (Blind), Type 11 (Heavy Weld Neck) | Type B2 (Smooth RF), Type J (RTJ Joint) | High-pressure gas storage, hydraulic power stations, chemical reactors |
| PN 100 | Class 600 (High Limit) | 100 Bar | 150.0 Bar | Type 05, Type 11 (High-Yield Alloy Forged) | Type B2, Type J (Ring Joint Face) | Subsea wellheads, extreme pressure steam, hydrogen synthesis loops |
To ensure perfect interoperability with China PN Flange Table suppliers, engineers must specify the correct standard type designation during enquiry:
Rigorous Quality Assurance Framework Guarantees Full Compliance with International Petrochemical Standards
YUXIN forges PN flanges across all major material categories: Carbon Steel (P245GH, P250GH, S235JR, ASTM A105, C22.8), Low-Temperature Carbon Steel (ASTM A350 LF2, P280GH), Stainless Steel (1.4301 / 304, 1.4404 / 316L, 1.4541 / 321, 1.4571 / 316Ti), and High-Yield Duplex (1.4462 / 2205, 1.4410 / 2507).
Every forging lot undergoes strict Non-Destructive Testing. Ultrasonic Testing (UT per EN 10228-3) detects internal voids, inclusions, or laminations. Magnetic Particle Testing (MT) and Liquid Penetrant Testing (PT) verify surface integrity across sealing faces and welding bevels.
Material Test Certificates (MTC) are issued with full heat number traceability. Documented chemical composition (via optical emission spectrometry), mechanical tensile tests, Charpy V-notch impact tests at -40°C, micro-structure grain size analysis, and hard copy heat treatment chart records are supplied with every order.
Tailored Pressure Piping Components Serving Specific Regional Infrastructure Ecosystems
Supplying German and Dutch chemical manufacturing facilities with EN 1092-1 Type 11 PN40 flanges forged from P250GH and 1.4404. Meets strict TA-Luft fugitive emission standards when assembled with spiral wound gaskets, preventing hazardous chemical leakage in volatile fluid manifolds.
Delivering heavy-wall PN63 to PN100 blind flanges and custom tube sheets for sea-water reverse osmosis (SWRO) plants in the UAE and Saudi Arabia. Forged in Super Duplex 2507 (1.4410) to eliminate pitting corrosion from high chloride concentrations and high operating pressures.
Providing cost-effective PN10 and PN16 flat plate flanges (Type 01) and slip-on flanges (Type 12) for large-diameter water transmission pipelines, thermal power station cooling loops, and combined-cycle gas turbine (CCGT) projects in Vietnam, Indonesia, and Malaysia.
Explore High-Performance Heavy Forgings, Reducing Flanges, Stub Ends, and Threaded Components
Expert Engineering Answers to Common Technical and Procurement Inquiries
PN (Pressure Nominale) is a metric rating system designated in bar (e.g., PN16 = 16 bar working pressure at ambient temperature). It is defined primarily by European standards (EN 1092-1, DIN, ISO 7005). ASME Class is an imperial system expressed in psi (e.g., Class 150, Class 300). While PN16 roughly corresponds to ASME Class 150 and PN40 to ASME Class 300 in working pressure capabilities, their dimensional parameters—such as bolt circle diameter (PCD), bolt hole count, and flange thickness—are completely different and non-interchangeable without custom transition flanges or adapter spools.
In EN 1092-1, standard flange geometry is categorized by Type numbers rather than separate standard sheets:
• DIN 2576 (PN10 Flat Flange) → EN 1092-1 Type 01 PN10
• DIN 2527 (Blind Flange) → EN 1092-1 Type 05
• DIN 2633 (PN16 Weld Neck) → EN 1092-1 Type 11 PN16
• DIN 2566 (Threaded Flange) → EN 1092-1 Type 13
YUXIN maintains dual-capability CNC machining templates to supply either traditional DIN markings or modern EN 1092-1 stamping as requested by your engineering schedule.
Every shipment is accompanied by an EN 10204 3.1 Inspection Certificate direct from our mill laboratory (or EN 10204 3.2 third-party witnessed by SGS, TÜV, or Lloyd's Register upon request). The MTC covers chemical composition heat analysis, mechanical yield/tensile/elongation values, Charpy impact test results, hardness values (HBW), heat treatment logs, non-destructive test reports (UT/MT), and 100% dimensional inspection verification sheets.
Yes. Beyond standard catalog PN flange tables, YUXIN features a dedicated OEM engineering department. We manufacture custom forged rings, oversized PN flanges up to 3,000mm diameter (DN3000), heavy wall vessel flanges, expansion joint flanges, and CNC-drilled shell-and-tube heat exchanger tube sheets directly from your DWG, STEP, or PDF engineering files.
To prevent atmospheric corrosion during maritime transit, flanges are treated with transparent rust-preventive varnish, yellow anti-rust lacquer, black varnish, or hot-dip galvanizing per EN ISO 1461. Flange sealing faces are protected with plastic end covers. Items are securely packed in ISPM-15 compliant fumigation-free plywood cases or heavy-duty wooden pallets strapped with steel banding and wrapped in moisture-proof plastic film.
