Direct mill supply of precision CNC-machined EN 1092-1, DIN, and ASME forged pipe flanges with 100% heat-number traceability and EN 10204 3.1 certification.
An in-depth analysis of Nominal Pressure (PN) mechanics, structural dimensions, facing finishes, and international standard harmonizations for industrial piping systems.
In global piping engineering, PN (Pressure Nominal) represents the maximum allowable working pressure in bars at a reference temperature of 20°C (68°F). The Chinese National Standards (GB/T 9112 through GB/T 9124) are fully harmonized with European standards (EN 1092-1) and German DIN standards (DIN 2501, 2631-2638).
Understanding PN ratings is critical for preventing catastrophic flange joint failures, gasket blowouts, and stress corrosion cracking in high-pressure transport lines:
Under China GB/T and EN 1092-1 standards, sealing performance is heavily dictated by the flange facing profile and surface roughness (Ra value). Shanxi Yuxin Casting & Forging Co., Ltd. manufactures all facing types with computerized micro-machining:
| Nominal Pressure (PN) | Equivalent Pressure (MPa / Bar) | Approx. ANSI / ASME Class | EN 1092-1 Type Reference | Primary Application Scenario |
|---|---|---|---|---|
| PN 6 | 0.6 MPa / 6 Bar | Class 75 (Low Press.) | Type 01 (Plate) / Type 11 (Weld Neck) | Low-pressure water, exhaust ducts, HVAC cooling loops. |
| PN 10 | 1.0 MPa / 10 Bar | Class 150 (Light Duty) | Type 01, Type 02 (Loose), Type 11 | Municipal water treatment, ambient fluid transport. |
| PN 16 | 1.6 MPa / 16 Bar | Class 150 Standard | Type 01, Type 11, Type 12 (Slip-on) | District heating networks, boiler utility feed lines. |
| PN 25 | 2.5 MPa / 25 Bar | Class 300 (Light Duty) | Type 11 (Weld Neck), Type 05 (Blind) | Chemical process lines, industrial steam distribution. |
| PN 40 | 4.0 MPa / 40 Bar | Class 300 Standard | Type 11, Type 05, Type 13 (Threaded) | High-temperature oil refineries, natural gas mains. |
| PN 63 | 6.3 MPa / 63 Bar | Class 400 / 600 | Type 11 (Weld Neck), Type 05 | Petrochemical hydrocrackers, high-pressure steam boilers. |
| PN 100 | 10.0 MPa / 100 Bar | Class 600 High Duty | Type 11 (RTJ Facing), Type 05 | Offshore gas lift manifolds, toxic gas containment. |
| PN 160 – PN 400 | 16.0 – 40.0 MPa | Class 900 / 1500 / 2500 | Type 11 (RTJ / Special Machined) | Subsea wellheads, ultra-high pressure hydraulic lines. |
Founded in 1992, Shanxi Yuxin Casting & Forging Co., Ltd. operates inside China's world-renowned "Hometown of Forging", delivering unparalleled metallurgical integrity, vertical production control, and continuous technological innovation.
Unlike lower-cost plate-cut or cast iron flanges that suffer from internal blowholes, micro-porosity, and structural weakness under thermal shock, YUXIN forged flanges undergo intense mechanical deformation. Hot closed-die forging and continuous ring rolling align the metal grain flow continuously along the flange geometry.
This yields exceptional directional tensile strength, superior impact toughness (tested down to -46°C for low-temp service), and ultra-high resistance to pressure pulsation in severe oil & gas applications.
Our integrated plant controls every stage from billet heating to final anti-rust coating. In-house computer-controlled heat treatment furnaces execute normalized, quenched & tempered (Q&T), or solution annealed thermal cycles customized to the alloy steel composition:
Our machine shop houses high-speed vertical CNC turning lathes, automatic indexing multi-spindle bolt hole drilling machines, and 3D coordinate measuring equipment. We guarantee strict adherence to bolt circle diameters (BCD), hub taper angles, facing thickness, and serration pitch specs.
Every production lot is documented with positive material identification (PMI), ultrasonic non-destructive testing (UT), liquid penetrant inspection (PT), and mechanical tensile/hardness reports.
How automation, green steel manufacturing, hydrogen energy readiness, and severe service alloy development are reshaping China's flange exporting industry.
Modern global EPC buyers require instant traceability. YUXIN integrates QR-code heat-number tracking directly into the raw billet stage. Laser marking machines engrave standard details, material heat numbers, pressure classes, and manufacturer stamps (YUXIN) on the flange rim, allowing digital verification from factory floor to jobsite installation.
With stringent global carbon footprint guidelines (CBAM compliance in Europe), Chinese forging facilities are transitioning to Electric Arc Furnace (EAF) steel billets powered by renewable energy grids. High-efficiency natural gas preheating furnaces equipped with energy recovery systems cut carbon emissions by up to 28% per ton of forged product.
As energy markets pivot to clean hydrogen transport and ultra-sour gas extraction, flanges must withstand Hydrogen Induced Cracking (HIC) and Sulfide Stress Corrosion Cracking (SSCC). YUXIN produces specialized PN flanges fully compliant with NACE MR0175 / ISO 15156 standards using low-sulfur, ultra-clean steel billets.
Tailored PN standard flange engineering solutions deployed across global energy, marine infrastructure, municipal utilities, and heavy equipment manufacturing.
High-pressure PN63 to PN400 Weld Neck (Type 11) and Blind Flanges (Type 05) engineered for wellhead manifolds, refinery hydrocrackers, and cross-country natural gas trunklines. Fully certified for NACE sour service and low-temperature impact conditions.
Precision forged rings, gear blanks, hubs, and custom flange plates machined to exacting tolerances for heavy hydraulic machinery, crane slewing bearings, industrial reducers, and power transmission assemblies.
Ultra-fine grain forged structural components tested for fatigue resistance and high dynamic stress loading. Engineered to satisfy stringent railway standards with low-temperature Charpy V-notch toughness down to -40°C.
Standard PN10/PN16 Slip-on (Type 12) and Plain Plate Flanges (Type 01) supplying high-volume compressed air, industrial cooling water, and paint shop chemical distribution lines for vehicle assembly plants.
High-strength hydraulic flange joints, wear-resistant forged rings, and structural attachment mounts optimized for hydraulic excavators, mining rigs, and heavy earthmoving equipment operating under severe cyclic loading.
Duplex stainless steel EN 1092-1 flanges, stub ends, and expansion joint flanges engineered to withstand harsh marine corrosion, saltwater ballast systems, offshore drilling rigs, and FPSO topside piping modules.
Mitigating supply chain risks, optimizing Total Cost of Ownership (TCO), and guaranteeing regulatory compliance for EPC contractors and stocking distributors worldwide.
International piping contracts require zero failure tolerance. YUXIN provides full material certification according to EN 10204 3.1 standard with every shipment. For critical projects, we seamlessly coordinate third-party witness inspection (EN 10204 3.2) with global inspection bodies including TÜV, Lloyd's Register, Bureau Veritas, DNV, and SGS.
Witness testing includes raw material ladle analysis, mechanical tension tests, Charpy impact testing, hydro-testing, and ultrasonic flaw detection.
Long-distance maritime transit subjects steel components to salt fog, humidity, and mechanical impact. Our export packing standard ensures pristine condition upon jobsite delivery:
Shanxi Yuxin Casting & Forging Co., Ltd. holds comprehensive international accreditations, verifying our compliance with European, American, and global pressure vessel directives.
Explore our specialized tube sheets, high-pressure forged rings, thread connections, and heavy-wall ANSI/EN custom pipe flanges.
Expert engineering answers regarding PN standards, material traceability, pressure-temperature ratings, and direct OEM procurement from China.
Bypass intermediary trading companies. Connect directly with Shanxi Yuxin Casting & Forging Co., Ltd. for factory-direct technical consultations, custom forging quotes, and project support.
