Explore our primary selection of precision-forged PN Line flanges, slip-on fittings, weld neck components, and custom tube sheets designed for critical pressure piping systems across Europe, the Middle East, and global energy infrastructures.
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View Specifications →In modern process engineering, energy transmission, and heavy chemical infrastructure, the acronym PN (Pression Nominale) represents the core pressure rating metric defined under European and International standards (EN 1092-1, DIN 2501, ISO 7005-1). Sourcing high-integrity PN Line products—ranging from nominal pressure classes PN6, PN10, and PN16 for low-pressure utilities up to PN100, PN250, and PN400 for high-pressure hydro-processing—requires a sophisticated understanding of metallurgical science, forging integrity, and total cost of ownership (TCO).
Procuring "Discount PN Line" components does not imply compromising quality. By eliminating intermediary trading desks and sourcing directly from Shanxi Yuxin's integrated forging facility in Dingxiang, global EPCs achieve 18% to 32% cost optimization while securing 100% heat-traceable EN 10204 3.1 certified materials.
Global projects often bridge European EN/DIN standards and American ASME/ANSI frameworks. Our engineering team specializes in dual-certified PN Line flange solutions that satisfy both EN 1092-1 pressure-temperature ratings and ASME B16.5 dimensional tolerances simultaneously.
With a dedicated 10,000-ton annual forging capacity, 24-hour technical quotation turnarounds, and strategically managed raw billet stocks (carbon steel A105/Q235B, low-alloy A182 F11/F22, and stainless 304L/316L), we buffer global buyers against raw material volatility and supply chain bottlenecks.
Selecting the correct PN Line flange configuration is critical for maintaining mechanical joint integrity under severe thermal cycling, pressure surges, and corrosive environments. Below is an engineering overview of standard PN pressure ratings cross-referenced with equivalent ASME pressure classes, temperature limits, and recommended application boundaries.
| PN Rating (EN 1092-1 / DIN) | Equivalent ASME Class | Nominal Working Pressure (Bar @ 20°C) | Primary Flange Types | Recommended Service & Industry |
|---|---|---|---|---|
| PN 6 | Class 75 (Approx.) | 6 Bar (87 PSI) | Plain Plate (Type 01), Slip-On (Type 12) | Low-pressure municipal water, HVAC ducting, exhaust gas lines |
| PN 10 | Class 150 (Light) | 10 Bar (145 PSI) | Slip-On, Flat Face Plate, Blind (Type 05) | Water treatment, low-pressure utility gas, agricultural lines |
| PN 16 | Class 150 Standard | 16 Bar (232 PSI) | Weld Neck (Type 11), Slip-On, Threaded (Type 13) | District heating, chemical processing utilities, marine ballast |
| PN 25 | Class 300 (Light) | 25 Bar (362 PSI) | Weld Neck, Loose Hubbed (Type 02/34), Reducer | Industrial steam lines, mid-stream oil transmission, refinery process |
| PN 40 | Class 300 Standard | 40 Bar (580 PSI) | Weld Neck (RF / Tongue & Groove), Socket Weld | High-pressure steam, petrochemical processing, boiler feed water |
| PN 63 / PN 100 | Class 600 | 63 – 100 Bar (913 – 1450 PSI) | Weld Neck (RTJ Facing), High-Yield Forged Rings | Offshore oil platforms, high-pressure gas pipelines, hydrogen storage |
| PN 160 – PN 400 | Class 900 to Class 2500 | 160 – 400 Bar (2320 – 5800 PSI) | Heavy Forged Weld Neck, Special Alloy Blanks | Hydro-cracking units, subsea manifolds, ultra-critical power generation |
The mechanical performance of any PN Line installation relies heavily on selecting forged steel grades matched to system temperature and corrosive fluid dynamics:
The standard choice for non-corrosive ambient to elevated temperature service (-29°C to +425°C). Forged P250GH and A105 billets offer superior tensile strength (>= 485 MPa) and precise grain alignment following normalizing heat treatment.
Engineered for cryogenic gas transmission and arctic pipeline installations. Standard Charpy V-Notch impact testing verifies mechanical toughness down to -46°C (-50°F).
Essential for aggressive chemical media, offshore saltwater environments, and sour gas systems. Duplex F51 offers double the yield strength of 316L along with exceptional resistance to pitting and crevice corrosion.
A common failure mode in PN Line bolted flange joints stems from incorrect flange face machining. EN 1092-1 specifies Form B1 (standard raised face with Ra 3.2 – 12.5 µm turning) for general gaskets, whereas Form B2 (smooth finish Ra 0.8 – 3.2 µm) is mandatory for metallic spirally-wound and PTFE gaskets. Shanxi Yuxin's precision CNC lathes guarantee automated surface profile verification on 100% of manufactured flange faces.
Shanxi Yuxin Casting & Forging Co., Ltd. supplies forged PN Line products tailored to strict sector specifications across five global industrial verticals:
High-temperature PN40 to PN100 weld neck flanges designed to withstand hydrogen embrittlement, thermal creep, and cyclic pressures in catalytic cracking and hydro-desulfurization towers. Fully compliant with NACE MR0175 / ISO 15156 sour gas standards.
Duplex stainless steel PN63/PN100 RTJ (Ring Type Joint) flanges for FPSO topsides, subsea manifold trees, and ballast piping. Protected against extreme marine atmospheric exposure with C5-M high-durability epoxy coatings.
Heavy-wall alloy weld neck flanges (A182 F11/F22) and CNC-drilled tube sheets engineered for high-pressure steam boilers, heat exchangers, and thermal power plant headers operating above 540°C.
Large-diameter PN10 and PN16 plain plate flanges, expansion joint flanges, and slip-on fittings (DN500 up to DN3000) for cross-country water distribution networks, desalination plants, and wastewater processing.
Forged rings, structural connection hubs, and hydraulic flange blocks manufactured for high-speed rail bogies, heavy excavators, and industrial press systems requiring high fatigue life.
As industrial decarbonization accelerates worldwide, piping systems must evolve to handle zero-emission energy vectors such as green hydrogen, supercritical CO2, and synthetic fuels. Shanxi Yuxin is advancing flange engineering through four key technological pillars:
Developing low-permeability flange face profiles and specialized micro-alloyed steel compositions to eliminate hydrogen embrittlement in pure H2 transmission lines up to PN250.
Integrating embedded piezo-electric stress sensors into PN Line flanges to provide continuous real-time monitoring of bolt tension, gasket stress, and micro-leakage in remote pipelines.
Upgrading die forging hydraulic presses with closed-loop computer control, achieving near-net-shape ring rolling that reduces raw material waste by 22% and lowers carbon intensity per ton.
Deploying inline 3D optical laser scanners across all CNC machining centers to verify bolt hole pitch, flange thickness, and face roughness against CAD models in real time.
Founded in 1992 in the Zhuangli Enclave Industrial Zone of Dingxiang County, Shanxi Province—officially recognized as the “Hometown of Forging in China”—Shanxi Yuxin Casting & Forging Co., Ltd. operates as a true manufacturer, not a trading desk. Our quality management ecosystem is audited and verified by leading international notified bodies.
ISO 9001:2015 quality system certified by TÜV CERT. Manufacturing approval according to Pressure Equipment Directive (PED 2014/68/EU), AD 2000-Merkblatt W0 / TRD 100, and VdTÜV 350 / 399-3 material standards.
Every production heat undergoes comprehensive Non-Destructive Testing (NDT), including Ultrasonic Testing (UT per EN 10228-3), Magnetic Particle Inspection (MT), Liquid Penetrant Inspection (PT), and Positive Material Identification (PMI) via XRF analyzer.
Full compliance with EN 10204 Type 3.1 material test certificates (and optional Type 3.2 third-party witnessed inspection by DNV, Bureau Veritas, SGS, or Lloyd’s Register). Permanent physical die-stamping guarantees tracking back to the raw ingot heat number.
Chemical spectral analysis of incoming steel bars.
Electric induction heating & hydraulic ring rolling.
Normalizing, quenching, and tempering cycle control.
Heat number, standard, PN rating & size marking.
High-precision turning of flange faces and bores.
Automated bolt hole positioning per EN 1092-1.
Anti-rust varnish application & seaworthy crating.
Our engineering desk answers critical procurement questions for EPC project managers, stockists, and piping engineers searching for reliable PN Line suppliers:
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