Engineered for high-pressure, corrosion-critical, and extreme temperature industrial applications.
Operating out of Dingxiang County, Shanxi—China's world-renowned "Hometown of Forging"—we combine traditional forging mastery with smart metallurgy.
In modern high-pressure fluid handling, energy transmission, and chemical synthesis, the term "Bar Rating" defines the fundamental structural limit of pipe connections, pressure vessels, and forged flanges. Expressed in the metric unit bar (where 1 bar equals 100,000 Pa or approximately 14.5038 PSI), a system's bar rating represents the maximum allowable working pressure (MAWP) that a flange assembly or forged bar component can safely sustain at design temperatures without undergoing plastic deformation or mechanical creep.
Selecting the optimal Bar Rating Manufacturers & Supplier requires deep technical insight into metallurgical grain structures, stress distribution analysis, thermal expansion coefficients, and international standard harmonizations. At Shanxi Yuxin Casting & Forging Co., Ltd. (YUXIN), we bridge the gap between heavy industrial forging and precision engineering, offering fully certified components ranging from PN6 (6 Bar) to PN400 (400 Bar / Class 2500).
Navigating global procurement requires translating between various international pressure designation systems. European projects generally utilize Nominal Pressure (PN in bar), whereas American petroleum and natural gas standards utilize Class ratings (PSI-based nominal designations).
| Pressure Class (ASME B16.5) | Equivalent Bar Rating (Metric PN) | Nominal Pressure (Bar / PSI) | Primary Industrial Application |
|---|---|---|---|
| Class 150 | PN 16 / PN 20 | 20 Bar (290 PSI) | HVAC, Municipal Water, Low-Pressure Steam |
| Class 300 | PN 40 / PN 50 | 50 Bar (725 PSI) | Chemical Processing, Refineries, Utilities |
| Class 600 | PN 100 | 100 Bar (1,450 PSI) | High-Pressure Gas Lines, Off-Shore Platforms |
| Class 900 | PN 150 | 150 Bar (2,175 PSI) | Subsea Injection, Heavy Industrial Steam |
| Class 1500 | PN 250 | 250 Bar (3,625 PSI) | Deepwater Hydrocarbon Lines, Boiler Feedwater |
| Class 2500 | PN 400 | 400 Bar (6,000 PSI) | Ultra-High Pressure Petrochemical Reactors |
The structural integrity of a high bar rating flange or forged component is determined during the ingot heating and forging phases. Unlike cast metal parts which often harbor micro-porosity and shrinkage voids, hot closed-die forging and ring-rolling refine the crystalline structure of the steel. This aligns the internal grain flow continuously along the contours of the component, resulting in superior yield strength, fatigue resistance, and impact toughness.
We work with a broad spectrum of certified industrial raw materials to ensure maximum performance across specialized operating environments:
Tailored engineering and bar rating compliance for mission-critical industrial infrastructure worldwide.
Class 900 to Class 2500 high bar rating Weld Neck and Blind Flanges engineered for sour service (NACE MR0175/ISO 15156). Designed to withstand extreme pressure fluctuations and corrosive hydrogen sulfide (H₂S) exposure.
Custom CNC-machined Tube Sheets and heavy-wall forged rings designed for thermal power boilers, nuclear heat transfer loops, and desalination plants handling severe thermal cycles up to 400 Bar ratings.
DIN / EN 1092-1 plain plate flanges and lap joint flanges with stub ends tailored for marine bilge, fuel transfer, and ballast systems requiring compact geometry, lower weight, and long-term corrosion resistance.
High-yield forged blanks, solid blind dished heads, and custom socket weld flanges engineered for hydraulic excavator manifolds and tunnel boring machines subject to intense vibration and cyclic shock loads.
Weld neck flanges with raised faces (RF) or Ring Type Joints (RTJ) matching exact schedule wall thicknesses (Sch 40 to XXS) to prevent localized turbulence, erosion, and flange neck cracking under high velocity flow.
Next-generation high density forged components certified for hydrogen containment and ultra-low emission sealing, preventing micro-gas permeability across high bar rating transport networks.
To guarantee complete metallurgical consistency across every order, Shanxi Yuxin operates a fully integrated single-site production workflow. Unlike trading desks or component aggregators, every stage—from billet inspection to final export packaging—is controlled under our ISO 9001 and PED 2014/68/EU audited quality management system.
Direct sourcing from certified tier-1 steel mills. Optical emission spectrometer (OES) analysis verifies exact heat chemical composition prior to cutting.
Programmable hydraulic forging hammers and ring-rolling mills convert heated billets into dense, grain-aligned rough forged blanks up to 3,000 mm diameter.
Computer-controlled furnaces perform Normalizing, Tempering, or Solution Annealing to relieve residual stress and optimize mechanical tensile/yield properties.
Permanent die-stamping of material heat numbers, size, pressure bar rating, standard, and factory identification logo for 100% lifetime traceability.
Multi-axis CNC lathes machine sealing faces, serrations (125–250 µin AARH/Ra), and weld bevel angles (37.5°) with sub-millimeter dimensional tolerances.
Automated drilling centers ensure absolute pitch circle diameter (PCD) accuracy, ensuring instant bolt-hole alignment during field installation.
Before any shipment leaves our Shanxi facility, our dedicated QA department conducts non-destructive testing (NDT) according to project specifications:
Providing seamless, fully compliant international delivery backed by top-tier quality certifications.
Every lot ships with comprehensive documentation covering raw material heat analysis, tensile testing, yield ratio, elongation, impact values, and dimensional sign-off sheets.
Flange faces protected with rust-inhibiting VCI oil or black anti-corrosion varnish. Items bundled in fumigation-free ISPM-15 compliant plywood cases or reinforced steel frames.
Standard forged blanks held in stock for 7–15 day delivery. Custom drawings fulfilled in 20–35 days. Supporting FOB, CIF, DDP, and DAP terms for seamless customs clearance.
Complete global export solutions for high pressure bar rating industrial pipework.
In-depth technical answers provided by YUXIN's senior metallurgy and piping engineers.
For custom non-standard forged flanges and tube sheets, the bar rating is calculated using finite element analysis (FEA) and design equations set forth in ASME Section VIII Division 1 (Appendix 2) or EN 13445. Factors include the material's allowable stress at design temperature, flange hub thickness, bolt circle diameter, gasket seating stress (m and y factors), and joint mechanical efficiency. YUXIN provides full engineering calculation sheets prior to production release.
PN (Nominal Pressure) is the European metric rating system defined under EN 1092-1, expressing maximum allowable working pressure in bar at room temperature (e.g., PN 40 = 40 Bar). ASME Class (defined under ASME B16.5) is an American nominal system (Class 150, 300, 600, etc.). While Class 300 roughly corresponds to PN 50 (50 Bar), bolt circle patterns, hole diameters, and facing dimensions differ between the two systems. Adapters or transition flanges are required to mate them.
For pressure bar ratings exceeding 100 Bar (Class 600+), Ring Type Joint (RTJ) facings are universally recommended. RTJ flanges feature precision CNC-machined metallic grooves that accommodate octagonal or oval metal ring gaskets (e.g., Soft Iron, SS316, or Inconel). As internal pipe pressure rises, compressive forces expand the metal gasket inside the groove, creating a high-integrity metal-to-metal pressure-energized seal.
Every shipment from YUXIN includes a complete EN 10204 3.1 Mill Test Certificate detailing: raw material melt heat number, chemical composition (C, Mn, Si, P, S, Cr, Ni, Mo), mechanical properties (yield strength, tensile strength, elongation, area reduction), heat treatment chart, non-destructive testing (UT/MT) reports, hardness measurements, dimensional inspection reports, and Certificate of Origin (CO).
For standard dimensions held as forged blanks, machining and dispatch take 7 to 15 days. For custom drawing-based forgings, special alloy grades (Duplex/Inconel), or large-diameter rings up to 3,000 mm, typical lead times range from 20 to 35 days depending on heat treatment cycles and third-party witness requirements (EN 10204 3.2).
Contact our engineering desk today for instant technical proposals, drawing reviews, and direct factory quotation within 24 hours.
