Explore our primary inventory of high-yield carbon steel, stainless steel, and alloy ASME/ANSI flanges manufactured under strict ISO 9001 and PED 2014/68/EU quality protocols.
In modern heavy process industries, piping integrity is non-negotiable. For over three decades, Shanxi YUXIN (operating directly within Dingxiang County—recognized globally as China’s premier forging capital) has stood as an authoritative manufacturer bridging rigorous American Metallurgical Standards (ASME/ANSI) with large-scale industrial manufacturing capabilities.
Unlike trading entities, YUXIN executes every critical phase of flange production under one roof. From raw billet inspection via X-ray fluorescence (XRF) Positive Material Identification (PMI) to hydraulic press closed-die forging, normalizing-heat treatment, CNC precision face serration machining, and 3D coordinate measuring machine (CMM) dimensional validation. Our annual output exceeds 10,000 metric tons of certified flanges, guaranteeing complete heat-number traceability from steel mill to final bolted joint.
Engineered to withstand cyclic thermal expansion, high internal pressures, and corrosive process fluids, our ANSI flange standard line fully satisfies ASME B16.5, ASME B16.47 (Series A & B), and MSS SP-44 requirements. Verified by TÜV Rheinland for PED 2014/68/EU and AD 2000-Merkblatt W0, every shipment is dispatched with certified Mill Test Reports (MTR) according to EN 10204 Type 3.1 or 3.2 third-party witness protocols (SGS, BV, DNV).
Navigating the nuances of American National Standards Institute (ANSI) flange governance requires exact metallurgical and mechanical understanding. Below is a comprehensive breakdown of pressure ratings, facing designs, and geometric dimensions dominating current global engineering specifications.
Covers pipe flanges and flanged fittings from Nominal Pipe Size (NPS) ½ through NPS 24 in pressure classes 150, 300, 400, 600, 900, 1500, and 2500. Key structural configurations include:
For large-diameter pipeline engineering, ASME B16.47 governs pressure classes 75 to 900. Procurement officers must distinguish between Series A and Series B:
Flange joint leak-tightness is dictated by face micro-geometry. YUXIN CNC lathes execute precise facing finishes strictly conforming to ASME B16.5 requirements:
A critical limitation of cheaper cut-plate or cast flanges is internal porosity and random grain direction, leading to micro-cracks under bolt torque. YUXIN employs closed-die radial forging processes that force continuous grain flow along the flange neck geometry. This results in superior Charpy V-Notch impact values (>47 Joules at -46°C for ASTM A350 LF2) and eliminates catastrophic fatigue failures under severe thermal cycling.
International EPC contractors, oil refinery procurement agents, and industrial valve distributors require more than competitive pricing; they require supply-chain security, rigorous documentation, and seamless regulatory compliance.
Counterfeit steel chemistry or inadequate heat treatment leads to pipeline bursts and costly shutdown downtime. YUXIN verifies every steel heat batch using Optical Emission Spectrometry (OES) and provides full traceability from raw ingot to finished flange, ensuring zero chemical or mechanical deviations.
Qualifying a Chinese forging manufacturer requires audited quality standards. We hold pre-approved manufacturer status for major energy consortia, supported by ISO 9001:2015, PED 2014/68/EU Annex I, AD2000 W0, and CRN (Canadian Registration Numbers) across operational provinces.
Flange raised faces and bevel ends are fragile during long-distance ocean freight. We deploy heavy-duty plastic cap protectors, anti-rust VCI oil coatings, vacuum thermal wrapping, and ISPM-15 compliant heat-treated fumigation-free wooden cases to guarantee pristine on-site delivery.
Standard ANSI dimensions must match specialized metallurgy to operate reliably under extreme temperature, sour corrosion, and ultra-high mechanical stress environments.
Hydrogen sulfide ($H_2S$) environment causes sulfide stress cracking (SSC) and hydrogen-induced cracking (HIC) in standard carbon steels. YUXIN provides forged ASTM A105N (Normalized) and ASTM A350 LF2 Class 1 flanges with restricted carbon equivalent ($CE \le 0.43\%$), controlled nickel content ($< 1.0\%$), and strict micro-hardness limits ($≤ 22 \text{ HRC}$), fully validated through 96-hour HIC testing.
Salt-spray exposure and submerged marine piping require exceptional pitting corrosion resistance. We forge ANSI B16.5 flanges in Duplex Stainless Steel (ASTM A182 F51 / UNS S31803) and Super Duplex (ASTM A182 F53 / F55 / UNS S32750) boasting Pitting Resistance Equivalent Numbers ($PREN \ge 40$). Ideal for topside manifolds, FPSO units, and desalination loops.
High-pressure steam lines operating above 540°C suffer creep deformation under sustained load. Our forge facility processes chrome-molybdenum alloy steels such as ASTM A182 F11 Class 2, F22 Class 3, and F91/F92. Controlled grain refinement and step-cooling heat treatments ensure microstructural stability over 30+ operating years.
Handling liquid methane at temperatures as low as -196°C requires high fracture toughness. We manufacture ANSI weld neck and slip-on flanges in Austenitic Stainless Steels (ASTM A182 F304L, F316L) and specialized nickel alloys, tested for Charpy impact absorption energy under liquid nitrogen temperatures.
The table below outlines our comprehensive standard capability matrix for global engineering compliance.
| Material Designation | Applicable ASTM Standard | Pressure Class Range | Size Availability | Operating Temperature Range | Special NDT & Quality Options |
|---|---|---|---|---|---|
| Carbon Steel | ASTM A105 / A105N | Class 150 – 2500 | NPS ½" – 120" (DN15 - DN3000) | -29°C to 425°C | Normalized, Hardness <22 HRC, PMI, UT |
| Low-Temp Carbon Steel | ASTM A350 LF2 (Cl 1 / Cl 2) | Class 150 – 2500 | NPS ½" – 60" | -46°C to 345°C | Charpy V-Notch Impact at -46°C, NACE MR0175 |
| Austenitic Stainless | ASTM A182 F304/304L / F316/316L | Class 150 – 2500 | NPS ½" – 72" | -196°C to 815°C | Solution Annealed, Intergranular Corrosion Test (ASTM A262) |
| Duplex & Super Duplex | ASTM A182 F51 / F53 / F55 | Class 150 – 2500 | NPS ½" – 48" | -50°C to 280°C | PREN ≥ 40, Ferrite Phase Calculation (35-55%) |
| Alloy Chrome-Moly | ASTM A182 F11, F22, F5, F9, F91 | Class 300 – 2500 | NPS ½" – 48" | Up to 650°C | Normalized & Tempered, High-Temp Ultrasonic Testing |
| High-Yield Pipeline Steel | ASTM A694 F42, F52, F60, F65, F70 | Class 150 – 900 | NPS 2" – 60" | -29°C to 120°C | 100% Magnetic Particle (MT) & Radiographic (RT) testing |
Every order executes through a rigorous, multi-gate Quality Control Inspection & Test Plan (ITP) verified by in-house Level II/III NDT technicians and independent third parties.
Before forging, raw round bars undergo SPECTRO chemical analysis, heat code verification, and macro-etch testing to detect inclusion levels, ensuring steel purity before heating.
Critical pressure flanges undergo 100% Ultrasonic Testing (UT) per ASME VIII Div 1 to check for internal laminations, alongside Magnetic Particle Inspection (MPI) on sealing faces.
We welcome witness inspections from SGS, BV, TÜV, DNV, and Intertek. Mill Test Certificates under EN 10204 3.1/3.2 detail full physical properties, heat treatment charts, and mechanical values.
YUXIN is actively modernizing heavy industrial manufacturing by adopting Industry 4.0 automation, carbon-conscious energy management, and digital supply-chain integration.
By integrating robotic manipulators with high-energy ring rolling mills, we maintain consistent forging temperature windows, reducing grain distortion and improving dimensional uniformity across mass production runs.
Aligned with global net-zero targets, YUXIN is increasing the integration of Electric Arc Furnace (EAF) green steel feedstock powered by regional renewable grid energy, reducing the embodied carbon footprint of our exported flanges.
To prevent material certificate tampering, our future quality management roadmap implements QR-coded Digital Twin MTCs stored on immutable ledgers, allowing site engineers to instantly verify flange origin via smartphone scanning.
Secondary portfolio covering specialized ANSI series, CNC threaded flanges, plain slip-on designs, and custom-machined heat exchanger tube sheets.
Clear, authoritative answers addressing technical specifications, order logistics, certification compliance, and non-standard custom manufacturing.
While both govern pipe connection flanges, ASME/ANSI B16.5 uses imperial measurements (NPS in inches, pressure classes 150-2500 psi), whereas EN 1092-1 uses metric dimensions (DN in mm, PN ratings in bar). Bolt hole circle diameters, bolt sizes, and flange thicknesses differ significantly and cannot be interchanged directly without transition spool pieces or dual-drilled custom flanges.
Yes. We specialize in producing ASTM A105N, A350 LF2, and alloy flanges tailored for $H_2S$-bearing sour environments under NACE MR0175/ISO 15156. Steel chemistries are vacuum-degassed, restricted in carbon equivalent, and undergo post-weld heat treatment (PWHT) or normalizing to guarantee maximum hardness remains below 22 HRC.
Every shipment includes a comprehensive EN 10204 Type 3.1 Mill Test Certificate containing heat number heat chemistry analysis (OES), mechanical yield/tensile strength, elongation, Charpy V-notch impact test results, hardness values, heat treatment records, and 100% visual/dimensional inspection approval. Type 3.2 certificates signed by independent inspectors (SGS, BV, TÜV) are available upon request.
Standard carbon steel ANSI B16.5 sizes held as forged blanks ship within 7 to 15 days following final CNC machining and coating. Custom drawing-based forgings, large-diameter ASME B16.47 Series A/B flanges, or special alloy grades (Duplex, F91) typically require 20 to 35 days for forging, heat treatment, NDT inspection, and seaworthy packing.
Unlike cast flanges which are vulnerable to shrinkage cavities, YUXIN utilizes high-tonnage hydraulic forging presses that achieve a minimum 3:1 forging reduction ratio. This intense pressure closes internal gas pockets and consolidates the steel grain structure. 100% Ultrasonic Testing (UT) per ASME SA-388 is applied to ensure zero internal voids.
