Explore our engineering-grade standard and custom pipe flanges certified to international ASME, EN, DIN, and ISO specifications.
Establishing benchmark reliability for critical fluid transfer networks across oil & gas, chemical refining, subsea extraction, and power generation environments.
Founded in 1992 in Dingxiang County, Shanxi—internationally acknowledged as the “Hometown of Forging in China”—Shanxi Yuxin Casting & Forging Co., Ltd. operates integrated closed-die, ring-rolling, and open-die forging lines capable of producing 10,000 metric tons of finished flanges annually.
Our quality management infrastructure is certified under international standards required by tier-1 global contractors:
Every manufacturing heat undergoes rigorous non-destructive and destructive evaluation to confirm structural micro-homogeneity:
Transitioning from traditional mechanical component forging into ultra-performance, sensor-integrated, and extreme-environment piping connection systems.
Modern industrial plants operate at expanding pressure-temperature envelopes. YUXIN’s R&D department is pioneering forgeability protocols for next-generation alloys:
Flange sealing integrity relies on micro-finish compliance and corrosion-resistant facing technologies:
Addressing zero-emission standards and leak detection in hydrogen and fugitive gas transport:
Engineered to withstand cyclic thermal expansion, high mechanical vibrations, aggressive chemical media, and extreme pressure differentials.
Offshore environments present combination threats of sour gas corrosion (H₂S cracking) and immense external hydrostatic pressures. Our solution portfolio includes:
Hydrocracking and catalytic reforming units operate under high partial pressures of hydrogen at temperatures exceeding 450°C. YUXIN provides:
Handling Liquefied Natural Gas (-162°C) or liquid nitrogen/oxygen requires materials that avoid ductile-to-brittle metallurgical transition:
Seawater Reverse Osmosis (SWRO) high-pressure pump lines operate in chloride-dense solutions causing pitting and crevice corrosion:
Combining localized raw material abundance, smart automation, and integrated logisitical connectivity to deliver unparalleled lead-time stability.
Shanxi Dingxiang houses China's densest metallurgical forging cluster. YUXIN benefits from immediate access to top-tier steel mills (Taiyuan Iron & Steel - TISCO, Baosteel), securing certified raw ingot supply within 24 hours of PO issuance. This geographic concentration reduces raw material procurement lead times by 70% compared to non-clustered manufacturers.
Our smart plant integration spans automated billet cutting, natural gas-fired continuous heating furnaces with closed-loop optical pyrometer temperature tracking, 4,000-ton hydraulic forging presses, and CNC ring rolling mills. Continuous heat-treatment line programming ensures grain refinement matching strict ASTM microstructural requirements.
With consolidated container packing bays and direct highway connections to Tianjin and Qingdao deepwater sea ports, YUXIN manages seamless FCL/LCL ocean exports. We maintain a permanent safety stock of 2,000+ tons of semi-finished standard flange blanks (A105 / F316L / F304L) for rapid emergency order dispatches within 7 to 10 working days.
A comprehensive engineering reference for EPC contractors, piping designers, and procurement managers specifying steel pipe flanges.
| Standard Family | Flange Types Available | Nominal Size Range | Pressure Class / Rating | Common Material Grades | Facing Styles |
|---|---|---|---|---|---|
| ASME / ANSI B16.5 | Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint | ½" – 24" (DN15 – DN600) | Class 150, 300, 400, 600, 900, 1500, 2500 | ASTM A105, A350 LF2, A182 F304/L, F316/L, F51 | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
| ASME B16.47 (Ser. A / B) | Large Diameter Weld Neck, Blind | 26" – 60" (DN650 – DN1500) | Class 75, 150, 300, 400, 600, 900 | ASTM A105, A350 LF2, A182 F11/F22, Duplex 2205 | Raised Face (RF), Ring Type Joint (RTJ) |
| EN 1092-1 (European) | Type 01 (Plate), Type 02 (Loose), Type 11 (Weld Neck), Type 05 (Blind), Type 34 (Ring) | DN10 – DN3000 | PN6, PN10, PN16, PN25, PN40, PN63, PN100, PN160, PN320, PN400 | P245GH, P280GH, C22.8, 1.4301, 1.4404, 1.4571, 1.4462 | Type A (Flat), Type B1/B2 (RF), Type C (Tongue), Type D (Groove) |
| DIN Standards | DIN 2527 (Blind), DIN 2631-2638 (Weld Neck), DIN 2576 (Slip-On) | DN10 – DN2000 | PN6 through PN100 | St37.2, C22.8, 1.4306, 1.4435, 1.4541 | Form C, Form D, Form E, Form F |
| JIS B2220 (Japanese) | SOP (Slip-On Hubbed), SOH, WN (Weld Neck), BL (Blind) | 10A – 1500A | 5K, 10K, 16K, 20K, 30K, 63K | SS400, SF440A, SUS304, SUS316, SUS316L | Flat Face (FF), Raised Face (RF) |
Ensuring frictionless international trade compliance, zero-defect transit packaging, and multi-lingual technical assistance.
Our dedicated international business desk provides technical consultation in English, German, Spanish, and Russian. We assist overseas EPC engineers with cross-referencing global flange standards (e.g., converting ASME to EN or JIS equivalents) and verifying gasket-flange-bolting system compatibility.
To eliminate rust, physical impact, or marine environment degradation during extended ocean transport, YUXIN employs rigorous seaworthy preservation protocols:
We welcome third-party inspection agencies appointed by global buyers—including TÜV, SGS, Bureau Veritas (BV), DNV, and Lloyd’s Register—to conduct witness points during forging, heat treatment, NDE testing, dimensional inspection, and final crate sealing.
Comprehensive standard inventory and custom forged components ready for ocean freight shipment.
Authoritative answers from YUXIN’s engineering department regarding manufacturing, quality testing, and international compliance.
Forged flanges undergo heavy plastic deformation under high forging ratios, refining the grain structure of the steel and aligning internal micro-flow lines along the mechanical shape of the flange. This eliminates internal porosity, voids, and segregation typical of cast fittings. Compared to plate-machined flanges, forged components exhibit dramatically superior directional mechanical properties, including enhanced tensile strength, higher impact toughness at extreme temperatures, and greater resistance to fatigue failure under cyclic pressure shocks.
Every raw steel billet received at our Dingxiang plant undergoes mandatory optical emission spectrometry (PMI) to verify chemical composition before heating. During production, heat treatment cycles are digitally recorded. Tensile, yield, elongation, hardness, and Charpy V-notch impact tests are performed on representative coupons from each heat lot. The resulting EN 10204 3.1 certificate detail actual laboratory values signed by our certified QA manager. For 3.2 certification, an independent inspector (such as TÜV or SGS) physically witnesses sampling, testing, and hard stamping.
We forge standard pipe flanges compliant with ASME B16.5 (sizes ½" to 24", Class 150 to Class 2500), ASME B16.47 Series A & B (sizes 26" to 60", Class 75 to Class 900), and EN 1092-1 / DIN standards (DN10 to DN3000, PN6 to PN400). For custom-engineered components, tube sheets, and heavy forged rings, our CNC ring rolling mills accommodate outer diameters up to 3,000 mm (120 inches) with single-piece weights reaching 5 metric tons.
For Raised Face (RF) flanges, we machine either spiral serrated or continuous concentric grooves with a roughness of Ra 3.2 µm to 6.3 µm (125 to 250 µin AARH) per ASME B16.5 guidelines, which allows metallic and spiral-wound gaskets to bite effectively into the seating face. For Ring Type Joint (RTJ) grooves, we execute ultra-precision CNC finishing to achieve surface roughness under Ra 1.6 µm (63 µin), guaranteeing flawless metallic contact seal performance.
We supply carbon steel flanges certified under NACE MR0175 / ISO 15156 and NACE MR0103, featuring strictly controlled carbon equivalents (CE < 0.43%) and hardness testing (< 22 HRC) to eliminate Hydrogen-Induced Cracking (HIC) and Stress Corrosion Cracking (SCC). Alternatively, we manufacture solid Duplex/Super Duplex flanges (S31803 / S32750) or perform automated Inconel 625 weld cladding overlays on carbon steel bodies, providing maximum chemical resistance at optimized capital cost.
Standard carbon and stainless steel flanges held as forged blanks ship within 7 to 15 calendar days post-machining. Fully custom or drawing-based forged items typically require 20 to 35 days depending on raw billet procurement and heat-treatment schedules. All products are coated with VCI rust-inhibiting oils, fitted with end face protectors, and secured inside fumigation-free, heavy-duty ISPM 15 wooden cases built for multi-stage ocean freight handling.
