Direct from Shanxi Yuxin Casting & Forging Co., Ltd. — ISO 9001, PED 2014/68/EU & AD 2000 certified manufacturing with full EN 10204 3.1 material traceability.
33 years of metallurgical precision in Dingxiang County, Shanxi — the internationally recognized "Hometown of Forging in China."
In modern industrial piping ecosystems, procuring high-integrity ASTM flanges is not merely a purchasing transaction; it is a critical safety parameter. Founded in 1992, Shanxi Yuxin Casting & Forging Co., Ltd. operates out of the Zhuangli Enclave Industrial Zone in Dingxiang County. Every carbon steel, alloy steel, and stainless steel flange is heated, closed-die forged, normalized, CNC machined, and non-destructively tested completely in-house. This single-site forging control ensures that the heat numbers stamped on your flange physically align with the EN 10204 3.1 / 3.2 Mill Test Reports delivered to your jobsite.
Understanding material science, international standards cross-referencing, and structural integrity demands across global pipeline networks.
The global standard for ambient and higher-temperature service in pressure systems. Forged under strict grain-refining normalizing treatment to eliminate residual stress, achieving tensile strength exceeding 485 MPa and yield strength over 250 MPa.
Engineered for aggressive corrosive media and extreme cryogenic or high-heat environments. Grades include F304/F304L, F316/F316L, and high-moly low-alloy steels like F11, F22, and F91, ideal for hydrogen processing and cracking units.
Specifically formulated for sub-zero impact resistance down to -46°C (-50°F). Required across LNG receiving terminals, Arctic pipeline segments, and high-altitude gas gathering stations demanding mandatory Charpy V-Notch impact testing.
| ASTM Material Specification | Equivalent EN / DIN Standard | Pressure Class Range | Service Temperature Range | Primary Industrial Application |
|---|---|---|---|---|
| ASTM A105 | EN 10222-2 C22.8 / 1.0460 | Class 150 – Class 2500 | -29°C to 425°C | Oil & Gas refining, steam lines, general pressure vessels |
| ASTM A350 LF2 Class 1 | EN 10222-3 P285NH / 1.0488 | Class 150 – Class 1500 | -46°C to 345°C | Low-temperature gas distribution, LNG, cold climate piping |
| ASTM A182 F316 / F316L | EN 10222-5 X2CrNiMo17-12-2 / 1.4404 | PN6 – PN400 / Class 150-2500 | -196°C to 815°C | Chemical synthesis, offshore marine, sour gas service (NACE) |
| ASTM A182 F11 / F22 | EN 10222-2 13CrMo4-5 / 10CrMo9-10 | Class 300 – Class 2500 | -29°C to 593°C | Power station boilers, thermal cracking, high-pressure steam |
| ASTM A182 F51 / Duplex 2205 | EN 10222-5 X2CrNiMoN22-5-3 / 1.4462 | Class 150 – Class 2500 | -50°C to 280°C | Subsea manifolds, desalination plants, chloride exposure |
How modern forging automation, AI quality diagnostics, and green steel initiatives are transforming pipeline connection technology.
Modern forging utilizes automated hydraulic press lines paired with computer-controlled ring rolling systems. This dynamic mechanical plastic deformation closes internal microporosities and optimizes crystalline grain alignment along the principal stress direction, outperforming cast alternatives in cyclic fatigue tests.
Transitioning from traditional manual spot-checks to full automated Ultrasonic Testing (UT) and Magnetic Particle Inspection (MPI). Ultrasonic waves probe deep within the flange hub to ensure zero subsurface micro-cracks, laminations, or inclusions prior to final precision CNC lathe facing.
As energy suppliers shift toward clean hydrogen transport, flanges require strict resistance to hydrogen embrittlement. YUXIN provides specialized low-sulfur, ultra-clean carbon and alloy steel flanges tested according to NACE MR0175/ISO 15156 standards for sour gas and hydrogen infrastructure.
Customized flange manufacturing engineered to satisfy extreme operation parameters across diverse geographic and industrial conditions.
High-temperature, high-pressure environments demand ASME B16.5 Weld Neck (WN) flanges featuring Raised Face (RF) or Ring Type Joint (RTJ) facings. YUXIN’s A105 and A182 F11 flanges withstand aggressive thermal cycling and avoid flange face distortion, maintaining seal integrity over 30+ year service lives.
Exposed to severe marine salt spray and mechanical wave vibration, subsea and topside piping require high corrosion resistance and structural toughness. We supply forged Duplex 2205, Super Duplex 2507, and 316L flanges complete with anti-corrosion protective coatings and custom cladding option.
Extreme pressure pulses in heavy excavator hydraulic manifolds and machinery demand robust, compact connection solutions. YUXIN manufactures heavy-duty socket weld, slip-on, and custom-machined non-standard forged rings built directly from customer blueprints and CAD drawings.
Expert insights addressing specification verification, material selection, standard compliance, and delivery logistics.
We produce complete ranges matching ANSI/ASME B16.5 (sizes 1/2" to 24", Class 150 to 2500), ASME B16.47 Series A & B (sizes 26" to 60"+), EN 1092-1 (Type 01, 02, 05, 11, 12, 13; PN6 to PN400), DIN standards, JIS B2220, BS 4504, and GOST 12820/12821. Custom dimensions up to 3,000 mm diameter are manufactured on dedicated ring rolling machines according to customer-supplied technical drawings.
Every shipment is accompanied by a full EN 10204 3.1 Inspection Certificate (with 3.2 third-party inspection by TÜV, SGS, or Lloyd's available upon request). Documentation includes raw material ladle heat analysis, mechanical tension test results, Charpy impact values, heat treatment charts, hardness test logs, NDT reports (UT/MT/PT), dimensional inspection sheets, and certificate of origin.
Flange faces are precision machined on high-speed CNC vertical lathes. Facing roughness is strictly controlled between 125–250 micro-inches AARH (3.2 to 6.3 micrometers Ra) for smooth stock finish or spiral serrated finish per ASME B16.5 requirements. Bolt hole pitch circles, bore tolerances, and hub neck bevel angles are 100% verified using 3D laser coordinate measuring machines.
Weld Neck flanges feature a long tapered hub that transfers mechanical stress directly into the pipe wall, minimizing stress concentrations at the base of the flange. They are preferred for severe operating conditions involving high pressure, sub-zero or elevated temperatures, and high shear forces. Slip-On flanges slide over the pipe exterior and are fillet welded both inside and outside; they offer lower initial material and installation cost but possess lower stress resistance under fatigue conditions.
Standard forged carbon steel blanks in common nominal sizes are stocked for rapid CNC machining and ship within 7–15 days. Custom forged items or alloy heat-treated batches typically require 20–35 days. We support low MOQ trial orders. For ocean transit, flange faces are treated with anti-rust varnish or light oil, bolt holes are protected, and products are packed in fumigation-free wooden cases or heavy-duty steel-banded pallets.
Browse our global export range of reduced bore, socket weld, threaded, and slip-on ASTM flange products.
