High-performance industrial flange solutions manufactured in-house with full EN 10204 3.1 material traceability.
Founded in 1992 in the Zhuangli Enclave Industrial Zone of Dingxiang County, Shanxi Province—widely recognized as China's "Hometown of Forging"—Shanxi Yuxin Casting & Forging Co., Ltd. (YUXIN Flange) stands as a world-class premier manufacturer of forged carbon steel, alloy steel, and stainless steel pipe flanges.
With an annual output exceeding 10,000 metric tons of flanges and 2,000 tons of specialized forged components, our integrated manufacturing plant encompasses every stage of production: raw billet heating, closed-die forging, normalizing & tempering heat treatment, multi-axis CNC thread chasing, and strict non-destructive testing (NDT).
Understanding mechanical load dynamics, thread profiles, pressure-temperature ratings, and alloy selections for non-welded piping systems.
Steel threaded flanges (also known as companion flanges or screwed flanges) possess a bore with female pipe threads matching male threads on the pipe wall. The joint achieves pressure sealing through thread interference combined with anaerobic thread sealants or PTFE compounds, eliminating post-weld heat treatment (PWHT).
We machine both NPT (National Pipe Taper, 1:16 taper angle per ASME B1.20.1) for leak-tight pressure service and BSPT (ISO 7-1 Whitworth 55° thread angle). Tapered threads compress crests into roots, creating a structural fluid barrier under high torque conditions.
In cyclic temperature or severe hydrocarbon processing service, YUXIN threaded flanges can be specified with a hub back-bevel to facilitate a seal weld between pipe and flange hub, ensuring zero fugitive emissions under ASME B31.3 piping codes.
| Flange Type | Standard Specs | Pressure Rating | Primary Welding Required? | Ideal Service Application |
|---|---|---|---|---|
| Threaded Flange (TH) | ASME B16.5 / EN 1092-1 Type 13 | Class 150 – 2500 (PN6-PN400) | No (Optional seal-weld) | Refineries, Explosive zones, Small bore, Utility air/water lines |
| Weld Neck Flange (WN) | ASME B16.5 / EN 1092-1 Type 11 | Class 150 – 2500 (PN6-PN400) | Yes (Full penetration butt weld) | High pressure, Extreme vibration, Thermal shock cycles |
| Slip-On Flange (SO) | ASME B16.5 / EN 1092-1 Type 12 | Class 150 – 1500 (PN6-PN100) | Yes (Double fillet weld) | Low-pressure fluid transport, Space-constrained installations |
| Blind Flange (BL) | ASME B16.5 / EN 1092-1 Type 05 | Class 150 – 2500 (PN6-PN400) | No (Bolted closure) | Pipeline isolation, Pressure vessel manways, Terminal caps |
From high-pressure hydrocarbon skids to municipal water grids, our steel threaded flanges guarantee operational safety.
In hazardous refinery environments where hot-work welding permits are restricted during operational maintenance, YUXIN carbon steel ASTM A105 and low-temp ASTM A350 LF2 threaded flanges provide fast, flame-free pipe tie-ins.
For compressed natural gas (CNG) and emerging green hydrogen transport, our high-density precision-forged stainless steel (ASTM A182 F316L) threaded flanges withstand gas permeation and eliminate micro-porosity risks.
Utilizing duplex stainless steels (UNS S31803 / F51) and specialized anti-corrosion yellow zinc or epoxy coatings, our flanges resist aggressive saltwater splash zones on ocean-going vessels and FPSO topsides.
How Shanxi Yuxin leverages geographical industrial clustering and digitalized forging automation to deliver global competitive edges.
Located in Dingxiang County, YUXIN benefits from immediate proximity to premier steel mills (such as Taiyuan Iron and Steel Group - TISCO). This localized supply network reduces billet procurement transit times and guarantees high-grade raw carbon and stainless steel stocks.
Manual thread cutting can introduce profile deviation. YUXIN utilizes modern multi-axis CNC turning centers equipped with real-time laser tool wear compensation, achieving precise NPT/BSPT pitch control and zero-galling thread smoothness.
Our computer-controlled normalizing, quenching, and tempering furnaces eliminate internal residual stresses caused by initial forging, ensuring consistent grain refinement and superior low-temperature Charpy V-notch impact toughness values.
Pioneering advancements in smart industrial piping, zero-emission coatings, and ultra-high-pressure metallurgy.
YUXIN is actively researching smart flange configurations integrated with micro strain-gauges and piezoelectric acoustic-emission sensors. These embedded sensors enable real-time predictive tracking of bolt tension relaxation, thread micro-vibration, and pressure fluctuations without disassembling the pipeline network.
To align with European Union REACH and RoHS environmental standards, our R&D team has deployed eco-friendly Zinc-Nickel alloy electroplating and ceramic PTFE barrier coatings. These non-polluting treatments provide over 1,500 hours of continuous salt-spray rust protection (ASTM B117 standard).
Streamlining international compliance, Third-Party Inspections (TPI), and export logistics for engineering EPCs.
Every shipment is backed by EN 10204 Type 3.1 certificates detailing exact chemical ladle analysis, tensile strength, yield point, elongation percentage, and Hardness (HBW/HRC).
For oilfield applications containing wet hydrogen sulfide ($H_2S$), flanges meet NACE MR0175 / ISO 15156 and NACE MR0103 standards with controlled carbon equivalent (CE) and hardness testing.
Precision thread zones are treated with heavy-duty anti-rust oil, fitted with plastic protective caps, and packed inside ISPM-15 compliant fumigation-free plywood cases with waterproof plastic liners.
Meeting local engineering codes across North America, the European Union, the Middle East, and Asia-Pacific.
YUXIN maintains extensive international product approvals including European Pressure Equipment Directive (PED 2014/68/EU Module H), German pressure vessel code AD 2000-Merkblatt W0 / TRD 100, ASME B16.5 / B16.47 manufacturing capability, and Special Equipment License of P.R. China (TS Certificate). Our dedicated export engineering desk provides technical support in English, German, Spanish, and Russian.
Answers to common engineering inquiries regarding thread selection, pressure limits, and ordering logistics.
Explore tube sheets, reducer flanges, and custom extension flange fittings manufactured to exact tolerances.
Contact our Senior Sales Engineering Team for instant project estimates, material test reports, or technical CAD drawing evaluations. 24-hour technical response guaranteed.
