Stainless Steel Threaded Flanges (TH Flanges) are non-welded flange components designed for low-pressure pipeline connections, featuring internal or external threads that match pipeline threads. They are engineered with a focus on easy installation, detachable maintenance, and reliable sealing, making them suitable for various industrial and civil pipeline systems where welding is prohibited or inconvenient, such as gas transmission, water supply, and chemical auxiliary pipelines.
The flange body is crafted from high-quality stainless steel, with common grades including 304, 316, and 316L to meet different corrosion resistance needs. 304 stainless steel is widely used for general low-pressure scenarios, offering excellent rust resistance and basic mechanical strength, suitable for pipelines transporting non-corrosive media like water and compressed air. 316 and 316L stainless steel have enhanced corrosion resistance, capable of withstanding weak acids, alkalis, and chemical reagents, making them ideal for harsh environments such as chemical plants and gas transmission systems. All materials comply with international standards, ensuring no rust, thread damage, or leakage during long-term use.
A key structural feature of these flanges is their integrated thread design—either internal or external threads are precision machined on the flange neck, matching the thread specification of the connected pipeline. The thread surface is finely processed to be smooth and burr-free, ensuring tight engagement with pipeline threads to achieve reliable sealing and prevent medium leakage. The flange disc is designed with evenly distributed bolt holes for auxiliary fixing (if needed), enhancing connection stability. The flange diameter ranges from DN15 to DN500, and thread specifications (such as NPT, BSP) can be customized according to international standards or customer requirements.
In terms of processing technology, the flanges undergo precision forging, thread machining, and polishing procedures. The thread is processed by high-precision lathes to ensure accurate pitch and smooth engagement, avoiding thread slipping or poor sealing. The surface is treated with pickling and passivation, which not only improves the appearance but also enhances corrosion resistance and prevents thread corrosion. The connection method is simple: the flange is directly screwed onto the pipeline thread, no welding is required, which greatly reduces installation time and avoids welding risks, facilitating later disassembly and maintenance.
Regarding performance parameters, the maximum pressure-bearing capacity of stainless steel threaded flanges can reach PN10, and the applicable temperature range is from -20℃ to 150℃, fully meeting the requirements of low-pressure pipeline systems. The threaded connection ensures good sealing performance, and the stainless steel material guarantees long service life, reducing maintenance frequency and long-term use costs. They are lightweight and easy to transport, suitable for small-diameter pipeline connections and temporary pipeline systems.
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