Sihe Steel
Sihe Steel
Explore our top-tier stainless steel coil tubes, engineered for high pressure, thermal integrity, and severe environment reliability.
Seamless coiled tubing has emerged as a cornerstone in modern processing plant design, marine oil exploration, and precision instrumentation. Unlike traditional straight-length pipes, which require repetitive orbital welds every 6 meters, seamless coiled pipes drastically lower the risk of failure points by providing a continuous, joint-free conduit. This structural integrity is critical in deep-sea hydraulic lines, geothermal downhole systems, and semiconductor gas distribution.
Liaocheng Sihe Stainless Steel Material LTD leverages advanced metallurgical drawing processes to deliver tubes that meet the rigid requirements of ASTM, ASME, EN, and JIS standards. By specializing in specialized alloys, we cater to demanding applications in extreme corrosion fields globally.
Liaocheng Sihe manufactures custom sizes within the designated parameters to satisfy your project's unique pressure ratings and tight tolerances.
| Specification Parameter | Imperial Range | Metric Range | Applicable Standards |
|---|---|---|---|
| Outer Diameter (OD) | 0.125 in to 1.00 in | 3.175 mm to 25.4 mm | ASTM A269, ASTM A213, EN 10216-5 |
| Wall Thickness (WT) | Up to 0.165 in | Up to 3.0 mm | ASME SB163, ASTM A269, GB/T 14976 |
| Continuous Length | Up to 32,800 ft | Up to 10,000 meters | Based on tube diameter and spool dimensions |
| Surface Finish Type | Bright Annealed (BA), Mechanically Polished (MP), Electropolished (EP) | Ra ≤ 0.4 µm for ultra-clean tubes | |
| Testing Protocols | Eddy Current, Hydrostatic, Pneumatic, Hardness, Flaring, Bending Tests | 100% Non-destructive testing coverage | |
How we guarantee micro-hardness control and surface brightness in every coil produced.
Our online bright annealing technology utilizes a pure hydrogen protective atmosphere at high temperature. This ensures that the coil tube structure undergoes recrystallization softening without oxidizing, yielding a pristine, mirror-like inner and outer surface while enhancing flexibility and mechanical properties.
To eliminate any localized micro-cracks or metal discontinuities, we deploy a comprehensive test sequence: 100% pneumatic leak test, hydrostatic pressure test matching customer requirements, hardness profiles, flaring limits, and microstructural analysis to verify absolute resistance to premature failure.
Sihe operates multiple high-precision cold-drawing and cold-rolling mills. Combined, our six production lines produce long continuous lengths that prevent mechanical discontinuities, lowering fluid turbulence and pressure drops in downstream industrial piping systems.
Liaocheng Sihe Stainless Steel Material LTD operates inside Liaocheng, Shandong—the steel pipe production hub of China. This localized industrial cluster yields deep logistic and material advantages. From raw ingot sourcing to logistics at Tianjin, Qingdao, and Shanghai ports, we balance high-performance delivery with optimized production timelines.
Our operation integrates automated cold-drawing and rolling processes, minimizing raw material waste and maximizing throughput. This strategic production footprint allows international engineering procurers to secure premium seamless coil tubes at competitive factory prices, complete with absolute trace-ability and standard documentation compliance.
We provide comprehensive secondary processing services, delivering ready-to-install fluid system components directly to your plant.
Accommodates standard and proprietary dimensions in 304, 316L, 2205, and nickel alloys.
Precision coiling and spiral bending tailored for downhole heat exchangers and gas coolers.
Laser and high-speed mechanical cuts minimizing deformation and burr formation.
Bright annealing alongside internal electropolishing for pharmaceutical fluids.
Ideal for automotive exhaust networks, chemical lines, and instrumentation hookups.
Providing essential support to critical machinery, transportation infrastructure, and thermal extraction projects worldwide.
A closer look at our product lines and custom profiles engineered at Liaocheng Sihe.
Manufactured primarily with Duplex 2205/2507 for critical deepsea exploration applications.
1/2 inch coiled tubes suited for high-pressure industrial applications and process control.
Engineered for high-temp structural stability in furnaces and recovery units.
As industrial processing temperatures climb and chemical environments become more volatile, general carbon steels and welded products are being phased out in favor of high-performance seamless coiled tubing. Three primary trends are transforming procurement specifications globally:
The clean energy transition requires materials that resist hydrogen embrittlement. Standard tubes develop structural fatigue when exposed to pressurized hydrogen molecules. Seamless stainless steel grades like 316L, processed with ultra-clean bright annealing, provide the necessary surface stability for hydrogen station fuel lines.
Offshore wells are drilling deeper into harsher environments, pushing hydraulic umbilical cables past 3,000 meters. The hydrostatic load demands seamless Duplex and Nickel alloys (Inconel 625, Incoloy 825) capable of high external pressure resistance without collapse, alongside protection against seawater-induced chloride pitting.
Mechanical stress analysis shows that longitudinal weld lines are susceptible to pitting and corrosion propagation. Chemical processing facilities are adopting ultra-long seamless coiled tubes to eliminate in-line orbit welding, thereby lowering maintenance overhead and mitigating hazardous chemical leaks.
Liaocheng Sihe complies with rigorous verification systems, ensuring all shipments meet standard requirements for pressure vessel safety and trace-ability.
Direct responses regarding technical specifications, lead times, ordering limits, and custom processing.
Explore our industrial-grade components, manufactured to support diverse structural and pipeline requirements.
