Sihe Steel
Sihe Steel
Explore our primary selection of precision-drawn, bright annealed, and polished stainless steel coiled tubes, capillary lines, and structural pipes configured for demanding commercial environments.
In modern precision fluid handling, instrumentation, and subsea engineering, the integrity of metal conduits determines the safety of the entire operational architecture. Polished stainless steel coil tubing represents a specialized class of long-length, weld-free piping designed to eliminate localized weak points, reduce leak paths, and deliver exceptionally low surface roughness (Ra). By selecting high-precision coiled solutions over traditional stick pipes, engineers achieve dramatic efficiency gains in high-pressure, high-temperature, and severely corrosive conditions.
At Liaocheng sihe stainless steel material LTD, we control the mechanical and microstructural properties of stainless steel, delivering solutions compliant with GB, ASTM, ASME, JIS, and EN standards. From standard austenitic alloys to high-alloy duplex steels, our materials are tailored to minimize internal friction and chemical contamination, providing critical advantages for high-purity processes and heavy-duty extraction fields alike.
Continuous drawing and advanced vacuum annealing secure an ultra-fine grain matrix, avoiding the structural degradation common to multi-joint welded setups.
By offering chemical polishing and bright annealing options, we significantly reduce internal surface roughness, mitigating pitting and crevice corrosion propagation.
Seamless coiled structures are built to withstand cyclic fatigue, making them ideal for subsea hydraulic lines and oilfield downhole injection valves.
Different operating mediums require target-matched corrosion resistance. Our specialized steel configurations address diverse mechanical loads, temperature thresholds, and chemical environments:
The standard choice for general mechanical engineering, food processing, and automotive industries. Low carbon (304L) prevents chromium carbide precipitation during thermal transitions.
Enhanced with molybdenum for superior resistance to chloride-induced pitting. Essential for marine control lines, pharmaceutical purification, and analytical instruments.
A dual-phase microstructure combining austenite and ferrite. Delivers twice the mechanical strength of typical austenitic steels and outstanding stress corrosion cracking (SCC) resistance.
Nickel-iron-chromium-molybdenum superalloys. Specifically formulated to survive extreme acidizing environments, sour gas wells, and ultra-high temp heat exchangers.
Figure 1: Fully automated high-precision drawing lines at Liaocheng Sihe production workshop.
Our production inventory spans outer diameters ranging from 0.125 inches (3.175 mm) to 1 inch (25.4 mm), with wall thicknesses reaching 0.165 inches (3 mm). For critical subsea umbilicals, we produce continuous coil configurations up to 32,800 feet (10,000 meters) without orbital butt welds.
Standard cold-drawn tubing often retains surface scale and structural tension that can impair operational performance. At Liaocheng Sihe, we use an advanced inline bright annealing (BA) system. This heat treatment takes place in a controlled, oxygen-free hydrogen atmosphere, softening the metal while maintaining a highly reflective, scale-free finish.
Our facility features six state-of-the-art production lines, supported by a rigorous quality assurance framework. Every meter of polished stainless steel coil tubing undergoes exhaustive testing before shipment:
High-precision polished coils serve as critical infrastructure in multiple engineering domains. Below are key applications where Liaocheng Sihe coiled tubing delivers vital performance advantages:
Tailored support for grades like 304, 316L, and 2205, spanning custom diameters from 6.35mm to 19mm.
Specialized forming, including spiral configurations designed for high-efficiency heat exchangers.
Laser and mechanical options providing clean, burr-free cuts ready for immediate deployment.
Optimized end connections for automotive exhaust paths, chemical lines, and process instruments.
High-thermal efficiency continuous loops designed to operate reliably under constant temperature cycles.
Zero-leak continuous coils carrying modern refrigerants under high working pressures.
Highly inert piping pathways designed to safely transport corrosive chemical reagents and solutions.
Mirror-polished internal surfaces to prevent bacterial buildup and facilitate CIP cleaning cycles.
Cleanroom-ready capillary lines engineered for chemical purity and minimal particulate retention.
Steam and condenser tubing designed to withstand supercritical steam and aggressive geothermal media.
Downhole injection tubes and subsea control umbilicals built for demanding high-salinity marine projects.
Precision high-pressure hydraulic lines designed to operate under severe vibration environments.
Liaocheng Sihe is a committed international partner, exporting high-performance coiled solutions to over 30 countries across the Americas, Europe, and the Asia-Pacific region. Standardized document flows, material test reports (MTRs), and compliance certifications accompany all shipments, meeting strict global import requirements.
As industrial operations face harsher working environments and rising regulatory standards, coiled tubing technology must evolve in step. Our long-term research and development initiatives focus on three primary pillars of metallurgical innovation:
With oil and gas extraction moving into deeper, higher-pressure offshore fields, we are expanding our production of super-duplex 2507 and high-nickel alloys to ensure tubing survives environments with elevated hydrogen sulfide (H2S) and carbon dioxide (CO2).
For ultra-high purity (UHP) gas delivery systems in semiconductor manufacturing and pharmaceutical bioreactors, we are optimizing drawing processes to achieve internal bore finishes under Ra 0.25µm.
Integrating advanced orbital laser welding with automated real-time NDT (Non-Destructive Testing) allows us to supply longer continuous lengths without compromising metallurgical uniformity.
2205 duplex options combining high structural limits and chloride corrosion resistance.
1/2" coiled tubing for industrial fluid distribution and instrumentation networks.
High-temperature oxidation resistant grade 310/310S for boiler structures.
Smooth internal surfaces optimized to prevent process contamination.
Micro-bore options designed for high-resolution chromatographic systems.
Long, seamless runs spooled on heavy-duty drums for ease of deployment.
High-strength alloy options configured for critical industrial pipelines.
High-thermal performance systems tailored for demanding marine conditions.
High-reliability hydraulic links designed for subsea completion systems.
Specialized grades tailored to meet customer-supplied parameters.
Grades configured to resist oxidation under elevated working temperatures.
Thick-walled tubing engineered for high pressure downhole applications.
Heavy industrial configurations engineered for processing and distribution plants.
Figure 2: Bright annealing furnaces and coil winding systems in our advanced workshop.
Review our full line of corrosion-resistant structural plates, specialty heat exchanger tubes, and heavy-wall welded pipes to complete your plant architecture.
