Sihe Steel
Sihe Steel
Explore our industrial range of seamless, welded, capillary, and standard dimension coils manufactured to global specifications.
Grade 304 stainless steel is the benchmark material in austenitic steel alloy technology. Combining a minimum content of 18% chromium and 8% nickel, 304 stainless steel coil tubing exhibits optimal resistance against localized corrosion, stress cracking, and atmospheric deterioration. As a premier Chinese manufacturer, Liaocheng Sihe Stainless Steel Material LTD leverages precise chemical balances to minimize carbon levels where necessary (transitioning to 304L to suppress chromium carbide precipitation during welding processes).
The physical mechanics of coiled tubing present a unique engineering challenge: the material must maintain elasticity during manufacturing, bending, and installation while maintaining substantial structural rigidity to resist internal hydrostatic and pneumatic pressures. The continuous metallurgical matrix of 304 steel offers tensile strengths exceeding 515 MPa and yield strengths up to 205 MPa, matching the rigorous requirements of subsea oil lines, chemical reactors, and semiconductor tooling.
By designing seamless coiled tubing with walls up to 3mm (0.165 inches) and outer diameters starting from 3.175mm (0.125 inches), we provide industries with highly dependable options for heat exchangers and hydraulic control lines.
One of the cornerstone advancements introduced by our factory is the world-class **Online Bright Annealing (BA)** process. Conventional furnace heat treatments inevitably result in surface oxidation, requiring additional pickling and polishing steps which can degrade precise dimensions.
Our online BA system operates in a strictly controlled, oxygen-free hydrogen/nitrogen shielding atmosphere. By heating the tubing continuously to temperatures above 1040°C followed by rapid cooling, we dissolve chromium carbides back into the austenitic solid-solution matrix. This results in:
To complement this metallurgy, every meter of our coil tubing undergoes strict testing, including 100% pneumatic testing, flaring and flattening checks, and hardness testing to verify material integrity.
Liaocheng Sihe Stainless Steel Material LTD operates 6 production lines with state-of-the-art processing services to deliver tailored steel solutions.
Supports various materials (e.g., 304, 304L, 316L, 2205) and custom specifications with outer diameters ranging from 6.35mm to 19mm.
Includes high-precision bending, spiral forming, and precision drawing, optimized for heat exchangers and umbilical applications.
Utilizes laser and mechanical cutting to deliver precise tolerances and clean, burr-free tube ends.
Applies state-of-the-art technologies to offer bright annealing, electro-polishing, and chemical passivation.
Provides robust flanged connections for automotive exhaust systems, chemical pipelines, and instrument lines.
Modern procurement teams in the US, Germany, Spain, and Southeast Asia face complex engineering, regulatory, and logistics requirements. High-stakes applications like subsea umbilicals and heat exchangers require materials that can withstand aggressive pitting, crevice corrosion, and environmental stress cracking.
To address these concerns, Liaocheng Sihe utilizes a structured Quality Management System. We offer full material traceability and verify conformance with standards such as ASTM A269, ASTM A213, EN 10216-5, and JIS G3459. Our coiled tubing is packaged for export using custom heavy-duty steel or wooden reels, ensuring clean delivery and ready integration with automated spooling machinery.
Whether you require standard 304 coiled tubing, high-temperature 310S, or duplex alloys like 2205 and Incoloy 825, we coordinate direct, certified shipping that optimizes landing costs while keeping projects on schedule.
Our stainless steel coiled tubing is engineered to handle extreme conditions in major industries worldwide.
Explore our core business segments including heat exchanger tubes, sheets, and capillary lines.
High-yield duplex stainless steel designed for demanding, corrosive environments.
1/2" coiled stainless steel tubing designed for fluid and gas distribution networks.
Excellent high-temperature scaling resistance for furnace lines and petrochemical heaters.
Understanding the future of high-precision fluid transmission and metallurgical design.
Optimizing trace elements like nitrogen, titanium, and niobium to improve strength and grain structure without compromising ductility.
Using real-time eddy current and ultrasonic testing on the production line to detect internal defects and guarantee consistent quality.
Developing continuous extrusion and drawing lines capable of producing single, weld-free coils up to 10,000 meters long to eliminate assembly risks.
Liaocheng Sihe ensures all products meet international engineering standards for critical installations.
Get answers to common questions about specifications, technical requirements, and global distribution.
Complete selection of precision tubing for instrumentation, control lines, and industrial manufacturing.
