Sihe Steel
Sihe Steel
High-precision stainless steel coiled tubes manufactured to strict ASTM, ASME, JIS, and EN standards. Engineered for severe hydraulic, offshore umbilical, and high-temp heat transfer operations.
As a global leader in high-performance metallurgy, Liaocheng sihe stainless steel material LTD is dedicated to the engineering and delivery of premium stainless steel coiled tubing. We specialize in producing seamless coiled tubing, bright annealed control lines, and capillary tubes conforming precisely to GB, ASTM, ASME, JIS, and EN standards.
Through our six integrated manufacturing lines, we utilize advanced metallurgy processing to work with elite steel grades, including standard Austenitic steels like 304/304L, 316L, 321, 317L, 309S, 310S, and INCOLOY 800. For extreme environments demanding superior corrosion resistance and high-yield strength, we manufacture high-alloy solutions such as Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625.
Whether it is offshore subsea umbilicals, analytical instrumentation control loops, or advanced heat exchangers, we match the exact chemistry, mechanical limits, and outer dimensional consistency required by global procurement directors.
ASTM A269 covers nominal-wall-thickness, seamless and welded austenitic steel tubing for general corrosive service and low- or high-temperature service. Here is the technical composition and dimension matrix.
Our coiled tubing solutions are offered across a wide dimensional matrix, allowing engineers to minimize field joints and potential leakage zones.
| Material Grade | UNS Number | Tensile Strength (Min, MPa) | Yield Strength (Min, MPa) | Main Applications |
|---|---|---|---|---|
| 304/304L | S30400 / S30403 | 485 | 170 | Beer Cooling Coils, Food & Beverage, Heat Exchangers | }
| 316/316L | S31600 / S31603 | 485 | 170 | Chemical Processing, Offshore Hydraulic lines, Umbilicals |
| Duplex 2205 | S32205 | 655 | 450 | Deepwater Well Control, Subsea Gas Injection, Desalination |
| Incoloy 825 | N08825 | 585 | 240 | Sour Gas Wells, Chemical Reactor Heating Coils |
| Inconel 625 | N06625 | 827 | 414 | Extreme Corrosive Environments, Aerospace, Marine Hardware |
Sourcing coiled tubing from a premier Chinese manufacturer like Liaocheng Sihe Stainless Steel Material LTD delivers key strategic benefits for global infrastructure pipelines.
We feature world-first-class online bright annealing systems that apply heat treatment under a high-purity hydrogen shielding atmosphere. This prevents surface oxidation, improves grain structural consistency, and ensures the interior tube walls remain free of micro-cracks or scale.
Our quality verification processes include hydrostatic, compressed air, and flaring testing alongside specialized eddy current inspection. We guarantee 100% tensile verification, hardness validation, and air tightness testing to verify zero weld seam failures under extreme subsea operational stresses.
With custom packaging designs including high-stability wooden drums, steel-framed spools, and sea-freight optimized export loading protocols, we supply projects globally, ensuring undamaged delivery of coiled control lines up to 32,800 feet per spool.
Our ASTM A269 coiled tubes are critical across various high-value processing environments. Below are the industries where our metallurgy delivers the longest lifespans.
Offshore Deepwater Extraction: As more oil and gas extraction processes transition to deep and ultra-deep waters, the extreme temperatures and pressures of subsea environments require high corrosion resistance. We specialize in producing coiled umbilical tubes that maintain high structural integrity against pitting, crevice corrosion, and stress corrosion cracking (SCC) caused by high hydrogen sulfide and chloride concentrations.
Semiconductor Gas Lines & Pharmaceutical Systems: High-purity process lines require tubes with extremely smooth inner surfaces to prevent particulate entrapment and microbiological growth. Our bright annealed and inner-diameter polished ASTM A269 tubes meet the strict surface quality requirements of biotechnology laboratories and cleanrooms.
We provide value-added custom post-processing, allowing you to integrate finished tube assemblies directly into your system assemblies.
We provide precision bending and spiral forming for heat exchangers and refrigeration equipment. Supporting materials like 304, 316L, and Duplex 2205, we work with diameters from 6.35 mm to 19 mm to match tight dimensional envelopes.
Utilizing high-speed laser and advanced mechanical cutting lines, we provide precise pipe sections. Our process ensures clean, burr-free ends, ready for clean orbital welding and connection assembly.
Our flanging and end-forming services are designed for automotive exhaust manifolds, chemical pipelines, and precision instrumentation connectors, eliminating the need for separate weld flanges.
Explore our diversified product portfolio. We support a range of configurations, grades, and sizes tailored for severe service applications.
Manufactured from premium Duplex 2205 and austenitic grades. Offers high resistance to corrosion and micro-cracking in dynamic pressure environments.
1/2 inch and standard imperial sizes available in coils for marine umbilical cables, chemical plants, and hydraulic control loops.
Specifically designed for high-temperature oxidation environments including waste gas incinerators and thermal processing furnaces.
Our manufacturing processes are verified to global standards, including certifications for oil & gas, chemical processing, and marine applications.
Get authoritative answers on metallurgical certifications, order minimums, delivery times, and customization options.
Review our full range of structural sheets, heat exchanger pipes, and high-alloy tubing options available for global export.
