Sihe Steel
Sihe Steel
Standard heat resistant alloy grade 1.4841/310 coil tube optimized for demanding chemical process piping.
Standard-compliant AISI 310 coiled tubing engineered with superb fatigue and cracking resistance.
BSI 310S24 specification seamless tubes tailored for offshore gas transport system environments.
High precision German DIN 17006 standard 310 stainless seamless coiled tube for hydraulic loops.
Standard GOST 20KH23N18 heat resistant specifications for heavy oil extraction applications.
UNS S31008 low carbon high temp coil pipe with excellent localized oxidation stability.
JIS SUS 310S standard bright annealed coiled pipes with superior corrosion characteristics.
Universal AISI 310 grade coiled tubes featuring dynamic resistance in reducing atmospheres.
In high-temperature industrial environments, standard structural materials suffer from rapid oxidation, mechanical scaling, and premature creep rupture. 310S stainless steel (UNS S31008 / 1.4845) represents a highly specialized austenitic alloy with a high-chromium (24-26%) and high-nickel (19-22%) composition. This high concentration of chromium ensures the instantaneous formation and continuous regeneration of a protective, self-healing chromium oxide (Cr₂O₃) surface layer at temperatures up to 1150°C (2102°F) under continuous operating conditions.
The "S" suffix in 310S designates the low-carbon variant of this alloy (Max 0.08% Carbon). The strategic reduction of carbon minimizes the precipitation of chromium carbides at grain boundaries in the critical temperature sensitization range (450°C to 850°C). This specific property is crucial for coiled tubes that undergo thermal cycles, preventing intergranular corrosion and assuring structural integrity across long installations (such as subsea umbilical systems and high-pressure steam distribution coils).
Exceptional resilience in air containing sulfur oxides or reducing combustion gases. Resists cyclic thermal shocking where standard grades like 304 or 316 fail through spalling.
The solid-solution matrix with elevated nickel levels stabilizes the austenite microstructure at elevated temperatures, providing higher creep-rupture performance than standard ferritic alloys.
Highly ductile matrix enables seamless drawing into miles-long continuous coils without weld seams. Eliminating transverse joints is key to leak-free systems in subsea and aerospace loops.
In modern petrochemical plants, geothermal power generation, and deepwater exploration, installation safety is heavily reliant on minimizing potential leak points. Traditionally, straight pipes welded together were the norm. Today, engineering houses require ultra-long continuous coiled tubing. Global procurement requirements focus on:
China's smart manufacturing transformation—commonly referred to as Industry 4.0—has reshaped how high-alloy pipes are produced. Factories like ours, Liaocheng Sihe Stainless Steel Material LTD, integrate precision metallurgical controls, real-time laser monitoring, and automated drawing systems to ensure dimensional compliance.
Our facility houses three specialized production lines for coiled tubing alongside six general production lines, producing seamless and polished stainless steel tubing, capillary tubes, and heat exchanger pipes. The core technology driving our success is the first-class bright annealing line. This system processes coiled tubing inline in a high-purity hydrogen environment. The process softens the metal structure for bending while preventing oxidation scaling, preserving a smooth, clean ID and OD.
Through rigorous quality assurance pipelines—including hydrostatic pressure testing, 100% tensile and hardness checks, flaring, and pneumatic air tightness validation—we meet international standards (GB, ASTM, ASME, JIS, EN) with zero non-conformances. Our streamlined logistics and stable raw material sourcing provide a reliable, cost-efficient supply chain that buffers against global market volatility.
We offer customized dimensional control and mechanical shaping parameters to match your specific engineering blueprints.
| Specification Param | Imperial Dimensions | Metric Equivalent | Custom & Tolerances |
|---|---|---|---|
| Outer Diameter (OD) | 0.125 inch to 1.00 inch | 3.175 mm to 25.4 mm | Tolerances down to ±0.05mm |
| Wall Thickness (WT) | Up to 0.165 inch | Up to 3.0 mm | Custom heavy wall profiles |
| Max Continuous Length | Up to 32,800 feet | Up to 10,000 meters | Continuous coil, no orbital welds |
| Alloy Grades Available | 304/304L, 316L, 321, 317L, 309S, 310S, INCOLOY 800, Duplex 2205, Super Duplex 2507, Incoloy 825, Inconel 625, and other exotic alloys. | ||
| Post-Forming / Processing | Laser cutting, hydraulic bending, spiral forming, mechanical flanging, end expansion, pneumatic and hardness testing. | ||
Precision sizing, custom wall thicknesses, and special coiling.
Continuous drawing, spiral forming, and protective atmosphere heat treatment.
Inline laser monitoring for flat cut-to-length segments.
High-grade stainless steel coils are critical components in primary energy transformation systems, fluid transport networks, and precision analytical processes.
Due to the extreme thermal gradients and chemical contaminants in refineries and steam boiler stations, heat exchange tubes must resist stress-corrosion cracking and localized pitting. Our 310S and 316L coiled tubes maintain highly efficient thermal conductivity under sustained cycles, minimizing micro-cracking propagation and downtime.
Precision hydraulic transmission systems in aircraft and military equipment require tubing that survives high vibration, friction, and thermal shock. Seamless coiled tubing provides the high yield strength required for fluid transport in high-heat engine chambers.
To ensure total reliability in heavy-industry engineering projects, Liaocheng Sihe is certified under major quality frameworks, facilitating international customs clearance and compliance.
Direct factory solutions for heat-resistant 310S coils designed for extreme operational parameters.
Ultra-fine capillary tube solutions with strict dimension specifications for micro-fluidic applications.
High thermal transmission efficiency cooling exchangers for chemical storage tanks.
Mechanical and electrochemical polished 316 tubes for semiconductor gas delivery lines.
Fully tested longitudinal welded 316L structural pipes for industrial waste line networks.
Marine grade AISI TP316 metal sheet and flat products for tank construction and marine tooling.
Polymer encapsulated 304 tubing for downhole control lines and physical protection loops.
Stabilized alloy 321 sheet optimized for high-temperature pressure vessel fabrication.