Sihe Steel
Sihe Steel
Explore our industrial-grade, certified stainless steel pipes and coiled tubes designed for heat exchangers, industrial boilers, and marine environments.
In modern industrial process engineering, thermal regulation and energy reclamation stand as structural pillars of economic efficiency. Choosing the right material for heat exchanger piping determines not only thermal performance but also the operational lifespan and safety profile of high-pressure systems. 316 stainless steel, enriched with 2% to 3% molybdenum, represents a premium solution designed for harsh industrial environments.
Standard austenitic grade 304 functions adequately in mild atmospheric conditions. However, when subjected to elevated temperatures, chloride concentration, or acidic mediums, it falls victim to rapid localized pitting and stress corrosion cracking (SCC). Grade 316 stainless steel significantly increases resistance to these mechanism-based failures. The addition of molybdenum raises the Pitting Resistance Equivalent Number (PREN) to approximately 23-25, providing a robust defensive barrier against chemical attacks.
“Choosing Grade 316/316L is not merely a material upgrade—it is a risk mitigation strategy. It prevents unscheduled factory shutdowns, mitigates contamination risks in high-purity sectors, and guarantees structural integrity under extreme thermomechanical stress.”
To help engineers and procurement specialists make data-driven decisions, we analyze key chemical elements and properties across different exchanger pipe alloys:
| Alloy Grade | UNS Designation | Nickel (Ni) % | Chromium (Cr) % | Molybdenum (Mo) % | Key Properties & Application Focus |
|---|---|---|---|---|---|
| 304 / 304L | S30400 / S30403 | 8.0 - 12.0 | 18.0 - 20.0 | - | Standard general-purpose usage. Economical but susceptible to chlorides. |
| 316 / 316L | S31600 / S31603 | 10.0 - 14.0 | 16.0 - 18.0 | 2.0 - 3.0 | Superior pitting resistance. Excellent for marine, chemical, and pharma. |
| 317L | S31703 | 11.0 - 15.0 | 18.0 - 20.0 | 3.0 - 4.0 | Enhanced creep resistance and tensile strength at high temperatures. |
| Duplex 2205 | S32205 | 4.5 - 6.5 | 22.0 - 23.0 | 3.0 - 3.5 | Dual-phase structure. High mechanical strength and resistance to SCC. |
| Inconel 625 | N06625 | 58.0 min | 20.0 - 23.0 | 8.0 - 10.0 | Extreme service. Exceptional strength and oxidation resistance at 980°C. |
How 316 stainless steel exchanger pipes drive performance and reliable operations across various key industrial landscapes.
Offshore oil extraction continues to push into deeper waters. Extreme subsea pressures and corrosive saline environments demand robust hydraulic lines. Our 316L coiled tubing, available in lengths up to 32,800 feet (10,000 meters) without orbital welds, minimizes potential leak paths, guaranteeing safe operations in subsea control lines.
Biotechnology and pharmaceutical synthesis demand strictly smooth surface finishes to prevent biological accumulation. Using bright-annealing technology, our 316 capillary tubes and heat exchanger pipes feature an ultra-smooth ID profile, minimizing cleaning overhead and avoiding chemical cross-contamination.
Refineries subject piping to volatile heat profiles and acidic media. The thermal expansion stability of ASTM A312/A269 Grade 316 pipes makes them ideal for processing crude oils, sour gases, and organic solvents. Molybdenum addition helps resist sulfurous and naphthenic acid attacks.
Operating out of China, Liaocheng Sihe Stainless Steel Material LTD is a key global exporter of high-precision stainless steel coiled tubing and heat exchanger pipes. With over ten years of specialized manufacturing history and multiple production lines, the enterprise satisfies international demand, exporting 80% of its coiled tubing capacity to more than 30 countries across the US, Germany, Spain, South America, Southeast Asia, the Middle East, and Eastern Europe.
Our facility stands out in the industry for utilizing state-of-the-art online bright annealing technology. Bright annealing (BA) involves heating the tubing in a controlled atmosphere containing hydrogen and nitrogen. This process softens the cold-worked stainless steel, restoring its ductility without allowing oxygen to form surface oxides, resulting in a clean, scale-free surface finish. Furthermore, the company performs rigorous quality assurance tests, including flaring, flattening, tensile, hardness, hydrostatic, and air tightness tests, ensuring complete compliance with ASTM, ASME, EN, GB, and JIS standards.
A leading expert in the production of high-quality stainless steel coiled tubes, polishing tubes, and seamless coiled tubing.
Liaocheng sihe stainless steel material LTD from China operates six state-of-the-art production lines. We manufacture high-quality sheet and pipe developments, establishing a leading position in stainless steel coiled tube, polishing tube, and seamless coiled tubing manufacturing.
Production is strictly aligned with international standards including GB, ASTM, ASME, JIS, and EN. We work with a broad spectrum of steel types: 304/304L, 316L, 321, 317L, 309S, 310S, and INCOLOY800, along with high-performance alloys like Austenitic steel 316L, Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625.
Our solutions are popular across a wide range of industries including military, semiconductor, pharmaceutical biotechnology, precision instruments, hydraulic parts, chemical industries, boilers, heat exchangers, aerospace, automotive, electronics, petroleum exploration, precision machinery, rail transportation, shipbuilding plants, air-conditioning, solar energy, and water heaters.
Coiled tubing is available in sizes ranging from outer diameter 0.125 inch (3.175 millimeters) to 1 inch (25.4 millimeters), with wall thicknesses up to 0.165 inch (3 millimeters). Continuous lengths up to 32,800 feet (10,000 meters) are available for cost-effective umbilical manufacturing. Customized sizes and specifications can also be manufactured to meet your project requirements.
As offshore oil and gas extraction moves into deeper and harsher environments where safety is paramount, our goal is to help you select the optimal corrosion-resistant materials for coiled umbilical tubing, maximizing safety and system reliability. We prioritize customer requirements and strive to satisfy every custom specification.
Providing precision post-processing options to ensure heat exchanger pipes integrate seamlessly into your assemblies.
We support various materials (e.g., 304, 316L, 2205) and custom specifications (diameters from 6.35mm to 19mm) for stainless steel coils.
Includes high-precision bending, spiral forming, and precision drawing, specifically optimized for thermal equipment fabrication.
Laser, mechanical, and flame cutting options provide clean cuts and accurate length tolerances.
Dedicated to refining surfaces with bright annealing, electro-polishing, and pickling options to minimize fluid drag and chemical scaling.
Providing reliable flange processing utilized in automotive exhaust systems, chemical pipelines, and precision instrument connections.
Our stainless steel tubes are utilized globally in critical applications that require high thermal efficiency and corrosion resistance.
In response to global calls for carbon neutrality and high industrial efficiency, Liaocheng Sihe is actively investing in research and development to drive the next generation of heat exchange materials. The transition from legacy fossil energy systems to green hydrogen processing and advanced geothermal heat extraction presents challenges. Traditional austenitic steel can experience hydrogen embrittlement under extreme hydrogen gas pressures. To solve this, our technical roadmap features three main development tracks:
Our quality assurance is verified by global third-party standards bodies. Inspect our certified production documentation.
Find quick answers to common questions about our products, customization options, and global shipping policies.
Browse our catalog of polished pipes, heat exchanger tubes, and capillary lines designed for high-performance thermal regulation systems.
