Sihe Steel
Sihe Steel
Discover our primary selection of corrosion-resistant, high-temperature heat exchanger pipes and coiled tubes engineered to meet stringent GB, ASTM, ASME, JIS, and EN standards.
An authoritative analysis of thermodynamic characteristics, corrosion resistance vectors, and structural mechanical performance in ultra-tough environments.
When designing heat exchangers, shell-and-tube configurations, or condensers, material selection is the single most critical factor dictating long-term reliability and thermal transfer rates. ASTM A269 and ASTM A312 Grade TP304 austenitic stainless steel serves as the benchmark alloy for general-purpose corrosion resistance and exceptional thermal dynamics.
Consisting of 18% chromium and 8% nickel, Grade 304 offers structural stability under high operating pressures, resistance to oxidation up to 870°C, and robust mechanical workability. For critical deepwater offshore operations, semiconductor processing, and biotechnology pipelines, we also manufacture advanced variants such as 304L (Low Carbon) to mitigate sensitization during welding, alongside high-alloy steels like Duplex 2205, Super Duplex 2507, and nickel-base superalloys including Incoloy 825 and Inconel 625.
Our manufacturing processes leverage bright annealing technology. Conducted in a controlled hydrogen/nitrogen atmosphere, this online softening treatment eliminates surface scaling, minimizes micro-roughness (essential for preventing bio-fouling and fluid drag), and retains high structural ductility without requiring secondary mechanical pickling.
| Alloy Grade | UNS Designation | Cr (%) | Ni (%) | Mo (%) | Tensile Strength (MPa min) | Yield Strength (MPa min) | Max Temp (°C) |
|---|---|---|---|---|---|---|---|
| TP304 / 304L | S30400 / S30403 | 18.0 - 20.0 | 8.0 - 10.5 | - | 515 / 485 | 205 / 170 | 800 |
| TP316L | S31603 | 16.0 - 18.0 | 10.0 - 14.0 | 2.0 - 3.0 | 485 | 170 | 850 |
| Duplex 2205 | S31803 / S32205 | 22.0 - 23.0 | 4.5 - 6.5 | 3.0 - 3.5 | 620 | 450 | 300 (Chloride limit) |
| Super Duplex 2507 | S32750 | 24.0 - 26.0 | 6.0 - 8.0 | 3.0 - 5.0 | 795 | 550 | 310 (Chloride limit) |
| Incoloy 825 | N08825 | 19.5 - 23.5 | 38.0 - 46.0 | 2.5 - 3.5 | 586 | 241 | 540 |
| Inconel 625 | N06625 | 20.0 - 23.0 | 58.0 min | 8.0 - 10.0 | 827 | 414 | 980 |
Over a decade of manufacturing leadership, executing rigorous international QA metrics, and operating six specialized high-speed production lines.
Established as a key manufacturer of precision stainless steel coiled tubing and heat exchanger pipes, Liaocheng Sihe Stainless Steel Material Ltd operates six production lines dedicated to manufacturing seamless coiled tubing, capillaries, and ultra-long structural pipes.
With an export profile where over 80% of our production volume is delivered to mature markets in North America, Germany, Spain, South America, and Southeast Asia, we maintain strict adherence to GB, ASTM, ASME, JIS, and EN production standards.
Our factory integrates end-to-end quality assurance mechanisms on-site. Every heat exchanger pipe undergoes a battery of destructive and non-destructive evaluations, including:
Value-added manufacturing services tailored to specific dimensional limits and heat-exchanger design parameters.
We support various materials (including 304/304L, 316L, and 2205) and custom specifications, covering diameters from 6.35mm to 19mm for stainless steel coils. Standard sizes range from outer diameter 0.125 inch (3.175 mm) to 1 inch (25.4 mm), with wall thickness up to 0.165 inch (3 mm).
We offer extensive secondary fabrication techniques, including precision bending, spiral forming, drawing, and custom coiling specifically optimized to increase surface area in limited-envelope heat exchange units.
High-accuracy laser cutting, mechanical abrasive cutting, and automated straightening systems ensure tight tolerances for quick drop-in placement on shell-and-tube tubesheets.
We specialize in electro-polishing, chemical passivation, and mechanical polishing to reduce micro-cracks, prevent fluid turbulence, and eliminate the potential for pitting initiation in severe environments.
Precision flanged ends enable reliable mechanical joining without welding, frequently used in automotive exhaust systems, chemical pipelines, and high-vibration precision instrument interfaces.
Our mills actively process: 304/304L, 316L, 321, 317L, 309S, 310S, and INCOLOY 800. Custom chemistry specifications can be arranged upon technical evaluation.
From subsea oil extraction to clean-room biotechnology, our heat exchanger piping conforms to high regulatory demands.
Heat Exchangers & Condensers
Refrigeration & HVAC Systems
Chemical Processing Plants
Food & Beverage Processing
Pharmaceutical & Biotech
Power Plants & Energy Systems
Petrochemical Engineering
Automotive & Aerospace
Decarbonization, severe service alloys, and micro-channel thermal engineering transitions.
As process engineering demands shift toward higher temperatures and pressures, heat exchanger design is undergoing rapid transformation. At Liaocheng Sihe Stainless Steel, our development roadmap is aligned with three core industry transitions:
We are actively integrating closed-loop energy systems within our bright annealing furnaces, reducing emissions and power consumption by 18%. This allows us to supply green-certified steel pipes to environmental and carbon-conscious global projects.
Verified compliance under international inspection systems to ensure risk-free commissioning.
Technical and logistics answers for procurement managers, structural engineers, and design firms.
Our prices are subject to change depending on material raw index rates (LME), shipping logistics, and other market factors. We will send you an updated price list after your company contacts us for further detailed information.
Yes, we require all international orders to have an ongoing minimum order quantity. If you are looking to resell or procure in much smaller, non-standard quantities, we recommend you check out our retail division or contact our representative to match current runs.
Absolutely. We provide comprehensive documentation packages including Certificate of Analysis / Conformance (MTC EN 10204 3.1/3.2), Marine Insurance documentation, Certificates of Origin, and export documentation custom-tailored to regional custom requirements.
For standard samples, the lead time is approximately 7 days. For mass production of heat exchanger tubes, lead times range between 20-30 days upon receiving deposit payment. Lead times become effective when we have received your deposit and final specifications sign-off.
We accept standard corporate bank wire transfers (T/T), L/C at sight, Western Union, and PayPal. Our typical billing structure is a 30% deposit in advance, with the remaining 70% balance settled against a copy of the Bill of Lading (B/L).
We offer structural warranties on our metallurgical compositions and processing workmanship. It is our company policy to address and resolve all material and performance issues to complete customer satisfaction, inside or outside of standard warranty terms.
Yes. We design and employ heavy-duty export packaging, including reinforced wooden frames, heat-shrunk anti-oxidation coatings, and customized structural cradles to prevent tube deformation during sea transit.
Shipping costs depend on the delivery terms chosen (FOB, CIF, CFR, DDP). Standard sea freight is highly recommended for large volumes, while express delivery or air freight can be used for custom capillary prototypes. Contact our logistics desk for real-time freight cost estimates.
Seamless custom configurations for unique pressure and fluid dynamics environments.
Duplex 2205 is a nitrogen-enhanced duplex stainless steel developed to combat stress-corrosion cracking.
Learn More
1/2-inch stainless steel coiled tubing refers to high-pressure design coils for instrumentation lines.
Learn More
Designed to tolerate extreme thermal shifts within high-temperature processing chambers.
Learn More
Extended engineering portfolio containing precision polishing tubes, structural plates, and high-temp alloy piping.
