Sihe Steel
Sihe Steel
Explore our specialized range of high-performance stainless steel coiled tubing, heat exchanger pipes, and precision alloy tubes.
Global Manufacturing Authority
Established in China's industrial metallurgy hub, we operate six heavy-duty production lines with a dedicated specialization in high-precision coiled tubing, polishing pipes, and seamless alloy heat exchanger systems. For over a decade, we have supported mission-critical engineering pipelines across the globe.
By integrating advanced bright annealing technology online, we ensure exceptional mechanical performance, structural consistency, and oxidation-free inner surfaces. Our processes adhere to global industry standards: GB, ASTM, ASME, JIS, and EN.
Understanding the macroeconomic forces, metallurgy evolution, and market dynamics of high-performance piping.
Stainless Steel Grade 316L (UNS S31603) remains the cornerstone of modern heavy industry. By reducing carbon content to less than 0.03%, 316L effectively eliminates the risk of chromium carbide precipitation during welding (sensitization), ensuring superior intergranular corrosion resistance. This characteristic, combined with the additions of 2-3% Molybdenum, provides critical protection against pitting and crevice corrosion in harsh, chloride-bearing environments.
Today, the global market demands reliable, cost-efficient, and structurally sound piping products to support the growth of offshore wind, subsea extraction, hydrogen infrastructure, and next-generation biochemical processing. Liaocheng Sihe Stainless Steel Material LTD actively positions itself at the intersection of metallurgical refinement and advanced supply chain management. By exporting over 80% of our precision coil production to markets in North America, Germany, Spain, South America, and Southeast Asia, we maintain a strong global presence.
Offshore oil and gas operations are moving into deeper, high-pressure, high-temperature (HPHT) reservoirs. This requires robust control lines, chemical injection tubes, and umbilical assemblies capable of resisting marine pitting and stress corrosion cracking.
The manufacturing of microelectronics relies on Ultra-High Purity (UHP) gas delivery networks. Internally polished, electropolished (EP), and bright-annealed (BA) 316L tubes prevent particle shedding and contamination during process gas transport.
Pharmaceutical processes require clean, non-reactive systems. 316L, with its low carbon footprint and smooth inner surface finish, inhibits bacterial colonization and withstands aggressive Clean-in-Place (CIP) sterilization protocols.
Our commitment to material integrity and strict compliance with international mechanical codes.
To achieve high ductility, soft mechanical properties, and a mirror-like finish on our tubing, we employ state-of-the-art online induction bright annealing in a controlled pure hydrogen atmosphere. Unlike conventional annealing, this prevents surface oxidation, eliminating the need for acid pickling and preserving the tube's dimensional tolerances.
Furthermore, to ensure absolute reliability in field operations, our production center performs 100% non-destructive testing (NDT), including:
| Grade | Carbon (C) max | Manganese (Mn) max | Nickel (Ni) | Chromium (Cr) | Molybdenum (Mo) | Nitrogen (N) max |
|---|---|---|---|---|---|---|
| 304L (UNS S30403) | 0.030 | 2.000 | 8.00 - 12.00 | 18.00 - 20.00 | - | 0.10 |
| 316L (UNS S31603) | 0.030 | 2.000 | 10.00 - 14.00 | 16.00 - 18.00 | 2.00 - 3.00 | 0.10 |
| Duplex 2205 (UNS S32205) | 0.030 | 2.000 | 4.50 - 6.50 | 22.00 - 23.00 | 3.00 - 3.50 | 0.14 - 0.20 |
| Incoloy 825 (UNS N08825) | 0.050 | 1.000 | 38.00 - 46.00 | 19.50 - 23.50 | 2.50 - 3.50 | - (Ti: 0.6-1.2) |
Providing value-added fabrication services to fit complex engineering drawings and system assemblies.
We provide tailormade processing options for stainless steel coils, supporting multiple alloy materials (304, 316L, 2205) and custom outer diameters ranging from 6.35mm up to 19.05mm, keeping wall tolerances tight.
Our capabilities include precision coil bending, custom spiral forming, precise drawing, and structural coiling designed to fit space-restricted heat exchangers and complex heating/cooling units.
Equipped with laser cutting heads and mechanical straighteners, we deliver clean cuts with minimal edge distortion, preparing tubes for direct installation or automated welding setups.
We offer diverse finishes, including electropolishing, mechanical polishing, and bright annealing, to meet the strict roughness parameters (Ra) required for semiconductor and pharmaceutical cleanrooms.
Delivering high reliability in the world's most demanding environments.
High thermal efficiency and corrosion resilience under high pressure and temperature gradients.
Leak-proof coiled tubing designed for efficient refrigerant transfer and long service lives.
Resistant to sulfuric, phosphoric, and organic acids, preventing chemical contamination.
Hygiene-compliant surface finishes preventing biological buildup and ensuring easy cleaning.
Strict adherence to ultra-clean processing standards, minimizing batch contamination risks.
Durable condenser and superheater piping designed to withstand high pressure steam.
Providing durability against hydrogen attack and sulfide stress cracking (SSC).
Lightweight, thin-walled precision tubing with high mechanical strength limits.
Our certificates reflect our commitment to manufacturing precision and full traceablity.
Providing clear answers to technical, commercial, and logistical queries regarding our stainless steel products.
Our prices are subject to change depending on metal exchange market trends, raw material costs (Nickel, Molybdenum), and other macroeconomic factors. Once your team contacts us with your detailed requirements, we will send an updated price list and a formal quote.
Yes, we require all international orders to meet a minimum order quantity to maintain manufacturing efficiency on our six production lines. For special customized requests or trial samples, please contact our sales department to discuss options.
Yes, we supply complete traceablity and quality control documentation. This includes Mill Test Certificates (MTC) conforming to EN 10204 3.1, Certificates of Analysis (COA), Certificate of Conformance (COC), export shipping documentation, and Origin Certificates (Form E/Form F if required).
For items in stock or standard sample production, the lead time is about 7 days. For custom mass production orders, the typical lead time is 20-30 days after receiving deposit confirmation. Lead times begin once we receive the deposit and secure your final dimensional approvals.
We accept wire transfer (T/T), Western Union, and PayPal. Our standard terms are a 30% deposit in advance, with the remaining 70% balance paid against the copy of the Bill of Lading (B/L).
We stand behind our materials and workmanship. We guarantee compliance with specified dimensional tolerances and metallurgy codes (ASTM/ASME). If any manufacturing defects arise, our corporate policy ensures we address and resolve the issues to your satisfaction.
We utilize reinforced export packaging. Coiled pipes are securely wound on wooden or steel spools and wrapped with waterproof plastic barriers. Straight tubes are packed in heavy-duty wooden crates to prevent bending or surface scratching during maritime transport.
Premium cold-rolled sheets, specialty capillary tubes, and advanced duplex grades from our standard catalog.
Highly durable duplex stainless steel with mixed austenitic and ferritic microstructure.
Precision 1/2-inch outer diameter coiled tubing for chemical and marine umbilicals.
High-temperature oxidation-resistant 310 grade pipes for industrial furnaces and boiler zones.
