Sihe Steel
Sihe Steel
Engineered to meet stringent GB, ASTM, ASME, JIS, and EN production standards, offering unmatched durability and corrosion resistance.
In modern industrial fluid-handling systems, subsea applications, and high-pressure chemical dosing networks, stainless steel coiled tubing stands as a critical engineering asset. By offering long continuous runs, coiled tubing minimizes the risks associated with mechanical couplings, orbital welding joints, and manual fittings. This structural format significantly lowers leak-path probabilities, improves hydraulic integrity, and reduces installation cost.
For global EPC (Engineering, Procurement, and Construction) companies and industrial distributors, securing a reliable, cost-effective wholesale manufacturer is critical. Supply chain risks, fluctuating raw material surcharges (e.g., Nickel, Chromium, and Molybdenum LME indexes), and quality compliance certifications are central challenges.
Liaocheng Sihe Stainless Steel Material LTD addresses these market requirements by operating six state-of-the-art production lines capable of outputting ultra-long continuous coiled tubes. Our specialized manufacturing and quality testing processes ensure that all materials consistently withstand high pressures and aggressive, corrosive environments.
Sihe Steel Material provides precision engineering and strict quality compliance across all manufacturing sectors.
Understanding material compositions and grades is essential to choosing the right solution for specific corrosion profiles, temperature limits, and mechanical stress levels.
| Steel Type Group | Common Alloy Grades | Standards Compliance | Key Performance Indicators & Critical Use Cases |
|---|---|---|---|
| Austenitic Stainless Steel | 304/304L, 316/316L, 309S, 310S, 321, 317L | ASTM A269, ASTM A213, EN 10216-5 | Excellent ductility, weldability, and resistance to atmospheric corrosion. Standard choice for chemical processing, HVAC, and heat exchangers. |
| Duplex & Super Duplex | Duplex 2205, Super Duplex 2507 | ASTM A789, ASTM A790 | Double the yield strength of austenitic grades. Outstanding pitting resistance (PREN > 35 for 2205, > 40 for 2507). Ideal for subsea oil and gas, chloride-heavy environments. |
| Nickel Alloy Series | Incoloy 800, Incoloy 825, Inconel 625 | ASTM B163, ASTM B704, ASME SB704 | Exceptional resistance to stress corrosion cracking (SCC), reducing acids, and oxidizing media. Designed for deep-well downhole control lines and corrosive offshore umbilicals. |
When drafting procurement technical specifications, engineering teams must evaluate the **Pitting Resistance Equivalent Number (PREN)**. The formula:
PREN = %Cr + 3.3(%Mo + 0.5%W) + 16%N
determines a material's resistance to localized pitting in chloride-laden media.
While standard **316L** (PREN ~23-25) is adequate for mild industrial applications, offshore projects require **Duplex 2205** (PREN ~34-36) or **Incoloy 825** / **Inconel 625** to resist stress corrosion cracking and hydrogen embrittlement.
Sihe Steel provides custom-engineered tubing with outside diameters ranging from **0.125 inch (3.175 mm)** up to **1 inch (25.4 mm)**. Wall thickness specifications are supported up to **0.165 inch (3.0 mm)**. We offer precise control over mechanical properties, helping you match the appropriate pressure ratings and minimize system failure risks.
Our factory integrates advanced technology with strict inspection systems to ensure reliable material structural stability.
Cold drawing ensures tight dimensional tolerances and uniform wall thickness across long continuous tubing lengths.
Online bright annealing at 1050°C in a pure hydrogen atmosphere relieves mechanical stresses without causing surface oxidation.
Eddy-current and hydrostatic tests screen the entire length of the tube to identify potential micro-defects.
Comprehensive physical checks verify elasticity, structural integrity under load, and precise pressure thresholds.
Traditional annealing can leave scale and oxidation on the internal surface of long tubes. At **Liaocheng Sihe Stainless Steel Material LTD**, we employ an advanced inline bright annealing system utilizing high-purity hydrogen gas. This process eliminates oxygen exposure, ensuring the tube inner and outer diameters remain clean, smooth, and free of scale.
This smooth internal surface reduces fluid friction loss, minimizes turbulence, and prevents chemical deposits in capillary lines. To verify safety and product reliability, our testing facility performs compression, flaring, bending, tensile strength, air tightness, and 100% hardness tests.
Providing vital engineering components for advanced infrastructure, subsea resource extraction, and high-precision fluid instrumentation.
Subsea chemical injection and hydraulic control lines operating under high external pressures. Our continuous lengths of up to 10,000 meters reduce connection points and risk of failure in remote subsea locations.
Seamless coiled configurations offer optimized thermal transfer and high structural integrity. These components are designed to handle demanding steam pressures and corrosive cooling agents in power generation plants.
Ideal for chemical dosing and analyzer systems that route aggressive fluids and gases. Excellent pitting resistance prevents system corrosion and maintains fluid purity.
Every industrial application has specific dimensional limits and shape requirements. To support direct integration into your assembly lines, we provide:
Sihe Steel maintains ISO-compliant document tracing and quality certification records to meet demanding engineering specifications.
To ensure product quality and verify compliance with mechanical and chemical standards, we supply complete verification documentation for international orders. This documentation includes Certificates of Analysis (COA), Material Test Reports (MTR) according to EN 10204 3.1, Third-Party Inspection Reports (SGS, TUV, Lloyd's Register), and Certificate of Origin documents to simplify export and customs procedures.
We supply coiled stainless steel products customized for various commercial and industrial operating environments.
Optimized for efficient thermal transfer in heating, ventilation, and cooling systems.
Resistant to vibration-induced stress and high pressures associated with modern refrigerants.
Resistant to acids, organic solvents, and high-temperature processing media.
Sanitary-grade surface finishes designed to meet stringent food-contact regulations.
Electropolished ID capillaries that prevent residue accumulation and maintain product purity.
Designed to handle superheated steam and cycle water without critical degradation.
Sized for downhole injection and sampling lines in high-sulfur and marine environments.
High strength-to-weight ratios for hydraulic actuator lines and exhaust recirculation networks.
Essential technical and commercial information for purchasing departments and project engineers.
Browse through our specialized product categories designed to meet diverse industrial requirements.
Continuous length tubing for umbilical systems, downhole control, and instrumentation lines.
Micro-diameter tubing designed for medical devices, precision instruments, and chromatography.
Heat-resistant tubing optimized for boiler components and high-efficiency thermal exchangers.
Corrosion-resistant steel sheets available in various surface finishes and custom dimensions.
High-flexibility duplex and super duplex coils designed for offshore dynamic applications.
Heavy-wall industrial piping designed for chemical transport and structural applications.
Examine our specialized alloy products, precision polished tubing, and heavy industrial plates.
