Sihe Steel
Sihe Steel
Pioneering standard-compliant, high-corrosion-resistant alloy and stainless steel seamless tubing configured for industrial operations.
Superior oxidation resistance and high temperature stability, suitable for furnace components and exhaust systems.
Get Price Quote
Highly versatile, anti-corrosive stainless coiled tubes engineered for hydraulic systems, fluid control, and gas transport.
Check Pricelist
High mechanical strength combined with outstanding resistance to chloride-induced stress corrosion cracking.
View Details
Superalloy tubing for extreme high-temperature and severe marine chemical conditions.
Inquire Now
Extra-low carbon alloy to mitigate carbide precipitation. Seamless construction allows long continuous lengths.
Factory Price
Ferritic stainless steel offering good thermal and corrosion resistance for automotive exhaust systems.
Get Quotes
Ultra-smooth inner surface and tightly controlled tolerances for critical processing operations.
Contact Supplier
Higher chromium, nickel, and molybdenum content than 316L for maximum pitting resistance in chemical media.
Get Free Quote
Established as a global pioneer in China’s metallurgy industry, Liaocheng Sihe Stainless Steel Material LTD operates six state-of-the-art production lines specializing in high-performance seamless coiled tubing, polishing tubes, and heat exchanger pipes. We execute manufacturing protocols in strict compliance with GB, ASTM, ASME, JIS, and EN standards to satisfy the safety-critical requirements of modern industries.
Our metallurgy expertise covers mainstream and high-alloy formulations: 304/304L, 316L, 321, 317L, 309S, 310S, and Incoloy 800. Through heavy R&D investments, we supply leading contractors in the aerospace, military, pharmaceutical, semiconductor, and subsea oil & gas sectors across the US, Germany, Spain, South America, Southeast Asia, and Eastern Europe.
“We introduced the world’s first-class bright annealing technology, enabling online stainless steel softening treatment. Today, 80% of our precision coils are exported to critical global engineering projects.”
Why the low-carbon variant of 18-8 stainless steel is the benchmark for critical fluid handling systems.
TP304L (UNS S30403) represents the ultra-low carbon variant of the classical TP304 austenitic stainless steel grade. Standard TP304 contains a maximum of 0.08% carbon, whereas TP304L restricts carbon content to 0.03% or lower. This subtle difference is critical for welding applications.
During welding procedures, temperatures between 425°C and 860°C (797°F to 1580°F) cause chromium and carbon to react, leading to chromium carbide precipitation along grain boundaries. This zone, depleted of chromium, becomes highly vulnerable to intergranular corrosion (IGC). By maintaining carbon under 0.03%, TP304L prevents carbide formation, preserving corrosion resistance in the heat-affected zone (HAZ) of welded structures.
| Chemical Composition (%) | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) | Chromium (Cr) | Nickel (Ni) | Nitrogen (N) |
|---|---|---|---|---|---|---|---|---|
| TP304L Standard | ≤ 0.030 | ≤ 2.00 | ≤ 0.045 | ≤ 0.030 | ≤ 0.75 | 18.0 - 20.0 | 8.0 - 12.0 | ≤ 0.10 |
| Liaocheng Sihe Premium Range | ≤ 0.024 | 1.85 | 0.032 | 0.005 | 0.55 | 18.5 | 9.5 | 0.07 |
Calculated PREN values verify optimal resilience to chloride-induced localized attack, keeping installations safe in saline or humid atmospheres.
Cold-drawn calibration delivers wall thickness tolerances down to ±0.05mm, satisfying semiconductor gas delivery requirements.
Engineered for high heat exchange efficiency, minimizing surface fouling in boiler condensers and solar thermal circuits.
We deploy custom-engineered stainless steel and super alloy pipes to optimize safety and system life across critical sectors.
Deeper offshore exploration demands corrosion-resistant materials for coiled umbilical tubes. Our seamless coils survive deep-sea pressures, preventing chemical leaks in offshore hydraulic circuits.
Our internally polished electropolished-ready (EP) pipes prevent gas entrapment and particle generation, essential for maintaining sub-nanometer cleanroom conditions in wafer fabrication plants.
Supplying high-strength, lightweight hydraulic lines designed to manage heavy vibration and high thermal dynamics in engine compartments and fuel distribution lines.
Our production facilities customize sizes ranging from an outer diameter of 0.125 inches (3.175 mm) to 1 inch (25.4 mm), with wall thicknesses up to 0.165 inches (3 mm). To facilitate umbilical manufacturing and subsea chemical injection lines, we produce continuous coil configurations up to 32,800 feet (10,000 meters) without orbital butt welds.
By using premium raw materials—including Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625—our engineering team ensures that every pipeline system matches its specific installation environment. This prevents corrosion and extends operational lifetimes.
Flexible fabrication capabilities aligned with high-performance manufacturing standards.
Supports various materials (e.g., 304, 316L, 2205) and specifications (diameter 6.35mm to 19mm) for stainless steel coils. Standardized tolerances and precise cold drawing techniques are guaranteed.
Includes bending, spiral forming, precision drawing, and other processes tailored for high-efficiency heat exchangers and specialized evaporator units.
Laser cutting, mechanical cutting, or flame cutting for high-precision and efficient material processing, ensuring error-free installation on-site.
We devote ourselves to developing new products with state-of-the-art technologies, including bright annealing, chemical pickling, mechanical polishing, and passivation.
Used in automotive exhaust systems, chemical pipelines, and precision instrument connections, providing leak-proof joints under heavy pressure loads.
Every millimeter is tested using advanced methods to guarantee performance under high pressures and in corrosive environments.
Our quality control program conducts rigorous destructive and non-destructive testing (NDT) to prevent pipe failure in high-pressure oil lines or cleanrooms. 100% of our products undergo online inspections, checking physical structures, dimensional consistency, and raw material purity.
Primary Testing Protocols:
Technical and logistics questions answered by our metallurgy and manufacturing experts.
Select from our complete range of specialized industrial tubing, capillary lines, and plate steel products.
2205 duplex stainless steel containing austenitic and ferritic phases for high-stress subsea installations.
View Products
1/2 stainless steel coiled tubing refers to a coil of stainless steel tubing designed for high-efficiency hydraulic routing.
View Products
High-temperature heat exchanger coil solutions designed for high-heat manufacturing operations.
View Products
Alternative alloy profiles and special specification tubes designed for industrial projects.
Highly smooth inner diameter designed to prevent fluid deposition, ideal for chemical processing systems.
Inquire Factory
Extremely high mechanical strength and corrosion resistance for deep-sea oil extraction control lines.
Get Quotations
Industrial grade 316L welded pipelines designed for marine systems, municipal water distribution, and sewage piping.
Request Sample
Thermal stability and oxidation resistance, optimized for automotive and diesel motor exhaust configurations.
Check Pricelist
Economic alternative for lower-corrosion environments. Perfect for decorative architectural handrails.
Find Supplier
Premium superalloy coil designed to withstand high pressure and severe corrosion in sour oil wells.
Inquire Directly
High thermal transmission efficiency and structural integrity, optimized for condenser installations.
Factory Price
Small-bore precision tube engineered for instrumentation systems, sensors, and medical gas delivery.
Get Quotes