Sihe Steel
Sihe Steel
Explore our core range of heavy-duty, high-temperature stainless steel plates, sheets, and coiled tubing systems.
Ultra-smooth mirror-finish #8 polished sheets offering supreme weldability and corrosion protection under cyclic thermal stress.
High-grade titanium-stabilized austenitic stainless alloy sheet engineered strictly for structural and thermal applications.
Precision-sized cold-rolled AISI 321 sheets, ideal for deep drawing, stamping, and manufacturing custom heating elements.
Continuous length coiled tubing systems optimized for subsea pipelines, hydraulic systems, and processing operations.
Engineered for boilers, superheaters, and heat exchangers. Highly resistant to intergranular cracking under dynamic pressures.
Strictly manufactured under international tolerances to guarantee flawless integration into instrumentation assemblies.
Seamless design eliminating weak weld zones, providing robust gas and fluid routing capabilities in oilfields.
Durable, structurally sound polished pipelines catering to architectural and automotive exhaust requirements.
Grade 321 (UNS S32100) is an austenitic stainless steel stabilized with titanium. The primary advantage of 321 is its excellent resistance to intergranular corrosion following exposure to high temperatures in the chromium carbide precipitation range from 800°F to 1500°F (427°C to 816°C). Unlike standard 304, the addition of titanium binds with carbon to form titanium carbides, which are far more stable than chromium carbides. This critical metallurgical reaction preserves the chromium matrix near grain boundaries, preventing localized galvanic attack and structural degradation.
"By introducing titanium at a ratio of at least 5 times the carbon content, AISI 321 provides superior creep strength, stress rupture limits, and mechanical durability compared to Grades 304 and 304L."
Additionally, Grade 321 displays outstanding resistance to oxidation up to 1500°F (816°C) under cyclic conditions. Its high-temperature mechanical properties remain stable, making it the preferred choice for thermal processing, exhaust systems, and high-pressure boiler structures globally.
| Chemical Component | AISI 321 (Wt %) | AISI 304 (Wt %) |
|---|---|---|
| Carbon (C) | 0.08 max | 0.08 max |
| Chromium (Cr) | 17.00 - 19.00 | 18.00 - 20.00 |
| Nickel (Ni) | 9.00 - 12.00 | 8.00 - 10.50 |
| Titanium (Ti) | 5x(C+N) min - 0.70 max | N/A |
| Manganese (Mn) | 2.00 max | 2.00 max |
| Silicon (Si) | 0.75 max | 0.75 max |
Why modern engineering projects rely heavily on Grade 321 and how supply networks are adapting.
Geopolitical challenges and trade rebalancing have forced global procurement directors to prioritize supply chain resilience. Manufacturers require suppliers who not only comply with ASTM A240 and ASME SA240 but also offer robust raw material validation. With nickel and titanium markets showing high price volatility, sourcing 321 Stainless Steel from reliable mills with long-term material hedging strategies is vital for cost predictability and avoiding delay risks.
From deep-sea hydrocarbon wells requiring umbilical lines to high-altitude rocket thruster components, 321 Stainless Steel provides critical margins of safety. Because the material maintains its mechanical properties and resists scaling under cyclical temperatures, industrial systems face fewer unplanned outages, reducing life-cycle costs and avoiding environmental hazards in demanding petrochemical and aerospace environments.
Liaocheng Sihe Stainless Steel Material LTD has integrated advanced digital manufacturing technologies to meet the dynamic needs of global buyers. Our production lines use automation for real-time laser gauging, thickness control, and temperature regulation. This ensures consistent tolerances across sheets, plates, and coiled tubing.
Our online bright annealing technology represents a major step forward, performing online steel softening under controlled hydrogen atmospheres. This prevents surface scaling and removes the need for acid pickling, producing an ultra-clean, uniform, and reflective surface finish. Additionally, automated testing for tension, flaring, compression, and hydrostatic performance provides 100% reliability for critical applications.
Strict Quality Assurance Standards: All processes adhere strictly to GB, ASTM, ASME, JIS, and EN specifications. Digital tracking monitors the raw material melt batch, ensuring complete traceability from core ingot production through processing, packaging, and final ocean shipping.
A trusted manufacturing partner delivering high-performance steel alloys worldwide.
Liaocheng sihe stainless steel material LTD is a premier manufacturer specializing in high-performance stainless steel coiled tubing, seamless tubing, and polished pipes. With six advanced production lines and over a decade of processing experience, we serve customers in over 30 countries, including the US, Germany, Spain, South America, Southeast Asia, the Middle East, and Eastern Europe.
We work with a wide range of materials, from austenitic steels (304/304L, 316L, 321, 317L, 309S, 310S, INCOLOY 800) to Duplex (2205), Super Duplex (2507), Incoloy (825), and Inconel (625). Our coiled tubing is available in outer diameters ranging from 0.125 inches (3.175 mm) to 1 inch (25.4 mm), with wall thicknesses up to 0.165 inches (3 mm) and continuous lengths up to 32,800 feet (10,000 meters). These continuous coils are highly efficient for subsea umbilical manufacturing and deep-sea oil and gas projects.
Our commitment to quality is backed by comprehensive in-house testing facilities. We conduct 100% hydrostatic testing, pneumatic testing, mechanical property testing, flaring and flattening assessments, and hardness verification. Our advanced online bright annealing technology allows us to heat-treat materials efficiently, maintaining clean finishes and excellent ductility.
Our manufacturing facility operates under international quality management systems to guarantee reliability.
Tailoring raw steel alloys into high-precision, installation-ready system components.
We work with various materials (304, 316L, 2205) and custom specifications, covering tubing diameters from 6.35 mm to 19 mm.
Our capabilities include custom bending, high-density spiral forming, and precision drawing, designed to meet strict heat exchanger requirements.
We provide laser, mechanical, and flame cutting services to deliver precise lengths and minimize material waste.
Our advanced finishing options include bright annealing, mechanical polishing, and pickling to achieve excellent corrosion resistance.
We manufacture flanged joints and flared tubing ends for automotive exhaust pipes, chemical systems, and precision instrument lines.
Our stainless steel sheets, plates, and coiled tubing are designed for critical industrial sectors.
High-quality structural coils, tubing, and plates designed for severe operating environments.
Available in grades like Duplex 2205. Contains a balanced austenitic-ferritic microstructure to provide excellent mechanical properties and resistance to stress corrosion cracking.
We supply 1/2-inch stainless steel coiled tubing in continuous coils, ideal for high-pressure fluid transfer and analytical systems.
Manufactured to withstand severe high-temperature oxidation. Suitable for industrial furnace parts and thermal treatment equipment.
Find answers to common questions about our products, technical specifications, and shipping details.
Explore our full range of specialty alloy sheets, plates, and coiled tubing options.
Versatile, high-strength cold-rolled sheets suitable for food processing, storage tanks, and architectural fixtures.
Food-grade sanitary finish tube coils designed for optimal heat exchange and clean beverage dispensing systems.
Highly alloyed material providing superior resistance to warm chloride solutions and pitting in maritime environments.
Nickel-chromium-molybdenum alloy designed for high-strength applications under severe heat and acid exposure.
Low-carbon molybdenum-bearing alloy designed to resist marine corrosion and pitting in petrochemical systems.
Cost-effective structural tubing option, ideal for automotive exhaust systems and structural frameworks.
High-precision hydraulic tubing offering excellent pressure ratings and corrosion resistance for marine systems.
Precision micro-diameter tubing designed for laboratory instrumentation, sensors, and medical devices.