Sihe Steel
Sihe Steel
Direct supply paths from verified domestic manufacturing plants to meet strict industrial dimensions.
In modern industrial engineering, materials serve as the foundation of progress. SUS 304 stainless steel tubing stands as a primary structural element across a broad range of sectors, including petrochemical refining, precision pharmaceutical fluid transport, and automotive exhaust systems. Characterized by its versatile austenitic microstructure, SUS 304 balances corrosion resistance, mechanical strength, and cold-forming capabilities. As heavy industries move toward harsher operating environments and more demanding quality standards, understanding the technical characteristics and market dynamics of SUS 304 has become a priority for procurement directors, materials engineers, and plant managers worldwide.
The performance of SUS 304 stems from its chemical composition. It is categorized under the standard 18-8 steel class, featuring a minimum of 18% Chromium and 8% Nickel. Chromium establishes a passive chromium oxide (Cr₂O₃) layer on the metal surface, which self-heals in atmospheric environments and shields the underlying substrate from oxidation. Nickel maintains the austenitic structure, enabling high toughness and ductility even at sub-zero cryogenic temperatures.
| Chemical Elements | Chromium (Cr) | Nickel (Ni) | Carbon (C) | Manganese (Mn) | Silicon (Si) | Phosphorus (P) | Sulfur (S) |
|---|---|---|---|---|---|---|---|
| SUS 304 Standard (%) | 18.00 - 20.00 | 8.00 - 10.50 | ≤ 0.08 | ≤ 2.00 | ≤ 0.75 | ≤ 0.045 | ≤ 0.030 |
| SUS 304L (Low Carbon) | 18.00 - 20.00 | 9.00 - 13.00 | ≤ 0.03 | ≤ 2.00 | ≤ 0.75 | ≤ 0.045 | ≤ 0.030 |
For high-temperature heat exchangers or subsea control units, minimizing carbide precipitation during welding is essential. In these situations, low-carbon variants like SUS 304L or titanium-stabilized grades such as ASTM 321 are used to prevent intergranular corrosion. This ensures structural integrity when operating in temperatures ranging from 425°C to 800°C.
The global trade of SUS 304 stainless steel tubing is shaped by raw material prices (specifically LME Nickel and Ferrochrome), energy costs, and infrastructure development. Manufacturing has shifted toward specialized production plants with integrated supply chains. Liaocheng Sihe Stainless Steel Material LTD and other Chinese manufacturers play a central role in B2B supply, leveraging advanced processing technology and local raw material availability to meet global commercial demand.
Procurement departments are moving away from spot transactions toward long-term framework contracts. This strategy aims to secure price stability and reliable shipping schedules. B2B buyers require detailed metallurgical documentation, including Mill Test Certificates (MTC) matching EN 10204 3.1, ASTM standards compliance, and non-destructive eddy-current and hydrostatic testing records. This documentation is essential to verify quality, prevent field failures, and satisfy compliance audits.
Operating from China, Liaocheng Sihe Stainless Steel Material LTD is a manufacturer specializing in high-precision stainless steel coiled tubing, seamless capillary pipes, and polished process tubing. With six modern production lines, we adhere to global engineering standards, including GB, ASTM, ASME, JIS, and EN.
Our metallurgical capabilities cover a wide range of standard and specialized alloys, such as 304/304L, 316L, 321, 317L, 309S, 310S, and INCOLOY800. Additionally, we process advanced materials including Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625. These alloys are selected to withstand challenging industrial conditions, including offshore deepwater wells and corrosive chemical processing environments.
Our specialty lies in producing ultra-long seamless coiled tubing. Available in outer diameters from 0.125 inches (3.175 mm) to 1 inch (25.4 mm) with wall thicknesses up to 0.165 inches (3 mm), our continuous coiled tubing can reach single-coil lengths of 32,800 feet (10,000 meters) without orbital welds. This continuous length minimizes leakage risk, supporting safer subsea umbilical manufacturing and chemical injection systems.
Using inline bright annealing (BA) furnace technology, we process tubing in protective atmosphere conditions, delivering smooth, oxide-free inner and outer surfaces. This technique improves corrosion resistance and material purity, which are critical requirements for semiconductor fabrication and pharmaceutical process systems.
Our manufacturing and processing services are tailored to meet complex, custom engineering blueprints.
We supply precision helical coils, multi-layered spiral forms, and custom bends. Supported materials include 304, 316L, and Duplex 2205, with tube diameters from 6.35 mm to 19 mm, optimized for industrial heat exchangers.
We provide laser, mechanical, and abrasive cutting options. Our facility offers high-precision cut-to-length tubes with square ends and minimal burring, suited for automated orbital welding.
We utilize inline hydrogen-atmosphere bright annealing (BA) to eliminate internal stresses and restore ductility. This process preserves a clean, scale-free reflective finish on both the interior and exterior walls.
Our end-forming services include custom flanging, expanding, and reduction options. These preparations support reliable joints in high-vibration systems like automotive exhaust pipes and chemical transport lines.
Every batch undergoes testing to verify safety limits. Our protocols include 100% pneumatic leak testing, hydrostatic pressure testing, mechanical yield/tensile testing, flaring/flattening tests, and hardness checks.
For ultra-clean industries like semiconductor manufacturing and pharmaceutical bioprocesses, we offer precision mechanical and chemical electropolishing. This service reduces internal surface roughness (Ra) down to ≤0.25 µm, preventing bacterial adhesion and particle buildup.
Our tubing is selected for high-demand environments where mechanical reliability and corrosion resistance are essential.
Optimized thermal conductivity and corrosion resistance for high-pressure condensers and boilers.
Seamless coiled tubing prevents refrigerant leaks under high pressures and temperature cycles.
Resists acid, alkali, and chloride erosion, protecting process chemistry pathways.
Highly polished interior surfaces prevent microbiological contamination in dairy and brewing lines.
Sanitary-grade tubing designed to comply with strict bioprocessing cleanroom certifications.
Designed for superheated steam transport and turbine cooling configurations.
Handles aggressive hydrocarbons and sour gas extraction mixtures without localized pitting.
High fatigue strength and thermal resistance for exhaust systems and hydraulic control lines.
Explore our main product categories, manufactured to meet global industrial standards.
Duplex 2205 and austenitic grades designed for subsea umbilicals and chemical injection lines.
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High-pressure tubing optimized for process control systems and offshore chemical injection.
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High-chromium nickel alloy tubing designed for high-temperature boilers and heat treatment furnaces.
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Corrosion-resistant piping options for conveying aggressive acids and high-concentration salt solutions.
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Clean, small-bore capillary tubing designed to protect dual-phase monitoring equipment.
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Superalloys and nickel-based options designed for extreme high-temperature and highly corrosive operations.
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High-purity process tubing with low Ra roughness, optimized for biopharma operations.
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Seamless design supports reliable fluid power transmission under dynamic stress.
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Precision-drawn thin-wall tubing designed for fast, efficient thermal energy transfer.
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Engineered to resist creep damage and scale buildup in utility thermal boiler systems.
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Alloyed with high Molybdenum to prevent pitting and crevice corrosion in acidic gas environments.
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Extremely tight tolerances for microfluidic control, chromatography, and sensor probes.
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We supply flat-rolled products in grades 304, 321, and 316L, designed for pressure vessel fabrication.
VIEW MORE PRODUCT →Our production facilities operate under ISO quality controls to meet global industry requirements.
Answering key questions on material specifications, testing standards, logistics, and pricing.
Complete B2B catalog featuring various material grades, dimensional profiles, and processing finishes.
