Sihe Steel
Sihe Steel
Direct supply of precision-engineered stainless steel components for diverse processing and system operations.
Within high-performance industrial supply chains, ASTM 304 Stainless Steel Pipe serves as an essential component for demanding infrastructure. Categorized under UNS S30400, this austenitic chromium-nickel alloy is characterized by a precise metallurgical composition: a minimum of 18% chromium and 8% nickel. This elemental balance guarantees the formation of a self-healing passive chromium-oxide layer, providing outstanding resistance to general atmospheric corrosion, oxidizing acids, and organic chemicals.
"ASTM 304 maintains structural stability across a broad thermal range, from cryogenic environments to continuous operating conditions reaching up to 800°C (1472°F)."
For industrial buyers, understanding the distinction between standard 304 and its low-carbon counterpart 304L (UNS S30403) is critical. The reduced carbon content in 304L (≤ 0.03% compared to ≤ 0.08% in standard 304) minimizes the risk of chromium carbide precipitation along grain boundaries during welding. This sensitization prevention ensures maximum mechanical strength and corrosion resistance in weld heat-affected zones (HAZ), eliminating the need for post-weld annealing in most structural configurations.
Liaocheng Sihe Stainless Steel Material LTD manufactures products to comply with international regulatory frameworks:
Our production protocols subject every batch to strict non-destructive testing (NDT), including online eddy current checks, hydrostatic validation, and mechanical tensile/flaring assessments.
Advanced Production Lines
Max Continuous Coil Length
Exporting Destinations
Non-Destructive Tested
A trusted global expert in high-precision coiled tubing and seamless stainless steel piping.
Based in China, Liaocheng Sihe Stainless Steel Material LTD manufactures high-precision stainless steel coiled tubes, seamless coiled tubing, and bright annealed polishing pipes. Armed with six advanced production lines and supported by a specialized metallurgical engineering team, we convert raw steel billets into highly reliable pipelines that perform in challenging industrial environments.
Our raw material portfolio spans basic austenitic grades to specialized corrosion-resistant alloys, ensuring the right solution for every application:
We supply coiled tubing across a versatile dimensional grid: Outer Diameters from 0.125 inch (3.175 mm) to 1 inch (25.4 mm), with wall thicknesses reaching up to 0.165 inch (3 mm). To facilitate subsea installations, umbilical lines, and heat exchangers, we manufacture continuous continuous lengths of up to 32,800 feet (10,000 meters) without orbital welds, minimizing potential leak paths.
A key strength of Liaocheng Sihe is our integrated, inline hydrogen atmosphere bright annealing technology. Traditional heat treatment methods expose the steel's exterior to oxygen, creating oxide scale that requires acid pickling to remove, often leaving a dull finish. Our online bright annealing process heats the tubing in a controlled, oxygen-free hydrogen atmosphere, followed by rapid cooling.
This approach achieves two critical outcomes:
Streamlined raw material sourcing and strategic location advantages ensure timely delivery and consistent quality.
Liaocheng Sihe partners with Tier-1 raw steel manufacturers (such as TISCO and Baosteel). Buying directly from these sources ensures clean melt chemistry with low inclusions, providing consistent weldability and formability during cold drawing.
From initial cold pilgering and multi-pass drawing to inline bright annealing, NDT testing, and final wood-reel spooling, all manufacturing phases take place in our Liaocheng facility. This keeps quality control unified and shortens production cycles to 20-30 days.
Liaocheng's proximity to major North China transport networks and sea ports, including Qingdao Port, allows for fast containerized and bulk cargo shipping. We export to over 30 countries across North America, Europe, and Southeast Asia, ensuring reliable global delivery.
Where ASTM 304 and specialized alloys perform in challenging operating environments.
Tailored fabrication capabilities that supply ready-to-install components for your production lines.
We process stainless steel coils into tight-radius curves, spiral configurations, and custom helical heat exchanger layouts, utilizing CNC bending machinery to keep ovality and thinning within limits.
Utilizing high-speed straightening machines, we deliver straight pipe segments with minimal deviation. Our cutting options include mechanical abrasive sawing, laser slicing, and orbital tube cutting to guarantee square, burr-free end preps.
We offer end flanging, bead forming, and custom flare preparations on coiled tubes. These finishes are used for mechanical compression couplings in automotive exhausts, instrument manifolds, and chemical process piping.
Our quality management systems are verified by international testing bodies to ensure product reliability.
Industrial demand is shifting towards higher material purity and trace certification, coupled with transparent environmental metrics. Liaocheng Sihe is aligning its production processes with these criteria:
These initiatives allow us to support high-tech industries while providing documentation that helps our international clients meet their scope-3 emissions targets.
Detailed explanations regarding sourcing specifications, testing protocols, and order logistics.
Our prices are subject to change depending on supply and other market factors. We will send you an updated price list after your company contact us for further information.
Yes, we require all international orders to have an ongoing minimum order quantity. If you are looking to resell but in much smaller quantities, we recommend you check out our website.
Yes, we can provide most documentation including Certificates of Analysis / Conformance; Insurance; Origin, and other export documents where required.
For samples, the lead time is about 7 days. For mass production, the lead time is 20-30 days after receiving the deposit payment. The lead times become effective when (1) we have received your deposit, and (2) we have your final approval for your products. If our lead times do not work with your deadline, please go over your requirements with your sale. In all cases we will try to accommodate your needs. In most cases we are able to do so.
You can make the payment to our bank account, Western Union or PayPal: 30% deposit in advance, 70% balance against the copy of B/L.
We warranty our materials and workmanship. Our commitment is to your satisfaction with our products. In warranty or not, it is the culture of our company to address and resolve all customer issues to everyone's satisfaction.
Yes, we always use high quality export packaging. We also use specialized hazard packing for dangerous goods and validated cold storage shippers for temperature sensitive items. Specialist packaging and non-standard packing requirements may incur an additional charge.
The shipping cost depends on the way you choose to get the goods. Express is normally the most quickest but also most expensive way. By seafreight is the best solution for big amounts. Exactly freight rates we can only give you if we know the details of amount, weight and way. Please contact us for further information.
ASTM 304 contains 18% chromium and 8% nickel, while ASTM 316L contains 16% chromium, 10% nickel, and 2-3% molybdenum. The addition of molybdenum in 316L provides improved resistance to chloride pitting and crevice corrosion, making it suitable for marine environments, whereas 304 is often selected for its cost-efficiency in general industrial and chemical applications.
We subject all coiled tubing to non-destructive testing, including hydrostatic testing at rated pressures and online eddy current inspections to detect micro-cracks. We also conduct mechanical flaring, flattening, tensile, and hardness tests to verify conformity with ASTM specification limits.
High-integrity coiled tubing, capillary lines, and custom structural alloys for industrial applications.
