Sihe Steel
Sihe Steel
Direct supply lines of precision engineered stainless steel sheets, custom plates, and advanced coiled tubing systems complying with GB, ASTM, ASME, JIS, and EN production directives.
Liaocheng Sihe Stainless Steel Material LTD stands at the forefront of China's metallurgical innovation landscape. Boasting over ten years of dedicated production history and executing strict manufacturing processes across six high-capacity production lines, we have cemented our status as global specialists in high-grade stainless steel plates, precision capillary structures, custom-profiled sheets, and extra-long seamless coiled tubes.
We work tightly within global design paradigms. Every run is manufactured in accordance with strict international standards, including GB, ASTM, ASME, JIS, and EN protocols. Our primary alloy categories cover standard austenitic options (304, 304L, 316, 316L, 321, 317L, 309S, 310S, INCOLOY 800) alongside duplex and super duplex configurations (Duplex 2205, Super Duplex 2507) and specialty nickel-based superalloys (Incoloy 825, Inconel 625). This diverse alloy selection guarantees targeted performance profiles in applications featuring structural loads, chemical reactivity, and mechanical wear.
Our coiled tubing systems feature an outer diameter range of 0.125 inches (3.175 mm) to 1 inch (25.4 mm), with custom wall thicknesses reaching up to 0.165 inches (3 mm). Through advanced cold drawing and straightening processes, we are capable of delivering single, joint-free continuous lengths up to 32,800 feet (10,000 meters). These dimensions enable cost-effective assembly of subsea control structures and heavy industrial umbilical cables.
Unlocking critical engineering potential through specialized metallurgical design and continuous innovations in high-entropy alloys and eco-friendly manufacturing.
The chemical composition of our stainless steel portfolio is optimized to withstand extreme stress. In coastal and chemical environments, our AISI 316L and Duplex 2205 alloys prevent localized pitting and chloride stress corrosion cracking (SCC) by forming a stable passive layer. Duplex 2205's dual-phase microstructure balances austenite and ferrite, doubling the yield strength of standard austenitic grades and offering high Pitting Resistance Equivalent Numbers (PREN).
For high-temperature applications, our 310S and Inconel 625 superalloys withstand oxidation and carbonization at temperatures exceeding 1000°C. Adding titanium to Grade 321 prevents chromium carbide precipitation at grain boundaries during welding, preserving structural integrity in demanding thermal cycling environments.
Liaocheng Sihe is shifting toward carbon-neutral steel manufacturing. We use clean electric arc furnace technology and recycled alloys to lower the carbon footprint of our stainless steel sheets and plates.
Our roadmap focuses on refining surface quality. By investing in electropolishing (EP) systems, we can supply ultra-clean capillary tubing with inner surface roughness below Ra 0.13µm. This level of purity is crucial for high-purity gas delivery in the semiconductor and biotechnology sectors.
We operate inline bright annealing systems that heat tubing in a hydrogen-rich atmosphere. This setup prevents surface oxidation, removes residual mechanical stress, and preserves a high-gloss aesthetic finish without requiring chemical descaling.
Years Production Experience
Advanced Production Lines
Exporting Countries & Regions
Testing Compliance Guaranteed
Delivering corrosion-resistant alloy systems and precision fabrication services to meet the demands of global industries.
Tailored processing for 304, 316L, and Duplex 2205 coils with diameters ranging from 6.35 mm to 19 mm.
Bending, tight spiral forming, and precision drawing services tailored for heat exchangers.
Laser, mechanical, and flame cutting systems engineered to achieve tight length tolerances.
Advanced surface finish treatments, including pickling, bright annealing, and electropolishing.
End flanging and expansion processing for automotive exhausts, chemical pipelines, and instrument lines.
How our advanced industrial park in Shandong integrates production, automation, and logistics to secure pricing stability and reliable global delivery.
Liaocheng Sihe Stainless Steel Material LTD operates a highly automated manufacturing base designed around Industry 4.0 principles. We implement real-time tracking systems to monitor material chemistry and dimensional stability from smelt ingot arrival through to final extrusion and coiling processes. This digitalization minimizes waste and maintains dimensional consistency across production runs.
Our raw material supply chain benefits from close partnerships with leading domestic smelters. This integration buffers Sihe Steel from sudden international price fluctuations in nickel, molybdenum, and chromium. Consequently, we can offer competitive wholesale pricing to our international partners.
To support offshore umbilical assembly and chemical pipeline projects, we execute inline non-destructive testing (NDT), including electromagnetic eddy current tests, hydrostatic tests, and ultrasonic checks. By locating these testing units inside our production lines, we identify and isolate structural defects before packaging, preventing delivery delays.
We provide full transparency and compliance documentation, including Mill Test Certificates (EN 10204 3.1/3.2), SGS inspections, and ISO 9001 quality audits.
Explore our deep portfolio of flexible seamless coils, capillary systems, and high-temperature corrosion-resistant tubes.
Duplex 2205 stainless steel contains balanced austenitic and ferritic phases, offering excellent resistance to chloride pitting and high yield strength.
Detailed Dimensions
Standard 1/2-inch coiled tubing designed for high-pressure control lines, chemical injection networks, and subsea control systems.
Detailed Dimensions
310S high-temperature stainless steel tubing offers superior oxidation resistance, making it suitable for aerospace applications and heat exchangers.
Detailed Dimensions
High-precision capillary tubing engineered for gas chromatography, sub-10nm semiconductor lines, and clean room systems.
Detailed Dimensions
Nickel-iron-chromium alloy tubing designed to resist stress-corrosion cracking and localized pitting in oil, gas, and marine environments.
Detailed Dimensions
Mechanically polished stainless steel tubing developed for sanitary fluid networks in the food, beverage, and biotech sectors.
Detailed Dimensions
Super Duplex alloy designed for harsh chloride environments. Features high mechanical strength and strong resistance to pitting corrosion.
Detailed Dimensions
Specialty nickel-based superalloy engineered for aerospace engines and high-stress marine chemical piping applications.
Detailed Dimensions
Extra-long coiled tubes developed for chemical plant heat exchangers. Minimizes the need for mechanical orbital welds.
Detailed Dimensions
High-yield-strength stainless steel hydraulic coils designed to ensure leak-free fluid transmission in machinery control systems.
Detailed Dimensions
Super-long, continuous control lines designed for subsea umbilicals, oil exploration, and deep-sea deployments.
Detailed Dimensions
High-durability stainless steel tubing designed for diesel common rail systems and high-pressure automotive exhausts.
Detailed DimensionsAddressing the complex requirements of modern procurement managers, engineering firms, and high-volume industrial distributors.
We help engineering procurement managers mitigate compliance risks by providing complete testing documentation for every shipment. This includes chemical analysis, mechanical property verification, and non-destructive testing (NDT) records, such as eddy current and hydrostatic tests, ensuring conformance with project specifications.
To protect products during maritime transport, we utilize high-quality export packaging. Tubing is secured on custom wooden reels, wrapped in heavy PVC shielding, and treated with desiccants. For high-purity capillary tubing, we offer nitrogen purging and hermetic end-capping to prevent internal contamination.
We coordinate logistics to match your project timelines, supporting multiple shipping options, including container shipping (FCL/LCL) and air freight. Our compliance team prepares the necessary certificates of origin and customs documents to facilitate clear port clearance.
High-precision stainless steel exchanger pipes, capillary coils, and automotive welded assemblies engineered to international standards.
Find technical answers regarding pricing structures, lead times, warranties, shipping methods, and custom processing options.
Our pricing is dynamic and reflects raw material costs (nickel, chromium, molybdenum) alongside order volume and customization levels. We provide customized, project-specific quotes. Contact our sales department to receive an updated price list tailored to your specifications.
Yes, we require minimum order quantities for international shipments to maintain production line efficiency. MOQs depend on the alloy grade, diameter, and wall thickness. For small-volume requirements or trials, contact our team to discuss inventory availability.
Yes, we provide quality documentation for all shipments. This includes Mill Test Certificates (MTC) conforming to EN 10204 3.1 or 3.2, chemical analysis reports, mechanical properties verification, non-destructive testing (NDT) certificates, and Certificate of Origin (CO) documents.
For standard samples, the lead time is approximately 7 days. For mass production runs, the typical lead time is 20 to 30 days after receiving deposit confirmation and technical drawing approval. We will work with your logistics team to coordinate delivery schedules.
Our standard payment terms are a 30% deposit in advance via bank wire transfer (T/T), with the remaining 70% balance paid against the copy of the Bill of Lading (B/L). We also accept secure payments through Western Union or PayPal for sample orders.
We warrant our materials against manufacturing defects and deviations from specified standards. If a material issue arises, our quality engineering team will review the claim, perform metallurgical evaluations, and work to resolve the concern through replacements or technical support.
We use heavy-duty export packaging, including steel-reinforced wooden reels, protective shrink wrapping, and moisture-resistant vapor barriers. Hazardous cargo or specialized products receive packaging that meets international shipping standards to prevent transit damage.
Shipping fees are determined by shipment volume, weight, destination port, and delivery terms (e.g., FOB, CIF, DDP). Ocean freight is typically the most cost-effective option for large bulk orders, while express courier or air freight is suited for urgent samples. We can provide shipping estimates based on your order details.
