Sihe Steel
Sihe Steel
Precision-engineered configurations optimized for high-pressure systems, subsea umbilicals, and critical instrumentation.
In modern industrial landscapes, fluid transit and chemical delivery systems face unprecedented challenges. As exploration projects delve into ultra-deep waters and chemical reactors operate at elevated pressures, standard piping with joined connections is no longer viable. Every weld seam introduces mechanical vulnerability, galvanic corrosion points, and potential failure vectors. This risk has driven the global demand for Super-Long Stainless Steel Coiled Tubing.
By delivering single, continuous lengths of tubing up to 10,000 meters (32,800 feet), we minimize intermediate orbital joints. This ensures uninterrupted structural integrity, essential for subsea umbilicals in deep-water offshore drilling, high-pressure chromatography lines, downhole chemical injection, and cleanroom semiconductor distributions. These super-long tubes must survive harsh conditions, resisting localized pitting, chloride stress corrosion cracking, and structural fatigue under high dynamic pressures.
Global demand is evolving towards higher alloy specifications. While standard grade 316L remains a benchmark, challenging conditions require Duplex 2205, Super Duplex 2507, and advanced nickel-chromium alloys like Inconel 625 and Incoloy 825. Liaocheng Sihe meets this demand by combining advanced metallurgy with precision engineering.
A trusted manufacturing partner with comprehensive processing capabilities and a global delivery footprint.
Liaocheng Sihe Stainless Steel Material Ltd operates from a modern manufacturing plant equipped with six dedicated extrusion and cold-drawing lines. We specialize in producing coiled stainless steel tubes, precision capillary systems, and polished instrumentation pipes. By strictly adhering to international standards (including GB, ASTM, ASME, JIS, and EN), we ensure that every meter of tubing meets precise dimensional tolerances and mechanical criteria.
Our facility features one of the industry's most advanced online bright annealing lines. This technology processes the coiled tube under a highly controlled hydrogen atmosphere, recrystallizing the steel structure without surface oxidation. The result is a scale-free, high-gloss surface finish and uniform ductility, which are crucial for subsequent tube bending, flaring, and installation.
We source certified hot-rolled coils from premium suppliers and perform multi-stage cold drawing to achieve target specifications.
| Dimensional Attribute | Imperial Range | Metric Range |
|---|---|---|
| Outer Diameter (OD) | 0.125 inch to 1.00 inch | 3.175 mm to 25.4 mm |
| Wall Thickness (WT) | Up to 0.165 inch | Up to 3.00 mm |
| Continuous Length | Up to 32,800 feet | Up to 10,000 meters |
| Metallurgical Material Grades |
Austenitic: 304, 304L, 316L, 317L, 321, 309S, 310S Duplex / Super Duplex: UNS S31803 / S2205, UNS S32750 / S2507 Nickel Alloys: Incoloy 800, Incoloy 825, Inconel 625 (UNS N06625) |
|
| Production & Conformity Standards | ASTM A269, ASTM A213, ASTM A789, ASME SA213, ASME SA789, JIS G3459, EN 10216-5, GB/T 14976 | |
TP316L provides excellent resistance to general corrosion and pitting in chloride environments. Added titanium in TP321 protects against intergranular carbide precipitation, while 310S stands up to high-temperature cyclic oxidation.
These dual-phase structures balance ferritic and austenitic properties. Duplex 2205 and Super Duplex 2507 double the mechanical yield strength of standard austenitic alloys while resisting chloride-induced stress corrosion cracking.
Alloy 625 and Incoloy 825 resist crevice corrosion, pitting, and acidic degradation. They perform well under extreme pressure and high temperatures, making them ideal for sour gas processing and marine umbilicals.
The global dominance of Chinese steel manufacturers comes down to structural efficiencies. At Liaocheng Sihe, we offer integrated supply chains, automated production, and strategic locations that translate to major cost and time savings for global buyers.
Our efficiency advantages include:
Liaocheng Sihe bridges the gap between high-level metallurgical performance and competitive global pricing.
We provide a full suite of customization options to ensure your coiled tubes arrive ready for installation.
We work with various materials (304, 316L, 2205) and custom specifications, covering diameters from 6.35mm up to 19.05mm and beyond.
Our facilities handle precision CNC bending, tight-radius spiral coiling, and tailored spatial configurations designed for space-constrained heat exchangers.
We utilize precision laser and mechanical abrasive systems to cut tubing to exact tolerances while preserving the inner diameter profile.
We offer specialized pickling, mechanical polishing, and electro-polishing (EP) to reduce inner-surface roughness for ultra-pure semiconductor lines.
We provide complete end-flanging, orbital weld beveling, and swaged fitting pre-installations to streamline field assembly and hookup.
We apply high-density PVC, TPU, or fluoropolymer encapsulation to protect tubing cores against external mechanical damage and galvanic corrosion.
Our coiled tubes are installed worldwide in environments that demand absolute reliability and zero down-time.
We understand that our products are installed in environments where failures are costly and dangerous. Because of this, Liaocheng Sihe enforces strict testing protocols. Every batch of tubing undergoes rigorous quality checks before shipment.
Our internal quality management system is ISO 9001 certified, and we provide complete material traceability reports (EN 10204 3.1) with each order.
A global guide for modern procurement managers sourcing high-yield metallurgical solutions.
The industrial market is moving towards more challenging operations. Downhole operations now encounter higher levels of sour gas ($H_2S$) and high-temperature chlorides, which has increased the demand for alloys with higher Pitting Resistance Equivalent Numbers (PREN). Industries are shifting from standard TP316L to Super Duplex 2507 and Nickel Alloys to extend equipment life cycles.
Additionally, green hydrogen transit is a growing sector. Transporting hydrogen requires seamless piping that is resistant to hydrogen embrittlement. Liaocheng Sihe is at the forefront of this trend, developing inner surfaces with ultra-low friction and high grain-boundary stability.
When sourcing industrial tubes, procurement managers must look beyond unit price. Total Cost of Ownership (TCO) includes factors like import tariffs, logistics, and the costs associated with weld failures. Sourcing continuous, super-long coils eliminates the need for orbital welds, which reduces field labor costs and lowers inspection expenses.
Liaocheng Sihe addresses these challenges by offering transparent pricing, clear material certification, and robust export packaging. This guarantees that your materials arrive on schedule and in ready-to-install condition.
A breakdown of our manufacturing portfolio, categorized by dimensional envelope and mechanical purpose.
High-yield duplex coiled tubing designed for high-stress subsea installations.
Explore Specifications
Industry-standard 1/2" outer diameter tubing, optimized for general instrumentation.
Explore Specifications
High-temperature scale-resistant steel tubing designed for thermal reactors.
Explore Specifications
Clear answers to common questions about international procurement, production standards, and quality assurance.
Our prices are subject to change depending on material raw costs, alloy grades, and other market factors. We will send you an updated price list after your company contacts us with your specific engineering requirements.
Yes, we require all international orders to have an ongoing minimum order quantity. If you are looking to purchase smaller trial quantities, please contact our sales office to check current stock availability.
Yes, we provide comprehensive documentation, including Certificates of Analysis/Conformance (EN 10204 3.1), shipping insurance, certificates of origin, and custom export documentation as needed.
For standard samples, the lead time is approximately 7 days. For mass production orders, the lead time is 20-30 days after receipt of the deposit. Lead times become effective when we receive your deposit and final technical drawings.
We accept payments via direct bank transfer (T/T), Western Union, and PayPal. Our standard term is a 30% deposit in advance, with the remaining 70% balance paid against the copy of the Bill of Lading (B/L).
We guarantee the quality of our materials and workmanship. Our commitment is to ensure you are satisfied with our products. Regardless of warranty status, our company culture focuses on addressing and resolving any issues to our customers' satisfaction.
Yes, we always use export-quality packaging, wrapping coils in reinforced wooden drums or heavy-duty steel crates. We also handle specialized packing for hazardous goods and cold-storage shipping for temperature-sensitive items when required.
Shipping costs depend on the delivery method you choose. Sea freight is the most cost-effective option for large bulk orders, while express courier is the fastest but most expensive. We calculate exact freight rates once we know the order size, weight, and delivery route.
Extended product lines including welded exhaust pipes, heat exchanger tubes, and structural steel sheets.
