Sihe Steel
Sihe Steel
In modern industrial fluid networks, downhole operations, and control systems, the demand for reliability and zero-point failure has propelled seamless stainless steel coil tubing to the forefront of materials technology. Unlike welded alternatives, seamless coiled tubing is processed without structural discontinuities, offering uniform mechanical properties, higher pressure boundaries, and superior corrosion resistance under extreme loads. Geographically, oil and gas extraction has expanded from shallow fields to deepwater offshore wells. Consequently, materials must withstand elevated levels of H₂S, CO₂, and chlorides at temperatures often exceeding 200°C.
At the same time, the transition of semiconductor processing nodes below 3nm requires gas delivery systems with zero internal contaminants and micro-roughness. Similarly, the rapid commercialization of clean hydrogen and thermal recovery systems relies on highly engineered seamless lines to mitigate hydrogen embrittlement and thermal fatigue. As a leading manufacturer with ten years of specialized production history, Liaocheng Sihe Stainless Steel Material LTD integrates state-of-the-art bright annealing lines to soften alloy compositions inline. This enables us to provide bulk volume supply, customized dimensional profiles, and global project engineering support across the Americas, Europe, the Middle East, and Asia.
Our ultra-long seamless coiled tubes, stretching up to 32,800 feet (10,000 meters) without orbital welds, provide high tensile strength and anti-collapsing properties. This ensures long-term integrity in high-pressure subsea hydraulic controls and chemical injection systems.
For semiconductor fab lines, our 316L seamless coiled tubing features ultra-clean interior surfaces (electro-polished options available) to eliminate micro-particles, ensuring pure gas delivery in high-vacuum chambers.
Specially engineered for boilers, condensers, and heat exchangers, our tubing handles continuous thermal cycling, acidic condensates, and vibration stress across process piping systems.
Liaocheng Sihe Stainless Steel Material LTD is a premier global manufacturing facility specializing in high-performance stainless steel coiled tubes, polishing tubes, and seamless coiled tubing. Utilizing advanced technology and strict quality systems, we manufacture products that comply with GB, ASTM, ASME, JIS, and EN specifications.
Our core capabilities feature continuous cold drawing and pilgering, complemented by inline bright annealing under pure hydrogen atmosphere. This process yields a clean, bright, and scale-free surface finish. This technology ensures optimal material softening, enhancing ductility and formability. This makes our tubes highly suitable for complex field installations, orbital welding, and bending operations without cracking.
We work with a wide spectrum of stainless steels and high alloys designed to perform in challenging corrosive environments:
Our coiled tubing is available in outer diameters ranging from 0.125 inch (3.175 millimeters) to 1 inch (25.4 millimeters). Wall thickness is up to 0.165 inch (3 millimeters). Lengths up to 32,800 feet (10,000 meters) are available for cost-effective umbilical manufacturing. Custom sizes can be produced to meet your requirements.
Supports various materials (e.g., 304, 316L, 2205) and specifications (diameter 6.35mm to 19mm) for stainless steel coils.
Includes bending, spiral forming, precision drawing, and other processes tailored for heat exchangers.
Laser cutting, mechanical cutting, or flame cutting for high-precision and efficient material processing.
We devote ourselves to developing new products with state-of-the-art surface finishing technologies.
Widely used in automotive exhaust systems, chemical pipelines, and precision instrument connections.
Our seamless stainless steel coiled tubing is integrated across diverse critical applications worldwide. From subsea energy networks to hygienic sanitary processing, we engineer solutions to meet demanding operational parameters.
Optimized thermal transfer lines with minimal wall variations for power generation and chemical cooling.
Leak-free coiled circuits handling high-pressure eco-friendly refrigerants with high reliability.
Corrosion-resistant pathways engineered to safely transport aggressive organic and inorganic acids.
Smooth inside diameters that prevent bacteriological growth and meet sanitary standards.
Pure material integrity compliance for sanitization-in-place (SIP) and clean-in-place (CIP) operations.
Superheated steam transmission line components built to withstand high temperatures.
Downhole monitoring lines, capillary sensor cables, and chemical injection mandrels.
Fuel delivery, hydraulic actuators, and structural tubing requiring lightweight strength.
At Liaocheng Sihe Stainless Steel Material LTD, quality is monitored at every stage of production. To verify chemical properties and weld-free homogeneity, all batches undergo strict metallurgical and mechanical examinations in our in-house test labs. Our quality verification includes:
Every length is subjected to online eddy current testing and air tightness checks to ensure zero cracks or surface defects.
Standardized tensile, flattening, flaring, and micro-hardness (100% evaluation) verifications to assure field bendability.
High-pressure water/gas testing to verify structural integrity under extreme downhole pressures.
Laser micrometer checks to ensure tight outer diameter (OD) and wall thickness (WT) tolerances.
Our plant operations operate in strict compliance with ISO, Lloyd's, DNV, and international classifications. Below are our official certifications.
As industries target deeper geological reservoirs and more corrosive operating conditions, the technical roadmap for seamless coiled tubing must advance. Key developments include:
2205 stainless steel is a duplex stainless steel containing austenitic and ferritic structures, offering balanced high strength and chloride corrosion resistance.
1/2 inch stainless steel coiled tubing refers to a coil size widely utilized for instrumentation, hydraulic lines, and pilot systems.
High-temperature resistant 310 alloy coiled tubing, designed to withstand oxidation under continuous thermal exposure.
Detailed geometric boundaries for seamless coiled lines.
| Outer Diameter (OD) | Wall Thickness (WT) | Maximum Length / Coil | Primary Standards | Applications |
|---|---|---|---|---|
| 0.125" (3.18 mm) | 0.020" to 0.035" (0.51 to 0.89 mm) | 32,800 ft (10,000 m) | ASTM A269 / EN 10216-5 | Chromatography, capillary tubes, downhole gauges |
| 0.250" (6.35 mm) | 0.028" to 0.049" (0.71 to 1.24 mm) | 20,000 ft (6,096 m) | ASTM A269 / ASTM A213 | Chemical injection lines, steam tracing |
| 0.375" (9.53 mm) | 0.035" to 0.065" (0.89 to 1.65 mm) | 15,000 ft (4,572 m) | ASTM A269 / GB/T 14976 | Control lines, hydraulic actuation, heat exchangers |
| 0.500" (12.70 mm) | 0.049" to 0.083" (1.24 to 2.11 mm) | 10,000 ft (3,048 m) | ASTM A269 / ASME SA213 | Subsea umbilical components, fluid transport lines |
| 0.750" (19.05 mm) | 0.065" to 0.109" (1.65 to 2.77 mm) | 5,000 ft (1,524 m) | ASTM A269 / JIS G3459 | Corrosive chemical pathways, heat exchanger cores |
| 1.000" (25.40 mm) | 0.083" to 0.165" (2.11 to 4.19 mm) | 3,280 ft (1,000 m) | ASTM A269 / EN 10216-5 | Main process lines, offshore structural loops |
