Sihe Steel
Sihe Steel
Explore our engineering-grade stainless steel coiled pipes, precision capillary lines, and high-temperature alloy tubing engineered to meet strict international standards.
Operating with a decade-long legacy of manufacturing excellence, Liaocheng Sihe Stainless Steel Material LTD is a premier global manufacturer and direct supplier specializing in high-performance stainless steel coiled tubes, seamless coiled tubing, and precision-polished products. Spanning a state-of-the-art facility equipped with six advanced, automated production lines, we service critical industries across the globe.
Our facilities strict adherence to standards such as GB, ASTM, ASME, JIS, and EN ensures our coiled tubing processes remain ahead of international quality benchmarks. To ensure structural integrity, we integrate world-class bright annealing technology, facilitating online softening treatments that maintain absolute uniformity across long run requirements. We execute a comprehensive suite of rigorous mechanical and destructive testing protocols in-house, including pressure-tests, flaring, bending, 100% hardness validation, tensile strain, and helium-leak/air-tightness testing.
Production Lines
Export Countries
Continuous Length
Quality Inspected
ASTM A249 governs welded austenitic steel tubes designed for boilers, superheaters, heat exchangers, and condenser applications, demanding precise wall consistency and high heat transfer performance.
Our processing lines handle an extensive range of alloys, catering to corrosive chemical environments, high-pressure subsea control lines, and ultra-high-temperature thermal processes. The alloys we produce include:
Our coiled tubing dimension configurations range from outer diameters of 0.125 inch (3.175 mm) to 1 inch (25.4 mm), with wall thicknesses up to 0.165 inch (3 mm). Continuous joint-free lengths of up to 32,800 feet (10,000 meters) are manufactured to optimize subsea umbilical cost structures by omitting orbital weld joints.
| Alloy Grade | UNS Designation | Tensile Strength (Min) | Yield Strength (Min) | Principal Applications |
|---|---|---|---|---|
| 304 / 304L | S30400 / S30403 | 485 MPa (70 ksi) | 170 MPa (25 ksi) | General thermal transfer, food processing, beer cooling coils. |
| 316L | S31603 | 485 MPa (70 ksi) | 170 MPa (25 ksi) | Marine, chemical process lines, medical instrumentation. |
| Duplex 2205 | S32205 / S31803 | 655 MPa (95 ksi) | 450 MPa (65 ksi) | Chloride-containing chemical equipment, petrochemical, offshore. |
| Super Duplex 2507 | S32750 | 800 MPa (116 ksi) | 550 MPa (80 ksi) | Deepwater oil exploration, subsea control lines (umbilicals). |
| Inconel 625 | N06625 | 827 MPa (120 ksi) | 414 MPa (60 ksi) | Extreme corrosive, high pressure and temperature environments. |
Strategic geographic location, optimized logistics, and direct mill relationships drive Sihe Steel Group's competitive edge in the global steel market.
By bypassing trade intermediaries, we source prime raw materials directly from China's primary steel hubs (such as TISCO, Baosteel), keeping prices highly competitive without compromising certification authenticity.
Online bright annealing systems perform induction heating up to 1050°C in pure hydrogen protective atmospheres. This eliminates surface oxidation, leaving a clean, highly corrosion-resistant inner and outer surface.
Located in Shandong, we maintain close links to Qingdao Port and Tianjin Port. This guarantees prompt ocean transport routes to North America, Europe (Germany, Spain), South America, the Middle East, and Southeast Asia.
As modern process plants operate under increasingly hostile pressures and temperatures, requirements for jointless, corrosion-resistant alloy tubing are growing.
Global procurement teams in the chemical, power generation, and marine sectors require high metallurgical integrity. The rising use of deepwater oil exploration calls for long, seamless control lines capable of resisting pitting and crevice corrosion under high pressure. Standard length tubes (typically 6-12m) require extensive orbital welding, which introduces potential failure points and weld-heat affected zones (HAZ).
In response, Liaocheng Sihe manufactures continuous long-run spools of up to 10,000m, designed to satisfy the safety requirements of offshore oil and gas operations. Additionally, industries such as biotechnology, pharmaceuticals, and semiconductors demand ultra-smooth internal surfaces to prevent bacterial growth and particulate accumulation. To address this, we supply precision-drawn and mechanical/electropolished tubing with minimal internal roughness.
Our production facilities specialize in a diverse range of metal configurations, covering coiled profiles, heat exchangers, and flat rolled materials.
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Liaocheng Sihe provides post-production customization to adapt raw coiled tubing to specific chemical processes and heat transfer layouts.
We process various materials (such as 304, 316L, 2205) and custom specifications, covering standard diameters from 6.35mm to 19mm, tailored to your design pressures.
We offer specialized precision drawing, bending, and spiral-forming procedures. These techniques are designed for space-constrained heat exchangers, helping to maximize heat transfer area per unit volume.
Our facility provides precise length adjustments via automated laser cutting, mechanical abrasive saw cut methods, or flame cutting configurations. These methods ensure flat ends with minimal burr formation.
We supply various surface treatments, including mechanical polishing and pickling/passivation. These processes remove free iron from surfaces, ensuring optimal resistance against localized pitting corrosion.
Our flanging services process tube ends to secure tight, leak-free mechanical seals. These finishes are commonly used in automotive exhaust networks, chemical lines, and precision diagnostic devices.
From deepwater oil extraction umbilical lines to clean room pharmaceutical systems, our coiled tubes perform reliably in highly demanding environments.
Liaocheng Sihe operates in compliance with global quality systems, ensuring traceabilities from the raw metal melt through final spooling.
To comply with ASTM A249 and related specifications, all tubing undergoes rigorous, standardized testing protocols:
We supply full Material Test Reports (MTRs) to EN 10204 3.1, containing verified heat chemistries, mechanical test results, and pressure ratings.
Find answers to common questions about ASTM A249 coiled tubing, manufacturing tolerances, shipping logistics, and compliance.
Our pricing fluctuates based on raw alloy costs (such as nickel, chromium, and molybdenum) and global market variables. Contact our sales department with your specific grade and dimension requirements to receive a current, customized quote sheet.
Yes, all international shipments require a minimum order quantity to maintain manufacturing efficiency on our production lines. For specialized or small-scale quantities, please contact our team to discuss project-specific options.
We supply complete documentation packages with all shipments. This includes Certificates of Analysis/Conformance (EN 10204 3.1), marine insurance certificates, Certificates of Origin, and all standard export customs documentation.
For standard samples, our production lead time is approximately 7 days. For mass production runs, delivery is usually completed within 20 to 30 days after receipt of deposit and technical sign-off. We work to accommodate tight project schedules whenever possible.
We accept T/T (30% deposit in advance, 70% balance against the copy of B/L), L/C, Western Union, and PayPal for sample runs.
We warrant our materials and manufacturing workmanship. We are committed to resolving quality-related inquiries to our clients' satisfaction, regardless of standard warranty timelines.
We package all shipments in heavy-duty export crates, securing spools on steel or wooden reels. Specialized packaging, including vacuum seal bags or hazardous packaging options, is available upon request.
ASTM A249 is designed specifically for welded tubes used in heat exchangers, boilers, and superheaters. It mandates mechanical testing such as tension, flattening, and flaring. ASTM A269 is intended for general service applications and typically does not require the same mechanical testing protocols.
Browse our complete catalog of industrial tubes, including custom-designed cooling coils, precision capillary lines, and high-temp alloy tubes.
