Sihe Steel
Sihe Steel
Engineered to withstand extreme environments, corrosives, and high pressures
As a global leader in high-performance alloy fabrication, Liaocheng Sihe Stainless Steel Material Ltd stands at the forefront of engineering premium-grade stainless steel coiled tubing. Operating six state-of-the-art production lines, we focus on the research, development, and high-volume manufacture of stainless steel coiled tubes, precision polishing tubes, and seamless coiled tubing solutions designed to meet the rigorous demands of critical industries.
We maintain strict compliance with international manufacturing benchmarks including GB, ASTM, ASME, JIS, and EN. Our material catalog encompasses a wide range of corrosion-resistant alloys, ensuring structural integrity and reliability under extreme pressures and harsh environments.
Comprehensive technical specifications and material capabilities of our coiled tubing portfolio
Our engineering team works with specialized alloys to address specific degradation mechanisms such as pitting, crevice corrosion, chloride-induced stress corrosion cracking (SCC), and high-temperature oxidation. The table below details our primary material grades and their physical dimension limits:
| Material Category | Common Alloy Grades | Outer Diameter (OD) Range | Wall Thickness (WT) Range | Maximum Continuous Length |
|---|---|---|---|---|
| Austenitic Stainless Steel | 304/304L, 316L, 321, 317L, 309S, 310S | 0.125" to 1.0" (3.175mm to 25.4mm) | Up to 0.165" (3.0mm) | Up to 32,800 feet (10,000 meters) |
| Duplex Stainless Steel | Duplex 2205 (UNS S32205 / S31803) | 0.250" to 1.0" (6.35mm to 25.4mm) | Up to 0.165" (3.0mm) | Up to 25,000 feet (7,620 meters) |
| Super Duplex Steel | Super Duplex 2507 (UNS S32750) | 0.250" to 0.75" (6.35mm to 19.05mm) | Up to 0.120" (3.0mm) | Up to 20,000 feet (6,096 meters) |
| Nickel Alloys & Superalloys | Incoloy 825 (UNS N08825), Inconel 625 (UNS N06625), Incoloy 800 | 0.125" to 1.0" (3.175mm to 25.4mm) | Up to 0.165" (3.0mm) | Up to 32,800 feet (10,000 meters) |
Our coiled tubing options are chosen to optimize lifecycle costs and mechanical reliability:
Integrating advanced online metallurgical treatment and robotic precision controls
Our facility features a protective hydrogen atmosphere inline bright annealing furnace. This system maintains a clean surface finish, eliminating oxide scale and minimizing carbon depletion to ensure consistent mechanical properties throughout long coils.
Quality checks are integrated into our production. Each millimeter of our coiled tubing is subject to Eddy Current Testing (ECT), ultrasonic inspections, hydrostatic verification, and pneumatic tightness tests to confirm pressure containment integrity.
Our tube mill uses orbital gas tungsten arc welding (GTAW/TIG) technology paired with internal weld bead conditioning to produce uniform joints. This reduces stress concentrations, ensuring performance under high-pressure cycle fatigue.
How global procurement networks utilize Liaocheng Sihe's customized coiled tubing
In modern industrial applications, engineers seek to eliminate intermediate mechanical connections. Standard straight-run piping requires orbital welding, which introduces risks of weld decay and localized galvanic corrosion. By supplying continuous lengths up to 32,800 feet (10,000 meters), Sihe Steel helps operators minimize field joints, reducing leakage risks and installation labor costs.
For subsea umbilicals, chemical injection lines, and downhole control lines, our products withstand high external pressures and sour gas corrosion in deep water environments.
Our coiled tubes improve thermal transfer efficiency. By eliminating intermediate fittings, they prevent cross-contamination in critical food processing, pharmaceutical, and chemical systems.
For chemical analysis systems, clean-cut, smooth inner diameter (ID) capillary tubes prevent sample contamination and minimize pressure drop variations.
Aligning with next-generation green energy, high-purity semiconductor tech, and hydrogen transmission
Industrial applications continue to demand greater performance. Our research focus is directed toward three main areas:
By 2026, Liaocheng Sihe aims to expand its seamless processing capabilities, producing continuous lengths of up to 45,000 feet without orbital joints. This supports deepwater offshore oil extraction projects and downhole operations in challenging geothermal environments.
Our commitment to quality, traceable processes, and international standards compliance
Every shipment from Liaocheng Sihe is accompanied by comprehensive quality records, including Mill Test Reports (MTRs) matching EN 10204 3.1, raw material heat chemical composition checks, dimension compliance profiles, and certified test outcomes.
Custom execution capabilities and application-specific coiled tubing designs
Custom dimensions, capillary variations, and structural configurations
Duplex 2205 formulation blending ferrite/austenite phases for durability.
1/2-inch custom OD configurations available in continuous spool packages.
310/310S high-temperature service coil configurations from direct manufacturing.
Specialized tube end processing and custom geometry configurations.
Long-run control lines designed for oil & gas chemical injection systems.
Inline bright annealed tubes ready for subsea instrumentation networks.
High thermal performance tubing designed for chemical condensation plants.
Engineered to withstand high pressure downhole stress in geothermal operations.
Explore our complete catalog of corrosion resistant alloys, precision tubes, and plates
Expert guidance and technical clarification for procurement professionals
