Sihe Steel
Sihe Steel
Direct factory quotes on standard-compliant, high-integrity precision tubing and sheets manufactured in Liaocheng, China.
Precision-drawn 201 alloy pipes designed to meet specific JIS & DIN technical metrics.
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Extreme corrosion resistance for chemical injection systems and offshore umbilicals.
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Super-long continuous seamless coils for heat exchangers and hydraulic oil lines.
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Superb bright polished internal & external surfaces for food, pharma, and decorative setups.
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High-precision 3.175mm OD x 0.5mm wall capillary tubing designed for analytical instruments.
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High durability structural sheet steel matching precise Japanese Industrial Standards (JIS).
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High strength, pitting, and crevice corrosion resistance via Duplex steel microstructure.
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Premium Grade 304 & 316 structural and dynamic pipe coil networks for heavy industry.
View DetailsAdvanced Production Lines
Continuous Coil Lengths
Non-Destructive Testing
Exporting Destination Countries
As deepwater exploration pushes limits and chemical processes run at higher temperatures and pressures, structural integrity is paramount. Liaocheng Sihe Stainless Steel Material LTD stands as a key partner in this shift, maintaining six high-efficiency production lines that manufacture state-of-the-art sheet and pipe configurations.
We specialized in fabricating high-integrity stainless steel coiled tube, polishing tubing, and stainless steel seamless coiled tubing. We adhere strictly to standard parameters set by GB, ASTM, ASME, JIS, and EN. Our material selections span standard austenitic grades to high-performance alloys: 304/304L, 316L, 321, 317L, 309S, 310S, and Incoloy 800, alongside performance-specific metals like Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625.
Our long-length continuous coiled tubing reaches lengths up to 32,800 feet (10,000 meters) without a single orbital weld. This structural continuity eliminates leak paths in dynamic subsea applications, resulting in reliable solutions for deep-sea oil extraction, geothermal energy wells, and aerospace fuel systems.
Combining automated production flows with advanced materials science to ensure repeatable accuracy and structural integrity.
We use bright annealing technology using a pure hydrogen atmosphere. This process prevents surface oxidation, mitigates carbide precipitation along grain boundaries, and maintains a highly clean internal surface finish (ID roughness Ra < 0.4μm).
Every batch of stainless steel seamless coiled tubing undergoes 100% pneumatic testing, hydraulic pressure verification, flaring/flattening tests, micro-structure evaluation, and inline eddy current testing to guarantee defect-free steel structure.
From complex orbital welding procedures to custom precision bending, localized straightening, and flanging, we provide complete, field-ready processing. This makes our tubes easy to integrate directly into skid layouts and marine vessel assemblies.
Comprehensive sizing configurations for seamless coiled and capillary tubing engineered to match high-pressure applications.
| Metal Grade Category | Outer Diameter (OD) Range | Wall Thickness (WT) Range | Max Single Length | Primary Industrial Standard |
|---|---|---|---|---|
| Austenitic (304/304L, 316/316L, 321, 317L) | 0.125 in (3.175 mm) - 1.00 in (25.4 mm) | Up to 0.165 in (3.0 mm) | Up to 32,800 ft (10,000 m) | ASTM A269, ASTM A312, EN 10216-5 |
| Duplex & Super Duplex (2205, 2507) | 0.250 in (6.35 mm) - 0.750 in (19.05 mm) | 0.028 in (0.71 mm) - 0.095 in (2.41 mm) | Up to 16,400 ft (5,000 m) | ASTM A789, EN 10216-5 |
| Super Alloys (Incoloy 825, Inconel 625) | 0.125 in (3.175 mm) - 0.500 in (12.7 mm) | 0.020 in (0.50 mm) - 0.083 in (2.11 mm) | Up to 9,840 ft (3,000 m) | ASTM B423, ASTM B704 |
*Custom dimensions, tight OD/ID tolerances (up to ±0.05 mm), and special surface treatments are available upon request.
Providing corrosion-resistant solutions to critical infrastructures, harsh offshore projects, and high-purity medical environments.
Designed for deepwater environments where severe chemical reactions and structural loads are common. Ideal for hydraulic controls, chemical injection lines, and subsea tie-back assemblies.
Ultraclean electro-polished capillary tubes reduce product contamination risks. Perfect for diagnostic equipment, gas chromatography lines, and liquid transport assemblies.
Lightweight, high-pressure hydraulic lines made of Titanium-stabilized 321 or Duplex alloys offer structural longevity under intense vibrations and extreme thermal shifts.
Ensuring ultra-high-purity gas delivery lines feature precise mechanical dimensions and high chemical purity, preventing trace element cross-contamination.
Modern industrial standards demand materials that can withstand increasingly harsh operating parameters. Sihe Steel's product development focuses on two main engineering directions:
We are reducing our environmental footprint by using electric arc furnace (EAF) steel sources and recycling hydrogen gas in our bright annealing lines. Improving energy efficiency aligns with global carbon-reduction programs and helps lower raw-material supply costs.
By using automated wall-thickness measuring sensors, we reduce scrap generation rates to under 0.8% across our lines. This ensures consistent quality and material performance for every batch shipped.
Our mill test certificates (MTC) confirm compliance with ISO 9001, PED 2014/68/EU, and marine classification standards.
Custom metalworking capabilities designed to deliver project-specific, install-ready piping solutions.
Made from Duplex 2205 and 316L, this tubing features high yield strength and pitting resistance, making it suitable for subsea environments.
Commonly used for high-pressure control systems, heat exchangers, and chemical transfer lines.
High-chromium, high-nickel alloy coiled tubing designed for high-temperature applications (up to 1100°C), such as furnace liners and boilers.
Our custom processing services support materials like 304, 316L, and 2205. We can customize outer diameters from 6.35 mm to 19 mm to fit specific space-constrained configurations.
Using advanced laser and mechanical cutting processes, we achieve straight-cut length tolerances of within ±0.5 mm for manual instrument assemblies.
We provide structural flared and flanged tube ends for automotive exhaust joints, chemical pipes, and precision instrument fittings.
Our stainless steel coils are used across a range of international manufacturing sectors.
Our seamless coils reduce joint-leakage risks in thermal transfer equipment.
Resistant to high operating pressures and temperature cycles in cooling systems.
Protects lines handling corrosive chemical compounds and hot acidic elements.
Easy-to-clean inner surfaces comply with food-grade sanitary requirements.
Maintains material purity and clean liquid transport lines under high-temperature sterilization.
Handles water treatment lines, superheaters, and steam transport systems.
Withstands high pressures and sulfidation risks in modern refineries.
High-vibration fatigue limits for hydraulic systems and high-pressure fuel lines.
Get answers to common technical, logistics, and pricing questions about our stainless steel tubing.
Explore our selections of high-performance alloy tubing, heat-exchanger pipes, and insulated lines.
High-nickel Inconel 625 precision pipe designed for extreme temperatures and pressures.
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Welded 316-grade pipes for chemical processing and industrial transfer systems.
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Encapsulated 304 tubing designed to withstand mechanical wear in downhole environments.
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High-tolerance hydraulic line tubes compliant with Japanese Industrial Standards.
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304-grade heat exchanger pipes built to ASTM A312 standards for heat transfer efficiency.
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Low-carbon 316L coiled tubes designed for high-stress applications.
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High-finish 304-grade polished tubing matching ASTM A269 dimensional specifications.
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202-grade welded exhaust pipes designed for automotive emissions routing systems.
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