Sihe Steel
Sihe Steel
Explore our primary portfolio of ultra-precision seamless coiled tubes, heat exchangers, and industrial sheets engineered for extreme-pressure environments.
Liaocheng Sihe Stainless Steel Material LTD stands as a premier manufacturing pioneer specializing in high-performance seamless stainless steel coiled tubing, precision capillary tubing, and complex metallurgical profiles. Operating from our advanced facility in Shandong, China, we configure and supply high-integrity tubing systems tailored strictly to international code criteria, including GB, ASTM, ASME, JIS, and EN standards.
Seamless capillary tubes represent the vascular system of modern heavy industries. Characterized by incredibly tight dimensional tolerances and ultra-smooth internal surfaces, these micro-diameter pipes are essential in applications where flow precision, high pressures, and chemical neutrality are critical. Whether conveying mobile phases in chromatography systems or injecting scale inhibitors in deepwater oil fields, capillary performance directly dictates operational safety and instrument accuracy.
As offshore exploration pushes further into high-pressure high-temperature (HPHT) subsea reservoirs, the physical requirements placed on umbilical control lines have grown exponentially. Similarly, the rapid advancement of pharmaceutical biotechnology and sub-nanometer semiconductor fabrication demands tubing that introduces zero trace contamination. We address these emerging parameters through meticulous raw material validation and advanced plug drawing technologies.
Engineered with high pitting resistance equivalence numbers (PREN), our duplex and super duplex capillary tubing withstands high chloride levels and sour gas downhole environments.
The seamless structure ensures consistent wall thickness and zero longitudinal weld defects, capable of handling burst pressures exceeding 20,000 psi safely.
We manufacture continuous seamless coil tubing up to 32,800 feet (10,000 meters) without orbital joint welds, reducing potential leakage pathways in offshore installations.
How does Liaocheng Sihe align cost efficiencies with world-class metallurgical properties? By implementing a highly optimized production pipeline that integrates cold drawing, in-line annealing, and comprehensive quality validation in a single facility.
Our facility runs advanced hydrogen-shielded online bright annealing furnaces. During drawing, the mechanical stresses on the crystal lattices of austenitic steels (316L, 321) and nickel alloys are relieved dynamically. The hydrogen protective gas prevents oxygen exposure, delivering an scale-free, mirror-polished outer and inner diameter that requires no subsequent pickling.
Our zero-defect target is sustained by a battery of in-house testing methods:
Our laboratory evaluates metallurgical characteristics and verifies conformance to ISO and ASTM parameters.
Review our high-performance alloys and configuration limits to identify the correct solution for your custom pipeline installation.
| Alloy Class | Material Designation | Pitting Resistance (PREN) | Outer Diameter (OD) Range | Wall Thickness (WT) | Primary Industrial Sector |
|---|---|---|---|---|---|
| Austenitic Steel | 304/304L, 316L, 317L, 321 | 18 - 25 | 0.125" - 1.0" (3.175 - 25.4mm) | Up to 0.165" (3.0mm) | Pharma, Biotechnology, Instrumentation |
| High Temp Austenitic | 309S, 310S, INCOLOY 800 | 22 - 28 | 0.125" - 0.75" (3.175 - 19.05mm) | Up to 0.120" (3.0mm) | Boilers, High-Temp Heat Exchangers |
| Duplex & Super Duplex | Duplex 2205, Super Duplex 2507 | 34 - 42 | 0.125" - 1.0" (3.175 - 25.4mm) | Up to 0.165" (3.0mm) | Subsea Umbilicals, Offshore Drilling |
| Nickel Superalloys | Incoloy 825, Inconel 625 | 32 - 50 | 0.125" - 0.75" (3.175 - 19.05mm) | Up to 0.120" (3.0mm) | Sour Gas, Deepwater Chemical Injection |
To calculate burst pressure, please reference Barlow's Formula: $P = (2S \times t) / D$, where $S$ is allowable stress, $t$ is wall thickness, and $D$ is outside diameter. For subsea umbilical pipelines, our team supplies continuous coils up to 10,000 meters (32,800 feet) to avoid mid-line joint failure modes.
Beyond raw tube drawing, we provide downstream processing and fabrication to save engineering assembly hours at your facility.
Supports raw sizing ranges from 6.35mm to 19mm in continuous spools, dynamically layer-wound on steel frames for automatic pay-out systems.
Advanced hydraulic bending centers produce highly optimized heat exchanger coils, maximizing surface area-to-volume ratio without wall thinning.
Micro-cutting stations ensure clean burr-free cuts with tolerances within +/- 0.05mm. No thermal distortion or alteration of localized mechanical profiles.
Offering mechanical interior polishing, electrochemical passivation, and outer sheathing for maximum longevity under extreme maritime atmospheric corrosion.
Specialized processing for integration with compression fittings, widely applied in subsea connections and critical chemical processing pipelines.
Our products operate under heavy pressure and temperature parameters in critical industries worldwide.
Optimized alloy profiles (309S, 310S) ensuring thermal conductivity and resisting stress-corrosion cracking.
Tight dimensional capillary tolerances for accurate refrigerant metering and long-term system life.
Conveying corrosive acids, bases, and catalyst fluids at elevated pressures without leakage risk.
Passivated sanitary tubing ensuring clean processing zones and preventing product contamination.
High-purity capillary lines for chromatographs, sterile sampling manifolds, and pharmaceutical processing.
Precision instrumentation and control-loop piping system installations in coal, gas, and nuclear power operations.
Underground chemical distribution, refinery instrumentation lines, and high-pressure process gas analysis.
Fuel lines, hydraulic actuators, sensing capillaries, and exhaust system manifolds designed for extreme vibrations.
Our manufacturing systems and metallurgical outputs comply fully with ISO and international classification registers.
Clear, detailed answers regarding procurement, quality control, international delivery, and customization capabilities.
Our prices are subject to change depending on material alloy grades, processing complexities, raw metal indexes, and volume requirements. We will send you an updated price list after your company contacts us for further information.
Yes, we require all international orders to have an ongoing minimum order quantity. For specific standard sizes, stock is readily available. For custom alloy draws, MOQs depend on specific OD and wall thickness parameters.
Absolutely. We provide full documentation including Mill Test Reports (EN 10204 3.1/3.2), Certificates of Analysis, Origin Certificates, export shipping papers, and third-party inspection reviews (SGS, TUV) upon request.
For pre-engineered samples, lead time is approximately 7 days. For full mill-run production, lead times average 20-30 days after receiving your deposit and design approval. We operate dynamic scheduling to align with customer project timelines.
We accept payments via Telegraphic Transfer (T/T), Western Union, or PayPal. Standard procurement terms are 30% deposit in advance, with the remaining 70% balance paid against a copy of the Bill of Lading (B/L).
We warrant that our materials conform to technical drawings and standard criteria. It is our absolute company policy to resolve any dimensional or metallurgical issues to our customer's satisfaction prior to and after shipment.
Yes. All spooled products are packed on custom steel or wooden drums and wrapped in protective film. For maritime shipments, we secure packaging inside heavy-duty crates to prevent corrosion and physical damage during transit.
Shipping costs depend on the delivery method, freight volume, weight, and port of destination. Sea freight is highly economical for bulk container quantities, while express courier works best for urgent sample approvals.
Select from our specialized sheet, plate, and custom heat exchanger piping inventory below.
