Sihe Steel
Sihe Steel
Explore our industrial range of precision capillary tubes, welded pipes, and specialized alloy coils manufactured under strict international standards.
316 stainless steel capillary tubing represents the pinnacle of high-precision micro-diameter flow technology. Characterized by its narrow bore, thin walls, and exceptional dimensional tolerance, this tubing grade is the industry standard for hostile chemical, marine, and medical environments.
The addition of Molybdenum (typically 2.0% to 3.0%) gives AISI 316/316L capillary tubes superior corrosion resistance over traditional chromium-nickel alloys like 304. Specifically, it offers exceptional resistance against pitting and crevice corrosion in warm chloride environments. This makes it indispensable for critical infrastructure where material failure is not an option.
Our manufacturing processes at Liaocheng Sihe Stainless Steel Material LTD utilize advanced cold-drawing and cold-rolling procedures. By maintaining tight structural control, we deliver precision capillary tubing designed to withstand extreme hydraulic pressures while preventing micro-scale leaks or bio-chemical accumulation inside the bore.
A leading expert and trusted Chinese exporter in the field of high-precision stainless steel coiled and capillary tubing.
Equipped with six state-of-the-art production lines, Liaocheng Sihe Stainless Steel Material LTD operates a world-class manufacturing complex dedicated to precision drawing, processing, and treatment of steel tubes. We strictly adhere to standard production parameters set by GB, ASTM, ASME, JIS, and EN.
Our material list features a comprehensive portfolio of high-performance metals: 304/304L, 316L, 321, 317L, 309S, 310S, INCOLOY 800, Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625.
We specialized in long-length continuous tubing. Our coiled tubing configuration ranges from outer diameter 0.125 inches (3.175 millimeters) to 1 inch (25.4 millimeters), with wall thicknesses reaching 0.165 inches (3 millimeters). For subsea umbilical manufacturing, we can supply continuous splice-free coils up to 32,800 feet (10,000 meters), ensuring the ultimate physical integrity under high-pressure subsea deployment.
A technical guide for global procurement engineers to choose the correct material grade based on environmental stress factors.
| Material Grade | Cr (Chromium) % | Ni (Nickel) % | Mo (Molybdenum) % | Tensile Strength (MPa) | Corrosion Resistance Index | Primary Environments |
|---|---|---|---|---|---|---|
| AISI 304 / 304L | 18.0 - 20.0 | 8.0 - 12.0 | - | ≥ 485 | Moderate | General industrial, food processing, structural applications. |
| AISI 316 / 316L | 16.0 - 18.0 | 10.0 - 14.0 | 2.0 - 3.0 | ≥ 515 | High (Pitting Resistant) | Marine, chemical handling, pharmaceutical, deepwater umbilical. |
| Duplex 2205 | 21.0 - 23.0 | 4.5 - 6.5 | 2.5 - 3.5 | ≥ 620 | Very High | Chloride-heavy chemical reactors, high mechanical load pipelines. |
| Inconel 625 | 20.0 - 23.0 | 58.0 min | 8.0 - 10.0 | ≥ 827 | Extreme | Aerospace propulsion, high-temperature furnace, offshore drilling. |
We deploy specialized manufacturing services designed to optimize flow mechanics, surface finish, and mechanical reliability.
We support bespoke alloy selections (such as 304, 316L, 2205) and custom specifications ranging from 6.35mm to 19mm outer diameters. Perfect for matching precise design blueprints.
Our engineering division shapes capillary tubing via controlled spiral forming and precision drawing processes. Essential for custom-built heat exchangers and space-constrained machinery.
We execute burr-free laser, mechanical, or flame cutting procedures. This ensures high-accuracy capillary tube ends, lowering installation complications during industrial fitting.
Our factory provides online bright annealing and electropolishing. This minimizes micro-scale surface roughness on the inner and outer tube surfaces, preventing bio-contamination and turbulence.
Essential for automotive exhaust lines, high-pressure chemical transfer pipelines, and specialized instrumentation. We handle tight tolerance flanging to standard designs.
Every batch undergoes pneumatic testing, air tightness verification, flare tests, tensile and microhardness validation, ensuring zero defect distribution worldwide.
How Chinese industrial clusters enable cost efficiencies and high-performance quality benchmarks.
China hosts the world's most cohesive metallurgy supply chain. From the raw refinement of Molybdenum, Nickel, and Chromium to advanced cold-drawing benches, every element of the production cycle is colocated. For buyers, this translates to reduced transportation wait times, stable raw material costs, and strict structural control over the chemical configuration of the 316/316L alloy.
Unlike factories relying on outdated open-air heat treatment, Chinese manufacturers leverage inline bright annealing processes using pure hydrogen or nitrogen-hydrogen protective atmospheres. This eliminates the need for aggressive acid pickling while keeping the inner bore bright, smooth, and free of oxide scales—crucial for capillary applications in gas chromatography and chromatography-mass spectrometry (GC-MS).
Liaocheng Sihe Stainless Steel Material LTD has localized support mechanisms catering to ASTM A269/A632 specifications and European PED requirements. We provide complete mill certificates (EN 10204 3.1) and technical compliance documentation to streamline customs clearance and quality verification processes for global enterprises in Europe, North America, and Southeast Asia.
One of our critical competitive edges is our capacity to deliver extremely long, continuous capillary coils. Splice-free tubes up to 10,000 meters decrease the quantity of orbital welds needed in offshore control panels or chemical distribution rigs. Lowering the number of joins directly reduces potential failure zones, lowering installation costs while improving subsea umbilical lifetime.
Global demand is evolving from basic 304 grade toward low-carbon 316L and high-performance duplex stainless steels. Industrial plants are operating under higher pressures and in more corrosive environments. The extra carbon protection in 316L prevents intergranular corrosion during welding, while Duplex options offer double the yield strength of austenitic options. We stand at the forefront of this trend, constantly optimizing our cold drawing bench parameters to match these demanding alloys.
Where precision meets performance: explore how our capillary tubes perform in high-demand environments.
An honest breakdown of industry pricing structures to assist procurement planning and budget preparation.
Capillary tube pricing depends on strict mechanical specifications, processing steps, and macro metal index movements. Because these tubes are drawn through multiple cold-reduction stages, smaller diameters and ultra-thin walls require more passes through the drawing bench, increasing production labor and overall costs.
| Outer Diameter (OD) Range | Wall Thickness (WT) Range | Estimated Base Price (FOB China / Ton) | Key Price Drivers |
|---|---|---|---|
| 0.5 mm - 2.0 mm | 0.1 mm - 0.4 mm | $4,500 - $6,200 | High precision requirements, multiple cold drawing steps, continuous ID inspection. |
| 2.1 mm - 4.0 mm | 0.2 mm - 0.8 mm | $3,800 - $5,100 | Moderate passes, suited for standard medical equipment and chromatography. |
| 4.1 mm - 8.0 mm | 0.5 mm - 1.5 mm | $3,200 - $4,500 | Standard industrial configurations, high processing throughput. |
| Coiled Capillary (Continuous) | 0.8 mm - 2.0 mm | $4,000 - $5,800 | Bright annealing state, orbital splicing verification, custom spooling formats. |
Our products comply with international inspection standards to guarantee safety in high-stress applications.
Get professional, direct answers regarding specifications, procurement logistics, and testing standards.
Our prices are subject to change depending on supply and other market factors. We will send you an updated price list after your company contacts us for further information, outlining current alloy surcharges and manufacturing options.
Yes, we require all international orders to have an ongoing minimum order quantity. For standard specifications, the typical MOQ is 100 kilograms. If you are looking to purchase smaller sample sizes or test runs, please contact our sales team to discuss custom production schedules.
Yes, we provide full technical documentation including Certificates of Analysis / Conformance (EN 10204 3.1 Mill Test Certificates), material traceability, marine insurance records, Certificate of Origin, and custom clearance documents required for immediate import.
For custom prototype samples, the lead time is about 7 days. For standard mass production, the average delivery timeline is 20-30 days after receiving the deposit payment. Lead times start upon receiving the initial deposit and your final product drawings approval.
We accept bank wire transfers (T/T), Western Union, and PayPal. Our typical commercial terms are a 30% deposit in advance, with the remaining 70% balance paid against the copy of the Bill of Lading (B/L).
We wrap all shipments in multi-layer heavy-duty export packaging, including reinforced wooden crates and protective inner core spools. This prevents tube deformation and bending during transport. For custom orders, specialized packing can be customized upon request.
Complete your supply line requirements with our high-grade stainless and alloy steel products.
