Sihe Steel
Sihe Steel
In modern industrial engineering, seamless stainless steel tubing acts as the vital arteries of critical systems. Unlike welded alternatives, seamless tubes offer unmatched reliability under high pressures, corrosive chemicals, and extreme temperatures. Globally, the demand for precision-engineered seamless coils and capillary tubing is escalating, driven by offshore deepwater oil and gas operations, rapid semiconductor fab expansions, renewable energy integration, and sophisticated aerospace engineering.
The offshore oil and gas industry, in particular, is transitioning to deeper waters and harsher subsea environments. The chemical composition of deep reservoirs—often rich in chlorides, hydrogen sulfide (H2S), and carbon dioxide (CO2)—poses a severe threat of stress corrosion cracking (SCC) and pitting. Engineers rely on advanced alloys like Duplex 2205, Super Duplex 2507, and Nickel-Iron-Chromium alloys such as Incoloy 825 and Inconel 625 to construct subsea control lines, chemical injection lines, and umbilical systems. Selecting the correct metallurgical specification directly dictates the lifecycle reliability and environmental safety of multi-billion dollar installations.
Liaocheng sihe stainless steel material LTD is a leading manufacturer specializing in high-performance stainless steel coiled tubes, stainless steel polishing tubes, and stainless steel seamless coiled tubing. Armed with six advanced production lines, we strictly adhere to domestic and international production standards including GB, ASTM, ASME, JIS, and EN.
Our material portfolio spans premier grades: 304/304L, 316L, 321, 317L, 309S, 310S, INCOLOY 800, Austenitic steel 316L, Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625. We integrate the world's first-class online bright annealing technology to achieve superior material normalization, softening, and oxidation-free finishes.
Chinese stainless steel manufacturers have transitioned from high-volume production units to precision-driven, high-technology engineering hubs. The industrial cluster in Liaocheng benefits from vertical supply chain integration, reducing material transport times and cost overheads. Liaocheng Sihe Stainless Steel Material LTD leverages this ecosystem by using advanced automation systems, ensuring that our seamless coiled tubes maintain continuous quality over extremely long spans—up to 32,800 feet (10,000 meters) without a single orbital weld.
The primary technological differentiator is the implementation of online bright annealing (BA). By heating the cold-drawn seamless tubes to over 1040°C in a highly controlled hydrogen-nitrogen protective atmosphere, we prevent chromium carbide precipitation and oxide scaling. The resulting tube displays a smooth, mirror-like inner and outer surface, critical for high-purity semiconductor gas delivery lines, clean-in-place (CIP) food processing lines, and ultra-high-pressure hydraulic systems. This process significantly improves structural ductility, corrosion resistance, and surface finish consistency.
| Material Grade | Outer Diameter (OD) Range | Wall Thickness (WT) Range | Key Standards | Primary Industrial Applications |
|---|---|---|---|---|
| 304 / 304L | 0.125" to 1" (3.175 - 25.4 mm) | Up to 0.165" (3.0 mm) | ASTM A269, A312, EN 10216-5 | HVAC, Heat Exchangers, Automotive, Water Heaters |
| 316L | 0.125" to 1" (3.175 - 25.4 mm) | Up to 0.165" (3.0 mm) | ASTM A269, A312, JIS G3459 | Marine, Biotechnology, Pharma, Chemical Processing |
| Duplex 2205 / 2507 | 0.250" to 1" (6.35 - 25.4 mm) | Up to 0.165" (3.0 mm) | ASTM A789, ASTM A790 | Subsea Umbilicals, Oil & Gas Extraction, High Chlorides |
| Incoloy 825 / Inconel 625 | 0.125" to 1" (3.175 - 25.4 mm) | Up to 0.120" (3.0 mm) | ASTM B163, ASTM B423 | Geothermal Wells, Aerospace, Acid Gas Extraction |
At Liaocheng Sihe Stainless Steel Material LTD, we understand that raw seamless tubes require precision processing to fit seamlessly into specialized assemblies. Our state-of-the-art facilities offer custom fabrication services designed to meet specific engineering tolerances.
Supports various materials (e.g., 304, 316L, 2205) and specifications (diameter 6.35mm to 19mm) for stainless steel coils.
Includes mechanical bending, complex spiral forming, precision drawing, and custom sizing designed for specialized heat exchangers.
Industrial laser cutting, mechanical abrasive cutting, or flame cutting optimized for high-precision, burr-free end configurations.
We devote ourselves to developing new products with state-of-art technologies, providing bright annealing, passivation, and electropolishing.
Highly accurate flanging and flare-end processing, extensively used in automotive exhaust systems, chemical pipelines, and precision instrument connections.
Our seamless stainless steel coils and capillary tubing operate across critical industrial applications globally:
Our quality management structure is certified to international manufacturing guidelines. We execute comprehensive destructive and non-destructive evaluations (NDE), including hydrostatic testing, eddy current inspections, intergranular corrosion testing (ASTM A262 Practice A/E), and metallurgical grain size analysis. This ensures that every coil delivered exhibits standard mechanical properties.
Our prices are subject to change depending on supply, raw material fluctuations (LME nickel/molybdenum values), and other market factors. 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. If you are looking to resell but in much smaller quantities, we recommend you check out the details on our website or get in touch directly to discuss small-batch configurations.
Yes, we provide comprehensive documentation packs, including EN 10204 3.1 Mill Test Certificates (MTC), Certificates of Analysis (CoA), Conformance Statements, Insurance Protocols, Certificates of Origin, and standard export document sets.
For custom prototype samples, our typical lead time is about 7 days. For mass production runs, the lead time is 20-30 days after receiving deposit confirmation. Lead times are calculated upon (1) receiving the advance deposit, and (2) final technical approval of the custom manufacturing drawings. We work closely with our partners to compress cycle times where urgent deployment is needed.
We accept secure payments via Bank Telegraphic Transfer (T/T), Western Union, or PayPal. Our typical agreement terms are a 30% deposit in advance, with the remaining 70% balance due against the copy of the Bill of Lading (B/L).
We guarantee the integrity of our materials and workmanship under standard operating procedures. Our company culture drives us to address and resolve any issues to customer satisfaction, whether covered under the warranty window or during extended operations.
Yes, we construct heavy-duty export packaging designed to endure transport stresses. Our coiled tubes are wrapped, reinforced, and shipped in sturdy steel/wooden drums. Specialized hazard packing is applied for dangerous materials, and temperature-controlled freight solutions are arranged when requirements dictate.
Shipping fees are calculated based on your delivery method of choice. Ocean freight is the most cost-effective method for high-volume orders. Air freight is best suited for urgent demands but comes at a premium cost. Precise shipping rates can be computed once order parameters, volume, weights, and destinations are clarified.
Available in outer diameters ranging from 0.125" (3.175mm) to 1" (25.4mm) with wall thicknesses up to 0.165" (3mm). Continuous lengths up to 32,800 ft (10,000 meters) without orbital welds.
