Sihe Steel
Sihe Steel
High-durability tubing solutions for chemical processing, automotive exhaust systems, and heat exchangers.
Liaocheng sihe stainless steel material LTD, based in China, operates six advanced production lines. We are a leading expert in the manufacturing and surface development of high-quality stainless steel coiled tubes, stainless steel polishing tubes, and stainless steel seamless coiled tubing. Our operational infrastructure enforces rigorous compliance with global production standards, including GB, ASTM, ASME, JIS, and EN.
We process a wide range of steel grades to meet diverse industrial demands: 304/304L, 316L, 321, 317L, 309S, 310S, and INCOLOY 800. Our capability extends to high-performance alloys such as Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625.
These specialized materials are engineered for use in military systems, semiconductor manufacturing, pharmaceutical biotechnology, precision instrumentation, hydraulics, chemical processing, boilers, heat exchangers, aerospace components, automotive manufacturing, electronics, petroleum exploration, rail transit, shipbuilding, commercial HVAC systems, solar thermal installations, and high-pressure water heaters.
In modern industrial design and highly corrosive settings, traditional stainless steel often requires enhanced aesthetic qualities or specific surface modifications to resist pitting and ultraviolet degradation. Modern coloring technologies do not rely on pigments or dyes. Instead, they manipulate the optical properties of the steel's native surface layer.
Unlike organic coatings that degrade under thermal or mechanical stress, industrial color stainless steel uses the principle of light interference. By immersion in an electrochemical bath of hot chromic and sulfuric acids, the native chromium oxide (Cr₂O₃) passive layer is grown under controlled parameters. This transparent oxide layer refracts light waves. When light reflects off the boundary between the oxide film and the base steel, it interferes with light reflecting off the outer surface. Varying the film thickness from 50 to 300 nanometers generates distinct wavelengths of light, producing colors such as bronze, gold, red, blue, green, and black.
For high-wear environments, Physical Vapor Deposition (PVD) is applied inside high-vacuum chambers. The process involves vaporizing solid metals—such as titanium, zirconium, or chromium—using an electric arc. When mixed with reactive gases (nitrogen, oxygen, or carbon-containing gases), it deposits a thin ceramic compound (like TiN, ZrN, or TiAlN) onto the stainless steel. This method produces high surface hardness, low friction coefficients, and excellent wear resistance while maintaining the underlying metallic texture.
| Coloration Technology | Typical Coating Thickness | Surface Hardness (HV) | Primary Degradation Resistance | Key Industrial Application |
|---|---|---|---|---|
| Electrochemical Oxidation | 50 - 300 nm | 220 - 250 HV | Corrosion, Atmospheric Oxidation | Architectural cladding, HVAC grilles |
| PVD Titanium Plating | 0.3 - 1.5 μm | 1,800 - 2,200 HV | Abrasive Wear, UV Radiation | Biomedical, Precision tooling |
| Chemical Anodizing | 100 - 500 nm | 300 - 450 HV | Salt Spray, Chemical Attacks | Marine fittings, Aerospace tubing |
Liaocheng Sihe's production lines integrate manufacturing stages from melt stock selection to final quality testing. Operating within a tightly managed industrial hub in Shandong, China, our factory secures stable access to raw materials and energy, helping to mitigate supply chain disruptions for international contracts.
Our coiled tubing is available in outer diameters ranging from 0.125 inches (3.175 mm) to 1.0 inch (25.4 mm), with wall thicknesses up to 0.165 inches (3.0 mm). To facilitate continuous umbilical manufacturing for subsea oil and gas extraction, we supply seamless and welded coils in continuous lengths up to 32,800 feet (10,000 meters) without orbital welds. This reduces potential leak points in deepwater configurations.
Our facility utilizes in-line bright annealing technology. Under a controlled protective atmosphere of hydrogen and nitrogen, the stainless steel tubing is heat-treated to dissolve carbides and relieve cold-working stresses without exposing the metal to oxygen. This process yields a clean, highly reflective mirror-like finish, which serves as a consistent base for secondary chemical coloration or PVD processing.
Custom engineering solutions tailored to precise mechanical and geometric requirements.
We process various corrosion-resistant materials (including 304, 316L, and Duplex 2205) in diameters ranging from 6.35 mm to 19.05 mm, tailored to specific wall thicknesses and structural parameters.
Our manufacturing extends to precision bending, spiral coiling, and cold drawing. These operations are calibrated for heat exchangers and condensers, preventing wall thinning along outer bend radii.
We provide automated laser cutting, mechanical abrasive cutting, and orbital flame cutting. Our straightening processes maintain tight dimensional limits, facilitating seamless automated assembly.
Our treatment options include mechanical polishing (up to 800 grit), chemical passivation, and electro-polishing. These processes remove free iron contaminants and optimize the protective chromium-oxide layer.
We perform end-flanging, expanding, and swaging of stainless steel tubes. These connections are tailored for automotive exhaust systems, high-pressure chemical transfer pipelines, and precision instrumentation joints.
Our quality verification processes include hydrostatic trials, eddy current inspections, pneumatic underwater leak tests, flaring and flattening assessments, micro-hardness charting, tensile strength profiling, and intergranular corrosion tests.
Our high-performance alloy tubes and sheets are deployed across critical global industries.
Every shipment is backed by verified test certificates, heat number traceability, and international approvals.
Key technical queries resolved regarding standards, production capabilities, and delivery protocols.
Our prices are subject to change depending on alloy surcharges, raw material supply, 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. For specific distribution arrangements or custom development contracts, please contact our engineering division to negotiate appropriate minimum runs.
Yes, we provide comprehensive documentation, including Certificates of Analysis (CoA) conforming to EN 10204 3.1/3.2, Mill Test Reports (MTR), third-party hydrostatic and eddy current certificates, export customs declarations, insurance policies, and certificates of origin.
For pre-production testing samples, the average lead time is approximately 7 days. For mass production runs, the standard lead time is 20 to 30 days upon receipt of the deposit. Lead times commence when we have received your deposit and final technical drawing approval.
We accept payments to our corporate bank account, Western Union, or PayPal. Our standard terms are a 30% deposit in advance, with the remaining 70% balance paid against the presentation of the Bill of Lading (B/L) copy.
We warrant our materials and workmanship to the standards specified in the purchase contract. Our quality commitment covers the replacement or repair of any materials found to have surface or dimensional defects upon inspection.
Yes, we utilize reinforced steel framing, wooden crates, and anti-corrosive plastic wrapping for sea freight. High-precision coiled tubing and capillary tubes are packed in robust, moisture-sealed cases to protect the bright annealed finish from saline air.
Shipping costs depend on the delivery terms chosen (FOB, CIF, CFR, or DDP) and the volume of the shipment. Express courier is fastest for small samples but carries higher costs. Ocean freight is recommended for volume runs. Exact freight rates are calculated based on weight, dimensions, and port of destination.
Explore our diverse selection of stainless steel coils, tubing, plates, and custom profiles.
Duplex 2205 stainless steel is a nitrogen-enhanced alloy designed for high-stress applications.
Our 1/2-inch stainless steel coiled tubing is coiled to custom lengths for hydraulic systems.
Grade 310 provides excellent oxidation resistance under high temperatures.
Select options for specialized piping systems, coils, and structural plates.
