Sihe Steel
Sihe Steel
Direct from China's leading mill manufacturer. Certified to ASTM, ASME, JIS, and EN standards with advanced online bright annealing technology.
High-quality wholesale ferritic stainless steel plate and sheet pricelist & instant quotes.
View Details
0.049" wall thickness precision seamless coiled tubing from certified Chinese suppliers.
View Details
Strictly manufactured DIN standard welded pipes for chemical and structural industries.
View Details
Corrosion-resistant marine grade wholesale sheets and plates directly from China.
View Details
Affordable ferritic grade welded pipes. Get latest quotes and bulk order discount price lists.
View Details
High strength and exceptional pitting resistance for severe offshore environments.
View Details
Austenitic alloyed pipes optimized for high-temperature and acidic operations.
View Details
Continuous length duplex coils for subsea control lines and chemical injection lines.
View DetailsAn in-depth analysis of processing techniques, metallurgical integrity, and localized application frameworks.
Liaocheng Sihe Stainless Steel Material LTD is an industry-leading manufacturer with over ten years of historical expertise in producing high-performance stainless steel coiled tubes, capillary tubes, and custom polished heat exchanger piping. Operating three specialized coil-drawing lines and a total of six continuous structural processing lines, we strictly govern our operations according to GB, ASTM, ASME, JIS, and EN international standards.
We work with an expansive portfolio of materials, including standard austenitic grades (304, 304L, 316L, 321, 317L, 309S, 310S), duplex/super duplex alloys (Duplex 2205, Super Duplex 2507), and nickel-based superalloys (Incoloy 800, Incoloy 825, Inconel 625). Our key metallurgical distinction lies in the integration of world-class, online bright annealing technology, which ensures that all long-length tubes maintain a clean, oxidation-free inside diameter (ID) and outside diameter (OD).
Type 304 (UNS S30400) is the foundational alloy of the austenitic family, formulated with a minimum of 18% chromium and 8% nickel. The polishing process does not merely enhance visual shine; it actively alters the surface topography of the tube. Industrial polishing removes microscopic stress-concentration zones, mechanical fissures, and scaling, which could otherwise act as focal points for crevice corrosion or pitting in aggressive environments.
Our polishing processes achieve a high level of uniformity, resulting in specific roughness (Ra) values that meet stringent sanitary and industrial requirements. Polished 304 tubes exhibit a smooth boundary layer that limits fluid turbulence and inhibits biological biofilm adhesion, making them highly suitable for hygienic fluid transport systems.
How direct supply chain integration and precision testing systems generate value for global procurement.
By processing tubes in a controlled hydrogen/nitrogen atmosphere at temperatures exceeding 1040°C, we prevent structural oxidation and eliminate the need for acid pickling, preserving a clean surface finish.
We execute standard testing regimens: 100% hydrostatic and pneumatic checks, drift expansion, tensile testing, flattening, hardness verifications, and online eddy-current non-destructive inspection.
Offering continuous lengths up to 32,800 feet (10,000 meters). This reduces the need for orbital orbital welds, minimizing potential leak points in subsea umbilicals and control lines.
Understanding the relationship between dimensional sizing, raw material markets, and processing costs.
| Dimensional Range (OD) | Wall Thickness (WT) | Standard Conformity | Surface Finish Class | Typical Applications |
|---|---|---|---|---|
| 0.125" to 0.500" (3.175 - 12.7 mm) | 0.020" to 0.049" (0.5 - 1.25 mm) | ASTM A269 / ASTM A213 | Bright Annealed (BA) / Grit 320 | Capillary Instrumentation, HVAC, Chromatography |
| 0.500" to 1.000" (12.7 - 25.4 mm) | 0.035" to 0.165" (0.89 - 4.19 mm) | ASTM A269 / JIS G3459 | Mechanical Polishing (Grit 400) | Heat Exchangers, Hydraulic Lines, Solar |
| Custom Coils (up to 10,000m) | Up to 0.165" (3.0 mm) | ASME SA213 / EN 10216-5 | Electropolished (EP) / BA | Offshore Umbilicals, Chemical Injection |
The final price of polished 304 stainless steel tubing is shaped by four primary factors:
Liaocheng Sihe offers specialized fabrication services tailored for challenging operating conditions.
Supports various materials (e.g., 304, 316L, 2205) and specifications (diameter 6.35mm to 19.05mm) for coiled tubing configurations.
Includes high-precision bending, spiral forming, cold drawing, and customized coils optimized for heat exchanger installations.
Employs laser cutting, mechanical abrasive cutting, and automated flame cutting to ensure tight length tolerances.
Dedicated to developing advanced polishing techniques (electro-polishing, mechanical polishing, and mirror treatments).
Commonly applied for connections in automotive exhaust systems, chemical transport pipelines, and precision instrumentation fittings.
Liaocheng Sihe maintains ISO-certified QA/QC procedures. Our products have been exported to over 30 countries.
Our processing facility utilizes advanced drawing lines and bright annealing technology. The plant is equipped with testing instrumentation to verify alloy composition, wall integrity, and finish tolerances.
A strategic guide for corporate procurement managers evaluating Chinese manufacturers.
Navigating direct factory sourcing in China involves evaluating manufacturing capacities, transit timelines, and testing compliance. Buying directly from mills like Liaocheng Sihe helps reduce intermediary markup fees. Our proximity to key transportation networks allows us to optimize export shipping arrangements for high-volume orders.
We work to lower supply risks by using specialized export packaging for long-distance transport. Coiled tubing is wound on reinforced wooden or steel drums, wrapped in protective plastic, and braced inside containers. We also manage structural validation (PMI, ultrasonic, and eddy-current testing) to ensure compliance with import standards.
Expert clarifications regarding technical requirements, orders, pricing models, and shipping procedures.
Our prices are subject to change depending on raw material supply, processing requirements, 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 or procure in smaller quantities, please contact our sales team to discuss available stock alternatives.
Yes, we can provide comprehensive documentation, including Certificates of Analysis/Conformance, Mill Test Certificates (MTC) to EN 10204 3.1, cargo insurance, Certificates of Origin, and standard export documentation.
For samples, the lead time is about 7 days. For mass production, the lead time is 20-30 days after receiving the deposit payment. Lead times become effective when we receive your deposit and final product approval. If our schedule does not match your deadline, please discuss your requirements with your sales representative.
Payments can be made via direct wire transfer (T/T), Western Union, or PayPal: a 30% deposit is required in advance, and the remaining 70% balance is payable against the copy of the Bill of Lading (B/L).
We warranty both our raw materials and our fabrication workmanship. Our primary commitment is to resolve any customer issues and ensure satisfaction, whether under warranty or post-warranty periods.
We use high-quality, reinforced packaging designed for export. When required, we arrange specialized packaging for hazardous goods or temperature-sensitive shipping. Custom packaging requirements may incur additional charges.
Shipping fees depend on the selected transport method. Express shipping is fast but carries higher rates, while ocean freight is generally the most economical choice for bulk quantities. We calculate detailed freight quotes based on order weight, dimensions, and the destination port.
Explore our full range of processing options, from custom sheet metal to specialized heat exchanger tubing.
Direct mill pricing for standard 304 cold-rolled coils and high-finish sheets.
View Details
Titanium-stabilized austenitic steel sheet. Resistant to intergranular carbide precipitation.
View Details
Molybdenum-bearing formulation designed for marine environments and chemical processing.
View Details
Economical polished tubes with controlled mechanical processing for structural applications.
View Details
Martensitic stainless steel sheets offering high hardness and wear resistance.
View Details
High-temperature resistant alloy tubing designed for heat exchangers and furnace parts.
View Details
Duplex stainless steel pipe providing high structural strength and resistance to stress corrosion cracking.
View Details
Precision-welded 202 pipes suitable for structural applications and light chemical exposure.
View Details