Sihe Steel
Sihe Steel
Explore our engineered structural piping, coiled solutions, and precision tubes ready for distribution
ASTM A213 standard covers seamless ferritic and austenitic alloy steel boiler, superheater, and heat-exchanger tubes. Grade TP316L, representing low-carbon molybdenum-bearing austenitic stainless steel, is the industry benchmark for high-corrosive and elevated temperature environments. The reduced carbon weight content (maximum 0.035%) protects against sensitization and intergranular corrosion during welding, while the 2.0% - 3.0% Molybdenum addition provides exceptional pitting resistance in chloride environments.
Global procurement sectors demand strict compliance with dimensional control, grain structure distribution, and mechanical parameters. High-purity process lines, petrochemical systems, and downhole hydraulic circuits rely on the absolute structural stability of seamless cold-drawn tubes. As global infrastructure transitions to deeper offshore oil & gas extraction and high-purity chemical processing, sourcing ASTM A213 TP316L tubes with verified trace certificates is essential for operations longevity.
Understanding the chemistry is key to calculating pitting resistance equivalent numbers (PREN) and structural weld limits:
| Element | Spec Percentage (Wt%) |
|---|---|
| Carbon (C) | ≤ 0.035% |
| Chromium (Cr) | 16.00% - 18.00% |
| Nickel (Ni) | 10.00% - 14.00% |
| Molybdenum (Mo) | 2.00% - 3.00% |
| Manganese (Mn) | ≤ 2.00% |
| Silicon (Si) | ≤ 0.75% |
| Phosphorus (P) | ≤ 0.045% |
| Sulfur (S) | ≤ 0.030% |
Liaocheng Sihe Stainless Steel Material LTD operates 6 state-of-the-art production lines to provide tailored specifications
Outer diameters ranging from 0.125 inch (3.175 millimeters) to 1 inch (25.4 millimeters). Wall thicknesses are engineered up to 0.165 inch (3 millimeters). Continuous single-coil lengths up to 32,800 feet (10,000 meters) are manufactured without orbital joints.
Apart from our premier Austenitic 316L, our metallurgy catalog spans across 304/304L, 321, 317L, 309S, 310S, INCOLOY 800, Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625.
Production is aligned strictly to global manufacturing specifications including ASTM A213, ASTM A312, ASME SB213, GB/T 14976, JIS G3459, and EN 10216-5, supporting safety configurations in dynamic plant designs.
Providing engineered fluid networks, heat transfer solutions, and structural tubing systems across demanding industrial sectors
High structural strength and high thermal conductivity tubes are critical for continuous cycles in energy plants and heavy processing utilities.
Outstanding protection against aggressive acids and high-temperature cracking, ensuring zero chemical leakage and minimal process downtime.
Ultra-smooth inner diameters (EP options available) minimize product contamination and prevent biological build-up.
As oil and gas extraction moves into deeper and harsher waters, subsea environments demand the highest safety margins. Operating at subsea depths requires umbilical lines to withstand hydrostatic pressures and corrosive seawater. Our specialized corrosion-resistant materials for coiled umbilical tubes provide reliable hydraulic control and chemical injection routes for offshore systems.
Liaocheng Sihe is committed to providing material integrity to reduce subsea component failures, maintaining safe operations in offshore deepwater oil fields worldwide.
Liaocheng Sihe Stainless Steel Material LTD is a leading manufacturer specializing in stainless steel coiled tubes, stainless steel polishing tubes, and seamless coiled tubing. Backed by over a decade of production history, we have established continuous manufacturing lines for extra-long coils.
Our factory features world-class online bright annealing technology. This inert gas-shielded heat treatment operates at temperatures over 1040°C, softening the tube online to improve elongation and eliminate surface oxidation, removing the need for traditional acid pickling. Additionally, our processing capabilities support custom requirements, including precise cutting, orbital splicing, customized flanging, and pre-bent configurations.
We export to over 30 countries and regions, including the US, Germany, Spain, South America, Southeast Asia, the Middle East, and Eastern Europe, with 80% of our production dedicated to international markets.
Every shipment is verified under strict international protocols to ensure high-pressure performance and material trace traceability
To comply with ASTM A213 TP316L requirements, our factory performs destructive and non-destructive testing at each processing stage:
We maintain certified management and production processes to ensure our products meet international standards, allowing us to supply challenging projects globally.
Tailoring raw materials into precision-engineered solutions for immediate deployment on site
Supports various materials (e.g., 304, 316L, 2205) and specifications (diameter 6.35mm to 19mm) for stainless steel coils.
Precision winding, spiral forming, coiling, and shape configuration optimized for heat exchangers and compact setups.
Utilizing high-precision laser cutting, mechanical deburring, and straightening machines to achieve strict dimensional tolerances.
Precise end-forming, including flanging and beveling, designed for connections in automotive exhaust systems and chemical pipelines.
The demand for performance limits in piping materials is shifting rapidly. The green energy transition, particularly the hydrogen economy, requires materials resistant to hydrogen embrittlement. While standard grades perform well in conventional setups, future applications are moving toward higher alloy content and ultra-high purity (UHP) gas lines. Liaocheng Sihe is adapting our manufacturing processes to meet these changing industry specifications.
Additionally, deep-sea exploration and high-temperature waste heat recovery systems require tubing materials that resist scaling and localized corrosion. We are continuing research into duplex grades, including Duplex 2205 and Super Duplex 2507, alongside nickel alloys like Inconel 625. Our development focus remains on refining manufacturing processes to support reliable and efficient energy systems.
Combines austenitic and ferritic properties for double the yield strength of standard steels.
High Cr/Mo alloy content designed to resist chloride stress corrosion cracking.
Nickel-based alloys engineered for high-temperature oxidation and acid resistance.
Answers to technical and logistics questions commonly asked by procurement departments and engineering teams
Browse our selection of specialized capillary tubes and heat exchanger piping options
