Sihe Steel
Sihe Steel
Explore our industrial range of high-alloy, precision-engineered, and certified seamless coiled pipelines and specialty sheets.
304 stainless steel is the premier austenitic chromium-nickel alloy utilized extensively across global industrial networks. Designed to operate in moderate to highly corrosive environments, its chemical architecture offers the perfect balance of yield strength, ductility, and sensitization resistance.
Liaocheng Sihe Stainless Steel Material LTD operates six specialized precision production lines, manufacturing seamless coiled tubes using cold drawing and cold pilgering processes. Our focus is to support international procurement needs for ultra-long coiled configurations, removing mechanical orbital joints to maximize structural integrity in high-pressure installations.
Our material complies with global standards including ASTM A269, ASTM A213, ASME SA213, JIS G3459, and EN 10216-5. These standards dictate exact chemical limits and testing procedures that guarantee long-term operation under structural stress.
In-depth technical properties for 304/304L, 316L, 321, 317L, 309S, 310S, and Duplex Alloys
| Alloy Grade | UNS Designator | Cr (%) | Ni (%) | Mo (%) | C (Max %) | Yield Strength (MPa) | Tensile Strength (MPa) |
|---|---|---|---|---|---|---|---|
| 304 Stainless Steel | S30400 | 18.0 - 20.0 | 8.0 - 10.5 | - | 0.08 | ≥ 205 | ≥ 515 |
| 304L (Low Carbon) | S30403 | 18.0 - 20.0 | 8.0 - 12.0 | - | 0.03 | ≥ 170 | ≥ 485 |
| 316L (Acid Resistant) | S31603 | 16.0 - 18.0 | 10.0 - 14.0 | 2.0 - 3.0 | 0.03 | ≥ 170 | ≥ 485 |
| Duplex 2205 | S31803 / S32205 | 22.0 - 23.0 | 4.5 - 6.5 | 3.0 - 3.5 | 0.03 | ≥ 450 | ≥ 620 |
| Incoloy 825 | N08825 | 19.5 - 23.5 | 38.0 - 46.0 | 2.5 - 3.5 | 0.05 | ≥ 240 | ≥ 585 |
| Inconel 625 | N06625 | 20.0 - 23.0 | ≥ 58.0 | 8.0 - 10.0 | 0.10 | ≥ 415 | ≥ 827 |
Addressing the critical supply, engineering, and logistics requirements of industrial buyers worldwide.
Engineered to reach lengths up to 32,800 feet (10,000 meters) on a single spool. This configuration minimizes connections and downhole leakage risks for deepwater subsea control umbilicals.
Processed under pure hydrogen gas atmospheres. This prevents surface scaling and maintains structural malleability, ensuring consistent bendability in hydraulic piping systems.
We process highly resilient chemistries including Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625 to provide long-term protection in sour gas wells.
Liaocheng Sihe Stainless Steel Material LTD designs and fabricates high-performance coiled piping systems for key global industries:
Providing chemical injection lines and hydraulic control networks that must operate under high external pressures in corrosive, sour fluid wells.
Seamless coiled tubes allow engineers to design compact heat-transfer packages, eliminating weld seams to reduce thermal cycle stress fractures.
Polished, clean internal surfaces prevent particulate accumulation and moisture outgassing in microelectronics manufacturing lines.
Tailored processing techniques providing value-added solutions for specific global industrial needs.
CNC bending processes matching customer engineering drawings. This supports spiral heating elements and compact cooling jacket applications.
Utilizing high-speed orbital cut-offs and precision laser cutting to deliver clean, burr-free end profiles matching design tolerances.
Specialized processing for direct integration with dual-ferrule compression fittings or custom flange assemblies in hydraulic pipelines.
Providing custom-engineered stainless steel configurations across varied processing environments.
Maximizes heat-transfer efficiency by utilizing long seamless tubes to minimize potential points of leakage.
Designed for containment of modern high-pressure refrigerants in commercial heat pump systems.
Engineered to handle acidic and caustic media transport lines at elevated processing temperatures.
High cleanliness levels, smooth internal surfaces, and passivation treatment prevent bio-fouling.
Clean, certified tubing profiles designed to support critical process piping and clean utilities.
High-integrity instrumentation and control piping systems for modern power generation loops.
Ensuring reliable operation under harsh processing environments requires systematic, nondestructive testing of every coil before shipment.
We perform 100% pneumatic testing and pressure tightness testing on all production runs. For extreme offshore control systems, our pipes undergo hydrostatic pressure testing at pressures configured to match design limits.
Additional quality control tests include:
Our production workflows conform to strict international standards. View our quality certifications below.
Developing high-alloy structures to withstand harsh processing environments.
Our engineering research focuses on optimizing Pitting Resistance Equivalent Numbers (PREN) for critical tubing grades. We are refining our continuous extrusion and drawing lines to increase the delivery lengths of high-alloy materials, reducing the need for field welding in offshore operations.
Additionally, we work with custom titanium-stabilized grades (such as 321) and high-carbon variants designed to maintain mechanical properties in high-temperature heat exchangers and industrial furnace networks.
Direct supply paths for key industrial configurations manufactured in our facility.
Seamless coiled tubing in sizes ranging from 0.125" (3.175mm) to 1" (25.4mm) OD. Built to withstand high temperatures and pressures.
Precision-drawn capillary tubes designed for instrumentation systems, sensors, and micro-fluidic handling networks.
Designed for optimized thermal transfer and mechanical strength in heating and cooling applications.
Complete your layout with our high-grade precision piping and structural plates.
Essential technical information for engineering and procurement professionals.