Sihe Steel
Sihe Steel
Explore our foundational range of precision stainless steel coiled tubes, capillary tubes, and heat exchanger pipes engineered for high-stress infrastructure.
A comprehensive examination of metallurgical properties, structural applications, and market movements.
Grade 316 stainless steel represents the gold standard for corrosive chemical environments, subsea operations, and sterile pharmaceutical systems. The primary differentiator between Grade 316 and the more common Grade 304 lies in the addition of Molybdenum (Mo), typically in the range of 2.0% to 3.0%. This chemical modification significantly enhances the material's resistance to pitting and crevice corrosion in chloride-rich environments.
The metallurgical formulation of Grade 316 grants it a much higher Pitting Resistance Equivalent Number (PREN), calculated via:
PREN = %Cr + 3.3 * %Mo + 16 * %N
While Grade 304 achieves a PREN score of approximately 19, Grade 316 typically yields values above 23, making it the minimum requirement for maritime architectures and heavy-duty chemical process equipment.
For welded structural architectures, 316L (Low Carbon) is preferred over standard 316. By capping the carbon threshold at 0.03%, carbon precipitation during the welding process is mitigated, preventing localized sensitization and subsequent intergranular corrosion. This ensures long-term lifecycle performance in marine and process-heavy piping frameworks.
Globally, the demand for high-integrity stainless steel sheet and coil structures is shifting towards tighter manufacturing tolerances and cleaner surfaces. Key macro-trends driving the engineering community include:
As a leading manufacturer, Liaocheng Sihe Stainless Steel Material LTD addresses these needs by integrating state-of-the-art Bright Annealing (BA) processes, allowing online material restructuring under fully controlled atmospheric conditions, resulting in an oxide-free, bright mirror-like surface.
Your Trusted Global OEM & ODM Manufacturing Partner for High-Integrity Alloys.
Liaocheng Sihe Stainless Steel Material LTD is a leading expert in the production of high-performance stainless steel coiled tubes, polishing tubes, seamless coiled tubing, and premium sheet metal developments. Strictly conforming to international manufacturing norms—including GB, ASTM, ASME, JIS, and EN—we enforce zero-tolerance quality assurance at every stage of the melt, draw, and extrusion phases.
Our raw material compatibility spans premium grades: 304/304L, 316L, 321, 317L, 309S, 310S, and INCOLOY 800, alongside high-performance specialty steels such as Austenitic 316L, Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625.
As offshore extraction migrates into deeper and harsher waters, our specialized work focuses on providing corrosion-resistant materials for umbilical coiled tubing. Standard diameters range from 0.125 inch (3.175 mm) to 1 inch (25.4 mm), with wall thicknesses up to 0.165 inch (3 mm) and continuous spooled lengths up to 32,800 feet (10,000 meters) without orbital welds.
Precise dimensional parameters and standards followed by Liaocheng Sihe Steel Group.
| Material Class | Common Grades Available | Size Limits (Outer Diameter) | Max Wall Thickness | Testing Methods & Compliance |
|---|---|---|---|---|
| Austenitic Stainless Steel | 304, 304L, 316, 316L, 321, 317L, 309S, 310S | 0.125" (3.175 mm) to 1.0" (25.4 mm) | 0.165" (3.0 mm) | Bright Annealing, Air Tightness, Hydrostatic, Eddy Current |
| Duplex Stainless Steel | Duplex 2205, Super Duplex 2507 | 0.250" (6.35 mm) to 0.750" (19.05 mm) | 0.120" (3.05 mm) | 100% Flaring, Hardness, Yield Strength, Microstructural Analysis |
| High Nickel Alloys | Incoloy 800, Incoloy 825, Inconel 625 | Custom Mill Run Specifications | Up to 0.165" (3.0 mm) | Ultrasonic, Air Tightness, Mechanical Integrity Tests |
*Custom dimensions and material grades are engineered to order. Please contact our technical sales desk for specific layout validation.
Beyond raw production, we offer deep value-added fabrication to deliver ready-to-install components.
Supports diverse specifications for high-integrity materials (Grade 304, 316L, Duplex 2205) and targeted diameters ranging from 6.35mm to 19mm in continuous spooled configurations.
Includes precise engineering applications like helical bending, spiral coil shaping, mechanical precision drawing, and cold-worked optimizations tailored for thermal dynamic heat exchangers.
Utilizes multi-axis laser cutting, clean mechanical shear systems, or thermal parting processes to ensure zero-deformation end faces and ultra-tight length tolerances.
We dedicate engineering resources to developing pristine micro-finishes with state-of-the-art bright annealing, pickling, mechanical polishing, and passivation to maximize corrosion resistance.
End connections engineered for reliable flanging, critical for high-pressure junctions, automotive exhaust manifolds, chemical transport systems, and aerospace fluid control.
Our metals and tubing products serve crucial roles in primary global industries, operating under absolute reliability profiles.
Our facility implements absolute compliance mapping. All components are shipped with EN 10204 3.1 Material Test Reports (MTRs).
Access authoritative answers concerning metal grades, international orders, and processing requirements.
Review our catalog specifications for specialized components and auxiliary tube geometries.
Extended inventory selection including specific alloy sheets, polishing tubes, and high-temp welded pipes for exhaust manifolds.
