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Seamless high precision cold rolled tube is a premium tubular product engineered for applications demanding extreme dimensional accuracy, smooth surface finish, and consistent mechanical properties. Manufactured from materials like carbon steel (e.g., ASTM A106), stainless steel (304/316L), and alloy steel (4130), the tube undergoes multiple cold-rolling passes with mandrel stretching to achieve OD tolerances as tight as ±0.025 mm and wall thickness tolerances of ±1%. Compliant with standards like ASTM A213 (stainless) and EN 10305-1 (carbon steel), it features a homogenous microstructure free of internal defects.
The cold-rolling process enhances surface hardness (up to 30% increase in yield strength) while maintaining excellent ductility, making it ideal for high-precision fluid systems.
Extreme Dimensional Precision: Offers OD/ID concentricity ≤0.05 mm and straightness ≤0.1 mm/m, critical for applications like hydraulic actuators and precision instruments.
Superior Surface Finish: Internal/external surface roughness (Ra ≤0.4 μm) reduces fluid friction and prevents particle accumulation, essential for high-purity systems.
Enhanced Mechanical Properties: Cold work increases tensile strength (e.g., 316L cold rolled: 700 MPa vs. 500 MPa annealed) while maintaining elongation >30%.
Material Versatility: Available in carbon steel (for general structural use), stainless steel (corrosion resistance), and exotic alloys (Inconel 625 for extreme environments), with wall thicknesses ranging 0.5-10 mm.
Aerospace Hydraulics: Used in aircraft flight control systems, landing gear tubing, and fuel lines requiring leak-free performance at 3000+ PSI.
Medical Equipment: Ideal for surgical instrument shafts, endoscope tubes, and dialysis machine lines, meeting ISO 13485 cleanliness standards.
Semiconductor Manufacturing: Employed in ultra-high-purity gas delivery systems (e.g., silicon wafer fabrication), resisting particle contamination and corrosive gases.
Industrial Automation: Used in robotic arm hydraulics, CNC machine tool pipelines, and precision lubrication systems requiring minimal pressure drop.
Q: What is the difference between cold rolled and hot rolled tubes?
A:Cold rolled tubes have tighter tolerances (±0.025 mm vs. ±0.5 mm for hot rolled), better surface finish, and higher strength but are more expensive due to additional processing.
Q: Can precision tubes be welded?
A:Yes, using GTAW or laser welding with careful heat input control to avoid dimensional distortion; post-weld straightening may be required for critical applications.
Q: How are surface contaminants removed?
A:Passivation (stainless steel) or degreasing (carbon steel) processes are used, with final inspection via eddy current testing to ensure defect-free surfaces.
Q: What is the minimum bend radius for these tubes?
A:Typically 2-3x OD for stainless steel and 1.5-2x OD for carbon steel, depending on wall thickness; mandrel bending is recommended for tight radii to prevent ovality.
