Manufactured to ASTM A106 (seamless carbon steel tubes for high-temperature service) and EN 10305 (precision steel tubes for mechanical and general engineering purposes) standards, it is produced via a two-step process: hot extrusion (to create rough tube blanks) followed by cold drawing (for dimensional precision) and precision machining (to refine surfaces). Carbon content ranges from 0.08% to 0.25%: 0.08-0.15% (low carbon, ideal for deep drawing and welding) and 0.16-0.25% (medium carbon, for higher strength in hydraulic systems)—balancing strength and machinability to avoid tool wear during fabrication.
Dimensional Precision: Achieves outer diameter (OD) tolerance of ±0.02mm (monitored via laser micrometry during cold drawing) and wall thickness tolerance of ±0.01mm (verified via ultrasonic thickness testing). This ensures compatibility with precision fittings (e.g., compression fittings, threaded connections) and consistent flow rates (variation ≤2% across tube lengths).
Mechanical Strength: Delivers tensile strength of 415-590 N/mm² and yield strength of ≥240 N/mm² (per ASTM A370 testing), with excellent low-temperature impact toughness: Charpy V-notch impact energy ≥27J at -20℃ (meeting EN 10273 standards). This makes it suitable for cold-climate applications (e.g., outdoor hydraulic lines in Canada, Scandinavia).
Surface Quality: Cold-drawn finish (Ra ≤ 1.6μm, achieved via polished drawing dies) eliminates surface defects (e.g., scratches, pits) that cause seal wear (extending O-ring life by 30%) and fluid turbulence (reducing pressure drop by 5% vs. rough-surface tubes). For critical applications (e.g., instrumentation lines), an additional electrochemical polishing step (Ra ≤ 0.8μm) is available.
Weldability: Low carbon equivalent (CE ≤0.45%, calculated via IIW formula) enables defect-free welding without preheating—compatible with common industrial welding methods (MIG, TIG, stick welding). Post-weld heat treatment (PWHT) is only required for thick-walled tubes (>10mm) in high-pressure applications.
Hydraulic Systems: High-pressure lines in construction machinery (e.g., excavator arm hydraulics) and agricultural equipment (e.g., tractor loaders), where medium-carbon variants (0.20-0.25% C) tolerate operating pressures up to 35 MPa (5,000 psi) without bursting.
Mechanical Engineering: Piston rods and cylinder barrels in heavy equipment (e.g., mining trucks), where dimensional precision (OD tolerance ±0.02mm) ensures smooth piston movement and minimal oil leakage (reducing hydraulic fluid consumption by 10% annually).
Instrumentation: Process measurement lines in petrochemical plants (e.g., pressure transmitter impulse lines), where small diameters (6-12mm OD) and tight tolerances ensure accurate pressure/temperature readings (measurement error ≤0.5% of full scale).
Automotive Manufacturing: Drive train components (e.g., transmission oil cooler lines) and suspension systems (e.g., shock absorber tubes), where low-carbon variants (0.08-0.12% C) are easily bent into complex shapes and welded to other components.
Q: What is the maximum length for custom orders?
A: Standard lengths up to 12 meters (easily transportable via standard trucks), with custom lengths up to 24 meters available via special order (for large-scale hydraulic systems, e.g., offshore cranes). Custom lengths are cut using laser or plasma cutting (cut perpendicularity ≤0.1mm/m) to ensure flat, weld-ready ends.
Q: Can it be used with corrosive fluids?
A: Uncoated tubes resist mild corrosion (e.g., mineral oils, water-glycol coolants) but are not suitable for strong corrosives (e.g., acids, saltwater). For harsh fluids, specify zinc-plated (10-20μm zinc coating, 500+ hours salt spray resistance) or epoxy-coated (20-30μm epoxy layer, chemical resistance to pH 4-10) variants—extending service life by 2-3x.
Q: How is dimensional accuracy verified?
A: Each tube undergoes three quality checks before shipment: 1) Laser micrometry (measuring OD at 10 points per meter to ensure tolerance), 2) Ultrasonic thickness testing (verifying wall thickness uniformity), and 3) Air leak testing (at 1.5x maximum operating pressure) to ensure leak-proof integrity. Test reports (per ISO 10204 3.1) are provided upon request for critical applications.
Manufactured to ASTM A106 (seamless carbon steel tubes for high-temperature service) and EN 10305 (precision steel tubes for mechanical and general engineering purposes) standards, it is produced via a two-step process: hot extrusion (to create rough tube blanks) followed by cold drawing (for dimensional precision) and precision machining (to refine surfaces). Carbon content ranges from 0.08% to 0.25%: 0.08-0.15% (low carbon, ideal for deep drawing and welding) and 0.16-0.25% (medium carbon, for higher strength in hydraulic systems)—balancing strength and machinability to avoid tool wear during fabrication.
Dimensional Precision: Achieves outer diameter (OD) tolerance of ±0.02mm (monitored via laser micrometry during cold drawing) and wall thickness tolerance of ±0.01mm (verified via ultrasonic thickness testing). This ensures compatibility with precision fittings (e.g., compression fittings, threaded connections) and consistent flow rates (variation ≤2% across tube lengths).
Mechanical Strength: Delivers tensile strength of 415-590 N/mm² and yield strength of ≥240 N/mm² (per ASTM A370 testing), with excellent low-temperature impact toughness: Charpy V-notch impact energy ≥27J at -20℃ (meeting EN 10273 standards). This makes it suitable for cold-climate applications (e.g., outdoor hydraulic lines in Canada, Scandinavia).
Surface Quality: Cold-drawn finish (Ra ≤ 1.6μm, achieved via polished drawing dies) eliminates surface defects (e.g., scratches, pits) that cause seal wear (extending O-ring life by 30%) and fluid turbulence (reducing pressure drop by 5% vs. rough-surface tubes). For critical applications (e.g., instrumentation lines), an additional electrochemical polishing step (Ra ≤ 0.8μm) is available.
Weldability: Low carbon equivalent (CE ≤0.45%, calculated via IIW formula) enables defect-free welding without preheating—compatible with common industrial welding methods (MIG, TIG, stick welding). Post-weld heat treatment (PWHT) is only required for thick-walled tubes (>10mm) in high-pressure applications.
Hydraulic Systems: High-pressure lines in construction machinery (e.g., excavator arm hydraulics) and agricultural equipment (e.g., tractor loaders), where medium-carbon variants (0.20-0.25% C) tolerate operating pressures up to 35 MPa (5,000 psi) without bursting.
Mechanical Engineering: Piston rods and cylinder barrels in heavy equipment (e.g., mining trucks), where dimensional precision (OD tolerance ±0.02mm) ensures smooth piston movement and minimal oil leakage (reducing hydraulic fluid consumption by 10% annually).
Instrumentation: Process measurement lines in petrochemical plants (e.g., pressure transmitter impulse lines), where small diameters (6-12mm OD) and tight tolerances ensure accurate pressure/temperature readings (measurement error ≤0.5% of full scale).
Automotive Manufacturing: Drive train components (e.g., transmission oil cooler lines) and suspension systems (e.g., shock absorber tubes), where low-carbon variants (0.08-0.12% C) are easily bent into complex shapes and welded to other components.
Q: What is the maximum length for custom orders?
A: Standard lengths up to 12 meters (easily transportable via standard trucks), with custom lengths up to 24 meters available via special order (for large-scale hydraulic systems, e.g., offshore cranes). Custom lengths are cut using laser or plasma cutting (cut perpendicularity ≤0.1mm/m) to ensure flat, weld-ready ends.
Q: Can it be used with corrosive fluids?
A: Uncoated tubes resist mild corrosion (e.g., mineral oils, water-glycol coolants) but are not suitable for strong corrosives (e.g., acids, saltwater). For harsh fluids, specify zinc-plated (10-20μm zinc coating, 500+ hours salt spray resistance) or epoxy-coated (20-30μm epoxy layer, chemical resistance to pH 4-10) variants—extending service life by 2-3x.
Q: How is dimensional accuracy verified?
A: Each tube undergoes three quality checks before shipment: 1) Laser micrometry (measuring OD at 10 points per meter to ensure tolerance), 2) Ultrasonic thickness testing (verifying wall thickness uniformity), and 3) Air leak testing (at 1.5x maximum operating pressure) to ensure leak-proof integrity. Test reports (per ISO 10204 3.1) are provided upon request for critical applications.
