Custom-size precision seamless tubes engineered for applications requiring exact dimensional accuracy, high concentricity, and reliable mechanical strength under dynamic loads. Manufactured through precision cold drawing or cold rolling processes, these tubes eliminate longitudinal welds to ensure uniform pressure resistance. Available in tailored outer diameters, inner diameters, and wall thicknesses aligned with specific engineering drawings and international execution standards.
Specifications
|
Parameter |
Specification Range |
|
Outer Diameter (OD) |
6 mm - 350 mm |
|
Wall Thickness (WT) |
0.5 mm - 35 mm |
|
Length |
Fixed length (1 m - 12 m) or random length |
|
Dimensional Tolerance |
Up to ±0.025 mm (depending on size and manufacturing process) |
|
Execution Standards |
ASTM A519, DIN 2391, EN 10305-1, EN 10305-4, JIS G3445 |
|
Surface Finish |
Bright annealed, black, pickled, or oiled |
Material & Manufacturing
Available Material Grades
• Carbon & Alloy Steels: E355 (St52), E235 (St37.4), 1020, 1045, 4140 (42CrMo4), 20MnV6.
• Stainless Steels (Upon Request): TP304/304L, TP316/316L.
Manufacturing Process & In-House Capabilities
• Cold Drawing & Cold Rolling: Multi-pass cold reduction mills control microstructural grain size, achieving strict OD/ID tolerances and smooth surface finishes.
• Controlled Atmosphere Heat Treatment: Inline annealing furnaces eliminate internal residual stresses induced by cold working, preventing post-machining dimensional distortion.
• Straightening & Cutting: Precision multi-roll straightening machines achieve straightness within 0.5 mm / 1000 mm, followed by deburred cold cutting to precise customer lengths.
Quality Inspection & Compliance
Every production batch undergoes rigorous verification to verify compliance with engineering requirements and quality management systems (ISO 9001 / IATF 16949 certified manufacturing):
Dimensional Verification: Laser micrometers and air gauges measure OD, ID, and wall thickness consistency across the entire tube length.
Non-Destructive Testing (NDT): Eddy current testing or ultrasonic testing identifies internal and surface defects.
Mechanical Testing: Tensile strength, yield strength, elongation, and Rockwell/Brinell hardness testing per ASTM/EN standards.
Surface & Metallurgical Analysis: Roughness testing (Ra values down to 0.4 um) and grain size evaluation.
Traceability: EN 10204 3.1 Mill Test Certificates provided with every shipment.
Applications
Hydraulic & Pneumatic Systems: Cylinder barrels requiring high internal pressure ratings and smooth inner surface finishes.
Automotive Components: Steering columns, shock absorber tubes, driveshaft components, and fuel rail tubing.
Industrial Machinery: Roller bearings, precision spindles, bushing sleeves, and high-load structural frames.
Energy & Power Equipment: Instrumentation lines and high-pressure fluid conveyance.
Customization & Supply
Production configured to non-standard metric or imperial sizes without requiring massive mill minimum order quantities (MOQs), supporting prototyping and small-to-medium batch runs.
Custom chamfering, threading, cut-to-length services, protective oil coatings, and plastic cap sealing.
Export-grade bundling with anti-rust woven belts, robust wooden crates, or heavy-duty cardboard tubes designed to withstand international transit.
FAQ
Q: What is the typical MOQ for custom-size precision seamless tubes?
A: Minimum order quantities depend on steel grade and dimensions. To support engineering prototypes and flexible project schedules, smaller trial runs and non-standard custom sizes are accommodated.
Q: What tolerances can be achieved for cold-drawn precision tubes?
A: Depending on dimensions, outer and inner diameter tolerances can be held within ±0.05 mm or tighter (±0.025 mm for specialized sizes) in compliance with EN 10305 standards.
Q: Are Mill Test Certificates provided with shipments?
A: Yes. Every order includes an EN 10204 3.1 Mill Test Certificate detailing chemical composition, mechanical properties, and dimensional inspection results.
Q: Can you supply tubes with internal honing for hydraulic cylinders?
A: Yes. We supply cold-drawn tubes pre-conditioned for honing, or fully honed and roller-burnished tubes meeting H8/H9 inner diameter tolerances and specific Ra surface roughness values.
Q: What is the standard lead time for custom production orders?
A: Standard production takes 3 to 5 weeks, depending on raw material availability and processing complexity. Express scheduling is available for urgent project requirements.
Q: How do you prevent rust during ocean freight to North America or Europe?
A: Tubes are coated with a neutral anti-rust oil, bundled securely with moisture-resistant wrapping, and packed in robust wooden cases or containers lined with desiccants.
Request a Quote
To receive a formal quotation within 24 hours, please provide the following technical details in your inquiry:
• Outer Diameter (OD) and Wall Thickness (WT) or Inner Diameter (ID)
• Material Grade (e.g., E355, 4140, 1020)
• Required Length and Quantity
• Target Application or Special Tolerances / Mechanical Properties
Submit Your RFQ / Send Drawing
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