Engineered for critical fluid delivery and structural applications requiring tight dimensional control. Our small-diameter precision steel tubes feature controlled outer diameters, uniform wall thickness, and clean inner surfaces. Produced via cold drawing or cold rolling, these tubes support high-pressure environments, laser cutting, and complex bending operations without micro-cracking.
Specifications
|
Parameter |
Standard Range / Specification |
|
Outer Diameter (OD) |
3.0 mm – 38.0 mm |
|
Wall Thickness (WT) |
0.5 mm – 4.0 mm |
|
Length |
Fixed length (1,000mm – 6,000mm) or random length |
|
Dimensional Tolerance |
OD/ID: ± 0.05 mm (Higher precision available upon request) |
|
Surface Finish |
Bright annealed, black, oiled, or phosphated |
|
Delivery Condition |
Cold drawn/hard (+C), cold drawn/soft (+LC), stress relieved (+SR), annealed (+A), normalized (+N) |
Material & Manufacturing
Common Steel Grades
• Carbon & Alloy Steel: AISI 1010, 1020, 1035, 1045, E235, E355, 20Mn2
• Stainless Steel: 304/304L, 316/316L, 321
Manufacturing Route & Equipment
• Raw Material Inspection: Eddy current testing on incoming hot-rolled mother tubes for surface defects.
• Cold Drawing / Rolling: Multi-pass cold reduction benches ensure strict wall thickness uniformity and surface smoothness.
• Controlled Atmosphere Annealing: Continuous bright annealing furnaces eliminate internal residual stress and achieve specified mechanical properties (R_m, R_e, A).
• Straightening & Cutting: Roller straightening machines control straightness within 0.5 mm/m, followed by deburred precision cutting.
Quality Inspection
We verify every production batch against international standards (ASTM, EN, DIN, JIS) using traceable testing protocols:
Dimensional Verification: Laser micrometer online measuring and manual micrometer checks for OD, ID, and wall thickness.
Mechanical Testing: Tensile strength, yield strength, and elongation tests executed per batch.
Non-Destructive Testing (NDT): 100% eddy current test for longitudinal defects; hydrostatic or pneumatic pressure tests applied for hydraulic-grade tubes.
Metallographic Analysis: Grain size and decarburization layer inspection.
Applications
Automotive: Fuel injection lines, steering columns, shock absorber cylinders, and exhaust sensors.
Fluid Power: Hydraulic and pneumatic actuator lines requiring burst pressure resistance.
Industrial Machinery: Precision guide rails, roller bearings, and pneumatic cylinders.
Instrumentation: Thermocouple protection tubes and analytical equipment housing.
Customization & Supply
Custom Dimensions:
Non-standard outer diameters and wall thicknesses processed via custom tooling.
Value-Added Processing:
Laser cutting to specific lengths, chamfering, bending, and end-forming (flaring, swaging).
Packaging:
Anti-rust oil coating, bundled with plastic caps, woven bags, or packed in rigid wooden crates to prevent transit damage.
Minimum Order Quantity (MOQ):
Flexible batch sizes for prototyping and full-scale production runs.
FAQ
Q: What is the standard straightness tolerance for your precision steel tubes?
A: Standard straightness is maintained within 0.5 mm per meter. Tighter tolerances (e.g., ≤ 0.25 mm/m) can be achieved for high-speed rotating shaft applications upon request.
Q: Can you supply tubes with clean, burr-free inner surfaces for hydraulic systems?
A: Yes. Tubes destined for hydraulic applications undergo ultrasonic cleaning and protective oil coating to eliminate inner-surface particulate residue.
Q: What delivery conditions do you offer for carbon steel tubes?
A: We supply tubes in +C (hard), +LC (soft), +SR (stress relieved), +A (annealed), and +N (normalized) conditions depending on your downstream bending or machining requirements.
Q: Do you provide Material Test Certificates (MTC)?
A: Yes. Every shipment includes an EN 10204 3.1 MTC detailing chemical composition, mechanical test results, and dimensional inspection records.
Q: What is the typical lead time for custom tube sizes?
A: Standard catalog sizes ship within 2 to 3 weeks. Custom drawing specifications or non-standard heat treatments typically require 4 to 6 weeks.
Q: How are the tubes protected against corrosion during ocean freight?
A: Tubes are coated with a neutral anti-rust oil, capped at both ends, wrapped in moisture-resistant film, and secured in steel-strapped wooden bundles or crates.
Request a Quote
To receive an accurate quotation within 24 hours, please provide the following details in your inquiry:
• Steel Grade & Standard (e.g., E355, AISI 1020, EN 10305-1)
• Dimensions (Outer Diameter × Wall Thickness × Length)
• Delivery Condition / Heat Treatment (e.g., +N, +SR)
• Required Quantity (meters or pieces per order/year)
• Special Requirements (e.g., deburring, specific surface roughness Ra, third-party inspection)
[ Submit Your RFQ / Send Drawing ]
Hot Tags: small-diameter precision steel tubes, China small-diameter precision steel tubes suppliers, factory
