Product Overview
Carbon steel precision tubes are seamless steel tubes manufactured through controlled cold drawing, heat treatment, and dimensional inspection processes. They are used in hydraulic cylinder manufacturing and industrial fluid power systems where dimensional stability and surface consistency are required.
These tubes are designed for:
•Controlled dimensional accuracy in hydraulic assemblies.
•Stable sealing performance under pressure conditions.
•Fatigue resistance under cyclic mechanical loading.
•Reduced machining requirements in OEM production processes.
Application Scope
Products are used in hydraulic cylinder manufacturing and related industrial systems, including:
Construction machinery hydraulic cylinders.
Agricultural machinery hydraulic systems.
Industrial automation actuation systems.
General hydraulic power transmission systems.
Engineering Performance Logic
Tube performance in hydraulic systems is determined by measurable physical parameters.
Key relationships
• Surface roughness (Ra): Affects sealing interface behavior.
• Inner diameter tolerance: Affects piston motion consistency.
• Straightness: Affects assembly alignment and machining precision.
• Wall thickness consistency: Affects pressure distribution stability.
System-level impact of deviation
• Hydraulic leakage.
• Seal wear acceleration.
• Reduced motion stability.
• Shortened fatigue life under cyclic load.
Technical Specification Range
• Outer Diameter (OD): 6 – 120 mm
• Wall Thickness: 1 – 15 mm
• Length: 3 – 12 meters (custom cutting available)
• Straightness: ≤ 1.0 mm/m
• Surface Roughness: Ra 0.4 – 1.6 μm
Dimensional capability:
• OD tolerance: Up to ±0.03 mm (precision production level).
• Wall thickness tolerance: Controlled within ±5% or tighter upon request.
• ID consistency: Controlled according to hydraulic application requirement.
Material Standards
Materials comply with internationally recognized standards:
• EN 10305: E235 / E355
• DIN: ST37 / ST52
• ASTM: A519 1020 / 1026
• GB: 20# / 45# steel
Material selection is based on:
• Hydraulic pressure conditions
• Load cycle requirements
• System design specifications
Manufacturing Process
Production follows a defined and documented process:
Raw material chemical composition verification.
Tube forming / hot rolling preparation.
Surface treatment (pickling & phosphating)
Multi-stage cold drawing process
Heat treatment (stress relief / annealing)
Straightness correction process
Surface finishing (internal & external)
Non-destructive testing (UT / Eddy Current)
Dimensional inspection (critical parameters)
Export packaging preparation
Quality Control System
Internal inspection:
•Chemical composition verification
•Mechanical property testing (tensile / yield strength)
•Ultrasonic testing (internal defects)
•Eddy current testing (surface condition)
•Dimensional inspection (OD / ID / straightness)
External verification (audit-ready structure):
The following third-party verification can be provided upon request:
•Mill Test Certificate (MTC) per batch
•Third-party inspection (SGS / Bureau Veritas / TÜV or equivalent)
•Customer factory audit support for OEM qualification
•Pre-shipment inspection by independent inspectors
Production Capability
Production is based on continuous cold drawing lines and batch-controlled manufacturing systems.
Capability structure:
Continuous production for standard specifications.
Batch-controlled dimensional consistency system.
OEM order-based production scheduling.
Quality system:
Multi-stage in-process inspection.
Process-controlled quality management system.
Batch traceability for audit review.
Verified Market Application Scope
Products are supplied into hydraulic manufacturing supply chains in:
Europe
South America
Middle East
Southeast Asia
These regions represent established industrial hydraulic equipment manufacturing markets.
Engineering Support
Technical support is available for OEM customers in:
Material selection based on hydraulic working conditions.
Dimensional tolerance optimization for machining compatibility.
Surface finish selection for sealing system performance.
Drawing-based manufacturability evaluation.
Packaging & Export Handling
Standard export protection includes:
Anti-corrosion oil coating.
01
End cap protection.
02
Waterproof wrapping.
03
Wooden or steel frame packaging (optional).
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Designed for international logistics and long-distance transportation.
Supplier Positioning
This product is supplied as a component in hydraulic cylinder manufacturing supply chains.
Supply characteristics include:
Hydraulic application-oriented production focus.
Batch-controlled manufacturing system.
Dimensional consistency control system.
Documented inspection and traceability system.
External inspection compatibility for OEM qualification.
FAQ
Q: What is the function of precision tubes in hydraulic systems?
A: They provide controlled dimensional and surface conditions required for sealing performance and mechanical motion stability.
Q: Can production follow technical drawings?
A: Yes. Production can be adjusted based on customer drawings and specifications.
Q: Are trial orders supported?
A: Yes. Trial production is available before mass production.
Q: Are inspection documents provided?
A: Yes. Mill Test Certificates (MTC) and inspection reports can be provided per batch.
Q: What industries are supported?
A: Hydraulic cylinder manufacturing, construction machinery, agricultural equipment, and industrial fluid power systems.
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