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Help CenterSteel Pipe & Tube & Precision Steel Tube，20#、45#、Q345B、16Mn、40Cr、42CrMo、20CrMo
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Steel Sheet & Plate & Pressure Vessel Plate，Q245R、Q345R、Q370R、Q420R、Q460R、16MnDR（-40℃）、09MnNiDR（-70℃）、15CrMoR、14Cr1MoR、12Cr1MoVRNegotiableMOQ: 5 Metric Tons
1. Product Overview
Precision steel tubes, also known as precision bright tubes, are high-precision seamless steel pipes manufactured by cold rolling, cold drawing and bright annealing processes. Made of high-quality carbon steel and alloy steel, they feature ultra-high dimensional accuracy, oxide-free inner and outer walls, high smoothness, zero leakage under high pressure, no deformation during cold bending, and no cracks after flaring or flattening. They are high-end precision pipes specially used for hydraulic systems, pneumatic components, automotive parts and mechanical precision assembly.
2. Executive Standards
GB/T 3639DIN 2391EN 10305-1 / EN 10305-4
3. Main Materials
20#, 45#, Q345B, 16Mn, 40Cr, 42CrMo, 20CrMo
4. Precision Tolerance
Outer diameter tolerance: ±0.005mm～±0.05mmWall thickness tolerance: ≤±0.05mmStraightness: ≤0.2mm/mHigh roundness and concentricity, no secondary turning required.
5. Product Advantages
Bright & smooth inner/outer surface without oxide scale
Excellent high-pressure tightness, no leakage for hydraulic systems
Superior plasticity: no crack or deformation during bending, flaring and flattening
Ultra-precise dimension reduces machining allowance and production cost
Uniform metallographic structure, high toughness and fatigue resistance
Suitable for electroplating, painting and further heat treatment
6. Production Process
Raw material inspection → Pickling & phosphating → Cold drawing / cold rolling → Bright annealing → Straightening → Precision sizing → NDT inspection → Hydrostatic test → Precision cutting → Anti-rust packaging
7. Delivery Condition
Bright annealed, cold finished, quenched & temperedSurface: mirror bright, clean, oxide-free
8. Applications
Hydraulic cylinders, pneumatic tubes, automobile components, engineering machinery, automated equipment, mold oil pipelines, medical equipment, aerospace precision structural parts and instruments.
9. Quality Inspection
Full dimensional inspection, surface inspection, hydrostatic test, flattening & flaring test, hardness test, metallographic test and ultrasonic testing.
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