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Help CenterSteel Pipe & Tube & Precision Steel Tube，10#、20#、45#、16Mn、27SiMn、40Cr、42CrMo、15CrMoG、12Cr1MoVG
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1. Product Overview
Precision seamless tubes are manufactured via cold drawing, cold rolling and precision finishing processes, featuring ultra-precise dimensional tolerance, smooth inner & outer surfaces, uniform wall thickness and excellent mechanical performance.Compared with ordinary hot-rolled seamless tubes, precision tubes have tighter tolerance control, less surface oxide skin and better straightness, widely used in hydraulic systems, machinery equipment, automotive parts, instrument piping and high-precision mechanical structural components requiring high dimensional accuracy.
Main Implementation Standards
Chinese National StandardsGB/T 3639 Cold-drawn or Cold-rolled Seamless Precision Steel TubesGB/T 8162 Structural seamless steel tubesGB/T 8163 Fluid seamless steel tubes
International StandardsEN 10305-1 / EN 10305-4 European precision steel tube standardASTM A519 American precision mechanical tubing
2. Common Materials & Characteristics
2.1 Carbon Steel Precision Tubes
10#, 20#, 45#Performance: Good plasticity, easy machining and welding, low cost; suitable for hydraulic cylinder barrels, common mechanical structures
2.2 Alloy Steel Precision Tubes
40Cr, 42CrMo, 16Mn, 27SiMnPerformance: High tensile strength, good wear resistance and fatigue resistance; for high-load mechanical parts, engineering hydraulic cylinders
2.3 Boiler Alloy Precision Tubes
15CrMoG, 12Cr1MoVGPerformance: High temperature creep resistance, anti-oxidation; used for small-bore high-precision heating surface tubes of boilers
3. Specification Parameters
Outer Diameter Range
Φ4mm ~ Φ160mm
Wall Thickness Range
0.5mm ~ 25mm
Standard Length
6m fixed length; customizable 2–12m random lengths
Dimensional Tolerance (Core Advantage of Precision Tubes)
Outer diameter tolerance: ±0.02mm ~ ±0.05mm
Wall thickness tolerance: ±0.03 ~ ±0.08mm
Straightness: ≤0.5mm/m
Inner surface roughness: Ra ≤ 1.6μm, no oxide scale, scratches or peeling defects
Theoretical Weight Formula
W=0.02466×(OD-WT)×WT (kg/m)OD=Outer Diameter; WT=Wall Thickness
4. Production Process Flow
Raw tube blank pickling & phosphating: Remove surface rust, form lubrication film for cold working
Cold drawing / cold rolling precision forming: Control OD and wall thickness to precision tolerance
Stress relief annealing / full annealing: Eliminate cold work hardening, improve machinability
Straightening: Ensure tube straightness
Inner & outer surface polishing / honing (optional): Ultra-smooth inner wall for hydraulic usage
Cutting to fixed lengths, deburring both ends
100% inspection: Size measurement, surface inspection, flaw detection
Anti-rust treatment, plastic cap sealing, packing
5. Factory Inspection Items
Dimensional inspection: Outer diameter, wall thickness, length, ovality, straightness
Surface inspection: Visual inspection for cracks, scratches, pits, peeling
Mechanical tests: Tensile test, hardness test, flattening test, expanding test
Non-destructive testing: Eddy current testing, ultrasonic testing for internal defects
Hydraulic test (for fluid/hydraulic usage): No leakage under specified test pressure
6. Core Product Advantages
Ultra-high dimensional precision, small tolerance error, minimal machining allowance for customers
Smooth inner and outer surfaces, no heavy oxide skin, saving post-processing polishing cost
Uniform wall thickness, even stress bearing, stable performance under pressure
Good surface finish after cutting, convenient for bending, welding, turning and honing
Stable mechanical property after annealing, low residual stress, not easy to deform during processing
7. Application Fields
Hydraulic & Pneumatic industry: Hydraulic cylinder barrels, precision hydraulic tubing, oil pipeline
Automobile manufacturing: Engine pipeline, shock absorber tubes, axle sleeves
General machinery: Precision machinery shafts, bearing sleeves, linear guide tubes
Power & boiler industry: Small-bore precision high-pressure boiler tubes, instrument sampling tubes
Instrument & aerospace: Clean precision instrument piping, light structural parts
Construction machinery: High-pressure hydraulic tubes for excavators, loaders
8. Delivery, Packing & Lead Time
Delivery state: Annealed cold finished state; bright polished surface or black pickled surface as requested
Surface treatment options: Anti-rust oil coating, plastic film wrapping
Packing: Small tubes bundled with steel strips, both ends covered by plastic protective caps; large tubes packed separately
Lead timeStandard spot specifications: 1–3 days deliveryCustom special size & material precision tubes: 5–7 days production cycle, available for shipment from Tianjin Port
Shipping documents: Material test certificate, dimensional inspection report, NDT report, factory certification
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