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Product Introduction
Cold drawn steel pipe is a kind of high-precision seamless pipe produced by cold drawing process. Processed at normal temperature without high temperature heating, it features tight dimensional tolerance, smooth surface, uniform wall thickness and good straightness. Main materials include 20#, 45#, Q345B and 16Mn. Widely used in precision machinery, hydraulic cylinders, auto parts, instruments and hardware processing fields.
Core Parameters
|
Item |
Specifications |
|
Material |
20#, 45#, Q345B, 16Mn |
|
Type |
Cold drawn seamless pipe, precision cold rolled tube |
|
Outer Diameter |
6mm - 325mm |
|
Wall Thickness |
1mm - 40mm (Thin wall pipe available) |
|
Dimensional Tolerance |
±0.05mm ~ ±0.1mm |
|
Surface |
Bright finish, no oxide scale |
|
Length |
6m fixed length / Custom cutting |
|
Standard |
GB/T 8163, GB/T 3639 |
Technical Principle
Cold drawing process extrudes raw pipes through high-precision moulds at room temperature. The steel grains are refined to make the structure denser. This technology improves hardness and structural stability, and avoids oxide scale caused by high temperature. So the pipes own ultra-high precision, smooth surface and excellent straightness.
Core Advantages
High precision: Tolerance up to ±0.05mm, reduce secondary machining cost.
Smooth surface: No oxide scale, pits or peeling on inner and outer walls.
Stable performance: Higher hardness and torsion resistance than hot rolled pipes.
Uniform wall & good straightness: High concentricity for precise assembly.
Less machining allowance: Save turning and polishing procedures.
Rich specifications: Custom thin wall and non-standard sizes are available.
Application Scenarios
Hydraulic Cylinder: Used for cylinder barrel and sleeve, solving oil leakage caused by rough inner wall.
Auto Parts: Applied to shock absorber sleeves and structural pipes, meeting high-precision assembly demands.
Precision Machinery: Used for equipment frames and shaft sleeves to ensure stable operation.
Hardware & Mould: Used for connectors with high fitting accuracy.
Instruments: Applied to small pipelines and sensor sleeves for stable precision.
Project Cases
Hydraulic Cylinder Project: 45# high precision cold drawn pipes were used directly without polishing, and oil leakage failure rate decreased by 90%.
Auto Fittings Project: Custom thin-wall cold drawn pipes with stable tolerance reached 100% assembly pass rate.
Automation Equipment Project: Q345B cold drawn pipes improved overall structural accuracy and equipment stability.
Optional Configurations
Material selection: 20#, 45#, Q345B for different usage.
Precision customization: Standard / high precision / ultra-high precision tolerance.
Processing service: Cutting, deburring, chamfering, polishing and straightening.
Surface treatment: Anti-rust oil, blackening, painting and galvanizing.
Size customization: Thin wall, thick wall and arbitrary length.
Package: Anti-rust waterproof package and wooden case for export.
FAQ
Q: What is the difference between cold drawn pipe and hot rolled pipe?
A: Hot rolled pipe is formed under high temperature with rough surface, large tolerance and oxide scale. Cold drawn pipe is processed by cold drawing, featuring high precision, bright surface and tight tolerance for precision machining.
Q: What is the tolerance of cold drawn pipe?
A: Normal tolerance is ±0.1mm, and ultra-high precision can reach ±0.05mm.
Q: Is secondary processing necessary?
A: High precision cold drawn pipes can be used directly for most hydraulic and auto parts without re-polishing.
Q: Is cold drawn pipe hard?
A: Cold drawing refines steel grains, so it has higher hardness and tensile strength than ordinary hot rolled pipe.
Q: Can you make non-standard sizes?
A: Yes, we can produce customized pipes according to your drawings and requirements.
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