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GB/T 3094 Cold Drawn Seamless Special Shaped Steel Tubes
Material
GB/T 3094 specifies the requirements for cold drawn seamless special shaped steel tubes, which are primarily used in various engineering applications. These tubes are characterized by their unique shapes and dimensions, making them suitable for specific structural and mechanical purposes.
Specification
The standard outlines the specifications for the manufacturing process, dimensions, tolerances, and testing methods for these steel tubes. The tubes can be produced in various shapes, including rectangular, oval, and other custom profiles.
Key Features
Seamless Construction: The absence of welds enhances the strength and durability of the tubes.
Cold Drawn Process: This process improves dimensional accuracy and surface finish.
Special Shapes: Custom shapes allow for versatile applications in different industries.
High Strength: The material properties ensure high tensile strength and resistance to deformation.
Chemical Composition
The chemical composition of the steel used in GB/T 3094 tubes is critical for ensuring the desired mechanical properties. Below is a typical composition table:
| Element | Composition (%) |
| Carbon (C) | 0.10 - 0.25 |
| Manganese (Mn) | 0.30 - 0.60 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.025 |
| Silicon (Si) | 0.10 - 0.40 |
| Chromium (Cr) | 0.00 - 0.30 |
| Nickel (Ni) | 0.00 - 0.30 |
Mechanical Properties
The mechanical properties of the cold drawn seamless special shaped steel tubes are essential for their performance in applications. The following table summarizes these properties:
| Property | Value |
|---|---|
| Yield Strength (MPa) | ≥ 250 |
| Tensile Strength (MPa) | ≥ 450 |
| Elongation (%) | ≥ 20 |
| Hardness (HB) | ≤ 200 |
Physical Properties
The physical properties of the steel tubes also play a significant role in their application. The table below presents these properties:
| Property | Value |
| Density (g/cm³) | 7.85 |
| Thermal Conductivity (W/m·K) | 50.2 |
| Electrical Resistivity (Ω·m) | 1.68 × 10^-8 |
Process Performance
The process performance of the steel tubes is crucial for their manufacturability and usability. Below is a table summarizing key performance metrics:
| Performance Metric | Value |
| Cold Drawn Reduction (%) | 10 - 30 |
| Bend Radius (mm) | ≥ 2.5 × tube diameter |
| Surface Roughness (Ra) | ≤ 1.6 |
Steel Grade
The steel grades specified in GB/T 3094 are designed to meet various mechanical and chemical property requirements. Common grades include:
Q195: Low carbon steel with good weldability and formability.
Q235: A general structural steel with moderate strength and good plasticity.
Q345: High strength low alloy steel, suitable for heavy-duty applications.
Application
Cold drawn seamless special shaped steel tubes are widely used in various industries, including:
Construction: Structural components, frames, and supports.
Automotive: Chassis and suspension parts.
Aerospace: Components requiring high strength-to-weight ratios.
Manufacturing: Machinery and equipment parts.
Possible Alternative Grades
In addition to the specified grades, alternative grades may be considered based on specific application requirements:
S235: European standard equivalent for general structural applications.
S355: Higher strength steel for demanding applications.
A500: American standard for structural tubing.
These alternatives can provide similar mechanical properties and may be used depending on availability and specific project needs.
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