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GB/T3094 OMEGA Shaped Steel Tube and Pipe
Material, Specification, Key Features (Detailed Introduction)
The GB/T3094 standard specifies the requirements for omega-shaped steel tubes and pipes, which are widely used in various structural applications. These tubes are characterized by their unique omega shape, providing enhanced strength and stability compared to traditional round or square tubes. The standard outlines the material specifications, dimensions, and mechanical properties required for these products.
Key Features:
Shape: Omega-shaped design for improved structural integrity.
Versatility: Suitable for various applications, including construction and manufacturing.
Strength: Enhanced load-bearing capacity due to the cross-sectional shape.
Corrosion Resistance: Often treated or coated to improve durability.
Chemical Composition
The chemical composition of omega-shaped steel tubes is critical for ensuring their performance and durability. Below is a table presenting the typical chemical composition for the steel grades used in GB/T3094.
| Element | Composition (%) |
| Carbon (C) | 0.12 - 0.20 |
| Manganese (Mn) | 0.30 - 0.60 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.025 |
| Silicon (Si) | 0.15 - 0.40 |
| Chromium (Cr) | ≤ 0.25 |
| Nickel (Ni) | ≤ 0.25 |
Mechanical Properties
The mechanical properties of omega-shaped steel tubes are essential for their application in structural engineering. The following table summarizes the key mechanical properties:
| Property | Value |
| Yield Strength (MPa) | ≥ 235 |
| Tensile Strength (MPa) | ≥ 400 |
| Elongation (%) | ≥ 20 |
| Hardness (HB) | ≤ 180 |
Physical Properties
Understanding the physical properties of omega-shaped steel tubes is crucial for their application in various environments. The following table presents these properties:
| Property | Value |
| Density (g/cm³) | 7.85 |
| Melting Point (°C) | 1425 - 1540 |
| Thermal Conductivity (W/m·K) | 50.2 |
| Electrical Resistivity (μΩ·m) | 0.00001724 |
Process Performance
The process performance of omega-shaped steel tubes is vital for their manufacturability and usability. Below is a table summarizing the process performance characteristics:
| Property | Value |
| Weldability | Good |
| Formability | Excellent |
| Machinability | Moderate |
| Surface Finish | Smooth |
Steel Grade (Detailed Introduction)
The GB/T3094 standard includes several steel grades, each tailored for specific applications and performance requirements. Common grades include:
Q235: A general-purpose structural steel with good weldability and moderate strength.
Q345: A high-strength low-alloy steel, suitable for heavy-duty applications.
S235: A European standard equivalent, known for its good mechanical properties.
These grades are selected based on the specific requirements of the application, including load-bearing capacity, environmental conditions, and fabrication processes.
Application
Omega-shaped steel tubes are utilized in various applications, including:
Construction: Used in building frames, bridges, and other structural components.
Manufacturing: Employed in the production of machinery and equipment.
Automotive: Used in vehicle frames and components for enhanced strength and weight reduction.
Furniture: Applied in the design of modern furniture due to their aesthetic appeal and strength.
Possible Alternative Grades
In addition to the standard grades specified in GB/T3094, several alternative grades may be considered based on specific requirements:
ASTM A500: A standard specification for cold-formed welded and seamless carbon steel structural tubing.
EN 10219: A European standard for cold-formed welded and seamless structural hollow sections of non-alloy and fine-grain steels.
JIS G3466: A Japanese standard for structural steel tubes.
These alternative grades may offer similar mechanical properties and applications, providing flexibility in material selection based on availability and cost.
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