GB/T8162 Structure Carbon Seamless Steel Pipes
Material
The GB/T8162 standard specifies the material requirements for structure carbon seamless steel pipes. These pipes are primarily made from carbon steel, which provides excellent strength and durability for structural applications. Carbon steel is known for its high tensile strength and good weldability, making it suitable for various structural purposes.
Specification
The specification of GB/T8162 structure carbon seamless steel pipes includes the following key parameters:
| Parameter | Value |
| Outer Diameter | 6mm - 720mm |
| Wall Thickness | 1mm - 120mm |
| Length | 5m - 12m |
These specifications allow for a wide range of sizes and dimensions, providing flexibility in design and application.
Chemical Composition
The chemical composition of GB/T8162 structure carbon seamless steel pipes must conform to the following requirements:
| Element | Composition Range |
| Carbon (C) | 0.22% - 0.30% |
| Silicon (Si) | 0.15% - 0.35% |
| Manganese (Mn) | 0.30% - 0.60% |
| Phosphorus (P) | ≤ 0.040% |
| Sulfur (S) | ≤ 0.040% |
These chemical elements contribute to the overall strength, weldability, and corrosion resistance of the carbon seamless steel pipes.
Mechanical Properties
The mechanical properties of GB/T8162 structure carbon seamless steel pipes are crucial for determining their performance and suitability for various applications. The following table presents the typical mechanical properties:
| Property | Value Range |
| Tensile Strength | 410MPa - 550MPa |
| Yield Strength | ≥ 245MPa |
| Elongation | ≥ 25% |
| Hardness (HB) | ≤ 187 (for cold drawn pipes) |
These properties ensure that the pipes can withstand high structural loads, exhibit good ductility, and maintain their integrity under various operating conditions.
Steel Grade
The GB/T8162 standard defines several steel grades for structure carbon seamless steel pipes. These grades are designated as "Q," followed by a numerical value. The most commonly used steel grades include Q345B, Q345C, Q345D, Q345E, Q390B, Q390C, Q390D, Q390E, Q420B, Q420C, Q420D, Q420E.
Each steel grade has specific chemical composition and mechanical properties, providing engineers and designers with options to match the requirements of their structural projects.
Application
GB/T8162 structure carbon seamless steel pipes find wide application in various industries, including:
- Construction and infrastructure: Used in the construction of buildings, bridges, and other structures, providing strength and stability.
- Machinery and equipment: Employed in the manufacturing of heavy machinery, equipment components, and mechanical parts.
- Oil and gas industry: Utilized for pipelines, well casings, and other oil and gas transmission systems.
- Automotive sector: Applied in the production of automobile frames, chassis, and other structural components.
The versatility, reliability, and cost-effectiveness of these carbon seamless steel pipes make them a preferred choice for numerous applications across different sectors.
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