Electric Resistance Welded Carbon Steel Tubes JIS G3472 for Automotive Structural Purposes
Introduction
Electric Resistance Welded (ERW) carbon steel tubes are a critical component in the automotive industry, used extensively for various structural purposes. JIS G3472 is the Japanese Industrial Standard that specifies the requirements for these tubes. In this article, we will explore the material, specification, chemical composition, mechanical properties, steel grade, and applications of JIS G3472 ERW carbon steel tubes.
Material and Specification
JIS G3472 specifies electric resistance welded carbon steel tubes with various characteristics. These tubes are available in different shapes, sizes, and dimensions, catering to the diverse needs of the automotive industry. The standard covers both seamless and welded tubes, but our focus here is on electric resistance welded ones.
Chemical Composition
The chemical composition of JIS G3472 ERW carbon steel tubes is crucial for determining their suitability and performance in automotive structural applications. The following table outlines the typical chemical composition of these tubes:
| Element | Chemical Composition (%) |
| Carbon (C) | 0.20 - 0.35 |
| Silicon (Si) | 0.35 max |
| Manganese (Mn) | 0.30 - 1.00 |
| Phosphorus (P) | 0.040 max |
| Sulfur (S) | 0.040 max |
Mechanical Properties
The mechanical properties of JIS G3472 ERW carbon steel tubes play a vital role in their structural performance and integrity. These properties ensure the tubes can withstand the stresses and strains experienced in automotive applications. The following table showcases the typical mechanical properties of these tubes:
| Property | Mechanical Value |
| Tensile Strength (MPa) | 370 - 510 |
| Yield Strength (MPa) | 215 min |
| Elongation (%) | 30 min |
| Hardness (HRB) | 65 max |
Steel Grade
JIS G3472 ERW carbon steel tubes are classified into different steel grades based on their mechanical properties and applications. The most common steel grade specified in the standard is STAM290GA. The steel grade designation provides essential information about the tubes' composition and performance characteristics.
Application
JIS G3472 ERW carbon steel tubes find widespread application in the automotive industry for various structural purposes. Some of the key applications include:
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Chassis and Frame: These tubes are used in the construction of vehicle chassis and frames, providing the necessary strength and support.
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Axles and Suspension: JIS G3472 tubes are utilized in manufacturing axles and suspension components, ensuring durability and resilience.
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Roll Cages: Automotive roll cages, crucial for occupant ety, are often fabricated using these high-quality carbon steel tubes.
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Exhaust Systems: ERW carbon steel tubes are suitable for forming exhaust systems, offering resistance to high temperatures and corrosion.
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ety Components: They are employed in various ety components like seat frames, reinforcing the vehicle's structure.
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