DIN 2393-2 E235 ST37.2, ST52.3, STKM11, STKM12 Cold Drawn Welded Tube ERW Carbon Steel Precision Steel Tube for Automobile
Material
DIN 2393-2 specifies the technical delivery conditions for welded precision steel tubes made from carbon steel. These tubes are primarily used in the automotive industry due to their excellent mechanical properties and precision. The materials covered under this standard include E235, ST37.2, ST52.3, STKM11, and STKM12, which are known for their strength, ductility, and weldability.
Specification
The cold drawn welded tubes are manufactured using Electric Resistance Welding (ERW) and are further processed to achieve precision dimensions and enhanced mechanical properties. These tubes are available in various dimensions and can be customized according to specific requirements.
Key Features
- High Precision: Achieved through cold drawing and welding processes.
- Excellent Surface Finish: Suitable for applications requiring a smooth surface.
- Good Mechanical Properties: Offers high strength and ductility.
- Weldability: Easily weldable, making it ideal for automotive applications.
- Versatility: Available in various grades to suit different applications.
Chemical Composition
The chemical composition of these steel grades is crucial for their performance. Below is a table presenting the typical chemical composition:
| Element |
E235 (%) |
ST37.2 (%) |
ST52.3 (%) |
STKM11 (%) |
STKM12 (%) |
| C |
≤ 0.17 |
≤ 0.17 |
≤ 0.22 |
≤ 0.12 |
≤ 0.20 |
| Si |
≤ 0.35 |
≤ 0.35 |
≤ 0.55 |
≤ 0.35 |
≤ 0.35 |
| Mn |
≤ 1.20 |
≤ 1.20 |
≤ 1.60 |
≤ 0.60 |
≤ 0.60 |
| P |
≤ 0.025 |
≤ 0.025 |
≤ 0.025 |
≤ 0.030 |
≤ 0.030 |
| S |
≤ 0.025 |
≤ 0.025 |
≤ 0.025 |
≤ 0.030 |
≤ 0.030 |
Mechanical Properties
The mechanical properties of these tubes determine their suitability for various applications. The table below outlines the typical mechanical properties:
| Property |
E235 |
ST37.2 |
ST52.3 |
STKM11 |
STKM12 |
| Yield Strength (MPa) |
≥ 235 |
≥ 235 |
≥ 355 |
≥ 245 |
≥ 275 |
| Tensile Strength (MPa) |
340-480 |
340-480 |
490-630 |
370-510 |
410-550 |
| Elongation (%) |
≥ 25 |
≥ 25 |
≥ 22 |
≥ 30 |
≥ 25 |
Steel Grade
The steel grades covered under DIN 2393-2 include:
- E235: Known for its good weldability and machinability.
- ST37.2: Offers excellent ductility and toughness.
- ST52.3: Provides high strength and is suitable for heavy-duty applications.
- STKM11: Ideal for applications requiring high precision and surface finish.
- STKM12: Offers a balance of strength and ductility.
Application
These precision steel tubes are widely used in the automotive industry for:
- Chassis Components: Due to their strength and precision.
- Hydraulic Systems: For their excellent surface finish and dimensional accuracy.
- Structural Parts: Where high strength and weldability are required.
Possible Alternative Grades
Depending on specific requirements, alternative grades may be considered:
- EN 10305-2: Similar precision tubes with slightly different specifications.
- ASTM A513: Covers electric-resistance-welded carbon and alloy steel mechanical tubing.
- JIS G3445: Japanese standard for carbon steel tubes for machine structural purposes.
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Over the past 30 years, the company has been gradually developing new technologies and materials to meet
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