Products Description
DIN2391 ST37.4 ST35 Seamless Precision Steel Tube
What are the advantages of DIN2391 seamless precision steel tubes?
1. The inner wall roughness of DIN2391 ST37.4 ST35 seamless precision steel tubes is Ra≤0.4μm, and can achieve a mirror effect after honing. This feature can reduce the wear of piston seals and reduce the pressure loss of the hydraulic system by 15%-20%.
2. Steering shaft tubes and brake lines are key parts of automobiles, and they require extremely high dimensional precision. DIN2391 seamless precision steel tubes have precise tolerance control, and the outer diameter tolerance is only ±0.08mm, which can eliminate secondary processing.
3. Since the chassis of automobiles often comes into contact with sewage, grease, and other substances, it is important to prevent the chassis from corrosion. The steel tubes of DIN2391 standard are treated with oiling, phosphating, or galvanizing to enhance their anti-corrosion performance and extend the service life of the chassis.
Applications of DIN2391 Seamless Precision Steel Tube
DIN2391 ST37.4 and ST35 seamless precision steel tubes find widespread applications in various industries due to their excellent mechanical properties and high-precision characteristics. Some common applications include:
Hydraulic systems
Automotive industry
Machinery and equipment
Precision mechanical engineering
General engineering purposes
These precision tubes are especially suitable for applications where dimensional accuracy, smooth surface finish, and high strength are essential.
Chemical Composition
The chemical composition of the DIN2391 ST37.4 and ST35 seamless precision steel tubes is crucial to ensure their mechanical properties and overall performance. The following table provides an overview of the typical chemical composition:
| Element | Carbon (C) | Silicon (Si) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) |
| DIN2391 ST37.4 (%) | 0.17 max | 0.35 max | 0.35 max | 0.035 max | 0.035 max |
| DIN2391 ST35 (%) | 0.17 max | 0.35 max | 0.40 max | 0.025 max | 0.025 max |
Mechanical Properties
The mechanical properties of DIN2391 ST37.4 and ST35 seamless precision steel tubes are essential for understanding their strength, durability, and suitability for various applications. The following table outlines the typical mechanical properties:
| Property | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) |
| DIN2391 ST37.4 | 480 min | 235 min | 25 min | 143 max |
| DIN2391 ST35 | 420 min | 315 min | 35 min | 119 max |
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Packaging
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Once the pipes have passed all inspections and tests, they are ready for packaging. They are usually packaged in bales wrapped in plastic. The pipes can be bundled and ready for delivery according to customer requirements, ensuring that the pipes are protected during transportation and prevent surface damage.
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