DIN 2391 St52 Honed Tube
DIN 2391 ST52 Honed Tube
DIN 2391 ST52 Honed Tube is a precision seamless steel tube that is cold-drawn and honed to achieve high dimensional accuracy and excellent surface finish. The “ST52” refers to the steel grade, which is a high-strength, low-alloy steel. The honing process involves finishing the inner surface of the tube to a high degree of smoothness, making it suitable for applications requiring precise tolerances and smooth surfaces.
DIN 2391 ST52 Honed Tube is a high-quality precision tube used in various industries due to its excellent mechanical properties, high precision, and smooth surface finish. Its chemical composition and mechanical properties make it suitable for demanding applications, particularly in hydraulic and pneumatic systems. The tube’s seamless construction and honed interior ensure reliability and performance in high-pressure environments.
Advantages
1. High Precision: The honing process ensures tight dimensional tolerances and a smooth surface finish.
2. Excellent Surface Finish: The inner surface of DIN 2391 ST52 Honed Tube is honed to reduce friction and wear, making it ideal for hydraulic and pneumatic systems.
3. High Strength: ST52 steel offers good mechanical properties, including high tensile strength and toughness.
4. Corrosion Resistance: The steel composition provides moderate resistance to corrosion, especially when properly maintained.
5. Seamless Construction: The seamless nature of the DIN 2391 ST52 honed tube ensures uniformity and reliability in high-pressure applications.
6. Versatility: Suitable for a wide range of applications, including hydraulic cylinders, pneumatic cylinders, and precision engineering components.
Material Composition
| Element | Composition |
|---|---|
| Carbon (C) | ≤ 0.22% |
| Silicon (Si) | ≤ 0.55% |
| Manganese (Mn) | 1.00 – 1.60% |
| Phosphorus (P) | ≤ 0.025% |
| Sulfur (S) | ≤ 0.025% |
| Iron (Fe) | Balance |
Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength | ≥ 355 MPa |
| Tensile Strength | 490-630 MPa |
| Elongation | ≥ 22% |
Delivery Conditions
| Designation | Symbol | Description |
| Cold finished (hard) | BK | Tubes do not undergo heat treatment following the final cold forming and thus have a rather high resistance to deformation. |
| Cold finished (soft) | BKW | The final heat treatment is followed by cold drawing involving limited deformation.Appropriate further processing allows a certain degree of cold forming(e.g.bending,expanding). |
| Cold finished and stress-relieved | BKS | Heat treatment is applied following the last cold forming process.Subject to appropriate processing conditionsthe increase in the residual stresses involved enables both forming and machining to a certain degree. |
| Annealed | GBK | The last cold forming process is followed by annealing in a controlled atmosphere |
| Normalized | NBK | The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere. |
Delivery Condition: SR,BK, BK+S, GBK, NBK
ID Size : 20mm – 1500mm
Length: max 16m
Type: Seamless, Hot Rolled, Cold Rolled, Cold Drawn
Straightness: ≤ 0.5/1000
Roughness: 0.2-0.4 u
Tolerance EXT: DIN2391, EN10305, GB/T 1619,GOST 8731,GOST 1050,GOST4543
Tolerance INT: H7,H8,H9
Protection: Anti-rust oil on inside and outside surface, plastic caps in both ends.
Packing: Bundle with steel strip and PE sheet or Plywood case
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