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1. Size range: ø140-ø230
2. Available steel grade:
| DIN: | ST52, ST52.4 |
| EN: | C45E, CK45,E355 |
| ASTM: | AISI 1045 |
3. Manufacture method: Cold drawn, hot rolled+externally machined+deep hole bored
4. Delivery Condition: Stress relieved for cold drawn tubes, quenched+tempered for hot rolled tubes
5. Bore treatment: honing+hard chrome plating+polishing
6. Bore roughness: Ra0.25um max
7. Chemical Composition:
| Element | C | Si | Mn | P | S |
| 1045/CK45/C45E | 0.43-0.50 | 0.15-0.35 | 0.60-0.90 | ≤ 0.025 | ≤ 0.025 |
| ST52/E355 | ≤ 0.22 | ≤ 0.55 | ≤ 1.60 | ≤ 0.025 | ≤ 0.025 |
8. Thickness of hard chrome plating: 0.20mm-0.25mm
9. Hardness of chromed layer: HV850 min
10. Welding,hole drilling, CNC turning as per drawing
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