1. Commodity: Concrete pump delivery cylinder

2. Steel Grade: CK45,C45E,SAE 1045,S45C,ST52,E355,E410,E470

3. Bore size: 150mm-280mm

4. Thickness of hard chrome plating:0.2mm-0.25mm

5. Hardness of chromed layer: HV850 min

6. Bore roughness: Ra0.25um max

7. ID tolerance: +0.1mm/-0

8. Machining&turning: as per drawing.