China Manufacturer Excavator Parts High Quality Hydraulic Boom Cylinder
China manufacturer excavator parts high quality hydraulic boom cylinder
Material |
45# high grade carbon steel or 40CR |
Tempering hardness |
HB240-260 |
The depth of the high frequency |
2mm-3mm |
High frequency hardness |
HRC55°±2° |
Chrome plating thickness |
0.03mm-0.06mm |
Chromium layer hardness |
HV800-1000vpn |
Straightness |
≤0.08mm/m |
Surface roughness |
Ra0.03um- Ra0.06um |
Outside diameter tolerance |
f7 |
Kind of steel |
45# |
Tensile strength N/mm |
≥647 |
Linearity |
0.3-1/1000 |
Specific elongation |
≥4 |
Precision of size |
HB |
|
207 |
Roughness of inner hole |
0.4-0.8 |
|
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