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Hard Chrome Hydraulic Piston Rod
A hard chrome hydraulic piston rod is a critical and highly engineered component found in virtually every hydraulic cylinder. It serves as the linear motion element, transmitting the force generated by pressurized hydraulic fluid to the machine's moving part. The performance and longevity of the entire hydraulic system heavily depend on the quality and durability of the piston rod.
Description
A hard chrome hydraulic piston rod is a critical and highly engineered component found in virtually every hydraulic cylinder. It serves as the linear motion element, transmitting the force generated by pressurized hydraulic fluid to the machine's moving part. The performance and longevity of the entire hydraulic system heavily depend on the quality and durability of the piston rod.
The core of the rod is typically manufactured from high-strength, low-carbon steel, such as AISI 1045 or 4140, providing the necessary structural integrity to withstand significant tensile, compressive, and buckling forces. However, the defining characteristic of this component is its surface treatment: a hard electroplated chromium layer.
This chrome plating is applied to a precise thickness, usually ranging from 20 to 40 microns (0.0008" to 0.0016"). The process involves electroplating a layer of chromium onto a meticulously prepared and polished steel substrate. The result is an exceptionally hard surface, typically measuring 68-72 on the Rockwell C hardness scale.
The hard chrome plating delivers several indispensable benefits:
Extreme Wear Resistance
It protects the rod from abrasion caused by contaminants, both in the hydraulic fluid and the external environment, significantly extending its service life.
Corrosion Resistance
It provides a robust barrier against rust and corrosion, which is crucial for cylinders operating in harsh, humid, or chemically aggressive conditions.
Low Friction Coefficient
The smooth, hard surface minimizes friction as the rod cycles in and out of the cylinder barrel, enhancing efficiency and reducing heat generation.
Superior Surface Finish
After plating, the rod is precision ground and polished to an ultra-smooth finish (often to Rz 0.2µm - 0.4µm). This mirror-like finish ensures effective sealing by the rod gland, preventing fluid leaks and excluding contaminants.
| Hard Chrome-plated Bars --CK45 | |
| Metric Size | Dia 12mm to 200mm |
| Standard Length | 2m to 8m |
| Delivery lengths | In random 2m-8m Cut length available as per request |
| Surface Hardness | Chrome layer hardness 900-1150HV(66-70HRC) |
| Surface Smoothness | Max.Ra<0.2mu |
| Surface Finish | Surface will be free of dent, pitting or scratches |
| Roundness | Out of Roundness is max 1/3 of diameter tolerance |
| Chrome thickness | Minimum 20micron |
| Tolerances | ISO f7 |
| Circularity | (Triangularity, avality)<1/4 of f7 tolerance, measured in radial deviation |
| Straightness | Max.0.1mm/m |
| Corrosion Resistance | Rating 10 achieved after 72hrs in neutral salt spray |
| Packing | Packed in cardboard tube individually and bundled |
In summary, the hard chrome hydraulic piston rod is a masterpiece of metallurgy and surface engineering. By combining the tensile strength of steel with the hardness and corrosion resistance of chromium, it ensures reliable, efficient, and long-lasting performance in the most demanding industrial applications, from construction machinery and agricultural equipment to manufacturing presses and aerospace systems.
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