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Piston rods are classified as solid piston rods and hollow piston rods. Solid piston rods are made from hard chromed plated steel bars with welding and CNC turning, while hollow piston rods are made from seamless pipes/tubes. The most important procedure for piston rods is hard chrome plating, because it is the chromed layer that ensures the property of wear resistance and corrosion resistance. Some rods used in high pressure cylinders are induction hardened or quenched&tempered to improve hardness and strength.
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Typical Steel Grades used as (Hollow) Piston rods | |
ASTM: | 1026, 1045, 1518, 1524, 4130, 4140 |
DIN: | ST52, ST52.3, ST52.4 |
EN: | CK45/C45E, E355, E410, E470, 20MnV6, E355K2, E355J2G3, S355JR, 42CrMo4 |
JIS: | S45C, STC370, STC440, STC510A, STC510B, STC540, STC590A, STC590B |
GB | 45#, 16Mn, 25Mn, 27SiMn, 42CrMo |
Manufacture Process:
01 Round bars or seamless pipe |  | 02 Heat Treatment like Induction hardening or Q+T |  | 03 Peeling or OD machining |  | 04 Grinding |
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06 Surface Polishing |  | 05 Hard Chrome Plating | ||||
Main Specifications:
Chromed bars | Hollow Rods | |
Size Range: | 8mm-350mm | 40mm*20mm-240mm*200mm |
OD Tolerance: | f7/f8 | f7/f8 |
ID Tolerance: | ∕ | +/-0.5mm |
Chromed Layer Thickness: | 0.02mm-0.03mm or as per request | 0.02mm-0.03mm or as per request |
Chromed layer hardness: | HV800 min | HV800 min |
Salt spray time: | 60-120 hours depending on chromed layer thickness | 60-120 hours depending on chromed layer thickness |
Surface roughness: | Ra0.25um or Ra0.35um as per request | Ra0.25um or Ra0.35um as per request |
Chemical Composition: | As per steel grade | As per steel grade |
Mechanical properties: | Based on steel grade and heat treatment | Based on steel grade and heat treatment |
