Chrome cylinder bar is produced by using advanced processing techniques usually on AISI 1045/CK45 or other steel rods, for surface removal, polishing, induction hardening, followed by hard chrome plating to a thickness minimum of 0.0005” or 0.001” per side. The finished product results in a superior impact resistant bar ideal for high quality piston rods capable of handling tough environments.
Industrial hard chrome plating is very different from the decorative chrome you’d find on the Harley tailpipe that wakes up your neighbourhood from time to time. The biggest difference is hardness. For cylinder rods, leading hydraulic seal manufacturer Hallite recommends chrome hardness of at least 900 HV/10). However, there are other factors that go into the hard chrome plating process to ensure it is suitable for the proper operation and performance of your hydraulic cylinder
Heat Treatment of AISI 1045 /CK45 chrome cylinder bar
- AISI1045 (CK45) Annealing
Full annealing of small C1045 forgings is carried out from 1450-1600ºF (790-870ºC)
followed by furnace cooling at 50ºF (28ºC) per hour, to 1200ºF (650ºC) soaking and air cooling.
- AISI 1045 (CK45) Hardening
Hardening of this grade is carried out from an austenitizing temperature of 1475-1550ºF (800-845ºC) and oil or water quenching.
Flame and induction hardening may be carried out by heating quickly to the desired case depth and quenching in water or oil. This should be followed by a tempering treatment at 300-400ºF (150-200ºC) to reduce stresses in the case without affecting its hardness. A surface hardness of Rc 58 may be obtained by this treatment.
- Quenching of AISI 1045 (CK45) material
Quenching temperature / ℃ | salt bath furnace: 870
Quenching temperature / ℃ | controlled atmosphere furnace: 870
The heat preservation time/min: 5 ~ 15
Quenching medium: Water cooling
- Tempering Of AISI1045 (CK45)
Tempering temperature / ℃ : 552
After tempering hardness HRC or higher: 201-269HB .
