What is ck45 round bar hardness hrc

 CK45 round steel bar general purpose medium carbon steel delivered in as hot rolled condition. It can be further heat treated to achieve specific mechanical properties. The 0.45% carbon content is not favorable for welding. However, it can be weld with appropriate pre and post weld heat treatment. Surface hardness of 57~62 HRC can be achieved with cast hardening to a depth of approximately 1mm. Used for most transmission and motor parts of medium strength. Case hardened parts such as camshafts, gears, rocking levers etc. Simple hand tools and various types of fasteners and fixtures, machinery parts and components with medium stress.

INFORMATION OF CK45 CARBON STEEL ROUND BAR

CK45 CARBON STEEL ROUND BAR CHEMICAL COMPOSITION

C
Mn
Si
Cr
Ni
Mo
P
S
0.42-0.50
0.50-0.80
0.40
0.40
0.40
0.10
0.035
0.02-0.04

HOT WORK AND HEAT TREATMENT TEMPERATURES 

Forging
Normalization
Subcritical annealing
Isothermal annealing
Hardening
Tempering
1100~850*
840~880
650~700*
820~860
600x1h*
820~860 water
550~660

To attain the appropriate hardness and mechanical qualities, C45 steel can be toughened by heat treatment procedures such quenching and tempering. Here is a broad description of the C45 steel heat treatment procedure:

Annealing : Annealing is done to get a homogenous microstructure, reduce internal tensions, and improve machinability. The steel is heated in the furnace to a temperature of around 800–850°C (1472–1562°F).

Hardening: The C45 round steel bar is heated to a temperature of roughly 820–860°C (1508–1580°F) and then hardened (quenched) in water or oil. The steel is rapidly cooled during quenching, which results in martensite production and the necessary hardness.

Tempering: Following quenching, the hardened steel must be reheated to a certain temperature below its critical point and held there for a predetermined amount of time. This process is known as tempering. This procedure helps the hardened steel become less brittle and increases its toughness and strength while preserving the proper hardness. Depending on the intended qualities, tempering temperatures and times might vary, but they commonly fall between 400 and 600 °C (752 and 1112 °F).

The exact heat treatment parameters, such as the quenching medium, tempering temperature, and duration, will determine the hardness attained after heat treatment, among other things. After heat treatment, the typical hardness range for C45 round steel bar is in the 55–60 HRC.

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