CK45 Structural Steel Bar

 

CK45 steel is a medium carbon steel. It also is a general engineering structural steel. It have good machinability  and high tensile properties. CK45 steel normal supply steel Plate, Round bar, Flat bar, Square bar, Hexagonal bar, Pipe. Normal provide the hot rolled black surface, cold drawn birght surface, large size forging is better. Delivery harndess 18-25HRc. CK45 steel is suitable for manufacturing various strong cutting tools with wear-resistant, resistant to impact. Advanced punching die, screw die, the toughness and complicated shape of the punch, etc. Roll cutting tool industry: scraper, serrated knife, iron knives, drill bits, etc.

 

Chemical composition：

 

CMnSiCrNiMoPS
0.42-0.50
0.50-0.80
0.40
0.40
0.40
0.10
0.035
0.02-0.04
 

 

Mechanical Propoerties:

 

Yield Strength
Rp0.2(MPa)		Tensile Strength
Rm(MPa)		Elongation δ5 (%): Reduction
of area ψ (%):		Impact energy
Akv (J):		Modilus of
Elasticity: 		 Hardness
≥ 450 ≥ 585 ≥ 14.5≥ 45≥ 41200 GPa≥ 201 HB

 

Hardness:

Hardness, Rockwell C (Water quenched on 820-870°C, 5 minutes): 201~269HB


Heat treatment:

Heat Treatment of AISI 1045 (CK45) followed by furnace cooling at 50ºF (28ºC) per hour, to 1200ºF (650ºC) soaking and air cooling. Hardening of this grade is carried out from an austenitizing temperature of 1475-1550ºF (800-845ºC) and oil or water quenching.


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.


Tempering:

Tempering temperature / ℃ : 552

After tempering hardness HRC or higher: 201-269HB.


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