AN ISO 9001 : 2000
 
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    ALLOY STEELS (EN24 & C45)
 

 
MATERIAL CHEMISTRY APPLICATION HEAT TREATMENT DETAILS
AISI/
ASTM
EN
DIN
JIS
C
Si
Mn
P
S
Cr
W
Mo
Ni
V
 
Annealing
(Slow Cooling)
Quenchent
(Hot Bath)
Quenching
Tempering
(Air Cooling)
Annealed(hb)-max
Quenched & (hrc) Tempered
4340
EN 24
0.40
0.25
0.65
0.04
0.04
.80
0.37
1.5
Used in construction of aircrafts and heavy vehicle
for crankshaft, gearshaft,
camshaft, propellershaft etc
650-700
OIL
830-850
670-530
220
48
1045
EN43B
CK45
0.45
0.25
0.8
0.035
0.035
General engineering, mold base
660-700
OIL/WATER
830-860
670-530
190
38

An alloy is a substance consisiting of 2 or more chemical elements with one of them being a metal thus resulting in desired metallic properties.Steel is an alloy of Iron and carbon. Functions of main Alloying elements

Carbon(C)
Directly influences the hardness and strength of the steel, decreases toughness.
Chromiun(Cr)
Improves Hardenability, high temperature strength, wear resisitance and even corrosion resistance(Cr>14%).
Cobalt(Co)
Improves retention of hardness at high temperatures.
Molybdenum(Mo)
Increases yield point and strength. Improves Hardenability and wear resistance. Manganese Lowers effects of Iron sulphides, increases hardenability, wear resistance.
Nickel(Ni)
Increases toughness at lower temperatures, slows the corrosion process. Improves toughness, grainstructure, high temperature strength, wear resistance, etc.
Vanadium(V)
Increases wear resistance, high temperature strength, retention of hardness etc.
Silicon(Si)
It is a deoxidizing agent. Increases strength and wear resistance. It is of importance that certain elements are as low as possible. Elements like Hydrogen, Oxygen, Nitrogen, Phosphorous, Sulphur create defects inside & also reduce the mechanical properties of steels.
 
 
 
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