MATERIAL

CHEMISTRY

HEAT TREATMENT DETAILS

AISI/
ASTM

EN

DIN

JIS

C

SI

Mn

P

S

Cr

Ni

Mo

V

Anealing
(Slow Cooling)

Quenchent
(Hot Bath)

Quenching

Tempering
(Air Cooling)

Annealed
(HB) - Max

Quenched
(Hrc) Tempered

4340 

EN24 

0.40

0.25 

0.65

0.03 

0.04

1.2 

650-700 

OIL

830-850 

670-530 

220 

48 

1045 

EN43B 

Ck45 

0.45 

0.25

0.8

0.03

0.03

660-700 

OIL/WATER 

670-530

190 

38 

ALLOY STEEL

AISI

DIN

Supply Condition

Rounds

Square

Flat

Application

4340

(En24)

Annealed 

8 - 1000 

100 - 400 

300X50 - 500X300 

Used in construction of aircrafts and heavy vehicles for crankshafts, gearshafts, camshafts and propellor shafts etc. 

1045

Ck45 

Annealed 

25 - 700 

300X20 - 1500X250

General engineering and mould basis.