SPECIFICATIONS
AECMA :
- Designation: FE-PL1504
- 33CrMoV12
AIR : 32 CDV 13
UNS : K24340
For the vacuum melted and remelted grade:
UNS : K24340
MECHANICAL PROPERTIES
Annealed condition: heat to 850 C followed by slow cooling.
- Brinell hardness: 210
Oil quench from 900/925 C. Temper at 600 C.
- UTS: 1300 N/mm2
- 0.2 % Yield strength: 1100 N/mm2
- Elongation (5d): 15 %
- Impact strength KCU: 70 J/cm2
Oil quench from 900/925 C. Temper at 660 C.
- UTS: 1000 N/mm2
- 0.2 % Yield strength: 850 N/mm2
- Elongation (5d): 20 %
- Impact strength KCU: 170 J/cm2
COMPOSITION
Carbon ..............................................0.30
Chromium..........................................3.00
Molybdenum......................................1.00
Vanadium ..........................................0.20
APPLICATIONS
GKH is used to produce nitrided parts which
need to be extremely stable after hardening
and tempering. It is particularly suitable for
producing parts that undergo special nitriding.
Gears, spindles, machine-tool fittings,
crankshafts, precision parts, aircraft parts.
Thrust rings, bearing races working up
to 400 C.
CHARACTERISTICS
Nitriding steel with an excellent level of harde-
nability and particularly high mechanical
properties, impact strength and fatigue limit
(GKHW and GKHYW grades).
It may be nitrided in the heat treated condition
to obtain a strength from 900 N/mm2
to 1350 N/mm2. The nitrided layer is ductile.
1848f
Steel
GKH33CrMoV12-9
Variants:
GKHW: Consumable electrode remelted grade
GKHYW: Vacuum induction melted and consumable
electrode remelted grade
HEAT TREATMENT
Harden:
- Heat to 900/925 C.
- Oil quench.
Temper:
- Above 525 C
depending on properties required.
Nitriding:
- Surface hardness:
approx. 850 Vickers.
PHYSICAL PROPERTIES
Density: 7.8
Mean coefficient of expansion in m/m.C:
- between 20 C and 100 C:11.8 x 10-6
- between 20 C and 500 C:13.6 x 10-6
Critical points:
- Ac 1: 800 C
- Ac 3: 845 C
TEMPERING CURVE
500 600 700
44
46
42
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
440
460
420
400
380
360
340
320
300
280
260
240
220
200
180
160
140
120
100
80
60
40
20
0
% J/cm2
0
N/mm2UTS - 0.2 % YS
N/mm2
A %: 5d
KCU: J/cm2
UTS
0.2 % YS
A
K
2200
2300
2100
2000
1900
1800
1700
1600
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
GKH1848f
Heated to 900/925 C, oil quenched.
(Heat treatment on rough machined blanks)
1150/1000 C
FORGING
AUBERT & DUVAL
22, rue Henri-Vuillemin 92230 Gennevilliers - France
Tel: 33 (0)1 55 02 58 00 Fax: 33 (0)1 55 03 58 01
Internet: http://www.aubertduval.fr e-mail:
[email protected]
The data provided in this document represent typical or average
values rather than maximum or minimum guaranteed values. The
applications indicated for the grades described are given as
guidance only in order to help the reader in his personal
assessment. Please note that these do not constitute a guarantee
whether implicit or explicit as to whether the grade selected is
suited to
specific requirements. Aubert & Duvals liability shall not
under any circumstances extend to product selection or to the
consequences of that selection.
