AUSTENITIC IRON-NICKEL-CHROMIUM-COPPER ALLOY
The invention relates to an austenitic iron-nickel-chromium-copper alloy, the composition of which comprises in % by weight: 24%≦Ni≦36% Cr≧0.02% Cu≧0.1% Cu+Co≦15% 0.01≦Mn≦6% 0.02≦Si≦2% 0≦Al+Ti≦3% 0≦C≦2% 0≦V+W≦6% 0≦Nb+Zr≦0.5% 0≦Mo≦8 Sn≦1 0≦B≦0.006% 0≦S+Se+Sb≦0.008% 0≦Ca+Mg≦0.020% the balance being iron and impurities resulting from the smelting, the percentage nickel, chromium, copper and cobalt contents being such that the alloy furthermore satisfies the following conditions: Co<Cu Co<4% if Cr>7.5% Eq1>28% with Eq1=Ni+1.2Cr+(Cu/5) Cr<7.5% if Ni>32.5%, and the manganese content furthermore meeting the following conditions: if Eq 3 ≥ 205 , Mn ≤ Ni - 27.5 + Cu - Cr if 180.5 ≤ Eq 3 ≤ 205 , Mn ≤ 4 % if Eq 3 ≤ 180.5 , Mn ≤ 2 % with Eq 3 = 6 Ni - 2.5 X + 4 ( Cu + Co ) and X = Cr + Mo + V + W + Si + Al .
1 . Austenitic iron-nickel-chromium-copper alloy, the composition of which comprises in % by weight:
24%≦Ni≦36%
Cr≧0.02%
Cu≧0.1%
Cu+Co≦15%
0.01≦Mn≦6%
0.02≦Si≦2%
0≦Al+Ti≦3%
0≦C≦2%
0≦V+W≦6%
0≦Nb+Zr≦0.5%
0≦Mo≦8
Sn≦1
0≦B≦0.006%
0≦S+Se+Sb≦0.008%
0≦Ca+Mg≦0.020%
the balance being iron and impurities resulting from the smelting, the percentage nickel, chromium, copper and cobalt contents being such that the alloy furthermore satisfies the following conditions:
Co<Cu
Co<4% if Cr>7.5%
Eq1>28% with Eq1=Ni+1.2Cr+(Cu/5)
Cr<7.5% if Ni>32.5%,
and the manganese content furthermore meeting the following conditions:
if
Eq
3
≥
205
,
Mn
≤
Ni
-
27.5
+
Cu
-
Cr
if
180.5
≤
Eq
3
≤
205
,
Mn
≤
4
%
if
Eq
3
≤
180.5
,
Mn
≤
2
%
with
Eq
3
=
6
Ni
-
2.5
X
+
4
(
Cu
+
Co
)
and
X
=
Cr
+
Mo
+
V
+
W
+
Si
+
Al
.
2 . Alloy according to claim 1 , characterized in that the percentage nickel, chromium, copper, cobalt, molybdenum, manganese, vanadium, tungsten, silicon and aluminium contents are such that the alloy furthermore satisfies the following conditions:
0.02
≤
Mn
Eq
2
≥
0.95
with
Eq
2
=
(
Ni
-
24
)
[
0.18
+
0.08
(
Cu
+
Co
)
]
Eq
3
≥
161
Eq
4
≤
10
with
Eq
4
=
Cr
-
1.125
(
Cu
+
Co
)
Eq
5
≤
13.6
with
Eq
5
=
Cr
-
0.227
(
Cu
+
Co
)
Eq
6
≥
150
with
Eq
6
=
6
Ni
-
2.5
X
+
1.3
(
Co
+
Cu
)
Eq
7
≥
160
with
Eq
7
=
6
Ni
-
5
Cr
+
4
Cu
.
3 . Use of an alloy according to claim 2 for the manufacture of electromagnetic devices with temperature self-regulation.
4 . Electromagnetic device with temperature self-regulation comprising an alloy according to claim 2 .
5 . Alloy according to claim 1 , further characterized in that:
Ni
≤
29
%
Co
≤
2
%
0.02
≤
Mn
≤
2
%
Eq
2
≥
0.95
with
Eq
2
=
(
Ni
-
24
)
[
0.18
+
0.08
(
Cu
+
Co
)
]
Eq
3
≥
161
Eq
4
≤
10
with
Eq
4
=
Cr
-
1.125
(
Cu
+
Co
)
Eq
5
≤
13.6
with
Eq
5
=
Cr
-
0.227
(
Cu
+
Co
)
Eq
6
≥
150
with
Eq
6
=
6
Ni
-
2.5
X
+
1.3
(
Co
+
Cu
)
Eq
7
≥
160
with
Eq
7
=
6
Ni
-
5
Cr
+
4
Cu
.
6 . Use of an alloy according to claim 5 for the manufacture of devices with magnetic flux self-regulation.
7 . Device with magnetic flux self-regulation comprising an alloy according to claim 5 .
8 . Alloy according to claim 2 , further characterized in that:
Ni≦35%
C≦0.5%
Eq2≧1
Eq3≧170
Eq6≧159
Eq7≧160.
9 . Use of an alloy according to claim 8 for the manufacture of controlled-expansion devices.
10 . Controlled-expansion device comprising an alloy according to claim 8 .
11 . Alloy according to claim 2 , further characterized in that:
Cu≦10%
C≦0.1
Eq2≧1
Eq3≧170
Eq6≧159
Eq7≧160.
12 . Use of an alloy according to claim 11 for the manufacture of current sensors, measurement transformers or magneto-harmonic sensors.
13 . Current sensor, measurement transformer or magneto-harmonic sensor comprising an alloy according to claim 11 .
14 . Alloy according to claim 2 , further characterized in that:
0.05%≦Mn≦2%
C≦0.1
Eq2≧1.5
Eq3≧175
Eq4≦7 if Ni≦32.5
Eq5≦10.6 if Ni≦32.5
Eq6≧164
Eq7≧160
15 . Use of an alloy according to claim 14 for the manufacture of motors and electromagnetic actuators.
16 . Electromagnet actuator and motor comprising an alloy according to claim 14 .
17 . Alloy according to claim 14 , furthermore characterized in that:
Co≦1.8%
O+N≦0.01%
the alloy furthermore satisfying at least one of the following relationships:
0.0002≦B≦0.002%
0.0008≦S+Se+Sb≦0.004%
0.001≦Ca+Mg≦0.015%.
18 . Use of an alloy according to claim 17 for the manufacture of stators for clock or watch motors.
19 . Stator for a clock or watch motor comprising an alloy according to claim 17 .
20 . Alloy according to claim 11 , further characterized in that:
Eq2≧1.5%
Eq3≧189
Eq4≦4 if Ni≦32.5, or Eq4≦7 if Ni>32.5
Eq5≦4 if Ni≦32.5, or Eq5≦7 if Ni>32.5
Eq6≧173
Eq7≧185.
21 . Use of an alloy according to claim 20 for the manufacture of inductors and transformers for power electronics.
22 . Inductor or transformer for power electronics, comprising an alloy according to claim 20 .
23 . Alloy according to claim 2 , further characterized in that:
Ni≧30%
C≦1%
Eq2≧1.5
Eq3≧189
Eq4≦4 if Ni≦32.5, or Eq4≦7 if Ni>32.5
Eq5≦4 if Ni≦32.5, or Eq5≦7 if Ni>32.5
Eq6≧173
Eq7≧185
Eq8≧33 with Eq8=Ni+Cu−1.5Cr.
24 . Use of an alloy according to claim 23 for the manufacture of bimetallic strips.
25 . Bimetallic strip comprising an alloy according to claim 23 .
26 . Alloy according to claim 14 , further characterized in that:
Eq2≧2
Eq3≧195
Eq4≦2 if Ni≦32.5, or Eq4≦6 if Ni>32.5
Eq5≦2 if Ni≦32.5, or Eq5≦6 if Ni>32.5
Eq6≧180
Eq7≧190.
27 . Alloy according to claim 26 , further characterized in that:
Eq9≧13000 with Eq9=1100(Ni+Co/3+Cu/3)−1200Cr−26000
28 . Use of an alloy according to either of claim 26 or 27 for the manufacture of the cores of clock or watch motor coils and electromagnetic relays of high sensitivity.
29 . Core of a clock or watch motor coil or electromagnetic relay of high sensitivity comprising an alloy according to either of claim 26 or 27 .
30 . Alloy according to claim 1 , further characterized in that:
Cu
≤
10
%
0.02
≤
Mn
C
≤
1
%
Eq
2
≥
0.4
with
Eq
2
=
(
Ni
-
24
)
[
0.18
+
0.08
(
Cu
+
Co
)
]
Eq
3
≥
140
Eq
4
≤
10
with
Eq
4
=
Cr
-
1.125
(
Cu
+
Co
)
Eq
5
≤
13.6
with
Eq
5
=
Cr
-
0.227
(
Cu
+
Co
)
Eq
6
≥
140
with
Eq
6
=
6
Ni
-
2.5
X
+
1.3
(
Co
+
Cu
)
Eq
7
≥
125
with
Eq
7
=
6
Ni
-
5
Cr
+
4
Cu
.
31 . Use of an alloy according to claim 30 for the manufacture of devices for contactless temperature measurement or temperature violation indication.
32 . Contactless temperature measurement or temperature violation indication device comprising an alloy according to claim 30 .
33 . Alloy according to claim 1 , further characterized in that:
Mn≦2%
Si≦1%
Cu≦10%
Cr+Mo≦18%
C≦0.1
Ti+Al≦0.5%,
the alloy furthermore satisfying at least one of the following relationships:
0.0003≦B≦0.004%
0.0003≦S+Se+Sb≦0.008%.
34 . Alloy according to claim 33 , further characterized in that:
0.003≦Nb+Zr≦0.5%.
35 . Use of an alloy according to either of claim 33 or 34 for the manufacture of hyper-textured substrates for epitaxy.
36 . Hyper-textured substrate for epitaxy comprising an alloy according to either of claim 33 or 34 .