Austenitic stainless cast steel part, method for production and use thereof
Abstract
A rustproof austenitic cast steel part having tensile strength greater than 550 MPA and elongation at break over 30%, is characterised in that the cast steel having an aluminium content of 0 to 4% and a silicon content of 1 to 4% is within an alloying range that is determined by the coordinates of four points (Cr equiv. =14; Ni equiv. =8), (Cr equiv. =14; Ni equiv. =14), (Cr equiv. =22; Ni equiv. =8) and (Cr equiv. =22 Ni equiv. =16), wherein the chromium and nickel equivalents are calculated from the chemical composition of a cast steel using the relations (1) and (2): Cr equiv . = % Cr + % Mo + 1.5 % Si + 0.5 % W + 0.9 % Nb + 4 % A 1 + 4 % Ti + 1.5 % V + 0 .9 % Ta ( 1 ) Ni equiv . = % Ni + 30 % C + 18 % N + 0.5 % Mn + 0.3 % Co + 0.2 % Cu - 0.2 % A 1 ( 2 ) wherein the figures must be quoted in mass percent and the remainder substantially comprises iron and other elements usually present in cast steel (O, P, S). Said cast steel exhibits a TRIP effect and serves as a material for plant and refrigeration engineering, particularly for facilities and components for obtaining gases and for liquefying and fractioning of gases, and as a material in the construction of special vehicles and airplanes for the transport of liquid gases and for components exposed to low temperatures, in addition to crash stressed castings.
Claims
exact text as granted — not AI-modified1 . An austenitic stainless cast steel part having an aluminium content of greater than 0% and equal or smaller than 4% and a silicon content of 0 to 4%, and tensile strength greater than 550 MPa and elongation at break greater than 30% produced in an alloying range determined by the coordinates of four points (Cr equiv. =14; Ni equiv. =8), (Cr equiv. =14; Ni equiv. =14), (Cr equiv. =22; Ni equiv. =8) and (Cr equiv. =22 Ni equiv. =16), wherein the chromium and nickel equivalent are calculated via relation (1) and (2)
Cr
equiv
.
=
%
Cr
+
%
Mo
+
1.5
%
Si
+
0.5
%
W
+
0.9
%
Nb
+
4
%
A
1
+
4
%
Ti
+
1.5
%
V
+
0
.9
%
Ta
(
1
)
Ni
equiv
.
=
%
Ni
+
30
%
C
+
18
%
N
+
0.5
%
Mn
+
0.3
%
Co
+
0.2
%
Cu
-
0.2
%
A
1
(
2
)
from the chemical composition of the cast steel part, where the figures must be quoted in mass percent and the rest essentially consists of iron and other inevitable elements of cast steel part and that this cast steel part exhibits a TRIP effect under load.
2 . The cast steel part in accordance with claim 1 , characterised by the fact that
the manganese content is 0 to 25%; the chromium content is 12 to 20%; the nickel content is 0 to 12%; the niobium content is 0 to 1.2%; the tantalum content is 0 to 0.2%; the carbon content is 0.01 to 0.15%; the nitrogen content is 0.005 to 0.5%; the copper content is 0 to 4%; the cobalt content is 0 to 1%; the molybdenum content is 0 to 4%; the tungsten content is 0 to 3%; the titanium content is 0 to 1%; and the vanadium content is 0 to 0.15%.
3 . The cast steel part in accordance with claim 2 , characterised by the fact that
the manganese content is 5 to 12%; the nickel content is 2 to 8%; the copper content is 0 to 2%; the cobalt content is 0 to 0.5%; the molybdenum content is 0 to 2.5%; and/or the vanadium content is 0 to 0.5%.
4 . The cast steel part in accordance with claim 3 , characterised by the fact that
the chromium content is 16.5%; the nickel content is 6.5%; the silicon content is 1.1%; the manganese content is 7%; the aluminium content is 0.05%; the nitrogen content is 0.1%; and the carbon content is 0.04%.
5 . A method for producing a cast steel part comprising the following steps: Provision of an alloy comprising an aluminium content of 0 to 4% and a silicon content of 0 to 4%, with the alloy produced in an alloying range determined by the coordinates of four points (Cr equiv. =14; Ni equiv. =8), (Cr equiv. =14; Ni equiv. =14), (Cr equiv. =22; Ni equiv. =8) and (Cr equiv. =22; Ni equiv. =16), with the chromium and nickel equivalent being calculated via relation (1) and (2)
Cr
equiv
.
=
%
Cr
+
%
Mo
+
1.5
%
Si
+
0.5
%
W
+
0.9
%
Nb
+
4
%
A
1
+
4
%
Ti
+
1.5
%
V
+
0
.9
%
Ta
(
1
)
Ni
equiv
.
=
%
Ni
+
30
%
C
+
18
%
N
+
0.5
%
Mn
+
0.3
%
Co
+
0.2
%
Cu
-
0.2
%
A
1
(
2
)
from the chemical composition of the cast steel part, wherein the figures must be quoted in mass percent and the rest essentially consists of iron and other inevitable elements of cast steel; and
the casting steel part is cast in a casting mould.
6 . The method in accordance with claim 5 , characterised by the fact that the cast steel part undergoes a heat treatment process in a further step.
7 . The method in accordance with claim 5 , characterised by the fact that the alloy has
a manganese content of 0 to 25%; a chromium content of 12 to 20%; a nickel content of 0 to 12%; a niobium content of 0 to 1.2%; a tantalum content of 0 to 0.2%; a carbon content is 0.01 to 0.15%; a nitrogen content of 0.005 to 0.5%; a copper content of 0 to 4%; a cobalt content of 0 to 1%; a molybdenum content of 0 to 4%; a tungsten content of 0 to 3%; a titanium content of 0 to 1%; and a vanadium content of 0 to 0.15%.
8 . The method in accordance with claim 7 , characterised by the fact that the alloy has
a manganese content of 5 to 12%; a nickel content of 2 to 8%; a copper content of 0 to 2%; a cobalt content of 0 to 0.5%; a molybdenum content of 0 to 2.5%; and/or a tungsten content of 0 to 0.5%.
9 . A cast steel part, produced by a method in accordance with claim 5 , characterised by the fact that the cast steel part has a tensile strength greater than 550 MPa and an elongation at break greater than 30%.
10 . A cast steel part, produced by a method in accordance with claim 5 , characterised by the fact that the cast steel part exhibits a TRIP effect under load.
11 . A method for using a cast steel part in a technical application, comprising the steps:
Performance of the steps of one of the methods in accordance with claim 5 for the manufacture of the cast steel part; and use of the cast steel part in the technical application, wherein use after casting proceeds without the performance of a chipless cutting process.
12 . Use of the cast steel part in accordance with claim 1 as material for plant and refrigeration engineering.
13 . Use of the cast steel part in accordance with claim 1 as material for plant and components for producing gases and for liquefying and fractionating gases.
14 . Use of the cast steel part in accordance with claim 1 as material for applications in automotive and aircraft construction.
15 . Use of the cast steel part in accordance with claim 1 as material for crash-stressed parts, such as crash boxes in motor vehicles.
16 . Use of the cast steel part in accordance with claim 1 as material for transporting liquid gases and as a component that is exposed to low temperatures.
17 . Use of the cast steel part in accordance with claim 1 as casting steel foam for foamed parts.
18 . Component for automotive or aircraft construction, especially, crash box, A, B or C-pillar of a motor vehicle, which is formed as a cast steel part in accordance with claim 1 .
19 . The method in accordance with claim 6 , characterised by the fact that the alloy has
a manganese content of 0 to 25%; a chromium content of 12 to 20%; a nickel content of 0 to 12%; a niobium content of 0 to 1.2%; a tantalum content of 0 to 0.2%; a carbon content is 0.01 to 0.15%; a nitrogen content of 0.005 to 0.5%; a copper content of 0 to 4%; a cobalt content of 0 to 1%; a molybdenum content of 0 to 4%; a tungsten content of 0 to 3%; a titanium content of 0 to 1%; and a vanadium content of 0 to 0.15%.
20 . The method in accordance with claim 19 , characterised by the fact that the alloy has
a manganese content of 5 to 12%; a nickel content of 2 to 8%; a copper content of 0 to 2%; a cobalt content of 0 to 0.5%; a molybdenum content of 0 to 2.5%; and/or a tungsten content of 0 to 0.5%.
21 . A cast steel part, produced by a method in accordance with claim 7 , characterised by the fact that the cast steel part has a tensile strength greater than 550 MPa and an elongation at break greater than 30%.
22 . A cast steel part, produced by a method in accordance with claim 19 , characterised by the fact that the cast steel part has a tensile strength greater than 550 MPa and an elongation at break greater than 30%.
23 . A cast steel part, produced by a method in accordance with claim 8 , characterised by the fact that the cast steel part has a tensile strength greater than 550 MPa and an elongation at break greater than 30%.
24 . A cast steel part, produced by a method in accordance with claim 20 , characterised by the fact that the cast steel part has a tensile strength greater than 550 MPa and an elongation at break greater than 30%.
25 . A cast steel part, produced by a method in accordance with claim 7 , characterised by the fact that the cast steel part exhibits a TRIP effect under load.
26 . A cast steel part, produced by a method in accordance with claim 19 , characterised by the fact that the cast steel part exhibits a TRIP effect under load.
27 . A cast steel part, produced by a method in accordance with claim 8 , characterised by the fact that the cast steel part exhibits a TRIP effect under load.
28 . A cast steel part, produced by a method in accordance with claim 20 , characterised by the fact that the cast steel part exhibits a TRIP effect under load.
29 . Use of the cast steel part in accordance with claim 2 as material for plant and refrigeration engineering.
30 . Use of the cast steel part in accordance with claim 2 as material for plant and components for producing gases and for liquefying and fractionating gases.
31 . Use of the cast steel part in accordance with claim 2 as material for applications in automotive and aircraft construction.
32 . Use of the cast steel part in accordance with claim 2 as material for crash-stressed parts, such as crash boxes in motor vehicles.
33 . Use of the cast steel part in accordance with claim 2 as material for transporting liquid gases and as a component that is exposed to low temperatures.
34 . Use of the cast steel part in accordance with claim 2 as casting steel foam for foamed parts.
35 . Component for automotive or aircraft construction, especially, crash box, A, B or C-pillar of a motor vehicle, which is formed as a cast steel part in accordance with claim 2 .
36 . Use of the cast steel part in accordance with claim 3 as material for plant and refrigeration engineering.
37 . Use of the cast steel part in accordance with claim 3 as material for plant and components for producing gases and for liquefying and fractionating gases.
38 . Use of the cast steel part in accordance with claim 3 as material for applications in automotive and aircraft construction.
39 . Use of the cast steel part in accordance with claim 3 as material for crash-stressed parts, such as crash boxes in motor vehicles.
40 . Use of the cast steel part in accordance with claim 3 as material for transporting liquid gases and as a component that is exposed to low temperatures.
41 . Use of the cast steel part in accordance with claim 3 as casting steel foam for foamed parts.
42 . Component for automotive or aircraft construction, especially, crash box, A, B or C-pillar of a motor vehicle, which is formed as a cast steel part in accordance with claim 3 .
43 . Use of the cast steel part in accordance with claim 4 as material for plant and refrigeration engineering.
44 . Use of the cast steel part in accordance with claim 4 as material for plant and components for producing gases and for liquefying and fractionating gases.
45 . Use of the cast steel part in accordance with claim 4 as material for applications in automotive and aircraft construction.
46 . Use of the cast steel part in accordance with claim 4 as material for crash-stressed parts, such as crash boxes in motor vehicles.
47 . Use of the cast steel part in accordance with claim 4 as material for transporting liquid gases and as a component that is exposed to low temperatures.
48 . Use of the cast steel part in accordance with claim 4 as casting steel foam for foamed parts.
49 . Component for automotive or aircraft construction, especially, crash box, A, B or C-pillar of a motor vehicle, which is formed as a cast steel part in accordance with claim 4 .
50 . Use of the cast steel part in accordance with claim 9 as material for plant and refrigeration engineering.
51 . Use of the cast steel part in accordance with claim 9 as material for plant and components for producing gases and for liquefying and fractionating gases.
52 . Use of the cast steel part in accordance with claim 9 as material for applications in automotive and aircraft construction.
53 . Use of the cast steel part in accordance with claim 9 as material for crash-stressed parts, such as crash boxes in motor vehicles.
54 . Use of the cast steel part in accordance with claim 9 as material for transporting liquid gases and as a component that is exposed to low temperatures.
55 . Use of the cast steel part in accordance with claim 9 as casting steel foam for foamed parts.
56 . Component for automotive or aircraft construction, especially, crash box, A, B or C-pillar of a motor vehicle, which is formed as a cast steel part in accordance with claim 9 .
57 . Use of the cast steel part in accordance with claim 10 as material for plant and refrigeration engineering.
58 . Use of the cast steel part in accordance with claim 10 as material for plant and components for producing gases and for liquefying and fractionating gases.
59 . Use of the cast steel part in accordance with claim 10 as material for applications in automotive and aircraft construction.
60 . Use of the cast steel part in accordance with claim 10 as material for crash-stressed parts, such as crash boxes in motor vehicles.
61 . Use of the cast steel part in accordance with claim 10 as material for transporting liquid gases and as a component that is exposed to low temperatures.
62 . Use of the cast steel part in accordance with claim 10 as casting steel foam for foamed parts.
63 . Component for automotive or aircraft construction, especially, crash box, A, B or C-pillar of a motor vehicle, which is formed as a cast steel part in accordance with claim 10 .Cited by (0)
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