US2020140979A1PendingUtilityA1
Long durability high performance steel for structural, machine and tooling applications
Est. expiryDec 24, 2035(~9.4 yrs left)· nominal 20-yr term from priority
Inventors:Isaac Valls Anglés
C22C 38/56C22C 38/46C22C 38/001C22C 38/50C22C 38/24C22C 38/06C22C 38/12C22C 38/08B22F 3/15C22C 38/42C22C 38/44C22C 38/28C22C 38/00B22F 3/04C22C 38/58C22C 38/20C22C 38/04C22C 38/14C22C 38/52C22C 38/10C22C 38/38C22C 38/22B22F 3/1055B22F 10/25B22F 10/64B22F 2999/00B22F 10/20Y02P10/25
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Claims
Abstract
Steels, in particular hot work steels having high toughness even for high thickness, including steels having long durability combined with mechanical, tribological and thermal properties for highly demanding applications, and steels which can achieve a very good environmental resistance and resistance to certain aggressive media combined with other relevant properties, are described. These steels may also be obtained at low cost. A method for the manufacture of steels having high thickness and manufacturing methods to shape the materials of the invention through several steps, including an additive manufacturing step to manufacture at least a part of an intermediate mold, a mold or a model, a Cold Isostatic Pressing (CIP) step, the elimination of the mold and densification among other steps, are also described.
Claims
exact text as granted — not AI-modified1 . A steel having the following composition, all percentages in weight percent:
% C eq = 0.31-0.69
% C = 0.31-0.69
% N = 0-0.2
% B = 0-0.1
% Cr = 2.6-6.8
% Ni = 0-3
% Si = 0-1.8
% Mn = 0-5.8
% Al = 0-0.4
% Mo = 0-4.4
% W = 0-7.8
% Ti = 0-2
% Ta = 0-0.3
% Zr = 0-0.4
% Hf = 0-0.3
% V = 0-2.9
% Nb = 0-0.0
% Cu = 0-1.2
% Co = 0-2.9
% Moeq = 0.01-4.4
% La = 0-0.2
% Ce = 0-50.2
% Cs = 0-0.2
the rest consisting of iron and trace elements
wherein,
% Ceq=% C+0.86*% N+1.2*% B; and
% Moeq=% Mo+½% W;
With the proviso:
If % B<20 ppm or % Ni<0.25% then % Mn>0.8%
2 . A steel according to claim 1 , wherein:
% Mn>0.8%; and/or % P is less than 0.018%; and/or % S is less than 0.008% and/or % P+% S is less than 0.018%.
3 . A steel according to claim 1 wherein
% Mn>2.2%.
4 . (canceled)
5 . A steel according to claim 1 , wherein:
% P is less than 0.18%; and/or % S is less than 0.008%; and/or % P+% S is less than 0.18%.
6 . A steel having the following composition, all percentages in weight percent:
% C eq = 0.4-4
% C = 0.4-4
% N = 0-0.6
% B = 0-4
% Cr = 0-11
% Ni = 0-9.5
% Si = 0-4
% Mn = 10-40
% Al = 0-17
% Mo = 0-10
% W = 0-6.2
% Ti = 0-6.4
% Ta = 0-3
% Zr = 0-3
% Hf = 0-3
% V = 0-12
% Nb = 0-3
% Cu = 0-6
% Co = 0-7
% Lu = 0-2
% La = 0-2
% Ce = 0-2
% Nd = 0-2
% Gd = 0-2
% Sm = 0-2
% Y = 0-2
% Pr = 0-2
% Sc = 0-2
% Pm = 0-2
% Eu = 0-2
% Tb = 0-2
% Dy = 0-2
% Ho = 0-2
% Er = 0-2
% Tm = 0-2
% Yb = 0-2
% P = 0-2
% S = 0-2
the rest consisting of iron and trace elements
wherein,
% C sq =% C+0.86*% N+1.2*% B,
wherein % Al+% Si+% Cr+% V>2% and
if % C>0.9% then % Al<10%
7 . (canceled)
8 . A steel having the following composition, all percentages in weight percent:
% Ceq= 0.25-2.5
% C = 0.25-2.5
% N = 0-2
% B = 0-2
% Cr = 2.5-12
% Ni = 3-12
% Si = 0-2
% Mn = 0-3
% Al = 0.5-5
% Mo = 0-10
% W = 0-15
% Ti = 0-3.8
% Ta = 0-2
% Zr = 0-4
% Hf = 0-3
% V = 0-1
% Nb = 0-2.9
% Cu = 0-4
% Co = 0-7
% S = 0-2
% Se = 0-1
% Te = 0-1
% Bi = 0-1
% As = 0-1
% Sb = 0-1
% Ca = 0-1
% P = 0-2
% Pb = 0-2
% Cs = 0-2
% Sn = 0-2
the rest consisting of iron and trace elements,
wherein
% Ceq=% C+0.86*% N+1.2*% B,
With the proviso that:
when % Ceq=0.25-0.44%, then % V<0.85% and % Ti+% Hf+% Zr+% Ta<0.1%
when % Ceq=0.45-2.5%, then % V<0.6%;
9 - 12 . (canceled)
13 . A method for the manufacture of a steel according to claim 1 having a thickness of more than 303 mm comprising the following steps:
a) providing a steel according to claim 1 ;
b) applying to the steel a tempering treatment consisting on at least a partial austenization at a temperature above 980° C.; and
c) Optionally applying one or several machining steps and/or heat treatments below the austenization temperature of the material, (also including cryogenic treatments)
d) tempering the material at least once at a temperature above 520° C.,
e) Optionally applying one or several machining steps and/or heat treatments below the austenization temperature of the material, (also including cryogenic treatments).
14 . A method of manufacturing a component comprising a steel according to claim 1 , the method comprising the following steps:
Usage of an additive manufacturing method to manufacture a model a mold or an intermediate mold or partial mold, Filling at least part of the mold with particulate material comprising at least one metallic phase, Usage of a Cold Isostatic Pressing (CIP) step Elimination of the mold,
and a densification step which can be sintering, Hot Isostatic Pressing (HIP) or any other involving high enough temperatures.
15 . A method of manufacturing method a component comprising a steel according to claim 1 , the method comprising the following steps:
Usage of an additive manufacturing method to manufacture an intermediate mold or a part of an intermediate mold, optionally assembling this part of the intermediate mold to other parts, Filling at least part of the mold with particulate material comprising at least one metallic phase, Manufacturing a cover mold with a very flexible material using the filled intermediate AM fabricated mold of the previous steps, Usage of a Cold Isostatic Pressing (CIP) step Elimination of the mold, and a densification step which can be sintering, Hot Isostatic Pressing (HIP) or any other involving high enough temperatures.
16 . A steel according to claim 1 wherein:
% Gd+% Nd+% Sm+% Y+% Pr+% Sc+% Pm+% Eu+% Tb+% Dy+% Ho+% Er+% Tm+% Yb+% Lu=0-0.5%.
17 . A steel according to claim 1 wherein:
Mn+Cr>2.8.
18 . A steel according to claim 1 wherein % Cr is between 2.9 and 5.9%.
19 . A steel according to claim 1 wherein:
% V>0.22.
20 . A steel according to claim 1 wherein:
% Mo<1.9.
21 . A steel according to claim 1 wherein:
% Mn>0.8.
22 . A steel according to claim 1 wherein:
% C<0.48.
23 . A steel according to claim 1 wherein:
% Cr>3.6.
24 . A steel according to claim 1 wherein:
% V+% Al+% Ti>0.1.
25 . A steel according to claim 1 wherein:
% Moeq<1.9.
26 . A steel according to claim 1 wherein:
% Zr+% Hf+% Nb+% Ta>0.01.Join the waitlist — get patent alerts
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