US2025340971A1PendingUtilityA1
Low cost high performant tool steels
Est. expiryFeb 8, 2039(~12.5 yrs left)· nominal 20-yr term from priority
Inventors:Isaac Valls Anglés
C22C 38/54C22C 38/50C22C 38/46C22C 38/44C22C 38/06C22C 38/02C22C 38/001C21D 2211/008C21D 2211/004C22C 38/38C22C 38/34C22C 38/32C22C 38/28C22C 38/58C22C 38/22
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Claims
Abstract
The present invention relates to very high performant tool steels which can be produced at low cost. The high performance is achieved through an exceptional combination of thermo-mechanical properties attained trough novel alloying and microstructural guidelines. Several of the tool steels of the present invention can be obtained in large cross-section without significant deterioration of the most relevant properties.
Claims
exact text as granted — not AI-modified1 . A steel, in particular a tool steel, having the following composition, all percentages being in % wt,
% C eq =
% C =
% N =
% B =
0.15 - 1.49
0.15 - 1.49
0 - 0.49
0 - 0.49
% Cr = 0 - 14
% Ni = 0 - 4.9
% Si = 0 - 1.9
% Mn = 0 - 2.8
% Al = 0 - 0.9
% Mo = 0 - 5.9
% W = 0 - 4.9
% Ti = 0 - 4.9
% Ta = 0 - 0.4
% Zr = 0 - 0.9
% Hf = 0 - 0.3
% V = 0 - 3.9
% Nb =
% Cu =
% Co =
% Mo eq =
0 - 1.4
0 - 1.9
0 - 2.9
0.26 - 5.9
% La = 0 - 0.3
% Ce = 0 - 0.3
% Nd = 0 - 0.3
% Gd = 0 - 0.3
% Sm = 0 - 0.3
% Y = 0 - 0.3
% Pr = 0 - 0.3
% Sc = 0 - 0.2
% Pm = 0 - 0.3
% Eu = 0 - 0.3
% Tb = 0 - 0.3
% Dy = 0 - 0.3
% Ho = 0 - 0.3
% Er = 0 - 0.3
% Tm = 0 - 0.3
% Yb = 0 - 0.3
% Lu = 0 - 0.3
% Cs = 0 - 0.3
the rest consisting of iron and trace elements, wherein
%
Ceq
=
%
C
+
0.86
*
%
N
+
1.2
*
%
B
,
and
%
Mo
eq
=
%
Mo
+
1
/
2
*
%
W
,
With the proviso that:
When % Ceq=0.15-0.55, then % Ni+% Mn=0.3-1.9; and
When % Ceq=0.15-0.55, then % Cr≤1.9; and
When % Ceq=0.15-0.55, then % MO eq ≥0.6; and
When % Ceq=0.15-0.55, then the steel presents a microstructure which is characterized by a thermal diffusivity at room temperature of at least 9.6 mm 2 /s; and
When % Ceq=0.55-1.49, not including the lower limit, then % Ti≥0.12; and
When % Ceq=0.55-1.49, not including the lower limit, then % Cr≥2.1; and
When % Ceq=0.55-1.49, not including the lower limit, then % Mn+% Si=0.04-3.9.
2 . The steel according to claim 1 , in particular a hot work and/or plastic injection moulding tool steel, having the following composition, all percentages being in % wt,
% C eq =
% C =
% N =
% B =
0.15 - 0.55
0.15 - 0.55
0 - 0.3
0 - 0.2
% Cr = 0 - 1.9
% Ni = 0 - 1.4
% Si = 0 - 0.49
% Mn = 0 - 1.4
% Al = 0 - 0.5
% Mo = 0 - 2.9
% W = 0 - 2.9
% Ti = 0 - 0.9
% Ta = 0 - 0.3
% Zr = 0 - 0.9
% Hf = 0 - 0.3
% V = 0 - 0.4
% Nb = 0 - 0.3
% Cu = 0 - 1.9
% Co = 0 - 2
% Mo eq = 0.6 - 2.9
% La = 0 - 0.3
% Ce = 0 - 0.3
% Nd = 0 - 0.3
% Gd = 0 - 0.3
% Sm = 0 - 0.3
% Y = 0 - 0.3
% Pr = 0 - 0.3
% Sc = 0 - 0.2
% Cs = 0 - 0.3
% Eu = 0 - 0.3
the rest consisting of iron and trace elements, wherein
%
Ceq
=
%
C
+
0.86
*
%
N
+
1.2
*
%
B
,
and
%
Mo
eq
=
%
Mo
+
1
/
2
*
%
W
,
and
wherein
%
Ni
+
%
Mn
=
0.3
-
1.9
,
wherein the steel presents a microstructure which is characterized by a thermal diffusivity at room temperature of at least 9.6 mm 2 /s, and wherein the microstructure comprises at least 76% bainite.
3 . The steel according to claim 1 , wherein % B is higher than 11 ppm by weight.
4 . The steel according to claim 1 , wherein % B is higher than 21 ppm by weight.
5 . The steel according to claim 1 , wherein % B is lower than 0.035% by weight.
6 . The steel according to claim 1 , wherein (% Moeq)/(% Mn+% Ni)=0.7-10% by weight.
7 . The steel according to claim 1 , wherein % V is 0.002% by weight or higher.
8 . The steel according to claim 1 , wherein % V is 1.4% by weight or less.
9 . The steel according to claim 1 , wherein the sum of all trace elements is less than 1.4% by weight.
10 . The steel according to claim 1 , wherein the steel presents a microstructure which is characterized by a thermal diffusivity at room temperature of at least 13 mm 2 /s.
11 . The steel according to claim 2 , wherein % B is higher than 11 ppm by weight.
12 . The steel according to claim 2 , wherein % B is higher than 21 ppm by weight.
13 . The steel according to claim 2 , wherein % B is lower than 0.035% by weight.
14 . The steel according to claim 2 , wherein % Si is 0.001% by weight or higher.
15 . The steel according to claim 2 , wherein % Mn is 0.001% by weight or higher.
16 . The steel according to claim 2 , wherein % Mn is less than 0.9% by weight.
17 . The steel according to claim 2 , wherein (% Moeq)/(% Mn+% Ni)=0.7-10% by weight.
18 . The steel according to claim 2 , wherein the sum of all trace elements is less than 1.4% by weight.
19 . The steel according to claim 2 , wherein the microstructure of the steel comprises at least a 20% high temperature bainite.
20 . The steel according to claim 2 , wherein the steel presents a microstructure which is characterized by a thermal diffusivity at room temperature of at least 13 mm 2 /s.Join the waitlist — get patent alerts
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