US2017096719A1PendingUtilityA1
Extremely high conductivity low cost steel
Est. expiryMar 18, 2034(~7.6 yrs left)· nominal 20-yr term from priority
Inventors:Isaac Valls Anglés
C22C 38/10C22C 38/12C22C 38/005C21D 2211/002C22C 38/44C22C 38/02C22C 38/22C21D 6/004C21D 2211/003C22C 38/002C22C 38/28C22C 38/06C22C 38/16C22C 38/08C21D 1/20C21D 1/25C22C 38/04C21D 6/008C21D 6/007C21D 6/005C22C 33/0257C22C 38/46B22F 2998/10C22C 38/14C22C 38/54C22C 38/42C22C 38/52C22C 38/50C22C 38/58
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Claims
Abstract
The present invention relates to tool steels which present an extremely high conductivity while maintaining high levels of mechanical properties the manufacturing process thereof. Tool steels of the present invention are able to undergo low temperature hardening treatments with good homogeneity of the microstructure and can be obtained at low cost.
Claims
exact text as granted — not AI-modified1 . A steel, in particular a hot work tool steel, having the following composition, all percentages being in % wt,
% C eq = 0.15-2.0
% C = 0.15-2.0
% N = 0-0.6
% B = 0-4
% Cr = 0-11
% Ni = 0-12
% Si = 0-2.5
% Mn = 0-3
% Al = 0-2.5
% Mo = 0-10
% W = 0-10
% Ti = 0-2
% Ta = 0-3
% Zr = 0-4
% Hf = 0-3
% V = 0-12
% Nb = 0-3
% Cu = 0-2
% Co = 0-12
% Mo eq = 1.5-10
% 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
% Lu = 0-2
the rest consisting of iron and trace elements, wherein
% C eq =% C+0.86*% N+1.2*% B, and
% Mo+½·% W
presenting a microstructure which is characterized by a thermal diffusivity at room temperature of at least 12 mm 2 /s.
2 . A steel according to claim 1 , wherein % B is higher than 1 ppm.
3 . A steel according to claim 1 , wherein % B is lower than 3.5%.
4 . A steel according to claim 1 , wherein % Zr=0.05-1.5%.
5 . A steel according to claim 1 , wherein % W<1.
6 . A steel according to claim 1 , wherein % Mo eq <4.4 and % Ni<0.75.
7 . A steel according to claim 1 , wherein C eq <0.1.
8 . A steel according to claim 1 , wherein % Mo>1.2.
9 . A steel according to claim 1 , wherein % Cr<4.8.
10 . A steel according to claim 1 , wherein % C>0.32.
11 . A steel according to claim 1 , wherein % Cr>8.6 and % Zr>0.8.
12 . A steel according to claim 1 , wherein % Cr>8.6, % Zr>0.8 and % C>0.2.
13 . A steel according to claim 1 , carbide formers stronger than iron except Nb, Hf and should be avoided, and the sum of % Ta+% Ti<0.8.
14 . A steel according to claim 1 , wherein % Cr<1.8.
15 . A steel according to claim 1 wherein % B>3 ppm and % Co<9% wt.
16 . A steel according to claim 1 , wherein % Cr<2.8.
17 . A steel according to claim 1 , wherein Mn<0.8%.
18 . A steel according to claim 1 , wherein Mn<0.8% and Cr>2.8.
19 . A steel according to claim 1 , wherein Mn<0.8%, Cr>2.8 and B>52 ppm.
20 . A steel according to claim 1 , wherein Mn<0.8%, Cr>2.8, B>52 ppm and the sum of all Rare Earth Elements (REE) is >60 ppm.
21 . A steel according to claim 1 , wherein the sum of all REE is at least 7 ppm.
22 . A steel according to claim 1 , wherein the sum of all REE is at least 12 ppm.
23 . A steel according to claim 1 , wherein the sum of all REE is at least 220 ppm.
24 . A steel according to claim 1 , wherein the sum of all REE is at least 603 ppm.
25 . A steel according to claim 1 , wherein % La is at least 4 ppm.
26 . A steel according to claim 1 , wherein % La is at least 23 ppm.
27 . A steel according to claim 1 , wherein % La is at least 100 ppm.
28 . A steel according to claim 1 , wherein % Ce is at least 5 ppm.
29 . A steel according to claim 1 , wherein % Ce is at least 53 ppm.
30 . A steel according to claim 1 , wherein % Ce is at least 150 ppm.
31 . A steel according to claim 1 , wherein % Sm is at least 2 ppm.
32 . A steel according to claim 1 , wherein % Sm is at least 43 ppm.
33 . A steel according to claim 1 , wherein % Sm is at least 90 ppm.
34 . A steel according to claim 1 , wherein % Y is at least 9 ppm.
35 . A steel according to claim 1 , wherein % Y is at least 67 ppm.
36 . A steel according to claim 1 , wherein % Y is at least 200 ppm.
37 . A steel according to claim 1 , wherein % Gd is at least 2 ppm.
38 . A steel according to claim 1 , wherein % Gd is at least 53 ppm.
39 . A steel according to claim 1 , wherein % Gd is at least 98 ppm.
40 . A steel according to claim 1 , wherein % Nd is at least 16 ppm.
41 . A steel according to claim 1 , wherein % Nd is at least 98 ppm.
42 . A steel according to claim 1 , wherein % Nd is at least 167 ppm.
43 . A steel according to claim 1 , wherein % B>7 ppm and % Ni is 0.2-1.8% wt.
44 . A steel according to claim 1 , wherein % B>7 ppm and % Ni is 0.3-0.8% wt.
45 . A steel according to claim 1 , wherein % Nb and/or % Zr is 1 ppm-30 ppm.
46 . A steel according to claim 1 , wherein % Nb and/or % Zr is 2 ppm-16 ppm.
47 . A steel according to claim 1 , wherein when % Cr<4.8 then % Mo>1.2.
48 . A steel according to claim 1 , wherein any REE is present and % Cr<0.8%.
49 . A steel according to claim 1 , wherein any REE is present and % Cr>2.8%.
50 . A steel according to claim 1 , wherein any REE is present and % V<12%.
51 . A steel according to claim 1 , wherein any REE is present and % V>0.2%.
52 . A steel according to claim 1 , wherein any REE is present and % Mo<1.5%.
53 . A steel according to claim 1 , wherein any REE is present and % Mo>2.5%.
54 . A steel according to claim 1 , wherein any REE is present and % Ceq<0.56%.
55 . A steel according to claim 1 , wherein any REE is present and % Ceq>0.28%.
56 . A steel according to claim 1 , wherein any REE is present and % W<1.6%.
57 . A steel according to claim 1 , wherein any REE is present and % W>2.3%.
58 . A steel according to claim 1 , wherein any REE is present and % Ni<4%.
59 . A steel according to claim 1 , wherein any REE is present and % Ni>0.1%.
60 . A steel according to claim 1 , wherein any REE is present and % Moeq<2.3%.
61 . A steel according to claim 1 , wherein any REE is present and % Moeq>3.7%.
62 . A steel according to claim 1 , wherein any REE is present and % B<1.64%.
63 . A steel according to claim 1 , wherein any REE is present and % B>3 ppm.
64 . A steel according to claim 1 , wherein any REE is present and % Zr<3%.
65 . A steel according to claim 1 , wherein any REE is present and % Zr>0.03%.
66 . A steel according to claim 1 , wherein % B is more than 10 ppm.
67 . A steel according to claim 1 , wherein % B is more than 25 ppm.
68 . A steel according to claim 1 , wherein % B is more than 50 ppm.
69 . A steel according to claim 1 , wherein % B is more than 72 ppm.
70 . A steel according to claim 1 , wherein % B is more than 94 ppm.
71 . A steel according to claim 1 , wherein % B is more than 560 ppm.
72 . A steel according to claim 1 , wherein % B is lower than 1400 ppm.
73 . A steel according to claim 1 , wherein % B is lower than 1400 ppm.
74 . A steel according to claim 1 , wherein % B is lower than 598 ppm.
75 . A steel according to claim 1 , wherein % B is lower than 285 ppm.
76 . A steel according to claim 1 , wherein % B is lower than 68 ppm.
77 . A steel according to claim 1 , wherein % B is lower than 48 ppm.
78 . A steel according to claim 1 , wherein % B is lower than 27 ppm.
79 . A steel according to claim 1 , with the proviso that when 0.4<C eq <0.65, then Mo eq <9.5 or V>0.15.
80 . A steel according to claim 1 , wherein % Cu+% Ni is higher than 0.1%.
81 . A steel according to claim 1 , wherein % Zr+% Hf+% Ta is higher than 0.3%.
82 . A steel according to claim 1 , wherein % Nb+% Ti+% V is higher than 0.2.
83 . A steel according to claim 1 , wherein when % Mo eq <4.2, then % V is higher than 0.05%.
84 . A steel according to claim 1 , wherein the microstructure of the steel comprises at least 50% vol bainite.
85 . A steel according to claim 1 , wherein the microstructure of the steel comprises at least 20% of High Temperature bainite, wherein High Temperature bainite, refers to any microstructure formed at temperatures above the temperature corresponding to the bainite nose in the TTT diagram but below the temperature where the ferritic/perlitic transformation ends, but excluding lower bainite which can occasionally be formed in small amounts in isothermal treatments at temperatures above the one of the bainitic nose.
86 . A process of manufacturing of a steel comprising subjecting a steel according to claim 1 , upon formation of the bainite, to tempering with at least one tempering cycle at a temperature above 500° C. to ensure that a significant portion of the cementite is replaced by carbide-like structures containing carbide formers stronger than iron.Join the waitlist — get patent alerts
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