US2016138145A1PendingUtilityA1
Cold work tool steel with outstanding weldability
Est. expiryJan 12, 2027(~0.5 yrs left)· nominal 20-yr term from priority
Inventors:Isaac Valls
C22C 38/44C22C 38/04C22C 38/06C22C 38/52C22C 38/40C22C 38/002C22C 38/02C22C 38/46C22C 38/50C22C 38/58
50
PatentIndex Score
0
Cited by
0
References
0
Claims
Abstract
A cold work tool steel with average or above wear resistance, a hardness in excess of 60 HRc and a very good toughness but with considerably lower carbon contents leading to highly improved weldability is obtained by combining the presence of primary carbides (or alternatively nitrides and/or borides) with other strengthening mechanisms like precipitation hardening or even solid solution. Vanadium rich MC type carbides, modified with refractory metal additions, present the best compromise of hardness and fracture toughness for several applications, while for other applications harder carbides, such as Ti carbides or Ti mixed carbides (primarily with V, Mo and/or W) will be the preferred ones, alternatively using Zr and Hf mixed carbides.
Claims
exact text as granted — not AI-modified1 . An at least partly martensitic cold work tool steel having the following composition, all percentages being in weight percent:
% Ceq = 0.25-2.5
% C = 0.25-2.5
% N = 0-2%
B = 0-2
% Cr = 0.1-10
% Ni = 4.3-12
% Si = 0.01-1.0
% Mn = 0.08-3
% Al = 0.5-5
% Mo = 0-10
% W = 0-15
% Ti = 0-3
% Ta = 0-2
% Zr = 0-2
% Hf = 0-2,
% V = 0-12
% Nb = 0-2
% Cu = 0-4
% Co = 0-8,
% S = 0-1%
Se = 0-1
% Te = 0-1
% Bi = 0-1
% As = 0-1
% Sb = 0-1
% Ca = 0-1,
the rest consisting of iron and unavoidable impurities, wherein
% Ceq=% C+0.86*% N+1.2*% B,
characterized in that
% Cr+% V+% Mo+% W>3 and
% Al+% Mo+% Ti>1.5,
with the proviso that
when % Ceq=0.45-2.5, then % V=0.6-12; or
when % Ceq=0.25-0.45, then % V=0.85-4; or
when % Ceq=0.25-0.45, then % Ti+% Hf+% Zr+% Ta=0.1-4 and
wherein the steel contains Ni-based intermetallic compounds.
2 . The steel according to claim 1 , wherein, when % Ceq=0.45-2.5 and % Cr<2.5, then the % V=0.6-12 is replaced by % Mo+2% W=1.5-17.
3 . The steel according to claim 1 , wherein % Al=1-5.
4 . The steel according to claim 1 , wherein:
% Ceq = 0.45-1.95
% Cr = 1-8
% V = 0.6-6
% Ni = 4.3-9
% Si = 0.01-1.0
% Mn = 0.08-2
% Al = 1-3.5
% Mo = 0-6
% W = 0-12
% Ti = 0-3
% Co = 0-6
% Cu = 0-2, and
% Hf + % Zr + % Ta + % Nb = 0-2.
5 . The steel according to claim 1 , wherein:
% Ceq = 0.25-0.43
% Cr = 0.1-8
% V = 0.85-4
% Ni = 4.3-9
% Si = 0.01-1.0
% Mn = 0.08-2
% Al = 1-3.5
% Mo = 0-6
% W = 0-12
% Ti = 0-3
% Co = 0-6
% Cu = 0-2, and
% Ti + % Zr + % IIf = 0.1-4.
6 . The steel according to claim 1 , wherein:
% Ceq = 0.45-0.6
% V = 0.6-4
% Ni = 4.3-8
% Si = 0.05-1.0
% Mn = 0.08-2
% Al = 1-2.5
% Mo = 0.3-3
% W = 0-2
% Ti = 0.1-1.5
% Co = 1-3.5
% Cu = 0-2, and
% Hf + % Zr + % Ta + % Nb = 0-0.5.
7 . The steel according to claim 1 , wherein:
% Ceq = 0.25-0.43
% V = 0.85-4
% Mn = 0.08-2
% Al = 1-2.5
% Ti = 0.1-1.5
% Co = 1-3.5
% Ni = 4.3-8
% Si = 0.01-1.0
% Mo = 0.3-3
% W = 0-2
% Cu = 0-2, and
% Ti + % Zr + % Hf = 0.1-4.
8 . The steel according to claim 1 , wherein:
% Ceq = 0.45-1.2
% Si = 0.05-1.0
% W = 0-5
% Cr = 0.1-8
% V = 0.6-4
% Ni = 4.3-10
% Mn = 0.08-3
% Al = 1-3
% Mo = 0.3-5
% Ti = 0.1-3
% Co = 0-8
% Cu = 0-4
and % Hf + % Zr + % Ta + % Nb = 0-2.
9 . The steel according to claim 1 , wherein:
% Ceq = 0.25-0.43
% V = 0.85-4
% Cr = 0.1-8
% Ni = 4.3-10
% Si = 0.05-1.0
% Mn = 0.08-3
% Al = 1-3
% Mo = 0.3-5
% W = 0-5
% Ti = 0.1-3
% Co = 0-8
% Cu = 0-4, and
% Ti + % Zr + % Hf = 0.1-4.
10 . The steel according to claim 1 , wherein:
% Ceq =
% Cr = 1-4
% V = 0.6-3
% Ni = 4.3-9
0.45-0.55
% Si = 0.05-1.0
% Mn = 0.08-0.5
% Al = 1.5-2.5
% Mo = 0.8-1.5
% W = 0-2
% Ti = 0.1-1.2
% Co = 0-8
% Cu = 0-4, and
% Hf + % Zr + % Ta + % Nb = 0-2.
11 . The steel according to claim 1 , wherein:
% Ceq = 0.25-0.43
% V = 0.85-4
% Si = 0.01-1.0
% Mn = 0.08-0.5
% W = 0-2
% Ti = 0.3-1.2
% Cr = 1-4
% Co = 0-8
% Al = 1.5-2.5
% Ni = 4.3-9
% Mo = 0.8-1.5
% Cu = 0-4, and
% Ti + % Zr + % Hf = 0.1-4.
12 . The steel according to claim 1 , wherein:
% Ceq = 0.8-2.5
% Cr = 2-8
% V = 2-12
% Ni = 5-8
% Si = 0.05-1.0
% Mn = 0.08-3
% Al = 1.5-3
% Mo = 1-10
% W = 0-15
% Ti = 0.3-3
% Co = 0-14
% Cu = 0-4, and
% Hf + % Zr + % Ta + % Nb = 0-2.
13 . The steel according to claim 1 , wherein:
% Ceq = 0.45-0.55
% Cr = 2-5
% V = 1-3.5
% Ni = 4.3-7
% Si = 0.05-1.0
% Mn = 0.08-2
% Al = 0.5-2
% Mo = 0-3
% W = 0-2
% Ti = 0-1.5
% Co = 0-2.5
% Cu = 0-4
and % Hf + % Zr + % Ta + % Nb = 0-2.
14 . The steel according to claim 1 , wherein:
% Ceq = 0.25-0.43
% V = 1-4
% Cr = 2-5
% Ni = 4.3-7
% Si = 0.05-1.0
% Mn = 0.08-2
% Al = 0.5-2
% Mo = 0-3
% W = 0-2
% Ti = 0-1.5
% Co = 0-2.5
% Cu = 0-4, and
% Ti + % Zr + % Hf = 0.1-4.
15 . The steel according to claim 1 , wherein:
% Ceq = 0.45-0.55
% Cr = 2-5
% V = 1-3.5
% Ni = 4.3-6
% Si = 0.05-1.0
% Mn = 0.08-2
% Al = 0.5-2
% Mo = 0-3
% W = 0-2, and % Cu = 0-4.
16 . The steel according to claim 1 , wherein:
% Ceq = 0.25-0.43
% V = 1-4
% Cr-2-5
% Ni = 4.3-6
% Si = 0.05-1.0
% Mn = 0.08-2
% Al = 0.5-2
% Mo = 0-3
% W = 0-2
% Cu = 0-4, and
% Ti + % Zr + % Hf = 0.1-4.
17 . The steel according to claim 1 , wherein:
% Ceq - 0.45-0.6
% Cr - 2-8
% V = 1-3.5
% Si = 0.01-1.0
% Mn = 0.2-3
% Al = 1.5-4
% Mo = 1-3
% W = 0.5-2
% Ti = 0.2-2
% Cu = 0-2
% Co = 1-6
Ni = 6-12, and
% Hf + % Zr + % Ta + % Nb = 0-1.
18 . The steel according to claim 1 , wherein:
% Ceq = 0.25-0.43
% V = 1-4
% Cr = 2-8
% Si = 0.01-1.0
% Mn = 0.2-3
% Al = 1.5-4
% Mo = 1-3
% W = 0.5-2
% Ti = 0.2-2
% Co = 1-6
% Cu = 0-2
% Ni = 6-12, and
% Ti + % Zr + % Hf = 0.1-4.
19 . The steel according to claim 1 , wherein:
% Ceq = 0.25-0.43
% V = 0.85-4
% Cr = 0.1-4
% Ni = 5-12
% Si = 0.01-1
% Mn = 0.08-3
% Al = 1.5-5
% Mo = 1-5
% W = 0-2
% Ti = 0.5-3
% Cu = 0-2
% Co = 1.5-3.2, and
% Ti + % Zr + % Hf = 0.1-4.
20 . The steel according to claim 1 , wherein % Ceq=% C, with no intentional B or N added.
21 . The steel according to claim 1 , wherein the hardness level is at least 58 HRc.
22 . A die, tool or part comprising at least one steel according to claim 1 .
23 . An at least partly martensitic cold work tool steel having the following composition, all percentages being in weight percent:
% Ceq = 1.25-2.5
% C = 0.25-2.5
% N = 0-2%
B = 0-2
% Cr = 2-8
% Ni = 5-8
% Si = 0.05-1.0
% Mn = 0.08-3
% Al = 1.5-3
% Mo = 2-4
% W = 1-15
% Ti = 0.3-3
% Ta = 0-2
% Zr = 0-2
% Hf = 0-2,
% V = 3-6
% Nb = 0-2
% Cu = 0-4
% Co = 0-7,
% S = 0-1%
Se = 0-1
% Te = 0-1
% Bi = 0-1
% As = 0-1
% Sb = 0-1
% Ca - 0-1,
the rest consisting of iron and unavoidable impurities, wherein
% Ceq=% C+0.86*% N+1.2*% B,
% Cr+% V+% Mo+% W>3
% Al+% Mo+% Ti>1.5, and
% Hf+% Zr+% Ta+% Nb=0-2.
with the proviso that
when % Ceq=0.45-2.5, then % V=0.6-12; or
when % Ceq=0.25-0.45, then % V=0.85-4; or
when % Ceq=0.25-0.45, then % Ti+% Hf+% Zr+% Ta=0.1-4.
24 . An at least partly martensitic cold work tool steel having the following composition, all percentages being in weight percent:
% Ceq = 0.45-2.5
% C = 0.25-2.5
% N = 0-2%
B = 0-2
% Cr = 0.1-4
% Ni = 5-12
% Si = 0.01-1
% Mn = 0.08-3
% Al = 1.5-5
% Mo = 1-5
% W = 0-2
% Ti = 0.5-3
% Ta = 0-2
% Zr = 0-2
% Hf = 0-2,
% V = 0.6-2
% Nb = 0-2
% Cu = 0-2
% Co = 1.5-3.2,
% S = 0-1%
Se = 0-1
% Te = 0-1
% Bi = 0-1
% As = 0-1
% Sb = 0-1
% Ca = 0-1,
the rest consisting of iron and unavoidable impurities, wherein
% Ceq=% C+0.86*% N+1.2*% B,
% Cr+% V+% Mo+% W>3
% Al+% Mo+% Ti>1.5,
% Hf+% Zr+% Ta+% Nb=0-2 and
% Ti+% Hf+% Zr+% Ta+% Nb>0.7.
with the proviso that
when % Ceq=0.45-2.5, then % V=0.6-12; or
when % Ceq=0.25-0.45, then % V=0.85-4; or
when % Ceq=0.25-0.45, then % Ti+% Hf+% Zr+% Ta=0.1-4.
25 . An at least partly martensitic cold work tool steel as claimed in claim 1 , wherein the nickel based intermetallic compounds are compounds of nickel and a metal selected from the group consisting of aluminum, molybdenum titanium and mixtures thereof.
26 . An at least partly martensitic cold work tool steel as claimed in claim 1 , wherein the nickel based intermetallic compounds are selected from the group consisting of Ni 3 Ti, Ni 3 Mo, Ni 3 Al, NiTi, NiMo, and NiAl.Join the waitlist — get patent alerts
Track US2016138145A1 — get alerts on status changes and closely related new filings.
We store only your email — no account needed. See our privacy policy.