US2011182765A1PendingUtilityA1
Use of a steel alloy
Assignee: BENTELER AUTOMOBILTECHNIK GMBHPriority: Jan 4, 2010Filed: Dec 29, 2010Published: Jul 28, 2011
Est. expiryJan 4, 2030(~3.4 yrs left)· nominal 20-yr term from priority
C21D 8/02C21D 2211/001C22C 38/04C21D 9/46C22C 38/02C22C 38/14C21D 2211/008C21D 9/0068C21D 1/673
34
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Claims
Abstract
A steel grade for use in a hot forming and press hardening process has the following composition, in weight percent: C 0.15%=C<0.35%, Mn 0.8-2.5%, Si 1.5-2.5%, Cr max. 0.4%, Al max. 0.1%, Ni max. 0.3%, B 0.0008-0.005%, Ti 0.005-0.1%, Nb max. 0.1%, remainder iron and unavoidable impurities as well as a hot formed and press hardened structural part made of this steel grade.
Claims
exact text as granted — not AI-modified1 .- 8 . (canceled)
9 . A steel alloy for use in a hot forming and press hardening process, said steel alloy comprising in weight percent:
C
0.15% = C < 0.35%
Mn
0.8-2.5%
Si
1.5-2.5%
Cr
max. 0.4%
Al
max. 0.1%
Ni
max. 0.3%
B
0.0008-0.005%
Ti
0.005-0.1%
Nb
max. 0.1%,
remainder iron and unavoidable impurities.
10 . The steel alloy of claim 9 , comprising in weight percent:
C
0.22-0.25 %
Mn
1.5-1.7%
Si
1.95-2.1%
Cr
max. 0.15%
Al
0.03-0.05%
Ni
max. 0.2 %
B
0.002-0.0035%
P
max. 0.015%
S
max. 0.01%,
Ti
0.005-0.1%
Nb
max. 0.1%
N
max. 0.01%,
remainder iron and unavoidable impurities.
11 . The steel alloy of claim 9 , wherein a ratio of Ti to N is 1:3.4 to 5.
12 . The steel alloy of claim 9 , wherein the steel alloy has a microstructure comprised predominantly of martensite with proportions of residual austenite and bainite.
13 . A hot formed and press hardened structural part made from a steel grade comprising, in weight percent:
C
0.15% = C < 0.35%
Mn
0.8-2.5 %
Si
1.5-2.5 %
Cr
max. 0.4%
Al
max. 0.1%
Ni
max. 0.3%
B
0.0008-0.005%
Ti
0.005-0.1%
Nb
max. 0.1 %,
remainder iron and unavoidable impurities.
14 . The hot formed and press hardened structural part of claim 13 , wherein the steel grade is made of a composition, in weight percent of:
C
0.22-0.25%
Mn
1.5-1.7%
Si
1.95-2.1%
Cr
max. 0.15%
Al
0.03-0.05%
Ni
max. 0.2%
B
0.002-0.0035%
P
max. 0.015%
S
max. 0.01%,
Ti
0.005-0.1%
Nb
max. 0.1%
N
max. 0.01%,
remainder iron and unavoidable impurities
15 . The hot formed and press hardened structural part of claim 13 , wherein the steel grade has predominantly a martensitic microstructure with proportions of residual austenite and bainite.
16 . The hot formed and press hardened structural part of claim 13 , for use as a structural and/or safety component.
17 . A method of making a steel alloy, comprising the steps of:
heating a blank having a steel composition comprising in weight percent:
C
0.15% = C < 0.35%
Mn
0.8-2.5%
Si
1.5-2.5%
Cr
max. 0.4%
Al
max. 0.1%
Ni
max. 0.3%
B
0.0008-0.005%
Ti
0.005-0.1%
Nb
max. 0.1%,
remainder iron and unavoidable impurities, to a temperature above Ac 3 ;
placing the blank in a force-cooled mold;
hot forming and press hardening the blank; and
cooling the blank to a temperature below 200° C.
18 . The method of claim 17 , wherein the hot forming and press hardening step is carried out, while the mold is closed.
19 . The method of claim 17 , wherein the steel composition comprises, in weight percent:
C
0.22-0.25%
Mn
1.5-1.7%
Si
1.95-2.1%
Cr
max. 0.15%
Al
0.03-0.05%
Ni
max. 0.2%
B
0.002-0.0035%
P
max. 0.015%
S
max. 0.01%,
Ti
0.005-0.1%
Nb
max. 0.1%
N
max. 0.01%,
remainder iron and unavoidable impurities.Join the waitlist — get patent alerts
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