US2003145911A1PendingUtilityA1
Highly stable, steel and steel strips or steel sheets cold-formed, method for the production of steel strips and uses of said steel
Priority: Jun 13, 2001Filed: Jun 13, 2002Published: Aug 7, 2003
Est. expiryJun 13, 2021(expired)· nominal 20-yr term from priority
C21D 8/02C22C 38/04C22C 38/06C21D 8/0273C22C 38/002C22C 38/02C21D 8/0236C21D 8/0226
33
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Claims
Abstract
A steel strip or sheet steel having good cold formability and high-strength is described, comprising a light steel having (in weight-percent) C: ≦1.00%, Mn: 7.00-30.00%, Al: 1.00-10.00%, Si: >2.50-8.00%, Al+Si: >3.50-12.00%, B: >0.00-<0.01%, as well as alternately Ni: <8.00%, Cu: <3.00%, N: <0.60%, Nb: <0.30%, Ti: <0.30%, V: <0.30%, P: <0.01%, with the remainder iron and unavoidable impurities.
Claims
exact text as granted — not AI-modified1 . A light steel, having good cold formability and high strength, with the following composition (in weight-percent):
C:
23 1.00%
Mn:
7.00-30.00%
Al:
1.00-10.00%
Si:
>2.50-8.00%
Al + Si:
>3.50-12.00%
B:
>0.00-<0.01%
as well as alternately
Ni:
<8.00%
Cu:
<3.00%
N:
<0.60%
Nb:
<0.30%
Ti:
<0.30%
V:
<0.30%
P:
<0.01%,
with the remainder iron and unavoid-
able impurities.
2 . The light steel according to claim 1 , characterized in that the carbon content is 0.10-1.00 weight-percent.
3 . The light steel according to one of the preceding claims, characterized in that the Si content is >2.70 weight-percent.
4 . The light steel according to one of the preceding claims, characterized in that the boron content is 0.002 weight-percent to 0.01 weight-percent, in particular 0.003 to 0.008 weight-percent.
5 . A steel strip or sheet steel produced from a steel having a composition according to one of claims 1 to 4 .
6 . The steel strip or sheet steel according to claim 5 , characterized in that its tensile strength is at least 680 MPa.
7 . The steel strip or sheet steel according to claim 5 or 6 , characterized in that the product of its tensile strength and its elongation is at least 41,000 MPa.
8 . The steel strip or sheet steel according to one of claims 4 to 7 , characterized in that its yield point is up to 520 MPa.
9 . A method for producing a cold formable, high-strength steel strip or sheet steel, wherein
an input stock, such as slabs, thin slabs, or strip, is cast from a steel having a composition according to one of claims 1 to 4 , the cast input stock is heated to =1100° C. or used directly at such a temperature, the preheated input stock is hot rolled to hot strip at a hot rolling final temperature of at least 800° C., and the finish-rolled hot strip is coiled at a coiler temperature of 450° C. to 700° C.
10 . The method according to claim 9 ,characterized in that the hot strip is cold rolled to cold strip after the coiling.
11 . The method according to claim 10 , characterized in that the cold strip is subjected to annealing at an annealing temperature of 600° C. to 1100° C.
12 . The method according to claim 11 , characterized in that the annealing is performed as hood annealing at an annealing temperature from 600° C. to 750° C.
13 . The method according to claim 11 , characterized in that the annealing is performed as continuous annealing at an annealing temperature of 750° C. to 1100° C.
14 . The method according to one of claims 10 to 13 , characterized in that the cold strip is dressed.
15 . The method according to one of claims 9 to 14 , characterized in that the cold rolling is performed at a cold rolling reduction of 30% to 75%.
16 . The method according to one of claims 9 to 15 , characterized in that blanks, which are subsequently cold formed into finished components, are produced from the respective hot or cold strip obtained.
17 . The method according to claim 16 , characterized in that the cold forming is performed as flow forming.
18 . A use of a steel or a steel strip or sheet steel according to one of claims 1 to 8 for producing supporting vehicle body components.
19 . A use of a steel or a steel strip or sheet steel according to one of claims 1 to 8 for producing externally visible parts of vehicle bodies.
20 . A use of a steel or a steel strip or sheet steel according to one of claims 1 to 8 for producing wheels for vehicles, in particular motor vehicles.
21 . A use of a steel or a steel strip or sheet steel according to one of claims 1 to 8 for producing non-magnetic components.
22 . A use of a steel or a steel strip or sheet steel according to one of claims 1 to 8 for producing components used in cryoengineering.
23 . A use of a steel or a steel strip or sheet steel according to one of claims 1 to 8 for producing internally or externally hydroformed components.
24 . A use of a steel or a steel strip or sheet steel according to one of claims 1 to 7 for producing tubes, which are particularly intended for the production of high-strength engine parts, such as camshafts or piston rods.
25 . A use of a steel or a steel strip or sheet steel according to one of claims 1 to 8 for producing components, such as armor plates, intended for protection against pulsed stresses, such as bombardment.
26 . A use of a steel or a steel strip or sheet steel according to one of claims 1 to 8 for producing protection components, such as helmets and body armor, intended for protection of persons against pulsed stresses, such as bombardment.
27 . A use of a steel or a steel strip or sheet steel according to one of claims 1 to 8 for producing components through flow forming.
28 . A use of a steel or a steel strip or sheet steel according to one of claims 1 to 8 for producing gear parts.
29 . The use according to claim 28 , characterized in that the gear parts are provided with teeth.
30 . The use according to claim 28 or 29 , characterized in that the gear parts are produced through flow forming.Join the waitlist — get patent alerts
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