US2025051890A1PendingUtilityA1
Heavy plate and thermomechanical treatment method for a starting material for the production of the heavy plate
Assignee: VOESTALPINE GROBBLECH GMBHPriority: Dec 29, 2021Filed: Dec 29, 2022Published: Feb 13, 2025
Est. expiryDec 29, 2041(~15.4 yrs left)· nominal 20-yr term from priority
C21D 8/02C22C 38/06C22C 38/02C21D 9/46C21D 9/08C21D 8/0263C21D 8/0226C21D 1/02C21D 8/0242C22C 38/04C21D 8/0205
42
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Claims
Abstract
A heavy plate and thermomechanical treatment method are disclosed for a starting material, more particularly a slab ingot, for the production of a heavy plate consisting of a steel alloy. In order to be able to achieve advantageous mechanical characteristics in the heavy plate, it is proposed for a multi-stage cooling with optionally at least one straightening procedure to take place after the final forming in that a cooling from a second final rolling temperature, more particularly ≥Ar3, of the second rolling procedure to a first temperature between Ar3 and Ar1 is carried out at a first cooling rate in a first stage after the second rolling procedure and a cooling from the first temperature to a second temperature <Ar1 is carried out at a second cooling rate in a subsequent second stage, where the first cooling rate is < the second cooling rate.
Claims
exact text as granted — not AI-modified1 . A thermomechanical treatment method for a starting material for the production of a heavy plate consisting of a steel alloy, containing the following, each in wt %:
0.01 to 0.20 carbon (C), 0.5 to 2.50 manganese (Mn), 0.05 to 0.80 silicon (Si), 0.01 to 0.20 aluminum (Al), <0.05 phosphorus (P), <0.01 sulfur (S),
and optionally individual elements from the following group or combinations thereof:
0 to 1.5 chromium (Cr)
0 to 1.0 molybdenum (Mo)
0 to 1.0 copper (Cu)
0 to 5.0 nickel (Ni)
0 to 0.30 vanadium (V)
0 to 0.20 titanium (Ti)
0 to 0.20 niobium (Nb)
0 to 0.005 boron (B)
0 to 0.015 nitrogen (N)
0 to 0.01 calcium (Ca)
and residual iron (Fe) and inevitable production-related impurities, which treatment method comprises the following steps:
heating the starting material to above the Ac3 temperature and partial forming the starting material using a first rolling procedure,
accelerated cooling of the starting material after the first rolling procedure from a first final rolling temperature to below the Ar3 temperature,
heating the starting material after the accelerated cooling to a second initial rolling temperature for a second rolling procedure above the Ac3 temperature and final forming of the starting material by the second rolling procedure to a thickness of the heavy plate and
multi-stage cooling optionally with at least one straightening procedure after the final forming in that
a cooling from a second final rolling temperature of the second rolling procedure to a first temperature between Ar3 and Ar1 is carried out at a first cooling rate in a first stage after the second rolling procedure and
a cooling from the first temperature to a second temperature <Ar1 is carried out at a second cooling rate in a subsequent second stage, where the first cooling rate is < the second cooling rate.
2 . The thermomechanical treatment method according to claim 1 , wherein the second cooling rate in degrees Celsius is
≥
C
1
min
+
(
C
2
min
Thickness
Nmin
)
*
e
(
-
C
3
min
*
Thickness
)
wherein
C1min=0.5
C2min=69.7
C3min=0.02148
Nmin=0.3
and
Thickness=thickness of the heavy plate in millimeters.
3 . The thermomechanical treatment method according to claim 1 , wherein the second cooling rate in degrees Celsius is
≤
C
1
max
+
(
C
2
max
Thickness
Nmax
)
*
e
(
-
C
3
max
*
Thickness
)
wherein
C1max=1.5
C2max=12294.5
C3Max=0.02264
Nmax=1.43
and
Thickness=thickness of the heavy plate in millimeters.
4 . The thermomechanical treatment method according to claim 1 , wherein a ratio of the second cooling rate to the first cooling rate is at least 2:1.
5 . The thermomechanical treatment method according to claim 1 , wherein the first cooling rate is ≤5° C./s.
6 . The thermomechanical treatment method according to claim 1 , wherein the first temperature in degrees Celsius is
≥
Ar
1
+
0.1
*
(
Ar
3
-
Ar
1
)
2
7 . The thermomechanical treatment method according to claim 1 , wherein the second temperature is in a range from 450° C. to 100° C.
8 . The thermomechanical treatment method according to claim 1 , wherein cooling the starting material from the second temperature to room temperature is carried out at a third cooling rate in a third stage and the third cooling rate is < the second cooling rate.
9 . The thermomechanical treatment method according to claim 8 , wherein the third cooling rate is s 5° C./s.
10 . The thermomechanical treatment method according to claim 1 , wherein the heating to the second initial rolling temperature for the second rolling procedure is carried out at a heating rate of at least 12° C./min.
11 . The thermomechanical treatment method according to claim 1 , wherein the final forming is carried out to a thickness of the heavy plate in a range of 8 to 150 mm.
12 . The thermomechanical treatment method according to claim 1 , wherein the steel alloy contains the following, each in wt %:
0.02 to 0.1 carbon (C), 1.0 to 2.0 manganese (Mn), 0.1 to 0.80 silicon (Si), 0.010 to 0.15 aluminum (Al), <0.050 phosphorus (P), and <0.010 sulfur (S).
13 . The thermomechanical treatment method according to claim 1 , wherein the steel alloy optionally contains at least one element from the following group or combinations thereof, each in wt %:
0 to 0.75 copper (Cu) 0 to 3.0 nickel (Ni) 0 to 0.20 vanadium (V) 0 to 0.003 boron (B).
14 . A heavy plate produced by using the thermomechanical treatment method according to claim 1 , wherein the heavy plate has a yield strength ratio (R p0.2 /R m ) of <0.7.
15 . The heavy plate according to claim 14 , wherein the heavy plate has a thickness in a range from 8 to 150 mm.
16 . The heavy plate according to claim 14 , wherein the heavy plate has a yield strength R p0.2 >550 N/mm 2 .
17 . A method of using the heavy plate according to claim 14 , comprising using the heavy plate in a longitudinally welded pipe for a natural gas pipeline or in a construction material.Join the waitlist — get patent alerts
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