High-strength steel plate and process for production thereof, and high-strength steel pipe
A high-strength, thick steel plate technology, applied in the field of high-strength steel pipes, can solve the problems of reduced toughness, poor DWTT characteristics, difficult crack propagation stop characteristics, etc., to achieve excellent energy absorption, good shear crack resistance, and excellent DWTT characteristics Effect
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[0133] Using the steels with the chemical compositions shown in Table 1, steel plates A to K were prepared under the conditions of hot rolling, accelerated cooling, and reheating shown in Table 2. Among them, reheating is performed by an induction heating type heating device installed on the same production line as the accelerated cooling equipment.
[0134]Table 1 (mass%)
[0135] steel type
C
Si
mn
Al
Nb
Ti
N
Cu
Ni
Cr
Mo
V
Ca
S
O
REM
Zr
Mg
Formula 1)
Ar 3
A
0.035
0.10
2.10
0.030
0.031
0.012
0.004
0.40
0.40
0.05
0.22
0.041
0.0018
0.0005
0.002
-
-
-
2.1
683
B
0.042
0.10
2.04
0.030
0.030
0.012
0.004
0.40
0.70
0.20
0.40
0.045
0.0016
0.0004
0.002
...
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