High-strength hot-rolled steel sheet excellent in shape fixability and method of producing the same
A hot-rolled sheet steel, fixation technology, applied in the direction of manufacturing tools, metal rolling, heat treatment furnaces, etc., can solve the problem of unspecified X-ray intensity ratio and so on
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example 1
[0292] This is an example relating to a high-strength hot-rolled thin steel sheet having good shape fixability, the microstructure of which has ferrite or bainite as the phase with the largest volume fraction.
[0293] The steel materials A-K listed in Table 1 were heated to 1100-1270° C. and hot rolled under the hot rolling conditions listed in Table 2 so as to obtain thin steel sheets with a thickness of 2.5 mm. In Table 3 to Table 4, the evaluation results of various types of hot-rolled steel sheets are shown.
[0294] steel type
C
Si
mn
P
S
Al
Ti
Nb
V
Mo
Cr
A
0.03
0.06
0.30
0.009
0.004
0.042
B
0.04
0.32
0.54
0.012
0.005
0.045
0.13
C
0.06
0.83
1.32
0.010
0.006
0.036
0.11
0.033
D
0.05
0.02
0.78
0.0...
example 2
[0318] This is an example relating to a high-strength hot-rolled steel sheet with good shape fixability having a multi-phase structure in which ferrite or bainite is the phase with the largest volume fraction and includes volume fraction 1-25% martensite.
[0319] Steel materials A-L having chemical compositions shown in Table 5 were heated to 1100-1270° C. and hot rolled under the hot rolling conditions shown in Table 6 to obtain hot-rolled steel sheets with a thickness of 2.5 mm. Various types of measurement and evaluation results are shown in Table 6 and Table 7 (continued from Table 6).
[0320] Shape fixability was evaluated using strip specimens of 270 mm length x 50 mm width x plate thickness obtained by punch width of 78 mm, punch shoulder of R5 mm, die shoulder of R5 mm, and various wrinkle suppression pressures. A hat shape was formed, and then the amount of warpage of the wall portion was measured as the radius of curvature ρ (mm), and the reciprocal 1000 / ρ w...
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