High-strength steel pipe excellent in deformability and low-temperature toughness, high-strength steel sheet, and manufacturing method of said steel sheet
A technology of high-strength steel plate and low-temperature toughness, which is applied in the manufacture of the aforementioned steel plate and the field of high-strength steel plate, can solve problems such as the reduction of low-temperature toughness, and achieve the effect of reducing the burden
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Embodiment 1
[0263] Steel having the composition shown in Table 1 was melted, and a steel slab having a thickness of 240 to 300 mm was produced by continuous casting according to a conventional method. Table 2 shows the slab thickness at this time.
[0264] Next, these steel slabs were heated to the reheating temperature shown in Table 2, and then hot-rolled and cooled under the conditions shown in Table 2 to manufacture steel sheets having the final thicknesses shown in Table 2. In addition, the rolling conditions of the non-recrystallized γ region rolling which is the final process of the hot rolling of this Example are shown in Table 2.
[0265] In addition, in this example, the hot-rolled steel sheet was slowly cooled to the starting temperature of accelerated cooling shown in Table 2 (the average cooling rate was less than 10° C. / s), and thereafter, the accelerated cooling method shown in Table 2 was used. Conditions were cooled by water cooling. In addition, the Ar of each steel 3...
Embodiment 2
[0284] The oxygen concentration at the time of Ti addition was adjusted to be in the range of 0.001 to 0.003%, and the steel having the composition shown in Tables 4 and 5 was melted in a steelmaking process, and then cast to produce a slab. The smelting and casting of steel can be performed according to a conventional method, and continuous casting can be performed from the viewpoint of productivity. In this example, it was performed by continuous casting.
[0285] Next, for hot rolling, the obtained slab is reheated to 950° C. or higher, hot rolled at 700° C. or higher, and then water-cooled at an average cooling rate of 10° C. / s or higher to produce a steel sheet. In addition, in the hot rolling of this Example, the reduction ratio of the rolling in the recrystallization region was made into 0-3, and the reduction ratio of the rolling in the non-recrystallization region was made into the range of 2-9.
[0286] In addition, in the component composition shown in Table 4 and ...
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