Thick-walled high-toughness high-strength steel plate and manufacturing method thereof
A high-strength steel plate and manufacturing method technology, applied in the direction of manufacturing tools, metal rolling, furnaces, etc., can solve the problems that it is difficult to ensure the internal strength and toughness of the steel plate with surface toughness at the same time
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[0123] Steels No.1 to 30 shown in Table 1 were melted and cast under the conditions shown in Table 2 to produce steel raw materials, and then hot forged (except for sample numbers 5, 6, and 41) or blooming ( Sample Nos. 5, 6, 41), and then hot rolled into steel plates with the thicknesses shown in Table 2, and then water quenched and tempered to manufacture steel plates of Sample Nos. 1 to 38 and supply them to the following the test described. In this example, in the case of reheating and quenching, the reheating temperature becomes the quenching temperature.
[0124] In addition, the δ ratio is obtained by using C obtained from the formula (3) for each base material component L The value of the value and the value of the C content of the base material and the value calculated by the formula (2).
[0125] In addition, the cooling rate at the time of solidification at the time of steel raw material manufacture is the value calculated by heat transfer calculation based on the...
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