High-strength steel plate for high heat input welding excellent in brittle crack propagation stop characteristic and manufacturing method thereof
A technology of brittle crack propagation and large line energy welding, applied in the field of high-strength steel plates, can solve the problem of difficult control of production scale, and achieve the effect of excellent brittle crack propagation stop characteristics and improved safety.
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[0138] The molten steel (steel codes A to R) of each composition shown in Table 1 is smelted in a converter, and made into a steel raw material (slab thickness 250 mm) by continuous casting, hot rolled to a plate thickness of 50 to 80 mm, and then cooled. The test steels No. 1-30 were obtained. For some, tempering was also performed after cooling. Table 2 shows hot rolling conditions, cooling conditions, and tempering conditions.
[0139]
[0140] Table 2
[0141]
[0142] Note 1: The underline indicates that it is outside the scope of the present invention.
[0143] Note 2: "Cumulative reduction rate in the recrystallization γ zone" refers to the cumulative reduction rate in the central part of the plate thickness in the state of the austenite recrystallization temperature range.
[0144] Note 3: "Average reduction ratio in the recrystallization γ region" refers to the average reduction ratio per pass in the state where the central part of the plate thickness is in t...
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