High-strength hot-rolled steel sheet having superior punchability and method for producing same
一种热轧钢板、制造方法的技术,应用在制造工具、金属轧制、化学仪器和方法等方向,达到有助于轻量化、冲裁加工性提高的效果
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[0083] Molten steel having the composition shown in Table 1 was melted in a converter, and a billet (steel raw material) was produced by continuous casting. These slabs were heated under the conditions shown in Table 2, and subjected to rough rolling and finish rolling under the conditions shown in Table 2. And after finishing rolling, it was cooled under the conditions shown in Table 2, and coiled at the coiling temperature shown in Table 2 to obtain a hot-rolled steel sheet with a thickness shown in Table 2. It should be noted that cooling was started within 2 seconds after finish rolling was completed. Here, the first-stage cooling is represented by an average cooling rate from the finish rolling finish temperature to the cooling stop rate. In addition, the second-stage cooling is represented by the average cooling rate from the cooling stop temperature of the first-stage cooling to the coiling temperature.
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