High strength hot rolled steel sheet and manufacturing method for same
A technology for hot-rolled steel sheets and a manufacturing method, which can be applied to manufacturing tools, heat treatment furnaces, heat treatment equipment, etc., and can solve problems such as reduction in punching properties and hole expandability.
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[0142] Molten steel having the composition shown in Table 1 was melted in a converter, and a slab (steel raw material) was produced by a continuous casting method. During continuous casting, electromagnetic stirring (EMS) was performed for reducing segregation of components in hot-rolled steel sheets other than hot-rolled steel sheet Nos. 22 and 23 (steel K) in Tables 2 and 3 described later. Next, these steel raw materials were heated under the conditions shown in Table 2, and hot rolling including rough rolling and finish rolling under the conditions shown in Table 2 was performed. After finish rolling, the cooling start time (time from finish rolling to start cooling (forced cooling)) and average cooling rate (average cooling rate from finish rolling end temperature to coiling temperature) under the conditions shown in Table 2 ) cooling, and coiled at the coiling temperature of the conditions shown in Table 2 to make hot-rolled steel sheets with the thickness shown in Table...
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