High strength steel sheet
A high-strength steel plate, tensile strength technology, used in furnaces, heat treatment equipment, manufacturing tools, etc., to achieve the effect of improving ductility and bending workability
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Embodiment
[0181] In this example, each of the obtained products was subjected to a Vickers hardness test, a nanohardness test, a tensile test, a V bending test, and a bending load test.
[0182] The average Vickers hardness is determined as follows. First, from the 1 / 2 position of the plate thickness toward the surface, the Vickers hardness at a position in the plate thickness direction is measured at intervals of 5% of the plate thickness in the plate thickness direction with a press-fit load of 100 g, and then from this position on the plate On a line perpendicular to the thickness direction and parallel to the rolling direction, the Vickers hardness was measured at a total of 5 points with an indentation load of 100 g, and their average value was set as the average Vickers hardness at positions in the thickness direction. In addition, the interval of each measurement point lined up in the plate thickness direction and the rolling direction was set to the distance of 4 times or more o...
Embodiment A
[0189] For a continuously cast slab (base steel plate) having a thickness of 20 mm having the chemical composition shown in Table 1, the surface is ground to remove surface oxides, and one or both sides thereof are laminated by arc welding. The steel sheets for the surface layers of the chemical compositions shown in Table 1 were used. The ratio of the thickness of the steel plate for the surface layer to the plate thickness is as shown in Table 1 "Ratio (%) of the steel plate for the surface layer (one side)". This was hot-rolled under the conditions of heating temperature, finishing temperature, and coiling temperature shown in Table 2 to obtain laminated hot-rolled steel sheets. In the case of making hot-rolled steel sheets into product test materials, the holding time at 700° C. to 500° C. in hot rolling was intentionally controlled to the values shown in Table 2. When the cold-rolled steel sheet was made into a product, pickling and 50% cold rolling were performed ther...
Embodiment B
[0201] [Example B: Formation of hardness transition zone]
[0202] For a continuously cast slab (base steel plate) having a thickness of 20 mm having the chemical composition shown in Table 3, the surface is ground to remove surface oxides, and one or both sides thereof are laminated by arc welding. The steel sheets for the surface layers of the chemical compositions shown in Table 1 were used. The ratio of the thickness of the steel sheet for the surface layer to the sheet thickness is as shown in Table 3 "Ratio (%) of the steel sheet for the surface layer (one side)". This was hot-rolled under the conditions of heating temperature, heating time, finishing temperature, and coiling temperature shown in Table 4 to obtain laminated hot-rolled steel sheets. In the case of making hot-rolled steel sheets into product test materials, the average cooling rate at 750° C. to 550° C. during hot rolling was intentionally controlled to the values shown in Table 4. When the cold-rolled...
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