Steel wire excellent in descalability in mechanical descaling and method for production thereof
A steel wire rod and mechanical technology, applied in the field of steel wire rod and steel wire rod that needs descaling, can solve the problems of cooling condition research and inability to achieve results, etc.
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Embodiment A
[0062] Carbon steels whose C contents and Si contents are shown in Table 1, respectively, were produced in a converter. Each ingot obtained is crushed and rolled into billets (155mm 2 ). The billet is heated to about 1150°C and then hot rolled. Hot rolling was performed at a temperature of 1030° C., and the obtained wire rods had various diameters D (mm) shown in Table 1. After completion of the hot rolling, each obtained wire rod was cooled to a coiling initiation temperature of 840° C. at a first cooling rate of 40° C. / s. Coiling is then started and cooled to 700°C at various second cooling rates. Cooling is then performed between 700°C and 500°C at a third cooling rate of 2.5°C / s.
[0063] The average concentration of Si in the scale interface portion deposited on each of the obtained wire rods was measured. The above measurement was carried out in the following manner. That is, the base metal part of the wire rod is dissolved with a dissolving solution, and the scale...
Embodiment B
[0073]As in Example A, steels having various C contents and Si contents were subjected to hot rolling to produce each wire rod having a scale layer formed on the base metal portion. Table 2 shows the finish of hot rolling and the cooling conditions after hot rolling.
[0074] As in Example A, the Si average concentration, Si average concentration index, and remaining scale ratio in the scale interface portion of each of the obtained wire rods were measured. In addition, the area ratio of the measuring point in which (Si concentration at the measuring point of the linear analysis) / (Si content of the base metal part) is not less than 2.0 times the Si content in the steel of the base metal part was measured, as the area of the Si concentrated region in Area ratio (%) in the scale interface portion. These results are shown in Table 2 together.
[0075] Table 2
[0076]
[0077] figure ...
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