Soft high-silicon steel sheet and manufacturing method thereof
AssigneePosco
InventorsDong-Kyun KIM, Byung-Deug HONG, Seok-Hwan CHOI
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Abstract
The present invention relates to a soft high-silicon steel sheet, and more particularly, to a soft high-silicon steel sheet which has ductility even if the silicon content thereof is greater than 4%, and can thus be manufactured into a steel sheet having a high silicon content only by means of rolling without an additional siliconizing process. The soft high-silicon steel sheet may include a silicon content greater than 4 wt % and less than or equal to 7 wt % and 1 to 20% of chromium, or may include 5 to 7 wt % of Si+Al and 1 to 20 wt % of chromium.
Claims13
A method of manufacturing a soft high-silicon steel sheet, the method comprising:
- preparing a steel material comprising, by wt %, silicon (Si):
- greater than 4% to 7% and chromium (Cr):
- 1% to 20%;
- forming a hot rolled steel sheet by hot rolling the steel material at a temperature of 800° C. or higher;
- and
- cold rolling the hot rolled steel sheet within a temperature range of 150° C. to 300° C., and
- wherein the forming of the hot rolled steel sheet comprises cooling the hot rolled steel sheet from 800° C. to 100° C. at a cooling rate of 30° C./sec or higher after the hot rolling of the steel material.
Dependencies are inferred from the claim text.