Back to results
US 2025/0059616 A1Published application
Double oriented electrical steel sheet and method for manufacturing same
AssigneePosco
InventorsHyunwoo Mun, Se Il Lee, Su-Yong Shin, Yunsu Kim
Life of this patent
Estimating the term…
Abstract
A double oriented electrical steel sheet according to an exemplary embodiment of the present disclosure contains, in wt %, at least 2.0% of Si, more than 0% and 0.02% or less of AI, 0.02-0.50% of Mn, more than 0% and 0.004% or less of C, and 0.0005-0.005% of S, with the remainder comprising Fe and inevitable impurities, wherein the area percentage of grains having a grain size of 2000 μm or less is 25% or less.
Claims12
A double oriented electrical steel sheet, comprising:
- in wt %, 2.0% or more of Si, 0.02% or less (excluding 0%) of Al, 0.02 to 0.50% of Mn, 0.004% or less (excluding 0%) of C, and 0.0005 to 0.005% of S, with the remainder comprising Fe and inevitable impurities, wherein an area percentage of grains having a grain size of 2000 μm or less is 25% or less.
A method of manufacturing a double oriented electrical steel sheet, comprising:
- hot-rolling a slab containing, in wt %, 2.0% or more of Si, 0.02% or less (excluding 0%) of Al, 0.02 to 0.50% of Mn, 0.004% or less (excluding 0%) of C, and 0.0005 to 0.005% of S, with the remainder comprising Fe and inevitable impurities, to manufacture a hot-rolled sheet;
- manufacturing a primary cold-rolled sheet by primary cold-rolling the hot-rolled sheet;
- intermediate-annealing the primary cold-rolled sheet;
- manufacturing a secondary cold-rolled sheet by secondarily cold-rolling the intermediate annealed sheet;
- and annealing the secondary cold-rolled sheet,
- wherein, in the manufacturing of the secondary cold-rolled sheet, a reduction ratio is 55 to 85%,
- further comprising, before the annealing of the secondary cold-rolled sheet, increasing the temperature at a temperature increase rate of 100° C./h or higher in a temperature range of 100 to 1000° C.
4 more elements
Dependencies are inferred from the claim text.