Hot rolled steel sheet for non oriented electrical steel sheet and producing method thereof
AssigneeNippon Steel Corporation
InventorYoshihiro Arita
Life of this patent
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Abstract
A hot rolled steel sheet is for a non oriented electrical steel sheet, wherein an amount of solid-soluted Ti is 0.0005% or less, Ti carbides with an equivalent circle diameter of 10 to 50 nm exist in a grain and at a grain boundary of a ferrite grain, 10 to 100 number % of the Ti carbides which exist in the grain are compositely precipitated with a Mn sulfide, and a number density of the Ti carbides which exist at the grain boundary is 0.1 pieces/μm or less.
Claims6
A hot rolled steel sheet for a non oriented electrical steel sheet, the hot rolled steel sheet comprising, as a chemical composition, by mass %,
- 0.0010 to 0.0050% of C,
- 0.1 to less than 0.5% of Si,
- 0.1 to 0.5% of Mn,
- 0.1 to 0.5% of Al,
- 0.0010 to 0.0030% of total-Ti,
- 0.0010 to 0.0030% of N,
- more than 0.0015 to 0.0040% of S,
- 0 to 0.0030% of Nb,
- 0 to 0.0030% of V,
- 0 to 0.0030% of Zr,
- 0 to 0.100% of Sn, and
- a balance consisting of Fe and impurities, wherein
- an amount of solid-soluted Ti is 0.0005% or less,
- at an observed surface which is parallel to a rolling direction and a transverse direction,
- Ti carbides with an equivalent circle diameter of 10 to 50 nm exist in a grain and at a grain boundary of a ferrite grain,
- 10 to 100 number % of the Ti carbides which exist in the grain are compositely precipitated with a Mn sulfide, and
- a number density of the Ti carbides which exist at the grain boundary is 0.1 pieces/μm or less.
A hot rolled steel sheet for a non oriented electrical steel sheet, the hot rolled steel sheet comprising, as a chemical composition, by mass %,
- 0.0010 to 0.0050% of C,
- 0.1 to less than 0.5% of Si,
- 0.1 to 0.5% of Mn,
- 0.1 to 0.5% of Al,
- 0.0010 to 0.0030% of total-Ti,
- 0.0010 to 0.0030% of N,
- more than 0.0015 to 0.0040% of S,
- 0 to 0.0030% of Nb,
- 0 to 0.0030% of V,
- 0 to 0.0030% of Zr,
- 0 to 0.100% of Sn, and
- a balance being Fe and impurities, wherein
- an amount of solid-soluted Ti is 0.0005% or less,
- at an observed surface which is parallel to a rolling direction and a transverse direction,
- Ti carbides with an equivalent circle diameter of 10 to 50 nm exist in a grain and at a grain boundary of a ferrite grain,
- 10 to 100 number % of the Ti carbides which exist in the grain are compositely precipitated with a Mn sulfide, and
- a number density of the Ti carbides which exist at the grain boundary is 0.1 pieces/μm or less.
Dependencies are inferred from the claim text.