Cold rolled steel sheet for drawn can and method for manufacturing same
AssigneeNippon Steel Corporation
InventorsMasaharu OKA, Nobusato KOJIMA, Yuta DAIROKUNO, Michihiro NONO
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Abstract
A steel sheet for a drawn can has a predetermined chemical composition and has a ferrite single-phase structure with a crystal grain size number of 11.0 or more, the sheet thickness is 0.15 to 0.50 mm, in an L direction of the steel sheet after an ageing treatment at 100° C. for one hour, an yield strength YP is 220 to 290 MPa, a tensile strength TS is 330 to 390 MPa, a total elongation EL is 32% or more, an yield point elongation YP-EL is 0%, an average plastic strain ratio rm is more than 1.35, and an in-plane anisotropy Δr is −0.30 to +0.15.
Claims12
A cold rolled steel sheet for a drawn can comprising, as a chemical composition, by mass %:
- C:
- 0.0060% to 0.0110%;
- Si:
- 0.50% or less;
- Mn:
- 0.70% or less;
- P:
- 0.070% or less;
- S:
- 0.050% or less;
- Sol. Al:
- 0.005% to 0.100%;
- N:
- less than 0.0025%;
- Nb satisfying Expression (1);
- B:
- 0% to 0.0030%;
- and
- Ti:
- 0% to 0.035%
- with a remainder of Fe and an impurity,
- wherein the steel sheet for a drawn can include a ferrite single-phase structure with a crystal grain size number of 11.0 or more,
- a sheet thickness is 0.15 to 0.50 mm,
- in an L direction of the steel sheet after an ageing treatment at 100° C. for one hour,
- a yield strength YP is 220 to 290 MPa,
- a tensile strength TS is 330 to 390 MPa,
- a total elongation EL is 32% or more,
- a yield point elongation YP-EL is 0%, and
- in the steel sheet after the ageing treatment at 100° C. for one hour,
- an average plastic strain ratio rm is more than 1.35, and
- an in-plane anisotropy Δr is −0.30 to +0.15,
- 500×C≤Nb/C≤8.0 (1)
- here, to element symbols in Expression (1), the amounts (% by mass) of the corresponding elements are assigned.
Dependencies are inferred from the claim text.