Steel foil and method for manufacturing the same
View Patent ↗A steel foil according to an aspect of the present invention includes, by mass %, C: 0.0001 to 0.02%; Si: 0.001 to 0.01%; Mn: 0.01 to 0.3%; P: 0.001 to 0.02%; S: 0.0001 to 0.01%; Al: 0.0005 to 0.1%; N: 0.0001 to 0.004%; and a balance consisting of Fe and impurities, wherein a thickness is 5 to 15 μm, and a tensile strength is more than 900 MPa and 1.200 MPa or less.
1. A steel foil consisting of, by mass %:
C: 0.0001 to 0.02%;
Si: 0.001 to 0.01%;
Mn: 0.01 to 0.3%;
P: 0.001 to 0.02%;
S: 0.0001 to 0.01%;
Al: 0.01 to 0.1%;
N: 0.0001 to 0.004%;
including one or both of, by mass %:
Ti: 0.01 to 0.1%; and
Nb: 0.005 to 0.1%; and
a balance consisting of Fe and impurities, wherein
a thickness is 5 μm or more and 15 μm or less, and a tensile strength is more than 900 MPa and 1,200 MPa or less, and
wherein a volume resistivity is less than 16 μΩcm.
2. The steel foil according to claim 1 ,
wherein a Ni plated layer or a Cr plated layer is included on an outermost layer of the steel foil.
3. A method for manufacturing a steel foil, the method comprising, foil-rolling a steel sheet consisting of, by mass %,
C: 0.0001 to 0.02%,
Si: 0.001 to 0.01%,
Mn: 0.01 to 0.3%,
P: 0.001 to 0.02%,
S: 0.0001 to 0.01%,
Al: 0.01 to 0.1%,
N: 0.0001 to 0.004%,
including one or both of, by mass %:
Ti: 0.01 to 0.1%; and
Nb: 0.005 to 0.1%; and
a balance consisting of Fe and impurities, so as to be the steel foil having a thickness of 5 μm or more and 15 μm or less and a tensile strength of more than 900 MPa and 1,200 MPa or less and a volume resistivity of less than 16 μΩcm by a cold-rolling under a cumulative rolling reduction of 90% or more and 98% or less.
4. The method for manufacturing a steel foil according to claim 3 , further comprising,
plating an outermost layer of the steel foil so as to form a Ni plated layer or a Cr plated layer after the foil-rolling.
5. The method for manufacturing a steel foil according to claim 4 , wherein the Ni plated layer is a soft Ni plated layer.
6. The method for manufacturing a steel foil according to claim 3 , further comprising,
plating an outermost layer of the steel sheet so as to form a Ni plated layer before the foil-rolling.
7. The method for manufacturing a steel foil according to claim 6 , wherein the Ni plated layer is a soft Ni plated layer.
8. The steel foil according to claim 1 ,
wherein a content of Mn is 0.01 to 0.2% by mass.
9. The steel foil according to claim 2 ,
wherein a content of Mn is 0.01 to 0.2% by mass.