Production method of rolled sheet for cold-rolling, and production method of pure titanium sheet
First Claim
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1. A method for producing a rolled sheet for cold-rolling, the method consisting of:
- hot-rolling a pure titanium material while coiling;
annealing a hot-rolled sheet formed by the hot-rolling; and
removing an oxidized layer formed on a surface of the hot-rolled sheet during the hot-rolling and the annealing,wherein;
a coiling temperature in the hot-rolling is less than or equal to 500°
C.;
the annealing is performed by raising a temperature of the hot-rolled sheet formed by the hot-rolling to an elevated temperature T ranging from 650°
C. to 750°
C. and subsequently maintaining the hot-rolled sheet at the elevated temperature T for a duration t satisfying (2), (4), or (5) as follows, depending on the elevated temperature T;
(2) 80 sec ≤
t≤
160 sec when 680°
C. ≤
T≤
720°
C.,(4) 160 sec <
t≤
200 sec when 650°
C. ≤
T<
680°
C., and(5) 40 sec ≤
t<
80 sec when 720°
C. <
T≤
750°
C.; and
the annealing is controlled such that a percentage area of recrystallized grains in a microstructure of the hot-rolled sheet after the annealing is greater than or equal to 90%, and that a mean grain diameter of the recrystallized grains is greater than or equal to 6 μ
m and less than or equal to 10 μ
m.
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Abstract
An aspect of the present invention is a production method of a rolled sheet for cold-rolling, the method being characterized by including: a hot-rolling step for forming a rolled sheet by hot-rolling a pure titanium material while coiling; and an annealing step for annealing the hot-rolled sheet after the hot-rolling step, the coiling temperature in the hot-rolling step being 500° C. or less, and the annealing step being controlled so that the percentage area of recrystallized grains in the microstructure of the hot-rolled sheet after annealing is at least 90% and the mean grain size of the recrystallized grains is 5 μm to 10 μm.
1 Citation
3 Claims
-
1. A method for producing a rolled sheet for cold-rolling, the method consisting of:
-
hot-rolling a pure titanium material while coiling; annealing a hot-rolled sheet formed by the hot-rolling; and removing an oxidized layer formed on a surface of the hot-rolled sheet during the hot-rolling and the annealing, wherein; a coiling temperature in the hot-rolling is less than or equal to 500°
C.;the annealing is performed by raising a temperature of the hot-rolled sheet formed by the hot-rolling to an elevated temperature T ranging from 650°
C. to 750°
C. and subsequently maintaining the hot-rolled sheet at the elevated temperature T for a duration t satisfying (2), (4), or (5) as follows, depending on the elevated temperature T;(2) 80 sec ≤
t≤
160 sec when 680°
C. ≤
T≤
720°
C.,(4) 160 sec <
t≤
200 sec when 650°
C. ≤
T<
680°
C., and(5) 40 sec ≤
t<
80 sec when 720°
C. <
T≤
750°
C.; andthe annealing is controlled such that a percentage area of recrystallized grains in a microstructure of the hot-rolled sheet after the annealing is greater than or equal to 90%, and that a mean grain diameter of the recrystallized grains is greater than or equal to 6 μ
m and less than or equal to 10 μ
m. - View Dependent Claims (2, 3)
-
Specification