Title:
NIOBIUM PLATE MATERIAL AND METHOD FOR MANUFACTURING THE SAME
Document Type and Number:
Japanese Patent JP2022092543
Kind Code:
A
Abstract:
To provide a niobium plate material which achieves high yield strength, and a method for manufacturing the same.SOLUTION: A niobium plate material has a yield strength of 65 MPa or more, surface hardness of HV 60 or less, in which internal hardness of a central part in a thickness direction is smaller than the surface hardness, and a difference between the surface hardness and the internal hardness is 15% to 50% the internal hardness. A method for manufacturing a niobium plate material manages yield strength imparting processing using a radius of curvature R represented by the following expression (1) and a total surface strain amount εsum represented by expression (2), in warpage processing when a plate width that is a dimension of a niobium plate base material in a conveyance direction when the niobium plate base material is warped is represented by W, a thickness is represented by t, and a warpage amount from a plane when it is warped is represented by h, a radius of geometrical curvature of warpage of the niobium plate base material is represented by R, an amount of surface bending strain remaining in the niobium plate base material in leveler processing is represented by ε, and the number of leveler processing is represented by n. Expression (1): R=h/2+W2/(8h). Expression (2): εsum=nε=n(t/2)/R.SELECTED DRAWING: None
Inventors:
SHIBASAKI KAZUMA
MASUI HIROAKI
SHINOSAWA SEIICHI
MASUI HIROAKI
SHINOSAWA SEIICHI
Application Number:
JP2020205419A
Publication Date:
June 22, 2022
Filing Date:
December 10, 2020
Export Citation:
Assignee:
ULVAC CORP
International Classes:
B21B3/00; B21B1/00; B21D1/05
Attorney, Agent or Firm:
Hiroyuki Kurihara