Metal treatment – Stock – Ferrous
Patent
1995-09-20
1997-07-08
Yee, Deborah
Metal treatment
Stock
Ferrous
148610, C22C 3858
Patent
active
056456549
ABSTRACT:
A nonmagnetic stainless steel for high burring has the absolute value of the plane anisotropy .DELTA.r of the Lankford value r of 0.12 or under, the .DELTA.r being .DELTA.r=(r.sub.0 +r.sub.90 -2r.sub.45)/2 wherein r.sub.0. r.sub.45, and r.sub.90 are the r-values at angles of 0.degree., 45.degree., and 90.degree., respectively, to the direction of rolling to which the steel is subjected. The nonmagnetic stainless steel is useful for electron tube parts, especially for the electrodes of electron guns for color picture tubes and is made by the steps of adjusting the grain size of a nonmagnetic stainless steel before final rolling to the range from 4.0 to 7.0 in the austenite grain size conforming to JIS G0551, finishing the work to a desired thickness by final cold rolling to a cold reduction of 20 to 50%, and finally annealing the same to an austenite grain size according to JIS G0551 ranging from 7.0 to 12.0.
REFERENCES:
patent: 3989474 (1976-11-01), Goller et al.
patent: 5098652 (1992-03-01), Yasui et al.
Nakagawa et al., Pressworking of Sheet Metals, published by Jikkyo Shuppan K.K. (Oct. 10, 1977) pp. 179-185.
Nishikawa Kiyoaki
Ono Toshiyuki
Ozeki Yoshihiro
Nippon Mining & Metals Co., Ltd.
Yee Deborah
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