B - Operations – Transporting – 21 – B
Patent
B - Operations, Transporting
21
B
B21B 27/00 (2006.01) B21B 1/22 (2006.01) C25D 5/02 (2006.01)
Patent
CA 2095228
In order to improve the sharpness, after painting, of a steel strip and, at the same time, improve the press moldability of the steel strip, the steel strip of the present invention is characterized by having a plurality of small recessed portions transferred by means of a rolling dull roll having a protrusion composed mainly of ?r and homogeneously provided on the surface of the roll; the recessed portion having a configuration satisfying requirements of a diameter, d, of 50 to 500 µm, a depth, h, of the recessed portion of 2 to 40 µm and a total volume of recessed portions per mm2 of the surface of the steel strip of 0.10 x 106 µm3 or more, the center line distance, P1, between recessed portions adjacent to each other in the direction of rolling being in the range of from 1.0d to 4.0d, the center line distance, P2, between rows in the direction of rolling being in the range of from 1.0d to 4.0d.
Hamamoto Yasuo
Kawamoto Takaharu
Nawata Yasutaka
Shiozawa Shuichi
Toyota Hiromi
Goudreau Gage Dubuc
Nippon Steel Corporation
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