Metal treatment – Compositions – Heat treating
Patent
1988-06-09
1989-12-26
Yee, Deborah
Metal treatment
Compositions
Heat treating
148 12F, 148 12C, C21D 802
Patent
active
048895660
ABSTRACT:
An extra-low carbon cold rolled steel sheet useful for use in automobiles, and the like, having an improved spot weldability is obtained by combining and adding Ti, Nb and B in predetermined amounts to the extra-low carbon steel to control the amount of fine Ti precipitate dispersed in steel to within a specified reasonable range. Furthermore, the spot weldability is improved by controlling the production conditions of the extra-low carbon steel sheet to within specified reasonable ranges.
REFERENCES:
patent: 4504326 (1985-03-01), Tokunagn et al.
patent: 4615749 (1986-10-01), Satoh et al.
Imanaka Makoto
Masui Susumu
Obara Takashi
Okada Susumu
Shinozaki Masatoshi
Kawasaki Steel Corporation
Yee Deborah
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