Metal treatment – Compositions – Heat treating
Patent
1986-02-07
1988-01-12
Dean, R.
Metal treatment
Compositions
Heat treating
148 132, 148 14, C22F 100
Patent
active
047189509
ABSTRACT:
A process for selectively annealing metal strips, which comprises forming a deposit in the form of a continuous or intermittent stripe or stripes of graphite powder at least 50% of which is 20 .mu.m or less in particle diameter, on one side or both sides of a metal strip, and then heating the deposit by laser or a high-luminance light source to form a selectively annealed portion or portions. The graphite powder is one graphitized at a temperature of 3000.degree. C. or above. The deposit is 500 .mu.m or less in thickness. The graphite powder has a true density of 2.1 g/cm.sup.3 or above. It has an average interplanar spacing between planes of the carbon hexagon of 3.60 .ANG. or below. Its microcrystal grain diameter is 500 .ANG. or more. In another aspect of the invention, a process for selectively annealing metal strips is provided which is characterized by the steps of forming a continuous or intermittent stripe or stripes of a deposit of graphite powder on one side or both sides of a metal strip having a mirror reflectivity of at least 20% on the surface, and then heating the deposit by a high-luminance light source to form a selectively annealed portion or portions. Here again, it is desirable to use a graphite powder having characteristics as described above.
REFERENCES:
patent: 3234055 (1966-02-01), Feng
Dean R.
Nippon Mining Co., Ltd.
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