Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1982-11-17
1984-04-03
Brody, Christopher W.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
266 80, 266 87, 148156, 432 8, C21D 1100
Patent
active
044405839
ABSTRACT:
In controlledly cooling steel strip in a continuous annealing line, the heat transfer rate needed for attaining the desired cooling rate is calculated from an equation including strip thickness, the cooling starting and finishing temperatures, and the desired cooling rate, and the obtained heat transfer rate is corrected according to the effect of natural cooling in idle-pass zones preceding and following the coolant spray zone. The flow rate of coolant is determined and set by using an equation expressing the predetermined relationship between the heat transfer rate and coolant flow rate. The length of the coolant spraying region extending in the direction of strip travel is calculated from the running speed of the strip, the cooling starting and finishing temperatures, and the desired cooling rate. The nozzles are set to turn on and off so that the coolant is sprayed from such a number of nozzles as correspond to the length of the spraying region thus calculated. Based on these settings, the coolant flow rate is corrected by re-calculating the heat transfer rate when strip thickness varies in the course of controlled cooling. Also, the on-off pattern of the nozzles is corrected by re-calculating the length of the coolant spraying region when the running speed of the strip varies.
REFERENCES:
patent: 3533261 (1970-10-01), Hollander et al.
patent: 3589160 (1971-06-01), Gruver et al.
patent: 3604234 (1971-09-01), Hinricksen
patent: 3613418 (1971-10-01), Nara et al.
patent: 3779054 (1973-12-01), Greenberger
patent: 4243441 (1981-01-01), Wilson
Ikegami Hiroshi
Nagira Norichika
Yui Katsuhiko
Brody Christopher W.
Nippon Steel Corporation
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