Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1991-07-30
1992-06-30
Yee, Deborah
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
148601, 148662, C21D 806
Patent
active
051259877
ABSTRACT:
A method for direct patenting of a hot-rolled wire rod comprises the steps of: transporting a hot-rolled wire rod on a conveyer in a state that said wire rod is in a form of continuous series of loops; blasting mist to the surface of said wire rod at least from above and blasting air to the back side of the wire rod from below to cool the wire rod at a rate of 12.degree. C. to 50.degree. C./sec. down to 550.degree. C. to 400.degree. C. during the transportation, the mist provides 200 to 2400 l/min. water and has an air to water ratio of 200 Nm.sup.3 /m.sup.3 or less; and reheating the cooled wire rod at a rate of 3.degree. C./sec. or less, or cooling the cooled wire rod slowly at a rate of 2.degree. C./sec. or less during the transportation. In addition, another method for direct patenting of a hot-rolled wire rod comprises the steps of: transporting a hot-rolled wire rod on a conveyer in a state that the wire rod is in a form of continuous series of loops; cooling, as a first cooling step, the wire rod at a rate of 12.degree. to 40.degree. C./sec. down to 600.degree. C. to 450.degree. C. during the transportation by means of blasting a cooling medium to the wire rod for 5 secs. to 30 secs.; and cooling, as a second cooling step, the cooled wire rod st a rate of 2.degree. C. to 15.degree. C./sec.down to 550.degree. C. to 400.degree. C. during the transportation by means of blasting a cooling medium to the wire rod cooled in the first cooling step for 5 secs. to 30 secs.
Eguchi Toyoaki
Ito Katsumi
Ohsuzu Hirotada
Ohwada Noriyoshi
Sagae Yutaka
Toa Steel Co., Ltd.
Yee Deborah
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