Method for direct patenting of a hot-rolled wire rod

Details Method for direct patenting of a hot-rolled wire rod Method for direct patenting of a hot-rolled wire rod

1989-06-06

1991-08-27

Yee, Deborah

Metal treatment

Compositions

Heat treating

148 12B, 148143, C21D 806

Patent

active

050430262

ABSTRACT:
A method for direct patenting of a hot-rolled wire rod comprises the steps of: transporting a hot-rolled wire rod on a conveyor 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 conveyor 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 at a rate of 2.degree. C. to 15.degree. C./sec. down to 550.degree. C. to 400.degree. C. during the transporation by means of blasting a cooling medium to the wire rod cooled in the first cooling step for 5 secs. to 30 secs.

REFERENCES:
patent: 4320646 (1982-03-01), Bindernagel et al.

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