Metallurgical apparatus – With control means responsive to sensed condition – With means responsive to condition of treated material
Patent
1974-05-20
1976-02-10
Lake, Roy
Metallurgical apparatus
With control means responsive to sensed condition
With means responsive to condition of treated material
134170, 148153, 266 3R, 266 4S, C21D 162, C21D 914
Patent
active
039374483
ABSTRACT:
This invention relates to an apparatus wherein the setting angles of cooling water jetting orifices and an outer quenching head and an inner quenching head are made 30.degree..+-.10.degree. in the pipe advancing direction with the pipe axis, and the number of jetting orifices of the inner quenching head are greater for purposes of higher density for the front 1/3 of the length of the head and lower for purposes of lower density for the rear 2/3 of the length of the head.
Further, the first contact point of inner quenching water within the inner surface of the pipe is so set as to be delayed by 20 to 150mm. from the first contact point of quenching water with the outer surface of the pipe, the outer quenching being carried out when the steel pipe heating temperature is above the A.sub.3 transformation point and the inner quenching is carried out when the temperature of the inner surface of the pipe is just below the A.sub.1 transformation point.
REFERENCES:
patent: 2616437 (1952-11-01), Secor
patent: 3062227 (1962-11-01), Soderberg
patent: 3507712 (1970-04-01), Scott
patent: 3675908 (1972-07-01), Amend
patent: 3804390 (1974-04-01), Jennings et al.
patent: 3807714 (1974-04-01), Hollyer
Fujii Yoshihisa
Fujiwara Akio
Bell Paul A.
Lake Roy
Sumitomo Metal Industries Limited
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