Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1986-08-05
1987-12-15
Tufariello, T. M.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204210, C25F 106, C25F 700
Patent
active
047131543
ABSTRACT:
In a method of continuously annealing and pickling steel strips successively transferred through a continuous annealing apparatus including heating and cooling zones and a pickling apparatus, annealing the steel strips is effected in reducing atmosphere and thereafter pickling is effected at least by nitric acid electrolytic treatment. In an apparatus for continuously annealing and pickling steel strips, including a continuous annealing furnace and a pickling apparatus, the continuous annealing furnace consists of vertical furnaces capable of advancing a steel strip in a manner substantially repeating upward and downward movements alternately in substantially vertical directions and the pickling apparatus comprises at least a nitric acid electrolytic cell. In another aspect, continuous annealing furnace consists of one pass furnace capable of advancing the steel strip only once and forming a high temperature heating zone and a high temperature cooling zone of the annealing furnace, and vertical furnaces respectively forming a lower temperature heating zone and a low temperature cooling zone and capable of advancing a steel strip in a manner substantially repeating upward and downward movements alternately in substantially vertical directions. The one pass furnace is horizontal or vertical.
REFERENCES:
patent: 1704015 (1929-03-01), Naugle et al.
patent: 2045392 (1936-06-01), Keintz, Jr.
patent: 3429792 (1969-02-01), Fukui
patent: 3826693 (1974-07-01), Fisher
patent: 4618379 (1986-10-01), Bruno
Metallurgia, vol. 76, No. 458, Dec. 1967.
Kaihara Toshikazu
Kishida Akira
Ochiai Masanobu
Ohta Norio
Sato Kuniaki
Kawasaki Steel Corporation
Tufariello T. M.
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