Prequench cooling for galvanized tubing

Details Prequench cooling for galvanized tubing Prequench cooling for galvanized tubing

1977-09-01

1978-11-14

Gilden, Leon

Metal working

Method of mechanical manufacture

Combined manufacture including applying or shaping of fluent...

29460, 118 69, 266113, 427398B, B23P 1700

Patent

active

041249321

ABSTRACT:
Steel strip is continuously roll-formed into tubular shape, seam-welded and coated with zinc in a galvanizing bath. The coated tubing is promptly cooled by a prequench flow of cooling water flowing in the direction of movement of the tubing, thus superficially hardening the zinc. Water is pumped into the prequench zone through passageways arranged radial to the tubing and at an angle between 20.degree. and 40.degree. to the direction of movement. Final cooling is effected by immersion in a water bath. Heavier and smoother zinc coatings can be applied as a result.

REFERENCES:
patent: 2094583 (1937-10-01), Cook et al.
patent: 2197622 (1940-04-01), Sendzmir
patent: 2287825 (1942-06-01), Postlewaite
patent: 2771669 (1956-11-01), Armstrong et al.
patent: 3274679 (1966-09-01), Kennedy
patent: 3507712 (1970-04-01), Scott
patent: 3524245 (1970-08-01), Searing
patent: 3696503 (1972-10-01), Krengel et al.
patent: 3743535 (1973-07-01), Padjen et al.
patent: 3768145 (1973-10-01), Ostrowski
patent: 3845540 (1974-11-01), Rossi

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