Title: Prequench cooling for galvanized tubing

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.

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Inventors: Rogove, Arthur H. (Cinnaminson, NJ, US)
Hijuelos, Augusto H. (New Lenox, IL, US)

Application Number: 829667
Filing Date: 1977-09-01
Publication_date: 1978-11-14
Assignee: Allied Tube & Conduit Corporation (Harvey, IL)
Primary Class(es): 29/527.4 29/460, 118/69, 266/113, 427/398.3
Other Classes:
US Patent Ref:

2094583	Oct, 1937	Cook et al.	427/390.
2197622	Apr, 1940	Sendzmir	118/69.
2287825	Jun, 1942	Postlewaite	118/69.
2771669	Nov, 1956	Armstrong et al.	29/460.
3274679	Sep, 1966	Kennedy	29/460.
3507712	Apr, 1970	Scott	266/113.
3524245	Aug, 1970	Searing	29/460.
3696503	Oct, 1972	Krengel et al.	29/527.
3743535	Jul, 1973	Padjen et al.	423/398.
3768145	Oct, 1973	Ostrowski	29/460.
3845540	Nov, 1974	Rossi	266/3.

Other Refs:
Primary Examiner: Gilden, Leon
Assistant Examiner:
Attorney: Fitch, Even, Tabin & Luedeka