Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Patent
1979-12-17
1981-04-28
Kendall, Ralph S.
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
428659, 4273839, 427433, C23C 102, C23C 108
Patent
active
042646847
ABSTRACT:
This invention is directed to an improved zinc containing metallic coated ferrous product, particularly sheet and strip, which is resistant to intergranular penetration by zinc and embrittlement of the ferrous base. Use of such zinc containing metallic coated ferrous product in elevated-temperature service, such as found with certain appliances and automotive exhaust components, is enhanced by the coated products of this invention. The resistance to embrittlement of the zinc containing metallic coated ferrous base, when subjected to elevated service temperatures, is achieved by the use of a high-phosphorus containing steel base. For a plain content steel base, a phosphorus content of at least 0.020% by weight, preferably at least 0.030%, and more preferably at least 0.039% was found sufficient to render such zinc-alloy coated ferrous base resistant to embrittlement by zinc.
By use of such high phosphorus ferrous base, for the reception of a zinc containing alloy coating, an improved metallic coated ferrous product has been found which resists intergranular penetration by zinc and embrittlement of the ferrous base. Such coated product has extended service life at temperatures above about 450.degree. F. (232.degree. C.) and when restored to room temperature possesses a high degree of ductility.
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patent: 3782909 (1974-01-01), Cleary et al.
patent: 4053663 (1977-10-01), Caldwell et al.
Bablik, Galvanizing, E. & F. N. Spon. Ltd., 1926, pp. 56, 57.
Gerber, The Influence of Steel Quality on Coating Thickness in Hot Dip Galvanizing, 5th International Conf. on Hot Dip Galvanizing, 1958, pp. 267-270.
Horstmann, The influence of steel and of galvanizing conditions . . . 7th International Conf. on Hot Dip Galvanizing, Jun. 1964, pp. 146-166.
Allegra Louis K.
Horton James B.
Townsend Herbert E.
Bethlehem Steel Corporation
Kendall Ralph S.
Noll William B.
O'Keefe Joseph J.
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