Method of pretreating connecting elements of a gas-tight sleeve-

Details Method of pretreating connecting elements of a gas-tight sleeve- Method of pretreating connecting elements of a gas-tight sleeve-

1992-06-24

1994-01-04

Shine, W. J.

Coating processes

Interior of hollow article coating

Metal base

427327, 252 25, 252 28, B05D 508, B05D 722, C10M11308, C10M12522, C10M12522

Patent

active

052758451

ABSTRACT:
A method of pretreating the connecting elements of a gas-tight sleeve-type pipe connection which includes a tight metal seat and abutting joint shoulders. The connection is effected by screwing threaded pipe ends into a sleeve having threaded portions. The pipes are of high-alloy steel and the connecting elements are of austenitic steels with chromium and nickel contents of greater than 20% by weight and molybdenum contents of greater than 2.5% by weight, as well as austenitic materials with nickel contents of greater than 50% and chromium and molybdenum contents of greater than 10% by weight. The connecting elements of the sleeve are coated with a metal layer. The method includes cleaning the connecting elements and subsequently applying as a lubricant on the connecting elements a metal-free, ceramic-based paste whose principal components are silicates, titanium oxide, and zinc sulfide as solid components, as well as vegetable oils and white oils.

REFERENCES:
patent: 2412929 (1946-12-01), Bogart et al.
patent: 3309313 (1967-03-01), Callahan
patent: 4755308 (1988-07-01), Holinski et al.
patent: 5069761 (1991-12-01), Krings et al.
Boner, C. J., "Manufacture and Application of Lubricating Greases", Robert E. Krieger Publishing Co., Inc. Huntington, N.Y., 1971, pp. 175, 783 and 793.

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