Method for minimizing surface roughening of tungsten-containing

Details Method for minimizing surface roughening of tungsten-containing Method for minimizing surface roughening of tungsten-containing

1992-11-04

1995-04-25

Kastler, Scott

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148243, C23C 2200

Patent

active

054095514

ABSTRACT:
A method for improving the resistance to surface roughening of tungsten-containing metallic articles such as cutting tools and hot mill rolls made of a cemented carbide or high-speed steel and extending the lifetime thereof. The method comprises treating a metallic article with an aqueous alkaline solution containing calcium ions and optionally tungstate ions having a pH greater than 8 so as to form a coating of calcium tungstate on the surface of the metallic article. In hot rolling with tungsten-containing rolls, the aqueous solution can be used as at least part of a cooling water to cool the rolls, thereby extending the period before roll replacement becomes necessary due to surface roughening and decreasing the frequency of roll dressing required during hot rolling.

REFERENCES:
patent: 2653882 (1953-09-01), Treseder
patent: 4355079 (1982-10-01), Rosenberg et al.
patent: 4818572 (1989-04-01), Shimamune et al.
"Evolution of Steel Wire Hot Rolling Rolls", Niibayashi et al., printed in a company journal of Sumitomo Electric Industry, Japan, No. 123, pp. 113-122 Sep. 1958.

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