Titanium ring for an electrodeposition drum and a method for its

Details Titanium ring for an electrodeposition drum and a method for its Titanium ring for an electrodeposition drum and a method for its

1996-07-03

1998-01-27

Sheehan, John

Stock material or miscellaneous articles

All metal or with adjacent metals

Workpiece with longitudinal passageway or stopweld material

204212, 204281, 204272, 205 73, 205 77, C21D 908

Patent

active

057120463

ABSTRACT:
A titanium ring for an electrodeposition drum has an attractive, uniform surface without patterns comprising bright and dark spots which are formed during surface polishing. The ring has a thickness of 4-30 mm and a surface hardness when it has been polished to an average surface roughness Ra of at most 0.3 .mu.m such that the difference between the maximum and minimum Vickers hardness measured with a load of at most 1 kg at 10 or more points disposed at a pitch of 0.3-1 mm along a line in an arbitrary direction along the surface is at most 10. The ring can be manufactured by welding of a rolled plate or by ring rolling of a tube. When the temperature of the material forming the ring is heated to at least its .beta. transformation point, cooling past the .beta. transformation point is carried out at a rate of at least 1000.degree. C. per hour. Subsequent working or heat treatment is carried out below the .beta. transformation point.

REFERENCES:
patent: 3767537 (1973-10-01), Selker
patent: 4647345 (1987-03-01), Polan

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