Typewriting machines – Typing by other than type-face or type-die – Character formation by impact
Patent
1998-06-03
2000-11-14
Yan, Ren
Typewriting machines
Typing by other than type-face or type-die
Character formation by impact
101 9348, B41J 200
Patent
active
061460338
ABSTRACT:
A new high strength steel alloy characterized by having high DC magnetic saturation, ultra high tensile, yield and fatigue strengths that is particularly suited for use as a hammerspring in hammerbanks in impact printers and for other applications where magnetic alloys are used and high mechanical strength is desirable. The alloy is formed of the following composition in weight percent: about 20% to about 35% Co; about 2% to about 6.0% Ni; about 0.0 to about 0.15% C; about 0.75% to about 3% Mo; 0% to about 3.0% Cr; 0% to about 2% Mn; 0% to about 0.02% Si; 0% to about 0.003% P; 0% to about 0.001% S; 0% to about 0.005% O.sub.2 +N.sub.2 ; with the balance comprised of Fe.
A process for making the alloy includes homogenizing preferably at a temperature of 2150.degree. F. for 24 hours, and solution treating at a temperature in the range of about 1500.degree. F. to about 1700.degree. F. under a vacuum or inert gas protective atmosphere; air-cooling; and precipitation aging at a temperature in the range of about 800.degree. F. to about 1100.degree. F. for about 6 to about 36 hours.
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Chang Y. Grant
Farb Norman E.
Bethel George F.
Printronix, Inc.
Yan Ren
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