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US4033766A Expired / Lapsed US ⏱️ 0.0 years remaining

Continuous stream treatment of ductile iron

Assignee: Ford Motor Co
•
Filing: 1976-02-02
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Granted: 1977-07-05
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Expires: 1996-02-02
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Abstract

Abstract A method and apparatus for producing modified grey iron, and particularly nodular cast iron, is disclosed. The apparatus comprises refractory elements including an inclined flow course for continuous reception of molten grey iron, a V-shaped inclined receptacle interposed in said course into which a predetermined supply of modifying agent, such as magnesium, is injected to react with said iron, and means for controlling the egress of iron from the receptacle in order to sequentially stage the build-up and dissipation of a pool of iron in said receptacle facilitating chemical reactions and thorough mixing for attaining and improving the homogeneity of the modified iron elements. The product and composition uniquely is characterized by about 3.5 carbon, by weight, 2.5% silicon, 0.2-0.9Mn sulfur no greater than 0.015%, the remainder being essentially iron; the composition is devoid of carbide and dross or slag and has a graphite nodule count of at least 400 per square millimeter in a 1/2 inch section.

Inventors

  • 👤 Gerald S. Cole
  • 👤 Bela V. Kovacs
  • 👤 Robert A. Sensoli
  • 👤 Herschel B. Smartt

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 23:34
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/10; C22; C22C; C22C33/00

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 75 words
A nodularized cast iron article consisting essentially of 3.5 carbon, 2% -2.5% silicon, the carbon/silicon ratio being about 7:5, about 0.6 manganese, sulfur being no greater than 0.015%, 0.04%-055% magnesium, the remainder being essentially iron, said composition being particularly characterized by the absence of carbides and dross, at least 90% of graphite nodules are spherical in shape, and has a graphite nodule count of at least 400 per square millimeter in a 1/2 inch section.
Claim 2
Dependent Claim 75 words
A nodularized cast iron article consisting essentially of 3.5 carbon, 2% -2.5% silicon, the carbon/silicon ratio being about 7:5, about 0.6 manganese, sulfur being no greater than 0.015%, 0.04%-055% magnesium, the remainder being essentially iron, said composition being particularly characterized by the absence of carbides and dross, at least 90% of graphite nodules are spherical in shape, and has a graphite nodule count of at least 400 per square millimeter in a 1/2 inch section.

References Cited (Backward Citations)

US2867555A Cited
US3726670A Cited
US3193383A Cited
US3598576A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1980-07-04 1981-01-03 1981-07-05 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1984-07-04 1985-01-03 1985-07-05 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1988-07-04 1989-01-03 1989-07-05 $7700.00 Window Closed / Lapsed

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