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US3997370A Expired / Lapsed US ⏱️ 0.0 years remaining

Method of hot reducing ferrous and ferrous alloy products with composite martensitic nodular cast chill iron rolls

Assignee: Bethlehem Steel Corp
•
Filing: 1975-11-17
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Granted: 1976-12-14
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Expires: 1995-11-17
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Abstract

Abstract This invention is directed to a method of hot reducing ferrous and ferrous alloy products, such as plates, strip, bars and rods, where such products are heated to temperatures in excess of 1900° F and subsequently reduced at temperatures within the range of about 900° and the initial heating temperature. More particularly, this invention relates to the method of effecting said hot reducing at such temperatures by means of composite, martensitic, nodular graphite chill cast iron rolls. Such rolls are characterized by (1) an average surface hardness of at least about 76 Shore-C, (2) a thermal-crack-resistant chill cast surface portion consisting essentially of, by weight, about 3.00% to 3.70% carbon, about 0.35% to 1.25% manganese, about 1.0% to 2.0% silicon, about 3.75% to 5.75% nickel, about 0.75% to 1.35% chromium, about 0.40 to 1.10% molybdenum, about 0.3% to 0.08% magnesium, balance iron and incidential impurities, and (3) a core portion comprising a ferrous alloy.

Inventors

  • 👤 Paul J. Horvath, Jr.
  • 👤 John A. Gibbon

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-06 08:24
CPC Classifications
C; C22; C22C; C22C37/00; C22C37/06; C22C37/08; B; B21; B21B; B21B1/00; B21B1/22; B21B27/00; C21; C21D; C21D7/00; C21D7/13; B21B1/16; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12951; Y10T428/12958; Y10T428/12972

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 149 words
In a process of hot rolling ferrous and ferrous alloy products which products are heated to temperatures in excess of 1900° F and subsequently rolled at temperatures between about 900° F and the temperature of such initial heating, the improvement comprising in combination therewith the use of a thermal crack resistant composite work roll to effect said rolling, said composite work roll characterized by 1. a surface portion having a hardness of at least 76 Shore-C and consisting essentially of, by weight, about 3.00 to 3.70% carbon, about 0.35 to 1.25% manganese, about 1.0 to 2.0 silicon, about 3.75 to 5.75% nickel, about 0.75 to 1.35% chromium, about 0.40 to 1.10% molybdenum, about 0.03 to 0.08% magnesium, the balance iron and incidential impurities, and 2. a core portion comprising a ferrous alloy whose chemistry and mechanical properties are metallurgically compatible with the chemistry and properties of said surface portion.
Claim 2
Dependent Claim 149 words
In a process of hot rolling ferrous and ferrous alloy products which products are heated to temperatures in excess of 1900° F and subsequently rolled at temperatures between about 900° F and the temperature of such initial heating, the improvement comprising in combination therewith the use of a thermal crack resistant composite work roll to effect said rolling, said composite work roll characterized by 1. a surface portion having a hardness of at least 76 Shore-C and consisting essentially of, by weight, about 3.00 to 3.70% carbon, about 0.35 to 1.25% manganese, about 1.0 to 2.0 silicon, about 3.75 to 5.75% nickel, about 0.75 to 1.35% chromium, about 0.40 to 1.10% molybdenum, about 0.03 to 0.08% magnesium, the balance iron and incidential impurities, and 2. a core portion comprising a ferrous alloy whose chemistry and mechanical properties are metallurgically compatible with the chemistry and properties of said surface portion.
Claim 3
Dependent Claim 18 words
The process according to claim 1 wherein the hot rolling is effected at temperatures above about 1600° F.
Claim 4
Dependent Claim 41 words
The process according to claim 1 wherein the carbon is about 3.10 to 3.40%, manganese about 0.45 to 0.75%, silicon about 1.35 to 1.65%, nickel about 3.90 to 4.30%, chromium about 0.90 to 1.30%, and the molybdenum about 0.55 to 0.80%.
Claim 5
Dependent Claim 18 words
The process according to claim 1 wherein the surface portion has a hardness of at least 80 Shore-C.
Claim 6
Dependent Claim 18 words
The process according to claim 2 wherein the hot rolling is effected at temperatures above about 1800° F.

References Cited (Backward Citations)

US2129683A Cited
US3623850A Cited
US3670381A Cited
US3855015A Cited
US3894325A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1979-12-14 1980-06-14 1980-12-14 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1983-12-14 1984-06-14 1984-12-14 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1987-12-14 1988-06-14 1988-12-14 $7700.00 Window Closed / Lapsed

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