US3885997A
Expired / Lapsed
US
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Method of producing a hot rolled and age hardened columbium-bearing steel product
Assignee: Jones and Laughlin Steel Inc
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Filing: 1974-06-13
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Granted: 1975-05-27
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Expires: 1994-06-13
Abstract
Abstract A high strength low alloy steel product consisting essentially of 0.06 to 0.14 percent carbon, 0.6 to 1.5 percent manganese, 0.02 percent maximum silicon, 0.07 percent maximum phosphorous, 0.04 to 0.12 percent columbium, balance iron is produced in the hot rolled and aged condition by hot rolling at a finishing temperature of 1550* to 1650*F, collecting the steel at a temperature of 1000* to 1250*F and age hardening by continuous heat treatment at a temperature of 1050* to 1250*F for 0.5 to 5 minutes. The above treated product may be further subjected to galvanizing.
Inventors
- 👤 John H Bucher
- 👤 Daniel F Jancula
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:46
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/02; C21D8/0247; C21D8/0263; C22; C22C; C22C38/00; C22C38/12; C23; C23C; C23C2/00; C23C2/02; C23C2/022; C23C2/024; C21D8/0221; C21D8/0226; C21D8/0278
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
139 words
A PROCESS FOR PRODUCING A KILLED HIGH STRENGTH LOW ALLOY STEEL PRODUCT HAVING A YIELD STRENGTH IN EXCESS OF ABOUT 80,000 P.S.I. IN THE HOT ROLLED AND AGE HARDENED CONDITION, COMPRISING: A. HOT ROLLING A STEEL CONSISTING ESSENTIALLY OF 0.06 TO 0.14 PERCENT CARBON, 0.6 TO 1.5 PERCENT MANGANESE, 0.07 PERCENT MAXIMUM, PHOSPHOROUS, 0.04 TO 0.12 PERCENT COLUMBIUM, MOLYBDENUM IN RESIDUAL QUANTITIES, NITROGEN IN RESIDUAL QUANTITIES BALANCE IRON, AT A FINISHING TEMPERATURE OF FROM 1550* TO 1650*F, B. COLLECTING SAID HOT ROLLED STEEL AT A TEMPERATUE OF FROM 1000* TO 125*F, AND C. AGE HARDENING SAID HOT ROLLED STEEL BY CONTINOUSLY HEAT TREATING THE STEEL AT A TEMPERATURE OF FROM 1050* TO 1250*F FOR A TIME OF FROM 0.5 TO 5 MINUTES SO AS TO INCREASE THE YIELD STRENGTH OF SAID HOT ROLLED STEEL BY FROM ABOUT 3,000 P.S.I.
Claim 2
Dependent Claim
139 words
A PROCESS FOR PRODUCING A KILLED HIGH STRENGTH LOW ALLOY STEEL PRODUCT HAVING A YIELD STRENGTH IN EXCESS OF ABOUT 80,000 P.S.I. IN THE HOT ROLLED AND AGE HARDENED CONDITION, COMPRISING: A. HOT ROLLING A STEEL CONSISTING ESSENTIALLY OF 0.06 TO 0.14 PERCENT CARBON, 0.6 TO 1.5 PERCENT MANGANESE, 0.07 PERCENT MAXIMUM, PHOSPHOROUS, 0.04 TO 0.12 PERCENT COLUMBIUM, MOLYBDENUM IN RESIDUAL QUANTITIES, NITROGEN IN RESIDUAL QUANTITIES BALANCE IRON, AT A FINISHING TEMPERATURE OF FROM 1550* TO 1650*F, B. COLLECTING SAID HOT ROLLED STEEL AT A TEMPERATUE OF FROM 1000* TO 125*F, AND C. AGE HARDENING SAID HOT ROLLED STEEL BY CONTINOUSLY HEAT TREATING THE STEEL AT A TEMPERATURE OF FROM 1050* TO 1250*F FOR A TIME OF FROM 0.5 TO 5 MINUTES SO AS TO INCREASE THE YIELD STRENGTH OF SAID HOT ROLLED STEEL BY FROM ABOUT 3,000 P.S.I.
Claim 3
Dependent Claim
56 words
A process for producing a killed high strength low alloy steel product having a yield strength in excess of about 80,000 p.s.i. in the hot rolled and age hardened condition according to claim 1, wherein: the steel consists essentially of 0.08 to 0.12 percent carbon, 1.0 to 1.2 percent manganese, and 0.05 to 0.10 percent columbium.
Claim 4
Dependent Claim
43 words
A process for producing a killed high strength low alloy steel product having a yield strength in excess of about 80,000 p.s.i. in the hot rolled and age hardened condition according to claim 1, wherein: the steel consists essentially of .02% maximum molybdenum.
Claim 5
Dependent Claim
74 words
A process for producing a killed high strength low alloy steel product having a yield strength in excess of about 80,000 p.s.i. in the hot rolled and age hardened condition according to claim 1, wherein: said steel further consists essentially of a sulfide inclusion shape control agent selected from the group consisting of zirconium, titanium, and rare earths in an amount sufficient to form globular sulfides in the hot rolled and age hardened condition.
Claim 6
Dependent Claim
64 words
A process for producing a killed high strength low alloy steel product having a yield strength in excess of about 80,000 p.s.i. in the hot rolled and age hardened condition according to claim 1, which further includes: passing said hot rolled and age hardened steel product through a molten zinc bath whereby said hot rolled and age hardened steel product is coated with zinc.
Claim 7
Dependent Claim
46 words
A process for producing a killed high strength low alloy steel product having a yield strength in excess of about 80,000 p.s.i. in the hot rolled and age hardened condition according to claim 5, wherein: the steel consists essentially of a maximum of 0.02 percent silicon.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |