US3834949A
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Hot rolled flat steel article for cryogenic service and method for producing same
Assignee: Inland Steel Co
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Filing: 1973-02-14
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Granted: 1974-09-10
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Expires: 1993-02-14
Abstract
Abstract A HOT ROLLED, FLAT STEEL ARTICLE INCLUDING 2.0-3.0 WT. PERCENT NICKEL, 0.4-1.0 WT. PERCENT MANGANESE, 3.0-3.5 WT. PERCENT NICKEL PLUS MANGANESE, 0.2-0.8 SILICON, 0.01-0.02 COLUMNIUM AMD 0.02-0.03 VANADIUM. PROCESSING INCLUDES A HOT ROLL FINISHING TEMPERATURE BELOW 1700*F., A FINISHING DEFORMATION OF AT LEAST 30%, AND NORMALIZING. FINISHING ABOVE 1700*F. OR A DEFORMATION LESS THAN 30% IS FOLLOWED BY TWO NORMALIZING OPERATIONS. THE RESULTING ARTICLE HAS STRENGTH AND TOUGHNESS RENDERING IT USEFUL AT LOW TEMPERATURES IN THE RANGE -150*F. TO -250*F.
Inventors
- 👤 W Heitmann
- 👤 T Oakwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:36
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/08; C21; C21D; C21D8/00; C21D8/02; C21D8/0221; C21D8/0226; C21D1/00; C21D1/26; C21D1/28; C21D8/0247; C21D8/0263
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
129 words
A hot rolled, flat steel article having a composition consisting essentially of, in wt. percent: Carbon eee 0.05-0.10. Manganese ceo 0.4-1.0. Phosphorous __________....__ 0.01 max. Sulfur oo 0.01 max Silicon ooo 0.20.8. Aluminum _.____.._________ 0.02-0.05. Columbium _______________ 0.01-0.02. Vanadium _______________ 0.02-0.03. Nitrogen _________________ 0.008-0.012. Nickel oo. 2.0-3.0. Iron Essentially the balance. Nickel plus manganese ___._.__ 3.0-3.5. said hot rolled, flat steel article having an average yield strength in the range 60,000-70,000 p.s.i.; said flat steel article having a microstructure consisting essentially of a ferrite matrix and FeyC, with the average ferrite grain size being no coarser than ASTM No. 11.5; said flat steel article having longitudinal Charpy V- notch energy of 15 foot pounds at a temperature in the range —200° F. to —250° F., on a full-size sample.
Claim 2
Dependent Claim
129 words
A hot rolled, flat steel article having a composition consisting essentially of, in wt. percent: Carbon eee 0.05-0.10. Manganese ceo 0.4-1.0. Phosphorous __________....__ 0.01 max. Sulfur oo 0.01 max Silicon ooo 0.20.8. Aluminum _.____.._________ 0.02-0.05. Columbium _______________ 0.01-0.02. Vanadium _______________ 0.02-0.03. Nitrogen _________________ 0.008-0.012. Nickel oo. 2.0-3.0. Iron Essentially the balance. Nickel plus manganese ___._.__ 3.0-3.5. said hot rolled, flat steel article having an average yield strength in the range 60,000-70,000 p.s.i.; said flat steel article having a microstructure consisting essentially of a ferrite matrix and FeyC, with the average ferrite grain size being no coarser than ASTM No. 11.5; said flat steel article having longitudinal Charpy V- notch energy of 15 foot pounds at a temperature in the range —200° F. to —250° F., on a full-size sample.
Claim 3
Dependent Claim
33 words
A hot rolled, flat steel article as recited in Claim 1 and having a composition consisting essentially of, in wt. percent: Manganese Nickel Silicon said average yield strength being at least 67,000 p.s.i.
Claim 4
Dependent Claim
23 words
A hot rolled, flat steel article as recited in Claim 1 and comprising steel plate having a thickness of ¥ to 1% inches.
Claim 5
Dependent Claim
17 words
A hot rolled, flat steel article as recited in Claim 1 wherein said Fe;C is non-lamellar. 3,834,949
Claim 6
Independent Claim
108 words
A method for producing a hot rolled, flat steel article, said method comprising the steps of: providing a steel having the following composition in wt. percent: Carbon woe 0.05-0.10. Manganese — cee meeam 0.4-1.0. Phosphorous ——-emeeeem— 0.01 max. Sulfur wee 0.01 max. Silicon. cme 0.20.8. Aluminum eee 0.02-0.05. Columbium wees 0.01-0.02. Vanadilm oom 0.02-0.03. Nitrogen —-——ccooomemen 0.008-0.012. Nickel meee 2.0-3.0. ION eee Essentially the balance. Nickel plus manganese —_- 3.0-3.5. hot rolling said steel into said flat steel article, with a hot roll finishing temperature below 1700° F and then subjecting said hot rolled, flat steel article to at least, but no more than, one normalizing opera- tion.
Claim 7
Independent Claim
108 words
A method for producing a hot rolled, flat steel article, said method comprising the steps of: providing a steel having the following composition in wt. percent: Carbon woe 0.05-0.10. Manganese — cee meeam 0.4-1.0. Phosphorous ——-emeeeem— 0.01 max. Sulfur wee 0.01 max. Silicon. cme 0.20.8. Aluminum eee 0.02-0.05. Columbium wees 0.01-0.02. Vanadilm oom 0.02-0.03. Nitrogen —-——ccooomemen 0.008-0.012. Nickel meee 2.0-3.0. ION eee Essentially the balance. Nickel plus manganese —_- 3.0-3.5. hot rolling said steel into said flat steel article, with a hot roll finishing temperature below 1700° F and then subjecting said hot rolled, flat steel article to at least, but no more than, one normalizing opera- tion.
Claim 8
Dependent Claim
48 words
A method as recited in Claim 5 wherein said one normalizing operation comprises heating said hot rolled, flat steel article to an article temperature above the Aj temperature for said steel composition and below 1700° F., for a time of at least one hour per inch of thickness.
Claim 9
Dependent Claim
20 words
A method as recited in Claim 5 wherein said hot rolling step comprises a finishing deformation of at least 30%.
Claim 10
Independent Claim
107 words
A method for producing a hot rolled, flat steel arti- cle, said method comprising the steps of: providing a steel having the following composition in wt. percent: Carbon ome 0.05-0.10. Manganese — ee oomam 0.4-1.0. Phosphorous een 0.01 max. Sulfur oe 0.01 max. Silicon mmm 0.2-0.8. Aluminum cee 0.02-0.05. Columbivm eee 0.01-0.02. Vanadium = 0.02-0.03. Nitrogen wooo = 0.008-0.012. Nickel ooo 2.0-3.0. Tron eee Essentially the balance. Nickel plus manganese —_— 3.0-3.5. Lo 16 hot rolling said steel into said flat steel article, with ’ a hot roll finishing temperature above 1700° F.; and then subjecting said hot rolled flat steel article to a double normalizing operation.
Claim 11
Independent Claim
107 words
A method for producing a hot rolled, flat steel arti- cle, said method comprising the steps of: providing a steel having the following composition in wt. percent: Carbon ome 0.05-0.10. Manganese — ee oomam 0.4-1.0. Phosphorous een 0.01 max. Sulfur oe 0.01 max. Silicon mmm 0.2-0.8. Aluminum cee 0.02-0.05. Columbivm eee 0.01-0.02. Vanadium = 0.02-0.03. Nitrogen wooo = 0.008-0.012. Nickel ooo 2.0-3.0. Tron eee Essentially the balance. Nickel plus manganese —_— 3.0-3.5. Lo 16 hot rolling said steel into said flat steel article, with ’ a hot roll finishing temperature above 1700° F.; and then subjecting said hot rolled flat steel article to a double normalizing operation.
Claim 12
Dependent Claim
72 words
A method as recited in Claim 8 wherein said double normalizing operation comprises: heating said hot rolled flat steel! article to an article 8 temperature above the A; temperature for said steel composition and below 1700° F., for a time of at least one hour per inch of thickness; then cooling said article until the microstructure thereof has a matrix consisting essentially of ferrite; and then repeating said first recited heating step.
Claim 13
Independent Claim
112 words
A method for producing a hot rolled, flat steel article, said method comprising the steps of: providing a steel having the following composition in wt. percent: Carbon ee. 0.05-0.10. Manganese _ o_o 0.4-1.0. Phosphorous 0.01 max. Sulfur eee 0.01 max. Silicon woe 0.2-0.8. Aluminum oo _.___ 0.02-0.05. Columbium meee 0.01-0.02. Vanadium __________._ 0.02-0.03. Nitrogen oo ___________ 0.008-0.012. Nickel 2.0-3.0. Iron ooo Essentially the balance. Nickel plus manganese —_.. 3.0-3.5. hot rolling said steel into said flat steel article, with a hot roll finishing temperature below 1700° F said hot rolling step comprising a finishing deformation less than 30%; and then subjecting said hot rolled flat steel article to a double normalizing operation.
Claim 14
Independent Claim
112 words
A method for producing a hot rolled, flat steel article, said method comprising the steps of: providing a steel having the following composition in wt. percent: Carbon ee. 0.05-0.10. Manganese _ o_o 0.4-1.0. Phosphorous 0.01 max. Sulfur eee 0.01 max. Silicon woe 0.2-0.8. Aluminum oo _.___ 0.02-0.05. Columbium meee 0.01-0.02. Vanadium __________._ 0.02-0.03. Nitrogen oo ___________ 0.008-0.012. Nickel 2.0-3.0. Iron ooo Essentially the balance. Nickel plus manganese —_.. 3.0-3.5. hot rolling said steel into said flat steel article, with a hot roll finishing temperature below 1700° F said hot rolling step comprising a finishing deformation less than 30%; and then subjecting said hot rolled flat steel article to a double normalizing operation.
Claim 15
Dependent Claim
123 words
A method as recited in Claim 10 wherein said double normalizing operation comprises: heating said hot rolled flat steel article to an article temperature above the Aj temperature for said steel composition and below 1700° F., for a time of at least one hour per inch of thickness; then cooling said article until the microstructure there- of has a matrix consisting essentially of ferrite; and then repeating said first recited heating step. References Cited UNITED STATES PATENTS 2,451,469 10/1948 Brophy etal. —_..__ 148—12 3,290,128 12/1966 Manganello et al. ___ 75—128 V 3,328,211 6/1967 Nakamura ________ 75—128 G 3,386,862 6/1968 Johnston et al. ___.____ 148—-36 3,620,717 11/1971 Sekinoetal. .___.____ 75—128 G WAYLAND W. STALLARD, Primary Examiner US. Cl XR. 75—128 G, 128 V; 148—36
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |