US3208844A - Process for producing a low-temperature tough steel - Google Patents

Process for producing a low-temperature tough steel Download PDF

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Publication number
US3208844A
US3208844A US214516A US21451662A US3208844A US 3208844 A US3208844 A US 3208844A US 214516 A US214516 A US 214516A US 21451662 A US21451662 A US 21451662A US 3208844 A US3208844 A US 3208844A
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US
United States
Prior art keywords
steel
molten steel
nitrogen
low
degassifying
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US214516A
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English (en)
Inventor
Kato Takeshi
Matsuda Kamematsu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yawata Iron and Steel Co Ltd
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Yawata Iron and Steel Co Ltd
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Publication date
Application filed by Yawata Iron and Steel Co Ltd filed Critical Yawata Iron and Steel Co Ltd
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N

Definitions

  • This invention relates .to processes for producing a steel having a good-weldability and a high toughness at alow temperature.
  • transition temperature In order that a steel may be tough at a low temperature, its transition temperature must be low enough for the using condition. Such transition temperature is a criterion for judging the low-temperature brittleness of a steel but it is remarkably affected by the chemical composition, producing process, and thermal hysteresis of the steel.
  • Carbon has the greatest effect among the chemical components. With the increase of the carbon content, the transition temperature will increase. Phosphorus and nitrogen together will increase the transition temperature. Manganese is an effective component.
  • nitrogen is removed only slightly. This is because the nitrogen content in the molten steel is of a value (of not more than about 0.008%) near the balanced solubility under a pressure of l to 40 mm. Hg in degassing. If the nitrogen content is made higher than about 0.008% and the molten steel denitrified under a 3,208,844 Patented Sept. 28, 1965 pressure of not more than 40 mm. Hg, this results in promoting an ardent foaming phenomenon within the vacuum vessel and serves to increase the surface area of the molten steel in the vacuum. In this manner the C0 reaction and therefore deoxidation will be accelerated. On the other hand, the nitrogen content after the refinement in vacuum will be reduced to near the amount as of before the addition. But the necessary amount of nitrogen will remain to obtain a steel having excellent toughness at low temperature.
  • the present invention has succeeded in obtaining a steel of a very low oxygen content by accelerating deoxidiza tion by utilizing the above-described phenomenon, and separating residual nitrogen as aluminum nitride.
  • nitrogen may be added in .the state of gaseous nitrogen or as a nitrogen alloy.
  • the thus adjusted molten steel is to be degassed in a vacuum.
  • a method wherein'a part of molten steel in a ladle is successively sucked into a vacuum vessel, remains therein for a short time and is returned to the ladle.
  • any desired alloying elements may be added to the molten steel vacuum-degassed according to the present invention so that the composition may preferably be not more than 0.15 C., 0.01 .to 0.10% Al, 0.5 to 2.0% Mn, 0.01 to 1.0% Si and, as required, a total of 0.01 to 0.02% of one or more of Nb, Ta and V.
  • the composition may preferably be not more than 0.15 C., 0.01 .to 0.10% Al, 0.5 to 2.0% Mn, 0.01 to 1.0% Si and, as required, a total of 0.01 to 0.02% of one or more of Nb, Ta and V.
  • the nitrogen content in the molten steel as refined in an open hearth furnace or the like is adjusted to be between about 0.008 to 0.04%, at the same time the ratio of C/O in the molten steel is adjusted to be about 3/4 by adding such adjusting agent as a deoxidizing agent or a carburizing agent. Said molten steel is then degassed in a vacuum whereby carbon and oxygen contents will be reduced to an extreme low.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
US214516A 1961-08-12 1962-08-03 Process for producing a low-temperature tough steel Expired - Lifetime US3208844A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2920461 1961-08-12

Publications (1)

Publication Number Publication Date
US3208844A true US3208844A (en) 1965-09-28

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ID=12269647

Family Applications (1)

Application Number Title Priority Date Filing Date
US214516A Expired - Lifetime US3208844A (en) 1961-08-12 1962-08-03 Process for producing a low-temperature tough steel

Country Status (5)

Country Link
US (1) US3208844A (de)
AT (1) AT258990B (de)
DE (1) DE1433690A1 (de)
GB (1) GB1013190A (de)
LU (1) LU42194A1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3459537A (en) * 1966-08-25 1969-08-05 United States Steel Corp Continuously cast steel slabs and method of making same
US3512957A (en) * 1963-08-10 1970-05-19 Hoerder Huettenunion Ag Steelmaking processes
US3792999A (en) * 1971-02-05 1974-02-19 Hoerder Huettenunion Ag Method of producing a drawing and deep drawing steel resistant to ageing, particularly for single-coat enamelling
US3822735A (en) * 1969-07-11 1974-07-09 Nat Steel Corp Process for casting molten silicon-aluminum killed steel continuously
US10920309B2 (en) 2014-08-27 2021-02-16 Thyssenkrupp Rasselstein Gmbh Method for producing a nitrided packaging steel

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4619714A (en) * 1984-08-06 1986-10-28 The Regents Of The University Of California Controlled rolling process for dual phase steels and application to rod, wire, sheet and other shapes
DE102014116929B3 (de) 2014-11-19 2015-11-05 Thyssenkrupp Ag Verfahren zur Herstellung eines aufgestickten Verpackungsstahls, kaltgewalztes Stahlflachprodukt und Vorrichtung zum rekristallisierenden Glühen und Aufsticken eines Stahlflachprodukts

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2068785A (en) * 1933-11-20 1937-01-26 United States Steel Corp Method of manufacturing low carbon steel
US2564498A (en) * 1949-08-26 1951-08-14 Gen Electric Preparation of alloys
US2714065A (en) * 1951-11-21 1955-07-26 Bethlehem Steel Corp Method of producing machining steel
US2755181A (en) * 1952-10-09 1956-07-17 Air Liquide Process of introducing boron into ferrous metal
US2815273A (en) * 1953-10-02 1957-12-03 Nat Res Corp Process for producing stainless steel and alloy thereof
US2865736A (en) * 1956-02-08 1958-12-23 Carpenter Steel Co Method of alloying gaseous materials with metals
US2893860A (en) * 1957-02-21 1959-07-07 Heraeus Gmbh W C Method and apparatus for continuously degassing molten metals, particularly steel, by evacuation
US2993780A (en) * 1957-11-16 1961-07-25 Siderurgie Fse Inst Rech Method for treating steel in vacuo

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2068785A (en) * 1933-11-20 1937-01-26 United States Steel Corp Method of manufacturing low carbon steel
US2564498A (en) * 1949-08-26 1951-08-14 Gen Electric Preparation of alloys
US2714065A (en) * 1951-11-21 1955-07-26 Bethlehem Steel Corp Method of producing machining steel
US2755181A (en) * 1952-10-09 1956-07-17 Air Liquide Process of introducing boron into ferrous metal
US2815273A (en) * 1953-10-02 1957-12-03 Nat Res Corp Process for producing stainless steel and alloy thereof
US2865736A (en) * 1956-02-08 1958-12-23 Carpenter Steel Co Method of alloying gaseous materials with metals
US2893860A (en) * 1957-02-21 1959-07-07 Heraeus Gmbh W C Method and apparatus for continuously degassing molten metals, particularly steel, by evacuation
US2993780A (en) * 1957-11-16 1961-07-25 Siderurgie Fse Inst Rech Method for treating steel in vacuo

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3512957A (en) * 1963-08-10 1970-05-19 Hoerder Huettenunion Ag Steelmaking processes
US3459537A (en) * 1966-08-25 1969-08-05 United States Steel Corp Continuously cast steel slabs and method of making same
US3822735A (en) * 1969-07-11 1974-07-09 Nat Steel Corp Process for casting molten silicon-aluminum killed steel continuously
US3792999A (en) * 1971-02-05 1974-02-19 Hoerder Huettenunion Ag Method of producing a drawing and deep drawing steel resistant to ageing, particularly for single-coat enamelling
US10920309B2 (en) 2014-08-27 2021-02-16 Thyssenkrupp Rasselstein Gmbh Method for producing a nitrided packaging steel

Also Published As

Publication number Publication date
LU42194A1 (de) 1962-10-09
AT258990B (de) 1967-12-27
GB1013190A (en) 1965-12-15
DE1433690A1 (de) 1968-12-05

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