US3402756A - Process of producing high-nitrogen alloy steel - Google Patents

Process of producing high-nitrogen alloy steel Download PDF

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Publication number
US3402756A
US3402756A US451324A US45132465A US3402756A US 3402756 A US3402756 A US 3402756A US 451324 A US451324 A US 451324A US 45132465 A US45132465 A US 45132465A US 3402756 A US3402756 A US 3402756A
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nitrogen
pressure
steel
melt
producing high
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Expired - Lifetime
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US451324A
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English (en)
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Frehser Josef
Kubisch Christian
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/006—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using reactive gases
    • 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
    • C21C7/0081—Treating and handling under pressure
    • 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

  • ABSTRACT OF THE DISCLOSURE Described herein is a process of producing high-nitrogen alloy steel by preparing a steel melt sufiiciently overheated to cause it to remain molten during the succeeding steps of process. The melt is poured into a mold where it can be vacuum degassed, then nitrogen is blown into the melt to create superatmospheric pressure, and the melt is solidified in the nitrogen environment under the superatmospheric pressure.
  • Nitrogen alloy steels have the advantage that the alloying element is relatively inexpensive and improves mechanical properties.
  • the difiiculties involved in the introduction of nitrogen into the steel may be eliminated by various means.
  • the oldest and best known method of introducing nitrogen is to add high-nitrogen alloys to the molten steel. This method has the disadvantage of resulting in more or less high-alloy steels.
  • the second possibility resides in melting under pressure. In this process the steel is molten under pressure in a nitrogen atmosphere so that it is saturated with nitrogen in dependence on the gas pressure of nitrogen and on temperature. This process has the disadvantage that part of the nitrogen is liberated when the steel is being poured. The casting operation involves a considerable loss of nitrogen and results in a porous ingot.
  • the present invention relates to a process of producing nitrogen alloy steels in a pressure vessel, which has the strength and pressure resistance required for the pressure to be maintained therein and consists of a pressure-resisting steel body, in which an ingot mold having a refractory lining is placed, into which the steel, in which nitrogen is to be incorporated, is poured in a slightly overheated state.
  • the vessel is then pressure-tightly closed 3,402,756 Patented Sept. 24, 1968 ice and outgassed by a vacuum.
  • nitrogen is blown in by a lance or a tuyere bottom or a porous bottom block of the ingot mold itself at a pressure which depends on the amount of nitrogen to be incorporated.
  • the steel which has been pressurized or charged with pressure gas, must solidify under the desired, set pressure. In this way the theoretically calculated nitrogen values can be approximately attained.
  • the drawing schematically shows the process of producing high-nitrogen alloy steels.
  • Pure iron would be saturated with nitrogen in an amount of 0.215% under a pressure of 25 kg./sq. cm. superatmospheric pressure and at 1600 C.
  • the solubility of nitrogen is highly increased, however, by the elements manganese, silicon, chromium and vanadium. It is possible without difficulty by means of this pressure casting process to introduce nitrogen to a content of 0.8% into a steel which contains, e.g., 0.3% carbon, 0.3% silicon, 18% manganese, 15% chromium and 2% nickel at the relatively low pressure of 25 kg./ sq. cm.
  • the superatmospheric nitrogen pressure may be released through a plant for regenerating nitrogen. After this release, the pressure vessel is opened, the ingot mold is lifted by a crane and the ingot is stripped in known manner. The stripped ingot may be subjected to any further processing in accordance with its intended use.
  • This process of incorporating nitrogen may also be carried out without preceding outgassing by a vacuum treatment.
  • a process of producing high-nitrogen alloy steel which comprises the steps of preparing a steel melt, pouring said melt in a slightly overheated state into an ingot mold contained in a chamber, then introducing nitrogen into said mold through said melt, obtaining superatmospheric pressure in the chamber by said introduced nitrogen so as to saturate said melt with the desired percentage of nitrogen, and then solidifying said melt in said mold under said pressure.

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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)
  • Manufacture And Refinement Of Metals (AREA)
US451324A 1964-05-12 1965-04-27 Process of producing high-nitrogen alloy steel Expired - Lifetime US3402756A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT412964A AT274877B (de) 1964-05-12 1964-05-12 Verfahren zur Herstellung von hoch stickstofflegiertem Stahl

Publications (1)

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US3402756A true US3402756A (en) 1968-09-24

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US451324A Expired - Lifetime US3402756A (en) 1964-05-12 1965-04-27 Process of producing high-nitrogen alloy steel

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US (1) US3402756A (de)
AT (1) AT274877B (de)
BE (1) BE663812A (de)
DE (1) DE1458820A1 (de)
GB (1) GB1097912A (de)
SE (1) SE308733B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3650313A (en) * 1968-10-09 1972-03-21 Inst Po Metalloznanie I Tekno Method for the production of castings from alloys of metals and gases
US4081270A (en) * 1977-04-11 1978-03-28 Union Carbide Corporation Renitrogenation of basic-oxygen steels during decarburization
US5887646A (en) * 1997-01-16 1999-03-30 Ford Global Technologies, Inc. Modular sand mold system for metal treatment and casting
CN103484746A (zh) * 2013-09-17 2014-01-01 长春工业大学 一种重熔高强度不锈钢的方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1282161A (en) * 1968-07-04 1972-07-19 Nippon Kokan Kk A method of making a high nitrogen steel

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US419032A (en) * 1890-01-07 Method of welding by electricity
US1888132A (en) * 1930-10-27 1932-11-15 Electro Metallurg Co Method of casting steel ingots
US2021979A (en) * 1933-07-20 1935-11-26 Rustless Iron Corp Of America Production of rustless iron
FR957046A (de) * 1950-02-13
US2696433A (en) * 1951-01-11 1954-12-07 Armco Steel Corp Production of high nitrogen manganese alloy
US2745740A (en) * 1954-09-02 1956-05-15 Ford Motor Co Process of preparing an iron base melt
US2826494A (en) * 1955-12-27 1958-03-11 Ohio Commw Eng Co Process for making alloys
FR1188658A (fr) * 1957-12-03 1959-09-24 U C P M I Procédé de brassage des aciers en cours de solidification
US2975047A (en) * 1956-11-07 1961-03-14 Siderurgie Fse Inst Rech Process for the continuous pre-refining of molten pig iron
US3116998A (en) * 1959-12-31 1964-01-07 Light Metals Res Lab Inc Continuous vacuum and inert gas process for treating titanium and other metals

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US419032A (en) * 1890-01-07 Method of welding by electricity
FR957046A (de) * 1950-02-13
US1888132A (en) * 1930-10-27 1932-11-15 Electro Metallurg Co Method of casting steel ingots
US2021979A (en) * 1933-07-20 1935-11-26 Rustless Iron Corp Of America Production of rustless iron
US2696433A (en) * 1951-01-11 1954-12-07 Armco Steel Corp Production of high nitrogen manganese alloy
US2745740A (en) * 1954-09-02 1956-05-15 Ford Motor Co Process of preparing an iron base melt
US2826494A (en) * 1955-12-27 1958-03-11 Ohio Commw Eng Co Process for making alloys
US2975047A (en) * 1956-11-07 1961-03-14 Siderurgie Fse Inst Rech Process for the continuous pre-refining of molten pig iron
FR1188658A (fr) * 1957-12-03 1959-09-24 U C P M I Procédé de brassage des aciers en cours de solidification
US3116998A (en) * 1959-12-31 1964-01-07 Light Metals Res Lab Inc Continuous vacuum and inert gas process for treating titanium and other metals

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3650313A (en) * 1968-10-09 1972-03-21 Inst Po Metalloznanie I Tekno Method for the production of castings from alloys of metals and gases
US4081270A (en) * 1977-04-11 1978-03-28 Union Carbide Corporation Renitrogenation of basic-oxygen steels during decarburization
US5887646A (en) * 1997-01-16 1999-03-30 Ford Global Technologies, Inc. Modular sand mold system for metal treatment and casting
CN103484746A (zh) * 2013-09-17 2014-01-01 长春工业大学 一种重熔高强度不锈钢的方法
CN103484746B (zh) * 2013-09-17 2016-06-15 长春工业大学 一种重熔高强度不锈钢的方法

Also Published As

Publication number Publication date
DE1458820A1 (de) 1969-01-30
SE308733B (de) 1969-02-24
BE663812A (de) 1965-09-01
GB1097912A (en) 1968-01-03
AT274877B (de) 1969-10-10

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