US1943348A - Steel for nitriding - Google Patents

Steel for nitriding Download PDF

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Publication number
US1943348A
US1943348A US556326A US55632631A US1943348A US 1943348 A US1943348 A US 1943348A US 556326 A US556326 A US 556326A US 55632631 A US55632631 A US 55632631A US 1943348 A US1943348 A US 1943348A
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United States
Prior art keywords
nitriding
steel
chromium
approximately
carbon
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Expired - Lifetime
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US556326A
Inventor
Smith Joseph Kent
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Beryllium Corp
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Beryllium Corp
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Publication date
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Priority to US556326A priority Critical patent/US1943348A/en
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Publication of US1943348A publication Critical patent/US1943348A/en
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    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals

Definitions

  • This invention relates to improved metallic compositions of ferrous base subject to nitriding. It has long been known that certain alloy steels, particularly those relatively low in carbon, when 5 subjected to the action of ammonia gas at elevated temperatures, take on a surface hardness of high magnitude. Such alloy steels have generally contained chromium and aluminum.
  • a series of steels which I have found to be particularly well adapted for nitriding purposes is the group characterized by the simultaneous presence of molybdenum and beryllium, each under 5% of the total. Such steels contain, of course, the usual steel constituents and contaminantscarbon, manganese, sulphur, etc.-and, in addition, the presence of chromium is desir-' able.
  • An example of a composition which I have found quite suitable for nitriding purposes is a steel containing the following: Percent Carbon 0.15 Chromium 1.5
  • Carbon should not exceed 0.5% in the members of this series of my invention, and chromium should not be over 3%.
  • a steel for nitriding comprising carbon approximately from 0.15% to 0.5%, chromium from 1.5% to 3.0%, manganese about 0.5%, molybdenum from about 0.5% to 5%, beryllium from about 0.35% to about 5% and the balance iron with its common contaminants.

Description

Patented Jan. 16, 1934 UNITED STATES PAT No Drawing. Application August 10, 1031 Serial No. 556,326
2 Claims. (Cl. 75-11) This invention relates to improved metallic compositions of ferrous base subject to nitriding. It has long been known that certain alloy steels, particularly those relatively low in carbon, when 5 subjected to the action of ammonia gas at elevated temperatures, take on a surface hardness of high magnitude. Such alloy steels have generally contained chromium and aluminum.
A series of steels which I have found to be particularly well adapted for nitriding purposes is the group characterized by the simultaneous presence of molybdenum and beryllium, each under 5% of the total. Such steels contain, of course, the usual steel constituents and contaminantscarbon, manganese, sulphur, etc.-and, in addition, the presence of chromium is desir-' able. An example of a composition which I have found quite suitable for nitriding purposes is a steel containing the following: Percent Carbon 0.15 Chromium 1.5
Carbon should not exceed 0.5% in the members of this series of my invention, and chromium should not be over 3%.
I claim:--
1. A steel for nitriding containing carbon approximately 0.l5%, chromium approximately 1.5%, manganese approximately 0.5%, molybdenum approximately 0.5% and beryllium approximately 0.35%, and the balance iron with its common contaminants. W
2. A steel for nitriding comprising carbon approximately from 0.15% to 0.5%, chromium from 1.5% to 3.0%, manganese about 0.5%, molybdenum from about 0.5% to 5%, beryllium from about 0.35% to about 5% and the balance iron with its common contaminants.
JOSEPH KENT SMITH.
US556326A 1931-08-10 1931-08-10 Steel for nitriding Expired - Lifetime US1943348A (en)

Priority Applications (1)

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US556326A US1943348A (en) 1931-08-10 1931-08-10 Steel for nitriding

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US556326A US1943348A (en) 1931-08-10 1931-08-10 Steel for nitriding

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