US1838195A - Method of nitriding steel articles - Google Patents
Method of nitriding steel articles Download PDFInfo
- Publication number
- US1838195A US1838195A US391561A US39156129A US1838195A US 1838195 A US1838195 A US 1838195A US 391561 A US391561 A US 391561A US 39156129 A US39156129 A US 39156129A US 1838195 A US1838195 A US 1838195A
- Authority
- US
- United States
- Prior art keywords
- nitriding
- hours
- temperature
- articles
- steel articles
- Prior art date
- 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
Links
Images
Classifications
-
- 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 in general to the intriding of alloy steel articles and more particularly to a novel method of nitriding such articles, whereby the time of nitriding is materially lessened Without at the same time decreasing the surface hardness of the nitrided zone thereof.
- the nitrided zones have been found to be extremely hard, the zones are relatively thin and the time required is often as much as 100 hours.
- the specimens, designated A were nitrided at a temperature of 950 F. for 15 hours and then at a temperature of 1180 F. for 15 hours.
- Claims 1 The method of nitriding alloy steel articles which consists in nitriding the articles at a temperature of from about 850 F. to about 1000 F. for from about 5 to about 40 hours, and then at a temperature of from about 1100 F. to about 1250 F. for from about 5 to about 40 hours.
- nitriding alloy steel articles which consists in nitriding the articles at a temperature of'about 950 F. for about 15 hours, and then at a temperature of about 1180 F. for about 15 hours.
Description
Dec.. 29, 1931. R. SERGESON 1,333,195
7 METHOD OF NITRIDING STEEL ARTICLES Filed Sept. 10, 1929 l,
VI CR5! a HARDIIL'SS NUMBER .o 1 .o .DIa'rAHcr 8:4 ow Sump-Ac:
gwventoz Eobert Seryeson Patented Dec. 29, 1931 UNITED STATES PATENT OFFICE ROBERT SERGESON, OF MASSILLON, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO BE- PUBLIC STEEL 'CORPORATION, OF YOUNGSTOWN, OHIO, A CORPORATION OF NEW JERSEY METHOD OF NITRIDING- STEEL ARTICLES Application filed September 10, 1929. Serial No. 891,561.
This invention relates in general to the intriding of alloy steel articles and more particularly to a novel method of nitriding such articles, whereby the time of nitriding is materially lessened Without at the same time decreasing the surface hardness of the nitrided zone thereof.
According to Fry, a well-known investigator of the nitriding process, no nitriding should be done at a temperature in excess of 1075 'F., else the marginal layers of the nitrided zone will be brittle and tend to peel off. For this reason, most nitriding has heretofore been done below 1000 F., and while,
,- in most instances, the nitrided zones have been found to be extremely hard, the zones are relatively thin and the time required is often as much as 100 hours.
It has been proposed to decrease the time required for nitriding by nitriding at temperatures above 1000 F. and up to as high as 1250 F. Increasing the temperature of nitriding in this manner, while it results in a material lessening of the time required for producing a nitrided zone, results also in a decrease in surface hardness of such zone. It has been proposed to decrease the time required for nitriding without sacrificing surface hardness by employing a duplex heating cycle in which the nitriding is conducted at a relatively high temperature for a certain number of hours and then at a relatively low temperature for a like or different number of hours. This method results in only a slight increase in surface hardness.
As the result of a series of experiments, I have found that by reversing the sequence of temperatures in the aforesaid duplex heating cycle, i. e., by nitriding at a relatively low temperature for a certain number of hours and then at a relatively high temperature for a like or different number of hours, the surface'hardness of the nitrided zone is increased to. a degree comparable with that of articles nitrided at comparatively low temperatures for long periods, and at the same time, the toughness of the nitrided zone is increased so that it is enabled to withstand greater deformations without peeling, chipping or spalling thereof.
I attain these results by nitriding the articles at a temperature of from about 850 F. to about 1000 F. for a period varying from about 5 to about 40 hours, and then at a temperature of from about 1100 F. to about 1250 F. for a period varying from about 5 to about 40 hours.
As an example of my novel method of nitriding, attention is directed to the curves shown in the accompanying drawing, wherein the effects of nitriding by the two aforesaid duplex heating cycles are clearly shown.
The specimens employed in obtaining the data for these curves, were identical in size, sha e and composition, their analysis being as ollows:
Per cent Carbon 315 Molybdenum -Q 19 Silicon 15 Chronium 1. 68 Manganese 63 Aluminum 70 The specimens, designated B were nitrided at a temperature of 11-80 F. for 15 hours and then at a temperature of 950 F. for 15 hours.
- The specimens, designated A were nitrided at a temperature of 950 F. for 15 hours and then at a temperature of 1180 F. for 15 hours.
The curves, which represent the averages of the values obtained for hardness, clearly show that the surface hardness of the specimens designated A is considerably higher than that of the specimens designated B and that the hardness values for depths up to .015 in. are higher than those of the latter specimens.
Claims 1. The method of nitriding alloy steel articles which consists in nitriding the articles at a temperature of from about 850 F. to about 1000 F. for from about 5 to about 40 hours, and then at a temperature of from about 1100 F. to about 1250 F. for from about 5 to about 40 hours.
2. The method of nitriding alloy steel articles which consists in nitriding the articles at a temperature of'about 950 F. for about 15 hours, and then at a temperature of about 1180 F. for about 15 hours.
' In testimony whereof I aifix my signature.
ROBERT SERGESON.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US391561A US1838195A (en) | 1929-09-10 | 1929-09-10 | Method of nitriding steel articles |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US391561A US1838195A (en) | 1929-09-10 | 1929-09-10 | Method of nitriding steel articles |
Publications (1)
Publication Number | Publication Date |
---|---|
US1838195A true US1838195A (en) | 1931-12-29 |
Family
ID=23547090
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US391561A Expired - Lifetime US1838195A (en) | 1929-09-10 | 1929-09-10 | Method of nitriding steel articles |
Country Status (1)
Country | Link |
---|---|
US (1) | US1838195A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4264380A (en) * | 1979-11-16 | 1981-04-28 | General Electric Company | Nitride casehardening process and the nitrided product thereof |
US20050045850A1 (en) * | 2003-08-25 | 2005-03-03 | Ulicny John C. | Oxidation-resistant magnetorheological fluid |
-
1929
- 1929-09-10 US US391561A patent/US1838195A/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4264380A (en) * | 1979-11-16 | 1981-04-28 | General Electric Company | Nitride casehardening process and the nitrided product thereof |
US20050045850A1 (en) * | 2003-08-25 | 2005-03-03 | Ulicny John C. | Oxidation-resistant magnetorheological fluid |
US6929757B2 (en) * | 2003-08-25 | 2005-08-16 | General Motors Corporation | Oxidation-resistant magnetorheological fluid |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US1924099A (en) | Thermally hardening steel | |
US1838195A (en) | Method of nitriding steel articles | |
US3333987A (en) | Carbon-stabilized steel products and method of making the same | |
US2266481A (en) | Age hardenable, low expansion, nickel-iron-titanium alloy | |
CA1042771A (en) | Method of quenching zirconium and alloys thereof | |
CN105385958A (en) | Dual-phase anti-corrosion stainless steel and corrosion resistance optimizing treatment process thereof | |
US2527287A (en) | Hardening of austenitic chromiumnickel steels by working at subzero temperatures | |
US2299138A (en) | Heat treating of steel | |
US3042555A (en) | Impact resistant aluminum alloy plate | |
CN104775089A (en) | Rapid salt-bath nitridation method by applying magnetic field | |
JPS5822329A (en) | Production of austenitic stainless steel sheet and strip | |
US2813788A (en) | Nickel-chromium-iron heat resisting alloys | |
CN105821343B (en) | A kind of production method of special steel | |
GB1189696A (en) | Improvements in or relating to Methods of Improving the Magnetic Properties of Steels for Magnetic Applications, and Products thus Obtained | |
US2103610A (en) | Alloy steels | |
US1723922A (en) | Copper cobalt alloy | |
SU863673A1 (en) | Method of thermal treatment of carbon austenite steels | |
US1804176A (en) | Process of surface-hardening steel | |
US2528216A (en) | Selective grain growth of silicon steel | |
US1924344A (en) | Surface hardened cast iron article of manufacture | |
US1774999A (en) | Method of heat treating nitrided articles | |
US2288999A (en) | Gear production | |
ES394222A1 (en) | Ferrous alloys | |
US2325044A (en) | Manganese alloys | |
US1545127A (en) | Method of producing copper-coated metallic articles |