US2531731A - Razor blade stock - Google Patents
Razor blade stock Download PDFInfo
- Publication number
- US2531731A US2531731A US16883A US1688348A US2531731A US 2531731 A US2531731 A US 2531731A US 16883 A US16883 A US 16883A US 1688348 A US1688348 A US 1688348A US 2531731 A US2531731 A US 2531731A
- Authority
- US
- United States
- Prior art keywords
- strip
- steel
- razor blade
- blade stock
- stock
- 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
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- 229910052799 carbon Inorganic materials 0.000 claims description 12
- 229910001327 Rimmed steel Inorganic materials 0.000 claims description 4
- 229920000297 Rayon Polymers 0.000 claims 1
- 239000002964 rayon Substances 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- 238000007796 conventional method Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000000137 annealing Methods 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910001567 cementite Inorganic materials 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 229910000617 Mangalloy Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910052752 metalloid Inorganic materials 0.000 description 1
- 150000002738 metalloids Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/18—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for knives, scythes, scissors, or like hand cutting tools
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Description
Patented Nov. 28, 1950 UNITED STATES PATENT OFFICE to Carnegie-Illinois Steel Corporation, a corporation of New Jersey No Drawing. ih-iginal application November 29,
1946, Serial No. 713,098. Divided and this application March 24, 1948, Serial No. 16,883
3 Claims. 1
This invention relates to improved razor blade stock and the method of producing the same. This application is a division of my copending application Serial No. 713,098, filed November 29, 1946.
Razor blade stock is conventionally produced from high carbon steel by hot rolling in strip form to about .080" gauge and subsequently cold reducing the same to the desired .006" gauge. The steel used is a high grade, electric furnace or open hearth alloy grade ordinarily containing about 1.25% carbon, .18 to 33% silicon, and .20 to .40% chromium. Due to the hardness of such steel, about six cold-rolling operations with intermediate anneals between each operation are necessary to obtain the reduction to final gauge. Such processing adds materially to the cost of the steel, and considerable rejects due to poor surface and non-metallic inclusions further add to the cost. Furthermore, the decarburization is somewhat of a problem in conventional method due to number of anneals given high carbon strip, but causes no problem in the method of my invention where strip is carburized.
It is accordingly an object of the present invention to provide a method of efficiently producing razor blade stock.
It is a further object of the present invention to produce razor blade stock characterized by a clean and uniform surface and freedom from nonmetallic inclusions.
The foregoing and further objects will be apparent from the following detailed description.
In accordance with the principles of my invention, steel strip containing 25% maximum carbon, 50% maximum manganese, .O4% maximum phosphorus, .05% maximum sulphur, 20% maximum silicon, .03% maximum aluminum, is hot rolled to a suitable gauge, for example, .680. The strip is then pickled to remove any scale and then cold reduced to the desired gauge of about .006". Due to the softness of this low carbon and low manganese steel, it can be reduced without intermediate annealing in one or at most two cold-rolling operations.
Following the cold reduction, the strip is continuously gas carburized to increase the carbon content throughout its cross section to between 1.00 and 1.50% carbon and preferably about 1.25%. Due to the thinness of the strip, it can be effectively and continuously carburized at a suitable temperature, such as 1650 F., in any of the commercial fuel gases containing carbon monoxide and the hydrocarbons such as methane, ethane and propane.
In the conventional method for producing razor blade stock from high carbon strip, the
duction. The intermediate anneals are essential to facilitate cold reduction of this high carbon grade; the final anneal relieves the hardness induced by the last cold-rolling operation. As a result of these anneals, the finished stock possesses a spheroidized structure.
One step in the manufacture of blades from such stock consists of austenitizing the strip at a temperature between the upper (Acm) and lower (A1) critical temperatures, for example 1450" F., followed by quenching between water-cooled plates. Since the austenitizing temperature is not high enough to dissolve all the carbides, the structure of the finished blade is a mixture of spheroidized cementite in a martensitic matrix. Such a structure is felt to be desirable from a cutting and wearing standpoint.
In the present invention, several alternatives are available after the .006" gauge strip has been carburized through its cross section. It has been demonstrated that the carburized strip in the pearlitic condition can be austenitized and quenched as in the conventional method, and a structure of fine cementite spheres in a martensitic matrix will be produced. This structure would appear to be as suitable as the one being obtained by the conventional method and consequently no annealing of the carburized strip is necessary.
However, if a spheroidized razor blade stock is desired, this may be obtained by controlled cooling of the carburized strip from the carburizing temperature. As an alternative to this, the carburized strip may be cooled to room tempera ture, then given a short, super-critical anneal to produce aspheroidized structure. Another method which may be employed is to cold roll to about .010" gauge, carburize the strip, cold roll to .006 gauge, and spheroidize with a sub-critical anneal.
Preferably the strip is formed from low carbon rimmed steel. The relatively high carbon silicon killed steel conventionally used, or fine grain aluminum killed low carbon steel are unsatisfactory due to the large number of metalloid inclusions therein. These inclusions result in frequent tear-outs on the edge of the blades during sharpening. Also the surface of such steels tends to be poor. However, in rimmed steels the ingot surface is characterized by freedom from inclusions and blowholes. Further processing does not destroy this skin or layer of purer metal and the same remains intact to produce razor blade stock having fine surface characteristics.
It will be noted that chromium which is required in conventional stock, primarily to prevent graphitization during annealing is not necessary in my improved stock. This results in a considerable saving in alloy cost.
While I have described several specific embodiments of my invention, it will be understood that these embodiments are merely for the purpose of illustration and description and that various other forms may be devised within the scope of my invention, as defined in the appended claims.
I claim:
1. As an article of manufacture, razor blade stock consisting of a steel strip formed of recarburized rimmed steel and having a carbon content of at least 1.00% throughout its thickness.
2. As an article of manufacture, razor blade stock consisting of a steel strip formed of recarburized rimmed steel, said stock having a carbon content of at least 1.00% throughout its thickness, said strip being characterized by a surface substantially free from inclusions and blowholes.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 90,313 Shaw May 18, 1869 361,620 Dunn Apr. 19, 1887 OTHER REFERENCES The Making, Shaping and Treating of Steel, by Camp and Francis, 5th ed. page 654. Published by Carnegie-I11. Steel Corp., 1940.
Claims (1)
1. AS AN ARTICLE OF MANUFACUTER, RAYON BLADE STOCK CONSISTING OF A STEEL STRIP FROMED OF RECARBURIZED RIMMED STEEL AND HAVING A CARBON CONTENT OF AT LEAST 1.00% THROUGHOUT ITS THICKNESS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US16883A US2531731A (en) | 1946-11-29 | 1948-03-24 | Razor blade stock |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US71309846A | 1946-11-29 | 1946-11-29 | |
| US16883A US2531731A (en) | 1946-11-29 | 1948-03-24 | Razor blade stock |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2531731A true US2531731A (en) | 1950-11-28 |
Family
ID=26689181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US16883A Expired - Lifetime US2531731A (en) | 1946-11-29 | 1948-03-24 | Razor blade stock |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2531731A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2881109A (en) * | 1956-10-22 | 1959-04-07 | Lasalle Steel Co | Case-hardened, worked steels |
| US2915424A (en) * | 1952-11-05 | 1959-12-01 | Lyon George Albert | Method of making cartridge cases and like articles |
| US2987429A (en) * | 1958-01-07 | 1961-06-06 | United States Steel Corp | High-carbon razor blade stock and the like |
| US3009843A (en) * | 1956-10-22 | 1961-11-21 | Lasalle Steel Co | Steel products and method for producing same |
| US3313660A (en) * | 1963-07-15 | 1967-04-11 | Crucible Steel Co America | Cutting articles and stock therefor and methods of making the same |
| US3499803A (en) * | 1967-02-13 | 1970-03-10 | United States Steel Corp | Method of treating stainless steel |
| US3501334A (en) * | 1966-03-16 | 1970-03-17 | Gillette Co | Razor blades |
| US3873375A (en) * | 1973-04-19 | 1975-03-25 | Remington Arms Co Inc | Method of making steel cartridge cases |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US90313A (en) * | 1869-05-18 | Improved process of converting wrought-iron, wire ribbon, and plates | ||
| US361620A (en) * | 1887-04-19 | Manufacture of table cutleey |
-
1948
- 1948-03-24 US US16883A patent/US2531731A/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US90313A (en) * | 1869-05-18 | Improved process of converting wrought-iron, wire ribbon, and plates | ||
| US361620A (en) * | 1887-04-19 | Manufacture of table cutleey |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2915424A (en) * | 1952-11-05 | 1959-12-01 | Lyon George Albert | Method of making cartridge cases and like articles |
| US2881109A (en) * | 1956-10-22 | 1959-04-07 | Lasalle Steel Co | Case-hardened, worked steels |
| US3009843A (en) * | 1956-10-22 | 1961-11-21 | Lasalle Steel Co | Steel products and method for producing same |
| US2987429A (en) * | 1958-01-07 | 1961-06-06 | United States Steel Corp | High-carbon razor blade stock and the like |
| US3313660A (en) * | 1963-07-15 | 1967-04-11 | Crucible Steel Co America | Cutting articles and stock therefor and methods of making the same |
| US3501334A (en) * | 1966-03-16 | 1970-03-17 | Gillette Co | Razor blades |
| US3499803A (en) * | 1967-02-13 | 1970-03-10 | United States Steel Corp | Method of treating stainless steel |
| US3873375A (en) * | 1973-04-19 | 1975-03-25 | Remington Arms Co Inc | Method of making steel cartridge cases |
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