US1359851A - Treating high-speed steel - Google Patents
Treating high-speed steel Download PDFInfo
- Publication number
- US1359851A US1359851A US314968A US31496819A US1359851A US 1359851 A US1359851 A US 1359851A US 314968 A US314968 A US 314968A US 31496819 A US31496819 A US 31496819A US 1359851 A US1359851 A US 1359851A
- Authority
- US
- United States
- Prior art keywords
- steel
- speed steel
- temperature
- tool
- treating high
- 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
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Classifications
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/607—Molten salts
Definitions
- the present invention relates to the heat treatment of high speed alloy steel and particularly to the quenching of steel after 'having been heated to a high. temperature in order to harden and temper the same.
- High speed steel as distinguished from nickel steel, or carbon steel, is characterized by a high tungsten content.
- a typical high speed steel contains besides iron the following: tungsten 13 to 15%; chromium 3.5
- the tool to be hardened is first slowly preheated to about 850 C. in any convenient way, say,
- the tool has reached the temperature of 1275 to 1300 C. it is.
- the high speed steel tool has attained the temperature of this quenching bath, it is removed and allowed to cool in the air. If desired, the hardened tool may be subsequently heated or drawn to remove strains in the usual manner.
- the method of quenching alloy steel which consists in heating the steel to atemperature of about 1275 to 1300 C. and then reducing the temperature of said steel to about 600 to 650 C. by contact with a bath of fused salts.
- LA quenching bath for high speed steel consisting of the chlorids of potassium
- a quenching bath for high speed steel consisting of the chlorids ofpotassium, sodium, calcium and barium inequal proportions by weight.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Description
UNITED STATES PATENT OFFICE.
CLARENCE A.
WHITMYRE, or SCHEZN'ECTADY, NEW YORK, ASSIGNOR T0 GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.
TREATING HIGH-SPEED STEEL.
No Drawing. I
To all whom it may concern:
Be itknown that I, CLARENCE A. WHIT- MYBE, a citizen of the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and useful Improvements in Treating High-Speed Steel, of which the followlng is a specification.
The present invention relates to the heat treatment of high speed alloy steel and particularly to the quenching of steel after 'having been heated to a high. temperature in order to harden and temper the same.
It is the object of my invention to avoid.
cracks in the hardened steel and to improve the quality of the steel.
Prior to my 1nvent1on it has been customary to heat cutters andsimilar high speed steel tools to a high temperature and then cooling from 1300 C. toroom temperature.
High speed steel, as distinguished from nickel steel, or carbon steel, is characterized by a high tungsten content. A typical high speed steel contains besides iron the following: tungsten 13 to 15%; chromium 3.5
to 4.25%; carbon .55 to .70%; vanadium 1%; silicon 15 to 21%; manganese .20 to 40%; sulfur and'phosphorus being kept negligibly low.
When carrying out my invention the tool to be hardened is first slowly preheated to about 850 C. in any convenient way, say,
for example, in an oil, gas or electric furnace in the usual well understood manner. The tool is then heated from 850 C; as
. rapidly as is desired to 1300 C. in any'suite furnace. When maintained at this temperature range, may
Specification of Letters Patent.
the tool has reached the temperature of 1275 to 1300 C. it is.
- Patented Nov. 23, 1920.
7 Application filed August 2,1919. Serial No. 314,968.
be used, but I prefer to employ a bath consisting of the chlorids of potassium, sodium, calcium and barium used in equal proportions by weight. When the high speed steel tool has attained the temperature of this quenching bath, it is removed and allowed to cool in the air. If desired, the hardened tool may be subsequently heated or drawn to remove strains in the usual manner.
' What I claim as new and desire to secure by Letters Patent of the United States, is,- 1. The method of hardening high speed steel which consists in heating the steel to a temperature of about 1275 to 1300 C. and then quenching the same at temperature of about GOO-650 C.
2. The method of quenching alloy steel which consists in heating the steel to atemperature of about 1275 to 1300 C. and then reducing the temperature of said steel to about 600 to 650 C. by contact with a bath of fused salts.
3. The method of hardening tungsten steel which consists in'heating steel to a temperature of about 127 5 to 1300 C. and
then quenching the heated steel by contact with a bath of molten chlorids of potassium, sodium, calcium and barium in equal proportions by weight, said bath being heated to a temperature of about 600- 650 C.
LA quenching bath for high speed steel consisting of the chlorids of potassium,
. sodium, calcium and barium in proportionsv adapted to cause said ba-th' to be liquid at.
about 600 to 650 C.
5. A quenching bath for high speed steel consisting of the chlorids ofpotassium, sodium, calcium and barium inequal proportions by weight.
6. The method of hardening steel tools containing at least about 13% tungsten, which consists in slowly heating. said tools to about 850 0., then rapidly :raising the temperature of said tool to about 1300 C., thereupon quenching the heated tool in a bath of fused salts maintained at a temperature of about 600 to 650 C. and finally permitting' said tool to cool in the air.
In witness whereof, I have hereunto set my'hand this 1st day of August, 1919.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US314968A US1359851A (en) | 1919-08-02 | 1919-08-02 | Treating high-speed steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US314968A US1359851A (en) | 1919-08-02 | 1919-08-02 | Treating high-speed steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1359851A true US1359851A (en) | 1920-11-23 |
Family
ID=23222265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US314968A Expired - Lifetime US1359851A (en) | 1919-08-02 | 1919-08-02 | Treating high-speed steel |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1359851A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2497538A (en) * | 1946-08-29 | 1950-02-14 | Magnesium Elektron Ltd | Fluxes for use in the treatment of light metals |
| US2716989A (en) * | 1950-06-05 | 1955-09-06 | Holcroft & Co | Apparatus for treating metal parts |
-
1919
- 1919-08-02 US US314968A patent/US1359851A/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2497538A (en) * | 1946-08-29 | 1950-02-14 | Magnesium Elektron Ltd | Fluxes for use in the treatment of light metals |
| US2716989A (en) * | 1950-06-05 | 1955-09-06 | Holcroft & Co | Apparatus for treating metal parts |
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