US1760240A - Heat treating of metals - Google Patents
Heat treating of metals Download PDFInfo
- Publication number
- US1760240A US1760240A US231789A US23178927A US1760240A US 1760240 A US1760240 A US 1760240A US 231789 A US231789 A US 231789A US 23178927 A US23178927 A US 23178927A US 1760240 A US1760240 A US 1760240A
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- US
- United States
- Prior art keywords
- temperature
- carbon
- heating
- heat treating
- metals
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- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
Definitions
- ordinary .mal leableized cast iron is granular in its structure, being composed mainly of grains of ferrite and small articles of carbon or ne step in the present method or process is designed to cause a combination of the carbon and the ferrite in order to form pearlite or iron carbide.
- the malleableized cast iron parts which are to be treated are first cleaned by any suitable method and are thereafter heated. This heating will usually be done in furnaces, but
- the Iron is raised to a temperature in the neighborhood of 1475" F. This temperature is given as approximating the best temperature, but a variation eitherabove or below this temperature is possible. After thema- -ter1al has reached the critical or carbon combining temperature a part of the carbon is combinedwith ferrite. The length of time that the material being treated must-be held at this temperature varies with the size ofv air, oil, water or other medium. In ordinary practice, no part cular effort 1s made to cool the metal slowly and where it is quenched in oil ora'liquid, it is usually cooled rapidly. Where it is desired to give the metal a tough 4 and wear-resisting outer coat, the heating op- Appllcati on flled lq 'ovemh'er 'i, I927. Serial No. 231,789.
- the material being treated When the material being treated has been first heated and quenched, it is thereafter reheated to a temperature not exceeding the critical or carbon combining temperature. The result of this second heating is to cause the martensite or troostite retained after the first heating to break down into pearlite or sorbite. This change will normally be effected at a temperature range of 900 F. to 1200 F. After the first heating, then, the metal may be heated a second time to approximately 1200 F. and it is subsequently cooled or quenched.
- the process of treating malleableized cast iron containin ferrite and graphitic carbon, which include es the following steps; heating it to a point above the carbon combining temperature and quenching it to cause the formation of martensite and troostite, reheating it to a temperature suflicient to cause the martensite and troostite to break down to form sorbite or pearlite, and cooling it.
Description
15 graphitic carbon.
Patented May 27, 1930 CARL I. LAUENSTEIN, F INDIANAPOLIS,
"UNITED STATE -PATENT OFFICE,
INDIANA, ASSIGNOR 'ro LINK-BELT cou- PANY, on CHICAGO, ILLINOIS, A gonPoRA'rIoN or ILL NOIS HEAT TREATING on METALS No Drawing.
by the hot dripping process, without 'such galvanizing causing any appreciable change in the properties or structure of the material, and particularly without suchfgalvanizing causing deteriorationin the quality of-the metal.
As generally understood, ordinary .mal leableized cast iron is granular in its structure, being composed mainly of grains of ferrite and small articles of carbon or ne step in the present method or process is designed to cause a combination of the carbon and the ferrite in order to form pearlite or iron carbide.
' Other objects will appear from time to time in the specification and claims.
The malleableized cast iron parts which are to be treated are first cleaned by any suitable method and are thereafter heated. This heating will usually be done in furnaces, but
may, of course, be done'by any other means.
The Iron is raised to a temperature in the neighborhood of 1475" F. This temperature is given as approximating the best temperature, but a variation eitherabove or below this temperature is possible. After thema- -ter1al has reached the critical or carbon combining temperature a part of the carbon is combinedwith ferrite. The length of time that the material being treated must-be held at this temperature varies with the size ofv air, oil, water or other medium. In ordinary practice, no part cular effort 1s made to cool the metal slowly and where it is quenched in oil ora'liquid, it is usually cooled rapidly. Where it is desired to give the metal a tough 4 and wear-resisting outer coat, the heating op- Appllcati on flled lq 'ovemh'er 'i, I927. Serial No. 231,789.
eration will be carried out in the presence I of a' carburizing agent. p
When the material being treated has been first heated and quenched, it is thereafter reheated to a temperature not exceeding the critical or carbon combining temperature. The result of this second heating is to cause the martensite or troostite retained after the first heating to break down into pearlite or sorbite. This change will normally be effected at a temperature range of 900 F. to 1200 F. After the first heating, then, the metal may be heated a second time to approximately 1200 F. and it is subsequently cooled or quenched. It may-thereafter be galvanized by hot dipping and since the normal temperatures of such hot galvanizing are well below 1200 R, such subsequent galvaniz ing does not materially change the structure of the material and therefore hot galvanizing malleableized cast iron which has been treated by the method above set out does not appreciably affect the strength of the metal and does not embrittle it.
I claim:
1. The process of heat treating malleableized cast iron which includes heating the iron to approximately 1475 quenching and reheating to approximatel 1200 F.
2. The process of treating malleableized' cast iron which includes the following steps': heating the metal to a temperature higher than the carbon combining temperature,
quenching it and reheating it to a temperature below the carbon combining temperature. L
3. The process of treating malleableized 7 cast iron containing ferrite and .graphltlc carbon, which includes the following steps: heating it to a point above the carbon combining temperature and quenching it, reheating it to atemperature sufficient to cause the martensite and troosite to break down to form sorbite or pearlite, and cooling it.
et. The process of treating malleableized cast iron containin ferrite and graphitic carbon, which inclu es the following steps; heating it to a point above the carbon combining temperature and quenching it to cause the formation of martensite and troostite, reheating it to a temperature suflicient to cause the martensite and troostite to break down to form sorbite or pearlite, and cooling it.
Si ed at Indianapolis, county of Marion and tate of Indiana, this 27th day of October, 1927.
CARL F. LAUENSTEIN.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US231789A US1760240A (en) | 1927-11-07 | 1927-11-07 | Heat treating of metals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US231789A US1760240A (en) | 1927-11-07 | 1927-11-07 | Heat treating of metals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1760240A true US1760240A (en) | 1930-05-27 |
Family
ID=22870651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US231789A Expired - Lifetime US1760240A (en) | 1927-11-07 | 1927-11-07 | Heat treating of metals |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1760240A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4134463A (en) * | 1977-06-22 | 1979-01-16 | Smith International, Inc. | Air lift system for large diameter borehole drilling |
-
1927
- 1927-11-07 US US231789A patent/US1760240A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4134463A (en) * | 1977-06-22 | 1979-01-16 | Smith International, Inc. | Air lift system for large diameter borehole drilling |
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