AU2004100392A4 - Treatment of Austenitic Ferrous Metals - Google Patents
Treatment of Austenitic Ferrous Metals Download PDFInfo
- Publication number
- AU2004100392A4 AU2004100392A4 AU2004100392A AU2004100392A AU2004100392A4 AU 2004100392 A4 AU2004100392 A4 AU 2004100392A4 AU 2004100392 A AU2004100392 A AU 2004100392A AU 2004100392 A AU2004100392 A AU 2004100392A AU 2004100392 A4 AU2004100392 A4 AU 2004100392A4
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- AU
- Australia
- Prior art keywords
- austenitic
- abrasive
- steel
- ferrous metals
- shot
- 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.)
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- Crushing And Grinding (AREA)
Description
C04074i 1 TREATMENT OF AUSTENITIC FERROUS METALS FIELD OF THE INVENTION The present invention relates to the treatment of austenitic ferrous metals such as for example, articles formed from austenitic steel and in one particular example, austenitic manganese steel.
BACKGROUND OF THE INVENTION Austenitic manganese steel contains carbon and manganese. The combination of an extremely hard surface with a relatively soft, but tough, core makes the steel particularly suitable for, but not limited to, jaw crushers, cone crushers, and other "squeeze" type crushers.
With regard to the particular application of materials used in jaw crushers or gyratory crushers, a problem exists when the material to be crushed contains a high content of Si0 2 or free silica and high compressive strength. These properties make the component conducive to wearing away the parent metal, prior to it reaching a work hardened state. As an example, the wear parts (such as the mantle and concave) in a gyratory crusher in a crushing application, for relatively soft non siliceous rock such as basalt, may last 5 to 6 years. When handling harder materials, such as toscanite, the wear parts may last only 7 to 8 weeks.
It is an object of the present invention to provide a process of treating articles having an austenitic structure which alleviates, at least in part, one or more of the aforementioned problems.
SUMMARY OF THE INVENTION The present invention provides a process for treating articles of ferrous metals having an austenitic structure, the method including the step of subjecting selected surfaces of the article to a pretreatment step of abrasive or shot blasting or knurling so as to increase the hardness.
Preferably, the ferrous metal is austenitic manganese steel with the manganese content of the steel ranging from 11% to 26%.
Preferably the austenitic manganese steel has a carbon content in the range of 0.9% to 1.2%.
Preferably, the abrasive or shot blasting is for a period up to 60 seconds and more preferably, up to 20 seconds for an area being treated of about 300 mm 2 It has been found, that if the surfaces being treated are subjected to abrasive blasting for an extended period before being put in service, lesser damage or abrasion of the surfaces during normal service can take CO4074i 2 place.
The abrasive or shot material used in the blasting step can be of any suitable form such as for example, shot in. the form of steel balls, or metallic or other grit.
The abrasive blasting can be effected using any suitable apparatus such as for example, a compressed air gun.
In the particular to application crushers, such as gyratory crushers, the wear parts (such as the mantle and concave) will continue to work harden during use.
Preferably the article being treated is a wear component of a crushing device.
The invention also provides a crusher component casting of a ferrous metal having an austenitic structure which has had the process described above applied to it.
EXAMPLE
An embodiment of the invention will now be described, by way of example only, with reference to the following example: A casting of a wear component of crusher was produced from austenitic manganese steel having a manganese content of about 18%.
Prior to treatment according to the invention the Brinell Hardness Number (BHN) of the steel of the casting was measured to be in the order of 200 BHN.
The wear surfaces of the casting was subject to abrasive blasting for a period of about seconds. Steel shot of ASTI 5330, or 5390 was used, which was ejected through a tungsten carbide venturi nozzle having 1" diameter input and a reduced throat of 5 1 6 ths of an inch in diameter. The compressed air source utilised was a 212 cubic feet per minute compressor which produced 105 to 110 PSI at the venturi nozzle. A 600 pound Burwell Pressure Blast unit was used as a hopper for the shot, and was used to feed the shot to the venturi for entrainment in the compressed air flow and ejection therefrom.
After the pretreatment the BHN was then measured at from 220 to 230 BHN.
The pre-hardening pre-treatment of the wearing parts of, for example, a crusher, resists further significant wear created by highly abrasive or hard feed materials. The wear parts will further work harden during operation and provide for a better service than conventionally formed parts.
In the above example the austenitic manganese steel had a carbon content in the range CO4074i 3 of 0.9% to however it will be readily understood by a person skilled in the art that the percentage of carbon and manganese can be varied according to the percentages of other alloying elements which may be present.
The pretreatment can also be performed by means of impinging other abrasives onto the surfaces of the casting, or by knurling or other similar processes.
Finally, it is to be understood that the inventive concept in any of its aspects can be incorporated in many different constructions. Various alterations, modifications and/or additions may be incorporated into the various constructions of parts without departing from the spirit or ambit of the invention.
Claims (4)
1. A process for treating articles of ferrous metals having an austenitic structure, the method including the step of subjecting selected surfaces of the article to a pretreatment step of abrasive or shot blasting or knurling so as to increase the hardness.
2. A process as claimed in claim 1, wherein the ferrous metal is austenitic manganese steel with the manganese content of the steel ranging from 11% to 26%.
3. A process as claimed in claim 1 or 2, wherein said abrasive or shot blasting or knurling is for a period up to 60 seconds or up to 20 seconds, for an area being treated of about 300 mm 2
4. A process as claimed in any one of the preceding claims wherein said abrasive or shot material used in the blasting step is one of or a combination of: steel balls; metallic grit; or other grit. A crusher component casting of a ferrous metal with an austenitic structure having its surfaces pretreated by the process of any one of claims 1 to 4. Dated this 24th day of May, 2004 CUTTING EDGES PTY LIMITED By Its Patent Attorneys ni Halford Co
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2004100392A AU2004100392A4 (en) | 2003-05-23 | 2004-05-24 | Treatment of Austenitic Ferrous Metals |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2003902581A AU2003902581A0 (en) | 2003-05-23 | 2003-05-23 | Treatment of austenitic ferrous metals |
| AU2003902581 | 2003-05-23 | ||
| AU2004100392A AU2004100392A4 (en) | 2003-05-23 | 2004-05-24 | Treatment of Austenitic Ferrous Metals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2004100392A4 true AU2004100392A4 (en) | 2004-06-17 |
Family
ID=34314610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2004100392A Expired AU2004100392A4 (en) | 2003-05-23 | 2004-05-24 | Treatment of Austenitic Ferrous Metals |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU2004100392A4 (en) |
-
2004
- 2004-05-24 AU AU2004100392A patent/AU2004100392A4/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FGI | Letters patent sealed or granted (innovation patent) | ||
| PC | Assignment registered |
Owner name: CUTTING EDGES REPLACEMENT PARTS PTY LTD Free format text: FORMER OWNER WAS: CUTTING EDGES PTY LTD |
|
| MK22 | Patent ceased section 143a(d), or expired - non payment of renewal fee or expiry |