CA1339715C - Abrasion resistant composite casting and production method thereof - Google Patents
Abrasion resistant composite casting and production method thereofInfo
- Publication number
- CA1339715C CA1339715C CA000575723A CA575723A CA1339715C CA 1339715 C CA1339715 C CA 1339715C CA 000575723 A CA000575723 A CA 000575723A CA 575723 A CA575723 A CA 575723A CA 1339715 C CA1339715 C CA 1339715C
- Authority
- CA
- Canada
- Prior art keywords
- cast iron
- cemented carbide
- fine pieces
- pieces
- white cast
- 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 - Fee Related
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
- C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
- C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
- C22C33/0292—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with more than 5% preformed carbides, nitrides or borides
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Powder Metallurgy (AREA)
Abstract
An abrasion resistant composite casting to be incorporated in an apparatus used under severe abrasion conditions. The composite casting is most suitable for such abrasion condition brought about by high hard particles. The composite casting includes fine pieces of cemented carbide and a cast iron of white pig iron structure which combines the fine pieces to give a required form. The fine pieces of cemented carbide are in the form of crushed pieces, granular pieces or compressively molded compacts or a combination of the above. At least 70% of the fine pieces have a grain size in the range 2 to 15 mm. The fine pieces form an abrasive resistant surface with a white cast iron filing any gaps between the fine pieces.
Description
ABRASION RESISTANT COMPOSITE CASTING
AND PRODUCTION METHOD THEREOF
The present invention relates to an abrasion resistant material.
Heretofore, components exposed to severe abrasion, have been made of material having high abrasion resistance, such as 12% Mn steel (Hadfield's manganese steel), 27% Cr cast iron or the like.
There is still a need for greater durability. To meet this need, manufacturers have attempted to develop a composite material having higher abrasion resistance.
Several promising composites have been proposed in this respect. An invention entitled "A composite including sintered carbide and cast iron" disclosed in Japanese Patent Publication (examined) No. 60-11096 is worthy of note as typical of the prior art.
According to this prior art, a composite is made of a cemented carbide and cast iron. Although the cast iron itself includes a graphite cast iron having a rather low abrasion resistance and hardness, its carbon equivalent is adjusted to 2.5 to 6Ø An intermediate alloy phase or transition zone is formed between the cemented carbide and cast iron, and 20 - 80% of the cemented carbide is located in the transition zone. The above publication discloses several examples for optimum operating conditions. It is indicated that remarkable superiority over the prior art is achieved when the composite is applied to a liner of a coal crusher, a bit or bit holder of a 3 inch rock drill and a die for a molding head under normal temperature. The prior art discussed in the published application was hard martensite cast iron, manganese steel, a conventional bit holder of high quality fatigue resistant steel, or the steel bit itself, and a conventional die of ball bearing steel.
1339~1~
It is also indicated that such superiority is achieved because transition can take place between the hard cemented carbide and soft graphite cast iron to provide desirable resistance to strong impact. It is further indicated that when applying the composite to a bit holder, for example, of a rock drill, dynamic strain is reduced and spread due to a low Young's modulus and large damping capacity, which avoids concentration of impact load.
A problem, however, exists in that it is impossible to coat completely the entire surface to be exposed to abrasion with the cemented carbide of high hardness.
Particularly when graphite cast iron breaks down into particles and comes out on the surface, there is the possibility of deterioration - varying with the operating conditions - due to low hardness and low abrasion resistance of the graphite cast iron. The problem is more serious when the composite is confronted with such abrasion as scratching, beating and scraping brought about by hard particles. The graphite cast iron infiltrated into the boundary of the cemented carbide can absorb strong shock and hold the carbide, but will not be able to resist abrasion, which will quickly wear it out.
Thus the cemented carbide will soon peel off without exhibiting its excellent abrasion resistance.
It is possible to thicken the layer of cemented carbide to extend its life or improve its durability, but such an approach is not always practical in view of a considerable increase in cost and technical difficulty in infiltrating the cast layer into the whole particle layer. Another problem is that the large intermediate layer in the above prior art is effective in improving the low hardness of graphite cast iron, but diminishes the hardness of the cemented carbide, eventually resulting in reduction of abrasion resistance. There is 1~39715 a further problem that substitution of cobalt, largely applied to the cemented carbide, results in formation of a brittle phase.
The present invention seeks to solve the above discussed problems and to provide a composite casting having high resistance to abrasion.
Accordingly, the present invention provides an abrasion resistant composite casting including fine pieces of cemented carbide, and a white cast iron to bind said fine pieces into a required form, the fine pieces of cemented carbide being in the form of crushed pieces, granular particles or compressively molded compacts, or a combination thereof, at least 70% of the fine pieces having a grain size in the range 2 - 15 mm, the fine pieces forming an abrasive-resistant surface with the white cast iron filling any gaps between the fine pieces.
It is preferable that the white cast iron be mainly composed of a complex carbide to which an alloying - element is added, in which carbon is included in a range of 2.5% to 4.0% and the ratio of chromium to carbon (Cr to C) is in a range of 1 to 12.
The invention also provides a method for producing an abrasion resistant composite casting comprising the steps of casting a molten cast iron whose structure after solidification is white cast iron to a cemented carbide layer of T cm in thickness, wherein the casting temperature of the molten cast iron is within the range (50 T + Mp)~C to (180 (1.75 + T) + Mp)~C where Mp is the melting point of the white cast iron.
Compared with graphite cast iron, the white cast iron can be a material of high hardness, for example, cementite or martensite. To improve abrasion resistance 133371~
of such cast iron, it is well known that an alloy element, for example, chromium, can be added and melted so that a complex carbide of iron and chromium is precipitated on a matrix after solidification. Hardness of the matrix itself is improved. In this respect, according to the invention, carbon is most preferably included in a range of 2.5% to 4.0%, while the ratio of chromium to carbon is in the range 1 to 12. If the ratio is less than 1, precipitation of complex carbide is poor and matrix hardness is low, resulting in precipitation of graphite. If the ratio is more than 12, the carbon needed for production of carbide is insufficient so that carbon is taken from the cemented carbide, resulting in formation of a brittle phase at the boundary between the cast iron and cemented carbide.
Furthermore, for complete infiltration of the molten white cast iron into small gaps formed among cemented carbide particles, the casting temperature of the molten white cast iron should be higher than the melting point O(~C) thereof by at least 50 T(~C) where the thickness of the particle layer is T cm. In addition, in order to prevent excessive solution of the cemented carbide in the white cast iron, the temperature of the molten white cast iron should also be in the range of the melting point thereof to 180 (1.75 + T) (~C).
Concerning the particles, if the grain size is too small, gaps formed between the cemented carbide particles are also too small to allow the white cast iron into the gaps among the particles, even at raised casting tem-perature. Moreover, if the casting temperature is toohigh, the amount of the cemented carbide dissolved in the white cast iron increases considerably. On the other hand, if the grain size is too large, not only is the volume ratio of the cemented carbide reduced, but also the average distance between the particles in which the 133971~
white cast iron matrix is cut by abrasive particles is increased. This reduces the abrasion resistance.
Accordingly, at least 70% of the particles have a grain size in the range 2 - 15 mm.
As mentioned above, the composite casting according to the invention exhibits excellent resistance to abrasion without impact or abrasion with low impact, in particular to abrasion resulting from scratching, sliding, surface scraping caused by hard fine particles (of ore, coal, coke, abrasive grain, soil fraction, etc.). In the composite casting according to the invention, the high abrasion resistance of the cemented carbide, which is a high hardness alloy, is kept and supported by the white cast iron serving as matrix. The surface is hardly worn or abraded owing to its high abrasion resistance rendered by these two components mated with each other, thereby achieving excellent durability. In particular, by producing a composite casting with the preferable C%, Cr to C ratio, grain size of cemented carbide and casting temperature of molten cast iron, a composite casting of long life can be attained.
The invention is described further in the following examples and in the accompanying drawings, in which:
Figure 1 is a microphotograph of the metallic structure according to an embodiment of the present invention; and Figure 2 is a microphotograph of the metallic structure according to the prior art.
Discussing first the prior art, Figure 2 is a microphotograph of the metallic structure of the acknowledged prior art obtained as a result of tests carried out by applicant. This photograph of 50 x 13397 la magnification shows, from left to right, a composite of three phases, i.e., nodular graphite cast iron, an intermediate layer and cemented carbide. Each layer is adjacent another layer. It can easily be understood that the intermediate layer absorbs strong shock and prevents rupture and peeling.
Example 1:
Three plates were prepared as comparative examples.
Plate (l) made of 2.6% C - 26% Cr white cast iron, plate (2) made of almina sintered plate and a composite plate (3) made of a cemented carbide particle layer of 10 mm in thickness and with a nodular graphite cast iron matrix.
A fourth composite plate (4) including a cemented carbide layer of 6 mm in thickness and a matrix of 2.8%C - 24% Cr - Ni - Mo according to the invention was also prepared.
These four plates were each used as a shooting liner in a conveyor line for conveying sintered ore in an iron mill.
The lives of the four liners were as follows:
(1) liner of 2.6% C - 26% Cr white cast iron...... ................... 30 days (2) liner of alumina sintered plate.......... 40 days (3) liner of cemented carbide layer and nodular graphite matrix ........................ 150 days (4) liner according to the invention........ 500 days Thus a significant improvement in abrasion resistance of the matrix according to the invention was achieved. Performance was better than prior art cemented carbide particles, in spite of a reduction of the amount of expensive cemented carbide by half as compared with liner (3).
133971~
Example 2:
Two plates were prepared as comparative examples.
Plate (1) was made of 2.7% C- 28% Cr white cast iron and plate (2) of hard facing material. A composite plate (3), including a cemented carbide particle layer of 15 mm thickness and a matrix of 3.2% C - 2.5% Cr - 4% Ni according to the invention, was also prepared. These three plates were used as crushing plates in a machine for crushing sintered ores.
The life of each crushing plate was as follows:
(1) plate of 2.7% C - 28% Cr white cast iron....... ................... 60 days (2) plate of hard facing..................... .45 days (3) plate according to the invention......... 240 days Figure 1 is a microphotograph (200 magnifications) of the metal structure around the boundary between the white cast iron and cemented carbide (WC - Co) of the composite produced in this Example 2. In the photograph, the cast iron is seen on the left side and the cemented carbide on the right side. A very thin intermediate layer is barely found at the boundary.
Example 3:
A plate (1) made of 2.7% C - 28% Cr white cast iron was prepared as a comparative example. A composite plate (2) including a cemented carbide particle layer of 15 mm thickness and a matrix of 3.2% C - 2.5% Cr - 4% Ni according to the invention was also prepared. These two plates were used each as a liner incorporated in a section for gyrationally shooting materials of a blast furnace installed in an iron mill. Under the same conditions, the life of each liner was as follows:
133971.5 (1) liner of 2.7% C - 28% Cr white cast iron liner.................. .1 month (2) liner according to the invention........ 8 months Example 4:
A plate (1) made of alumina sintered plate and another plate (2) made of hard facing material of 5.5%
C 22% Cr - 7% Mo - 8% Nb - 2% W were prepared as comparative examples. A composite plate (3) including a cemented carbide particle layer of 8 mm in thickness and a matrix of 2.6% C - 27% Cr - Ni - Mo according to the invention was also prepared. These three plates were used as liners in the skip car of a blast furnace. The life of each liner was as follows:
(1) liner of alumina sintered plate......... .90 days (2) liner of hardening and thickening material.................... 270 days (3) liner according to the invention not less than............. 720 days Example 5:
A plate (1) made of 3.0% C - 26% Cr white cast iron was prepared as a comparative example. A composite plate (2) including a cemented carbide particle layer of 8 mm in thickness and a matrix of 2.7% C - 25% Cr - Mo according to the invention was also prepared. The two plates were used as liners at the inlet of a mixer for shooting sintered ore materials. The life of each liner was as follows:
(1) liner of 3.0% C - 26%
Cr white cast iron..................... .45 days (2) liner according to the invention not less than........... 650 days 133971~
Example 6:
A plate (1) made of 3.2% C - 15% Cr - 3% Mo white cast iron was compared with a composite plate (2) including a cemented carbide particle layer of 8 mm in thickness and a matrix of 2.8% C - 25% Cr white cast iron according to the invention. The plates were used as side liners in a conveying line for sintered ores. The life of each liner was as follows:
(1) liner of 3.2% C - 15% Cr - 3% Mo white cast iron..................................... 90 days (2) liner according to the invention ..... not less than 980 days
AND PRODUCTION METHOD THEREOF
The present invention relates to an abrasion resistant material.
Heretofore, components exposed to severe abrasion, have been made of material having high abrasion resistance, such as 12% Mn steel (Hadfield's manganese steel), 27% Cr cast iron or the like.
There is still a need for greater durability. To meet this need, manufacturers have attempted to develop a composite material having higher abrasion resistance.
Several promising composites have been proposed in this respect. An invention entitled "A composite including sintered carbide and cast iron" disclosed in Japanese Patent Publication (examined) No. 60-11096 is worthy of note as typical of the prior art.
According to this prior art, a composite is made of a cemented carbide and cast iron. Although the cast iron itself includes a graphite cast iron having a rather low abrasion resistance and hardness, its carbon equivalent is adjusted to 2.5 to 6Ø An intermediate alloy phase or transition zone is formed between the cemented carbide and cast iron, and 20 - 80% of the cemented carbide is located in the transition zone. The above publication discloses several examples for optimum operating conditions. It is indicated that remarkable superiority over the prior art is achieved when the composite is applied to a liner of a coal crusher, a bit or bit holder of a 3 inch rock drill and a die for a molding head under normal temperature. The prior art discussed in the published application was hard martensite cast iron, manganese steel, a conventional bit holder of high quality fatigue resistant steel, or the steel bit itself, and a conventional die of ball bearing steel.
1339~1~
It is also indicated that such superiority is achieved because transition can take place between the hard cemented carbide and soft graphite cast iron to provide desirable resistance to strong impact. It is further indicated that when applying the composite to a bit holder, for example, of a rock drill, dynamic strain is reduced and spread due to a low Young's modulus and large damping capacity, which avoids concentration of impact load.
A problem, however, exists in that it is impossible to coat completely the entire surface to be exposed to abrasion with the cemented carbide of high hardness.
Particularly when graphite cast iron breaks down into particles and comes out on the surface, there is the possibility of deterioration - varying with the operating conditions - due to low hardness and low abrasion resistance of the graphite cast iron. The problem is more serious when the composite is confronted with such abrasion as scratching, beating and scraping brought about by hard particles. The graphite cast iron infiltrated into the boundary of the cemented carbide can absorb strong shock and hold the carbide, but will not be able to resist abrasion, which will quickly wear it out.
Thus the cemented carbide will soon peel off without exhibiting its excellent abrasion resistance.
It is possible to thicken the layer of cemented carbide to extend its life or improve its durability, but such an approach is not always practical in view of a considerable increase in cost and technical difficulty in infiltrating the cast layer into the whole particle layer. Another problem is that the large intermediate layer in the above prior art is effective in improving the low hardness of graphite cast iron, but diminishes the hardness of the cemented carbide, eventually resulting in reduction of abrasion resistance. There is 1~39715 a further problem that substitution of cobalt, largely applied to the cemented carbide, results in formation of a brittle phase.
The present invention seeks to solve the above discussed problems and to provide a composite casting having high resistance to abrasion.
Accordingly, the present invention provides an abrasion resistant composite casting including fine pieces of cemented carbide, and a white cast iron to bind said fine pieces into a required form, the fine pieces of cemented carbide being in the form of crushed pieces, granular particles or compressively molded compacts, or a combination thereof, at least 70% of the fine pieces having a grain size in the range 2 - 15 mm, the fine pieces forming an abrasive-resistant surface with the white cast iron filling any gaps between the fine pieces.
It is preferable that the white cast iron be mainly composed of a complex carbide to which an alloying - element is added, in which carbon is included in a range of 2.5% to 4.0% and the ratio of chromium to carbon (Cr to C) is in a range of 1 to 12.
The invention also provides a method for producing an abrasion resistant composite casting comprising the steps of casting a molten cast iron whose structure after solidification is white cast iron to a cemented carbide layer of T cm in thickness, wherein the casting temperature of the molten cast iron is within the range (50 T + Mp)~C to (180 (1.75 + T) + Mp)~C where Mp is the melting point of the white cast iron.
Compared with graphite cast iron, the white cast iron can be a material of high hardness, for example, cementite or martensite. To improve abrasion resistance 133371~
of such cast iron, it is well known that an alloy element, for example, chromium, can be added and melted so that a complex carbide of iron and chromium is precipitated on a matrix after solidification. Hardness of the matrix itself is improved. In this respect, according to the invention, carbon is most preferably included in a range of 2.5% to 4.0%, while the ratio of chromium to carbon is in the range 1 to 12. If the ratio is less than 1, precipitation of complex carbide is poor and matrix hardness is low, resulting in precipitation of graphite. If the ratio is more than 12, the carbon needed for production of carbide is insufficient so that carbon is taken from the cemented carbide, resulting in formation of a brittle phase at the boundary between the cast iron and cemented carbide.
Furthermore, for complete infiltration of the molten white cast iron into small gaps formed among cemented carbide particles, the casting temperature of the molten white cast iron should be higher than the melting point O(~C) thereof by at least 50 T(~C) where the thickness of the particle layer is T cm. In addition, in order to prevent excessive solution of the cemented carbide in the white cast iron, the temperature of the molten white cast iron should also be in the range of the melting point thereof to 180 (1.75 + T) (~C).
Concerning the particles, if the grain size is too small, gaps formed between the cemented carbide particles are also too small to allow the white cast iron into the gaps among the particles, even at raised casting tem-perature. Moreover, if the casting temperature is toohigh, the amount of the cemented carbide dissolved in the white cast iron increases considerably. On the other hand, if the grain size is too large, not only is the volume ratio of the cemented carbide reduced, but also the average distance between the particles in which the 133971~
white cast iron matrix is cut by abrasive particles is increased. This reduces the abrasion resistance.
Accordingly, at least 70% of the particles have a grain size in the range 2 - 15 mm.
As mentioned above, the composite casting according to the invention exhibits excellent resistance to abrasion without impact or abrasion with low impact, in particular to abrasion resulting from scratching, sliding, surface scraping caused by hard fine particles (of ore, coal, coke, abrasive grain, soil fraction, etc.). In the composite casting according to the invention, the high abrasion resistance of the cemented carbide, which is a high hardness alloy, is kept and supported by the white cast iron serving as matrix. The surface is hardly worn or abraded owing to its high abrasion resistance rendered by these two components mated with each other, thereby achieving excellent durability. In particular, by producing a composite casting with the preferable C%, Cr to C ratio, grain size of cemented carbide and casting temperature of molten cast iron, a composite casting of long life can be attained.
The invention is described further in the following examples and in the accompanying drawings, in which:
Figure 1 is a microphotograph of the metallic structure according to an embodiment of the present invention; and Figure 2 is a microphotograph of the metallic structure according to the prior art.
Discussing first the prior art, Figure 2 is a microphotograph of the metallic structure of the acknowledged prior art obtained as a result of tests carried out by applicant. This photograph of 50 x 13397 la magnification shows, from left to right, a composite of three phases, i.e., nodular graphite cast iron, an intermediate layer and cemented carbide. Each layer is adjacent another layer. It can easily be understood that the intermediate layer absorbs strong shock and prevents rupture and peeling.
Example 1:
Three plates were prepared as comparative examples.
Plate (l) made of 2.6% C - 26% Cr white cast iron, plate (2) made of almina sintered plate and a composite plate (3) made of a cemented carbide particle layer of 10 mm in thickness and with a nodular graphite cast iron matrix.
A fourth composite plate (4) including a cemented carbide layer of 6 mm in thickness and a matrix of 2.8%C - 24% Cr - Ni - Mo according to the invention was also prepared.
These four plates were each used as a shooting liner in a conveyor line for conveying sintered ore in an iron mill.
The lives of the four liners were as follows:
(1) liner of 2.6% C - 26% Cr white cast iron...... ................... 30 days (2) liner of alumina sintered plate.......... 40 days (3) liner of cemented carbide layer and nodular graphite matrix ........................ 150 days (4) liner according to the invention........ 500 days Thus a significant improvement in abrasion resistance of the matrix according to the invention was achieved. Performance was better than prior art cemented carbide particles, in spite of a reduction of the amount of expensive cemented carbide by half as compared with liner (3).
133971~
Example 2:
Two plates were prepared as comparative examples.
Plate (1) was made of 2.7% C- 28% Cr white cast iron and plate (2) of hard facing material. A composite plate (3), including a cemented carbide particle layer of 15 mm thickness and a matrix of 3.2% C - 2.5% Cr - 4% Ni according to the invention, was also prepared. These three plates were used as crushing plates in a machine for crushing sintered ores.
The life of each crushing plate was as follows:
(1) plate of 2.7% C - 28% Cr white cast iron....... ................... 60 days (2) plate of hard facing..................... .45 days (3) plate according to the invention......... 240 days Figure 1 is a microphotograph (200 magnifications) of the metal structure around the boundary between the white cast iron and cemented carbide (WC - Co) of the composite produced in this Example 2. In the photograph, the cast iron is seen on the left side and the cemented carbide on the right side. A very thin intermediate layer is barely found at the boundary.
Example 3:
A plate (1) made of 2.7% C - 28% Cr white cast iron was prepared as a comparative example. A composite plate (2) including a cemented carbide particle layer of 15 mm thickness and a matrix of 3.2% C - 2.5% Cr - 4% Ni according to the invention was also prepared. These two plates were used each as a liner incorporated in a section for gyrationally shooting materials of a blast furnace installed in an iron mill. Under the same conditions, the life of each liner was as follows:
133971.5 (1) liner of 2.7% C - 28% Cr white cast iron liner.................. .1 month (2) liner according to the invention........ 8 months Example 4:
A plate (1) made of alumina sintered plate and another plate (2) made of hard facing material of 5.5%
C 22% Cr - 7% Mo - 8% Nb - 2% W were prepared as comparative examples. A composite plate (3) including a cemented carbide particle layer of 8 mm in thickness and a matrix of 2.6% C - 27% Cr - Ni - Mo according to the invention was also prepared. These three plates were used as liners in the skip car of a blast furnace. The life of each liner was as follows:
(1) liner of alumina sintered plate......... .90 days (2) liner of hardening and thickening material.................... 270 days (3) liner according to the invention not less than............. 720 days Example 5:
A plate (1) made of 3.0% C - 26% Cr white cast iron was prepared as a comparative example. A composite plate (2) including a cemented carbide particle layer of 8 mm in thickness and a matrix of 2.7% C - 25% Cr - Mo according to the invention was also prepared. The two plates were used as liners at the inlet of a mixer for shooting sintered ore materials. The life of each liner was as follows:
(1) liner of 3.0% C - 26%
Cr white cast iron..................... .45 days (2) liner according to the invention not less than........... 650 days 133971~
Example 6:
A plate (1) made of 3.2% C - 15% Cr - 3% Mo white cast iron was compared with a composite plate (2) including a cemented carbide particle layer of 8 mm in thickness and a matrix of 2.8% C - 25% Cr white cast iron according to the invention. The plates were used as side liners in a conveying line for sintered ores. The life of each liner was as follows:
(1) liner of 3.2% C - 15% Cr - 3% Mo white cast iron..................................... 90 days (2) liner according to the invention ..... not less than 980 days
Claims (3)
1. An abrasion resistant composite casting including fine pieces of cemented carbide, and a white cast iron to bind said fine pieces into a required form, the fine pieces of cemented carbide being in the form of crushed pieces, granular particles or compressively molded compacts, or a combination thereof, at least 70% of the fine pieces having a grain size in the range 2 - 15 mm, the fine pieces forming an abrasive-resistant surface with the white cast iron filling any gaps between the fine pieces.
2. An abrasion resistant composite casting according to claim 1, wherein the white cast iron is mainly composed of a complex carbide to which an alloying element is added, and in which carbon is included in a range of 2.5%
to 4.0% and the ratio of chromium to carbon (Cr/C) is in the range 1 to 12.
to 4.0% and the ratio of chromium to carbon (Cr/C) is in the range 1 to 12.
3. A method for producing an abrasion resistant composite casting comprising the steps of casting a molten cast iron whose structure after solidification is white cast iron to a cemented carbide layer of T cm in thickness, wherein the casting temperature of the molten cast iron is within the range (50 T + Mp)°C to (180 (1.75 + T) + Mp)°C where Mp is the melting point of the white cast iron.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62215815A JP2602029B2 (en) | 1987-08-28 | 1987-08-28 | Method for producing abrasion resistant composite casting |
| JPJPA62-215815 | 1987-08-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1339715C true CA1339715C (en) | 1998-03-17 |
Family
ID=16678714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000575723A Expired - Fee Related CA1339715C (en) | 1987-08-28 | 1988-08-25 | Abrasion resistant composite casting and production method thereof |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0380715A1 (en) |
| JP (1) | JP2602029B2 (en) |
| KR (1) | KR890003476A (en) |
| AU (1) | AU621550B2 (en) |
| CA (1) | CA1339715C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE522667C2 (en) * | 2000-05-16 | 2004-02-24 | Proengco Tooling Ab | Process for the preparation of an iron-based chromium carbide containing dissolved tungsten and such an alloy |
| ES2212708B2 (en) * | 2002-02-27 | 2005-04-01 | Urbar Ingenieros, S.A. | SUPPORT AND BEARING SYSTEM FOR FOUNDRY REMOVAL DRUM. |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB183063A (en) * | 1900-01-01 | |||
| US3941181A (en) * | 1972-05-17 | 1976-03-02 | Stoody Company | Process for casting faced objects using centrifugal techniques |
| GB1582574A (en) * | 1977-05-14 | 1981-01-14 | Permanence Corp | Method of forming a metal-metallic carbide composite |
| JPS59199165A (en) * | 1983-04-27 | 1984-11-12 | Koubukuro Kosakusho:Kk | Joining method of chromium cast iron and sintered hard alloy |
| ZA844074B (en) * | 1983-05-30 | 1986-04-30 | Vickers Australia Ltd | Abrasion resistant materials |
| JPS60501799A (en) * | 1983-07-05 | 1985-10-24 | コンモンウエルス・サイエンテイフイツク・アンド・インダストリアル・リサ−チ・オ−ガナイゼ−シヨン | composite metal articles |
| US4635701A (en) * | 1983-07-05 | 1987-01-13 | Vida-Weld Pty. Limited | Composite metal articles |
| JPS60206557A (en) * | 1984-03-30 | 1985-10-18 | Koubukuro Kosakusho:Kk | Joining method of cast iron and cermet |
| JPH0611096A (en) * | 1992-06-19 | 1994-01-21 | Nippon Steel Chem Co Ltd | Heat-insulating cylinder and manufacturing method thereof |
-
1987
- 1987-08-28 JP JP62215815A patent/JP2602029B2/en not_active Expired - Lifetime
-
1988
- 1988-08-17 AU AU21045/88A patent/AU621550B2/en not_active Ceased
- 1988-08-25 CA CA000575723A patent/CA1339715C/en not_active Expired - Fee Related
- 1988-08-26 KR KR1019880010860A patent/KR890003476A/en not_active Ceased
-
1989
- 1989-01-28 EP EP89101505A patent/EP0380715A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| AU621550B2 (en) | 1992-03-19 |
| EP0380715A1 (en) | 1990-08-08 |
| JPS6457963A (en) | 1989-03-06 |
| KR890003476A (en) | 1989-04-15 |
| AU2104588A (en) | 1989-03-02 |
| JP2602029B2 (en) | 1997-04-23 |
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Legal Events
| Date | Code | Title | Description |
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| MKLA | Lapsed |