CN107312902B - Production method of high-chromium cast iron - Google Patents
Production method of high-chromium cast iron Download PDFInfo
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- CN107312902B CN107312902B CN201610290800.0A CN201610290800A CN107312902B CN 107312902 B CN107312902 B CN 107312902B CN 201610290800 A CN201610290800 A CN 201610290800A CN 107312902 B CN107312902 B CN 107312902B
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- cast iron
- chromium cast
- casting
- rabcy
- molding process
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- 229910001018 Cast iron Inorganic materials 0.000 title claims abstract description 41
- 239000011651 chromium Substances 0.000 title claims abstract description 41
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 238000005266 casting Methods 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 25
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 11
- 229910052802 copper Inorganic materials 0.000 claims abstract description 10
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 9
- 238000000465 moulding Methods 0.000 claims abstract description 9
- 239000002131 composite material Substances 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 239000004576 sand Substances 0.000 claims abstract description 7
- 238000003723 Smelting Methods 0.000 claims abstract description 6
- 239000013078 crystal Substances 0.000 claims abstract description 6
- 239000003607 modifier Substances 0.000 claims abstract description 6
- 238000010791 quenching Methods 0.000 claims abstract description 6
- 230000000171 quenching effect Effects 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 239000002826 coolant Substances 0.000 claims abstract description 4
- 239000004927 clay Substances 0.000 claims abstract description 3
- 238000007528 sand casting Methods 0.000 claims abstract description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 229910052727 yttrium Inorganic materials 0.000 claims description 3
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims description 3
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 2
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 2
- 150000002910 rare earth metals Chemical group 0.000 claims description 2
- 238000010079 rubber tapping Methods 0.000 claims description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 16
- 239000010949 copper Substances 0.000 description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000004568 cement Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910001309 Ferromolybdenum Inorganic materials 0.000 description 2
- 244000035744 Hura crepitans Species 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000788 chromium alloy Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/08—Manufacture of cast-iron
-
- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
-
- 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
- C21D5/00—Heat treatments of cast-iron
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a production method of high-chromium cast iron, which comprises the following steps: (1) in the burdening and smelting process, RABCY composite modifier is used to replace Mo, Cu, Ni and other elements to refine the crystal grains of the high-chromium cast iron casting, improve the structure and improve the performance of the casting, and the adding amount of the RABCY composite modifier is 1.2-1.5 percent of the total weight of furnace burden; (2) the novel casting molding process of using a precoated sand shell mold for casting and assisting high-frequency vibration in pouring replaces the traditional clay sand casting molding process in the casting molding process; (3) the quenching process of air cooling, gas cooling medium and wind speed sectional frequency conversion control is adopted to obtain the required structure of the high-chromium cast iron product and various high-quality properties of the product, the service life of the high-chromium cast iron produced by the method is 1.5-2 times of that of the high-chromium cast iron produced by the traditional process, and the cost is greatly reduced.
Description
Technical Field
The invention relates to a technology, which belongs to the casting and heat treatment technology of high-chromium cast iron in metal wear-resistant materials, in particular to a production method of the high-chromium cast iron.
Background
Because high-chromium cast iron has high hardness and excellent wear resistance and wear resistance, high-grade wear-resistant parts with extremely high requirements on wear resistance, such as a stirring blade and a lining plate of a cement stirring machine, a lining plate in a rotary tank of a cement transportation machine, an inner container and an inner lining of a cement conveying pipeline of a cement pumping machine, a lining plate and a grinding ball of a grinding mill in cement manufacturing and mineral separation, an impeller and a sheath of a slurry pump in slurry conveying, an inner lining of a conveying pipeline and the like, are usually manufactured by adopting a high-chromium cast iron casting process. In the traditional process for smelting and casting the high-chromium cast iron, in order to ensure and improve the performance and the service life of the high-chromium alloy cast iron, alloy elements such as Mo, Cu, Ni and the like must be added. Because the casting raw materials including the alloy elements such as Mo, Cu, Ni and the like, such as ferromolybdenum, metallic copper and metallic nickel (or nickel-containing stainless steel waste) are expensive, the contradiction between ensuring the high-quality performance of the product and reducing the manufacturing cost of the product is inevitably caused, namely, in the traditional manufacturing process of the high-chromium cast iron, if the contents of the elements such as Mo, Cu, Ni and the like are reduced, the product performance is necessarily reduced; if the product performance is ensured, the manufacturing cost of the product is difficult to reduce, so how to ensure the high-quality performance of the high-chromium cast iron and reduce the manufacturing cost of the product becomes a difficult problem to be solved urgently.
Disclosure of Invention
The object of the present invention is to improve and innovate the drawbacks and problems of the background art and to provide a method for producing high chromium cast iron.
The technical problem to be solved by the invention is realized by adopting the following technical scheme, which specifically comprises the following steps:
1. in the process of proportioning and smelting, RABCY composite modifier is used to replace Mo, Cu, Ni and other elements to refine crystal grains of high-chromium cast iron casting, improve the structure and the casting performance, and RABCY composite modificationThe mass agent is added in an amount of 1.2-1.5% of the total weight of the furnace charge, wherein R represents rare earth ferrosilicon FeSiRe29, A represents metal aluminum Al, B represents FeB20C0.5, and C represents Ca (OH)2Y represents metal yttrium, the addition amount of RABCY is 0.1-0.3kg, 0.1-0.2kg, 0.001-0.004kg, 0.5-2.0kg and 0.04-0.08kg per 100kg furnace charge respectively, the total amount is 1.2-1.5kg, Ca (OH)2The steel is placed at the bottom of the furnace in advance, and other materials are added into the furnace 5 minutes before tapping, and other smelting processes are the same as the traditional processes.
2. The novel casting molding process of using a precoated sand shell mold for casting and assisting high-frequency vibration in pouring replaces the traditional clay sand casting molding process in the casting molding process;
3. the quenching process of air cooling, gas cooling medium and wind speed sectional frequency conversion control is adopted to obtain the required structure of the high-chromium cast iron product and various high-quality properties of the product.
The invention has the beneficial effects that:
the invention refines the crystal grain of the high-chromium cast iron casting, improves the structure, can reduce the cost per ton of material on the premise of not reducing the casting performance (on the contrary, slightly improving the casting performance), and the cast casting is accurate, and simultaneously, the surface quality of the casting is better, thereby effectively removing the impurities in the high-chromium cast iron material, compacting the casting structure of the high-chromium cast iron, refining the crystal grain structure of the high-chromium cast iron, improving the hardness and the impact toughness of the high-chromium cast iron, comprehensively optimizing various performances of the high-chromium cast iron, and obviously improving the wear resistance (wear resistance) performance of the high-chromium cast iron. The service life of the high-chromium cast iron produced by the process is 1.5-2 times that of the high-chromium cast iron produced by the traditional process.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific examples.
The cast iron is Cr26 cast iron, and the percentage (%) of each element is as follows: 2.0 to 3.3, Si: 0.6 to 1.2, Mn: 0.8-1.8, S: less than or equal to 0.06, P: less than or equal to 0.1, Cr: 23-30, Mo: 3 or less and Ni: 2.5 or less, Cu: casting and heat treatment are carried out at a rate of less than or equal to 2.
(1) In the process of proportioning and smelting, the RABCY composite modifier is used for replacing elements such as Mo, Cu, Ni and the like to refine the crystal grains of the high-chromium cast iron casting, improve the structure and improve the performance of the casting.
(2) The casting section mould is a precoated sand shell section mould manufactured by a core shooting machine, and precoated sand particles are 70-140 meshes, namely, a precoated sand shell mould sand mould required for producing a casting is manufactured by the core shooting machine; then, the prepared shell mold stacked mold is well combined and placed in a proper sandbox, the periphery of the shell mold is filled with dry coarse quartz sand, and a pouring cup is arranged; the assembled sandbox is then transferred to a high frequency vibration table. When pouring, starting a high-frequency vibrator (the vibration frequency is 100-200 Hz), vibrating for 3-5 minutes and closing the high-frequency vibrator; then preserving the heat for 30 minutes, taking out the casting from the box and naturally cooling the casting.
(3) The novel high-chromium cast iron can be used for heating in vacuum furnaces, box-type electric furnaces and fuel furnaces. The temperature rise curve is:
① raising room temperature to 300 deg.C, keeping temperature at ② 300 deg.C for 0.5 hr, raising temperature at ③ 300 deg.C to 650 deg.C, keeping temperature at ④ 650 deg.C for 1.5 hr, raising temperature at ⑤ 650 deg.C to 1020 deg.C, keeping temperature at ⑥ 1020 deg.C for 2-4 hr, quenching with air cooling and gas cooling medium (atomized cold water, nitrogen or CO)2) And (3) quenching process of wind speed sectional frequency conversion control (casting temperature is 1020-500 ℃ for 1-3 minutes for fast cooling, and casting temperature is reduced to 500 ℃ for slow cooling). Tempering within 24 hours after quenching, wherein the tempering adopts a discharging air cooling process of keeping the temperature at 300-450 ℃ for 4 hours.
By adopting the production method of the high-chromium cast iron, the percentage (%) of each element in the range of the basic element components of the high-chromium cast iron Cr26 is as follows: 2.5-3.2, Si: 0.6 to 1.2, Mn: 0.8-1.8, S: less than or equal to 0.06, P: less than or equal to 0.1, Cr: 23-30, Mo: 0.3 to 0.5, Ni: 0.3 to 0.5, Cu: 0.1-0.2, and when producing Cr26 high-chromium cast iron with higher requirements on performance, the element composition is generally controlled in the following range (%) C: 2.5-3.2, Si: 0.6 to 1.2, Mn: 0.8-1.8, S: less than or equal to 0.06, P: less than or equal to 0.1, Cr: 23-30, Mo: 0.6 to 1.0, Ni: 0.7 to 1.0, Cu: 0.5-0.7, the contents of Mo, Ni and Cu in the high-chromium cast iron Cr26 are respectively reduced by 0.5 point, 0.5 point and 0.4 point, and the high-chromium cast iron has a market average value (120 yuan/kg of ferromolybdenum and molybdenum content) in recent years50 percent of nickel plate, 120 yuan/kg of nickel plate and 45 yuan/kg of waste red copper), the cost of per ton high-chromium cast iron is saved by 1980 yuan. The RABCY composite alterant has a market average price in recent years (FeSiRe29 is 24 yuan per kg, waste aluminum Al is 12.5 yuan per kg, FeB20C0.5 is 24 yuan per kg, Ca (OH)20.3 yuan per kg and 300 yuan per kg of metallic yttrium), the cost of each ton of material is only about 240 yuan. The cost is reduced and increased by adding or subtracting, so that the ton cost of the novel high-chromium cast iron is saved by 1740 yuan.
The embodiments of the present invention are described only for the preferred embodiments of the present invention, and not for the limitation of the concept and scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall into the protection scope of the present invention, and the technical content of the present invention which is claimed is fully set forth in the claims.
Claims (1)
1. The production method of the high-chromium cast iron is characterized by comprising the following steps:
(1) in the burdening and smelting process, the RABCY composite modifier is used for replacing Mo, Cu and Ni elements to refine the crystal grains of the high-chromium cast iron casting, and the adding amount of the RABCY composite modifier is 1.2-1.5 percent of the total weight of furnace burden;
r represents rare earth ferrosilicon FeSiRe29, A represents metal aluminum Al, B represents FeB20C0.5, C represents Ca (OH)2, and Y represents metal yttrium, the adding amount of each 100kg of furnace charge RABCY is respectively 0.1-0.3kg, 0.1-0.2kg, 0.001-0.004kg, 0.5-2.0kg and 0.04-0.08kg, the adding total amount is 1.2-1.5kg, wherein Ca (OH)2Placing the steel in the furnace bottom in advance, and adding the rest of the steel into the furnace 5 minutes before tapping;
(2) the traditional clay sand casting molding process is replaced by a casting molding process which uses a precoated sand shell mold for casting in the casting molding process and is assisted by high-frequency vibration during pouring;
(3) the quenching process of air cooling, gas cooling medium and wind speed sectional frequency conversion control is adopted to obtain the required structure of the high-chromium cast iron product and various high-quality properties of the product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610290800.0A CN107312902B (en) | 2016-04-27 | 2016-04-27 | Production method of high-chromium cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610290800.0A CN107312902B (en) | 2016-04-27 | 2016-04-27 | Production method of high-chromium cast iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107312902A CN107312902A (en) | 2017-11-03 |
| CN107312902B true CN107312902B (en) | 2020-05-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610290800.0A Expired - Fee Related CN107312902B (en) | 2016-04-27 | 2016-04-27 | Production method of high-chromium cast iron |
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| CN (1) | CN107312902B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111118256A (en) * | 2020-01-14 | 2020-05-08 | 马清杰 | Heat treatment process for high-chromium cast iron plate or hammer casting |
| CN112496289B (en) * | 2020-10-27 | 2022-08-16 | 株洲三联富润机械有限公司 | Solid-liquid bimetal wear-resistant anti-corrosion pumping pipeline and preparation method thereof |
| CN113718090A (en) * | 2021-09-02 | 2021-11-30 | 安徽海螺川崎装备制造有限公司 | Air quenching heat treatment process for high-chromium cast iron casting |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5882443A (en) * | 1996-06-28 | 1999-03-16 | Timminco Limited | Strontium-aluminum intermetallic alloy granules |
| CN101550518A (en) * | 2009-05-11 | 2009-10-07 | 西安国丰机械制造有限责任公司 | Boron-containing multi-element low alloy wear resistant cast steel and preparing method thereof |
| CN103757516B (en) * | 2014-01-09 | 2015-10-14 | 北京工业大学 | wear-resistant white cast iron and preparation method thereof |
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2016
- 2016-04-27 CN CN201610290800.0A patent/CN107312902B/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN107312902A (en) | 2017-11-03 |
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