CN110592467A - Low-chromium alloy grinding ball and processing technology thereof - Google Patents
Low-chromium alloy grinding ball and processing technology thereof Download PDFInfo
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- 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
- C21D5/04—Heat treatments of cast-iron of white cast-iron
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C37/00—Cast-iron alloys
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Abstract
The invention provides a low-chromium alloy grinding ball and a processing technology thereof, relating to the technical field of low-chromium alloy, wherein the grinding ball comprises the following chemical components in percentage by mass: 3.2 to 4.1 percent of C, 1.5 to 2.6 percent of Cr, 0.3 to 0.8 percent of Mn, 0.4 to 0.9 percent of Si, 2.5 to 5.4 percent of Ni, 0.78 to 1.06 percent of B, 0.08 to 0.21 percent of Mo, 0.004 to 0.009 percent of Ta, 0.36 to 0.61 percent of Zn, 0.11 to 0.56 percent of Nb, 0.007 to 0.012 percent of W, 0.02 to 0.05 percent of V, 0.02 percent of P, 0.02 percent of S, and the balance of Fe and inevitable impurities. The grinding ball prepared by smelting, modification, casting and heat treatment has good impact resistance and wear resistance and higher hardness.
Description
Technical Field
The invention relates to the technical field of low-chromium alloy, in particular to a low-chromium alloy grinding ball and a processing technology thereof.
Background
The wear-resistant ball is a grinding medium widely applied to ball mills in the industries of metallurgical mines, cement building materials, thermal power generation, flue gas desulfurization, magnetic materials, chemical engineering, coal water slurry, pellet ore, slag, ultrafine powder, fly ash, calcium carbonate, quartz sand and the like, and is used for grinding materials in the ball mills, wherein one of the grinding media is white cast iron which takes chromium as a main alloy element and is called chromium alloy cast iron for short, and a casting grinding ball which takes the chromium alloy cast iron as a material is called chromium alloy cast iron grinding ball. The structure of the common white cast iron is ledeburite, and the common white cast iron has the characteristics of poor toughness, large brittleness, poor wear resistance and the like, and the function of chromium in the white cast iron can be embodied in the following two aspects: promote the formation of carbide, change the structure, performance and form of the carbide; solid solution in austenite changes the phase change property of austenite. According to the difference of chromium content, the chromium white cast iron is classified into low-chromium white cast iron, medium-chromium white cast iron, and high-chromium white cast iron.
The low-chromium white cast iron has the structure that the carbide is M3The C-type carbide basically keeps the network structure of cementite in the Fe-C alloy. The matrix structure of the low-chromium white cast iron in an as-cast state is coarse pearlite and has the characteristics of low hardness, poor toughness and no wear resistance, so that the wear-resistant ball has good impact resistance and wear resistance by adjusting the element formula in the wear-resistant ball according to the actual requirement of the wear-resistant ball and assisting a specific processing technology, a heat treatment technology and the like, and the technical problem to be solved at present in the field of high hardness is the technical problem to be solved urgently.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a low-chromium alloy grinding ball and a processing technology thereof, so that the wear-resistant ball has good impact resistance and wear resistance and higher hardness.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme:
the low-chromium alloy grinding ball comprises the following chemical components in percentage by mass: 3.2 to 4.1 percent of C, 1.5 to 2.6 percent of Cr, 0.3 to 0.8 percent of Mn, 0.4 to 0.9 percent of Si, 2.5 to 5.4 percent of Ni, 0.78 to 1.06 percent of B, 0.08 to 0.21 percent of Mo, 0.004 to 0.009 percent of Ta0.004 to 0.009 percent of Zn, 0.36 to 0.61 percent of Nb, 0.11 to 0.56 percent of Nb, 0.007 to 0.012 percent of W, 0.02 to 0.05 percent of V, 0.02 percent of P, 0.02 percent of S, and the balance of Fe and inevitable impurities.
Preferably, the chemical components are as follows by mass percent: 3.5 to 3.8 percent of C, 1.8 to 2.4 percent of Cr, 0.5 to 0.7 percent of Mn, 0.5 to 0.7 percent of Si, 3.2 to 4.1 percent of Ni, 0.88 to 0.93 percent of B, 0.12 to 0.16 percent of Mo, 0.005 to 0.007 percent of Ta, 0.44 to 0.53 percent of Zn, 0.28 to 0.36 percent of Nb, 0.009 to 0.011 percent of W, 0.03 to 0.04 percent of V, 0.02 percent of P, 0.02 percent of S, and the balance of Fe and inevitable impurities.
Preferably, the chemical components are as follows by mass percent: 3.6% of C, 2.1% of Cr, 0.6% of Mn, 0.6% of Si, 3.5% of Ni, 0.92% of B, 0.14% of Mo, 0.006% of Ta, 0.46% of Zn, 0.32% of Nb, 0.01% of W, 0.04% of V, less than 0.02% of P, less than 0.02% of S, and the balance of Fe and inevitable impurities.
The processing technology of the low-chromium alloy grinding ball comprises the following steps:
1) smelting: the raw materials calculated according to the proportion are put into a medium-frequency induction control furnace for smelting, the smelting temperature is 1540-1580 ℃, after the raw materials are completely molten, a slag skimming agent and a slag remover prepared from silicon, calcium and aluminum in a mass ratio of 1: 2: 1, removing impurities such as oxygen, phosphorus, sulfur and the like in the alloy liquid, and controlling the tapping temperature to 1570-;
2) modification treatment: crushing yttrium-based rare earth to the particle size of 1-3mm, drying at about 200-;
3) pouring: pouring the alloy liquid subjected to modification treatment at 1460-1490 ℃ to obtain a primary grinding ball;
4) and (3) heat treatment: and sequentially carrying out primary quenching, tempering, laser melting and laser quenching processes on the primary grinding ball to obtain the low-chromium alloy grinding ball.
Further, the primary quenching process specifically comprises the following steps: the temperature of the grinding ball is raised to 810-880 ℃ at the temperature rising rate of 160 ℃/h of 140-.
Further, the tempering process specifically comprises the following steps: raising the temperature of the grinding ball subjected to primary quenching treatment to 405-420 ℃ at the heating rate of 40-60 ℃/h, preserving the temperature for 6-8h, and naturally cooling to room temperature.
Further, the laser fusing process specifically comprises the following steps: and carrying out laser fusion treatment on the surface of the grinding ball by adopting laser under an argon atmosphere, wherein the peak power of the square wave is 800-1200W, the pulse frequency is 80-120HZ, the duty ratio is 0.4-0.7, the average laser power is 800-1000W, and the scanning speed is 11-13 mm/s.
Further, the laser quenching process specifically comprises the following steps: and performing laser quenching treatment on the surface of the grinding ball by adopting laser, wherein the laser power is 700-800W, the scanning speed is 25-35mm/s, the focal length is 320-340mm, and the defocusing amount is 35-45 mm.
(III) advantageous effects
The invention provides a low-chromium alloy grinding ball and a processing technology thereof, firstly, the component formula of the grinding ball is optimized, and elements such as manganese, silicon, nickel, boron, molybdenum and the like are combined in proper amount and are cooperated with each other, so that the grain boundary can be purified, the grains can be refined, the carbide content can be controlled and the like, and the grinding ball has excellent hardness, toughness and wear resistance. Meanwhile, in the heat treatment process, an oil quenching mode is selected to be more favorable for improving the wear resistance of the magic ball, the grinding ball is subjected to primary quenching and tempering treatment by selecting proper temperature rise rate, quenching temperature and tempering temperature, so that the metallographic structure in the grinding ball is uniform, and after the grinding ball is treated by the laser melting and laser quenching process, the quenching layer of the grinding ball is fine acicular martensite, so that the quenching layer has high hardness and good toughness, the treatment enables the wear resistance and the toughness of the grinding ball to be perfectly combined, the hardness and the wear resistance of the whole grinding ball are further improved, and the service life of the grinding ball is greatly prolonged.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the low-chromium alloy grinding ball comprises the following chemical components in percentage by mass: 3.6% of C, 2.1% of Cr, 0.6% of Mn, 0.6% of Si, 3.5% of Ni, 0.92% of B, 0.14% of Mo, 0.006% of Ta, 0.46% of Zn, 0.32% of Nb, 0.01% of W, 0.04% of V, less than 0.02% of P, less than 0.02% of S, and the balance of Fe and inevitable impurities.
The processing technology of the low-chromium alloy grinding ball comprises the following steps:
1) smelting: the raw materials calculated according to the proportion are put into a medium-frequency induction control furnace for smelting, the smelting temperature is 1560 ℃, after the raw materials are completely smelted, a slag skimming agent and a slag remover prepared from silicon, calcium and aluminum according to the mass ratio of 1: 2: 1, removing impurities such as oxygen, phosphorus, sulfur and the like in the alloy liquid, and controlling the tapping temperature to be 1580 ℃ to obtain the alloy liquid;
2) modification treatment: crushing yttrium-based rare earth to the particle size of 2mm, drying at about 210 ℃, placing at the bottom of a casting ladle, and pouring alloy liquid into the casting ladle for modification treatment at 1560 ℃ for 15 min;
3) pouring: pouring the alloy liquid after modification at 1480 ℃ to obtain a primary grinding ball;
4) and (3) heat treatment: and sequentially carrying out primary quenching, tempering, laser melting and laser quenching processes on the primary grinding ball to obtain the low-chromium alloy grinding ball. Wherein, the primary quenching process specifically comprises the following steps: heating the grinding ball to 850 ℃ at the heating rate of 150 ℃/h, preserving heat for 4h, and then performing oil quenching in quenching oil with the oil temperature of 140 ℃, wherein the quenching time is 18 min; the tempering process specifically comprises the following steps: heating the grinding ball subjected to primary quenching treatment to 410 ℃ at a heating rate of 50 ℃/h, preserving heat for 8h, and naturally cooling to room temperature; the laser fusing process specifically comprises the following steps: performing laser fusing treatment on the surface of the grinding ball by adopting laser in an argon atmosphere, wherein the peak power of a square wave is 1000W, the pulse frequency is 100HZ, the duty ratio is 0.5, the average laser power is 900W, and the scanning speed is 12 mm/s; the laser quenching process comprises the following specific steps: and carrying out laser quenching treatment on the surface of the grinding ball by adopting laser, wherein the laser power is 750W, the scanning speed is 30mm/s, the focal length is 330mm, and the defocusing amount is 40 mm.
Example 2:
the low-chromium alloy grinding ball comprises the following chemical components in percentage by mass: 3.2% of C, 2.4% of Cr, 0.3% of Mn, 0.7% of Si, 2.5% of Ni, 0.93% of B, 0.08% of Mo, 0.007% of Ta, 0.36% of Zn, 0.36% of Nb, 0.007% of W, 0.04% of V, less than 0.02% of P, less than 0.02% of S, and the balance of Fe and inevitable impurities.
The processing technology of the low-chromium alloy grinding ball comprises the following steps:
1) smelting: putting raw materials calculated according to a proportion into a medium-frequency induction control furnace for smelting, wherein the smelting temperature is 1540 ℃, and after the raw materials are completely molten, adding a slag removing agent and a slag remover consisting of silicon, calcium and aluminum according to a mass ratio of 1: 2: 1, removing impurities such as oxygen, phosphorus, sulfur and the like in the alloy liquid, and controlling the tapping temperature to 1570 ℃ to obtain the alloy liquid;
2) modification treatment: crushing yttrium-based rare earth to the particle size of 1mm, drying at about 200 ℃, placing at the bottom of a casting ladle, pouring alloy liquid into the casting ladle for modification treatment at 1550 ℃ for 12 min;
3) pouring: pouring the alloy liquid after modification at 1460 deg.C to obtain primary grinding ball;
4) and (3) heat treatment: and sequentially carrying out primary quenching, tempering, laser melting and laser quenching processes on the primary grinding ball to obtain the low-chromium alloy grinding ball. Wherein, the primary quenching process specifically comprises the following steps: heating the grinding ball to 820 ℃ at the heating rate of 160 ℃/h, preserving heat for 3h, and then performing oil quenching in quenching oil with the oil temperature of 140 ℃, wherein the quenching time is 20 min; the tempering process specifically comprises the following steps: heating the grinding ball subjected to primary quenching treatment to 405 ℃ at a heating rate of 40 ℃/h, preserving heat for 6h, and naturally cooling to room temperature; the laser fusing process specifically comprises the following steps: performing laser fusing treatment on the surface of the grinding ball by adopting laser in an argon atmosphere, wherein the peak power of a square wave is 800W, the pulse frequency is 90HZ, the duty ratio is 0.6, the average laser power is 900W, and the scanning speed is 13 mm/s; the laser quenching process comprises the following specific steps: and carrying out laser quenching treatment on the surface of the grinding ball by adopting laser, wherein the laser power is 800W, the scanning speed is 25mm/s, the focal length is 340mm, and the defocusing amount is 35 mm.
Example 3:
the low-chromium alloy grinding ball comprises the following chemical components in percentage by mass: 4.1% of C, 1.8% of Cr, 0.8% of Mn, 0.5% of Si, 5.4% of Ni, 0.88% of B, 0.21% of Mo, 0.005% of Ta, 0.61% of Zn, 0.28% of Nb, 0.012% of W, 0.03% of V, less than 0.02% of P, less than 0.02% of S, and the balance of Fe and inevitable impurities.
The processing technology of the low-chromium alloy grinding ball comprises the following steps:
1) smelting: the raw materials calculated according to the proportion are put into a medium-frequency induction control furnace for smelting, the smelting temperature is 1550 ℃, after the raw materials are completely smelted, a slag removing agent and a slag remover prepared from silicon, calcium and aluminum are added into the furnace according to the mass ratio of 1: 2: 1, removing impurities such as oxygen, phosphorus, sulfur and the like in the alloy liquid, and controlling the tapping temperature to be 1600 ℃ to obtain the alloy liquid;
2) modification treatment: crushing yttrium-based rare earth to the particle size of 1mm, drying at about 200 ℃, placing at the bottom of a ladle, pouring alloy liquid into the ladle for modification treatment at 1580 ℃ for 10 min;
3) pouring: pouring the alloy liquid subjected to modification treatment at the pouring temperature of 1490 ℃ to obtain primary grinding balls;
4) and (3) heat treatment: and sequentially carrying out primary quenching, tempering, laser melting and laser quenching processes on the primary grinding ball to obtain the low-chromium alloy grinding ball. Wherein, the primary quenching process specifically comprises the following steps: heating the grinding balls to 810 ℃ at a heating rate of 155 ℃/h, preserving heat for 3h, and then performing oil quenching in quenching oil with the oil temperature of 130 ℃, wherein the quenching time is 17 min; the tempering process specifically comprises the following steps: heating the grinding ball subjected to primary quenching treatment to 415 ℃ at a heating rate of 50 ℃/h, preserving heat for 7h, and naturally cooling to room temperature; the laser fusing process specifically comprises the following steps: performing laser fusing treatment on the surface of the grinding ball by adopting laser in an argon atmosphere, wherein the peak power of a square wave is 900W, the pulse frequency is 80HZ, the duty ratio is 0.7, the average laser power is 800W, and the scanning speed is 11 mm/s; the laser quenching process comprises the following specific steps: and carrying out laser quenching treatment on the surface of the grinding ball by adopting laser, wherein the laser power is 740W, the scanning speed is 28mm/s, the focal length is 320mm, and the defocusing amount is 45 mm.
Example 4:
the low-chromium alloy grinding ball comprises the following chemical components in percentage by mass: 3.5% of C, 2.6% of Cr, 0.5% of Mn, 0.9% of Si, 3.2% of Ni, 1.06% of B, 0.12% of Mo, 0.009% of Ta, 0.44% of Zn, 0.56% of Nb, 0.009% of W, 0.05% of V, less than 0.02% of P, less than 0.02% of S, and the balance of Fe and inevitable impurities.
The processing technology of the low-chromium alloy grinding ball comprises the following steps:
1) smelting: the raw materials calculated according to the proportion are put into a medium-frequency induction control furnace for smelting at 1580 ℃, after the raw materials are completely smelted, a slag skimming agent and a slag remover prepared from silicon, calcium and aluminum in a mass ratio of 1: 2: 1, removing impurities such as oxygen, phosphorus, sulfur and the like in the alloy liquid, and controlling the tapping temperature to 1590 ℃ to obtain the alloy liquid;
2) modification treatment: crushing yttrium-based rare earth to the particle size of 3mm, drying at about 210 ℃, placing at the bottom of a casting ladle, and pouring alloy liquid into the casting ladle for modification treatment at 1590 ℃ for 11 min;
3) pouring: pouring the alloy liquid after modification at 1470 ℃ to obtain primary grinding balls;
4) and (3) heat treatment: and sequentially carrying out primary quenching, tempering, laser melting and laser quenching processes on the primary grinding ball to obtain the low-chromium alloy grinding ball. Wherein, the primary quenching process specifically comprises the following steps: heating the grinding ball to 880 ℃ at the heating rate of 145 ℃/h, preserving heat for 2h, and then performing oil quenching in quenching oil with the oil temperature of 120 ℃, wherein the quenching time is 16 min; the tempering process specifically comprises the following steps: heating the grinding ball subjected to primary quenching treatment to 420 ℃ at a heating rate of 60 ℃/h, preserving the temperature for 7h, and naturally cooling to room temperature; the laser fusing process specifically comprises the following steps: performing laser fusing treatment on the surface of the grinding ball by adopting laser under argon atmosphere, wherein the peak power of a square wave is 1200W, the pulse frequency is 120HZ, the duty ratio is 0.7, the average laser power is 850W, and the scanning speed is 11 mm/s; the laser quenching process comprises the following specific steps: and carrying out laser quenching treatment on the surface of the grinding ball by adopting laser, wherein the laser power is 700W, the scanning speed is 35mm/s, the focal length is 330mm, and the defocusing amount is 36 mm.
Example 5:
the low-chromium alloy grinding ball comprises the following chemical components in percentage by mass: 3.8% of C, 1.5% of Cr, 0.7% of Mn, 0.4% of Si, 4.1% of Ni, 0.78% of B, 0.16% of Mo, 0.004% of Ta, 0.53% of Zn, 0.11% of Nb, 0.011% of W, 0.02% of V, less than 0.02% of P, less than 0.02% of S, and the balance of Fe and inevitable impurities.
The processing technology of the low-chromium alloy grinding ball comprises the following steps:
1) smelting: the raw materials calculated according to the proportion are put into a medium-frequency induction control furnace for smelting, the smelting temperature is 1570 ℃, after the raw materials are completely molten, a slag skimming agent and a slag remover prepared from silicon, calcium and aluminum in a mass ratio of 1: 2: 1, removing impurities such as oxygen, phosphorus, sulfur and the like in the alloy liquid, and controlling the tapping temperature to be 1610 ℃ to obtain the alloy liquid;
2) modification treatment: crushing yttrium-based rare earth to the particle size of 2mm, drying at about 220 ℃, placing at the bottom of a casting ladle, pouring alloy liquid into the casting ladle for modification treatment at 1570 ℃ for 13 min;
3) pouring: pouring the alloy liquid after modification at 1480 ℃ to obtain a primary grinding ball;
4) and (3) heat treatment: and sequentially carrying out primary quenching, tempering, laser melting and laser quenching processes on the primary grinding ball to obtain the low-chromium alloy grinding ball. Wherein, the primary quenching process specifically comprises the following steps: heating the grinding balls to 860 ℃ at a heating rate of 140 ℃/h, preserving heat for 4h, and then performing oil quenching in quenching oil with the oil temperature of 130 ℃, wherein the quenching time is 18 min; the tempering process specifically comprises the following steps: heating the grinding ball subjected to primary quenching treatment to 415 ℃ at a heating rate of 55 ℃/h, preserving heat for 6h, and naturally cooling to room temperature; the laser fusing process specifically comprises the following steps: performing laser fusing treatment on the surface of the grinding ball by adopting laser in an argon atmosphere, wherein the peak power of a square wave is 1100W, the pulse frequency is 110HZ, the duty ratio is 0.6, the average laser power is 1000W, and the scanning speed is 12 mm/s; the laser quenching process comprises the following specific steps: and carrying out laser quenching treatment on the surface of the grinding ball by adopting laser, wherein the laser power is 770W, the scanning speed is 33mm/s, the focal length is 340mm, and the defocusing amount is 42 mm.
The results of various performance tests on the high chromium alloy grinding balls prepared in examples 1 to 5 of the present invention are shown in Table 1.
Table 1:
| hardness (HRC) | Impact toughness (J/cm)2) | Number of impact resistance times | |
| Example 1 | 68 | 19.5 | ≥28000 |
| Example 2 | 67 | 18.7 | ≥28000 |
| Example 3 | 66 | 18.4 | ≥28000 |
| Example 4 | 64 | 19.1 | ≥28000 |
| Example 5 | 66 | 18.3 | ≥28000 |
In summary, the embodiment of the invention has the following beneficial effects: the grinding balls prepared in examples 1-5 of the present invention have excellent hardness, toughness, wear resistance and long service life.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. The low-chromium alloy grinding ball is characterized by comprising the following chemical components in percentage by mass: 3.2 to 4.1 percent of C, 1.5 to 2.6 percent of Cr, 0.3 to 0.8 percent of Mn, 0.4 to 0.9 percent of Si, 2.5 to 5.4 percent of Ni, 0.78 to 1.06 percent of B, 0.08 to 0.21 percent of Mo, 0.004 to 0.009 percent of Ta, 0.36 to 0.61 percent of Zn, 0.11 to 0.56 percent of Nb, 0.007 to 0.012 percent of W, 0.02 to 0.05 percent of V, 0.02 percent of P, 0.02 percent of S, and the balance of Fe and inevitable impurities.
2. The low chromium alloy grinding ball according to claim 1, wherein the chemical composition comprises, in mass percent: 3.5 to 3.8 percent of C, 1.8 to 2.4 percent of Cr, 0.5 to 0.7 percent of Mn, 0.5 to 0.7 percent of Si, 3.2 to 4.1 percent of Ni, 0.88 to 0.93 percent of B, 0.12 to 0.16 percent of Mo, 0.005 to 0.007 percent of Ta, 0.44 to 0.53 percent of Zn, 0.28 to 0.36 percent of Nb, 0.009 to 0.011 percent of W, 0.03 to 0.04 percent of V, 0.02 percent of P, 0.02 percent of S, and the balance of Fe and inevitable impurities.
3. The low chromium alloy grinding ball according to claim 2, wherein the chemical composition comprises, in mass percent: 3.6% of C, 2.1% of Cr, 0.6% of Mn, 0.6% of Si, 3.5% of Ni, 0.92% of B, 0.14% of Mo, 0.006% of Ta, 0.46% of Zn0.32% of Nb, 0.01% of W, 0.04% of V, 0.02% of P, 0.02% of S, and the balance of Fe and inevitable impurities.
4. A process for manufacturing a low chromium alloy grinding ball according to any one of claims 1 to 3, comprising the steps of:
1) smelting: the raw materials calculated according to the proportion are put into a medium-frequency induction control furnace for smelting, the smelting temperature is 1540-1580 ℃, after the raw materials are completely molten, a slag skimming agent and a slag remover prepared from silicon, calcium and aluminum in a mass ratio of 1: 2: 1, removing impurities such as oxygen, phosphorus, sulfur and the like in the alloy liquid, and controlling the tapping temperature to 1570-;
2) modification treatment: crushing yttrium-based rare earth to the particle size of 1-3mm, drying at about 200-;
3) pouring: pouring the alloy liquid subjected to modification treatment at 1460-1490 ℃ to obtain a primary grinding ball;
4) and (3) heat treatment: and sequentially carrying out primary quenching, tempering, laser melting and laser quenching processes on the primary grinding ball to obtain the low-chromium alloy grinding ball.
5. The processing technology of the low-chromium alloy grinding ball as claimed in claim 4, wherein the primary quenching technology in the step 4) is specifically as follows: the temperature of the grinding ball is raised to 810-880 ℃ at the temperature rising rate of 160 ℃/h of 140-.
6. The processing technology of the low-chromium alloy grinding ball as claimed in claim 4, wherein the tempering technology in the step 4) is specifically as follows: raising the temperature of the grinding ball subjected to primary quenching treatment to 405-420 ℃ at the heating rate of 40-60 ℃/h, preserving the temperature for 6-8h, and naturally cooling to room temperature.
7. The process for machining a low-chromium alloy grinding ball according to claim 4, wherein the laser fusing process in the step 4) is specifically as follows: and carrying out laser fusion treatment on the surface of the grinding ball by adopting laser under an argon atmosphere, wherein the peak power of the square wave is 800-1200W, the pulse frequency is 80-120HZ, the duty ratio is 0.4-0.7, the average laser power is 800-1000W, and the scanning speed is 11-13 mm/s.
8. The processing technology of the low-chromium alloy grinding ball according to claim 4, wherein the laser quenching technology in the step 4) is specifically as follows: and performing laser quenching treatment on the surface of the grinding ball by adopting laser, wherein the laser power is 700-800W, the scanning speed is 25-35mm/s, the focal length is 320-340mm, and the defocusing amount is 35-45 mm.
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| CN111485164A (en) * | 2020-06-08 | 2020-08-04 | 马鞍山常裕机械设备有限公司 | Casting method for enhancing wear resistance of low-chromium alloy casting |
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| SU927860A1 (en) * | 1979-07-26 | 1982-05-15 | Институт проблем литья АН УССР | Cast iron composition |
| CN1598030A (en) * | 2004-07-26 | 2005-03-23 | 江苏共昌轧辊有限公司 | Improved nickel chromium molybdenum inlimited cold hard cast-iron for roller and its compound roller |
| CN101121996A (en) * | 2007-09-21 | 2008-02-13 | 武汉钢铁(集团)公司 | Outer layer material used for centrifugal roller |
| CN101864533A (en) * | 2010-05-14 | 2010-10-20 | 宁国市南洋铁球有限公司 | Grinding ball specialized for mine |
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| CN103074539A (en) * | 2013-01-07 | 2013-05-01 | 鞍钢重型机械有限责任公司 | Centrifugal composite high-nickel-niobium wear-resisting cast iron roll and casting method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111485164A (en) * | 2020-06-08 | 2020-08-04 | 马鞍山常裕机械设备有限公司 | Casting method for enhancing wear resistance of low-chromium alloy casting |
| CN111485164B (en) * | 2020-06-08 | 2021-05-14 | 马鞍山常裕机械设备有限公司 | Casting method for enhancing wear resistance of low-chromium alloy casting |
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| CN110592467B (en) | 2021-04-20 |
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Denomination of invention: A low chromium alloy grinding ball and its processing technology Effective date of registration: 20210820 Granted publication date: 20210420 Pledgee: Hanshan sub branch of China Construction Bank Corporation Pledgor: MAANSHAN CHANGYU MACHINERY EQUIPMENT Co.,Ltd. Registration number: Y2021980008032 |