CN101906565A - Carbide-containing ausferrite spheroidal graphite cast iron grinding ball and manufacturing method thereof - Google Patents
Carbide-containing ausferrite spheroidal graphite cast iron grinding ball and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a carbide-containing ausferrite spheroidal graphite cast iron grinding ball and a manufacturing method thereof, relating to a cast iron alloy containing spheroidal graphite. The grinding ball comprises the following chemical elements in percentage by mass: 3.3 to 3.7 percent of C, 2.4 to 3.3 percent of Si, 2.5 to 3.6 percent of Mn, 0.6 to 1.5 percent of Cr, less than 0.08 percent of P, less than 0.025 percent of S, 0.03 to 0.05 percent of Mg, 0.02 to 0.04 percent of Re and the balance of Fe. The preparation method of the grinding ball comprises the following steps of: (1) raw material preparation and smelting; (2) spheroidization and inoculation; and (3) isothermal quenching heat treatment. In the invention, a certain quantity of carbides and graphite balls are formed in a grinding ball casting-state structure by utilizing a sand lined metal casting technology; and an ausferrite base body with excellent comprehensive mechanical property is obtained by adopting an isothermal quenching technology; and as a certain quantity of carbides are distributed in the ausferrite base body, the carbide-containing ausferrite spheroidal graphite cast iron grinding ball has high wear resistance and toughness.
Description
Technical field
Technical scheme of the present invention relates to the cast iron alloy that contains spheroidal graphite, specifically carbide-containing ausferrite spheroidal graphite cast iron grinding ball and manufacture method thereof.
Background technology
Iron ore is the main raw material of ironmaking and steel-making, and in iron-making production, ore must pass through crushing grinding, surplus needing thus that the abrading-ball that consumes is annual and reaching 180 ten thousand tons.And the abrading-ball of metallurgical and mine industry consumption accounts for 70% of abrading-ball total amount consumed.How to improve metallurgical and the abrading-ball work-ing life of mine industry in iron-making production, to reduce production costs, be the problem that domestic and international research institution and manufacturing enterprise paid attention to always.
At present, the grinding ball material of using in industries such as metallurgy, mine and cement mainly contains forged steel abrading-ball, HI-chrome cast iron for grinding balls and low-chromium cast-iron grinding ball.Forged steel abrading-ball production efficiency height, toughness height, but hardness is lower, and wear resistance is relatively poor.The HI-chrome cast iron for grinding balls chrome content is 12～16%, matrix has two kinds of as cast condition troostite and quenched martensites, under dry grinding grinding abrasion working conditions such as coal-grinding powder and cement, shown good wear resistance, but under the wet-milling working condition of mine powdered iron ore, its wear resistance reduces greatly, because price is higher, do not demonstrate good cost performance in addition.The low-chromium cast-iron grinding ball chrome content is 1～3%, and its price higher chromium cast-iron grinding ball is low, but volume hardness is lower, and toughness is lower, and wear resistance is relatively poor, and the chip index height.
In recent years, domestic-developed several ductile iron grinding balls.CN1035138 discloses " manufacture method of austempering ductile iron abrading-ball ", the chemical ingredients of its abrading-ball is: 3.3-3.7%C, 2.2-2.6%Si, 0.4-0.7%Mn, P＜0.09%, adopt the technology of isothermal quenching to make abrading-ball, the good toughness of abrading-ball does not lose circle, percentage of damage low (＜0.06%), but, for the abrading-ball of diameter greater than 100mm, hardening capacity is lower, and there are three tissue regions in the abrading-ball section: the surface is bainite+austenite, transition layer is troostite+bainite, and heart portion is troostitic structures.This causes the abrading-ball Hardness Distribution inhomogeneous, and volume hardness reduces.CN1262338 has disclosed " martensite/bainite compounded cast iron abrading-ball and production method ", its chemical ingredients is: 3.4-3.8%C, 2.4-3.4%Si, 2.0-3.5%Mn, 0.1-0.5%Cr, 0.2-0.8%Cu, 0.003-0.03%B, P＜0.08%, S＜0.05%, its thermal treatment process are immediate quenching+tempering, when abrading-ball is cooled to 920-1000 ℃ in casting mold, unpack air cooling to 780-820 ℃, quench in the water glass solution, be cooled to 50-120 ℃, take out low-temperaturetempering, the shortcoming of this technology is that on-the-spot processing parameter is wayward, the mill ball quality instability.CN1944700 has reported " a kind of bainite ductile iron abrading-ball and manufacture craft thereof ", this technology utilization medium-frequency induction furnace melting is prepared ductile iron grinding ball in conjunction with vacuum-evaporative pattern casting, adopt the control thermal treatment process that abrading-ball is heat-treated to obtain the bainite heterogeneous structure then, carry out low-temperaturetempering at last, the shortcoming of this technology is that polystyrene foam cavityless casting abrading-ball is easy to generate black slag, vacuum dry sand consolidation, and speed of cooling is slow, abrading-ball volume hardness is low, wears no resistance.CN1134468 discloses " bainite ductile iron abrading-ball ", the continuous refrigerative mode of this process using sodium silicate solution is quenched to abrading-ball, and hardness is greater than HRC55, but the bainite structure instability that continuous cooling obtains, cause stable mechanical property poor, occur broken ball easily.
Summary of the invention
Technical problem to be solved by this invention is: carbide-containing ausferrite spheroidal graphite cast iron grinding ball and manufacture method thereof are provided, this method is utilized the sand-lined metal mold casting technique, in the abrading-ball as-cast structure, form the carbide and the graphite pebbles of some amount, then, pass through isothermal quenching technique, obtain the good iron body matrix difficult to understand of comprehensive mechanics, because the carbide of the some amount that distributing in the iron body matrix difficult to understand, therefore carbide-containing ausferrite spheroidal graphite cast iron grinding ball has high wear resistance and toughness, thereby it is wayward to have overcome in the prior art on-the-spot processing parameter, causes the mill ball quality instability; Polystyrene foam cavityless casting abrading-ball is easy to generate black slag, vacuum dry sand consolidation, and speed of cooling is slow, causes abrading-ball volume hardness low, wears no resistance; Continuously the bainite structure instability that obtains of cooling causes stable mechanical property poor, occurs broken ball easily and causes the abrading-ball Hardness Distribution inhomogeneous with the method for CN1035138, many shortcomings of volume hardness reduction.
The present invention solves this technical problem the technical scheme that is adopted: carbide-containing ausferrite spheroidal graphite cast iron grinding ball, the mass percent that its chemical element is formed is: 3.3～3.7%C, 2.4～3.3%Si, 2.5～3.6%Mn, 0.6～1.5%Cr, P＜0.08%, S＜0.025%, 0.03～0.05%Mg, 0.02～0.04%Re and all the other are Fe.
The metallographic structure of above-mentioned carbide-containing ausferrite spheroidal graphite cast iron grinding ball mainly is made up of iron body difficult to understand, carbide and graphite pebbles.
The metallographic structure of above-mentioned carbide-containing ausferrite spheroidal graphite cast iron grinding ball is made up of the martensite of iron body difficult to understand, carbide, graphite pebbles and trace.
The manufacture method of carbide-containing ausferrite spheroidal graphite cast iron grinding ball the steps include:
The first step, preparation of raw material and melting
By the mass percent of element is that 3.3～3.7%C, 2.4～3.3%Si, 2.5～3.6%Mn, 0.6～1.5%Cr, P＜0.08%, S＜0.025%, 0.03～0.05%Mg, 0.02～0.04%Re and all the other are Fe, preparation raw material, the raw material for preparing is put into medium-frequency induction furnace, be warming up to whole feed composition fusings, and being smelted into iron body spheroidal graphite cast iron original iron melt difficult to understand, tapping temperature is 1500～1550 ℃;
Second step, spheroidizing and inoculation
The first step is made the iron body spheroidal graphite cast iron original iron melt difficult to understand of coming out of the stove carry out spheroidizing and inoculation, it is that 5～7%Mg, 1～3%Re, 40～45%Si and all the other are the RE-Mg-ferrosilicon alloy of iron that nodulizing agent adopts the mass percent of elementary composition, and its add-on is 1.1～1.8% of an iron body spheroidal graphite cast iron original iron melt quality difficult to understand; It is 1～3%Ba, 70～75%Si and all the other ferrous alloy containing barium and silicons that contains for iron that nucleating agent adopts the mass percent of elementary composition, its add-on is 0.4～1.0% of an iron body spheroidal graphite cast iron original iron melt quality difficult to understand, then nodularization and the good iron body spheroidal graphite cast iron original iron melt difficult to understand of inoculation are poured in the sand-lined metal mold, make the pearlite matrix ductile iron grinding ball that contains graphite pebbles and carbide after this iron body spheroidal graphite cast iron original iron melt cooling difficult to understand of handling well, its carbide content is 5～25% of this abrading-ball total mass;
The 3rd step, isothermal quenching thermal treatment
The second pearlite matrix ductile iron grinding ball that contains graphite pebbles and carbide that make of step is heated to 880～950 ℃, is incubated 1～4 hour, quenching rapidly then into temperature is that 190～300 ℃ mass percent concentration is 50%NaNO
3+ mass percent concentration is 50%KNO
3In the nitrate solution, 1～5 hour hold-time, take out then and in air, be cooled to room temperature, finally make carbide-containing ausferrite spheroidal graphite cast iron grinding ball, the mass percent that its chemical element is formed is: 3.3～3.7%C, 2.4～3.3%Si, 2.5～3.6%Mn, 0.6～1.5%Cr, P＜0.08%, S＜0.025%, 0.03～0.05%Mg, 0.02～0.04%Re and all the other are Fe, and its metallographic structure mainly is made up of iron body difficult to understand, carbide and graphite pebbles;
In the manufacture method of above-mentioned carbide-containing ausferrite spheroidal graphite cast iron grinding ball, related per-cent is mass percent.
The manufacture method of above-mentioned carbide-containing ausferrite spheroidal graphite cast iron grinding ball finally makes carbide-containing ausferrite spheroidal graphite cast iron grinding ball, and its metallographic structure is made up of the martensite of iron body difficult to understand, carbide, graphite pebbles and trace.
In the manufacture method of above-mentioned carbide-containing ausferrite spheroidal graphite cast iron grinding ball, the obtained pearlite matrix ductile iron grinding ball that contains graphite pebbles and carbide of second step, its carbide content is to control by the mass percent cooperation between the two that used element chemistry composition in the thickness of layer of sand and the first step preparation raw material is covered in adjustment, when covering sand layer thickness is 3～5mm, when 1.0～1.5%Cr in the first step preparation raw material and 2.5～2.8%Si, the carbide content of this abrading-ball is 15～25%; When covering sand layer thickness is 6～9mm, and when 0.6～0.9%Cr in the first step preparation raw material and 2.8-3.5%Si, the carbide content of this abrading-ball is 5～15%.
The invention has the beneficial effects as follows: compare with the technology of existing ductile iron grinding ball and preparation method thereof, obvious improvement of the present invention is:
(1) the inventive method utilize sand-lined metal mold technology to improve to handle well iron body spheroidal graphite cast iron original iron melt crystallization difficult to understand the time speed of cooling, life-span that again can the protective money genotype, accurately control the content of carbide, improve number of graphite ball.
(2) the inventive method utilizes isothermal quenching technique to obtain iron body matrix difficult to understand, and its tissue distribution is even, helps improving the mechanical property of ductile iron grinding ball product.Evidence, the carbide-containing ausferrite spheroidal graphite cast iron grinding ball body impelling strength that the present invention makes is more than 3 times of HI-chrome cast iron for grinding balls, be 4～5 times of low-chromium cast-iron grinding ball, hardness is higher than HI-chrome cast iron for grinding balls and low-chromium cast-iron grinding ball, wear resistance is good, impact fatigue life-span height, not broken ball has improved the mill efficiency of ore.
(3) use the inventive method, the Hardness Distribution of the carbide-containing ausferrite spheroidal graphite cast iron grinding ball that process isothermal quenching thermal treatment makes as shown in Figure 2.Its volume hardness surpasses HRC57, and the impelling strength of abrading-ball body can reach 10J/cm
2More than, the abrading-ball of diameter 100mm, inside and outside difference of hardness is less than HRC3.Show that abrading-ball is not broken through fall sphere test, its ball falling impact fatigue lifetime is above 10000 times.
The further detailed proof of following embodiment beneficial effect of the present invention.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
The metallographic structure figure of the carbide-containing ausferrite spheroidal graphite cast iron grinding ball that Fig. 1 makes with the inventive method.
The diameter that Fig. 2 makes with the inventive method is the hardness distribution of the carbide-containing ausferrite spheroidal graphite cast iron grinding ball of 100mm.
Embodiment
Embodiment 1
The first step, preparation of raw material and melting
By the mass percent of element be 3.6%C, 2.5%Si, 2.5%Mn, 0.6%Cr,＜0.07%P,＜0.025%S, 0.04%Mg, 0.03%Re and all the other are Fe, preparation raw material, the raw material for preparing is put into medium-frequency induction furnace, be warming up to whole feed composition fusings and be smelted into iron body spheroidal graphite cast iron original iron melt difficult to understand, tapping temperature is 1500 ℃;
Second step, spheroidizing and inoculation
The first step is made the iron body spheroidal graphite cast iron original iron melt difficult to understand of coming out of the stove carry out spheroidizing and inoculation, it is that 5～7%Mg, 1～3%Re, 40～45%Si and all the other are the RE-Mg-ferrosilicon alloy of iron that nodulizing agent adopts the mass percent of elementary composition, and its add-on is the weight percent 1.4% of iron body spheroidal graphite cast iron original iron melt weight difficult to understand; It is 1～3%Ba that nucleating agent adopts the mass percent of elementary composition, 70～75%Si and all the other contain for iron that ferrous alloy containing barium and silicon is surplus to be the RE-Mg-ferrosilicon alloy of iron, its add-on is the weight percent 0.7% of iron body spheroidal graphite cast iron original iron melt weight difficult to understand, then nodularization and the good iron body spheroidal graphite cast iron original iron melt difficult to understand of inoculation are poured into and cover in the sand-lined metal mold that sand layer thickness is 6～9mm, make the pearlite matrix ductile iron grinding ball that contains graphite pebbles and carbide after this iron body spheroidal graphite cast iron original iron melt cooling difficult to understand of handling well, its carbide content is the per-cent 10% of this abrading-ball total mass, as-cast metallographic structure's analysis revealed, matrix are perlite;
The 3rd step, isothermal quenching thermal treatment
The second pearlite matrix ductile iron grinding ball that contains graphite pebbles and carbide that make of step is heated to 900 ℃, is incubated 2 hours, quenching rapidly then into temperature is that 190～240 ℃ mass percent concentration is 50%NaNO
3+ mass percent concentration is 50%KNO
3In the nitrate solution, 2～4 hours hold-times, take out then and in air, be cooled to room temperature, finally make carbide-containing ausferrite spheroidal graphite cast iron grinding ball, the mass percent that its chemical element is formed is: 3.6%C, 2.5%Si, 2.5%Mn, 0.6%Cr,＜0.07%P,＜0.025%S, 0.04%Mg, 0.03%Re and all the other are Fe, the metallographic structure of this abrading-ball mainly is made up of iron body difficult to understand, carbide and graphite pebbles.The volume hardness HRC58.8 of this abrading-ball, the impelling strength of abrading-ball body reaches 10.2J/cm
2, ball falling impact reaches 10450 times fatigue lifetime.
Embodiment 2
The first step, preparation of raw material and melting
By the mass percent of element be 3.7%C, 3.2%Si, 3.5%Mn, 1.5%Cr,＜0.06%P,＜0.025%S, 0.03%Mg, 0.02%Re and all the other are Fe, preparation raw material, the raw material for preparing is put into medium-frequency induction furnace, be warming up to whole feed composition fusings and be smelted into iron body spheroidal graphite cast iron original iron melt difficult to understand, tapping temperature is 1550 ℃;
Second step, spheroidizing and inoculation
The first step is made the iron body spheroidal graphite cast iron original iron melt difficult to understand of coming out of the stove carry out spheroidizing and inoculation, it is that 5～7%Mg, 1～3%Re, 40～45%Si and all the other are the RE-Mg-ferrosilicon alloy of iron that nodulizing agent adopts the mass percent of elementary composition, and its add-on is the weight percent 1.8% of iron body spheroidal graphite cast iron original iron melt weight difficult to understand; It is 1～3%Ba that nucleating agent adopts the mass percent of elementary composition, 70～75%Si and all the other contain for iron that ferrous alloy containing barium and silicon is surplus to be the RE-Mg-ferrosilicon alloy of iron, its add-on is the weight percent 0.4% of iron body spheroidal graphite cast iron original iron melt weight difficult to understand, then nodularization and the good iron body spheroidal graphite cast iron original iron melt difficult to understand of inoculation are poured into and cover in the sand-lined metal mold that sand layer thickness is 3～5mm, make the pearlite matrix ductile iron grinding ball that contains graphite pebbles and carbide after this iron body spheroidal graphite cast iron original iron melt cooling difficult to understand of handling well, its carbide content is the per-cent 25% of this abrading-ball total mass, as-cast metallographic structure's analysis revealed, matrix are perlite;
The 3rd step, isothermal quenching thermal treatment
The second pearlite matrix ductile iron grinding ball that contains graphite pebbles and carbide that make of step is heated to 950 ℃, is incubated 1 hour, quenching rapidly then into temperature is that 240～260 ℃ mass percent concentration is 50%NaNO
3+ mass percent concentration is 50%KNO
3In the nitrate solution, 1～3 hour hold-time, take out then and in air, be cooled to room temperature, finally make carbide-containing ausferrite spheroidal graphite cast iron grinding ball, the mass percent that its chemical element is formed is: 3.7%C, 3.2%Si, 3.5%Mn, 1.5%Cr,＜0.06%P,＜0.025%S, 0.03%Mg, 0.02%Re and all the other are Fe, the metallographic structure of this abrading-ball mainly is made up of iron body difficult to understand, carbide and graphite pebbles.The volume hardness HRC57.9 of this abrading-ball, the impelling strength of abrading-ball body reaches 11.2J/cm
2, ball falling impact reaches 10780 times fatigue lifetime.
Embodiment 3
The first step, preparation of raw material and melting
By the mass percent of element be 3.4%C, 3.0%Si, 2.8%Mn, 1.0%Cr,＜0.08%P,＜0.022%S, 0.05%Mg, 0.04%Re and all the other are Fe, preparation raw material, the raw material for preparing is put into medium-frequency induction furnace, be warming up to whole feed composition fusings and be smelted into iron body spheroidal graphite cast iron original iron melt difficult to understand, tapping temperature is 1520 ℃;
Second step, spheroidizing and inoculation
The first step is made the iron body spheroidal graphite cast iron original iron melt difficult to understand of coming out of the stove carry out spheroidizing and inoculation, it is that 5～7%Mg, 1～3%Re, 40～45%Si and all the other are the RE-Mg-ferrosilicon alloy of iron that nodulizing agent adopts the mass percent of elementary composition, and its add-on is the weight percent 1.15% of iron body spheroidal graphite cast iron original iron melt weight difficult to understand; It is 1～3%Ba that nucleating agent adopts the mass percent of elementary composition, 70～75%Si and all the other contain for iron that ferrous alloy containing barium and silicon is surplus to be the RE-Mg-ferrosilicon alloy of iron, its add-on is the weight percent 1.0% of iron body spheroidal graphite cast iron original iron melt weight difficult to understand, then nodularization and the good iron body spheroidal graphite cast iron original iron melt difficult to understand of inoculation are poured into and cover in the sand-lined metal mold that sand layer thickness is 6～9mm, make the pearlite matrix ductile iron grinding ball that contains graphite pebbles and carbide after this iron body spheroidal graphite cast iron original iron melt cooling difficult to understand of handling well, its carbide content is the per-cent 5% of this abrading-ball total mass, as-cast metallographic structure's analysis revealed, matrix are perlite;
The 3rd step, isothermal quenching thermal treatment
The second pearlite matrix ductile iron grinding ball that contains graphite pebbles and carbide that make of step is heated to 880 ℃, is incubated 4 hours, quenching rapidly then into temperature is that 260～300 ℃ mass percent concentration is 50%NaNO
3+ mass percent concentration is 50%KNO
3In the nitrate solution, 3～5 hours hold-times, take out then and in air, be cooled to room temperature, finally make carbide-containing ausferrite spheroidal graphite cast iron grinding ball, the mass percent that its chemical element is formed is: 3.4%C, 3.0%Si, 2.8%Mn, 1.0%Cr,＜0.08%P,＜0.022%S, 0.05%Mg, 0.04%Re and all the other are Fe, the metallographic structure of this abrading-ball mainly is made up of iron body difficult to understand, carbide and graphite pebbles.The volume hardness HRC57.1 of this abrading-ball, the impelling strength of abrading-ball body can reach 12.5J/cm
2, ball falling impact reaches 11006 times fatigue lifetime.
Fig. 1 shows in the above-described embodiments, mainly is made up of iron body difficult to understand, carbide and graphite pebbles through the metallographic structure of the prepared carbide-containing ausferrite spheroidal graphite cast iron grinding ball of isothermal quenching thermal treatment, also contains the martensite of trace.
Fig. 2 shows the Hardness Distribution of the carbide iron body difficult to understand ductile iron grinding ball that makes through isothermal quenching thermal treatment in the foregoing description.These abrading-ball volume hardness surpass HRC57, and the impelling strength of body can reach 10J/cm
2More than.The inside and outside difference of hardness of the abrading-ball of diameter 100mm is less than HRC3.Show that its ball falling impact fatigue lifetime is above 10000 times through fall sphere test.
Claims (6)
1. carbide-containing ausferrite spheroidal graphite cast iron grinding ball is characterized in that: the mass percent that its chemical element is formed is: 3.3～3.7%C, 2.4～3.3%Si, 2.5～3.6%Mn, 0.6～1.5%Cr, P＜0.08%, S＜0.025%, 0.03～0.05%Mg, 0.02～0.04%Re and all the other are Fe.
2. carbide-containing ausferrite spheroidal graphite cast iron grinding ball according to claim 1 is characterized in that: the metallographic structure of this abrading-ball mainly is made up of iron body difficult to understand, carbide and graphite pebbles.
3. carbide-containing ausferrite spheroidal graphite cast iron grinding ball according to claim 1 and 2 is characterized in that: the metallographic structure of this abrading-ball is made up of the martensite of iron body difficult to understand, carbide, graphite pebbles and trace.
4. the preparation method of carbide-containing ausferrite spheroidal graphite cast iron grinding ball is characterized in that: the steps include:
The first step, preparation of raw material and melting
By the mass percent of element is that 3.3～3.7%C, 2.4～3.3%Si, 2.5～3.6%Mn, 0.6～1.5%Cr, P＜0.08%, S＜0.025%, 0.03～0.05%Mg, 0.02～0.04%Re and all the other are Fe, preparation raw material, the raw material for preparing is put into medium-frequency induction furnace, be warming up to whole feed composition fusings, and being smelted into iron body spheroidal graphite cast iron original iron melt difficult to understand, tapping temperature is 1500～1550 ℃;
Second step, spheroidizing and inoculation
The first step is made the iron body spheroidal graphite cast iron original iron melt difficult to understand of coming out of the stove carry out spheroidizing and inoculation, it is that 5～7%Mg, 1～3%Re, 40～45%Si and all the other are the RE-Mg-ferrosilicon alloy of iron that nodulizing agent adopts the mass percent of elementary composition, and its add-on is 1.1～1.8% of an iron body spheroidal graphite cast iron original iron melt quality difficult to understand; It is 1～3%Ba, 70～75%Si and all the other ferrous alloy containing barium and silicons that contains for iron that nucleating agent adopts the mass percent of elementary composition, its add-on is 0.4～1.0% of an iron body spheroidal graphite cast iron original iron melt quality difficult to understand, then nodularization and the good iron body spheroidal graphite cast iron original iron melt difficult to understand of inoculation are poured in the sand-lined metal mold, make the pearlite matrix ductile iron grinding ball that contains graphite pebbles and carbide after this iron body spheroidal graphite cast iron original iron melt cooling difficult to understand of handling well, its carbide content is 5～25% of this abrading-ball total mass;
The 3rd step, isothermal quenching thermal treatment
The second pearlite matrix ductile iron grinding ball that contains graphite pebbles and carbide that make of step is heated to 880～950 ℃, is incubated 1～4 hour, quenching rapidly then into temperature is that 190～300 ℃ mass percent concentration is 50%NaNO
3+ mass percent concentration is 50%KNO
3In the nitrate solution, 1～5 hour hold-time, take out then and in air, be cooled to room temperature, finally make carbide-containing ausferrite spheroidal graphite cast iron grinding ball, the mass percent that its chemical element is formed is: 3.3～3.7%C, 2.4～3.3%Si, 2.5～3.6%Mn, 0.6～1.5%Cr, P＜0.08%, S＜0.025%, 0.03～0.05%Mg, 0.02～0.04%Re and all the other are Fe, and its metallographic structure mainly is made up of iron body difficult to understand, carbide and graphite pebbles;
In the manufacture method of above-mentioned carbide-containing ausferrite spheroidal graphite cast iron grinding ball, related per-cent is mass percent.
5. the preparation method of carbide-containing ausferrite spheroidal graphite cast iron grinding ball according to claim 4 is characterized in that: finally make carbide-containing ausferrite spheroidal graphite cast iron grinding ball, its metallographic structure is made up of the martensite of iron body difficult to understand, carbide, graphite pebbles and trace.
6. the preparation method of carbide-containing ausferrite spheroidal graphite cast iron grinding ball according to claim 4, it is characterized in that: the obtained pearlite matrix ductile iron grinding ball that contains graphite pebbles and carbide of second step, its carbide content is to control by the mass percent cooperation between the two that used element chemistry composition in the thickness of layer of sand and the first step preparation raw material is covered in adjustment, when covering sand layer thickness is 3～5mm, when 1.0～1.5%Cr in the first step preparation raw material and 2.5～2.8%Si, the carbide content of this abrading-ball is 15～25%; When covering sand layer thickness is 6～9mm, and when 0.6～0.9%Cr in the first step preparation raw material and 2.8-3.5%Si, the carbide content of this abrading-ball is 5～15%.
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| CN102011044A (en) * | 2010-12-15 | 2011-04-13 | 安徽省宁国耐磨配件总厂 | Continuous-casting martensitic spheroidal graphite cast iron lining plate and machining process thereof |
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| US5246510A (en) * | 1992-06-01 | 1993-09-21 | Applied Process | Method for producing a selectively surface hardened cast iron part |
| CN1102669C (en) * | 1999-01-28 | 2003-03-05 | 北京科技大学 | Grinding ball of martensite/bainite compounded cast iron and its production technology |
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