CN102443741B - Manufacturing method for steel ball for ball mill - Google Patents

Manufacturing method for steel ball for ball mill Download PDF

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Publication number
CN102443741B
CN102443741B CN2011103608570A CN201110360857A CN102443741B CN 102443741 B CN102443741 B CN 102443741B CN 2011103608570 A CN2011103608570 A CN 2011103608570A CN 201110360857 A CN201110360857 A CN 201110360857A CN 102443741 B CN102443741 B CN 102443741B
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steel ball
steel
ball base
ball
temperature
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CN2011103608570A
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Chinese (zh)
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CN102443741A (en
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谭仕荣
刘泓平
王俊
邹明
韩振宇
张小雯
娄绍春
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攀钢集团工程技术有限公司
攀钢集团攀枝花钢铁研究院有限公司
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Abstract

The invention discloses a steel ball for a ball mill and a manufacturing method for the same. The method for manufacturing the steel ball for a ball mill comprises the following steps of: smelting molten steel; treating the molten steel by an external refining technique to obtain the molten steel composed of 0.90-1.00% of C, 0.30-1.00% of Si, 0.80-1.20% of Mn, 0.40-0.70% of Cr, 0.01-0.05% of Ti, not greater than 0.025% of P, not greater than 0.025% of S, the balance of Fe and inevitable impurities in percentage by weight; casting; rolling; cutting to form a steel ball blank; heating the steel ball blank, and then forging; quenching, tempering, and then performing air-cooling and finishing treatments to obtain a steel ball. The steel ball for a ball mill disclosed by the invention is high in wear resistance, good in strength and toughness, unable to break round and be out of round during a service process, and long in service life.

Description

The manufacture method that is used for the steel ball of ball mill
Technical field
The present invention relates to ferrous metallurgy and field shaping technique, more particularly, relate to a kind of for the good obdurability of having of ball mill and wear resistance and low steel ball and the manufacture method thereof of production cost.
Background technology
At present, ball mill is the major equipment of for example, in numerous industrial circles (, mining, metallurgy, coal, building materials, chemical industry, electric power etc.) comminuted solids material.Steel ball is as the important grinding component in ball mill, and the quality of its performance will directly determine quality and the grinding efficiency of powder.For example, in mining or field of metallurgy, in process of lapping, ball mill is by the shock between steel ball and ore and friction repeatedly, by ore reduction.In order to improve the durability of crushing efficiency and steel ball, need steel ball surface that enough hardness and fastness to rubbing are arranged.Simultaneously, in process of lapping, the collision occurred between steel ball and abrasive material, steel ball and liner plate and steel ball and steel ball is inevitable, therefore, also requires steel ball that certain toughness is arranged, and avoids brokenly ball.The Working environment of steel ball has determined that traditional As rolled steel ball is difficult to meet the demands, and need carry out quench treatment to steel ball, to improve hardness; Simultaneously, for eliminating the inner excessive internal stress of hardened steel ball, need carry out temper to steel ball.Current, along with the fast development of world steel industry, soaring year by year to the demand of the raw materials such as ore.The data demonstration, 2010, only mineral processing in China industry steel ball consumption was just over 2,000,000 tons.Therefore, development high-performance steel ball product, particularly diameter are not less than the steel ball of 80mm, reduce unit consumption, and raising steel ball quality and work-ing life are significant.
In the prior art, for avoiding steel ball crisp matter phase cementite to occur, in quenching and use procedure, ftracture, the carbon contents that adopt in the design below 0.90% more, simultaneously for improving hardening capacity and the toughness and tenacity of steel ball, when improving Si, Mn content, add in a large number the precious alloy elements such as Cr, Mo, Cu, Ni, Al, cause the steel ball cost significantly to increase on the one hand; On the other hand, close full element and also can't evade deleterious effect in the performance advantageous effect, for example too high Cr will increase the fragility of steel, in steel, contain Cu and be easy to cause steel ball rolling and quenching process cracking etc., exist certain not enough.
Therefore, need a kind of low cost of manufacture badly and have simultaneously the ball mill steel ball product of good obdurability and abrasion resistance properties, to meet the industrial requirement of ball-milling processing.
Summary of the invention
For above shortcomings in prior art, the present invention is optimized design to chemical composition and the preparation technology of ball mill steel ball, thereby has obtained a kind of ball mill steel ball with good obdurability and abrasion resistance properties while low production cost.Ball mill steel ball of the present invention can be widely used in the ball milling field of large-scale ferrous and nonferrous metals.
An aspect of of the present present invention provides a kind of steel ball for ball mill, the chemical composition of described steel ball for ball mill by weight percentage by the Fe of 0.90%~1.00% C, 0.30%~1.00% Si, 0.80%~1.20% Mn, 0.40%~0.70% Cr, 0.01%~0.05% Ti, no more than 0.025% P, no more than 0.025% S, surplus and inevitably impurity form.
Another aspect of the present invention provides a kind of method of manufacturing ball mill steel ball, and described method comprises the following steps of carrying out successively: smelting molten steel; Adopt furnace outer refining process to process molten steel, the molten steel obtained by weight percentage by the Fe of 0.90%~1.00% C, 0.30%~1.00% Si, 0.80%~1.20% Mn, 0.40%~0.70% Cr, 0.01%~0.05% Ti, no more than 0.025% P, no more than 0.025% S, surplus and inevitably impurity form; Casting is to form strand; Heating strand, then rolling; The strand of cutting after rolling, form the steel ball base; The steel ball base is heated to 900 ℃~950 ℃ and be incubated 15min~25min, then the steel ball base is heated to rapidly to 1100 ℃~1150 ℃, the forged steel ball base; By the steel ball base air cooling to 780 after forging ℃~820 ℃, then the steel ball base be take to the mode of continuous rolling at the quenching-in water of temperature as 30 ℃~50 ℃, after steel ball base skin temperature is 80 ℃~140 ℃, again the steel ball base is placed in to temperature and is the mechanical blazing-off of 200 ℃~240 ℃, after tempering 3h~6h, take out, carry out subsequently air cooling and finishing and process, obtain steel ball.
The method of manufacture ball mill steel ball according to a further aspect of the invention, wherein, the step that described employing furnace outer refining process is processed molten steel comprises ladle refining operation and the vacuum circulation degassing operation of carrying out successively.
The method of manufacture ball mill steel ball according to a further aspect of the invention, wherein, the described heating steel ball base then step of forged steel ball base is, by burning coal gas, the steel ball base is heated to 900 ℃~950 ℃, then adopts intermediate frequency or line-frequency induction heating that the steel ball base is heated to rapidly to 1100 ℃~1150 ℃.
The method of manufacture ball mill steel ball according to a further aspect of the invention, wherein, describedly the steel ball base be take to the mode of continuous rolling in temperature, by snakelike route or path with predetermined slope, make the steel ball base realize continuous rolling as the step of the quenching-in water of 30 ℃~50 ℃.
The method of manufacture ball mill steel ball according to a further aspect of the invention, wherein, described temperature is that the water of 30 ℃~50 ℃ is connected with water circulation cooling device or heat abstractor, remains in the scope of 30 ℃~50 ℃ to guarantee that water temperature is constant.
The method of manufacture ball mill steel ball according to a further aspect of the invention, wherein, described method also can be included in the heating strand and then before the step of rolling, casting billet surface is cooled to the step that then adopts the flame cleaning surface defect of bloom below 100 ℃.
Compared with prior art, ball mill steel ball of the present invention has good obdurability index and wear resisting property, simultaneously, adds V, Mo, the precious alloy elements such as Cu, Ni owing to not adopting, production cost significantly reduces, and basically can partly substitute the high alloy steel ball used in ball mill.
Embodiment
Hereinafter, in connection with exemplary embodiment, the steel ball for ball mill of the present invention and manufacture method thereof are described.
The chemical composition of the steel ball for ball mill according to an aspect of the present invention by weight percentage by the Fe of 0.90%~1.00% C, 0.30%~1.00% Si, 0.80%~1.20% Mn, 0.40%~0.70% Cr, 0.01%~0.05% Ti, no more than 0.025% P, no more than 0.025% S, surplus and inevitably impurity form.Preferably, the chemical composition of the steel ball for ball mill of the present invention by weight percentage by the Fe of 0.90%~0.95% C, 0.50%~0.80% Si, 0.90%~1.10% Mn, 0.50%~0.65% Cr, 0.02%~0.04% Ti, no more than 0.025% P, no more than 0.025% S, surplus and inevitably impurity form.
Below, illustrate that at first the chemical composition according to ball mill steel ball of the present invention is limited to the reason of above-mentioned scope.
The C element is that to make steel ball obtain a kind of most important of suitable intensity, hardness and wear resisting property be also the most cheap element.In steel ball according to the present invention, under the prerequisite of not adding the precious alloy elements such as Mo, Cu, Ni, Al, when C content was less than 0.90%, the abrasion resistance properties of steel ball was difficult to significantly improve, and crossed quick-wearing in causing using, and reduced work-ing life.Even so, surpass the C of eutectoid content (0.77%) ftractures in quenching process proneness still stronger.For this reason, in steel, add Ti element and the medium carbide forming element Cr element that produces tiny TiC particle with C, coordinate simultaneously heating and thermal treatment process in the present invention, avoid the hardening break phenomenon.Simultaneously, add particularly impelling strength of toughness plasticity that the Ti element also helps to improve steel ball.When C content was greater than 1.00%, the steel ball strong hardness was had a surplus and the toughness plasticity deficiency, can't meet service requirements.Therefore, in the present invention, C content is limited between 0.90%~1.00%, and as preferred scheme, C content is limited between 0.90%~0.95%.
The Si element, as the main adding elements of steel, can be present in ferrite and austenite with the solid solution form, thereby improves the intensity of organizing in steel.According in steel ball of the present invention, when in steel, Si content is less than 0.30%, solid solution capacity is on the low side will cause strengthening effect not obvious; Simultaneously, be unfavorable for the reduction of opposing hardness in drawing process, particularly be unfavorable for major diameter steel ball realization sclerosis comprehensively; When Si content is greater than 1.00%, by plasticity and the ductility of steel are reduced, be unfavorable for the enforcement of forging process.Therefore, in the present invention, Si content is limited between 0.30%~1.00%.As preferred scheme, Si content is limited between 0.50%~0.80%.
The Mn element can form sosoloid with Fe, improves ferrite and austenitic intensity, simultaneously, can improve the hardening capacity of steel, reduces the difference of hardness of steel ball top layer and heart section.When Mn content was less than 0.80%, strengthening effect was undesirable, for the major diameter steel ball, and the heart section of can't hardening in quenching process; When Mn content was greater than 1.20%, Mn enters cementite can partly substitute the Fe atom, increased the hardness of carbide, will cause strong having a surplus of steel ball and the tough deficiency of moulding, the work-ing life that is unfavorable for improving steel ball.Therefore, in steel ball of the present invention, Mn content is limited between 0.80%~1.20%.As preferred scheme, Mn content is limited between 0.90%~1.10%.
The Cr element can form continuous solid solution and can form multiple carbide with C with Fe, is one of alloy strengthening element commonly used in steel, compares with V, Nb, Cu, Ni, Mo, and the advantage of Cr maximum is that cost is low.The evenly distribution of carbide in steel of Cr, improve the polishing machine of steel; Simultaneously, Cr can significantly improve the hardening capacity of steel ball, is conducive to reduce the gap of steel ball heart section and surface hardness.In addition, Cr can also improve the erosion resistance of steel ball, significant with the wet method abrading-ball for mine.When Cr content was less than 0.40%, its effect in steel was limited, and steel ball can't obtain higher polishing machine; When Cr content is greater than 0.70%, by worsening the toughness of steel ball, in use be prone to brokenly ball.Therefore, in steel ball of the present invention, Cr content is limited between 0.40%~0.70%.As preferred scheme, Cr content is limited between 0.50%~0.65%.
The Main Function of Ti element in steel is refinement in heating, rolling and austenitic crystal grain when cooling, final toughness plasticity and the rigidity that increases tissue.In steel ball according to the present invention, when Ti content was greater than 0.05%, on the one hand because Ti is strong carbonitride forming element, the TiC/TiN of the generation ball hardness that will make on the high side was too high; On the other hand, TiC/TiN on the high side forms thick carbide by the segregation enrichment, and this not only reduces toughness plasticity, also makes steel ball contact surface under impact loading be easy to ftracture and cause breaking.In steel ball according to the present invention, when Ti content was less than 0.01%, the carbonitride limited amount of formation, be difficult to play a role.Therefore, in steel ball of the present invention, Ti content is limited between 0.01%~0.05%.As preferred scheme, Ti content is limited between 0.02%~0.04%.
The method of manufacture ball mill steel ball according to a further aspect of the invention comprises the following steps of carrying out successively: smelting molten steel; Adopt furnace outer refining process to process molten steel, the molten steel obtained by weight percentage by the Fe of 0.90%~1.00% C, 0.30%~1.00% Si, 0.80%~1.20% Mn, 0.40%~0.70% Cr, 0.01%~0.05% Ti, no more than 0.025% P, no more than 0.025% S, surplus and inevitably impurity form; Casting is to form strand; Heating strand, then rolling; The strand of cutting after rolling, form the steel ball base; The steel ball base is heated to 900 ℃~950 ℃ and be incubated 15min~25min, then the steel ball base is heated to rapidly to 1100 ℃~1150 ℃, the forged steel ball base; By the steel ball base air cooling to 780 after forging ℃~820 ℃, then the steel ball base be take to the mode of continuous rolling at the quenching-in water of temperature as 30 ℃~50 ℃, after steel ball base skin temperature is 80 ℃~140 ℃, again the steel ball base is placed in to temperature and is the mechanical blazing-off of 200 ℃~240 ℃, after tempering 3h~6h, take out, carry out subsequently air cooling and finishing and process, obtain steel ball.
In one example, the method for manufacture ball mill steel ball of the present invention also can realize by the following steps of carrying out successively:
1. smelting molten steel
Adopt converter or electric furnace to carry out smelting molten steel.
2. the outer LF stove refining of stove and vacuum-treat
Converter or electric furnace steel tapping are delivered to ladle refining furnace (that is, the LF stove) heating after by stove rear platform Argon, stirring, and regulate liquid steel temperature, adjust chemical composition, reduce harmful element content in molten steel.After reaching target value, vacuum degassing furnace (that is, the RH stove) vacuum-treat is sent in departures, further adjusts chemical composition, reduces elemental gas content in steel.The composition that finally obtains molten steel is: the Fe of 0.90%~1.00% C, 0.30%~1.00% Si, 0.80%~1.20% Mn, 0.40%~0.70% Cr, 0.01%~0.05% Ti, no more than 0.025% P, no more than 0.025% S, surplus and inevitable impurity.
3. square billet casting and strand cleaning
By meet above-mentioned steps 2. the molten steel of described chemical composition deliver to six machine six stream caster machines and cast, by scale requirement cutting strand, adopt the flame cleaning surface imperfection after below strand slow cooling to 100 ℃.
4. square steel rolling
Adopt walking beam furnace that strand is heated to 1200 ℃~1300 ℃, after the insulation certain hour, adopting 950,800 or 850 milling trains is 60mm * 60mm~80mm * 80mm square steel by the strand rolling, and presses the rear air cooling of scale cutting to room temperature.
5. steel ball base blanking
Adopt plasma cutting machine, according to the steel ball specification, square steel is processed into to the steel ball base, during blanking, consider approximately 3% the loss caused because of oxide skin etc.
6. the steel ball base is carried out to two sections laser heatings
So-called two sections laser heatings refer to, adopt coal gas slowly to be heated to its austenite phase region temperature the steel ball base, be generally 900 ℃~950 ℃, insulation is taken out after 15min~25min, takes out after then adopting rapidly intermediate frequency or line-frequency induction heating unit that the steel ball base is heated to 1100 ℃~1150 ℃ and forges.
Adopt two sections laser heatings to have following beneficial effect.At first, autstenitic grain size has remarkably influenced to martensitic transformation, and in heat-processed, austenite crystal is grown up with the rising of holding temperature and the prolongation of soaking time, and during temperature, grain growth is not obvious near Heating temperature is in the austenite phase region.Therefore, at this section, adopt the slowly mode of heating of coal gas; When temperature continue to improve, grain growth was obvious, adopted the mode of induction heating to avoid that crystal grain is excessive brings disadvantageous effect to final steel ball performance.On the other hand, the purpose of adding the Ti element in steel is similarly avoids growing up of austenite crystal, and the C in Ti and steel, N form the carbonitride of tiny Ti, are distributed on austenitic matrix to disperse, also can avoid grain growth, and crystal grain thinning improves the steel ball performance.In addition, because C content in the present invention is higher, if adopt coal gas slowly to be warming up to the heating means of 1150 ℃ always, to cause in process of cooling producing cementite intercrystalline precipitation, because cementite is crisp matter phase, in use, the cementite segregation will become weak link, take the lead in ftractureing and finally causing steel ball to break, can't use.Therefore, high temperature section adopt fast technique of burning to suppress cementite to separate out effect remarkable.If the steel ball base adopts the mode of induction heating from room temperature state always, on the one hand, because induction heating need consume a large amount of electric energy, the steel ball production cost significantly increases; On the other hand, the characteristics of induction heating are to heat up rapidly in top layer, reach centre of sphere position by the heat transmission, if centre of sphere position and skin temperature are inhomogeneous, will cause the stress distribution inequality, are unfavorable for the raising of the performance of the enforcement of forging process and final steel ball.
7. forged steel ball
The high temperature steel ball is taken out to be placed in and forge on stand, adopt 200kg~500kg air forging hammer to become steel ball according to required specification die forging, forging process need guarantee the each several part homogeneous deformation.
8. steel ball is quenched
Usually, the final forging temperature of steel ball can be about 950 ℃.Yet for the different size steel ball, final forging temperature is difference to some extent.Steel ball is placed in to air cooling on porose stand, when skin temperature is down between 780 ℃~820 ℃, drops into temperature and be in the clear water of 30 ℃~50 ℃ and quench.For guaranteeing uniform quenching, avoid the gasification because of water around steel ball to reduce speed of cooling, the hardening groove need be furnished with water circulation cooling device or heat abstractor, remains in the scope of 30 ℃~50 ℃ to guarantee water temperature.If water temperature higher than 50 ℃, causes ball hardness on the low side, can't meet service requirements; If water temperature is lower than 30 ℃, steel ball easily breaks.Simultaneously, the walking path of steel ball in water need have certain slope, slowly rolls continuously to guarantee steel ball.If place is limited, also can adopt snakelike route.When the steel ball skin temperature is down to 80 ℃~140 ℃ by steel ball from water, taking out.In water, the steel ball skin temperature can obtain in several ways.For example, in water, the steel ball skin temperature can be determined according to the corresponding relation that is determined by experiment under these conditions cool time and steel ball skin temperature.
9. steel ball is carried out to tempering
Steel ball after taking-up, because centre of sphere position temperature is higher, can be realized the self-tempering effect, by steel ball be placed in rapidly temperature be 200~240 ℃ machinery oil (for example, 50~100# machinery oil) tempering in, tempering time is 3h~6h, avoids the cracking phenomena of steel ball because quenching and producing, and causes useless ball.
10. steel ball finishing
Tempered processing air cooling to the steel ball of room temperature is carried out to removing surface, broken ball are selected etc. and namely obtain finished product steel ball.
Below, in connection with concrete example, the present invention is described in more detail.
Example 1
Adopt the converter smelting molten steel, after then carrying out the refining of LF stove, vacuum-treat, billet continuous casting, strand cleaning, strand heating, square steel rolling and scale sawing, obtain the steel ball base.The concrete composition of steel ball base is: C:0.94%, Si:0.75%, Mn:1.00%, Cr:0.62%, Ti:0.022%, P:0.022%, the Fe of S:0.024% and surplus and inevitable impurity.Adopt gas-fired furnace by the steel ball blank slowly be warming up to 920 ℃ and be incubated 18min after take out, carry out rapidly line-frequency induction and be heated to 1110 ℃, then to become diameter be the steel ball of 80mm in die forging.When the steel ball skin temperature is down to 800 ℃, drop in 38 ℃ of clear water after rolling quenching 70s (now, surface temperature is 120 ℃), drop into rapidly the 50# machinery blazing-off of 220 ℃, tempering time 4h, then, take out finishing by steel ball.Through check, the surface hardness of the steel ball of this example is 62~64HRC, and centre of sphere hardness is 53~55HRC, and 1/2 radius non-notch impact value is 13J, and centre of sphere position impact value is 15J, and the wear resisting property of corresponding iron ore abrasion is that 410 grams/ton (that is, g/t).
Example 2
Adopt the converter smelting molten steel, then carry out the refining of LF stove, vacuum-treat, billet continuous casting, strand cleaning, strand heating, square steel rolling and scale sawing after, obtain the steel ball base.The concrete composition of steel ball base is: C:0.91%, Si:0.65%, Mn:0.95%, Cr:0.60%, Ti:0.020%, P:0.025%, S:0.022%, the Fe of [H]: 2.0ppm and surplus and inevitable impurity.Adopt gas-fired furnace by the steel ball blank slowly be warming up to 900 ℃ and be incubated 20min after take out, carry out rapidly line-frequency induction and be heated to 1150 ℃, then to become diameter be the steel ball of 100mm in die forging.When the steel ball skin temperature is down to 800 ℃, drop in 40 ℃ of clear water after rolling quenching 90s (now, 105 ℃ of surface temperatures), drop into rapidly the 50# machinery blazing-off of 220 ℃, tempering time 4h, then, take out finishing by steel ball.Through check, the surface hardness of the steel ball of this example is 60~63HRC, and centre of sphere hardness is 52~54HRC, and 1/2 radius non-notch impact value is 13J, and centre of sphere position impact value is 15J, and the wear resisting property of corresponding iron ore abrasion is 419g/t.
Example 3
Adopt the converter smelting molten steel, then carry out the refining of LF stove, vacuum-treat, billet continuous casting, strand cleaning, strand heating, square steel rolling and scale sawing after, obtain the steel ball base.The concrete composition of steel ball base is: C:0.99%, Si:0.35%, Mn:1.18%, Cr:0.68%, Ti:0.048%, P:0.020%, S:0.025%, the Fe of [H]: 2.0ppm and surplus and inevitable impurity.Adopt gas-fired furnace by the steel ball blank slowly be warming up to 950 ℃ and be incubated 25min after take out, carry out rapidly line-frequency induction and be heated to 1130 ℃, then to become diameter be the steel ball of 120mm in die forging.When the steel ball skin temperature is down to 820 ℃, drop in 45 ℃ of clear water after rolling quenching 115s (now, 120 ℃ of surface temperatures), take out the 100# machinery blazing-off that drops into rapidly 200 ℃, tempering time 6h, then, take out finishing by steel ball.Through check, the surface hardness of the steel ball of this example is 60~62HRC, and centre of sphere hardness is 50~51HRC, and 1/2 radius non-notch impact value is 12J, and centre of sphere position impact value is 13J, and the wear resisting property of corresponding iron ore abrasion is 421g/t.
Example 4
Adopt the converter smelting molten steel, then carry out the refining of LF stove, vacuum-treat, billet continuous casting, strand cleaning, strand heating, square steel rolling and scale sawing after, obtain the steel ball base.The concrete composition of steel ball base is: C:0.90%, Si:0.78%, Mn:0.95%, Cr:0.55%, Ti:0.025%, P:0.020%, S:0.025%, the Fe of [H]: 2.0ppm and surplus and inevitable impurity.Adopt gas-fired furnace by the steel ball blank slowly be warming up to 940 ℃ and be incubated 18min after take out, carry out rapidly line-frequency induction and be heated to 1130 ℃, then to become diameter be the steel ball of 80mm in die forging.When the steel ball skin temperature is down to 810 ℃, throw in 40 ℃ of clear water after rolling quenching 65s (now, 125 ℃ of surface temperatures), drop into rapidly the 50# machinery blazing-off of 220 ℃, tempering time 4h, then, take out finishing by steel ball.Through check, the surface hardness of the steel ball of this example is 61~63HRC, and centre of sphere hardness is 52~55HRC, and 1/2 radius non-notch impact value is 14J, and centre of sphere position impact value is 15J, and the wear resisting property assay is 432g/t (corresponding iron ore abrasion).
Example 5
Adopt the converter smelting molten steel, then carry out the refining of LF stove, vacuum-treat, billet continuous casting, strand cleaning, strand heating, square steel rolling and scale sawing after, obtain the steel ball base.The concrete composition of steel ball base is: C:0.91%, Si:0.32%, Mn:0.83%, Cr:0.42%, Ti:0.012%, P:0.020%, S:0.025%, the Fe of [H]: 2.0ppm and surplus and inevitable impurity.Adopt gas-fired furnace by the steel ball blank slowly be warming up to 920 ℃ and be incubated 15min after take out, carry out rapidly line-frequency induction and be heated to 1100 ℃, then to become diameter be the steel ball of 100mm in die forging.When the steel ball skin temperature is down to 784 ℃, drops in 32 ℃ of clear water and take out after rolling quenching 105s (now, 83 ℃ of surface temperatures), drop into rapidly the 50# machinery blazing-off of 200 ℃, tempering time 6h, then, take out finishing by steel ball.Through check, the surface hardness of the steel ball of this example is 60~64HRC, and centre of sphere hardness is 52~54HRC, and 1/2 radius non-notch impact value is 12J, and centre of sphere position impact value is 14J, and the wear resisting property assay is 408g/t (corresponding iron ore abrasion).
Example 6
Adopt the converter smelting molten steel, then carry out the refining of LF stove, vacuum-treat, billet continuous casting, strand cleaning, strand heating, square steel rolling and scale sawing after, obtain the steel ball base.The concrete composition of steel ball base is: C:0.90%, Si:0.72%, Mn:1.02%, Cr:0.60%, Ti:0.018%, P:0.025%, S:0.025%, the Fe of [H]: 2.0ppm and surplus and inevitable impurity.Adopt gas-fired furnace by the steel ball blank slowly be warming up to 900 ℃ and be incubated 20min after take out, carry out rapidly line-frequency induction and be heated to 1150 ℃, then to become diameter be the steel ball of 120mm in die forging.When the steel ball skin temperature is down to 800 ℃, drops in 45 ℃ of clear water and take out after rolling quenching 110s (now, 118 ℃ of surface temperatures), drop into rapidly the 50# machinery blazing-off of 240 ℃, tempering time 3h, then, take out finishing by steel ball.Through check, the surface hardness of the steel ball of this example is 59~62HRC, and centre of sphere hardness is 51~53HRC, and 1/2 radius non-notch impact value is 14J, and centre of sphere position impact value is 15J, and the wear resisting property assay is 434g/t (corresponding iron ore abrasion).
In sum, the present invention is by improving the carbon content in steel ball, adopt the technical measures of Cr, Ti combined microalloying, coordinate simultaneously distinctive two sections laser heatings and quenching mode, overcome because carbon content raises and caused the easy to crack and top layer cementite of steel ball quenching to be separated out affecting the steel ball difficult point in work-ing life, realized the stably manufactured of steel ball.Steel ball of the present invention has good obdurability index and wear resisting property, and simultaneously, owing to not adopting and adding V, Mo, the precious alloy elements such as Cu, Ni, production cost significantly reduces, and basically can partly substitute the high alloy steel ball, has obtained good effect.In addition, steel ball wear resistance of the present invention is high, does not in use break circle, does not lose circle, long service life.
Although the above has described steel ball of the present invention with steel and manufactured the method for this steel ball in conjunction with example, it will be apparent to those skilled in the art that and can carry out various modifications to above description in the situation that do not break away from the spirit and scope that claim limits.

Claims (6)

1. method of manufacturing ball mill steel ball, described method comprises the following steps of carrying out successively:
Smelting molten steel;
Adopt furnace outer refining process to process molten steel, the molten steel obtained by weight percentage by the Fe of 0.90%~1.00% C, 0.30%~1.00% Si, 0.80%~1.20% Mn, 0.40%~0.70% Cr, 0.01%~0.05% Ti, no more than 0.025% P, no more than 0.025% S, surplus and inevitably impurity form;
Casting is to form strand;
Heating strand, then rolling;
The strand of cutting after rolling, form the steel ball base;
The steel ball base is heated to 900 ℃~950 ℃ and be incubated 15min~25min, then the steel ball base is heated to rapidly to 1100 ℃~1150 ℃, the forged steel ball base;
By the steel ball base air cooling to 780 after forging ℃~820 ℃, then the steel ball base be take to the mode of continuous rolling at the quenching-in water of temperature as 30 ℃~50 ℃, after steel ball base skin temperature is 80 ℃~140 ℃, again the steel ball base is placed in to temperature and is the mechanical blazing-off of 200 ℃~240 ℃, after tempering 3h~6h, take out, carry out subsequently air cooling and finishing and process, obtain steel ball.
2. the method for manufacture ball mill steel ball according to claim 1, is characterized in that, the step that described employing furnace outer refining process is processed molten steel comprises ladle refining operation and the vacuum circulation degassing operation of carrying out successively.
3. the method for manufacture ball mill steel ball according to claim 1, it is characterized in that, the described heating steel ball base then step of forged steel ball base is, by burning coal gas, the steel ball base is heated to 900 ℃~950 ℃, then adopts intermediate frequency or line-frequency induction heating that the steel ball base is heated to rapidly to 1100 ℃~1150 ℃.
4. the method for manufacture ball mill steel ball according to claim 1, it is characterized in that, describedly the steel ball base be take to the mode of continuous rolling in temperature, by snakelike route or path with predetermined slope, make the steel ball base realize continuous rolling as the step of the quenching-in water of 30 ℃~50 ℃.
5. the method for manufacture ball mill steel ball according to claim 1, is characterized in that, described temperature is that the water of 30 ℃~50 ℃ is connected with water circulation cooling device or heat abstractor, remains in the scope of 30 ℃~50 ℃ to guarantee that water temperature is constant.
6. the method for manufacture ball mill steel ball according to claim 1, is characterized in that, described method also is included in the heating strand and then before the step of rolling, casting billet surface is cooled to the step that then adopts the flame cleaning surface defect of bloom below 100 ℃.
CN2011103608570A 2011-11-15 2011-11-15 Manufacturing method for steel ball for ball mill CN102443741B (en)

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CN102758140B (en) * 2012-07-04 2014-03-26 攀钢集团攀枝花钢铁研究院有限公司 High-carbon microalloying steel ball and production process thereof
CN104549663B (en) * 2013-10-10 2018-07-31 谢兆宗 Milling medium and device and method for producing milling medium
CN104056696B (en) * 2014-06-05 2017-05-17 宁国慧宏耐磨材料有限公司 Preparation method of wet-process milling mine-dedicated ball
CN104532139B (en) * 2015-01-07 2016-08-24 攀钢集团攀枝花钢铁研究院有限公司 High-strength tenacity steel ball and production method thereof
CN104561502B (en) * 2015-01-08 2017-06-16 攀钢集团攀枝花钢铁研究院有限公司 The production method of high-hardenability steel ball
CN104772196B (en) * 2015-03-12 2018-11-09 河北首鼎金属制品有限公司 It is a kind of to forge more rib abrading-balls and its manufacturing method
CN104985095B (en) * 2015-07-20 2017-01-04 江阴东邦钢球机械有限公司 Ball rolling technique
CN106567000A (en) * 2016-10-28 2017-04-19 河北天理环保科技有限公司 Forged high-wear-resistance steel ball and production method
CN106435363A (en) * 2016-10-28 2017-02-22 河北天理环保科技有限公司 Rolled high-wearable steel ball and production method thereof
CN110106431A (en) * 2019-05-25 2019-08-09 徐州国隆电力配件铸造有限公司 A kind of formula and its preparation process of energy conservation steel ball

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CN101492793A (en) * 2009-02-21 2009-07-29 丁起 Medium-lower alloy abrasion resistant steel

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