CN104164614A - Wear-resistant ball with favorable mechanical properties - Google Patents
Wear-resistant ball with favorable mechanical properties Download PDFInfo
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- CN104164614A CN104164614A CN201410384284.9A CN201410384284A CN104164614A CN 104164614 A CN104164614 A CN 104164614A CN 201410384284 A CN201410384284 A CN 201410384284A CN 104164614 A CN104164614 A CN 104164614A
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Abstract
The invention discloses a wear-resistant ball with favorable mechanical properties, which comprises the following components in percentage by weight: 2.95-3.0% of C, 1.2-1.24% of Si, 0.7-0.8% of Mn, 21-21.5% of Cr, 0.1-0.2% of B, 0.4-0.45% of Mo, 0.04-0.06% of Re, at most 0.02% of S, at most 0.02% of P and the balance of Fe. By using the reasonable formula design and the reasonable smelting, casting and heat treatment techniques, the overall mechanical properties of the wear-resistant cast ball are enhanced. The casting time and casting duration are controlled to prevent the shrinkage porosity and shrinkage voids from generation and enhance the toughness and wear resistance of the wear-resistant cast ball. The Shore A-type hardness is greater than or equal to 62, the impact value is greater than or equal to 8.2 J/cm<2>, the falling ball impact fatigue life is greater than or equal to 20000 times, the core hardness and surface hardness are basically the same, and the breaking ratio is lower than 7%.
Description
Technical field
The present invention relates to wear-resistant ball technical field, be specifically related to a kind of wear-resistant ball with excellent mechanical performances.
Background technology
Ball mill is after material is broken, then the key equipment of pulverizing.It is widely used in cement, and the production industries such as silicate product, New Building Materials, refractory materials, chemical fertilizer, glass-ceramic carry out dry type or wet type grinding to various ores and other grindability index material.Ball mill is made up of feed portion, discharging portion, rotating part, step-down gear, small transmission gear, motor, the major portion such as automatically controlled.Quill shaft adopts steel casting, liner replaceable, and revolution master wheel adopts foundry goods gear hobbing processing, studs with abrasion-proof backing block in cylindrical shell, has good wear resistance.
Wear resisting cast ball refers to the crushing medium for ball mill, for the material of crushing mill.There are at present two kinds of forms: the one, the white cast iron taking chromium as main alloy element is called for short chrome alloy cast iron, and the cast grinding ball taking chrome alloy cast iron as material is called chromium alloy iron casting abrading ball; The 2nd, the cast grinding ball taking spheroidal graphite cast iron as material is called ductile iron grinding ball, and the matrix wherein obtaining by thermal treatment is mainly that the ductile iron grinding ball of bainite is called for short bainite ductile iron abrading-ball; The matrix obtaining by thermal treatment is mainly that martensitic ductile iron grinding ball is called for short martensite nodular cast iron grinding ball.
In Chinese Patent Application No.: disclose seven yuan of high alloy wear-resistance balls of a kind of high chromium in 201310569196, each chemical composition is by weight percentage: C:3.4～3.7%, Si:1.2～1.6%, Mn:0.5～1.0%, P≤0.03%, S≤0.03%, Cu:0.5～1.2%, Cr:11.0～12.0%, Ti:0.05～0.1%, surplus are Fe.Thermal treatment packs the wear-resistant ball under room temperature state in heat treatment furnace into, and below 500 DEG C time, heat-up rate is not higher than 80 DEG C/h; Intensification is incubated 2～3 hours while reaching 500 DEG C; Heat-up rate while reheating from 500 DEG C to 920 DEG C is 100～110 DEG C/h; After reaching 920 DEG C, be incubated 1～2 hour, now temperature is controlled at 910～930 DEG C; Proceed to oil quenching to 150 DEG C～room temperature, be reloaded into heat treatment furnace, Control for Kiln Temperature, at 300～360 DEG C, is incubated air cooling after 2～6 hours.Wear-resistant ball in this technical scheme, its wear resistance increased and improved with carbon content before this, and wear resistance the best in the time that carbon content reaches 3.0-3.2%, further improves carbon content wear resistance and reduces gradually, mechanical property deficiency, this technical scheme haves much room for improvement.
In Chinese Patent Application No.: disclose a kind of wear resisting cast ball material in 201310677162, chemical element composition and mass percent thereof that it contains are: carbon 1.6-1.8, silicon 1.2-1.5, manganese 2.4-2.7, boron 0.4-0.6, chromium 13.2-14.5, titanium 5.8-6.5, Be0.7-0.9, La0.03-0.05, P≤0.07, S≤0.07, surplus are iron.In Chinese Patent Application No.: disclose a kind of wear-resisting middle chromium multielement alloy cast ball material in 201310677484, chemical element composition and mass percent thereof that it contains are: carbon 2.6-2.9, silicon 1.6-1.8, manganese 3.2-3.5, nickel 0.3-0.6, vanadium 2.1-2.3, boron 0.7-0.9, tungsten 0.6-0.8, titanium 1.6-1.8, chromium 6-7, Lu0.05-0.08, Zr0.06-0.09, P≤0.07, S≤0.07, surplus are iron.Rare elements content in above two technical schemes is too much, cause cost to increase, simultaneously harmful element P, S content are more, the actual constituent of high-abrasive material from eutectic point away from, liquid-solid two-phase region is wide, while causing solidifying from slightly territory, far field of metal mold abrading-ball die cavity exterior surface area, easily present mushy freezing feature, easily block Feeding channel, easily produce the phenomenon of shrinkage porosite, shrinkage cavity, above two technical schemes have much room for improvement.
In Chinese Patent Application No.: disclose a kind of manufacture method of high carbon and chromium high manganese cast ball in 201210291075, raw material is steel scrap: bearing scrap stock: C:0.3-1.0%; Si :≤0.4%; Mn :≤0.3%; Cr:0.5-1.5%; High carbon ferro-chrome: Cr:60%; Si :≤1.5; Fe :≤38%; High carbon ferromanganese: Mn:58%; S :≤2%; Fe :≤40%.This technical scheme is low work-ing life, and hardness, wear resistance are all not enough.
In Chinese Patent Application No.: Cr grinding balls and secondary metamorphic processing technique thereof in disclosing a kind of high silicon in 201010226728.8, in described high silicon, Cr grinding balls is made up of 2.2～3.3% C, 1.7～2.2% Si, 0.8～1.5% Mn, 0～0.05% P, 0～0.05% S, 6.0～9.0% Cr, 0.003～0.008% B, 0.01～0.025% Ti and the Fe of surplus by weight percentage, wherein, the weight ratio of described Ti and B is greater than 3.The pouring time of this technical scheme is long, easily fails to original state, and this technical scheme haves much room for improvement.
summary of the invention
For the problems referred to above, type of the present invention provides a kind of wear-resistant ball with excellent mechanical performances, and wear resistance, toughness, hardness are good, long service life.
In order to address the above problem, the technical scheme that type of the present invention provides is:
Have a wear-resistant ball for excellent mechanical performances, each composition and weight percent are: C:2.95-3.0%, Si:1.2-1.24%, Mn:0.7-0.8%, Cr:21-21.5%, B:0.1-0.2%, Mo:0.4-0.45%, Re:0.04-0.06%, S :≤0.02%, P :≤0.02%; Surplus is Fe.
Preferably, each composition and weight percent are: C:2.97-3.0%, Si:1.2-1.23%, Mn:0.73-0.8%, Cr:21-21.4%, B:0.13-0.2%, Mo:0.4-0.44%, Re:0.045-0.06%, S :≤0.02%, P :≤0.02%; Surplus is Fe.
Preferably, each composition and weight percent are: C:2.97%, Si:1.23%, Mn:0.73%, Cr:21.4%, B:0.15%, Mo:0.44%, Re:0.045%, S:0.02%, P:0.01%; Surplus is Fe.
Preferably, each composition and weight percent are: C:2.98%, Si:1.22%, Mn:0.75%, Cr:21.2%, B:0.13%, Mo:0.42%, Re:0.055%, S:0.01%, P:0.02%; Surplus is Fe.
The production method of wear-resistant ball, comprises the following steps:
(1) add steel scrap, the pig iron, ferrosilicon, adopt intermediate frequency furnace to carry out melting, temperature adds the ferromanganese of preheating while being 1520-1530 DEG C, and carries out composition analysis, adjustment; Temperature adds aluminum strip to carry out deoxidation treatment while being 1560-1570 DEG C, and the processing of skimming;
(2) add the Re processing of going bad: granularity 1.0-1.2mm adds with iron liquid in the time that 50-55% molten iron is poured ladle into;
(3) casting; Temperature is: 1360-1380 DEG C;
(4) unpack, polish, 330-340 DEG C of the temperature of unpacking;
(5) quench treatment: be heated to 900 DEG C with the speed of 80 DEG C/h, in the time that temperature is 900-920 DEG C, be incubated 3.4-3.8 hours, and then be cooled to room temperature with the speed of 120 DEG C/h;
(6) temper: be heated to 430 DEG C with the speed of 60 DEG C/h, in the time that temperature is 430-440 DEG C, be incubated 2.8-3.0 hours, be then cooled to room temperature.
Preferably, after completing steps (2), within 6-8 minutes, carry out step (3).Prevent that iron liquid from failing to original state.
Preferably, while carrying out step (3), casting duration is 6-8 minutes.
Preferably, while carrying out step (5), carry out quench treatment 160-180 DEG C of shove charges.
For rich chromium cast iron, its wear resistance increased and improved with carbon content before this, and wear resistance the best in the time that carbon content reaches 3.0% left and right, further improves carbon content wear resistance and reduce gradually.Chromium amount determines carbide, and it is mainly in microstructure, to contain due to more M7C3 carbide that rich chromium cast iron has superior wear resistance.In carbide and wear resistance relation, wear resistance is also first to increase and improve with carbide amount, and in the time that carbide amount is increased to 30%, the raising of wear resistance is just not obvious.
Chromium, except forming carbide with carbon, is still partially dissolved in austenite and improves hardening capacity, when the constant increase chromium of carbon amount amount, or the constant reduction carbon of chromium amount amount, all can make hardening capacity improve.When eutectic carbides is constant, and Cr/C is while being 6.5-8, and the failure crack extended capability of rich chromium cast iron is the strongest, comprehensively analyzes C:2.95-3.0%, Cr:21-21.5%.
Compared with prior art, the beneficial effect of type of the present invention is:
The present invention designs by rational formula, rationally melting, casting, thermal treatment process, improve the overall mechanical properties of mill cast ball, by the control of pouring time, casting duration, prevent the generation of shrinkage porosite, shrinkage cavity, also toughness and the wear resistance of wear resisting cast ball have been improved, quenching state Shao Shi A type hardness tester>=62 degree, impact value>=8.2J/cm
2, ball falling impact fatigue lifetime>=20000 time, core hardness and surface hardness are basically identical, and percentage of damage is lower than 7%.
Embodiment
Below type of the present invention is described further:
Embodiment 1:
Have a wear-resistant ball for excellent mechanical performances, each composition and weight percent are: C:2.95%, Si:1.24%, Mn:0.7%, Cr:21.5%, B:0.1%, Mo:0.45%, Re:0.04%, S:0.02%, P:0.02%; Surplus is Fe.
The production method of wear-resistant ball, comprises the following steps:
(1) add steel scrap, the pig iron, ferrosilicon, adopt intermediate frequency furnace to carry out melting, temperature adds the ferromanganese of preheating while being 1520 DEG C, and carries out composition analysis, adjustment; Temperature adds aluminum strip to carry out deoxidation treatment while being 1570 DEG C, and the processing of skimming;
(2) add Re processing: the granularity 1.0mm that goes bad, in the time that 55% molten iron is poured ladle into, add with iron liquid;
(3) casting; Completing steps (2) is cast for latter 6 minutes, and temperature is: 1380 DEG C, casting duration is 6 minutes;
(4) unpack, polish, 340 DEG C of the temperature of unpacking;
(5) quench treatment: 160 DEG C of shove charges, be heated to 900 DEG C with the speed of 80 DEG C/h, in the time that temperature is 920 DEG C, is incubated 3.4 hours, and then is cooled to room temperature with the speed of 120 DEG C/h;
(6) temper: be heated to 430 DEG C with the speed of 60 DEG C/h, in the time that temperature is 440 DEG C, be incubated 2.8 hours, be then cooled to room temperature.
Embodiment 2:
Have a wear-resistant ball for excellent mechanical performances, each composition and weight percent are: C:3.0%, Si:1.2%, Mn:0.8%, Cr:21%, B:0.2%, Mo:0.4%, Re:0.06%, S:0.01%, P:0.01%; Surplus is Fe.
The production method of wear-resistant ball, comprises the following steps:
(1) add steel scrap, the pig iron, ferrosilicon, adopt intermediate frequency furnace to carry out melting, temperature adds the ferromanganese of preheating while being 1530 DEG C, and carries out composition analysis, adjustment; Temperature adds aluminum strip to carry out deoxidation treatment while being 1560 DEG C, and the processing of skimming;
(2) add Re processing: the granularity 1.2mm that goes bad, in the time that 50% molten iron is poured ladle into, add with iron liquid;
(3) casting; Completing steps (2) is cast for latter 8 minutes, and temperature is: 1360 DEG C, casting duration is 8 minutes;
(4) unpack, polish, 330 DEG C of the temperature of unpacking;
(5) quench treatment: 180 DEG C of shove charges, be heated to 900 DEG C with the speed of 80 DEG C/h, in the time that temperature is 900 DEG C, is incubated 3.8 hours, and then is cooled to room temperature with the speed of 120 DEG C/h;
(6) temper: be heated to 430 DEG C with the speed of 60 DEG C/h, in the time that temperature is 430 DEG C, be incubated 3.0 hours, be then cooled to room temperature.
Embodiment 3:
Have a wear-resistant ball for excellent mechanical performances, each composition and weight percent are: C:3.0%, Si:1.2%, Mn:0.75%, Cr:21.3%, B:0.15%, Mo:0.45%, Re:0.05%, S:0.016%, P:0.015%; Surplus is Fe.
The production method of wear-resistant ball, comprises the following steps:
(1) add steel scrap, the pig iron, ferrosilicon, adopt intermediate frequency furnace to carry out melting, temperature adds the ferromanganese of preheating while being 1525 DEG C, and carries out composition analysis, adjustment; Temperature adds aluminum strip to carry out deoxidation treatment while being 1565 DEG C, and the processing of skimming;
(2) add Re processing: the granularity 1.1mm that goes bad, in the time that 52% molten iron is poured ladle into, add with iron liquid;
(3) casting; Completing steps (2) is cast for latter 7 minutes, and temperature is: 1370 DEG C, casting duration is 7 minutes;
(4) unpack, polish, 335 DEG C of the temperature of unpacking;
(5) quench treatment: 170 DEG C of shove charges, be heated to 900 DEG C with the speed of 80 DEG C/h, in the time that temperature is 910 DEG C, is incubated 3.6 hours, and then is cooled to room temperature with the speed of 120 DEG C/h;
(6) temper: be heated to 430 DEG C with the speed of 60 DEG C/h, in the time that temperature is 435 DEG C, be incubated 2.9 hours, be then cooled to room temperature.
Embodiment 4:
Have a wear-resistant ball for excellent mechanical performances, each composition and weight percent are: C:2.97%, Si:1.23%, Mn:0.73%, Cr:21.4%, B:0.15%, Mo:0.44%, Re:0.045%, S:0.02%, P:0.01%; Surplus is Fe.
The production method of wear-resistant ball, comprises the following steps:
(1) add steel scrap, the pig iron, ferrosilicon, adopt intermediate frequency furnace to carry out melting, temperature adds the ferromanganese of preheating while being 1524 DEG C, and carries out composition analysis, adjustment; Temperature adds aluminum strip to carry out deoxidation treatment while being 1568 DEG C, and the processing of skimming;
(2) add Re processing: the granularity 1.15mm that goes bad, in the time that 54% molten iron is poured ladle into, add with iron liquid;
(3) casting; Completing steps (2) is cast for latter 6.5 minutes, and temperature is: 1375 DEG C, casting duration is 7.5 minutes;
(4) unpack, polish, 336 DEG C of the temperature of unpacking;
(5) quench treatment: 165 DEG C of shove charges, be heated to 900 DEG C with the speed of 80 DEG C/h, in the time that temperature is 900 DEG C, is incubated 3.7 hours, and then is cooled to room temperature with the speed of 120 DEG C/h;
(6) temper: be heated to 430 DEG C with the speed of 60 DEG C/h, in the time that temperature is 430 DEG C, be incubated 3.0 hours, be then cooled to room temperature.
Embodiment 5:
Have a wear-resistant ball for excellent mechanical performances, each composition and weight percent are: C:2.98%, Si:1.22%, Mn:0.75%, Cr:21.2%, B:0.13%, Mo:0.42%, Re:0.055%, S:0.01%, P:0.02%; Surplus is Fe.
The production method of wear-resistant ball, comprises the following steps:
(1) add steel scrap, the pig iron, ferrosilicon, adopt intermediate frequency furnace to carry out melting, temperature adds the ferromanganese of preheating while being 1528 DEG C, and carries out composition analysis, adjustment; Temperature adds aluminum strip to carry out deoxidation treatment while being 1562 DEG C, and the processing of skimming;
(2) add Re processing: the granularity 1.05mm that goes bad, in the time that 52% molten iron is poured ladle into, add with iron liquid;
(3) casting; Completing steps (2) is cast for latter 7.5 minutes, and temperature is: 1375 DEG C, casting duration is 6.5 minutes;
(4) unpack, polish, 335 DEG C of the temperature of unpacking;
(5) quench treatment: 160 DEG C of shove charges, be heated to 900 DEG C with the speed of 80 DEG C/h, in the time that temperature is 900 DEG C, is incubated 3.8 hours, and then is cooled to room temperature with the speed of 120 DEG C/h;
(6) temper: be heated to 430 DEG C with the speed of 60 DEG C/h, in the time that temperature is 440 DEG C, be incubated 2.8 hours, be then cooled to room temperature.
The mechanical property of the wear-resistant ball to above-mentioned 5 embodiment detects, and the wear-resistant ball that each embodiment chooses 3 kinds of different diameters at random detects, and result is as follows:
More than show and described the advantage of ultimate principle, principal character and the type of the present invention of type of the present invention.The technician of the industry should understand; type of the present invention is not restricted to the described embodiments; the principle that type of the present invention is just described of describing in above-described embodiment and specification sheets; do not departing under the prerequisite of type spirit and scope of the present invention; type of the present invention also has various changes and modifications, and these changes and improvements all fall within the scope of claimed type of the present invention.The claimed scope of type of the present invention is defined by appending claims and equivalent thereof.
Claims (8)
1. a wear-resistant ball with excellent mechanical performances, is characterized in that: each composition and weight percent are: C:2.95-3.0%, Si:1.2-1.24%, Mn:0.7-0.8%, Cr:21-21.5%, B:0.1-0.2%, Mo:0.4-0.45%, Re:0.04-0.06%, S :≤0.02%, P :≤0.02%; Surplus is Fe.
2. the wear-resistant ball with excellent mechanical performances according to claim 1, is characterized in that: each composition and weight percent are: C:2.97-3.0%, Si:1.2-1.23%, Mn:0.73-0.8%, Cr:21-21.4%, B:0.13-0.2%, Mo:0.4-0.44%, Re:0.045-0.06%, S :≤0.02%, P :≤0.02%; Surplus is Fe.
3. the wear-resistant ball with excellent mechanical performances according to claim 1 and 2, is characterized in that: each composition and weight percent are: C:2.97%, Si:1.23%, Mn:0.73%, Cr:21.4%, B:0.15%, Mo:0.44%, Re:0.045%, S:0.02%, P:0.01%; Surplus is Fe.
4. the wear-resistant ball with excellent mechanical performances according to claim 1 and 2, is characterized in that: each composition and weight percent are: C:2.98%, Si:1.22%, Mn:0.75%, Cr:21.2%, B:0.13%, Mo:0.42%, Re:0.055%, S:0.01%, P:0.02%; Surplus is Fe.
5. the production method of the wear-resistant ball with excellent mechanical performances according to claim 1 and 2, is characterized in that, comprises the following steps:
(1) add steel scrap, the pig iron, ferrosilicon, adopt intermediate frequency furnace to carry out melting, temperature adds the ferromanganese of preheating while being 1520-1530 DEG C, and carries out composition analysis, adjustment; Temperature adds aluminum strip to carry out deoxidation treatment while being 1560-1570 DEG C, and the processing of skimming;
(2) add the Re processing of going bad: granularity 1.0-1.2mm adds with iron liquid in the time that 50-55% molten iron is poured ladle into;
(3) casting; Temperature is: 1360-1380 DEG C;
(4) unpack, polish, 330-340 DEG C of the temperature of unpacking;
(5) quench treatment: be heated to 900 DEG C with the speed of 80 DEG C/h, in the time that temperature is 900-920 DEG C, be incubated 3.4-3.8 hours, and then be cooled to room temperature with the speed of 120 DEG C/h;
(6) temper: be heated to 430 DEG C with the speed of 60 DEG C/h, in the time that temperature is 430-440 DEG C, be incubated 2.8-3.0 hours, be then cooled to room temperature.
6. the production method of the wear-resistant ball with excellent mechanical performances according to claim 5, is characterized in that: after completing steps (2), within 6-8 minutes, carry out step (3).
7. the production method of the wear-resistant ball with excellent mechanical performances according to claim 5, is characterized in that: while carrying out step (3), casting duration is 6-8 minutes.
8. the production method of the wear-resistant ball with excellent mechanical performances according to claim 5, is characterized in that: while carrying out step (5), carry out quench treatment 160-180 DEG C of shove charges.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410384284.9A CN104164614A (en) | 2014-08-06 | 2014-08-06 | Wear-resistant ball with favorable mechanical properties |
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| CN201410384284.9A CN104164614A (en) | 2014-08-06 | 2014-08-06 | Wear-resistant ball with favorable mechanical properties |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104772196A (en) * | 2015-03-12 | 2015-07-15 | 河北首鼎金属制品有限公司 | Forged polyhedral grinding ball and manufacturing method thereof |
| CN105177222A (en) * | 2015-07-23 | 2015-12-23 | 柳州市众力金铭热处理有限公司 | Method for prolonging service life of steel rod for rod mill |
| CN105855516A (en) * | 2016-06-20 | 2016-08-17 | 马鞍山市益丰实业集团有限公司 | Preparation method of thermal power generation carburization wear-resisting ball |
-
2014
- 2014-08-06 CN CN201410384284.9A patent/CN104164614A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104772196A (en) * | 2015-03-12 | 2015-07-15 | 河北首鼎金属制品有限公司 | Forged polyhedral grinding ball and manufacturing method thereof |
| 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 |
| CN105177222A (en) * | 2015-07-23 | 2015-12-23 | 柳州市众力金铭热处理有限公司 | Method for prolonging service life of steel rod for rod mill |
| CN105855516A (en) * | 2016-06-20 | 2016-08-17 | 马鞍山市益丰实业集团有限公司 | Preparation method of thermal power generation carburization wear-resisting ball |
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