CN103060663B - A kind of cast alloy iron abrading-ball - Google Patents
A kind of cast alloy iron abrading-ball Download PDFInfo
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- CN103060663B CN103060663B CN201210595109.5A CN201210595109A CN103060663B CN 103060663 B CN103060663 B CN 103060663B CN 201210595109 A CN201210595109 A CN 201210595109A CN 103060663 B CN103060663 B CN 103060663B
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- lower bainite
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Abstract
The invention discloses a kind of cast alloy iron abrading-ball, this abrading-ball is made up of following component with (weight) percentages: C:2.30 ~ 2.50, Si:0.90 ~ 1.20, Mn:1.30 ~ 1.50, Cr:2.0 ~ 3.0, V:0.15 ~ 0.25, B:0.02 ~ 0.06, Ce:0.07 ~ 0.09, P < 0.03, S < 0.03, surplus is Fe and inevitable impurity, described abrading-ball adopts same temperature hardening heat treatment technique to obtain, martensite and lower bainite is comprised in microtexture, wherein the volume fraction of lower bainite is about 22-28%.The various alloying element synergies of cast alloy iron of the present invention improve wear resistance, adopt same temperature hardening heat treatment technique, improve the microtexture of abrading-ball further, and work-ing life is longer than chromium cast iron contained of the prior art more than 2-3 times, and not cracked in using.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy, particularly relate to a kind of cast alloy iron abrading-ball.
Background technology
Chromium alloy cast grinding ball is the main consumable material being widely used in the industries such as technics of metallurgy mineral dressing, cement building material, thermal power generation.At present, abrading-ball is the higher cast-iron grinding ball of carbon content, and chemical composition is by weight percentage C:2 ~ 3.6, Si:0.30 ~ 1.50, Mn:0.40 ~ 1.50, Cr:1.00 ~ 28, P < 0.10, S < 0.06, surplus is Fe.Its casting technique is mostly manual metallic modeling, and thermal treatment process mostly is air blast quenching, and part is oil quenchinng.
Current domestic abrading-ball market is cast-iron grinding ball substantially entirely except forging ball, distinguish by Chrome metal powder content and mainly contain six kinds of products such as low chromium (ZQCr2), middle chromium (ZQCr5), Gao Ge (ZQCr12), superelevation chromium (ZQCr15, ZQCr20, ZQCr26), first two is non-quenching abrading-ball, and hardness is low, wear no resistance, serious waste of resources; Although rear four kinds of wear resistancies better but cost is higher, skyrocketing especially along with ferrochrome price in recent years, production cost is more and more high, and the advantage of its cost performance is lost gradually.
For these reasons, currently available products is common chromium cast iron contained material, and density is low, poor toughness, and wear resistance needs to be improved further.In addition, the product that Chrome metal powder content is low is not wear-resisting, although the wear resistance that Chrome metal powder content is high increases, but toughness is poor, usually easily cause cracked in abrading-ball use procedure, in the cracked work-ing life not only affecting abrading-ball self, pollution may be brought for grinding material again simultaneously, cause scrapping of grinding material.Along with the development of technology and the raising of requirement, traditional chromium cast iron contained abrading-ball that is main hardening agent element with chromium more and more can not meet produces actual needs.Therefore, accelerate the renewal of abrading-ball product technology, replacement paces, the substitute products that exploitation cost performance is higher, become substantial responsibility and the task of top priority of high-abrasive material enterprise.
Summary of the invention
The object of the invention is to propose a kind of cast alloy iron abrading-ball, this abrading-ball passes through the adjustment of cast iron alloy composition and technique, and the hardness of cast iron is improved, and wear resistance improves; And improve the toughness of cast iron, make in its use procedure not cracked, thus increase the service life, to overcome the defect of prior art.
For reaching this object, the present invention by the following technical solutions:
A kind of cast alloy iron abrading-ball, this abrading-ball is made up of following component with (weight) percentages: C:2.30 ~ 2.50, Si:0.90 ~ 1.20, Mn:1.30 ~ 1.50, Cr:2.0 ~ 3.0, V:0.15 ~ 0.25, B:0.02 ~ 0.06, Ce:0.07 ~ 0.09, P < 0.03, S < 0.03, surplus is Fe and inevitable impurity, described abrading-ball adopts same temperature hardening heat treatment technique to obtain, and comprise martensite and lower bainite in microtexture, wherein the volume fraction of lower bainite is about 22-28%.
Preferably, this abrading-ball is made up of following component with (weight) percentages: C:2.40, Si:1.05, Mn:1.40, Cr:2.5, V:0.20, B:0.04, Ce:0.08, P < 0.03, S < 0.03, surplus is Fe and inevitable impurity, described abrading-ball adopts same temperature hardening heat treatment technique to obtain, and comprise martensite and lower bainite in microtexture, wherein the volume fraction of lower bainite is 25%.
Abrading-ball of the present invention can adopt following technique to prepare:
1) prepare burden: scrap iron, ferrosilicon, ferromanganese, ferrochrome, vanadium iron, ferro-boron and cerium-based rare earth are prepared burden by said ratio;
2) melting: scrap iron, ferrosilicon, ferromanganese and the pig iron etc. are put into stove and melts, stokehold adjusting component, temperature is risen to about 1560 ~ 1600 DEG C, add silicocalcium pre-deoxidation, pre-deoxidation is after 3 ~ 4 minutes, add aluminium final deoxygenation, final deoxygenation, after 3 ~ 4 minutes, adds ferrochrome, vanadium iron, after adding 5 ~ 7 minutes, add ferro-boron, ferro-boron is come out of the stove after adding 3 ~ 5 minutes; Cerium-based rare earth is crushed to the fritter that granularity is about 2 ~ 4mm, after drying through about 150 ~ 180 DEG C, is placed in bottom casting ladle, molten iron is poured casting ladle;
3) pour into a mould: melted molten iron is poured into foundry goods, and molten steel pouring temperature is 1450 ~ 1480 DEG C;
4) thermal treatment: the abrading-ball poured into a mould is heated to about 930 ~ 950 DEG C, is incubated 20 ~ 30 minutes, carries out isothermal quenching in the salt bath furnace of about 225 ~ 245 DEG C then quenched, and keeps 10 ~ 14 minutes in salt bath furnace.
Alloys producing in the present invention is:
Carbon is the principal element generating eutectic carbides, and eutectic carbides is at wear resistance important role.Carbon content determines the quantity of carbide.But carbon amounts is too high, then toughness reduces.Consider and determine that carbon content is above-mentioned scope.
Add appropriate vanadium and boron: vanadium is carbide forming element, the hardness that appropriate carbide can improve abrading-ball is formed with carbon, add hardness and wear resistance that a small amount of boron can improve abrading-ball, therefore the comprehensive mechanical performance, particularly hardness of abrading-ball, wear resistance and impelling strength can be significantly improved both.
Chromium is carbide forming element, and Cr is fused in austenite and strengthens matrix and do not reduce toughness, postpones Cooling Austenite Transformation, and increase the hardening capacity of abrading-ball, Cr makes the intensity of abrading-ball and hardness significantly improve, and Cr can also crystal grain thinning in addition, improves temper resistance.Along with increasing of Cr content can sacrifice impelling strength, impelling strength can reduce and certainly will increase the cost of abrading-ball greatly, the present invention improves hardness and the wear resistance of abrading-ball owing to adding vanadium and boron, thus, significantly can substitute high chromium content of the prior art, thus the present invention adopts lower chromium content, in order to ensure that abrading-ball has enough toughness.
Manganese is a kind of effective element improving hardening capacity, expand austenitic area.Its effect one is deoxidation, and two is strengthening matrix and carbide.Manganese content is too high, adds austenitic stability, reduces Ms point, is unfavorable for that Cast Austenite changes; A small amount of manganese has refining effect for troostite.
Add appropriate rare earth element, improve the form of carbide and inclusion, thus the auxiliary toughness improving abrading-ball.
The present invention has following beneficial effect:
1) the present invention is on the basis of great many of experiments, by adjusting the chemical composition of cast alloy iron, by adding appropriate boron and vanadium, coordinate the chromium of low levels, the content of three reaches synergy, significantly can improve hardness and the wear resistance of abrading-ball, and keeps abrading-ball to have suitable toughness, in addition by adding appropriate rare-earth element cerium, the toughness of abrading-ball is further improved.The various alloying element synergies of cast alloy iron of the present invention make the wear resistance of cast iron improve, and work-ing life is longer than chromium cast iron contained of the prior art more than 2-3 times, and it is low to wear and tear in using, and the pollution brought for material is few; Particularly, owing to improving the toughness of abrading-ball, not cracked in abrading-ball use procedure of the present invention.
2) abrading-ball of the present invention adopts same temperature hardening heat treatment to obtain, the further microtexture improving abrading-ball, obtain the microtexture comprising martensite and lower bainite, wherein the volume fraction of lower bainite is 22-28%, improve form and the distribution of carbide, thus improve the toughness of abrading-ball further.
Embodiment
Embodiment one
A kind of cast alloy iron abrading-ball, this abrading-ball is made up of following component with (weight) percentages: C:2.30, Si:1.20, Mn:1.30, Cr:3.0, V:0.15, B:0.06, Ce:0.07, P < 0.03, S < 0.03, surplus is Fe and inevitable impurity, described abrading-ball adopts same temperature hardening heat treatment technique to obtain, and comprise martensite and lower bainite in microtexture, wherein the volume fraction of lower bainite is 22%.
Embodiment two
A kind of cast alloy iron abrading-ball, this abrading-ball is made up of following component with (weight) percentages: C:2.50, Si:0.90, Mn:1.50, Cr:2.0, V:0.25, B:0.02, Ce:0.09, P < 0.03, S < 0.03, surplus is Fe and inevitable impurity, described abrading-ball adopts same temperature hardening heat treatment technique to obtain, and comprise martensite and lower bainite in microtexture, wherein the volume fraction of lower bainite is 28%.
Embodiment three
A kind of cast alloy iron abrading-ball, this abrading-ball is made up of following component with (weight) percentages: C:2.40, Si:1.05, Mn:1.40, Cr:2.5, V:0.20, B:0.04, Ce:0.08, P < 0.03, S < 0.03, surplus is Fe and inevitable impurity, described abrading-ball adopts same temperature hardening heat treatment technique to obtain, and comprise martensite and lower bainite in microtexture, wherein the volume fraction of lower bainite is 25%.
Applicant states, the present invention illustrates detailed process equipment and process flow process of the present invention by above-described embodiment, but the present invention is not limited to above-mentioned detailed process equipment and process flow process, namely do not mean that the present invention must rely on above-mentioned detailed process equipment and process flow process and could implement.Person of ordinary skill in the field should understand, any improvement in the present invention, to equivalence replacement and the interpolation of ancillary component, the concrete way choice etc. of each raw material of product of the present invention, all drops within protection scope of the present invention and open scope.
Claims (1)
1. a cast alloy iron abrading-ball, it is characterized in that, this abrading-ball is made up of following component by weight percentage: C:2.40, Si:1.05, Mn:1.40, Cr:2.5, V:0.20, B:0.04, Ce:0.08, P < 0.03, S < 0.03, surplus is Fe and inevitable impurity, boron, the content of vanadium and chromium three reaches synergy, significantly improve hardness and the wear resistance of abrading-ball, and keep abrading-ball to have suitable toughness, described abrading-ball adopts same temperature hardening heat treatment technique to obtain, martensite and lower bainite is comprised in microtexture, wherein the volume fraction of lower bainite is 25%, improve form and the distribution of carbide, thus improve the toughness of abrading-ball further.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210595109.5A CN103060663B (en) | 2012-12-26 | 2012-12-26 | A kind of cast alloy iron abrading-ball |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210595109.5A CN103060663B (en) | 2012-12-26 | 2012-12-26 | A kind of cast alloy iron abrading-ball |
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| CN103060663A CN103060663A (en) | 2013-04-24 |
| CN103060663B true CN103060663B (en) | 2015-08-19 |
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| CN103849753B (en) * | 2014-03-21 | 2016-04-06 | 仪征亚新科双环活塞环有限公司 | YH31 material piston ring isothermal quenching technique |
| CN104988379A (en) * | 2015-06-30 | 2015-10-21 | 柳州金特新型耐磨材料股份有限公司 | Evaporative pattern HT200 gray pig iron |
| CN107774400A (en) * | 2017-10-23 | 2018-03-09 | 宁国市正兴耐磨材料有限公司 | A kind of wear-resistant ball of high-hardness high temperature resistant |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1100150A (en) * | 1993-09-09 | 1995-03-15 | 株洲市机械工业研究所 | Impact fatigue-resistant wear-proof alloy cast iron |
| CN1361301A (en) * | 2000-12-28 | 2002-07-31 | 上海大学 | Nodular cast iron containing vanadium bainite and its production process |
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- 2012-12-26 CN CN201210595109.5A patent/CN103060663B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1100150A (en) * | 1993-09-09 | 1995-03-15 | 株洲市机械工业研究所 | Impact fatigue-resistant wear-proof alloy cast iron |
| CN1361301A (en) * | 2000-12-28 | 2002-07-31 | 上海大学 | Nodular cast iron containing vanadium bainite and its production process |
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