CN101444841A - Method for preparing wear-resistant cast steel bucket tooth - Google Patents
Method for preparing wear-resistant cast steel bucket tooth Download PDFInfo
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- CN101444841A CN101444841A CNA2008102468415A CN200810246841A CN101444841A CN 101444841 A CN101444841 A CN 101444841A CN A2008102468415 A CNA2008102468415 A CN A2008102468415A CN 200810246841 A CN200810246841 A CN 200810246841A CN 101444841 A CN101444841 A CN 101444841A
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- bucket tooth
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Abstract
The invention relates to a method for preparing a wear-resistant cast steel bucket tooth, which belongs to the technical field of metal wear-resistant materials. The prior bucket tooth and the processing technique thereof have the problems of high cost, complex technique and the like. In the method, tinplate leftover material, high carbon ferro-chrome, mid-carbon ferromanganese, silicoferrite, ferroboron, ferrozirconium and ferrotitanium are mixed up respectively according to the following mass percent: 96.3 to 97.0 percent, 1.5 to 1.8 percent, 0.8 to 1.2 percent, 0.4 to 0.6 percent, 0.025 to 0.035 percent, 0.045 to 0.055 percent and 0.18 to 0.25 percent; the mixture is compacted by a forcing press to form a quadrel which is then put in an induction furnace for heating and melting down and is cast to form the bucket tooth in a cere shuttering; the bucket tooth is put in water directly for cooling after being congealed, and is tempered under the low temperature at last to obtain the wear-resistant cast steel bucket tooth. The method for preparing the wear-resistant cast steel bucket tooth has the advantages of low manufacture cost, high productivity effect, long service life of the bucket tooth, etc.
Description
Technical field
The invention belongs to technical field of metal wear.Be specifically related to a kind of preparation method of wear-resistant cast steel bucket tooth, particularly a kind of is the preparation method of the wear-resistant cast steel bucket tooth of primary raw material with the tinplate leftover pieces.
Background technology
Bucket tooth generally is contained in the power shovel front end, is cantilevered beam members, directly contacts with materials such as ore, sand, rocks, and when the contact material, flecition is born in the effect that both withstood shocks again.In the military service process, the bucket tooth tip is subjected to bigger impact slip abrasive wear, and tip surface is normal various ditch dug with a plow, distortion to occur, causes surface abrasion or comes off.Domestic large excavator is used import material 20CrNi2Mo, cost height more.Chinese invention patent CN1385550 discloses a kind of high wear-resistant ally and production method thereof, its chemical composition includes the C of 0.4-1.5%, the Mn of 6.0-20%, the Cr of 1.0-3.0%, the Ni of 0.5-4.0%, the inovulant of 0.05-0.25% and Si, S, P, wherein Si content≤0.8, S content≤0.04, P content≤0.06, be used to make bucket tooth, abrasion resistance and like product have relatively improved 30-70%.Owing to contain expensive nickel element, cause the bucket tooth production cost to raise.Chinese invention patent CN1621554 discloses a kind of complex alloy cast-steel excavator bucket teeth and production technology thereof, the composition of complex alloy cast-steel (weight %) is: C0.22-0.45, Cr≤2.0, Mn≤2.0, Si≤2.0, Mo0.20-0.50, Ti0.05-0.20, surplus are Fe, owing to contain expensive molybdenum element, cause the bucket tooth production cost to raise.
Cheng Juqiang has also introduced a kind of high-strength cast steel bucket tooth material (Cheng Juqiang, the development of high-strength cast steel bucket tooth material and application, engineering machinery, 2007,38 volumes, the 7th phase, the 57-59 page or leaf), the composition of high-strength cast steel bucket tooth material be in, low-carbon low-alloy steel, main chemical compositions is silicon, manganese, nickel, molybdenum etc., the composition range of essential element is 0.18%～0.30%C, 1.2%～1.6%Si, 1.8%～2.2%Mn, 0.4%～0.7%Ni, 0.2%～0.3%Mo.Mechanical property after the bucket tooth heat treatment is intensity (σ
b) 〉=1650Mpa, impact toughness (A
KU) 〉=20J, hardness 46～52HRC owing to contain expensive nickel and molybdenum element, causes the bucket tooth production cost to raise.In order further to improve bucket tooth service life, Chinese invention patent CN1410192 discloses the wear-resistant bucket tooth manufacture method of a kind of bimetallic electroslag smelting casting, its bucket tooth is made up of the tooth handle and the crown of different materials, manufacturing process is that the side with the tooth handle is the bond face, the also upwards stack of multilayer opposite opened water mold according to tooth handle working face front end, do consutrode with rich chromium cast iron, an electroslag smelting casting goes out a plurality of crowns with regard to founding, simultaneously, the low-carbon alloy steel of respective amount or manganese steel tooth handle are melt into one, form one group of bucket tooth group, then, cut into bucket tooth one by one with the conduction cutting equipment.This technology exists complex process and the relatively poor deficiency of bucket tooth quality stability.
Summary of the invention
The deficiency that exists in the present invention seeks to produce at present bucket tooth is developed that a kind of production technology is easy, raw material sources abundant, is not contained the preparation method of the wear-resistant cast steel bucket tooth of valuable alloying element such as molybdenum, nickel and low production cost.
The present invention is a primary raw material with the tinplate leftover pieces, and add a small amount of high carbon ferro-chrome, ferrosilicon, mid-carbon fe-mn and micro-ferro-boron, ferrozirconium, rare earth ferrosilicon and ferrotianium, above-mentioned raw material are compacted at one on forcing press, place directly fusing in the induction heater then, directly pour into bucket tooth subsequently, after bucket tooth solidifies, directly into water cooling, tempering at low temperatures at last obtains the bucket tooth of excellent combination property, and concrete steps are as follows:
1) with tinplate leftover pieces, high carbon ferro-chrome, mid-carbon fe-mn, ferrosilicon, ferro-boron, ferrozirconium and ferrotianium, 96.3～97.0%, 1.5～1.8%, 0.8～1.2%, 0.4～0.6%, 0.025～0.035%, 0.045～0.055% and 0.18～0.25% be mixed in one by mass percentage, and on forcing press, be compacted into the square that is of a size of (150～250) mm * (150～250) mm * (150～250) mm, then the square of compacting is put into the electric induction furnace heat fused, when liquid steel temperature reaches 1600～1640 ℃, come out of the stove;
2) after molten steel left standstill 3～5min, moulding by casting in mould shell temperature is not less than 500 ℃ cured formwork obtained bucket tooth;
3) after the bucket tooth surface temperature reaches 880～950 ℃, bucket tooth and formwork are put into water together cool off, cut the dead head on the bucket tooth subsequently, and bucket tooth is heated to 230～280 ℃ with stove, air cooling behind insulation 8～10h obtains wear-resistant cast steel bucket tooth.
The primary raw material of bucket tooth of the present invention derives from the tinplate leftover pieces, because tinplate leftover pieces thin thickness, directly into the stove heating, scaling loss is serious, therefore before going into the stove heating, need carry out compaction treatment on forcing press.In addition, high carbon ferro-chrome, ferrosilicon, mid-carbon fe-mn and micro-ferro-boron, ferrozirconium, rare earth ferrosilicon and ferrotianium also are mixed in one with the tinplate leftover pieces, and compacting on forcing press, can reduce the alloying element oxidization burning loss, improve the alloying element recovery rate.Meanwhile, also can improve the uniformity of alloying elements distribution in the molten steel, help eliminating the segregation of alloying element in the bucket tooth, improve the combination property of bucket tooth.The present invention adds high carbon ferro-chrome, ferrosilicon, mid-carbon fe-mn, mainly is in order to improve bucket tooth intensity and hardness, adds ferro-boron and be in order to improve bucket tooth quenching degree, to add ferrozirconium, rare earth ferrosilicon and ferrotianium to be for refinement and to purify solidified structure, improves bucket tooth toughness.The tin on tinplate surface partly residues in bucket tooth in addition, also helps improving the comprehensive mechanical property of bucket tooth.Because tinplate leftover pieces thin thickness, therefore easily fusing is main furnace charge with the tinplate leftover pieces, and smelting time is short, and power consumption is low and the alloying element scaling loss is few.
In addition, pour into a mould bucket tooth in mould shell temperature is not less than 500 ℃ cured formwork, the bucket tooth formability is good, and the bucket tooth presentation quality is good, easily assembling, and casting flaws such as pore can not appear in bucket tooth inside yet.Because cured formwork thin thickness, usually less than 20mm,, bucket tooth and formwork are gone into water cooling together when the bucket tooth surface temperature reaches 880～950 ℃, cured formwork is easy to crack to come off, easily harden after the bucket tooth water-cooled, obtain the high hardness martensitic matrix, at 230～280 ℃, insulation 8～10h, can remove the bucket tooth internal stress, stablize quenching structure, can obtain the bucket tooth of mechanical property and anti-wear performance excellence.
The present invention has following beneficial effect:
1) bucket tooth made from the present invention, production technology is easy, and raw material do not contain alloying elements such as expensive molybdenum, nickel based on the tinplate leftover pieces of cheapness, and the bucket tooth low production cost reduces more than 50% than 20CrNi2Mo bucket tooth.
2) bucket tooth smelting time of the present invention is short, and power consumption is low, the production efficiency height.
3) bucket tooth cancellation high-temperature heat treatment of the present invention is quenched, and operational sequence has been simplified in the direct entry of as cast condition, has reduced energy consumption, has shortened the production cycle.
4) the easy sand removal of bucket tooth of the present invention has alleviated labor strength
5) bucket tooth tensile strength of the present invention surpasses 1500Mpa, impact toughness (A
KU) 〉=45J, hardness 48～52HRC, wearability improves 20%～30% than 20CrNi2Mo bucket tooth.
The invention will be further described below in conjunction with the specific embodiment.
The specific embodiment
Embodiment 1
With 350kg medium-frequency induction furnace melting bucket tooth material, concrete processing step is as follows:
1) with tinplate leftover pieces, high carbon ferro-chrome, mid-carbon fe-mn, ferrosilicon, ferro-boron, ferrozirconium and ferrotianium, 96.57%, 1.5%, 1.2%, 0.4%, 0.035%, 0.045% and 0.25% be mixed in one by mass percentage respectively, and on forcing press, be compacted into the square that is of a size of 150mm * 150mm * 150mm, then the square of compacting is directly put into the electric induction furnace heating, when temperature reaches 1638 ℃, come out of the stove;
2) after molten steel leaves standstill 3min, moulding by casting in mould shell temperature is not less than 500 ℃ cured formwork;
3) reach 940 ℃ when the bucket tooth surface temperature, bucket tooth and formwork are put into water together cool off, cut the dead head on the bucket tooth subsequently, and bucket tooth is heated to 280 ℃ with stove, air cooling gets final product behind the insulation 8h, and the wear-resistant cast steel bucket tooth mechanical property sees Table 1.
| Hardness/HRC | Tensile strength/MPa | Impact toughness (A KU)/J |
| 51.3 | 1582.8 | 45.5 |
The mechanical property of table 1 wear-resistant cast steel bucket tooth
Embodiment 2
With 450kg medium-frequency induction furnace melting bucket tooth material, concrete processing step is as follows:
1) with tinplate leftover pieces, high carbon ferro-chrome, mid-carbon fe-mn, ferrosilicon, ferro-boron, ferrozirconium and ferrotianium, 96.54%, 1.8%, 0.8%, 0.6%, 0.025%, 0.055% and 0.18% be mixed in one by mass percentage respectively, and on forcing press, be compacted into the square that is of a size of 200mm * 200mm * 200mm, then the square of compacting is directly put into the electric induction furnace heating, when temperature reaches 1603 ℃, come out of the stove;
2) after molten steel leaves standstill 5min, moulding by casting in mould shell temperature is not less than 500 ℃ cured formwork;
3) reach 890 ℃ when the bucket tooth surface temperature, bucket tooth and formwork are put into water together cool off, cut the dead head on the bucket tooth subsequently, and bucket tooth is heated to 230 ℃ with stove, air cooling gets final product behind the insulation 10h, and the wear-resistant cast steel bucket tooth mechanical property sees Table 2.
| Hardness/HRC | Tensile strength/MPa | Impact toughness (A KU)/J |
| 48.6 | 1507.3 | 47.4 |
The mechanical property of table 2 wear-resistant cast steel bucket tooth
Embodiment 3
With 350kg medium-frequency induction furnace melting bucket tooth material, concrete processing step is as follows:
1) with tinplate leftover pieces, high carbon ferro-chrome, mid-carbon fe-mn, ferrosilicon, ferro-boron, ferrozirconium and ferrotianium, 96.52%, 1.65%, 1.05%, 0.50%, 0.03%, 0.05% and 0.20% be mixed in one by mass percentage respectively, and on forcing press, be compacted into the square that is of a size of 150mm * 150mm * 150mm, then the square of compacting is directly put into the electric induction furnace heating, when temperature reaches 1621 ℃, come out of the stove;
2) after molten steel leaves standstill 4min, moulding by casting in mould shell temperature is not less than 500 ℃ cured formwork;
3) reach 920 ℃ when the bucket tooth surface temperature, bucket tooth and formwork are put into water together cool off, cut the dead head on the bucket tooth subsequently, and bucket tooth is heated to 250 ℃ with stove, air cooling gets final product behind the insulation 9h, and the wear-resistant cast steel bucket tooth mechanical property sees Table 3.
| Hardness/HRC | Tensile strength/MPa | Impact toughness (A KU)/J |
| 50.4 | 1537.0 | 46.1 |
The mechanical property of table 3 wear-resistant cast steel bucket tooth
Wear-resistant cast steel bucket tooth of the present invention is applied on the excavator in metal mine, colliery, safe in utilization, easy to assembly, wearing and tearing evenly, no broken teeth phenomenon occurs, and improve 150%～200% than potassium steel bucket tooth service life, improves 20%～30% than 20CrNi2Mo bucket tooth.Bucket tooth of the present invention does not contain alloying elements such as expensive molybdenum, nickel based on the tinplate leftover pieces of cheapness, and the bucket tooth low production cost reduces more than 50% than 20CrNi2Mo bucket tooth, reduces more than 15% than potassium steel bucket tooth.Bucket tooth smelting time of the present invention is short, and power consumption is low, and Technology for Heating Processing is easy, and the production efficiency height is applied and had remarkable economical and social benefit.
Claims (1)
1, a kind of preparation method of wear-resistant cast steel bucket tooth is characterized in that, may further comprise the steps:
1) with tinplate leftover pieces, high carbon ferro-chrome, mid-carbon fe-mn, ferrosilicon, ferro-boron, ferrozirconium and ferrotianium, 96.3～97.0%, 1.5～1.8%, 0.8～1.2%, 0.4～0.6%, 0.025～0.035%, 0.045～0.055% and 0.18～0.25% be mixed in one by mass percentage respectively, and on forcing press, be compacted into the square that is of a size of (150～250) mm * (150～250) mm * (150～250) mm, then the square of compacting is put into the electric induction furnace heat fused, when liquid steel temperature reaches 1600～1640 ℃, come out of the stove;
2) after molten steel left standstill 3～5min, moulding by casting in mould shell temperature is not less than 500 ℃ cured formwork obtained bucket tooth;
3) after the bucket tooth surface temperature reaches 880～950 ℃, bucket tooth and formwork are put into water together cool off, cut the dead head on the bucket tooth subsequently, and bucket tooth is heated to 230～280 ℃ with stove, air cooling behind insulation 8～10h obtains wear-resistant cast steel bucket tooth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102468415A CN101444841B (en) | 2008-12-31 | 2008-12-31 | Method for preparing wear-resistant cast steel bucket tooth |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102468415A CN101444841B (en) | 2008-12-31 | 2008-12-31 | Method for preparing wear-resistant cast steel bucket tooth |
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| CN101444841A true CN101444841A (en) | 2009-06-03 |
| CN101444841B CN101444841B (en) | 2010-10-06 |
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| CN2008102468415A Expired - Fee Related CN101444841B (en) | 2008-12-31 | 2008-12-31 | Method for preparing wear-resistant cast steel bucket tooth |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534398A (en) * | 2012-01-06 | 2012-07-04 | 北京工业大学 | Ferroboron-containing alloy wear-resistant material and preparation method thereof |
| CN102653838A (en) * | 2012-05-10 | 2012-09-05 | 林进丰 | Method for preparing wear-resisting cast-steel bucket teeth |
| CN104818372A (en) * | 2015-05-05 | 2015-08-05 | 柳州金特新型耐磨材料股份有限公司 | Thermal-treatment method of wear-resistant bucket tooth for excavator |
-
2008
- 2008-12-31 CN CN2008102468415A patent/CN101444841B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534398A (en) * | 2012-01-06 | 2012-07-04 | 北京工业大学 | Ferroboron-containing alloy wear-resistant material and preparation method thereof |
| CN102534398B (en) * | 2012-01-06 | 2013-07-31 | 北京工业大学 | Ferroboron-containing alloy wear-resistant material and preparation method thereof |
| CN102653838A (en) * | 2012-05-10 | 2012-09-05 | 林进丰 | Method for preparing wear-resisting cast-steel bucket teeth |
| CN104818372A (en) * | 2015-05-05 | 2015-08-05 | 柳州金特新型耐磨材料股份有限公司 | Thermal-treatment method of wear-resistant bucket tooth for excavator |
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| CN101444841B (en) | 2010-10-06 |
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Granted publication date: 20101006 Termination date: 20121231 |