CN103484772B - A kind of excavator toothholder and preparation method thereof - Google Patents
A kind of excavator toothholder and preparation method thereof Download PDFInfo
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- CN103484772B CN103484772B CN201310406743.4A CN201310406743A CN103484772B CN 103484772 B CN103484772 B CN 103484772B CN 201310406743 A CN201310406743 A CN 201310406743A CN 103484772 B CN103484772 B CN 103484772B
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- excavator
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Abstract
The present invention relates to a kind of excavator toothholder and preparation method thereof, the moiety of this excavator toothholder and mass percent are: C:0.17% ~ 0.21%, Mn:1.00% ~ 1.40%, Si:1.10% ~ 1.40%, Cr:1.20% ~ 1.50%, Al:0.02% ~ 0.05%, surplus is Fe and inevitable impurity.In impurity, the mass percent of S element is less than 0.03%, and the mass percent of P element is less than 0.03%.Its preparation method comprises casting technique and thermal treatment process, and the quenching temperature in thermal treatment process is 910-930 DEG C, and after quenching, soaking time is 2-4 hour, and tempering temperature is 230-250 DEG C, and after tempering, soaking time is 2-4 hour.Excavator toothholder welding property prepared by the present invention, impact toughness at room temperature are better, and hardness is higher, and wear resistance is good, long service life.
Description
Technical field
The present invention relates to a kind of toothholder and preparation method thereof, particularly relate to a kind of excavator toothholder and preparation method thereof, belong to metal material field.
Background technology
Bucket tooth, toothholder are one of main wear parts of shovel loader, excavator.At present in the large-scale fundamental construction of China, the usage quantity of excavator, shovel loader constantly increases, and bucket tooth, toothholder directly contact with sand, soil, rock, mineral etc. in operation process, and be subject to serious abrasive wear, consumption is very large.For extending excavator toothholder and crown life-span, reduce cost, the function different with crown according to toothholder, the novel material of exploitation toothholder and crown, has important economic implications.Wherein, crown is owing to directly contacting with ore, and it needs high rigidity, high-wearing feature and high strength and high tenacity.Toothholder then requires good weldability, to ensure the reliability of weld bond intensity and welding, ensures higher toughness and hardness simultaneously.
About excavator toothholder and preparation method thereof, have been reported in prior art, as Chinese invention patent (publication number: CN102418040A) relates to a kind of toothholder and preparation method thereof, the moiety of this toothholder and mass percent are: C:0.19%-0.22%, Mn:0.80%-1.10%, Si:0.30%-0.60%, Cr:0.30%-0.60%, Al:0.02%-0.06%, surplus is Fe and inevitable impurity.The hardness (HB) of this toothholder only has 250-350, and impact toughness at room temperature only has 12-20J/cm
2, all relatively low, therefore the wearing and tearing of this toothholder are very fast, work-ing life is short.
Summary of the invention
The present invention is directed to the defect existing for prior art, provide a kind of welding property, impact toughness at room temperature better, the excavator toothholder that hardness is higher.
Above-mentioned purpose of the present invention realizes by following technical proposal: a kind of excavator toothholder, the moiety of toothholder and mass percent are: C:0.17% ~ 0.21%, Mn:1.00% ~ 1.40%, Si:1.10% ~ 1.40%, Cr:1.20% ~ 1.50%, Al:0.02% ~ 0.05%, surplus is Fe and inevitable impurity.
Excavator toothholder of the present invention is that Fe and inevitable impurity are obtained by reasonable compatibility by C, Mn, Si, Cr, Al, surplus.The present invention, under the prerequisite of welding property not affecting steel, improves the content of Si, significantly improves intensity and the resistance to tempering of excavator toothholder.In addition, invention also improves the mass percent of Cr in excavator toothholder, reduce the mass percent of S, P further.The excavator toothholder that the present invention is prepared has good welding property, and hardness, intensity, impact toughness at room temperature are significantly improved simultaneously, and toothholder wear resistance is strengthened, and work-ing life extends.
C element is as the fundamental element of steel alloy, and along with C content increases, alloy Yield Of Steel and tensile strength raise, and C element and Fe, Mn form carbide, improve the hardness of steel alloy.But C content is too high, plasticity and the impelling strength of steel alloy reduce on the contrary, but also can reduce the atmospheric corrosion resistance ability of steel alloy, and place is with regard to easy-to-rust in the open.In addition, C element is the maximum element affecting steel alloy welding property, and when C content is more than 0.23%, the welding property of steel alloy is deteriorated.C content of the present invention, in 0.17% ~ 0.21% scope, belongs to soft steel scope, and therefore the present invention can ensure the welding property of excavator toothholder, can ensure again the hardness of excavator toothholder, plasticity, impelling strength and corrosion resistance etc.
Mn, in steelmaking process, is good reductor and sweetening agent, and in general steel, violent content only has 0.30%-0.50%.Even if when adding more than 0.70% in carbon steel " manganese steel ", the steel that manganese steel is more general not only has enough toughness, and higher intensity and hardness also can improve the quenching property of steel, improve the hot workability of steel.Mn still expands the element of austenitic area, is conducive to obtaining residual austenite.But violent too high levels, can weaken the resistance to corrosion of excavator toothholder equally, reduces its welding property.Mn content of the present invention, in 1.00% ~ 1.40% scope, both can make excavator toothholder have enough toughness, intensity and hardness, and also can ensure the welding property of excavator toothholder, corrosion resistance and processing characteristics.
Si, in steelmaking process, is good reductive agent and reductor.Si can significantly improve the elastic limit of steel, toughness, intensity, yield-point and tensile strength.In steel, add the Si of 1.0%-1.2%, intensity can improve 15%-20%.The Si adding high level during alloying can increase residual austenite content in the stability of supercooled austenite and steel in continuous cooling process, and the strong precipitation hindering carbide, improves steel belt roof bolt drag.Equally, Si too high levels can reduce the welding property of steel.Therefore, the Si content in excavator toothholder controls 1.10% ~ 1.40% by the present invention, makes the welding property of excavator toothholder and mechanical property be obtained for guarantee.
Cr, as important alloying element, can significantly improve the intensity of steel, hardness and wear resistance, can also improve oxidation-resistance and the erosion resistance of steel, but can reduce plasticity and the toughness of steel simultaneously.In steel alloy, add Cr element can change carbide dispersion distributional pattern in steel, obtain with Cr
23c
6be main granular carbide, make its Dispersed precipitate on Ovshinsky matrix.The Cr content of excavator toothholder of the present invention is 1.20% ~ 1.50%, can make that the intensity of excavator toothholder, hardness, wear resistance, plasticity are relative with toughness reaches optimum.
Al is reductor conventional in steel, adds a small amount of Al in steel, can crystal grain thinning, improves impelling strength.Al also has antioxidant and corrosion resistance, and A1 and Si share, and can significantly improve high temperature non-scale performance and the high-temperature corrosion resistance performance of steel.But Al can affect the hot workability of steel, welding property and machinability.Therefore, the A1 content of excavator toothholder of the present invention controls 0.02% ~ 0.05%, while the over-all properties improving excavator toothholder, can not cause too large impact again to welding property, processing characteristics.
As preferably, in described impurity, the mass percent of S element is less than 0.03%, and the mass percent of P element is less than 0.03%.
S is harmful element in steel in the ordinary course of things, makes steel produce red brittleness, reduces ductility and the toughness of steel, causes crackle when forging and rolling.S is also unfavorable to welding property, and reduce erosion resistance, in high-quality steel, S content is less than 0.04%.And in steel, add a small amount of S, the processing characteristics of steel can be improved.So the mass percent of S element of the present invention controls below 0.03%, and not only the over-all properties of excavator toothholder is guaranteed, and processibility also has some improvement.
P is also harmful element in the ordinary course of things in steel, can increase the cold shortness of steel, and the welding property of steel is deteriorated, and reduce plasticity, cold-bending property degenerates, and therefore generally P content controls below 0.045% in steel.In excavator toothholder of the present invention, the mass percent of P element is controlled below 0.03%, make P element almost there is no deleterious effect to excavator toothholder, thus make the excavator toothholder over-all properties that obtains better.
As preferably, moiety and the mass percent of described excavator toothholder are: C:0.19%, Mn:1.20%, Si:1.20%, Cr:1.40%, Al:0.04%, and surplus is Fe and inevitable impurity.
As preferably, moiety and the mass percent of described excavator toothholder are: C:0.18%, Mn:1.30%, Si:1.30%, Cr:1.30%, Al:0.05%, and surplus is Fe and inevitable impurity.
As preferably, moiety and the mass percent of described excavator toothholder are: C:0.17%, Mn:1.10%, Si:1.10%, Cr:1.20%, Al:0.03%, and surplus is Fe and inevitable impurity.
Another object of the present invention is the preparation method providing excavator toothholder, this preparation method comprises casting technique and thermal treatment process, it is characterized in that, in described thermal treatment process, quenching temperature is 910-930 DEG C, after quenching, soaking time is 2-4 hour, and tempering temperature is 230-250 DEG C, and after tempering, soaking time is 2-4 hour.
Quenching temperature is between 910 DEG C-930 DEG C, tempering temperature is between 230 DEG C-250 DEG C, and tensile strength and the hardness of excavator toothholder reduce with the rising of tempering temperature, and impact toughness at room temperature then raises.Low-carbon alloy steel carries out the quenching of austenitizing heat chilling, and can to obtain hardness moderate, and rigidity is good, the low-carbon lath martensite tissue of obdurability.In invar, during the quenching of " C " element, segregation, in dislocation and lath boundaries, causes substructure refinement and high density dislocation to produce solution strengthening.Low-carbon lath martensite is under an electron microscope in lath-shaped distribution parallel to each other, and its main body is made up of the crystal of much thin and thin length, without twin in lath.And when tempering temperature is greater than 250 DEG C, dislocation generation slippage and climbing, causes dislocation desity to reduce, crystal boundary is moved simultaneously, and subgrain merges and causes the every mechanical property of toothholder to decline.
As preferably, in described thermal treatment process, quenching temperature is 920 DEG C, and tempering temperature is 240 DEG C.
The present invention has the following advantages:
1. the excavator toothholder welding property, the impact toughness at room temperature that obtain of the present invention is better, and hardness is higher.
2. good, the long service life of the excavator toothholder wear resistance that obtains of the present invention.
Embodiment
Be below specific embodiments of the invention, technical scheme of the present invention is further described, but the present invention is not limited to these embodiments.
The component of table 1 embodiment 1-3 excavator toothholder and mass percent thereof
Embodiment 1:
Excavator toothholder is prepared according to each component of embodiment in table 11 and mass percent thereof, the component of excavator toothholder and the mechanical property of percent mass comparison toothholder thereof have a certain impact, and the mechanical property of its preparation technology on the final excavator toothholder formed also has larger impact.The preparation technology of excavator toothholder comprises casting technique and thermal treatment process, wherein casting technique adopt conventional casting, to the final mechanical impact of excavator toothholder maximum be thermal treatment process.Thermal treatment process comprises that quenching heats up, tempering after insulation, the step of air cooling after tempering.Arranging quenching temperature is respectively 910 DEG C, 920 DEG C, 930 DEG C, and tempering after insulation, tempering temperature is set to 230 DEG C, 240 DEG C and 250 DEG C respectively, prepares excavator toothholder, and tests its mechanical property, and test result is as shown in table 2 below.
The mechanical property of the excavator toothholder under table 2 embodiment 1 different condition after thermal treatment
Embodiment 2:
Excavator toothholder is prepared according to each component of embodiment in table 12 and mass percent thereof, the component of excavator toothholder and the mechanical property of percent mass comparison toothholder thereof have a certain impact, and the mechanical property of its preparation technology on the final excavator toothholder formed also has larger impact.The preparation technology of excavator toothholder comprises casting technique sequence and thermal treatment process, wherein casting technique adopt conventional casting, to the final mechanical impact of excavator toothholder maximum be thermal treatment process.Thermal treatment process comprises that quenching heats up, tempering after insulation, the step of air cooling after tempering.Arranging quenching temperature is respectively 910 DEG C, 920 DEG C, 930 DEG C, and tempering after insulation, tempering temperature is set to 230 DEG C, 240 DEG C and 250 DEG C respectively, prepares excavator toothholder, and tests its mechanical property, and test result is as shown in table 3 below.
The mechanical property of the excavator toothholder under table 3 embodiment 2 different condition after thermal treatment
Embodiment 3:
Excavator toothholder is prepared according to each component of embodiment in table 13 and mass percent thereof, the component of excavator toothholder and the mechanical property of percent mass comparison excavator teeth seat thereof have a certain impact, and the mechanical property of its preparation technology on the final toothholder formed also has larger impact.The preparation technology of excavator toothholder comprises casting technique and thermal treatment process, wherein casting technique adopt conventional casting, to the final mechanical impact of excavator toothholder maximum be thermal treatment process.Thermal treatment process comprises that quenching heats up, tempering after insulation, the step of air cooling after tempering.Arranging quenching temperature is respectively 910 DEG C, 920 DEG C, 930 DEG C, and tempering after insulation, tempering temperature is set to 230 DEG C, 240 DEG C and 250 DEG C respectively, prepares excavator toothholder, and tests its mechanical property, and test result is as shown in table 4 below.
The mechanical property of the excavator toothholder under table 4 embodiment 3 different condition after thermal treatment
Comparative example:
Moiety and the mass percent of choosing excavator toothholder in Chinese invention patent (publication number: CN102418040A) are: C:0.20%, Mn:1.0%, Si:0.4%, Cr:0.4%, Al:0.03%, surplus is Fe.Meanwhile, the mass percent of S element is less than or equal to 0.035%, and the mass percent of P element is less than or equal to 0.035% for comparative example.Excavator toothholder is through casting technique and thermal treatment process, wherein thermal treatment process adopts technique ideal in this inventive embodiments, quench after being warming up to 900 DEG C and tempering under the tempering temperature of 220 DEG C to 250 DEG C after being incubated 2-4 hour, again 2-4 hour is incubated after tempering, prepare excavator toothholder, and its mechanical property is tested, and the thermal treatment process ideal with embodiment of the present invention 1-3: quench after being warming up to 920 DEG C and be incubated 2-4 hour, the excavator teeth base tool the performance test results obtained in the tempering temperatures of 230 DEG C to 250 DEG C fire preparing next time contrasts, result is as shown in table 5.
Table 5 embodiment 1-3 and comparative example excavator teeth base tool the performance test results contrast
As known from Table 5, the excavator toothholder hardness (HRC) that the present invention prepares reaches 38-42, higher than comparative example hardness; Tensile strength and impact toughness at room temperature are far above comparative example.The excavator toothholder over-all properties that the present invention prepares is more superior, is more suitable for excavator and uses.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Although made a detailed description the present invention and quoted some specific embodiments as proof, to those skilled in the art, only otherwise it is obvious for leaving that the spirit and scope of the present invention can make various changes or revise.
Claims (4)
1. an excavator toothholder, it is characterized in that, moiety and the mass percent of described excavator toothholder are: C:0.17% ~ 0.21%, Mn:1.00% ~ 1.40%, Si:1.10% ~ 1.40%, Cr:1.20% ~ 1.50%, Al:0.02% ~ 0.05%, surplus is Fe and inevitable impurity, in described impurity, the mass percent of S element is less than 0.03%, and the mass percent of P element is less than 0.03%;
The preparation method of described excavator toothholder comprises casting technique and thermal treatment process, and in described thermal treatment process, quenching temperature is 920 DEG C, and Quenching Soaking Time is 2-4 hour, and tempering temperature is 240 DEG C, and tempering insulation time is 2-4 hour.
2. a kind of excavator toothholder according to claim 1, is characterized in that, moiety and the mass percent of described excavator toothholder are: C:0.19%, Mn:1.20%, Si:1.20%, Cr:1.40%, Al:0.04%, surplus is Fe and inevitable impurity.
3. a kind of excavator toothholder according to claim 1, is characterized in that, moiety and the mass percent of described excavator toothholder are: C:0.18%, Mn:1.30%, Si:1.30%, Cr:1.30%, Al:0.05%, surplus is Fe and inevitable impurity.
4. a kind of excavator toothholder according to claim 1, is characterized in that, moiety and the mass percent of described excavator toothholder are: C:0.17%, Mn:1.10%, Si:1.10%, Cr:1.20%, Al:0.03%, surplus is Fe and inevitable impurity.
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| CN201310406743.4A CN103484772B (en) | 2013-09-05 | 2013-09-05 | A kind of excavator toothholder and preparation method thereof |
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| CN104593685B (en) * | 2014-12-29 | 2016-11-23 | 宁波市胜源技术转移有限公司 | A kind of excavator toothholder and preparation method thereof |
| CN105369156A (en) * | 2015-11-18 | 2016-03-02 | 宁波瑞尔汽车零部件有限公司 | Manufacturing method of screw |
| CN105420633A (en) * | 2015-11-18 | 2016-03-23 | 宁波瑞尔汽车零部件有限公司 | Screw |
| CN113215376B (en) * | 2021-04-28 | 2021-10-15 | 徐工集团工程机械股份有限公司科技分公司 | Loader bucket tooth and heat treatment method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102418040A (en) * | 2011-11-13 | 2012-04-18 | 宁波嘉达精密铸造有限公司 | Toothholder and manufacturing method thereof |
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| JPS581062A (en) * | 1981-06-26 | 1983-01-06 | Mitsubishi Heavy Ind Ltd | Corrosion- and abrasion-resistant cast steel |
| KR100445890B1 (en) * | 2002-01-08 | 2004-08-25 | 주식회사 세아베스틸 | A wear resisting steel and a method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102418040A (en) * | 2011-11-13 | 2012-04-18 | 宁波嘉达精密铸造有限公司 | Toothholder and manufacturing method thereof |
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