CN101899551A - Heat treatment technology of wear-resistant alloy cast steel - Google Patents
Heat treatment technology of wear-resistant alloy cast steel Download PDFInfo
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Abstract
The invention relates to a heat treatment technology of wear-resistant alloy cast steel, wherein the cast steel comprises the following chemical components and mass percentages: 0.27-0.32% of C; 0.70-0.90% of Mn; 0.90-1.30% of Si; 1.40-1.80% of Cr; 0.10-0.20% of Mo; 0.10-0.20% of Ni; and 0.02-0.03% of Ti. The heat treatment technology comprises the following steps: preserving temperature in an annealing furnace for 3-5 hours at 850-9000 DEG C and then air cooling after getting out of the furnace; preserving temperature in a quenching furnace for 150 minutes at 900+/-10 DEG C and then getting out; cooling the wear-resistant alloy cast steel to about 300 DEG C with quenching liquid; and finally preserving temperature in a tempering furnace for 3-4 hours at 200-230 DEG C and getting out for air cooling. The processed wear-resistant alloy cast steel can be used for manufacturing engineering mechanical apparatus contacted with frozen rock and frozen soil layer.
Description
Technical field
The present invention relates to a kind of thermal treatment process of wear-resistant alloy cast steel, particularly, have the thermal treatment process of the wear-resistant alloy cast steel of superelevation hard toughness at can be used on the open-air winning apparatus, can being suitable for severe environment requirements such as high strength, low temperature.
Background technology
Wearing and tearing are many industrial sector ubiquities and become a major reason that causes equipment failure or material damage that it has also consumed a large amount of energy and material simultaneously.The various engineering excavation machines of being made by wear-resistant alloy cast steel and shovel loader bucket tooth, various wear resistant conveying pipes road, various grinder hammerhead and jaw, various grip-pad, owing to be in working conditions such as high strength, atrocious weather, its wear pattern is more serious.
The present state of the art is: a class is to emphasize the high tenacity of material, and a class is to emphasize the resistance to abrasion of material.And can't reach an effectively unification, especially in the application that is used on the engineering machinery such as outdoor mining, excavation.The wear resistance of high mangaenese steel is with good conditionsi, and its yield strength is low, easily deformable; Low, interalloy wear resisting steel has better strength and toughness, and the wear resistance under low, the middle shock load is better than high mangaenese steel, but has hardening capacity and the low problem of hardenability, and wear resistance is relatively poor; Contain in the rich chromium cast iron tissue and surpass 20% high rigidity eutectic carbides, have excellent abrasive, have the yielding rimose deficiency of alloying element content height, production cost height and high-temperature heat treatment; Ordinary white cast iron and low-alloy chilled cast iron carbide hardness are low, and carbide is continuous shape and distributes, and fragility is big, easily peel off in the use even ftracture.
At present situation, obtain that a kind of production technique is simple, cost is low, obdurability is high, hardening capacity and hardenability be good and pollution-free, guarantee the works fine in low temperature environment simultaneously, and the wear-resistant alloy cast steel that also can well use under the condition of multiplex (MUX) ore deposit has become a technical problem.Simultaneously people recognize that also the thermal treatment process that provides a kind of new alloying constituent with wear-resistant alloy cast steel to adapt is not only the sport technique segment of making wear-resistant alloy cast steel, simultaneously, rational heat treatment technology also will have positive effect to the mechanical property of wear-resistant alloy cast steel, alloying constituent is used more effectively.
Summary of the invention
For solving the problems of the technologies described above, the invention provides a kind of thermal treatment process that is suitable for mutually with New-type wear-resistant alloy cast steel: the chemical ingredients of wherein said New-type wear-resistant alloy cast steel and mass percent thereof are: C:0.27-0.32; Mn:0.70-0.90; Si:0.90-1.30; Cr:1.40-1.80; Mo:0.10-0.20; Ni:0.10-0.20; Ti:0.02-0.03, described thermal treatment process comprises:
1, annealing: it is 850 ℃ of-900 ℃ of annealing furnaces that described wear-resistant alloy cast steel is placed temperature, is incubated 3-5 hour and comes out of the stove, then air cooling;
2, quench: quenching is taken out in the quenching furnance insulation that described wear-resistant alloy cast steel places temperature to be controlled at 900 ℃ ± 10 ℃ after 150 minutes, heat-eliminating medium is a water-soluble quenching liquid, and wear-resistant alloy cast steel is cold to be caused about 300 ℃;
3, tempering: it is tempering stove to 200-230 ℃ that described wear-resistant alloy cast steel is placed temperature, is incubated 3-4 hour and takes out air cooling.
After the above-mentioned thermal treatment of wear-resistant alloy cast steel process of the present invention, its tensile strength: 1500-1800MPa, yield strength: 1200-1400MPa, unit elongation: δ s 7-15%, v-notch impelling strength Akv25-40J, hardness: 48-55HRC.And be suitable in low temperature environment, as-20 ℃-0 ℃, and freeze the wear-resistant engineering machinery equipment that rock, frozen soil layer contact, adapt to requirement in the medium-term and long-term work of cold belt environment.
Embodiment
The invention provides a kind of thermal treatment process that is suitable for mutually with New-type wear-resistant alloy cast steel, the chemical ingredients of wherein said cast steel and mass percent thereof are: C:0.27-0.32; Mn:0.70-0.90; Si:0.90-1.30; Cr:1.40-1.80; Mo:0.10-0.20; Ni:0.10-0.20; Ti:0.02-0.03.Wherein the major function that each alloy had is:
Carbon (C): carbon content is high more, and the intensity of steel and hardness value increase, and plasticity and toughness value reduce;
Silicon (Si): reinforced ferrite, improve tensile strength and yield strength, improve thermotolerance and solidity to corrosion, reduce toughness and plasticity;
Manganese (Mn): improve intensity, hardness and wear resistance;
Chromium (Cr): reduce the thermal conductivity of steel, can improve wear resistance;
Molybdenum (Mo): reinforced ferrite, improve high-temperature behavior, improve fragility;
Nickel (Ni): enlarging the austenitic area, is the effective element of austenitizing, improves intensity and does not significantly reduce plasticity, and good corrosion resistance is arranged;
Ferrotianium (Ti): can reinforced ferrite, deoxidation and crystal grain thinning.
Carry out the thermal treatment process of following order at above-mentioned wear-resistant alloy cast steel:
1, annealing: it is 850 ℃ of-900 ℃ of annealing furnaces that described wear-resistant alloy cast steel is placed temperature, is incubated 3-5 hour and comes out of the stove, then air cooling;
It is the push-down annealing furnace that preferred embodiment adopts annealing furnace, RJT-150-8 push-down isothermal annealing stove for example, and it is divided into 7 heating zone, and each Heating Zone Temperature is set at 850 ℃-900 ℃.The wear-resistant alloy cast steel wear-resistant alloy cast steel that a plurality of sizes that are prefabricated into annealing furnace adapt is according to batch by above-mentioned 7 heating zone, and be heated intensification, and successive is incubated in above-mentioned 7 heating zone successively, so that the wear-resistant alloy cast steel wear-resistant alloy cast steel obtains the soaking time of useful length in annealing furnace.Heating zone quantity also can be other quantity, its determine according to one of be to adapt time with the required heating of wear-resistant alloy cast steel, to guarantee the requirement that adds heat request and large scale continuous prod of wear-resistant alloy cast steel.
For reaching the purpose of automatic production and more effective control annealing operation, in 7 above-mentioned heating zone, can be provided with device for monitoring temperature simultaneously, with demonstration, record and the remote reporting of realization temperature, and the further timely adjustment that realizes the annealing furnace temperature.Preferably, one, two, three, four, the slender acanthopanax hot-zone adopts the TCW-32A three phase voltage regulating, six or seven districts are with digital displaying meter temperature indicating degree, and each is distinguished all EL-100-60 multipoint recorder displayed record temperature.The wear-resistant alloy cast steel wear-resistant alloy cast steel is come out of the stove after 3-5 hour in insulation, carries out air cooling then.
2, quench: quenching is taken out in the quenching furnance insulation that described wear-resistant alloy cast steel places temperature to be controlled at 900 ℃ ± 10 ℃ after 150 minutes, heat-eliminating medium is a water-soluble quenching liquid, and wear-resistant alloy cast steel is cold to be caused about 300 ℃;
Preferred embodiment adopts casting chain-plate type quenching furnance, is made up of 5 heating zone, and each Heating Zone Temperature controls to 900 ℃ ± 10 ℃.The wear-resistant alloy cast steel insulation was taken out and is inserted quenching tank after 150 minutes, quenched.Can be provided with device for monitoring temperature in each heating zone, with demonstration, record and the remote reporting of realization temperature, and the further timely adjustment that realizes the quenching furnance temperature.Preferably, each heating zone can be provided with the master control of digital display intelligent temperature controller, multipoint recorder centralized recording and monitoring.In addition, heating zone quantity also can be other quantity, its determine according to one of be to adapt time with the required heating of wear-resistant alloy cast steel, to guarantee the requirement that adds heat request and large scale continuous prod of wear-resistant alloy cast steel.
The heat-eliminating medium that adopts that quenches is a water-soluble quenching liquid.Preferably is furnished with PVA10%, three hexanol amine 1%, phenylformic acid receives 0.2%, the water-soluble quenching liquid of alizarin assistant 0.2%, the quenchant system can adopt has the higher systemic circulation form of automatic capability, and is furnished with special agitating function, guarantees supplying with stable continuously of hardening liquid, temperature before hardening liquid quenches can be normal temps, for example below 30 degree.Wear-resistant alloy cast steel can be detained 8-25 minute time span according to different situations in hardening liquid, cause about 300 ℃ so that wear-resistant alloy cast steel is cold, by quenching tank lift travelling belt wear-resistant alloy cast steel is sent quenching tank then.
3, tempering: it is tempering stove to 200-230 ℃ that described wear-resistant alloy cast steel is placed temperature, is incubated 3-4 hour and takes out air cooling.
The preferred net belt type tempering stove that adopts: is made up of 5 heating zone, each Heating Zone Temperature is raised to 200-230 ℃, be incubated 3-4 hour taking-up air cooling.The quantity of heating zone can be selected other quantity equally for these reasons, and each heating zone can be provided with the master control of digital display intelligent temperature controller, and the multipoint recorder centralized recording is also monitored the equitemperature monitoring device, to realize demonstration, record and the remote reporting of temperature.
Above-mentioned thermal treatment process can be carried out long-range and on-the-spot process control to its whole process by the automatic control system and the method that adapt with its technology, guarantees carrying out smoothly and reaching required mechanical property of thermal treatment process.
After the above-mentioned thermal treatment of wear-resistant alloy cast steel process of the present invention, its tensile strength: 1500-1800MPa, yield strength: 1200-1400MPa, unit elongation: δ s 7-15%, v-notch impelling strength Akv25-40J, hardness: 48-55HRC.
The announcement of the technical scheme by above-mentioned steel alloy as seen, the steel alloy among the present invention has: production technique is simple, cost is low, obdurability is high, hardening capacity and hardenability is good and free of contamination novel product.And be suitable in low temperature environment, as-20 ℃-0 ℃, and freeze the engineering mechanical device that rock, frozen soil layer contact, adapt to requirement in the medium-term and long-term work of cold belt environment.
The embodiment that is disclosed among the present invention will obtain embodying and protection by claim, any according to the present invention in resulting enlightenment, among the scope that all falls into the present invention and protected.
Claims (7)
1. the thermal treatment process of a wear-resistant alloy cast steel is characterized in that:
The chemical ingredients of described cast steel and mass percent thereof are: C:0.27-0.32; Mn:0.70-0.90; Si:0.90-1.30; Cr:1.40-1.80; Mo:0.10-0.20; Ni:0.10-0.20; Ti:0.02-0.03;
Described thermal treatment process comprises:
1) annealing: it is 850 ℃ of-900 ℃ of annealing furnaces that described wear-resistant alloy cast steel is placed temperature, is incubated 3-5 hour and comes out of the stove, then air cooling;
2) quench: quenching is taken out in the quenching furnance insulation that described wear-resistant alloy cast steel places temperature to be controlled at 900 ℃ ± 10 ℃ after 150 minutes, heat-eliminating medium is a water-soluble quenching liquid, and wear-resistant alloy cast steel is cold to be caused about 300 ℃;
3) tempering: it is tempering stove to 200-230 ℃ that described wear-resistant alloy cast steel is placed temperature, is incubated 3-4 hour and takes out air cooling.
2. the thermal treatment process of wear-resistant alloy cast steel according to claim 1, it is characterized in that: the tensile strength of described wear-resistant alloy cast steel: 1500-1800MPa, yield strength: 1200-1400MPa, unit elongation: δ s7-15%, v-notch impelling strength Akv25-40J, hardness: 48-55HRC.
3. the thermal treatment process of wear-resistant alloy cast steel according to claim 1 and 2 is characterized in that: described wear-resistant alloy cast steel is applicable to make and is used under-20 ℃-0 ℃ environment and freezes the engineering mechanical device that rock, frozen soil layer contact.
4. the thermal treatment process of wear-resistant alloy cast steel according to claim 1, it is characterized in that: described annealing furnace, quenching furnance or tempering stove can have a plurality of heating zone.
5. the thermal treatment process of wear-resistant alloy cast steel according to claim 4 is characterized in that: described each heating zone can have the device for monitoring temperature that is used for described heating zone is realized demonstration, record and the remote reporting of temperature.
6. the thermal treatment process of wear-resistant alloy cast steel according to claim 1, it is characterized in that: described water-soluble quenching liquid contains PVA10%, three hexanol amine 1%, phenylformic acid receives 0.2%, alizarin assistant 0.2%.
7. the thermal treatment process of wear-resistant alloy cast steel according to claim 1, it is characterized in that: the time of described wear-resistant alloy cast steel in described water-soluble quenching liquid is 8-25 minute.
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| CN2009102036312A CN101899551B (en) | 2009-05-26 | 2009-05-26 | Heat treatment technology of wear-resistant alloy cast steel |
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| CN102296241A (en) * | 2011-08-16 | 2011-12-28 | 山西中条山建筑有限公司机电设备制造安装分公司 | Low carbon alloy cast steel and preparation method thereof |
| CN102877008A (en) * | 2012-10-09 | 2013-01-16 | 西安交通大学 | Method for preparing bainite wear-resistant cast steel |
| CN102899586A (en) * | 2012-11-09 | 2013-01-30 | 宁波市鄞州商业精密铸造有限公司 | Iron alloy material and preparation method |
| CN102936697A (en) * | 2012-11-09 | 2013-02-20 | 宁波市鄞州商业精密铸造有限公司 | Method for preparing high abrasion-resistance ferroalloy material |
| CN102936696A (en) * | 2012-11-09 | 2013-02-20 | 宁波市鄞州商业精密铸造有限公司 | High hardness and high abrasion-resistance ferroalloy material and preparation method thereof |
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| CN103725990A (en) * | 2014-01-21 | 2014-04-16 | 湖南红宇耐磨新材料股份有限公司 | Wear-resisting cast steel |
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| FR2727981B1 (en) * | 1994-12-13 | 1997-01-10 | Ascometal Sa | METHOD FOR MANUFACTURING A PART OF MECHANICAL CONSTRUCTION STEEL AND A PART THUS MANUFACTURED |
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| CN102296241A (en) * | 2011-08-16 | 2011-12-28 | 山西中条山建筑有限公司机电设备制造安装分公司 | Low carbon alloy cast steel and preparation method thereof |
| CN102877008A (en) * | 2012-10-09 | 2013-01-16 | 西安交通大学 | Method for preparing bainite wear-resistant cast steel |
| CN102899586A (en) * | 2012-11-09 | 2013-01-30 | 宁波市鄞州商业精密铸造有限公司 | Iron alloy material and preparation method |
| CN102936697A (en) * | 2012-11-09 | 2013-02-20 | 宁波市鄞州商业精密铸造有限公司 | Method for preparing high abrasion-resistance ferroalloy material |
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