CN103060704A - Preparation method of low-alloy high-wear-resistance cast steel - Google Patents

Preparation method of low-alloy high-wear-resistance cast steel Download PDF

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CN103060704A
CN103060704A CN2013100406044A CN201310040604A CN103060704A CN 103060704 A CN103060704 A CN 103060704A CN 2013100406044 A CN2013100406044 A CN 2013100406044A CN 201310040604 A CN201310040604 A CN 201310040604A CN 103060704 A CN103060704 A CN 103060704A
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iron
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马丁青
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The invention relates to a preparation method of low-alloy high-wear-resistance steel cast. The low-alloy high-wear-resistance steel cast comprises the following components: 0.25-0.35 wt.% of C, 0.9-1.6 wt.% of Si, 0.3-1.8 wt.% of Mn, 0.7-1.0 wt.% of Cr, 0.15-0.3wt.% of Mo, 0.05-0.35wt.% of Ti, 0.01-0.05 wt.% of Nb, 0.05-0.25 wt.% of V, 0.01-0.1 wt.% of RE, at most 0.03 wt.% of P and S, and the balance of Fe. The preparation method comprises the following steps: melting the components, casting to form, heating the treated casting, and keeping the temperature when the temperature reaches 1050-1070 DEG C; and after finishing keeping the temperature, putting the casting in a 240-245 DEG C salt bath furnace, keeping the temperature, discharging, and cooling in air. The casting and heat treatment technique is simple and easy to control and low in cost; and the prepared material has favorable toughness compatibility.

Description

A kind of preparation method of low-alloy high abrasion cast steel
Technical field
The present invention relates to a kind of wearable cast steel manufacturing technology of under shock action, using, particularly a kind of preparation method of low-alloy high abrasion cast steel.
Background technology
Wearing and tearing are phenomenons common in industrial circle and the daily life, also are major reasons that causes material and energy loss, and this ancient and complicated problem is one of focus of paying close attention to of people always.Wearing and tearing are one of material main failure forms, and the financial loss that it causes is very huge.Such as the numeral of announcing U.S. eighties, the annual because loss that wearing and tearing cause is up to 1,000,000,000 dollars, and USSR (Union of Soviet Socialist Republics) is because the loss that wearing and tearing cause reaches 12,000,000,000 roubles every year, and the loss that cause because of frictional wear the Germany is annual above 10,000,000,000 DM.China still lacks comprehensive statistics at present, but the report of each side shows, because the wear resistance of material is relatively poor, the wear-out life of a large amount of fundamental parts of China significantly is lower than the level of developed countries product, and therefore directly or indirectly financial loss is very surprising.Only in the incomplete statistics of the industries such as metallurgy, the energy, mine, building materials, take broken material as example.Annual 1200000 tons of consumption abrading-balls, 400,000 tons of the liner plates of needing.Amount to approximately more than 70 hundred million yuan of Renminbi.The work-ing life of therefore how to improve wearing piece.The development of new high-abrasive material has become the key subjects of domestic and international research and production department's urgent need solution.At present, in the industry production such as the mine of China, colliery, oil field, electric power, external advanced mining engineering machinery occupies larger proportion.According to statistics, need to just reach 1,000,000 tons every year from the wear-resisting spare part of providing by import abroad, is equivalent to hundred million yuan of 15-20.Therefore, the research abrasion resistance material realizes that the production domesticization of import abrasion-proof accessories has important society and economic implications.
Because the complicacy of frictional wear not yet finds a kind of desirable wear-resistant material so far.Use at present both at home and abroad wear-resistant material to be divided into substantially following three classes: casting high mangaenese steel, alloy abrasion resistant steel, casting white cast iron etc.
The high mangaenese steel wear-resistant material: high mangaenese steel composition range roughly is 0.9-1.2% Fe, 11-14% Mn, and 0.3-1.0 % Si, oneself has the developing history in over one hundred year, adopts so far always.Be organized as single-phase austenite after the tough processing of casting high mangaenese steel water, have lower intensity and the incomparable HI high impact toughness values of other cast material.Talk about confused altar publicly about the Antiwear Mechanism of high mangaenese steel, mainly contain following three kinds of viewpoints: (1) cold working hardening effect.Strong cold working hardening occurs in high mangaenese steel under external force, and surface hardness sharply increases.2) stress-induced martensite transformation hardening.High mangaenese steel is under stress.Martensitic transformation occurs in the top layer, forms martensite, and hardness is brought up to HB600 by HB220 originally.(3) fold the carbide that disperse distributes by adding the thermal treatment of alloying element precipitation hardening, improve its wear resistance.Although under test conditions, martensite occurs in the unlikely high mangaenese steel surface of once having found after wearing and tearing, such result is seldom arranged under the actual production conditions.If high mangaenese steel work hardening effect can not be given full play to, under at low-stress state, use, wear resistance is lower, not even as carbon steel or steel alloy.At present people study the high mangaenese steel of modification, such as superhigh manganese alloy steel, and dispersion hardening high mangaenese steel, micro-alloyed high manganese steels etc. try hard to improve yield strength and the wear resistance of high mangaenese steel.
Except Gao Meng, mainly contain low, interalloy wear resisting steel and high-alloy wear-resisting steel: the alloying element of adding mainly contains silicon, manganese, chromium, molybdenum, vanadium, tungsten and nickel etc.One of Main Function of these alloying elements is to improve hardening capacity and hardenability, and this class steel can obtain by different thermal treatment needed performance.At present the wear resistant alloy that gets up of development can be divided into Cr-Mo system, Cr-Mo-Si-Mn system, Cr-Mo-V system, Cr-Mo-W-V system, Cr-Ni-Mo system and Cr-Mn-Si-Ni system etc., all belongs to middle and high carbon low alloy steel and high quality steel series.Cr-Mo is that steel and Cr-Mo-Si-Mn are multiplex liner plate, grillflooring, abrading-ball and the excavator bucket teeth etc. in making ball mill of steel, Cr-Mo-V is that steel and Cr-Mo-W-V are the wearing piece that steel is mainly used in working under the high temperature abrasive wear, feeds used flitch, disintegrating apparatus jaw and the bar thereof etc. of coal device and cement mill such as the spiral in power plant delivers coal equipment.Cr-Ni-Mo is that steel is multiplex in making the teeth such as excavator, shovel loader, power shovel etc., the teeth of the scraper bowl of producing such as U.S. in recent years, and having more than 90% is that tempered martensite with Cr-Ni-Mo steel or Cr-Mo steel makes.Middle and high alloy abrasion resistant steel is used for having the abrasive wear of corrosive medium or fluid scouring operating mode mostly.Alloy abrasion resistant steel has higher hardness and wear resistance, good toughness, breaking resistance and to heat treated susceptibility, it is rising wear-resistant material in the at present opposing, under the low shock stress, but because its alloy content is higher, add more noble element, cost is very high, has to a certain degree limited its use.
White cast iron: white cast iron is one of the most excellent contemporary high-abrasive material.It is generally acknowledged white cast iron development experience the three generations, the first-generation is ordinary white cast iron, the s-generation is nickel hard white iron, the third generation is high-chromium white cast iron.White cast iron is mainly used in bearing low-stress scratch wearing and tearing, and heavily stressed grinding wearing and tearing and the less cutter of some impact load are cut and the erosive wear part, and application is restricted.
Since the bainite, domestic and international many scholars have carried out a large amount of research to pattern, phase conversion mechanism and the mechanical property of bainite in Bain discovery steel.The pattern of Typical Bainite and mechanical behavior thereof have been well-known in the steel, think that bainite structure is the unstratified molectron of ferrite and cementite.Compare with the mechanical property of Q-tempering martensitic stucture, generally believe that bainite structure has following characteristics: the typical upper bainite that (1) distribution of carbides forms between the bainite ferrite sheet, its over-all properties, especially poor toughness should be avoided occurring in the Heat Treatment Of Steel tissue.(2) the typical lower bainite that in the bainite ferrite sheet, consists of of distribution of carbides, in medium and high carbon steel, its toughness is better than tempered martensite, because contain twin crystal martensite in the medium high carbon martensite, during tempering, preferential carbide precipitate on twin, be conducive to the propagation of micro-flaw, crackle is expanded along twin boundary, and the Carbides In Lower Bainite distribution is more even, ferrite lamellae is conducive to the stress relaxation of crack tip, thereby hinders crack propagation.(3) mechanical property of not all typical lower bainite all has superiority.Many studies show that.In soft steel, under the identical yield strength condition, the martensitic toughness of low-carbon (LC) tempering lath is better than lower bainite.Huang.Thomas thinks, the lath of low-carbon (LC) lower bainite is thicker than the lath in the martensite, and lath is arranged bunchy with Small angle each other, therefore cleavage crack easily passes another lath from a lath.In addition, because low-carbon (LC) Carbides In Lower Bainite size is larger, and separates out along face, easily cause piling up of dislocations, form larger stress concentration, the crack nucleation chance is more.Therefore, the martensitic toughness of low-carbon (LC) tempering lath is better than the low-carbon (LC) lower bainite.
Bainitic steel refers at the steel grade that uses state undertissue as bainite, and this tissue obtains by air cooling.Mostly general bainitic steel is low-carbon (LC) at first, since its high hardening capacity, excellent processing performance, particularly quenching strain is little, and welding property is good, also thermal treatment and thermoforming two procedures can be combined, greatly shortened technical process, so that bainitic steel is comparatively fast developed.
Prior art research situation, domestic patent CN101117686A discloses a kind of horse shellfish wear resisting steel, the per-cent of its composition and weight is as follows: C:0.25~0.55, Si:0.3~1.2, Mn:1.5~3.0, Cr:0.8~2.5, Mo:1.5~3.0, Ni:0.3~1.0, P, S≤0.06, all the other are Fe and inevitable impurity.So that the foundry goods that its material is poured into a mould just can access preferably bainite structure of the higher martensitic stucture of hardness and over-all properties under the as cast condition air cooling, but this material is not suitable for using under HI high impact heavy lift operating mode.
Domestic patent CN101186960A discloses a kind of production method that Steckel mill produces wear resisting steel and steel plate of manufacturing thereof of using, and selects percentage composition to be: C≤0.30, Mn≤2.5, P≤0.015, S≤0.005, Si≤2.2, add the continuously cast bloom of an amount of alloys such as Cr, Mo, Nb and V; Adopt temperature dress temperature to send; Intermediate gauge steel plate flat-rolled on Steckel mill adopts TMCP+ off-line tempering process; Thin specification steel plate adopt rolling+control cold+the off-line tempering process; By the control dynamic recrystallization of rough rolling step and inferior dynamic recrystallization, control finish rolling stage Strain Accumulation and relaxation process, control rate of cooling in producing the lower bainite scope, the control final cooling temperature between lower bainite formation temperature and martensite formation temperature, employing off-line low-temperaturetempering≤350 ℃, realize tissue evenly, refinement and reinforcement, make steel plate have high strength, high tenacity, wear-resisting over-all properties.Yet, the complex process of this production method and wayward, production cost is high.
Summary of the invention
The object of the present invention is to provide a kind of cost lower, technique is easy to control, has the preparation method of the low-alloy high abrasion cast steel of good toughness and Hardness Match.
In order to reach above purpose, the present invention takes following technical scheme to be achieved:
A kind of low-alloy high abrasion cast steel comprises following component:
C:0.25-0.35?wt.%;
Si:0.9-1.6?wt.%;
Mn:0.3-1.8?wt.%;
Cr:0.7-1.0?wt.%;
Mo:0.15-0.3?wt.%;
Ti:0.05-0.35?wt.%;
Nb:0.01-0.05?wt.%;
V:0.05-0.25?wt.%;
RE:0.01-0.1?wt.%;
P、S≤0.03?wt.%
All the other are Fe and inevitable impurity;
A kind of preparation method of low-alloy high abrasion cast steel is characterized in that, may further comprise the steps:
1) adopts steel scrap, ferrosilicon, ferromanganese, ferrosilicon, molybdenum-iron, ferrochrome, ferrotianium, vanadium iron, ferro-niobium, rare earth silicon as the melting starting material, prepare burden by following component: C:0.25-0.35 wt.%;
Si:0.9-1.6?wt.%;
Mn:0.3-1.8?wt.%;
Cr:0.7-1.0?wt.%;
Mo:0.15-0.3?wt.%;
Ti:0.05-0.35?wt.%;
Nb:0.01-0.05?wt.%;
V:0.05-0.25?wt.%;
RE:0.01-0.1?wt.%;
P、S≤0.03?wt.%
All the other are Fe and inevitable impurity;
2) adopt the medium-frequency induction furnace melting, at first with ordinary scrap steel, the fusing of ferrochrome Hybrid Heating, carry out on-the-spot sample analysis;
3) successively ferromanganese, ferrosilicon, molybdenum-iron adding are waited for that all the molten clear rear ferrochrome that adds is further molten clear again, used the aluminium wire deoxidation treatment, again molten steel is poured the casting ladle of placing simultaneously ferrotianium, vanadium iron, ferro-niobium, rare earth silicon;
4) tapping temperature is controlled at 1500~1560 ℃, then is poured into the casting mould internal shaping, and shake out taking-up foundry goods carries out the sand removal processing after the cooling;
5) adopt the resistive heating heat treatment furnace, the foundry goods after processing is put into wherein heated up, the speed of intensification≤280 ℃/hour, insulation when temperature arrives 1050~1070 ℃, insulation 100-130min;
6) again foundry goods is put into 240~245 ℃ of salt bath furnaces after insulation is finished and be incubated, insulation 60-90min, the air cooling of coming out of the stove at last can obtain low-alloy high abrasion cast steel.
The present invention has adopted the component of selecting, and experiment parameter has also been carried out further preferred, the mechanical property that Fig. 1 is test materials after various austenitizing, 245 ℃ of tempering.Can find out, along with the rising of austenitizing temperature, the hardness value of material reduces gradually, and impact toughness improves gradually, and tensile strength is fallen after rising, and tensile strength has maximum value in the time of 1050~1070 ℃.It is analyzed, this is because after the processing of different normalizing process, the material mechanical performance causes of change is because along with the raising of austenitizing temperature and the prolongation of soaking time, cast structure's segregation degree of test materials reduces, the microstructure homogenization degree improves, this is conducive to improve the comprehensive mechanical property of steel, but, when too high the and soaking time of austenitizing temperature was long, platform gold element garden solubility increased, and had improved the content of matrix interalloy element, stabilization of austenite is improved, remained austenite content after the cooling in the tissue increases, and causes tensile strength and hardness to descend, and impact toughness increases.After 1050~1070 ℃ of normalizing treatment, material has preferably combination of strength and toughness, therefore can think that the best austenitizing temperature of this material is 1050~1070 ℃.Similarly, Fig. 2 be test materials behind 1060 ℃ of normalizing 110min, the mechanical property after the different tempering temperatures.Can find out, with the raising of tempering temperature, hardness reduces gradually; Tempering tensile strength below 400 ℃ changes little, the tempering above 400 ℃, and tensile strength reduces rapidly; After 240 ℃~245 ℃ tempering, impact toughness has maximum value, reaches Schwellenwert about 450 ℃~550 ℃, temper brittleness occurs, surpasses 650 ℃ of raising tempering impact toughnesses with tempering temperature and significantly raises.It is analyzed, and this decomposition with the quantitative change of bainite ferrite carbon and residual austenite is relevant, is the result of these two combined factors effects.Bainite ferrite is the supersaturated solid solution of carbon, and drawing process is accompanied by the reduction of bainite cable body solid solution carbon amount, causes the decline of hardness and tensile strength, and therefore, the general trend that hardness and tensile strength change is to descend along with the rising of tempering temperature.The decomposition of residual austenite is a complicated process, raise with tempering temperature, the thermostability of residual austenite (complexity that different tempering temperatures are decomposed) is different different because of tempering temperature, tempering below 300 ℃, stability of retained austenite in the New Type Bainite tissue improves, and low-temperaturetempering can improve the toughness of steel; In addition, steel is when low-temperaturetempering, and the elimination of unrelieved stress also is conducive to improve the impact toughness of steel.When tempering temperature surpasses 350 ℃, the residual austenite in the New Type Bainite is decomposed gradually, separates out the fragility cementite, causes the impact toughness value of steel to reduce.After tempering temperature was higher than 550 ℃, cementite began to assemble and nodularization, and ferrite has the trend of Recovery and recrystallization, the toughness bottom out of steel.Comprehensive, austenitizing temperature is incubated 100~130 minutes in 1050~1070 ℃ of scopes, and 240~245 ℃ of insulations 60-90 minute, test materials had preferably combination of strength and toughness again.
Beneficial effect of the present invention is, the material mechanical performance aspect that records at last, tensile strength δ b〉=1600MPa, hardness HRC 〉=48, impact toughness A Ku〉=26.5 J, so this material has good combination of strength and toughness.And it is simple to have a composition, simplifies technique, casting and thermal treatment process is more simple and easy to control, reduce the advantage of cost.
Description of drawings
Fig. 1 is that various austenitizing is on the experimental result diagram of the impact of mechanical property;
Fig. 2 is that different tempering temperatures are on the experimental result diagram of the impact of mechanical property.
Embodiment
Following examples describe the present invention in detail.Various raw material used in the present invention and items of equipment are conventional commercially available prod, all can buy directly by market to obtain.
Embodiment 1
1) adopts steel scrap, ferrosilicon, ferromanganese, ferrosilicon, molybdenum-iron, ferrochrome, ferrotianium, vanadium iron, ferro-niobium, rare earth silicon as the melting starting material, prepare burden by following component: C:0.25 wt.%;
Si:0.9?wt.%;
Mn:0.3?wt.%;
Cr:0.7?wt.%;
Mo:0.15?wt.%;
Ti:0.05?wt.%;
Nb:0.01?wt.%;
V:0.05?wt.%;
RE:0.01?wt.%;
P、S≤0.01?wt.%
All the other are Fe and inevitable impurity;
2) adopt the medium-frequency induction furnace melting, at first with ordinary scrap steel, the fusing of ferrochrome Hybrid Heating, carry out on-the-spot sample analysis;
3) successively ferromanganese, ferrosilicon, molybdenum-iron adding are waited for that all the molten clear rear ferrochrome that adds is further molten clear again, used the aluminium wire deoxidation treatment, again molten steel is poured the casting ladle of placing simultaneously ferrotianium, vanadium iron, ferro-niobium, rare earth silicon;
4) tapping temperature is controlled at about 1500 ℃, then is poured into the casting mould internal shaping, and shake out taking-up foundry goods carries out the sand removal processing after the cooling;
5) adopt the resistive heating heat treatment furnace, the foundry goods after processing is put into wherein heated up, 230 ℃/hour of the speed of intensification, insulation when temperature arrives 1050 ℃, insulation 100min;
6) salt bath furnace of again foundry goods being put into about 240 ℃ after insulation is finished is incubated, insulation 60min, and the air cooling of coming out of the stove at last can obtain low-alloy high abrasion cast steel.
Tension specimen carries out line cutting and mechanical workout, and obtaining diameter is the short tension specimen of standard of 8rnm, and the impact toughness test specimen size is the standard u notch sample of 55mm * 10mm * 10mm.Carry out the tensile property test with CMT5105A type universal testing machine; With the impact toughness of JB-30/15 type shock-testing machine test material, with the hardness of HRl50 type Rockwell hardometer test material, the material mechanical performance that records at last is respectively: tensile strength δ b1637MPa, hardness HRC 48.1, impact toughness A Ku27.2 J.
Embodiment 2
1) adopts steel scrap, ferrosilicon, ferromanganese, ferrosilicon, molybdenum-iron, ferrochrome, ferrotianium, vanadium iron, ferro-niobium, rare earth silicon as the melting starting material, prepare burden by following component: C:0.3 wt.%;
Si:1.2?wt.%;
Mn:1.0?wt.%;
Cr:0.85?wt.%;
Mo:0.2?wt.%;
Ti:0.25?wt.%;
Nb:0.03?wt.%;
V:0.15?wt.%;
RE:0.06?wt.%;
P、S≤0.02?wt.%
All the other are Fe and inevitable impurity;
2) adopt the medium-frequency induction furnace melting, at first with ordinary scrap steel, the fusing of ferrochrome Hybrid Heating, carry out on-the-spot sample analysis;
3) successively ferromanganese, ferrosilicon, molybdenum-iron adding are waited for that all the molten clear rear ferrochrome that adds is further molten clear again, used the aluminium wire deoxidation treatment, again molten steel is poured the casting ladle of placing simultaneously ferrotianium, vanadium iron, ferro-niobium, rare earth silicon;
4) tapping temperature is controlled at about 1520 ℃, then is poured into the casting mould internal shaping, and shake out taking-up foundry goods carries out the sand removal processing after the cooling;
5) adopt the resistive heating heat treatment furnace, the foundry goods after processing is put into wherein heated up, the speed of intensification is 250 ℃/hour, insulation when temperature arrives 1060 ℃, insulation 120min;
6) salt bath furnace of again foundry goods being put into about 245 ℃ after insulation is finished is incubated, insulation 70min, and the air cooling of coming out of the stove at last can obtain low-alloy high abrasion cast steel.
Tension specimen carries out line cutting and mechanical workout, and obtaining diameter is the short tension specimen of standard of 8rnm, and the impact toughness test specimen size is the standard u notch sample of 55mm * 10mm * 10mm.Carry out the tensile property test with CMT5105A type universal testing machine; With the impact toughness of JB-30/15 type shock-testing machine test material, with the hardness of HRl50 type Rockwell hardometer test material, the material mechanical performance that records at last is respectively: tensile strength δ b1673MPa, hardness HRC 48.9, impact toughness A Ku27.9 J.
Embodiment 3
1) adopts steel scrap, ferrosilicon, ferromanganese, ferrosilicon, molybdenum-iron, ferrochrome, ferrotianium, vanadium iron, ferro-niobium, rare earth silicon as the melting starting material, prepare burden by following component: C:0.35 wt.%;
Si:1.6?wt.%;
Mn:1.8?wt.%;
Cr:1.0?wt.%;
Mo:0.3?wt.%;
Ti:0.35?wt.%;
Nb:0.05?wt.%;
V:0.25?wt.%;
RE:0.1?wt.%;
P、S≤0.03?wt.%
All the other are Fe and inevitable impurity;
2) adopt the medium-frequency induction furnace melting, at first with ordinary scrap steel, the fusing of ferrochrome Hybrid Heating, carry out on-the-spot sample analysis;
3) successively ferromanganese, ferrosilicon, molybdenum-iron adding are waited for that all the molten clear rear ferrochrome that adds is further molten clear again, used the aluminium wire deoxidation treatment, again molten steel is poured the casting ladle of placing simultaneously ferrotianium, vanadium iron, ferro-niobium, rare earth silicon;
4) tapping temperature is controlled at about 1560 ℃, then is poured into the casting mould internal shaping, and shake out taking-up foundry goods carries out the sand removal processing after the cooling;
5) adopt the resistive heating heat treatment furnace, the foundry goods after processing is put into wherein heated up, 275 ℃/hour of the speed of intensification, insulation when temperature arrives 1070 ℃, insulation 130min;
6) salt bath furnace of again foundry goods being put into about 245 ℃ after insulation is finished is incubated, insulation 90min, and the air cooling of coming out of the stove at last can obtain low-alloy high abrasion cast steel.
Tension specimen carries out line cutting and mechanical workout, and obtaining diameter is the short tension specimen of standard of 8rnm, and the impact toughness test specimen size is the standard u notch sample of 55mm * 10mm * 10mm.Carry out the tensile property test with CMT5105A type universal testing machine; With the impact toughness of JB-30/15 type shock-testing machine test material, with the hardness of HRl50 type Rockwell hardometer test material, the material mechanical performance that records at last is respectively: tensile strength δ b1669MPa, hardness HRC 49.1, impact toughness A Ku27.1 J.
Foregoing description only proposes as the enforceable technical scheme of the present invention, not as the Single restriction condition to its technical scheme itself.

Claims (1)

1. the preparation method of a low-alloy high abrasion cast steel is characterized in that: make by following steps:
1) adopt steel scrap, ferrosilicon, ferromanganese, ferrosilicon, molybdenum-iron, ferrochrome, ferrotianium, vanadium iron, ferro-niobium, rare earth silicon as the melting starting material, prepare burden by following component:
C:0.25-0.35?wt.%;
Si:0.9-1.6?wt.%;
Mn:0.3-1.8?wt.%;
Cr:0.7-1.0?wt.%;
Mo:0.15-0.3?wt.%;
Ti:0.05-0.35?wt.%;
Nb:0.01-0.05?wt.%;
V:0.05-0.25?wt.%;
RE:0.01-0.1?wt.%;
P、S≤0.03?wt.%
All the other are Fe and inevitable impurity;
2) adopt the medium-frequency induction furnace melting, at first with ordinary scrap steel, the fusing of ferrochrome Hybrid Heating, carry out on-the-spot sample analysis;
3) successively ferromanganese, ferrosilicon, molybdenum-iron adding are waited for that all the molten clear rear ferrochrome that adds is further molten clear again, used the aluminium wire deoxidation treatment, again molten steel is poured the casting ladle of placing simultaneously ferrotianium, vanadium iron, ferro-niobium, rare earth silicon;
4) tapping temperature is controlled at 1500~1560 ℃, then is poured into the casting mould internal shaping, and shake out taking-up foundry goods carries out the sand removal processing after the cooling;
5) adopt the resistive heating heat treatment furnace, the foundry goods after processing is put into wherein heated up, the speed of intensification≤280 ℃/hour, insulation when temperature arrives 1050~1070 ℃, insulation 100-130min;
6) again foundry goods is put into 240~245 ℃ of salt bath furnaces after insulation is finished and be incubated, insulation 60-90min, the air cooling of coming out of the stove at last.
CN2013100406044A 2013-02-03 2013-02-03 Preparation method of low-alloy high-wear-resistance cast steel Pending CN103060704A (en)

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CN103667896A (en) * 2013-11-07 2014-03-26 安徽省智汇电气技术有限公司 Tensile wear-resisting alloy steel material for pump valve and preparation method thereof
CN106337154A (en) * 2016-12-02 2017-01-18 山东理工大学 Medium carbon-rare earth alloy strengthening cast steel shot/grit and preparation technology thereof
CN109457086A (en) * 2018-12-29 2019-03-12 上海大学 Nb-microalloying abrasion-resistant cast steel material, its application and preparation method
CN109706399A (en) * 2019-03-01 2019-05-03 攀钢集团攀枝花钢铁研究院有限公司 High titanium abrasion-resistant stee and preparation method thereof

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Application publication date: 20130424