CN105088055A - Wear-resisting hammer head for hammer type breaking machine and production method of wear-resisting hammer head - Google Patents
Wear-resisting hammer head for hammer type breaking machine and production method of wear-resisting hammer head Download PDFInfo
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Abstract
The invention provides a wear-resisting hammer head for a hammer type breaking machine. The wear-resisting hammer head comprises a high-manganese-steel lifting lug and a high-chrome iron hammer head body. The production method comprises smelting, modification treatment, casting and heat treatment. The hammer head produced through the method has the higher hardness and wear resistance, and wear of the hammer head in the using process is reduced; toughness of the hammer head can be obviously improved, and good bonding of hardness and the toughness is ensured; and the phenomenon that due to higher brittleness, the hammer head is broken in the using process is avoided.
Description
Technical field
The invention belongs to crusher and production method technical field thereof, be specifically related to a kind of hammer mill wear-resistant hammer head and production method thereof.
Background technology
Hammer mill is one of common equipment in crushing production line and sand production line processed, is widely used in the fragmentation of the hard mineral in other such as iron ore, sandstone, gypsum, blast furnace slag, coal gangue, lump coal.The raw material system of ironmaking of new cause branch office of Nanjing Meishan Metallurgy Co., Ltd. uses reversible reaction type hammer mill to bear the broken task of broken raw materials for sintering Wingdale at present online, and tup is one of kernel component of hammer mill, be arranged on the bearing pin of crusher rotor, tup directly hits material when crusher runs up, therefore, tup is constantly subject to the comprehensive action such as impact, extruding of high rigidity material.Along with company's production capacity increases fast, require that crusher is round-the-clock to operate at full capacity, make tup quick abrasion, yielding, the life-span is short, crushing efficiency is low, general work-ing life was no longer than 2 months, namely what have even only scrapped with 1 month, cannot meet feed requirement, seriously constrained the steady running of production line.
Make a general survey of domestic and international hammer head material, the kind of the hammer head material used at present mainly contains high mangaenese steel, low, Medium Alloy Steel, rich chromium cast iron etc.Wherein, high mangaenese steel manufactures grinder hammerhead comparatively early and very general a kind of material, be suitable as and manufacture heavy hammer and working stress is higher or the high-abrasive material of the operating mode of large impact load, but when the material such as Wingdale, rhombspar that intensity is lower, because the work hardening produced in use is very little, tup wearing and tearing are very serious, and result of use is very undesirable.Low, interalloy wear resisting steel has higher hardness, preferably impacts Firmware and high wear resistance, adds suitable thermal treatment process, can obtain hardness and toughness mates good high-abrasive material.But because its hardness is generally lower than 55HRC, also only containing less high rigidity carbide in tissue, main wear-resistant by martensitic matrix, so the wear resistance of this tup or not ideal enough.Rich chromium cast iron is higher due to Cr content, contains Cr carbide in its tissue containing more, makes rich chromium cast iron have excellent wear resistance, thus becomes one of present most popular tup manufactured materials.The tup of the hammer mill made of high-chromium white cast iron, its life-span is higher than high mangaenese steel 4 ~ 5 times.But because the hardness of rich chromium cast iron is higher, containing more carbide in tissue, thus its fragility is comparatively large, and when stress is larger, tup easily ruptures.Therefore, the good combination of the wear resistance and toughness that how to realize hammer for hammer crusher just has great importance.
Chinese Patent Application No.: 201410334611.X, the applying date: on 07 14th, 2014, invention and created name: a kind of Large Crusher tup, this application case discloses a kind of Large Crusher tup, comprise the chemical composition of following weight percent: C:2.2-3.2%, Cr:18-22%, Si:0.3-0.9%, Mn:1.0-2.0%, Ni:0.3-1.0%, V≤0.3%, Nb≤0.2%, W:0.1-0.5%, S≤0.025%, P≤0.025%, Zr:0.05-0.2%, surplus is iron.The present invention fills a prescription rationally, make simple, the intensity of tup, toughness, wear resistance and anti-impact force can be improved to a certain extent, be applicable to Large Crusher, decrease the frequency that factory changes tup to a certain extent, reduce labour intensity, but during for long iron and steel enterprise's operation, its intensity, toughness, wear resistance and anti-impact force etc. can not reach again required degree, cause wearing and tearing very fast, still need periodic replacement.And for example: Chinese Patent Application No.: 201310208344.7, the applying date: on 05 30th, 2013, invention and created name: a kind of wear-resisting grinder hammerhead, this application case discloses a kind of wear-resisting grinder hammerhead, material is alloy HRC, wherein the composition of alloy HRC is: C:2.1-3.2%, S:0.3-1.0%, Mn:2.0-3.3%, Cr:14-18%, Mo:0.3-0.5%, W:0.2-0.7%, V:0.2-1.2%, Ti, Nb < 0.1%; This application case to some extent solves hammer head of hammer crusher quick abrasion, the problem that work-ing life is short.But because above-mentioned application case all adopts integral cast form, on the basis ensureing tup wear resistance, the raising of its toughness receives and greatly limits, thus makes tup in use easily rupture.
Mei Gangxian tup comprises 1# and 2# two kinds, and its chemical composition and carbon equivalent and carbide volume fraction are respectively as shown in table 1 Yu table 2:
Table 1: the Mei Gangxian chemical component table of 1#, 2# tup:
Table 2: the Mei Gangxian carbon equivalent of 1#, 2# tup and carbide volume fraction table:
And the metallographic structure of the metallographic structure of 1# tup, 2# tup, 1#2# tup surface rockwell hardness test result and 1#2# tup impelling strength test result are respectively as shown in Figure 1,2,3, 4; According to table 1, table 2 and Fig. 1,2,3,4:
The carbon equivalent of 1# tup belongs to hypereutectic composition, and 1# tup belongs to hypereutectic alloy high-chromium white cast iron.Therefore, cast alloy, at process of setting first carbide precipitate, reduces just eutectoid carbide with temperature and constantly grows up, when arriving eutectic temperature, eutectic reaction occurs, the carbide in tissue generates austenite and eutectic carbides, so can be divided into just eutectoid carbide and eutectic carbides.First eutectoid carbide owing to directly separating out from cast iron liquid, therefore will constantly grow up in process of cooling, thus the form of the main lath-shaped thick with white or hexagon bulk occurs, also there is austenitic transformation product or shrink the hole produced in some hexagonal inner, as shown in Figure 1.When high-chromium white cast iron Cr content higher than 12%, Cr/C value more than 3.5 time, carbide is M mainly
7c
3and M
23c
6type carbide.Due to Cr content in 1# tup nearly 28%, therefore, first eutectoid carbide is mainly M
7c
3eutectic carbides.Also there is a small amount of eutectic carbides in 1# tup, eutectic carbides is the distribution of chrysanthemum shape, some eutectic carbides be chrysanthemum shape or spot distribution around first eutectoid carbide, eutectic carbides is also mainly M
7c
3eutectic carbides.
The carbon equivalent of 2# tup belongs to hypoeutectic composition, and 2# tup belongs to hypoeutectic alloy high-chromium white cast iron.Therefore first separate out pro-eutectic austenite tissue time cast iron solidified, along with the reduction of temperature, just analyse austenite dendrites and constantly grow up, when temperature arrives eutectic transformation temperature, eutectic transformation occurs, form austenite and eutectic carbides (ledeburite organization).Because alloying element is higher, hardening capacity is high, is organized as austenitic transformation product martensite and eutectic carbides after normalizing low-temperature tempering heat treatment, eutectic carbides is distributed in the interface of martensitic stucture, as shown in Figure 2, eutectic carbides is distributed between dendrite, and carbide is mainly M
7c
3eutectic carbides, the eutectic carbides pattern of white is that lath-shaped or interrupted strip and block are distributed between dendrite.As can be seen from Fig., martensitic stucture also has Second Phase Precipitation (stain), this precipitated phase is mainly the cementite phase that normalizing process of cooling or drawing process are separated out, mainly with granular or spot distribution on martensitic matrix.
Adopt HR-150A Rockwell hardometer to carry out hardness performance test to 1#, 2# tup sample, penetrator is 120 ° of diamond circular cones, and load is 150Kg.During test, sample is steadily placed on Stage microscope, pressure head pressurize 30s.For ensureing the accuracy of data, first remove surface scale, then polished by specimen surface, the surface middle part of each sample is all chosen in test, and has certain distance each other.After the hardness value of 3 points to be determined, and other data are averaged as the Rockwell hardness number of each sample.The hardness result of each sample as shown in Figure 3.As seen from the figure, the hardness of 1#, 2# tup is respectively 59.1HRC, 61.4HRC, and its mean value is 60.3HRC; Compare 1# tup, the hardness value of 2# tup each point is larger.The hardness of 2# tup a little more than 1# tup, mainly because M
7c
3the hardness (HV1200-HV1800) of carbide is a little more than M
23c
6, and 1# tup is relatively higher due to C content, defines more M in its matrix (HV1000-HV1100)
23c
6carbide, causes M in its matrix
7c
3carbide content is lower than 2# tup.
Total ballistic work is adopted to be the impact load ability that the JB-5 type Charpy toughness test instrument of 250J measures 1#, 2# tup, specimen size is 10 × 10 × 60mm, impact specimen is before the experiments through strict surface treatment, polishing specimen surface cut, in case the test of surface imperfection to performance impacts.Each sample carries out 3 tests, and be the notched bar impact strength of this sample with 3 test result mean values, detected result as shown in Figure 4.As seen from the figure, the impelling strength of 1#, 2# tup is very low, is respectively 2.0J/cm
2, 2.8J/cm
2; The impelling strength difference of 1#, 2# tup each point is larger; Compare 1# tup, the impelling strength of 2# tup is larger.The major cause that the impelling strength mean value of 1# tup is starkly lower than 2# tup is probably different relevant from carbide content in 1#, 2# tup microstructure and matrix thereof, when chromium content is more than 22%, carbide increasing number in rich chromium cast iron iron, primary carbide is thick, carbide increases the degree of isolating of matrix, and the impelling strength of material is deteriorated.Because the impelling strength difference of 1#, 2# tup each point is larger, material uneven microstructure is described, therefore this set hammer head very easily forms the wearing and tearing of localized delamination formula at work, simultaneously material toughness is inadequate, and pears can be caused again to cut formula wearing and tearing, and namely this is short major cause in Mei Gangxian 1#, 2# tup work-ing life, its work-ing life was no longer than 2 months, namely what have even only scrapped with 1 month, cannot meet feed requirement, seriously constrained the steady running of production line.
Therefore, develop one and be applicable to this enterprise, on the basis ensureing tup wear resistance, the hammer head of hammer crusher effectively preventing brittle failure is those skilled in the art institute urgent need to solve the problem.
Summary of the invention
For solving the problem, the invention discloses a kind of hammer mill wear-resistant hammer head and production method thereof.
In order to achieve the above object, the invention provides following technical scheme:
A kind of hammer mill wear-resistant hammer head, comprises high mangaenese steel hanger and rich chromium cast iron tup body; Shared by the moiety of rich chromium cast iron tup body and each composition, mass percent is respectively: C:2.46 ~ 2.74%, Cr:18.45 ~ 19.14%, Si:0.36 ~ 0.98%, Mn:0.48 ~ 0.74%, Mo:1.08 ~ 1.13%, Cu:0.49 ~ 0.64%, Ni:0.75 ~ 0.82%, V:0-0.3%, rotten component: 0-0.2%, all the other are Fe.
Its concrete production method is:
(1) melting:
Raw material is put into 250Kg medium-frequency induction furnace and carry out melting, and smelting temperature is controlled at 1450-1480 DEG C, and ensureing that in the molten iron after melting, each element and shared mass percent are respectively: C:2.46 ~ 2.74%, Cr:18.45 ~ 19.14%, Si:0.36 ~ 0.98%, Mn:0.48 ~ 0.74%, Mo:1.08 ~ 1.13%, Cu:0.49 ~ 0.64%, Ni:0.75 ~ 0.82%, V:0-0.3%, all the other are Fe;
(2) Metamorphism treatment:
Molten iron in step (1) is carried out high temperature tap a blast furnace, tapping temperature controls at 1480-1520 DEG C, and the rotten component of interpolation carries out Metamorphism treatment when tapping a blast furnace, and the per-cent that guarantee molten iron mesometamorphism component accounts for molten iron total mass is 0-0.2%;
(3) pour into a mould:
Pour into a mould high mangaenese steel hanger in advance, and remove the surface irregularities at compound position; Add high mangaenese steel hanger time moulded, at the temperature of 1380-1420 DEG C, pour into a mould in step (2) through the molten iron of Metamorphism treatment, form tup foundry goods;
(4) thermal treatment:
The tup foundry goods obtained in step (3) being naturally cooled to 200 DEG C to be placed in heat treatment furnace with stove heating, carries out normalizing treatment; Be heated to 950-1050 DEG C with stove subsequently, and be incubated 2-4h; Water-cooling pattern is adopted to carry out quench treatment afterwards; And when tup foundry goods is cooled to room temperature, is placed in heat treatment furnace and carries out temper, finally take out and be placed in air naturally cooling.
As preferably, rotten component comprises the combination of any one composition or any several composition in Ti, Nb, Ce and La.
As preferably, the raw material in step (1) comprises high carbon ferro-chrome, molybdenum-iron FeMo60, nickel plate, the pig iron and steel scrap; And need to carry out adding aluminium deep deoxidation in fusion process and carry out degasification and go to be mingled with process.
As preferably, in step (4), the temperature of normalizing treatment is 650 DEG C, and duration is 2-4h; The temperature of temper is 250-400 DEG C, and duration is 2-3h.
The invention provides a kind of hammer mill wear-resistant hammer head be made up of high mangaenese steel hanger and rich chromium cast iron tup body, production method comprises melting, Metamorphism treatment, cast and thermal treatment.Use high carbon ferro-chrome, molybdenum-iron FeMo60, nickel plate, the pig iron and steel scrap as tup body raw material in the present invention, tup body is had and has outstanding hardness, wear resistance and corrosion proof possibility, and use molybdenum-iron FeMo60 as amorphous metal additive, tup body is made to have uniform fine grained texture, improve the hardening capacity of tup body, be conducive to eliminating temper brittleness, and strengthen its intensity and wear resistance.
The present invention is after carrying out melting to raw material, also add the rotten component combined by the combination of any one composition in Ti, Nb, Ce and La or any several composition, when adding in molten iron, can directly increase forming core core, obtain tiny casting crystal grain, improve the performance of the tup body poured into a mould by molten iron.Add Ti as alterant, erosion resistance and the intensity of tup body can be strengthened; Add Nb as alterant, can strengthen the high temperature resistant of tup body and intensity, and tup body can be made to become tough and tensile, Nb also has special air drawing characteristics simultaneously, as degasifier, is beneficial in fusion process and carries out degas operation; Add Ce as alterant, mainly Ce is added in molten iron as reductive agent; Add La as alterant, make tup body have certain ductility, improve the toughness of tup body.
The present invention, when carrying out melting to raw material, also needs to add aluminium deep deoxidation and carries out degasification and go to be mingled with process, accurately can control each component content in molten iron, and can put forward heavy alloyed recovery rate; And the present invention finally also carries out accurate normalizing and temper to foundry goods, can remove the internal stress of tup foundry goods, improve its toughness and flexibility.
The present invention compared with prior art, by the material component of adjustment tup body and the content of each component, ensure that tup has higher hardness and wear resistance on the one hand, reduce tup wearing and tearing in use, the toughness of tup is made again to be improved significantly on the other hand, ensure the good combination of Hardness and toughness, prevent tup from use because fragility is higher, phenomenon of rupture occurring.
Accompanying drawing explanation
The metallographic structure figure of Fig. 1,1# tup;
The metallographic structure of Fig. 2,2# tup;
Fig. 3,1#2# tup surface rockwell hardness test result figure;
Fig. 4,1#2# tup impelling strength test result figure;
The metallographic structure figure of hammer mill wear-resistant hammer head in Fig. 5, embodiment 1;
Hammer mill wear-resistant hammer head surface rockwell hardness test result figure in Fig. 6, embodiment 1;
Hammer mill wear-resistant hammer head impelling strength test result figure in Fig. 7, embodiment 1;
Hammer mill wear-resistant hammer head surface rockwell hardness test result figure in Fig. 8, embodiment 2;
Hammer mill wear-resistant hammer head impelling strength test result figure in Fig. 9, embodiment 2.
Embodiment
Below with reference to specific embodiment, technical scheme provided by the invention is described in detail, following embodiment should be understood and be only not used in for illustration of the present invention and limit the scope of the invention.
Embodiment 1:
The invention provides a kind of hammer mill wear-resistant hammer head, comprise high mangaenese steel hanger and rich chromium cast iron tup body.
Concrete production method is:
(1) melting:
High carbon ferro-chrome, molybdenum-iron FeMo60, nickel plate, the pig iron and steel scrap are put into 250Kg medium-frequency induction furnace and carries out melting, and smelting temperature is controlled at 1450 DEG C; And add aluminium deep deoxidation and carry out degasification and go to be mingled with process
(2) Metamorphism treatment:
Molten iron in step (1) is carried out high temperature tap a blast furnace, tapping temperature controls at 1480 DEG C, and interpolation Ti, Nb, Ce and La carry out Metamorphism treatment when tapping a blast furnace, and the per-cent that guarantee molten iron mesometamorphism component accounts for molten iron total mass is 0-0.2%;
(3) pour into a mould:
Pour into a mould high mangaenese steel hanger in advance, and remove the surface irregularities at compound position; Add high mangaenese steel hanger time moulded, at the temperature of 1380-1420 DEG C, pour into a mould in step (2) through the molten iron of Metamorphism treatment, form tup foundry goods;
(4) thermal treatment:
The tup foundry goods obtained in step (3) being naturally cooled to 200 DEG C to be placed in heat treatment furnace with stove heating, carries out that temperature is 650 DEG C, duration is the normalizing treatment of 4h; Be heated to 950 DEG C with stove subsequently, and be incubated 2-4h; Water-cooling pattern is adopted to carry out quench treatment afterwards; And when tup foundry goods is cooled to room temperature, is placed in heat treatment furnace and carries out that temperature is 250 DEG C, duration is the temper of 2h, finally take out and be placed in air naturally cooling.
In the present embodiment, the chemical composition of tup body and carbon equivalent and carbide volume fraction are respectively as shown in table 3 Yu table 4:
Table 3: the chemical component table of tup body in embodiment 1:
Table 4: the carbon equivalent of tup body and carbide volume fraction table in embodiment 1:
| Model | C eq/％ | Type of cast | Carbide volume fraction/% |
| Before rotten | 3.77 | Hypoeutectic | 30.90 |
| After rotten | 3.50 | Hypoeutectic | 27.08 |
Compare Mei Gang 1#, 2# tup, in the present embodiment, tup with the addition of Cu, and Cr content obviously reduces, because the process of tapping a blast furnace has carried out Metamorphism treatment, also containing a small amount of Ti, Nb and Re in iron.
Be illustrated in figure 5 the metallographic structure figure of the hammer mill wear-resistant hammer head produced by the present invention, the microstructure of this tup is mainly martensite+carbide as can be seen from Figure, around crystal boundary, be dispersed with the carbide of white, in matrix, there is the oxide inclusion of a small amount of grey black.Carbon equivalent due to this tup belongs to hypoeutectic composition, and it belongs to Hypoeutectic high-chromium white cast iron.Therefore first separate out pro-eutectic austenite tissue time cast iron solidified, along with the reduction of temperature, just analyse austenite dendrites and constantly grow up, when temperature arrives eutectic transformation temperature, eutectic transformation occurs, form austenite and eutectic carbides (ledeburite organization).Because alloying element is higher, hardening capacity is high, is organized as austenitic transformation product martensite and eutectic carbides after normalizing low-temperature tempering heat treatment, and eutectic carbides is distributed in the interface of martensitic stucture, and eutectic carbides is mainly M
7c
3type carbide.It can also be seen that from Fig. 5 (c) martensitic stucture also has Second Phase Precipitation (stain), this precipitated phase is mainly the cementite phase that normalizing process of cooling or drawing process are separated out, mainly with granular or spot distribution on martensitic matrix.Compared with Mei Gangxian tup, in the present embodiment, the grain-size of tup is less, and white carbide in matrix is less, more disperse, there is not large block first eutectoid carbide, and the quantity be mingled with also obviously reduces.
Mechanical property sample is taken from through heat treated tup entity, with reference to standard GB/T/T230.1-2009, adopt the microhardness of carbide and matrix in HR-150A Rockwell Hardness meter test samples tissue, specimen size is 20 × 20 × 60mm, for ensureing the accuracy of data, detect 2 tups altogether, in the hardness value of the surface middle part of each tup mensuration separated by a distance 3 points, to average and as the Rockwell hardness number of this tup, its test result as shown in Figure 6.As seen from the figure, in the present embodiment, the Rockwell hardness of gained tup is respectively 65.1HRC, 61.2HRC, and its mean value is 63.2HRC, and on tup, the hardness value difference of each point is little, this result show the global tissue of tup and comparison of ingredients even.Compared with Mei Gangxian tup, in the present embodiment, the Rockwell hardness number of tup is significantly improved, its major cause be with the addition of 1.13% Mo, Mo both can replace chromium atom, formed (Fe, Cr, Mo)
7c
3type carbide, can be solid-solution among austenite and transmutation product thereof again, postpones austenitic perlitic transformation and effectively improves the hardening capacity of body material, can also directly and carbon chemical combination formed with Mo
2c is main carbide, due to Mo
2the hardness of C is higher than Cr
7c
3, thus further increase hardness and the wear resistance of tup.
The impact specimen of 10 × 10 × 60mm or 20 × 20 × 60mm is processed by Linear cut machine, adopt the notched bar impact strength of NI300C pendulum dynamic impact test machine test sample, for ensureing the accuracy of data, detect 2 tups altogether, each tup cuts respectively 3 samples to test, using 3 test result mean value as the notched bar impact strength of this tup, its result as shown in Figure 7.As seen from the figure, the impelling strength of tup that the present embodiment obtains is respectively 6.5J/cm
2, 5.6J/cm
2, its mean value is 6.1J/cm
2, be 3 times of Mei Gangxian tup.Its reason mainly, that in tup, Cr content reduces on the one hand, carbide quantity in matrix is caused to reduce and size reduction, reduce carbide and degree is isolated to matrix, thus improve the impelling strength of material, be on the other hand with the addition of in tup 1.13% Mo, Mo can alleviate or eliminate the temper brittleness because other alloying elements cause and greatly be conducive to the impelling strength of raising steel, therefore also can improve the impelling strength of material.
The tup of the present embodiment is arranged on region the most easy to wear test, the degree of wear is relatively low, abration position is even, and do not occur that any bulk peels off formula wearing and tearing, and tup profile rule is smooth, total appraisal is good, substantially reaches desired result; The work-ing life of tup is promoted to more than three months by original one and a half months, and crushing is promoted to 50,000 tons/cover by 2.5 ten thousand tons/cover.
Embodiment 2:
The chemical composition of adjustment tup body, as shown in table 5, and the quenching temperature in step (4) during thermal treatment is brought up to 1050 DEG C, tempering temperature brings up to 400 DEG C, and tempering time is increased to 3 hours.
Table 5: the chemical component table of tup body in embodiment 2:
| Composition | C | Cr | Si | Mn | Mo | Cu | Ni | V | Ti、Nb、Re |
| Before rotten | 2.74 | 19.14 | 0.98 | 0.74 | 1.08 | 0.64 | 0.82 | 0.13 | Trace |
| After rotten | 2.42 | 18.98 | 0.79 | 0.78 | 1.11 | 0.58 | 0.83 | 0.25 | Trace |
Table 6: the carbon equivalent of tup body and carbide volume fraction in embodiment 2:
| Model | C eq/％ | Type of cast | Carbide volume fraction/% |
| Before rotten | 3.77 | Hypoeutectic | 30.90 |
| After rotten | 3.68 | Hypoeutectic | 28.91 |
In the present embodiment, the carbon equivalent of tup still belongs to hypoeutectic composition, belongs to Hypoeutectic high-chromium white cast iron, and its microstructure is based on martensite+carbide.Adopt HR-150A Rockwell hardometer to carry out hardness performance test to tup in the present embodiment, testing method is identical with in embodiment 1, for ensureing the accuracy of data, detects 3 tups altogether.In the hardness value of the surface middle part of each tup mensuration separated by a distance 3 points, to average and as the Rockwell hardness number of this tup.The hardness result of 3 tups as shown in Figure 8.As seen from the figure, in the present embodiment, the Rockwell hardness of 3 tups is respectively 64.5HRC, 63.5HRC, 64.8HRC, its mean value is 64.3HRC, and its Rockwell hardness number has a small amount of raising relative in embodiment 1, its major cause is the Si in the tup of the present embodiment on the one hand, Mn content is higher, and Si, Mn can be solid-solubilized in carbide, the hardness of carbide can be impelled to improve further, the quenching temperature being the tup of the present embodiment is on the other hand higher, namely austenitizing temperature is higher, when austenitizing temperature raises, carbon content in matrix also raises, and can significantly improve hardening capacity and quenching after organize hardness.
The tup sample of NI300C pendulum dynamic impact test machine to the present embodiment is adopted to carry out impact property test, testing method is identical with embodiment 1, for ensureing the accuracy of data, detect 3 tups altogether, each tup cuts respectively 3 samples to test, using 3 test result mean value as the notched bar impact strength of this tup, its impelling strength result as shown in Figure 9.As seen from the figure, in the present embodiment, the impelling strength of 3 tups is respectively 6.0J/cm
2, 6.3J/cm
2, 5.9J/cm
2, its mean value is 6.1J/cm
2, suitable with the notched bar impact strength of tup in embodiment 1.
Finally it should be noted that, above embodiment is only in order to illustrate technical scheme of the present invention and non-limiting technical scheme, those of ordinary skill in the art is to be understood that, those are modified to technical scheme of the present invention or equivalent replacement, and do not depart from aim and the scope of the technical program, all should be encompassed in the middle of right of the present invention.
Claims (5)
1. a hammer mill wear-resistant hammer head, is characterized in that: comprise high mangaenese steel hanger and rich chromium cast iron tup body; Shared by the moiety of described rich chromium cast iron tup body and each composition, mass percent is respectively: C:2.46 ~ 2.74%, Cr:18.45 ~ 19.14%, Si:0.36 ~ 0.98%, Mn:0.48 ~ 0.74%, Mo:1.08 ~ 1.13%, Cu:0.49 ~ 0.64%, Ni:0.75 ~ 0.82%, V:0-0.3%, rotten component: 0-0.2%, all the other are Fe.
2. a kind of hammer mill wear-resistant hammer head according to claim 1, is characterized in that: its concrete production method is:
(1) melting:
Raw material is put into 250Kg medium-frequency induction furnace and carry out melting, and smelting temperature is controlled at 1450-1480 DEG C, and ensureing that in the molten iron after melting, each element and shared mass percent are respectively: C:2.46 ~ 2.74%, Cr:18.45 ~ 19.14%, Si:0.36 ~ 0.98%, Mn:0.48 ~ 0.74%, Mo:1.08 ~ 1.13%, Cu:0.49 ~ 0.64%, Ni:0.75 ~ 0.82%, V:0-0.3%, all the other are Fe;
(2) Metamorphism treatment:
Molten iron in step (1) is carried out high temperature tap a blast furnace, tapping temperature controls at 1480-1520 DEG C, and the rotten component of interpolation carries out Metamorphism treatment when tapping a blast furnace, and the per-cent that guarantee molten iron mesometamorphism component accounts for molten iron total mass is 0-0.2%;
(3) pour into a mould:
Pour into a mould high mangaenese steel hanger in advance, and remove the surface irregularities at compound position; Add high mangaenese steel hanger time moulded, at the temperature of 1380-1420 DEG C, pour into a mould in step (2) through the molten iron of Metamorphism treatment, form tup foundry goods;
(4) thermal treatment:
The tup foundry goods obtained in step (3) being naturally cooled to 200 DEG C to be placed in heat treatment furnace with stove heating, carries out normalizing treatment; Be heated to 950-1050 DEG C with stove subsequently, and be incubated 2-4h; Water-cooling pattern is adopted to carry out quench treatment afterwards; And when tup foundry goods is cooled to room temperature, is placed in heat treatment furnace and carries out temper, finally take out and be placed in air naturally cooling.
3. a kind of hammer mill wear-resistant hammer head according to claim 1 and 2, is characterized in that: described rotten component comprises the combination of any one composition or any several composition in Ti, Nb, Ce and La.
4. a kind of hammer mill wear-resistant hammer head according to claim 2, is characterized in that: the raw material in described step (1) comprises high carbon ferro-chrome, molybdenum-iron FeMo60, nickel plate, the pig iron and steel scrap; And need to carry out adding aluminium deep deoxidation in fusion process and carry out degasification and go to be mingled with process.
5. a kind of hammer mill wear-resistant hammer head according to claim 2, is characterized in that: in described step (4), the temperature of normalizing treatment is 650 DEG C, and duration is 2-4h; The temperature of temper is 250-400 DEG C, and duration is 2-3h.
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