CN105695878A - Manganese-tungsten-titanium wear-resistant cast steel and preparation method thereof - Google Patents
Manganese-tungsten-titanium wear-resistant cast steel and preparation method thereof Download PDFInfo
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- CN105695878A CN105695878A CN201610253154.0A CN201610253154A CN105695878A CN 105695878 A CN105695878 A CN 105695878A CN 201610253154 A CN201610253154 A CN 201610253154A CN 105695878 A CN105695878 A CN 105695878A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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Abstract
The invention relates to the field of wear-resistant cast steel, in particular to a manganese-tungsten-titanium wear-resistant cast steel and a preparation method thereof. The wear-resistant cast steel is prepared from, by mass, 0.20-0.35% of C, 1.0-2.0% of W, 0.5-1.5% of Si, 0.8-1.5% of Mn, 1.0-2.0% of Cr, 1.0-2.0% of Ti, smaller than or equal to 0.04% of S, smaller than or equal to 0.04% of P and the balance Fe. In the preparation process, tungsten atoms exist in molten steel and can partially substitute iron atoms in carbide in position, (W,Fe)3C is formed, the microhardness of common cementite is about 800 Hv, the microhardness can be improved by adding tungsten atoms and can reach 1600-1800 Hv or so, and thus the hardness of the cast steel is improved; meanwhile, the element Ti is added, molten steel can generate adequate nucleation sites TiC, and thus the particle number of the cast steel is greatly increased.
Description
Technical field
The present invention relates to wear-resistant cast steel Material Field, specifically abrasion resistant Mn-W-Ti casting steel and preparation method thereof。
Background technology
It is mostly that application has the high-abrasive material of martensite or bainite matrix or except martensite and bainite at present in high-abrasive material field, also there is beyond retained austenite matrix the third generation high-abrasive material-cast steel with high chromium exploitation wear-resisting spare part of particulates reinforcements, owing to also having the enhancing phase Cr7C3 of high rigidity in cast steel with high chromium, its carbide microhardness has reached HV1300～1600, therefore it has had than front two generation high-abrasive materials-spoken parts in traditional operas cast steel and potassium steel performance and has promoted by a relatively large margin, hardness can reach HRC60～65, but typically exhibit strip due to its carbide and comparison is thick, therefore its impact flexibility is general all between 3～7J/cm2, some also has lower than 3J/cm2, generally relatively low, material is relatively crisp, resistance to impact is poor, thus its comprehensive anti-wear performance is not still especially desirable。
Along with the operating modes such as some engineering machinery, mining machinery, metallurgical machinery are severe further and equipment maximizes, for instance in EQUIPMENT MARKET GUIDE such as sand making machine equipment, hot rolls, the high-abrasive material demand with more high-wearing feature is more and more urgent。In this case, forefathers, through lot of experiments, develop multiple high-abrasive material to manufacture wear-resisting key components and parts, to meet the service demand improving workpiece actual life under bad working environments。
Start to walk research and development based on composite abrasion resistance materials such as chromium, manganese, silicon in China, and has successfully started to be applied to hot roll wearing piece。Although the research of the aspects such as the coagulating property of composite abrasion resistance material of currently used casting technique exploitation, metamorphic mechanism and Technology for Heating Processing feature tends to ripe substantially。In high-abrasive material, carbide particle form has a variety of, presents several forms such as group's bulk spherical, big, shape of blooming, strip, shaft-like and vermiform；The spherical primary phase of group that wherein border is rounder and more smooth is optimal form, is conducive to performance boost。Therefore, by optimizing carbide particle form and distribution further, anti-wear performance and its stability to raising high-abrasive material are highly beneficial。
The metamorphism treatment method that high-abrasive material is adopted by prior art mainly uses rare earth silicon and magnesium or (containing B, containing Zr) potassium salt as inoculation modificator, to make consumption all between 0.5～1.0。Using conventional rare earth silicon, magnesium as alterant, rare earth has the effect of cleaning molten steel on the one hand, can generate compound with the oxygen in molten steel, nitrogen etc., and these compounds are also used as forming core particle and play the effect of refined carbides simultaneously；Rare earth is a kind of surface active element on the other hand, can being enriched in the surface of carbide, thus suppressing carbide to grow up along crystal boundary, making carbide refinement in process of setting。
Frequently with rare earth as alterant in prior art, utilize and during rare earth cleaning molten steel, produce the forming core particle as carbide such as a large amount of rare earth oxide, nitride；But the lattice types of these rare earth oxides, nitride is different from the lattice types of carbide。So these rare earth oxides, nitride can not as the effective heterogeneous forming core cores of carbide carbon compound, its effect is extremely limited。
Summary of the invention
For above-mentioned technical problem, the present invention provides the abrasion resistant Mn-W-Ti casting steel of a kind of dependable performance, the component of this material is by following mass percent composition: C:0.20-0.35%, W:1.0-2.0%, Si:0.5-1.5%, Mn:0.8-1.5%, Cr:1.0-2.0%, Ti:1.0-2.0%, S :≤0.04%, P :≤0.04%, surplus is ferrum；There is tungsten atom during preparation in molten steel, tungsten atom part can replace the position of iron atom in carbide, is formed (W, Fe)3C, and common cementite microhardness is about 800Hv, the membership that adds of tungsten atom makes microhardness improve, and can reach about 1600 1800Hv, thus improving the hardness of cast steel；It is also added into Ti element simultaneously, makes molten steel generate abundant forming core particle TiC so that it is amounts of particles is greatly increased。
The preparation method that the present invention also provides for a kind of abrasion resistant Mn-W-Ti casting steel, sequentially includes the following steps:
1) steel scrap, ferrotungsten, ferromanganese, ferrotianium and ferrochrome are cleaned out, carry out dispensing, sorting placement by above-mentioned mass percent requirement, and by stand-by after the drying of ferrotungsten, ferromanganese, ferrotianium and ferrochrome, drying is in order to avoid bringing gas in molten steel into；
2) in stove, then add steel scrap, add ferromanganese and ferrochrome carries out melting；
3) add ferrotungsten in the melting later stage, treat addition ferrotianium in melting down backward stove；
4) come out of the stove after being subsequently adding aluminum shot deoxidation；
5) molten steel after coming out of the stove is poured into a mould, and then carries out heat treatment。
As preferably, smelting temperature is 1550～1650 DEG C。
As preferably, the aluminum shot mass fraction that deoxidation adopts accounts for the 0.1%-0.15% of quality of molten steel。
As preferably, pouring temperature is 1500 DEG C。
As preferably, heat treatment adopts tempering of three quenchings。
As preferably, first with 950～1000 DEG C of 30min that quench, then adopt air cooling, then to carry out water-cooled after 900～950 DEG C of 30min that quench, then to carry out water-cooled after 600～800 DEG C of 5min that quench, but with 200～300 DEG C of laggard line space air cooling of tempering 2h finally。
As can be known from the above technical solutions, above-mentioned preparation method can make carbide particle form in anti-friction material more roll into a ball nodularization, it is distributed more uniform, overcome carbide in prior art to there are several less-than-ideal forms such as big bulk, shape of blooming, strip, shaft-like and vermiform and distribution of particles exists the deficiency of the forms such as Flos Chrysanthemi shape distribution and distribution, the combination property of raising material。
Detailed description of the invention
The present invention is described more detail below, and illustrative examples and explanation in this present invention are used for explaining the present invention, but not as a limitation of the invention。
The abrasion resistant Mn-W-Ti casting steel of the present invention is by following mass percent composition: C:0.20-0.35%, W:1.0-2.0%, Si:0.5-1.5%, Mn:0.8-1.5%, Cr:1.0-2.0%, Ti:1.0-2.0%, S :≤0.04%, P :≤0.04%, surplus is ferrum；Wherein,
Carbon C is most important for the microstructure and property of composite abrasion resistance material, and it both can be solid-solution in matrix and play solution strengthening effect, is again form carbide to strengthen the basic element of phase, moreover it is possible to promote martensite transfor mation, improve the hardenability of composite abrasion resistance material。Carbon content can increase material fragility too much, and the quantity then reducing carbide enhancing phase very little causes its wearability to reduce。Therefore, this material controls C content at 0.20-0.35%%。
Chromium Cr also can react formation Cr with C6C、Cr7C3And Cr23C6Deng carbide, but owing to the carbide microhardness of chromium is low, and its pattern is due to elongated and cause that its toughness is poor, preferentially forms in matrix process of setting；Therefore, in the present invention, the addition of Cr element is less, and a small amount of Cr can also make it be solid-solution in austenite, acts primarily as the hardenability and quenching degree effect that improve matrix。
Tungsten W, in the process preparing cast steel, can reduce austenite region, reduces carbon dissolubility in austenite, makes eutectic point and eutectoid point move to the direction that phosphorus content is low。Increase along with tungstenic amount, it is possible to decrease critical cooling rate, makes austenite be more likely to be changed into geneva or bainite, thus increasing matrix hardness so that tungsten based alloy cast steel has significantly high wearability。
Titanium Ti is carbide, reacts, with the C element in molten steel, the TiC particle forming tiny, Dispersed precipitate in a large number, it is possible to refinement austenite dendrites, improves form and the distribution of eutectic carbide。Therefore in composition designs, directly Ti content is controlled at 1.0-2.0%, directly alloy is added in molten steel, in order to being prone to fusing, the medium frequency induction melting furnace electromagnetic field stirring action passing through to adopt makes it produce TiC particle relatively uniform in a large number。But, in molten steel, Ti constituent content is very few or too much be all unfavorable for reaching actual effect, cross and be unfavorable at least making the matrix abundant crystallization nuclei particle of generation and eutectic carbide carry out refined carbides, cross the mobility making molten steel at most and mold-filling capacity reduces, it is unfavorable for improving workpiece compactness, anti-wear performance there is negative effect, so controlling its upper limit in its composition designs is 2.0%。
The heat treatment of the present invention adopts tempering of three quenchings, namely first with 950～1000 DEG C of 30min that quench, then air cooling is adopted, again to carry out water-cooled after 900～950 DEG C of 30min that quench, then to carry out water-cooled after 600～800 DEG C of 5min that quench, but with 200～300 DEG C of laggard line space air cooling of tempering 2h finally；This mode not only can obtain more austenite, and can increase the carbide hard particle formed in tissue drawing process, to improve hardness。
Embodiment 1
Steel scrap, ferrotungsten, ferromanganese, ferrotianium and ferrochrome are cleaned out, carry out dispensing by the stoicheiometry of mass fraction to be 0.20%C, 1.0%W, 1.5%Si, 1.5%Mn, 1.0%Cr, 1.0%Ti, 0.04%S, 0.04%P, surplus be ferrum, and sorting placement is stand-by after ferrotungsten, ferromanganese, ferrotianium and ferrochrome being dried；In order steel scrap good for above-mentioned configuration, ferromanganese, ferrochrome dispensing being put in stove and heated again, add ferrotungsten in the melting later stage, treat addition ferrotianium in melting down backward stove, smelting temperature is 1550 DEG C, and the aluminum shot deoxidation adding 0.1% after about 2min is come out of the stove；Pouring into a mould, pouring temperature is 1500 DEG C again；Then with 950 DEG C of 30min that quench, air cooling is then adopted, then to carry out water-cooled after 900 DEG C of 30min that quench, then to carry out water-cooled after 800 DEG C of 5min that quench, then with 300 DEG C of laggard line space air cooling of tempering 2h but, it is thus achieved that abrasion resistant Mn-W-Ti casting steel。This cast steel material being carried out performance test obtain: hardness 48.2HRC, yield limit is 1630MPa, and strength degree is 1710MPa, and impact toughness is 48J/cm2, extensibility is 5.1%。
Embodiment 2
Steel scrap, ferrotungsten, ferromanganese, ferrotianium and ferrochrome are cleaned out, carry out dispensing by the stoicheiometry of mass fraction to be 0.3%C, 1.5%W, 1%Si, 1.1%Mn, 1.5%Cr, 1.5%Ti, 0.03%S, 0.03%P, surplus be ferrum, and sorting placement is stand-by after ferrotungsten, ferromanganese, ferrotianium and ferrochrome being dried；In order steel scrap good for above-mentioned configuration, ferromanganese, ferrochrome dispensing being put in stove and heated again, add ferrotungsten in the melting later stage, treat addition ferrotianium in melting down backward stove, smelting temperature is 1600 DEG C, and the aluminum shot deoxidation adding 0.15% after about 2min is come out of the stove；Pouring into a mould, pouring temperature is 1500 DEG C again；Then with 970 DEG C of 30min that quench, air cooling is then adopted, then to carry out water-cooled after 940 DEG C of 30min that quench, then to carry out water-cooled after 700 DEG C of 5min that quench, then with 260 DEG C of laggard line space air cooling of tempering 2h but, it is thus achieved that abrasion resistant Mn-W-Ti casting steel。This cast steel material being carried out performance test obtain: hardness 50.6HRC, yield limit is 1680MPa, and strength degree is 1730MPa, and impact toughness is 50.1J/cm2, extensibility is 5.3%。
Embodiment 3
Steel scrap, ferrotungsten, ferromanganese, ferrotianium and ferrochrome are cleaned out, carry out dispensing by the stoicheiometry of mass fraction to be 0.35%C, 2.0%W, 0.5%Si, 0.8%Mn, 2.0%Cr, 2.0%Ti, 0.02%S, 0.03%P, surplus be ferrum, and sorting placement is stand-by after ferrotungsten, ferromanganese, ferrotianium and ferrochrome being dried；In order steel scrap good for above-mentioned configuration, ferromanganese, ferrochrome dispensing being put in stove and heated again, add ferrotungsten in the melting later stage, treat addition ferrotianium in melting down backward stove, smelting temperature is 1650 DEG C, and the aluminum shot deoxidation adding 0.1% after about 2min is come out of the stove；Pouring into a mould, pouring temperature is 1500 DEG C again；Then with 1000 DEG C of 30min that quench, air cooling is then adopted, then to carry out water-cooled after 950 DEG C of 30min that quench, then to carry out water-cooled after 600 DEG C of 5min that quench, then with 200 DEG C of laggard line space air cooling of tempering 2h but, it is thus achieved that abrasion resistant Mn-W-Ti casting steel。This cast steel material being carried out performance test obtain: hardness 48.3HRC, yield limit is 1610MPa, and strength degree is 1730MPa, and impact toughness is 49J/cm2, extensibility is 5.3%。
The technical scheme above embodiment of the present invention provided is described in detail, principle and the embodiment of the embodiment of the present invention are set forth by specific case used herein, and the explanation of above example is only applicable to help to understand the principle of the embodiment of the present invention；Simultaneously for one of ordinary skill in the art, according to the embodiment of the present invention, all will change in detailed description of the invention and range of application, in sum, this specification content should not be construed as limitation of the present invention。
Claims (7)
1. an abrasion resistant Mn-W-Ti casting steel, its component is by following mass percent composition: C:0.20-0.35%, W:1.0-2.0%, Si:0.5-1.5%, Mn:0.8-1.5%, Cr:1.0-2.0%, Ti:1.0-2.0%, S :≤0.04%, P :≤0.04%, surplus is ferrum。
2. a preparation method for abrasion resistant Mn-W-Ti casting steel described in claim 1, sequentially includes the following steps:
1) steel scrap, ferrotungsten, ferromanganese, ferrotianium and ferrochrome are cleaned out, carry out dispensing by above-mentioned mass percent requirement, sorting placement, and stand-by after ferrotungsten, ferromanganese, ferrotianium and ferrochrome are dried；
2) in stove, then add steel scrap, add ferromanganese and ferrochrome carries out melting；
3) add ferrotungsten in the melting later stage, after melting down, add ferrotianium；
4) come out of the stove after being subsequently adding aluminum shot deoxidation；
5) molten steel after coming out of the stove is poured into a mould, and then carries out heat treatment。
3. preparation method as claimed in claim 2, it is characterised in that: smelting temperature is 1550～1650 DEG C。
4. preparation method as claimed in claim 2, it is characterised in that: the mass fraction of the aluminum shot that deoxidation adopts accounts for the 0.1%-0.15% of quality of molten steel。
5. preparation method as claimed in claim 2, it is characterised in that: pouring temperature is 1500 DEG C。
6. preparation method as claimed in claim 5, it is characterised in that: heat treatment adopts tempering of three quenchings。
7. preparation method as claimed in claim 6, it is characterized in that: first with 950～1000 DEG C of 30min that quench, then air cooling is adopted, again to carry out water-cooled after 900～950 DEG C of 30min that quench, then to carry out water-cooled after 600～800 DEG C of 5min that quench, but with 200～300 DEG C of laggard line space air cooling of tempering 2h finally。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105779895A (en) * | 2016-04-22 | 2016-07-20 | 柳州凯通新材料科技有限公司 | Manganese-tungsten-titanium wear-resisting cast steel and machining process thereof |
| CN114000039A (en) * | 2021-11-04 | 2022-02-01 | 江西钨业控股集团有限公司 | Preparation method of wear-resistant alloy material |
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| CN101497963A (en) * | 2009-03-02 | 2009-08-05 | 暨南大学 | Medium alloy abrasion resistant steel and use thereof |
| CN101688283A (en) * | 2007-05-29 | 2010-03-31 | 杰富意钢铁株式会社 | Abrasion-resistant steel sheet having excellent processability, and method for production thereof |
| CN105779895A (en) * | 2016-04-22 | 2016-07-20 | 柳州凯通新材料科技有限公司 | Manganese-tungsten-titanium wear-resisting cast steel and machining process thereof |
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| CN101688283A (en) * | 2007-05-29 | 2010-03-31 | 杰富意钢铁株式会社 | Abrasion-resistant steel sheet having excellent processability, and method for production thereof |
| CN101381849A (en) * | 2008-01-07 | 2009-03-11 | 郑州大学 | Alloying wearproof heat-resistant steel |
| CN101497963A (en) * | 2009-03-02 | 2009-08-05 | 暨南大学 | Medium alloy abrasion resistant steel and use thereof |
| CN105779895A (en) * | 2016-04-22 | 2016-07-20 | 柳州凯通新材料科技有限公司 | Manganese-tungsten-titanium wear-resisting cast steel and machining process thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105779895A (en) * | 2016-04-22 | 2016-07-20 | 柳州凯通新材料科技有限公司 | Manganese-tungsten-titanium wear-resisting cast steel and machining process thereof |
| CN114000039A (en) * | 2021-11-04 | 2022-02-01 | 江西钨业控股集团有限公司 | Preparation method of wear-resistant alloy material |
| CN114000039B (en) * | 2021-11-04 | 2022-08-09 | 江西钨业控股集团有限公司 | Preparation method of wear-resistant alloy material |
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Application publication date: 20160622 |