CN104120333A - Wear-resistant cast iron material, preparation method thereof and helical blade guard plate made from wear-resistant cast iron material - Google Patents
Wear-resistant cast iron material, preparation method thereof and helical blade guard plate made from wear-resistant cast iron material Download PDFInfo
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- CN104120333A CN104120333A CN201410386912.7A CN201410386912A CN104120333A CN 104120333 A CN104120333 A CN 104120333A CN 201410386912 A CN201410386912 A CN 201410386912A CN 104120333 A CN104120333 A CN 104120333A
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Abstract
The invention discloses a wear-resistant cast iron material, a preparation thereof and a helical blade guard plate made from the wear-resistant cast iron material. The wear-resistant cast iron material is composed of the following chemical components by mass percent: 2.0-3.3% of C, not larger than 1.2% of Si, not larger than 2.0% of Mn, 23-30% of Cr, 0.8-1.2% of Ni, not larger than 0.05% of P, not larger than 0.05% of S, 0.3-0.5% of V, 0.08-0.12% of Ti and the balance of Fe. The hardenability, toughness and wear resistance of the cast iron material are good, the three alloy elements Ni, V, Ti are added to further improve the wear resistance of the material and enhance the strength, hardenability and toughness of the material. The preparation method of the material is simple and the operation is convenient, thereby being conductive to the production, application and promotion of the material. The helical blade guard plate made from the wear-resistant cast iron material has good impact toughness and wear resistance, if being applied on a helical blade, the integral wear resistance and impact toughness of the helical blade are obviously improved, the service lives of the helical blade and a helical assembly are prolonged, and the cost is saved.
Description
Technical field
The present invention relates to the methods and applications of a kind of metallic substance and preparation, be specifically related to a kind of abrasion-resistant cast iron material and prepare its method and its helical-blade backplate of making.
Background technology
Along with state of the art constantly improves, people require also more and more higher for the wear resistance of abrasion-resistant cast iron material, intensity, toughness, plasticity-etc.Traditional, wear resisting steel toughness is better, but its wear resistance is poor; And high chromium cast iron material (for example:
KmTBCr26) wear resisting property is excellent, but due to its single chromium (Cr) alloying make the hardening capacity of cast iron and toughness not enough, when casting and thermal treatment, crackle tendency is large, in use, also easily piece and brisement are fallen in generation in early days.
In ore dressing field, the helical stir of material and screw conveyor, particularly screw diameter are greater than the equipment of 1 meter extensively should (for example, ore dressing tower mill for Ultrafine Grinding, for ore grinding grading machine, particulate materials worm conveyor etc.).The general more complicated of operating mode of carrying out helical stir and helical feed is severe, the erosive wear of existing silt, there is again the cutter effect of rushing of the large-scale objects such as stone simultaneously, due to screw-blade, need the processing such as drawn welding (forming spiral assembly with turning axle), its material requires certain unit elongation and weldability, and this type of material wear resistance is all relatively low, to making screw-blade in use easy to wear and cause whole spiral assembly to scrap.
Summary of the invention
The technical problem to be solved in the present invention is to provide all good a kind of abrasion-resistant cast iron materials of a kind of hardening capacity, toughness and wear resistance.
In order to solve the problems of the technologies described above, the invention provides a kind of abrasion-resistant cast iron material, by the chemical composition of following mass percent, formed: C 2.0～3.3%, Si≤1.2%, Mn≤2.0%, Cr 23～30%, and Ni 0.8～1.2%, P≤0.05%, S≤0.05%, V 0.3～0.5%, and Ti 0.08～0.12%, and surplus is Fe.
The active chemical of a kind of abrasion-resistant cast iron material of the present invention is to design based on KmTBCr26, further determined the scope of Ni and newly added V, Ti element, its according to and limit the reasons are as follows of content range:
From production practice, we find the high chrome lining that adopts KmTBCr26 to produce, and decrepitation often occurs, and particularly shrink while being obstructed.And when foundry goods wall is too thick or wall thickness is irregular, residual stress can be very large, very easily there is again cold cracking, so this type of white cast iron part crackle tendency when casting and thermal treatment is all larger.Although in addition because KmTBCr26 foundry goods has very high wear resistance under the abrasive wear condition of sliding contact; But due to its poor toughness, under high angle gouging abrasion, will stress accumulate and fatigue flake, even fracture is broken.For example, a kind of helical-blade backplate that we produce by this material, can shrink and be obstructed, and wall is relatively thick and wall thickness is irregular during its profile casting, so often crack defect when casting and thermal treatment; In practice use, also easily piece and brisement are fallen in generation in early days.
Ni can further improve the hardening capacity of high-chromium white cast iron on the one hand, makes it obtain more wear-resisting martensite and M
7c
3microstructures of Eutectic Carbides.The more important thing is for large section high-chromium white cast iron, add effectively crystal grain thinning, the inhibition perlite of nickel (Ni) form (perlite white cast iron hot cracking tendency is maximum), increase its toughness, thereby greatly reduce crackle tendency.But nickel is also graphite element, and increase the quantity of residual austenite, too much nickel can make the wear resistance of this material decrease.Therefore the mass percent that limits nickel in this material is 0.8～1.2%.
The present invention newly adds V, Ti element, and its hardening capacity of foundry goods and toughness that KmTBCr26 is produced are improved, and further improve its wear resistance.
V is strong carbide forming element, forms the most wear-resisting MC type carbide, and VC hardness can reach HV2800, and disperse distribution, strengthening matrix; Vanadium (V) can make thick column crystal refinement, is again the element that increases whitening tendency and hardening capacity, and several respects can be strengthened this material wear ability; The mass percent of adding vanadium in this material is 0.3～0.5%.
Ti is strong carbide forming element especially, and TiC is more stable, does not dissolve, and TiC hardness can reach HV3200, and disperse distributes, and strengthening matrix, improves wear resistance.The mass percent of adding titanium in this material is 0.08～0.12%.
The present invention also provides the method for the above-mentioned a kind of abrasion-resistant cast iron material of the simple preparation of a kind of technique, comprises the following steps:
(1), the various throwing furnace charges except V, Ti are joined in intermediate frequency furnace and melted successively by above-mentioned composition and melting technology requirement;
(2), fine grain vanadium iron, ferrotianium are added in hot metal ladle, by the method for pouring, add V, Ti element.
(3), when iron liquid reaches 1490 ℃～1520 ℃, come out of the stove, while coming out of the stove, in hot metal ladle or in iron runner, add rare earth silicon and silico-calcium carries out inoculation;
(4), when reaching 1370 ℃～1400 ℃, pours into a mould iron liquid.
(5), to pouring into a mould rear foundry goods, be incubated cooling.
Further, above-mentioned foundry goods is carried out to 950 ℃～970 ℃ blowing normalizing treatment, then carry out 270 ℃～290 ℃ temper.
Another technical problem that the present invention will solve has been to provide the helical-blade backplate that a kind of impelling strength and the good a kind of abrasion-resistant cast iron material of wear resistance are made.
The present invention will solve the technical scheme that its another technical problem adopts: the helical-blade backplate that a kind of abrasion-resistant cast iron material is made, this backplate is the volution plate of being made by above-mentioned a kind of abrasion-resistant cast iron material.
Further, described plate downside is provided with step, for coordinate installation with screw-blade.
Further, described plate is provided with through hole, for fixing with screw-blade.
Further, described plate upside is provided with the step being tilted to, and makes this plate form outer thick interior thin plate, wear-resisting better effects if.
Further, this backplate is carried out to 950 ℃～970 ℃ blowing normalizing treatment, then carry out 270 ℃～290 ℃ temper.
The invention has the beneficial effects as follows: this abrasion-resistant cast iron material is based on KmTBCr26, but Ni, V have wherein been added, tri-kinds of alloying elements of Ti have not only further improved the wear resistance of this material, and strengthened intensity, hardening capacity and the toughness of this material, make it there is good hardening capacity, toughness and wear resistance simultaneously.By preparing the processing step of this abrasion-resistant cast iron material, can find out, the preparation method of this material is simple, easy to operate, is beneficial to production, application and the popularization of this material.The helical-blade backplate of making by above-mentioned abrasion-resistant cast iron material has good impelling strength and wear resistance, it is higher that the backplate made from KmTBCr26 material is compared this backplate surface average hardness, under the same terms, abrasion loss is below 80% of backplate that KmTBCr26 material is made, the helical-blade backplate of being made by this abrasion-resistant cast iron material is installed on screw-blade, wear resistance and the impelling strength of screw-blade integral body have obviously been improved, increase the work-ing life of screw-blade and spiral assembly, saved cost; This backplate also has the advantages such as mechanism is simple, easy for installation.
Accompanying drawing explanation
Fig. 1 is the enforcement structural representation of the helical-blade backplate made of a kind of abrasion-resistant cast iron material of the present invention;
Fig. 2 is the cross section view of helical-blade backplate in Fig. 1;
Fig. 3 is the application view of this helical-blade backplate on screw-blade;
Fig. 4 is the cross section view of helical-blade backplate application in Fig. 3;
In figure, be labeled as: plate 1, step 11, sloping platform rank 12, through hole 13, screw-blade 2, bolt 3.
Embodiment
An abrasion-resistant cast iron material, is comprised of the chemical composition of following mass percent: C 2.0～3.3%, Si≤1.2%, Mn≤2.0%, Cr 23～30%, and Ni 0.8～1.2%, P≤0.05%, S≤0.05%, V 0.3～0.5%, and Ti 0.08～0.12%, and surplus is Fe.
The quality percentage composition of controlling chemical composition not only makes this material have good hardening capacity, toughness and wear resistance simultaneously, can also improve the mechanical property of wear-resistant material.
Topmost improvement of the present invention is in material, further determined the scope of Ni and newly added V, Ti, and by V, Ti crystal grain thinning, solution strengthening matrix, further improves the over-all properties of material.V, Ti are all carbides, in cast iron, when V>=0.1%, are carbide precipitate VC in cast iron, and its microhardness is up to HV2800 (Chrome metal powder carbide M
7c
3microhardness only has HV1300-1800); In cast iron, Ti forms carbide TiC, and microhardness is up to HV3200.These carbide not only hardness are high, and tight with matrix combination, in abrasive wear process, neither can fragmentation also can not be out of shape, and have good abrasion resistance.V, Ti add the effect that can play microalloying, reduce the add-on of rare earth alterative, in order to cost-saving expense.Meanwhile, V, Ti can improve the mobility of molten iron while smelting.And V, Ti iron alloy can adopt vanadium titanium iron replace and smelt, and can greatly reduce production costs.V, Ti can comprehensively improve the Integrated using performance of cast iron materials, and improve more than 30% than the foundry goods that does not add V, Ti alloy work-ing life.
Embodiment 1
Abrasion-resistant cast iron material, is comprised of the chemical composition of following mass percent: C 2.1%, and Si 0.8%, and Mn 0.7%, and Cr 25.2%, and Ni 0.9%, and P 0.05%, and S 0.05%, and Ti 0.08%, and V 0.42%, and surplus is Fe and inevitable impurity.
The preparation method of the present embodiment abrasion-resistant cast iron material:
(1), by the material composition requirement in this embodiment, formulate proportion scheme; Various throwing furnace charges are joined in intermediate frequency furnace and melted successively by melting technology requirement, after energising, successively will the pig iron, steel scrap, ferrochrome drop in stove and heat and dissolve, moltenly add again nickel plate, ferrosilicon and ferromanganese after clearly; (2), fine grain vanadium iron, ferrotianium are added in hot metal ladle, by the method for pouring, add V, Ti element; (3) (chemical composition of mass percent forms: C 2.1% to OK range, to regulate composition, Si 0.8%, and Mn 0.7%, and Cr 25.2%, Ni 0.9%, P 0.05%, and S 0.05%, and Ti 0.08%, V 0.42%, surplus is Fe and inevitable impurity) after, temperature rises to 1505 ℃ and comes out of the stove, and adds rare earth silicon and silico-calcium carries out inoculation while coming out of the stove in hot metal ladle or in iron runner; (4), when reaching 1397 ℃, pours into a mould iron liquid; (5) to pouring into a mould rear foundry goods, be incubated coolingly, remove rising head, overlap, fash etc.; (6) foundry goods carries out machining in heat treatment furnace after anneal; (7) foundry goods is warmed up to 961 ℃ of blowing normalizing treatment in heat treatment furnace, then carries out temper at 289 ℃ of temperature.
Embodiment 2
Abrasion-resistant cast iron material, is comprised of the chemical composition of following mass percent: C 2.2%, and Si 0.8%, and Mn 0.6%, and Cr 25.4%, and Ni 0.9%, and P 0.045%, and S 0.049%, and Ti 0.10%, and V 0.38%, and surplus is Fe and inevitable impurity.
The preparation method of the present embodiment abrasion-resistant cast iron material:
(1), by the material composition requirement in this embodiment, formulate proportion scheme; Various throwing furnace charges are joined in intermediate frequency furnace and melted successively by melting technology requirement, after energising, successively will the pig iron, steel scrap, ferrochrome drop in stove and heat and dissolve, moltenly add again nickel plate, ferrosilicon and ferromanganese after clearly; (2), fine grain vanadium iron, ferrotianium are added in hot metal ladle, by the method for pouring, add V, Ti element; (3) (chemical composition of mass percent forms: C 2.2% to OK range, to regulate composition, Si 0.8%, and Mn 0.6%, and Cr 25.4%, Ni 0.9%, P 0.045%, and S 0.049%, and Ti 0.10%, V 0.38%, surplus is Fe and inevitable impurity) after, temperature rises to 1492 ℃ and comes out of the stove, and adds rare earth silicon and silico-calcium carries out inoculation while coming out of the stove in hot metal ladle or in iron runner; (4), when reaching 1373 ℃, pours into a mould iron liquid; (5) to pouring into a mould rear foundry goods, be incubated coolingly, remove rising head, overlap, fash etc.; (6) foundry goods carries out machining in heat treatment furnace after anneal; (7) foundry goods is warmed up to 969 ℃ of blowing normalizing treatment in heat treatment furnace, then carries out temper at 281 ℃ of temperature.
Below in conjunction with accompanying drawing, the helical-blade backplate of inventing a kind of abrasion-resistant cast iron material and making is described further.
As shown in Figure 1, 2, the helical-blade backplate that a kind of abrasion-resistant cast iron material is made, is the volution plate 1 of being made by described a kind of abrasion-resistant cast iron material.
Concrete, described plate 1 downside is provided with step 11; Described plate 1 is provided with through hole 13; Described plate 1 upside is provided with the sloping platform rank 12 that are tilted to; As shown in Figure 1,2,3, 4.
From Fig. 3,4, can find out, this backplate coordinates with screw-blade 2 by step 11, and is arranged on the upper surface of screw-blade 2; Bolt 3, through set through hole 13 on this backplate, is fixed on this backplate on screw-blade 2.Plate 1 upside is provided with the sloping platform rank 12 that are tilted to, and makes this plate 1 form outer thick interior thin backplate, and impelling strength and wear resistance are better.
Embodiment 3
The helical-blade backplate that a kind of abrasion-resistant cast iron material is made is selected a kind of abrasion-resistant cast iron material in the present invention, chemical composition by following mass percent forms: C 2.1%, Si 0.9%, and Mn 0.8%, and Cr 25.5%, Ni 0.9%, P 0.045%, and S 0.05%, and Ti 0.08%, V 0.44%, and surplus is Fe and inevitable impurity.
The manufacturing processed of the helical-blade backplate that a kind of abrasion-resistant cast iron material of the present embodiment is made:
(1), by the material composition requirement in this embodiment, formulate proportion scheme; Various throwing furnace charges are joined in intermediate frequency furnace and melted successively by melting technology requirement, after energising, successively will the pig iron, steel scrap, ferrochrome drop in stove and heat and dissolve, moltenly add again nickel plate, ferrosilicon and ferromanganese after clearly; (2), fine grain vanadium iron, ferrotianium are added in hot metal ladle, by the method for pouring, add V, Ti element; (3) (chemical composition of mass percent forms: C 2.1% to OK range, to regulate composition, Si 0.9%, and Mn 0.8%, and Cr 25.5%, Ni 0.9%, P 0.045%, and S 0.05%, and Ti 0.08%, V 0.44%, surplus is Fe and inevitable impurity) after, temperature rises to 1518 ℃ and comes out of the stove, and adds rare earth silicon and silico-calcium carries out inoculation while coming out of the stove in hot metal ladle or in iron runner; (4), when iron liquid reaches 1385 ℃, pour into a mould, iron liquid casting to making in the mould of this backplate; (5) to pouring into a mould rear foundry goods, be incubated coolingly, remove rising head, overlap, fash etc.; (6) foundry goods carries out machining in heat treatment furnace after anneal: step 11 being of uniform thickness with screw-blade 2 of plate 1 downside surface milling, on plate 2, bore two for fixing through hole 13, on sloping platform rank 12 of plate 1 upper surface milling, make thick and spiral inner side outside the spiral of plate 1; (7) backplate is warmed up to 952 ℃ of blowing normalizing treatment in heat treatment furnace, then carries out 272 ℃ of temper.
Simultaneous test:
Certain φ 3000 ore dressing tower mill helical-blade backplate: manufacture helical-blade backplate A with existing KmTBCr26 material; The helical-blade backplate B making with a kind of abrasion-resistant cast iron material of the present invention; Two material backplates all adopt identical casting technique and manage with furnace treatment.
Abrasive manner: wet type stirs
Abrading-ball: diameter phi 16, material is KmTBCr26, hardness 48～52HRC;
Abrasive material: 200 orders account for 60%;
Revolution speed of screw: 38 revs/min
Installation site: with machine duplex, helical-blade backplate A and helical-blade backplate B are installed respectively, are all positioned at first of screw-blade 2 foot (wearing and tearing are maximum) herein.
Testing data:
From the wearing and tearing quality of the known helical-blade backplate of above data A, be 99.6kg, the wearing and tearing quality of helical-blade backplate B is 74.9kg, the wearing and tearing quality of helical-blade backplate B be only helical-blade backplate A wearing and tearing quality 75.2%.Through application attestation, having used the life-span of the screw-blade 2 of this helical-blade backplate is the more than 5 times of common screw-blade 2 (not using helical-blade backplate).
The application of the helical-blade backplate of making by a kind of abrasion-resistant cast iron material of the present invention on screw-blade 2, impelling strength and the wear resistance of screw-blade 2 have been strengthened, greatly increased the work-ing life of screw-blade 2, spiral assembly be difficult for along bad, saved cost, this backplate is easy to use, installs and changes all very easy.
Claims (8)
1. an abrasion-resistant cast iron material, it is characterized in that, by the chemical composition of following mass percent, formed: C 2.0～3.3%, Si≤1.2%, Mn≤2.0%, Cr 23～30%, and Ni 0.8～1.2%, P≤0.05%, S≤0.05%, V 0.3～0.5%, and Ti 0.08～0.12%, and surplus is Fe.
2. the method for preparing a kind of abrasion-resistant cast iron material described in claim 1, is characterized in that, comprises the following steps:
(1), the various throwing furnace charges except V, Ti are joined in intermediate frequency furnace and melted successively by described composition and melting technology requirement;
(2), fine grain vanadium iron, ferrotianium are added in hot metal ladle, by the method for pouring, add V, Ti element;
(3), when iron liquid reaches 1490 ℃～1520 ℃, come out of the stove, while coming out of the stove, in hot metal ladle or in iron runner, add rare earth silicon and silico-calcium carries out inoculation;
(4), when reaching 1370 ℃～1400 ℃, pours into a mould iron liquid;
(5), to pouring into a mould rear foundry goods, be incubated cooling.
3. the method for a kind of abrasion-resistant cast iron material of preparation as claimed in claim 2, is characterized in that: foundry goods is carried out to 950 ℃～970 ℃ blowing normalizing treatment, then carry out 270 ℃～290 ℃ temper.
4. the helical-blade backplate that abrasion-resistant cast iron material is made, is characterized in that: by the made volution plate (1) of a kind of abrasion-resistant cast iron material claimed in claim 1.
5. the helical-blade backplate that a kind of abrasion-resistant cast iron material as claimed in claim 4 is made, is characterized in that: described plate (1) downside is provided with step (11).
6. the helical-blade backplate that a kind of abrasion-resistant cast iron material as claimed in claim 5 is made, is characterized in that: described plate (1) is provided with through hole (13).
7. the helical-blade backplate that a kind of abrasion-resistant cast iron material as claimed in claim 6 is made, is characterized in that: described plate (1) upside is provided with the sloping platform rank (12) that are tilted to.
8. the helical-blade backplate that a kind of abrasion-resistant cast iron material as described in any one in claim 4 to 7 is made, is characterized in that: this backplate is carried out to 950 ℃～970 ℃ blowing normalizing treatment, then carry out 270 ℃～290 ℃ temper.
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| CN106086707A (en) * | 2016-06-06 | 2016-11-09 | 浙江精龙刀剑有限公司 | A kind of daggers and swords riffled iron |
| CN107587030A (en) * | 2017-09-22 | 2018-01-16 | 徐工集团工程机械有限公司 | Paver screw material-distributing system, paver, helical blade and its manufacture method |
| CN107739969A (en) * | 2017-09-30 | 2018-02-27 | 南京赛达机械制造有限公司 | A kind of antifouling titanium alloy turbine blade and preparation method thereof |
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| CN105671416A (en) * | 2015-12-07 | 2016-06-15 | 铜陵市明诚铸造有限责任公司 | Low-density cast iron material for bearing of electric automobile |
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| CN107587030A (en) * | 2017-09-22 | 2018-01-16 | 徐工集团工程机械有限公司 | Paver screw material-distributing system, paver, helical blade and its manufacture method |
| CN107739969A (en) * | 2017-09-30 | 2018-02-27 | 南京赛达机械制造有限公司 | A kind of antifouling titanium alloy turbine blade and preparation method thereof |
| CN110453141A (en) * | 2019-09-06 | 2019-11-15 | 安徽信息工程学院 | One kind is for Pulp pump high ductility high chromium cast iron materials and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| CN104120333B (en) | 2017-01-25 |
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