CN103966498B - A kind of high chromium white antifriction cast iron high-abrasive material and manufacture method thereof - Google Patents
A kind of high chromium white antifriction cast iron high-abrasive material and manufacture method thereof Download PDFInfo
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Abstract
A kind of high chromium white antifriction cast iron high-abrasive material and manufacture method thereof, it belongs to a kind of cast iron materials and manufacture method thereof.It mainly solves the technical problems such as existing cast iron materials is relatively costly, wear no resistance, the suitability is poor, hardness is not enough, workpiece impact load is less.Its drip irrigation device is: raw-material weight percentage ratio is: Si, 0.60wt%～1.00wt% of Cr, 0.80wt%～1.20wt% of C, 22.0wt%～26.0wt% of 3.60wt%～4.20wt%, Mn;The B of Ti, 0.10wt%～0.20wt% of V, 0.10wt%～0.20wt% of Mo, 0.20wt%～0.30wt% of 0.50wt%～0.70wt%, surplus are Fe and inevitable impurity.It is mainly used for the quality control in the production of cast iron materials and production process.
Description
Technical field
The present invention relates to a kind of cast iron materials and manufacture method thereof, particularly a kind of high chromium white antifriction cast iron high-abrasive material and manufacture method thereof.
Background technology
At present, rich chromium cast iron, since coming out, has been considered as a kind of more satisfactory high-abrasive material always, has extensively applied in fields such as metallurgy, mine, building materials, electric power, traffic, machineries.Wear resistance castings in Large Crusher bull ring, tup, shot blast machine blade, and hot environment such as roll, blast furnace top bell, blast liner etc. are also widely used, and obtain good economic benefit.
M in rich chromium cast iron7C3The highest 1200-1800HV of hardness of type carbide, the hexagon that this carbide is isolated is shaft-like or lamellar is distributed in the base, because continuity degree reduces, make carbide that the destruction of matrix to be greatly reduced, so rich chromium cast iron makes moderate progress compared with the toughness of other white cast-iron.The increase of the carbide quantity in rich chromium cast iron can improve the wear resistance of material, but this hypereutectic high chromium cast iron is due to containing more nascent carbide, though having higher hardness and more preferable wearability, but, the fragility of primary carbide is the biggest, hypereutectic high chromium cast iron easily ftractures in casting and heat treatment process, causes casting wasted product rate high, it is impossible to is producing and is extensively applying in practice.Thus, the carbon equivalent of the rich chromium cast iron being widely used at present all is not above the upper limit of eutectic point, such as KmTBCr26, KmTBCr15Mo and KmTBCr12 etc. in China's material standard.
Hypereutectic high cast iron typically uses intermediate alloy that ferrum liquid is carried out Metamorphism treatment, makes carbide refinement, improves foundry goods toughness." hypereutectic cast iron of a kind of low cost high-wearing feature and the manufacture thereof " of patent No. CN100453674C publicity, breed in just using intermediate alloy+potassium salt+rare earth magnesium bag, use again alloyed powder current-following inoculation simultaneously, although rich chromium cast iron that can be more more satisfactory, but produce in batches because intermediate alloy needs customization, and strong reaction during these alloyed powder current-following inoculations, bigger to operator's hazardness, it is difficult to realize.
Summary of the invention
It is an object of the invention to provide a kind of material economy, wearability high, be applicable to manufacturing the flow passage part such as Pulp pump, material transporting elbow, its rotproofness and high mill property more have good combination, its hardness and wearability to be better than conventional rich chromium cast iron, the high chromium white antifriction cast iron high-abrasive material having the workpiece such as the blade of greater impact load, liner plate and manufacture method thereof corrosive wear.
The technical solution adopted for the present invention to solve the technical problems is: it includes C, Cr, Si, Mn, Mo, V, Ti, B, Fe, raw-material weight percentage ratio is: the C of 3.60wt%～4.20wt%, the Cr of 22.0wt%～26.0wt%, the Mo of Mn, 0.50wt%～the 0.70wt% of Si, 0.60wt%～the 1.00wt% of 0.80wt%～1.20wt%, the V of 0.20wt%～0.30wt%, the B of Ti, 0.10wt%～the 0.20wt% of 0.10wt%～0.20wt%, surplus is Fe and inevitable impurity.
Preparation method of the present invention is divided into casting process and heat treatment step, by raw material ratio, fusing, weigh ferrotianium, ferro-boron in proportion standby, bonded hard ferrite magnet is risen to 1400-1450 DEG C, the 0.20%-0.30% double deoxidizer adding ferrum liquid carries out pre-deoxidation, the pure aluminum wire adding 0.30%-0.40% carries out final deoxidizing, beat clean slag, add ferrotianium, ferro-boron, melting down slag taps a blast furnace liquid, tap a blast furnace in casting ladle, add the rare earth magnesium of 0.20%-0.30% before liquid, pour ferrum liquid and carry out Metamorphism treatment, the most pourable after rare earth magnesium reaction completely.
Ti, B of the present invention add after deoxidation.
Double deoxidizer of the present invention uses aluminum, silicon, calcium, barium composite commodity preparation.
The foundry goods of the high chromium white antifriction cast iron of casting is warming up to 1000 DEG C～1050 DEG C and carries out soft annealing by the present invention, the foundry goods of the high chromium white antifriction cast iron processed through soft annealing is warming up to 1050 DEG C～1150 DEG C quench, the foundry goods of the high chromium white antifriction cast iron through Quenching Treatment is warming up to 450 DEG C～550 DEG C and is tempered.
The invention has the beneficial effects as follows: use C3.1-3.4%Cr28-32 proportioning, without precious alloys such as Cu and Ni, less interpolation Mo, cost is suitable with common KMTBCr26, and this composition proportion is relatively easy to hold aborning simultaneously, and Melting Quality controls simple；Use rare earth alloy bag endometamorphism, significantly reduce the grain size of product；The composition proportion optimized, making the anti-wear performance changing alloy is 4-6 times of common KMTBCr26；Hardness is HRc60-65, and ballistic work (aKn) is >=3J；Adding with simple alloy and process optimization reduces the difficulty of batch production, this invention directly can apply to produce and the quality control of beneficially production process.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further details.
Embodiment 1, the present invention includes that C, Cr, Si, Mn, Mo, V, Ti, B, Fe, raw-material weight percentage ratio are: the Cr of C, 22.0wt%～26.0wt% of 3.60wt%～4.20wt%, carbon and chromium are two kinds of most important alloying elements in rich chromium cast iron.The wearability of rich chromium cast iron is to be determined by the quantity of carbide, the content of carbon and chromium the most directly determines the quantity of carbonization material, its volume fraction can be estimated by following formula: Φ carbide %=12.33wC+0.55wCr-15.2 improves carbon content can increase the quantity of carbide, but the eutectic point of rich chromium cast iron can be improved, eutectic point carbon content [content mark, wCE], eutectic carbon content changes with the change of chromium content, and concrete calculating refers to following formula: the M that wCE=4.40-0.054wCr chromium carbon ratio mass ratio has an effect in foundry goods7C3Type carbide and the relative populations of total carbides.When chromium carbon ratio is more than 5, major part M can be obtained7C3Type carbide, quenching degree might as well simultaneously, chromium carbon ratio more high-hardenability is the best, chromium has strong impact to rich chromium cast iron high-temperature oxidation resistance, reduce with the raising then oxidational losses of chromium content, i.e. non-oxidizability improves, C content in conventional rich chromium cast iron is 2.00wt%～3.30wt%, Cr content is 11.0wt%～30.0wt%, chromium carbon ratio is 4-8, hypoeutectic carbon content is generally individually used during composition design, for improving carbide quantity and the hardness of rich chromium cast iron, improve its non-oxidizability, ensure its quenching degree, therefore, the high chromium white antifriction cast iron that the present invention provides designs for hypereutectic composition, chromium carbon ratio is 8-10, C content therein is 3.10wt%～3.50wt%, Cr content is 28.0wt%～32.0wt%；The Si of 0.80wt%～1.20wt%, Si is more than manganese and chromium with the new of oxygen and power, it it is element needed for deoxidation, and the Ms point of rich chromium cast iron can be improved, reduce retained austenite, but the quenching degree that the content of Si too much can cause rich chromium cast iron reduces, the content of the middle Si of conventional rich chromium cast iron is≤1.20wt%, and in the high chromium white antifriction cast iron that the present invention provides, the preferred content of Si is 0.80wt%～1.20wt%；The Mn of 0.60wt%～1.00wt%, Mn can expand γ phase region, improve quenching degree, but manganese acutely reduces Ms point, more austenite is remained after making rich chromium cast iron quenching, Mn content in conventional high chromium casting is≤1.20wt%, and in the high chromium white antifriction cast iron that the present invention provides, the preferred content of Mn is 0.60wt%～1.00wt%；The Mo of 0.50wt%～0.70wt%, Mo can improve quenching degree, little on martensite start temperature Ms impact, and can control to reduce hot tearing sensitivity, the Mo content in conventional rich chromium cast iron is≤3.00wt%, suitably adjusts according to the wall thickness of cast iron, the chromium carbon ratio of the high chromium white antifriction cast iron that the present invention provides reaches 8-10, therefore, the preferred content of Mo is 0.50wt%～0.70wt%, to reduce production cost；The V of 0.20wt%～0.30wt%, according to test, V can promote carbide spheroidization, better in conjunction with adding rare earth magnesium during melting, simultaneously because of VC or V4C3Formation promote primary carbide refinement and minimizing, improve casting and the heat treatment performance of rich chromium cast iron, and then improve the impact toughness of workpiece, but the vanadium of excess can react with casting mold in cast and foundry goods cooling procedure, produce pin pore, therefore, in the high chromium white antifriction cast iron that the present invention provides, the content of V is 0.20wt%～0.30wt%；The Ti of 0.10wt%～0.20wt%, according to test, Ti is carbide, and it is 3160 DEG C that TiC has higher formation temperature melting point, during casting solidification, primary carbide can depend on and grow on TiC, refinement primary carbide, improve casting and heat treatment performance, improve the toughness of workpiece, but the Ti of excess makes ferrum liquid deterioration, form substantial amounts of oxidizing slag, mo(U)ld face is depended in casting process, or be wrapped in foundry goods, affect wearability and the impact toughness of workpiece, the serious qualification rate reducing foundry goods, therefore, in the high chromium white antifriction cast iron that the present invention provides, the content of Ti is 0.10wt%～0.20wt%；The B of 0.10wt%～0.20wt%, according to test, B can be effectively improved the hardness of rich chromium cast iron, and the compound that hardness is higher can be produced, thus improve the wearability of rich chromium cast iron, but too high boron easily makes rich chromium cast iron produce reticular tissue, reduces impact toughness, therefore, in the high chromium white antifriction cast iron that the present invention provides, the content of B is 0.10wt%～0.20wt%；Surplus is Fe and inevitable impurity, and described inevitable impurity object lesson is P, S, and described P content is preferably smaller than 0.060wt%, described S content is preferably smaller than 0.060wt%.
nullEmbodiment 2，Preparation method of the present invention is divided into casting process and heat treatment step，By raw material ratio、Fusing，Weigh ferrotianium in proportion、Ferro-boron is standby，A small amount of steel scrap is added before melting，Ferrochrome is added after scrap melting、Molybdenum-iron，Bonded hard ferrite magnet is risen to 1400-1450 DEG C，The 0.20%-0.30% double deoxidizer adding ferrum liquid carries out pre-deoxidation，The pure aluminum wire adding 0.30%-0.40% carries out final deoxidizing，Beat clean slag，About reach melting down sample examination during the 70-80% of heat size，Composition adjustment reaches thermometric after requirement，Tapping temperature 1480 ± 15 DEG C，Adjust each chemical element content on request，Add ferrotianium、Ferro-boron，Melting down slag taps a blast furnace liquid，Tap a blast furnace in casting ladle, add the rare earth magnesium of 0.20%-0.30% before liquid，Pour ferrum liquid and carry out Metamorphism treatment，With slag rod, the alterant reacted the most completely is stirred，After rare earth magnesium reaction completely the most pourable.Remaining is with embodiment 1.
Embodiment 3, Ti, B of the present invention add after deoxidation.Remaining same above-described embodiment.
Embodiment 4, double deoxidizer of the present invention uses aluminum, silicon, calcium, barium composite commodity preparation.Remaining same above-described embodiment.
Embodiment 5, the foundry goods of the high chromium white antifriction cast iron of casting is warming up to 1000 DEG C～1050 DEG C and carries out soft annealing by the present invention, and 1000-1050 DEG C is incubated 3 hours, air cooling of coming out of the stove after furnace cooling to 550 DEG C；The foundry goods of the high chromium white antifriction cast iron processed through soft annealing being warming up to 1050 DEG C～1150 DEG C quench, 1100 DEG C are incubated 3 hours, come out of the stove air-cooled, it is necessary to forcing cooling with aerator, otherwise hardness is unable to reach, and can affect wearability；The foundry goods of the high chromium white antifriction cast iron through Quenching Treatment being warming up to 450 DEG C～550 DEG C be tempered, 520 DEG C of insulations were come out of the stove air cooling after 3 hours.Remaining same above-described embodiment.
Claims (2)
1. a high chromium white antifriction cast iron high-abrasive material, it is characterized in that: it includes C, Cr, Si, Mn, Mo, V, Ti, B, Fe, raw-material weight percentage ratio is: the Si of Cr, 0.80wt%～the 1.20wt% of C, 22.0wt%～the 26.0wt% of 3.60wt%～4.20wt%, the Mn of 0.60wt%～1.00wt%, the Ti of V, 0.10wt%～the 0.20wt% of Mo, 0.20wt%～the 0.30wt% of 0.50wt%～0.70wt%, the B of 0.10wt%～0.20wt%, surplus is Fe and inevitable impurity；The foundry goods of the high chromium white antifriction cast iron of casting is warming up to 1000 DEG C～1050 DEG C and carries out soft annealing, the foundry goods of the high chromium white antifriction cast iron processed through soft annealing is warming up to 1050 DEG C～1150 DEG C quench, the foundry goods of the high chromium white antifriction cast iron through Quenching Treatment is warming up to 450 DEG C～550 DEG C and is tempered.
High chromium white antifriction cast iron high-abrasive material the most according to claim 1, is characterized in that: described Ti, B add after deoxidation.
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| CN107020352A (en) * | 2017-05-16 | 2017-08-08 | 东洋铁球（马鞍山）有限公司 | A kind of rich chromium cast iron tup casting technique |
| CN107130166A (en) * | 2017-05-17 | 2017-09-05 | 安徽巨泰机械制造有限公司 | A kind of wear-resisting High Hardness High Chromium cast iron and its production technology |
| 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 |
| CN113025874B (en) * | 2021-03-29 | 2022-07-19 | 北京工业大学 | Hypereutectic high-chromium cast iron and inoculation modification treatment method thereof |
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