CN101260497A - Boron-containing high-chromium abrasion-proof cast iron and preparation method thereof - Google Patents
Boron-containing high-chromium abrasion-proof cast iron and preparation method thereof Download PDFInfo
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Abstract
The invention relates to boracic high chromium wear resistant cast iron and a preparation method thereof, belonging to the wear resistant metal material technical field. The prior boracic high chromium cast iron has poor toughness and high cost. The cast iron of the invention comprises the following compositions in percentage by weight (wt percent): 2.5 to 3.5 percent of carbon, 15 to 28 percent of chromium, 0.5 to 1.2 percent of silicon, 0.5 to 1.2 percent of manganese, 0.15 to 0.3 percent of boron, 0.008 to 0.03 percent of calcium, 0.03 to 0.08 percent of barium, 0.02 to 0.05 percent of strontium, 0.03 to 0.08 percent of aluminum, 0.20 to 0.5 percent of titanium, 0.02 to 0.06 percent of lanthanum, 0.02 to 0.06 percent of cerium, less than 0.04 percent of sulfur, less than 0.05 percent of phosphor, the balance being iron; the content of lanthanum and cerium is more than or equal to 0.05 percent and less than or equal to 0.1 percent; the content of chromium or carbon is more than or equal to 6 percent and less than or equal to 8 percent. In the invention, the temperature of cast iron is kept between 980 DEG C and 1050 DEG C for 4h to 6h, then kept between 250 DEG C and 500 DEG C for 8h to 10h, thereby obtaining the cast iron. The boracic high chromium wear resistant cast iron has the advantages of high intensity and rigidity, good toughness and wear resistance, low production cost, etc.
Description
Technical field
The invention belongs to the wear-resistant metal material technical field, be specifically related to a kind of boron-containing high-chromium abrasion-proof cast iron and preparation method thereof.
Background technology
Along with science and technology development, show the saving day of the material and the energy important.Wearing and tearing are to reduce machine and instrument efficient, precision even it is scrapped, and cause the major reason of spillage of material and energy consumption, also are one of three kinds of main form of invalidation of mechanical component (wearing and tearing, corrosion and fracture).Since the mankind use machine to replace hand labour, how to prolong the work-ing life of machine, reduce the loss of part, be one of problem of being concerned about of people all the time, many for this reason people have carried out long-term exploration and research.Statistical information shows: nearly 75%～80% in the mechanical component that lost efficacy, belong to galling, and the energy of supply equipment nearly 30%～50% is consumed in the friction and wear process.
Wearing and tearing generally are divided into several types such as abrasive wear, adhesive wear, erosive wear, fretting wear, corrosive wear and fatigue wear.Wherein abrasive wear accounts for 50% of wearing and tearing total amount, has become a major reason of department's equipment failure such as metallurgy, mine, machinery, electric power, coal, petrochemical industry, traffic, Aeronautics and Astronautics and military project or material damage, and the harm that brings is the most serious.Its extensive existence makes the annual financial loss of industrial country reach 1～4% of gross national product.Therefore, research abrasive wear mechanism is explored and is caused the wear and tear in machines failure reasons, seek effectively and economical high-abrasive material and wear-resistant technology, and the advanced wear-resistant foundry goods technology of preparing of research, reduce fret wear consumption, significant to national economy.
The high-abrasive material of widespread use at present mainly contains three major types: 1. high mangaenese steel; 2. low, interalloy wear resisting steel; 3. white cast iron.High mangaenese steel is since 1882 come out, and the history in existing more than 100 year becomes traditional high-abrasive material, and used widely.China almost used high mangaenese steel in 50～sixties of 20th century as omnipotent high-abrasive material.Find in the practice that high mangaenese steel is made the wearing piece restriction of having ready conditions, and is only impacting under the situation big, that stress is high, abrasive material is hard, high mangaenese steel ability is wear-resisting.And its yield strength is low, easily deformable.Therefore, substituted by other high-abrasive material gradually in a lot of fields.Low, interalloy wear resisting steel is based on silicon, manganese, adds chromium, molybdenum, nickel and other trace element and grows up.Its alloy system is tied to the polynary composite system of chromium-manganese-silicon-molybdenum-nickel-other trace element of complicated component by the simple single manganese of composition system, silicon system, chromium system, chromium manganese.Low, interalloy wear resisting steel has better strength and toughness, and the wear resistance under low, middle shock load is better than high mangaenese steel, but has hardening capacity and the low deficiency of hardenability, and its wear resistance is relatively poor.Aspect 2 wear-resistant white cast, be extensive use of nickel hard white iron and high-chromium white cast iron both at home and abroad.The former as-cast structure be (Fe, Cr)
3C+ martensite+austenite, wherein carbide is the cementite that is continuous net-shaped distribution, microhardness is 840～1100HV, has resistance to abrasion preferably, but contains more expensive nickel, production cost height.The latter is because a large amount of addings (greater than 12%) of chromium, carbide be high rigidity (Cr, Fe)
7C
3Type carbide (Hv1300～1800), thus make it have good resistance to abrasion, and make high-chromium white cast iron obtain needed matrix by brief heat treating, to adapt to different wear working conditions.
In addition, it is better that rich chromium cast iron also has hardening capacity, temper resistance height, advantage such as the good and high-temperature oxidation of anti-corrosion wear performance is good.Therefore, rich chromium cast iron has been considered to comparatively one of ideal wear-resistant material always since coming out, and at home and abroad is extensive use of at present.But the big and thicker occasion of workpiece in load, still show toughness low with deficiency such as hardening capacity difference.In order to improve rich chromium cast iron hardening capacity, add expensive alloy element such as nickel, molybdenum usually, cause the rich chromium cast iron production cost sharply to rise.Add manganese element and also have the effect that improves hardening capacity, but can cause that retained austenite increases in the quenching structure, infringement rich chromium cast iron wear resistance, and will cause the carbide alligatoring after for molybdenum with manganese, thereby its toughness and resistance to abrasion all are lower than high Cr-Mo white cast iron.
Add trace B (0.0005%～0.005%) in the steel and can significantly improve hardening capacity and improve toughness, thereby can substitute a large amount of alloying elements and reduce production costs.Chinese invention patent CN1884605 discloses a kind of high chromium manganese multiple element trace alloy wearable material and manufacture method thereof, contains following composition in its finished product: carbon: 0.3～1%, chromium: 6～26%, manganese: 6～26%, silicon: 0.3～1.2%, copper: 0.07～0.1%, boron: 0.001～0.002%, sulphur: 0.01～0.04%, phosphorus: 0.02～0.05%.This invention is to be that lever is regulated chromium and two kinds of elements of manganese with the carbon content, chromium and two kinds of elements of manganese is organically combined, and added trace B and be used to improve hardening capacity, the product of producing is carried out high tempering handle, partly the tough processing of position water.So the produced high chromium manganese multiple element trace alloy wearable material of this invention have that resistance to abrasion is strong, good toughness, indehiscent advantage, long 1～1.5 times of the high-abrasive material of producing than original old-fashioned prescription its work-ing life.Chinese invention patent CN1189542A discloses a kind of Mn-Si-B multielement micro-alloyed air cooled bainitic steel, its chemical composition content is (wt.%): 0.35～0.60C, 2.00～3.50Mn, 0.20～2.00Si, 0.0005～0.010B, 0.015～0.05Ti, 0.02～0.10RE, 0.006～0.015N, 0.30～2.50Cr, 0.03～0.15V, 0.03～0.15Nb, surplus Fe.This Alloy Cast Steel is after composite inoculating is handled, the crystal grain of steel is tiny, the obvious refinement of microstructure, and the carbide dispersion uniform distribution is arranged, because boron has the good hardening capacity effect that improves, it is main can obtaining bainite-martensite under the air cooling condition, and the polyphase structure of carbide-containing and retained austenite, has high rigidity, high strength, high-wearing feature and high-hardenability.In the rich chromium cast iron, add the boron of some amount, part enters carbide, and part enters matrix, improves hardening capacity, improves wear resistance.
Japanese Patent JP3150334-A, JP93041691-B disclose a kind of boron-containing high-chromium abrasion-proof cast iron, its main component is: 2.7～3.5%C, 0.2～1.0%Si, 0.5～1.5%Mn, 27～34%Cr, 0.5～2.0%Mo, 0.5～2.0%W ,≤0.1%B is after 950～1100 ℃ of normalizings and 200～500 ℃ of tempering, hardness reaches more than the 62HRC, and the summer surpasses 0.23 than shock strength.Because boron content is less, therefore in order to improve hardening capacity, also added 0.5～2.0%Mo, increased the rich chromium cast iron production cost.Russ P RU2169787-C2 discloses a kind of method of producing the alloy white cast iron abrading-ball, and its main component is (wt%): 2.2～3.5C; 0.3～0.6Si; 6.0～12.0Cr; 4.0～6.0Mn; 0.5～0.8Mo; 0.1～0.3B; 0.1～0.3Ti; 0.3～0.6Ni.At first on continuous caster, pour into circular strand, be heated to 950～1050 ℃ after, rolling balling-up subsequently 680～700 ℃ of tempering, is incubated air cooling after 4～5 hours, abrading-ball has good mechanical performance and excellent abrasive.Because chromium content is lower in the abrading-ball, for guaranteeing its hardening capacity, has also added 0.5～0.8%Mo and 0.3～0.6%Ni, has increased production cost.
Although boron-containing high-chromium cast iron has good resistance to abrasion, the adding of boron causes carbide quantity to increase, and will cause that rich chromium cast iron toughness descends, and boron-containing high-chromium cast iron does not obtain extensive promotion and application always.Therefore, in most of rich chromium cast iron goods both domestic and external, still need to add expensive alloy element such as molybdenum, nickel at present, the rich chromium cast iron production cost is generally higher, and manufacturing enterprise's benefit is low.Therefore,, improve boron-containing high-chromium cast iron microstructure, improve its intensity and toughness, enlarging applying and to have very important significance of boron-containing high-chromium cast iron utilizing boron to improve under the rich chromium cast iron hardening capacity prerequisite.
Summary of the invention
The object of the invention is to solve the problems of the prior art, and a kind of boron-containing high-chromium abrasion-proof cast iron and preparation method thereof is provided.Its principal feature is to use the electrosmelting rich chromium cast iron, use the silicocalcium pre-deoxidation, with aluminium final deoxygenation and microalloying, and decide nitrogen with titanium, with ferro-boron rich chromium cast iron is realized the boron alloy processing, add barium silicon alloy, strontium silicon alloy and mixed rare earth of lanthanum and cerium at last, refinement boron-containing high-chromium abrasion-proof cast iron solidified structure, the intensity and the toughness of raising boron-containing high-chromium abrasion-proof cast iron.
Purpose of the present invention can be achieved through the following technical solutions:
The chemical ingredients of boron-containing high-chromium abrasion-proof cast iron provided by the present invention and weight percent thereof are: C:2.5～3.5%, Cr:15.0～28.0%, Si:0.5～1.2%, Mn:0.5～1.2%, B:0.15～0.30%, Ca:0.008～0.03%, Ba:0.03～0.08%, Sr:0.02～0.05%, Al:0.03～0.08%, Ti:0.20～0.50%, La:0.02～0.06%, Ce:0.02～0.06%, S＜0.04%, P＜0.05%, surplus is Fe, and 0.05%≤La+Ce≤0.10%, 6.0≤Cr/C≤8.0.
Boron-containing high-chromium abrasion-proof cast iron provided by the present invention electric furnace production, concrete steps are as follows:
1. with steel scrap, ferrochrome, the pig iron, ferrosilicon, ferromanganese, silicocalcium, the barium silicon alloy, the strontium silicon alloy, aluminium, ferrotianium, ferro-boron and mixed rare earth of lanthanum and cerium according to target in the product weight percent of chemical ingredients get the raw materials ready, C:2.5～3.5%, Cr:15.0～28.0%, Si:0.5～1.2%, Mn:0.5～1.2%, B:0.15～0.30%, Ca:0.008～0.03%, Ba:0.03～0.08%, Sr:0.02～0.05%, Al:0.03～0.08%, Ti:0.20～0.50%, La:0.02～0.06%, Ce:0.02～0.06%, S＜0.04%, P＜0.05%, surplus is Fe, and 0.05%≤La+Ce≤0.10%, 6.0≤Cr/C≤8.0;
2. steel scrap, ferrochrome and the pig iron are mixed and put into the stove heat fused, the molten clear back of molten iron adds ferrosilicon and ferromanganese;
3. the stokehold is adjusted to branch and temperature is risen to 1560～1600 ℃ after qualified, adds the silicocalcium pre-deoxidation, and pre-deoxidation is after 1～2 minute, add the aluminium final deoxygenation, final deoxygenation added ferrotianium after 1～2 minute, ferrotianium added after 1～2 minute, added ferro-boron, and ferro-boron added after 1～2 minute comes out of the stove;
4. barium silicon alloy, strontium silicon alloy and mixed rare earth of lanthanum and cerium are crushed to the fritter that granularity is 4～10mm, after 150～180 ℃ of oven dry, place casting ladle bottom, with the method that pours in wrapping to the processing of going bad of step molten iron 3.;
5. step molten iron is 4. poured into foundry goods, molten steel pouring temperature is 1420～1480 ℃;
6. the foundry goods that 5. step is made carries out normalizing treatment at 980～1050 ℃, 4～6 hours casting parts thermal insulation time;
7. the foundry goods after the normalizing treatment is carried out temper at 250～500 ℃, tempering insulation time 8～10 hours makes boron-containing high-chromium abrasion-proof cast iron.
The performance of cast iron quality is by the metallographic structure decision, and certain tissue depends on chemical ingredients and thermal treatment process, and chemical ingredients of the present invention is to determine like this:
C:C influences rich chromium cast iron hardness and flexible principal element, and when C content was high, carbide quantity was many in the tissue, the matrix hardness height, and wear resistance is good.Along with C content increases, carbide significantly increases, and is distributed on the crystal boundary more, so toughness descends.Wear resistance and toughness for taking into account rich chromium cast iron are controlled at 2.5～3.5% with C content.
Cr:Cr is the main alloy element in the rich chromium cast iron, and Cr content is greater than 12% o'clock, carbide be mainly high rigidity (Cr, Fe)
7C
3The type carbide, thus make rich chromium cast iron have good resistance to abrasion.But the Cr too high levels, material melting difficulty, castability worsens, and cost significantly raises.In addition, (Cr/C) is controlled at 6.0～8.0 with the chromium carbon ratio, mainly for obtain high rigidity (Cr, Fe)
7C
3The type carbide, (Cr/C) is too high or too low for the chromium carbon ratio, all be unfavorable for obtaining high rigidity (Cr, Fe)
7C
3The type carbide.Take all factors into consideration Cr content is controlled at 15.0～28.0%.
Si and Mn: adding an amount of Si and Mn in the rich chromium cast iron, mainly is in order to play a desoxydatoin, and Mn improves the hardening capacity effect in addition, and the Mn add-on is too much, causes that retained austenite increases in the normalized structure, reduces rich chromium cast iron hardness, is unfavorable for improving wear resistance.Therefore Si content is controlled at 0.5～1.2%, Mn content is controlled at 0.5～1.2%.
B:B is a kind of special element, and ordination number is 5, between metal and nonmetal between, can metallizing again can with nonmetal chemical combination.Add an amount of B in rich chromium cast iron, the portion C atom in the replaceable carbonization thing of B forms and contains the alloy carbide of B, and the carbide volume fraction is increased with B content, and contain B carbide average hardness than (Cr, Fe)
7C
3The type carbide improves, and contains the easier friction of B rich chromium cast iron and brings out martensitic transformation, produces work hardening, and its resistance to abrasion does not have B rich chromium cast iron height yet.B also has a spot of solid solution in matrix simultaneously, because the difference of atomic size causes the lattice distortion, the microhardness of matrix is improved.In addition, because the B atomic radius is less, very easily produce poly-partially at crystal boundary.The B that gathers partially on austenite grain boundary can suppress ferrite cenotype forming core, helps improving the hardening capacity of rich chromium cast iron.These effects of B are favourable to improving the rich chromium cast iron resistance to abrasion.But the adding of B element causes carbon-boron compound quantity to increase, and will cause that rich chromium cast iron toughness descends, and takes all factors into consideration B content is controlled at 0.15～0.30%.
La and Ce: rare-earth elements La and Ce have the effect of stronger deoxidation, desulfuration purifying molten iron, thereby iron liquid surface tension is improved greatly, and condensate depression increases, and nucleation rate is improved greatly, and the primary austenite nucleus increases, structure refinement.After adding an amount of La and Ce in addition, the formed corresponding product of its deoxidation desulfuration can be used as the forming core substrate of primary crystal again, core is increased, grain refining.The trend that residual iron liquid phase was spaced mutually when the refinement of primary austenite caused eutectic reaction has strengthened, and causes the crystallization of " divorce " mode, and residual iron liquid further is separated, and therefore, the eutectic carbides bar is shortened.The adding of La and Ce also helps and alleviates the boron segregation.La and Ce add-on are too much, cause that inclusion increases in the cast iron, damage cast iron intensity and toughness on the contrary, therefore La content are controlled at 0.02～0.06%, and Ce content is controlled at 0.02-0.06%, and the total content of La and Ce is controlled at 0.05～0.10%.
It mainly is for deoxidation that Al:Al adds in the rich chromium cast iron, the Al that remains in the iron liquid is dissolved in carbide hardly, it is enriched in the crystallization forward position of carbide during eutectic reaction, cause composition cold excessively, stop the carbide tip growth, make its edge passivation, help improving carbide morphology and distribution, improve rich chromium cast iron mechanical property and wear resistance.The Al add-on is too much, and inclusion is increased, and therefore infringement cast iron intensity and toughness are controlled at 0.03～0.08% with Al content.
Ca:Ca has good deoxidation, desulfuration ability, improves the hot metal purifying degree, helps refinement boron-containing high-chromium cast iron solidified structure, improves boron-containing high-chromium cast iron intensity and toughness.Appropriate C a add-on is 0.008～0.03%.
The forming core of primary austenite when Ba:Ba promotes boron-containing high-chromium cast iron solidified, and under bigger eutectic condensate depression, form be evenly distributed, branch is less, full-blown austenite crystal.Eutectic carbides has forming core, growth in the melt of enough carbon concentration in the primary austenite interdendritic, be subjected to the obstruction of primary phase and can not grow up arbitrarily, thereby help forming discontinuous lath-shaped carbide, has suppressed the appearance of Cai Shi body eutectic.In addition, (Cr, Fe)
7C
3The strong bond of type carbide (covalent linkage) direction is its dominant growth direction, and crystalline growth velocity is very fast in that this side up.Ba have reduction (Cr, Fe)
7C
3The effect of Fe-C covalent linkage intensity in the type carbide.The Ba element can change by the effect that changes bonding strength (Cr, Fe)
7C
3Type carbide growth pattern, make along crystal boundary growth (Cr, Fe)
7C
3The type carbide is changed into lath-shaped, discontinuous form, improves boron-containing high-chromium cast iron intensity and flexible purpose thereby reach, and suitable Ba add-on is 0.03～0.08%.
Can interact between Sr:Sr and the B, promote the growth of dendrite, optimize the boron-containing high-chromium structure of cast iron, improve cast iron.In addition, Sr improves the effect of boron-containing high-chromium iron casting density in addition, improves the cast iron result of use, and suitable Sr add-on should be controlled at 0.02～0.05%.
Ti: the rich chromium cast iron melt added the titanium elements fixed nitrogen earlier before adding boron, can stabilize and increase the boron recovery rate.In addition, Ti is the strong carbide forming element, and TiC has higher formation temperature (fusing point is 3160 ℃), the carbide of titanium, nitride and carboritride can be separated out as first precipitated phase in process of setting, promote the refinement of solidified structure, and alleviate the boron segregation, improve the intensity and the toughness of rich chromium cast iron.The Ti add-on is too much, causes the compound quantity of titanium to increase, and damages cast iron intensity and toughness on the contrary, takes all factors into consideration, and Ti content is controlled at 0.20～0.50%.
Inevitably trace impurity is to bring in the raw material, and P and S are wherein arranged, and all is harmful elements, and intensity, toughness and wear resistance in order to guarantee rich chromium cast iron are controlled at P content below 0.05%, and S content is controlled at below 0.04%.
Compared with prior art, the present invention has following advantage:
1. boron-containing high-chromium abrasion-proof cast iron of the present invention replaces alloying elements such as expensive molybdenum, nickel with cheap boron, improve the hardening capacity of rich chromium cast iron, reduces rich chromium cast iron production cost 30～50%.
2. the present invention adopts element thinning solidification structures such as lanthanum, cerium mishmetal, titanium, calcium, barium, strontium, aluminium, alleviate element segregation, improve carbide morphology and distribution, improve the intensity and the toughness of boron-containing high-chromium abrasion-proof cast iron, wherein tensile strength surpasses 580Mpa, and impelling strength is greater than 10J/cm
2, hardness is greater than 62HRC.
3. the present invention adopts silicon-calcium alloy pre-deoxidation, and the aluminium final deoxygenation adopts the fixedly nitrogen in the iron liquid of titanium simultaneously, stablize and improved the recovery rate of boron, the recovery rate of boron improves the boron recovery rate more than 10% greater than 92% than usual way, makes the boron-containing high-chromium cast iron stable.
4. boron-containing high-chromium abrasion-proof cast iron of the present invention has excellent abrasive, has met or exceeded to contain molybdenum, nickel high-chromium white cast iron level.
The invention will be further described below in conjunction with embodiment.
Embodiment
Adopt 500 kilograms of medium-frequency induction furnace melting boron-containing high-chromium abrasion-proof cast irons.
Embodiment 1
1. steel scrap, ferrochrome and the pig iron are mixed and put into the stove heat fused, the molten clear back of molten iron adds ferrosilicon and ferromanganese;
2. the stokehold is adjusted to branch and temperature is risen to 1560～1600 ℃ after qualified, adds the silicocalcium pre-deoxidation; After the pre-deoxidation 1～2 minute, add the aluminium final deoxygenation; Behind the final deoxygenation 1～2 minute, add ferrotianium; Ferrotianium added after 1～2 minute, added ferro-boron; Ferro-boron added after 1～2 minute comes out of the stove;
3. barium silicon alloy, strontium silicon alloy and mixed rare earth of lanthanum and cerium are crushed to the fritter that granularity is 4～10mm, after 150～180 ℃ of oven dry, place casting ladle bottom, with the method that pours in wrapping to the molten iron processing of going bad;
4. molten iron is poured into foundry goods, molten steel pouring temperature is 1420～1480 ℃;
5. foundry goods is earlier carried out normalizing treatment at 980 ℃, insulation 6h carries out temper in 250 ℃ at last, and insulation 10h obtains boron-containing high-chromium abrasion-proof cast iron, and chemical ingredients sees Table 1, and mechanical property sees Table 2.
Embodiment 2
Step 1.～4. with embodiment 1 step 1.～4.;
5. again foundry goods is carried out normalizing treatment at 1050 ℃, insulation 4h carries out temper in 500 ℃ at last, and insulation 8h obtains boron-containing high-chromium abrasion-proof cast iron, and chemical ingredients sees Table 1, and mechanical property sees Table 2.
Embodiment 3
Step 1.～4. with embodiment 1 step 1.～4.;
5. again foundry goods is carried out normalizing treatment at 1000 ℃, insulation 5h carries out temper in 450 ℃ at last, and insulation 9h obtains boron-containing high-chromium abrasion-proof cast iron, and chemical ingredients sees Table 1, and mechanical property sees Table 2.
Embodiment 4
Step 1.～4. with embodiment 1 step 1.～4.;
5. again foundry goods is carried out normalizing treatment at 1020 ℃, insulation 4h carries out temper in 300 ℃ at last, and insulation 9h obtains boron-containing high-chromium abrasion-proof cast iron, and chemical ingredients sees Table 1, and mechanical property sees Table 2.
Embodiment 5
Step 1.～4. with embodiment 1 step 1.～4.;
5. again foundry goods is carried out normalizing treatment at 1010 ℃, insulation 5h carries out temper in 450 ℃ at last, and insulation 8h obtains boron-containing high-chromium abrasion-proof cast iron, and chemical ingredients sees Table 1, and mechanical property sees Table 2.
Table 1 boron-containing high-chromium abrasion-proof cast iron chemical ingredients and content thereof (weight %)
Table 2 boron-containing high-chromium abrasion-proof cast iron mechanical property
Produce foundry goods such as bar, tup, abrading-ball and liner plate with the boron-containing high-chromium abrasion-proof cast iron that the present invention is prepared, select the big bar installation examination of the wearing and tearing that withstand shocks for use.Bar is the consumable accessory of impact breaker, the bar of its rotor adapted, and in company with the rotation of rotor high-speed degree, mineral aggregate collides and is pulverized through the fierceness of bar and counterpunch board.Require bar that high wear resistance, toughness and intensity are arranged.The boron-containing high-chromium abrasion-proof cast iron bar is used for broken grouan in certain building stones source mill installation, and the impact crusher specification is φ 1000mm * 700mm, rotating speed is 650r/min, bar is of a size of 75mm * 75mm * 700mm, adorns three bars for every at every turn, and original design bar material is a high mangaenese steel.Test-results shows, boron-containing high-chromium abrasion-proof cast iron bar intensity height, good toughness, non-cracking, broken phenomenon occur in the use, also has high rigidity and good hardening capacity in addition, improve 4～6 times than high-manganese steel plate hammer its work-ing life, met or exceeded the level that contains molybdenum, nickel high-chromium white cast iron.The boron-containing high-chromium abrasion-proof cast iron bar does not contain valuable alloying elements such as molybdenum, nickel, its production cost ratio contains molybdenum, nickel rich chromium cast iron bar reduces by 30～50%, only improve about 20%, apply the boron-containing high-chromium abrasion-proof cast iron bar and have good economic and social benefit than high mangaenese steel.
Claims (2)
1, a kind of boron-containing high-chromium abrasion-proof cast iron, it is characterized in that, the chemical ingredients of cast iron and weight percent thereof are: C:2.5～3.5%, Cr:15.0～28.0%, Si:0.5～1.2%, Mn:0.5～1.2%, B:0.15～0.30%, Ca:0.008～0.03%, Ba:0.03～0.08%, Sr:0.02～0.05%, Al:0.03～0.08%, Ti:0.20～0.50%, La:0.02～0.06%, Ce:0.02～0.06%, S＜0.04%, P＜0.05%, surplus is Fe, and 0.05%≤La+Ce≤0.10%, 6.0≤Cr/C≤8.0.
2, the preparation method of the described a kind of boron-containing high-chromium abrasion-proof cast iron of claim 1 is characterized in that, may further comprise the steps:
1. with steel scrap, ferrochrome, the pig iron, ferrosilicon, ferromanganese, silicocalcium, the barium silicon alloy, the strontium silicon alloy, aluminium, ferrotianium, ferro-boron and mixed rare earth of lanthanum and cerium according to target in the product chemical component weight per-cent get the raw materials ready, C:2.5～3.5%, Cr:15.0～28.0%, Si:0.5～1.2%, Mn:0.5～1.2%, B:0.15～0.30%, Ca:0.008～0.03%, Ba:0.03～0.08%, Sr:0.02～0.05%, Al:0.03～0.08%, Ti:0.20～0.50%, La:0.02～0.06%, Ce:0.02～0.06%, S＜0.04%, P＜0.05%, surplus is Fe, and 0.05%≤La+Ce≤0.10%, 6.0≤Cr/C≤8.0;
2. steel scrap, ferrochrome and the pig iron are mixed and put into the stove heat fused, the molten clear back of molten iron adds ferrosilicon and ferromanganese;
3. the stokehold is adjusted to branch and temperature is risen to 1560～1600 ℃ after qualified, adds the silicocalcium pre-deoxidation, and pre-deoxidation is after 1～2 minute, add the aluminium final deoxygenation, final deoxygenation added ferrotianium after 1～2 minute, ferrotianium added after 1～2 minute, added ferro-boron, and ferro-boron added after 1～2 minute comes out of the stove;
4. barium silicon alloy, strontium silicon alloy and mixed rare earth of lanthanum and cerium are crushed to the fritter that granularity is 4～10mm, after 150～180 ℃ of oven dry, place casting ladle bottom, with the method that pours in wrapping to the processing of going bad of step molten iron 3.;
5. step molten iron is 4. poured into foundry goods, molten steel pouring temperature is 1420～1480 ℃;
6. the foundry goods that 5. step is made carries out normalizing treatment at 980～1050 ℃, 4～6 hours casting parts thermal insulation time;
7. the foundry goods after the normalizing treatment is carried out temper at 250～500 ℃, tempering insulation time 8～10 hours makes boron-containing high-chromium abrasion-proof cast iron.
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