CN103436773B - Preparation method of wear-resistant high-chromium cast iron - Google Patents

Preparation method of wear-resistant high-chromium cast iron Download PDF

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CN103436773B
CN103436773B CN201310367339.0A CN201310367339A CN103436773B CN 103436773 B CN103436773 B CN 103436773B CN 201310367339 A CN201310367339 A CN 201310367339A CN 103436773 B CN103436773 B CN 103436773B
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iron
cast iron
chromium cast
molten
antiwear
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CN103436773A (en
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符寒光
智小慧
雷永平
林健
吴中伟
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北京工业大学
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Abstract

The invention discloses a preparation method of wear-resistant high-chromium cast iron and belongs to the technical field of metal materials. According to the preparation method, common scrap steel, carburant, ferrochromium, ferromolybdenum, copper plates, ferrochromium nitride, ferrosilicon, ferromanganese, ferroboron and aluminum are smelted in an electric furnace so as to form the wear-resistant high-chromium cast iron. The molten wear-resistant high-chromium cast iron comprises the following chemical components in percentage by mass: 3.0-3.5% of C, 18-25% of Cr, 0.3-0.5% of Mn, 0.3-0.5% of Si, 0.18-0.25% of N, 0.5-0.8% of Mo, 0.2-0.4% of B, 0.08-0.12% of Al, 0.5-1.0% of Cu, less than 0.05% of S, less than 0.05% P and the balance of Fe. Molten iron is treated with an inoculator when taken out from the electric furnace, and is treated with a suspending agent when poured, so as to obtain fine solidification structures. Therefore, the wear-resistant high-chromium cast iron has excellent properties.

Description

A kind of antiwear high-chromium cast iron preparation method
Technical field
The present invention is a kind of rich chromium cast iron preparation method, and particularly one adopts Suspension Foundry and current-following inoculation process abrasion-resistant cast rich chromium cast iron method, belongs to technical field of metal.
Background technology
High-chromium white cast iron is described as the most excellent contemporary abrasive wear resistant weld deposit material, along with the development of producing, by chromium content span of control, usually adopts Cr15, Cr20, Cr25 tri-series.For satisfied different working condition requirement, except adjustment carbon content, be also aided with other alloying element, as nickel, tungsten, molybdenum etc., form Multiple alloying high-chromium cast iron.In order to improve rich chromium cast iron performance, Chinese invention patent CN102220541A discloses a kind of rich chromium cast iron containing SiC powder, the preparation method of this cast iron and the method with this kind of cast iron materials manufacture wear resistance castings, the technical scheme adopted is: a kind of rich chromium cast iron containing SiC powder, it is characterized in that: described SiC powder is 99.9%SiC, mean particle size is 20-40 nanometer, SiC powder accounts for the 3-6% of described rich chromium cast iron gross weight, described rich chromium cast iron also comprises 3.1-3.9%C, 18-22%Cr, 0.5-1.0%Si, 0.6-1.6%Mo, 0.6-1.2%Mn, 0.1-0.4%Ni, 0.04-0.09%V, 0.011-0.031%S, 0.018-0.030%P.Beneficial effect is: 1) SiC powder improves the wear resistance of foundry goods greatly.2) utilize SiC powder to strengthen high chromium cast iron material, the wear-resisting shot blasting device blades of rich chromium cast iron of resistance to HI high impact frictional wear can be formed.Therefore, utilize SiC nano-powder both can change rich chromium cast iron crystal growth pattern, change martensitic growthhabit, greatly improve the hardness of material; The friction and wear behavior under material at high temperature can be improved again, obviously play the effect of opposing high temperature friction and wear.Chinese invention patent CN101012526 also discloses a kind of rare earth multicomponent micro-alloying high-chromium cast iron and uses thereof.The wear resistance and the work-ing life that it solve current domestic extrusion roll steel are undesirable, need of production can not be met, and the problems such as import equipment high cost, have and significantly improve in higher thermohardening, hot strength, thermal fatigue strength, wear resistance and work-ing life, the advantages such as machining property is good, can meet the needs of extrusion roll.The chemical composition of this cast iron contains by weight, carbon 1.0-3.5 part, chromium 8.0-26.0 part, nickel 0.5-4.5 part, molybdenum 0.15-2.0 part, copper 0.5-2.0 part, aluminium 0.05-2.0 part, vanadium 0.03-0.3 part, rare earth 0.005-0.20 part, silicon≤0.5 part, manganese≤0.7 part, sulphur≤0.05 part, phosphorus≤0.05 part, surplus is iron.Chinese invention patent CN102212740A also discloses containing VN, TiN powder rich chromium cast iron, this cast iron preparation method and wearing piece, the technical scheme adopted is: a kind of containing VN, TiN powder rich chromium cast iron, it is characterized in that: described VN, TiN powder to be purity be 99.5% VN and purity be the TiN of 99.3%, described powder accounts for the TiN that rich chromium cast iron weight percentage is VN and 2-4% of 2-4%, described rich chromium cast iron also comprises 3.1-3.9%C, 18-22%Cr, 0.5-1.0%Si, 0.6-1.6%Mo, 0.6-1.2%Mn, 0.1-0.4%Ni, 0.04-0.09%V, 0.011-0.031%S, 0.018-0.030%P, surplus is the body material of iron.Beneficial effect is: this beneficial effect of the invention is: VN and TiN powder can be used as the forming core core that rich chromium cast iron molten metal matrix and carbide solidify, and greatly improves the wear resistance of foundry goods; Utilize VN and TiN powder to strengthen high chromium cast iron material, the wear-resisting shot blasting device blades of resistance to HI high impact frictional wear rich chromium cast iron can be formed; VN and TiN powder adopts addition method in stove, and the nano particle added on the one hand serves strengthening effect, and what add in stove on the other hand is argon gas, protects molten metal.Chinese invention patent CN1769508 also discloses a kind of hypereutectic high chromium cast iron and manufacture method thereof, the main component of hypereutectic high chromium cast iron is: C:3.5 ~ 4.5%, Mn:1.0 ~ 3.0%, Cr:17 ~ 30%, Si:0.5 ~ 1.5%, Cu:1.0 ~ 2.0%, P :≤0.06%, S :≤0.06%, Ni :≤1%, surplus is iron.Its preparation method is the method refinement primary carbide adopting late inoculation Metamorphism treatment, and the particles such as TiN, NbN that in bag, the master alloy of nucleating agent contains, as the matrix promoting primary carbide forming core, increase the number of nuclei of primary carbide.Rare earth, magnesium and potassium etc. are enriched in the surface of primary carbide, make its refinement, group's nodularization.Solidifying of alloy is greatly accelerated in the effect of random inoculant, makes primary carbide have little time to grow up, thus reaches the object of refinement primary carbide.With the Wet Parts of slurry pump that hypereutectic high chromium cast iron manufactures, production technique is easy, cost is low, and castibility is good, has excellent wear resistance and high work-ing life.Chinese invention patent CN101173340 also discloses a kind of as cast condition high carbon and high chromium cast iron and preparation method thereof, and high carbon and high chromium cast iron chemical composition is (% by weight): 4.5-5.5C, 22.5-30.8Cr, 3.0-5.0V, 0.7-1.2Mn, 0.2-0.5Nb, 0.5-1.0Ti, 0.08-0.20Mg, 0.05-0.20Na, 0.05-0.20RE, Si < 1.0, all the other are Fe and inevitable trace impurity, and 5.0≤chromium carbon ratio (Cr/C)≤5.6.This invention as cast condition high carbon and high chromium cast iron can be produced by electric furnace, and cast iron tapping temperature 1440-1480 DEG C, breeds with vanadium iron particle when coming out of the stove, and carries out compound modification treatment with magnesium-rare earth and sodium salt, and molten iron pouring temperature is 1350-1380 DEG C.Can directly use after this invention high carbon and high chromium cast iron carries out stress relief annealing process at 200-280 DEG C, do not need high-temperature heat treatment, energy consumption is low, with short production cycle, and good casting property, also there is high rigidity and excellent wear resistance.Chinese invention patent CN101580913 also discloses high-chromium cast iron composite inoculant and its preparation method and application and relates to cast iron alloy containing chromium, this high-chromium cast iron composite inoculant is a kind of high-chromium cast iron composite inoculant of nanocrystalline rare earth ferrosilicon+ferro-boron, be made up of Fe-Ce-Si-Ca master alloy and Fe-B master alloy, its weight ratio is Fe-Ce-Si-Ca master alloy: Fe-B master alloy=1:0.07 ~ 0.13, the nanocrystalline crystal grain of this nucleating agent is less than 100nm, be the laminar nucleating agent that raw material carries out melt-spun process and obtains by being purchased rare earth ferrosilicon+be purchased ferro-boron, with it, crystal grain and structure refinement process are carried out to the high-chromium cast iron alloy tissue of engineering machinery rich chromium cast iron wearing piece, treatment process is metal melting casting, overcome the casting flaw of existing high-chromium cast iron alloy foundry engieering, matrix grain and cementite are able to remarkable refinement mutually, thus significantly enhance the comprehensive mechanical property of high-chromium cast iron alloy.Chinese invention patent CN101503013 also discloses a kind of high-chromium cast iron composite wear-resistant material and is made up of basic unit, transition layer, wearing layer, and described basic unit is soft steel; Transition layer is copper alloy; Wearing layer is rich chromium cast iron, and its production technique is: the basic unit that sectional area is identical, thickness is different successively, transition layer, wearing layer are stacked and placed in special atmosphere oven and are heated to 1100 ~ 1300 DEG C, insulation, and controlled cooling model to 100 DEG C is come out of the stove; Then gained material is heated to 800 ~ 1050 DEG C, low-temperaturetempering after quenching.This invention production technique is simple, reasonable in design, by different layer thickness combination and High temperature diffusion, the thermal treatment process process accordingly of high hard formation, transition layer, high-ductility layer, realize the combination of high-abrasive material high rigidity, good wear resistance and toughness, the industries such as mine, cement, brickmaking, electric power, metallurgy can be widely used in, be applicable to the wear-resisting requirement under various bad working environments condition.Chinese invention patent CN101892417A also discloses the hypereutectic high chromium cast iron that a kind of as cast condition uses, the chemical composition of the hypereutectic high chromium cast iron that this as cast condition uses is by weight percentage: C:3.5 ~ 4.5%, Mn:1.0 ~ 3.0%, Cr:16.0 ~ 28.0%, Si:0.5 ~ 1.5%, Ti:2.1 ~ 3.0%, P :≤0.06%, S :≤0.06%, surplus is iron.The hypereutectic high chromium cast iron tapping temperature 1500 ~ 1650 DEG C that this as cast condition uses, teeming temperature 1350 ~ 1400 DEG C, the content of noble metal is few, directly use in as cast condition, energy consumption is low, with short production cycle, and good casting property, also there is higher hardness and excellent wear resistance.But current succeeded in developing various high-chromium abrasion-proof cast iron ubiquity fragility are large, and expensive alloying elements add-on is many, the high deficiency of production cost.
Summary of the invention
The object of the invention is to smelt in later stage and casting process at rich chromium cast iron, add nucleating agent and suspension agent, reach and improve rich chromium cast iron tissue, improve the object of its performance.
Object of the present invention can be realized by following processing step:
(1) ordinary scrap steel, carburelant, ferrochrome, molybdenum-iron, copper coin, nitrided ferro-chromium, ferrosilicon, ferromanganese, ferro-boron and metallic aluminium melting antiwear high-chromium cast iron in electric furnace is adopted, the chemical constitution of antiwear high-chromium cast iron molten iron and massfraction are controlled: 3.0 ~ 3.5%C, 18 ~ 25%Cr, 0.3 ~ 0.5%Mn, 0.3 ~ 0.5%Si, 0.18 ~ 0.25%N, 0.5 ~ 0.8%Mo, 0.2 ~ 0.4%B, 0.08 ~ 0.12%Al, 0.5 ~ 1.0%Cu, S<0.05%, P<0.05%, surplus is Fe.Come out of the stove when molten iron temperature rises to 1530 ~ 1560 DEG C;
(2) when molten iron is come out of the stove, add account for molten steel quality mark 1.5 ~ 2.5% master alloy as nucleating agent, current-following inoculation process molten iron, molten iron through leave standstill and after taking off Slag treatment, when temperature is 1400 ~ 1430 DEG C, directly pour into casting mold, in molten steel pouring course, with molten iron add account for molten steel quality mark 0.8 ~ 1.5% iron alloy ball as suspension agent;
(3) foundry goods carries out Quench and temper process after sand removal and grinding process, quenching temperature 950 ~ 1000 DEG C, soaking time 2 ~ 4h, and the type of cooling adopts air-cooled, tempering temperature 230 ~ 260 DEG C, soaking time 8 ~ 12h, air cooling after tempering.
Wherein said iron alloy ball is for being 2.5 ~ 3.0%C by massfraction, 0.3 ~ 0.5%Bi, 0.8 ~ 1.0%B, 0.6 ~ 1.0%Mn, 1.5 ~ 3.0%Si, P<0.05%, S<0.05%, the iron alloy of surplus Fe is broken into the iron alloy ball that granularity is 0.5 ~ 1.0mm, master alloy is for being 2.0 ~ 2.5%C by massfraction, 3 ~ 5%Ca, 3 ~ 5%Ba, 2.5 ~ 5.0%Ti, 12.0 ~ 15.0%Si, 0.5 ~ 1.0%Mn, P<0.04%, S<0.04%, the master alloy of Fe surplus is crushed to the fritter that granularity is 2 ~ 5mm, then after iron alloy ball and master alloy dry 3 ~ 4h through 200 ~ 250 DEG C, be respectively used to Suspension Foundry and inoculation.
The present invention is when molten iron is come out of the stove, add account for molten steel quality mark 1.5 ~ 2.5% master alloy as nucleating agent, current-following inoculation process molten iron, and the chemical constitution of master alloy and massfraction are: 2.0 ~ 2.5%C, 3 ~ 5%Ca, 3 ~ 5%Ba, 2.5 ~ 5.0%Ti, 12.0 ~ 15.0%Si, 0.5 ~ 1.0%Mn, P<0.04%, S<0.04%, Fe surplus.After nucleating agent adds molten iron, can increase and solidify core, refinement rich chromium cast iron microstructure.In addition, adding of nucleating agent can reduce the amount of inclusions in molten iron, and improves inclusion morphology and distribution, is conducive to improving rich chromium cast iron mechanical property, particularly promotes the raising of rich chromium cast iron obdurability.
In addition, the present invention is in casting process, add account for molten steel quality mark 0.8 ~ 1.5% iron alloy ball as suspension agent, chemical constitution and the massfraction of iron alloy ball are: 2.5 ~ 3.0%C, 0.3 ~ 0.5%Bi, 0.8 ~ 1.0%B, 0.6 ~ 1.0%Mn, 1.5 ~ 3.0%Si, P<0.05%, S<0.05%, surplus Fe.After suspension agent adds molten iron, can thinning solidification structure further, improve rich chromium cast iron mechanical property and wear resistance.Fig. 1 is abrasion-resistant cast rich chromium cast iron suspension treatment process schematic diagram.
Effect of the present invention:
1) not nickeliferous in antiwear high-chromium cast iron of the present invention, the expensive alloy element such as vanadium, niobium, has lower production cost.
2) antiwear high-chromium cast iron of the present invention is because adopting inoculation and suspension pouring, and solidified structure is tiny, and mechanical property is good, and wherein macrohardness reaches 63 ~ 65HRC, and bending strength reaches 1850 ~ 1960MPa, and impelling strength reaches 10J/cm 2above.
3) in antiwear high-chromium cast iron microstructure of the present invention, the high rigidity M containing volume fraction 35 ~ 40% 7c 3type carbide, has excellent wear resistance, and under identical wearing and tearing (ML-10 pin on disk test) condition, the wear resistance of antiwear high-chromium cast iron of the present invention improves more than 30% than Cr15Mo3 rich chromium cast iron.Both production costs are suitable.
Accompanying drawing explanation
Fig. 1 abrasion-resistant cast rich chromium cast iron suspension treatment process schematic diagram;
1-sprue cup, 2-loading hopper, 3-liquid collecting bag, 4-sprue, 5-die cavity.
Embodiment
The invention will be further described for the embodiment provided below in conjunction with accompanying drawing and contriver, but the present invention is not limited to following examples.Fig. 1 is shown in by abrasion-resistant cast rich chromium cast iron suspension treatment process schematic diagram, and die cavity 5 is provided with the sprue 4 communicated, and sprue 4 is provided with the liquid collecting bag 3 communicated, and liquid collecting bag 3 is directly connected with loading hopper 2, and the bag of liquid collecting simultaneously 3 is also connected with sprue cup.
Embodiment 1:
Abrasion-resistant cast rich chromium cast iron of the present invention 250 kilograms of medium-frequency induction furnace meltings, its manufacturing technology steps is:
(1) be 2.53%C by massfraction, 0.48%Bi, 0.81%B, 0.65%Mn, 1.51%Si, 0.039%P, the iron alloy of 0.033%S, surplus Fe is broken into the iron alloy ball that granularity is 0.5 ~ 1.0mm, is 2.01%C by massfraction, 3.12%Ca, 4.85%Ba, 2.62%Ti, 12.07%Si, 0.51%Mn, the master alloy of 0.036%P, 0.021%S, Fe surplus is crushed to the fritter that granularity is 2 ~ 5mm, after iron alloy ball and master alloy dry 4h through 200 DEG C, be respectively used to Suspension Foundry and inoculation.
(2) adopt ordinary scrap steel, carburelant, ferrochrome, molybdenum-iron, copper coin, nitrided ferro-chromium, ferrosilicon, ferromanganese, ferro-boron and metallic aluminium melting antiwear high-chromium cast iron in electric furnace, the chemical constitution of antiwear high-chromium cast iron molten iron and massfraction are controlled: 3.03%C, 18.17%Cr, 0.49%Mn, 0.32%Si, 0.19%N, 0.77%Mo, 0.39%B, 0.09%Al, 0.50%Cu, 0.038%S, 0.044%P, surplus is Fe.Come out of the stove when molten iron temperature rises to 1532 DEG C.
(3) when molten iron is come out of the stove, add account for molten steel quality mark 1.5% master alloy as nucleating agent, current-following inoculation process molten iron, molten iron through leave standstill and after taking off Slag treatment, when temperature is 1405 DEG C, directly from sprue cup 1, pour into casting mold.In molten steel pouring course, add from loading hopper 2 account for molten steel quality mark 1.5% iron alloy ball as suspension agent, molten iron and suspension agent react in liquid collecting bag 3, then inject die cavity 5 through sprue 4.
(4) foundry goods carries out Quench and temper process after sand removal and grinding process, quenching temperature 950 DEG C, soaking time 4h, and the type of cooling adopts air-cooled, tempering temperature 260 DEG C, soaking time 8h, air cooling after tempering.
Antiwear high-chromium cast iron performance is in table 1.
Embodiment 2:
Abrasion-resistant cast rich chromium cast iron of the present invention 250 kilograms of medium-frequency induction furnace meltings, its manufacturing technology steps is:
(1) be 2.99%C by massfraction respectively, 0.33%Bi, 0.98%B, 0.97%Mn, 2.90%Si, 0.036%P, the iron alloy of 0.038%S, surplus Fe is crushed to the iron alloy ball of granularity 0.5 ~ 1.0mm, is 2.48%C by massfraction, 4.92%Ca, 3.01%Ba, 4.80%Ti, 14.99%Si, 0.98%Mn, the master alloy of 0.033%P, 0.017%S, Fe surplus is crushed to the fritter that granularity is 2 ~ 5mm, after iron alloy ball and master alloy dry 3h through 250 DEG C, be respectively used to Suspension Foundry and inoculation.
(2) adopt ordinary scrap steel, carburelant, ferrochrome, molybdenum-iron, copper coin, nitrided ferro-chromium, ferrosilicon, ferromanganese, ferro-boron and metallic aluminium melting antiwear high-chromium cast iron in electric furnace, the chemical constitution of antiwear high-chromium cast iron molten iron and massfraction are controlled: 3.49%C, 24.88%Cr, 0.31%Mn, 0.48%Si, 0.25%N, 0.51%Mo, 0.22%B, 0.11%Al, 0.97%Cu, 0.040%S, 0.043%P, surplus is Fe.Come out of the stove when molten iron temperature rises to 1559 DEG C.
(3) when molten iron is come out of the stove, add account for molten steel quality mark 2.5% master alloy as nucleating agent, current-following inoculation process molten iron, molten iron through leave standstill and after taking off Slag treatment, when temperature is 1428 DEG C, directly from sprue cup 1, pour into casting mold.In molten steel pouring course, add from loading hopper 2 account for molten steel quality mark 0.8% iron alloy ball as suspension agent, molten iron and suspension agent react in liquid collecting bag 3, then inject die cavity 5 through sprue 4.
(4) foundry goods carries out Quench and temper process after sand removal and grinding process, quenching temperature 980 DEG C, soaking time 3h, and the type of cooling adopts air-cooled, tempering temperature 240 DEG C, soaking time 10h, air cooling after tempering.Antiwear high-chromium cast iron performance is in table 1.
Embodiment 3:
Abrasion-resistant cast rich chromium cast iron of the present invention 250 kilograms of medium-frequency induction furnace meltings, its manufacturing technology steps is:
(1) be 2.82%C by massfraction respectively, 0.43%Bi, 0.91%B, 0.73%Mn, 2.36%Si, 0.041%P, the iron alloy of 0.035%S, surplus Fe is crushed to the iron alloy ball of granularity 0.5 ~ 1.0mm, is 2.33%C by massfraction, 4.14%Ca, 3.78%Ba, 3.95%Ti, 14.02%Si, 0.83%Mn, the master alloy of 0.038%P, 0.022%S, Fe surplus is crushed to the fritter that granularity is 2 ~ 5mm, after iron alloy ball and master alloy dry 4h through 230 DEG C, be respectively used to Suspension Foundry and inoculation.
(2) adopt ordinary scrap steel, carburelant, ferrochrome, molybdenum-iron, copper coin, nitrided ferro-chromium, ferrosilicon, ferromanganese, ferro-boron and metallic aluminium melting antiwear high-chromium cast iron in electric furnace, the chemical constitution of antiwear high-chromium cast iron molten iron and massfraction are controlled: 3.30%C, 23.05%Cr, 0.42%Mn, 0.39%Si, 0.21%N, 0.65%Mo, 0.28%B, 0.09%Al, 0.74%Cu, 0.037%S, 0.040%P, surplus is Fe.Come out of the stove when molten iron temperature rises to 1546 DEG C.
(3) when molten iron is come out of the stove, add account for molten steel quality mark 2.0% master alloy as nucleating agent, current-following inoculation process molten iron, molten iron through leave standstill and after taking off Slag treatment, when temperature is 1415 DEG C, directly from sprue cup 1, pour into casting mold.In molten steel pouring course, add from loading hopper 2 account for molten steel quality mark 1.2% iron alloy ball as suspension agent, molten iron and suspension agent react in liquid collecting bag 3, then inject die cavity 5 through sprue 4.
(4) foundry goods carries out Quench and temper process after sand removal and grinding process, quenching temperature 1000 DEG C, soaking time 2h, and the type of cooling adopts air-cooled, tempering temperature 230 DEG C, soaking time 12h, air cooling after tempering.Antiwear high-chromium cast iron performance is in table 1.
Table 1 antiwear high-chromium cast iron performance
Mechanical property Macrohardness/HRC Bending strength/MPa Impelling strength/J.cm -2
Embodiment 1 63.4 1935 10.9
Embodiment 2 64.0 1905 10.5
Embodiment 3 64.5 1870 10.6
Antiwear high-chromium cast iron of the present invention is because adopting inoculation and suspension pouring, and solidified structure is tiny, and mechanical property is good, and wherein macrohardness reaches 63 ~ 65HRC, and bending strength reaches 1850 ~ 1960MPa, and impelling strength reaches 10J/cm 2above.In antiwear high-chromium cast iron microstructure of the present invention, the high rigidity M containing volume fraction 35 ~ 40% 7c 3type carbide, there is excellent wear resistance, (ML-10 two body pin on disk test under identical abrasive conditions, during wearing and tearing with No. 120 quartz water sand paper and sample to mill, Wear specimens size φ 6mm × 25mm, mill journey 10.409m, load is 7.84N), the wear resistance of antiwear high-chromium cast iron of the present invention improves more than 30% than Cr15Mo3 rich chromium cast iron, and both production costs are suitable.Antiwear high-chromium cast iron of the present invention has good popularizing application prospect in wear-resisting field.

Claims (2)

1. an antiwear high-chromium cast iron preparation method, is characterized in that, comprises the following steps:
(1) ordinary scrap steel, carburelant, ferrochrome, molybdenum-iron, copper coin, nitrided ferro-chromium, ferrosilicon, ferromanganese, ferro-boron and metallic aluminium melting antiwear high-chromium cast iron in electric furnace is adopted, the chemical constitution of antiwear high-chromium cast iron molten iron and massfraction are controlled: 3.0 ~ 3.5%C, 18 ~ 25%Cr, 0.3 ~ 0.5%Mn, 0.3 ~ 0.5%Si, 0.18 ~ 0.25%N, 0.5 ~ 0.8%Mo, 0.2 ~ 0.4%B, 0.08 ~ 0.12%Al, 0.5 ~ 1.0%Cu, S<0.05%, P<0.05%, surplus is Fe; Come out of the stove when molten iron temperature rises to 1530 ~ 1560 DEG C;
(2) when molten iron is come out of the stove, add account for molten steel quality mark 1.5 ~ 2.5% master alloy as nucleating agent, current-following inoculation process molten iron, molten iron through leave standstill and after taking off Slag treatment, when temperature is 1400 ~ 1430 DEG C, directly pour into casting mold, in molten steel pouring course, with molten iron add account for molten steel quality mark 0.8 ~ 1.5% iron alloy ball as suspension agent;
(3) foundry goods carries out Quench and temper process after sand removal and grinding process, quenching temperature 950 ~ 1000 DEG C, soaking time 2 ~ 4h, and the type of cooling adopts air-cooled, tempering temperature 230 ~ 260 DEG C, soaking time 8 ~ 12h, air cooling after tempering;
Wherein said iron alloy ball is for being 2.5 ~ 3.0%C by massfraction, 0.3 ~ 0.5%Bi, 0.8 ~ 1.0%B, 0.6 ~ 1.0%Mn, 1.5 ~ 3.0%Si, P<0.05%, S<0.05%, the iron alloy of surplus Fe is broken into the iron alloy ball that granularity is 0.5 ~ 1.0mm, master alloy is for being 2.0 ~ 2.5%C by massfraction, 3 ~ 5%Ca, 3 ~ 5%Ba, 2.5 ~ 5.0%Ti, 12.0 ~ 15.0%Si, 0.5 ~ 1.0%Mn, P<0.04%, S<0.04%, the master alloy of Fe surplus is crushed to the fritter that granularity is 2 ~ 5mm, then iron alloy ball and master alloy dry 3 ~ 4h through 200 ~ 250 DEG C.
2. according to a kind of antiwear high-chromium cast iron that the method for claim 1 prepares.
CN201310367339.0A 2013-08-21 2013-08-21 Preparation method of wear-resistant high-chromium cast iron CN103436773B (en)

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