CN103817312B - A kind of wear-resisting composite liner and preparation method thereof - Google Patents
A kind of wear-resisting composite liner and preparation method thereof Download PDFInfo
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- CN103817312B CN103817312B CN201410050010.6A CN201410050010A CN103817312B CN 103817312 B CN103817312 B CN 103817312B CN 201410050010 A CN201410050010 A CN 201410050010A CN 103817312 B CN103817312 B CN 103817312B
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Abstract
The present invention is a kind of wear-resisting composite liner and preparation method thereof.Wear-resisting composite liner is formed by working lining antiwear high-chromium cast iron and inoperative layer low-alloy high-strength toughness cast steel adding liquid-liquid composite casting.Wherein the chemical composition of working lining is: 2.1 ~ 2.4% C, 18.0 ~ 20.0% Cr, 0.7 ~ 1.0% B, 0.25 ~ 0.40% V, 0.15 ~ 0.28% N, 0.05 ~ 0.15% RE, 0.5 ~ 0.8% Cu, 0.05 ~ 0.12% Zn, 0.02 ~ 0.06% Nb, 0.15 ~ 0.22% Al, 0.05 ~ 0.11% Bi, 0.06 ~ 0.12% Mg, 0.10 ~ 0.22% Ti, 0.5 ~ 0.8% Mn, 1.8 ~ 2.2% Si, <0.04% S, <0.05% P, surplus Fe; The chemical composition of inoperative layer is: 0.25 ~ 0.35% C, 0.17 ~ 0.45% Si, 1.28 ~ 1.60% Mn, 0.20 ~ 0.45% Cr, 0.03 ~ 0.07% N, 0.05 ~ 0.10% Ti, 0.04 ~ 0.08% Ce, 0.03 ~ 0.08% Ca, 0.04 ~ 0.09% Al, <0.035% S, <0.040% P, surplus Fe.Wear-resisting composite liner working lining hardness is high, and wearability is good, safe and reliable.
Description
Technical field
The present invention relates to technical field of metal, specifically a kind of wear-resisting composite liner and preparation method thereof.
Background technology
For enhancing productivity, mine, the main milling apparatus-ball mill of building materials industry just keep the large-scale development, and after ball mill maximizes, the liner plate of its cylindrical shell claimed should have higher wearability, has higher toughness again, to adapt to the impulsive force of abrading-ball.In order to improve the performance of liner plate, Chinese invention patent CN1091476 discloses the manufacture method of hard boron alloy and liner plate grinding ball thereof.Take pig iron containing boron as raw material, the alloying element such as boracic, molybdenum of development, as cast condition adopts forces cooling and annealing treating process, the manufacture of the milling equipment hard boron alloy of being on active service under being suitable for non-heavy impact operating mode and liner plate thereof, abrading-ball.There is hardness HRC>52, bending strength σ
bb>550MPa, the feature such as do not distort, not broken, cost is low, and wear resistence is better than high manganese steel lining plate 1.2-1.5 doubly (mill iron ore), and 1.4-1.7 doubly (mill cement).Chinese invention patent CN1109106 also discloses a kind of bainite nodular cast iron lining plate for ball mill, and the composition of this invention liner plate is: C3.4 ~ 3.8%, Si2.5 ~ 3.5%, Mn1.5 ~ 2.5%, P≤0.1%, S≤0.03%, Mg0.03 ~ 0.08%, Re0.02 ~ 0.07%, remaining is Fe.This invention liner plate by following Technology for Heating Processing to obtain the tissue of bainite.Then 820-920 DEG C of insulation 2-8 hour be 9-14 in pH value, and proportion is quench in sodium salt within the scope of 1.0-1.8 or the sylvite aqueous solution.Better, long service life, cost are low for this liner plate wearability and impact flexibility combination property.Chinese invention patent CN101173343 also discloses a kind of high-strength abrasion-proof cast steel lining board and manufacture method thereof, its chemical composition of liner plate is (% by weight): 0.25-0.45C, 1.0-1.8Si, 1.0-2.0Mn, 0.8-1.5Cr, 0.003-0.008B, 0.02-0.08Al, 0.04-0.15Ti, 0.02-0.10La, 0.02-0.10Ce, 0.02-0.08Ba, 0.02-0.10Ca, all the other are Fe and inevitable trace impurity, wherein 3.5 < Si+Mn+Cr < 4.5, 0.05 < La+Ce < 0.18.This invention liner plate utilizes electric furnace just can produce, and adopt sand casting, liner plate tensile strength is high, reaches 1450-1600MPa, and hardness reaches 50-55HRC, and have good wearability, impact flexibility reaches 65-80J/cm
2, do not rupture in using, do not peel off, serviceability is obviously better than Mn13 high manganese steel lining plate, and production technology is simple, and be primary raw material with steel cuttings, thus production cost is low.Use this invention liner plate can improve ball mill operating rate, reduce material grinding cost, there is good economic benefit.Chinese invention patent CN101209431 also discloses a kind of lining board for ball mill barrel, comprises liner plate working face and liner plate stationary plane, liner plate stationary plane be one can be suitable with cylinder inner surface curved surface, extend to form wavy surface along liner plate working face is bending, along the liner plate cross sectional shape paralleled with the waveform bearing of trend of wavy surface roughly in trapezoidal, this wavy surface comprises waveform original position and waveform final position, the extreme higher position in the close liner plate cross section paralleled with waveform bearing of trend of original position of waveform, waveform final position near parallel with waveform bearing of trend the extreme lower position in liner plate cross section, the original position of waveform is the starting point of a trough curved surface, the final position of waveform is the terminating point of a crest curved surface, between the starting point and the terminating point of crest curved surface of trough curved surface, at least there are two crest curved surfaces.It has long service life, operating efficiency advantages of higher.Chinese invention patent CN1843656 also discloses a kind of process for manufacturing rare earth high-carbon low-alloy steel liner, comprises formative technology, smelting process and Technology for Heating Processing; Formative technology comprises greensand mold formative technology and EPC lost foam modeling technique, and greensand mold technique facing sand material adopts 40-100 order artificial stone sand, and silicon content is not less than 98%, floor sand adopts river sand, material proportioning: quartz sand: 100%, bentonite: 7-8%, water: 4-6%; Divide sand loading, ramming, venting hole, molding, apotype mould assembling; EPC lost foam modeling technique adopts quartz sand, one dimension shake table vibration molding; Smelting process adopts acid lining, double slag process; Liner plate is heated to 600-650 DEG C of insulation 1-2 hour by Technology for Heating Processing, then is heated to 900-960 DEG C of insulation 2-3 hour, and water-cooled is to 380-420 DEG C afterwards, and air cooling is to room temperature.Then 200-400 DEG C of insulation 3-5 hour is heated to, air cooling.The ball grinding machine lining board wearability of producing by this invented technology method is strong, and can not produce plastic deformation, not easy fracture, cost is low, simple installation.Chinese invention patent CN1923372 also discloses a kind of manufacturing process of the composite abrasion-proof inner plate for ball mill, concrete steps are as follows: draw nanostructured metal silk, process wire, determine to tighten size of outer tube, fixing metal silk, cutting multiple tube, processing liner plate framework, welding Luo Shuantao, place multiple tube, paperbacked welding, namely processing and manufacturing becomes the composite abrasion-proof inner plate that liner plate framework and multiple tube and dividing plate are combined closely.The advantage of this invention is: this invention has given full play to high tenacity, high strength, the various advantage such as high abrasion and low price of nano structure metal materials, solve the problem that common alloy lining will consume a large amount of non-ferrous metal, and service life improves an order of magnitude than common material liner plate.Chinese invention patent CN1932066 also discloses Heavy-alloyed ball mill lining board steel of low carbon and its preparation method, it is characterized in that described liner steel alloying component is by weight percentage: C:0.15 ~ 0.30%, Cr:5.0 ~ 10.0%, Ni:0 ~ 1.5%, Mn:0.5 ~ 1.7%, Mo:0 ~ 1.5%, RE:0 ~ 0.8%, Ti:0 ~ 1.0%, Si:0 ~ 1.6%, P:0.01 ~ 0.045%, S:0.01 ~ 0.045%; Other metals and nonmetalloid total amount are no more than 3%; Surplus is Fe.This invention tool under the working environment of wet-grinding machine liner plate has good wearability, and its life-span is the twice of high manganese steel lining plate, low cost.Chinese invention patent CN101045972 also discloses a kind of wear-resistant bainite cast steel liner plate and manufacture method thereof.The composition quality ratio (wt.%) of this cast steel liner plate is: C:0.45 ~ 0.55%; Si:1.6 ~ 2.0%; Mn:2.8 ~ 3.3%; P≤0.06%; S≤0.04%; Remaining is Fe.Its manufacture method utilizes medium-frequency induction furnace melting to prepare cast steel liner plate in conjunction with vacuum-evaporative pattern casting technique; Then controlled cooling model Technology for Heating Processing is adopted to heat-treat to obtain bainite heterogeneous structure to liner plate; Finally carry out lonneal.Prepared liner plate tissue is mainly acicular bainite and martensite and retained austenite on a small quantity, the hardness number of liner plate in HRC53 ~ 55, impact flexibility α
kvalue is at 22 ~ 27J/cm
2, there is extraordinary combination of strength and toughness and combination property.On metal mine, cement mill, Commercial application shows that the life-span of wear-resistant bainite cast steel liner plate prepared by this invention is 1.5 ~ 2.0 times of former high manganese steel lining plate.Chinese invention patent CN101054652 also discloses a kind of ball grinding machine lining board chemical composition (percentage by weight): C 0.6-0.8%, Si 0.3-0.8%, Mn 0.3-0.8%, Cr 2.0-4.5%, Ni 0.2-2.0%, Mo 0.1-0.8 %, S < 0.04%, P < 0.04%, surplus are Fe.Its manufacturing process is: ball grinding machine lining board is heated to 860-960 DEG C, insulation 2-3 hour, then quench in water and cool, its temperature is declined fast, when workpiece surface temperature drops to 580-680 DEG C, take out from water, then at the air hollow cold of forced convertion to room temperature, carry out 480-520 DEG C of tempering afterwards, cooling gets product naturally.The ball grinding machine lining board of this invention has very high hardness, intensity, and quenching degree is better, and wearability is high, its Technology for Heating Processing is simple to operation, and environmental pollution is little, and deformation of products is little, its cost is only 1.5 times of potassium steel, service life be the 1.5-2.5 of potassium steel product doubly.Chinese invention patent CN102284330A also discloses a kind of composite liner plate for ball grinder and manufacture method thereof, and wherein composite liner plate for ball grinder comprises plate body, and plate body has installing hole, and plate body comprises metal back layer and is compound in the plastic layer on metal back layer.The manufacture method of composite liner plate for ball grinder, comprises the steps: that a. prepares metal back layer; B. composite plastic layer on metal back layer; C. cool.The composite liner plate for ball grinder of this invention has that intensity is high, wearability good, not easy fracture and the advantage of breaking.Chinese invention patent CN102517504A also discloses one with low price boron for main alloy element, and can manufacture the high boron wear-resisting casting steel of ball grinding machine lining board, the chemical composition of cast steel described in it and mass percent thereof are: C:< 0.4; Si:0.40-0.8; Mn:0.5-1.2; Cr:0.5-1.2; B:1.2-3.0; Re:< 0.2; V:< 0.1; Ti:< 0.1, described cast steel first carries out the quenching technical of 950-980 DEG C × 2h+ water-cooled, then in 200-250 DEG C × 4h+ air cooling temper, its hardness is greater than 58HRC, and impact flexibility is greater than 12J/cm
2, through hardening layer depth is greater than 40mm.Chinese invention patent CN102784886A also discloses a kind of ball grinding machine lining board casting method, and comprise the following steps, A selects materials: the material selecting austenite-bainite steel; B vacuum seal modeling; C vacuum-assist pouring: pour into a mould under the state vacuumizing negative pressure 0.05Mpa-0.06Mpa, cancel vacuum after cooling, knockout, cleaning; D heat treatment: adopt electronics tempering kiln, be heated to 900-950 DEG C, keep 6 hours, then come out of the stove and be placed in cooling fluid until cool, obtain foundry goods to be processed.This invention is compared, and it is wear-resisting, impact resistance good for ball grinding machine lining board that conventional cast method produces, and intensity, toughness are high, and cost is low.Chinese invention patent CN102808134A also discloses big-and-middle-sized ball mill steel alloy lining board special, its chemical composition (wt%) is: carbon 0.8% ~ 1.0%, manganese 0.4% ~ 0.9%, silicon 0.6% ~ 1.0%, chromium 6% ~ 8%, molybdenum 0.3% ~ 0.55%, nickel: 0.3% ~ 0.5%, vanadium: 0.2% ~ 0.3%, yttrium-base heavy rare earth: 0.1% ~ 0.3%, sulphur≤0.04%, phosphorus≤0.04%, all the other are iron, the inevitable impurity a small amount of with other, its production technology comprises formative technology, smelting process and Technology for Heating Processing, big-and-middle-sized ball mill steel alloy lining board special long service life, wearability is high, cost is low, be easy to dismounting.Chinese invention patent CN103266272A also discloses a kind of preparation method of cylinder lining plate of ball mill, it is characterized in that described liner steel chemical composition is by weight percentage: C:0.20 ~ 1.0%, Si:0.6 ~ 2.6%, Mn:0.15 ~ 0.65%, Cr:0.3 ~ 3.0%, Al:0.01 ~ 0.05%, Re:0.05 ~ 0.5%, P :≤0.03%, S :≤0.03%, surplus is Fe, the main feature of this invention adopts heat stepwise insulation and oil hardening technique, serve crystal grain thinning, purification crystal boundary, improve the effect of quenching degree and Microstructure and properties uniformity, make product hardness HRC>=53, impact flexibility a
k>=20J/cm
2, service life improves twice.But also there is the deficiency that wearability and obdurability are difficult to take into account in foregoing invention liner plate.
Summary of the invention
The present invention seeks to be difficult to take into account wearability and obdurability to overcome common liner plate, providing that a kind of production technology is easy, abundant raw material source, not containing bimetal wear resistant composite liner and preparation method thereof of the expensive alloying elements such as molybdenum, nickel and low production cost.
The object of the invention is achieved through the following technical solutions:
Wear-resisting composite liner adopts liquid-liquid composite casting method to be composited by working lining antiwear high-chromium cast iron and inoperative layer low-alloy high-strength toughness cast steel adding, wherein the chemical constituent of antiwear high-chromium cast iron and mass fraction thereof are: 2.1 ~ 2.4%C, 18.0 ~ 20.0%Cr, 0.7 ~ 1.0%B, 0.25 ~ 0.40%V, 0.15 ~ 0.28%N, 0.05 ~ 0.15%RE, 0.5 ~ 0.8%Cu, 0.05 ~ 0.12%Zn, 0.02 ~ 0.06%Nb, 0.15 ~ 0.22%Al, 0.05 ~ 0.11%Bi, 0.06 ~ 0.12%Mg, 0.10 ~ 0.22%Ti, 0.5 ~ 0.8%Mn, 1.8 ~ 2.2%Si, <0.04%S, <0.05%P, surplus Fe, chemical composition and the mass fraction thereof of low-alloy high-strength toughness cast steel adding are: 0.25 ~ 0.35%C, 0.17 ~ 0.45%Si, 1.28 ~ 1.60%Mn, 0.20 ~ 0.45%Cr, 0.03 ~ 0.07%N, 0.05 ~ 0.10%Ti, 0.04 ~ 0.08%Ce, 0.03 ~ 0.08%Ca, 0.04 ~ 0.09%Al, <0.035%S, <0.040%P, surplus Fe.
Working lining adopts antiwear high-chromium cast iron to improve its wearability, and its inoperative layer adopts low-alloy high-strength toughness cast steel adding, adopts liquid-liquid composite casting to form, and guarantees that liner plate does not rupture in using.
Wear-resisting composite liner preparation method carries out according to the following steps:
1. melting composite liner working lining antiwear high-chromium cast iron and inoperative layer low-alloy high-strength toughness cast steel adding in two electric furnaces respectively;
2. come out of the stove when the temperature of inoperative layer low-alloy high-strength toughness cast steel adding molten steel reaches 1620 ~ 650 DEG C, when liquid steel temperature is down to 1510 ~ 1535 DEG C, molten steel is poured into lower floor's high strength-toughness cast steel adding running gate system of casting system, after lower floor's pouring molten steel to 75 ~ 85%, immediately by sodium tetraborate together with remaining 25 ~ 15% molten steel pour into cast steel surface by lower floor's high strength-toughness cast steel adding running gate system, sodium tetraborate addition is every square area 3.5 ~ 4.0 kilograms (i.e. 3.5 ~ 4.0 kilograms/m on cast steel and atmosphere surface
2);
3., after cast steel is poured 8 ~ 25min, measure cast steel surface temperature by non-contact type thermodetector, when temperature is 1330 ~ 1390 DEG C, pour into working lining (upper strata) antiwear high-chromium cast iron molten iron, molten steel pouring temperature is 1410 ~ 1440 DEG C; Molten iron is unpacking air cooling composite liner foundry goods after being poured 4 ~ 6h, spruing, cleaning overlap, burr;
4. the composite liner foundry goods after sand removal process is heated to 1020 ~ 1050 DEG C with stove, air-cooled to temperature to 350 ~ 420 DEG C after insulation 3 ~ 5h, continue again to be heated to 480 ~ 520 DEG C into stove, after insulation 8 ~ 12h, stove is chilled to temperature lower than after 260 DEG C, come out of the stove air cooling to room temperature, wear-resisting composite liner can be obtained.
Described casting system comprises: casting mold, rising head, lower floor's high strength-toughness cast steel adding running gate system, upper strata antiwear high-chromium cast iron running gate system, upper strata antiwear high-chromium cast iron die cavity and lower floor's high strength-toughness cast steel adding die cavity, rising head, lower floor's high strength-toughness cast steel adding running gate system, upper strata antiwear high-chromium cast iron running gate system, upper strata antiwear high-chromium cast iron die cavity and lower floor's high strength-toughness cast steel adding die cavity are all located in casting mold, upper strata antiwear high-chromium cast iron running gate system is communicated with upper strata antiwear high-chromium cast iron die cavity, lower floor's high strength-toughness cast steel adding running gate system is communicated with lower floor's high strength-toughness cast steel adding die cavity, rising head is on antiwear high-chromium cast iron die cavity top, upper strata.
Casting molten metal enters upper strata antiwear high-chromium cast iron die cavity and lower floor's high strength-toughness cast steel adding die cavity via upper strata antiwear high-chromium cast iron running gate system and lower floor's high strength-toughness cast steel adding running gate system.
Composite liner working lining of the present invention selects antiwear high-chromium cast iron, mainly in order to obtain the high rigidity M of some
7c
3type eutectic carbide, thus liner plate working lining wearability can be improved.On this basis, add 0.7 ~ 1.0%B, mainly in order to obtain the boron-carbide of high rigidity and utilize boron to be solid-solution in matrix, thus the microhardness of martensitic matrix can being improved, being highly profitable to improving wearability.Add 0.25 ~ 0.40%V, the MC type carbide of high rigidity can be obtained, be conducive to improving working lining wearability.Add 0.15 ~ 0.28%N, utilize nitrogen to be solid-solution in matrix on the one hand, improve matrix quenching degree, on the other hand, utilize nitrogen and Ti, Nb etc. to combine and generate dystectic tiny nitride, crystallization nuclei effect can be played, be conducive to the obdurability improving wearing layer.Add 0.5 ~ 0.8%Cu and can improve quenching degree.Add 0.05 ~ 0.15%RE, 0.05 ~ 0.12%Zn, 0.02 ~ 0.06%Nb, 0.15 ~ 0.22%Al, 0.06 ~ 0.12%Mg, 0.10 ~ 0.22%Ti, not only can refinement matrix, can also refined carbides, and carbide is uniformly distributed, thus the obdurability of wearing layer can be significantly improved, prevent from occurring in wearing layer use procedure peeling off and ftractureing.But not working lining selects low-alloy high-strength toughness cast steel adding, can guarantee that composite liner inoperative layer has good obdurability, guarantee that liner plate can not rupture and be out of shape in using.
The performance of composite liner is determined by its material and technique.In order to improve the composite quality of composite liner, the casting sequence of two kinds of metal liquids is studied, finds in the technique of first pouring molten iron, be difficult to obtain good compound casting, show that the defect such as slag inclusion, pore very easily appears in the land of bi-material, and two kinds of molten metals easily rush mixed.Main cause has be the liquid steel temperature fusing point far above cast iron of rear cast at two: one, easily causes the large area punching of cast iron mixed; Two is oxides that Cast Iron Surface easily forms the elements such as Cr, Mn, Si, and these oxides are more stable, are difficult to be reduced in recombination process, under the washing away of molten steel, easily forms the defect such as slag inclusion and pore.In addition, the crystallization range of iron is wider than steel, and the fusing point of steel is higher than iron.The degree of superheat of molten steel is generally little than iron, and therefore the time of its liquid flowing is just short.Molten steel temperature is higher, and in casting mold, radiating rate is large, and the speed separating out dendrite is fast.After cast, decline with temperature, the solidification layer of steel constantly thickeies, and its speed reaching center is faster than iron.Therefore, in composite liner biliquid non-inductive windings casting on flat process, should first water molten steel, after water molten iron.After adopting this technique, recombination process is at high temperature, and molten iron soaks the cast steel top layer of having solidified, and the element in bi-material produces phase counterdiffusion.
The present invention compared with prior art has following characteristics:
1) composite liner working lining antiwear high-chromium cast iron of the present invention and inoperative layer low-alloy high-strength toughness cast steel adding achieve good metallurgical binding, can obtain that working lining hardness is high, wearability good, and inoperative layer obdurability is good, and composite liner bond strength is high.
2) easy, the abundant raw material source of composite liner production technology of the present invention, not containing the expensive alloying elements such as molybdenum, nickel, low production cost.
3) composite liner of the present invention has excellent wearability, and its service life improves 3 ~ 4 times than high manganese steel lining plate, and use safety, reliable.
Accompanying drawing explanation
Fig. 1 is wear-resisting composite liner casting system structural representation of the present invention.
In figure: the antiwear high-chromium cast iron running gate system of 1-upper strata, 2-casting mold, 3-upper strata antiwear high-chromium cast iron die cavity, 4-rising head, 5-lower floor high strength-toughness cast steel adding die cavity, 6-lower floor high strength-toughness cast steel adding running gate system.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further described:
Embodiment 1
:
A preparation method for wear-resisting composite liner, adopt 500 kilograms of medium-frequency induction furnaces and 1000 kilograms of medium-frequency induction furnace melting composite liner working lining antiwear high-chromium cast irons and inoperative layer low-alloy high-strength toughness cast steel adding respectively, its concrete step of preparation process is as follows:
1. melting composite liner working lining antiwear high-chromium cast iron and inoperative layer low-alloy high-strength toughness cast steel adding in two electric furnaces respectively, wherein the chemical composition of antiwear high-chromium cast iron and mass fraction thereof are: 2.11%C, 18.14%Cr, 0.98%B, 0.25%V, 0.17%N, 0.09%RE, 0.77%Cu, 0.06%Zn, 0.05%Nb, 0.16%Al, 0.10%Bi, 0.08%Mg, 0.13%Ti, 0.78%Mn, 2.19%Si, 0.018%S, 0.035%P, surplus Fe.Chemical composition and the mass fraction thereof of low-alloy high-strength toughness cast steel adding are: 0.28%C, 0.44%Si, 1.29%Mn, 0.45%Cr, 0.04%N, 0.07%Ti, 0.08%Ce, 0.03%Ca, 0.05%Al, 0.027%S, 0.032%P, surplus Fe.
2. come out of the stove when the temperature of inoperative layer low-alloy high-strength toughness cast steel adding molten steel reaches 1623 DEG C, when liquid steel temperature is down to 1515 DEG C, molten steel is poured into lower floor's high strength-toughness cast steel adding running gate system of casting system, after lower floor's pouring molten steel to 75%, immediately by sodium tetraborate together with remaining 25% molten steel pour into cast steel surface by lower floor's high strength-toughness cast steel adding running gate system, sodium tetraborate addition is every square area 3.5 kilograms (i.e. 3.5 kilograms/m on cast steel and atmosphere surface
2);
3., after cast steel is poured 12min, measure cast steel surface temperature by non-contact type thermodetector, when temperature is 1357 DEG C, pour into working lining (upper strata) antiwear high-chromium cast iron molten iron, molten steel pouring temperature is 1426 DEG C; Molten iron is unpacking air cooling composite liner foundry goods after being poured 4h, spruing, cleaning overlap, burr.
4. the composite liner foundry goods after sand removal process is heated to 1050 DEG C with stove, air-cooled to temperature to 350 DEG C after insulation 3h, then continue to be heated to 520 DEG C into stove, after insulation 8h, stove is chilled to temperature lower than after 260 DEG C, come out of the stove air cooling to room temperature, wear-resisting composite liner can be obtained.Composite liner performance is in table 1.
Embodiment 2:
A preparation method for wear-resisting composite liner, adopt 500 kilograms of medium-frequency induction furnaces and 1000 kilograms of medium-frequency induction furnace melting composite liner working lining antiwear high-chromium cast irons and inoperative layer low-alloy high-strength toughness cast steel adding respectively, its concrete step of preparation process is as follows:
1. melting composite liner working lining antiwear high-chromium cast iron and inoperative layer low-alloy high-strength toughness cast steel adding in two electric furnaces respectively, wherein the chemical composition of antiwear high-chromium cast iron and mass fraction thereof are: 2.38%C, 19.91%Cr, 0.71%B, 0.38%V, 0.27%N, 0.15%RE, 0.53%Cu, 0.11%Zn, 0.02%Nb, 0.21%Al, 0.06%Bi, 0.11%Mg, 0.12%Ti, 0.55%Mn, 1.84%Si, 0.034%S, 0.045%P, surplus Fe.Chemical composition and the mass fraction thereof of low-alloy high-strength toughness cast steel adding are: 0.34%C, 0.19%Si, 1.57%Mn, 0.23%Cr, 0.07%N, 0.05%Ti, 0.05%Ce, 0.07%Ca, 0.09%Al, 0.024%S, 0.031%P, surplus Fe.
2. come out of the stove when the temperature of inoperative layer low-alloy high-strength toughness cast steel adding molten steel reaches 1648 DEG C, when liquid steel temperature is down to 1533 DEG C, molten steel is poured into lower floor's high strength-toughness cast steel adding running gate system of casting system, after lower floor's pouring molten steel to 85%, immediately by sodium tetraborate together with remaining 15% molten steel pour into cast steel surface by lower floor's high strength-toughness cast steel adding running gate system, sodium tetraborate addition is every square area 4.0 kilograms (i.e. 4.0 kilograms/m on cast steel and atmosphere surface
2).
3., after cast steel is poured 22min, measure cast steel surface temperature by non-contact type thermodetector, when temperature is 1339 DEG C, pour into working lining (upper strata) antiwear high-chromium cast iron molten iron, molten steel pouring temperature is 1438 DEG C; Molten iron is unpacking air cooling composite liner foundry goods after being poured 6h, spruing, cleaning overlap, burr.
4. the composite liner foundry goods after sand removal process is heated to 1030 DEG C with stove, air-cooled to temperature to 380 DEG C after insulation 4h, then continue to be heated to 500 DEG C into stove, after insulation 10h, stove is chilled to temperature lower than after 260 DEG C, come out of the stove air cooling to room temperature, wear-resisting composite liner can be obtained.Composite liner performance is in table 1.
Embodiment 3:
A preparation method for wear-resisting composite liner, adopt 500 kilograms of medium-frequency induction furnaces and 1000 kilograms of medium-frequency induction furnace melting composite liner working lining antiwear high-chromium cast irons and inoperative layer low-alloy high-strength toughness cast steel adding respectively, its concrete step of preparation process is as follows:
1. melting composite liner working lining antiwear high-chromium cast iron and inoperative layer low-alloy high-strength toughness cast steel adding in two electric furnaces respectively, wherein the chemical composition of antiwear high-chromium cast iron and mass fraction thereof are: 2.25%C, 19.20%Cr, 0.84%B, 0.29%V, 0.21%N, 0.09%RE, 0.71%Cu, 0.08%Zn, 0.04%Nb, 0.19%Al, 0.09%Bi, 0.08%Mg, 0.17%Ti, 0.68%Mn, 1.91%Si, 0.030%S, 0.037%P, surplus Fe.Chemical composition and the mass fraction thereof of low-alloy high-strength toughness cast steel adding are: 0.29%C, 0.30%Si, 1.46%Mn, 0.33%Cr, 0.05%N, 0.07%Ti, 0.06%Ce, 0.05%Ca, 0.08%Al, 0.031%S, 0.038%P, surplus Fe.
2. come out of the stove when the temperature of inoperative layer low-alloy high-strength toughness cast steel adding molten steel reaches 1648 DEG C, when liquid steel temperature is down to 1524 DEG C, molten steel is poured into lower floor's high strength-toughness cast steel adding running gate system of casting system, after lower floor's pouring molten steel to 80%, immediately by sodium tetraborate together with remaining 20% molten steel pour into cast steel surface by lower floor's high strength-toughness cast steel adding running gate system, sodium tetraborate addition is every square area 3.8 kilograms (i.e. 3.8 kilograms/m on cast steel and atmosphere surface
2).
3., after cast steel is poured 16min, measure cast steel surface temperature by non-contact type thermodetector, when temperature is 1384 DEG C, pour into working lining (upper strata) antiwear high-chromium cast iron molten iron, molten steel pouring temperature is 1413 DEG C; Molten iron is unpacking air cooling composite liner foundry goods after being poured 5h, spruing, cleaning overlap, burr.
4. the composite liner foundry goods after sand removal process is heated to 1020 DEG C with stove, air-cooled to temperature to 420 DEG C after insulation 5h, then continue to be heated to 480 DEG C into stove, after insulation 12h, stove is chilled to temperature lower than after 260 DEG C, come out of the stove air cooling to room temperature, wear-resisting composite liner can be obtained.Composite liner performance is in table 1.
Casting system described in above-described embodiment is formed: comprise casting mold 2, rising head 4, lower floor's high strength-toughness cast steel adding running gate system 6, upper strata antiwear high-chromium cast iron running gate system 1, upper strata antiwear high-chromium cast iron die cavity 3 and lower floor's high strength-toughness cast steel adding die cavity 5; Rising head, lower floor's high strength-toughness cast steel adding running gate system, upper strata antiwear high-chromium cast iron running gate system, upper strata antiwear high-chromium cast iron die cavity and lower floor's high strength-toughness cast steel adding die cavity are all located in casting mold, upper strata antiwear high-chromium cast iron running gate system is communicated with upper strata antiwear high-chromium cast iron die cavity, lower floor's high strength-toughness cast steel adding running gate system is communicated with lower floor's high strength-toughness cast steel adding die cavity, rising head on antiwear high-chromium cast iron die cavity top, upper strata, as shown in Figure 1.
Casting molten metal enters upper strata antiwear high-chromium cast iron die cavity and lower floor's high strength-toughness cast steel adding die cavity via upper strata antiwear high-chromium cast iron running gate system and lower floor's high strength-toughness cast steel adding running gate system.
Table 1 composite liner mechanical property
Composite liner working lining antiwear high-chromium cast iron of the present invention and inoperative layer low-alloy high-strength toughness cast steel adding achieve good metallurgical binding, composite bed pore-free, be mingled with, the defect such as crackle, composite bed bond strength is greater than 750MPa, composite liner working lining hardness is high, be greater than 62HRC, wearability is good, inoperative layer obdurability is good, the safe handling of composite liner can be guaranteed, composite liner is for ball mills such as iron ore, phosphorus ore, cement, service life improves 3 ~ 4 times than high manganese steel lining plate, and use safety, reliable.Apply liner plate of the present invention, ball mill operating rate can be improved, alleviate labor strength, there is significant economic and social benefit.
Claims (2)
1. a wear-resisting composite liner, it is characterized in that working lining antiwear high-chromium cast iron and the inoperative layer low-alloy high-strength toughness cast steel adding of composite liner adopt liquid-liquid composite casting method to be composited, wherein the chemical composition of antiwear high-chromium cast iron and mass fraction thereof are: 2.1 ~ 2.4%C, 18.0 ~ 20.0%Cr, 0.7 ~ 1.0%B, 0.25 ~ 0.40%V, 0.15 ~ 0.28%N, 0.05 ~ 0.15%RE, 0.5 ~ 0.8%Cu, 0.05 ~ 0.12%Zn, 0.02 ~ 0.06%Nb, 0.15 ~ 0.22%Al, 0.05 ~ 0.11%Bi, 0.06 ~ 0.12%Mg, 0.10 ~ 0.22%Ti, 0.5 ~ 0.8%Mn, 1.8 ~ 2.2%Si, <0.04%S, <0.05%P, surplus Fe, chemical composition and the mass fraction thereof of low-alloy high-strength toughness cast steel adding are: 0.25 ~ 0.35%C, 0.17 ~ 0.45%Si, 1.28 ~ 1.60%Mn, 0.20 ~ 0.45%Cr, 0.03 ~ 0.07%N, 0.05 ~ 0.10%Ti, 0.04 ~ 0.08%Ce, 0.03 ~ 0.08%Ca, 0.04 ~ 0.09%Al, <0.035%S, <0.040%P, surplus Fe.
2. a preparation method for composite liner as claimed in claim 1, is characterized in that wear-resisting composite liner preparation method carries out according to the following steps:
1. melting composite liner working lining antiwear high-chromium cast iron and inoperative layer low-alloy high-strength toughness cast steel adding in two electric furnaces respectively;
2. come out of the stove when the temperature of inoperative layer low-alloy high-strength toughness cast steel adding molten steel reaches 1620 ~ 1650 DEG C, when liquid steel temperature is down to 1510 ~ 1535 DEG C, molten steel is poured into lower floor's high strength-toughness cast steel adding running gate system of casting system, after lower floor's pouring molten steel to 75 ~ 85%, immediately by sodium tetraborate together with remaining 25 ~ 15% molten steel pour into cast steel surface by lower floor's high strength-toughness cast steel adding running gate system, sodium tetraborate addition is every square area 3.5 ~ 4.0 kilograms on cast steel and atmosphere surface;
3., after cast steel is poured 8 ~ 25min, measure cast steel surface temperature by non-contact type thermodetector, when temperature is 1330 ~ 1390 DEG C, pour into upper strata working lining antiwear high-chromium cast iron molten iron, molten steel pouring temperature is 1410 ~ 1440 DEG C; Molten iron is unpacking air cooling composite liner foundry goods after being poured 4 ~ 6h, spruing, cleaning overlap, burr;
4. the composite liner foundry goods after sand removal process is heated to 1020 ~ 1050 DEG C with stove, air-cooled to temperature to 350 ~ 420 DEG C after insulation 3 ~ 5h, continue again to be heated to 480 ~ 520 DEG C into stove, after insulation 8 ~ 12h, stove is chilled to temperature lower than after 260 DEG C, come out of the stove air cooling to room temperature, wear-resisting composite liner can be obtained.
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