CN103498092B - Preparation method of wear-resistant cast steel - Google Patents

Preparation method of wear-resistant cast steel Download PDF

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CN103498092B
CN103498092B CN201310412947.9A CN201310412947A CN103498092B CN 103498092 B CN103498092 B CN 103498092B CN 201310412947 A CN201310412947 A CN 201310412947A CN 103498092 B CN103498092 B CN 103498092B
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steel
add
surplus
massfraction
chemical constitution
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CN103498092A (en
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符寒光
高义民
郑开宏
张锦红
邢建东
皇志富
马胜强
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北京工业大学
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Abstract

The invention discloses a preparation method of wear-resistant cast steel. The preparation method is characterized by comprising the steps: firstly melting multi-element alloy cast steel in an electric furnace, wherein the multi-element alloy cast steel comprises the chemical constituents in percentage by mass: 0.60-0.85% of C, 12.0-15.0% of Cr, 0.8-1.2% of Si, 0.3-0.5% of Mn, 0.8-1.2 of Mo, 1.0-1.2% of Ni, 0.15-0.22% of N, less than 0.03% of S, less than 0.04% of P, and the balance of Fe; when the molten steel temperature of the multi-element alloy cast steel reaches 1580-1600 DEG C, sequentially adding ferrosilicon, metal aluminum, ferroboron and ferrotitanium, then increasing the molten steel temperature to 1610-1630 DEG C, and discharging from the furnace, and then adding rare earth ferrosilicomagnesium, silicon-calcium-barium alloy and ferrovanadium for microalloying treatment; quenching and tempering to obtain the wear-resistant cast steel with excellent high temperature wear resistance property.

Description

The preparation method of wearable cast steel

Technical field

The invention discloses a kind of preparation method of cast steel, particularly a kind of preparation method of the high-temperature wearable cast steel containing chromium-aluminium-boron-silicon, belongs to high-abrasive material technical field.

Background technology

Wearing and tearing are ubiquitous phenomenons in industrial production, the ubiquity of wearing and tearing causes the huge consumption of material, in order to improve the wear resisting property of material, succeed in developing multiple wearable cast steel both at home and abroad, wherein Chinese invention patent CN102383066A discloses a kind of wearable cast steel, it is characterized in that, chemical composition (the massfraction of wearable cast steel, %) be: 1.60 ~ 1.80C, 3.5 ~ 4.0Ti, 1.65 ~ 1.85Si, Mn<0.8, 0.4 ~ 0.6Cu, 0.003 ~ 0.006B, 0.015 ~ 0.030Zr, 0.03 ~ 0.10Te, 0.04 ~ 0.08Ce, 0.015 ~ 0.040Mg, 0.12 ~ 0.15Al, S<0.04, P<0.05, surplus is Fe and inevitable trace impurity, and C%=0.25 × Ti%+(0.70 ~ 0.85), its preparation method adopts electrosmelting, specifically comprise the following steps: (1) is by ordinary scrap steel, the pig iron or carburelant, ferrosilicon and the fusing of copper coin Hybrid Heating, ferrotianium is added after being warming up to 1560 ~ 1580 DEG C, after stokehold adjusting component is qualified, temperature is risen to 1590 ~ 1610 DEG C, add aluminium deoxidation and alloying, then come out of the stove, (2) ferro-boron, ferrozirconium, tellurium copper master alloy and cerium-based rare earth magnesium alloy being crushed to the fritter that granularity is less than 16mm, after drying 3 ~ 5h through 200 ~ 240 DEG C, being placed in bottom casting ladle, with pouring method in bag, microalloy treatment being carried out to molten steel, (3) molten steel is after leaving standstill, skimming, and pours into casting mold when temperature is 1440 ~ 1470 DEG C, air cooling foundry goods of unpacking after cast 1.0 ~ 6.0h, spruing, cleaning undesirable root, overlap, burr, (4) foundry goods carries out influence of high austenizing temp process at 930 ~ 950 DEG C, after insulation 1.0 ~ 3.0h, in the salt bath that temperature is 260 ~ 290 DEG C, cools 1.0 ~ 2.0h.Chinese invention patent CN103266276A also discloses a kind of preparation method of Low-alloy high-wear-resistancecast cast steel plate, it is characterized in that: obtained by following steps: 1) adopt steel scrap, ferrosilicon, ferromanganese, ferrosilicon, molybdenum-iron, ferrochrome, ferrotianium, vanadium iron, ferro-niobium, rare earth silicon as melting starting material, prepare burden by following component: C:0.25-0.35wt.%; Si:0.9-1.6wt.%; Mn:0.3-1.8wt.%; Cr:0.7-1.0wt.%; Mo:0.15-0.3wt.%; Ti:0.05-0.35wt.%; Nb:0.01-0.05wt.%; V:0.05-0.25wt.%; RE:0.01-0.1wt.%; P, S≤0.03wt.% all the other be Fe and inevitable impurity; 2) adopt medium-frequency induction furnace melting, first by ordinary scrap steel, the fusing of ferrochrome Hybrid Heating, carry out on-the-spot sample analysis; 3) successively ferromanganese, ferrosilicon, molybdenum-iron are added wait all melting down after to add ferrochrome melting down further again, use aluminium wire deoxidation treatment, then molten steel poured the casting ladle simultaneously placing ferrotianium, vanadium iron, ferro-niobium, rare earth silicon; 4) tapping temperature controls, at 1500 ~ 1560 DEG C, to be then poured into casting mould internal shaping, and after cooling, shake out taking-up ingot casting carries out sand removal process; 5) adopt resistive heating heat treatment furnace, the ingot casting after process is put into and wherein heats up, speed≤280 DEG C/h of intensification, be incubated when temperature arrives 1050 ~ 1070 DEG C, insulation 100-130min; 6) again ingot casting is put into 240 ~ 245 DEG C of salt bath furnaces after being incubated to be incubated, insulation 60-90min, air cooling of finally coming out of the stove; 7) after ingot casting being forged and pressed, cut out satisfactory sheet material according to desired size, and conventional passivation process is carried out to plate surface.Chinese invention patent CN103205638A also discloses a kind of wear-resistant cast steel bucket tooth, it is characterized in that, by weight percentage, the material of this wear-resistant cast steel bucket tooth is become to be grouped into by following: C:0.9 ~ 1.2%, Ti:0.2 ~ 0.25%, Al:0.08 ~ 0.12%, Mo:2 ~ 3%, W:3 ~ 5%, P :≤0.02%, S :≤0.02%, surplus is Fe; Described wear-resistant cast steel bucket tooth is prepared according to following operation: 1) by weight percentage, by composition be: C:0.9 ~ 1.2%, Ti:0.2 ~ 0.25%, Al:0.08 ~ 0.12%, Mo:2 ~ 3%, W:3 ~ 5%, P :≤0.02%, S :≤0.02%, surplus is the molten steel desulfurizing of Fe, carry out converter top bottom blowing, RH Fruit storage, come out of the stove when liquid steel temperature is 1660 ~ 1700 DEG C; 2) cast in the wax mould shell that preheating temperature is 450 ~ 500 DEG C desired shape cast steel bucket tooth, cast steel bucket tooth was cooled to the time controling of 1550 DEG C at 10 ~ 15 minutes; 3) when cast steel bucket tooth is cooled to 1250 ~ 1280 DEG C, insulation makes carbide and the abundant disperse educt of intermetallic compound for 1 ~ 2 hour; 4) when cast steel bucket tooth is cooled to 950 ~ 970 DEG C, put into quenching-in water together with wax mould shell, broken wax mould shell, cutting rising head, 200 ~ 220 DEG C of tempering, obtain wear-resistant cast steel bucket tooth.Chinese invention patent CN102978524A also discloses a kind of high-strength abrasion-proof cast steel, it is characterized in that: described a kind of high-strength abrasion-proof cast steel, and its chemical composition and mass percent thereof are: carbon: 0.3-0.8%; Silicon: 0.45-1.35%; Manganese: 1.2-1.8%; Chromium: 0.75-1.9%; Boron: 0.06-0.1%; Titanium: 0.05-0.2%; Yttrium: 0.07-0.18%; Magnesium: 0.06-0.14%, all the other are iron composition.Chinese invention patent CN102912255A also discloses a kind of preparation method of wearable cast steel.Described wearable cast steel, by weight percentage, it consists of: carbon (C): 0.80% ~ 1.10%; Manganese (Mn): 6.00% ~ 8.00%; Silicon (Si): 1.00% ~ 1.80%; Chromium (Cr): 2.50% ~ 3.50%; Molybdenum (Mo): 0.60% ~ 0.80%; Copper (Cu): 0.30% ~ 0.50%; Nickel (Ni): 1.00% ~ 3.00%; Titanium (Ti): 0.15% ~ 0.25%; Vanadium (V): 0.20% ~ 0.40%; Rare earth (RE): 0.030% ~ 0.040%; Magnesium (Mg): 0.020% ~ 0.030%; Surplus is iron (Fe) and inevitable impurity.The wearable cast steel of this invention is excellent in cushion effect, wear resistance good, corrosion-resistant, can weld with general carbon steel cell body.Chinese invention patent CN102877008A also discloses a kind of preparation method of wear-resistant bainite cast steel, it is characterized in that, comprise the following steps: 1) adopt steel scrap, ferromanganese, ferrosilicon, molybdenum-iron, ferrochrome, ferrotianium, vanadium iron, rare earth silicon as melting starting material, the chemical constitution by following weight percent: C is 0.2-0.6%; S is 0.7-2.5%; Mn is 0.3-3.0%; Mo is 0.1-1.5%; Cr is 0.2-3.0%; Ti≤0.5%; V≤0.5%; RE≤0.5%; S, P≤0.06%, all the other are prepared burden for Fe; 2) steel scrap is added melting down in electric furnace after, successively ferromanganese, ferrosilicon, molybdenum-iron are added wait all melting down after to add ferrochrome melting down further again, use aluminium wire deoxidation treatment, then molten steel poured the casting ladle simultaneously placing ferrotianium, vanadium iron, rare earth, RE; 3) under teeming temperature is 1500 ~ 1550 DEG C of conditions, carry out castable, after cooling, shake out taking-up foundry goods carries out sand removal process; 4) foundry goods after sand removal process is put into heat treatment furnace to heat up, be incubated when temperature arrives 850 ~ 1000 DEG C; Foundry goods is put into 200 ~ 350 DEG C of salt bath furnaces after being incubated to be incubated, air cooling of finally coming out of the stove, can obtain wear-resistant bainite cast steel again.Chinese invention patent CN102690988A also discloses the preparation method of the high-strength silicomanganese wear-resistant bainite cast steel of a kind of thin crystalline substance, high-strength its chemical composition of silicomanganese wear-resistant bainite cast steel of thin crystalline substance and weight percent are: 0.40 ~ 0.70%C, 2.2 ~ 2.5%Si, 2.4 ~ 2.8%Mn, 0.01 ~ 0.05%B, 0.005 ~ 0.01%La, P < 0.04%, S < 0.04%, all the other are Fe and inevitable impurity, its as-cast grain size < 100 μm, tensile strength reaches more than 1200MPa, hardness is 48 ~ 60HRC, non-notch impact value reaches 30 ~ 50J.Utilize electric furnace to produce, use through Overheating Treatment after melting casting.Not containing the alloying element such as chromium, molybdenum in steel, by trace B and lanthanum crystal grain thinning, acquisition high strength and the collocation of good tough hardness, cheap, technique is simple, strong operability.Chinese invention patent CN102517504A also discloses one with low price boron for main alloy element, the high boron wear-resisting casting steel of ball grinding machine lining board can be manufactured, the chemical composition of cast steel described in it and mass percent thereof are: C<0.4%, 0.40 ~ 0.80Si, 0.5 ~ 1.2%Mn, 0.5 ~ 1.2%Cr, 1.2 ~ 3.0%B, Re<0.2%, V<0.1%, Ti<0.1%, described cast steel first carries out the quenching technology of 950 ~ 980 DEG C × 2h+ water-cooled, again in 200 ~ 250 DEG C × 4h+ air cooling temper, its hardness is greater than 58HRC, impelling strength is greater than 12J/cm2, through hardening layer depth is greater than 40mm.

Although but above-mentioned wearable cast steel hardness is high, wear resistance at elevated temperature is not enough.In order to meet the wear resistance at elevated temperature of material, Chinese invention patent CN1235203 discloses a kind of high temperature resistant and wear-resistant cast steel with chromium-nickel-nitrogen-niobium, its chemical composition (% by weight) is: 0.5 ~ 1.4%C, Si≤2.5%, Mn≤2.5%, 27.0 ~ 36.0%Cr, 10.0 ~ 20.0%Ni, 0.2 ~ 0.5%N, 0.1 ~ 1.0%Nb, 0.2 ~ 0.5%Re, Fe surplus.The jet burning nozzle of power plant boiler long service life manufactured with this resistant and wear-resistant cast steel, and do not ftracture.Chinese invention patent CN1818119 also discloses a kind of high-temperature heat-resistant and wear-resistant cast steel with chromium, nickel, copper, niobium and nitrogen, and its chemical composition (% by weight) is: 0.3 ~ 2.0%C, Si≤2.5%, Mn≤2.5%, 20.0 ~ 46.0%Cr, 8.0 ~ 50.0%Ni, 0.05 ~ 1.50%Cu, 0.04 ~ 2.50%Nb, 0.05 ~ 0.50%N, 0.05 ~ 0.50%RE, P≤0.06%, S≤0.04%, Fe surplus, it is good that the generating pot manufactured with this resistant and wear-resistant cast steel moves burner nozzle heat crack resistance, long service life, and do not ftracture.But above-mentioned wear-resisting high-temperature anti-abrasion material is also containing more expensive nickel element, and cause material cost to raise, the market competitiveness is weak.

Summary of the invention

The object of the invention is to provide a kind of preparation method of novel High-temperature-resandant andant wear-resistant Alloy Cast Steel, the present invention smelts complex alloy cast-steel in electric furnace, and add the material such as ferro-boron, metallic aluminium in the smelting later stage, reach objects such as improving Alloy Cast Steel wear resistance and high-temperature oxidation resistance.

Object of the present invention can be realized by following measures:

The preparation method of wearable cast steel of the present invention is as follows: first in electric furnace, smelt complex alloy cast-steel, the chemical constitution of complex alloy cast-steel and massfraction thereof are 0.60 ~ 0.85%C, 12.0 ~ 15.0%Cr, 0.8 ~ 1.2%Si, 0.3 ~ 0.5%Mn, 0.8 ~ 1.2%Mo, 1.0 ~ 1.2%Ni, 0.15 ~ 0.22%N, <0.03%S, <0.04%P, surplus Fe.When the liquid steel temperature of above-mentioned complex alloy cast-steel reaches 1580 ~ 1600 DEG C, add ferrosilicon, metallic aluminium, ferro-boron and ferrotianium successively, wherein ferrosilicon add-on is 1.0 ~ 1.5% of steel quality mark in stove, metallic aluminium add-on is 1.8 ~ 2.2% of steel quality mark in stove, ferro-boron add-on is 6.0 ~ 6.5% of steel quality mark in stove, ferrotianium add-on is 0.2 ~ 0.4% of steel quality mark in stove, in addition, ferrosilicon, ferro-boron and ferrotianium add before molten steel all at 750 ~ 850 DEG C of preheating 2 ~ 3h.Then come out of the stove behind molten steel heating to 1610 ~ 1630 DEG C, and molten steel is injected casting ladle.Rare earth ferrosilicomagnesium, Si-Ca-Ba aluminium alloy and vanadium iron being crushed to the fritter that granularity is 5 ~ 12mm and drying 2 ~ 4h at 200 ~ 250 DEG C, being placed in bottom casting ladle, with pouring method in bag, microalloy treatment being carried out to molten steel.Wherein rare earth ferrosilicomagnesium add-on is inject steel quality mark in casting ladle 1.2 ~ 1.5%, and Si-Ca-Ba aluminium alloy add-on is inject steel quality mark in casting ladle 1.2 ~ 1.5%, and vanadium iron add-on is inject steel quality mark in casting ladle 0.15 ~ 0.25%.Then skim, prepare casting, when liquid steel temperature is down to 1460 ~ 1490 DEG C, molten steel is poured into casting mold, foundry goods is through unpacking, heat-treating after sand removal, foundry goods quenching temperature 1050 ~ 1100 DEG C, oil cooling after insulation 2 ~ 4h, then 500 ~ 530 DEG C of temper, after insulation 6 ~ 10h, air cooling is to room temperature.

The chemical constitution of ferrosilicon as above and massfraction are: 72 ~ 80%Si, <0.2%C ,≤0.02%S ,≤0.04%P, surplus Fe.

The chemical constitution of ferro-boron as above and massfraction are: 19.0 ~ 21.0%B ,≤0.5%C ,≤2.0%Si ,≤0.5%Al ,≤0.01%S ,≤0.1%P, surplus Fe.

The chemical constitution of ferrotianium as above and massfraction are: 38 ~ 42%Ti ,≤9.0%Al ,≤3.0%Si ,≤0.03%S ,≤0.03%P ,≤0.10%C ,≤0.40%Cu ,≤2.5%Mn, surplus Fe.

The chemical constitution of rare earth ferrosilicomagnesium as above and massfraction are: 8.0 ~ 10.0%Ce, 8.0 ~ 10.0%Mg, 1.0 ~ 3.0%Ca, 39 ~ 44.0%Si ,≤2.0%Mn ,≤1.0%Ti ,≤1.2%MgO, surplus Fe.

Chemical constitution and the massfraction of Si-Ca-Ba aluminium alloy as above are: 30 ~ 35%Si, 12 ~ 15%Ca, 9 ~ 12%Ba, 16 ~ 20%Al, Mn≤0.4%, C≤0.4%, P≤0.04%, S≤0.04, surplus Fe.

The chemical constitution of vanadium iron as above and massfraction are: 58 ~ 65%V ,≤2.0%Si ,≤2.5%Al ,≤0.06%C ,≤0.05%P ,≤0.05%S ,≤0.06%As ,≤0.1%Cu, surplus Fe.

In wearable cast steel of the present invention, first melting complex alloy cast-steel in electric furnace, the chemical constitution of complex alloy cast-steel and massfraction thereof are 0.60 ~ 0.85%C, 12.0 ~ 15.0%Cr, 0.8 ~ 1.2%Si, 0.3 ~ 0.5%Mn, 0.8 ~ 1.2%Mo, 1.0 ~ 1.2%Ni, 0.15 ~ 0.22%N, <0.03%S, <0.04%P, surplus Fe.Wherein add chromium, molybdenum, nickel object be hardness in order to improve material and wear resistance.In addition the hardening capacity that proper N can improve material is added, on this basis, when the liquid steel temperature of above-mentioned complex alloy cast-steel reaches 1580 ~ 1600, DEG C add ferrosilicon, metallic aluminium, ferro-boron and ferrotianium successively, wherein ferrosilicon add-on is 1.0 ~ 1.5% of steel quality mark in stove, metallic aluminium add-on is 1.8 ~ 2.2% of steel quality mark in stove, and ferro-boron add-on is 6.0 ~ 6.5% of steel quality mark in stove.The object adding ferrosilicon and aluminium, mainly in order to improve the high-temperature behavior of material, adds ferro-boron, can be combined generate high rigidity (Cr, Fe) with the chromium of complex alloy cast-steel, carbon, iron 7(C, B) 3compound, is conducive to the wear resistance improving cast steel.Adding is the ferrotianium of steel quality mark 0.2 ~ 0.4% in stove, can refinement wearable cast steel crystal grain, improves the obdurability of wearable cast steel.

In addition, rare earth ferrosilicomagnesium, Si-Ca-Ba aluminium alloy and vanadium iron being crushed to the fritter that granularity is 5 ~ 12mm and drying 2 ~ 4h at 200 ~ 250 DEG C, being placed in bottom casting ladle, with pouring method in bag, microalloy treatment being carried out to molten steel.Wherein rare earth ferrosilicomagnesium add-on is inject steel quality mark in casting ladle 1.2 ~ 1.5%, and Si-Ca-Ba aluminium alloy add-on is inject steel quality mark in casting ladle 1.2 ~ 1.5%.Adding of rare earth ferrosilicomagnesium and Si-Ca-Ba aluminium alloy can cleaning molten steel, also helps thinning solidification structure, and improves form and the distribution of inclusion, promote the raising of wearable cast steel obdurability.Adding is that the vanadium iron injecting steel quality mark 0.15 ~ 0.25% in casting ladle carries out microalloy treatment to molten steel, can increase the high rigidity VC Hard Inclusion quantity in cast steel, be conducive to improving cast steel wear resistance.On this basis, oil quenching process is carried out to wearable cast steel, quenching temperature 1050 ~ 1100 DEG C, oil cooling after insulation 2 ~ 4h, mainly in order to obtain high hardness martensitic matrix, continue 500 ~ 530 DEG C of temper, after insulation 6 ~ 10h, air cooling is to room temperature, mainly stablize quenching structure, eliminate quenching stress.

The present invention compared with prior art, has following characteristics:

(1) wearable cast steel of the present invention, the expensive alloying elements add-ons such as nickel, molybdenum, vanadium are less, and do not add the expensive alloy element such as tungsten, niobium, cobalt, have lower production cost;

(2) to have hardness high for wearable cast steel of the present invention, and the features such as high temperature abrasion resistance is good, material hardness of the present invention is more than 63HRC, and the wear resistance at 500 DEG C improves more than 35% and 50% respectively than rich chromium cast iron and high nickel-chromium alloy steel.

Below in conjunction with embodiment, the present invention is further described:

Embodiment

Embodiment 1:

Wearable cast steel of the present invention adopts 1000 kilograms of medium-frequency induction furnace meltings, its preparation method is as follows: first in 1000 kilograms of medium-frequency induction furnaces, smelt complex alloy cast-steel, the chemical constitution of complex alloy cast-steel and massfraction thereof are 0.63%C, 12.02%Cr, 1.17%Si, 0.40%Mn, 1.15%Mo, 1.01%Ni, 0.21%N, 0.029%S, 0.035%P, surplus Fe.When the liquid steel temperature of above-mentioned complex alloy cast-steel reaches 1598 DEG C, (chemical constitution of ferrosilicon and massfraction are: 72 ~ 80%Si to add ferrosilicon successively, <0.2%C, ≤ 0.02%S, ≤ 0.04%P, surplus Fe), metallic aluminium, (chemical constitution of ferro-boron and massfraction are ferro-boron: 19.0 ~ 21.0%B, ≤ 0.5%C, ≤ 2.0%Si, ≤ 0.5%Al, ≤ 0.01%S, ≤ 0.1%P, surplus Fe) and ferrotianium (chemical constitution of ferrotianium and massfraction are: 38 ~ 42%Ti, ≤ 9.0%Al, ≤ 3.0%Si, ≤ 0.03%S, ≤ 0.03%P, ≤ 0.10%C, ≤ 0.40%Cu, ≤ 2.5%Mn, surplus Fe), wherein ferrosilicon add-on is 1.0% of steel quality mark in stove, metallic aluminium add-on is 2.2% of steel quality mark in stove, ferro-boron add-on is 6.5% of steel quality mark in stove, ferrotianium add-on is 0.2% of steel quality mark in stove, in addition, ferrosilicon, it is front all at 750 DEG C of preheating 3h that ferro-boron and ferrotianium add molten steel.Then come out of the stove after molten steel heating to 1629 DEG C, and molten steel is injected casting ladle.By rare earth ferrosilicomagnesium, (chemical constitution of rare earth ferrosilicomagnesium and massfraction are: 8.0 ~ 10.0%Ce, 8.0 ~ 10.0%Mg, 1.0 ~ 3.0%Ca, 39 ~ 44.0%Si, ≤ 2.0%Mn, ≤ 1.0%Ti, ≤ 1.2%MgO, surplus Fe), (chemical constitution of Si-Ca-Ba aluminium alloy and massfraction are Si-Ca-Ba aluminium alloy: 30 ~ 35%Si, 12 ~ 15%Ca, 9 ~ 12%Ba, 16 ~ 20%Al, Mn≤0.4%, C≤0.4%, P≤0.04%, S≤0.04, surplus Fe) and vanadium iron (chemical constitution of vanadium iron and massfraction are: 58 ~ 65%V, ≤ 2.0%Si, ≤ 2.5%Al, ≤ 0.06%C, ≤ 0.05%P, ≤ 0.05%S, ≤ 0.06%As, ≤ 0.1%Cu, surplus Fe) be crushed to fritter that granularity is 5 ~ 12mm and dry 4h at 200 DEG C, be placed in bottom casting ladle, with pouring method in bag, microalloy treatment is carried out to molten steel.Wherein rare earth ferrosilicomagnesium add-on is inject steel quality mark in casting ladle 1.2%, and Si-Ca-Ba aluminium alloy add-on is inject steel quality mark in casting ladle 1.5%, and vanadium iron add-on is inject steel quality mark in casting ladle 0.15%.Then skim, prepare casting, when liquid steel temperature is down to 1488 DEG C, molten steel is poured into casting mold, foundry goods is through unpacking, heat-treating after sand removal, foundry goods quenching temperature 1100 DEG C, oil cooling after insulation 2h, then 530 DEG C of temper, after insulation 6h, air cooling can obtain wearable cast steel to room temperature, and the mechanical property of wearable cast steel is in table 1.

Embodiment 2:

Wearable cast steel of the present invention adopts 1000 kilograms of medium-frequency induction furnace meltings, its preparation method is as follows: first in 1000 kilograms of medium-frequency induction furnaces, smelt complex alloy cast-steel, the chemical constitution of complex alloy cast-steel and massfraction thereof are 0.84%C, 14.88%Cr, 0.84%Si, 0.31%Mn, 0.80%Mo, 1.17%Ni, 0.16%N, 0.025%S, 0.036%P, surplus Fe.When the liquid steel temperature of above-mentioned complex alloy cast-steel reaches 1583, (chemical constitution of ferrosilicon and massfraction are: 72 ~ 80%Si DEG C to add ferrosilicon successively, <0.2%C, ≤ 0.02%S, ≤ 0.04%P, surplus Fe), metallic aluminium, (chemical constitution of ferro-boron and massfraction are ferro-boron: 19.0 ~ 21.0%B, ≤ 0.5%C, ≤ 2.0%Si, ≤ 0.5%Al, ≤ 0.01%S, ≤ 0.1%P, surplus Fe) and ferrotianium (chemical constitution of ferrotianium and massfraction are: 38 ~ 42%Ti, ≤ 9.0%Al, ≤ 3.0%Si, ≤ 0.03%S, ≤ 0.03%P, ≤ 0.10%C, ≤ 0.40%Cu, ≤ 2.5%Mn, surplus Fe), wherein ferrosilicon add-on is 1.5% of steel quality mark in stove, metallic aluminium add-on is 1.8% of steel quality mark in stove, ferro-boron add-on is 6.0% of steel quality mark in stove, ferrotianium add-on is 0.4% of steel quality mark in stove, in addition, ferrosilicon, it is front all at 850 DEG C of preheating 2h that ferro-boron and ferrotianium add molten steel.Then come out of the stove after molten steel heating to 1615 DEG C, and molten steel is injected casting ladle.By rare earth ferrosilicomagnesium, (chemical constitution of rare earth ferrosilicomagnesium and massfraction are: 8.0 ~ 10.0%Ce, 8.0 ~ 10.0%Mg, 1.0 ~ 3.0%Ca, 39 ~ 44.0%Si, ≤ 2.0%Mn, ≤ 1.0%Ti, ≤ 1.2%MgO, surplus Fe), (chemical constitution of Si-Ca-Ba aluminium alloy and massfraction are Si-Ca-Ba aluminium alloy: 30 ~ 35%Si, 12 ~ 15%Ca, 9 ~ 12%Ba, 16 ~ 20%Al, Mn≤0.4%, C≤0.4%, P≤0.04%, S≤0.04, surplus Fe) and vanadium iron (chemical constitution of vanadium iron and massfraction are: 58 ~ 65%V, ≤ 2.0%Si, ≤ 2.5%Al, ≤ 0.06%C, ≤ 0.05%P, ≤ 0.05%S, ≤ 0.06%As, ≤ 0.1%Cu, surplus Fe) be crushed to fritter that granularity is 5 ~ 12mm and dry 3h at 250 DEG C, be placed in bottom casting ladle, with pouring method in bag, microalloy treatment is carried out to molten steel.Wherein rare earth ferrosilicomagnesium add-on is inject steel quality mark in casting ladle 1.5%, and Si-Ca-Ba aluminium alloy add-on is inject steel quality mark in casting ladle 1.2%, and vanadium iron add-on is inject steel quality mark in casting ladle 0.25%.Then skim, prepare casting, when liquid steel temperature is down to 1463 DEG C, molten steel is poured into casting mold, foundry goods is through unpacking, heat-treating after sand removal, foundry goods quenching temperature 1050 DEG C, oil cooling after insulation 4h, then 500 DEG C of temper, after insulation 10h, air cooling can obtain wearable cast steel to room temperature, and wearable cast steel mechanical property is in table 1.

Embodiment 3:

Wearable cast steel of the present invention adopts 1000 kilograms of medium-frequency induction furnace meltings, its preparation method is as follows: first in 1000 kilograms of medium-frequency induction furnaces, smelt complex alloy cast-steel, the chemical constitution of complex alloy cast-steel and massfraction thereof are 0.74%C, 13.69%Cr, 0.96%Si, 0.47%Mn, 1.01%Mo, 1.13%Ni, 0.19%N, 0.022%S, 0.037%P, surplus Fe.When the liquid steel temperature of above-mentioned complex alloy cast-steel reaches 1591 DEG C, (chemical constitution of ferrosilicon and massfraction are: 72 ~ 80%Si to add ferrosilicon successively, <0.2%C, ≤ 0.02%S, ≤ 0.04%P, surplus Fe), metallic aluminium, (chemical constitution of ferro-boron and massfraction are ferro-boron: 19.0 ~ 21.0%B, ≤ 0.5%C, ≤ 2.0%Si, ≤ 0.5%Al, ≤ 0.01%S, ≤ 0.1%P, surplus Fe) and ferrotianium (chemical constitution of ferrotianium and massfraction are: 38 ~ 42%Ti, ≤ 9.0%Al, ≤ 3.0%Si, ≤ 0.03%S, ≤ 0.03%P, ≤ 0.10%C, ≤ 0.40%Cu, ≤ 2.5%Mn, surplus Fe), wherein ferrosilicon add-on is 1.3% of steel quality mark in stove, metallic aluminium add-on is 2.0% of steel quality mark in stove, ferro-boron add-on is 6.2% of steel quality mark in stove, ferrotianium add-on is 0.3% of steel quality mark in stove, in addition, ferrosilicon, it is front all at 800 DEG C of preheating 2h that ferro-boron and ferrotianium add molten steel.Then come out of the stove after molten steel heating to 1620 DEG C, and molten steel is injected casting ladle.By rare earth ferrosilicomagnesium, (chemical constitution of rare earth ferrosilicomagnesium and massfraction are: 8.0 ~ 10.0%Ce, 8.0 ~ 10.0%Mg, 1.0 ~ 3.0%Ca, 39 ~ 44.0%Si, ≤ 2.0%Mn, ≤ 1.0%Ti, ≤ 1.2%MgO, surplus Fe), (chemical constitution of Si-Ca-Ba aluminium alloy and massfraction are Si-Ca-Ba aluminium alloy: 30 ~ 35%Si, 12 ~ 15%Ca, 9 ~ 12%Ba, 16 ~ 20%Al, Mn≤0.4%, C≤0.4%, P≤0.04%, S≤0.04, surplus Fe) and vanadium iron (chemical constitution of vanadium iron and massfraction are: 58 ~ 65%V, ≤ 2.0%Si, ≤ 2.5%Al, ≤ 0.06%C, ≤ 0.05%P, ≤ 0.05%S, ≤ 0.06%As, ≤ 0.1%Cu, surplus Fe) be crushed to fritter that granularity is 5 ~ 12mm and dry 3h at 230 DEG C, be placed in bottom casting ladle, with pouring method in bag, microalloy treatment is carried out to molten steel.Wherein rare earth ferrosilicomagnesium add-on is inject steel quality mark in casting ladle 1.3%, and Si-Ca-Ba aluminium alloy add-on is inject steel quality mark in casting ladle 1.4%, and vanadium iron add-on is inject steel quality mark in casting ladle 0.20%.Then skim, prepare casting, when liquid steel temperature is down to 1475 DEG C, molten steel is poured into casting mold, foundry goods is through unpacking, heat-treating after sand removal, foundry goods quenching temperature 1080 DEG C, oil cooling after insulation 3h, then 520 DEG C of temper, after insulation 8h, air cooling can obtain wearable cast steel to room temperature, and wearable cast steel mechanical property is in table 1.

The mechanical property of table 1 wearable cast steel

Wearable cast steel hardness of the present invention is high, good toughness, also has excellent wear resistance under high temperature wear condition.Under 500 DEG C of abrasive wear conditions, the wear weight loss of material of the present invention reduces more than 35% and 50% respectively than rich chromium cast iron (Cr15Mo2Cu1) and high nickel-chromium alloy steel (Cr25Ni20), its high temperature abrasion resistance improves more than 35% and 50% respectively than rich chromium cast iron (Cr15Mo2Cu1) and high nickel-chromium alloy steel (Cr25Ni20), has good popularizing application prospect in high temperature wear field.

Claims (3)

1. a preparation method for wearable cast steel, it is characterized in that adopting electrosmelting, its preparation technology is as follows:
(1) first in electric furnace, smelt complex alloy cast-steel obtains molten steel, the chemical constitution of complex alloy cast-steel and massfraction thereof are 0.60 ~ 0.85%C, 12.0 ~ 15.0%Cr, 0.8 ~ 1.2%Si, 0.3 ~ 0.5%Mn, 0.8 ~ 1.2%Mo, 1.0 ~ 1.2%Ni, 0.15 ~ 0.22%N, <0.03%S, <0.04%P, surplus Fe;
(2) when the liquid steel temperature of above-mentioned complex alloy cast-steel reaches 1580 ~ 1600 DEG C, add metallic aluminium successively, preheated ferrosilicon, ferro-boron and ferrotianium, wherein ferrosilicon add-on is 1.0 ~ 1.5% of steel quality mark in stove, metallic aluminium add-on is 1.8 ~ 2.2% of steel quality mark in stove, ferro-boron add-on is 6.0 ~ 6.5% of steel quality mark in stove, ferrotianium add-on is 0.2 ~ 0.4% of steel quality mark in stove, then come out of the stove behind molten steel heating to 1610 ~ 1630 DEG C, and molten steel is injected casting ladle;
(3) rare earth ferrosilicomagnesium, Si-Ca-Ba aluminium alloy and vanadium iron being crushed to the fritter that granularity is 5 ~ 12mm and drying, being placed in bottom casting ladle, with pouring method in bag, microalloy treatment being carried out to molten steel; Wherein rare earth ferrosilicomagnesium add-on is inject steel quality mark in casting ladle 1.2 ~ 1.5%, Si-Ca-Ba aluminium alloy add-on is inject steel quality mark in casting ladle 1.2 ~ 1.5%, and vanadium iron add-on is inject steel quality mark in casting ladle 0.15 ~ 0.25%;
(4) molten steel prepares casting after skimming, and when liquid steel temperature is down to 1460 ~ 1490 DEG C, molten steel is poured into casting mold;
(5) foundry goods is through unpacking, heat-treating after sand removal, foundry goods quenching temperature 1050 ~ 1100 DEG C, oil cooling after insulation 2 ~ 4h, and then 500 ~ 530 DEG C of temper, after insulation 6 ~ 10h, air cooling is to room temperature;
The chemical constitution of described ferrosilicon and massfraction are: 72 ~ 80%Si, <0.2%C ,≤0.02%S ,≤0.04%P, surplus Fe;
The chemical constitution of described ferro-boron and massfraction are: 19.0 ~ 21.0%B ,≤0.5%C ,≤2.0%Si ,≤0.5%Al ,≤0.01%S ,≤0.1%P, surplus Fe;
The chemical constitution of described ferrotianium and massfraction are: 38 ~ 42%Ti ,≤9.0%Al ,≤3.0%Si ,≤0.03%S ,≤0.03%P ,≤0.10%C ,≤0.40%Cu ,≤2.5%Mn, surplus Fe;
The chemical constitution of described rare earth ferrosilicomagnesium and massfraction are: 8.0 ~ 10.0%Ce, 8.0 ~ 10.0%Mg, 1.0 ~ 3.0%Ca, 39 ~ 44.0%Si ,≤2.0%Mn ,≤1.0%Ti ,≤1.2%MgO, surplus Fe;
Chemical constitution and the massfraction of described Si-Ca-Ba aluminium alloy are: 30 ~ 35%Si, 12 ~ 15%Ca, 9 ~ 12%Ba, 16 ~ 20%Al, Mn≤0.4%, C≤0.4%, P≤0.04%, S≤0.04, surplus Fe;
The chemical constitution of described vanadium iron and massfraction are: 58 ~ 65%V ,≤2.0%Si ,≤2.5%Al ,≤0.06%C ,≤0.05%P ,≤0.05%S ,≤0.06%As ,≤0.1%Cu, surplus Fe.
2. the preparation method of wearable cast steel according to claim 1, is characterized in that the pre-heating technique of described ferrosilicon, ferro-boron and ferrotianium is: 750 ~ 850 DEG C, insulation 2 ~ 3h.
3. the preparation method of wearable cast steel according to claim 1, is characterized in that described rare earth ferrosilicomagnesium, Si-Ca-Ba aluminium alloy and vanadium iron fritter stoving process are: 200 ~ 250 DEG C, insulation 2 ~ 4h.
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