CN105154764A - Light-weight high manganese steel lining plate for crusher and preparation method of light-weight high manganese steel lining plate - Google Patents
Light-weight high manganese steel lining plate for crusher and preparation method of light-weight high manganese steel lining plate Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 claims abstract description 34
- 238000005266 casting Methods 0.000 claims abstract description 31
- 239000011572 manganese Substances 0.000 claims abstract description 17
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 15
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 15
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 15
- 229910052796 boron Inorganic materials 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 13
- 229910052684 Cerium Inorganic materials 0.000 claims abstract description 12
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- 238000005480 shot peening Methods 0.000 claims description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 29
- 150000002910 rare earth metals Chemical class 0.000 claims description 29
- 238000009413 insulation Methods 0.000 claims description 23
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- 238000007664 blowing Methods 0.000 claims description 20
- 239000007789 gas Substances 0.000 claims description 20
- 238000003756 stirring Methods 0.000 claims description 20
- 238000002791 soaking Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 15
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- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
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Abstract
The invention discloses a light-weight high manganese steel lining plate for a crusher and a preparation method of the light-weight high manganese steel lining plate. The light-weight high manganese steel lining plate comprises the following chemical components in percentage by mass: 1.0-1.5 percent of C, 0.3-0.5 percent of Si, 18-26 percent of Mn, 6-8 percent of Al, 0.002-0.005 percent of B, 0.01-0.03 percent of RE (La and Ce mischmetal), less than 0.01 percent of P, less than 0.03 percent of S and the balance of Fe and inevitable impurities, and the density of the lining plate is 6.6-7.1 g/cm<3>. The preparation method comprises the steps of smelting, casting, separating, heat treatment and shot blasting, and the density of the light-weight high manganese steel lining plate is 9-15 percent lower than that of a conventional high manganese steel lining plate. Besides, the adopted steel has excellent hardness and impact ductility, and the wearing resistance of the adopted steel is 40 percent or above higher than that of ordinary high manganese steel. The light-weight high manganese steel lining plate has the advantages of low cost, high wearing resistance and low density.
Description
Technical field
The invention belongs to preparation equipment technical field, especially a kind of crusher lightweight high manganese steel lining plate and preparation method thereof.
Background technology
Along with the continuous expansion of production scale of enterprise and the reduction of ore grade, the throughput of crusher is more and more large, and the direction that China progressively maximizes towards crusher strides forward; But world energy sources is increasingly in short supply, cause fuel price to climb up and up, conserve energy consumption has become the common recognition of countries in the world.To energy expenditure and the steel consumption of crushing material process, become the emphasis of many national surveys research.Traditional lining material generally adopts high mangaenese steel to cast, and the annual high manganese steel lining plate consumed in the whole nation reaches millions of tons.In the last few years, there are some Super-high Manganese lining board of crushers, as the patent of publication number CN102433508A, provide a kind of Super-high Manganese lining board of crusher and preparation method thereof; Although its wear resistance improves 30% than common high mangaenese steel, Large Crusher uses, because the weight of its liner plate is comparatively large, so increase energy consumption, the wear resistance net effect causing it to increase is so unobvious; And for example patent No. CN1080327 discloses low-alloy abrasion-resistant lining board of crusher and manufacturing process, and this invention is owing to adding expensive molybdenum and copper, and therefore production cost is higher.
Summary of the invention
The object of the present invention is to provide a kind of crusher lightweight high manganese steel lining plate and preparation method thereof, by reasonable component design with Design of Heat Treatment Process provides that a kind of wear resistance is better, production cost is low, long service life, the preparation method of lightweight lining board of crusher of crusher production less energy-consumption and technique.
Chemical composition per-cent of the present invention is: 1.0% ~ 1.5%C, 0.3% ~ 0.5%Si, 18% ~ 26%Mn, 6% ~ 8%Al, 0.002% ~ 0.005%B, 0.01% ~ 0.03%RE(La and Ce mishmetal), P<0.01%, S<0.03%, surplus is Fe and inevitable impurity.
Acting as of crusher lightweight high manganese steel lining plate chemical composition of the present invention:
C: carbon is the principal element determining high mangaenese steel mechanical property and wear resistance, but during too high levels, causes micro-flaw; When carbon content is too low, although toughness is high, wear resistance is inadequate.
Si: silicon can be solid-solution in austenite in high mangaenese steel, improves hardness and the intensity of sosoloid, the effect of Intensive intervention body, improves yield strength.When silicone content is higher, makes high mangaenese steel produce coarse-grain, promote carbide intercrystalline precipitation, reduce toughness and the wear resistance of steel; When silicone content is lower, carbide, often in faller gill shape, reduces impelling strength.
Mn: the work hardening capacity that can improve high mangaenese steel, maintains again the austenite structure of high tenacity.Big cross section and baroque foundry goods manganese content should be high, for the foundry goods of intense impact, then adopt low-carbon (LC) and Gao Meng; Improve the important directions that wear resistance is Austenitic Manganese Steel development when not reducing impelling strength for this reason.
Al: the problem that the abnormal growth of high mangaenese steel austenite crystal can be improved, can also reduce and eliminate net secondary carbide in high mangaenese steel as-cast structure, improve the as cast condition notched bar impact strength of high mangaenese steel and can improve Cast Austenite matrix work hardening capacity, on heavy section casting, these effects of aluminium are larger; But aluminium reduces austenitic area element, in order to obtain austenite structure in room temperature, the content of aluminium then must be controlled well when other constituent contents are certain.
B: on the impact of Fe-C state diagram be reduce γ to delta ferrite transition point (A4), improve γ to alpha ferrite transition point (A3), reduce γ district.Add 0.0015% ~ 0.0030%B, be equivalent to the effect of 0.3%Cr, 0.1 ~ 015%Mo, 0.12%V, add the boron of trace, in the tiny point-like that austenite grain boundary is formed, although boron phase also forms netted, its toughness does not reduce.But its quantity makes grain coarsening time too much on the contrary, and in crystal boundary enrichment, the impelling strength of steel is caused obviously to reduce.
RE(Ce), Ca: calcium and cerium add in molten steel as alterant, the higher compound of fusing point can be formed with the low melting point such as phosphorus, arsenic harmful element in steel, and these can also be suppressed to be mixed in segregation on crystal boundary, desulfating and deoxidation simultaneously, obvious optimization slab quality, crystal grain thinning thus improve the plasticity of steel and toughness.
P, S: p and s, as harmful element, produces the eutectic of MnS and P, is distributed on crystal boundary, reduces impelling strength; Along with the increase of P amount, the work-ing life of liner plate reduces, and is easy to the segregation occurring C, Mn, can aggravates the deleterious effect of phosphorus in high mangaenese steel.Strictly must control its content.
Crusher lightweight high manganese steel lining plate preparation method of the present invention, step is as follows:
(1) in medium-frequency induction furnace, carry out melting, add Al when liquid steel temperature to 1500 ~ 1550 DEG C, before tapping, 10min first adds Ca, stirs, Ca is evenly distributed after adding Ca with airway blowing argon gas; Then the rare earth alterative of preheating added molten steel and carry out modification, after adding rare earth, blowing argon gas stirs, remove the gred; Then 1530 ~ 1580 DEG C by molten steel down in ladle, prepare casting;
(2) being down to 1420 ~ 1460 DEG C when temperature is poured in sand mold mould die cavity, and casting duration is no more than 10min;
(3) when cast(ing) surface temperature is no more than 400 DEG C, liner plate is carried out be separated, refine;
(4) thermal treatment: use can accurately control rate of heating, temperature, soaking time electric furnace foundry goods is heat-treated.Be heated in the temperature range of 550 ~ 650 DEG C with 60 ~ 80 DEG C/h rate of heating from normal temperature, determine soaking time with the maximum thickness of liner plate, insulation 1 ~ 2h; Rate of heating brings up to 150 ~ 200 DEG C/h afterwards, until water-quenched slag 1050 ~ 1080 DEG C, determines soaking time with the maximum thickness of liner plate, insulation 2 ~ 4h; After insulation, rapid pull-out from stove by foundry goods is dropped in water, and water temperature controls at 15 ~ 30 DEG C, quenching end of a period water temperature < 50 DEG C, pond volume>=400m
3; After water-tenacity treatment, then at 500 ~ 550 DEG C of high tempering 2.5h ~ 5h, determine soaking time with the maximum thickness of liner plate, take out air cooling;
(5) shot peening: the significant parameter of shot-blast process is air pressure 0.15 ~ 0.20MPa, the cast steel 30 ball-type bullet of diameter 0.2mm, jet angle 80 ~ 90 °, jet length 120 ~ 140mm, bullet flow 6 ~ 8kg/min, shot peening time < 30min.
The present invention compared with prior art tool has the following advantages:
1. the present invention is designed by optimized alloy, compared with prior art, has lower density, and the high manganese steel lining plate density of casting is at 6.60 ~ 7.10g/cm
3, reduce by 9% ~ 15% than existing high mangaenese steel density; In addition, steel grade of the present invention also has excellent hardness and impelling strength, and the comparable common high mangaenese steel of fastness to rubbing improves more than 40%;
2. do not contain the noble metal such as copper, molybdenum in liner plate of the present invention, compared with middle low-alloy abrasion-resistant lining board of crusher, liner plate cost of the present invention obviously reduces, and its cost performance is higher.
Accompanying drawing explanation
Fig. 1 is thermal treatment process route of the present invention;
Fig. 2 is material metallographic structure figure of the present invention;
Fig. 3 is crusher lightweight high manganese steel lining plate scanned photograph (SEM) and the carbonization energy spectrum analysis (EDS) of embodiment 1, and wherein (b) is the scanned photograph (SEM) representing different positions respectively;
Fig. 4 (c) is carbide energy spectrum analysis (EDS).
Embodiment
Following embodiment for illustration of the present invention, but is not used for limiting range of application of the present invention, and the technical scheme that other Application Areass are equal to also belongs to category of the present invention, and scope of patent protection of the present invention should be limited by every claim.
Embodiment one: crusher novel light high manganese steel lining plate chemical component weight per-cent is: 1%C, 0.4%Si, 23.8%Mn, 7.1%Al, 0.003%B, 0.01%RE(60%Ce+40%La mixed light rare earth), P<0.01%, S<0.03%, surplus is Fe.
Crusher novel light high manganese steel lining plate and preparation method thereof, comprises the following steps:
Smelt casting: in medium-frequency induction furnace, carry out melting, add Al when liquid steel temperature to 1500 ~ 1550 DEG C, before tapping, 10min first adds that Ca(add-on is quality of molten steel 1%), stir with airway blowing argon gas after adding Ca, Ca is evenly distributed; Then the rare earth alterative of preheating added molten steel and carry out modification (add-on is 0.02% of quality of molten steel), after adding rare earth, blowing argon gas stirs, remove the gred; Then 1530 ~ 1580 DEG C by molten steel down in ladle, prepare casting; Being down to 1420 ~ 1460 DEG C when temperature is poured in sand mold mould die cavity, and casting duration is no more than 10min; When cast(ing) surface temperature is no more than 400 DEG C, liner plate is carried out be separated, refine;
Thermal treatment: use can accurately control rate of heating, temperature, soaking time electric furnace to fine grinding after liner plate heat-treat.The maximum thickness of the temperature range inside holding 2h(liner plate of 650 DEG C is heated to from normal temperature for 100mm) with 80 DEG C/h rate of heating; Rate of heating brings up to 180 DEG C/h afterwards, until water-quenched slag 1080 DEG C, and insulation 4h; After insulation, rapid pull-out from stove by foundry goods is dropped in water, and water temperature controls at 25 DEG C, and quenching end of a period water temperature 45 DEG C, pond volume is 400m
3;
Shot peening: the significant parameter of shot-blast process is air pressure 0.18MPa, the cast steel 30 ball-type bullet of diameter 0.2mm, jet angle 85 °, jet length 130mm, bullet flow 7kg/min, shot peening time 25min.
The mechanical property of the crusher novel light high manganese steel lining plate obtained in the present embodiment is: tensile strength 809.6MPa, yield strength 410.9MPa, unit elongation 59.6%, impelling strength 231.3Jcm
-2, the non-shot peening of hardness 205HB(), after shot peening, hardness 550HV(case depth is 50 μm); Density is 6.84g/cm
3.
Embodiment two: crusher novel light high manganese steel lining plate chemical component weight per-cent is: 1%C, 0.4%Si, 23.8%Mn, 7.1%Al, 0.003%B, 0.01%RE(60%Ce+40%La mixed light rare earth), P<0.01%, S<0.03%, surplus is Fe.
Crusher novel light high manganese steel lining plate and preparation method thereof, comprises the following steps:
Smelt casting: in medium-frequency induction furnace, carry out melting, add Al when liquid steel temperature to 1500 ~ 1550 DEG C, before tapping, 10min first adds that Ca(add-on is quality of molten steel 1%), stir with airway blowing argon gas after adding Ca, Ca is evenly distributed; Then the rare earth alterative of preheating added molten steel and carry out modification (add-on is 0.02% of quality of molten steel), after adding rare earth, blowing argon gas stirs, remove the gred; Then 1530 ~ 1580 DEG C by molten steel down in ladle, prepare casting; Being down to 1420 ~ 1460 DEG C when temperature is poured in sand mold mould die cavity, and casting duration is no more than 10min; When cast(ing) surface temperature is no more than 400 DEG C, liner plate is carried out be separated, refine;
Thermal treatment: use can accurately control rate of heating, temperature, soaking time electric furnace to fine grinding after liner plate heat-treat.The maximum thickness of the temperature range inside holding 2h(liner plate of 650 DEG C is heated to from normal temperature for 100mm) with 80 DEG C/h rate of heating; Rate of heating brings up to 180 DEG C/h afterwards, until water-quenched slag 1080 DEG C, and insulation 4h; After insulation, rapid pull-out from stove by foundry goods is dropped in water, and water temperature controls at 25 DEG C, and quenching end of a period water temperature 45 DEG C, pond volume is 400m
3; After water-tenacity treatment, then at 500 DEG C of high tempering 4h, take out air cooling;
Shot peening: the significant parameter of shot-blast process is air pressure 0.18MPa, the cast steel 30 ball-type bullet of diameter 0.2mm, jet angle 85 °, jet length 130mm, bullet flow 7kg/min, shot peening time 25min.
The mechanical property of the crusher novel light high manganese steel lining plate obtained in the present embodiment is: tensile strength 798MPa, yield strength 500MPa, unit elongation 43%, impelling strength 193Jcm
-2, the non-shot peening of hardness 237HB(), after shot peening, hardness 615HV(case depth is 50 μm); Density is 6.84g/cm
3.
Embodiment three: crusher novel light high manganese steel lining plate chemical component weight per-cent is: 1%C, 0.4%Si, 23.8%Mn, 7.1%Al, 0.003%B, 0.01%RE(60%Ce+40%La mixed light rare earth), P<0.01%, S<0.03%, surplus is Fe.
Crusher novel light high manganese steel lining plate and preparation method thereof, comprises the following steps:
Smelt casting: in medium-frequency induction furnace, carry out melting, add Al when liquid steel temperature to 1500 ~ 1550 DEG C, before tapping, 10min first adds that Ca(add-on is quality of molten steel 1%), stir with airway blowing argon gas after adding Ca, Ca is evenly distributed; Then the rare earth alterative of preheating added molten steel and carry out modification (add-on is 0.02% of quality of molten steel), after adding rare earth, blowing argon gas stirs, remove the gred; Then 1530 ~ 1580 DEG C by molten steel down in ladle, prepare casting; Being down to 1420 ~ 1460 DEG C when temperature is poured in sand mold mould die cavity, and casting duration is no more than 10min; When cast(ing) surface temperature is no more than 400 DEG C, liner plate is carried out be separated, refine;
Thermal treatment: use can accurately control rate of heating, temperature, soaking time electric furnace to fine grinding after liner plate heat-treat.The maximum thickness of the temperature range inside holding 2h(liner plate of 650 DEG C is heated to from normal temperature for 100mm) with 80 DEG C/h rate of heating; Rate of heating brings up to 180 DEG C/h afterwards, until water-quenched slag 1080 DEG C, and insulation 4h; After insulation, rapid pull-out from stove by foundry goods is dropped in water, and water temperature controls at 25 DEG C, and quenching end of a period water temperature 45 DEG C, pond volume is 400m
3; After water-tenacity treatment, then at 500 DEG C of high tempering 5h, take out air cooling;
Shot peening: the significant parameter of shot-blast process is air pressure 0.18MPa, the cast steel 30 ball-type bullet of diameter 0.2mm, jet angle 85 °, jet length 130mm, bullet flow 7kg/min, shot peening time 25min.
The mechanical property of the crusher novel light high manganese steel lining plate obtained in the present embodiment is: tensile strength 825MPa, yield strength 574MPa, unit elongation 32%, impelling strength 156Jcm
-2, the non-shot peening of hardness 271HB(), after shot peening, hardness 700HV(case depth is 50 μm); Density is 6.84g/cm
3.
Embodiment four: crusher novel light high manganese steel lining plate chemical component weight per-cent is: 1.3%C, 0.45%Si, 25.7%Mn, 6.6%Al, 0.002%B, 0.01%RE(60%Ce+40%La mixed light rare earth), P<0.01%, S<0.03%, surplus is Fe.
Crusher novel light high manganese steel lining plate and preparation method thereof, comprises the following steps:
Smelt casting: in medium-frequency induction furnace, carry out melting, add Al when liquid steel temperature to 1500 ~ 1550 DEG C, before tapping, 10min first adds that Ca(add-on is quality of molten steel 1%), stir with airway blowing argon gas after adding Ca, Ca is evenly distributed; Then the rare earth alterative of preheating added molten steel and carry out modification (add-on is 0.02% of quality of molten steel), after adding rare earth, blowing argon gas stirs, remove the gred; Then 1530 ~ 1580 DEG C by molten steel down in ladle, prepare casting; Being down to 1420 ~ 1460 DEG C when temperature is poured in sand mold mould die cavity, and casting duration is no more than 10min; When cast(ing) surface temperature is no more than 400 DEG C, liner plate is carried out be separated, refine;
Thermal treatment: use can accurately control rate of heating, temperature, soaking time electric furnace to fine grinding after liner plate heat-treat.The maximum thickness of the temperature range inside holding 1.5h(liner plate of 650 DEG C is heated to from normal temperature for 75mm) with 80 DEG C/h rate of heating; Rate of heating brings up to 180 DEG C/h afterwards, until water-quenched slag 1050 DEG C, and insulation 3h; After insulation, rapid pull-out from stove by foundry goods is dropped in water, and water temperature controls at 25 DEG C, and quenching end of a period water temperature 45 DEG C, pond volume is 400m
3;
Shot peening: the significant parameter of shot-blast process is air pressure 0.18MPa, the cast steel 30 ball-type bullet of diameter 0.2mm, jet angle 85 °, jet length 130mm, bullet flow 7kg/min, shot peening time 25min.
The mechanical property of the crusher novel light high manganese steel lining plate obtained in the present embodiment is: tensile strength 767.9MPa, yield strength 395.5MPa, unit elongation 58.8%, impelling strength 263.9Jcm
-2, the non-shot peening of hardness 220.3HB(), after shot peening, hardness 575HV(case depth is 50 μm); Density is 6.76g/cm
3.
Embodiment five: crusher novel light high manganese steel lining plate chemical component weight per-cent is: 1.3%C, 0.45%Si, 25.7%Mn, 6.6%Al, 0.002%B, 0.01%RE(60%Ce+40%La mixed light rare earth), P<0.01%, S<0.03%, surplus is Fe.
Crusher novel light high manganese steel lining plate and preparation method thereof, comprises the following steps:
Smelt casting: in medium-frequency induction furnace, carry out melting, add Al when liquid steel temperature to 1500 ~ 1550 DEG C, before tapping, 10min first adds that Ca(add-on is quality of molten steel 1%), stir with airway blowing argon gas after adding Ca, Ca is evenly distributed; Then the rare earth alterative of preheating added molten steel and carry out modification (add-on is 0.02% of quality of molten steel), after adding rare earth, blowing argon gas stirs, remove the gred; Then 1530 ~ 1580 DEG C by molten steel down in ladle, prepare casting; Being down to 1420 ~ 1460 DEG C when temperature is poured in sand mold mould die cavity, and casting duration is no more than 10min; When cast(ing) surface temperature is no more than 400 DEG C, liner plate is carried out be separated, refine;
Thermal treatment: use can accurately control rate of heating, temperature, soaking time electric furnace to fine grinding after liner plate heat-treat.The maximum thickness of the temperature range inside holding 1.5h(liner plate of 650 DEG C is heated to from normal temperature for 75mm) with 80 DEG C/h rate of heating; Rate of heating brings up to 180 DEG C/h afterwards, until water-quenched slag 1050 DEG C, and insulation 3h; After insulation, rapid pull-out from stove by foundry goods is dropped in water, and water temperature controls at 25 DEG C, and quenching end of a period water temperature 45 DEG C, pond volume is 400m
3; After water-tenacity treatment, then at 500 DEG C of high tempering 2.5h, take out air cooling;
Shot peening: the significant parameter of shot-blast process is air pressure 0.18MPa, the cast steel 30 ball-type bullet of diameter 0.2mm, jet angle 85 °, jet length 130mm, bullet flow 7kg/min, shot peening time 25min.
The mechanical property of the crusher novel light high manganese steel lining plate obtained in the present embodiment is: tensile strength 738MPa, yield strength 443MPa, unit elongation 47%, impelling strength 248Jcm
-2, the non-shot peening of hardness 242HB(), after shot peening, hardness 632HV(case depth is 50 μm); Density is 6.76g/cm
3.
Embodiment six: crusher novel light high manganese steel lining plate chemical component weight per-cent is: 1.3%C, 0.45%Si, 25.7%Mn, 6.6%Al, 0.002%B, 0.01%RE(60%Ce+40%La mixed light rare earth), P<0.01%, S<0.03%, surplus is Fe.
Crusher novel light high manganese steel lining plate and preparation method thereof, comprises the following steps:
Smelt casting: in medium-frequency induction furnace, carry out melting, add Al when liquid steel temperature to 1500 ~ 1550 DEG C, before tapping, 10min first adds that Ca(add-on is quality of molten steel 1%), stir with airway blowing argon gas after adding Ca, Ca is evenly distributed; Then the rare earth alterative of preheating added molten steel and carry out modification (add-on is 0.02% of quality of molten steel), after adding rare earth, blowing argon gas stirs, remove the gred; Then 1530 ~ 1580 DEG C by molten steel down in ladle, prepare casting; Being down to 1420 ~ 1460 DEG C when temperature is poured in sand mold mould die cavity, and casting duration is no more than 10min; When cast(ing) surface temperature is no more than 400 DEG C, liner plate is carried out be separated, refine;
Thermal treatment: use can accurately control rate of heating, temperature, soaking time electric furnace to fine grinding after liner plate heat-treat.The maximum thickness of the temperature range inside holding 1.5h(liner plate of 650 DEG C is heated to from normal temperature for 75mm) with 80 DEG C/h rate of heating; Rate of heating brings up to 180 DEG C/h afterwards, until water-quenched slag 1050 DEG C, and insulation 3h; After insulation, rapid pull-out from stove by foundry goods is dropped in water, and water temperature controls at 25 DEG C, and quenching end of a period water temperature 45 DEG C, pond volume is 400m
3; After water-tenacity treatment, then at 500 DEG C of high tempering 3.5h, take out air cooling;
Shot peening: the significant parameter of shot-blast process is air pressure 0.18MPa, the cast steel 30 ball-type bullet of diameter 0.2mm, jet angle 85 °, jet length 130mm, bullet flow 7kg/min, shot peening time 25min.
The mechanical property of the crusher novel light high manganese steel lining plate obtained in the present embodiment is: tensile strength 752MPa, yield strength 453MPa, unit elongation 47%, impelling strength 238Jcm
-2, the non-shot peening of hardness 254HB(), after shot peening, hardness 651HV(case depth is 50 μm); Density is 6.76g/cm
3.
Embodiment seven: crusher novel light high manganese steel lining plate chemical component weight per-cent is: 1.3%C, 0.45%Si, 25.7%Mn, 6.6%Al, 0.002%B, 0.01%RE(60%Ce+40%La mixed light rare earth), P<0.01%, S<0.03%, surplus is Fe.
Crusher novel light high manganese steel lining plate and preparation method thereof, comprises the following steps:
Smelt casting: in medium-frequency induction furnace, carry out melting, add Al when liquid steel temperature to 1500 ~ 1550 DEG C, before tapping, 10min first adds that Ca(add-on is quality of molten steel 1%), stir with airway blowing argon gas after adding Ca, Ca is evenly distributed; Then the rare earth alterative of preheating added molten steel and carry out modification (add-on is 0.02% of quality of molten steel), after adding rare earth, blowing argon gas stirs, remove the gred; Then 1530 ~ 1580 DEG C by molten steel down in ladle, prepare casting; Being down to 1420 ~ 1460 DEG C when temperature is poured in sand mold mould die cavity, and casting duration is no more than 10min; When cast(ing) surface temperature is no more than 400 DEG C, liner plate is carried out be separated, refine;
Thermal treatment: use can accurately control rate of heating, temperature, soaking time electric furnace to fine grinding after liner plate heat-treat.The maximum thickness of the temperature range inside holding 1.5h(liner plate of 650 DEG C is heated to from normal temperature for 75mm) with 80 DEG C/h rate of heating; Rate of heating brings up to 180 DEG C/h afterwards, until water-quenched slag 1050 DEG C, and insulation 3h; After insulation, rapid pull-out from stove by foundry goods is dropped in water, and water temperature controls at 25 DEG C, and quenching end of a period water temperature 45 DEG C, pond volume is 400m
3; After water-tenacity treatment, then at 550 DEG C of high tempering 2.5h, take out air cooling;
Shot peening: the significant parameter of shot-blast process is air pressure 0.18MPa, the cast steel 30 ball-type bullet of diameter 0.2mm, jet angle 85 °, jet length 130mm, bullet flow 7kg/min, shot peening time 25min.
The mechanical property of the crusher novel light high manganese steel lining plate obtained in the present embodiment is: tensile strength 731MPa, yield strength 503MPa, unit elongation 53%, impelling strength 180Jcm
-2, the non-shot peening of hardness 245HB(), after shot peening, hardness 638HV(case depth is 50 μm); Density is 6.76g/cm
3.
Embodiment eight: crusher novel light high manganese steel lining plate chemical component weight per-cent is: 1.3%C, 0.45%Si, 25.7%Mn, 6.6%Al, 0.002%B, 0.01%RE(60%Ce+40%La mixed light rare earth), P<0.01%, S<0.03%, surplus is Fe.
Crusher novel light high manganese steel lining plate and preparation method thereof, comprises the following steps:
Smelt casting: in medium-frequency induction furnace, carry out melting, add Al when liquid steel temperature to 1500 ~ 1550 DEG C, before tapping, 10min first adds that Ca(add-on is quality of molten steel 1%), stir with airway blowing argon gas after adding Ca, Ca is evenly distributed; Then the rare earth alterative of preheating added molten steel and carry out modification (add-on is 0.02% of quality of molten steel), after adding rare earth, blowing argon gas stirs, remove the gred; Then 1530 ~ 1580 DEG C by molten steel down in ladle, prepare casting; Being down to 1420 ~ 1460 DEG C when temperature is poured in sand mold mould die cavity, and casting duration is no more than 10min; When cast(ing) surface temperature is no more than 400 DEG C, liner plate is carried out be separated, refine;
Thermal treatment: use can accurately control rate of heating, temperature, soaking time electric furnace to fine grinding after liner plate heat-treat.The maximum thickness of the temperature range inside holding 1.5h(liner plate of 650 DEG C is heated to from normal temperature for 75m) with 80 DEG C/h rate of heating; Rate of heating brings up to 180 DEG C/h afterwards, until water-quenched slag 1050 DEG C, and insulation 3h; After insulation, rapid pull-out from stove by foundry goods is dropped in water, and water temperature controls at 25 DEG C, and quenching end of a period water temperature 45 DEG C, pond volume is 400m
3; After water-tenacity treatment, then at 550 DEG C of high tempering 3.5h, take out air cooling;
Shot peening: the significant parameter of shot-blast process is air pressure 0.18MPa, the cast steel 30 ball-type bullet of diameter 0.2mm, jet angle 85 °, jet length 130mm, bullet flow 7kg/min, shot peening time 25min.
The mechanical property of the crusher novel light high manganese steel lining plate obtained in the present embodiment is: tensile strength 789MPa, yield strength 612MPa, unit elongation 56%, impelling strength 168Jcm
-2, the non-shot peening of hardness 272HB(), after shot peening, hardness 695HV(case depth is 50 μm); Density is 6.76g/cm
3.
Table 1 liner plate chemical composition (Wt%)
| Embodiment | C | Si | Mn | Al | B | RE | P | S |
| 1~3 | 1.0 | 0.4 | 23.8 | 7.1 | 0.003 | 0.01 | <0.01 | <0.03 |
| 4~8 | 1.3 | 0.45 | 25.7 | 6.6 | 0.002 | 0.01 | <0.01 | <0.03 |
Table 2 liner plate preparation technology parameter
| Embodiment | Tapping temperature/DEG C | Teeming temperature/DEG C | Quenching temperature/DEG C | Soaking time/h | Tempering temperature/DEG C | Soaking time/h |
| 1 | 1550 | 1450 | 1080 | 4 | - | - |
| 2 | 1530 | 1440 | 1080 | 4 | 500 | 4 |
| 3 | 1550 | 1460 | 1080 | 4 | 500 | 5 |
| 4 | 1545 | 1450 | 1050 | 3 | - | - |
| 5 | 1540 | 1460 | 1050 | 3 | 500 | 2.5 |
| 6 | 1535 | 1455 | 1050 | 3 | 500 | 3.5 |
| 7 | 1540 | 1435 | 1050 | 3 | 550 | 2.5 |
| 8 | 1520 | 1450 | 1050 | 3 | 550 | 3.5 |
Table 3 liner plate mechanical property
| Embodiment | R m/ MPa | Rp 0.2/ MPa | A/% | a k/J·cm -2 | The non-shot-peening of hardness 1()/HB | Hardness 2(shot-peening)/HV |
| 1 | 809.6 | 410.9 | 59.6 | 231.3 | 205 | 550 |
| 2 | 798 | 500 | 43 | 193 | 237 | 615 |
| 3 | 825 | 574 | 32 | 156 | 271 | 700 |
| 4 | 767.9 | 395.5 | 58.8 | 263.9 | 220.3 | 575 |
| 5 | 738 | 443 | 47 | 248 | 242 | 632 |
| 6 | 752 | 453 | 47 | 238 | 254 | 651 |
| 7 | 731 | 503 | 53 | 180 | 245 | 638 |
| 8 | 789 | 612 | 56 | 168 | 272 | 695 |
Fig. 1 is thermal treatment process route.As-cast structure due to high mangaenese steel is austenite, and carbide and a small amount of phase-change product perlite formed.Along the toughness of the carbide reduction steel that austenite grain boundary is separated out, for eliminating carbide, steel is heated to austenitic area temperature (1050-1100 DEG C, tiny or thick depending on carbide in steel) and be incubated for some time (every 25mm wall thickness insulation 1h), carbide in as-cast structure is all solidly soluted in austenite substantially, then quench in water, thus obtain single austenite structure; In order to improve initial hardness and the intensity of material further, ageing treatment need be carried out; From supersaturated solid solution, separate out many very tiny precipitate particles (being generally metallic compound, also may be that the solute atoms in supersaturated solid solution is assembled in many small areas), form the solute atoms enrichment region that some volumes are very little.
Fig. 2 is the metallographic structure figure of material after water-tenacity treatment.As seen from the figure, microtexture is desirable single austenite structure, is conducive to the toughness and the plasticity that ensure material; After a step carries out ageing treatment again, initial hardness and intensity are improved in the basis exceeding sacrifice toughness, thus improve wear resistance and the work-ing life of material.
Fig. 3 is the scanned photograph of material after ageing treatment and the energy spectrum analysis of separating out tiny carbide.After ageing treatment, tiny precipitate is separated out in austenitic matrix, and is uniformly distributed, and plays precipitation strength, thus improves initial hardness and the intensity of material.From energy spectrum analysis, this precipitate short range order is the carbide of ferrimanganic aluminium.
Claims (9)
1. a crusher lightweight high manganese steel lining plate, it is characterized in that, liner plate chemical composition mass percent is: 1.0% ~ 1.5%C, 0.3% ~ 0.5%Si, 18% ~ 26%Mn, 6% ~ 8%Al, 0.002% ~ 0.005%B, 0.01% ~ 0.03% La and Ce mixed rare earth, P<0.01%, S<0.03%, surplus is Fe and inevitable impurity, and liner plate density is at 6.6 ~ 7.1g/cm
3between.
2., for a preparation method for crusher lightweight high manganese steel lining plate according to claim 1, it is characterized in that step is as follows:
(1) in medium-frequency induction furnace, carry out melting, add Al when liquid steel temperature to 1500 ~ 1550 DEG C, before tapping, 10min first adds Ca, stirs, Ca is evenly distributed after adding Ca with airway blowing argon gas; Then the rare earth alterative of preheating added molten steel and carry out modification, after adding rare earth, blowing argon gas stirs, remove the gred; Then 1530 ~ 1580 DEG C by molten steel down in ladle, prepare casting;
(2) being down to 1420 ~ 1460 DEG C when temperature is poured in sand mold mould die cavity, and casting duration is no more than 10min;
(3) when cast(ing) surface temperature is no more than 400 DEG C, foundry goods is carried out be separated, refine;
(4) thermal treatment: use can accurately control rate of heating, temperature, soaking time electric furnace foundry goods is heat-treated, be heated in the temperature range of 550 ~ 650 DEG C with 60 ~ 80 DEG C/h rate of heating from normal temperature, soaking time is determined, insulation 1 ~ 2h with the maximum thickness of liner plate; Rate of heating brings up to 150 ~ 200 DEG C/h afterwards, until water-quenched slag 1050 ~ 1080 DEG C, determines soaking time with the maximum thickness of liner plate, insulation 2 ~ 4h; After insulation, rapid pull-out from stove by foundry goods is dropped in water, and water temperature controls at 15 ~ 30 DEG C, quenching end of a period water temperature < 50 DEG C;
(5) shot peening: the significant parameter of shot-blast process is air pressure 0.15 ~ 0.20MPa, the cast steel 30 ball-type bullet of diameter 0.2mm, jet angle 80 ~ 90 °, jet length 120 ~ 140mm, bullet flow 6 ~ 8kg/min, shot peening time < 30min.
3. the preparation method of crusher lightweight high manganese steel lining plate according to claim 2, is characterized in that: after water-tenacity treatment, then at 500 ~ 550 DEG C of high tempering 2.5h ~ 5h, determines soaking time, take out air cooling afterwards with the maximum thickness of liner plate.
4. the preparation method of lightweight high manganese steel lining plate of the crusher according to Claims 2 or 3, is characterized in that: the described temperature adding Al is 1530 DEG C.
5. the preparation method of lightweight high manganese steel lining plate of the crusher according to Claims 2 or 3, is characterized in that: described alterant is Y based heavy rare earths alterant, and its particle size is less than 11mm, through 150 ~ 180 DEG C of baking preheating gained; Metamorphism treatment adopts in bag and pours method.
6. the preparation method of lightweight high manganese steel lining plate of the crusher according to Claims 2 or 3, is characterized in that: described tapping temperature is 1560 DEG C.
7. the preparation method of lightweight high manganese steel lining plate of the crusher according to Claims 2 or 3, is characterized in that: described teeming temperature is 1440 DEG C.
8. the preparation method of lightweight high manganese steel lining plate of the crusher according to Claims 2 or 3, it is characterized in that: described liner plate thickness is 75 ~ 100mm, the rate of heating being heated to 550 ~ 650 DEG C from normal temperature in thermal treatment is 70 DEG C/h, to 1050 ~ 1080 DEG C of rate of heating, 180 DEG C/h, quenching millpond volume>=400m
3, inside, pond is furnished with cycle of higher pressure water system, after water-tenacity treatment, then at 550 DEG C of high tempering 3h.
9. the preparation method of lightweight high manganese steel lining plate of the crusher according to Claims 2 or 3, is characterized in that: the significant parameter of shot-blast process is air pressure 0.18MPa, the cast steel 30 ball-type bullet of diameter 0.2mm, jet angle 85 °, jet length 130mm, bullet flow 7kg/min, shot peening time 20min.
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Address after: 114001 Anshan District, Liaoning, No. 219 Road, No. 39, Tiedong Applicant after: Anshan Iron and Steel Group Mining Co., Ltd. Address before: 114001 Anshan District, Liaoning, No. 219 Road, No. 39, Tiedong Applicant before: Anshan Iron & Steel Group Mining Co., Ltd. |
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| COR | Change of bibliographic data | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |