CN103849818A - Wear-resisting cast steel and preparation method thereof - Google Patents
Wear-resisting cast steel and preparation method thereof Download PDFInfo
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- CN103849818A CN103849818A CN201410080923.2A CN201410080923A CN103849818A CN 103849818 A CN103849818 A CN 103849818A CN 201410080923 A CN201410080923 A CN 201410080923A CN 103849818 A CN103849818 A CN 103849818A
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Abstract
The invention discloses wear-resisting cast steel and a preparation method thereof, belonging to the technical field of wear-resisting cast steel, for mainly solving the problems that the conventional double-metal bent tube is instable in preparation process, hard to form and relatively high in cost. The wear-resisting cast steel is mainly characterized by comprising the following chemical components in percentage by weight: 0.25-0.8% of C, 0.5-1.5% of Si, 0.5-1.5% of Mn, 0.3-0.8% of Cu, 0.5-2.5% of Cr, 0.02-0.5% of B, 0.1-0.5% of rare earth yttrium, less than or equal to 0.03% S and P and the balance of Fe. The preparation method comprises the following steps: finally casting to from the steel at the casting temperature being not lower than 1500 DEG C, heating a cast piece in a thermal treatment furnace, carrying out temperature preservation treatment when the temperature is 830-980 DEG C; after the temperature preservation, directly discharging the cast piece out of the furnace, quenching in air, subsequently carrying out tempering treatment twice, wherein water cooling is carried out after the first tempering and temperature preservation and air cooling is carried out after the second tempering and temperature preservation. The wear-resisting cast steel has the characteristics that the cost is relatively low, the production process is simple, the hardness is greater than 42HRC and the alpha k is greater than 15J/cm<2>, and the wear-resisting cast steel is mainly applied to materials such as cement pump bending tubes, excavator bucket teeth and the like.
Description
Technical field
The invention belongs to wearable cast steel technical field, be specifically related to a kind of wearable cast steel using and material preparation method thereof under shock action.This cast steel has advantages of that low production cost, manufacturing process are more simple and easy to control, long service life, is applicable to cement pump truck bend pipe and excavator bucket teeth material.Relate to especially, preparation material method.
Background technology
Current, along with the project implementation such as urban construction, road reformation, equipment cement pump truck for building almost spreads all over each city building, surprising as the consumption of the automobile-used middle bend pipe of cement pump, end bend pipe, causes the very big consumption of material, the energy.For this reason, the cement pump truck bend pipe that China produces take 31 heavy industry group companies as representative now adopts bimetal material (as the high-chromium alloy of overcoat as carbon steel/liner as high-wearing feature) to replace original single material, and has obtained good effect.Although it is wear-resistant that bimetal bend pipe shows comparatively ideal inside, the feature of outside high-ductility, preparation technology is unstable, the difficulty that is shaped, and cost is also higher.Replace bimetal material if develop a kind of material, embody higher cost performance, for improving the low problem of current home and abroad cement pump truck bend pipe cost performance, there is undoubtedly important construction value.In addition, for the fast development of river course silt particle cleaning, mining, road digging etc., excavator is equally also a difficult problem for puzzlement construction party by the problem of the life-span deficiency of bucket tooth, even some unit adopts the external high-end wear-resistant bucket tooth of import (as Low Alloying Multicomponent Steels) to use, and causes construction cost greatly to increase.If wear-resistant material is significant equally cheaply to develop one.Home and abroad is a lot of about the patent report of wear resistant alloy, and especially as Low Alloying Multicomponent Steels, control is organized substantially and is: martensite, horse bainite, bainite etc.In this patent, also will not enumerate about chemical composition and the thermal treatment process of reporting each patent.
Summary of the invention
Object of the present invention provides a kind of low cost wearable cast steel material and preparation method for above-mentioned weak point exactly, has that production cost is lower, technique is easy to control, the feature of long service life, is mainly used in the materials such as cement pump truck bend pipe, excavator bucket teeth.
In order to reach this object, the present invention is achieved by the following technical solutions: a kind of wearable cast steel, is characterized in that its chemical component weight per-cent is: C:0.25-0.8; Si:0.5-1.5; Mn:0.5-1.5; Cu:0.3-0.8; Cr:0.5-2.5; B:0.02-0.5; Rare-earth yttrium: 0.1-0.5; S, P≤0.03, all the other are Fe.
The method that the present invention prepares above-mentioned wearable cast steel is to it is characterized in that comprising the following steps:
1) according to chemical component weight per-cent claimed in claim 1: C:0.25-0.8, Si:0.5-1.5, Mn:0.5-1.5, Cu:0.3-0.8, Cr:0.5-2.5, B:0.02-0.5, rare-earth yttrium: 0.1-0.5, S, P≤0.03, all the other are Fe, calculate, weighing and burden: steel scrap, ferromanganese, ferrosilicon, ferrochrome, ferro-boron, copper rod or copper coin and granularity are at the rare earth of 5-10mm;
2) steel scrap is added in medium-frequency induction furnace molten clear after, after successively ferromanganese, ferrosilicon being added wait all to melt clearly, add ferrochrome further clearly molten again, scald bag with coming out of the stove after aluminium wire deoxidation treatment, ferro-boron, copper rod or copper coin are put into furnace bottom simultaneously, again molten steel added in stove and open electric furnace, when temperature of fusion reaches 1550-1650 ℃, be incubated after 1-2 minute, after again adopting aluminium wire deoxidation, come out of the stove, pouring bottom tiling places in the casting ladle of rare earth, teeming temperature is finally carried out castable for being not less than 1500 ℃, within after casting complete 3-5 hour, unpacks and takes out foundry goods;
3) heat up after foundry goods is put into heat treatment furnace, in the time that temperature arrives 830～980 ℃, be incubated processing; Be incubated the rear air quenching of directly coming out of the stove;
4) after air quenching, foundry goods need carry out double tempering processing, and tempering temperature, higher than tempering temperature for the second time, is carried out water-cooled by foundry goods after tempering has for the first time been incubated for the first time, and it is cold that tempering for the second time completes laggard line space in insulation.
Wearable cast steel in the present invention is not few containing noble metal element or noble metal constituent content, lower cost, and production technique is simple, and the hardness of the wearable cast steel that obtains is > 42HRC, α
k> 15J/cm
2, be applicable to make the materials such as cement pump truck bend pipe, excavator bucket teeth.
Embodiment
Below specific embodiments of the invention are described.
Embodiment 1:
1) main chemical compositions (weight percent) of determining wearable cast steel is: C:0.8; Si:0.5; Mn:0.5; Cu:0.3; Cr:2.5; B:0.02; Rare-earth yttrium: 0.5; S, P≤0.03, all the other are Fe;
2) calculate according to definite chemical composition, weighing and burden, by steel scrap add in medium-frequency induction furnace molten clear after, successively by ferromanganese, ferrosilicon adds ferrochrome further clearly molten again after adding wait all to melt clearly, scald bag with coming out of the stove after aluminium wire deoxidation treatment, ferro-boron and copper coin are put into furnace bottom simultaneously, again molten steel added in stove and open electric furnace, when temperature of fusion reaches 1550 ℃, be incubated after 1 minute, after again adopting aluminium wire deoxidation, come out of the stove, pouring bottom tiling places in the casting ladle of rare earth (granularity is in 10mm left and right), when being 1500 ℃, teeming temperature carries out castable, within after casting complete 5 hours, unpack and take out foundry goods,
3) heat up after foundry goods is put into heat treatment furnace, carry out with 150 ℃/h of heat-up rates, in the time that temperature arrives 980 ℃, be incubated processing in 1.5 hours (foundry goods thickest 2.5cm); Be incubated the rear air quenching of directly coming out of the stove; Then (temper temperature is 500 ℃ for the first time to carry out double tempering processing; Temper temperature is 200 ℃ for the second time), after tempering has for the first time been incubated, foundry goods is carried out to water-cooled, it is cold that tempering for the second time completes laggard line space in insulation.
Wear resisting steel lower cost in the present invention, production technique is simple, and the hardness of the wear resisting steel that obtains is: HRC49.3 (mean values of six data); α
k: 15.6J/cm
2(mean values of three data).
Adopt cement pump truck end bend pipe prepared by this embodiment 1 through about about 6-7 month on probation, show suitable with the life-span of Bending Pipes (liner is rich chromium cast iron, and overcoat is carbon steel), more than the low 25-35% of cost compare Bending Pipes; From Production Time statistics, the wearable cast steel required time of this patent exploitation can obviously shorten compared with composite-curve in addition.
Embodiment 2:
1) main chemical compositions (weight percent) of determining wearable cast steel is: C:0.25; Si:1.5; Mn:1.5; Cu:0.8; Cr:0.5; B:0.5; Rare-earth yttrium: 0.1; S, P≤0.03, all the other are Fe;
2) calculate according to definite chemical composition, weighing and burden, by steel scrap add in medium-frequency induction furnace molten clear after, successively by ferromanganese, ferrosilicon adds ferrochrome further clearly molten again after adding wait all to melt clearly, scald bag with coming out of the stove after aluminium wire deoxidation treatment, ferro-boron and copper coin are put into furnace bottom simultaneously, again molten steel added in stove and open electric furnace, when temperature of fusion reaches 1650 ℃, be incubated after 2 minutes, after again adopting aluminium wire deoxidation, come out of the stove, pouring bottom tiling places in the casting ladle of rare earth (granularity is in 10mm left and right), when being 1520 ℃, teeming temperature carries out castable, within after casting complete 3 hours, unpack and take out foundry goods,
3) heat up after foundry goods is put into heat treatment furnace, carry out with 300 ℃/h of heat-up rates, in the time that temperature arrives 830 ℃, be incubated processing in 3 hours (foundry goods thickest 6cm); Be incubated the rear air quenching of directly coming out of the stove; Then (temper temperature is 480 ℃ for the first time to carry out double tempering processing; Temper temperature is 250 ℃ for the second time), after tempering has for the first time been incubated, foundry goods is carried out to water-cooled, it is cold that tempering for the second time completes laggard line space in insulation.
Wear resisting steel lower cost in the present invention, production technique is simple, and the hardness of the wear resisting steel that obtains is: HRC43.5 (mean values of six data); α
k: 27.1J/cm
2(mean values of three data).
Adopt excavator bucket teeth prepared by this embodiment 2 about individual month, to show that its life-span is used original Low Alloying Multicomponent Steels life-span to improve more than 2 times through about 2-3 on probation.
Embodiment 3:
1) main chemical compositions (weight percent) of determining wearable cast steel is: C:0.42; Si:1.0; Mn:1.1; Cu:0.5; Cr:1.5; B:0.2; Rare-earth yttrium: 0.25; S, P≤0.03, all the other are Fe;
2) calculate according to definite chemical composition, weighing and burden, by steel scrap add in medium-frequency induction furnace molten clear after, successively by ferromanganese, ferrosilicon adds ferrochrome further clearly molten again after adding wait all to melt clearly, scald bag with coming out of the stove after aluminium wire deoxidation treatment, simultaneously by ferro-boron and or copper coin put into furnace bottom, again molten steel added in stove and open electric furnace, when temperature of fusion reaches 1600 ℃, be incubated after 1.5 minutes, after again adopting aluminium wire deoxidation, come out of the stove, pouring bottom tiling places in the casting ladle of rare earth (granularity is in 5mm left and right), when being 1500 ℃, teeming temperature carries out castable, within after casting complete 4 hours, unpack and take out foundry goods,
3) after being put into heat treatment furnace, foundry goods heats up, carry out with 200 ℃/h of heat-up rates, in the time that arriving 870 ℃, temperature is incubated processing (two class foundry goods are heat-treated simultaneously for trolley sawtooth casting thickest 4cm insulation 2 hours, bend pipe 3cm insulation 2 hours in the middle of cement pump truck); Be incubated the rear air quenching of directly coming out of the stove; Then (temper temperature is 450 ℃ for the first time to carry out double tempering processing; Temper temperature is 350 ℃ for the second time, and bend pipe and bucket tooth carry out tempering insulation simultaneously to be processed), after tempering has for the first time been incubated, foundry goods is carried out to water-cooled, it is cold that tempering has for the second time been incubated laggard line space.
Wear resisting steel lower cost in the present invention, production technique is simple, and the hardness of the wear resisting steel that obtains is: HRC46.5 (mean values of six data); α
k: 18.6J/cm
2(mean values of three data).
Adopt excavator bucket teeth prepared by this embodiment 3 approximately about 2 months, to show that its life-span is used original Low Alloying Multicomponent Steels life-span to improve more than 1.6 times through on probation.
In addition, adopt in the middle of the cement pump truck prepared of embodiment 3 bend pipe through on probation approximately about 10 months, show suitable with the life-span of Bending Pipes (liner is rich chromium cast iron, and overcoat is carbon steel), in the middle of cost compare bimetal is compound more than the low 20-30% of bend pipe.
In a word, in the present invention, low cost wear resisting steel makes high-abrasive material foundry goods by controlling suitable chemical composition, thermal treatment process etc., is applicable to make cement pump truck bend pipe, the materials such as excavator bucket teeth.
Claims (2)
1. a wearable cast steel, is characterized in that its chemical component weight per-cent is: C:0.25-0.8; Si:0.5-1.5; Mn:0.5-1.5; Cu:0.3-0.8; Cr:0.5-2.5; B:0.02-0.5; Rare-earth yttrium: 0.1-0.5; S, P≤0.03, all the other are Fe.
2. prepare a method for wearable cast steel claimed in claim 1, it is characterized in that comprising the following steps:
1) according to chemical component weight per-cent claimed in claim 1 calculate, weighing and burden: starting material are respectively the rare earth that steel scrap, ferromanganese, ferrosilicon, ferrochrome, ferro-boron, copper rod or copper coin and granularity are 5-10mm;
2) steel scrap is added in medium-frequency induction furnace molten clear after, after successively ferromanganese, ferrosilicon being added wait all to melt clearly, add ferrochrome further clearly molten again, scald bag with coming out of the stove after aluminium wire deoxidation treatment, ferro-boron, copper rod or copper coin are put into furnace bottom simultaneously, again molten steel added in stove and open electric furnace, when temperature of fusion reaches 1550-1650 ℃, be incubated after 1-2 minute, after again adopting aluminium wire deoxidation, come out of the stove, pouring bottom tiling places in the casting ladle of rare earth, teeming temperature is finally carried out castable for being not less than 1500 ℃, within after casting complete 3-5 hour, unpacks and takes out foundry goods;
3) heat up after foundry goods is put into heat treatment furnace, in the time that temperature arrives 830～980 ℃, be incubated processing; Be incubated the rear air quenching of directly coming out of the stove;
4) after air quenching, foundry goods need carry out double tempering processing, double tempering temperature is between 300-500 ℃, tempering temperature, higher than tempering temperature for the second time, is carried out water-cooled by foundry goods after tempering has for the first time been incubated for the first time, and it is cold that tempering for the second time completes laggard line space in insulation.
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| CN201410080923.2A CN103849818B (en) | 2014-03-07 | 2014-03-07 | A kind of wearable cast steel and preparation method thereof |
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| CN103849818A true CN103849818A (en) | 2014-06-11 |
| CN103849818B CN103849818B (en) | 2016-01-13 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105821312A (en) * | 2016-03-23 | 2016-08-03 | 北京科技大学 | Lining plate for low-carbon and medium-alloy wet ball mill and preparation method thereof |
| CN111334724A (en) * | 2020-03-12 | 2020-06-26 | 海安海太铸造有限公司 | Polymorphic high-degree deoxidation casting method for microalloyed rare earth cast steel |
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| CN1775983A (en) * | 2005-12-09 | 2006-05-24 | 长沙理工大学 | High-strength casted air-colled bainite wear-resisting steel and preparing method |
| CN1834279A (en) * | 2006-04-13 | 2006-09-20 | 西安交通大学 | Boron contg. multi-element low alloyed wearable cast steel and prepn. thereof |
| CN102367558A (en) * | 2011-10-24 | 2012-03-07 | 山东双轮股份有限公司 | Boric low alloy wear resistant steel for pump |
| CN103436892A (en) * | 2013-07-13 | 2013-12-11 | 瞿立双 | Preparation method for abrasion-resistant gear with alloy steel on surface |
-
2014
- 2014-03-07 CN CN201410080923.2A patent/CN103849818B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1775983A (en) * | 2005-12-09 | 2006-05-24 | 长沙理工大学 | High-strength casted air-colled bainite wear-resisting steel and preparing method |
| CN1834279A (en) * | 2006-04-13 | 2006-09-20 | 西安交通大学 | Boron contg. multi-element low alloyed wearable cast steel and prepn. thereof |
| CN102367558A (en) * | 2011-10-24 | 2012-03-07 | 山东双轮股份有限公司 | Boric low alloy wear resistant steel for pump |
| CN103436892A (en) * | 2013-07-13 | 2013-12-11 | 瞿立双 | Preparation method for abrasion-resistant gear with alloy steel on surface |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105821312A (en) * | 2016-03-23 | 2016-08-03 | 北京科技大学 | Lining plate for low-carbon and medium-alloy wet ball mill and preparation method thereof |
| CN111334724A (en) * | 2020-03-12 | 2020-06-26 | 海安海太铸造有限公司 | Polymorphic high-degree deoxidation casting method for microalloyed rare earth cast steel |
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| CN103849818B (en) | 2016-01-13 |
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Granted publication date: 20160113 |