CN101988173B - Cast steel material and preparation method thereof - Google Patents
Cast steel material and preparation method thereof Download PDFInfo
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- CN101988173B CN101988173B CN 200910065604 CN200910065604A CN101988173B CN 101988173 B CN101988173 B CN 101988173B CN 200910065604 CN200910065604 CN 200910065604 CN 200910065604 A CN200910065604 A CN 200910065604A CN 101988173 B CN101988173 B CN 101988173B
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Abstract
The invention relates to a cast steel material which particularly comprises the following chemical ingredients: 0.2wt% to 0.23wt% of C, 1.3wt% to 1.5wt% of Mn, 0.6wt% to 0.7 wt% of Si, 0.18wt% of Ti, at most 0.2wt% of RE, at most 0.035 wt% of S, at most 0.035 wt% of P and the balance of iron elements. The ZG25Mn2TiRE cast steel material has the performance that the tensile strength reaches 500 to 735 MPa, the bending strength reaches 310 and 460 MPa, the extending rate reaches 20 to 33 percent, the cross section contraction rate reaches 45 and 56 percent, and the hardness reaches 170 to 207 HB. In the invention, the crystal grain refining and the precipitation reinforcing can be realized through the titanium element, the intensity of the cast steel is improved, crystal grains are refined and the form and the distribution of nonmetal impurities can be improved through rare earth elements RE, and the toughness of the steel and the welding performance of the cast steel are improved. When the intensity is improved through the normalizing treatment, the plasticity and the toughness of the steel materials can be properly improved for reaching the optimum integrated performance.
Description
Technical field
The present invention relates to cast steel material, particularly relate to a kind of normalized steel material and preparation method thereof.
Background technology
At present, the colliery industry all adopts steel casting with some component such as column-fossa, connecting joint class, guide rail on the hydraulic support.Because support will bear the alternating shock load that falls to causing from the vertical pressure of top board and a large amount of coal, stone in when work, therefore requires the column-fossa steel casting will have preferably comprehensive mechanical performance and well welding property.
Usually, column-fossa, connecting joint type component are often selected the ZG270-500 material, its comprehensive mechanical performance can meet the demands basically, but owing to will pass through modified thermal treatment after the casting, the crackle tendency is very large, is difficult for producing the sound steel castings of stable performance, and quenched and tempered steel needs to take the long production cycle in process of production, comprehensive cost is high, and this and the requirement tight, that reduce cost of coal machine enterprise production task produce contradiction.So, consider to replace quenched and tempered steel with normalized steel, shorten the production cycle, reduce comprehensive cost, have important Research Significance.
So-called normalized steel refers on the basis of solution strengthening, further improves a class low-alloy high-strength steel of intensity and assurance toughness by precipitation strength and refined crystalline strengthening.ZG25Mn2 is a kind of typical normalizing cast steel of China, because it has preferably weldability and good comprehensive mechanical performance, is widely used in the pressurized vessel manufacture view.But be used for the steel casting of hydraulic support, its tensile strength and yield strength are somewhat on the low side, and unit elongation and relative reduction in area also have a certain distance.
Summary of the invention
The object of the present invention is to provide ZG25Mn2TiRE cast steel material of a kind of low cost, good comprehensive mechanical performance and welding property and preparation method thereof.
Adopt for achieving the above object following technical proposals: a kind of cast steel material, its concrete chemical ingredients (% by weight) is: C 0.2-0.23, Mn 1.3-1.5, Si 0.6-0.7, Ti 0.18, RE≤0.2, S≤0.035, P≤0.035, all the other are ferro element, the performance of this cast steel material is that tensile strength reaches 500～735MPa, yield strength reaches 310～460MPa, unit elongation reaches 20～33%, and relative reduction in area reaches 45～56%, and hardness reaches 170～207HB.
The preparation method of described cast steel material comprises following smelting, cast and normalizing treatment technological process, and its concrete steps are:
(1) smelting technology
In the smelting molten steel process, ladle molten steel fusing 1/3～2/3 o'clock, put into silicon alloy, manganese alloy, titanium alloy, adjust chemical ingredients, before molten steel is come out of the stove, added rare earth ferrosilicon alloy in 3～10 minutes, mix, fully then fusing drops into the reductor purify hot metal;
(2) pouring technology
The tapping temperature of molten steel is 1680～1700 ℃, begins cast after calm 1-3 minute until molten steel in casting ladle, and teeming temperature is controlled at 1580～1620 ℃;
(3) normalizing process
Behind the casting, foundry goods will carry out normalizing treatment, and normalizing temperature is 840 ℃～880 ℃, and air cooling scatters behind the insulation appropriate time.
Described reductor is commercial-purity aluminium.
Described best normalizing temperature is 860 ℃.
The soaking time t of described normalizing calculates according to following experimental formula: t=α kD, wherein, α-heating coefficient, k-packing factor, D-workpiece net thickness.
Described α-heating coefficient is 0.7～0.8min/mm; The k-packing factor is: 1.0-1.5.
The present invention has added element ti and RE, and replaces modifier treatment with normalizing treatment.Wherein but carbide titanium crystal grain thinning and precipitation strength significantly improve cast steel intensity; But rare earth elements RE is crystal grain thinning and improve form and the distribution of non-metallic inclusion then, significantly improves the toughness of steel and improves the welding property of steel.And the purpose of normalizing is in order to make these alloying elements can be with tiny compound particle Precipitation from sosoloid, and play simultaneously the effect of crystal grain thinning, carrying the high-intensity while, suitably improving plasticity and the toughness of steel, to reach best over-all properties.
The ZG25Mn2TiRE cast steel material that the employing invention is produced through the metallographic structure of gained after the normalizing is: perlite synusia group+ferrite.Perlite synusia group such as is at the axle shape, and size is tiny and be evenly distributed, as shown in Figure 1; Ferrite is then to wait axle shape and strip form to exist, as shown in Figure 2; Both grain fineness numbers all reach (about 15 μ m) more than 9 grades.
By test, as shown in table 1 with the mechanical property contrast of existing ZG270-500 and ZG25Mn2 according to the normalized steel ZG25Mn2TiRE that the present invention produces, in addition, also the normalized steel ZG25Mn2TiRE of the present invention's production carried out the welding property test, see Table 2.
Table 1
| Material mark | Tensile strength (MPa) | Yield strength (MPa) | Unit elongation (%) | Relative reduction in area (%) | Hardness (HB) |
| ZG25Mn2TiRE | 735 | 460 | 33 | 56 | 207 |
| ZG25Mn2 | 590～685 | 345～440 | 20～30 | 45～55 | 200～250 |
| ZG270-500 | 500 | 270 | 18 | 25 | 180 |
Table 2
| The crackle kind | The surface crack rate | The section crack rate |
| Numerical value | 0％ | 0％ |
Correlation data can be found out from table 1, and cast steel ZG25Mn2TiRE material hardness and existing bi-material that the present invention produces are more or less the same, but mechanical property is significantly improved.As can be seen from Table 2, after normalizing treatment, the ZG25Mn2TiRE welding property is good.
At last, pour into needling with ZG25Mn2TiRE and produce checking and cost analysis at ZF4000/16/28 and ZY6000/14/33 hydraulic support, the needling part as shown in Figure 3.Cost analysis shows that ZG25Mn2TiRE compares with ZG270-500, and product material cost per ton has increased by 170 yuan, and production cost has reduced by 350 yuan, and comprehensive cost has descended 180 yuan, and the production cycle shortened about 4 hours simultaneously.
In sum, the cast steel ZG25Mn2TiRE that the present invention produces has preferably comprehensive mechanical performance, good welding property, with short production cycle, low cost and other advantages, can satisfy the service requirements of hydraulic support cast steel material fully.
Description of drawings
Fig. 1 is the metallographic structure figure of perlite synusia group after the present invention's ZG25Mn2TiRE cast steel material normalizing of producing;
Fig. 2 is the ferrite metallographic structure figure after the present invention's ZG25Mn2TiRE cast steel material normalizing of producing.
Embodiment
Embodiment 1
A kind of cast steel material, concrete chemical ingredients (% by weight) is: C 0.2-0.23, Mn 1.3-1.5, Si 0.6-0.7, Ti 0.18, RE≤0.2, S≤0.035, P≤0.035, all the other are ferro element, the cast steel material performance is that tensile strength reaches 735MPa, yield strength reaches 460MPa, unit elongation reaches 33%, and relative reduction in area reaches 56%, and hardness reaches 207HB.
The preparation method of cast steel material comprises that following smelting, cast and normalizing treatment technological process are:
(1) smelting technology
In the smelting molten steel process, ladle molten steel fusing 1/3～2/3 o'clock, put into silicon alloy, manganese alloy, titanium alloy, adjust chemical ingredients, before molten steel is come out of the stove, added rare earth ferrosilicon alloy in 3～10 minutes, mix, fully then fusing drops into the reductor purify hot metal.
(2) pouring technology
The tapping temperature of molten steel is 1680～1700 ℃, begins cast after calm 1-3 minute until molten steel in casting ladle, and teeming temperature is controlled at 1580～1620 ℃.
(3) normalizing process
Behind the casting, foundry goods will carry out normalizing treatment, and normalizing temperature is 840 ℃～880 ℃, and air cooling scatters behind the insulation appropriate time.
Embodiment 2
A kind of cast steel material, concrete chemical ingredients (% by weight) is: C 0.22, and Mn 1.3, and Si 0.7, and Ti 0.18, and RE 0.05, and S 0.005, P0.025, all the other are ferro element,
The preparation method of cast steel material comprises that following smelting, cast and normalizing treatment technological process are:
(1) smelting technology
In the smelting molten steel process, ladle molten steel fusing 1/3～2/3 o'clock, put into silicon alloy, manganese alloy, titanium alloy is adjusted chemical ingredients, and 3～10 minutes rare earth ferrosilicon alloys mix before molten steel is come out of the stove, and fully then fusing drops into the commercial-purity aluminium purify hot metal.
(2) pouring technology
The tapping temperature of molten steel is 1680～1700 ℃, begins cast after calm 1-3 minute until molten steel in casting ladle, and teeming temperature is controlled at 1580～1620 ℃.
(3) normalizing process
Behind the casting, foundry goods will carry out normalizing treatment, and normalizing temperature is 860 ℃, the air cooling that scatters behind the insulation appropriate time, and the soaking time t of normalizing calculates according to following experimental formula: t=α kD, wherein, α-heating coefficient, k-packing factor, D-workpiece net thickness.
Described α-heating coefficient is 0.7～0.8min/mm; The k-packing factor is: 1.0-1.5.
Embodiment 3
A kind of cast steel material, its concrete chemical ingredients (% by weight) is: C 0.22, and Mn 1.4, and Si 0.6, and Ti 0.18, and RE 0.15, and S 0.005, and P 0.03, and all the other are ferro element.
The preparation method of described cast steel comprises following smelting, cast and normalizing treatment technological process, it is characterized in that:
(1) smelting technology
Steelmaking feed selects sulphur, phosphorus content at the steel scrap below 0.045%, such as Q550, Q460 and Q345 etc., optimizes the cast steel composition.
Melted 1/2 o'clock at the ladle molten steel, the trade mark is the ferrosilicon of FeSi90Al13, the trade mark is the electric furnace ferromanganese of FeMn84C0.4, the trade mark is the ferrotianium of FeTi30-A, adjust chemical ingredients, 3 minutes adding trades mark are the rare earth ferrosilicon of FeSiRE26 before molten steel is come out of the stove, and mix, fully then fusing drops into the reductor purify hot metal.
(2) pouring technology
The tapping temperature of molten steel is 1700 ℃, begins cast after calm 1 minute until molten steel in casting ladle, and teeming temperature is controlled at 1620 ℃.
(3) normalizing process
Behind the casting, foundry goods will carry out normalizing treatment, and normalizing temperature is 880 ℃, when the net thickness D of needling gets 220mm, and the soaking time air cooling that scatters after 185 minutes.
Used ferrosilicon, electric furnace ferromanganese, ferrotianium and rare earth ferrosilicon are the standard alloy of purchasing in market among the embodiment 3, and its chemical ingredients is as follows respectively:
The trade mark of used ferrosilicon and chemical ingredients (wt%) among table 3 embodiment 3
The trade mark of used electric furnace ferromanganese and chemical ingredients (wt%) among table 4 embodiment 3
The trade mark of used ferrotianium and chemical ingredients (wt%) among table 5 embodiment 3
The trade mark of used rare earth ferrosilicon and chemical ingredients (wt%) among table 6 embodiment 3
Embodiment 4
A kind of cast steel material, the mass percent of its contained element consists of: C 0.2, Si 0.62, Mn 1.36, Ti 0.15, RE 0.18, S 0.03, P 0.029, all the other are ferro element.
Its preparation method comprises following smelting, cast and normalizing treatment technological process, and specific embodiment is:
(1) smelting technology
According to the chemical ingredients scope of giving, choose sulphur, phosphorus content is smelted as raw material at the Q460 steel scrap below 0.045%.Melted 1/3 o'clock at the ladle molten steel, put into ferrosilicon, ferromanganese, ferrotianium, adjust chemical ingredients, 10 minutes adding rare earth ferrosilicons before molten steel is come out of the stove, mix, then fully fusing drops into 0.1% commercial-purity aluminium (purity＞99.99%) purify hot metal that accounts for the alloy total amount.
Described ferrosilicon, ferromanganese, ferrotianium, rare earth ferrosilicon are the standard alloy of purchasing in market, its chemical ingredients enters table 7,8,9,10, the weight of the required ferrosilicon of described production cast steel material ZG25Mn2TiRE, ferromanganese, ferrotianium, rare earth ferrosilicon is calculated by the chemical ingredients of ferrosilicon, ferromanganese, ferrotianium, rare earth ferrosilicon in the table 7,8,9,10.
(2) pouring technology
The tapping temperature of molten steel is 1680 ℃, begins cast after calm 3 minutes until molten steel in casting ladle, pours into needling under 1580 ℃, and the physical dimension of foundry goods is 280mm * 430mm * 200mm.
(3) normalizing process
Behind the casting, needling carries out normalizing thermal treatment, and normalizing temperature is 840 ℃, is incubated the air cooling that scatters after 2 hours 20 minutes.T=α kD, α-heating coefficient is: 0.7min/mm; The k-packing factor is generally: 1.0; D-is the net thickness 200mm of needling.
Make cast steel product of the present invention, the mechanical property of foundry goods is: tensile strength 700MPa, and yield strength 450MPa, unit elongation 32%, relative reduction in area 56%, hardness 206HB, the crackle rate that the welding property test obtains is 0%.
This product any quality accident do not occur after the user uses three months.
Embodiment 5
A kind of cast steel material, its concrete chemical ingredients (% by weight) is: C 0.2, and Mn 1.3, and Si 0.6, and Ti 0.18, and RE 0.1, and S 0.025, P0.025, all the other are ferro element.
Its preparation method comprises following smelting, cast and normalizing treatment technological process, and specific embodiment is:
(1) smelting technology
According to the chemical ingredients scope of giving, choose sulphur, phosphorus content is smelted as raw material at the Q550 steel scrap below 0.045%.Melted 2/3 o'clock at the ladle molten steel, put into ferrosilicon, ferromanganese, ferrotianium, adjust chemical ingredients, 5 minutes adding rare earth ferrosilicons before molten steel is come out of the stove, mix, then fully fusing drops into 0.08% commercial-purity aluminium (purity＞99.99%) purify hot metal that accounts for the alloy total amount.
Described ferrosilicon, ferromanganese, ferrotianium, rare earth ferrosilicon are the standard alloy of purchasing in market, its chemical ingredients enters table 7,8,9,10, the weight of the required ferrosilicon of described production cast steel material ZG25Mn2TiRE, ferromanganese, ferrotianium, rare earth ferrosilicon is calculated by the chemical ingredients of ferrosilicon, ferromanganese, ferrotianium, rare earth ferrosilicon in the table 7,8,9,10.
(2) pouring technology
The tapping temperature of molten steel is 1690 ℃, begins cast after calm 3 minutes until molten steel in casting ladle, pours into needling under 1600 ℃, and the physical dimension of foundry goods is 300mm * 440mm * 240mm.
(3) normalizing process
Behind the casting, needling carries out normalizing thermal treatment, and normalizing temperature is 860 ℃, is incubated the air cooling that scatters after 288 minutes.T=α kD, α-heating coefficient is: 0.8min/mm; The k-packing factor is generally: 1.5; D-is the net thickness 240mm of needling.
Make cast steel product of the present invention, the mechanical property of foundry goods is: tensile strength 725MPa, and yield strength 455MPa, unit elongation 33%, relative reduction in area 55%, hardness 205HB, the crackle rate that the welding property test obtains is 0%.
This product any quality accident do not occur after the user uses three months.
Embodiment 6
A kind of cast steel material, its concrete chemical ingredients (% by weight) is: C 0.23, and Mn 1.5, and Si 0.7, and Ti 0.18, and RE 0.2, and S 0.035, P0.035, all the other are ferro element.
Its preparation method is with embodiment 2.
Embodiment 7
A kind of cast steel material and preparation method thereof, its concrete chemical ingredients (% by weight) is: C 0.215, and Mn 1.35, and Si 0.68, and Ti 0.18, RE0.01, S 0.03, and P 0.015, and all the other are ferro element.
Its preparation method is with embodiment 2.
The table 7 ferrosilicon trade mark
The table 8 ferromanganese trade mark
The table 9 ferrotianium trade mark
The table 10 rare earth ferrosilicon alloy trade mark
Claims (4)
1. a cast steel material is characterized in that concrete chemical ingredients (% by weight) is: C 0.2-0.23, Mn 1.3-1.5, Si 0.6-0.7, Ti 0.18, RE≤0.2, S≤0.035, P≤0.035, all the other are ferro element, the performance of this cast steel material is that tensile strength reaches 500～735MPa, yield strength reaches 310～460MPa, unit elongation reaches 20～33%, and relative reduction in area reaches 45～56%, and hardness reaches 170～207HB.
2. the preparation method of described cast steel material according to claim 1 comprises following smelting, cast and normalizing treatment technological process, it is characterized in that:
(1) smelting technology
In the smelting molten steel process, ladle molten steel fusing 1/3～2/3 o'clock, put into silicon alloy, manganese alloy, titanium alloy, adjust chemical ingredients, before molten steel is come out of the stove, added rare earth ferrosilicon alloy in 3～10 minutes, mix, fully then fusing drops into the reductor purify hot metal;
(2) pouring technology
The tapping temperature of molten steel is 1680～1700 ℃, begins cast after calm 1-3 minute until molten steel in casting ladle, and teeming temperature is controlled at 1580～1620 ℃;
(3) normalizing process
Behind the casting, foundry goods will carry out normalizing treatment, and normalizing temperature is 840 ℃～880 ℃, and air cooling scatters behind the insulation appropriate time.
3. the preparation method of described cast steel material according to claim 2, it is characterized in that: reductor is commercial-purity aluminium.
4. the preparation method of described cast steel material according to claim 2, it is characterized in that: normalizing temperature is 860 ℃.
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| CN 200910065604 CN101988173B (en) | 2009-07-30 | 2009-07-30 | Cast steel material and preparation method thereof |
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| CN 200910065604 CN101988173B (en) | 2009-07-30 | 2009-07-30 | Cast steel material and preparation method thereof |
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| CN101988173B true CN101988173B (en) | 2013-01-23 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102352465B (en) * | 2011-08-03 | 2013-04-24 | 郑州四维机电设备制造有限公司 | Superhigh strength cast steel, and preparation method and welding process thereof |
| CN102296246B (en) * | 2011-08-03 | 2013-05-01 | 郑州四维机电设备制造有限公司 | Ultrahigh strength cast steel and preparation method as well as welding process thereof |
| CN102352467B (en) * | 2011-08-03 | 2012-10-31 | 郑州四维机电设备制造有限公司 | Superhigh strength cast steel, and preparation method and welding process thereof |
| CN102703825A (en) * | 2012-06-12 | 2012-10-03 | 唐海峰 | Preparation method of improved 30CrMnSi steel |
| CN102978538B (en) * | 2012-10-26 | 2014-07-30 | 河北钢铁股份有限公司承德分公司 | Smelting process for production of grade II hot-rolled reinforced bar |
| CN106772316A (en) * | 2017-01-17 | 2017-05-31 | 中国北方车辆研究所 | A kind of single line laser radar containment vessel |
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| CN1498282A (en) * | 2001-03-23 | 2004-05-19 | ס�ѽ�����ҵ��ʽ���� | Cast steel and metal mold for casting |
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Patent Citations (3)
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|---|---|---|---|---|
| CN1498282A (en) * | 2001-03-23 | 2004-05-19 | ס�ѽ�����ҵ��ʽ���� | Cast steel and metal mold for casting |
| CN1560311A (en) * | 2004-02-27 | 2005-01-05 | 天津工程机械研究院 | Wear-resisting cast steel and preparation method thereof |
| CN1876879A (en) * | 2006-06-28 | 2006-12-13 | 宁波浙东精密铸造有限公司 | Micro-alloy weldable cast steel tooth stand and preparation method thereof |
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