CN102649151A - Dummy head for continuous casting steel and manufacturing method thereof - Google Patents
Dummy head for continuous casting steel and manufacturing method thereof Download PDFInfo
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- CN102649151A CN102649151A CN201210177145XA CN201210177145A CN102649151A CN 102649151 A CN102649151 A CN 102649151A CN 201210177145X A CN201210177145X A CN 201210177145XA CN 201210177145 A CN201210177145 A CN 201210177145A CN 102649151 A CN102649151 A CN 102649151A
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Abstract
The invention relates to a dummy head for continuous casting steel and a manufacturing method thereof. The dummy head comprises the following components in percentage by weight: 0.08-0.15 percent of C, 0.15-0.14 percent of Si, 0.4-0.7 percent of Mn, less than or equal to 0.030 percent of P, more than or equal to 0.030 percent of S, 0.9-1.2 percent of Cr, 0.35-0.60 percent of Mo, 0.15-0.30 percent of V and the balance of Fe and inevitable impurities. The manufacturing method of the dummy head comprises the following steps of: 1) smelting, casting and rolling according to the components and forming; 2) carrying out heat treatment, normalizing and tempering at a high temperature, wherein the normalizing temperature is 950-1050 DEG C, and the tempering temperature is 600-750 DEG C; and 3) machining to obtain the dummy head required to be suitable for continuous casting production. The dummy head has the beneficial effects that the thermal fatigue resistance of the dummy head can be improved, so that not only can the smooth production logistics be ensured, but also the rejection rate of the dummy head can be reduced, thereby achieving the purpose of the reducing the cost and increasing the benefit.
Description
Technical field
The present invention relates to the continuous casting steel machine technology, particularly a kind of continuous casting steel dummy bar head and manufacturing approach thereof.
Background technology
Dummy bar head is all used in the continuous casting zone in a large number widely, no matter be our department of Baogang Stocks Trading Co. steel mill or other steel mills.In continuous casting zone, when open water after, after dummy bar head hauls strand and comes out; Need in time dummy bar to be spun off from strand, watering one hour the process of taking off ingot from opening, the grooved working face of dummy bar head successively receives the heat effect of high temperature strand and strong water-cooled effect in short-term; Through the recycling of several times, improper if material is selected for use, and in to dummy bar head manufacturing process without proper heat treatment; The be full of cracks of splitting of heat fatigue can appear in the grooved working face of dummy bar head; When the degree of depth of crackle during greater than 10mm, dummy bar head just can safe throwing, can directly influence safety yet and take off ingot.
The accident that dummy bar head comes off and fails from strand takes place in steel plant continuous casting operation often, can cause water unusual end when serious.The reason of discovering dummy ingot failure many times is owing to the material of dummy bar and heat treated design is unreasonable causes.
The material of dummy bar mainly is the 20MnMo through modifier treatment, and its composition is: C0.17-0.23%, Si 0.17-0.37%, Mn 1.1-1.4%; Mo 0.2-0.35%, Ni≤0.30%, Cr≤0.30%, P≤0.025%; S≤0.015%, Cu≤0.25%, all the other are Fe.And only be modifier treatment, so serviceability temperature is lower, maximum heat resisting temperature is 470 ℃.But the maximum in short-term operating temperature of dummy bar head can reach 500-600 ℃.Behind the dummy ingot of casting for several times, will find has the erosion gap of the be full of cracks and the thermal shock of heat fatigue on the flute profile working face of the present this 20MnMo dummy bar head that uses.After these be full of cracks gap acquired a certain degree, the dummy ingot failure will take place.Above shortcoming often exposes in the actual production operation process, is can not stablize the dummy bar head that takes off ingot to bring reparation out according to processing method in the past, just scraps the dummy bar head that more renews again after can not repairing.So not only reduce production efficiency, improved production cost, cause adverse influence for the logistics of producing.
Summary of the invention
The object of the present invention is to provide a kind of continuous casting steel dummy bar head and manufacturing approach thereof, can improve the performance of dummy bar head thermal fatigue resistance, not only can guarantee the smooth and easy of production logistics, and can reduce the useless rate of guarantor of dummy bar head.
For achieving the above object, technical scheme of the present invention is:
A kind of continuous casting steel dummy bar head, its composition percentage by weight is: C 0.08 ~ 0.15%, Si0.15 ~ 0.14%, Mn 0.4 ~ 0.7%; P≤0.030%, S≤0.030%, Cr 0.9 ~ 1.2%; Mo0.35 ~ 0.60%, V 0.15 ~ 0.30%, and all the other are Fe and inevitable impurity.
Wherein, mainly be the content that reduces C, the first guarantees that in the material mainly be a large amount of ferrite and pearlite.The ferrite fusing point is high, so have heat-resisting performance.Graphitization does not take place because carbon is low in pearlite, can guarantee the silver ingot head in the middle of work, keeps the stable of tissue.Just because of ferritic hear resistance and pearlitic stability, hear resistance and intensity can guaranteed.It two is to improve solution strengthening.
Wherein, the adding content of Cr can improve dummy ingot heat resistance and recrystallization temperature about 1.0%.The content of Mo is controlled at about 0.5%.The content of V is controlled at about 0.2%.
In the composition design of the present invention, a large amount of heat-resisting ferrites is arranged in the matrix, carbide is less, and the pearlite in the steel is not easy to take place nodularization, and graphitization does not take place the cementite in the pearlite yet, all helps tissue and keeps stable.Utilize these characteristics of pearlite of this steel grade, and more resistant to elevated temperatures ferrite stability characteristic (quality), thereby good heat-resistant obtained.
For this steel grade, in order to realize solution strengthening, being added into main alloying element has Cr and Mo, and auxilliary added elements is V, Ti, Nb, W etc.Carry out solution strengthening through these elements, greatly improve steel heat resistance can with the temperature of crystallization again, particularly when Cr 1%, Mo can obviously improve the heat resistance of steel at 0.5% o'clock.The another one effect of Cr, Mo, V element is the quenching degree that improves steel.
Low-carbon (LC) pearlite type refractory steel after the general shape through the dummy bar head of casting out, must adopt correct Technology for Heating Processing could obtain stable heat resistance after the composition design of strictness.This is second tangible characteristic of the present invention.Owing in the composition of design, Cr, Mo, V element are arranged, higher quenching degree are arranged.
The manufacturing approach of continuous casting steel dummy bar head of the present invention, it comprises the steps: 1) by mentioned component smelting, casting, rolling becoming a useful person; 2) heat treatment, normalizing+high tempering; 950 ~ 1050 ℃ of normalizing temperatures, 600 ~ 750 ℃ of the temperature of tempering; 3), obtain needing to be fit to the dummy bar head that continuous casting is produced through machined.
Technology for Heating Processing of the present invention is normalizing+high tempering, thereby obtains ferrite and pearlitic structrure, and simultaneously, the solution strengthening of Cr and Mo can improve the recrystallization temperature of matrix.
The temperature of normalizing is controlled at 950 ~ 1050 ℃, takes oil hardening to handle after the normalizing, obtains a considerable amount of martensites, improves lasting intensity.The material mixture ratio of science, the heat treating regime of necessary cooperation science just can obtain satisfied performance.
Tissue after the normalizing is unsettled, for this reason after normalizing 600 ~ 750 ℃ of temper, temperature can not too high (can not surpass Ac1, can make like this in the cooling after austenite appears in the part high carbon martensite to occur).The mechanical behavior under high temperature of this type steel after Overheating Treatment will significantly promote.Thereby be fit to do the dummy bar head material of continuous casting.
Through after the above-mentioned special thermal treatment technology, pass through corresponding machined again, just can obtain needing to be fit to the dummy bar head that continuous casting is produced.Serviceability temperature can reach 580 ℃, can bear the effect of dummy ingot fully, and service life is longer.
Beneficial effect of the present invention:
The phenomenon of surface checking just takes place after 1) existing dummy bar head uses for several times, and hot-cracking resistance is not strong.Through the service life that the low-carbon (LC) pearlite type dummy bar head of technical finesse of the present invention will greatly improve dummy bar head, and can greatly improve the smooth and easy stabilizing power of logistics of steel mill.
2) the present invention adopts the dummy bar head material of continuous casting steel machine, can be widely used in being used in the continuous casting steel machine to make dummy bar head, has good heat resistance, and the life-span is long, and is with low cost, etc. advantage.
The specific embodiment
Below in conjunction with embodiment the present invention is further specified.
Table 1 has been listed embodiment of the invention composition.
Table 1 unit: percentage by weight
| Embodiment | C | Si | Mn | P | S | Cr | Mo | V | Fe |
| 1 | 0.08 | 0.15 | 0.40 | 0.001 | 0.030 | 1.0 | 0.50 | 0.15 | Surplus |
| 2 | 0.10 | 0.13 | 0.50 | 0.020 | 0.030 | 1.0 | 0.40 | 0.20 | Surplus |
| 3 | 0.12 | 0.13 | 0.50 | 0.030 | 0.030 | 1.2 | 0.60 | 0.12 | Surplus |
| 4 | 0.08 | 0.14 | 0.55 | 0.020 | 0.010 | 0.9 | 0.35 | 0.16 | Surplus |
| 5 | 0.09 | 0.13 | 0.45 | 0.010 | 0.020 | 1.1 | 0.38 | 0.17 | Surplus |
| 6 | 0.10 | 0.15 | 0.60 | 0.015 | 0.016 | 0.95 | 0.45 | 0.28 | Surplus |
| 7 | 0.13 | 0.14 | 0.65 | 0.020 | 0.020 | 1.1 | 0.55 | 0.18 | Surplus |
| 8 | 0.15 | 0.14 | 0.45 | 0.001 | 0.005 | 1.2 | 0.36 | 0.25 | Surplus |
Embodiment 1
The content of guaranteeing carbon in the composition design of present embodiment is 0.08%, and Cr is 1%, and Mo is 0.5%, and V is 0.15%, and all the other are Fe; After smelting qualified composition, through the die casting cast molding crude green body that comes out, pass through preparatory processing then, pass through following heat treatment again.
Carry out normalized treatment at 950 ℃, adopt after the oil quenching, at 600 ℃ of tempering 2h.Can obtain the ferrous materials of needs, just can obtain the dummy bar head of excellent performance again through machined.The dummy bar head of selecting the present invention to make; Cr, Mo are retained in the matrix of solid solution; VC can be evenly distributed on the highdensity network of dislocation of martensite and bainite, through the phase transformation of martensite and bainite, and refinement matrix mosaic texture; VC separates out on this structure in addition, improves the strengthening effect of alloy more.Matrix has improved the temperature of the crystallization again of matrix owing to passed through the solution strengthening of Cr and Mo, makes this reinforcement when high temperature, still can keep preferable performance.
Embodiment 2
The content of guaranteeing C in the composition design of present embodiment is 0.10%, and Cr is 1%, and Mo is 0.4%, and V is 0.2%, and all the other are Fe; After smelting qualified composition, through the die casting cast molding crude green body that comes out, pass through preparatory processing then, pass through following heat treatment again.
Carry out normalized treatment at 1000 ℃, adopt after the oil quenching, at 650 ℃ of tempering 2.5h.Temperature is high, can obtain dispersing carbide and make even tissue stable.But temperature can not too highly can not surpass 750 ℃, avoids occurring the austenite of high-carbon.Can obtain the ferrous materials of needs, just can obtain the dummy bar head of excellent performance again through machined.The dummy bar head of selecting the present invention to make; Cr, Mo are retained in the matrix of solid solution; VC can be evenly distributed on the highdensity network of dislocation of martensite and bainite, through the phase transformation of martensite and bainite, and refinement matrix mosaic texture; VC separates out on this structure in addition, improves the strengthening effect of alloy more.Matrix has improved the temperature of the crystallization again of matrix owing to passed through the solution strengthening of Cr and Mo, makes this reinforcement when high temperature, still can keep preferable performance.
Embodiment 3
The content of guaranteeing carbon in the composition design of present embodiment is 0.12%, and Cr is 1.2%, and Mo is 0.6%, and V is 0.12%, and all the other are Fe; After smelting qualified composition, through the die casting cast molding crude green body that comes out, pass through preparatory processing then, pass through following heat treatment again.
Carry out normalized treatment at 1050 ℃, adopt after the oil quenching, at 750 ℃ of tempering 3h.Can obtain the ferrous materials of needs, just can obtain the dummy bar head of excellent performance again through machined.The dummy bar head of selecting the present invention to make; Cr, Mo are retained in the matrix of solid solution; VC can be evenly distributed on the highdensity network of dislocation of martensite and bainite, through the phase transformation of martensite and bainite, and refinement matrix mosaic texture; VC separates out on this structure in addition, improves the strengthening effect of alloy more.Matrix has improved the temperature of the crystallization again of matrix owing to passed through the solution strengthening of Cr and Mo, makes this reinforcement when high temperature, still can keep preferable performance.
Prepare material through the present invention, advanced machining, the dummy bar head that the suitable continuous casting that obtains is produced; Serviceability temperature can reach 580 ℃; Can bear the effect of dummy ingot fully, and service life is longer, can solves present continuous casting to a certain extent and open and take off ingot failure and dummy bar head maintenance cost problem of higher after watering; And enhance productivity, the logistics of assurance is smooth and easy in order.
Claims (2)
1. continuous casting steel dummy bar head, its composition percentage by weight is: C 0.08 ~ 0.15%, Si0.15 ~ 0.14%, Mn 0.4 ~ 0.7%; P≤0.030%, S≤0.030%, Cr 0.9 ~ 1.2%; Mo0.35 ~ 0.60%, V 0.15 ~ 0.30%, and all the other are Fe and inevitable impurity.
2. the manufacturing approach of continuous casting steel dummy bar head as claimed in claim 1, it comprises the steps:
1) by mentioned component smelting, casting, rolling becoming a useful person; 2) heat treatment, normalizing+high tempering; 950 ~ 1050 ℃ of normalizing temperatures, 600 ~ 750 ℃ of the temperature of tempering; 3), obtain needing to be fit to the dummy bar head that continuous casting is produced through machined.
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| CN201210177145XA CN102649151A (en) | 2012-05-31 | 2012-05-31 | Dummy head for continuous casting steel and manufacturing method thereof |
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| CN201210177145XA CN102649151A (en) | 2012-05-31 | 2012-05-31 | Dummy head for continuous casting steel and manufacturing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104561801A (en) * | 2014-12-31 | 2015-04-29 | 南阳汉冶特钢有限公司 | Structural alloy steel 12CrMoV steel plate and production method thereof |
Citations (4)
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| JP2004018993A (en) * | 2002-06-20 | 2004-01-22 | Aichi Steel Works Ltd | Low alloy non-heat-treated heat resistant steel having reduced variation in strength under high temperature environment and method of producing the same |
| CN1718831A (en) * | 2004-07-06 | 2006-01-11 | 株式会社日立制作所 | Heat-proof steel and shaft using same for steam turbine,steam turbine and steam turbine generator |
| JP2007100203A (en) * | 2005-10-07 | 2007-04-19 | Sumitomo Metal Ind Ltd | Low alloy steel material having austenite grain inhibited from growing when re-heated, and method for continuously casting steel material into slab |
| CN102433513A (en) * | 2011-11-29 | 2012-05-02 | 杨学焦 | Preparation and heat treatment method of low-alloy heat-resistant high-strength steel memebers |
-
2012
- 2012-05-31 CN CN201210177145XA patent/CN102649151A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004018993A (en) * | 2002-06-20 | 2004-01-22 | Aichi Steel Works Ltd | Low alloy non-heat-treated heat resistant steel having reduced variation in strength under high temperature environment and method of producing the same |
| CN1718831A (en) * | 2004-07-06 | 2006-01-11 | 株式会社日立制作所 | Heat-proof steel and shaft using same for steam turbine,steam turbine and steam turbine generator |
| JP2007100203A (en) * | 2005-10-07 | 2007-04-19 | Sumitomo Metal Ind Ltd | Low alloy steel material having austenite grain inhibited from growing when re-heated, and method for continuously casting steel material into slab |
| CN102433513A (en) * | 2011-11-29 | 2012-05-02 | 杨学焦 | Preparation and heat treatment method of low-alloy heat-resistant high-strength steel memebers |
Non-Patent Citations (2)
| Title |
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| 王贞等: "热处理工艺对12Cr1MoV钢组织性能的影响", 《热处理技术与装备》, vol. 33, no. 2, 30 April 2012 (2012-04-30) * |
| 陈勇: "提高3#连铸机引锭头的使用寿命", 《太钢科技》, no. 1, 31 December 2009 (2009-12-31) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104561801A (en) * | 2014-12-31 | 2015-04-29 | 南阳汉冶特钢有限公司 | Structural alloy steel 12CrMoV steel plate and production method thereof |
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Application publication date: 20120829 |