CN104174827A - Titanium-iron powder core spun yarn suitable for continuous casting crystallizer - Google Patents
Titanium-iron powder core spun yarn suitable for continuous casting crystallizer Download PDFInfo
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- CN104174827A CN104174827A CN201310205387.XA CN201310205387A CN104174827A CN 104174827 A CN104174827 A CN 104174827A CN 201310205387 A CN201310205387 A CN 201310205387A CN 104174827 A CN104174827 A CN 104174827A
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Abstract
The invention provides a titanium-iron powder core spun yarn suitable for a continuous casting crystallizer. The titanium-iron powder core spun yarn is formed by titanium-iron powder with the particle size being 60-150 meshes and a low carbon thin steel plate wrapping the titanium-iron powder, wherein the titanium-iron powder contains 65-75% of titanium and the thickness of the low carbon steel plate is 0.15-0.25mm. The core spun yarn is suitable for being fed into the continuous casting crystallizer, and the titanium-iron powder can be fully melt in the crystallizer and uniformly dispersed, so the crystal grains of steel are fully refined.
Description
Technical field
The present invention relates to a kind of titanium core-spun yarn, particularly relate to a kind of titanium core-spun yarn being suitable in continuous cast mold feeding.
Background technology
The mechanical performance of steel not only depends on its Composition Design, also depends on the actual tissue of steel, and this is the common recognition of the art.In general, as long as the chemical composition in steel meets the requirement of technical specification, its intensity just can reach the requirement of technical specification, but plasticity is different with the tissue of toughness Chang Yingang, and often difference is very large, and for example, the performance of traditional 20MnSi structural steel is like this.For improving plasticity and the toughness of 20MnSi structural steel, those skilled in the art has taked a lot of solutions, and one of them is, by making the refinement of 20MnSi structural crystal grain improve its plasticity and toughness.Concrete means are by forming tiny crystallization particle so that grain refinement in steel.
Vanadium and nitrogen can form very tiny vanadium nitride particle in steel, and it can cause the grain refinement of steel, thereby obviously improve plasticity and the toughness of steel.Yet, because the price of vanadium is very expensive, thus by add the performance that vanadium improves steel in steel, see economically, and infeasible, particularly for this mass production of 20MnSi structural steel and for the narrow and small steel grade of profit margin, particularly like this.
In view of this, those skilled in the art is devoted to seek a kind of comparatively cheap always, but act on close grain refinement unit, usually replaces vanadium, to reach the performance that can improve steel, and the object of the production cost of not obvious increase steel again.
Those skilled in the art's discovery, titanium has the function of the crystal grain thinning similar to vanadium.Because the price of titanium is only 1/8th of vanadium price, thereby titanium is the desirable substitute of vanadium.
Traditional method that adds titanium is, is accompanied by toward nitrogen blowing in steel ladle, toward wherein adding titanium, commonly titanium-iron.Described titanium-iron form, can be titanium-iron block, can be also the core-spun yarn that is filled with the agent of titanium-iron powder.Although titanium has the function of obvious crystal grain thinning, it also makes molten steel become sticky, even the drawback of the mobility variation of molten steel.Directly add the result in molten steel to be titanium-iron block or titanium-iron powder agent core-spun yarn, when cast, the mouth of a river may be blocked, thus the accident that causes cast to interrupt.In addition, the titanium absorptivity adding in steel ladle after titanium is processed is only 30-50%.
The feasible method of eliminating this risk is that the core-spun yarn that is filled with titanium-iron powder is directly fed in continuous cast mold.But the line feeding condition at crystallizer place is extremely undesirable: 1. the amount of the liquid molten steel holding in crystallizer is very limited, thereby the core-spun yarn of the titanium-iron powder of feeding may invar hydro-thermal off-capacity and not fusing completely; 2. the temperature of the liquid molten steel holding in crystallizer is lower, and mobility is poor, even if thereby the titanium-iron powder of feeding melt completely, also not necessarily can be uniformly dispersed.Relate to that titanium-iron powder melts completely and homodisperse factor is a lot, the casting speed when size of the steel billet of mainly contain the material of the liquid steel temperature in crystallizer, the concrete composition of titanium-iron powder used, described core-spun yarn crust and thickness thereof, pouring into a mould and cast etc.Consider above-mentioned factor, thereby form a kind of practical titanium-iron powder core-spun yarn that supplies, not being one is only achievable thing by limited normal experiment.Therefore, although existing in the prior art, can be used for the titanium-iron powder core-spun yarn in steel ladle, the titanium-iron powder core-spun yarn being applicable in continuous cast mold did not slowly occur.
The object of the present invention is to provide a kind of titanium-iron powder core-spun yarn applicable to continuous cast mold.
Technical solution
The invention provides a kind of titanium-iron powder core-spun yarn that is applicable to continuous cast mold, it is configured to: titanium-iron powder agent and for wrapping up the metal sheath of described titanium-iron powder agent;
Described titanium-iron powder agent comprises that titaniferous is titanium-iron of 65-75%, and its granularity is 50-150 order
Described metal sheath is mild-steel sheet, and its thickness is 0.15mm-0.25mm;
The external diameter of described titanium-iron powder core-spun yarn is 3mm-6mm; The pulvis content of its unit length is 30g/m-50g/m.
Preferably,
Described titanium-iron powder comprises that titaniferous is titanium-iron of 67%-72%;
The thickness of described metal sheath is 0.18-0.22mm; The pulvis content of its unit length is 38g/m-42g/m.
The external diameter of described titanium-iron powder core-spun yarn is 4-5mm;
Its granularity is 80-100 order.
Experiment shows, the titaniferous amount of described core-spun yarn titanium-iron powder used is increased to 75% when above, and the effect of this core-spun yarn crystal grain thinning obviously improves; And be down to when following to 60% when the titaniferous amount of described core-spun yarn titanium-iron powder used, the successful of described core-spun yarn crystal grain thinning declines, and, along with the decline of Ti content, feed at the appointed time enough titaniums, certainly will to improve wire-feeding velocity, this brings again the difficult problem that casting speed and wire-feeding velocity are matched, therefore, the present invention is defined as 65-75% by the titaniferous amount of described titanium-iron powder, is more preferably 67%-72%;
The pulvis content of described titanium-iron powder core-spun yarn unit length being decided to be to 30g/m-50g/m, being more preferably 38g/m-42g/m, is because this parameter had both affected the rigidity of described core-spun yarn, affects again the Proper Match of wire-feeding velocity and casting speed.If the pulvis content of described titanium-iron powder core-spun yarn unit length, lower than 30g/m, makes the insufficient rigidity of described core-spun yarn, thereby crystallizer can not successfully be fed; If the pulvis content of described titanium-iron powder core-spun yarn unit length is greater than 50g/m, certainly will need to reduce casting speed, or reduce and feed fine rule speed, this will cause the disorder of whole technological process.Experiment showed, the pulvis content of described titanium-iron powder core-spun yarn unit length is decided to be to 30g/m-50g/m, can guarantee the direct motion of continuous casting working procedure.
Described metal sheath is determined to thickness is 0.15mm-0.25mm, be more preferably 0.18-0.22mm, to consider, if the thickness of described metal sheath is greater than 0.25mm, it can not fully melt in crystallizer, result causes titanium can not be in molten steel fully to disperse, and apparent result is, the grain size of steel is failed refinement; And if the thickness of described metal sheath is less than 0.15mm; inadequate by the rigidity of the core-spun yarn of its formation; result causes described core-spun yarn to cross soft and can not penetrate the protection slag blanket above molten steel in mold; successfully feed in molten steel; therefore, the thickness of described metal sheath is defined as to 0.15mm-0.25mm.
For guaranteeing titanium alloy powder fully fusing in crystallizer, need be controlled the granularity of described powder.The reasonable granularity that experiment showed, this powder is 60-150 order, and is more preferably 80-100 order.Although the granularity of powder is less, be more conducive to the fusing of this powder and the dispersion of titanium, make this granularity < 150 orders there is no obvious advantage, and described powder is thinner, the trend of its agglomerate is stronger.During this granularity > 60 order, powder is difficult to fusing, to be difficult to homodisperse trend be apparent to titanium, so it is useful that the present invention is decided to be 60-150 order by the granularity of pulvis.
The technology of preparing core-spun yarn is known routine techniques already, and its manufacturing equipment using is conventional cored machine, and to this, the inventor does not repeat.
Titanium core-spun yarn of the present invention is suitable for using in continuous cast mold.With the outstanding advantages of titanium core-spun yarn of the present invention, be, it not only can make the grain refinement of steel, thereby obviously improve the performance such as plasticity, toughness, impact of steel, the more important thing is, because titanium core-spun yarn of the present invention is suitable for using in continuous cast mold, thereby avoided because of nitrogen flushing in steel ladle, add titanium and make the blocked drawback in the mouth of a river.
Below by embodiment, further illustrate the present invention.
Specific embodiments
Embodiment 1.
By conventional method, prepare titanium core-spun yarn.Titanium-iron powder agent in described core-spun yarn is that titaniferous is titanium-iron powder of 72%, and its granularity is 80 orders; Its crust is made with mild steel, and thickness is 0.18mm; The external diameter of described titanium core-spun yarn is 4mm.
The pulvis content of the unit length of described titanium-iron powder core-spun yarn is 40g/m.
Above-mentioned core-spun yarn is used for processing 20MnSi structural steel molten steel, the square billet that continuous casting billet is 150 * 150mm at continuous cast mold.From the molten steel of tundish, through the mouth of a river, be divided into 10 streams and inject respectively 10 crystallizers.Meanwhile, the wire-feeding velocity dividing with 5m/, feeds above-mentioned core-spun yarn in described continuous cast mold by 10 feeding wire machine.In whole casting process, line feeding is smooth, without broken string, knotting phenomenon, occurs.
The assay of gained steel billet:
The absorptivity of titanium is 85.2%-87.3%;
Being evenly distributed of titanium, without obvious titanium segregation.
Claims (2)
1. titanium-iron powder the core-spun yarn that is applicable to continuous cast mold, it is configured to:
Titanium-iron powder agent and for wrapping up the metal sheath of described titanium-iron powder agent,
Described titanium-iron powder agent comprises that titaniferous is titanium-iron of 65-75%, and its granularity is 50-150 order,
Described metal sheath is mild-steel sheet, and its thickness is 0.15mm-0.25mm,
The external diameter of described titanium-iron powder core-spun yarn is 3mm-6mm; The pulvis content of its unit length is 30g/m-50g/m.
2. titanium-iron powder the core-spun yarn that is applicable to continuous cast mold as claimed in claim 1, wherein,
Described titanium-iron powder comprises that titaniferous is titanium-iron of 67%-72%; Its granularity is 80-100 order,
The thickness of described metal sheath is 0.18-0.22mm; The pulvis content of its unit length is 38g/m-42g/m,
The external diameter of described titanium-iron powder core-spun yarn is 4-5mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310205387.XA CN104174827A (en) | 2013-05-28 | 2013-05-28 | Titanium-iron powder core spun yarn suitable for continuous casting crystallizer |
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| CN201310205387.XA CN104174827A (en) | 2013-05-28 | 2013-05-28 | Titanium-iron powder core spun yarn suitable for continuous casting crystallizer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109848382A (en) * | 2019-01-30 | 2019-06-07 | 凌源钢铁股份有限公司 | A kind of titanium alloyed method in process for making |
| CN111922306A (en) * | 2020-07-02 | 2020-11-13 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for reducing center segregation of high-carbon steel billet |
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| JP2008506837A (en) * | 2004-07-16 | 2008-03-06 | トランジション インターナショナル リミテッド | Products for increasing titanium content in steel |
| CN101260486A (en) * | 2007-03-06 | 2008-09-10 | 上海崇明冶金材料厂 | Low-nitrogen low-aluminum ferrotitanium, manufacturing method thereof and core-spun yarn |
| RU2364633C1 (en) * | 2007-12-27 | 2009-08-20 | Общество с ограниченной ответственностью "ПРОМРЕСУРС" | Flux cored wire for steel microalloying with ferrotitanium based filler (versions) |
| CN202162360U (en) * | 2011-07-08 | 2012-03-14 | 向守军 | Boron-iron cored wire |
| CN202369603U (en) * | 2011-12-07 | 2012-08-08 | 上海马腾新型材料厂 | Low nitrogen titanium iron core-spun yarn |
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2013
- 2013-05-28 CN CN201310205387.XA patent/CN104174827A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008506837A (en) * | 2004-07-16 | 2008-03-06 | トランジション インターナショナル リミテッド | Products for increasing titanium content in steel |
| CN101260486A (en) * | 2007-03-06 | 2008-09-10 | 上海崇明冶金材料厂 | Low-nitrogen low-aluminum ferrotitanium, manufacturing method thereof and core-spun yarn |
| RU2364633C1 (en) * | 2007-12-27 | 2009-08-20 | Общество с ограниченной ответственностью "ПРОМРЕСУРС" | Flux cored wire for steel microalloying with ferrotitanium based filler (versions) |
| CN202162360U (en) * | 2011-07-08 | 2012-03-14 | 向守军 | Boron-iron cored wire |
| CN202369603U (en) * | 2011-12-07 | 2012-08-08 | 上海马腾新型材料厂 | Low nitrogen titanium iron core-spun yarn |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109848382A (en) * | 2019-01-30 | 2019-06-07 | 凌源钢铁股份有限公司 | A kind of titanium alloyed method in process for making |
| CN111922306A (en) * | 2020-07-02 | 2020-11-13 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for reducing center segregation of high-carbon steel billet |
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Application publication date: 20141203 |