CN103849712A - Fluoride-free refining slag for 20 Cr structural alloy steel and preparation method thereof - Google Patents
Fluoride-free refining slag for 20 Cr structural alloy steel and preparation method thereof Download PDFInfo
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- CN103849712A CN103849712A CN201410102562.7A CN201410102562A CN103849712A CN 103849712 A CN103849712 A CN 103849712A CN 201410102562 A CN201410102562 A CN 201410102562A CN 103849712 A CN103849712 A CN 103849712A
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- refining slag
- slag
- fluoride
- mgo
- free refining
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The invention discloses fluoride-free refining slag for 20 Cr structural alloy steel and a preparation method thereof. The granularity of the fluoride-free refining slag is 15-35mm, and the fluoride-free refining slag comprises the following components in percentage by weight: 55-60% of CaO, 10-16% of SiO2, 15-20% of Al2O3, 4-6% of MgO, 5-10% of B2O3, less than or equal to 1% of TFe and the balance of impurities. The preparation method of the fluoride-free refining slag comprises that mineral ore raw materials containing CaO, SiO2, Al2O3, MgO and B2O3 are crushed and blended and then moulding and crushing are carried out, so that the fluoride-free refining slag finished product is obtained. The preparation method of the fluoride-free refining slag is simple, and the prepared fluoride-free refining slag has the advantages of environmental friendliness, no fluoride, high slagging speed, strong slag inclusion removal capability, less furnace lining corrosion and strong desulphurization capability.
Description
Technical field
The present invention relates to a kind of 20Cr structural alloy steel fluorine-free refining slag and preparation method thereof, belong to steelmaking technical field.
Background technology
20Cr steel is most typical basic kind in chromium alloy structure iron, market demand is huge, the manufacturing such as automobile, mining machinery be widely used in manufacturing heart portion requirement of strength compared with high, surperficial taking up wear, sectional dimension below 30mm or shape compared with carburized parts complicated and that load is little, as gear, gear shaft, cam, wrist pin, worm screw etc.; Or for requiring the part of the little and high-wearing feature of heat treatment deformation, after carburizing, can carry out high-frequency surface hardening; Or large and bear the modified part of medium impact load for working speed, in Chinese national economy and national defense construction, play an important role.
Along with socioeconomic development, user is more and more higher to the specification of quality of 20Cr structural alloy steel.And [S], [O] content in steel product quality and steel, and the kind of inclusion, quantity, size, distribution are relevant, and steel mechanics performance, fatigue property, hot top performance and welding property etc. are had to material impact, are directly determining the end-use performance that steel are final.In the quality examination of 20Cr structural alloy steel, according to inclusion composition and pattern, steel inclusion is divided into A(sulfide-based), B(Al
2o
3class), C(silicates), D(calcium-aluminate class) and Ds(macrobead be mingled with) five classes are mingled with, and each type impurity are had to strict demand.At present, more and more iron and steel enterprises adopt " converter → argon station → LF refining furnace → continuous casting " explained hereafter 20Cr structural alloy steel, and LF refining furnace is because having the functions such as heating, stirring, alloying, and can realize trimming and accurately the feature such as controls become the key link of raising steel product quality.The viewpoint of " having refined steel and must first make slag " as field of metallurgy, the removal of desulfurization in LF refining, deoxidation and non-metallic inclusion mainly relies on the effect of refining slag, therefore selects suitable refining slag system most important for producing high-quality 20Cr structural alloy steel.
Tradition refining slag, in order to solve the problem that slag burn-off rate is slow, fusing point is high, viscosity is large, often adds CaF in slag
2, but practice shows CaF
2use can produce many disadvantageous effects: (1) is containing CaF
2slag serious to lining erosion, increase cost of equipment maintenance; (2) CaF under high temperature
2with other component reaction in slag, generate fluoro-gas and enter human body by respiratory tract, digestive tube and skin, can cause taking skeleton change as main systemic disease; (3) under high temperature, contain CaF
2slag can produce a large amount of fluorochemicals, enter the ecosystem and can cause crop production reduction, herding chronic poisoning.In view of many disadvantageous effects that fluorine brings environment and human body, developed country has strengthened monitoring and the legislation to fluoride pollution, for slag, can predict the developing direction that floride-free slag is following slag.
The CaF of fusing assistant abandoning tradition in the present invention
2, adopt B
2o
3to eliminate fluoride pollution, and by controlling CaO-SiO
2-Al
2o
3the chemical composition that refining slag system is suitable, reaches stable, effectively and the refining effect of environmental protection.
Summary of the invention
The object of the present invention is to provide a kind of 20Cr structural alloy steel fluorine-free refining slag, to control steel inclusion rank, improve steel product quality and reach stable, effectively and the refining effect of environmental protection.
Second object of the present invention is to provide the preparation method of a kind of 20Cr structural alloy steel fluorine-free refining slag.
For realizing above-mentioned first object, the technical solution used in the present invention is:
A kind of 20Cr structural alloy steel fluorine-free refining slag, the granularity of described refining slag is 15～35mm, each compositions in weight percentage is: 55～60%CaO, 10～16%SiO
2, 15～20%Al
2o
3, 4～6%MgO, 5～10%B
2o
3, TFe≤1%, surplus is impurity.
Further, the granularity of described refining slag is 15～25mm, and each compositions in weight percentage is: 57～60%CaO, 10～13%SiO
2, 17～20%Al
2o
3, 5～6%MgO, 7～10%B
2o
3, TFe≤1%, surplus is impurity.
For realizing above-mentioned second object, the technical solution used in the present invention is as follows:
1) selection of raw material is with broken: select containing CaO, SiO
2, Al
2o
3, MgO and B
2o
3ore be that raw material carries out mixture after fragmentation, make each compositions in weight percentage in the raw material after mixture be: 55～60%CaO, 10～16%SiO
2, 15～20%Al
2o
3, 4～6%MgO, 5～10%B
2o
3, TFe≤1%, surplus is impurity; Then after the good raw material powder of mixture being broken into the following particle of 5mm, be mixed evenly;
2) moulding: by the particle fritting mixing, prefusing temperature is 1450 DEG C～1600 DEG C, fully pours naturally cooling in slag bucket into and can obtain solid-state work in-process after fusing; Work in-process fragmentation is processed into granularity 15～35mm, and refining slag gets product.
Further, described containing CaO, SiO
2, Al
2o
3, MgO and B
2o
3ore be quickened lime, calcium aluminate, wollastonite, rhombspar and boric anhydride.
20Cr structural alloy steel of the present invention is with in fluorine-free refining slag:
CaO, it is the chief component of refining slag, work to regulate refining slag basicity and slag fusing point and mobility, to guarantee that slag has good desulfurization, adsorbs the desoxydatoin that is mingled with ability and strengthens slag, in the present invention, the content of CaO is controlled at 55～60%.In slag, CaO too high levels can cause slag melting rising, viscosity to increase, and is unfavorable for slag absorption steel inclusion; In slag, CaO content is too low can reduce basicity of slag, is unfavorable for slag desulfurization.
SiO
2, Main Function is to coordinate CaO to maintain the basicity that slag is suitable, and makes slag have good mobility, thereby realizes good desulfurization, absorption is mingled with effect, SiO in the present invention
2content be controlled at 10～16%.SiO in slag
2too high levels can reduce basicity of slag, is unfavorable for desulfurization; SiO in slag
2the too low meeting of content raises basicity of slag, although favourable to liquid steel desulphurization, can affect the control of slag to category-B inclusion.
Al
2o
3, Main Function is to strengthen the adsorptive power of slag to inclusion, Al in the present invention
2o
3content be controlled at 15～20%.Al
2o
3too high levels can reduce the adsorptive power of slag to inclusion, and causes viscosity coefficient of dross to increase the carrying out that is unfavorable for slag-molten steel chemical reaction; Al
2o
3content is too low easily causes D type impurity in steel to exceed standard.
MgO, Main Function is protection ladle furnace lining, reduces the erosion of slag to ladle lining, in the present invention, the content of MgO is controlled at 4～6%.MgO too high levels can cause viscosity coefficient of dross to increase, and is unfavorable for the carrying out of slag-molten steel chemical reaction; The too low meeting of MgO content causes slag to aggravate lining erosion.
B
2o
3, mainly make fusing assistant and promote lime to dissolve, and improve slag making speed and smelt stability, B in the present invention
2o
3content be controlled at 5～10%.
The present invention compared with prior art has following beneficial effect:
(1) not containing CaF
2, eliminate fluoride pollution, meet green metallurgical requirement.
(2) desulfurization and removal of inclusions ability are strong, can significantly improve purity of steel: A, category-B inclusion rank all≤0.5 grade, C, D and D
stype impurity rank all≤1 grade;
(3) lining erosion is light;
(4) B
2o
3the effect of fluxing remarkable, slagging speed is fast;
(5) adopt fritting processing, improved stability and the metallurgical effect of refining slag, be convenient to accumulating and use.
Embodiment
Below in conjunction with embodiment, the present invention is further detailed explanation.
The preparation method of fluorine-free refining slag of the present invention is:, will there is CaO, SiO
2, Al
2o
3, MgO and B
2o
3the raw material of composition: quickened lime, calcium aluminate, wollastonite, rhombspar and boric anhydride make through fragmentation → batching → molding procedure the refining slag that granularity is 15～35mm, and in described refining slag, each compositions in weight percentage is: 55～60%CaO, 10～16%SiO
2, 15～20%Al
2o
3, 4～6%MgO, 5～10%B
2o
3, TFe≤1%, surplus is impurity, and the granularity of refining slag is 15～35mm.Those skilled in the art can know, when adopting other to have CaO, SiO
2, Al
2o
3, MgO and B
2o
3when the raw material of composition, as: Wingdale, quartzite, bauxitic clay, light dolomite and boric anhydride, can solve equally technical problem of the present invention, reach technique effect of the present invention.
20Cr structural alloy steel in embodiments of the invention adopts " converter → argon station → LF refining furnace → continuous casting " explained hereafter, and described fluorine-free refining slag adds ladle at LF refining process.
Each comparative example is identical with the technique that embodiment produces 20Cr structural alloy steel, and difference is only that in fluorine-free refining slag, each component concentration is different.
In each embodiment and comparative example, the concrete component concentration of refining slag is in table 1, uses level of control that the refining slag of each embodiment and comparative example produces the 20Cr alloy structure steel inclusion obtaining in table 2.
The each embodiment of table 1 and the granularity of comparative example fluorine-free refining slag and the weight percent content of each component
| Project | CaO | SiO 2 | Al 2O 3 | MgO | B 2O 3 | CaF 2 | Granularity |
| Embodiment 1 | 55.0 | 15.5 | 16.5 | 4.0 | 5.0 | -- | 15 |
| Embodiment 2 | 59.8 | 10.0 | 16.3 | 5.7 | 5.7 | -- | 20 |
| Embodiment 3 | 55.1 | 16.0 | 15.5 | 5.4 | 6.4 | -- | 20 |
| Embodiment 4 | 60.0 | 10.1 | 15.1 | 4.2 | 10.0 | -- | 25 |
| Embodiment 5 | 58.4 | 11.5 | 15.0 | 6.0 | 7.5 | -- | 35 |
| Embodiment 6 | 59.0 | 10.4 | 17.0 | 4.1 | 5.4 | -- | 25 |
| Comparative example 1 | 45.0 | 12.2 | 21.0 | 10.0 | -- | 9.8 | 30 |
| Comparative example 2 | 43.5 | 15.7 | 17.0 | 10.0 | -- | 11.0 | 25 |
| Comparative example 3 | 44.0 | 14.0 | 19.0 | 9.8 | -- | 12.0 | 22 |
| Comparative example 4 | 45.4 | 12.0 | 17.5 | 11.4 | -- | 10.4 | 30 |
The level of control of the 20Cr alloy structure steel inclusion that the fluorine-free refining slag of the each embodiment of table 2 and comparative example is produced
As shown in Table 2, use the fluorine-free refining slag prepared of the present invention to produce in the 20Cr structural alloy steel obtaining A, B, C, D and the control of Ds type impurity good, A, category-B inclusion are no more than 0.5 grade, and C, D and Ds type impurity are no more than 1 grade.
Use the refining slag prepared of the present invention to produce that the 20Cr structural alloy steel fluorine-free refining slag obtaining has advantages of environmental protection, sweetening power is strong, lining erosion is little, change slag speed soon and inclusion removal ability strong, can significantly reduce steel inclusion rank, improve the purity of steel, the quality that improves 20Cr structural alloy steel is had to obvious effect.
Claims (4)
1. a 20Cr structural alloy steel fluorine-free refining slag, is characterized in that: the granularity of described refining slag is 15～35mm, and each compositions in weight percentage is: 55～60%CaO, 10～16%SiO
2, 15～20%Al
2o
3, 4～6%MgO, 5～10%B
2o
3, TFe≤1%, surplus is impurity.
2. 20Cr structural alloy steel fluorine-free refining slag according to claim 1, is characterized in that: the granularity of described refining slag is 15～25mm, and each compositions in weight percentage is: 57～60%CaO, 10～13%SiO
2, 17～20%Al
2o
3, 5～6%MgO, 7～10%B
2o
3, TFe≤1%, surplus is impurity.
3. the preparation method of fluorine-free refining slag for 20Cr structural alloy steel claimed in claim 1, is characterized in that: the method comprises the steps:
1) selection of raw material is with broken: select containing CaO, SiO
2, Al
2o
3, MgO and B
2o
3ore be that raw material carries out mixture after fragmentation, make each compositions in weight percentage in the raw material after mixture be: 55～60%CaO, 10～16%SiO
2, 15～20%Al
2o
3, 4～6%MgO, 5～10%B
2o
3, TFe≤1%, surplus is impurity; Then after the good raw material powder of mixture being broken into the following particle of 5mm, be mixed evenly;
2) moulding: by the particle fritting mixing, prefusing temperature is 1450 DEG C～1600 DEG C, fully pours naturally cooling in slag bucket into and can obtain solid-state work in-process after fusing; Work in-process fragmentation is processed into granularity 15～35mm, and refining slag gets product.
4. the preparation method of fluorine-free refining slag for 20Cr structural alloy steel according to claim 3, is characterized in that: described containing CaO, SiO
2, Al
2o
3, MgO and B
2o
3ore be quickened lime, calcium aluminate, wollastonite, rhombspar and boric anhydride.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410102562.7A CN103849712A (en) | 2014-03-19 | 2014-03-19 | Fluoride-free refining slag for 20 Cr structural alloy steel and preparation method thereof |
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|---|---|---|---|
| CN201410102562.7A CN103849712A (en) | 2014-03-19 | 2014-03-19 | Fluoride-free refining slag for 20 Cr structural alloy steel and preparation method thereof |
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| CN103849712A true CN103849712A (en) | 2014-06-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110669894A (en) * | 2019-09-30 | 2020-01-10 | 鞍钢股份有限公司 | Fluorine-free KR desulfurizer and preparation method thereof |
| CN111575442A (en) * | 2020-05-29 | 2020-08-25 | 鞍钢股份有限公司 | Low-melting-point high-efficiency desulfurizing agent and preparation and application methods thereof |
| CN111996335A (en) * | 2020-09-10 | 2020-11-27 | 河北工程大学 | Core-spun yarn core powder composition for high-aluminum steel production and processing method |
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| CN101519713A (en) * | 2009-04-03 | 2009-09-02 | 江苏大学 | Slag adhesion preventing fluorine-free slag modifier for ladle refining, preparation method and using method |
| CN102051443A (en) * | 2010-12-31 | 2011-05-11 | 昆明理工大学 | High basicity fluorine-free RH (Ruhrstah-Heraeus) desulfurizer |
| CN102876842A (en) * | 2012-06-28 | 2013-01-16 | 辽宁天和科技股份有限公司 | Premelting slugging desulfurizer taking 12 CaO*7Al2O3 and 3CaO*5Al2O3 as main phases |
| CN102912082A (en) * | 2012-10-26 | 2013-02-06 | 北京科技大学 | Low-alkalinity synthetic slag for external refining of boiler tube steel |
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2014
- 2014-03-19 CN CN201410102562.7A patent/CN103849712A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101519713A (en) * | 2009-04-03 | 2009-09-02 | 江苏大学 | Slag adhesion preventing fluorine-free slag modifier for ladle refining, preparation method and using method |
| CN102051443A (en) * | 2010-12-31 | 2011-05-11 | 昆明理工大学 | High basicity fluorine-free RH (Ruhrstah-Heraeus) desulfurizer |
| CN102876842A (en) * | 2012-06-28 | 2013-01-16 | 辽宁天和科技股份有限公司 | Premelting slugging desulfurizer taking 12 CaO*7Al2O3 and 3CaO*5Al2O3 as main phases |
| CN102912082A (en) * | 2012-10-26 | 2013-02-06 | 北京科技大学 | Low-alkalinity synthetic slag for external refining of boiler tube steel |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110669894A (en) * | 2019-09-30 | 2020-01-10 | 鞍钢股份有限公司 | Fluorine-free KR desulfurizer and preparation method thereof |
| CN110669894B (en) * | 2019-09-30 | 2021-09-14 | 鞍钢股份有限公司 | Fluorine-free KR desulfurizer and preparation method thereof |
| CN111575442A (en) * | 2020-05-29 | 2020-08-25 | 鞍钢股份有限公司 | Low-melting-point high-efficiency desulfurizing agent and preparation and application methods thereof |
| CN111575442B (en) * | 2020-05-29 | 2021-10-22 | 鞍钢股份有限公司 | Low-melting-point high-efficiency desulfurizing agent and preparation and application methods thereof |
| CN111996335A (en) * | 2020-09-10 | 2020-11-27 | 河北工程大学 | Core-spun yarn core powder composition for high-aluminum steel production and processing method |
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Application publication date: 20140611 |