CN103849713A - Refining slag for 20 Cr structural alloy steel and preparation method thereof - Google Patents
Refining slag for 20 Cr structural alloy steel and preparation method thereof Download PDFInfo
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- CN103849713A CN103849713A CN201410102561.2A CN201410102561A CN103849713A CN 103849713 A CN103849713 A CN 103849713A CN 201410102561 A CN201410102561 A CN 201410102561A CN 103849713 A CN103849713 A CN 103849713A
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- refining slag
- slag
- mgo
- cao
- alloy steel
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 refining slag for 20 Cr structural alloy steel and a preparation method thereof. The granularity of the refining slag is 15-35mm, and the refining slag comprises the following components in percentage by weight: 55-60% of CaO, 13-20% of SiO2, 13-18% of Al2O3, 6-10% of MgO, 5-10% of CaF2, less than or equal to 1% of TFe and the balance of impurities. The preparation method of the refining slag comprises that mineral ore raw materials containing CaO, SiO2, Al2O3, MgO and CaF2 are crushed and blended and then moulding and crushing are carried out, so that the refining slag finished product is obtained. The preparation method of the refining slag is simple, and the prepared refining slag has the advantages of 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 refining slag and preparation method thereof, belong to steelmaking technical field.
Background technology
20Cr structural alloy 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.
The environment for use of 20Cr structural alloy steel determines that its steel must have good purity, with the safety and stability of guaranteeing to use.[S], [O] content in purity of steel 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.
Along with the continuous progress of converter smelting structural alloy steel level, 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 assurance Molten Steel Cleanliness.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 and refining slag basicity most important for producing high cleanliness 20Cr structural alloy steel.
Tradition 20Cr refining adopts the universal CaO-SiO of low-carbon (LC) more
2-Al
2o
3slag system refining slag, this scorification slag is slow, go to be mingled with limited in one's ability and lining erosion is serious, causes that 20Cr purity of steel is on the low side, unstable properties, is difficult to meet fast-developing economic society demand.The present invention is directed to 20Cr steel clamp foreign material characteristic, optimize slag system ingredient's proportioning, add appropriate MgO, CaF
2, significantly strengthen refining slag removal of inclusions ability, improve purity of steel, reach stability and high efficiency and refining effect with low cost.
Summary of the invention
One object of the present invention is to provide a kind of 20Cr structural alloy steel refining slag, to control A in steel, B, C, D and Ds type impurity rank, improves the purity of 20Cr structural alloy steel.
Second object of the present invention is to provide the preparation method of a kind of 20Cr structural alloy steel refining slag.
For realizing above-mentioned first object, the technical solution used in the present invention is:
A kind of 20Cr structural alloy steel refining slag, the granularity of described refining slag is 15～35mm, each compositions in weight percentage is: 55～60%CaO, 13～20%SiO
2, 13～18%Al
2o
3, 6～10%MgO, 5～10%CaF
2, TFe≤1%, surplus is impurity.
Further, the granularity of described refining slag is 15～25mm, and each compositions in weight percentage is: 56～58%CaO, 13～15%SiO
2, 15～17%Al
2o
3, 8～10%MgO, 5～7%CaF
2, 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, CaF
2ore 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, 13～20%SiO
2, 13～18%Al
2o
3, 6～10%MgO, 5～10%CaF
2, 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 ℃～1600 ℃, 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, CaF
2ore be quickened lime, calcium aluminate, wollastonite, rhombspar and fluorite.
20Cr structural alloy steel of the present invention is with in refining slag:
CaO, is the chief component of refining slag, works to regulate refining slag basicity, 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 is controlled at 13～20%.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 is controlled at 13～18%.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, MgO content is controlled at 6～10%.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.
CaF
2, Main Function is working the slag fusing point, CaF in the present invention
2content is controlled at 5～10%.CaF
2too high levels can cause slag liquid excessively rare, causes the difficulty of skimming; CaF
2content is too low can causing slag difficulty.
The present invention compared with prior art has following beneficial effect:
In refining slag of the present invention, contain CaO and the SiO of high level
2, both cooperatively interact, and have not only been conducive to improve slag desulfurization, absorption is mingled with ability but also has guaranteed that slag has good mobility; CaF
2add, reduced slag melting, improved change slag speed and production efficiency; Adding of MgO reduces lining erosion greatly, reduced smelting cost.Therefore, having advantages of of the present invention slag speed is fast, removal of inclusions ability is strong, lining erosion is light and sweetening power is strong.
Embodiment
Below in conjunction with embodiment, the present invention is further detailed explanation.
The preparation method of refining slag of the present invention is: will have CaO, SiO
2, Al
2o
3, MgO and CaF
2the raw material of composition: quickened lime, calcium aluminate, wollastonite, rhombspar and fluorite make through fragmentation → batching → batch mixing → molding procedure the refining slag that granularity is 15～35mm, and in described refining slag, each compositions in weight percentage is: 55～60%CaO, 13～20%SiO
2, 13～18%Al
2o
3, 6～10%MgO, 5～10%CaF
2, 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 CaF
2when the raw material of composition, as: Wingdale, quartzite, bauxitic clay, light dolomite and fluorite, 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 refining slag adds ladle at LF refining process.
The each embodiment of table 1 and the granularity of comparative example refining slag and the weight percent content of each component
| Project | CaO | SiO 2 | Al 2O 3 | MgO | CaF 2 | Granularity |
| Embodiment 1 | 55.0 | 14.0 | 15.0 | 6.5 | 6.5 | 35 |
| Embodiment 2 | 60.0 | 13.0 | 13.0 | 6.0 | 5 | 25 |
| Embodiment 3 | 55.3 | 13.2 | 13.3 | 6.7 | 10 | 20 |
| Embodiment 4 | 55.0 | 20.0 | 13.0 | 6.0 | 5.0 | 15 |
| Embodiment 5 | 55.1 | 13.0 | 18.0 | 6.5 | 6.0 | 22 |
| Embodiment 6 | 56.1 | 13.5 | 14.0 | 10 | 5.0 | 30 |
| 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 | 20 |
| Comparative example 4 | 45.4 | 12.0 | 17.5 | 11.4 | 10.4 | 30 |
Each comparative example is identical with the technique that embodiment produces 20Cr structural alloy steel, and difference is only that in 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 refining slag of the each embodiment of table 2 and comparative example is produced the level of control of the 20Cr alloy structure steel inclusion obtaining
| Project | A | B | C | D | Ds | Inclusion evaluation |
| Embodiment 1 | 0 | 0.5 | 0 | 1 | 0.5 | Good |
| Embodiment 2 | 0.5 | 0 | 0 | 1 | 0.5 | Good |
| Embodiment 3 | 0 | 0.5 | 0.5 | 0.5 | 0.5 | Special excellent |
| Embodiment 4 | 0 | 0 | 0.5 | 0.5 | 0.5 | Special excellent |
| Embodiment 5 | 0.5 | 0 | 1 | 0 | 0 | Good |
| Embodiment 6 | 0.5 | 0 | 0.5 | 0 | 0 | Special excellent |
| Comparative example 1 | 1 | 1 | 1 | 1 | 0.5 | Qualified |
| Comparative example 2 | 1.5 | 1.5 | 1 | 1 | 1 | Qualified |
| Comparative example 3 | 1 | 1 | 0.5 | 1.5 | 1 | Qualified |
| Comparative example 4 | 2 | 2 | 1 | 1.5 | 1 | Qualified |
As shown in Table 2, use the 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, for 20Cr alloy structure steel quality provides favourable guarantee.
The refining slag that uses the present invention to prepare is produced the 20Cr structural alloy steel refining slag obtaining and is had advantages of that sweetening power is strong, lining erosion is little, change slag speed is fast and inclusion removal ability is strong, can significantly reduce steel inclusion rank, improve purity of steel, the quality that improves 20Cr structural alloy steel is had to obvious effect.
Claims (4)
1. a 20Cr structural alloy steel 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, 13～20%SiO
2, 13～18%Al
2o
3, 6～10%MgO, 5～10%CaF
2, TFe≤1%, surplus is impurity.
2. 20Cr structural alloy steel 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: 56～58%CaO, 13～15%SiO
2, 15～17%Al
2o
3, 8～10%MgO, 5～7%CaF
2, TFe≤1%, surplus is impurity.
3. the preparation method of 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, CaF
2ore 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, 13～20%SiO
2, 13～18%Al
2o
3, 6～10%MgO, 5～10%CaF
2, 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 ℃～1600 ℃, 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 refining slag for 20Cr structural alloy steel according to claim 3, is characterized in that: described containing CaO, SiO
2, Al
2o
3, MgO, CaF
2ore be quickened lime, calcium aluminate, wollastonite, rhombspar and fluorite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410102561.2A CN103849713A (en) | 2014-03-19 | 2014-03-19 | Refining slag for 20 Cr structural alloy steel and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410102561.2A CN103849713A (en) | 2014-03-19 | 2014-03-19 | Refining slag for 20 Cr structural alloy steel and preparation method thereof |
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| CN103849713A true CN103849713A (en) | 2014-06-11 |
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|---|---|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109628695A (en) * | 2019-01-29 | 2019-04-16 | 新疆中合大正冶金科技有限公司 | A kind of technique using the production LF submerged arc refining agent of electrolytic aluminium slag from delining |
| CN111676346A (en) * | 2020-07-28 | 2020-09-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Refining slag for titanium-containing steel and preparation method and use method thereof |
| CN117587196A (en) * | 2023-11-07 | 2024-02-23 | 阳江市大地环保建材有限公司 | Low-alkalinity refining slag system for removing sulfur element, preparation method and molten steel refining method |
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| CN102864285A (en) * | 2012-10-26 | 2013-01-09 | 北京科技大学 | High-alkalinity synthetic slag for pipeline steel secondary refining |
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2014
- 2014-03-19 CN CN201410102561.2A patent/CN103849713A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN102864285A (en) * | 2012-10-26 | 2013-01-09 | 北京科技大学 | High-alkalinity synthetic slag for pipeline steel secondary refining |
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| 李阳等: "CaO-Al2O3基精炼渣对钢液脱氧的影响", 《钢铁研究学报》, vol. 14, no. 5, 31 October 2002 (2002-10-31), pages 12 - 15 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109628695A (en) * | 2019-01-29 | 2019-04-16 | 新疆中合大正冶金科技有限公司 | A kind of technique using the production LF submerged arc refining agent of electrolytic aluminium slag from delining |
| CN111676346A (en) * | 2020-07-28 | 2020-09-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Refining slag for titanium-containing steel and preparation method and use method thereof |
| CN117587196A (en) * | 2023-11-07 | 2024-02-23 | 阳江市大地环保建材有限公司 | Low-alkalinity refining slag system for removing sulfur element, preparation method and molten steel refining method |
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Application publication date: 20140611 |