CN104212941A - Novel aluminum-free composite deoxidizer for stainless steel smelting, and its preparation method - Google Patents
Novel aluminum-free composite deoxidizer for stainless steel smelting, and its preparation method Download PDFInfo
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- CN104212941A CN104212941A CN201410256096.8A CN201410256096A CN104212941A CN 104212941 A CN104212941 A CN 104212941A CN 201410256096 A CN201410256096 A CN 201410256096A CN 104212941 A CN104212941 A CN 104212941A
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Abstract
The invention discloses a novel aluminum-free composite deoxidizer for stainless steel smelting. The novel aluminum-free composite deoxidizer for stainless steel smelting comprises 35-55wt% of Si, 10-20wt% of Ca, 15-20wt% of Ba, 2-7wt% of Sr, 10-15wt% of Rh rare earth, 1wt% or less of C, 0.1wt% or less of S, 0.1wt% or less of P, and a small amount of Fe and inevitable impurities. The invention also provides a preparation method of the novel aluminum-free composite deoxidizer for stainless steel smelting. The novel aluminum-free composite deoxidizer for stainless steel smelting contains no aluminum, so no alumina inclusions exist in steel; the Ca element has strong affinity to oxygen, and also has strong affinity to S, so deoxidation and desulphurization effects are realized. Ba and Sr in the aluminum-free composite deoxidizer for stainless steel smelting make the inclusions in the steel spheroidized and modified and have strong deoxidation capability, and fine nonmetal inclusions generated in the solidification process of molten steel make one-time crystallized tissues more dispersed, so the dispersion and the uniformity of the crystallized tissues in the steel are improved.
Description
Technical field
The present invention relates to deoxidant for steelmaking technical field, particularly, relate to a kind of stainless steel smelting novel aluminum-free composite deoxidant and preparation method thereof.
Background technology
The Main Function of stainless steel smelting reductor reacts with the oxygen that dissolves in molten iron, mainly generates nonmetallic compound, form precipitation and float up in slag blanket, the molten iron being removed pure.
At present, stainless steel smelting reductor great majority contain aluminium, because present China stainless steel smelting achieves continuous casting mostly, reductor is high containing aluminium, because there is the existence of aluminium in deoxidation process, will produce aluminium sesquioxide, cause nozzle clogging, impact is produced and output.Meanwhile, do not need in some stainless kind containing aluminium, and have aluminium existence can cause there be being mingled with of aluminium sesquioxide in steel, and affect the quality of stainless steel.
Summary of the invention
One of technical problem to be solved by this invention is: provide a kind of stainless steel smelting novel aluminum-free composite deoxidant for the deficiencies in the prior art.
Two of technical problem to be solved by this invention is: provide a kind of preparation method for the preparation of above-mentioned stainless steel smelting novel aluminum-free composite deoxidant.
As a kind of stainless steel smelting novel aluminum-free composite deoxidant of a first aspect of the present invention, be made up of the component of following weight per-cent: silicon 35 ~ 55%, calcium 10 ~ 20%, barium 15 ~ 20%, strontium 2 ~ 7%, rhenium rare earth 10 ~ 15%, carbon≤1%, sulphur≤0.1%, phosphorus≤0.1% and a small amount of iron and inevitably impurity.
As the method for above-mentioned stainless steel smelting novel aluminum-free composite deoxidant of a second aspect of the present invention, comprise the following steps:
1) first drop into iron powder, steel cuttings, silicon barium, silicon barium strontium, silico-calcium, rhenium rare earth and coke or charcoal in backward medium-frequency induction furnace in the following order according to the weight ratio of said components, feed intake and want evenly, in-furnace temperature remains on 1500 ~ 1700 DEG C;
2) on medium-frequency induction furnace, sheaf space is lighted by a certain amount of inflammable gas;
3) when all raw materials are all changed, the main engine power of medium-frequency induction furnace is dropped to below 30KW and comes out of the stove;
4) add appropriate inflammable gas by indoor for sealing casting and light, after end to be combusted, by the aluminium alloy after melting in the indoor casting of sealing casting;
5) preserve after cooled alloy seal of casting packaging.
Chemical composition mainly silicon, calcium, barium, strontium, rhenium rare earth and iron and a small amount of impurity of stainless steel smelting novel aluminum-free composite deoxidant of the present invention, owing to not containing aluminium, without aluminium sesquioxide inclusion in steel, and calcium constituent is wherein not only very strong with the avidity of oxygen, and also very strong with the avidity of sulphur, play the effect of deoxidation and desulfurization.Barium in stainless steel smelting aluminium-free deoxidant and strontium can make steel inclusion nodularization sex change, itself has again very strong deoxidizing capacity simultaneously, and the thin non-metallic inclusion produced in solidification of molten steel process, impel primary solidification structure's more disperse, dispersity and the uniformity coefficient of steel crystal structure can be improved.
Embodiment
The technique means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, setting forth the present invention further.
Embodiment 1
A kind of stainless steel smelting novel aluminum-free composite deoxidant, is made up of the component of following weight per-cent: silicon 35%, calcium 20%, barium 20%, strontium 7%, rhenium rare earth 15%, carbon≤0.5%, sulphur≤0.03%, phosphorus≤0.03% and a small amount of iron and inevitably impurity.
For the method for above-mentioned stainless steel smelting novel aluminum-free composite deoxidant, comprise the following steps:
1) first drop into iron powder, steel cuttings, silicon barium, silicon barium strontium, silico-calcium, rhenium rare earth and coke or charcoal in backward medium-frequency induction furnace in the following order according to the weight ratio of said components, feed intake and want evenly, in-furnace temperature remains on 1500 DEG C;
2) on medium-frequency induction furnace, sheaf space is lighted by a certain amount of inflammable gas;
3) when all raw materials are all changed, the main engine power of medium-frequency induction furnace is dropped to 25KW and comes out of the stove;
4) add appropriate inflammable gas by indoor for sealing casting and light, after end to be combusted, by the aluminium alloy after melting in the indoor casting of sealing casting;
5) preserve after cooled alloy seal of casting packaging.
Embodiment 2
A kind of stainless steel smelting novel aluminum-free composite deoxidant, is made up of the component of following weight per-cent: silicon 45%, calcium 15%, barium 17%, strontium 5%, rhenium rare earth 12%, carbon≤1%, sulphur≤0.1%, phosphorus≤0.1% and a small amount of iron and inevitably impurity.
As the method for above-mentioned stainless steel smelting novel aluminum-free composite deoxidant of a second aspect of the present invention, comprise the following steps:
1) first drop into iron powder, steel cuttings, silicon barium, silicon barium strontium, silico-calcium, rhenium rare earth and coke or charcoal in backward medium-frequency induction furnace in the following order according to the weight ratio of said components, feed intake and want evenly, in-furnace temperature remains on 1600 DEG C;
2) on medium-frequency induction furnace, sheaf space is lighted by a certain amount of inflammable gas;
3) when all raw materials are all changed, the main engine power of medium-frequency induction furnace is dropped to 27KW and comes out of the stove;
4) add appropriate inflammable gas by indoor for sealing casting and light, after end to be combusted, by the aluminium alloy after melting in the indoor casting of sealing casting;
5) preserve after cooled alloy seal of casting packaging.
Embodiment 3
A kind of stainless steel smelting novel aluminum-free composite deoxidant, is made up of the component of following weight per-cent: silicon 55%, calcium 10%, barium 15%, strontium 2%, rhenium rare earth 10%, carbon≤0.5%, sulphur≤0.05%, phosphorus≤0.05% and a small amount of iron and inevitably impurity.
As the method for above-mentioned stainless steel smelting novel aluminum-free composite deoxidant of a second aspect of the present invention, comprise the following steps:
1) first drop into iron powder, steel cuttings, silicon barium, silicon barium strontium, silico-calcium, rhenium rare earth and coke or charcoal in backward medium-frequency induction furnace in the following order according to the weight ratio of said components, feed intake and want evenly, in-furnace temperature remains on 1700 DEG C;
2) on medium-frequency induction furnace, sheaf space is lighted by a certain amount of inflammable gas;
3) when all raw materials are all changed, the main engine power of medium-frequency induction furnace is dropped to 30KW and comes out of the stove;
4) add appropriate inflammable gas by indoor for sealing casting and light, after end to be combusted, by the aluminium alloy after melting in the indoor casting of sealing casting;
5) preserve after cooled alloy seal of casting packaging.
Claims (2)
1. a stainless steel smelting novel aluminum-free composite deoxidant, it is characterized in that, be made up of the component of following weight per-cent: silicon 35 ~ 55%, calcium 10 ~ 20%, barium 15 ~ 20%, strontium 2 ~ 7%, rhenium rare earth 10 ~ 15%, carbon≤1%, sulphur≤0.1%, phosphorus≤0.1% and a small amount of iron and inevitably impurity.
2., for the preparation of a method for stainless steel smelting novel aluminum-free composite deoxidant according to claim 1, it is characterized in that, comprise the following steps:
1) first drop into iron powder, steel cuttings, silicon barium, silicon barium strontium, silico-calcium, rhenium rare earth and coke or charcoal in backward medium-frequency induction furnace in the following order according to the weight ratio of said components, feed intake and want evenly, in-furnace temperature remains on 1500 ~ 1700 DEG C;
2) on medium-frequency induction furnace, sheaf space is lighted by a certain amount of inflammable gas;
3) when all raw materials are all changed, the main engine power of medium-frequency induction furnace is dropped to below 30KW and comes out of the stove;
4) add appropriate inflammable gas by indoor for sealing casting and light, after end to be combusted, by the aluminium alloy after melting in the indoor casting of sealing casting;
5) preserve after cooled alloy seal of casting packaging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410256096.8A CN104212941A (en) | 2014-06-10 | 2014-06-10 | Novel aluminum-free composite deoxidizer for stainless steel smelting, and its preparation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410256096.8A CN104212941A (en) | 2014-06-10 | 2014-06-10 | Novel aluminum-free composite deoxidizer for stainless steel smelting, and its preparation method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1299880A (en) * | 2000-12-26 | 2001-06-20 | 袁希德 | Aluminium-free deoxidant for steel smelting |
| CN1814817A (en) * | 2006-02-27 | 2006-08-09 | 沈阳东北大学冶金技术研究所 | Molten-steel deoxidation agent |
| CN101353714A (en) * | 2007-07-23 | 2009-01-28 | 才会成 | Aluminum-free deoxidizing agent |
| CN101435007A (en) * | 2007-11-15 | 2009-05-20 | 张雪柏 | Silicon-magnesium-calcium-strontium-barium-ferrum alloy |
-
2014
- 2014-06-10 CN CN201410256096.8A patent/CN104212941A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1299880A (en) * | 2000-12-26 | 2001-06-20 | 袁希德 | Aluminium-free deoxidant for steel smelting |
| CN1814817A (en) * | 2006-02-27 | 2006-08-09 | 沈阳东北大学冶金技术研究所 | Molten-steel deoxidation agent |
| CN101353714A (en) * | 2007-07-23 | 2009-01-28 | 才会成 | Aluminum-free deoxidizing agent |
| CN101435007A (en) * | 2007-11-15 | 2009-05-20 | 张雪柏 | Silicon-magnesium-calcium-strontium-barium-ferrum alloy |
Non-Patent Citations (1)
| Title |
|---|
| 刘栋 等: "转炉炼钢脱氧工艺的优化", 《技术经济》 * |
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Application publication date: 20141217 |
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