CN1221672C - Silicon-manganese-calcium alloy and its production method - Google Patents
Silicon-manganese-calcium alloy and its production method Download PDFInfo
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- CN1221672C CN1221672C CN 01120358 CN01120358A CN1221672C CN 1221672 C CN1221672 C CN 1221672C CN 01120358 CN01120358 CN 01120358 CN 01120358 A CN01120358 A CN 01120358A CN 1221672 C CN1221672 C CN 1221672C
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Abstract
The present invention relates to Si-Mn-Ca alloy which is used as a steel-smelting deoxidizing agent. The present invention is composed of 33 to 47% of Mn, 30 to 45% of Si, 1 to 15% of Ca, at most 0.3% of C, at most 0.04% of P and Fe and unavoidable impurities as the rest. The present invention also relates to a method for producing the alloy, which comprises the procedures: ferric silicon is produced by an ore heating furnace, particularly an ore heating furnace with the low frequency of 0.5Hz to 12.5Hz, and then, Mn-Si alloy, lime and calcium fluoride are added to the ferric silicon molten pool of the ore heating furnace; molten metal in the ore heating furnace is flushed into a hot metal ladle of Si-Ca alloy.
Description
Technical field
The present invention relates to a kind of calcium-manganesesilicon alloy that is used as calcium-manganesesilicon alloy, the especially low phosphorus and low carbon of steel making deoxidant; The invention still further relates to the production method of this alloy.
Background technology
Traditional silicomanganese aluminium alloy is adopted by Steel industry for many years owing to have the advantage that fusing point is low, deoxidation products is easy to float in molten steel always.But for aluminium the steel grade of strict demand is arranged, as the cold-rolling stainless steel of 304 types, this aluminiferous silicomanganese is just inapplicable, so Steel industry, especially produces stainless producer and is badly in need of a kind of novel alloy that can replace traditional silicomanganese aluminium.The desirable substitute products of described silicomanganese aluminium alloy at first are calcium-manganesesilicon alloys.But, thereby, cause the efflorescence of this alloy because of separating out of calcium when smelting the calcium-manganesesilicon alloy that comes out when cooling off because the solubleness of calcium in silicon and manganese is very limited.Therefore it is reasonable to design a kind of composition, and the calcium-manganesesilicon alloy of energy long-term storage is a problem anxious to be solved.
In addition, even design above-mentioned calcium-manganesesilicon alloy, how it is produced in economical and efficient ground, then is another problem.With the ore deposit heat furnace method silicon, manganese and calcium are reduced simultaneously, then be difficult to control required alloy ingredient; Produce this alloy with the induction furnace hot-metal process, then because of smelting temperature is low, loss is big, cost height, and inclusion content height in the alloy of producing with this method, so the above-mentioned calcium-manganesesilicon alloy of the also inapplicable production of induction furnace hot-metal process.
Summary of the invention
Thereby, the object of the present invention is to provide a kind of calcium-manganesesilicon alloy;
Another object of the present invention is to provide the production method of above-mentioned alloy.
The consisting of of calcium-manganesesilicon alloy of the present invention (by weight percentage):
Mn：33-47％ Si：30-45％ Ca：1-15％
Be Fe and unavoidable impurities surplus C≤0.3% P≤0.04%.
The production technique of above-mentioned calcium-manganesesilicon alloy is as follows:
1) silica, blue charcoal, steel cuttings are smelted into ferrosilicon in batches in the hot stove in ore deposit; 2) in the hot stove in described ore deposit, behind the formation ferrosilicon molten bath, add silicon-manganese alloy, lime and fluorite to described molten bath, so that make the molten metal in the molten bath contain manganese and make the molten bath dephosphorization; 3) treat step 2) in after added material fully melts and reacts, the molten metal in the stove is gone out in the hot metal ladle that fills silicon-calcium alloy; Warp is cast ingot towards converting the calcium-manganesesilicon alloy that forms in will wrapping again.
Described silicomanganese, such as, be to contain Mn68%, contain the silicomanganese of Si18%.
The hot stove in described ore deposit preferably operating frequency is the hot stove in ore deposit of 0.5-12.5Hz.The characteristics of the hot stove in this low frequency ore deposit are the power factor height, and electrode is stable during work, thereby can insert deeply and be stabilized on the optimum position; The stronger magnetic field force that low-frequency power produced stirs the molten iron quick heating thereby make molten iron be subjected to intensive, and can prevent the rise of furnace bottom.The These characteristics of the hot stove in low frequency ore deposit is for of the present invention, add silicomanganese in the middle of needing, slag making dephosphorization and be very favourable with the smelting technology that molten metal bath dashes molten silicocalcium.
The composition of calcium-manganesesilicon alloy of the present invention designs the main solubleness of calcium in silicomanganese of considering, and is too high as if calcic in this alloy, when then alloy cools off, owing to the efflorescence that causes this alloy of separating out of part calcium.The inventor finds that through long-term exploration for keeping this silicomanganese at normal temperatures through not efflorescence of prolonged preservation, the while guarantees enough again, can replace the deoxidizing capacity of aluminium, and the scope of its calcium is confirmed as 1-15% (weight).
Consideration for the content range of silicon and manganese, mainly be conceived under the situation of given silicon, manganese content range, it is low to form fusing point easily, size is big, the deoxidation products that is easy in molten steel, float, when silicone content is that 32-40% (weight), manganese content are under the situation of 35-45% (weight), they and above-mentioned calcium can obtain comparatively ideal deoxidation effect together.
Qualification for carbon and phosphorus content mainly is for the consideration that alleviates the steel making working procedure load.
When calcium-manganesesilicon alloy of the present invention is used to deoxidation, can effectively (Al) be controlled at below 0.01% (weight), and its deoxidizing capacity is also a little more than the deoxidizing capacity of the silicomanganese aluminium alloy of routine.
With the technology of production calcium-manganesesilicon alloy of the present invention, can stably produce qualified calcium-manganesesilicon alloy by the composition requirement.
Embodiment
The invention is further illustrated by the following examples.
Embodiment 1.
To contain SiO
2Greater than 98%, contain Al
2O
3Silica less than 1.5% and contain fixed carbon greater than 80%, ash be less than 6% blue charcoal and the cleaning steel cuttings weight ratio by 200: 128: 50, divides 6 batches to smelt in operating frequency is the hot stove in low frequency ore deposit of 0.5-12.5Hz.Treat that adding the trade mark behind the formation crucible district in the stove is silicomanganese, lime and the fluorite of FeMn68Si18, the add-on of silicomanganese is pressed the manganese content control in the finished product.Continue then to smelt 2-2.5 hour.To contain the silicocalcium that Ca28% contains Si60% before coming out of the stove and add in the hot metal ladle, its quantity depends on the Ca content in the finished product, pours and makes the calcium silicon fusing in this hot metal ladle smelting good molten metal in the hot stove in this ore deposit then.Mixed molten metal is cast as ingot, obtains a kind of calcium-manganesesilicon alloy through fragmentation after the cooling, its composition is (weight)
Si 38％ Mn 35.8％ Ca 4.5％ P 0.032％ C 0.14％
Surplus the S 0.008% Fe and unavoidable impurities.
This alloy is stored at normal temperatures after 6 months and is not seen efflorescence.
Embodiment 2
In 30 tons AOD stove, smelt 6 stoves, 304 cold-rolling stainless steels.When oxygen blast reaches end point carbon, carry out deoxidation and alloying with calcium-manganesesilicon alloy of the present invention, ferrosilicon and ferrochrome.The composition of described calcium-manganesesilicon alloy sees Table 1
The composition of table 1 Mn-Si-Ca alloy (% weight)
Described Mn-Si-Ca alloy, the add-on of Si-Fe and Cr-Fe and the oxygen level in the finished product and contain Al amount and see Table 2.
Table 2
| Heat | Alloy addition (kg) | [Al] in the Finished Steel and [O] content (% weight) | |||
| Cr-Fe | Si-Fe | Mn-Si-Ca | [Al] | [O] | |
| 1 | 280 | 470 | 620 | 0.008 | 0.0065 |
| 2 | 342 | 633 | 0.007 | 0.0078 | |
| 3 | 1680 | 260 | 756 | 0.01 | |
| 4 | 240 | 240 | 540 | 0.008 | |
| 5 | 806 | 348 | 700 | 0.008 | 0.0054 |
| 6 | 223 | 410 | 570 | 0.005 | |
P as can be known from Table 2: [Al] in the Finished Steel all is not more than 0.01%;
[O] average out to 0.0066% in the Finished Steel.
Embodiment 3
In 30 tons AOD stove, smelt 6 stoves, 304 cold-rolling stainless steels.When carbon is reached home in oxygen blast, carry out deoxidation and alloying with conventional silicomanganese aluminium alloy, ferrosilicon and ferrochrome.Described Mn-Si-Al alloy, the Al amount that contains in the add-on of Si-Fe and Cr-Fe and the finished product, oxygen level sees Table 3.
| Heat | Alloy addition (kg) | (Al) (o) content (% weight) in the Finished Steel | |||
| Cr-Fe | Si-Fe | Mn-Si-Al | 〔Al〕 | 〔O〕 | |
| 1 | 710 | 530 | 558 | 0.01 | |
| 2 | 463 | 398 | 600 | 0.008 | 0.0071 |
| 3 | 110 | 462 | 450 | 0.1 | 0.0088 |
| 4 | 630 | 400 | 638 | 0.1 | |
| 5 | 400 | 510 | 0.007 | 0.0097 | |
| 6 | 410 | 540 | 0.1 | ||
As can be known from Table 3, there is (Al) content of 4 stove Finished Steels to surpass 0.01%;
The mean value that contains (O) amount of 3 stove Finished Steels is 0.0085%
Conclusion: Mn-Si-Ca alloy of the present invention all is better than conventional Mn-Si-Al content aspect (Al) of control in the steel, (o).
Claims (7)
1, a kind of silicon-manganese-calcium alloy as molten-steel deoxidation agent, it consists of by weight percentage: Mn:33-47%; Si:30-45%; Ca:1-15%; C≤0.3%; P≤0.04%, the Fe of surplus and unavoidable impurities.
2, the method for the silicon-manganese-calcium alloy of production claim 1, this method comprises the steps:
1) silica, blue charcoal, steel cuttings are smelted into ferrosilicon in batches in the hot stove in ore deposit;
2) in the hot stove in described ore deposit, behind the formation ferrosilicon bath, add silicon-manganese alloy, lime and fluorite to described molten bath, so that make the molten metal in the molten bath contain manganese and make the molten bath dephosphorization;
3) treat in the step (2) that institute adds material and fully melts and react after, the molten metal in the stove is gone out in the hot metal ladle that fills silicon-calcium alloy, make described silicon-manganese-calcium alloy, it consists of by weight percentage: Mn:33-47%; Si:30-45%; Ca:1-15%; C≤0.3%; P≤0.04%, the Fe of surplus and unavoidable impurities.
3, the method for the described production silicon-manganese-calcium alloy of claim 2, the hot stove in wherein said ore deposit are that operating frequency is the hot stove in low frequency ore deposit of 0.5-12.5Hz.
4, the method for the described production silicon-manganese-calcium alloy of claim 2, the silica described in the step 1) wherein, the weight ratio of blue charcoal and steel cuttings is 200: 128: 50.
5, the method for the described production silicon-manganese-calcium alloy of claim 2, wherein step 2) in added manganese-silicon alloy contain 68% Mn and 18% Si.
6, the method for the described production silicon-manganese-calcium alloy of claim 2, wherein the silicon described in the step 3)-calcium alloy calcic 28% contains Si60%.
7, the method for the described production silicon-manganese-calcium alloy of claim 2, wherein step 2) time length be 2-2.5 hour.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 01120358 CN1221672C (en) | 2001-08-15 | 2001-08-15 | Silicon-manganese-calcium alloy and its production method |
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| CN 01120358 CN1221672C (en) | 2001-08-15 | 2001-08-15 | Silicon-manganese-calcium alloy and its production method |
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| CN1221672C true CN1221672C (en) | 2005-10-05 |
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| CN109055665A (en) * | 2018-08-08 | 2018-12-21 | 鞍钢股份有限公司 | A kind of compound dephosphorization method of Mn series alloy |
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Granted publication date: 20051005 Termination date: 20130815 |