CN101045948A - Method for producing boron steel by smelting in converter - Google Patents
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- 229910000712 Boron steel Inorganic materials 0.000 title claims abstract description 30
- 238000003723 Smelting Methods 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 81
- 239000010959 steel Substances 0.000 claims abstract description 80
- 229910052796 boron Inorganic materials 0.000 claims abstract description 57
- 238000000034 method Methods 0.000 claims abstract description 54
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 51
- 238000007670 refining Methods 0.000 claims abstract description 32
- 238000005275 alloying Methods 0.000 claims abstract description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 33
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 31
- 239000002893 slag Substances 0.000 claims description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 17
- 238000010079 rubber tapping Methods 0.000 claims description 13
- 241001062472 Stokellia anisodon Species 0.000 claims description 11
- 239000000126 substance Substances 0.000 claims description 9
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 6
- 229910001200 Ferrotitanium Inorganic materials 0.000 claims description 6
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 2
- 239000002436 steel type Substances 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 11
- 239000001301 oxygen Substances 0.000 abstract description 11
- 229910052760 oxygen Inorganic materials 0.000 abstract description 11
- 239000007788 liquid Substances 0.000 abstract 1
- 229910052742 iron Inorganic materials 0.000 description 8
- 238000009749 continuous casting Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910014813 CaC2 Inorganic materials 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 229910052810 boron oxide Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- MOWNZPNSYMGTMD-UHFFFAOYSA-N oxidoboron Chemical class O=[B] MOWNZPNSYMGTMD-UHFFFAOYSA-N 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 1
- 229910008455 Si—Ca Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000011165 process development Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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Abstract
本发明属于钢铁冶炼领域，具体涉及一种转炉冶炼生产硼钢的方法。该方法是采用转炉冶炼→钢包脱氧、精炼→硼合金化的工艺生产硼钢。采用本发明生产硼钢，精炼结束后的钢液氧含量低，所得含硼钢的收得率高，为69.4％～91.8％，具有很好的应用前景。
The invention belongs to the field of steel smelting, and specifically relates to a method for producing boron steel by converter smelting. The method adopts the process of converter smelting → ladle deoxidation and refining → boron alloying to produce boron steel. When the boron steel is produced by the invention, the oxygen content of the steel liquid after refining is low, and the yield of the obtained boron-containing steel is high, which is 69.4% to 91.8%, and has a good application prospect.
Description
技术领域technical field
本发明属于钢铁冶炼领域，具体涉及一种转炉冶炼生产硼钢的方法。The invention belongs to the field of iron and steel smelting, and in particular relates to a method for producing boron steel by converter smelting.
背景技术Background technique
钢中微量硼的加入，其目的是为提高钢的淬透性，而对于硼钢的生产，由于硼元素的化学性质非常活泼，在合金化过程中极易与钢中的氧、氮等元素反应，从而导致硼的收得率较低且收得率不稳定，因此，对于硼钢生产，冶金工作者长期以来一直致力于硼合金化工艺的研究。The purpose of adding trace amounts of boron in steel is to improve the hardenability of steel. For the production of boron steel, due to the very active chemical properties of boron, it is very easy to combine with oxygen, nitrogen and other elements in steel during the alloying process. reaction, resulting in a low and unstable yield of boron. Therefore, for the production of boron steel, metallurgists have long been committed to the research of boron alloying process.
目前，硼钢的主要生产包括电炉和转炉两种工艺，其中以电炉工艺研究较多。由于电炉冶炼过程存在一个“还原期”，渣及钢液的氧含量低，处于良好的还原性气氛，硼的收得率相对较易控制，但在实际生产中同样存在收得率低、波动大的问题。如，《特殊钢》杂志(1992年第13卷5期，P56～58)介绍了西宁钢厂电炉生产40MnB钢，采用不同方法加入硼铁进行合金化，硼回收率波动在10％～65％；同样，《辽宁冶金》杂志(1997第5期，P21～24)介绍了抚钢采用电炉生产40MnBH钢的两种硼合金化效果，采用钢包加FeB工艺时硼收得率为7.5％～87.5％、平均43.4％，采用钢包喂FeB芯线工艺时硼收得率为23.5％～71.5％、平均50.9％；针对硼钢生产中硼收得率的问题，电炉冶炼在硼合金化工艺方面的研究，目前已取得了一定进展，如，《特殊钢》杂志(1997年第18卷2期，P30～32)介绍了西宁特钢公司“50t电炉-LF钢包炉-模铸”工艺流程开发的钢包喂B芯线工艺，B平均回收率为85.0％。At present, the main production of boron steel includes two processes: electric furnace and converter, among which the electric furnace process is more researched. Because there is a "reduction period" in the electric furnace smelting process, the oxygen content of slag and molten steel is low, and the boron yield is relatively easy to control in a good reducing atmosphere, but in actual production, the yield is also low and fluctuating. Big question. For example, "Special Steel" magazine (1992, Vol. 13, No. 5, P56-58) introduced that Xining Steel Plant produces 40MnB steel in an electric furnace, and adopts different methods to add ferroboron for alloying, and the boron recovery rate fluctuates between 10% and 65%. ; Similarly, "Liaoning Metallurgy" magazine (No. 5, 1997, P21～24) introduced the two kinds of boron alloying effects of Fuyang Iron and Steel Co., Ltd. to produce 40MnBH steel by electric furnace. %, 43.4% on average, and the boron yield is 23.5% to 71.5%, 50.9% on average when the ladle is used to feed the FeB core wire; in view of the problem of boron yield in the production of boron steel, the boron alloying process of electric furnace smelting Research has made some progress. For example, "Special Steel" magazine (1997, Vol. 18, No. 2, P30-32) introduced the process development of Xining Special Steel Company's "50t electric furnace-LF ladle furnace-die casting" process. The ladle feeds the B core wire process, and the average recovery rate of B is 85.0%.
但是，目前中国钢铁生产绝大多数采用转炉工艺，转炉炼钢的产量达到总产量的90％左右。由于转炉冶炼与电炉冶炼的差异性，电炉生产中的一些先进工艺难以在转炉适用，因此，近年来各本领域在转炉冶炼生产硼钢的工艺方面进行了一定的研究，例如，申请号为03134895.5的中国专利公开了一种采用“铁水脱硫扒渣→顶底复吹转炉冶炼→钢包脱氧合金化→钢包底吹氩精炼、精炼终点目标氧活度25×10-6～45×10-6→喂Al、Si-Ca线、硼线→连铸”的工艺生产硼钢，钢中硼含量范围0.005％～0.012％，硼的收得率40％～50％；《钢铁研究》杂志(2004年第4期，P18～22)报道了首钢采用80tLD转炉→LF钢水精炼，控制精炼到站氧活度小于20×10-6、渣中(FeO+MnO)≤3.0％→加Al、Ti，硼合金化→方坯连铸工艺生产含硼钢，B的平均收得率60％。虽然，转炉冶炼生产硼钢的工艺已基本成熟，但从所报道的文献资料来看，由于硼合金化前钢液氧含量较高，即脱氧效果较差，硼的收得率普遍偏低，低的硼收得率往往容易造成成品钢的硼含量低于钢种要求，给生产带来很大的难度。同时，低的硼收得率低意味着钢中硼的氧化物量(B2O3)增加，而这样将降低钢的淬透性，从而影响钢的最终性能。因此本领域急需开发出一种精炼结束后的钢液氧含量低、硼收得率高的转炉冶炼生产硼钢的方法。However, most of China's steel production currently uses the converter process, and the output of converter steelmaking reaches about 90% of the total output. Due to the differences between converter smelting and electric furnace smelting, some advanced processes in electric furnace production are difficult to apply to converters. Therefore, in recent years, certain researches have been carried out in various fields on the process of producing boron steel by converter smelting. For example, the application number is 03134895.5 The Chinese patent discloses a method of "desulfurization and slag removal of molten iron → smelting in converter with top-bottom combined blowing → deoxidation and alloying of ladle → argon blowing at the bottom of ladle for refining, and the target oxygen activity at the end of refining is 25×10-6～45×10-6→ Feed Al, Si-Ca wire, boron wire → continuous casting" to produce boron steel, the boron content range in the steel is 0.005% to 0.012%, and the yield of boron is 40% to 50%; "Steel Research" magazine (2004 Issue 4, P18～22) reported that Shougang adopts 80tLD converter → LF molten steel refining, controlled refining to station oxygen activity less than 20×10-6, slag (FeO+MnO) ≤ 3.0% → adding Al, Ti, boron Alloying → billet continuous casting process produces boron-containing steel, and the average yield of B is 60%. Although the process of producing boron steel by converter smelting is basically mature, according to the reported literature, due to the high oxygen content in molten steel before boron alloying, that is, the deoxidation effect is poor, and the yield of boron is generally low. A low boron yield often easily causes the boron content of the finished steel to be lower than the steel grade requirement, which brings great difficulty to production. At the same time, a low boron yield means that the amount of boron oxides (B 2 O 3 ) in the steel increases, which will reduce the hardenability of the steel, thus affecting the final performance of the steel. Therefore, there is an urgent need in this field to develop a method for producing boron steel by converter smelting with low oxygen content in molten steel after refining and high boron yield.
发明内容Contents of the invention
本发明所要解决的技术问题是提供一种转炉冶炼生产硼钢的方法。该方法包括以下步骤：The technical problem to be solved by the invention is to provide a method for producing boron steel by converter smelting. The method includes the following steps:
a、在转炉内初炼钢水；a. Initially smelt molten steel in the converter;
b、在出钢过程中，向钢包中加入脱氧剂进行预脱氧，并随出钢过程按每吨钢加入7.0～11.0kg的精炼渣料对钢水进行精炼，然后加铝对钢液进行终脱氧，并将钢液中酸溶铝控制在0.02％～0.04％；b. During the tapping process, add a deoxidizer to the ladle for pre-deoxidation, and add 7.0-11.0kg of refining slag per ton of steel during the tapping process to refine the molten steel, and then add aluminum to the molten steel for final deoxidation , and control the acid-soluble aluminum in molten steel at 0.02% to 0.04%;
c、然后将钢包运到LF炉进行再次精炼，精炼结束确保渣中FeO和MnO的总量≤2.0％，钢液的α[O]≤10×10-6；c. Then transport the ladle to the LF furnace for further refining. After refining, ensure that the total amount of FeO and MnO in the slag is ≤2.0%, and the α [O] of molten steel is ≤10×10 -6 ;
d、再次向钢包内加铝进行深脱氧，加完铝后，按钢种要求加入钛铁，最后按要求加入硼铁，连铸，即得。d. Add aluminum to the ladle again for deep deoxidation. After adding aluminum, add ferro-titanium according to the requirements of the steel type, and finally add ferro-boron as required, and continue casting.
其中，上述转炉冶炼生产硼钢的方法的步骤b中脱氧剂的理化指标为：按重量含有CaC2 60％～70％、Si 13％～20％、余量为铁。要求其其残碳指标1％～3％，发气量180～210L/kg。Wherein, the physical and chemical indicators of the deoxidizer in the step b of the method for producing boron steel by converter smelting are as follows: by weight, it contains 60%-70% of CaC 2 , 13%-20% of Si, and the balance is iron. It is required that its residual carbon index is 1% to 3%, and the gas generation volume is 180 to 210L/kg.
其中，上述方法步骤b中脱氧剂的加入量为每吨钢2.0～3.0kg。Wherein, the addition amount of the deoxidizer in step b of the above method is 2.0-3.0 kg per ton of steel.
其中，上述方法步骤b中渣料的主要成分的重量百分含量应控制在：Al2O3 40.0％～50.0％、SiO2 13.0％～19.0％，余量为CaO。要求其发气量为200～260L/kg。Wherein, the weight percentage of the main components of the slag in step b of the above method should be controlled at: Al 2 O 3 40.0%-50.0%, SiO 2 13.0%-19.0%, and the balance is CaO. The gas output is required to be 200-260L/kg.
其中，上述方法步骤b中渣料的加入量为每吨钢7.0～11.0kg。Wherein, the amount of slag added in step b of the above method is 7.0-11.0 kg per ton of steel.
其中，上述方法步骤d中加铝进行深脱氧的方式为喂铝线。Wherein, the method of adding aluminum in step d of the above method for deep deoxidation is to feed aluminum wires.
其中，上述方法步骤d中铝的加入量为每吨钢0.20～0.25kg。Wherein, the amount of aluminum added in step d of the above method is 0.20-0.25 kg per ton of steel.
本发明的生产方法的简要工艺流程为：转炉冶炼→钢包预脱氧和精炼、钢包终脱氧→LF炉精炼、深脱氧、合金化→连铸。The brief process flow of the production method of the present invention is: converter smelting→ladle pre-deoxidation and refining, ladle final deoxidation→LF furnace refining, deep deoxidation, alloying→continuous casting.
本发明方法可以按下述方式实施：The inventive method can be implemented in the following manner:
1)在转炉内冶炼钢水，转炉出钢到钢包的过程中每吨钢加入2.0～3.0k的复合脱氧剂进行预脱氧，脱氧剂的主要理化指标为重量百分比CaC2 60％～70％、Si 13％～20％、余量为铁，残碳指标为1％～3％、发气量180～210L/kg；同时，随出钢过程每吨钢加入7.0～11.0kg的精炼渣料对钢水进行精炼，加入精炼渣料的主要理化指标为：Al2O340.0％～50.0％、SiO2 13.0％～19.0％、余量为CaO、发气量200～260L/kg，并将钢液中酸溶铝含量控制在0.02％～0.04％。1) Molten steel is smelted in the converter, and 2.0-3.0k of compound deoxidizer is added per ton of steel during the process of tapping the converter to the ladle for pre-deoxidation. The main physical and chemical indicators of the deoxidizer are CaC 2 60%-70% by weight, Si 13% to 20%, the balance is iron, the residual carbon index is 1% to 3%, and the gas generation is 180 to 210L/kg; at the same time, 7.0 to 11.0kg of refining slag is added per ton of steel during the tapping process to carry out Refining, the main physical and chemical indicators of adding refining slag are: Al 2 O 3 40.0%~50.0%, SiO 2 13.0%~19.0%, the balance is CaO, gas generation 200~260L/kg, and acid-dissolved in molten steel The aluminum content is controlled at 0.02% to 0.04%.
2)然后将钢包运到LF炉再进行精炼，精炼结束确保渣中FeO和MnO的总量≤2.0％，钢液的氧活度(即α[O])值小于10×10-6。2) Then transport the ladle to the LF furnace for refining. After refining, ensure that the total amount of FeO and MnO in the slag is ≤2.0%, and the oxygen activity (ie α [O] ) of the molten steel is less than 10×10 -6 .
3)精炼完成后进行硼的合金化过程：首先再次向钢包内加铝进行深脱氧，加完铝后，按钢种成分要求加入钛铁，最后按要求加入硼铁，连铸，即得。3) Carry out boron alloying process after refining: first add aluminum to the ladle again for deep deoxidation, after adding aluminum, add ferro-titanium according to steel composition requirements, and finally add ferro-boron as required, continuous casting, that is.
实施本发明方法应注意的是，步骤a中预脱氧和终脱氧均在钢包内完成，但有顺序的区别，预脱氧在从转炉出钢的过程中边出钢边加脱氧剂进行，终脱氧则在出钢完成初次精炼后进行。脱氧剂中CaC2为脱氧的有效成分，本发明中脱氧剂的残碳指标是指采用CaC2+H2O-Ca(OH)2+C2H2反应后剩余的碳的量，该指标越低越好，说明脱氧剂的有效成分越高。Carrying out the method of the present invention should note that in the step a, pre-deoxidation and final deoxidation are all completed in the ladle, but there is a difference in order, and pre-deoxidation is carried out while tapping while adding deoxidizer in the process of tapping from the converter, and final deoxidation It is carried out after the initial refining of the steel is completed. In the deoxidizer, CaC2 is an effective component of deoxidation, and the residual carbon index of the deoxidizer in the present invention refers to the amount of remaining carbon after the reaction of CaC2 + H2O -Ca( OH ) 2 + C2H2 . The lower the better, the higher the effective ingredient of the deoxidizer.
本领域中，硼的收得率为：(出钢量×钢中硼含量)/硼加入量×100％；本领域公知，冶炼硼钢的过程中，如果硼的收得率低，则钢中硼的氧化物和氮化物含量会增高，这些物质的大量存在将严重影响钢的淬透性；收得率高，还可降低合金加入量，降低成本，节约资源，便于工艺参数的稳定控制；In this field, the yield of boron is: (tapping amount × boron content in steel) / boron addition × 100%; as known in the art, in the process of smelting boron steel, if the yield of boron is low, the steel The content of boron oxides and nitrides in the medium will increase, and the existence of a large number of these substances will seriously affect the hardenability of the steel; the high yield can also reduce the amount of alloy added, reduce costs, save resources, and facilitate stable control of process parameters ;
本发明的有益效果在于，采用本发明生产含硼钢具有钢液氧含量低(氧活度α[O]≤10×10-6，而现有技术普遍为20×10-6以上)，硼收得率高且收得率稳定等明显的优点。采用本发明方法对转炉钢水进行脱氧及精炼生产硼钢，能使硼收得率为69.4％～91.8％，而现有转炉工艺硼的收得率较高的仅在60％左右，大大优于现有技术。并且，本发明方法步骤简单，原料易得，充分利用了现有工艺流程和设备，不需要对设备进行添加或改造，具有很好的应用前景。The beneficial effect of the present invention is that the boron-containing steel produced by the present invention has low oxygen content in molten steel (oxygen activity α[O]≤10×10 -6 , while the prior art is generally above 20×10 -6 ), boron Obvious advantages such as high yield and stable yield. Adopting the method of the present invention to deoxidize and refine the molten steel of the converter to produce boron steel can make the yield of boron 69.4% to 91.8%, while the higher yield of boron in the existing converter process is only about 60%, which is much better than current technology. Moreover, the method of the invention has simple steps, easy-to-obtain raw materials, fully utilizes existing technological processes and equipment, does not need to add or modify equipment, and has good application prospects.
附图说明：Description of drawings:
图1为本发明方法的简要流程图Fig. 1 is a brief flow chart of the inventive method
以下通过具体实施方式，结合附图对本发明的上述内容再作进一步的详细说明。但不应将此理解为是对本发明的限制。The above-mentioned content of the present invention will be further described in detail below through specific implementation manners and in conjunction with the accompanying drawings. However, this should not be construed as a limitation of the present invention.
具体实施方式：Detailed ways:
实施例一使用本发明方法冶炼硼钢Embodiment one uses the method of the present invention to smelt boron steel
使用本发明方法冶炼含硼量0.0005％～0.0030％的硼钢：Using the method of the present invention to smelt boron steel with a boron content of 0.0005% to 0.0030%:
顶底复转炉内加入铁水135.2吨，初炼成钢水。Add 135.2 tons of molten iron into the top-bottom re-converter to initially smelt molten steel.
转炉出钢，出钢过程加入脱氧剂360kg(每吨钢约2.7kg)进行预脱氧，脱氧剂主要成分为CaC2 62.3％、Si 17.5％；出钢过程同时加入精炼渣料980kg(每吨钢约7.4kg)，渣料主要理化指标为：Al2O3 43.2％、SiO2 17.5％、发气量240L/kg；用喂线机喂铝线300m(计60kg)进行终脱氧，分析钢液酸溶铝为0.022％。Converter tapping, adding 360kg of deoxidizer (about 2.7kg per ton of steel) for pre-deoxidation during the tapping process, the main components of the deoxidizer are CaC 2 62.3%, Si 17.5%; About 7.4kg), the main physical and chemical indicators of the slag are: Al 2 O 3 43.2%, SiO 2 17.5%, gas generation 240L/kg; feed the aluminum wire 300m (60kg in total) with the wire feeder for final deoxidation, and analyze the acidity of molten steel Dissolved aluminum is 0.022%.
喂完铝线后，钢包运到LF炉进行精炼，精炼完毕，分析渣样为FeO 1.05％，MnO 0.62％，在线测定钢液α[O]为7×10-6；精炼完毕向钢包加铝33kg(吨钢约0.25kg)，加铝后加入钛铁130kg(Ti 40％)，最后加入硼铁16kg(B 23.0％)，连铸，即得。After feeding the aluminum wire, the ladle is transported to the LF furnace for refining. After refining, the analysis slag sample is FeO 1.05%, MnO 0.62%, and the online measurement of molten steel α [O] is 7×10 -6 ; after refining, add aluminum to the ladle 33kg (about 0.25kg per ton of steel), after adding aluminum, add 130kg of ferro-titanium (Ti 40%), and finally add 16kg of ferro-boron (B 23.0%), continuous casting, to obtain.
加硼前，取样分析钢中硼含量为0.0001％，成品钢分析硼含量为0.0019％，硼的收得率为69.4％。Before adding boron, the boron content in the steel was sampled and analyzed to be 0.0001%, the boron content in the finished steel was analyzed to be 0.0019%, and the yield of boron was 69.4%.
实施例二使用本发明方法冶炼硼钢Embodiment 2 Using the method of the present invention to smelt boron steel
使用本发明方法冶炼含硼量0.0005％～0.0030％的硼钢：Using the method of the present invention to smelt boron steel with a boron content of 0.0005% to 0.0030%:
向顶底复转炉内加入铁水140.5吨，初炼成钢水。Add 140.5 tons of molten iron into the top-bottom re-converter to initially smelt molten steel.
转炉出钢，出钢过程加入脱氧剂400kg(每吨钢约2.8kg)进行预脱氧，脱氧剂主要成分为CaC2 68.4％、Si 13.9％；出钢过程同时加入精炼渣料1000kg(每吨钢约7.1kg)，渣料主要理化指标为：Al2O345.8％、SiO216.2％、发气量260L/kg；用喂线机喂铝线300m(计60kg)进行终脱氧，分析钢液酸溶铝为0.029％。Converter tapping, adding 400kg of deoxidizer (about 2.8kg per ton of steel) for pre-deoxidation, the main components of deoxidizer are CaC 2 68.4%, Si 13.9%; adding refining slag 1000kg (per ton of steel About 7.1kg), the main physical and chemical indicators of the slag are: Al 2 O 3 45.8%, SiO 2 16.2%, gas production 260L/kg; feed the aluminum wire 300m (60kg in total) with the wire feeder for final deoxidation, and analyze the acidity of molten steel Dissolved aluminum is 0.029%.
喂完铝线后，钢包运到LF炉进行精炼，精炼完毕，分析渣样为FeO0.79％、MnO0.23％，在线测定钢液的α[O]为5×10-6；精炼完毕向钢包加铝30kg(每吨钢约0.21kg)，加铝后加入钛铁130kg(Ti 40％)，最后加入硼铁16kg(B 23.0％)，连铸，即得。After feeding the aluminum wire, the ladle was transported to the LF furnace for refining. After refining, the slag samples were analyzed as FeO0.79% and MnO0.23 %. Add 30kg of aluminum to the ladle (approximately 0.21kg per ton of steel), add 130kg of ferro-titanium (Ti 40%) after adding aluminum, and finally add 16kg of ferro-boron (23.0% of B), and perform continuous casting.
加硼前取样分析钢中硼含量为＜0.0001％，成品钢分析硼含量为0.0020％，硼的收得率为75.7％。The boron content in the steel is <0.0001% by sampling and analysis before adding boron, the boron content in the finished steel is 0.0020%, and the yield of boron is 75.7%.
实施例三使用本发明方法冶炼硼钢Embodiment 3 Using the method of the present invention to smelt boron steel
使用本发明方法冶炼含硼量0.0005％～0.0030％的硼钢：Using the method of the present invention to smelt boron steel with a boron content of 0.0005% to 0.0030%:
在顶底复转炉内加入铁水145.0吨，初炼成钢水。Add 145.0 tons of molten iron into the top-bottom re-converter to initially smelt molten steel.
转炉出钢，出钢过程加入脱氧剂420kg(每吨钢约2.9kg)进行预脱氧，脱氧剂主要成分为CaC2 65.3％、Si 14.6％；出钢过程加入精炼渣料1200kg(每吨钢约8.2kg)，渣料主要理化指标为：Al2O3 45.4％、SiO2 16.4％、发气量240L/kg；用喂线机喂Al线400m(计80kg)进行终脱氧，取钢样分析酸溶铝为0.035％。Converter tapping, adding 420kg of deoxidizer (about 2.9kg per ton of steel) for pre-deoxidation, the main components of deoxidizer are CaC 2 65.3%, Si 14.6%; 8.2kg), the main physical and chemical indicators of the slag are: Al 2 O 3 45.4%, SiO 2 16.4%, gas generation 240L/kg; use a wire feeder to feed Al wire 400m (80kg in total) for final deoxidation, take steel samples to analyze acid Dissolved aluminum is 0.035%.
喂完铝线后，钢包运到LF炉进行精炼，精炼完毕，分析渣样为FeO0.55％、MnO0.31％，在线检测钢液的α[O]为3×10-6；精炼完毕向钢包加铝30kg(吨钢约0.21kg)，加铝后加入钛铁130kg(Ti 40％)，最后加入硼铁16kg(B 23.0％)，连铸，即得。After feeding the aluminum wire, the ladle was transported to the LF furnace for refining. After refining, the slag samples were analyzed as FeO0.55% and MnO0.31%, and the α [O] of molten steel detected online was 3×10 -6 ; Add 30kg of aluminum to the ladle (approximately 0.21kg per ton of steel), add 130kg of ferro-titanium (Ti 40%) after adding aluminum, and finally add 16kg of ferro-boron (B 23.0%), and perform continuous casting to obtain the product.
加硼前，取样分析钢中硼含量为＜0.0001％，成品钢分析硼含量为0.0023％，硼的收得率为91.3％。Before adding boron, the boron content in the steel is <0.0001% by sampling and analysis, the boron content in the finished steel is 0.0023%, and the boron yield is 91.3%.
上述实例表明，采用本发明生产含硼钢，钢液氧含量大大低于现有技术，等明显的优点。能使硼收得率为69.4％～91.8％，且收得率稳定，也大大优于现有的转炉工艺。并且，本发明方法充分利用了现有工艺流程和设备，不需要对设备进行添加或改造，并且步骤简单，原料易得，具有很好的应用前景。The above examples show that the production of boron-containing steel by the present invention has obvious advantages such as the oxygen content of molten steel is much lower than that of the prior art. The boron recovery rate can be 69.4%-91.8%, and the recovery rate is stable, which is also much better than the existing converter process. Moreover, the method of the present invention makes full use of the existing process flow and equipment, does not need to add or modify equipment, has simple steps and easy-to-obtain raw materials, and has good application prospects.
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