CN102851447A - Outside-furnace refining production method of steel used in carbon steel welding wire - Google Patents
Outside-furnace refining production method of steel used in carbon steel welding wire Download PDFInfo
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- CN102851447A CN102851447A CN2012103356964A CN201210335696A CN102851447A CN 102851447 A CN102851447 A CN 102851447A CN 2012103356964 A CN2012103356964 A CN 2012103356964A CN 201210335696 A CN201210335696 A CN 201210335696A CN 102851447 A CN102851447 A CN 102851447A
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Abstract
The invention relates to an outside-furnace refining production method of steel used in carbon steel welding wire. The invention belongs to the technical field of steelmaking. The process flow of the method comprises the steps that: molten steel obtained by combined blowing converter smelting is adopted; in-ladle deoxidization alloying is carried out during tapping; molten steel is lifted to an argon blowing station; molten steel components are regulated through ladle argon bottom blowing at the argon blowing station, and indicators such as oxygen content in steel are controlled; and after components, temperature and cleanliness are appropriate after treatment, the molten steel is lifted to a square billet casting machine for casting. According to the invention, a low-cost ladle argon bottom blowing refining method is used for replacing an original LF refining method. Molten steel component regulation, desulphurization and impurity removing of the molten steel are realized through entire process control. Therefore, qualified molten steel can be produced stably. The method has the advantage that the method can be used for replacing the LF outside-furnace refining method for producing various steel used in carbon steel welding wire. Chemical components of the steel material satisfy requirements of a standard, and the contents are stable. The mass percentage of C is plus or minus 0.02%, the mass percentages of Si and Mn are plus or minus 0.05%, the mass percentages of P and S are no higher than 0.020%, and the mass percentage of oxygen is no higher than 0.0040%. The cost is reduced by 80 Yuan per ton of steel.
Description
Technical field
The invention belongs to steelmaking technical field, the external refining production method of a kind of carbon steel welding wire with steel particularly is provided, be applied to the production that various types of carbon steel welding wire is used steel.
Background technology
Over past ten years, the gas shielded arc welding that high speed development gets up becomes a kind of desirable high-efficiency welding material with solid wire, and this welding wire can be realized the high-speed and high depositedization welding of full position.
Welding wire is to be formed by the steel drawing, and Quality of Final Welding Wire depends on the quality level of steel to a great extent.Especially gas shielded arc welding welding wire, it is manufactured, and the drawing deformation amount can reach more than 90% in the process, is up to 98%, and the index that therefore surface quality, steel cleanliness factor, microstructure and the mechanical property etc. of raw material steel is affected drawing property all requires harshness.
For guaranteeing that the steel that provide satisfy manufacturing of welding wire and service requirements; domestic steel mill is producing the welding wire steel; when using the steel of welding wire in particular for manufacturing gas shielded arc welding, mostly adopt the elaboration route on the technique: molten iron → converter → LF refining → square billet full guard casting → steel billet finishing → high-speed wire rolling.In the existing maturation process widespread use LF external refining measure, the high-end kind of part has also increased RH or VD vacuum-treat process after the LF refining, the quality condition of looking in addition into the stove molten iron need carry out the desulfurization pre-treatment sometimes.There is steel mill to attempt using the secondary refining method of ladle bottom blowing argon gas to produce the welding wire steel, but in the aspects such as homogeneity of ingredients, steel cleanliness factor existing problems, causes steel quality can not satisfy service requirements.Compare with the LF method of refining, the treatment process of ladle bottom blowing argon gas is with short production cycle, production cost is low, is beneficial to the organization arrangement of production and the reduction of production cost, under the prerequisite that guarantees quality product, uses the latter more to be conducive to the raising of product competitiveness.
There is the history of two more than ten years in Capital Iron ﹠ Steel General Co with the production of steel at welding wire; accumulated deep knowhow; recently realized that application ladle bottom blowing argon gas substitutes the LF external refining at carbon welding rod steel, part welding wire for submerged-arc welding on the production of the kinds such as steel; set up mature and stable production technique, possessed the exploitation carbon steel is used steel (hereinafter to be referred as carbon steel welding wire steel) new production process with solid wire with gas shielded arc welding technical foundation.At present, the carbon steel welding wire steel that Shoudu Iron and Steel Co utilizes ladle bottom blowing argon gas purifying method to produce, the mass percent fluctuation of each element in the product can be controlled at C ± 0.02%, Si ± 0.05%, Mn ± 0.05% level, meet consumers' demand fully, the ton steel is saved about 80 yuan of cost simultaneously, has realized low-cost, all kinds of carbon steel welding wire of high efficiency production steel.
Summary of the invention
The object of the present invention is to provide a kind of carbon steel welding wire with the external refining production method of steel, can be used for the stably various types of carbon steel welding wire of suitability for industrialized production steel.
Production technique of the present invention is: use combined blown converter slightly to make steel water; Carry out deoxidation alloying in the ladle during tapping; The molten steel handling is to the Argon station, and the ladle bottom blowing argon gas is adjusted molten steel composition, and the index such as control Oxygen Content in Liquid Steel; Molten steel handling to the square billet casting machine that composition, temperature, cleanliness factor are all processed after suitable is cast.Replaced traditional LF furnace outer refining process with ladle bottom blowing argon gas refinery practice in the operational path.
The refining of ladle bottom blowing argon gas does not possess heating function, therefore, ladle bottom blowing argon gas refinery practice is compared with the LF refinery practice, there are many technology control difficult points: at first, smelting process must guarantee rational liquid steel temperature, if temperature can not be guaranteed, gently then affect slab quality, heavy then cause produce interrupting; Secondly be exactly under the prerequisite of assurance smelting process temperature, finish the control to steel quality, the function such as be about to trimming, desulfurization in the former LF refinery practice, go to be mingled with decomposes to that each operation realizes in the existing operational path.
In order to smelt the carbon steel welding wire steel of stable components with ladle bottom blowing argon gas technique, to realize reducing the target of cost, the technical parameter of the concrete control of smelting process is as follows:
1, the converter raw material is pre-desulphurised hot metal (massfraction of Sulfur Content in Hot Iron element≤0.020%) and steel scrap, and the desulfurizing iron mode is not limit, such as KR desulfurization, the desulfurization of hot metal ladle spray magnesium etc.; After molten iron enters stove, add steel scrap in molten iron and waste steel quality ratio 10:1 again.Converter requires to possess to blow again function, 1700～1750 ℃ of converter terminal tapping temperature controls, the mass percent of each element in molten steel during terminal point: carbon≤0.04%, phosphorus≤0.017%, sulphur≤0.018%, terminal point oxygen activity≤0.12%.
2, use slag-blocking ball or slag stop cone to realize the pushing off the slag tapping of converter, the thick control≤60mm of lower slag slag, tapping process adds synthetic slag 2-3Kg/ ton steel to molten steel, control basicity of slag R(R=CaOwt%/SiO
2Wt%) scope 3.2-3.6.Described synthetic slag, the mass percent of its main ingredient are CaO%=55-75%, SiO
2%=5-12%, MgO%=5-15%, surplus is impurity.
3, deoxidation is carried out simultaneously at tapping process, adopts aluminium, silicon, manganese complex deoxidization mode, and add and contain the strong deoxidation of aluminium deoxidizer early stage, and available ferro-aluminum, aluminium ferromanganese or silicon-aluminium-barium alloy also can be with above-mentioned alloy compound uses, and add-on is amounted to fine aluminium 1.8Kg/ ton steel; Tapping adds low-carbon (LC) silicomanganese and low-carbon ferrosilicon mid-term, and the add-on target is respectively ton steel 5-9Kg and a 3-6Kg.Described low-carbon (LC) silicomanganese, its Mn%=60-70%, Si%=20-30%, C≤1%, surplus is Fe etc.; Described low-carbon ferrosilicon, its Si%=75-80%, C≤0.03%, surplus is Fe and impurity.
4, the production process molten steel all uses clean red packet with ladle, and described clean red packet refers to have enough to meet the need online the ladle that temperature online turnover temperature is not less than 900 ℃, possesses good argon bottom-blowing condition.
5, molten steel is to the Argon workstation, and the top of the slag adds ferrosilicon powder and realizes the indirect deoxidation of the top of the slag.Pre-Argon 3-5 minute subsequently, again thermometric and inspection by sampling composition, if liquid steel temperature 〉=1620 ℃, normal processing then, otherwise handling is to the LF hyperthermic treatment; According to the result of inspection by sampling composition, use low-carbon ferrosilicon, mid-carbon fe-mn and carbon line to adjust successively silicon, manganese and the carbon content of molten steel to each steel grade specification of quality scope of steel grade (seeing standard-required for details, such as GB/T 3429, GB/T 8110 etc.).
6, composition adjust complete after, from the ladle bottom blowing argon gas, the time kept 8-15 minute with the flow of 50L/min, and liquid steel temperature is not less than 1580 ℃ when requiring bottom blowing to finish.
7, the argon bottom-blowing treating processes is not used the silico-calcium cored-wire, casting machine on the handling molten steel after processing finishes.
8, strictly control each operation production cycle, steel-making cycle 40-50min, argon bottom-blowing refining cycle 35-40min guarantees that molten steel can go up casting machine on time, the direct motion of assurance continuous casting working procedure.
Be proven technical scheme provided by the invention and can produce the carbon steel welding wire steel that quality meets the demands, the indexs such as its steel cleanliness factor all with traditional technology under Product Level suitable, main chemical compositions all can satisfy the relevant criterion requirement, and stable content, such as the massfraction fluctuation range of C element ± 0.02%, the massfraction fluctuation range of Si, Mn element is ± and 0.05%, the massfraction of P, S element all is no more than 0.020%, and the massfraction of wire rod oxygen element is not more than 0.0040%.Compare with traditional processing technology in addition, about 80 yuan/tons of steel can fall in cost.
The various types of carbon steel welding wire of explained hereafter of the present invention steel, its advantage is:
1, the combined blown converter that uses among the present invention is conducive to the homogenizing of molten steel composition in the stove, temperature, is the temperature controlled accuracy of the whole production process condition that provides the foundation; Reaction between carbon and oxygen is also more abundant in the combined blown converter, is conducive to control the peroxidation of endpoint molten steel, provides good basis for effectively reducing the Inclusion Problem that reductor consumption and control deoxidation bring.
The consumption of the lower quantity of slag of control and increase synthetic slag is conducive to the control of molten steel phosphorus, sulphur content when 2, tapping.
3, aluminium, silicon, manganese complex deoxidization mode are adopted in the deoxidation of converter molten steel, have both guaranteed the rational recovery rate of alloy, have also reduced the Al that aluminium deoxidation brings
2O
3Non-metallic inclusion is conducive to the control of steel cleanliness factor, reduces because of Al
2O
3The nozzle clogging risk that causes can improve the casting steel transportation amount, is conducive to the raising of production efficiency and the reduction of production cost.
4, use silicomanganese in the alloying, allocate simultaneously silicon, the manganese content of molten steel, compare independent use ferrosilicon and ferromanganese, it is nearly 20% to reduce the alloy gross weight, and the corresponding required heat energy of melted alloy that reduced is conducive to the control of liquid steel temperature.
5, the use of clean red packet is conducive to reduce the too much reduction of production process liquid steel temperature.
6, the method for refining of ladle bottom blowing argon gas among the present invention is compared with traditional LF refinery practice, takes full advantage of the heat energy that the converter reaction between carbon and oxygen produces, and the electrically heated process of having saved LF has reduced energy consumption, has reduced production cost, has saved resource.
7, give full play to the argon bottom-blowing function of external refining process, prolong the bottom blowing time, strengthen the stirring of molten steel, be conducive to molten steel composition, equalizing temperature, also be conducive to promote the raising of Cleanliness of Molten Steel level.
Embodiment
The present invention can implement in the steel mill that possesses combined blown converter, ladle bottom blowing argon gas operation and full guard casting condition.Following table 1 to table 4 has been listed key parameter example and the Quality level of actual product of production technique when Capital Iron ﹠ Steel General Co adopts the present invention to produce the carbon steel welding wire with steel ER50-6.
Table 1 combined blown converter technology key parameter
Table 2 refinery practice key parameter
Table 3 finished product Composition Control level
Table 4 steel cleanliness factor level-non-metallic inclusion
Table 5 steel cleanliness factor horizontal gas body burden
| Heat | 0，wt％ | N，wt％ |
| 1736 | 0.0026 | 0.0055 |
| 2094 | 0.0020 | 0.0053 |
| 2669 | 0.0022 | 0.0054 |
Through the production practice checking, the method for using this patent to provide can be produced carbon steel welding wire steel smoothly, and the indexs such as chemical ingredients, steel cleanliness factor level all can satisfy service requirements.
Claims (3)
1. a carbon steel welding wire is with the external refining production method of steel, and operational path is: use combined blown converter slightly to make steel water; Carry out deoxidation alloying in the ladle during tapping; The molten steel handling is to the Argon station, and the ladle bottom blowing argon gas is adjusted molten steel composition, and the index such as control Oxygen Content in Liquid Steel; Molten steel handling to the square billet casting machine that composition, temperature, cleanliness factor are all processed after suitable is cast; Replaced traditional LF furnace outer refining process with ladle bottom blowing argon gas refinery practice in the operational path, it is characterized in that, the technical parameter of controlling in the technique is as follows:
1) the converter raw material is pre-desulphurised hot metal and steel scrap, and after molten iron entered stove, the mass ratio 10:1 that presses again the molten iron steel scrap added steel scrap; The massfraction of Sulfur Content in Hot Iron element≤0.020%;
2) converter possesses and blows again function, 1700～1750 ℃ of terminal point tapping temperature controls, and the mass percent of each principal element should satisfy in the endpoint molten steel: carbon≤0.04%, phosphorus≤0.017%, sulphur≤0.018%, terminal point oxygen activity≤0.12%;
3) tapping process adds synthetic slag 2-3Kg/ ton steel to molten steel, control basicity of slag R scope 3.2-3.6; R=CaOwt%/SiO
2Wt%;
4) adopt aluminium, silicon, manganese complex deoxidization mode at tapping process;
5) molten steel is to the Argon workstation, and the top of the slag adds ferrosilicon powder and realizes the indirect deoxidation of the top of the slag; Argon 3-5 minute subsequently, thermometric and inspection by sampling composition, when liquid steel temperature 〉=1620 ℃, normal processing then, otherwise handling is to the LF hyperthermic treatment; According to the result of inspection by sampling composition, use low-carbon ferrosilicon, mid-carbon fe-mn and carbon line to adjust successively silicon, manganese and the carbon content of molten steel to steel grade specification of quality scope;
6) composition adjust complete after, from the ladle bottom blowing argon gas, the time kept 8-15 minute with the flow of 50L/min, and liquid steel temperature is not less than 1580 ℃ when requiring bottom blowing to finish; Casting machine on the handling molten steel after processing finishes;
7) control each operation production cycle, steel-making cycle 40-50min, argon bottom-blowing refining cycle 35-40min guarantees that molten steel can go up casting machine on time, the direct motion of assurance continuous casting working procedure.
2. in accordance with the method for claim 1, it is characterized in that, described synthetic slag, the quality percentage composition of its component is CaO%=55-75%, SiO
2%=5-12%, MgO%=5-15%, surplus is impurity.
3. in accordance with the method for claim 1, it is characterized in that described complex deoxidization mode contains the strong deoxidation of aluminium deoxidizer for adding early stage, with ferro-aluminum, aluminium ferromanganese or silicon-aluminium-barium alloy, perhaps with above-mentioned alloy compound use, add-on is amounted to fine aluminium 1.8Kg/ ton steel; Tap and add low-carbon (LC) silicomanganese and low-carbon ferrosilicon mid-term.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103642979A (en) * | 2013-12-13 | 2014-03-19 | 唐山国丰钢铁有限公司 | Using method of silicon-aluminum alloy |
| CN105177399A (en) * | 2015-10-16 | 2015-12-23 | 首钢总公司 | Low-cost manufacturing method for non-quenched and tempered steel for car |
| CN108570532A (en) * | 2018-05-11 | 2018-09-25 | 南京钢铁股份有限公司 | A method of improving directly upper steel grade quality and stopper rod flow control time |
| CN108707721A (en) * | 2018-04-25 | 2018-10-26 | 芜湖新兴铸管有限责任公司 | A kind of deoxidation in steel making technique and its application |
| CN108893576A (en) * | 2018-07-23 | 2018-11-27 | 攀钢集团攀枝花钢铁研究院有限公司 | The smelting process of welding rod steel H08A |
| CN110343807A (en) * | 2018-04-02 | 2019-10-18 | 潍坊特钢集团有限公司 | A kind of ER50-6E series low-carbon steel smelting deoxidization technique |
| CN112795846A (en) * | 2020-12-31 | 2021-05-14 | 中天钢铁集团有限公司 | Production method of high-performance low-silicon cold heading steel |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103642979A (en) * | 2013-12-13 | 2014-03-19 | 唐山国丰钢铁有限公司 | Using method of silicon-aluminum alloy |
| CN105177399A (en) * | 2015-10-16 | 2015-12-23 | 首钢总公司 | Low-cost manufacturing method for non-quenched and tempered steel for car |
| CN110343807A (en) * | 2018-04-02 | 2019-10-18 | 潍坊特钢集团有限公司 | A kind of ER50-6E series low-carbon steel smelting deoxidization technique |
| CN108707721A (en) * | 2018-04-25 | 2018-10-26 | 芜湖新兴铸管有限责任公司 | A kind of deoxidation in steel making technique and its application |
| CN108570532A (en) * | 2018-05-11 | 2018-09-25 | 南京钢铁股份有限公司 | A method of improving directly upper steel grade quality and stopper rod flow control time |
| CN108893576A (en) * | 2018-07-23 | 2018-11-27 | 攀钢集团攀枝花钢铁研究院有限公司 | The smelting process of welding rod steel H08A |
| CN112795846A (en) * | 2020-12-31 | 2021-05-14 | 中天钢铁集团有限公司 | Production method of high-performance low-silicon cold heading steel |
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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee before: Capital Iron & Steel General Company |