CN102851447B - 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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Abstract
The invention relates to an outside-furnace refining production method of steel used in carbon steel welding wire and using argon for protecting arc welding. 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, particularly provide a kind of carbon steel with gas shielded arc welding, to use the external refining production method of steel with solid wire, be applied to the production of various types of carbon steel welding wire with 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 drawing deformation amount in process and can reach more than 90%, 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 to drawing property all requires harshness.
For guaranteeing that the steel that provide meet manufacturing of welding wire and service requirements; domestic steel mill is producing the welding wire steel; while in particular for manufacturing gas shielded arc welding, using the steel of welding wire, on technique, mostly adopt the elaboration route: molten iron → converter → LF refining → square billet full guard casting → steel billet finishing → high-speed wire rolling.In 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 needs to 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, cause steel quality can not meet service requirements.With the LF method of refining, compare, 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 in the production of welding wire with steel; accumulated deep knowhow; recently at carbon welding rod steel, part welding wire for submerged-arc welding with in the production of the kinds such as steel, having realized that application ladle bottom blowing argon gas substitutes the LF external refining; set up mature and stable production technique, possessed the exploitation carbon steel and with gas shielded arc welding, use the technical foundation of steel (hereinafter to be referred as carbon steel welding wire steel) new production process with solid wire.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 fluctuation of the mass percent of each element in product can be controlled to C ± 0.02%, Si ± 0.05%, Mn ± 0.05% level, meet consumers' demand fully, the ton steel is cost-saving approximately 80 yuan 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 with gas shielded arc welding, to use the external refining production method of steel with solid wire, 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; During tapping, carry out deoxidation alloying in ladle; The molten steel handling is to the Argon station, and the ladle bottom blowing argon gas is adjusted molten steel composition, and controls the index such as 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.In operational path, replaced traditional LF furnace outer refining process with ladle bottom blowing argon gas refinery practice.
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, exist many technology to control difficult point: at first, smelting process must guarantee rational liquid steel temperature, if temperature can not be guaranteed, gently affect slab quality, heavy cause produce interrupting; Secondly be exactly under the prerequisite of assurance smelting process temperature, complete the control to steel quality, the function such as be about to trimming, desulfurization in former LF refinery practice, go to be mingled with, decompose to each operation in existing operational path and realize.
In order by ladle bottom blowing argon gas technique, to smelt the carbon steel welding wire steel of stable components, to realize the target reduced costs, the concrete technical parameter of controlling 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, as KR desulfurization, the desulfurization of hot metal ladle spray magnesium etc.; After molten iron enters stove, then add steel scrap in molten iron and waste steel quality ratio 10:1.Converter requires to possess to blow again function, and the converter terminal tapping temperature is controlled 1700～1750 ℃, the mass percent of each element in molten steel during terminal: carbon≤0.04%, phosphorus≤0.017%, sulphur≤0.018%, terminal 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, controls 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 by above-mentioned alloy compound use, and add-on is amounted to fine aluminium 1.8Kg/ ton steel; Tapping adds low-carbon (LC) silicomanganese and low-carbon ferrosilicon, add-on target to be respectively ton steel 5-9Kg and a 3-6Kg mid-term.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 is all used clean red packet with ladle, and described clean red packet refers to that online turnover temperature online has enough to meet the need the ladle that 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, then thermometric inspection by sampling composition, if liquid steel temperature >=1620 ℃, normal processing, 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 (referring to standard-required, as GB/T3429, GB/T8110 etc.) of steel grade.
6, after composition is adjusted, from the ladle bottom blowing argon gas, the time keeps 8-15 minute with the flow of 50L/min, and liquid steel temperature is not less than 1580 ℃ while 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, guarantee 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 meet the relevant criterion requirement, and stable content, 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%.With traditional processing technology, compare in addition, approximately 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 used in the present invention is conducive to the homogenizing of molten steel composition in 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 combined blown converter, is conducive to control the peroxidation of endpoint molten steel, provides good basis for effectively reducing the reductor consumption and controlling the Inclusion Problem that deoxidation brings.
The consumption of controlling the lower quantity of slag while 2, tapping and increasing synthetic slag, be conducive to the control of molten steel phosphorus, sulphur content.
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, be conducive to the control of steel cleanliness factor, reduces because of Al
2O
3The nozzle clogging risk caused, can improve the casting steel transportation amount, is conducive to the raising of production efficiency and the reduction of production cost.
4, in alloying, use silicomanganese, allocate simultaneously silicon, the manganese content of molten steel, compare independent use ferrosilicon and ferromanganese, can reduce the alloy gross weight nearly 20%, the corresponding required heat energy of melted alloy that reduced, be 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 in the present invention, compare 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, reduced energy consumption, reduced production cost, saved resource.
7, give full play to the argon bottom-blowing function of external refining process, extend 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 one non-metallic inclusion
Table 5 steel cleanliness factor level-gas content
| 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 composition, steel cleanliness factor level all can meet service requirements.
Claims (2)
1. by the external refining production method of solid wire with steel, operational path is with gas shielded arc welding for a carbon steel: use combined blown converter slightly to make steel water; During tapping, carry out deoxidation alloying in ladle; The molten steel handling is to the Argon station, and the ladle bottom blowing argon gas, adjust molten steel composition, and controls the Oxygen Content in Liquid Steel index; Molten steel handling to the square billet casting machine that composition, temperature, cleanliness factor are all processed after suitable is cast; In operational path, replaced traditional LF furnace outer refining process with ladle bottom blowing argon gas refinery practice, it is characterized in that, the technical parameter of controlling in technique is as follows:
1) the converter raw material is pre-desulphurised hot metal and steel scrap, after molten iron enters stove, then adds steel scrap by the mass ratio 10:1 of molten iron steel scrap; The massfraction of Sulfur Content in Hot Iron element≤0.020%;
2) converter possesses and blows again function, and the terminal tapping temperature is controlled 1700～1750 ℃, and in endpoint molten steel, the mass percent of each principal element should meet: carbon≤0.04%, phosphorus≤0.017%, sulphur≤0.018%, terminal oxygen activity≤0.12%;
3) tapping process adds synthetic slag 2-3Kg/ ton steel to molten steel, controls basicity of slag R scope 3.2-3.6; R=CaOwt%/SiO
2Wt%;
4) at tapping process, adopt aluminium, silicon, manganese complex deoxidization mode;
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 inspection by sampling composition, when liquid steel temperature >=1620 ℃, normal processing, 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) after composition is adjusted, from the ladle bottom blowing argon gas, the time keeps 8-15 minute with the flow of 50L/min, and liquid steel temperature is not less than 1580 ℃ while 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, guarantee that molten steel can go up casting machine on time, the direct motion of assurance continuous casting working procedure;
Described synthetic slag, the quality percentage composition of its component is CaO%=55-75%, SiO
2%=5-12%, MgO%=5-15%, surplus is impurity.
2. 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, and with ferro-aluminum, aluminium ferromanganese or silicon-aluminium-barium alloy, or by 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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| CN103642979A (en) * | 2013-12-13 | 2014-03-19 | 唐山国丰钢铁有限公司 | Using method of silicon-aluminum alloy |
| CN105177399B (en) * | 2015-10-16 | 2017-11-17 | 首钢总公司 | A kind of low-cost manufacture method of automobile using non-hardened and tempered steel |
| 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 |
| CN108570532B (en) * | 2018-05-11 | 2020-07-14 | 南京钢铁股份有限公司 | Method for improving quality of directly-fed steel grade and flow control time of stopper rod |
| CN108893576B (en) * | 2018-07-23 | 2020-09-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Smelting method 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 |