CN102660663B - Method for smelting super third-generation double-phase stainless steel by using intermediate frequency furnace - Google Patents
Method for smelting super third-generation double-phase stainless steel by using intermediate frequency furnace Download PDFInfo
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- CN102660663B CN102660663B CN2012101703170A CN201210170317A CN102660663B CN 102660663 B CN102660663 B CN 102660663B CN 2012101703170 A CN2012101703170 A CN 2012101703170A CN 201210170317 A CN201210170317 A CN 201210170317A CN 102660663 B CN102660663 B CN 102660663B
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Abstract
The invention belongs to smelting technologies for metal materials, in particular provides a method for smelting super third-generation double-phase stainless steel by using an intermediate frequency furnace in order to solve the problem that a method for smelting third-generation stainless steel by using an AOD (Argon Oxygen Decarburization) furnace is high in operating cost. A common intermediate frequency furnace is used, and the method comprises the following steps of: mixing 50 percent of sintered magnalium spinel sand MAS-50 and 50 percent of electric smelting magnalium spinel sand, compounding a furnace liner of a basic refractory; arranging diffuse type air bricks of a neutral refractory at the bottom of the furnace, blowing argon at the molten steel temperature of between 1,560 and 1,580 DEG C for 10 to 20 minutes, detecting the components in front of the furnace, increasing nitrogen and adjusting the nitrogen content by using nitrogenized ferrochrome with the content of 3 to 5 percent, and collecting molten steel which is molten to be qualified by using basic spontaneous heating packed steel ladles after the molten steel is discharged. The technical operating conditions are strictly mastered, so that the third-generation double-phase stainless steel product is smelted in the common intermediate frequency electric furnace; and therefore, extremely high economic benefits are obtained, and the method makes an advanced contribution to the casting industry.
Description
Technical field: the smelting technology class that the invention belongs to metallic substance.It is specifically related to a kind of method of using the super third generation duplex stainless steel of common equipment melting.
Background technology: along with the industrial expansion of recording modern times, various new technologies, novel process, novel material continue to bring out.Stainless steel is exactly a kind of Novel advanced alloy material of typically just at development.Common duplex stainless steel refers to that its metallographic structure is ferrite solid solution phase and two phase composites of austenite solid solution phase, these two mutually in, less phase, its content should be lower than 40% yet.By correct control Chemical Composition and thermal treatment process, high strength and anti-chloride stress cracking corrosive nature that the excellent in toughness that austenitic stainless steel is had and welding characteristic and iron plain sheet stainless steel have combine, and make duplex stainless steel that better stainless, anti-corrosion and mechanical property be arranged.Moreover, it also has the good overall characteristics such as thermal conductivity is large, linear expansivity is little.The development technically of common duplex stainless steel is divided into three phases substantially: first-generation duplex stainless steel be last century the forties by the U.S., developed.But due to its carbon content higher (≤0.1%C), during its welding, can lose and balance each other, along the grain boundary carbide precipitate, above-mentioned duplex stainless steel over-all properties be descended; S-generation stainless steel is further to study through moral, English, method, Sweden and USSR (Union of Soviet Socialist Republics), make the composition of duplex stainless steel increase again nitrogen under Ultra-low carbon (≤0.03C%) condition and just can alleviate the difference of element concentration distribution in two-phase such as chromium, nickel, thereby significantly further improve its solidity to corrosion; Third generation duplex stainless steel be last century the eighties start the development so far, it is on the basis of s-generation duplex stainless steel, improve its molybdenum content reach 4% and nitrogen content be up to 0.3%, and according to different needs, develop the multiple duplex stainless steel trade mark, the so-called super-duplex stainless steel of the better a plurality of kinds of corrosion that make that it forms anticorrosion stress-resistant, anti-pitting, slit and corrosion resistant, the antifatigue burn into is wear-resistant.At present, this super-duplex stainless steel is applied very extensively, and can be produced the Various Complex special-shaped casts at oil refining, petrochemical industry, papermaking, chemical fertilizer, light industry, food, the industrial circles such as the energy, particularly sulphur removal equipment manufacture of environmental protection in nearly ten years.Because technical difficulty is high, only have in the world a handful of countries can produce the foundry goods of this kind of material.The AOD stove (ArgonOxyenDecarbari-Lation) of U.S. Qiao Silin steel Developed the first in the world platform 15t.What its used is argon-oxygen-decarburization process, and this method is the oxygen be blown into by argon diluent from the furnace sidewall air port, and the oxygen that this kind of measure can be guaranteed to be blown in stove all participates in reaction.Gas, to be blown into the depths, molten bath at a high speed, can make molten steel and slag fully mix, and has increased the speed of response in the bath, thereby in the short period of time, just can make the successfully decarburization of high chromium steel liquid extremely low, and metal is unlikely undue oxidation.The enterprise that produces at home at present stainless cast steel part does not generally all have the AOD stove, expensive because of it, and the AOD stove of purchasing the 2t productivity of an import just needs 2,000 ten thousand left and right Renminbi.After this, reaching domestic minority factory abroad uses again arc furnace-AOD stove duplex or middle frequency furnace (or arc furnace)-VOD stove to produce this steel grade.Only using common middle frequency furnace and general technology is to produce the foundry goods that this type of alloy meets customer requirements, current, and the enterprise of Tianjin is exactly blank to the medium-and-large-sized castings production of this type of alloy.East, Tianjin auspicious steel casting company limited was since 2007, accept this super corrosive-resisting double-phase stainless steel material large power plant sulphur removal pump valve body of purchaser Germany Yi Bailuo (Beijing) company and the order of butterfly plate cast product, the heavy 200-1200 kilogram of this product, the about φ 350-of size φ 2000 millimeter, belong to high strength, super corrosion-resistant and high-abrasive material, its technical requirements is extremely strict, disapproves defects such as crackle, pore, shrinkage cavity and porosity, sand hole occur.For in face of just calling a kind of appearance of new processing method in technical qualification Ke carves, technology difficulty is high reality and economic condition inadequate situation.
Summary of the invention: the objective of the invention is to use for solving special this programme that proposes of problem that AOD stove smelting stainless steel product cost is too high---use the method for the super third generation duplex stainless steel of intermediate frequency furnace melting.It can use common equipment to add that special technical measures make the third generation duplex stainless steel product parts that high quality requires, and it has the advantages that economical effectiveness is outstanding.
Method by as above conceiving the super third generation duplex stainless steel of use intermediate frequency furnace melting proposed by the invention is characterized in that adopting following technical measures:
1. adopted sintering magnesium-aluminium spinel sand MAS-50 and electric melting magnesium aluminum spinel sand each 50%, batch mixing is made the furnace lining of compound basic refractory, size is 0～30mm, wherein<1.0mm person must not surpass 5%;
2. install argon-blowing device additional through its furnace bottom, the dispersive air brick of quickly assembled and disassembled amphoteric refractory is installed in the time of at the bottom of building by laying intermediate frequency furnace, make Argon bubble dispersiveness high.
3. use the fast thermocouple thermometric during melting, when molten steel temperature reaches 1560～1580 ℃, from the argon-blowing device spray argon of furnace bottom, bleed pressure is p=0.01～0.02MPA, makes whiff pressure can blow molten steel in the stove, liquid level has slightly and stirs, and argon blowing time is 10-20 minute;
4. used 316L foundry returns or super third generation duplex stainless steel foundry returns for main total accounts for 40-60 % left and right, added and join pure iron and other furnace charges 60-40 % left and right;
5. after fusing blowing argon gas refining melting, take out molten steel with sampler and do its composition of spectroscopic analysis, reaching the required value nitrogen content by nitrogen content in 3～5% nitrided ferro-chromium nitrogen pick-up is 0.12～0.22%, with stokehold spectrophotometer to qualified composition, taps;
6. use the alkaline spontaneous heating cylinder-packing ladle of the bottom filling can guarantee the pure property of molten steel to accept the molten steel of fusing.
Adopt this programme can embody following superiority: 1. the characteristic of this programme is to have replaced the high AOD stove of price with common intermediate frequency furnace, has overcome Ke's lithography difficulty and strict processing condition, makes and greatly reduces cost, and high economical effectiveness is arranged; 2. this programme has adopted the furnace bottom ar blowing refining, and the dispersive air brick that it has adopted amphoteric refractory to make can be realized the measure of furnace bottom Argon; 3. grasp molten steel Argon in the time of 1560～1580 ℃ when melting, pressure, at p=0.01～0.02MPA, blows 10～20 minutes, makes the molten steel face occur slightly stirring and getting final product; 4. the composition of furnace charge also will strictly be controlled, and take 316L foundry returns or super third generation duplex stainless steel foundry returns as main, adds up to and accounts for the 40%-60 left and right, adds and joins pure iron and other furnace charges 60%-40 left and right, and other furnace charge all should be done the oil removing abatement processes; 5. must transmit molten steel with the alkaline spontaneous heating cylinder-packing ladle of bottom filling, guarantee the pure of molten steel; 6. just can produce high-grade products on simple device owing to being strict with processing condition, form considerable economic benefit.
Embodiment: the present invention can produce and melt out senior alloy material under simple condition for solving, it has used common middle frequency furnace, add crucial technical measures, these technical measures comprise furnace lining adopt sintering magnesium-aluminium spinel sand MAS-50 and electric melting magnesium aluminum spinel sand each 50%, batch mixing is made the furnace lining of compound basic refractory, the granularity group is 0～30mm, and wherein<1.0mm person must not surpass 5%.Furnace bottom installs argon-blowing device additional, and the dispersive air brick of amphoteric refractory for Argon, make Argon bubble dispersiveness high.During melting when molten steel temperature reaches 1560～1580 ℃ from the argon-blowing device of furnace bottom spray argon, manual argon gas supply gas pressure is p=0.01～0.02MPA, makes whiff pressure can blow molten steel in the stove, liquid level has slightly and stirs, argon blowing time is 10-20 minute.Having used 316L foundry returns or super third generation duplex stainless steel foundry returns is the master, adds up to and accounts for 40-60 % left and right, adds and joins pure iron and other furnace charges 60-40 % left and right; After the fusing Argon, do stokehold spectroscopic analysis composition, with content, in the nitrogen pick-up of 3-5% nitrided ferro-chromium, reach required value.Molten steel must be accepted with the alkaline spontaneous heating lined steel bag of bottom filling the molten steel of fusing after coming out of the stove, to guarantee the pure of molten steel.
To found batching that the German trade mark 1.4469 smelting furnaces pack into for example: chromium metal 15%, pure iron 24.5,316L foundry returns 48%, nickel plate 2.2%, 75 ferrosilicon 0.3%, molybdenum-iron 5%, electrolysis copper coin 1.2%.Add again the nitrided ferro-chromium 2.8% containing 5% nitrogen.China there is no the standard of third generation duplex stainless steel at present, can only draw close to German product standard the German trade mark 1.4469, above-mentioned batching, it obtains the molten steel chemical composition is C≤0.03%, Si≤1.0%, Mn≤1.0%, P≤0.035%, S≤0.025%, Ni6-8%, Cr25-27%, Mo3-5%, N0.12-0.22%, Cu1.2-1.3%.
Through for a long time, experiment repeatedly, add strict process regulation, melt out senior third generation two-phase stainless steel on common intermediate frequency furnace, shown aborning obvious economic benefit, for the casting circle make huge contribution.
Claims (1)
1. a method of using the super third generation duplex stainless steel of intermediate frequency furnace melting, it uses middle frequency furnace, it is characterized in that adopting following technical measures:
1. adopted sintering magnesium-aluminium spinel sand MAS-50 and electric melting magnesium aluminum spinel sand each 50%, batch mixing is made the furnace lining of compound basic refractory, size is 0～30mm, wherein<1.0mm person must not surpass 5%;
2. install argon-blowing device additional through its furnace bottom, the dispersive air brick of quickly assembled and disassembled amphoteric refractory is installed in the time of at the bottom of building by laying intermediate frequency furnace, make Argon bubble dispersiveness high;
3. use the fast thermocouple thermometric during melting, when molten steel temperature reaches 1560～1580 ℃, from the argon-blowing device spray argon gas of furnace bottom, bleed pressure is P=0.01～0.02MPa, makes whiff pressure can blow molten steel in the stove, liquid level has slightly and stirs, and argon blowing time is 10-20 minute;
4. having used 316L foundry returns or super third generation duplex stainless steel foundry returns is the master, adds up to and accounts for 40-60%, adds and joins pure iron and other furnace charges 60-40%;
5. through fusing with by after the refining of molten steel blowing argon gas, take out molten steel with sampler and do its composition of spectroscopic analysis, according to the composition recorded, calculate the nitrided ferro-chromium aequum by nitrogen content 3～5%, making molten steel nitrogen pick-up reach requirement nitrogen content value is 0.12～0.22%, with stokehold spectrophotometer to qualified composition, taps;
6. use the ladle of the alkaline spontaneous heating cylinder-packing of the bottom filling can guarantee the pure property of molten steel to accept the molten steel of fusing.
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| CN104250673B (en) * | 2013-06-25 | 2016-06-29 | 江苏万恒铸业有限公司 | A kind of smelting technology reducing nuclear grade stainless steel foundry goods ferrite content |
| CN103397142B (en) * | 2013-08-13 | 2015-03-25 | 北票电力铸钢有限公司 | AOD (argon oxygen decarburization) refining and smelting process for preparing super duplex stainless steel pump valve |
| CN103525974B (en) * | 2013-09-27 | 2015-05-06 | 中核苏阀横店机械有限公司 | Smelting method for producing duplex stainless steel casting CD3MN with intermediate frequency furnace |
| CN103966385A (en) * | 2014-05-14 | 2014-08-06 | 中原特钢股份有限公司 | Process for smelting MC5 roller by using return scraps |
| CN109503213A (en) * | 2018-08-29 | 2019-03-22 | 泰州市海创新能源研究院有限公司 | A method of strengthening high temperature furnace furnace wall fire resistance |
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| CN1187467C (en) * | 2002-11-08 | 2005-02-02 | 陈才金 | Two-phase stainless steel |
| CN101429629A (en) * | 2007-11-10 | 2009-05-13 | 顾贤良 | Biphase stainless steel |
| CN101638753B (en) * | 2009-08-26 | 2011-02-02 | 福州大学 | Manufacture method of solution treatment-free high-performance two-phase stainless cast steel |
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Address after: 300300 Tianjin city Dongli District Lixin Street thirteen hectares of village Patentee after: TIANJIN DONGRUI STEEL CASTING CO.,LTD. Address before: 300300 Tianjin District of Dongli city for thirteen years Patentee before: TIANJIN DONGRUI FOUNDRY Co.,Ltd. |
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