CN101705362A - Electroslag remelting quaternary slag system for preparing high-purity stainless steel - Google Patents
Electroslag remelting quaternary slag system for preparing high-purity stainless steel Download PDFInfo
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- CN101705362A CN101705362A CN200910216381A CN200910216381A CN101705362A CN 101705362 A CN101705362 A CN 101705362A CN 200910216381 A CN200910216381 A CN 200910216381A CN 200910216381 A CN200910216381 A CN 200910216381A CN 101705362 A CN101705362 A CN 101705362A
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Abstract
The invention discloses an electroslag remelting quaternary slag system for preparing high-purity stainless steel. The electroslag remelting quaternary slag system is characterized by comprising the following compositions in percentage by weight: 50 to 65 percent of CaF2, 20 to 25 percent of Al2O3, 10 to 25 percent of CaO and 0 to 5 percent of MgO. The quaternary slag system is adopted for electroslag remelting, can effectively reduce the non-metallic inclusion content of the steel and improves the purity of the steel under the condition of non-protective atmosphere and has the characteristics of little investment, low use cost and easy realization.
Description
Technical field
The present invention relates to the electroslag slag system that uses in the metal esr, relate to the electroslag remelting quaternary slag system that is used to prepare high-purity stainless steel.Mainly be applicable to the 12%Cr series stainless steel of esr high purity requirement etc., to satisfy the requirement of super (surpassing) critical unit, nuclear material and part military project with the technical indicators such as non-metallic inclusion of steel to steel material.
Background technology
High speed development along with power industry, internal vapor turbine unit significantly increases with steel and unit capacity, more and more higher to the steam turbine unit with every over-all properties requirement of steel, domestic steam turbine plant is from external a large amount of many super (surpassing) critical steam turbine unit steel of introducing, its check is fully according to foreign standard and corresponding company standard, as 1Cr10NiMoW2VNbN steel, the MTB10AA steel of introducing from Mitsubishi heavy industry company; Make steel such as blade from turbine and compressor that Siemens Company introduces with X5CrNiCuNb16-4, X5CrMoAl12 forging, and from KT5312AS6, KT5931ASO, the steel grades such as KT5905ASO, KT5331ASO of HIT's introduction.
In recent years, for alleviating the pressure that energy field faced, accelerating development super (surpassing) critical unit and nuclear material became the inevitable choice that solves China's supply of electric power problem.When greatly developing nuclear power generation, nuclear power and super (surpassing) critical unit are the inexorable trends of China's steam turbine industry development with the production domesticization of steel.But compare with the GB/T8732-2004 " turbine blade steel " of present municipal execution, super (surpassing) critical unit, nuclear material and part military project are more strict with the technical requirements such as non-metallic inclusion of steel to steel material.
Esr is the effective means that reduces nonmetallic inclusionsin steel content.In esr process, the electroslag slag system is an important factor that influences the steel ingot internal soundness, and esr can improve clarity, it has been generally acknowledged that to depend on to a great extent and slag system ingredient, and is secondly relevant with the clarity of electrode masterbatch.The chemical ingredients of different slag systems has determined specific conductivity, fusing point, viscosity and the surface tension of slag system, the viscosity of bits not only influences the surface quality of steel ingot, also influenced the surface tension and the interfacial tension of bits, the surface tension of bits and molten steel interfacial surface tension finally influence the adsorptive power of non-metallic inclusion.The electroslag slag system of available technology adopting is difficult to satisfy the requirement with the technical indicators such as non-metallic inclusion of steel to steel material of super (surpassing) critical unit, nuclear material and part military project.For example: military project is with this shellfish series material 1Cr12Ni3MoVN steel, and the clarity check rate that once is up to the standards is about 44% only, has a strong impact on the inner quality of these series war products.
Summary of the invention
Purpose of the present invention is intended to overcome deficiency of the prior art, and a kind of electroslag remelting quaternary slag system that is used to prepare high-purity stainless steel that can effectively reduce nonmetallic inclusionsin steel content, improve the clarity of steel is provided.
Content of the present invention is: a kind of electroslag remelting quaternary slag system that is used to prepare high-purity stainless steel is characterized in that: the composition of described quaternary slag system and weight percent are CaF
2(Calcium Fluoride (Fluorspan)) 50～65%, Al
2O
3(aluminium sesquioxide) 20～25%, CaO (calcium oxide) 10～25%, MgO (magnesium oxide) 0～5%.
In the content of the present invention: the composition of described quaternary slag system and weight percent are CaF preferably
250%, Al
2O
325%, CaO 20%, MgO 5%.
Adopt the present invention to prepare high purity 12%Cr stainless steel electroslag remelting steel ingot, generally can be through following steps:
The first step, preparation metal electrode: adopt " electric arc furnace+external refining " smelting mode to produce the required metal electrode of esr;
Second step, the preparation of slag charge and refinement and fusion casting: adopt the described quaternary slag system of content of the present invention esr;
The preparation of described slag charge can be: by described each component of quaternary slag system of getting of content of the present invention, it is formed and weight percent is CaF
2(Calcium Fluoride (Fluorspan)) 50～65%, Al
2O
3(aluminium sesquioxide) 20～25%, CaO (calcium oxide) 10～25%, MgO (magnesium oxide) 0～5%, toast under 750～800 ℃ temperature the mixing back, storing time 5～7 hours (being 6 hours preferably).
The 3rd step, mould internal cooling and take off ingot.
Compared with prior art, the present invention has following characteristics:
(1) the present invention is by improving the basicity of bits (being the quaternary slag system), increase the surface tension and the molten steel interfacial surface tension of bits, increase the wetting angle of molten steel and non-metallic inclusion, make molten steel weaken to the wetness degree of non-metallic inclusion, between the two interfacial tension increases, help tiny non-metallic inclusion in the steel gathering, grow up and get rid of; Simultaneously, by suitable increase CaO content, reduce CaF
2Content also can increase the viscosity of bits, weakens the ventilation property of bits, slows down the transmission speed of oxygen in slag in the atmosphere, thereby reaches the purpose of the clarity that improves steel;
(2) adopt the present invention to carry out esr, can under the unprotect atmospheric condition, effectively reduce nonmetallic inclusionsin steel content, improve the clarity of steel, have that investment is little, use cost is low, the characteristics of easy realization, and is practical.
Embodiment
Below by embodiment the present invention is further described:
Embodiment 1:
Adopt quaternary slag system of the present invention to prepare high purity 12%Cr stainless steel electroslag remelting steel ingot, comprise the following steps:
The first step, preparation metal electrode:
The source of metal electrode is the key that can electroslag furnace be produced.Present embodiment adopts " electric arc furnace+external refining " to smelt and obtains the metal electrode of the used all size of esr, 1.1 tons～1.3 tons/of electrode specifications with bottom casting;
The chemical ingredients of a, consumable electrode and weight percent are formed should satisfy following requirement:
C 0.08～0.15%, Mn 0.50～0.90%, Si≤0.25%, S≤0.015%, P≤0.020%, Ni 2.00～3.00%, Cr 11.00～12.50%, Mo 1.50～2.00%, V 0.25～0.40%, N0.020～0.040%, surplus are Fe; Residual element require: Ti≤0.020%, Al≤0.020%, Cu≤0.10%, Sn≤0.015%, Sb≤0.002%, As≤0.020%;
B, be made into per two of the consumable electrode of Dan Zhichang 2500 ± 10mm a pair of;
Second step, preparation slag charge and refinement and fusion casting:
A, electroslag slag system adopt CaF
250%, Al
2O
325%, the weight percent of CaO 20%, MgO 5% is got each component, is mixed into slag charge, slag charge amount 110～120Kg;
B, slag charge baking: should be strict when the preparation of slag charge and baking by the working specification accurate operation; With slag charge through 750～800 ℃ toast, storing time 6 hours (also can be 5～7 hours);
C, refinement and fusion casting: adopt single-phase single support arm electroslag remelting furnace to carry out remelting, adopt copper wall water mold and water cooled bottom plate;
D, reductor: adopt the Si-Ca powder to carry out deoxidation, by the even Si-Ca powder of every electrode of automatic conveying device 200～500g;
E, slag making and change slag: the slag charge that the part proportioning is good is put into crystallizer bottom, with the Graphite Electrodes striking of switching on, gradually slag charge is all added in the crystallizer, until the slag charge off-bottom;
F, remelting: treat to hang out Graphite Electrodes after the slag charge off-bottom, change the remelting of consumable metal electrode, treat to hang out when metal electrode dissolves to top 50 ± 5mm, change another metal electrode and continue remelting, when remelting is lacked 500～700Kg to the actual weight of ESR ingot than expectation weight, reduce power and carry out the feeding stage;
The 3rd step, mould internal cooling, take off ingot and thermal treatment:
After feeding finished, mould internal cooling 40～60 minutes took off ingot, took off to adopt that cover is cold slowly to be cooled off behind the ingot, and according to ingot shape, cover cool time 36～48 hours is in time annealed after the slow cooling, makes steel ingot.
Embodiment 2～6:
Adopt quaternary slag system of the present invention to prepare high purity 12%Cr stainless steel electroslag remelting steel ingot, the slag charge of described quaternary slag system is formed and weight percent sees the following form:
Other is with the record of embodiment 1 or content part of the present invention, slightly.
Adopt the method for the embodiment of the invention 1 or content part of the present invention record, super (surpassing) critical materials 1Cr12Ni3Mo2VN steel of production [steam turbine is with surpassing (surpassing) critical materials], the data that detect the non-metallic inclusion of super (surpassing) critical materials see Table 1:
Table 1: the non-metallic inclusion in super (surpassing) critical materials 1Cr12Ni3Mo2VN steel
Annotate: 1, the requirement of " qualified requirement " value is the company standard required value in the table 1, and the method for inspection is to test by standard GB/T10561-1989 " the micro-assessment method of nonmetallic inclusionsin steel ",
2, " detected value 1 " and " detected value 2 " is respectively 1 part described super (surpassing) in the table 1
The detected value of critical materials 1Cr12Ni3Mo2VN steel.
Adopt the method for the embodiment of the invention 1 or content part of the present invention record, the military project of producing is with this shellfish series material 1Cr12Ni3MoVN steel, detect its clarity and reach corresponding military standard requirement fully, and make our factory production military project with this shellfish series material 1Cr12Ni3MoVN steel, clarity once is up to the standards rate from qualification rate 45% in 2008, is increased to 96%.
In this specification sheets, step and processing method that not clear and definite per-cent is weight percent (or weight percentage), not concrete statement are equal to prior art.
The invention is not restricted to the foregoing description, content of the present invention is described all can implement and have described good result.
Claims (2)
1. electroslag remelting quaternary slag system that is used to prepare high-purity stainless steel, it is characterized in that: the composition of described quaternary slag system and weight percent are CaF
250～65%, Al
2O
320～25%, CaO10～25%, MgO 0～5%.
2. by the described electroslag remelting quaternary slag system that is used to prepare high-purity stainless steel of claim 1, it is characterized in that: the composition of described quaternary slag system and weight percent are CaF
250%, Al
2O
325%, CaO 20%, MgO 5%.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102912151A (en) * | 2012-11-23 | 2013-02-06 | 重庆材料研究院 | Ultra pure electroslag remelting method for high-performance corrosion resistant alloy |
| CN102925712A (en) * | 2012-11-23 | 2013-02-13 | 重庆材料研究院 | Electroslag remelting method for difficult-processing high alloy stainless steel and electroslag remelting slag system adopting electroslag remelting method |
| CN103290229A (en) * | 2013-05-09 | 2013-09-11 | 四川六合锻造股份有限公司 | Method for optimizing X12CrMoWVNbN10-1-1 electroslag remelting slag system |
| CN104195348A (en) * | 2014-09-18 | 2014-12-10 | 刘天成 | Low-silicon and low-impurity pre-melting slag for electro-slag remelting and preparing method and application thereof |
| CN104451397A (en) * | 2015-01-06 | 2015-03-25 | 江苏羽立新材料科技有限公司 | Precision alloy for piston ring in piston type internal combustion engine and manufacturing method of precision alloy |
| CN104561569A (en) * | 2015-01-14 | 2015-04-29 | 中原特钢股份有限公司 | Preparation and use process for electroslag remelting slag |
| CN105256100A (en) * | 2015-11-11 | 2016-01-20 | 攀钢集团成都钢钒有限公司 | Electroslag system for reducing occluded foreign substances |
| CN105296881A (en) * | 2014-07-31 | 2016-02-03 | 宝钢特钢有限公司 | Stainless heat resistant steel for turbine disc of large gas turbine and manufacturing method of forging thereof |
| CN105349732A (en) * | 2015-12-11 | 2016-02-24 | 攀钢集团成都钢钒有限公司 | Preparation method for low-oxigen low-inclusion P91 electroslag steel |
| CN105567989A (en) * | 2016-01-06 | 2016-05-11 | 攀钢集团成都钢钒有限公司 | Smelting method for clean electroslag steel |
| CN108342587A (en) * | 2018-04-10 | 2018-07-31 | 抚顺特殊钢股份有限公司 | A kind of stainless Blade Steel electroslag remelting slag |
| CN109762999A (en) * | 2018-12-27 | 2019-05-17 | 攀钢集团江油长城特殊钢有限公司 | A kind of smelting process of HR-2 steel |
| CN112831668A (en) * | 2020-12-03 | 2021-05-25 | 成都先进金属材料产业技术研究院有限公司 | G20CrNi2Electroslag remelting slag system of Mo alloy and application thereof |
| CN114635071A (en) * | 2020-12-16 | 2022-06-17 | 宝武特种冶金有限公司 | Smelting method of martensite heat-resistant steel |
-
2009
- 2009-11-26 CN CN200910216381A patent/CN101705362A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102912151A (en) * | 2012-11-23 | 2013-02-06 | 重庆材料研究院 | Ultra pure electroslag remelting method for high-performance corrosion resistant alloy |
| CN102925712A (en) * | 2012-11-23 | 2013-02-13 | 重庆材料研究院 | Electroslag remelting method for difficult-processing high alloy stainless steel and electroslag remelting slag system adopting electroslag remelting method |
| CN103290229A (en) * | 2013-05-09 | 2013-09-11 | 四川六合锻造股份有限公司 | Method for optimizing X12CrMoWVNbN10-1-1 electroslag remelting slag system |
| CN105296881A (en) * | 2014-07-31 | 2016-02-03 | 宝钢特钢有限公司 | Stainless heat resistant steel for turbine disc of large gas turbine and manufacturing method of forging thereof |
| CN104195348A (en) * | 2014-09-18 | 2014-12-10 | 刘天成 | Low-silicon and low-impurity pre-melting slag for electro-slag remelting and preparing method and application thereof |
| CN104451397A (en) * | 2015-01-06 | 2015-03-25 | 江苏羽立新材料科技有限公司 | Precision alloy for piston ring in piston type internal combustion engine and manufacturing method of precision alloy |
| CN104561569A (en) * | 2015-01-14 | 2015-04-29 | 中原特钢股份有限公司 | Preparation and use process for electroslag remelting slag |
| CN105256100A (en) * | 2015-11-11 | 2016-01-20 | 攀钢集团成都钢钒有限公司 | Electroslag system for reducing occluded foreign substances |
| CN105349732A (en) * | 2015-12-11 | 2016-02-24 | 攀钢集团成都钢钒有限公司 | Preparation method for low-oxigen low-inclusion P91 electroslag steel |
| CN105349732B (en) * | 2015-12-11 | 2017-11-10 | 攀钢集团成都钢钒有限公司 | A kind of preparation method of the low field trash P91 Electro Slag Remelting Steels of hypoxemia |
| CN105567989A (en) * | 2016-01-06 | 2016-05-11 | 攀钢集团成都钢钒有限公司 | Smelting method for clean electroslag steel |
| CN105567989B (en) * | 2016-01-06 | 2017-08-29 | 攀钢集团成都钢钒有限公司 | The smelting process of clean Electro Slag Remelting Steel |
| CN108342587A (en) * | 2018-04-10 | 2018-07-31 | 抚顺特殊钢股份有限公司 | A kind of stainless Blade Steel electroslag remelting slag |
| CN109762999A (en) * | 2018-12-27 | 2019-05-17 | 攀钢集团江油长城特殊钢有限公司 | A kind of smelting process of HR-2 steel |
| CN112831668A (en) * | 2020-12-03 | 2021-05-25 | 成都先进金属材料产业技术研究院有限公司 | G20CrNi2Electroslag remelting slag system of Mo alloy and application thereof |
| CN114635071A (en) * | 2020-12-16 | 2022-06-17 | 宝武特种冶金有限公司 | Smelting method of martensite heat-resistant steel |
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Open date: 20100512 |