WO2022127017A1 - 一种索氏体不锈钢专用连铸结晶器保护渣及其应用 - Google Patents

一种索氏体不锈钢专用连铸结晶器保护渣及其应用 Download PDF

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WO2022127017A1
WO2022127017A1 PCT/CN2021/094209 CN2021094209W WO2022127017A1 WO 2022127017 A1 WO2022127017 A1 WO 2022127017A1 CN 2021094209 W CN2021094209 W CN 2021094209W WO 2022127017 A1 WO2022127017 A1 WO 2022127017A1
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parts
stainless steel
continuous casting
powder
sorbite
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PCT/CN2021/094209
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English (en)
French (fr)
Inventor
杜振宇
李晓阳
屈党军
徐金岩
陈永彦
王岩
马晓娜
王希彬
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西峡龙成冶金材料有限公司
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Priority to KR1020227035884A priority Critical patent/KR102652159B1/ko
Publication of WO2022127017A1 publication Critical patent/WO2022127017A1/zh
Priority to ZA2022/11256A priority patent/ZA202211256B/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10Supplying or treating molten metal
    • B22D11/11Treating the molten metal
    • B22D11/111Treating the molten metal by using protecting powders
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/001Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • B22D11/002Stainless steels
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/064Dephosphorising; Desulfurising
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/076Use of slags or fluxes as treating agents

Definitions

  • the present application relates to the technical field of steelmaking auxiliary materials, in particular, to a special continuous casting mold powder for sorbite stainless steel and its application.
  • Sorbite stainless steel S600E overcomes the problem that the strength of austenitic stainless steel and ferritic stainless steel is not low; Corrosion problem of ordinary structural steel; the corrosion performance is close to that of dual-phase steel, but the cost is only 1/3; under the yield strength of 600 MPa, S600E still has an elongation of more than 20%, and the strength is comparable to the highest level of high-strength seismic steel in Japan ;
  • the corrosion resistance of S600E is 150 times that of conventional carbon steel, and the building life using this steel can be extended from the current 70 years to more than 500 years; this steel also has a yield of more than 200 MPa at 600 degrees high temperature It is a low-cost refractory steel deemed by the construction industry; it still has an impact energy of more than 40J at a low temperature of minus 40 degrees.
  • the main component of S600E is iron, with 8-16wt% of chromium and 1-5wt% of nickel as the main alloying elements, other elements containing 0.01-0.1wt% of phosphorus, less than 0.04wt% of sulfur and oxygen
  • the content is less than 30ppm.
  • the sorbite stainless steel S600E is a new type of steel, the tensile strength in terms of mechanical properties is not less than 600MPa, the non-proportional elongation strength RP0.2 is not less than 500MPa, and the elongation after fracture is not less than 14%.
  • the grain size is controlled to be above grade 8, and the comparative corrosion rate under neutral salt spray corrosion conditions is 30 to 80 times that of Q345.
  • One of the objectives of the present application includes providing a continuous casting mold powder for sorbite stainless steel to solve the above-mentioned technical problems.
  • the second purpose of the present application includes providing an application of the above-mentioned special continuous casting mold mold flux for sorbite stainless steel in continuous casting of sorbite stainless steel.
  • the present application provides a special continuous casting mold mold powder for sorbite stainless steel.
  • the chemical composition of the continuous casting mold mold mold powder for sorbite stainless steel includes 23-30% of CaO, 27- 34% SiO 2 , 6.5-9.0% Al 2 O 3 , 0.5-2% Fe 2 O 3 , 1-3% MgO, 4.5-8.0% Na 2 O, 4.0-6% F - , 0.18-1.6% of Li 2 O, 0.48-2% of B 2 O 3 , 0.35-1.6% of BaO, 2.8-5.5% of MnO, 3-6% of Ct, and the remainder being unavoidable impurities.
  • the above chemical composition includes 24.6-27.36% CaO, 28.16-33.67% SiO 2 , 6.7-8.72% Al 2 O 3 , 0.8-0.95% Fe 2 O 3 , 1.79-2.74% MgO, 4.95-7.95% Na 2 O, 4.63-5.84% F - , 0.31-1.44% Li 2 O, 0.48-1.92% B 2 O 3 , 0.38-0.81% BaO, 3-4.64% MnO and 3.65 to 5.8% of Ct, and the balance is unavoidable impurities.
  • the raw materials of continuous casting mold powder for sorbite stainless steel include glass powder, cement clinker, industrial soda ash, fluorite, pre-melting material, wollastonite, lithium carbonate, sodium fluoride, light-burned magnesia. Powder, bentonite, cryolite, bauxite, borax, barium carbonate, manganese carbonate, dispersants, carbon black and binders.
  • the raw materials include 1.5-5 parts of glass powder, 1-7 parts of cement clinker, 0.5-4.0 parts of industrial soda ash, 0.5-5.0 parts of fluorite, pre-melting material and wollastonite in a total of 45 parts ⁇ 60 parts, lithium carbonate 0.5-4.0 parts, sodium fluoride 1.0-5.0 parts, light burnt magnesia powder 0.5-2.0 parts, bentonite 2.0-4 parts, cryolite 2.0-5.0 parts, bauxite 6-10 parts, 1-4 parts of borax, 0.5-2 parts of barium carbonate, 4-7 parts of manganese carbonate, 0.5-3.0 parts of dispersant, 1.5-4.0 parts of carbon black and 0.5-3.0 parts of binder.
  • the mass ratio of pre-melt and wollastonite is 30-50:50-70.
  • the raw materials include 1.5-5 parts of glass frit, 1.5-6.6 parts of cement clinker, 0.5-3.5 parts of industrial soda ash, 0.5-4.5 parts of fluorite, and a total of 48.5 parts of pre-melting material and wollastonite. ⁇ 57 parts, lithium carbonate 0.8-3.7 parts, sodium fluoride 1.5-5.0 parts, light-burned magnesia powder 0.5-1.5 parts, bentonite 2.0-4 parts, cryolite 2.0-4.8 parts, bauxite 6-9 parts, 1-4 parts of borax, 1-2 parts of barium carbonate, 4-6.5 parts of manganese carbonate, 0.5-3.0 parts of dispersant, 1.9-3.6 parts of carbon black and 0.8-2.5 parts of binder.
  • the binder is sodium carboxymethyl cellulose.
  • the binary basicity of the mold slag for continuous casting mold for sorbite stainless steel is 0.8-0.9.
  • the binary basicity is the mass ratio of CaO/SiO 2 .
  • the melting point of the mold slag for continuous casting mold for sorbite stainless steel is 1130-1170°C.
  • the viscosity of the mold slag for continuous casting mold for sorbite stainless steel at 1300° C. is 0.4-0.6 Pa ⁇ S.
  • the binary basicity of the mold slag for continuous casting mold for sorbite stainless steel is 0.81-0.9.
  • the melting point of the mold slag for continuous casting of sorbite stainless steel is 1135-1165°C.
  • the viscosity of the mold slag for continuous casting mold for sorbite stainless steel at 1300° C. is 0.42-0.55 Pa ⁇ S.
  • the present application provides the application of the continuous casting mold powder for sorbite stainless steel according to any one of the foregoing embodiments in the continuous casting of sorbite stainless steel.
  • the sorbitic stainless steel is type S600E.
  • the influence of low shrinkage rate of sorbite stainless steel can be reduced, and the influence of cracks caused by sulfur and phosphorus elements can be alleviated. It can reduce the influence of vibration marks on rolling quality and the stability of heat conduction; prevent sorbite stainless steel from freezing steel on the molten steel surface during continuous casting, reduce the influence of slag inclusions and inclusions on the quality of casting billets, and adsorb the surface of molten steel. Inclusions, improve the purity of molten steel, lubricate the billet, and solve various problems of the surface quality of the billet such as cracks, depressions, slag inclusions, and scarring in the production process of sorbite stainless steel continuous casting.
  • the inventor found that the chromium and nickel elements contained in S600E sorbite stainless steel reduce the specific shrinkage rate of this series of steel grades and other stainless steels, resulting in a smaller gap between the cast billet and the copper plate.
  • the friction between the lower slab and the copper plate increases, resulting in a decrease in the amount of slag in the mold slag, which affects the uniformity of normal lubrication and heat transfer, affects the balance of melting and consumption of mold slag, and is prone to bond breakouts;
  • the content of phosphorus and sulfur elements is high, which is easy to cause high crack sensitivity of this series of steels.
  • the inventor creatively proposes to set the mold flux composition mainly from two aspects of increasing the amount of slag (that is, improving the lubricating effect of the slab) and increasing the weak cooling capacity, and simultaneously improving the heat preservation of the mold flux and the ability to absorb inclusions.
  • the basicity in order to increase the amount of slag, the basicity can be appropriately reduced to increase the degree of vitrification of the slag film.
  • the melting point in terms of increasing the weak cooling, the melting point can be appropriately controlled to be higher, and the heat transfer can be reduced to increase the weak cooling; at the same time, the viscosity can be appropriately increased, the thermal conductivity can be reduced, the thermal conductivity can be reduced, and the impact of vibration marks on the rolling quality can be slowed down.
  • the temperature of the molten steel surface can be increased by increasing the melting point and the thickness of the molten slag layer can be increased to prevent radiation heat dissipation. The melting and casting process proceeds antegrade.
  • the main method is to increase the content of boron oxide, lithium oxide and manganese oxide in the product, reduce the content of inclusions such as alumina, and improve the adsorption capacity of inclusions. .
  • the chemical composition of the continuous casting mold mold powder for sorbite stainless steel includes 23-30% of CaO, 27-34 % SiO 2 , 6.5-9.0% Al 2 O 3 , 0.5-2% Fe 2 O 3 , 1-3% MgO, 4.5-8.0% Na 2 O, 4.0-6% F - , 0.18 -1.6% Li 2 O, 0.48 - 2% B 2 O 3 , 0.35 - 1.6% BaO, 2.8 - 5.5% MnO, 3 - 6% Ct, and the balance is unavoidable impurities.
  • the content of CaO can be 23%, 25%, 28% or 30%, and can also be any other value within the range of 23-30%.
  • the content of SiO 2 may be 27%, 30%, 32%, or 34%, etc., or may be any other value within the range of 27 to 34%.
  • the content of Al 2 O 3 may be 6.5%, 7%, 7.5%, 8%, 8.5%, or 9%, etc., or may be any other value within the range of 6.5 to 9.0%.
  • the content of Fe 2 O 3 may be 0.5%, 1%, 1.5%, or 2%, etc., or may be any other value within the range of 0.5 to 2%.
  • the content of MgO may be 1%, 1.5%, 2%, 2.5%, or 3%, etc., or may be any other value within the range of 1 to 3%.
  • the content of Na 2 O may be 4.5%, 5%, 6%, 7%, or 8%, etc., or may be any other value within the range of 4.5 to 8.0%.
  • the content of F - may be 4%, 4.5%, 5%, 5.5%, or 6%, etc., or may be any other value within the range of 4.0 to 6%.
  • the content of Li 2 O may be 0.18%, 0.5%, 0.8%, 1%, 1.5%, or 1.6%, etc., or may be any other value within the range of 0.18 to 1.6%.
  • the content of B 2 O 3 may be 0.48%, 0.5%, 1%, 1.5%, or 2%, etc., or may be any other value within the range of 0.48 to 2%.
  • the content of BaO may be 0.35%, 0.5%, 1%, 1.5%, or 1.6%, etc., or may be any other value within the range of 0.35 to 1.6%.
  • the content of MnO may be 2.8%, 3%, 4%, 5%, or 5.5%, etc., and may be any other value within the range of 2.8 to 5.5%.
  • the content of Ct may be 3%, 4%, 5%, or 6%, etc., and may be any other value within the range of 3 to 6.
  • the above chemical composition includes 24.6-27.36% CaO, 28.16-33.67% SiO 2 , 6.7-8.72% Al 2 O 3 , 0.8-0.95% Fe 2 O 3 , 1.79-2.74% MgO, 4.95-7.95% Na 2 O, 4.63-5.84% F - , 0.31-1.44% Li 2 O, 0.48-1.92% B 2 O 3 , 0.38-0.81% BaO, 3-4.64% MnO and 3.65 to 5.8% of Ct, and the balance is unavoidable impurities.
  • Ct refers to total carbon, that is, all forms of C.
  • the raw materials of the continuous casting mold powder for sorbite stainless steel include glass powder, cement clinker, industrial soda ash, fluorite, pre-melting material, wollastonite, lithium carbonate, sodium fluoride, light-burned magnesia Powder, bentonite, cryolite, bauxite, borax, barium carbonate, manganese carbonate, dispersants, carbon black and binders.
  • the raw materials include 1.5-5 parts of glass powder, 1-7 parts of cement clinker, 0.5-4.0 parts of industrial soda ash, 0.5-5.0 parts of fluorite, pre-melting material and wollastonite in a total of 45 parts ⁇ 60 parts, lithium carbonate 0.5-4.0 parts, sodium fluoride 1.0-5.0 parts, light burnt magnesia powder 0.5-2.0 parts, bentonite 2.0-4 parts, cryolite 2.0-5.0 parts, bauxite 6-10 parts, 1-4 parts of borax, 0.5-2 parts of barium carbonate, 4-7 parts of manganese carbonate, 0.5-3.0 parts of dispersant, 1.5-4.0 parts of carbon black and 0.5-3.0 parts of binder.
  • the glass frit can be 1.5 parts, 2 parts, 3 parts, 4 parts, or 5 parts, etc., and can also be any other value within the range of 1.5 to 5 parts.
  • Cement clinker may be 1 part, 3 parts, 5 parts, or 7 parts, etc., and may be any other value within the range of 1 to 7 parts.
  • Both industrial soda ash and lithium carbonate may be 0.5 parts, 1 part, 2 parts, 3 parts, or 4 parts, etc., respectively, and may also be any other value within the range of 0.5 to 4.0 parts.
  • Fluorite may be 0.5 parts, 1 part, 2 parts, 3 parts, 4 parts, or 5 parts, etc., and may be any other value within the range of 0.5 to 5 parts.
  • the total amount of the pre-melt and wollastonite may be 45 parts, 50 parts, 55 parts, or 60 parts, etc., and may be any other value within the range of 45 to 60 parts.
  • the mass ratio of the pre-melt and wollastonite may be 30-50:50-70, such as 30:70, 40:60 or 50:50, etc.
  • the pre-melting material can be made of limestone, wollastonite, calcite, fluorite, white alkali, glass, etc., which are pre-melted at high temperature and then cooled and ground.
  • Sodium fluoride may be 1 part, 2 parts, 3 parts, 4 parts, 5 parts, etc., and may be any other value within the range of 1 to 5 parts.
  • Light-burned magnesia powder and barium carbonate may be 0.5 parts, 1 part, 1.5 parts, or 2 parts, etc., respectively, or may be any other value within the range of 0.5 to 2.0 parts.
  • Bentonite may be 2 parts, 2.5 parts, 3 parts, 3.5 parts, or 4 parts, etc., and may be any other value within the range of 2.0 to 4 parts.
  • the amount of cryolite may be 2 parts, 3 parts, 4 parts, or 5 parts, etc., and may be any other value within the range of 2.0 to 5.0 parts.
  • the amount of bauxite may be 6 parts, 7 parts, 8 parts, 9 parts, or 10 parts, etc., and may be any other value within the range of 6 to 10 parts.
  • Borax may be 1 part, 2 parts, 3 parts, or 4 parts, etc., and may be any other value within the range of 1 to 4 parts.
  • Manganese carbonate may be 4 parts, 5 parts, 6 parts, or 7 parts, etc., and may be any other value within the range of 4 to 7 parts.
  • Both the dispersant and the binder may be 0.5 parts, 1 part, 2 parts, or 3 parts, etc., respectively, and may be any other value within the range of 0.5 to 3.0 parts.
  • the dispersing agent can be selected from the dispersing agent substances commonly used in the art, which will not be repeated here.
  • the binder can be selected from sodium carboxymethyl cellulose, and can also be used as a binder material commonly used in the art.
  • Carbon black may be 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, or 4 parts, etc., and may be any other value within the range of 1.5 to 4.0 parts.
  • the raw materials include 1.5-5 parts of glass frit, 1.5-6.6 parts of cement clinker, 0.5-3.5 parts of industrial soda ash, 0.5-4.5 parts of fluorite, and a total of 48.5 parts of pre-melting material and wollastonite.
  • lithium carbonate 0.8-3.7 parts, sodium fluoride 1-5.0 parts, light-burned magnesia powder 0.5-1.5 parts, bentonite 2.0-4 parts, cryolite 2.0-4.8 parts, bauxite 6-9 parts, 1-4 parts of borax, 1-2 parts of barium carbonate, 4-6.5 parts of manganese carbonate, 0.5-3.0 parts of dispersant, 1.9-3.6 parts of carbon black and 0.8-2.5 parts of sodium carboxymethyl cellulose.
  • adding the above-mentioned content of lithium carbonate can increase the melting range, improve the lubrication effect in the whole process, and prevent the crack and depression defects of the high alloy steel. If the usage amount of lithium carbonate is lower than the above range, the effect will not be achieved, and if it exceeds the above range, the effect is not obvious.
  • boron oxide has the effect of melting the chromium element and expanding the melting range.
  • Boron oxide is mainly introduced from borax material. When the amount of borax used exceeds the above range, it has a great influence on the melting point viscosity.
  • barium carbonate can also improve the lubricating effect and increase the specific gravity of the mold slag to prevent the fluctuation of the liquid level.
  • the addition of barium carbonate is mainly to provide BaO, and the amount of barium carbonate used exceeds the above range will affect the basicity of the mold slag.
  • the addition of manganese carbonate in the above content can not only increase the weak cooling capacity of the solid slag film, but also increase the saturation of inclusions such as alumina, improve the overall stability of the mold slag, and prevent the mold slag from being severely denatured during use, affecting the mold slag performance. effective performance.
  • the addition of manganese carbonate is mainly to provide MnO.
  • this application adopts the ratio of pre-melted material + wollastonite composite base material to meet the thermal conductivity requirements of this steel type, and to prevent the occurrence of cracks in the heat transfer too fast or the billet shell caused by too slow heat transfer. Bonded breakout with too thin thickness.
  • the binary basicity of the mold slag for continuous casting of sorbite stainless steel provided in this application is 0.8-0.9, the melting point is 1130-1170°C, and the viscosity at 1300°C is 0.4-0.6 Pa ⁇ S.
  • the binary basicity of the mold slag for continuous casting of sorbite stainless steel is 0.81-0.9, the melting point is 1135-1165°C, and the viscosity at 1300°C is 0.42-0.55 Pa ⁇ S.
  • the binary basicity (CaO/SiO 2 ) is set to 0.8-0.9, within this basicity range, the influence on the shrinkage rate of the slab caused by the relatively low content of chromium and nickel in the steel can be prevented, for example, in the casting process. At the same time, it can prevent the problem of cracks in this series of steels caused by high content of phosphorus and sulfur.
  • the high temperature strength is relatively low, and weak cooling is required to make the thickness of the slab grow evenly. It cannot be too low, and needs to be controlled in an appropriate range.
  • the melting point is set to 1130°C to 1170°C.
  • the viscosity is set at 0.4 ⁇ 0.6Pa ⁇ s at 1300°C.
  • the above-mentioned higher viscosity can ensure the uniformity of the slag film of the mold slag and control the proper fluidity, and prevent the slag film from flowing too well. Uneven heat.
  • the above viscosity range can also prevent slag inclusion, oxidation and changes in oxygen, sulfur, phosphorus and other components of the steel due to liquid level fluctuations during the casting process. Combined with the continuous casting process parameters such as pulling speed and section, it is more appropriate to control the viscosity at 0.4-0.6Pa.s.
  • This embodiment provides a continuous casting mold powder for sorbite.
  • the raw materials include 5.0 parts of glass powder, 1.5 parts of cement clinker, 0.5 parts of industrial soda ash, 4.5 parts of fluorite, and pre-melting material.
  • a total of 57 parts with wollastonite (the mass ratio of pre-melted material and wollastonite is 50:50), 2 parts of lithium carbonate, 3.0 parts of sodium fluoride, 1.5 parts of light burned magnesia powder, 4.0 parts of bentonite, 2.8 parts of cryolite parts, 6.0 parts of bauxite, 1 part of borax, 1.5 parts of barium carbonate, 6.5 parts of manganese carbonate, 0.5 part of dispersant, 1.9 parts of carbon black and 0.8 part of sodium carboxymethyl cellulose.
  • the mold flux contains the following chemical components: CaO 27.36%, SiO 2 33.67%, Al 2 O 3 6.7%, Fe 2 O 3 0.8%, MgO 2.74%, Na 2 O 4.95%, F - 5.84 %, Li 2 O 0.78%, B 2 O 3 0.48%, BaO 0.54%, MnO 4.64%, and total C(Ct) 3.65%, and the balance is unavoidable impurities.
  • the physical index of the mold residue is the binary basicity (CaO/SiO 2 mass ratio) of 0.81, the melting point of 1135°C, and the viscosity at 1300°C of 0.55 Pa.S.
  • This embodiment provides a continuous casting mold powder for sorbite.
  • the raw materials include 3.5 parts of glass powder, 3.5 parts of cement clinker, 3.0 parts of industrial soda ash, 3.5 parts of fluorite, and pre-melting material.
  • a total of 48.5 parts with wollastonite (the mass ratio of pre-melt and wollastonite is 40:60), 3.7 parts of lithium carbonate, 1.0 parts of sodium fluoride, 1.0 parts of light burned magnesia powder, 3.2 parts of bentonite, 4.8 parts of cryolite parts, 7.0 parts of bauxite, 2.5 parts of borax, 2 parts of barium carbonate, 5.5 parts of manganese carbonate, 2.0 parts of dispersant, 2.8 parts of carbon black and 2.5 parts of sodium carboxymethyl cellulose.
  • the mold flux contains the following chemical components: CaO 24.6%, SiO 2 28.91%, Al 2 O 3 7.47%, Fe 2 O 3 0.878%, MgO 2.01%, Na 2 O 5.32%, F - 5.1 %, Li 2 O 1.44%, B 2 O 3 1.2%, BaO 0.81%, MnO 4.08%, and total C(Ct) 4.36%, and the balance is unavoidable impurities.
  • the physical index of the mold residue is the binary basicity (CaO/SiO 2 mass ratio) of 0.85, the melting point of 1148°C, and the viscosity at 1300°C of 0.51 Pa ⁇ S.
  • This embodiment provides a continuous casting mold mold powder for sorbite.
  • the raw materials include 1.5 parts of glass powder, 6.6 parts of cement clinker, 3.5 parts of industrial soda ash, 0.5 parts of fluorite, and pre-melting material.
  • a total of 51.5 parts with wollastonite (the mass ratio of pre-melted material and wollastonite is 30:70), 0.8 parts of lithium carbonate, 5.0 parts of sodium fluoride, 0.5 parts of light burnt magnesia powder, 2.0 parts of bentonite, 2.0 parts of cryolite parts, 9.0 parts of bauxite, 4.0 parts of borax, 1.0 parts of barium carbonate, 4.0 parts of manganese carbonate, 3.0 parts of dispersant, 3.6 parts of carbon black and 1.5 parts of sodium carboxymethyl cellulose.
  • the mold flux contains the following chemical components: CaO 25.23%, SiO 2 28.16%, Al 2 O 3 8.72%, Fe 2 O 3 0.95%, MgO 1.79%, Na 2 O 7.95%, F - 4.63 %, Li 2 O 0.31%, B 2 O 3 1.92%, BaO 0.38%, MnO 3.0%, and total C(Ct) 5.8%, and the balance is unavoidable impurities.
  • the physical index of the mold residue is the binary basicity (CaO/SiO 2 mass ratio) of 0.9, the melting point of 1165°C, and the viscosity at 1300°C of 0.42 Pa.S.
  • the flame is active around the mold, there is no agglomeration phenomenon, the spreadability is good, and there is no obvious slag strips, and the slag processing process does not need to pick slag; the thickness of the liquid slag layer is measured to be 9-12mm, and the slag
  • the consumption is 0.4Kg/ton, which is in the normal range; this consumption can meet the technical requirements of sorbite stainless steel and provide good lubrication effect.
  • the thermocouple has no obvious rise or fall, and no sticking alarm occurs.
  • the qualified rate of cast billet surface quality is 98.6%. It shows that the casting slag can cast the casting billet with good quality, which can meet the requirements of the continuous casting process of sorbite stainless steel.
  • the continuous casting mold powder for sorbite stainless steel obtained in the above examples 1-3 has good lubrication and heat transfer effects, and can well promote the continuous casting process of sorbite stainless steel. , to ensure high-quality billet quality.
  • This comparative example provides a conventional 300 series stainless steel continuous casting mold powder, in terms of parts by mass, the raw material composition is as follows: 3.5 parts of glass powder, 5.5 parts of cement clinker, 4.5 parts of industrial soda ash, fluorite 3.8 parts, a total of 57 parts of pre-melting material and wollastonite (the mass ratio of pre-melting material and wollastonite is 60:40), 2 parts of lithium carbonate, 3.5 parts of sodium fluoride, 1.5 parts of light burnt magnesia powder, calcite 2.8 parts, 4.5 parts of cryolite, 9.2 parts of bauxite, 0.5 part of dispersant, 1.2 parts of carbon black, and 0.5 part of sodium carboxymethyl cellulose.
  • the mold flux contains the following chemical components: CaO 34.52%, SiO 2 29.76%, Al 2 O 3 8.3%, Fe 2 O 3 1.14%, MgO 1.26%, Na 2 O 5.45%, F - 3.65 %, Li 2 O 0.78%, total C(Ct) 3.68%, and the balance is unavoidable impurities.
  • the physical index of the mold residue is the binary basicity (CaO/SiO 2 mass ratio) of 1.16, the melting point of 1142°C, and the viscosity at 1300°C of 0.18 Pa.S.
  • the results show that the performance of the mold slag of the comparative example is significantly worse than that of the mold slag of the embodiment 1-3, the thickness of the liquid slag layer is 6mm during the use in the crystallizer, and the consumption is 0.6kg /T, the liquid slag layer is too thin, the consumption is too large, the stability of the mold slag is reduced, the liquid slag layer cannot effectively meet the casting needs, cannot be fully filled between the shell and the mold, and cannot ensure sufficient lubrication effect, casting During the process, uneven lubrication, excessive heat transfer, unstable heat flow curve, and uneven surface of the cast billet, with center depression longitudinal cracks and deep vibration marks are prone to occur. At the same time, the liquid slag is thin, and defects such as slag entrainment are prone to occur.
  • the continuous casting mold mold powder for sorbite stainless steel provided in the examples of the present application has better performance than the continuous casting mold mold mold powder for sorbite stainless steel in the comparative example.
  • the embodiment provides more continuous casting mold powder for sorbite stainless steel, which can effectively ensure that the casting process of sorbite stainless steel goes smoothly and prevent crack defects.
  • the continuous casting mold powder for sorbite stainless steel provided by the present application is applied to the continuous casting of sorbite stainless steel, which can effectively solve the problem of reducing the shrinkage rate of this series of steel grades caused by chromium and nickel elements in sorbite stainless steel and causing phosphorus,
  • the high content of sulfur element causes the high crack sensitivity of this series of steel grades to cause various surface quality problems such as cracks, depressions, and scarring.
  • the continuous casting mold slag for sorbite stainless steel provided by this application is applied to continuous casting of sorbite stainless steel, which can effectively solve the problem of reducing the shrinkage rate of this series of steel grades caused by chromium and nickel elements in sorbite stainless steel and the content of phosphorus and sulfur elements.
  • the high crack sensitivity of this series of steel grades causes a variety of surface quality problems such as cracks, depressions, and scarring.

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Abstract

一种索氏体不锈钢专用连铸结晶器保护渣,按质量百分数计,该保护渣的化学成分包括23~30%的CaO、27~34%的SiO 2、6.5~9.0%的Al 2O 3、0.5~2%的Fe 2O 3、1~3%的MgO、4.5~8.0%的Na 2O、4.0~6%的F -、0.18~1.6%的Li 2O、0.48~2%的B 2O 3、0.35~1.6%的BaO、2.8~5.5%的MnO以及3~6%的Ct,余量为不可避免的杂质。以及一种该保护渣在索氏体不锈钢的连铸中的应用。该保护渣适用于S600E索氏体不锈钢的连铸,其原材料选择及性能指标设计合理,具备良好的润滑兼控制传热效果,可确保索氏体不锈钢连铸工艺顺行,获得良好的铸坯质量。

Description

一种索氏体不锈钢专用连铸结晶器保护渣及其应用
相关申请的交叉引用
本申请要求于2020年12月16日提交中国国家知识产权局的申请号为202011486492.1、名称为“一种索氏体不锈钢专用连铸结晶器保护渣及其应用”的中国专利申请的优先权,其全部内容通过引用结合在本申请中。
技术领域
本申请涉及炼钢辅料技术领域,具体而言,涉及一种索氏体不锈钢专用连铸结晶器保护渣及其应用。
背景技术
当今钢铁市场对钢结构材料的长寿命、高强度、易焊接、可接受成本的要求不断增加,索氏体不锈钢S600E克服了奥氏体不锈钢、铁素体不锈钢的强度不低的问题;克服了普通结构钢锈蚀问题;腐蚀性能和双相钢接近,但成本只有其1/3;在600兆帕屈服强度下,S600E仍有大于20%的延伸率,强度与日本最高水平的高强抗震钢相当;S600E的抗腐蚀程度是常规碳钢的150倍,使用这种钢材的建筑寿命可以从现在的70年延长至500年以上;这种钢在600度高温条件下还具备大于200兆帕的屈服强度,是一种建筑界梦寐以求的低成本耐火钢;在零下40度的低温下仍具有大于40J的冲击功。
S600E其主要成分为铁元素,以8~16wt%的铬元素和1~5wt%的镍元素为主导合金元素,其他含0.01~0.1wt%的磷元素,小于0.04wt%的硫元素,氧 元素含量小于30ppm。
2019年8月,索氏体不锈钢S600E研发成果开始投入生产,该系列产品可广泛应用于跨海大桥建设、海洋石油平台建造、海洋工程建设、舰船建造、电力输送工程、海洋运输设施等诸多对耐腐蚀、强度及可焊性要求较高的工程建设领域以及光伏工程、风电工程和新能源建设的某些领域。在一些条件下还可以替代双相不锈钢等高价格品种在这些领域的使用,满足高强度、高耐蚀以及可焊性的要求。当前南沙建设、海洋石油平台建设、油气输送包覆管、超临界机组与超临界机组脱硫工程以及新能源建设等领域更是迫切需要此类钢材。
由于索氏体不锈钢S600E为新兴钢种,机械性能方面抗拉强度不低于600MPa,非比例延伸强度RP0.2不低于500MPa,断后延伸率不小于14%,通过定级测定,索氏体晶粒度控制保持在8级以上,中性盐雾腐蚀条件下的比较腐蚀速度是Q345的30~80倍。
目前,索氏体不锈钢S600E连铸过程中使用其他类不锈钢用结晶器保护渣如200系、300系、400系均出现了不同情况的粘结漏钢、凹陷、夹渣、裂纹等质量问题,影响了索氏体不锈钢S600E连铸工艺顺行、阻碍了其产量规模化扩张;各种铸坯质量问题致使修磨率居高不下甚至铸坯报废,严重影响生产顺行。
目前现有技术中尚未有专用连铸保护渣可以很好的解决该问题,因此研发此专用不锈钢保护渣势在必行。
鉴于此,特提出本申请。
发明内容
本申请的目的之一包括提供一种索氏体不锈钢专用连铸结晶器保护渣以解决上述技术问题。
本申请的目的之二包括提供一种上述索氏体不锈钢专用连铸结晶器保护渣在索氏体不锈钢的连铸中的应用。
本申请可这样实现:
第一方面,本申请提供一种索氏体不锈钢专用连铸结晶器保护渣,按质量百分数计,索氏体不锈钢专用连铸结晶器保护渣的化学成分包括23~30%的CaO、27~34%的SiO 2、6.5~9.0%的Al 2O 3、0.5~2%的Fe 2O 3、1~3%的MgO、4.5~8.0%的Na 2O、4.0~6%的F -、0.18~1.6%的Li 2O、0.48~2%的B 2O 3、0.35~1.6%的BaO、2.8~5.5%的MnO以及3~6%的Ct,余量为不可避免的杂质。
可选地,上述化学成分包括24.6~27.36%的CaO、28.16~33.67%的SiO 2、6.7~8.72%的Al 2O 3、0.8~0.95%的Fe 2O 3、1.79~2.74%的MgO、4.95~7.95%的Na 2O、4.63~5.84%的F -、0.31~1.44%的Li 2O、0.48~1.92%的B 2O 3、0.38~0.81%的BaO、3~4.64%的MnO以及3.65~5.8%的Ct,余量为不可避免的杂质。
可选地,索氏体不锈钢专用连铸结晶器保护渣的原料包括玻璃粉、水泥熟料、工业纯碱、萤石、预熔料、硅灰石、碳酸锂、氟化钠、轻烧镁砂粉、膨润土、冰晶石、铝矾土、硼砂、碳酸钡、碳酸锰、分散剂、炭黑以及粘合剂。
可选地,按质量份数计,原料包括玻璃粉1.5~5份、水泥熟料1~7份、工业纯碱0.5~4.0份、萤石0.5~5.0份、预熔料和硅灰石共45~60份、碳酸锂0.5~4.0份、氟化钠1.0~5.0份、轻烧镁砂粉0.5~2.0份、膨润土2.0~4份、冰晶石2.0~5.0份、铝矾土6~10份、硼砂1~4份、碳酸钡0.5~2份、碳酸锰4~7份、分散剂0.5~3.0份、炭黑1.5~4.0份以及粘合剂0.5~3.0份。
可选地,预熔料和硅灰石的质量比为30-50:50-70。
可选地,按质量份数计,原料包括玻璃粉1.5~5份、水泥熟料1.5~6.6份、工业纯碱0.5~3.5份、萤石0.5~4.5份、预熔料和硅灰石共48.5~57份、碳酸锂0.8~3.7份、氟化钠1.5~5.0份、轻烧镁砂粉0.5~1.5份、膨润土2.0~ 4份、冰晶石2.0~4.8份、铝矾土6~9份、硼砂1~4份、碳酸钡1~2份、碳酸锰4~6.5份、分散剂0.5~3.0份、炭黑1.9~3.6份以及粘合剂0.8~2.5份。
可选地,所述粘合剂为羧甲基纤维素钠。
可选地,索氏体不锈钢专用连铸结晶器保护渣的二元碱度为0.8~0.9。
可选地,所述二元碱度为CaO/SiO 2的质量比。
可选地,索氏体不锈钢专用连铸结晶器保护渣的熔点为1130~1170℃。
可选地,索氏体不锈钢专用连铸结晶器保护渣在1300℃下的粘度为0.4~0.6Pa·S。
可选地,索氏体不锈钢专用连铸结晶器保护渣的二元碱度为0.81~0.9。
可选地,索氏体不锈钢专用连铸结晶器保护渣的熔点为1135~1165℃。
可选地,索氏体不锈钢专用连铸结晶器保护渣在1300℃下的粘度为0.42~0.55Pa·S。
第二方面,本申请提供如前述实施方式任一项的索氏体不锈钢专用连铸结晶器保护渣在索氏体不锈钢的连铸中的应用。
可选地,索氏体不锈钢的型号为S600E。
本申请的有益效果包括:
通过按本申请提供的特定化学成分设置索氏体不锈钢的连铸时所用的保护渣,可减少索氏体不锈钢收缩率低的影响,同时可缓解因硫、磷元素而产生裂纹的影响,还能降低振痕对轧制质量的影响和导热的稳定性;防止索氏体不锈钢在连铸过程中钢液面结冷钢,减少夹渣和夹杂物对铸坯质量的影响,吸附钢水表面的夹杂物,提高钢水纯净度,润滑铸坯,解决索氏体不锈钢连铸生产过程中出现的裂纹、凹陷、夹渣、结疤等多种铸坯表面质量问题。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚,下面将对本申请实施例中的技术方案进行清楚、完整地描述。实施例中未注明具体条件者,按照常规条件或制造商建议的条件进行。所用试剂或仪器未注明生产厂商者,均为可以通过市售购买获得的常规产品。
下面对本申请提供的索氏体不锈钢专用连铸结晶器保护渣及其应用进行具体说明。
发明人通过研究得出:S600E索氏体不锈钢中所含的铬、镍元素使该系列钢种与其它不锈钢比收缩率降低,导致铸坯与铜板之间的间隙变小,在一定拉速情况下铸坯与铜板之间摩擦力增大,导致保护渣下渣量降低,影响正常的润滑和传热的均匀性,影响保护渣熔化和消耗的平衡,容易出现粘结漏钢;并且,其所含的磷和硫元素含量均较高,容易造成该系列钢种裂纹敏感度高。
鉴于此,发明人创造性地提出主要从提高下渣量(即提高铸坯的润滑效果)和增加弱冷能力两个方面设置保护渣成分,同时兼顾提高保护渣的保温性和吸附夹杂能力。
其中,对于提高下渣量,可适当降低碱度增加渣膜的玻璃化程度。在增加弱冷性方面,可适当将熔点控制高些,降低传热性增加弱冷性;同时适当提高粘度,减小导热系数,降低热传导性,并减缓振痕对轧制质量的影响。在提高保护渣保温性方面,主要可通过提高熔点增加钢液面温度和提高粘度增加液渣层的厚度防止辐射散热,同时适当提高全碳含量增加保温性能,以防止钢液面结冷钢影响熔化和浇铸工艺顺行。在提高吸附夹杂能力以及减少夹杂物对钢水的影响和冷坯强度的影响方面,主要可通过提高产品中氧化硼、氧化锂和氧化锰含量,减少氧化铝等夹杂物的含量,提高吸附夹杂能力。
可参照地,本申请提出的索氏体不锈钢专用连铸结晶器保护渣,按质量百分数计,索氏体不锈钢专用连铸结晶器保护渣的化学成分包括23~30%的 CaO、27~34%的SiO 2、6.5~9.0%的Al 2O 3、0.5~2%的Fe 2O 3、1~3%的MgO、4.5~8.0%的Na 2O、4.0~6%的F -、0.18~1.6%的Li 2O、0.48~2%的B 2O 3、0.35~1.6%的BaO、2.8~5.5%的MnO以及3~6%的Ct,余量为不可避免的杂质。
可参考,CaO的含量可以为23%、25%、28%或30%,也可以为23~30%范围内的其它任意值。
SiO 2的含量可以为27%、30%、32%或34%等,也可以为27~34%范围内的其它任意值。
Al 2O 3的含量可以为6.5%、7%、7.5%、8%、8.5%或9%等,也可以为6.5~9.0%范围内的其它任意值。
Fe 2O 3的含量可以为0.5%、1%、1.5%或2%等,也可以为0.5~2%范围内的其它任意值。
MgO的含量可以为1%、1.5%、2%、2.5%或3%等,也可以为1~3%范围内的其它任意值。
Na 2O的含量可以为4.5%、5%、6%、7%或8%等,也可以为4.5~8.0%范围内的其它任意值。
F -的含量可以为4%、4.5%、5%、5.5%或6%等,也可以为4.0~6%范围内的其它任意值。
Li 2O的含量可以为0.18%、0.5%、0.8%、1%、1.5%或1.6%等,也可以为0.18~1.6%范围内的其它任意值。
B 2O 3的含量可以为0.48%、0.5%、1%、1.5%或2%等,也可以为0.48~2%范围内的其它任意值。
BaO的含量可以为0.35%、0.5%、1%、1.5%或1.6%等,也可以为0.35~1.6%范围内的其它任意值。
MnO的含量可以为2.8%、3%、4%、5%或5.5%等,也可以为2.8~5.5% 范围内的其它任意值。
Ct的含量可以为3%、4%、5%或6%等,也可以为3~6范围内的其它任意值。
可选地,上述化学成分包括24.6~27.36%的CaO、28.16~33.67%的SiO 2、6.7~8.72%的Al 2O 3、0.8~0.95%的Fe 2O 3、1.79~2.74%的MgO、4.95~7.95%的Na 2O、4.63~5.84%的F -、0.31~1.44%的Li 2O、0.48~1.92%的B 2O 3、0.38~0.81%的BaO、3~4.64%的MnO以及3.65~5.8%的Ct,余量为不可避免的杂质。
值得说明的是,上述“Ct”指全炭,也即所有形式的C。
本申请中,索氏体不锈钢专用连铸结晶器保护渣的原料包括玻璃粉、水泥熟料、工业纯碱、萤石、预熔料、硅灰石、碳酸锂、氟化钠、轻烧镁砂粉、膨润土、冰晶石、铝矾土、硼砂、碳酸钡、碳酸锰、分散剂、炭黑以及粘合剂。
可选地,按质量份数计,原料包括玻璃粉1.5~5份、水泥熟料1~7份、工业纯碱0.5~4.0份、萤石0.5~5.0份、预熔料和硅灰石共45~60份、碳酸锂0.5~4.0份、氟化钠1.0~5.0份、轻烧镁砂粉0.5~2.0份、膨润土2.0~4份、冰晶石2.0~5.0份、铝矾土6~10份、硼砂1~4份、碳酸钡0.5~2份、碳酸锰4~7份、分散剂0.5~3.0份、炭黑1.5~4.0份以及粘合剂0.5~3.0份。
可参照地,玻璃粉可以为1.5份、2份、3份、4份或5份等,也可以为1.5~5份范围内的其它任意值。
水泥熟料可以为1份、3份、5份或7份等,也可以为1~7份范围内的其它任意值。
工业纯碱和碳酸锂均分别可以为0.5份、1份、2份、3份或4份等,也可以为0.5~4.0份范围内的其它任意值。
萤石可以为0.5份、1份、2份、3份、4份或5份等,也可以为0.5~5份范围内的其它任意值。
预熔料和硅灰石共计可以为45份、50份、55份或60份等,也可以为45~60份范围内的其它任意值。可参考地,预熔料和硅灰石的质量比可以为30-50:50-70,如30:70、40:60或50:50等。预熔料可采用石灰石、硅灰石、方解石、萤石、白碱、玻璃等经高温预熔后冷却研磨而成。
氟化钠可以为1份、2份、3份、4份或5份等,也可以为1~5份范围内的其它任意值。
轻烧镁砂粉和碳酸钡分别可以为0.5份、1份、1.5份或2份等,也可以为0.5~2.0份范围内的其它任意值。
膨润土可以为2份、2.5份、3份、3.5份或4份等,也可以为2.0~4份范围内的其它任意值。
冰晶石可以为2份、3份、4份或5份等,也可以为2.0~5.0份范围内的其它任意值。
铝矾土可以为6份、7份、8份、9份或10份等,也可以为6~10份范围内的其它任意值。
硼砂可以为1份、2份、3份或4份等,也可以为1~4份范围内的其它任意值。
碳酸锰可以为4份、5份、6份或7份等,也可以为4~7份范围内的其它任意值。
分散剂和粘合剂均分别可以为0.5份、1份、2份或3份等,也可以为0.5~3.0份范围内的其它任意值。其中,分散剂可选自本领域常用的分散剂物质,在此不做过多赘述。粘结剂可选用羧甲基纤维素钠,也可选用本领域常用的粘合剂物质。
炭黑可以为1.5份、2份、2.5份、3份、3.5份或4份等,也可以为1.5~4.0份范围内的其它任意值。
可选地,按质量份数计,原料包括玻璃粉1.5~5份、水泥熟料1.5~6.6份、工业纯碱0.5~3.5份、萤石0.5~4.5份、预熔料和硅灰石共48.5~57份、碳酸锂0.8~3.7份、氟化钠1~5.0份、轻烧镁砂粉0.5~1.5份、膨润土2.0~4份、冰晶石2.0~4.8份、铝矾土6~9份、硼砂1~4份、碳酸钡1~2份、碳酸锰4~6.5份、分散剂0.5~3.0份、炭黑1.9~3.6份以及羧甲基纤维素钠0.8~2.5份。
本申请通过引入特殊助熔剂材料,如碳酸锂、氧化硼、碳酸钡和碳酸锰等,可避免在使用过程中保护渣析出较多的枪晶石、霞石、钙铝黄长石等这类晶粒粗大的物质。适当添加碳酸锂、氧化硼、碳酸钡和碳酸锰等代替白碱和部分萤石,可在细化晶粒的同时,保证良好的晶体结构,减少夹渣和夹杂物对铸坯质量的影响;同时提高产品吸附夹杂能力及润滑效果。
具体地,添加上述含量的碳酸锂可增加熔融区间,提高全程润滑效果,防止高合金钢的裂纹凹陷缺陷。碳酸锂使用量低于上述范围达不到效果,超过上述范围影响作用不明显。
添加上述含量的氧化硼具有对铬元素的熔解作用及扩大熔融区间的作用。氧化硼主要由硼砂材料引入,硼砂使用量超过上述范围后对熔点粘度影响较大。
添加上述含量的碳酸钡也可提高润滑效果和增加保护渣比重,防止液面波动的作用。碳酸钡的加入主要是为了提供BaO,碳酸钡使用量超过上述范围会影响保护渣碱度。
添加上述含量的碳酸锰既有增加固态渣膜的弱冷能力,还可以增加氧化铝等夹杂物的饱和度,提高保护渣的整体稳定性,防止保护渣在使用过程严重变性,影响保护渣性能的有效发挥。碳酸锰的加入主要是为了提供MnO。
本申请在碳质材料选择上,采用国外进口的德库赛低硫低氮低铅等纯度高的碳黑,既满足保护渣熔化的需求,还可防止有害微量元素对钢液的影响。
本申请在基础材料的选择上,采用预熔料+硅灰石复合基料配比,满足该钢种的导热性要求,防止过快传热出现裂纹或过慢传热导致的铸坯坯壳厚度过薄的粘结漏钢。
此外,通过采用部分化工材料(如硼砂)代替部分矿物材料(如萤石),可防止引入有害微量元素及夹杂物导致的对钢水成分的影响。
本申请中提供的索氏体不锈钢专用连铸结晶器保护渣的二元碱度为0.8~0.9,熔点为1130~1170℃,在1300℃下的粘度为0.4~0.6Pa·S。在优选的实施方式中,索氏体不锈钢专用连铸结晶器保护渣的二元碱度为0.81~0.9,熔点为1135~1165℃,1300℃下的粘度为0.42~0.55Pa·S。
其中,二元碱度(CaO/SiO 2)设置为0.8~0.9,在该碱度范围内可防止由于该钢种铬、镍含量相对少对铸坯收缩率造成的影响,例如导致在浇铸过程中摩擦力过大引起的粘结,同时还可防止因磷、硫元素含量高而造成该系列钢种出现裂纹的问题。
作为高合金钢,特别是铬镍的含量高,导致高温强度比较低,需要弱冷才可使铸坯厚度生长均匀,同时该钢种收缩率比较小,下渣量少,因此熔点不能太高也不能太低,需要控制在适当范围,本申请将其熔点设置为1130℃~1170℃。
粘度设置在1300℃下0.4~0.6Pa·s,上述较高的粘度可保证保护渣的渣膜的均匀性和控制适当的流动性,防止渣膜流动太好导致的渣膜不均匀以及影响传热的不均匀。同时上述粘度范围,还可防止该钢种在浇铸过程中因液面波动等引起的夹渣、氧化及氧、硫、磷等成分的变化。结合拉速、断面等连铸工艺参数,将粘度控制在0.4~0.6Pa.s比较合适。
承上,将上述索氏体不锈钢专用连铸结晶器保护渣用于索氏体不锈钢的连铸,尤其是型号为S600E的索氏体不锈钢的连铸,可减少索氏体不锈钢收缩率低的影响,同时可缓解因硫、磷元素而产生裂纹的影响,还能降低振痕对轧 制质量的影响和导热的稳定性;防止索氏体不锈钢在连铸过程中钢液面结冷钢,减少夹渣和夹杂物对铸坯质量的影响,吸附钢水表面的夹杂物,提高钢水纯净度,润滑铸坯,解决索氏体不锈钢连铸生产过程中出现的裂纹、凹陷、夹渣、结疤等多种铸坯表面质量问题。
以下结合实施例对本申请的特征和性能作进一步的详细描述。
实施例1
本实施例提供一种索氏体用连铸结晶器保护渣,按质量份数计,其原料含有玻璃粉5.0份、水泥熟料1.5份、工业纯碱0.5份、萤石4.5份、预熔料和硅灰石共57份(预熔料和硅灰石的质量比为50:50)、碳酸锂2份、氟化钠3.0份、轻烧镁砂粉1.5份、膨润土4.0份、冰晶石2.8份、铝矾土6.0份、硼砂1份、碳酸钡1.5份、碳酸锰6.5份、分散剂0.5份、炭黑1.9份以及羧甲基纤维素钠0.8份。
按质量百分数计,该保护渣中含有以下化学成分:CaO 27.36%、SiO 2 33.67%、Al 2O 3 6.7%、Fe 2O 3 0.8%、MgO 2.74%、Na 2O 4.95%、F - 5.84%、Li 2O 0.78%、B 2O 3 0.48%、BaO 0.54%、MnO 4.64%以及全C(Ct)3.65%,余量为不可避免的杂质。
该保护渣的物理指标二元碱度(CaO/SiO 2质量比)为0.81,熔点为1135℃,1300℃下的粘度为0.55Pa.S。
实施例2
本实施例提供一种索氏体用连铸结晶器保护渣,按质量份数计,其原料含有玻璃粉3.5份、水泥熟料3.5份、工业纯碱3.0份、萤石3.5份、预熔料和硅灰石共48.5份(预熔料和硅灰石的质量比为40:60)、碳酸锂3.7份、氟化钠1.0份、轻烧镁砂粉1.0份、膨润土3.2份、冰晶石4.8份、铝矾土7.0份、硼砂2.5份、碳酸钡2份、碳酸锰5.5份、分散剂2.0份、炭黑2.8份以及羧甲基纤维素钠2.5份。
按质量百分数计,该保护渣中含有以下化学成分:CaO 24.6%、SiO 2 28.91%、Al 2O 3 7.47%、Fe 2O 3 0.878%、MgO 2.01%、Na 2O 5.32%、F - 5.1%、Li 2O 1.44%、B 2O 3 1.2%、BaO 0.81%、MnO 4.08%以及全C(Ct)4.36%,余量为不可避免的杂质。
该保护渣的物理指标二元碱度(CaO/SiO 2质量比)为0.85,熔点为1148℃,1300℃下的粘度为0.51Pa·S。
实施例3
本实施例提供一种索氏体用连铸结晶器保护渣,按质量份数计,其原料含有玻璃粉1.5份、水泥熟料6.6份、工业纯碱3.5份、萤石0.5份、预熔料和硅灰石共51.5份(预熔料和硅灰石的质量比为30:70)、碳酸锂0.8份、氟化钠5.0份、轻烧镁砂粉0.5份、膨润土2.0份、冰晶石2.0份、铝矾土9.0份、硼砂4.0份、碳酸钡1.0份、碳酸锰4.0份、分散剂3.0份、炭黑3.6份以及羧甲基纤维素钠1.5份。
按质量百分数计,该保护渣中含有以下化学成分:CaO 25.23%、SiO 2 28.16%、Al 2O 3 8.72%、Fe 2O 3 0.95%、MgO 1.79%、Na 2O 7.95%、F - 4.63%、Li 2O 0.31%、B 2O 3 1.92%、BaO 0.38%、MnO 3.0%以及全C(Ct)5.8%,余量为不可避免的杂质。
该保护渣的物理指标二元碱度(CaO/SiO 2质量比)为0.9,熔点为1165℃,1300℃下的粘度为0.42Pa.S。
试验例
一、试验条件:
断面:200*1250mm;试验钢种:索氏体不锈钢;拉速:0.95~1.1m/min。
二、试验效果
采用实施例1-3制备的保护渣对上述工艺参数下试验3个浇次近30炉。 分别对上述浇注情况的现场使用情况进行记录并对试验铸坯的外观、内部质量进行检测,综合结果如下:
保护渣加入结晶器钢液面后沿结晶器四周火苗活跃,无结团现象,铺展性良好,无明显渣条产生,加渣工无需挑渣;经测量液渣层厚度为9~12mm,渣耗量为0.4Kg/吨,属正常范围;此耗量可以满足索氏体不锈钢工艺需求,提供良好的润滑效果。
使用过程中观察摩擦力曲线平稳,热电偶无明显升高或降低现象,并且无粘结报警情况发生。检坯统计铸坯表面质量合格率98.6%。说明该保护渣可以浇铸出质量优良的铸坯,满足索氏体不锈钢连铸工艺的需求。
由此试验看出,上述实施例1-3所得的索氏体不锈钢用连铸结晶器保护渣均具备良好的润滑兼传热效果,均能很好地促进索氏体不锈钢连铸工艺顺行,确保优质的铸坯质量。
对比例:本对比例提供一种常规300系不锈钢用连铸结晶器保护渣,按质量份数计,其原料组成如下:玻璃粉3.5份、水泥熟料5.5份、工业纯碱4.5份、萤石3.8份、预熔料和硅灰石共57份(预熔料和硅灰石的质量比为60:40)、碳酸锂2份、氟化钠3.5份、轻烧镁砂粉1.5份、方解石2.8份、冰晶石4.5份、铝矾土9.2份、分散剂0.5份、炭黑1.2份以及羧甲基纤维素钠0.5份。
按质量百分数计,该保护渣中含有以下化学成分:CaO 34.52%、SiO 2 29.76%、Al 2O 3 8.3%、Fe 2O 3 1.14%、MgO 1.26%、Na 2O 5.45%、F - 3.65%、Li 2O0.78%以及全C(Ct)3.68%,余量为不可避免的杂质。
该保护渣的物理指标二元碱度(CaO/SiO 2质量比)为1.16,熔点为1142℃,1300℃下的粘度为0.18Pa.S。
采用与实施例相同的试验条件,其结果显示:对比例的保护渣较实施例1-3的保护渣的性能明显较差,在结晶器内使用过程中液渣层厚度6mm,消耗量0.6kg/T,液渣层过薄,耗量过大,保护渣稳定性降低,液渣层不能有效满 足浇铸需要,不能充分的填充于坯壳和结晶器之间,不能保证足够的润滑效果,浇铸过程中易出现润滑不均匀,传热过快,热流曲线不稳,且浇铸出的铸坯表面不光滑,有中心凹陷纵裂、振痕深缺陷。同时液渣薄,也易出现卷渣等缺陷。
由此可以看出,本申请实施例所提供的索氏体不锈钢用连铸结晶器保护渣较对比例中的索氏体不锈钢用连铸结晶器保护渣各项性能均更佳,说明本申请实施例提供更多索氏体不锈钢用连铸结晶器保护渣能够有效保证索氏体不锈钢浇铸工艺顺行及防止裂纹缺陷。
综上,本申请提供的索氏体不锈钢用连铸结晶器保护渣应用于索氏体不锈钢连铸,可有效解决索氏体不锈钢中铬、镍元素造成该系列钢种收缩率降低及磷、硫元素含量高造成该系列钢种裂纹敏感度高而出现的裂纹、凹陷、结疤等多种铸坯表面质量问题。
以上仅为本申请的优选实施例而已,并不用于限制本申请,对于本领域的技术人员来说,本申请可以有各种更改和变化。凡在本申请的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本申请的保护范围之内。
工业实用性
本申请提供的索氏体不锈钢用连铸结晶器保护渣应用于索氏体不锈钢连铸,可有效解决索氏体不锈钢中铬、镍元素造成该系列钢种收缩率降低及磷、硫元素含量高造成该系列钢种裂纹敏感度高而出现的裂纹、凹陷、结疤等多种铸坯表面质量问题。

Claims (15)

  1. 一种索氏体不锈钢专用连铸结晶器保护渣,其特征在于,按质量百分数计,所述索氏体不锈钢专用连铸结晶器保护渣的化学成分包括23~30%的CaO、27~34%的SiO 2、6.5~9.0%的Al 2O 3、0.5~2%的Fe 2O 3、1~3%的MgO、4.5~8.0%的Na 2O、4.0~6%的F -、0.18~1.6%的Li 2O、0.48~2%的B 2O 3、0.35~1.6%的BaO、2.8~5.5%的MnO以及3~6%的Ct,余量为不可避免的杂质。
  2. 根据权利要求1所述的索氏体不锈钢专用连铸结晶器保护渣,其特征在于,所述化学成分包括24.6~27.36%的CaO、28.16~33.67%的SiO 2、6.7~8.72%的Al 2O 3、0.8~0.95%的Fe 2O 3、1.79~2.74%的MgO、4.95~7.95%的Na 2O、4.63~5.84%的F -、0.31~1.44%的Li 2O、0.48~1.92%的B 2O 3、0.38~0.81%的BaO、3~4.64%的MnO以及3.65~5.8%的Ct,余量为不可避免的杂质。
  3. 根据权利要求1或2所述的索氏体不锈钢专用连铸结晶器保护渣,其特征在于,所述索氏体不锈钢专用连铸结晶器保护渣的原料包括玻璃粉、水泥熟料、工业纯碱、萤石、预熔料、硅灰石、碳酸锂、氟化钠、轻烧镁砂粉、膨润土、冰晶石、铝矾土、硼砂、碳酸钡、碳酸锰、分散剂、炭黑以及粘合剂。
  4. 根据权利要求3所述的索氏体不锈钢专用连铸结晶器保护渣,其特征在于,按质量份数计,所述原料包括所述玻璃粉1.5~5份、所述水泥熟料1~7份、所述工业纯碱0.5~4.0份、所述萤石0.5~5.0份、所述预熔料和所述硅灰石共45~60份、所述碳酸锂0.5~4.0份、所述氟化钠1.0~5.0份、所述轻烧镁砂粉0.5~2.0份、所述膨润土2.0~4份、所述冰晶石2.0~5.0份、所述铝矾土6~10份、所述硼砂1~4份、所述碳酸钡0.5~2份、所述碳酸锰4~7份、所述分散剂0.5~3.0份、所述炭黑1.5~4.0份以及所述粘合剂0.5~3.0份。
  5. 根据权利要求4所述的索氏体不锈钢专用连铸结晶器保护渣,其特征在于,所述预熔料和所述硅灰石的质量比为30-50:50-70。
  6. 根据权利要求4或5所述的索氏体不锈钢专用连铸结晶器保护渣,其特征在于,按质量份数计,所述原料包括所述玻璃粉1.5~5份、所述水泥熟料1.5~6.6份、所述工业纯碱0.5~3.5份、所述萤石0.5~4.5份、所述预熔料和所述硅灰石共48.5~57份、所述碳酸锂0.8~3.7份、所述氟化钠1.5~5.0份、所述轻烧镁砂粉0.5~1.5份、所述膨润土2.0~4份、所述冰晶石2.0~4.8份、所述铝矾土6~9份、所述硼砂1~4份、所述碳酸钡1~2份、所述碳酸锰4~6.5份、所述分散剂0.5~3.0份、所述炭黑1.9~3.6份以及所述粘合剂0.8~2.5份。
  7. 根据权利要求3-6中任一项所述的索氏体不锈钢专用连铸结晶器保护渣,其特征在于,所述粘合剂为羧甲基纤维素钠。
  8. 根据权利要求3-7中任一项所述的索氏体不锈钢专用连铸结晶器保护渣,其特征在于,所述索氏体不锈钢专用连铸结晶器保护渣的二元碱度为0.8~0.9。
  9. 根据权利要求8所述的索氏体不锈钢专用连铸结晶器保护渣,其特征在于,所述二元碱度为CaO/SiO 2的质量比。
  10. 根据权利要求8或9所述的索氏体不锈钢专用连铸结晶器保护渣,其特征在于,所述索氏体不锈钢专用连铸结晶器保护渣的熔点为1130-1170℃。
  11. 根据权利要求10所述的索氏体不锈钢专用连铸结晶器保护渣,其特征在于,所述索氏体不锈钢专用连铸结晶器保护渣在1300℃下的粘度为0.4~0.6Pa·S。
  12. 根据权利要求11所述的索氏体不锈钢专用连铸结晶器保护渣,其特征在于,所述索氏体不锈钢专用连铸结晶器保护渣的二元碱度为0.81~0.9,熔点为1135~1165℃,1300℃下的粘度为0.42~0.55Pa·S。
  13. 根据权利要求12所述的索氏体不锈钢专用连铸结晶器保护渣,其特征在于,所述二元碱度为CaO/SiO 2的质量比。
  14. 根据权利要求1-13中任一项所述的索氏体不锈钢专用连铸结晶器保护 渣在索氏体不锈钢的连铸中的应用。
  15. 根据权利要求14所述的应用,其特征在于,所述索氏体不锈钢的型号为S600E。
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115351251A (zh) * 2022-08-23 2022-11-18 包头钢铁(集团)有限责任公司 一种含v微合金稀土钢生产用连铸结晶器保护渣

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112620598B (zh) * 2020-12-16 2022-02-11 西峡龙成冶金材料有限公司 一种索氏体不锈钢专用连铸结晶器保护渣及其应用
CN113798459B (zh) * 2021-10-26 2023-03-03 西峡龙成冶金材料有限公司 一种200系j5奥氏体不锈钢连铸专用保护渣及其应用
CN114045374B (zh) * 2021-11-19 2022-11-25 西峡龙成冶金材料有限公司 一种球墨铸铁专用保护渣及其制备方法与应用
CN114210940B (zh) * 2021-12-24 2023-07-14 西峡龙成冶金材料有限公司 一种yq450nqr1高强高耐候乙字钢用连铸结晶器保护渣及其应用
CN114713782B (zh) * 2022-05-10 2024-04-02 江苏嘉耐高温材料股份有限公司 一种稀土不锈钢用预熔型结晶器保护渣及制备方法
CN115301907A (zh) * 2022-08-16 2022-11-08 中南大学 一种新型冷镦钢保护渣

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02220749A (ja) * 1989-02-22 1990-09-03 Nisshin Steel Co Ltd ステンレス鋼の連続鋳造における初期鋳造方法
CN101947644A (zh) * 2010-08-28 2011-01-19 西峡龙成冶金材料有限公司 高锰高氮低镍不锈钢板坯连铸结晶器保护渣及其制备方法
CN104439134A (zh) * 2014-12-22 2015-03-25 河南省西保冶材集团有限公司 一种板坯430不锈钢连铸结晶器保护渣
CN106513607A (zh) * 2016-12-30 2017-03-22 河南省西保冶材集团有限公司 一种304不锈钢用连铸结晶器保护渣及其制备方法
CN108465791A (zh) * 2018-07-09 2018-08-31 西峡龙成冶金材料有限公司 一种低镍高氮奥氏体不锈钢连铸结晶器保护渣
CN112620598A (zh) * 2020-12-16 2021-04-09 西峡龙成冶金材料有限公司 一种索氏体不锈钢专用连铸结晶器保护渣及其应用

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02220746A (ja) * 1989-02-20 1990-09-03 Kawasaki Steel Corp Ti含有極低炭素鋼の連続鋳造用モールドパウダ
KR20060073340A (ko) * 2004-12-24 2006-06-28 주식회사 포스코 연속주조용 스테인레스 불룸의 슬래그베어 방지용몰드파우더
KR100650778B1 (ko) * 2005-12-23 2006-11-30 포스코신기술연구조합 오스테나이트계 스테인레스 불룸용 몰드 파우더
CN102764879B (zh) * 2012-07-25 2014-07-30 南京钢铁股份有限公司 一种高铝钢模铸保护渣
CN103785808B (zh) * 2014-02-27 2016-01-27 西峡龙成冶金材料有限公司 一种奥氏体抗菌不锈钢用结晶器保护渣
CN104308104A (zh) * 2014-09-19 2015-01-28 中南大学 一种新型保护渣及其应用
CN109954852A (zh) * 2019-04-26 2019-07-02 西峡县西保冶金材料有限公司 一种310s不锈钢用连铸结晶器保护渣
CN111360217B (zh) * 2020-04-27 2021-08-27 西峡龙成冶金材料有限公司 一种csp薄板坯合金包晶钢专用连铸结晶器保护渣及其应用

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02220749A (ja) * 1989-02-22 1990-09-03 Nisshin Steel Co Ltd ステンレス鋼の連続鋳造における初期鋳造方法
CN101947644A (zh) * 2010-08-28 2011-01-19 西峡龙成冶金材料有限公司 高锰高氮低镍不锈钢板坯连铸结晶器保护渣及其制备方法
CN104439134A (zh) * 2014-12-22 2015-03-25 河南省西保冶材集团有限公司 一种板坯430不锈钢连铸结晶器保护渣
CN106513607A (zh) * 2016-12-30 2017-03-22 河南省西保冶材集团有限公司 一种304不锈钢用连铸结晶器保护渣及其制备方法
CN108465791A (zh) * 2018-07-09 2018-08-31 西峡龙成冶金材料有限公司 一种低镍高氮奥氏体不锈钢连铸结晶器保护渣
CN112620598A (zh) * 2020-12-16 2021-04-09 西峡龙成冶金材料有限公司 一种索氏体不锈钢专用连铸结晶器保护渣及其应用

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115351251A (zh) * 2022-08-23 2022-11-18 包头钢铁(集团)有限责任公司 一种含v微合金稀土钢生产用连铸结晶器保护渣

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