A special continuous casting mold mold flux for sorbite stainless steel and its application

A continuous casting crystallizer and stainless steel technology, which is applied in the field of steelmaking auxiliary materials, can solve problems such as affecting production, billet scrapping, bonded breakout, etc., to reduce the stability of heat conduction, improve the purity of molten steel, and reduce shrinkage low rate effect

Active Publication Date: 2022-02-11
XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, mold powders for other types of stainless steel such as 200 series, 300 series, and 400 series used in the continuous casting process of Sorbitic stainless steel S600E have quality problems such as bonding breakouts, depressions, slag inclusions, and cracks in different situations. Affected the continuous casting process of Sorbitic stainless steel S600E, and hindered the large-scale expansion of its output; various billet quality problems resulted in high grinding rates and even scrapped billets, which seriously affected the smooth production
[0007] At present, there is no special continuous casting mold powder in China that can solve this problem well, so it is imperative to develop this special stainless steel mold powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] This embodiment provides a mold flux for continuous casting molds 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 premelt A total of 57 parts of wollastonite (the mass ratio of premelt and wollastonite is 50:50), 2 parts of lithium carbonate, 3.0 parts of sodium fluoride, 1.5 parts of lightly burned magnesia powder, 4.0 parts of bentonite, and 2.8 parts of cryolite 6.0 parts of bauxite, 1 part of borax, 1.5 parts of barium carbonate, 6.5 parts of manganese carbonate, 0.5 parts of dispersant, 1.9 parts of carbon black and 0.8 parts of sodium carboxymethylcellulose.

[0079] In terms of mass percentage, the mold flux contains the following chemical components: CaO27.36%, 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 O0.78%, B 2 o 3 0.48%, BaO 0.54%, MnO 4.64%, and total C (Ct) 3.65%, and the balance is unavoidable im...

Embodiment 2

[0082] This embodiment provides a mold flux for continuous casting molds 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 premelted material in parts by mass. A total of 48.5 parts of wollastonite (the mass ratio of premelted material and wollastonite is 40:60), 3.7 parts of lithium carbonate, 1.0 parts of sodium fluoride, 1.0 parts of lightly burned magnesia powder, 3.2 parts of bentonite, and 4.8 parts of cryolite 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 carboxymethylcellulose.

[0083] In terms of mass percentage, 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 ...

Embodiment 3

[0086] This embodiment provides a mold flux for continuous casting molds 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 premelt A total of 51.5 parts of wollastonite (the mass ratio of premelted material and wollastonite is 30:70), 0.8 parts of lithium carbonate, 5.0 parts of sodium fluoride, 0.5 parts of lightly burned magnesia powder, 2.0 parts of bentonite, and 2.0 parts of cryolite 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 carboxymethylcellulose.

[0087] In terms of mass percentage, 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 O0.31%, B 2 o 3 1.92%, BaO 0.38%, MnO 3.0%, and total C (Ct) 5.8%, and the balanc...

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Abstract

The invention discloses a mold slag specially used for continuous casting molds for sorbite stainless steel and an application thereof, belonging to the technical field of steelmaking auxiliary materials. In terms of mass percentage, the chemical composition of the mold flux includes 23-30% 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% of B 2 o 3 , 0.35-1.6% of BaO, 2.8-5.5% of MnO and 3-6% of Ct, and the balance is unavoidable impurities. This mold powder is suitable for continuous casting of S600E sorbite stainless steel. Its raw material selection and performance index design are reasonable, and it has good lubrication and heat transfer control effects, which can ensure the continuous casting process of sorbite stainless steel and obtain good casting slabs quality.

Description

technical field [0001] The invention relates to the technical field of steelmaking auxiliary materials, in particular to a special continuous casting mold mold slag for sorbite stainless steel and its application. Background technique [0002] In today's steel market, the requirements for long life, high strength, easy welding and acceptable cost of steel structure materials are constantly increasing. Sorbitic stainless steel S600E overcomes the problem of high strength of austenitic stainless steel and ferritic stainless steel; Corrosion 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 its strength is equivalent to the highest level of high-strength anti-seismic steel in Japan ; The corrosion resistance of S600E is 150 times that of conventional carbon steel, and the service life of buildings using this steel can be ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111
CPCB22D11/111B22D11/002C21C7/064C21C7/076
Inventor 杜振宇李晓阳屈党军徐金岩陈永彦王岩马晓娜王希彬
Owner XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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