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High-alkalinity mould flux used for niobium/vanadium/titanium-containing low alloy wide and heavy plate blank and manufacturing method thereof

A technology of mold powder and low alloy, which is applied in the field of auxiliary materials for steelmaking, that is, mold powder, which can solve problems such as stress concentration, increased friction, and deterioration of primary shell cooling and lubrication conditions.

Active Publication Date: 2011-11-23
HENAN TONGYU METALLURGY MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, after the mold slag liquid slag absorbs Al(s), V, Ti, Nb and other metals and their oxides, carbides, and nitrides in molten steel, the viscosity and other characteristics will change greatly, changing the copper plate at the corner of the mold. The heat flux density significantly deteriorates the cooling and lubrication conditions of the primary shell, leading to increased friction and stress concentration, and secondary cooling expansion to produce transverse cracks at the corners
Second, the section of the slab is thick and wide, and the type of steel cast is a medium-carbon alloy steel containing niobium, vanadium, and titanium, which is difficult to cast on the slab continuous casting machine. The solidification shrinkage is large, and the solidification shrinkage is large. When the billet shell is separated from the wall of the crystallizer, the heat flow of the mold is reduced and the heat transfer is uneven, the stress increases, and a depression occurs at the weak point. The local solidification delay of the billet shell will cause longitudinal cracks on the surface. Existence of central segregation aggravation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A high-basicity mold powder for wide-thick slabs containing niobium, vanadium, and titanium low alloys. The ratio of raw materials in weight percentages is: premelted material (its composition and weight percentages are: SiO 2 42~45%, CaO 36~39%, MgO 1.5~3.5%, Fe 2 o 3 Not more than 1%, Al 2 o 3 4~6%,Na 2O 5~7%, F 2~4%) 35~45%, fluorite 11~14%, wollastonite 28~30%, burnt gem 3~6%, limestone 3~6%, sodium carbonate 2~4 %, lithium carbonate 1-3%, manganese carbonate 1-3%, magnesium oxide 2-4%, carbon black 2-4%, graphite 4-7%, binder 1-3%.

[0027] The mass percentage distribution of the chemical components of the mold flux is as follows: CaO 40.94%, SiO 2 27.60%, Li 2 O 1.72%, NaO 4.82%, F - 8.68%,MgO 1.55%,Al 2 o 3 4.12%, Fe 2 o 3 0.93%, MnO 1.62%, solid carbon C 7.08%. Mold flux physical properties: basicity (CaO / SiO 2 ) 1.48, melting point 1165°C, viscosity (1300°C) 0.09Pa·S, melting speed 20 seconds.

Embodiment 2

[0029] A high-basicity mold powder for wide-thick slabs containing niobium, vanadium, and titanium low alloys. The ratio of raw materials in weight percentages is: premelted material (its composition and weight percentages are: SiO 2 42~45%, CaO 36~39%, MgO 1.5~3.5%, Fe 2 o 3 Not more than 1%, Al 2 o 3 4~6%,Na 2 O 5~7%, F 2~4%) 35~45%, fluorite 11~14%, wollastonite 28~30%, burnt gem 3~6%, limestone 3~6%, sodium carbonate 2~4 %, lithium carbonate 1-3%, manganese carbonate 1-3%, magnesium oxide 2-4%, carbon black 2-4%, graphite 4-7%, binder 1-3%.

[0030] The mass percentage distribution of the chemical components of the mold flux is as follows: CaO 37.14%, SiO 2 27.11%, Li 2 O 1.72%, NaO 4.82%, F - 8.68%,MgO 1.55%,Al 2 o 3 4.12%, Fe 2 o 3 0.95%, MnO 1.32%, solid C 8.11%. Mold flux physical properties: basicity (CaO / SiO 2 ) 1.37, melting point 1165°C, viscosity (1300°C) 0.14Pa·S, melting speed 22 seconds.

Embodiment 3

[0032] A high-basicity mold powder for wide-thick slabs containing niobium, vanadium, and titanium low alloys. The ratio of raw materials in weight percentages is: premelted material (its composition and weight percentages are: SiO 2 42~45%, CaO 36~39%, MgO 1.5~3.5%, Fe 2 o 3 Not more than 1%, Al 2 o 3 4~6%,Na 2 O 5~7%, F 2~4%) 35~45%, fluorite 11~14%, wollastonite 28~30%, burnt gem 3~6%, limestone 3~6%, sodium carbonate 2~4 %, lithium carbonate 1-3%, manganese carbonate 1-3%, magnesium oxide 2-4%, carbon black 2-4%, graphite 4-7%, binder 1-3%.

[0033] The mass percentage distribution of the chemical composition of the mold flux is as follows: CaO 41%, SiO 2 25%, MgO 2%, Al 2 o 3 4%, Fe 2 o 3 0.93%, Na 2 O 5.5%, Li 2 O 2%, F - 8%, MnO 2.5%, solid carbon 7%, and the balance is volatile. Mold flux physical properties: basicity (CaO / SiO 2 ) 1.64, melting point 1164°C, viscosity (1300°C) 0.14Pa·S, melting speed 21 seconds.

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Abstract

The invention discloses a high-alkalinity mould flux used for niobium / vanadium / titanium-containing low alloy wide and heavy plate blanks and a manufacturing method thereof. The high-alkalinity mould flux is made from the following raw materials in percentage by weight: 35 to 45 percent of pre-melting materials, 11 to 14 percent of fluorite, 28 to 30 percent of wollastonite, 3 to 6 percent of flint clay, 3 to 6 percent of limestone, 2 to 4 percent of sodium carbonate, 1 to 3 percent of lithium carbonate, 1 to 3 percent of manganese carbonate, 2 to 4 percent of magnesium oxide, 2 to 4 percent of carbon black, 4 to 7 percent of graphite and 1 to 3 percent of binders. The mould flux has a good capability of absorbing Al (s), V, Ti, Nb and other metals and metal oxides or carbides thereof and nitride inclusions in molten steel, and remains unchanged after molten steel purification. Therefore, not only are the performances of the mould flux stable, but also the internal quality of casting blanks is improved.

Description

[0001] technical field [0002] The invention belongs to the technical field of crystallizer mold slag, an auxiliary material for steelmaking, in particular to a high-alkalinity crystallizer mold slag for wide and thick slabs containing niobium, vanadium and titanium low alloys and a manufacturing method thereof. technical background [0003] Vanadium, titanium, and niobium alloys are used as additive elements to form fine carbides and nitrides or carbonitrides in steel, and their particles are pinned at the grain boundaries, which can prevent austenite grains during heating and recrystallization controlled rolling. grain growth and recrystallization of deformed austenite, delay the growth of recrystallized austenite grains, and prevent grain coarsening in the welding heat-affected zone during the welding process, thereby greatly improving its yield strength and toughness, and at the same time It has good cold and hot processing performance and welding performance. Since 1980,...

Claims

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Application Information

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IPC IPC(8): B22D11/111
Inventor 武金波朱云峰唐红波
Owner HENAN TONGYU METALLURGY MATERIALS GRP
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