CN103555892B - New method for controlling alkalinity value of molten alloy steel slag system - Google Patents

New method for controlling alkalinity value of molten alloy steel slag system Download PDF

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CN103555892B
CN103555892B CN201310564730.XA CN201310564730A CN103555892B CN 103555892 B CN103555892 B CN 103555892B CN 201310564730 A CN201310564730 A CN 201310564730A CN 103555892 B CN103555892 B CN 103555892B
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molten steel
slag
ladle
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molten
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CN103555892A (en
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赵福生
刘来君
王明利
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Xi Wang metal Technology Co. Ltd.
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Shandong Xiwang Special Steel Co Ltd
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Abstract

The invention belongs to the technical field of molten steel smelting, and in particular relates to a new method for controlling the alkalinity value of a molten alloy steel slag system. The new method breaks through the conventional train of thought to perform innovation by adjusting the adding time and adding mode of 'pre-melting refining slag' during alloy steel smelting; in a second step, the conventional operations of dehydrogenation and denitrification of molten steel are performed at first, and then pre-melting low-alkalinity refining slag is added to perform a step of pre-evacuation (namely the basic tasks of dehydrogenation and denitrification through vacuumizing are finished at first, then the pre-melting refining slag is added, and a temporary pre-vacuumizing operation on the molten steel is performed again), therefore, the degradation degree of a basic refractory material of a ladle inner wall is greatly reduced, and the basic refractory material involved in the molten steel is further reduced to ensure that impurities of the molten steel are reduced and the molten steel is purer.

Description

Control the novel method of alkalinity value of molten alloy steel slag system
Technical field
The invention belongs to the technical field that molten steel is smelted, be specially a kind of novel method controlling alkalinity value of molten alloy steel slag system.
Background technology
basicityevaluate the index that slag alkalescence is strong and weak.Dephosphorization, desulfurization, remove inclusion and prevent molten steel absorb gas all closely related with slag basicity.Basicity is the important factor affecting the reaction of slag steel.Usually with CaO and SiO in slag 2the ratio of content represents, all character of slag all have substantial connection with its basicity.In production practice, usually work as %CaO/%SiO 2value is less than 1.5 and is called low alkalinity slag, when this value is called medium basic slag between 1.6 ~ 2.5, is called high alkalinity slag when this value is greater than 2.5.
Slag density, lower than molten steel, covers molten steel surface usually.In smelting process, due to the generation of a large amount of gas, there is violent stirring in molten bath, slag and molten steel are often in again mutual admixture, and this degree of mixing is developed more, and the refining effect of slag to molten steel is faster.Due to the successive reaction between slag-steel, component and the character of slag also constantly change in fusion process, and the character of slag is directly connected to the final quality of molten steel, and steel-making industry has a well-known saying: namely steel-making refine slag.Visible slag is to the importance of steel-making.The main task of steel-making is the detrimental impurity (sulphur, phosphorus, gas and inclusion etc.) removed to greatest extent in molten steel, and this mainly relies on the refining effect of slag, therefore will the constantly composition of controlling and adjustment slag and temperature in fusion process.
The fusing point of usual slag is lower than the fusing point of steel, therefore can ensure that slag is in a liquid state at steel-making temperature, and has good mobility and response capacity.High 40 ~ 80 DEG C than molten steel of the actual temperature of slag in stove during smelting.
The temperature of slag and basicity (%CaO/%SiO 2) very big on the impact of its viscosity, in general steelmaking process, the actual temperature of slag is 1600 ~ 1650 DEG C, when basicity is 1.8 ~ 4.2, its viscosity is between 0.03 ~ 0.07Pas, when high alkalinity, along with the reduction of temperature, its viscosity sharply rises, this is that this slag is called short slag owing to separating out dystectic Calucium Silicate powder and the event of calcium oxide from slag.Basicity lower than 0.9 the height of ratio of viscosities basic slag of acid slag, this is because it contains a large amount of heavy ion group (SiO 4) 4-, (si 2o 7) 6-, (Si 6o 18) 12-, but when temperature reduces, viscosity increases steadily, and this slag is called long slag.
In steelmaking process, slag has following function:
(1) remove detrimental impurity element and non-metallic inclusion, reach refining object;
(2) can ensure from furnace gas to molten steel, have certain biography oxygen speed in oxidation period;
(3) N in furnace gas and air can be stoped 2, O 2and H 2to molten steel transmission;
(4) when casting, slag plays thermal insulation function to molten steel in ladle, stops molten steel sharply to be lowered the temperature.
Traditional pro-molten refining slag generally has following two kinds toward feed postition in ladle:
First method is: disposablely all join among the molten steel of LF refining ladle by set pro-molten refining slag quantity, by the strong stirring of the argon gas (having certain pressure) bottom molten steel, make it the multiple basic cpd generation acid-base reaction with molten steel inside, reach the object of smelting pure molten steel among the slag more alkaline species compound in molten steel being generated compound substance floats on molten steel surface.
Shortcoming: due to the quantity comparatively large (needing to add 600 kilograms of pro-molten refining slags in general 80 tons of molten steel) added, the time longer (60 minutes-100 minutes) of both common reactions, slag system basicity span of control is made to be difficult to ensure, simultaneously, the resistance to material of ladle liner alkalescence washes away seriously, in molten steel, inclusion increases, and quality of molten steel declines to a great extent.
Second method is: added at twice by pro-molten refining slag:
The first step, among the molten steel first half (300 kilograms) of set pro-molten refining slag quantity being joined LF refining ladle (80 tons of molten steel), by the argon gas strong stirring of the argon gas gas permeable brick supply certain pressure bottom molten steel, make it the multiple basic cpd generation acid-base reaction with molten steel inside, among slag part alkaline species compound in molten steel being generated compound substance floats on molten steel surface, second step, the ladle filling molten steel after this being added pro-molten refining slag winches to VD vacuum oven, separately remaining set pro-molten refining slag quantity second half (300 kilograms) are joined among the ladle filling molten steel being placed in VD vacuum refining furnace (adding before namely vacuumizing), by the argon gas gas permeable brick supply argon gas strong stirring bottom molten steel, make it the multiple basic cpd generation acid-base reaction with molten steel inside, make in molten steel remaining, the alkaline species compound of the upper secondary response of participation participates in the mutual chemical reaction between acid-base class material again not yet completely, generate compound substance floats on molten steel surface slag among, reach the object of clean molten steel further.
Shortcoming: the pro-molten refining slag that adds of second time under vacuum (be generally 30 minute according to process stipulation) occurs acutely and for a long time to react with the alkaline matter in original basic slag system in steel, in steel, the acid-base reaction time length is long, on the one hand, the alkaline matter of the ladle inner wall made constantly dissolves and enters molten steel, further pollution molten steel, thus cause molten steel slag system basicity value scope control to be difficult to stablize, rangeability is larger, on the other hand, ladle inner wall alkaline matter is washed away repeatedly by acidic substance, reaction and thinning gradually, the probability of aggravation ladle slag line position bleed-out, increase dangerous coefficient of production.If reduce the activity duration of the process stipulation under vacuum condition intentionally, then not reaching the main purpose that molten steel requires thorough dehydrogenation denitrogenation under vacuo, is also infeasible behavior in practice.
For some steel alloys, super clean steel grade, such as, doughnut meridian steel (92A, 72A), prestress wire (82B); The refining of the steel grades such as high-end automobile sulfur-bearing Pinion Steel (20CrMnTiSH), high-end bearing steel (GCr15) all needs the basicity value accurately controlling slag system, could smelt the high-quality steel that mass is superior; But from above-mentioned description, traditional method of refining, in liquid steel refining process, molten steel slag system basicity value scope control is difficult to stablize, rangeability is larger.
Summary of the invention
The object of the invention is to for above-mentioned Problems existing, and a kind of novel method controlling alkalinity value of molten alloy steel slag system is provided.By the novel method not identical with traditional method, letter and easy ground stability contorting molten steel slag system basicity value target, also the various inclusion ability in molten steel of adsorbing of slag in concise ladle is made significantly to improve, reduce the amount of inclusions in molten steel, for quality of molten steel reaches the requirement of purity or ultrapure cleanliness, meet the high quality requirement of high-end customer.
The basic procedure that general steel alloy is smelted is:
Converter or electric furnace (main task: decarburization, dephosphorization)-LF refining furnace (main task: deoxidation, desulfurization)-VD vacuum refining furnace (main task: dehydrogenation, denitrogenation)-continuous caster (main task: liquid molten steel is become solid continuously cast bloom by cooling).
Technical scheme of the present invention is:
Control a novel method for alkalinity value of molten alloy steel slag system, in two steps, it is characterized in that,
The first step: the 40-60% of set pro-molten refining slag weight is joined among the molten steel of LF refining ladle, by the argon gas strong stirring bottom molten steel, make it the multiple basic cpd generation acid-base reaction with molten steel inside, reach the object of smelting pure molten steel among the slag alkaline species compound in molten steel being generated compound substance floats on molten steel surface;
Second step: the ladle after LF refining is winched to VD vacuum oven, carry out the dehydrogenation nitrogen removal step under vacuum condition, after completing dehydrogenating molten steel denitrogenation work, ladle is outputed vacuum tank, the another 40-60% by set pro-molten refining slag weight joins and is placed in VD vacuum refining furnace Z and fills among the ladle of molten steel again, again again drive vacuum tank into, cover vacuum tank lid, carry out the pre-pump step of 3-4 minutes, simultaneously, by the argon gas gas permeable brick supply argon gas strong stirring bottom ladle molten steel, make it the multiple basic cpd generation acid-base reaction with molten steel inside, among the slag making remaining alkaline species compound in molten steel generate further compound substance to float on molten steel surface, thus reach the object of smelting pure molten steel.
As preferably, the novel method of control alkalinity value of molten alloy steel slag system of the present invention, concrete steps are as follows:
The first step: by the 40-60% of set pro-molten refining slag weight, join LF refining furnace and complete among the ladle molten steel of deoxidization desulfuration task, connect argon gas bottom molten steel, argon working pressure is: 0.2-0.4MPa, and the working hour is 30-60 minutes;
Second step: after the first step process terminates, the ladle completed after LF refining task is winched to VD vacuum refining furnace, carry out the dehydrogenation nitrogen removal step under vacuum condition, specifically, the molten steel being placed in ladle and completing deoxidization desulfuration task is carried out vacuumizing operation at vacuum tank, is decremented to gradually from standard 100KPa normal atmosphere under the operating pressure of 67Pa, whole to vacuumize the operation process time be 8-12 minutes, and in vacuum the maintenance vacuum treatment time of 15-20 minutes is continued under 67Pa operating pressure conditions; After completing dehydrogenating molten steel denitrogenation work, ladle is outputed vacuum tank, again the another 40-60% by set pro-molten refining slag weight join be placed in VD vacuum refining furnace the ladle filling molten steel among, again vacuum tank is driven into again, cover vacuum tank lid, carry out the pre-pump step of 3-4 minutes by the argon gas strong stirring bottom molten steel, the vacuum tightness reached is 20-10KPa.
The pre-pump step of 3-4 minute of this second step, can make the fritting low alkalinity refining slag newly added while rapid melting, proceed chemical reaction with the alkaline species compound in molten steel further, reach the object of smelting pure molten steel among the slag making the complex class material that constantly generates floats on molten steel surface.
Described fritting low alkalinity refining slag, its basicity is 0.78, and model is xiwang--82A.Its composition and ratio is as shown in table 1 below:
Table 1 fritting low alkalinity refining slag becomes to be grouped into (%)
As preferably, in a first step, join among the molten steel of LF refining ladle by 50% of set pro-molten refining slag weight, in described set pro-molten refining slag weight and ladle, the weight relationships of molten steel is: pro-molten refining slag weight is 0.375% of the weight of molten steel in ladle.
As preferably, in second step, join 50% of set pro-molten refining slag weight among the ladle filling molten steel being placed in VD vacuum refining furnace.
Innovative point of the present invention to be mainly reflected in when steel alloy is smelted on joining day of " pro-molten refining slag " and feed postition.
Beneficial effect of the present invention is:
The present invention by adjustment when steel alloy is smelted on joining day of " pro-molten refining slag " and feed postition, break conventional thinking, innovate, first carry out conventional steel liquid dehydrogenation denitrogenation work in second step after, add fritting low alkalinity refining slag again to carry out pre-pump step and (namely first complete the basic dehydrogenation vacuumized, denitrogenation task, then add pro-molten refining slag and again carry out carrying out of short duration forvacuum operation to molten steel), operation like this, the basic refractory degradation degree of ladle inner wall can be made significantly to reduce, the basic refractory be involved in molten steel reduces further, molten steel impurity is reduced, molten steel is more pure.
Method of the present invention adopts the novel method not identical with traditional method, facts have proved, according to neoteric method, the behavior reacted with the alkaline matter in original basic slag system in ladle under vacuum due to pro-molten refining slag is comparatively of short duration and strong, the basicity value of molten steel slag system controls more accurate, and its Con trolling index is 0.95-1.05.Steel inclusion quantity significantly reduces, and molten steel is more pure, and inner quality is better, reaches the requirement of purity or ultrapure cleanliness, meets the high quality requirement of high-end customer.
The index of molten steel clean level sees the following form shown in 2.
The index of table 2 molten steel clean level
In a word, method of the present invention, during steel alloy refining, in ladle, the span of control of molten steel slag system basicity value is accurate, convenient and easy compared with traditional method, is easy to promote in practice, and cost is lower, Thinking Creation and unique.
Embodiment
Below by specific embodiment, technical scheme of the present invention is described in detail.
embodiment 1the wire rod steel wire of diameter 6.50mm
Control the novel method of alkalinity value of molten alloy steel slag system, in two steps:
The first step: join among the molten steel of LF refining ladle by 50% of set pro-molten refining slag weight, argon gas is connected bottom molten steel, argon working pressure is: 0.3MPa, and the working hour is 40 minutes, and pro-molten refining slag weight is 0.375% of the weight of molten steel in ladle.
Second step: after the first step process terminates, ladle after LF refining is winched to VD vacuum refining furnace, carry out the dehydrogenation nitrogen removal step under vacuum, specifically, the molten steel put in ladle carries out vacuumizing operation, from the operating pressure gradually to 67Pa standard 100KPa normal atmosphere, 12 minutes whole vacuum time, and under operating pressure conditions, continue the maintenance vacuum treatment time of 20 minutes; After completing dehydrogenating molten steel denitrogenation work, ladle is outputed vacuum tank, again another join 50% of set pro-molten refining slag weight be placed in VD vacuum refining furnace the ladle filling molten steel among, drive vacuum tank into again, cover vacuum tank lid, carry out the pre-pump step of 3 minutes by the argon gas strong stirring bottom molten steel, the vacuum tightness reached is 20KPa.
The pre-pump step of 3 minutes of this second step, can make the fritting low alkalinity refining slag newly added while rapid melting, proceed chemical reaction with the alkaline species compound in molten steel further, reach the object of smelting pure molten steel among the slag making the complex class material that constantly generates floats on molten steel surface.
Described fritting low alkalinity refining slag, its basicity is 0.78, and model is xiwang--82A.Its composition and ratio is as shown in table 3 below:
Table 3 fritting low alkalinity refining slag becomes to be grouped into
In the flow process operation process by the wire rod steel wire drawing of diameter 6.50mm to aimed dia being carefully 0.23mm, altogether elongating distance is 105 myriametres, and middle appearance once ruptures, and Win Clients is spoken highly of.
embodiment 2
Control the novel method of alkalinity value of molten alloy steel slag system, in two steps:
The first step: join among the molten steel of LF refining ladle by 40% of set pro-molten refining slag weight, argon gas is connected bottom molten steel, argon working pressure is: 0.2MPa, and the working hour is 60 minutes, and pro-molten refining slag weight is 0.375% of the weight of molten steel in ladle.
Second step: after the first step process terminates, ladle after LF refining is winched to VD vacuum refining furnace, carry out the dehydrogenation nitrogen removal step under vacuum, specifically, the molten steel put in ladle carries out vacuumizing operation, from the operating pressure gradually to 67Pa standard 100KPa normal atmosphere, 8 minutes whole vacuum time, and under operating pressure conditions, continue the maintenance pumpdown time of 15 minutes; After completing dehydrogenating molten steel denitrogenation work, ladle is outputed vacuum tank, again another join 60% of set pro-molten refining slag weight be placed in VD vacuum refining furnace the ladle filling molten steel among, drive vacuum tank into again, cover vacuum tank lid, carry out the pre-pump step of 4 minutes by the argon gas strong stirring bottom molten steel, the vacuum tightness reached is 15KPa.
The pre-pump step of 4 minutes of this second step, can make the fritting low alkalinity refining slag newly added while rapid melting, proceed chemical reaction with the alkaline species compound in molten steel further, reach the object of smelting pure molten steel among the slag making the complex class material that constantly generates floats on molten steel surface.
Described fritting low alkalinity refining slag is identical with embodiment 1.
embodiment 3
Control the novel method of alkalinity value of molten alloy steel slag system, in two steps:
The first step: join among the molten steel of LF refining ladle by 60% of set pro-molten refining slag weight, argon gas is connected bottom molten steel, argon working pressure is: 0.4MPa, and the working hour is 30 minutes, and pro-molten refining slag weight is 0.375% of the weight of molten steel in ladle.
Second step: after the first step process terminates, ladle after LF refining is winched to VD vacuum refining furnace, carry out the dehydrogenation nitrogen removal step under vacuum, specifically, the molten steel put in ladle carries out vacuumizing operation, from the operating pressure gradually to 67Pa standard 100KPa normal atmosphere, 10 minutes whole vacuum time, and under operating pressure conditions, continue the maintenance vacuum treatment time of 18 minutes; After completing dehydrogenating molten steel denitrogenation work, ladle is outputed vacuum tank, again another join 40% of set pro-molten refining slag weight be placed in VD vacuum refining furnace the ladle filling molten steel among, drive vacuum tank into again, cover vacuum tank lid, carry out the pre-pump step of 3 minutes by the argon gas strong stirring bottom molten steel, the vacuum tightness reached is 20KPa.
The pre-pump step of 3 minutes of this second step, can make the fritting low alkalinity refining slag newly added while rapid melting, proceed chemical reaction with the alkaline species compound in molten steel further, reach the object of smelting pure molten steel among the slag making the complex class material that constantly generates floats on molten steel surface.
Described fritting low alkalinity refining slag is identical with embodiment 1.

Claims (5)

1. control a novel method for alkalinity value of molten alloy steel slag system, in two steps, it is characterized in that,
The first step: the 40-60% of set fritting low alkalinity refining slag weight is joined among the molten steel of LF refining ladle, by the argon gas strong stirring bottom molten steel, make it the multiple basic cpd generation acid-base reaction with molten steel inside, reach the object of smelting pure molten steel among the slag alkaline species compound in molten steel being generated compound substance floats on molten steel surface;
Second step: the ladle after LF refining is winched to VD vacuum oven, carry out the dehydrogenation nitrogen removal step under vacuum condition, after completing dehydrogenating molten steel denitrogenation work, ladle is outputed vacuum tank, the another 40-60% by set fritting low alkalinity refining slag weight joins and is placed in VD vacuum refining furnace and fills among the ladle of molten steel again, again again drive vacuum tank into, cover vacuum tank lid, carry out the pre-pump step of 3-4 minutes, simultaneously, by the argon gas gas permeable brick supply argon gas strong stirring bottom ladle molten steel, make it the multiple basic cpd generation acid-base reaction with molten steel inside, among the slag making remaining alkaline species compound in molten steel generate further compound substance to float on molten steel surface, thus reach the object of smelting pure molten steel.
2. the novel method of control alkalinity value of molten alloy steel slag system according to claim 1, concrete steps are as follows:
The first step: by the 40-60% of set fritting low alkalinity refining slag weight, join LF refining furnace and complete among the ladle molten steel of deoxidization desulfuration task, connect argon gas bottom molten steel, argon working pressure is: 0.2-0.4MPa, and the working hour is 30-60 minutes;
Second step: after the first step process terminates, the ladle completed after LF refining task is winched to VD vacuum refining furnace, carry out the dehydrogenation nitrogen removal step under vacuum condition, specifically, carrying out vacuumizing operation in vacuum tank by putting in ladle the molten steel completing deoxidization desulfuration task, being decremented to gradually from standard 100kPa normal atmosphere under the operating pressure of 67Pa, the whole vacuum time is 8-12 minutes, and in vacuum the maintenance vacuum treatment time of 15-20 minutes is continued under 67Pa operating pressure conditions; After completing the work of dehydrogenating molten steel denitrogenation, ladle is outputed vacuum tank, again the another 40-60% by set fritting low alkalinity refining slag weight join be placed in VD vacuum refining furnace the ladle filling molten steel among, again vacuum tank is driven into again, cover vacuum tank lid, carry out the pre-pump step of 3-4 minutes by the argon gas strong stirring bottom molten steel, the vacuum tightness reached is 20-10kPa.
3. the novel method of control alkalinity value of molten alloy steel slag system according to claim 1, is characterized in that, described fritting low alkalinity refining slag, and its basicity is 0.78, and model is xiwang--82A, and its composition composition and ratio is as shown in table 1 below:
Table 1 fritting low alkalinity refining slag becomes to be grouped into (%)
4. the novel method of control alkalinity value of molten alloy steel slag system according to claim 1 and 2, it is characterized in that, in a first step, join among the molten steel of LF refining ladle by 50% of set fritting low alkalinity refining slag weight, in described set fritting low alkalinity refining slag weight and ladle, the weight relationships of molten steel is: fritting low alkalinity refining slag weight is 0.375% of the weight of molten steel in ladle.
5. the novel method of control alkalinity value of molten alloy steel slag system according to claim 1 and 2, is characterized in that, in second step, joins 50% of set fritting low alkalinity refining slag weight among the ladle filling molten steel being placed in VD vacuum refining furnace.
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JP2009068074A (en) * 2007-09-13 2009-04-02 Sanyo Special Steel Co Ltd Slag-making method in ladle refining for low carbon alloy steel
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