CN107916319B - Refining method of LF furnace in container steel production of CSP production line - Google Patents
Refining method of LF furnace in container steel production of CSP production line Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0025—Adding carbon material
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
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Abstract
A refining method of an LF furnace in container steel production of a CSP production line comprises the following steps: smelting in a converter and then refining in an LF (ladle furnace); adopting one-time heating: carrying out one-time slagging, desulfuration and alloy addition; carrying out calcium treatment; soft blowing for 3-4min, and performing the subsequent steps. The invention adopts the optimized control of one-time heating, one-time slagging, desulfurization and alloy addition in the refining process of the steel-making LF furnace, and can obviously solve the problems of low surface edge crack defect judgment rate, low component qualification rate, frequent cast steel casting interruption and the like of the steel for producing containers on the CSP production line, so that the edge crack defect judgment rate is reduced to be within 1.0 percent, the component qualification rate is improved to be more than 98 percent, and the steel leakage rate is reduced to be within 0.3 percent.
Description
Technical Field
The invention relates to the field of production of container steel, and particularly belongs to a smelting method for producing container steel by CSP short process.
Background
The container steel (SPA-H) itself is a crack sensitive steel. The container steel is produced by the CSP production line, and because the funnel-shaped crystallizer is adopted in the continuous casting of the production line, and the casting blank has the characteristics of high drawing speed, large deformation and the like, the risk of producing the container steel by the CSP process is increased, and the container steel possibly has quality defects of edge cracking and the like. In addition, the internal control qualification rate of steel-making components is low, and the problems that the cast steel is easy to be subjected to the classical drawing qualification rate caused by yellow report and large liquid level fluctuation are serious.
Chinese patent No. 01114640 discloses a method of producing a container board. The conventional process flow for producing the container plate is introduced, namely converter smelting, argon station argon blowing, LF furnace refining, continuous casting and steel rolling, but the problems of improving the component qualification rate, controlling edge crack defect judgment, unstable steel casting and the like in the production of the container steel by a CSP production line cannot be solved well.
In the existing CSP production line steel production technology for producing containers, the rate of judging the surface edge crack defect is higher than 2.2%, the component percent of pass is lower than 96%, and the steel leakage rate is higher than 1.0%.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a refining method of an LF furnace in container steel produced by a CSP production line. By adopting the optimized control of one-time heating, one-time slagging, desulfurization and alloy addition in the refining process of the steel-making LF furnace, the problems of low surface edge crack defect judgment rate, low component qualification rate, frequent cast steel breaking and the like of the steel for producing containers on the CSP production line can be obviously solved, the edge crack defect judgment rate is reduced to be within 1.0%, the component qualification rate is improved to be more than 98%, and the steel leakage rate is reduced to be within 0.3%.
The measures for realizing the aim are as follows:
a refining method of an LF furnace in container steel produced by a CSP production line comprises the following steps:
1) smelting in a converter, then feeding into an LF furnace, and blowing argon at double bottoms, wherein:
blowing argon through the large-tank air brick, wherein the flow of the argon is 1100-1200L/min; after blowing through, adjusting the flow of argon gas to 200-400L/min;
2) adopting one-time heating:
directly raising the temperature to the highest temperature required by the process within 6-10 min; setting the flow of argon in the heating process at 200-400L/min;
3) carrying out one-time slagging, desulfuration and alloy addition:
firstly, slagging and desulfurizing: adjusting the argon flow to 600-800L/min, and then sequentially adding 0.6-1.0 kg of aluminum balls or aluminum wires per ton of steel, 3.0-5.0kg of lime per ton of steel and the addition of refining slag of not more than 0.48kg per ton of steel for 6-10 min;
when slagging and desulfurizing are carried out for 4-5 min, sequentially adding ferrosilicon, ferromanganese, ferrophosphorus, ferrochromium, carbon powder or carbon wires according to set values; after the alloy is added, stirring for 2-3 min;
carrying out soft blowing: adjusting the flow of argon gas to 10-50L/min, and the soft blowing time is 5-8 min;
when the steel is Ti-containing steel, adding a titanium iron wire according to a set value in a soft blowing stage;
when the reaction is finished, the S content is controlled to be less than or equal to 0.006wt%, and the Als content is controlled to be 200-300 ppm;
4) carrying out calcium treatment: feeding a calcium wire according to 0.4-0.6 kg/ton of steel under the condition that the flow of argon is 10-50L/min, and controlling the wire feeding speed to be 3-3.5 m/min; when the calcium content is finished, controlling the calcium content to be 12-22 ppm; controlling other elements within a set range;
5) and after the calcium treatment is finished, soft blowing is carried out for 3-4min, and then the post working procedures are carried out conventionally.
Preferably: in the slagging and desulfurizing stage, calcium carbide with the weight not more than 0.12 kg/ton steel is added.
Preferably: in the step 2), heating for 6-9 min in one-time heating; the flow rate of the argon gas is set to 225-370L/min.
Preferably: adjusting the flow of argon to 630-750L/min when slagging and desulfurizing in the step 3).
Preferably: the argon flow in the soft blowing stage is 16-42L/min.
Mechanism and action of each main process in the invention
In the invention, in the refining of the LF furnace, the temperature is directly raised to the highest temperature required by the process within 6-10 min, because the repeated electric heating of the LF furnace can cause the reductive steel slag produced by the refining to be secondarily oxidized by air during later heating, particularly the components of the container plate steel are more in variety, and the oxides obtained after the secondary oxidation of the alloy elements can destroy the composition of the refined slag system, so that the impurity adsorption capacity of the refined slag system is weakened.
The invention carries out slagging, desulfuration and alloy addition at one time in the refining of the LF furnace, because the container plate steel needs a plurality of alloy element compositions and the carbon content is close to peritectic steel interval, the requirement on the uniformity control of the molten steel composition is particularly high, and the poor uniformity of the molten steel composition at the later stage of the refining of the LF furnace is easily caused by multi-time desulfuration slagging or multi-time alloy adjustment.
It should be noted that when slagging and desulfurizing are carried out in the step 3) of the process of the invention for 4min, the required alloy is adjusted by adding the steel components in sequence at one time, and the following references are made: the elements with weaker reducibility are added according to the control of the lower limit, and the elements with stronger reducibility are added according to the control of the upper limit.
The invention provides one-time electric heating, slagging, desulfurizing and alloying of the LF furnace, so that the edge crack defect rate of the steel for producing the container by the CSP production line is reduced to be within 1.0 percent, the component qualification rate is improved to be more than 98 percent, and the steel leakage rate is reduced to be within 0.3 percent.
Detailed Description
The present invention is described in detail below:
the steel grades of the following embodiments of the invention are all Ti-containing steels, and the component contents (wt%) thereof are all any value within the following ranges: c: 0.04-0.065%, Si: 0.25-0.45%, Mn: 0.42-0.6%, P: 0.07-0.125%, S is less than or equal to 0.15%, Als: 0.015 to 0.06%, Cu: 0.25-0.4%, Cr: 0.3-0.6%, Ni less than or equal to 0.3%, Ti: 0.025-0.06%, N is less than or equal to 0.008, and the balance is Fe and inevitable impurities.
Example 1
A refining method of an LF furnace in container steel production of a CSP production line comprises the following steps:
1) smelting in a converter, then feeding into an LF furnace, and blowing argon at double bottoms, wherein:
blowing argon through the large-tank air brick, wherein the flow of the argon is 1200L/min; after blowing through, the argon flow is adjusted to 400L/min;
2) adopting one-time heating:
heating for 9min, and directly increasing the temperature to 1625 deg.C; the flow rate of argon gas in the heating process is set at 250L/min;
3) carrying out one-time slagging, desulfuration and alloy addition:
firstly, slagging and desulfurizing: adjusting argon flow to 800L/min, adding aluminum pellets of 1.0 kg/ton steel, lime of 5.0 kg/ton steel and refining slag of 0.28 kg/ton steel for 9 min;
after slagging and desulfurizing for 5min, sequentially adding ferrosilicon, ferromanganese, ferrophosphorus, ferrochromium, carbon powder or carbon wire according to set values; after the alloy is added, stirring for 2 min;
carrying out soft blowing: adjusting the argon flow to 10L/min, and the soft blowing time is 5 min;
because the steel is Ti-containing steel, a titanium iron wire is added according to a set value in the soft blowing stage;
when the process is finished, the S content is controlled to be 0.008wt%, and the Als content is controlled to be 201 ppm;
4) carrying out calcium treatment: feeding a calcium wire according to 0.6 kg/ton steel under the condition that the flow of argon is 10L/min, and controlling the wire feeding speed to be 3 m/min; at the end, the calcium content was controlled at 12 ppm.
5) Soft blowing for 3min after the calcium treatment is finished, and then performing the post-procedure conventionally.
According to statistics, the rate of judging edge crack defects in the furnace production is 0.7%, the component percent of pass is more than 100%, and no steel leakage occurs.
Example 2
A refining method of an LF furnace in container steel production of a CSP production line comprises the following steps:
1) smelting in a converter, then feeding into an LF furnace, and blowing argon at double bottoms, wherein:
blowing argon through the large-tank air brick, wherein the flow of the argon is 1200L/min; after blowing through, the argon flow is adjusted to 350L/min;
2) adopting one-time heating:
heating for 8min, and directly increasing the temperature to 1625 deg.C; the argon flow in the heating process is set at 350L/min;
3) carrying out one-time slagging, desulfuration and alloy addition:
firstly, slagging and desulfurizing: adjusting argon flow to 700L/min, adding aluminum pellets 0.8 kg/ton steel, lime 4.0 kg/ton steel and refining slag 0.25 kg/ton steel for 8 min;
after slagging and desulfurizing for 4min, sequentially adding ferrosilicon, ferromanganese, ferrophosphorus, ferrochromium, carbon powder or carbon wire according to set values; after the alloy is added, stirring for 3 min;
carrying out soft blowing: adjusting the argon flow to 20L/min, and the soft blowing time is 6 min;
because the steel is Ti-containing steel, a titanium iron wire is added according to a set value in the soft blowing stage;
at the end, the S content is controlled at 0.006wt%, and the Als content is controlled at 251 ppm;
4) carrying out calcium treatment: feeding a calcium wire according to 0.5 kg/ton steel under the condition that the flow of argon is 20L/min, and controlling the wire feeding speed to be 3 m/min; at the end, the calcium content was controlled at 14 pm.
5) Soft blowing for 4min after the calcium treatment is finished, and then performing the post-procedure conventionally.
According to statistics, the rate of judging edge crack defects in the furnace production is 0.5%, the component percent of pass is more than 100%, and no steel leakage occurs.
Example 3
A refining method of an LF furnace in container steel production of a CSP production line comprises the following steps:
1) smelting in a converter, then feeding into an LF furnace, and blowing argon at double bottoms, wherein:
blowing argon through the large-tank air brick, wherein the flow of the argon is 1200L/min; after blowing through, the argon flow is adjusted to 300L/min;
2) adopting one-time heating:
heating for 9min, and directly increasing the temperature to 1630 deg.C; the flow rate of argon gas in the heating process is set at 300L/min;
3) carrying out one-time slagging, desulfuration and alloy addition:
firstly, slagging and desulfurizing: adjusting argon flow to 600L/min, adding aluminum pellets 0.7 kg/ton steel, lime 4.5 kg/ton steel and refining slag 0.25 kg/ton steel for 8 min;
after slagging and desulfurizing for 5min, sequentially adding ferrosilicon, ferromanganese, ferrophosphorus, ferrochromium, carbon powder or carbon wire according to set values; after the alloy is added, stirring for 3 min;
carrying out soft blowing: adjusting the argon flow to 20L/min, and the soft blowing time is 8 min;
because the steel is Ti-containing steel, a titanium iron wire is added according to a set value in the soft blowing stage;
at the end, the S content was controlled at 0.005wt% and the Als content was controlled at 275 ppm;
4) carrying out calcium treatment: feeding a calcium wire according to 0.5 kg/ton steel under the condition that the flow of argon is 20L/min, and controlling the wire feeding speed to be 3 m/min; at the end, the calcium content was controlled at 16 pm.
5) Soft blowing for 3min after the calcium treatment is finished, and then performing the post-procedure conventionally.
According to statistics, the rate of judging edge crack defects in the furnace production is 0%, the component qualification rate is more than 100%, and no steel leakage occurs.
Example 4
A refining method of an LF furnace in container steel production of a CSP production line comprises the following steps:
1) smelting in a converter, then feeding into an LF furnace, and blowing argon at double bottoms, wherein:
blowing argon through the large-tank air brick, wherein the flow of the argon is 1150L/min; after blowing through, adjusting the argon flow to 250L/min;
2) adopting one-time heating:
heating for 7min, and directly increasing the temperature to 1628 deg.C; the flow rate of argon gas in the heating process is set at 250L/min;
3) carrying out one-time slagging, desulfuration and alloy addition:
firstly, slagging and desulfurizing: adjusting argon flow to 800L/min, adding 0.9kg of aluminum pellets per ton of steel, 5.0kg of lime per ton of steel and 0g of refining slag per ton of steel for 8 min;
after slagging and desulfurizing for 5min, sequentially adding ferrosilicon, ferromanganese, ferrophosphorus, ferrochromium, carbon powder or carbon wire according to set values; after the alloy is added, stirring for 2 min;
carrying out soft blowing: adjusting the argon flow to 16L/min, and the soft blowing time is 5 min;
because the steel is Ti-containing steel, a titanium iron wire is added according to a set value in the soft blowing stage;
at the end, the S content is controlled at 0.006wt%, and the Als content is controlled at 303 ppm;
4) carrying out calcium treatment: feeding a calcium wire according to 0.5 kg/ton steel under the condition that the flow of argon is 16L/min, and controlling the wire feeding speed to be 3 m/min; at the end, the calcium content was controlled at 17 pm.
5) Soft blowing for 3min after the calcium treatment is finished, and then performing the post-procedure conventionally.
According to statistics, the rate of judging edge crack defects in the furnace production is 0.1%, the component percent of pass is more than 100%, and no steel leakage occurs.
Example 5
A refining method of an LF furnace in container steel production of a CSP production line comprises the following steps:
1) smelting in a converter, then feeding into an LF furnace, and blowing argon at double bottoms, wherein:
blowing argon through the large-tank air brick, wherein the flow of the argon is 1200L/min; after blowing through, the argon flow is adjusted to 350L/min;
2) adopting one-time heating:
heating for 9min, and directly increasing the temperature to 1630 deg.C; the argon flow in the heating process is set at 350L/min;
3) carrying out one-time slagging, desulfuration and alloy addition:
firstly, slagging and desulfurizing: adjusting argon flow to 650L/min, adding aluminum pellets 0.8 kg/ton steel, lime 4.5 kg/ton steel and refining slag 0.2 kg/ton steel for 9 min;
after slagging and desulfurizing for 4min, sequentially adding ferrosilicon, ferromanganese, ferrophosphorus, ferrochromium, carbon powder or carbon wire according to set values; after the alloy is added, stirring for 2 min;
carrying out soft blowing: adjusting the argon flow to 18L/min, and the soft blowing time is 8 min;
because the steel is Ti-containing steel, a titanium iron wire is added according to a set value in the soft blowing stage;
at the end, the S content is controlled at 0.004wt%, and the Als content is controlled at 277 ppm;
4) carrying out calcium treatment: feeding a calcium wire according to 0.5 kg/ton of steel under the condition that the argon flow is 18L/min, and controlling the wire feeding speed to be 3 m/min; at the end, the calcium content was controlled at 19 pm.
5) Soft blowing for 3min after the calcium treatment is finished, and then performing the post-procedure conventionally.
According to statistics, the rate of judging edge crack defects in the furnace production is 0%, the component qualification rate is more than 100%, and no steel leakage occurs.
Example 6
A refining method of an LF furnace in container steel production of a CSP production line comprises the following steps:
1) smelting in a converter, then feeding into an LF furnace, and blowing argon at double bottoms, wherein:
blowing argon through the large-tank air brick, wherein the flow of the argon is 1200L/min; after blowing through, adjusting the argon flow to 250L/min;
2) adopting one-time heating:
heating for 9min, and directly increasing the temperature to 1635 deg.C; the argon flow in the heating process is set at 350L/min;
3) carrying out one-time slagging, desulfuration and alloy addition:
firstly, slagging and desulfurizing: adjusting argon flow to 800L/min, adding 0.9kg of aluminum pellets per ton of steel, 5.0kg of lime per ton of steel and 0kg of refining slag per ton of steel for 9 min;
after slagging and desulfurizing for 5min, sequentially adding ferrosilicon, ferromanganese, ferrophosphorus, ferrochromium, carbon powder or carbon wire according to set values; after the alloy is added, stirring for 3 min;
carrying out soft blowing: adjusting the argon flow to 20L/min, and the soft blowing time is 8 min;
because the steel is Ti-containing steel, a titanium iron wire is added according to a set value in the soft blowing stage;
at the end, the S content is controlled at 0.003wt%, and the Als content is controlled at 266 ppm;
4) carrying out calcium treatment: feeding a calcium wire according to 0.4 kg/ton of steel under the condition that the flow of argon is 20L/min, and controlling the wire feeding speed to be 3 m/min; at the end, the calcium content was controlled at 18 pm.
5) Soft blowing for 3min after the calcium treatment is finished, and then performing the post-procedure conventionally.
According to statistics, the rate of judging edge crack defects in the furnace production is 0%, the component qualification rate is more than 100%, and no steel leakage occurs.
The present embodiments are merely preferred examples, and are not intended to limit the scope of the present invention.
Claims (2)
1. A refining method of an LF furnace in container steel produced by a CSP production line comprises the following steps:
1) smelting in a converter, then feeding into an LF furnace, and blowing argon at double bottoms, wherein:
blowing argon through the large-tank air brick, wherein the flow of the argon is 1100-1200L/min; after blowing through, adjusting the flow of argon gas to 200-400L/min;
2) adopting one-time heating:
directly raising the temperature to the highest temperature required by the process within 6-10 min; setting the flow of argon in the heating process at 200-400L/min;
3) carrying out one-time slagging, desulfuration and alloy addition:
firstly, slagging and desulfurizing: adjusting the argon flow to 600-800L/min, and then sequentially adding 0.6-1.0 kg of aluminum balls or aluminum wires per ton of steel, 4.5-5.0kg of lime per ton of steel and the addition of refining slag of not more than 0.48kg per ton of steel for 6-10 min;
when slagging and desulfurizing are carried out for 4-5 min, sequentially adding ferrosilicon, ferromanganese, ferrophosphorus, ferrochromium, carbon powder or carbon wires according to set values; after the alloy is added, stirring for 2-3 min;
carrying out soft blowing: adjusting the flow of argon gas to 10-50L/min, and the soft blowing time is 5-6 min;
when the steel is Ti-containing steel, adding a titanium iron wire according to a set value in a soft blowing stage;
when the reaction is finished, the S content is controlled to be less than or equal to 0.006wt%, and the Als content is controlled to be 200-300 ppm;
4) carrying out calcium treatment: feeding a calcium wire according to 0.4-0.6 kg/ton of steel under the condition that the flow of argon is 10-50L/min, and controlling the wire feeding speed to be 3-3.5 m/min; when the calcium content is finished, controlling the calcium content to be 12-22 ppm, and controlling the rest elements to be within a set range;
5) and after the calcium treatment is finished, soft blowing is carried out for 3-4min, and then the post-working procedure is carried out conventionally.
2. The refining method of the LF furnace in the container steel produced by the CSP production line according to claim 1, characterized in that: adjusting the flow of argon to 630-750L/min when slagging and desulfurizing in the step 3).
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