CN110982983B - Method and device for controlling manganese component in high-strength steel - Google Patents
Method and device for controlling manganese component in high-strength steel Download PDFInfo
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- CN110982983B CN110982983B CN201911279701.2A CN201911279701A CN110982983B CN 110982983 B CN110982983 B CN 110982983B CN 201911279701 A CN201911279701 A CN 201911279701A CN 110982983 B CN110982983 B CN 110982983B
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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
- C21C7/10—Handling in a vacuum
Abstract
The invention provides a method for controlling manganese in high-strength steel, which comprises the following steps: when LF is used for primary refining of molten steel, argon blowing operation is carried out for 3-4 min, 50-150 kg of aluminum particles and 1-1.5 t of synthetic slag are added into the molten steel, and the temperature of the molten steel is controlled to rise by 5-20 ℃ on the basis of the initial temperature; determining the weight of the micro-carbon ferromanganese to be added in the course of the coarse adjustment according to the first target component; determining the weight of the micro-carbon ferromanganese to be added in the primary fine adjustment process according to the second target component and the weight percentage of the manganese component in the molten steel after the primary coarse adjustment process; when RH secondary refining is carried out, determining the weight of the micro-carbon ferromanganese to be added in the secondary coarse adjusting process according to the second target component and the weight percentage of the manganese component in the molten steel after primary fine adjustment; and determining a third target component of the manganese component, and determining the weight of the micro-carbon ferromanganese to be added in the secondary fine adjustment process according to the third target component and the weight percentage of the manganese component in the molten steel after the secondary coarse adjustment.
Description
Technical Field
The invention relates to the technical field of refining processes, in particular to a method and a device for controlling manganese components in high-strength steel.
Background
With the development of automobile industry in China, the demand of users for high-grade automobiles is increasing year by year. At present, the automobile plate and part of parts used by high-grade automobiles are high-strength steel (ultrahigh-strength steel) with over 780 Mpa.
Chemical components are main factors affecting the performance of steel, and in order to improve the strength and toughness of steel, a manganese component is added to molten steel. In the prior art, when high-strength steel above 780Mpa is smelted, the most common smelting method is still used for smelting the high-strength steel, and the manganese component is not strictly controlled, so that the quality of a casting blank cannot reach an ideal state, and further the quality of a product is influenced.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention provides a method and a device for controlling manganese components in high-strength steel, which are used for solving the technical problem that the quality of products is reduced due to unreasonable control of the manganese components when the high-strength steel with the pressure of more than 780MPa is smelted in the prior art.
The embodiment of the invention provides a method for controlling manganese components in high-strength steel, which comprises the following steps:
when the refining furnace LF is used for carrying out primary refining on the molten steel, argon blowing operation is carried out for 3-4 min, 50-150 kg of aluminum particles and 1-1.5 t of synthetic slag are added into the molten steel after the argon blowing is finished, and the temperature of the molten steel is controlled to be increased by 5-20 ℃ on the basis of the initial temperature;
determining a first target component of the manganese component in the primary coarse adjustment process according to the target range of the manganese component, and determining the weight of micro-carbon ferromanganese to be added in the primary coarse adjustment process according to the first target component;
determining a second target component of the manganese component in the primary fine adjustment process according to the target range of the manganese component, and determining the weight of the micro-carbon ferromanganese to be added in the primary fine adjustment process according to the second target component and the weight percentage of the manganese component in the molten steel after the primary coarse adjustment process;
when the molten steel is subjected to RH secondary refining, determining the weight of micro-carbon ferromanganese to be added in the secondary coarse adjusting process according to the second target component and the weight percentage of the manganese component in the molten steel after primary fine adjustment;
and after the secondary coarse adjustment, determining a third target component of the manganese component, and determining the weight of the micro-carbon ferromanganese to be added in the secondary fine adjustment process according to the third target component and the weight percentage of the manganese component in the molten steel after the secondary coarse adjustment.
Optionally, the determining a first target composition of the manganese component in the course of the coarse adjustment according to the target range of the manganese component includes:
acquiring a lower limit value of the target range, and determining the first target component according to the lower limit value and a preset empirical value; the first target component is a difference between the lower limit value and a preset empirical value.
Optionally, the determining a second target component of the manganese component in the primary fine tuning process according to the target range of the manganese component includes:
and acquiring an upper limit value and a lower limit value of the target range, and determining the second target component according to the upper limit value and the lower limit value, wherein the second target component is an average value of the upper limit value and the lower limit value.
Optionally, the determining, according to the target range of the manganese component, a first target component of the manganese component in the primary coarse adjustment process, and after determining, according to the first target component, the weight of the micro-carbon ferromanganese to be added in the primary coarse adjustment process, includes:
adding micro-carbon ferromanganese with corresponding weight into the molten steel, stirring for 3-5 min, and controlling the temperature of the molten steel to rise by 20-50 ℃.
Optionally, the determining a third target composition of manganese composition comprises:
obtaining a fourth difference value between the weight percentage of the manganese component in the molten steel after the secondary coarse adjustment and the second target component, wherein if the fourth difference value is a negative value, the third target component is a sum value between the second target component and the absolute value of the fourth difference value;
if the fourth difference is a positive value, the third target component is a difference between the second target component and the absolute value of the fourth difference.
Optionally, the synthetic slag comprises: fluorite, bauxite, and lime; wherein the weight ratio of the fluorite to the bauxite to the lime is 2:7: 11.
The embodiment of the invention also provides a control device for manganese components in high-strength steel, which comprises:
the control unit is used for carrying out argon blowing operation for 3-4 min when the molten steel is refined by the refining furnace LF for the first time, adding 50-150 kg of aluminum particles and 1-1.5 t of synthetic slag into the molten steel after the argon blowing is finished, and controlling the temperature of the molten steel to rise to 5-20 ℃ on the basis of the initial temperature;
the first determining unit is used for determining a first target component of the manganese component in the primary coarse adjustment process according to the target range of the manganese component and determining the weight of micro-carbon ferromanganese to be added in the primary coarse adjustment process according to the first target component;
determining a second target component of the manganese component in the primary fine adjustment process according to the target range of the manganese component, and determining the weight of the micro-carbon ferromanganese to be added in the primary fine adjustment process according to the second target component and the weight percentage of the manganese component in the molten steel after the primary coarse adjustment process;
the second determining unit is used for determining the weight of micro-carbon ferromanganese to be added in the secondary coarse adjustment process according to the second target component and the weight percentage of the manganese component in the molten steel after primary fine adjustment when the molten steel is subjected to RH secondary refining;
and after the secondary coarse adjustment, determining a third target component of the manganese component, and determining the weight of the micro-carbon ferromanganese to be added in the secondary fine adjustment process according to the third target component and the weight percentage of the manganese component in the molten steel after the secondary coarse adjustment.
Optionally, the first determining unit is specifically configured to:
acquiring a lower limit value of the target range, and determining the first target component according to the lower limit value and a preset empirical value; the first target component is a difference between the lower limit value and a preset empirical value.
Optionally, the first determining unit is further specifically configured to: and acquiring an upper limit value and a lower limit value of the target range, and determining the second target component according to the upper limit value and the lower limit value, wherein the second target component is an average value of the upper limit value and the lower limit value.
Optionally, the control unit is further configured to:
determining a first target component of the manganese component in the primary coarse adjustment process according to the target range of the manganese component, adding the micro-carbon ferromanganese into the molten steel after determining the weight of the micro-carbon ferromanganese to be added in the primary coarse adjustment process according to the first target component, stirring for 3-5 min, and controlling the temperature of the molten steel to rise by 20-50 ℃.
The invention provides a method and a device for controlling manganese components in high-strength steel, wherein the method comprises the following steps: when the refining furnace LF is used for carrying out primary refining on the molten steel, argon blowing operation is carried out for 3-4 min, 50-150 kg of aluminum particles and 1-1.5 t of synthetic slag are added into the molten steel after the argon blowing is finished, and the temperature of the molten steel is controlled to be increased by 5-20 ℃ on the basis of the initial temperature; determining a first target component of the manganese component in the primary coarse adjustment process according to the target range of the manganese component, and determining the weight of micro-carbon ferromanganese to be added in the primary coarse adjustment process according to the first target component; determining a second target component of the manganese component in the primary fine adjustment process according to the target range of the manganese component, and determining the weight of the micro-carbon ferromanganese to be added in the primary fine adjustment process according to the second target component and the weight percentage of the manganese component in the molten steel after the primary coarse adjustment process; when the molten steel is subjected to RH secondary refining, determining the weight of micro-carbon ferromanganese to be added in the secondary coarse adjusting process according to the second target component and the weight percentage of the manganese component in the molten steel after primary fine adjustment; after the secondary coarse adjustment, determining a third target component of the manganese component, and determining the weight of micro-carbon ferromanganese to be added in the secondary fine adjustment process according to the third target component and the weight percentage of the manganese component in the molten steel after the secondary coarse adjustment; therefore, the first target component and the second target component are determined according to the target range of the manganese component, and the target range of the original manganese component is equivalently controlled in a narrow component mode, so that the manganese component can be controlled in a more reasonable range, and the quality of the steel product is further ensured.
Drawings
FIG. 1 is a schematic flow chart of a method for controlling manganese content in high-strength steel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a control device for manganese content in high-strength steel according to an embodiment of the present invention.
Detailed Description
Aiming at solving the technical problem that the quality of the product is reduced due to unreasonable control of manganese component when the high-strength steel with the pressure of more than 780MPa is smelted in the prior art. The invention provides a method and a device for controlling manganese components in high-strength steel, wherein the method comprises the following steps: when the refining furnace LF is used for carrying out primary refining on the molten steel, argon blowing operation is carried out for 3-4 min, 50-150 kg of aluminum particles and 1-1.5 t of synthetic slag are added into the molten steel after the argon blowing is finished, and the temperature of the molten steel is controlled to be increased by 5-20 ℃ on the basis of the initial temperature; determining a first target component of the manganese component in the primary coarse adjustment process according to the target range of the manganese component, and determining the weight of micro-carbon ferromanganese to be added in the primary coarse adjustment process according to the first target component; determining a second target component of the manganese component in the primary fine adjustment process according to the target range of the manganese component, and determining the weight of the micro-carbon ferromanganese to be added in the primary fine adjustment process according to the second target component and the weight percentage of the manganese component in the molten steel after the primary coarse adjustment process; when the molten steel is subjected to RH secondary refining, determining the weight of micro-carbon ferromanganese to be added in the secondary coarse adjusting process according to the second target component and the weight percentage of the manganese component in the molten steel after primary fine adjustment; and after the secondary coarse adjustment, determining a third target component of the manganese component, and determining the weight of the micro-carbon ferromanganese to be added in the secondary fine adjustment process according to the third target component and the weight percentage of the manganese component in the molten steel after the secondary coarse adjustment.
The technical solution of the present invention is further described in detail by the accompanying drawings and the specific embodiments.
Example one
The embodiment provides a method for controlling manganese content in high-strength steel, as shown in fig. 1, the method includes:
s110, carrying out argon blowing operation for 3-4 min when the molten steel is refined by using a refining furnace LF for the first time, adding 50-150 kg of aluminum particles and 1-1.5 t of synthetic slag into the molten steel after the argon blowing is finished, and controlling the temperature of the molten steel to rise to 5-20 ℃ on the basis of the initial temperature;
in the embodiment, high-strength steel with the pressure of more than 780Mpa is smelted mainly in a duplex mode, molten steel smelted by a converter is subjected to deep desulfurization and initial alloy adjustment by a refining furnace LF (ladle furnace), then is transferred to a station, enters an RH refining process for fine alloy adjustment and temperature adjustment, and finally enters a casting machine for casting. Then, in this embodiment, the manganese component is controlled in the LF refining process and the RH refining process.
When the refining furnace LF is used for refining molten steel for the first time, argon blowing operation is carried out on the molten steel, the argon blowing time is controlled to be 3-4 min, and the flow is controlled to be 1200-1250 NL/min.
After argon blowing is finished, adding 50-150 kg of aluminum particles and 1-1.5 t of synthetic slag into the molten steel, then heating the molten steel, and controlling the temperature of the molten steel to be raised to 5-20 ℃ on the basis of the initial temperature; wherein the synthetic slag comprises: fluorite, bauxite, and lime; the weight ratio of fluorite, bauxite and lime is 2:7: 11.
S111, determining a first target component of the manganese component in the primary coarse adjustment process according to the target range of the manganese component, and determining the weight of micro-carbon ferromanganese to be added in the primary coarse adjustment process according to the first target component;
then determining a first target component of the manganese component in the primary coarse adjustment process according to the target range of the manganese component, and determining the weight of the micro-carbon ferromanganese to be added in the primary coarse adjustment process according to the first target component; the concrete implementation is as follows:
acquiring a lower limit value of the target range, and determining the first target component according to the lower limit value and a preset empirical value; the first target component is a difference between the lower limit value and a preset empirical value. The predetermined empirical value is typically 100 ppm.
For example, if the target range of the manganese component is 0.075-0.085%, and the lower limit value is 0.075%, the first target component is 0.065%.
After the first target component is determined, determining the weight of the micro-carbon ferromanganese to be added in the course of coarse adjustment according to the initial weight percentage of the manganese component in the molten steel and the first target component, and specifically comprising the following steps:
and acquiring a first difference between the initial weight percentage of the manganese component in the molten steel and the first target component, and searching the corresponding weight of the micro-carbon ferromanganese in a preset mapping table according to the first difference. Here, the map pre-stores the increment of the manganese content in the molten steel after adding the micro-ferro-manganese carbon with different weights into the molten steel.
For example, before the first coarse adjustment, if the first difference between the initial weight percentage and the first target component is 0.040%, the weight of the micro-carbon ferromanganese corresponding to the first difference is found in the mapping table to be 100kg, and the weight of the micro-carbon ferromanganese added in the process of the first coarse adjustment is 100 kg.
Here, determining a first target component of the manganese component in the primary coarse adjustment process according to the target range of the manganese component, and determining the weight of the micro-carbon ferromanganese to be added in the primary coarse adjustment process according to the first target component includes:
adding the micro-carbon ferromanganese with the corresponding weight into molten steel, stirring for 3-5 min, and controlling the temperature of the molten steel to rise by 20-50 ℃ on the basis of the current temperature.
S112, determining a second target component of the manganese component in the primary fine adjustment process according to the target range of the manganese component, and determining the weight of the micro-carbon ferromanganese to be added in the primary fine adjustment process according to the second target component and the weight percentage of the manganese component in the molten steel after the primary coarse adjustment process;
and after the primary coarse adjustment, performing primary fine adjustment on the heated molten steel, before the primary fine adjustment, determining a second target component of the manganese component in the primary fine adjustment process according to the target range of the manganese component, and determining the weight of the micro-carbon ferromanganese to be added in the primary fine adjustment process according to the second target component and the weight percentage of the manganese component in the molten steel after the primary coarse adjustment process.
As an alternative embodiment, the determining a second target composition of the manganese component in the fine adjustment process according to the target range of the manganese component includes:
and acquiring an upper limit value and a lower limit value of the target range, and determining the second target component according to the upper limit value and the lower limit value, wherein the second target component is an average value of the upper limit value and the lower limit value.
For example, if the target range of the manganese component is 0.075-0.085%, and the lower limit is 0.075%, the second target component is 0.080%.
Similarly, when determining the weight of the micro-carbon ferromanganese to be added in the primary fine adjustment process according to the second target component and the weight percentage of the manganese component in the molten steel after the primary coarse adjustment process, the method specifically comprises the following steps:
and acquiring a second difference value between a second target component and the weight percentage of the manganese component in the molten steel after the primary coarse adjustment process, and searching the corresponding weight of the micro-carbon ferromanganese in the mapping table according to the second difference value.
For example, if the second difference between the weight percentage of the manganese component after the first coarse adjustment and the second target component is 0.065%, the weight of the micro-carbon ferromanganese corresponding to the second difference is found in the mapping table to be 60kg, and the weight of the micro-carbon ferromanganese added in the first fine adjustment process is 60 kg.
S113, when the molten steel is subjected to RH secondary refining, determining the weight of micro-carbon ferromanganese to be added in the secondary coarse adjustment process according to the second target component and the weight percentage of the manganese component in the molten steel after primary fine adjustment;
and after the primary fine adjustment is finished, the manganese component in the molten steel is continuously subjected to fine adjustment in the RH secondary refining process. Before RH secondary refining is carried out on the molten steel, the type of the last batch of feeding of the RH furnace needs to be obtained, if the last batch of feeding is carbon powder, the feeding channel of the RH furnace needs to be smashed by waste steel, residual carbon powder is cleaned, and vacuum treatment is carried out for 3-5 min. Wherein. The scrap is scrap other than scrap from washing belts.
When the molten steel is subjected to RH secondary refining, the weight of the micro-carbon ferromanganese to be added in the secondary coarse-adjusting process is determined according to the second target component and the weight percentage of the manganese component in the molten steel after primary fine-adjusting, and the method specifically comprises the following steps:
and after the primary fine adjustment is finished, circulating the molten steel in the RH furnace for 3min to obtain a third difference value between the second target component and the weight percentage of the manganese component in the molten steel after the primary fine adjustment, and searching the weight of the micro-carbon ferromanganese corresponding to the third difference value in a mapping table.
For example, if the third difference is 0.070%, the weight of the micro-carbon ferromanganese needed to be added is found in the mapping table to be 40 kg.
S114, after the secondary coarse adjustment, determining a third target component of the manganese component, and determining the weight of micro-carbon ferromanganese to be added in the secondary fine adjustment process according to the second target component and the weight percentage of the manganese component in the molten steel after the secondary coarse adjustment;
and after the secondary coarse adjustment, circulating the molten steel for 3-5 min to obtain the weight percentage of the manganese component in the molten steel after the secondary coarse adjustment, determining a third target component of the manganese component according to the second target component and the weight percentage of the manganese component in the molten steel after the secondary coarse adjustment, and determining the weight of micro-carbon ferromanganese to be added in the secondary fine adjustment process according to the third target component and the weight percentage of the manganese component in the molten steel after the secondary coarse adjustment. Wherein the third target component is a final control target of the manganese component.
Before determining the weight of micro-carbon ferromanganese to be added in the secondary fine adjustment process according to the second target component and the weight percentage of the manganese component in the molten steel after the secondary coarse adjustment, the method comprises the following steps:
and acquiring a fourth difference value between the weight percentage of the manganese component in the molten steel after the secondary coarse adjustment and the second target component, wherein if the fourth difference value is a negative number, the burning loss phenomenon exists in the molten steel smelting process, and at the moment, the third target component of the manganese component is the sum of the second target component and the absolute value of the fourth difference value.
If the fourth difference is positive, the Mn return phenomenon exists in the molten steel smelting process, and the third target component of the manganese component is the difference between the second target component and the absolute value of the fourth difference.
For example, if the weight percentage of the manganese component in the molten steel after the second rough adjustment is 1.78% and the second target component is 1.8%, the fourth difference is-0.02%, and the third target component of the manganese component is controlled to be 1.82%.
If the weight percentage of the manganese component in the molten steel after the second rough adjustment is 1.81% and the second target component is 1.8%, the fourth difference is 0.01%, and the third target component of the manganese component is controlled according to 1.80%.
After alloying is completed in the RH refining process, pure circulation is carried out for 6-8 min, so that the uniformity of each component in molten steel is ensured, and meanwhile, impurities are prevented from floating upwards. The net cycle time is the time between the last batch in the RH furnace to the end of the RH refining.
Therefore, the manganese component is roughly adjusted and finely adjusted for the first time in the LF furnace and roughly adjusted for the second time in the RH furnace, and the secondary fine adjustment can ensure that the content of the manganese component is more reasonable, so that the quality of the product can be ensured.
In the RH refining of molten steel, it is necessary to ensure that the degree of vacuum in the RH-deep vacuum-killed state is less than 200 Pa.
Based on the same inventive concept, the invention also provides a control device for the manganese component in the high-strength steel, which is detailed in the second embodiment.
Example two
This embodiment provides a control device for manganese component in high-strength steel, as shown in fig. 2, the device includes: a control unit 21, a first determination unit 22, and a second determination unit 23; wherein the content of the first and second substances,
in the embodiment, high-strength steel with the pressure of more than 780Mpa is smelted mainly in a duplex mode, molten steel smelted by a converter is subjected to deep desulfurization and initial alloy adjustment by a refining furnace LF (ladle furnace), then is transferred to a station, enters an RH refining process for fine alloy adjustment and temperature adjustment, and finally enters a casting machine for casting. Then, in this embodiment, the manganese component is controlled in the LF refining process and the RH refining process.
When the refining furnace LF is used for refining molten steel for the first time, the control unit 21 is used for blowing argon into the molten steel, the argon blowing time is controlled to be 3-4 min, and the flow rate is controlled to be 1200-1250 NL/min.
After argon blowing is finished, adding 50-150 kg of aluminum particles and 1-1.5 t of synthetic slag into the molten steel, then heating the molten steel, and controlling the temperature of the molten steel to be raised to 5-20 ℃ on the basis of the initial temperature; wherein the synthetic slag comprises: fluorite, bauxite, and lime; the weight ratio of fluorite, bauxite and lime is 2:7: 11.
Then, the first determining unit 22 determines a first target component of the manganese component in the primary coarse adjustment process according to the target range of the manganese component, and determines the weight of the micro-carbon ferromanganese to be added in the primary coarse adjustment process according to the first target component; the concrete implementation is as follows:
acquiring a lower limit value of the target range, and determining the first target component according to the lower limit value and a preset empirical value; the first target component is a difference between the lower limit value and a preset empirical value. The predetermined empirical value is typically 100 ppm.
For example, if the target range of the manganese component is 0.075-0.085%, and the lower limit value is 0.075%, the first target component is 0.065%.
After the first target component is determined, determining the weight of the micro-carbon ferromanganese to be added in the course of coarse adjustment according to the initial weight percentage of the manganese component in the molten steel and the first target component, and specifically comprising the following steps:
and acquiring a first difference between the initial weight percentage of the manganese component in the molten steel and the first target component, and searching the corresponding weight of the micro-carbon ferromanganese in a preset mapping table according to the first difference. Here, the map pre-stores the increment of the manganese content in the molten steel after adding the micro-ferro-manganese carbon with different weights into the molten steel.
For example, before the first coarse adjustment, if the first difference between the initial weight percentage and the first target component is 0.040%, the weight of the micro-carbon ferromanganese corresponding to the first difference is found in the mapping table to be 100kg, and the weight of the micro-carbon ferromanganese added in the process of the first coarse adjustment is 100 kg.
Here, after determining a first target component of the manganese component in the primary coarse adjustment process according to the target range of the manganese component, and determining the weight of the micro-carbon ferromanganese to be added in the primary coarse adjustment process according to the first target component, the control unit 21 is further configured to:
adding the micro-carbon ferromanganese with the corresponding weight into molten steel, stirring for 3-5 min, and controlling the current temperature of the molten steel to rise by 20-50 ℃.
And after the primary coarse adjustment, performing primary fine adjustment on the heated molten steel, wherein before the primary fine adjustment, the first determining unit 22 is further configured to determine a second target component of the manganese component in the primary fine adjustment process according to the target range of the manganese component, and determine the weight of the micro-carbon ferromanganese to be added in the primary fine adjustment process according to the second target component and the weight percentage of the manganese component in the molten steel after the primary coarse adjustment process.
As an alternative embodiment, the first determination unit 22 determines the second target composition of the manganese component in the fine adjustment process according to the target range of the manganese component, and includes:
and acquiring an upper limit value and a lower limit value of the target range, and determining the second target component according to the upper limit value and the lower limit value, wherein the second target component is an average value of the upper limit value and the lower limit value.
For example, if the target range of the manganese component is 0.075-0.085%, and the lower limit is 0.075%, the second target component is 0.080%.
Similarly, when the first determining unit 22 determines the weight of the micro-carbon ferromanganese to be added in the primary fine adjustment process according to the second target component and the weight percentage of the manganese component in the molten steel after the primary coarse adjustment process, the method specifically includes:
and acquiring a second difference value between a second target component and the weight percentage of the manganese component in the molten steel after the primary coarse adjustment process, and searching the corresponding weight of the micro-carbon ferromanganese in the mapping table according to the second difference value.
For example, if the second difference between the weight percentage of the manganese component after the first coarse adjustment and the second target component is 0.065%, the weight of the micro-carbon ferromanganese corresponding to the second difference is found in the mapping table to be 60kg, and the weight of the micro-carbon ferromanganese added in the first fine adjustment process is 60 kg.
And after the primary fine adjustment is finished, the manganese component in the molten steel is continuously subjected to fine adjustment in the RH secondary refining process. Before RH secondary refining is carried out on the molten steel, the type of the last batch of feeding of the RH furnace needs to be obtained, if the last batch of feeding is carbon powder, the feeding channel of the RH furnace needs to be smashed by waste steel, residual carbon powder is cleaned, and vacuum treatment is carried out for 3-5 min. Wherein. The scrap is scrap other than scrap from washing belts.
When the molten steel is subjected to RH secondary refining, the second determining unit 23 determines the weight of the micro-carbon ferromanganese to be added in the secondary coarse adjustment process according to the second target component and the weight percentage of the manganese component in the molten steel after the primary fine adjustment, and specifically includes:
and after the first fine adjustment is finished, obtaining a third difference value between the second target component and the weight percentage of the manganese component in the molten steel after the first fine adjustment, and searching the weight of the micro-carbon ferromanganese corresponding to the third difference value in a mapping table.
For example, if the third difference is 0.070%, the weight of the micro-carbon ferromanganese needed to be added is found in the mapping table to be 40 kg.
After the second coarse adjustment, circulating the molten steel for 3-5 min to obtain the weight percentage of the manganese component in the molten steel after the second coarse adjustment, determining a third target component of the manganese component according to the second target component and the weight percentage of the manganese component in the molten steel after the second coarse adjustment, and determining the weight of the micro-carbon ferromanganese to be added in the second fine adjustment process according to the third target component and the weight percentage of the manganese component in the molten steel after the second coarse adjustment. Wherein the third target component is a final control target of the manganese component.
Here, before determining the weight of the micro-carbon ferromanganese to be added in the secondary fine adjustment process according to the second target component and the weight percentage of the manganese component in the molten steel after the secondary coarse adjustment, the second determining unit 23 is specifically configured to:
and obtaining a fourth difference value between the weight percentage of the manganese component in the molten steel after the secondary coarse adjustment and the second target component, wherein if the fourth difference value is a negative number, the burning loss phenomenon exists in the molten steel smelting process, and at the moment, the third target component of the manganese component is a sum value between the second target component and the absolute value of the fourth difference value.
If the fourth difference is positive, the Mn return phenomenon exists in the molten steel smelting process, and the third target component of the manganese component is the difference between the second target component and the absolute value of the fourth difference.
For example, if the weight percentage of the manganese component in the molten steel after the second rough adjustment is 1.78% and the second target component is 1.8%, the fourth difference is-0.02%, and the third target component of the manganese component is controlled to be 1.82%.
If the weight percentage of the manganese component in the molten steel after the second rough adjustment is 1.81% and the second target component is 1.8%, the fourth difference is 0.01%, and the third target component of the manganese component is controlled to be 1.80%.
After alloying is completed in the RH refining process, pure circulation is carried out for 6-8 min, so that the uniformity of each component in molten steel is ensured, and meanwhile, impurities are prevented from floating upwards. The net cycle time is the time between the last batch in the RH furnace to the end of the RH refining.
Therefore, the manganese component is roughly adjusted and finely adjusted for the first time in the LF furnace, and is roughly adjusted for the second time in the RH furnace, and the fine adjustment for the second time can ensure that the content of the manganese component is more reasonable, so that the quality of the product can be ensured.
EXAMPLE III
In practical application, when the manganese component of a certain high-strength steel is controlled, the following effects are achieved:
when the refining furnace LF is used for refining the molten steel for the first time, argon blowing operation is carried out on the molten steel, the argon blowing time is controlled to be 3min, and the flow is controlled to be 1200 NL/min. After argon blowing is finished, 133kg of aluminum particles and 1.5t of synthetic slag are added into the molten steel, then the molten steel is heated up, and the temperature of the molten steel is controlled to be raised to 15 ℃ on the basis of the initial temperature; wherein the synthetic slag comprises: fluorite, bauxite, and lime; the weight ratio of fluorite, bauxite and lime is 2:7: 11.
Since the target range of the manganese component of this steel grade is 1.75 to 1.85%, the first target component is 1.74% and the second target component is 1.80%. The initial weight percentage of the manganese component was 1.5722%.
In the course of one coarse adjustment, the first difference between the initial weight percentage and the first target component is 0.06%, and then the weight of the micro-carbon ferromanganese corresponding to the first difference is found in the mapping table to be 680kg, and then the weight of the micro-carbon ferromanganese added in the course of one coarse adjustment is 680 kg.
Adding 680kg of micro-carbon ferromanganese into molten steel, stirring for 3-5 min, and controlling the current temperature of the molten steel to rise by 40 ℃.
After the coarse adjustment, the fine adjustment is performed on the heated molten steel. The weight percentage of the manganese component in the molten steel after the first coarse adjustment is 1.746%, a second difference value between the second target component and the weight percentage of the manganese component in the molten steel after the first coarse adjustment is 0.054%, the weight of the micro-carbon ferromanganese corresponding to the second difference value is found in a mapping table to be 216kg, and the weight of the micro-carbon ferromanganese added in the first fine adjustment is 216 kg.
When the molten steel is subjected to RH secondary refining, after the molten steel circulates in an RH furnace for 3min, the weight percentage of the manganese component in the molten steel after primary fine adjustment is obtained, specifically 1.78%, the second target component is 1.80%, and the third difference between the second target component and the weight percentage of the manganese component in the molten steel after primary fine adjustment is 0.02%, so that the weight of the micro-carbon ferromanganese needing to be added is found to be 80kg in the mapping table. Therefore, 80kg of micro-carbon ferromanganese is added into the molten steel in the secondary coarse adjustment process.
And (3) after 80kg of micro-carbon ferromanganese is added into the molten steel, circulating the molten steel in an RH furnace for 3-5 min to obtain the weight percentage of the manganese component in the molten steel after the secondary coarse adjustment, specifically 1.78%, wherein the determined third target component is-0.02%, which indicates that the burning loss phenomenon exists in the molten steel smelting process, and the third target component of the manganese component is the sum of the second target component and the absolute value of the fourth difference, namely the third target component is 1.82%.
Then the fifth difference between the third target component and the weight percentage of the manganese component in the molten steel after the second coarse adjustment is 0.04%, and then the weight of the microcarbon ferromanganese needing to be added is found to be 160kg in the mapping table. Therefore, 160kg of micro-carbon ferromanganese is added into the molten steel in the secondary fine adjustment process.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.
Claims (5)
1. A method for controlling manganese content in high-strength steel is characterized by comprising the following steps:
when the refining furnace LF is used for carrying out primary refining on the molten steel, argon blowing operation is carried out for 3-4 min, 50-150 kg of aluminum particles and 1-1.5 t of synthetic slag are added into the molten steel after the argon blowing is finished, and the temperature of the molten steel is controlled to be increased by 5-20 ℃ on the basis of the initial temperature;
determining a first target component of the manganese component in the primary coarse adjustment process according to the target range of the manganese component, and determining the weight of micro-carbon ferromanganese to be added in the primary coarse adjustment process according to the first target component, wherein the method comprises the following steps:
acquiring a lower limit value of the target range, and determining the first target component according to the lower limit value and a preset empirical value; the first target component is a difference value between the lower limit value and a preset empirical value;
acquiring a first difference between the initial weight percentage of the manganese component in the molten steel and the first target component, and searching the corresponding weight of the micro-carbon ferromanganese in a preset mapping table according to the first difference; wherein the preset empirical value is 100 ppm;
determining a second target component of the manganese component in the primary fine adjustment process according to the target range of the manganese component, and determining the weight of the micro-carbon ferromanganese to be added in the primary fine adjustment process according to the second target component and the weight percentage of the manganese component in the molten steel after the primary coarse adjustment process, wherein the method comprises the following steps:
acquiring an upper limit value and a lower limit value of the target range, and determining the second target component according to the upper limit value and the lower limit value, wherein the second target component is an average value of the upper limit value and the lower limit value;
acquiring a second difference value between the second target component and the weight percentage of the manganese component in the molten steel after the primary coarse adjustment process, and searching the corresponding weight of the micro-carbon ferromanganese in the mapping table according to the second difference value;
when the molten steel is subjected to RH secondary refining, the weight of the micro-carbon ferromanganese to be added in the secondary coarse adjusting process is determined according to the second target component and the weight percentage of the manganese component in the molten steel after primary fine adjustment, and the method comprises the following steps:
obtaining a third difference value between the second target component and the weight percentage of the manganese component in the molten steel after the first fine adjustment, and searching the weight of the micro-carbon ferromanganese corresponding to the third difference value in the mapping table;
after the second coarse adjustment, determining a third target component of the manganese component, including: obtaining a fourth difference value between the weight percentage of the manganese component in the molten steel after the secondary coarse adjustment and the second target component, wherein if the fourth difference value is a negative value, the third target component is a sum value between the second target component and the absolute value of the fourth difference value;
if the fourth difference is a positive value, the third target component is the difference between the second target component and the absolute value of the fourth difference;
and determining the weight of the micro-carbon ferromanganese to be added in the secondary fine adjustment process according to the third target component and the weight percentage of the manganese component in the molten steel after the secondary coarse adjustment.
2. The method of claim 1, wherein the determining a first target component of the manganese component in the course of the coarse adjustment according to the target range of the manganese component comprises:
adding micro-carbon ferromanganese with corresponding weight into the molten steel, stirring for 3-5 min, and controlling the temperature of the molten steel to rise by 20-50 ℃.
3. The method of claim 1, wherein the synthetic slag comprises: fluorite, bauxite, and lime; wherein the weight ratio of the fluorite to the bauxite to the lime is 2:7: 11.
4. A control apparatus for manganese content in high strength steel, the apparatus comprising:
the control unit is used for performing argon blowing operation for 3-4 min when the molten steel is refined by using the refining furnace LF for the first time, adding 50-150 kg of aluminum particles and 1-1.5 t of synthetic slag into the molten steel after the argon blowing operation is finished, and controlling the temperature of the molten steel to rise by 5-20 ℃ on the basis of the initial temperature;
the first determining unit is used for determining a first target component of the manganese component in the primary coarse adjustment process according to the target range of the manganese component, and determining the weight of micro-carbon ferromanganese to be added in the primary coarse adjustment process according to the first target component, and comprises the following steps:
acquiring a lower limit value of the target range, and determining the first target component according to the lower limit value and a preset empirical value; the first target component is a difference value between the lower limit value and a preset empirical value;
acquiring a first difference between the initial weight percentage of the manganese component in the molten steel and the first target component, and searching the corresponding weight of the micro-carbon ferromanganese in a preset mapping table according to the first difference; wherein the preset empirical value is 100 ppm;
determining a second target component of the manganese component in the primary fine adjustment process according to the target range of the manganese component, and determining the weight of the micro-carbon ferromanganese to be added in the primary fine adjustment process according to the second target component and the weight percentage of the manganese component in the molten steel after the primary coarse adjustment process, wherein the method comprises the following steps:
acquiring an upper limit value and a lower limit value of the target range, and determining the second target component according to the upper limit value and the lower limit value, wherein the second target component is an average value of the upper limit value and the lower limit value;
acquiring a second difference value between the second target component and the weight percentage of the manganese component in the molten steel after the primary coarse adjustment process, and searching the corresponding weight of the micro-carbon ferromanganese in the mapping table according to the second difference value;
a second determining unit, configured to determine, when performing RH secondary refining on the molten steel, a weight of micro-carbon ferromanganese to be added in a secondary coarse adjustment process according to the second target component and a weight percentage of a manganese component in the molten steel after the primary fine adjustment, including:
obtaining a third difference value between the second target component and the weight percentage of the manganese component in the molten steel after the first fine adjustment, and searching the weight of the micro-carbon ferromanganese corresponding to the third difference value in the mapping table;
after the second coarse adjustment, determining a third target component of the manganese component, including: obtaining a fourth difference value between the weight percentage of the manganese component in the molten steel after the secondary coarse adjustment and the second target component, wherein if the fourth difference value is a negative value, the third target component is a sum value between the second target component and the absolute value of the fourth difference value;
if the fourth difference is a positive value, the third target component is the difference between the second target component and the absolute value of the fourth difference;
and determining the weight of the micro-carbon ferromanganese to be added in the secondary fine adjustment process according to the third target component and the weight percentage of the manganese component in the molten steel after the secondary coarse adjustment.
5. The apparatus of claim 4, wherein the control unit is further to:
determining a first target component of the manganese component in the primary coarse adjustment process according to the target range of the manganese component, adding the micro-carbon ferromanganese into the molten steel after determining the weight of the micro-carbon ferromanganese to be added in the primary coarse adjustment process according to the first target component, stirring for 3-5 min, and controlling the temperature of the molten steel to rise by 20-50 ℃.
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