CN109112418B - Continuous casting method of high manganese steel - Google Patents

Continuous casting method of high manganese steel Download PDF

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CN109112418B
CN109112418B CN201710493251.1A CN201710493251A CN109112418B CN 109112418 B CN109112418 B CN 109112418B CN 201710493251 A CN201710493251 A CN 201710493251A CN 109112418 B CN109112418 B CN 109112418B
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casting
continuous casting
machine
manganese steel
controlled
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CN109112418A (en
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朱晓雷
廖相巍
安晓光
吴世龙
魏元
秦海山
李叶忠
严玲
周成
王爽
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Angang Steel Co Ltd
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Angang Steel Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/111—Treating the molten metal by using protecting powders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium

Abstract

The invention provides a continuous casting method of high manganese steel, which comprises the following components in percentage by weight: c: 0.21-0.25%, Mn: 4.5% -5.5%, Si: 0.2% -0.3%, P <0.008%, S <0.002%, and Al: 0.015% -0.04%, and the others are Fe and inevitable impurity elements, and the continuous casting method comprises the following steps: the second cooling section is divided into two modes for water supply, the first mode adopts a weak cooling waterline, the specific water amount is 0.15-0.25L/kg, and the second mode is that the last two area nozzles of the casting machine are closed; the invention solves the problem of the production of high manganese steel with larger total alloy amount and stronger crack sensitivity in the bloom continuous casting in the traditional process.

Description

Continuous casting method of high manganese steel
Technical Field
The invention belongs to the field of metallurgy, and particularly relates to a continuous casting method of high manganese steel.
Background
High manganese steel is widely applied to wear-resistant parts, automobiles, mining machinery, ocean platforms and the like in modern society. Because steel generally contains higher Mn, the steel is a steel grade with higher production difficulty in both alloying and continuous casting processes. Generally, the production of such steel grades is an electric arc furnace + die casting process in a special steel mill. The smelting of the electric arc furnace solves the problem of Mn alloying, and the die casting avoids the bending and straightening of continuous casting, thereby reducing the production risk. However, in the case of continuous casting, since Mn becomes high, the heat conductivity of molten steel is deteriorated, the thermal shrinkage coefficient is large, and the crystal grains of the cast slab are coarse, and the thermal stress becomes large. The molten steel of the high manganese steel has good fluidity, and certain steel leakage risk exists in the continuous casting. Domestic bloom casting machines are more, the production requirement of the steel is urgent, and the process is rarely reported.
Disclosure of Invention
The present invention has been made to overcome the above problems and disadvantages and to provide a continuous casting process of high manganese steel for bloom, which comprises the chemical composition of C: 0.2-0.25%, Mn: 4.5% -5.5%, Si: 0.2% -0.3%, P <0.008%, S <0.002%, and Al: 0.015% -0.04% of high manganese steel can be produced smoothly by using a conventional bloom casting machine.
The purpose of the invention is realized as follows:
a method for preparing high manganese steel comprises the steps of pouring molten steel from a tundish to a crystallizer to form a casting blank which is not completely solidified, and then drawing the casting blank which is not completely solidified from the crystallizer at a drawing speed V and passing the casting blank through a secondary cooling section to obtain a completely solidified casting blank;
(1) the chemical components of the high manganese steel provided by the invention comprise C: 0.21-0.25%, Mn: 4.5% -5.5%, Si: 0.2% -0.3%, P <0.008%, S <0.002%, and Al: 0.015-0.04%, the section of the continuous casting billet is 280 x 380 mm;
(2) the flow of the coal gas required by the baking of the tundish is 80-110 m3The baking time is more than 5 hours, the baking temperature is kept between 1360 and 1380 ℃, and the superheat degree of 20 to 25 ℃ is kept before the machine for pouring;
(3) and blowing argon gas at the upper nozzle in a full range 25-30 min before casting, closing the ladle cover after blowing argon gas at the ladle cover and adding a covering agent, wherein the argon blowing requirement at the long nozzle is 55-65% of the full range, and the covering requirement of the tundish is not allowed to expose molten steel. In order to improve the capacity of adsorbing impurities of the tundish slag, a magnesium covering agent is used as the covering agent;
(4) the operation of a single slag line is used before the machine, the thickness of the total slag layer is controlled within 35 plus or minus 5mm, the automatic speed raising operation is carried out, the fluctuation of the liquid level is controlled within plus or minus 2mm, the electromagnetic stirring current of the crystallizer is 480-520A, the frequency is 1.2-1.8 Hz, the electromagnetic stirring current of the solidification tail end is 580-620A, the frequency is 4.5-5.5 Hz,
(5) the main component CaO of the continuous casting covering slag is: 32% +/-3% SiO2：24％±3％，Al2O3≤8％，C：30％±2％，F：6％±3％，MgO≤8％，H2O is less than or equal to 0.5 percent, and the melting point is as follows: 955 +/-30 ℃ at 1300 DEG CViscosity: 0.11 +/-0.09 pa.s/(1300 ℃).
(6) In order to ensure the surface quality of the casting blank, the temperature of the discharged withdrawal and straightening machine is controlled to be 900-950 ℃, the standard withdrawal speed is required to be 0.6-0.8 m/min, and the withdrawal speed is constant; the second cooling section is divided into two modes for supplying water, a weak cooling waterline is adopted in the first mode, the specific water amount is 0.15-0.25L/kg, the casting blank is slowly cooled, the quality of the casting blank is ensured, and the second mode, namely nozzles in the last two areas of the casting machine are closed, so that the generation of cracks is further prevented;
(6) in order to prevent stress cracks of the high alloy steel, a casting blank adopts a hot charging system, and quickly enters a heating furnace with a temperature rush, so that the surface temperature of the casting blank entering the furnace is ensured to be 650-700 ℃.
The method has the beneficial effects that the method provided by the invention solves the problem of the production of high manganese steel with larger total alloy amount and stronger crack sensitivity in the bloom continuous casting in the traditional process. Because the alloy amount is large, the strength of steel is high, the crack sensitivity caused by high manganese is enhanced, the requirement on the quality of casting blanks is high, and the original conventional continuous casting process cannot meet the production requirement. The invention adjusts the cooling mode, the drawing speed, the tundish baking, the temperature-controlled heating furnace feeding and other processes, tests show that the casting blank has good surface and internal quality, the inclusion control is less than 0.5 grade, and the production of the bloom on the high manganese steel is satisfied.
Detailed Description
The present invention is further illustrated by the following examples.
Example 1:
a method for producing high manganese steel, which comprises the following steps,
(1) the tundish molten steel of the test steel comprises the following components: 0.24%, Mn: 5.02%, Si: 0.27%, P: 0.0073%, S: 0.0019% and Al: 0.033% to produce a conventional bloom caster with a section of 280 x 380 mm;
(2) the baking of the tundish requires small fire, and the gas flow is 90m35.6 hours, keeping the baking temperature at 1370-1375 ℃ and the degree of superheat in front of the machine to 26 ℃;
(3) blowing argon gas at the water feeding port in full range 28min before casting, closing the ladle cover after blowing argon gas at the ladle cover and adding a covering agent during casting, and blowing argon gas at the long water feeding port to open a valve by 60 percent, wherein the covering requirement of the tundish is not allowed to expose molten steel; the tundish covering agent adopts a magnesium covering agent;
(4) the method is characterized in that single slag line operation is used before the machine, the total slag layer thickness is controlled within 35 +/-5 mm, automatic speed raising operation is carried out, liquid level fluctuation is controlled within +/-2 mm, electromagnetic stirring current of a crystallizer is 500A, the frequency is 1.5Hz, and electromagnetic stirring current of a solidification tail end is 600A, and the frequency is 5 Hz;
(5) the compositions of the mold flux are shown in Table 1;
TABLE 1 high manganese Steel casting powder main Components
(5) Controlling the temperature of the withdrawal and straightening machine to be 930 ℃, the withdrawal speed to be 0.70m/min, and operating at a constant withdrawal speed; the second cooling section is divided into two modes for water supply, the first mode adopts a weak cooling waterline, the specific water amount is 0.2L/Kg, and the second mode is that the nozzles of the last two areas of the casting machine are closed;
(6) the casting blank adopts a hot charging system, quickly enters a heating furnace after temperature is controlled, and the surface temperature of the casting blank entering the furnace is 680 ℃.
And (4) carrying out high-power and low-power inspection on the produced casting blank. Through inspection, the high-power inclusions of A class, B class, C class and D class are all controlled below 0.5 grade. In the aspect of low power, the quality of the interior and the surface of the casting blank is good, and the center porosity, the center segregation and the shrinkage cavity are all controlled below 1.0 level, so that the production of the bloom on the high manganese steel is met.
Example 2:
(1) the tundish molten steel of the test steel comprises the following components: 0.22%, Mn: 5.21%, Si: 0.26%, P: 0.0071%, S: 0.0018% and Al: 0.034%, producing a conventional bloom caster with a cross-section of 280 x 380 mm;
(2) the baking of the tundish requires small fire, and the gas flow is 95m35.5 hours, keeping the baking temperature at 1361-1367 ℃, keeping the superheat degree of 27 ℃ before the machine, and carrying out hot pouring;
(3) blowing argon gas at the water feeding port in full range 30min before casting, closing the ladle cover after blowing argon gas at the ladle cover and adding a covering agent during casting, and blowing argon gas at the long water feeding port to open a valve by 60 percent, wherein the covering requirement of the tundish is not allowed to expose molten steel; reinforcing protective pouring by using a long nozzle with a platform, wherein a tundish covering agent is a magnesium covering agent;
(4) the method is characterized in that single slag line operation is used before the machine, the total slag layer thickness is controlled within 35 +/-5 mm, automatic speed raising operation is carried out, liquid level fluctuation is controlled within +/-2 mm, electromagnetic stirring current of a crystallizer is 500A, the frequency is 1.5Hz, and electromagnetic stirring current of a solidification tail end is 600A, and the frequency is 5 Hz;
(5) the compositions of the mold flux are shown in Table 2;
TABLE 2 main Components (wt%) of high manganese Steel mold flux
(6) Controlling the temperature of the withdrawal and straightening machine at 940 ℃, the withdrawal speed at 0.70m/min and operating at a constant withdrawal speed; the second cooling section is divided into two modes for water supply, the first mode adopts a weak cooling waterline, the specific water amount is 0.2L/Kg, and the second mode is that the nozzles of the last two areas of the casting machine are closed;
(7) the casting blank adopts a hot charging system, quickly enters a heating furnace after temperature is controlled, and the surface temperature of the casting blank entering the furnace is 690 ℃.
Example 3:
(1) the tundish molten steel of the test steel comprises the following components: 0.24%, Mn: 5.29%, Si: 0.29%, P: 0.0075%, S: 0.0014% and Al: 0.038% to produce a conventional bloom caster with a cross-section of 280 x 380 mm;
(2) the baking of the tundish requires small fire, and the gas flow is 100m35.5 hours, keeping the baking temperature at 1361-1372 ℃ and the superheat degree in front of the machine at 26 ℃;
(3) and blowing argon gas at the upper nozzle in full range 32min before casting, closing the ladle cover after blowing argon gas at the ladle cover and adding a covering agent during casting, and opening the long nozzle blowing argon gas by 62 percent, wherein the covering requirement of the tundish is not allowed to expose molten steel. The tundish covering agent adopts a magnesium covering agent;
(4) the method is characterized in that single slag line operation is used before the machine, the total slag layer thickness is controlled within 35 +/-5 mm, automatic speed raising operation is carried out, liquid level fluctuation is controlled within +/-2 mm, electromagnetic stirring current of a crystallizer is 510A, the frequency is 1.6Hz, and electromagnetic stirring current of a solidification tail end is 610A, and the frequency is 5.4 Hz;
(5) the compositions of the mold flux are shown in Table 3;
TABLE 3 main component (wt%) of high manganese steel mold flux
(5) The temperature of the withdrawal and straightening machine is controlled to be 945 ℃, the withdrawal speed is 0.70m/min, and the withdrawal speed is constant; the second cooling section is divided into two modes for water supply, the first mode adopts a weak cooling waterline, the specific water amount is 0.2L/Kg, and the second mode is that the nozzles of the last two areas of the casting machine are closed;
(6) the casting blank adopts a hot charging system, quickly enters a heating furnace with temperature being controlled, and the surface temperature of the casting blank entering the furnace is 694 ℃.
And (4) carrying out high-power and low-power inspection on the produced casting blank. Through inspection, the high-power inclusions of A class, B class, C class and D class are all controlled below 0.5 grade. In the aspect of low power, the quality of the interior and the surface of the casting blank is good, and the center porosity, the center segregation and the shrinkage cavity are all controlled below 1.0 level, so that the production of the bloom on the high manganese steel is met.

Claims (1)

1. A continuous casting method of high manganese steel is characterized in that,
(1) the high manganese steel comprises the following components in percentage by weight: c: 0.21% -0.25%, Mn: 4.5% -5.5%, Si: 0.2% -0.3%, P <0.008%, S <0.002%, and Al: 0.015-0.04%, and the balance Fe and inevitable impurity elements, wherein the section of the continuous casting billet is 280-380 mm;
(2) the flow of the gas required by the baking of the tundish is 80-110 m3The baking time is more than 5 hours, the baking temperature is kept at 1360-1380 ℃, and the superheat degree of 20-25 ℃ is kept before the machine;
(3) blowing argon gas at the water feeding port in full range 25-30 min before casting, closing the ladle cover after argon gas blowing at the ladle cover is performed and the covering agent is added in casting, wherein the argon blowing requirement at the long water feeding port is 55-65% of the full range, and the covering requirement of the tundish is not allowed to expose molten steel; the covering agent is magnesium covering agent;
(4) the method is characterized in that single slag line operation is used before the machine, the total slag layer thickness is controlled to be 35 +/-5 mm, automatic speed raising operation is carried out, liquid level fluctuation is controlled to be within +/-2 mm, electromagnetic stirring current of a crystallizer is 480-520A, the frequency is 1.2-1.8 Hz, electromagnetic stirring current of a solidification tail end is 580-620A, and the frequency is 4.5-5.5 Hz;
(5) continuous casting covering slagThe components by weight percentage are as follows: CaO: 32% +/-3% SiO2：24%±3%，Al2O3≤8%，C：30%±2%，F：6%±3%，MgO≤8%，H2O is less than or equal to 0.5 percent, and the melting point is as follows: 955 +/-30 ℃, viscosity at 1300 ℃: 0.11 plus or minus 0.09 Pa.s;
(6) the temperature of the withdrawal and straightening machine is controlled to be 900-950 ℃, the withdrawal speed is 0.6-0.8 m/min, and the withdrawal speed is constant; the second cooling section is divided into two modes for water supply, the first mode adopts a weak cooling waterline, the specific water amount is 0.15-0.25L/kg, and the second mode is that the last two area nozzles of the casting machine are closed;
(7) and the casting blank adopts a hot charging system, and the surface temperature of the casting blank entering the furnace is ensured to be 650-700 ℃.
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