CN113430334B - GOR smelting method for improving scrap steel ratio of 200 series stainless steel - Google Patents
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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
- C21C7/068—Decarburising
- C21C7/0685—Decarburising of stainless steel
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/005—Manufacture of stainless steel
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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
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- Y02P10/20—Recycling
Abstract
The invention provides a GOR smelting method for improving the scrap steel ratio of 200 series stainless steel, which combines heat balance and mass balance to establish a formula 1: t1+ T2 XΔ W-T3 XM 1-T4 ≧ T5 and equation 2: m1+ M2-M3 is not more than M4, and the maximum addition amount of the 200 series stainless steel scrap is calculated according to a formula 1 and a formula 2; meanwhile, according to the influence of 200 series stainless steel scrap on the decarburization behavior of the stainless steel molten steel, the decarburization behavior of the stainless steel is determined by formula 3: m1+ M2-M3 ≦ M4 and formula 4: alpha [ C]^3×ɑ(Cr 2 O 3 )/ɑ[Cr]^2=P CO The 3/K provides a reasonable oxygen blowing system (namely the oxygen blowing amount of oxygen blown by a bottom gun of the GOR furnace and the partial pressure P of carbon monoxide CO ) Therefore, the high smelting efficiency and the low cost of the GOR are ensured while the scrap ratio of the 200-series stainless steel is effectively improved to be more than or equal to 6 percent.
Description
Technical Field
The invention belongs to the field of stainless steel smelting, and particularly relates to a GOR smelting method for improving the scrap steel ratio of 200 series stainless steel.
Background
200 series stainless steel is widely used in the fields of household decoration, kitchen ware, household appliances and the like as nickel-saving economical stainless steel. Along with the gradual increase of 200 series stainless steel scrap steel in China, the improvement of the utilization rate of the 200 series stainless steel scrap steel in the stainless steel production process is beneficial to reducing the smelting cost, and the method also accords with the development direction of low carbon, green and low emission advocated by the nation.
However, the total amount of cold burden (including 4-10% of high-carbon ferrochrome, 4-9% of lime, 4-6% of silicon-manganese alloy and 2-4% of 200 series scrap steel) added in the prior GOR smelting process of 200 series stainless steel is large (generally reaching more than 17%); meanwhile, the heat balance is not comprehensively considered in the smelting process, when the addition amount of the scrap steel is further increased, the situation of insufficient heat in the smelting process is easy to occur, so that the metal is easy to oxidize in the oxygen blowing smelting process, the consumption of the reduced silicon (the reduced silicon means the consumption of the ferrosilicon used for reducing the metal) is higher, the total consumption of ferrosilicon (the consumption of the ferrosilicon is more than 20 kg/t) is increased, and the smelting cost is increased. Meanwhile, the 200 series stainless steel scrap generally contains 8-12% of manganese element, the manganese content of the molten steel can be increased by adding a large amount of 200 series stainless steel scrap, the activity of carbon element can be reduced by the higher manganese content, and the decarburization reaction is inhibited; when the manganese content in the molten steel is higher and the carbon content is lower, a larger oxygen flow is still adopted, so that a large amount of metal elements such as chromium, manganese and the like in the molten steel are oxidized, and the alloy yield (less than 95%) and the GOR smelting efficiency are reduced.
Disclosure of Invention
The invention aims to provide a GOR smelting method for improving the scrap ratio of 200 series stainless steel, which can solve the technical problem that the use amount of the 200 series stainless steel scrap is difficult to effectively increase in the conventional 200 series stainless steel smelting process, and can control the consumption of oxidation and reduction silicon of metals such as chromium, manganese and the like at a lower level and improve the smelting efficiency.
A GOR smelting method for increasing the scrap steel ratio of 200 series stainless steel comprises the following steps: (1) pouring 200 series stainless steel primary refining molten steel into a GOR furnace, wherein a top gun and a bottom gun are used for blowing oxygen and decarbonizing according to the current oxygen blowing oxygen flow, high-carbon ferrochrome and lime are added during the oxygen blowing decarbonization, and the decarbonization is carried out until the molten steel components meet the requirements: the carbon content is 0.4-0.7%; and then stopping blowing the top lance, and adding 200 series of scrap steel into the GOR furnace to ensure that the molten steel components meet the following requirements: the carbon content is 0.4-0.7%, and the manganese content is 0.5-3%; then, adjusting the oxygen flow and the oxygen blowing time of the bottom gun to be the specific oxygen blowing flow and the specific oxygen blowing time of the bottom gun, and continuing to blow oxygen by the bottom gun until the carbon content in the molten steel meets the requirements of finished products;
wherein the high carbon ferrochrome and lime are added according to the conventional adding amount of the high carbon ferrochrome and the lime in the existing 200 series stainless steel production process;
wherein the addition amount of the 200 series stainless steel scrap steel is determined according to the following method:
firstly pouring 200 series stainless steel primary smelting molten steel into a GOR furnace, obtaining the components, weight and initial temperature of the molten steel entering the furnace, and then calculating the maximum addition of 200 series stainless steel scrap steel according to the heat balance formula of the following formula 1 and the mass balance formula of the following formula 2:
t1+ T2 XDeltaW-T3 XM 1-T4 is more than or equal to T5 formula 1;
in the formula: t1-initial temperature of molten steel entering the furnace, DEG C; t2-assuming the temperature rise of the corresponding oxide per unit mass at the temperature of DEG C/T when each element in the molten steel is oxidized; Δ W-assuming the oxide mass increment, t, corresponding to the oxidation of each element in the molten steel; t3-temperature drop, DEG C/T, brought by the addition of cold charge per unit mass; m1-cold material comprises the total adding amount of 200 series stainless steel scrap steel, high carbon ferrochrome and lime, t; t4-temperature reduction in the smelting process, DEG C; t5-temperature of molten steel before addition of reduced silicon, ° C;
m1+ M2-M3 is not more than M4, formula 2;
in the formula: m1-total amount of cold burden (including 200 series stainless steel scrap, high carbon ferrochrome and lime) added, t; m2-weight of molten steel entering the furnace, t; m3-decarburization and desilication quality in the smelting process, t; M4-GOR furnace charge, t;
taking the maximum addition of the total cold charge addition amount M1 which meets the formula 1 and the formula 2 as the maximum addition of the total cold charge addition amount, and subtracting the total amount of other cold charges except the 200 series stainless steel scrap from the maximum addition of the total cold charge addition amount to obtain the maximum addition of the 200 series stainless steel scrap;
wherein the specific bottom lance oxygen-blowing flow rate and oxygen-blowing time are determined according to the following method:
v1= V2/η formula 3;
in the formula: v1, total amount of oxygen blown in, m 3 (ii) a V2 theoretical oxygen consumption, m, required for decarburization of the molten steel 3 (ii) a Eta, the decarburization oxygen utilization ratio of the GOR furnace,%.
ɑ[C]^3×ɑ(Cr 2 O 3 )/ɑ[Cr]^2=P CO ^3/K formula 4;
in the formula: alpha [ C]Activity of carbon in the molten steel; alpha (Cr) 2 O 3 ) The activity of chromium oxide; alpha [ Cr ]]The activity of chromium; p CO Carbon monoxide partial pressure; k, decarburization equilibrium constant;
the total oxygen blowing amount V1 of bottom lance oxygen blowing of GOR furnace can be obtained from equation 3, and the partial carbon monoxide pressure P of bottom lance oxygen blowing of GOR furnace can be obtained from equation 4 CO ；
According to the total bottom lance flow of the GOR furnace (the total bottom lance flow of the GOR furnace is determined by the characteristics of the GOR furnace type) and the partial pressure P of carbon monoxide in the formula 4 CO Calculating to obtain the specific oxygen flow of the bottom lance; meanwhile, further calculating according to the total oxygen amount V1 blown in and the specific bottom gun oxygen blowing oxygen flow in the formula 3 to obtain the specific bottom gun oxygen blowing time;
(2) and after oxygen blowing is finished, adding reduced silicon into the GOR furnace, and stopping slag and tapping.
According to production practice experience and in combination with heat balance and mass balance, the method establishes a formula 1 and a formula 2, and calculates the maximum addition amount of 200 series stainless steel scrap according to the formula 1 and the formula 2; meanwhile, according to the influence of 200 series stainless steel scrap on the decarburization behavior of the stainless steel molten steel, a reasonable oxygen blowing system (namely, the oxygen blowing amount and the carbon monoxide partial pressure P of oxygen blown by a bottom lance of the GOR furnace) is provided by the formula 3 and the formula 4 CO ) Therefore, the high smelting efficiency and the low cost of the GOR are ensured while the scrap ratio of the 200-series stainless steel is effectively improved to be more than or equal to 6 percent.
In the specific implementation process, the flow of oxygen blown by the existing top lance is 0.8-1.6Nm 3 V (min. t), the oxygen flow rate of the conventional bottom lance is 0.6-0.90Nm 3 /(min·t)。
In the specific implementation process, the weight of the high-carbon ferrochrome accounts for 4-10% of the molten steel by mass, and the weight of the lime accounts for 4-9% of the molten steel by mass.
Wherein the addition amount of the reduced silicon in the step (2) is determined according to the following method:
m5= M6+ M7+ M8 formula 5;
in the formula: m5, the addition amount of reduced silicon, t; m6, total mass t of chromium oxide in the slag after oxygen blowing; m7, total mass t of manganese oxide in the slag after oxygen blowing; m8, total mass of ferrous oxide in the slag after oxygen blowing is finished, t.
Preferably, the reduced silicon is one or two of high silicon manganese or silicon manganese alloy.
Detailed Description
The present invention is described in further detail below with reference to examples, and it should be understood that the examples described herein are only for the purpose of illustrating and explaining the present invention, and are not intended to limit the present invention.
Example 1
The method adopts 200 series stainless steel primary smelting molten steel obtained by blast furnace-LD to produce the steel grade 09Cr15Mn10Ni2CuN, and the GOR smelting method comprises the following specific steps:
(1) pouring 200 series stainless steel primary smelting molten steel into a GOR furnace, detecting that the weight of GOR furnace-entering molten steel is 80.8t, the furnace-entering initial temperature is 1434 ℃, and the mass fractions of all elements of the molten steel are as follows:
[C] the method comprises the following steps 3.246%, [ Si ]: 0.18%, [ Mn ]: 0.51%, [ P ]: 0.052%, [ S ]: 0.048%, [ Cr ]: 12.52%, [ Ni ]: 1.45%, [ Cu ]: 0.03%, [ N ]: 0.013%, the balance of Fe and other elements;
and calculating the maximum addition amount of the 200 series stainless steel scrap according to the heat balance formula of the following formula 1 and the mass balance formula of the following formula 2:
t1+ T2 XDeltaW-T3 XM 1-T4 is more than or equal to T5 formula 1;
in the formula: t1-initial temperature of molten steel entering the furnace, DEG C; t2-temperature rise per unit mass of oxide at a temperature of DEG C/T when each element in molten steel is supposed to be oxidized; Δ W-assuming the oxide mass increment, t, corresponding to the oxidation of each element in the molten steel; t3-temperature drop, DEG C/T, due to the addition of cold charge per unit mass; m1-total amount of cold materials (including 200 series stainless steel scrap, high carbon ferrochrome, lime and the like) added, t; t4-temperature reduction in the smelting process, DEG C; t5-temperature of molten steel before addition of reduced silicon, ° C;
m1+ M2-M3 is not more than M4, formula 2;
in the formula: m1-total amount of cold charge (including 200 series stainless steel scrap, high carbon ferrochrome and lime) added, t; m2-weight of molten steel entering the furnace, t; m3-decarburization and desilication quality in the smelting process, t; M4-GOR furnace charge, t;
taking the maximum adding amount of the total adding amount M1 of the cold burden satisfying the formula 1 and the formula 2 as the maximum adding amount of the total adding amount of the cold burden, and subtracting the total adding amount of other cold burden except the 200 series stainless steel scrap from the maximum adding amount of the total adding amount M1 of the cold burden to obtain the maximum adding amount of the 200 series stainless steel scrap;
TABLE 1
Then, carrying out oxygen blowing decarburization by a top gun and a bottom gun of the GOR furnace according to the existing oxygen blowing oxygen flow, carrying out top-bottom combined blowing for 16min, and adding high-carbon ferrochrome and lime during the top-bottom combined blowing; when the carbon content in the molten steel reaches 0.53 percent, stopping blowing by a top lance, and adding the 200 series stainless steel scrap steel with the maximum addition amount obtained by the calculation into the GOR furnace to ensure that the molten steel components meet the following requirements: the carbon content is 0.51-0.55%, and the manganese content is 1.6%; and according to the formula 3 and the formula 4, the oxygen flow of the oxygen blown by the bottom gun is adjusted to be 0.45 Nm 3 V (min. t), continuing to blow oxygen until the carbon content in the molten steel meets the requirement of a finished product;
the oxygen flow of the bottom lance oxygen blowing is determined according to the following method:
v1= V2/η formula 3;
in the formula: V1-Total amount of oxygen blown in, m 3 (ii) a Theoretical oxygen consumption m corresponding to decarburization of V2-200 series stainless steel scrap 3 (ii) a eta-GOR furnaceUtilization ratio of decarbonized oxygen,%.
ɑ[C]^3×ɑ(Cr 2 O 3 )/ɑ[Cr]^2=P CO ^3/K formula 4;
in the formula: alpha [ C]-the activity of carbon in the liquid steel; alpha (Cr) 2 O 3 ) -the activity of chromium oxide; alpha [ Cr ]]-the activity of chromium; p CO -carbon monoxide partial pressure; k-decarburization equilibrium constant;
wherein alpha [ C]Activity of carbon in the molten steel; alpha (Cr) 2 O 3 ) The activity of chromium oxide; alpha [ Cr ]]The activity of chromium; the activity of each component can be calculated by a thermodynamic law and a formula, belongs to the known technology in the field, and is not described herein;
the oxygen blowing amount V1 of bottom lance oxygen blowing of GOR furnace can be obtained from the formula 3, and the carbon monoxide partial pressure P of bottom lance oxygen blowing of GOR furnace can be obtained from the formula 4 CO ；
TABLE 2
(2) And after oxygen blowing is finished, adding 4.4t of high-silicon silicomanganese, controlling the temperature of molten steel to be 1592 ℃, and performing GOR slag stopping and tapping to obtain 97.8t of molten steel, wherein the components of the tapped molten steel are as follows:
[C] the method comprises the following steps 0.071%, [ Si ]: 0.34%, [ Mn ]: 9.36%, [ P ]: 0.036%, [ S ]: 0.002%, [ Cr ]: 14.6%, [ Ni ]: 1.28%, [ Cu ]: 1.35%, [ N ]: 0.162 percent, and the balance of Fe and other elements.
The loading capacity of the M4-GOR furnace and the utilization of the decarburization oxygen of the eta-GOR furnace are determined by the characteristics of the GOR furnace.
In example 1, the scrap ratio of 200 series stainless steel is 11.9%, the metal yield is 96.7%, and the consumption of silicon iron per ton steel is 16.8 kg/t.
Example 2
In the embodiment, the blast furnace-LD-GOR process is adopted to smelt the stainless steel, the produced steel grade is 12Cr14Mn10NiN, and the specific steps of the GOR smelting method are different from those in the embodiment 1:
(1) the weight of GOR molten steel entering a furnace is 83.7t, the initial temperature of the molten steel entering the furnace is 1433 ℃, and the mass fractions of all elements of the molten steel are as follows:
[C] the method comprises the following steps 3.011%, [ Si ]: 0.19%, [ Mn ]: 0.48%, [ P ]: 0.06%, [ S ]: 0.061%, [ Cr ]: 10.2%, [ Ni ]: 1.34%, [ Cu ]: 0.04%, [ N ]: 0.029%, and the balance of Fe and other elements;
TABLE 3
When the carbon content in the molten steel reaches 0.48 percent, stopping blowing by the top lance; after 200 series stainless steel scrap steel is added, the molten steel components meet the following requirements: the carbon content is 0.47-0.49%, and the manganese content is 1.1%; the oxygen flow of the bottom lance is adjusted to be 0.42Nm 3 /(min·t)；
TABLE 4
(2) After oxygen blowing is finished, 3.7t of high-silicon silicomanganese and 0.6t of silicomanganese alloy are added, the temperature of molten steel is 1601 ℃, GOR slag stopping and tapping are carried out, 99t of molten steel is tapped, and the components of the molten steel are as follows:
[C] the method comprises the following steps 0.102%, [ Si ]: 0.54%, [ Mn ]: 9.71%, [ P ]: 0.038%, [ S ]: 0.004%, [ Cr ]: 13.21%, [ Ni ]: 1.18%, [ Cu ]: 0.28%, [ N ]: 0.131%, and the balance of Fe and other elements.
In example 2, the ratio of 200 series stainless steel scrap is 7.3%, the metal yield is 95.2%, and the consumption of ferrosilicon per ton steel is 14.8 kg/t.
From the test results of example 1 and example 2, it can be seen that: by using the smelting method, the scrap steel ratio of 200 series stainless steel is more than or equal to 6 percent, the metal yield is more than or equal to 95 percent, the consumption of per ton steel ferrosilicon is less than or equal to 17kg/t, and the comprehensive cost for smelting stainless steel is reduced.
Comparative example 1
The comparative example adopts a blast furnace-LD-GOR process to smelt the stainless steel, the produced steel grade is 8Cr14Mn10Ni2CuN, and the smelting steps are as follows:
(1) the GOR molten steel weight is 83.3t, the temperature of the molten steel in the furnace is 1434 ℃, and the mass fractions of the components of the molten steel in the furnace are as follows:
[C] the method comprises the following steps 3.45%, [ Si ]: 0.13%, [ Mn ]: 0.53%, [ P ]: 0.052%, [ S ]: 0.039%, [ Cr ]: 11.11%, [ Ni ]: 1.32%, [ Cu ]: 0.02%, [ N ]: 0.015 percent and the balance of Fe and other elements.
3.2t of 200 series stainless steel scrap, 4.6t of high-carbon ferrochrome, 6.2t of lime and 3745m of total oxygen blowing amount are added in the GOR smelting process 3 。
(2) In the reduction period, 5.7t of high-silicon silicomanganese is added, the temperature of molten steel is 1777 ℃, GOR slag stopping and tapping are carried out, the amount of the tapped molten steel is 91t, and the components of the molten steel are as follows:
[C] the method comprises the following steps 0.086%, [ Si ]: 0.4%, [ Mn ]: 10.73%, [ P ]: 0.036%, [ S ]: 0.003%, [ Cr ]: 13.55%, [ Ni ]: 1.17%, [ Cu ]: 0.82%, [ N ]: 0.138%, and the balance of Fe and other elements.
In the comparative example, the ratio of 200 series stainless steel to scrap steel is 3.3%, the metal yield is 94.5%, and the consumption of silicon iron per ton steel is 22.6 kg/t.
The sources of the 200 series stainless steel scrap used in all the examples and comparative examples of the present invention were: 200 series of scrap steel purchased according to national standard. The 200 series stainless steel scrap comprises the following components: [C] the method comprises the following steps Not more than 0.2%, and [ Si ]: 0.2 to 0.5%, [ Mn ]: ≥ 9%, [ P ]: not more than 0.06%, and [ S ]: not more than 0.01%, and [ Cr ]: not less than 13.5%, [ Ni ]: not less than 1.0%, [ Cu ]: not less than 0.3 percent, and the balance of Fe and other elements.
Claims (3)
1. A GOR smelting method for increasing the scrap steel ratio of 200 series stainless steel comprises the following steps:
(1) pouring 200 stainless steel primary smelting molten steel into a GOR furnace, carrying out oxygen blowing decarburization by a top lance and a bottom lance according to the current oxygen blowing oxygen flow, adding high-carbon ferrochrome and lime during the oxygen blowing decarburization, and decarburizing until the molten steel components meet the following requirements: the carbon content is 0.4-0.7%; and then stopping blowing the top lance, and adding 200 series of scrap steel into the GOR furnace to ensure that the molten steel components meet the following requirements: the carbon content is 0.4-0.7%, and the manganese content is 0.5-3%; then, adjusting the oxygen flow and the oxygen blowing time of the bottom gun to be the specific oxygen blowing flow and the specific oxygen blowing time of the bottom gun, and continuing to blow oxygen by the bottom gun until the carbon content in the molten steel meets the requirements of finished products;
wherein the weight of the high-carbon ferrochrome accounts for 4-10% of the molten steel by mass, and the weight of the lime accounts for 4-9% of the molten steel by mass;
wherein the addition amount of the 200 series stainless steel scrap steel is determined according to the following method:
firstly, pouring 200 series stainless steel primary smelting molten steel into a GOR furnace, obtaining the components, weight and initial temperature of the molten steel entering the furnace, and then calculating the maximum adding amount of 200 series stainless steel waste steel according to the heat balance formula of the following formula 1 and the mass balance formula of the following formula 2:
t1+ T2 XDeltaW-T3 XM 1-T4 is more than or equal to T5 formula 1;
in the formula: t1-initial temperature of molten steel entering the furnace, DEG C; t2-temperature rise per unit mass of oxide at a temperature of DEG C/T when each element in molten steel is supposed to be oxidized; Δ W-assuming the mass increase t of the oxide corresponding to the oxidation of each element in molten steel; t3-temperature drop, DEG C/T, due to the addition of cold charge per unit mass; m1-cold material comprises 200 series stainless steel scrap steel, high carbon ferrochrome and lime; t4-temperature drop in the smelting process, DEG C; t5-temperature of molten steel before addition of reduced silicon, ° C;
m1+ M2-M3 is not more than M4, formula 2;
in the formula: m1-cold material comprises the total adding amount of 200 series stainless steel scrap steel, high carbon ferrochrome and lime, t; m2-weight of molten steel entering the furnace, t; m3-decarburization and desilication quality in the smelting process, t; M4-GOR furnace charge, t;
taking the maximum addition of the total cold charge addition amount M1 which meets the formula 1 and the formula 2 as the maximum addition of the total cold charge addition amount, and subtracting the total amount of other cold charges except the 200 series stainless steel scrap from the maximum addition of the total cold charge addition amount to obtain the maximum addition of the 200 series stainless steel scrap;
wherein the specific bottom lance oxygen-blowing flow rate and oxygen-blowing time are determined according to the following method:
v1= V2/η formula 3;
in the formula: v1, total amount of oxygen blown in, m 3 (ii) a V2 theoretical oxygen consumption, m, required for decarburization of the molten steel 3 (ii) a Eta, the decarburization oxygen utilization rate of the GOR furnace,%;
ɑ[C]^3×ɑ(Cr 2 O 3 )/ɑ[Cr]^2=P CO ^3/K formula 4;
in the formula: alpha [ C]Activity of carbon in the molten steel; alpha (Cr) 2 O 3 ) The activity of chromium oxide; alpha [ Cr ]]The activity of chromium; p CO Carbon monoxide partial pressure; k, decarburization equilibrium constant;
the total oxygen blowing amount V1 of bottom lance oxygen blowing of GOR furnace can be obtained from equation 3, and the partial carbon monoxide pressure P of bottom lance oxygen blowing of GOR furnace can be obtained from equation 4 CO ；
According to the total flow of the bottom lance of the GOR furnace and the partial pressure P of carbon monoxide in the formula 4 CO Calculating to obtain the specific bottom lance oxygen blowing flow, wherein the total bottom lance flow of the GOR furnace is determined by the GOR furnace type characteristics; meanwhile, further calculating according to the total oxygen amount V1 blown in and the specific bottom gun oxygen blowing oxygen flow in the formula 3 to obtain the specific bottom gun oxygen blowing time;
(2) and after oxygen blowing is finished, adding reduced silicon into the GOR furnace, and stopping slag and tapping.
2. The GOR smelting method for increasing the scrap ratio of 200 series stainless steel according to claim 1, wherein the GOR smelting method comprises the following steps: the addition amount of the reduced silicon in the step (2) is determined according to the following method:
m5= M6+ M7+ M8 formula 5;
in the formula: m5, the addition amount of reduced silicon, t; m6, total mass t of chromium oxide in the slag after oxygen blowing; m7, total mass t of manganese oxide in the slag after oxygen blowing; m8, total mass of ferrous oxide in the slag after oxygen blowing is finished, t.
3. The GOR smelting method for increasing the scrap steel ratio of 200 series stainless steel according to claim 1, wherein the GOR smelting method comprises the following steps: the reduction silicon adopts one or the combination of two of high silicon manganese or silicon manganese alloy.
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