CN111663071A - Economical chromium-manganese stainless steel smelting production method and system thereof - Google Patents
Economical chromium-manganese stainless steel smelting production method and system thereof Download PDFInfo
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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- C21C7/064—Dephosphorising; Desulfurising
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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Abstract
The invention belongs to the technical field of stainless steel smelting, and relates to an economical chromium-manganese stainless steel smelting production method and system. The invention relates to an economical smelting production method of chromium-manganese stainless steel, which comprises the following steps: (1) adding stainless steel scrap into an alloy melting furnace, and electrifying and melting to obtain stainless steel mother liquor; (2) sampling and analyzing the stainless steel mother liquor, and reporting the components to an AOD refining process; (3) adding the stainless steel mother liquor into an AOD refining converter, and finishing decarburization and chromium protection and component adjustment by using a process control model to obtain stainless steel liquid; (4) and transferring the stainless steel liquid to an LF ladle refining furnace, and carrying out continuous casting after slagging and desulfurization. The economical smelting production method of the chromium-manganese stainless steel has the advantages of high element yield, low investment and operation cost, energy conservation and emission reduction, and accordance with the sustainable development concept.
Description
Technical Field
The invention belongs to the technical field of stainless steel smelting, and relates to an economical chromium-manganese stainless steel smelting production method and system.
Background
In 2016, the yield of stainless steel crude steel in China reaches 2493.78 ten thousand tons, which accounts for 54.45 percent of the world stainless steel crude steel yield, and the innovation is high. Wherein, the yield of the chrome manganese series stainless steel (200 series Cr-Mn steel) reaches 731.79 ten thousand tons, which accounts for 29.34 percent of the stainless steel yield in China, and is only second to 300 series stainless steel (chrome nickel series).
The main brand chemical compositions of the 200 series stainless steel are shown in table 1, and have common application in building decoration (building components, decoration), plate/pipe products, guardrails, kitchen ware, sanitary equipment and appliances, household appliance components and shells, transportation and industrial part equipment and parts. In China, Guangdong uncovers Yang and Buddha mountain, Jiangsu wears a south belt, a large number of stainless steel processing enterprises can classify and recycle a large number of stainless steel processing leftover materials, waste pipe materials and the like, and the recycling amount of 200 series stainless steel waste steel in the area of Guangdong uncovering Yang and Buddha mountain is about 5 ten thousand tons/month.
Main grade chemical composition of stainless steel in watch 1200 series
In the prior art, chrome-manganese stainless steel mainly has two production processes, one is a short process, stainless steel scrap is used as a main raw material, the stainless steel scrap is put into an electric arc furnace to be melted by utilizing the traditional two-step method, namely, the electric arc furnace and the AOD production process, the melted mother solution is put into an AOD refining converter, and the component adjustment is carried out in the AOD refining converter to finish the final smelting; and secondly, a long process is carried out, namely laterite-nickel ore is used as a main raw material, low-nickel molten iron is obtained through sintering and blast furnace processes, the low-nickel molten iron is further loaded into an AOD refining converter, and ferrochrome and electrolytic manganese are added into the AOD refining converter to finish final smelting.
In the traditional two-step method, the smelting of stainless steel scrap by an electric arc furnace has the defects of unsatisfactory yield and high investment and operation cost. The traditional 'long flow' process has the defects of long flow, high investment cost, long construction period and more discharged wastes.
Disclosure of Invention
The invention aims to provide an economical chromium manganese stainless steel smelting production method and system aiming at the defects of the prior art.
Specifically, the economical smelting production method of the chromium-manganese stainless steel comprises the following steps:
(1) adding stainless steel scrap into an alloy melting furnace, and electrifying and melting to obtain stainless steel mother liquor;
(2) sampling and analyzing the stainless steel mother liquor, and reporting the components to an AOD refining process;
(3) adding the stainless steel mother liquor into an AOD refining converter, and finishing decarburization and chromium protection and component adjustment by using a process control model to obtain stainless steel liquid;
(4) and transferring the stainless steel liquid to an LF ladle refining furnace, and carrying out continuous casting after slagging and desulfurization.
According to the economical smelting production method of the chromium-manganese stainless steel, the tapping temperature of the alloy melting furnace is more than or equal to 1500 ℃.
According to the economical smelting production method of the chromium-manganese stainless steel, the AOD refining process comprises a desiliconization stage, a decarburization stage, an alloying stage, a reduction stage and a deslagging and tapping stage.
In the above economical method for producing chromium manganese stainless steel by smelting, the desiliconization stage comprises: adding a slagging material into an AOD refining converter, blowing oxygen for smelting by side air, preferably, the working pressure of the oxygen-blown smelting is 1.0MPa, and the air supply intensity is 1.5-2.0 Nm3T/min, and the oxygen blowing time is 3-5 min.
The economic smelting production method of the chromium-manganese stainless steel comprises the decarburization stage: oxygen blowing is carried out at a side blowing port of the AOD refining converter, and inert gas is blown into the side blowing port; preferably, the pressure of the oxygen blowing and the inert gas blowing is 0.8 to 1.2MPa, and the gas supply intensity is 1.2 to 1.8Nm3T, and the gas supply time is 3-5 min.
The above economical production method for smelting chromium manganese series stainless steel comprises the alloying stage: and adding alloy in the AOD refining converter according to the sampling analysis result.
The above economical production method for smelting chromium-manganese stainless steel comprises the following reduction stages: adding ferrosilicon/silicomanganese alloy into the AOD refining converter, and blowing argon on the side; preferably, the pressure of the side argon gas is 0.8-1.2 MPa, and the time for side argon gas blowing is 10-15 min.
According to the economic smelting production method of the chromium-manganese stainless steel, the slagging and desulfurizing operation comprises the following steps: CaO and CaF are added into an LF ladle refining furnace2And ferrosilicon, bottom blowing argon; preferably, the pressure of the bottom blowing argon is 0.8-1.2 MPa, and the gas supply intensity is 0.018Nm3/min·t～0.18Nm3The time of bottom blowing argon is 12-18 min.
On the other hand, the invention also provides an economic chromium manganese series stainless steel smelting production system, which comprises:
the alloy melting furnace is used for melting the stainless steel scrap to obtain stainless steel mother liquor;
the AOD refining converter is used for refining the stainless steel mother liquor to obtain stainless steel liquid with qualified components;
the LF ladle refining furnace is used for adjusting the temperature and the components of the stainless steel liquid;
the continuous casting machine is used for casting the stainless steel liquid into a casting blank;
and transferring the stainless steel mother liquor and the stainless steel liquid among the alloy melting furnace, the AOD refining converter, the LF ladle refining furnace and the continuous casting machine through ladles.
In the economical chromium-manganese stainless steel smelting production system, the alloy melting furnaces are 40t alloy melting furnaces, and the number of the alloy melting furnaces is 4; the AOD refining converter is a 50t AOD refining converter, and the number of the AOD refining converters is 2; the LF ladle refining furnace is a 50t LF ladle refining furnace, and the number of the LF ladle refining furnaces is 1; the continuous casting machine is a 2-machine 2-flow small slab continuous casting machine, and the number of the continuous casting machines is 1.
Compared with the traditional two-step method, namely 'electric arc furnace + AOD' process, the method has the following technical advantages:
(1) the yield of the alloy melting furnace elements is better than that of an electric arc furnace, and the advantages of saving steel materials and alloy cost are obvious. For 200 series stainless steel scraps, 202 steel is taken as an example, and the main alloy elements and the contents thereof are respectively Cr: 17% -19%, Ni: 4.0% -6.0%, Mn: 7.5 to 10.0 percent. The yields of these elements in the alloy melting furnace and arc furnace are shown in Table 2.
TABLE 2 elemental yields for two smelting modes
| Element(s) | Cr | Ni | Mn | Fe |
| Alloy melting furnace | 94％～98％ | 98％～100％ | 94％～97％ | 97％～98％ |
| Average value of the middle limit | 96％ | 99％ | 95.5％ | 97.5％ |
| Electric arc furnace | 90％～95％ | 95％～98％ | 30％～40％ | 90％～93％ |
| Average value of the middle limit | 92.5％ | 96.5％ | 35％ | 91.5％ |
As can be seen from table 2, the yield of manganese metal from the alloy melting furnace is about 60% higher than that from the electric arc furnace. The electrolytic manganese is calculated according to the market price of 12000 yuan/ton, 1 ton of 200 series stainless steel scrap is melted (the Mn content is considered according to 8 percent), and the melting furnace of manganese element-alloy saves 576 yuan compared with an electric arc furnace.
The yield of the metal nickel of the alloy melting furnace is about 2.5 percent higher than that of an electric arc furnace. The electrolytic nickel is calculated according to the market price of 73000 yuan/ton, 1 ton of 200 series stainless steel scrap is melted (the Ni content is considered according to 5 percent), and the melting furnace of the nickel element-alloy saves the cost by 91.25 yuan compared with an electric arc furnace.
The yield of the chromium metal of the alloy melting furnace is about 3.5 percent higher than that of an electric arc furnace. Ferrochrome (containing Cr: 50%) is calculated according to market price 6500 yuan/ton, 1 ton of 200 series stainless steel scrap is melted (the Cr content is considered according to 18%), and the melting furnace of chromium element-alloy saves cost by 81.9 yuan compared with an electric arc furnace.
1 ton of 200 series stainless steel scrap is melted, and the cost of the three alloy elements is saved by about 750 yuan compared with an electric arc furnace in the aspect of alloy yield.
(2) The alloy melting furnace has short construction period and lower investment cost than an electric arc furnace. Compared with the investment of a 60t electric arc furnace and a 60t alloy melting furnace, the former is higher than the latter by more than 30 percent.
(3) The comprehensive operation cost of the alloy melting furnace is lower than that of an electric arc furnace. The comprehensive operation cost mainly comprises: consumption of steel materials, comprehensive power consumption, electrode consumption (no electrode consumption of an alloy melting furnace), consumption of refractory materials, consumption of auxiliary raw materials, consumption of power energy media, spare parts and the like. For the smelting of all scrap steel, the energy consumption of each ton of steel in the electric arc furnace is about 570 kW.h, and the energy is mainly provided by chemical energy, electric energy and natural gas combustion. The consumed energy is mainly used for melting scrap steel and heating molten steel, the heat efficiency reaches about 68.5%, the rest energy loss is physical heat, iron loss physical heat, transformer short net heat loss and furnace body heat dissipation loss which are taken away by slag, furnace gas, smoke dust and the like, and the electric energy input is about 370-380 kW & h. The electric energy consumed by the alloy melting furnace for melting the scrap steel is mainly used for heating the scrap steel, heat taken away by cooling water of an induction coil, energy loss generated on a power supply line, metal radiation loss, heat storage of a furnace lining and the like, the power consumption per ton of steel is about 550-580 kW.h, and the thermal efficiency is about 63% -70%.
From the above analysis, it is found that the thermal efficiency of both the alloy melting furnace and the electric arc furnace is substantially equal, and the energy consumed for melting 1t of scrap is also substantially the same.
(4) Compared with an electric arc furnace, the alloy melting furnace has small impact on a power grid and stable operation.
Compared with the traditional 'long flow' process, the invention has the following technical advantages:
(1) the production process of the invention conforms to the concepts of energy conservation and emission reduction, circular economy development and sustainable development realization of the steel industry, and is consistent with the policy and policy of low emission of the steel industry advocated by the state.
(2) The invention has the advantages of less production process investment, short construction period and environmental protection, namely: has more superiority in the aspects of investment, efficiency and environmental protection.
(3) At present, the price of 200 series stainless steel scrap is lower, so that the short-flow production cost and the longer flow have more market competitiveness.
(4) The invention saves a raw material yard (a raw material treatment process and the stockpiling of iron ore powder, coke and the like), a sintering process, a blast furnace process and a matched coking process, saves the occupied area and greatly reduces the discharge of waste gas and dust at the same time. According to related calculation, 1 ton of waste steel is used, the consumption of 1.7 tons of concentrate can be reduced, 60% of energy and 40% of fresh water are saved compared with that of pig iron, and the discharged waste gas, the waste water, the waste residue and the solid emission (containing waste rocks and tailings of a mine part) can be reduced by 86%, 76% and 72% respectively.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
FIG. 1 is a process layout diagram of an economical chromium manganese series stainless steel smelting production system of the present invention;
description of the symbols: the steel ladle refining furnace comprises an alloy melting furnace 1, a ladle car 2, an AOD refining converter 3, an LF ladle refining furnace 4, a continuous casting machine 5, a scrap steel trough 6, a storage bin 7, a casting crane 8, a bridge crane 9, a feeding trolley 10, a cross car 11, a grab bucket/disk crane 12 and an AOD furnace building area 13.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention. The process of the present invention employs conventional methods or apparatus in the art, except as described below. The following noun terms have meanings commonly understood by those skilled in the art unless otherwise specified.
The terms "the," "said," "an," and "an" as used herein do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item. In addition, all ranges disclosed herein are inclusive of the endpoints and independently combinable.
Specifically, the economical smelting production method of the chromium-manganese stainless steel comprises the following steps:
(1) adding stainless steel scrap into an alloy melting furnace, and electrifying and melting to obtain stainless steel mother liquor;
(2) sampling and analyzing the stainless steel mother liquor, and reporting the components to an AOD refining process;
(3) adding the stainless steel mother liquor into an AOD refining converter, and finishing decarburization and chromium protection and component adjustment by using a process control model to obtain stainless steel liquid;
(4) and transferring the stainless steel liquid to an LF ladle refining furnace, and carrying out continuous casting after slagging and desulfurization.
The economical smelting production method of the chromium-manganese stainless steel has the advantages of high element yield, low investment and operation cost, energy conservation and emission reduction, and accordance with the sustainable development concept.
In some preferred embodiments, the invention relates to an economical chromium manganese series stainless steel smelting production method, which comprises the following steps:
(1) adding stainless steel scrap into an alloy melting furnace, and electrifying and melting to obtain stainless steel mother liquor.
Preferably, the stainless steel scrap is packed and compacted and then is added into an alloy melting furnace through a platform feeding trolley. During charging, the limit that molten steel does not exceed 80% of the furnace volume after melting is taken as a limit, the melting condition in the furnace needs to be observed in the process, and the charging can be timely carried out before the metal furnace burden is completely melted.
Preferably, the stainless steel scrap is a single series stainless steel scrap, such as a 200 series stainless steel scrap. As the raw material is single series of stainless steel scrap, a small part of semi-steel liquid can be left at the bottom of each furnace when tapping, which is beneficial to the high power input in the next furnace melting process from the beginning, so as to shorten the melting time of metal furnace burden.
Preferably, the alloy melting furnace is electrified for melting for about 100min (according to the configuration principle of a transformer of the intermediate frequency furnace, the ton steel power is 800-1000 kVA), and semi-steel can be produced after the melting temperature is more than or equal to 1550 ℃.
(2) Sampling and analyzing the stainless steel mother liquor, and reporting the components to an AOD refining process.
(3) And (3) adding the stainless steel mother liquor into an AOD refining converter, and finishing decarburization and chromium protection and component adjustment by using a process control model to obtain the stainless steel liquid.
The AOD refining process comprises a desiliconization stage, a decarburization stage, an alloying stage, a reduction stage and a deslagging and tapping stage.
Taking 200 series stainless steel scrap as an example, 200 series stainless steel scrap contains about 1% of silicon element (Si), and after being melted by an alloy melting furnace, about 0.8% -0.9% of silicon element still exists. Therefore, the silicon element in the stainless steel mother liquor needs to be removed to a trace amount through a desiliconization stage.
Specifically, the desilication stage comprises: adding a slagging material into an AOD refining converter, blowing oxygen for smelting by side air, preferably, the working pressure of the oxygen-blown smelting is 1.0MPa, and the air supply intensity is 1.5-2.0 Nm3T/min, and the oxygen blowing time is 3-5 min.
Wherein, the slagging material is lime, dolomite, fluorite.
Wherein the decarbonization phase comprises: oxygen blowing is carried out at a side blowing port of the AOD refining converter, and inert gas is blown into the side blowing port; preferably, the pressure of the oxygen blowing and the inert gas blowing is 0.8 to 1.2MPa, and the gas supply intensity is 1.2 to 1.8Nm3T, and the gas supply time is 3-5 min.
Wherein the inert gas is nitrogen.
And (3) adding alloy in the AOD refining converter according to the specific steel type to be smelted and the stainless steel mother liquor component provided in the step (2). Optionally, the additional alloy may be high carbon ferrochrome, ferronickel, or the like.
In a preferred embodiment, taking 200 series stainless steel scrap as an example, the alloying stage comprises: high-carbon ferrochrome and ferronickel are added into the AOD refining converter from a furnace mouth through a high-level bunker or a trough, and the adding amount of the high-carbon ferrochrome and the ferronickel is respectively 10kg/t steel (Cr: 52%) and 5kg/t steel (N: 5%).
After the components of the stainless steel liquid are adjusted to be qualified in the alloying stage, the reduction operation is carried out. Specifically, ferrosilicon/silicomanganese alloy is added into an AOD refining converter from a furnace mouth through an overhead bunker or a trough, the adding amount is 30kg/t steel (Si: 74%), argon is blown through a side blowing port of the AOD refining converter, the pressure of the side blowing argon is about 0.8-1.2 MPa, the argon blowing time is about 10-15 min, and Cr and Mn elements (Cr is used as elements) in slag are oxidized2O3MnO in the form of MnO in the slag) is reduced into the molten steel. Wherein the consumption of the full ferrosilicon per ton of steel is about 30 kg.
(4) And transferring the stainless steel liquid to an LF ladle refining furnace, and carrying out continuous casting after slagging and desulfurization.
Wherein more than 90% of steel slag in the AOD refining converter is removed before the stainless steel liquid is transferred to the LF ladle refining converter from the AOD refining converter.
The slagging and desulfurizing operation comprises the following steps: CaO and CaF are added into an LF ladle refining furnace2And ferrosilicon, bottom blowing argon; preferably, the pressure of the bottom blowing argon is 0.8-1.2 MPa forGas strength of 0.018Nm3/min·t～0.18Nm3The time of bottom blowing argon is 12-18 min.
According to the invention, the LF ladle refining furnace is arranged, and the temperature of molten steel is adjusted by means of the electrical heating function of the LF ladle refining furnace, so that the requirements of subsequent continuous casting procedures are met; meanwhile, the LF ladle refining furnace can flexibly coordinate the production rhythm between the AOD refining converter and the continuous casting machine, and plays a role in buffering and adjusting between the AOD refining converter and the continuous casting machine.
On the other hand, as shown in fig. 1, the economical chromium manganese series stainless steel smelting production system comprises:
the alloy melting furnace 1 is used for melting stainless steel scrap to obtain stainless steel mother liquor;
the AOD refining converter 3 is used for refining the stainless steel mother liquor to obtain stainless steel liquid with qualified components;
an LF ladle refining furnace 4 for adjusting the temperature and components of the stainless steel liquid;
a continuous casting machine 5 for casting the stainless steel liquid into a casting blank;
and transferring the stainless steel mother liquor and the stainless steel liquid among the alloy melting furnace, the AOD refining converter, the LF ladle refining furnace and the continuous casting machine through ladles.
Preferably, in the economical chromium manganese stainless steel smelting production system, the alloy melting furnace 1 is a 40t alloy melting furnace, and the number of the alloy melting furnaces is 4; the AOD refining converter 3 is a 50t AOD refining converter, and the number of the AOD refining converters is 2; the LF ladle refining furnace 4 is a 50t LF ladle refining furnace, and the number of the LF ladle refining furnaces is 1; the continuous casting machine 5 is a 2-machine 2-flow small slab continuous casting machine, and the number of the continuous casting machines is 1.
In order to better understand the invention, the economical chromium manganese series stainless steel smelting production method and the system thereof are described in detail below by combining with actual working conditions.
(1) Main raw materials
Recovered 200 series stainless steel processing leftover materials, waste plate/pipe materials, waste decorative materials and the like;
(2) main equipment
4 sets of 40t alloy melting furnace 1 (one-to-two type, transformer capacity 35 MVA): the method is used for melting 200 series stainless steel scraps.
2-seat 50t AOD refining converter 3 (no top lance system, only side blow port): is used for smelting qualified stainless steel liquid.
1 seat 50t LF ladle refining furnace 4: is used for adjusting the temperature and the components of the stainless steel liquid.
1, 2-machine 2-flow small slab caster 5: used for producing qualified stainless steel slabs.
The alloy melting furnace 1, the AOD refining converter 3, the LF ladle refining furnace 4 and the slab caster 5 are arranged in the same span, and a process layout diagram (figure 1) is shown.
(3) Detailed process
Waste steel required by the alloy melting furnace 1 is loaded into an alloy melting furnace feeding trolley 10 through a grab bucket/magnetic disk crane 12, stainless steel waste is loaded into the furnace through the alloy melting furnace feeding trolley 10 and starts to be electrified and melted, and the waste steel can be fed into the furnace for 2-3 times in the melting process; after melting, the tapping temperature of an alloy melting furnace 1 is more than or equal to 1500 ℃, stainless steel mother liquor is poured into a ladle through an alloy melting furnace tilting mechanism, the stainless steel mother liquor is transported to the front of an AOD refining converter 3 through a ladle car 2, 120/32t of casting crane 8 is used for adding the stainless steel mother liquor in the ladle into the AOD refining converter 3, waste steel required by the AOD refining converter 3 is transported into a smelting span through a raw material span by a cross car 11 after raw material span batching, the waste steel is added into the AOD refining converter 3 through a waste steel trough 6 by a bridge crane 9, desiliconization, component adjustment, reduction and other operations are carried out by combining air port side blowing, required alloy is added into a storage bin 7 in the smelting process, and then smelting of 200 series stainless steel is completed.
The AOD refining converter 3 discharges steel into a lower ladle through a converter mouth in a steel and slag mixing mode, after upper steel slag of molten steel is removed through a slag raking machine, the ladle is transferred into the LF ladle refining furnace 4 through an 120/32t casting crane 8 for slagging, desulfurization and refining operation, and after refining is completed, the ladle is hoisted to a ladle revolving platform of a continuous casting machine 5 through the 120/32t casting crane 8 for pouring operation.
When the AOD refining converter smelts about 70-90 furnaces (the service life of one furnace is between 70-90 furnaces), the AOD converter needs to be replaced due to the erosion of the refractory material of the furnace lining, the original furnace lining is removed, and a new furnace lining is built. The smelting cross 120/32t casting crane 8 hoists the AOD refining converter 3 body to the furnace dismantling position of the AOD furnace building area 13, the furnace dismantling machine removes the original furnace lining, then the crane hoists to the building position, and the furnace lining is baked for standby after the building is completed.
(4) Application conditions
200 series stainless steel scrap is used as a main raw material, and high-carbon ferrochrome, electrolytic nickel and electrolytic manganese are properly added.
(5) Consumption index
Lime: 130kg/t steel; fluorite: 30kg/t steel; ferrochrome: 10kg/t steel; ferronickel: 5kg/t steel; silicon iron: 30kg/t steel; oxygen: 30m3Steel,/t; nitrogen gas: 4m3Steel,/t; argon gas: 4m3Steel/t.
The present invention has been disclosed in the foregoing in terms of preferred embodiments, but it will be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention. It should be noted that all changes and substitutions that are equivalent to these embodiments are deemed to be within the scope of the claims of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined in the claims.
Claims (10)
1. An economical smelting production method of chromium-manganese stainless steel is characterized by comprising the following steps:
(1) adding stainless steel scrap into an alloy melting furnace, and electrifying and melting to obtain stainless steel mother liquor;
(2) sampling and analyzing the stainless steel mother liquor, and reporting the components to an AOD refining process;
(3) adding the stainless steel mother liquor into an AOD refining converter, and finishing decarburization and chromium protection and component adjustment by using a process control model to obtain stainless steel liquid;
(4) and transferring the stainless steel liquid to an LF ladle refining furnace, and carrying out continuous casting after slagging and desulfurization.
2. The economical chromium manganese series stainless steel smelting production method according to claim 1, characterized in that the alloy melting furnace tapping temperature is more than or equal to 1500 ℃.
3. The economical chromium manganese series stainless steel smelting production method according to claim 1, wherein the AOD refining process includes a desiliconization stage, a decarburization stage, an alloying stage, a reduction stage and a deslagging tapping stage.
4. The economical chromium manganese series stainless steel smelting production method according to claim 3, characterized in that the desiliconization stage comprises: adding a slagging material into an AOD refining converter, blowing oxygen for smelting by side air, preferably, the working pressure of the oxygen-blown smelting is 1.0MPa, and the air supply intensity is 1.5-2.0 Nm3T/min, and the oxygen blowing time is 3-5 min.
5. The economical chromium manganese series stainless steel smelting production method according to claim 3, characterized in that the decarbonization stage comprises: oxygen blowing is carried out at a side blowing port of the AOD refining converter, and inert gas is blown into the side blowing port; preferably, the pressure of the oxygen blowing and the inert gas blowing is 0.8 to 1.2MPa, and the gas supply intensity is 1.2 to 1.8Nm3T, and the gas supply time is 3-5 min.
6. The economical chromium manganese stainless steel smelting production method of claim 3, wherein the alloying stage includes: and adding alloy in the AOD refining converter according to the sampling analysis result.
7. The economical chromium manganese series stainless steel smelting production method according to claim 3, characterized in that the reduction stage comprises: adding ferrosilicon/silicomanganese alloy into the AOD refining converter, and blowing argon on the side; preferably, the pressure of the side argon gas is 0.8-1.2 MPa, and the time for side argon gas blowing is 10-15 min.
8. The economical chromium manganese series stainless steel smelting production method according to any one of claims 1 to 7, characterized in that the slagging and desulfurizing operation bagComprises the following steps: CaO and CaF are added into an LF ladle refining furnace2And ferrosilicon, bottom blowing argon; preferably, the pressure of the bottom blowing argon is 0.8-1.2 MPa, and the gas supply intensity is 0.018Nm3/min·t～0.18Nm3The time of bottom blowing argon is 12-18 min.
9. An economical chromium manganese stainless steel smelting production system is characterized by comprising:
the alloy melting furnace is used for melting the stainless steel scrap to obtain stainless steel mother liquor;
the AOD refining converter is used for refining the stainless steel mother liquor to obtain stainless steel liquid with qualified components;
the LF ladle refining furnace is used for adjusting the temperature and the components of the stainless steel liquid;
the continuous casting machine is used for casting the stainless steel liquid into a casting blank;
and transferring the stainless steel mother liquor and the stainless steel liquid among the alloy melting furnace, the AOD refining converter, the LF ladle refining furnace and the continuous casting machine through ladles.
10. The economical chromium manganese series stainless steel smelting production system according to claim 9, wherein the alloy melting furnace is a 40t alloy melting furnace, and the number is 4; the AOD refining converter is a 50t AOD refining converter, and the number of the AOD refining converters is 2; the LF ladle refining furnace is a 50t LF ladle refining furnace, and the number of the LF ladle refining furnaces is 1; the continuous casting machine is a 2-machine 2-flow small slab continuous casting machine, and the number of the continuous casting machines is 1.
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