A method of converting high manganese steel in a converter

Abstract

The application relates to a method for smelting high-manganese steel in a converter, and belongs to the technical field of steelmaking. The technical problem to be solved by the application is that the manganese content of end-point molten steel produced by a converter in the prior art is low. The technical solution provided by the application for solving the above technical problem is that carbon balls and high-carbon ferromanganese are added in stages according to oxygen supply amount in the smelting process of the converter, when the oxygen supply amount is within 0-10% and 10-80%, 30% and 70% of manganese alloy are respectively added; and when the oxygen supply amount is within 0-10%, 10-50%, 50-80% and 80-100%, 20%, 40%, 30% and 10% of carbonaceous raw materials are respectively added. Compared with the current process for producing high-manganese steel in a converter, the application reduces the investment of alloy heating furnaces and other equipment, meets the production requirements of more varieties of high-manganese steel, improves the metal yield of manganese, shortens the production cycle, and reduces the production cost of high-manganese steel.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steelmaking, and particularly relates to a method for smelting high manganese steel in a converter. BACKGROUND

[0002] With the rapid development of China's industry, the mechanical equipment manufacturing industry gradually develops towards large scale, harsh application and high efficiency, which makes the requirement for the wear resistance of equipment materials increasingly high. Therefore, high manganese steel with excellent wear resistance and toughness is gradually paid more attention to.

[0003] The production mode of high manganese steel usually includes electric furnace production and converter production. The electric furnace production is not economical due to high cost and long cycle. The converter production needs to add a large amount of manganese alloy after the smelting in the converter is completed. Even if the measures such as increasing the converter tapping temperature or using an alloy heating furnace are taken, the problems such as alloy clumping, insufficient manganese alloy addition or increased equipment investment are easily caused, so it is difficult to meet the requirement for the high manganese content of the terminal molten steel.

[0004] Therefore, it is an urgent problem to find a converter smelting method capable of making the terminal molten steel contain high manganese content. SUMMARY

[0005] The present application provides a method for smelting high manganese steel in a converter, so as to solve the technical problem of low manganese content of the terminal molten steel in the converter production in the prior art.

[0006] In a first aspect, the present application provides a method for smelting high manganese steel in a converter, which comprises:

[0007] adding molten iron into the furnace under the condition of setting the ratio of the molten iron to the total charge;

[0008] adding carbon balls into the furnace in stages according to the oxygen blowing amount under the condition of setting the total amount of carbon balls;

[0009] adding high-carbon manganese iron into the furnace in stages according to the oxygen blowing amount under the condition of setting the total amount of high-carbon manganese iron;

[0010] tapping to obtain molten steel under the condition of setting the tapping temperature;

[0011] performing LF refining on the molten steel after tapping under the condition of setting the end temperature of LF refining;

[0012] performing RH refining on the molten steel after LF refining under the condition of setting the end temperature of RH refining.

[0013] Optionally, the ratio of the molten iron to the total charge is 1.

[0014] Optionally, the carbon balls contain iron oxide scale.

[0015] Optionally, the mill scale has a mesh value of 50-150.

[0016] Optionally, the carbon spheres have an average diameter of 30-60 mm.

[0017] Optionally, the total amount of the carbon spheres is 20-55 kg / t, and the total amount of the high-carbon ferromanganese is 100-400 kg / t.

[0018] Optionally, the carbon spheres are added to the furnace in stages according to the oxygen blowing amount, including:

[0019] 0%< oxygen blowing amount ≦10%, the ratio of the added carbon spheres to the total amount is 0.2;

[0020] 10%< oxygen blowing amount ≦50%, the ratio of the added carbon spheres to the total amount is 0.4;

[0021] 50%< oxygen blowing amount ≦80%, the ratio of the added carbon spheres to the total amount is 0.3;

[0022] 80%< oxygen blowing amount ≦100%, the ratio of the added carbon spheres to the total amount is 0.1.

[0023] Optionally, the high-carbon ferromanganese is added to the furnace in stages according to the oxygen blowing amount, including:

[0024] 0%< oxygen blowing amount ≦10%, the ratio of the added high-carbon ferromanganese to the total amount is 0.3;

[0025] 10%< oxygen blowing amount ≦50%, the ratio of the added high-carbon ferromanganese to the total amount is 0.5;

[0026] 50%< oxygen blowing amount ≦80%, the ratio of the added high-carbon ferromanganese to the total amount is 0.2.

[0027] Optionally, the tapping temperature is set to 1640-1660℃.

[0028] Optionally, the LF refining end temperature is set to 1585-1610℃; and / or

[0029] the RH refining end temperature is set to 1550-1565℃.

[0030] Compared with the prior art, the above technical solution provided by the embodiments of the present application has the following advantages:

[0031] The method provided by the embodiment of the application can control the terminal manganese content of the converter to be between 15% and 25% by adding carbon balls and high-carbon ferromanganese in stages according to the oxygen blowing amount in the converter smelting process, and adding 30% and 70% of manganese alloy when the oxygen supply amount is in the two stages of 0-10% and 10-80% respectively, and adding 20%, 40%, 30% and 10% of carbonaceous raw materials when the oxygen supply amount is in the stages of 0-10%, 10-50%, 50-80% and 80-100% respectively, thereby effectively improving the metal yield of manganese and ensuring that the terminal molten steel has a high manganese content. BRIEF DESCRIPTION OF DRAWINGS

[0032] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, for those of ordinary skill in the art, the other drawings can be obtained based on these drawings without any creative effort.

[0034] Figure 1 A flowchart of a method for smelting high-manganese steel in a converter provided by the embodiment of the application. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions and advantages of the embodiments of the application clearer, the technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without any creative effort fall within the protection scope of the application.

[0036] Unless otherwise specified, the various raw materials, reagents, instruments and equipment and the like used in the application can be purchased from the market or can be prepared by the existing method.

[0037] Various embodiments of the present application can exist in a range of forms; it should be understood that the description in a range form is merely for the convenience and brevity, and should not be understood as a hard limitation on the scope of the present application; therefore, it should be considered that the range described has been specifically disclosed all possible sub-ranges and single values within the range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. In addition, whenever a numerical range is indicated herein, it refers to any cited number (fraction or integer) within the indicated range.

[0038] In the present application, the orientation words such as "upper" and "lower" are specifically the directions of the drawing surface in the drawings, unless otherwise stated. In addition, in the description of the specification of the present application, the terms "include", "contain" and the like mean "include but are not limited to".

[0039] In the present application, the relationship terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. In the present application, "and / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the cases of A alone, A and B together, and B alone. Wherein A and B can be singular or plural. In the present application, "at least one" means one or more, and "multiple" means two or more. "At least one", "at least one of the following" or the like means any combination of the items, including single item or any combination of multiple items. For example, "at least one of a, b, or c", or "at least one of a, b, and c", can represent a, b, c, a-b (i.e. a and b), a-c, b-c, or a-b-c, wherein a, b, and c can be single or multiple.

[0040] The technical scheme provided by the embodiments of the present application is to solve the above technical problems, and the overall idea provided is as follows:

[0041] In a first aspect, the present application provides a method for smelting high manganese steel in a converter, the method comprising:

[0042] Under the condition of setting the ratio of molten iron to total charge, molten iron is added to the furnace;

[0043] Under the condition of setting the total amount of carbon balls, carbon balls are added to the furnace in stages according to the oxygen blowing amount;

[0044] Under the condition of setting the total addition amount of high-carbon ferromanganese, high-carbon ferromanganese is added to the furnace in stages according to the oxygen blowing amount;

[0045] Under the condition of setting the tapping temperature, molten steel is obtained by tapping;

[0046] Under the condition of setting the LF refining end temperature, the molten steel after tapping is subjected to LF refining;

[0047] Under the condition of setting the RH refining end temperature, the molten steel after LF refining is subjected to RH refining.

[0048] In the present embodiment, the method for smelting high-manganese steel in a converter mainly includes the following steps: preparing carbon balls, converter smelting, converter tapping, LF refining, and RH refining. The preparation of carbon balls mainly includes: crushing coke, lime, and iron oxide scale into powder, mixing them uniformly, and pressing into carbon balls.

[0049] In the present embodiment, the reasons for using carbon balls are as follows: first, to ensure that the molten iron has a high carbon content, so that MnO can be reduced to metallic manganese; second, to facilitate the addition to the converter; third, to reduce carbon combustion; and fourth, to reduce the dust content of the converter flue gas.

[0050] In the present embodiment, in the converter smelting step, in order to ensure the kinetic conditions of the molten iron and facilitate the carbon reduction of manganese oxide in the furnace, the top blowing oxygen supply intensity needs to be controlled between 3.5 m 3 / t·min and 3.8 Nm 3 / t·min, and the bottom blowing gas supply intensity needs to be controlled between 0.85 m 3 / t·min and 0.10 Nm 3 / t·min, which helps to improve the flowability of the converter bath and improve the kinetic conditions of the high-temperature metal melt.

[0051] In the converter tapping step in the present embodiment, the mass fraction of Mn in the molten steel after tapping needs to be controlled to be 15%-25%, and the mass fraction of C needs to be controlled to be 2.0%-2.2%. The Mn mass fraction is controlled in this range to meet the product requirements, and the carbon is controlled in this range to ensure that there is enough carbon in the molten bath during the converter smelting process to reduce the manganese oxide in the slag, thereby obtaining a high final Mn content.

[0052] In the LF refining step in the present embodiment, in order to desulfurize, the LF refining period needs to be controlled to be 15 min-20 min; the Mn content after LF refining needs to be controlled to be 15%-25%; and the C content after LF refining needs to be controlled to be 1.6%-1.8%.

[0053] In the RH refining step in the present embodiment, the RH deep vacuum degassing time is controlled to be ≥20 min; the mass fraction of C in the molten steel after the end of the RH refining is controlled to be 0.35%-0.45%; and the mass fraction of Mn in the molten steel after the end of the RH refining is controlled to be 15%-25%.

[0054] In some embodiments, the ratio of the molten iron charged to the total charge is 1.

[0055] In the present embodiment, the molten iron charged accounts for 100% of the total charge, i.e., only the molten iron is added to ensure the heat abundance of the converter.

[0056] In some embodiments, the carbon balls contain iron oxide scale.

[0057] In the present embodiment, the beneficial component of the carbon balls is carbon, and the iron oxide is present for slagging. Direct addition of carbon and iron oxide is also possible, but direct addition of carbon will affect the stability of the converter smelting to some extent. Therefore, the form of the carbon balls containing iron oxide scale is selected, the presence of a high proportion of carbon helps to reduce the manganese oxide in the furnace, and the presence of iron oxide helps to slag and improve the fluidity of the slag.

[0058] In some embodiments, the mesh value of the iron oxide scale is 50-150.

[0059] In the present embodiment, the mesh value of the iron oxide scale is controlled to be 50-150, and further can be 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150. This range of mesh values helps to press the balls and further improves the utilization rate of iron oxide.

[0060] In some embodiments, the average diameter of the carbon balls is 30-60 mm.

[0061] In the present embodiment, the average diameter of the carbon balls is 30-60 mm, and further can be 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60 mm. This range of average diameters can help with transportation and ensure that the carbon balls have a certain strength and reduce pulverization.

[0062] In some embodiments, the total addition amount of the carbon balls is 20-55 kg / t, and the total addition amount of the high-carbon ferromanganese is 100-400 kg / t.

[0063] In the embodiment, the total amount of carbon balls is 20 kg / t-55 kg / t, and can be 20 kg / t, 21 kg / t,

[0064] 22 kg / t, 23 kg / t, 24 kg / t, 25 kg / t, 26 kg / t, 27 kg / t, 28 kg / t, 29 kg / t, 30 kg / t, 31 kg / t,

[0065] 32 kg / t, 33 kg / t, 34 kg / t, 35 kg / t, 36 kg / t, 37 kg / t, 38 kg / t, 39 kg / t, 40 kg / t, 41 kg / t,

[0066] 42 kg / t, 43 kg / t, 44 kg / t, 45 kg / t, 46 kg / t, 47 kg / t, 48 kg / t, 49 kg / t, 50 kg / t, 51 kg / t,

[0067] 52 kg / t, 53 kg / t, 54 kg / t, 55 kg / t. The carbon balls can increase the mass fraction of carbon in the molten iron, thereby promoting the reaction of carbon and manganese oxide, and increasing the mass fraction of Mn in the molten steel. The reason for adding high-carbon ferromanganese is to ensure that the final molten steel has a high manganese content, and to ensure that the high-carbon ferromanganese is fully melted and that the oxidation of manganese in the furnace is reduced. High-carbon ferromanganese can ensure that sufficient manganese oxide is produced in the furnace, thereby meeting the carbon reduction of manganese oxide reaction process.

[0068] In some embodiments, the carbon balls are added to the furnace in stages according to the amount of oxygen blown, including:

[0069] 0%< oxygen blowing amount ≦10%, the ratio of the added carbon balls to the total amount is 0.2;

[0070] 10%< oxygen blowing amount ≦50%, the ratio of the added carbon balls to the total amount is 0.4;

[0071] 50%< oxygen blowing amount ≦80%, the ratio of the added carbon balls to the total amount is 0.3;

[0072] 80%< oxygen blowing amount ≦100%, the ratio of the added carbon balls to the total amount is 0.1.

[0073] In the embodiment, when the oxygen blowing is less than 10%, the temperature in the converter is low, and if a large amount of carbon balls is added, it will inevitably affect the slagging process, therefore 20% of the carbon balls are added.

[0074] In the process of blowing oxygen 10%-50% and 50-80%, a large amount of iron oxide has been produced in the furnace and the temperature is high, therefore, adding carbon balls at this time not only helps the melting of carbon balls, but also helps the carbon reduction of manganese oxide reaction in the furnace.

[0075] In the process of blowing oxygen 80%-100%, the temperature in the furnace is high, and the main reaction of carbon balls is combustion reaction, at this time, if a large amount of carbon balls is added, it cannot effectively increase the carbon content in the molten steel, therefore, the amount of added carbon balls is less.

[0076] In some embodiments, the high-carbon ferromanganese is added to the furnace in stages according to the amount of oxygen blown, comprising:

[0077] 0%< oxygen blowing amount ≦10%, the ratio of high-carbon ferromanganese added to the total amount is 0.3;

[0078] 10%< oxygen blowing amount ≦50%, the ratio of high-carbon ferromanganese added to the total amount is 0.5;

[0079] 50%< oxygen blowing amount ≦80%, the ratio of high-carbon ferromanganese added to the total amount is 0.2.

[0080] In this embodiment, in the process of blowing oxygen less than 10%, the temperature in the furnace is low, therefore, if a large amount of high-carbon ferromanganese is added, it will be difficult to melt, and it will affect the progress of other chemical reactions in the furnace.

[0081] In the process of blowing oxygen 10%-50%, the temperature in the furnace is high, a large amount of high-carbon ferromanganese can be added, but in order to ensure that the high-carbon ferromanganese can be quickly melted, therefore, 50% of high-carbon ferromanganese is selected to be added.

[0082] In the process of blowing oxygen 50%-80%, at this time, the carbon content of the molten steel is relatively reduced, therefore, if a large amount of high-carbon ferromanganese is added, the proportion of carbon reduction of manganese oxide is not high, therefore, in order to improve the utilization rate of high-carbon ferromanganese, relatively less is added at this time.

[0083] In some embodiments, the tapping temperature is set to 1640℃-1660℃.

[0084] In this embodiment, the tapping temperature is controlled to be 1640℃-1660℃, further, it can be 1640℃, 1641℃, 1642℃, 1643℃, 1644℃, 1645℃, 1646℃, 1647℃, 1648℃, 1649℃, 1650℃, 1651℃, 1652℃, 1653℃, 1654℃, 1655℃, 1656℃, 1657℃, 1658℃, 1659℃, 1660℃, this temperature range can not only ensure the smooth progress of the whole production process, but also help to improve the carbon reduction of manganese oxide reaction, so as to obtain high final Mn content.

[0085] In some embodiments, the LF refining end temperature is set to 1585-1610℃; and / or

[0086] The RH refining end temperature is set to 1550-1565℃.

[0087] In the present embodiment, the LF refining end temperature is controlled to 1585-1610℃, and further can be 1585℃, 1586℃, 1587℃, 1588℃, 1589℃, 1590℃, 1591℃, 1592℃, 1593℃, 1594℃, 1595℃, 1596℃, 1597℃, 1598℃, 1599℃, 1600℃, 1601℃, 1602℃, 1603℃, 1604℃, 1605℃, 1606℃, 1607℃, 1608℃, 1609℃, 1610℃, which can ensure normal temperature drop in the LF process, thereby obtaining the LF outlet temperature. The RH refining end temperature is controlled to 1550-1565℃, and further can be 1550℃, 1551℃, 1552℃, 1553℃, 1554℃, 1555℃, 1556℃, 1557℃, 1558℃, 1559℃, 1560℃, 1561℃, 1562℃, 1563℃, 1564℃, 1565℃, which can ensure sufficient superheat in the pouring process, thereby ensuring smooth continuous casting process.

[0088] The present application will be further described in conjunction with specific examples. It should be understood that these examples are only used to illustrate the present application and not used to limit the scope of the present application. The experimental methods in the following examples, if not specified, are generally determined according to national standards. If there is no corresponding national standard, the general international standards, conventional conditions, or the conditions suggested by the manufacturer are used.

[0089] The following examples use 210 tons top and bottom combined blown converter, RH furnace for smelting.

[0090] Example 1

[0091] (1) Carbon powder, 50 mesh iron oxide scale and lime powder are mixed in a mass ratio of 7:2:1;

[0092] (2) The mixture in (1) is pressed into a carbon ball of 30mm;

[0093] (3) The molten iron amount is 190t;

[0094] (4) In the converter blowing process, the top blowing oxygen supply intensity is controlled to 3.5-3.8Nm 3between 0.85 and 0.10 Nm 3 between 0.85 and 0.10 Nm

[0095] (5) adding 4 t of carbon balls;

[0096] (6) adding 48 t of high-carbon ferromanganese;

[0097] (7) sampling before tapping, the temperature of the molten steel is 1640℃, the end-point Mn content is 16.5%, and the end-point C content is 2.0%;

[0098] (8) the Mn content at the LF station is 16.3%; the LF refining period is 15 min, and the end-point temperature of the LF refining is 1590℃;

[0099] (9) the deep vacuum degassing time of the RH is 25 min, the end-point temperature of the RH refining is 1550℃, and the end-point Mn content is 15.7%.

[0100] Example 2

[0101] (1) mixing carbon powder, 80-mesh iron oxide scale and lime powder at a mass ratio of 7:2:1;

[0102] (2) pressing the mixture in (1) into carbon balls with a diameter of 45 mm;

[0103] (3) the amount of molten iron charged into the furnace is 200 t;

[0104] (4) during the blowing process of the converter, the top blowing oxygen intensity is controlled between 3.5 and 3.8 Nm 3 / t·min, and the bottom blowing gas intensity is controlled between 0.85 and 0.10 Nm 3 / t·min;

[0105] (5) adding 4.5 t of carbon balls;

[0106] (6) adding 61 t of manganese alloy;

[0107] (7) sampling before tapping, the temperature of the molten steel is 1640℃, the end-point Mn content is 20.1%, and the end-point C content is 2.1%;

[0108] (8) the Mn content at the LF station is 19.8%; the LF refining period is 17 min, and the end-point temperature of the LF refining is 1590℃;

[0109] (9) the deep vacuum degassing time of the RH is 20 min, the end-point temperature of the RH refining is 1550℃, and the end-point Mn content is 18.6%.

[0110] Example 3

[0111] (1) Carbon powder, 120 mesh iron oxide scale and lime powder were mixed in a mass ratio of 7:2:1;

[0112] (2) The mixture in (1) was pressed into carbon balls of 60 mm;

[0113] (3) The amount of molten iron charged into the furnace was 180 t;

[0114] (4) During the blowing process in the converter, the oxygen supply intensity of top blowing was controlled between 3.5-3.8 Nm 3 / t·min, and the gas supply intensity of bottom blowing was controlled between 0.85-0.10 Nm 3 / t·min;

[0115] (5) 5 t of carbon balls were added;

[0116] (6) 70 t of manganese alloy was added;

[0117] (7) Before tapping, the sample was taken, the temperature of the molten steel was 1640℃, the end point Mn content was 24.5%, and the end point C content was 2.2%;

[0118] (8) The Mn content at the LF station was 24.3%; the LF refining period was 20 min, and the end temperature of LF refining was 1590℃;

[0119] (9) The deep vacuum degassing time of RH was 28 min, the end temperature of RH refining was 1550℃, and the Mn mass fraction at the end of RH refining was 23.5%.

[0120] Comparative Example 1

[0121] (1) Carbon powder, 200 mesh iron oxide scale and lime powder were mixed in a mass ratio of 7:2:1;

[0122] (2) The mixture in (1) was pressed into carbon balls of 80 mm;

[0123] (3) The amount of molten iron charged into the furnace was 180 t;

[0124] (4) During the blowing process in the converter, the oxygen supply intensity of top blowing was controlled between 3.5-3.8 Nm 3 / t·min, and the gas supply intensity of bottom blowing was controlled between 0.85-0.10 Nm 3 / t·min;

[0125] (5) 4 t of carbon balls were added;

[0126] (6) 60 t of manganese alloy was added;

[0127] (7) Before tapping, the sample was taken, the temperature of the molten steel was 1600℃, the end point Mn content was 18%, and the end point C content was 1.2%;

[0128] (8) LF to station Mn content is 17.3%; LF refining cycle is 20 min, and the LF refining end temperature is 1570 DEG C;

[0129] (9) RH deep vacuum degassing time is 28 min, the RH refining end temperature is 1550 DEG C, and the RH refining end Mn mass fraction is 16.5%.

[0130] Comparative Example 2

[0131] (1) carbon powder, 20 mesh iron oxide scale and lime powder are mixed according to the mass ratio of 7:2:1;

[0132] (2) the mixture in (1) is pressed into a carbon ball of 20 mm;

[0133] (3) the molten iron quantity into the furnace is 160 t;

[0134] (4) in the converter blowing process, the top blowing oxygen supply intensity is controlled between 3.5-3.8 Nm 3 / t·min, and the bottom blowing gas supply intensity is controlled between 0.85-0.10 Nm 3 / t·min;

[0135] (5) 4 t of carbon ball is added;

[0136] (6) 60 t of manganese alloy is added;

[0137] (7) sampling before the converter tapping, the liquid steel temperature is 1610 DEG C, the end point Mn content is 13.5%, and the end point C content is 1.4%;

[0138] (8) LF to station Mn content is 12.7%; LF refining cycle is 20 min, and the LF refining end temperature is 1575 DEG C;

[0139] (9) RH deep vacuum degassing time is 28 min, the RH refining end temperature is 1550 DEG C, and the RH refining end Mn mass fraction is 11.5%.

[0140] In summary, the method for smelting high manganese steel by the converter provided by the application reduces the investment of alloy heating furnace and the like, effectively realizes high manganese content tapping, is suitable for smelting various high manganese steels by the converter, can effectively avoid the problems of alloy clumping or incomplete melting caused by adding manganese alloy in the ladle, adds manganese alloy and carbon ball in the converter smelting process, solves the problems of manganese alloying and high temperature tapping in the current converter production of high manganese steel, greatly shortens the processing cycle of the existing process for producing high manganese steel, the manganese content of the tapping is about 15%-25%, and efficient production of high manganese steel by the converter is realized.

[0141] Various embodiments of the application can exist in a variety of forms; it should be understood that the description of the embodiments as being in a specific form is merely for convenience and brevity and should not be construed to limit the scope of the application; therefore, the description of a specific form should be considered to have specifically disclosed all possible sub-combinations of the described form and individual numerical values within the described range. For example, a description of a range from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as individual numbers within the described range, such as 1, 2, 3, 4, 5, and 6, regardless of the form of the range. Additionally, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integral) within the indicated range.

[0142] In the present application, the orientation words such as "upper" and "lower" are specifically the directions of the drawing surface in the drawings unless otherwise stated. In addition, in the description of the present application, the terms "comprise", "include" and the like mean "including but not limited to".

[0143] In the present application, the relationship terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. In the present application, "and / or" describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the cases of A alone, A and B together, and B alone. Wherein A and B can be singular or plural. In the present application, "at least one" means one or more, and "multiple" means two or more. "At least one", "at least one of the following" or the like means any combination of the items, including any combination of single item or multiple items. For example, "at least one of a, b, or c", or "at least one of a, b, and c", can represent a, b, c, a-b (i.e. a and b), a-c, b-c, or a-b-c, wherein a, b, and c can be single or multiple.

[0144] The above description is only a specific embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications of these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A method of converting high manganese steel in a converter, characterized in that, The method comprises: adding molten iron into the furnace under the condition of setting the ratio of molten iron to total charge; adding carbon balls into the furnace in stages according to the oxygen blowing amount under the condition of setting the total amount of carbon balls, the carbon balls containing iron oxide scale, the average diameter of the carbon balls being 30 mm-60 mm, and the mesh number of the iron oxide scale being 50 mesh-150 mesh, for slagging and improving the fluidity of the slag; adding high-carbon ferromanganese into the furnace in stages according to the oxygen blowing amount under the condition of setting the total amount of high-carbon ferromanganese; tapping to obtain molten steel under the condition of setting the tapping temperature; carrying out LF refining on the molten steel after tapping under the condition of setting the end temperature of LF refining; carrying out RH refining on the molten steel after LF refining under the condition of setting the end temperature of RH refining; the adding of the carbon balls into the furnace in stages according to the oxygen blowing amount comprises: 0%< oxygen blowing amount ≦10%, the ratio of the added carbon balls to the total amount being 0.2; 10%< oxygen blowing amount ≦50%, the ratio of the added carbon balls to the total amount being 0.4; 50%< oxygen blowing amount ≦80%, the ratio of the added carbon balls to the total amount being 0.3; 80%< oxygen blowing amount ≦100%, the ratio of the added carbon balls to the total amount being 0.1; the adding of the high-carbon ferromanganese into the furnace in stages according to the oxygen blowing amount comprises: 0%< oxygen blowing amount ≦10%, the ratio of the added high-carbon ferromanganese to the total amount being 0.3; 10%< oxygen blowing amount ≦50%, the ratio of the added high-carbon ferromanganese to the total amount being 0.5; 50%< oxygen blowing amount ≦80%, the ratio of the added high-carbon ferromanganese to the total amount being 0.

2.

2. The method of claim 1, wherein, the ratio of the molten iron to the total charge is set to 1.

3. The method of claim 1, wherein, the total amount of the carbon balls is 20 kg / t-55 kg / t, and the total amount of the high-carbon ferromanganese is 100 kg / t-400 kg / t.

4. The method of claim 1, wherein, the tapping temperature is set to 1640 ℃-1660 ℃.

5. The method of claim 1, wherein, the end temperature of the LF refining is set to 1585 ℃-1610 ℃; and / or the end temperature of the RH refining is set to 1550 ℃-1565 ℃.

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