CN114959488B - Industrial pure iron medium plate and production method thereof - Google Patents

Industrial pure iron medium plate and production method thereof Download PDF

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CN114959488B
CN114959488B CN202210682260.6A CN202210682260A CN114959488B CN 114959488 B CN114959488 B CN 114959488B CN 202210682260 A CN202210682260 A CN 202210682260A CN 114959488 B CN114959488 B CN 114959488B
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equal
rolling
pure iron
medium plate
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CN114959488A (en
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麻渊滔
贾超君
贾涛
仵文涛
杨明永
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Shanxi Taigang Stainless Steel Co Ltd
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Shanxi Taigang Stainless Steel Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B3/02—Rolling special iron alloys, e.g. stainless steel
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0242—Flattening; Dressing; Flexing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • C21D8/1222—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • C21D8/1238—Flattening; Dressing; Flexing
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B2015/0071—Levelling the rolled product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/20—Temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The application relates to an industrial pure iron medium plate and a production method thereof, belongs to the technical field of steel smelting, and solves the technical problems that rolling edge crack, stress crack, plate shape buckling and the like are easy to occur in the production process of different types of industrial pure iron medium plates. The solution scheme is as follows: an industrial pure iron medium plate and a production method thereof, wherein the production process route is as follows: molten iron pretreatment, converter smelting, RH vacuum refining, continuous casting, cutting of middle plate blanks, blank heating, high-pressure water dephosphorization, rolling, air cooling finishing and inspection of a cross warehouse. The blank heating process adopts a three-section heating furnace. The rolling process adopts a mode of high Wen Cuga +low-temperature finish rolling. In the air cooling finishing process step, aiming at the sheet material with the thickness of less than 50mm, adopting an air cooling and cold straightening mode to treat the sheet shape of the steel sheet; for the plates with the thickness of 50mm and above, the plate shape of the steel plate is processed by adopting a hot straightening and air cooling mode. The application has the characteristics of simple process flow, low process cost, high yield and the like.

Description

Industrial pure iron medium plate and production method thereof
Technical Field
The application belongs to the technical field of steel smelting, and particularly relates to an industrial pure iron medium plate and a production method thereof.
Background
The industrial pure iron is one kind of steel, and its chemical composition is mainly iron, its content is 99.50% -99.90%, carbon content is below 0.04%, and other elements are less and better. This steel, which is close to pure iron, is called industrial pure iron, because it is not actually true pure iron yet. Generally, the industrial pure iron is particularly soft, has particularly high toughness and good electromagnetic performance. The common industrial pure iron has two purposes, one uses the characteristic of high-purity iron of the material, and is mainly applied to smelting various high-temperature alloys and is raw material pure iron; the material is mainly applied to the electrical industry and is electromagnetic pure iron by utilizing the excellent electromagnetic performance characteristics of the material.
For reasons of improving material yield and the like, part of industrial pure iron is produced by adopting a mode of single rolling of a middle plate, and due to the characteristics of steel types of the pure iron and the production characteristics of a medium plate, the problems of rolling edge crack, stress crack, plate buckling and the like easily exist in the production process of the medium plate of the pure iron.
Disclosure of Invention
In order to overcome the defects of the prior art and solve the technical problems of easy occurrence of rolling edge crack, stress crack, plate shape buckling and the like in the production process of different types of industrial pure iron medium plates, the application provides an industrial pure iron medium plate and a production method thereof.
The application is realized by the following technical scheme.
The application provides an industrial pure iron medium plate, which comprises electromagnetic pure iron DT4, raw material pure iron YT01 and raw material pure iron YT2;
the electromagnetic pure iron DT4 medium plate comprises the following elements in percentage by weight: c is less than or equal to 0.005, si is less than or equal to 0.05, mn is 0.17-0.23, P is less than or equal to 0.015, S is less than or equal to 0.01, al: 0.45-0.65, cr is less than or equal to 0.05, ni is less than or equal to 0.05, cu is less than or equal to 0.05, and the balance is Fe and unavoidable impurities;
the raw material pure iron YT01 medium plate comprises the following elements in percentage by weight: c is less than or equal to 0.003, si is less than or equal to 0.01, mn is less than or equal to 0.02, P is less than or equal to 0.008, S is less than or equal to 0.004, al is less than or equal to 0.02, cr is less than or equal to 0.02, ni is less than or equal to 0.02, cu is less than or equal to 0.02, and the balance is Fe and unavoidable impurities;
the raw material pure iron YT2 medium plate comprises the following elements in percentage by weight: c is less than or equal to 0.008, si is less than or equal to 0.04, mn is less than or equal to 0.14, P is less than or equal to 0.012, S is less than or equal to 0.006, al is less than or equal to 0.05, cr is less than or equal to 0.02, ni is less than or equal to 0.02, cu is less than or equal to 0.05, and the balance is Fe and unavoidable impurities.
Because the S content is too high and exists in the iron-carbon alloy in the form of FeS, fe+FeS eutectic with low melting point is formed with iron to gather on a grain boundary during crystallization, and the Fe+FeS eutectic breaks along the grain boundary during rolling, particularly on two sides of a continuous casting billet, and rolling edge cracks are easy to occur on two sides of rolling. The S content in the molten iron is strictly controlled during smelting of the industrial pure iron, and meanwhile, as Mn element and S are easier to form high-melting-point MnS, the effect of solid S can be realized, so that the Mn element is internally controlled according to the characteristics of the medium plate, and the raw material pure iron YT01 and the Mn element component weight percentage are controlled according to 0.01-0.02% on the premise of meeting the standard; controlling the weight percentage of Mn element components of the raw material pure iron YT2 according to 0.05% -0.14%, and ensuring the Mn/S ratio to be more than 4 as much as possible; for the electromagnetic pure iron DT4, the use process of the material is required to ensure good machining performance, so that the Mn content is high and the material is controlled according to the range of 0.17-0.23%.
The production process of industrial pure iron medium plate includes the following steps: molten iron pretreatment, converter smelting, RH vacuum refining, continuous casting, cutting of middle plate blanks, blank heating, high-pressure water dephosphorization, rolling, air cooling finishing and inspection of a cross warehouse;
the blank heating process adopts a three-section heating furnace, the temperature of pure iron in a preheating section is less than or equal to 1100 ℃, the temperature of a heating section is set to 1200-1240 ℃, the temperature of a soaking section is set to 1220-1260 ℃, the total residence time is 9-11 min/10mm, and the target residence time is 10min/10mm;
the high-pressure water dephosphorization process comprises two dephosphorization steps, wherein the first dephosphorization step is performed before the initial rolling, and the second dephosphorization step is performed after the rough rolling mill is performed to obtain an intermediate billet;
the rolling process adopts a high Wen Cuga + low-temperature finish rolling mode, and as the pure iron can be converted into isomerides in the cooling process, gamma-Fe is converted into alpha-Fe at the temperature of about 900 ℃, the change of the unit cell volume is easy to generate higher tissue stress at a lower temperature, and rolling cracks can be formed in the subsequent rolling process. Therefore, the rolling process is designed to avoid the temperature as much as possible. Wherein: the initial rolling temperature of the roughing mill is more than or equal to 1100 ℃, and rapid rolling is performed under large pressure, so that the temperature of an intermediate billet of the roughing mill is ensured to be more than 950 ℃; the initial rolling temperature of the finishing mill is controlled below 850 ℃, and the final rolling temperature is more than or equal to 750 ℃, so that the rolled plate shape is ensured, and the edge of the steel plate is prevented from cracking when the rolling temperature is low; in order to prevent edge cracking, the roughing mill is used for rolling in a stretching longitudinal rolling mode, and the stretching amount is 90mm;
in the air cooling finishing process step, because of the characteristic of low yield strength of the pure iron middle plate, aiming at the specification plate with the thickness of less than 50mm, the steel plate shape is processed in an air cooling and cold straightening mode, namely, the steel drawing operation is carried out after the air cooling is carried out on a cooling bed to the target temperature of below 300 ℃, and then the steel plate is subjected to cold straightening and leveling; for the plates with the thickness of 50mm and above, the plate shape of the steel plate is processed in a hot straightening and air cooling mode, namely, the internal stress in the rolling process of the steel plate is removed by adopting three reciprocating hot straightening, the plate is taken down after being cooled to the temperature below 200 ℃ on a cooling bed, and the deformation of the steel plate in the lifting process is prevented.
Further, in the rolling process, if the Mn/S ratio of the pure iron YT01 medium plate as the rolling raw material is smaller than 4, the widening target is adjusted to 110mm.
According to the application, the Mn element is controlled according to the characteristics of medium plates made of different materials, and the adjustment of the widening target according to the Mn-S ratio in the rolling process can solve the problem that the sizes of steel plates are not matched due to edge cracking, so that the yield is improved; the method of high Wen Cuga low-temperature finish rolling effectively relieves the cracking problem of the steel plate caused by red brittleness; the cooling and straightening processes are formulated according to different specifications, so that the problem of deformation of the rolled steel plate in the lifting process can be effectively avoided, and the steel plate shape in the delivery state can be ensured to meet the user requirement. The hot rolling comprehensive yield of the industrial pure iron medium plate produced by the process mode can reach more than 92 percent, and the process has the characteristics of simple process flow, low process cost and the like compared with the production modes of slab ingots, round bars and the like.
Detailed Description
The present application will be described in further detail with reference to examples.
Example 1:
the production is qualified and the customer is delivered to 80 tons of medium and thick plates made of pure iron YT01 material by adopting the following technical scheme in 8 months of 2021. The production process route is as follows: molten iron pretreatment, converter smelting, RH vacuum refining, continuous casting, cutting of middle plate blanks, blank heating, high-pressure water dephosphorization, rolling, air cooling finishing and inspection of a cross warehouse;
the raw material pure iron YT01 medium plate comprises the following components in percentage by weight:
c:0.0022, si:0.0051, mn: 0.0137P is less than or equal to 0.0046 and S:0.0032, al:0.0148, cr:0.0091, ni:0.0053, cu:0.0038, the balance being Fe and unavoidable impurities, wherein the weight percentages of harmful elements As and Sn in the impurities are respectively 0.0026 and 0.001, and Mn/S is 4.28;
the blank continuous casting specification is 220 multiplied by 1260 multiplied by 2150mm, the blank heating process adopts a three-section heating furnace, the preheating section temperature of the heating furnace is 1030-1080 ℃, the heating section temperature is 1220-1240 ℃, the soaking section temperature is 1230-1250 ℃, and the total residence time of the blank is 210-230 minutes.
The high-pressure water dephosphorization process comprises two dephosphorization steps, wherein the first dephosphorization step is performed before the initial rolling and the second dephosphorization step is performed after the rough rolling machine is performed to obtain an intermediate billet.
The rolling process adopts a mode of high Wen Cuga + low-temperature finish rolling, wherein: the initial rolling temperature after dephosphorization is 1130-1150 ℃, a roughing mill is produced by adopting a stretching longitudinal rolling mode, the stretching amount is controlled to be 85-95 mm, rapid rolling is performed under large pressure, the temperature of a roughing mill intermediate billet is 950-970 ℃, and the roughing mill intermediate billet is sent to a finishing mill; the initial rolling temperature of the finishing mill is 840-850 ℃, and the final rolling temperature is 780-800 ℃ when the finishing mill is rolled to the target thickness.
And (3) because the thickness specification of the target plate is specified as 50mm by contract, the target plate is processed by adopting a hot straightening and air cooling mode, the steel plate is straightened for three times by hot straightening and then is cooled by a cooling bed, and the steel plate is lifted down by adopting a mechanical clamp after being cooled to 180-200 ℃. And then off-line plasma sampling and cutting are carried out, and the method is completed.
Example 2:
the production is qualified and the customer is delivered to use 54 tons of electromagnetic pure iron DT4 medium plate by adopting the following technical scheme in 8 months 2021. The production process route is as follows: molten iron pretreatment, converter smelting, RH vacuum refining, continuous casting, cutting of middle plate blanks, blank heating, high-pressure water dephosphorization, rolling, air cooling finishing and inspection of a cross warehouse;
the electromagnetic pure iron DT4 medium plate comprises the following elements in percentage by weight:
c:0.0016, si:0.0041, mn:0.1923, P is less than or equal to 0.006, S:0.0024, al:0.5046, cr:0.006, ni:0.0089, cu:0.0036, the balance being Fe and unavoidable impurities;
the blank continuous casting specification is 220 multiplied by 1260 multiplied by 170mm-220 multiplied by 1260 multiplied by 2100mm, the blank heating process adopts a three-stage heating furnace, the preheating stage temperature of the heating furnace is 1020-1080 ℃, the heating stage is 1230-1240 ℃, the soaking stage furnace temperature is 1240-1250 ℃, and the total residence time of the blank is 210-230 minutes.
The high-pressure water dephosphorization process comprises two dephosphorization steps, wherein the first dephosphorization step is performed before the initial rolling and the second dephosphorization step is performed after the rough rolling machine is performed to obtain an intermediate billet.
The rolling process adopts a mode of high Wen Cuga + low-temperature finish rolling, wherein: the initial rolling temperature after dephosphorization is 1130-1150 ℃, a roughing mill is produced by adopting a stretching longitudinal rolling mode, the stretching amount is controlled to be 85-95 mm, rapid rolling is performed under large pressure, and the temperature of a roughing mill intermediate billet is 960-980 ℃ and is sent to a finishing mill; the initial rolling temperature of the finishing mill is 840-850 ℃, and the final rolling temperature is 760-780 ℃ when the finishing mill is rolled to the target thickness.
Because the thickness specification of the target plate is specified as 14mm by contract, the plate shape of the steel plate is processed by adopting an air cooling and cold straightening mode, the steel drawing operation is carried out after the temperature of the controlled cooling target temperature on a cooling bed is below 300 ℃, and then the steel plate is subjected to cold straightening and leveling. And performing off-line plasma sampling and cutting to obtain the product.
While the embodiments of the present application have been described in detail, the present application is not limited to the above embodiments, and modifications, equivalent substitutions, improvements, etc. can be made within the scope of the present application within the spirit and principle of the present application, and are also included in the scope of protection of the present application.

Claims (4)

1. A production method of an industrial pure iron medium plate is characterized in that: the production process route is as follows: molten iron pretreatment, converter smelting, RH vacuum refining, continuous casting, cutting of middle plate blanks, blank heating, high-pressure water dephosphorization, rolling, air cooling finishing and inspection of a cross warehouse;
the blank heating process adopts a three-section heating furnace, the preheating section temperature is set to 1020-1080 ℃, the heating section temperature is set to 1200-1240 ℃, the soaking section temperature is set to 1220-1260 ℃, and the total residence time is 9-11 min/10mm;
the high-pressure water dephosphorization process comprises two dephosphorization steps, wherein the first dephosphorization step is performed before the initial rolling, and the second dephosphorization step is performed after the rough rolling mill is performed to obtain an intermediate billet;
the rolling process adopts a mode of high Wen Cuga + low-temperature finish rolling, wherein: the initial rolling temperature of the roughing mill is 1100-1150 ℃, rapid rolling is carried out under large pressure, and the intermediate billet temperature of the roughing mill is 950-980 ℃; the initial rolling temperature of the finishing mill is 840-850 ℃, and the final rolling temperature is 750-800 ℃; the roughing mill is used for rolling in a stretching longitudinal rolling way, and the stretching amount is 85-95 mm;
in the air cooling finishing process step, aiming at the sheet material with the thickness of less than 50mm, adopting an air cooling and cold straightening mode to treat the sheet shape of the steel sheet, namely carrying out steel drawing operation after air cooling on a cooling bed to the temperature below the target temperature of 300 ℃, and then carrying out cold straightening and leveling on the steel sheet; for the plates with the thickness of 50mm and above, adopting a hot straightening and air cooling mode to treat the plate shape of the steel plate, namely adopting three reciprocating hot straightening to remove internal stress in the rolling process of the steel plate, and taking down the steel plate after the steel plate is cooled to the target temperature below 200 ℃ in an air cooling bed;
the industrial pure iron comprises electromagnetic pure iron DT4, raw material pure iron YT01 and raw material pure iron YT2;
the electromagnetic pure iron DT4 medium plate comprises the following elements in percentage by weight: c is less than or equal to 0.005, si is less than or equal to 0.05, mn is 0.17-0.23, P is less than or equal to 0.015, S is less than or equal to 0.01, al: 0.45-0.65, cr is less than or equal to 0.05, ni is less than or equal to 0.05, cu is less than or equal to 0.05, and the balance is Fe and unavoidable impurities;
the raw material pure iron YT01 medium plate comprises the following elements in percentage by weight: c is less than or equal to 0.003, si is less than or equal to 0.01, mn is less than or equal to 0.02, P is less than or equal to 0.008, S is less than or equal to 0.004, al is less than or equal to 0.02, cr is less than or equal to 0.02, ni is less than or equal to 0.02, cu is less than or equal to 0.02, and the balance is Fe and unavoidable impurities;
the raw material pure iron YT2 medium plate comprises the following elements in percentage by weight: c is less than or equal to 0.008, si is less than or equal to 0.04, mn is less than or equal to 0.14, P is less than or equal to 0.012, S is less than or equal to 0.006, al is less than or equal to 0.05, cr is less than or equal to 0.02, ni is less than or equal to 0.02, cu is less than or equal to 0.05, and the balance is Fe and unavoidable impurities.
2. The method for producing an industrially pure iron medium plate according to claim 1, characterized in that: the total residence time of the blank heating process is 10min/10mm.
3. The method for producing an industrially pure iron medium plate according to claim 1, characterized in that: the raw material pure iron YT01 medium plate comprises the following Mn element components in percentage by weight: 0.01-0.02%; the raw material pure iron YT2 medium plate comprises the following Mn element components in percentage by weight: 0.05% -0.14%.
4. The method for producing an industrially pure iron medium plate according to claim 1, characterized in that: in the rolling process, if the Mn/S ratio of the pure iron YT01 medium plate as the rolling raw material is smaller than 4, the widening amount is adjusted to 110mm.
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