CN114959488A - 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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Publication number
CN114959488A
CN114959488A CN202210682260.6A CN202210682260A CN114959488A CN 114959488 A CN114959488 A CN 114959488A CN 202210682260 A CN202210682260 A CN 202210682260A CN 114959488 A CN114959488 A CN 114959488A
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pure iron
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rolling
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CN114959488B (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
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Abstract

The invention 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 of edge cracking, stress cracking, plate shape buckling and the like easily caused in the production process of different types of industrial pure iron medium plates. The solution is as follows: an industrial pure iron medium plate and a production method thereof, the production process route is as follows: the method comprises the following steps of molten iron pretreatment, converter smelting, RH vacuum refining, continuous casting, cutting of medium plate blanks, blank heating, high-pressure water dephosphorization, rolling, air cooling finishing and inspection and delivery. The blank heating process adopts a three-section heating furnace. The rolling process adopts a mode of high-temperature rough rolling and low-temperature finish rolling. In the air cooling finishing process step, aiming at the plate with the thickness of below 50mm, the shape of the steel plate is processed by adopting an air cooling and cold straightening mode; and (3) treating the shape of the steel plate by adopting a heat straightening and air cooling mode aiming at the plate with the thickness of 50mm or above. The invention 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 invention 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 of steel, the chemical components of the industrial pure iron are mainly iron, the content of the iron is 99.50-99.90%, the carbon content is below 0.04%, and other elements are better and better. This steel close to pure iron is referred to as commercial pure iron because it is not really pure iron yet. The general industrial pure iron has particularly soft texture, particularly high toughness and good electromagnetic performance. The common industrial pure iron has two purposes, one of which utilizes the characteristics of high-purity iron of the material and is mainly applied to smelting various high-temperature alloys as raw material pure iron; the material is electromagnetic pure iron, which is mainly applied to the electrical industry by utilizing the characteristics of excellent electromagnetic performance of the material.
Due to the reasons of improving the material yield and the like, part of industrial pure iron is produced by adopting a medium plate single sheet rolling mode, and due to the steel type characteristics of the pure iron and the production characteristics of medium plates, the problems of rolling edge crack, stress crack, plate shape buckling and the like easily exist in the production process of the medium plates of the pure iron.
Disclosure of Invention
The invention provides an industrial pure iron medium plate and a production method thereof, aiming at overcoming the defects of the prior art and solving the technical problems of easy occurrence of rolling edge cracking, stress cracking, plate shape buckling and the like in the production process of different types of industrial pure iron medium plates.
The invention is realized by the following technical scheme.
The invention provides an industrial pure iron medium plate, which comprises electromagnetic pure iron DT4, raw material pure iron YT01 and raw material pure iron YT 2;
the electromagnetic pure iron DT4 medium plate comprises the following elements in percentage by weight: less than or equal to 0.005 of C, less than or equal to 0.05 of Si, 0.17-0.23 of Mn, less than or equal to 0.015 of P, less than or equal to 0.01 of S, Al: 0.45-0.65 wt%, Cr less than or equal to 0.05 wt%, Ni less than or equal to 0.05 wt%, Cu less than or equal to 0.05 wt%, and Fe and inevitable impurity for the rest;
the weight percentages of the element components of the raw material pure iron YT01 medium plate are as follows: less than or equal to 0.003 percent of C, less than or equal to 0.01 percent of Si, less than or equal to 0.02 percent of Mn, less than or equal to 0.008 percent of P, less than or equal to 0.004 percent of S, less than or equal to 0.02 percent of Al, less than or equal to 0.02 percent of Cr, less than or equal to 0.02 percent of Ni, less than or equal to 0.02 percent of Cu, and the balance of Fe and inevitable impurities;
the weight percentages of the element components of the raw material pure iron YT2 medium plate are as follows: less than or equal to 0.008 percent of C, less than or equal to 0.04 percent of Si, less than or equal to 0.14 percent of Mn, less than or equal to 0.012 percent of P, less than or equal to 0.006 percent of S, less than or equal to 0.05 percent of Al, less than or equal to 0.02 percent of Cr, less than or equal to 0.02 percent of Ni, less than or equal to 0.05 percent of Cu, and the balance of Fe and inevitable impurities.
Because the content of S is too high, the S exists in the form of FeS in the iron-carbon alloy, Fe + FeS eutectic with low melting point formed by the S and the Fe is gathered on a grain boundary during crystallization, and is crushed along the grain boundary during rolling, and particularly, rolling edge cracks easily appear on two sides of a continuous casting billet. Therefore, the content of S in the molten iron can be strictly controlled during smelting of the industrial pure iron, and meanwhile, the Mn element and the S can easily form high-melting-point MnS to realize the effect of fixing the S, so that the Mn element is internally controlled according to the characteristics of the medium plate, and the target of the weight percentage of the Mn element in the raw material pure iron YT01 is controlled according to 0.01-0.02% on the premise of meeting the standard; for the raw material pure iron YT2, the weight percentage of Mn element components is controlled according to 0.05-0.14%, and the Mn/S ratio is ensured to be more than 4 as much as possible; for the electromagnetic pure iron DT4, good machining performance needs to be ensured due to the requirement of the material use process, so that the Mn content is higher and can be controlled within the range of 0.17-0.23%.
A production method of an industrial pure iron medium plate comprises the following production process routes: molten iron pretreatment, converter smelting, RH vacuum refining, continuous casting, cutting of medium plate blanks, blank heating, high-pressure water dephosphorization, rolling, air cooling finishing and inspection delivery;
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 be 1200-1240 ℃, the temperature of a soaking section is set to be 1220-1260 ℃, the total furnace residence time is 9-11 min/10mm, and the target is 10min/10 mm;
the high-pressure water dephosphorization process comprises two times of dephosphorization, wherein the first time of dephosphorization is before rolling, and the second time of dephosphorization is after rolling into an intermediate blank in a roughing mill;
the rolling process adopts a mode of high-temperature rough rolling and low-temperature finish rolling, homomorphic isomer transformation can occur in the pure iron in the cooling process, gamma-Fe is transformed into alpha-Fe at the temperature of about 900 ℃, the change of unit cell volume easily generates higher structural stress at 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 the intermediate billet temperature of the roughing mill is ensured to be more than 950 ℃ by adopting rapid rolling under high pressure; the initial rolling temperature of the finishing mill is controlled below 850 ℃, the final rolling temperature is more than or equal to 750 ℃, the rolling 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 the generation of cracked edges, the rolling mode of the roughing mill is widening longitudinal rolling, and the target widening amount is 90 mm;
in the air cooling finishing process step, due to the characteristic of low yield strength of the pure iron medium plate, in order to ensure the flatness of the steel plate, the steel plate shape is processed by adopting an air cooling and cold straightening mode aiming at the plate with the thickness of below 50mm, namely the steel plate is drawn after being air-cooled to the target temperature of below 300 ℃ on a cooling bed, and then the steel plate is cold-straightened and flattened; aiming at the plates with the thickness of 50mm and above, the shape of the steel plate is processed by adopting a hot straightening and air cooling mode, namely, the internal stress in the rolling process of the steel plate is removed by adopting three times of reciprocating hot straightening, and the steel plate is taken down after being cooled to the target temperature of below 200 ℃ on a cooling bed, so that the deformation in the hoisting process of the steel plate is prevented.
Furthermore, in the rolling process, if the rolled raw material pure iron YT01 medium plate has an Mn/S ratio less than 4, the target broadening amount is adjusted to be 110 mm.
The Mn element is controlled according to the characteristics of the medium and thick plates made of different materials, the problem that the steel plate is inappropriate in size due to edge cracking can be solved according to the adjustment of the manganese-sulfur ratio to the target broadening in the rolling process, and the yield is improved; the steel plate cracking problem caused by red brittleness is effectively relieved by adopting a high-temperature rough rolling and low-temperature finish rolling mode; the cooling and straightening processes are formulated according to different specifications, so that the deformation problem of the rolled steel plate in the hoisting process can be effectively avoided, and the shape of the steel plate in a delivery state can be ensured to meet the user requirements. The hot rolling comprehensive yield of the industrial pure iron medium plate produced by the process can reach more than 92%, and the process has the characteristics of simple process flow, low process cost and the like compared with the production modes of flat ingots, round rods and the like.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1:
the 8 th month in 2021 adopts the following technical scheme to produce qualified medium and heavy plates made of pure iron YT01 which are delivered to customers to use 80 tons. The production process route is as follows: molten iron pretreatment, converter smelting, RH vacuum refining, continuous casting, cutting of medium plate blanks, blank heating, high-pressure water dephosphorization, rolling, air cooling finishing and inspection delivery;
the weight percentages of the element components in the raw material pure iron YT01 medium plate are as follows:
c: 0.0022, Si: 0.0051, Mn: 0.0137, P is less than or equal to 0.0046, S: 0.0032, Al: 0.0148, Cr: 0.0091, Ni: 0.0053, Cu: 0.0038, the balance being Fe and inevitable impurities, the weight percentages of harmful elements As and Sn in the impurities being 0.0026 and 0.001 respectively, and the Mn/S being 4.28;
the continuous casting specification of the blank is 220 multiplied by 1260 multiplied by 2150mm, the blank heating process adopts a three-section type heating furnace, the temperature of a preheating section of the heating furnace is set to be 1030-1080 ℃, the temperature of a heating section is set to be 1220-1240 ℃, the temperature of a soaking section is set to be 1230-1250 ℃, and the total time of the blank staying in the furnace is 210-230 minutes.
The high-pressure water dephosphorization process comprises two times of dephosphorization, wherein the first time of dephosphorization is before rolling, and the second time of dephosphorization is after rolling into an intermediate blank in a roughing mill.
The rolling process adopts a mode of high-temperature rough rolling and low-temperature finish rolling, wherein: the initial rolling temperature after dephosphorization is 1130-1150 ℃, the roughing mill is produced by adopting a widening longitudinal rolling mode, the widening amount is controlled to be 85-95 mm, the roughing mill is rapidly rolled under high pressure, the intermediate billet temperature of the roughing mill is 950-970 ℃, and the 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) as the contractually specified target plate thickness specification is 50mm, treating the plate by adopting a hot straightening and air cooling mode, straightening the steel plate for three times by using the hot straightening, then air cooling the steel plate to a cooling bed, and then hanging the steel plate by using a mechanical clamp after air cooling the steel plate to 180-200 ℃. Then off-line plasma sampling and cutting are carried out, and the method can be finished.
Example 2:
the method is qualified in 8 months in 2021 by adopting the following technical scheme and delivers 54 tons of medium and thick plates made of electromagnetic pure iron DT4 to customers. The production process route is as follows: molten iron pretreatment, converter smelting, RH vacuum refining, continuous casting, cutting of medium plate blanks, blank heating, high-pressure water dephosphorization, rolling, air cooling finishing and inspection delivery;
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 with the balance being Fe and unavoidable impurities;
the continuous casting specification of the blank is 220 multiplied by 1260 multiplied by 1700 mm-220 multiplied by 1260 multiplied by 2100mm, the blank heating process adopts a three-section type heating furnace, the preheating section temperature of the heating furnace is 1020-1080 ℃, the heating section temperature is 1230-1240 ℃, the soaking section furnace temperature is 1240-1250 ℃, and the total blank holding time is 210-230 minutes.
The high-pressure water dephosphorization process comprises two times of dephosphorization, wherein the first time of dephosphorization is before rolling, and the second time of dephosphorization is after rolling into an intermediate blank in a roughing mill.
The rolling process adopts a mode of high-temperature rough rolling and low-temperature finish rolling, wherein: the initial rolling temperature after dephosphorization is 1130-1150 ℃, the roughing mill is produced by adopting a widening longitudinal rolling mode, the widening amount is controlled to be 85-95 mm, the roughing mill is rapidly rolled under high pressure, and the intermediate blank temperature of the roughing mill 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.
The plate shape of the steel plate is processed by adopting a method of air cooling and cold straightening as the contractually specified target plate thickness specification is 14mm, and the steel drawing operation is carried out after the target temperature is controlled to be below 300 ℃ on a cooling bed, and then the steel plate is subjected to cold straightening. Then off-line plasma sampling and cutting are carried out, and the process can be finished.
Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and modifications can be made within the knowledge of those skilled in the art, and any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, are included in the scope of the present invention.

Claims (4)

1. An industrial pure iron medium plate is characterized in that: the industrial pure iron comprises electromagnetic pure iron DT4, raw material pure iron YT01 and raw material pure iron YT 2;
the electromagnetic pure iron DT4 medium plate comprises the following elements in percentage by weight: less than or equal to 0.005 of C, less than or equal to 0.05 of Si, 0.17-0.23 of Mn, less than or equal to 0.015 of P, less than or equal to 0.01 of S, Al: 0.45-0.65 wt%, Cr less than or equal to 0.05 wt%, Ni less than or equal to 0.05 wt%, Cu less than or equal to 0.05 wt%, and Fe and inevitable impurity for the rest;
the weight percentages of the element components of the raw material pure iron YT01 medium plate are as follows: less than or equal to 0.003 percent of C, less than or equal to 0.01 percent of Si, less than or equal to 0.02 percent of Mn, less than or equal to 0.008 percent of P, less than or equal to 0.004 percent of S, less than or equal to 0.02 percent of Al, less than or equal to 0.02 percent of Cr, less than or equal to 0.02 percent of Ni, less than or equal to 0.02 percent of Cu, and the balance of Fe and inevitable impurities;
the weight percentages of the element components of the raw material pure iron YT2 medium plate are as follows: less than or equal to 0.008 percent of C, less than or equal to 0.04 percent of Si, less than or equal to 0.14 percent of Mn, less than or equal to 0.012 percent of P, less than or equal to 0.006 percent of S, less than or equal to 0.05 percent of Al, less than or equal to 0.02 percent of Cr, less than or equal to 0.02 percent of Ni, less than or equal to 0.05 percent of Cu, and the balance of Fe and inevitable impurities.
2. The medium plate of industrial pure iron as claimed in claim 1, wherein: the Mn element of the raw material pure iron YT01 medium plate comprises the following components in percentage by weight: 0.01-0.02%; the Mn element of the medium plate made of pure iron YT2 comprises the following components in percentage by weight: 0.05% -0.14%.
3. A method for producing an industrial pure iron medium plate according to claim 1, characterized in that: the production process route is as follows: molten iron pretreatment, converter smelting, RH vacuum refining, continuous casting, cutting of medium plate blanks, blank heating, high-pressure water dephosphorization, rolling, air cooling finishing and inspection delivery;
the blank heating process adopts a three-section heating furnace, the temperature of a preheating section is set to be 1020-1080 ℃, the temperature of a heating section is set to be 1200-1240 ℃, the temperature of a soaking section is set to be 1220-1260 ℃, the total furnace standing time is 9-11 min/10mm, and the target is 10min/10 mm;
the high-pressure water dephosphorization process comprises two times of dephosphorization, wherein the first time of dephosphorization is before rolling, and the second time of dephosphorization is after rolling into an intermediate blank in a roughing mill;
the rolling process adopts a mode of high-temperature rough rolling and low-temperature finish rolling, wherein: the initial rolling temperature of the roughing mill is 1100-1150 ℃, the roughing mill is rapidly rolled under high 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 rolling mode of the roughing mill is widening longitudinal rolling, and the widening amount is 85-95 mm;
in the air cooling finishing process step, aiming at the plate with the thickness of below 50mm, the plate shape of the steel plate is processed by adopting an air cooling and cold straightening mode, namely, the steel plate is drawn after being air-cooled to the target temperature of below 300 ℃ on a cooling bed, and then the steel plate is cold-straightened and flattened; aiming at the plate with the thickness of 50mm or above, the shape of the steel plate is processed by adopting a heat straightening and air cooling mode, namely, the internal stress of the steel plate in the rolling process is removed by adopting three times of reciprocating heat straightening, and the steel plate is taken down after being cooled to the target temperature of below 200 ℃ in the air on a cooling bed.
4. The method for producing an industrial pure iron medium plate according to claim 3, wherein: in the process of rolling, if a thick plate made of pure iron YT01 is rolled and the Mn/S ratio of the thick plate is less than 4, the broadening range is adjusted to be 110 mm.
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