CN113774286A - High-purity raw steel and preparation method thereof - Google Patents
High-purity raw steel and preparation method thereof Download PDFInfo
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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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
Abstract
The invention relates to high-purity raw steel and a preparation method thereof. The product comprises the following chemical components in percentage by weight: 0.15 to 0.30 percent of C, less than or equal to 0.0015 percent of S, less than or equal to 0.0035 percent of P, less than or equal to 0.05 percent of Si, less than or equal to 0.05 percent of Mn, less than or equal to 0.20 percent of Cu, less than or equal to 0.015 percent of Al, less than or equal to 0.005 percent of Ti, less than or equal to 0.01 percent of Sn, less than or equal to 0.01 percent of Sb, less than or equal to 0.01 percent of Pb, less than or equal to 0.02 percent of As, less than or equal to 0.01 percent of Bi, less than or equal to 0.01 percent of N, and less than or equal to 0.0003 percent of H; the balance being Fe. The preparation method adopts an electric arc furnace, an LF furnace and a VD tank to carry out dephosphorization, deoxidation, desulfurization and vacuum degassing treatment; obtaining an industrial pure iron ingot in an argon environment; and finally obtaining the high-purity raw steel after heating, forging/rolling, cutting, derusting and cleaning. The product has low impurity element content and high purity.
Description
Technical Field
The invention relates to high-purity raw material steel adopted in high-performance alloy smelting and a preparation method thereof. Because of low content of various impurity elements and high purity, the method can be used as a raw material for smelting high-end steel such as secondary hardening type ultrahigh-strength steel.
Background
The secondary hardening type ultrahigh strength steel is formed by adding alloy strengthening elements such as Co, Ni and the like, and precipitating M after tempering2The C-phase reinforced ultrahigh-strength steel has high strength, good toughness and good crack expansion resistance in a corrosive environment, is mainly used for manufacturing key bearing structural parts such as bearing frames, beams, shafts and other parts, and is the key direction for the development of heavy industrial materials. Representative steel grades include AF1410, Aermet100, M54, etc., and belong to Cr-Ni-Co-Mo series high-purity steel grades containing carbon. In order to meet the harsh service environment in the heavy industry field and meet the requirements of high strength, high toughness, corrosion resistance and high temperature resistance, the impurity element content of the secondary hardening type ultrahigh-strength steel is required to be very low during smelting. Because of insufficient purity and high content of impurities such as sulfur, phosphorus, silicon, manganese, aluminum, titanium and the like, the raw material pure iron and industrial pure iron produced by the domestic GB9971 and GB6983 standards cannot meet the requirements. The secondary hardening type ultrahigh-strength steel produced by the pure iron can not reach the plasticity and toughness specified by international special material standards in a high-strength state, particularly the required content of silicon, manganese, aluminum and titanium is low, deoxidizing agents containing silicon, manganese, aluminum and titanium can not be used in the reduction stage of smelting, and the raw material steel can not be produced according to the conventional technology and smelting process.
At present, the electrolytic method can be adopted to produce high-purity industrial pure iron in batches abroad, the purity is as high as 99.9%, but the import price of the pure iron is high, and large-scale industrial application cannot be carried out; the domestic electrolytic method for manufacturing high-purity industrial pure iron is still in an exploration stage, and the industrial batch production capacity is not formed; in view of the above, it is required to develop a high-purity ultra-low carbon industrial pure iron raw material.
Disclosure of Invention
The present invention is directed to a high purity raw steel and a method for manufacturing the same, which solve the above problems of the prior art.
The invention is realized by the following technical scheme:
the invention provides high-purity raw material steel which comprises the following elements in percentage by mass: c: 0.15 to 0.30 percent of S, less than or equal to 0.0015 percent of S, less than or equal to 0.0035 percent of P, less than or equal to 0.05 percent of Si, less than or equal to 0.05 percent of Mn, less than or equal to 0.20 percent of Cu, less than or equal to 0.015 percent of Al, less than or equal to 0.005 percent of Ti, less than or equal to 0.01 percent of Sn, less than or equal to 0.01 percent of Sb, less than or equal to 0.01 percent of Pb, less than or equal to 0.02 percent of As, less than or equal to 0.01 percent of Bi, less than or equal to 0.01 percent of N, and less than or equal to 0.0003 percent of H; the balance being Fe.
A method for preparing the high-purity raw material steel comprises the following steps:
s1, selecting scrap steel and pig iron as raw materials, smelting the raw materials by using an electric arc furnace, and carrying out dephosphorization treatment and primary desulfurization treatment;
s2, refining the molten steel obtained in the step S1 in an LF furnace, and performing diffusion deoxidation treatment and further desulfurization treatment by using carbon powder;
s3, carrying out VD tank vacuum degassing on the molten steel obtained in the step S2, and then pouring under the protection of argon to obtain an industrial pure iron ingot;
s4, heating the industrial pure iron ingot obtained in the step S3 to 1150-1200 ℃, preserving heat, forging or rolling to obtain an industrial pure iron bar, processing the industrial pure iron bar into lump materials, and removing oxide skin and iron rust on the surface of the lump materials to obtain the high-purity raw material steel.
Preferably, in step S1, the raw material contains 0.7-1.0% of carbon, 0.02% or less of phosphorus, and 0.02% or less of sulfur.
Preferably, the specific operation of step S1 is:
smelting the raw materials at 1540-1570 ℃ until the carbon content is not more than 0.08% and the phosphorus content is not more than 0.02%, slagging off, supplementing slag materials (mainly calcium oxide, calcium chloride, silicon dioxide and the like), blowing oxygen, heating to a temperature not lower than 1650 ℃, adding carbon powder, adjusting the carbon content to be 0.15-0.30%, continuously supplementing the slag materials, making high-alkalinity white slag for desulfurization, slagging off after the sulfur content is not more than 0.06%, making new slag and tapping, and ensuring that the contents of all elements in molten steel are respectively: less than or equal to 0.05 percent of Si, less than or equal to 0.05 percent of Mn, less than or equal to 0.20 percent of Cu, less than or equal to 0.015 percent of Al, less than or equal to 0.005 percent of Ti, less than or equal to 0.01 percent of Sn, less than or equal to 0.01 percent of Sb, less than or equal to 0.01 percent of Pb, less than or equal to 0.02 percent of As and less than or equal to 0.01 percent of Bi.
The high-alkalinity white slag is alkaline slag with the calcium oxide content more than 2 times that of silicon dioxide, and is white after being cooled, so the high-alkalinity white slag is called.
The reaction principle is as follows:
2[P]+5(FeO)+3(CaO)＝(3CaO·P2O5)+5Fe
2[P]+5(FeO)+4(CaO)＝(4CaO.P2O5)+5Fe
[Si]+2[O]＝(SiO2)
[Mn]+[O]＝(MnO)
2[Al]+3[O]＝(Al2O3)
[Ti]+2[O]＝(TiO2)
[FeS]+(CaO)＝(CaS)+(FeO)
[MnS]+(CaO)＝(CaS)+(MnO)。
preferably, step S2 is performed under an argon protective atmosphere, and the sulfur content in the molten steel obtained in step S2 is not more than 0.0015%.
The reaction principle is as follows:
(FeO)+C＝[Fe]+CO
[FeS]+(CaO)+C＝[Fe]+(CaS)+CO。
preferably, in step S3, the vacuum degree is controlled not to exceed 67Pa, the vacuum degassing time is not less than 20min, and the N content and the H content in the molten steel obtained in step S3 are respectively less than or equal to 0.01% and less than or equal to 0.0003%.
Preferably, in the step S3, the casting temperature is 1590-1610 ℃.
The invention is mainly used as the raw material for smelting high-end steel grades such as secondary hardening type ultrahigh-strength steel, ultrahigh-strength stainless steel and the like, and the chemical components of the raw material directly influence the chemical components and the performances of the high-end steel grades. The invention mainly relates to elements such As carbon (C), nitrogen (N), hydrogen (H), sulfur (S), phosphorus (P), silicon (Si), manganese (Mn), aluminum (Al), titanium (Ti), copper (Cu), tin (Sn), antimony (Sb), lead (Pb), arsenic (As), bismuth (Bi) and the like, and the elements have the following influences on the performances of high-end steel such As secondary hardening type ultrahigh-strength steel, ultrahigh-strength stainless steel and the like:
carbon (C) is an element that generates interstitial solid solution strengthening and M2C carbide precipitation strengthening in martensite transformation, and is a main element for obtaining high strength of ultra-high strength steel. The higher the content of C, the higher the tensile strength and hardness of the steel, and the lower the impact toughness and fracture toughness. With increasing C content, partial quasi cleavage in the impact fracture occurs. The higher the C content, the higher the peak value of the aging curve of the steel. Therefore, the carbon content is controlled to be 0.1-0.3% in comprehensive consideration.
Nitrogen (N) is an interstitial solid solution element which can significantly improve the matrix strength of steel, but in ultra-high strength maraging steel and ultra-high strength stainless steel, it is very easy to form hard and sharp Ti (C, N) and AlN inclusions with titanium (Ti) and aluminum (Al), and also to form hard polygonal (Ti, Mo) C inclusions with Mo element, thereby severely reducing the toughness of stainless steel, so that the industrial pure iron of the present invention is strictly controlled by the above elements: less than or equal to 0.01 percent of N, less than or equal to 0.015 percent of Al and less than or equal to 0.005 percent of Ti.
Hydrogen (H) causes defects such as white spots and point-like segregation in the steel, resulting in hydrogen embrittlement, and significantly reduces the reduction of area. Therefore, the invention strictly controls the hydrogen content H to be less than or equal to 0.0003 percent.
Sulfur (S) and manganese (Mn) easily form MnS inclusions, which act as crack sources in the matrix of the steel, and in addition, sulfur (S) and phosphorus (P) elements segregate at grain boundaries to weaken the grain boundaries, so that the high contents of S and P impair the plasticity of the steel, resulting in a decrease in the reduction of area of the steel. The invention requires that S is less than or equal to 0.0015 percent, P is less than or equal to 0.0035 percent and Mn is less than or equal to 0.05 percent.
Silicon (Si) is mainly used as a deoxidizer during smelting and can strengthen the matrix, improve corrosion resistance and high-temperature oxidation resistance of steel. However, too high a silicon content leads to precipitation of harmful phases, which reduces the hot workability and impact toughness of the steel. Therefore, the silicon content of the invention is controlled below 0.05%.
Copper (Cu) can be a strengthening element in stainless steel, and the addition of copper also enhances the resistance of the steel to stress corrosion, but too much copper causes copper embrittlement during hot working of stainless steel. Comprehensively, the copper content of the invention is controlled below 0.20%.
The five elements of tin (Sn), antimony (Sb), lead (Pb), arsenic (As) and bismuth (Bi) are generally called "five-harmful elements" because they have adverse effects on the workability and usability of steel in most cases, and they have similar chemical properties and similar mechanisms of action and are often mixed together. Although the content of the five-harmful elements is not high, the five-harmful elements are large in atomic radius, are mostly enriched on grain boundaries and surfaces, and are unevenly distributed, so that the five-harmful elements bring great harm to the processing and performance of steel, and are mainly reflected in that: firstly) the melting points of the steel are lower than that of steel, and the content of steel type exceeding a certain value can reduce the melting point of the steel, increase the hot brittleness tendency of the steel and deteriorate the hot workability of steel billets and steel; secondly), the high-temperature mechanical property is obviously reduced, and the high-temperature brittleness of the steel is increased; thirdly), the strength and toughness of the steel are damaged in a low-temperature environment, so that the steel becomes brittle; tetra) arsenic (As) and antimony (Sb) also have a large influence on the fatigue properties of steel. Therefore, the industrial pure iron of the invention has strict control on 'five harmful elements': sn is less than or equal to 0.01 percent, Sb is less than or equal to 0.01 percent, Pb is less than or equal to 0.01 percent, As is less than or equal to 0.02 percent, and Bi is less than or equal to 0.01 percent.
The invention has the following beneficial effects:
1) compared with the raw material pure iron and industrial pure iron which are produced according to GB9971 and GB6983 standards and are used in the domestic industrial field in large quantity, the invention has lower content of various impurity elements and higher purity, and can be used as the raw material for smelting high-end steel grades such as secondary hardening type ultrahigh-strength steel, ultrahigh-strength stainless steel and the like.
2) The secondary hardening type ultrahigh-strength steel (M54) and the ultrahigh-strength stainless steel (S53) which are smelted by the high-purity raw material steel obtained by the method all reach the strength, plasticity and toughness indexes specified by international special material standards (such as AMS 6516 and AMS 5922).
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
The "content" referred to in the present invention is a mass percentage.
Example 1
1) Selecting raw materials such as scrap steel, pig iron and the like, wherein the raw materials comprise the following components: 0.95%, P: 0.020%, S: 0.02 percent, the raw materials are smelted in an electric arc furnace to carry out dephosphorization (P) and preliminary desulfurization (S). In the P removing operation process, the temperature is actually measured and controlled to be 1557 ℃, the C is measured to be 0.075%, the P is measured to be 0.0018%, and slag removing is carried out. After adding slag charge, blowing oxygen and heating to 1657 ℃, and adding carbon powder to adjust the C content to 0.16%. Continuously adding slag charge, making high-alkalinity white slag for desulfurization, removing slag after the measured S content reaches 0.005%, making new slag, tapping, and detecting the content of each element in molten steel before tapping within the following range: less than or equal to 0.05 percent of Si, less than or equal to 0.05 percent of Mn, less than or equal to 0.20 percent of Cu, less than or equal to 0.015 percent of Al, less than or equal to 0.005 percent of Ti, less than or equal to 0.01 percent of Sn, less than or equal to 0.01 percent of Sb, less than or equal to 0.01 percent of Pb, less than or equal to 0.02 percent of As, and less than or equal to 0.01 percent of Bi in percentage by weight.
2) Refining the molten steel subjected to dephosphorization and desulfurization treatment in the step 1 in an LF furnace, and performing diffusion deoxidation and further desulfurization treatment by using carbon powder; and (4) keeping argon blowing stirring during the desulfurization treatment, and finishing LF refining when the S content is measured to reach 0.0009%.
3) And (3) carrying out vacuum degassing treatment on the molten steel subjected to desulfurization treatment in the step (2) in a VD tank at a vacuum degree of 60Pa for 20 minutes, and tapping when the N content is 0.0070% and the H content is 0.0001%.
4) Pouring the molten steel with the components reaching the standard in the step 3 into a 1.2-ton ingot mold under an argon protection environment to obtain an industrial pure iron ingot, wherein the pouring temperature is 1605 ℃;
5) and (4) heating the industrial pure iron ingot obtained in the step (4) to 1150 ℃, preserving heat for 4.5 hours, discharging from the furnace, rolling to obtain a 140mm industrial pure iron square rod, cutting an industrial pure iron bar into 280mm blocks with a length suitable for charging size by using a tool, and removing oxide skin and iron rust on the surface of the industrial pure iron block by using a roller to finally obtain the high-purity raw material steel.
6) A sample was taken from the high purity steel stock and subjected to chemical analysis, and the results of the detection are shown in Table 1.
Example 2
1) Selecting raw materials such as scrap steel, pig iron and the like, wherein the raw materials comprise the following components: 0.75%, P: 0.018%, S: 0.019 percent, and the raw materials are smelted in an electric arc furnace to be dephosphorized (P) and primarily desulfurized (S). In the P removing operation process, the temperature is actually measured and controlled to be 1563 ℃, the C is measured to be 0.073%, and the P is measured to be 0.0019%, and the slag is removed. After adding slag charge, blowing oxygen and raising the temperature to 1660 ℃, and adding carbon powder to adjust the C content to 0.27%. Continuously adding slag charge, making high-alkalinity white slag for desulfurization, removing slag after the measured S content reaches 0.006 percent, tapping after new slag is made, and detecting the content of each element in the molten steel before tapping within the following range: less than or equal to 0.05 percent of Si, less than or equal to 0.05 percent of Mn, less than or equal to 0.20 percent of Cu, less than or equal to 0.015 percent of Al, less than or equal to 0.005 percent of Ti, less than or equal to 0.01 percent of Sn, less than or equal to 0.01 percent of Sb, less than or equal to 0.01 percent of Pb, less than or equal to 0.02 percent of As, and less than or equal to 0.01 percent of Bi in percentage by weight.
2) Refining the molten steel subjected to dephosphorization and desulfurization treatment in the step 1 in an LF furnace, and performing diffusion deoxidation and further desulfurization treatment by using carbon powder; and (4) keeping argon blowing stirring during the desulfurization treatment, and finishing LF refining when the S content is measured to reach 0.0008%.
3) And (3) carrying out vacuum degassing treatment on the molten steel subjected to desulfurization treatment in the step (2) in a VD tank at a vacuum degree of 63Pa for 20 minutes, and tapping when the N content is 0.0085% and the H content is 0.0001%.
4) Pouring the molten steel with the components reaching the standard in the step 3 into a 2.3-ton ingot mold under an argon protection environment to obtain an industrial pure iron ingot, wherein the pouring temperature is 1659 ℃;
5) and (4) heating the industrial pure iron ingot obtained in the step (4) to 1200 ℃, preserving heat for 4 hours, then discharging from the furnace and rolling to obtain a 120mm industrial pure iron square rod, cutting an industrial pure iron bar into blocks with the length of 250mm and suitable for charging, removing oxide skin and iron rust on the surface of the industrial pure iron block by using a roller, and finally obtaining the high-purity raw material steel.
6) A sample was taken from the high purity steel stock and subjected to chemical analysis, and the results of the detection are shown in Table 1.
Example 3
1) Selecting raw materials such as scrap steel, pig iron and the like, wherein the raw materials comprise the following components: 0.85%, P: 0.019%, S: 0.020%, and the raw materials are smelted in an electric arc furnace to carry out dephosphorization (P) and primary desulfurization (S). In the P removing operation process, the temperature is actually measured and controlled to be 1565 ℃, the C is measured to be 0.076%, and the P is measured to be 0.0018%, and the slag is removed. After adding slag charge, blowing oxygen, heating to 1670 ℃, and adding carbon powder to adjust the C content to 0.23%. Continuously adding slag charge, making high-alkalinity white slag for desulfurization, when the measured S content reaches 0.005%, slagging off, making new slag and discharging, and detecting the content of each element in molten steel before tapping within the following range: less than or equal to 0.05 percent of Si, less than or equal to 0.05 percent of Mn, less than or equal to 0.20 percent of CU, less than or equal to 0.015 percent of Al, less than or equal to 0.005 percent of Ti, less than or equal to 0.01 percent of Sn, less than or equal to 0.01 percent of Sb, less than or equal to 0.01 percent of Pb, less than or equal to 0.02 percent of As, and less than or equal to 0.01 percent of Bi in percentage by weight.
2) Refining the molten steel subjected to dephosphorization and desulfurization treatment in the step 1 in an LF furnace, and performing diffusion deoxidation and further desulfurization treatment by using carbon powder; and (4) keeping argon blowing stirring during the desulfurization treatment, and finishing LF refining when the S content is measured to reach 0.0009%.
3) And (3) carrying out vacuum degassing treatment on the molten steel subjected to desulfurization treatment in the step (2) in a VD tank at a vacuum degree of 60Pa for 20 minutes, and tapping when the N content is 0.0077% and the H content is 0.0001%.
4) Pouring the molten steel with the components reaching the standard in the step 3 into a 2.3-ton ingot mold under an argon protection environment to obtain an industrial pure iron ingot, wherein the pouring temperature is 1607 ℃;
5) and (4) heating the industrial pure iron ingot obtained in the step (4) to 1200 ℃, preserving heat for 4 hours, then discharging from the furnace and rolling to obtain a 140mm square rod of industrial pure iron, cutting the industrial pure iron rod into blocks with the length of 140mm suitable for charging size by using a tool, and removing oxide skin and iron rust on the surface of the industrial pure iron block by using a shot blasting machine to finally obtain the high-purity raw material steel.
6) A sample was taken from the high purity steel stock and subjected to chemical analysis, and the results of the detection are shown in Table 1.
TABLE 1 chemical composition (in mass%) of high-purity raw material steel in examples of the present invention
In summary, the present invention is only a preferred embodiment, and not intended to limit the scope of the invention, and all equivalent changes and modifications in the shape, structure, characteristics and spirit of the present invention described in the claims should be included in the scope of the present invention.
Claims (7)
1. The high-purity raw material steel is characterized by comprising the following elements in percentage by mass: c: 0.15 to 0.30 percent of S, less than or equal to 0.0015 percent of S, less than or equal to 0.0035 percent of P, less than or equal to 0.05 percent of Si, less than or equal to 0.05 percent of Mn, less than or equal to 0.20 percent of Cu, less than or equal to 0.015 percent of Al, less than or equal to 0.005 percent of Ti, less than or equal to 0.01 percent of Sn, less than or equal to 0.01 percent of Sb, less than or equal to 0.01 percent of Pb, less than or equal to 0.02 percent of As, less than or equal to 0.01 percent of Bi, less than or equal to 0.01 percent of N, and less than or equal to 0.0003 percent of H; the balance being Fe.
2. A method for producing a high purity raw material steel as set forth in claim 1, comprising the steps of:
s1, selecting scrap steel and pig iron as raw materials, smelting the raw materials by using an electric arc furnace, and carrying out dephosphorization treatment and primary desulfurization treatment;
s2, refining the molten steel obtained in the step S1 in an LF furnace, and performing diffusion deoxidation treatment and further desulfurization treatment by using carbon powder;
s3, carrying out VD tank vacuum degassing on the molten steel obtained in the step S2, and then pouring under the protection of argon to obtain an industrial pure iron ingot;
s4, heating the industrial pure iron ingot obtained in the step S3 to 1150-1200 ℃, preserving heat, forging or rolling to obtain an industrial pure iron bar, processing the industrial pure iron bar into lump materials, and removing oxide skin and iron rust on the surface of the lump materials to obtain the high-purity raw material steel.
3. The method of manufacturing a high purity raw material steel according to claim 2, wherein in step S1, the raw material contains 0.7 to 1.0% of carbon, 0.02% or less of phosphorus, and 0.02% or less of sulfur.
4. The method for producing a high purity raw material steel as set forth in claim 2, wherein the step S1 is specifically performed by:
smelting the raw materials at 1540-1570 ℃, slagging off until the carbon content is not more than 0.08% and the phosphorus content is not more than 0.02%, supplementing slag, blowing oxygen to raise the temperature to be not less than 1650 ℃, adding carbon powder to adjust the carbon content to be 0.15-0.30%, continuing supplementing slag, manufacturing high-alkalinity white slag for desulfurization, slagging off when the sulfur content is not more than 0.06%, manufacturing new slag and tapping, and ensuring that the contents of all elements in molten steel are respectively: less than or equal to 0.05 percent of Si, less than or equal to 0.05 percent of Mn, less than or equal to 0.20 percent of Cu, less than or equal to 0.015 percent of Al, less than or equal to 0.005 percent of Ti, less than or equal to 0.01 percent of Sn, less than or equal to 0.01 percent of Sb, less than or equal to 0.01 percent of Pb, less than or equal to 0.02 percent of As and less than or equal to 0.01 percent of Bi.
5. The method of manufacturing high purity raw material steel according to claim 2, wherein the step S2 is performed under an argon atmosphere, and the sulfur content of the molten steel obtained in the step S2 is not more than 0.0015%.
6. The method of manufacturing a high purity raw material steel as set forth in claim 2, wherein in step S3, the degree of vacuum is controlled not to exceed 67Pa, the vacuum degassing time is not less than 20min, and the molten steel obtained in step S3 has a N content of not more than 0.01% and an H content of not more than 0.0003%.
7. The method of manufacturing a high purity raw material steel as set forth in claim 2, wherein the casting temperature is 1590 to 1610 ℃ in step S3.
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| CN (1) | CN113774286A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102011059A (en) * | 2010-12-29 | 2011-04-13 | 重庆大学 | Smelting technological process of low-silicon low-manganese ultrapure rotor steel |
| CN102382925A (en) * | 2011-11-22 | 2012-03-21 | 宝山钢铁股份有限公司 | Manufacturing method of ultrapurity armco iron |
| CN106566913A (en) * | 2015-10-12 | 2017-04-19 | 宝钢特钢有限公司 | Desulfurizing smelting method for ultra low sulfur pure iron |
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2020
- 2020-06-10 CN CN202010526519.9A patent/CN113774286A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102011059A (en) * | 2010-12-29 | 2011-04-13 | 重庆大学 | Smelting technological process of low-silicon low-manganese ultrapure rotor steel |
| CN102382925A (en) * | 2011-11-22 | 2012-03-21 | 宝山钢铁股份有限公司 | Manufacturing method of ultrapurity armco iron |
| CN106566913A (en) * | 2015-10-12 | 2017-04-19 | 宝钢特钢有限公司 | Desulfurizing smelting method for ultra low sulfur pure iron |
Non-Patent Citations (1)
| Title |
|---|
| 张景海: "二次硬化钢用纯铁的冶炼技术", 《炼钢》 * |
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