CN114686637B - Method for producing high-alloy non-oriented silicon steel, high-alloy non-oriented silicon steel and application - Google Patents
Method for producing high-alloy non-oriented silicon steel, high-alloy non-oriented silicon steel and application Download PDFInfo
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 67
- 239000000956 alloy Substances 0.000 title claims abstract description 67
- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 60
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims description 79
- 239000010959 steel Substances 0.000 claims description 79
- 239000000126 substance Substances 0.000 claims description 72
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 54
- 238000009749 continuous casting Methods 0.000 claims description 54
- 229910052782 aluminium Inorganic materials 0.000 claims description 50
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 43
- 238000006477 desulfuration reaction Methods 0.000 claims description 33
- 230000023556 desulfurization Effects 0.000 claims description 33
- 239000011572 manganese Substances 0.000 claims description 28
- 229910052742 iron Inorganic materials 0.000 claims description 27
- 239000002893 slag Substances 0.000 claims description 23
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 21
- 229910052760 oxygen Inorganic materials 0.000 claims description 21
- 239000001301 oxygen Substances 0.000 claims description 21
- 229910052751 metal Inorganic materials 0.000 claims description 20
- 239000002184 metal Substances 0.000 claims description 20
- 238000005261 decarburization Methods 0.000 claims description 18
- 239000000498 cooling water Substances 0.000 claims description 16
- 229910052748 manganese Inorganic materials 0.000 claims description 16
- 238000010079 rubber tapping Methods 0.000 claims description 16
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 15
- 239000012535 impurity Substances 0.000 claims description 14
- 229910052718 tin Inorganic materials 0.000 claims description 14
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 12
- 229910052710 silicon Inorganic materials 0.000 claims description 12
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 10
- 238000005096 rolling process Methods 0.000 claims description 10
- 238000009628 steelmaking Methods 0.000 claims description 10
- 229910052717 sulfur Inorganic materials 0.000 claims description 10
- 229910018068 Li 2 O Inorganic materials 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 238000009489 vacuum treatment Methods 0.000 claims description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 8
- 239000010703 silicon Substances 0.000 claims description 8
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 7
- 230000004907 flux Effects 0.000 claims description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 5
- 238000007670 refining Methods 0.000 claims description 5
- 239000011593 sulfur Substances 0.000 claims description 5
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 238000005266 casting Methods 0.000 description 28
- 239000002994 raw material Substances 0.000 description 26
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Classifications
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
-
- 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
-
- 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
-
- 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
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
-
- 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
-
- 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 invention relates to the technical field of metallurgy, in particular to a method for producing high-alloy non-oriented silicon steel, the high-alloy non-oriented silicon steel and application. According to the method, the adding amount, the adding sequence and the adding time of the alloy are optimized, so that the fluctuation interval of the component content of each alloy is effectively reduced, and the accuracy of the component content of each alloy is remarkably improved.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a method for producing high-alloy non-oriented silicon steel, the high-alloy non-oriented silicon steel and application.
Background
Non-oriented silicon steel is an important functional material, is called as a top-quality product in steel products, and the quality level and the performance level of the non-oriented silicon steel are comprehensive manifestations of the whole production level of modern steel plants. With the rising of emerging industries such as electric bicycles, large-scale generators, new energy automobiles, intelligent manufacturing and the like, the high-alloy non-oriented silicon steel is in higher and higher position in a modern industrial system.
In recent years, various large iron and steel enterprises develop high alloy non-oriented silicon steel for manufacturing equipment such as driving motors and large-scale generators. However, the problems of large fluctuation of chemical component content, poor surface quality of continuous casting billets, less continuous casting heat and the like commonly exist in the production process of the high alloy unoriented silicon steel at present.
Disclosure of Invention
Therefore, the invention aims to overcome the defect of large fluctuation of chemical component content in the production process of the existing high-alloy unoriented silicon steel.
The invention aims to overcome the defect of poor surface quality of the continuous casting blank in the production process of the existing high-alloy unoriented silicon steel.
The invention aims to overcome the defect of less continuous casting heat in the production process of the existing high alloy non-oriented silicon steel.
For this purpose, the invention provides a method for producing high alloy non-oriented silicon steel, comprising the following steps:
(1) Tapping by a converter: carrying out converter steelmaking on the molten iron after KR desulfurization, carrying out converter tapping after the converter steelmaking is finished, and adding metallic tin based on the target tin content in the converter tapping process to obtain prealloyed molten steel;
(2) RH refining: RH decarburization treatment is carried out on the pre-alloyed molten steel, after the RH decarburization treatment is finished, metal aluminum is added based on the free oxygen content and the target aluminum content of the molten steel, ferrosilicon and metal manganese are added based on the target silicon content and the target manganese content after circulation for 3-5min, and RH vacuum treatment is carried out, so that alloyed molten steel is obtained;
(3) And (3) continuous casting: repeating the steps (1) and (2) to obtain at least one furnace of alloyed molten steel, and continuously pouring the at least one furnace of alloyed molten steel to obtain a continuous casting blank;
(4) Rolling: and rolling the continuous casting billet to obtain the high-alloy non-oriented silicon steel.
In the invention, the free oxygen content, the target aluminum content, the target silicon content, the target manganese content and the target tin content of molten steel are all weight percent.
Alternatively, the ferrosilicon alloy may include, for example, a ferrosilicon alloy having a relatively high silicon content such as Fe75Si, fe80Si, or the like.
Optionally, the high alloy non-oriented silicon steel comprises the following chemical components in percentage by weight: c:0 to 0.005 percent of Si:2.9 to 3.5 percent of Mn:0.2 to 0.5 percent of Al:0.9 to 1.2 percent, S:0 to 0.0030 percent of Sn:0 to 0.05 percent, and the balance of Fe and unavoidable impurities;
optionally, under the condition that the S content is less than or equal to 0.0015%, the Sn content is less than or equal to 0.02%; when the S content is 0.0015 to 0.0030%, the Sn content is 0.02 to 0.05%.
Optionally, in the step (2), when adding the metal aluminum based on the free oxygen content of the molten steel and the target aluminum content, the addition amount of the metal aluminum is as follows: (free oxygen content of molten steel x a+target aluminum content x b+c) kg/ton, wherein a is 1000-1300, b is 850-1150,0.3-c is 0.7;
alternatively, a=1120, b=1000, c=0.5.
Optionally, in the step (2), the time of the RH decarburization treatment is 12-15min, and the time of the RH vacuum treatment is 35-55 min.
Optionally, in step (3), the continuous casting is performed in the presence of a mold flux comprising the following chemical components in weight percent: caO:28 to 32 percent of SiO 2 ：40～45％、Al 2 O 3 :0～3％、MgO：0～3％、Na 2 O：9～12％、Li 2 O：0.5～5％、F：0～5％、C:0～3％、Fe 2 O 3 0-3% and the balance of impurities.
Optionally, in the step (3), the continuous casting is performed under electromagnetic stirring in a secondary cooling area, wherein the current intensity of the electromagnetic stirring in the secondary cooling area is 400-500A, and the frequency is 5-8 Hz;
optionally, the superheat degree of continuous casting is 10-30 ℃;
optionally, the section of the continuous casting billet is 220 x (800-1400) mm;
optionally, the narrow-side cooling water flow of the crystallizer is 500-600L/min, and the wide-side cooling water flow of the crystallizer is 3000-4000L/min.
Optionally, the method further comprises the operation of performing KR desulfurization treatment on the molten iron to obtain KR desulfurized molten iron: and after the first slag skimming is carried out on the molten iron reaching the KR desulfurization station, carrying out KR desulfurization treatment, standing for 3-5min after the KR desulfurization treatment is finished, and carrying out the second slag skimming to obtain the molten iron after KR desulfurization.
Optionally, the KR desulfurization treatment ensures that the sulfur content in the molten iron is less than or equal to 0.0015 weight percent;
after the second slag skimming, the slag skimming rate of the ladle slag is more than or equal to 90 percent.
The invention also provides high alloy non-oriented silicon steel produced by the method.
The invention also provides application of the high-alloy non-oriented silicon steel in manufacturing an electric device;
alternatively, the use is in the manufacture of a drive motor, a large generator.
The technical scheme of the invention has the following advantages:
1. according to the method for producing the high-alloy non-oriented silicon steel, provided by the invention, the adding amount, the adding sequence and the adding time of the chemical component raw materials are optimized, so that the fluctuation interval of the content of each chemical component is effectively reduced, and the accuracy of the content of each chemical component is obviously improved. Specifically, during alloying, firstly, metal aluminum is added based on the free oxygen content of molten steel and the target aluminum content, so that the metal aluminum can remove free oxygen contained in the molten steel in advance on the premise of meeting the target content of the metal aluminum; after the metal aluminum is added for circulation for 3-5min, the free oxygen contained in the molten steel is fully removed by the metal aluminum, and at the moment, the ferrosilicon alloy and the metal manganese are added based on the target silicon content and the target manganese content, so that the oxidation of Si and Mn can be effectively avoided, and the content of Si and Mn in the non-oriented silicon steel can be reduced. The method can enable the yield of various chemical components except aluminum to be close to 100% under the condition of adding the chemical component raw materials at a time, and can realize the rapid and accurate control of the addition amount of the chemical component raw materials under the condition of higher addition amount of the chemical component raw materials.
2. According to the method for producing the high-alloy non-oriented silicon steel, when the metal aluminum is added based on the free oxygen content of the molten steel and the target aluminum content, the addition amount of the metal aluminum in ton steel is accurately calculated and controlled according to a specific calculation method, so that the free oxygen content in the molten steel is less than or equal to 0.0003wt% after the circulation is carried out for 3-5min, and the purposes of accurately removing the free oxygen in the molten steel and controlling the addition amount of the metal aluminum are achieved.
3. According to the method for producing the high-alloy non-oriented silicon steel, provided by the invention, the specific crystallizer casting powder is used, and the electromagnetic stirring, the superheat degree and the water cooling parameters of the secondary cooling zone are optimized, so that the surface quality of a continuous casting billet in the production process is obviously improved, and the surface quality of the high-alloy non-oriented silicon steel is further improved. Specifically, the mold flux used was Li-containing 2 Low basicity, low melting point mold flux of O, wherein Li 2 O can effectively inhibit high content of Al and SiO 2 Oxidation-reduction reaction occurs, so that the problem that the viscosity of the protecting slag is increased due to the fact that the alkalinity of the protecting slag is increased by oxidation-reduction reaction products is avoided, and the surface quality of the continuous casting blank is affected; by optimizing the electromagnetic stirring and superheat degree of the secondary cooling area, the influence on the surface quality of the continuous casting blank caused by uneven steel water cooling can be effectively avoided; through optimizing the water cooling parameters, the continuous casting blank has proper blank shell thickness in the crystallizer, and the phenomenon of 'convex belly' of the continuous casting blank can be effectively avoided.
4. According to the method for producing the high-alloy non-oriented silicon steel, provided by the invention, the continuous casting heat in the production process of the high-alloy non-oriented silicon steel is obviously improved by improving the desulfurization efficiency, shortening the decarburization time and improving the alloying accuracy, so that the continuous casting heat reaches 6-8 furnaces. Specifically, the desulfurization time can be obviously shortened on the premise of ensuring the desulfurization effect through twice slag skimming and standing treatment; by improving the alloying precision, the precise control of the addition amount of the chemical component raw materials is realized under the condition of higher addition amount of the chemical component raw materials, and the yield of various chemical components except aluminum can be close to 100% by adding the chemical component raw materials once, so that the subsequent repeated addition of the chemical component raw materials (the operations of weighing, feeding, testing and the like are needed for adding the chemical component raw materials) are avoided, and the alloying time is obviously shortened; and the alloying time is further reduced by adding metallic tin in the tapping process of the converter. Therefore, the method of the invention obviously reduces the continuous casting period of molten steel by shortening the desulfurization time, the decarburization time and the alloying time, thereby improving the continuous casting heat.
5. According to the method for producing the high-alloy non-oriented silicon steel, disclosed by the invention, the desulfurization effect is obviously improved through twice slag skimming and standing treatment, so that the magnetism of the high-alloy non-oriented silicon steel can be ensured under the condition of adding a small amount of tin, and the production cost is saved.
6. The method for producing the high-alloy non-oriented silicon steel has the advantages that the surface of the continuous casting billet is free from defects such as pits, scars, cracks and the like, the thickness difference of the narrow surfaces is less than or equal to 3mm, the thickness of the narrow surfaces is uniform, and the weight percentage fluctuation of each chemical component in the continuous casting billet is less than or equal to +/-0.05 percent.
Detailed Description
The following examples are provided for a better understanding of the present invention and are not limited to the preferred embodiments described herein, but are not intended to limit the scope of the invention, any product which is the same or similar to the present invention, whether in light of the present teachings or in combination with other prior art features, falls within the scope of the present invention.
The specific experimental procedures or conditions are not noted in the examples and may be followed by the operations or conditions of conventional experimental procedures described in the literature in this field. The reagents or apparatus used were conventional reagent products commercially available without the manufacturer's knowledge.
Example 1
The embodiment provides a method for producing high-alloy non-oriented silicon steel, which comprises the following steps:
(1) KR desulfurization: after the ladle reaches a KR desulfurization station, carrying out primary slag skimming, then carrying out conventional KR desulfurization treatment to ensure that the sulfur content in the KR desulfurized molten iron is 0.0009-0.0014wt%, standing for 3-5min after desulfurization is finished, and carrying out secondary slag skimming to ensure that the slag skimming rate of the ladle is 94%, thus obtaining KR desulfurized molten iron;
(2) Tapping by a converter: conventional converter steelmaking is carried out on the molten iron after KR desulfurization, converter tapping is carried out after the converter steelmaking is finished, and metal tin is added based on the target tin content in the converter tapping process to obtain prealloyed molten steel;
(3) RH refining: RH decarburization treatment is carried out on the prealloyed molten steel for 12-15min, aluminum particles are added based on the free oxygen content and the target aluminum content of the molten steel after the RH decarburization treatment is finished, and the ton steel addition (kg) calculating method comprises the following steps: adding aluminum particles into the molten steel with the free oxygen content of 1120+the target aluminum content of 1000+0.5, circulating for 3-5min, adding ferrosilicon (Si: 75wt%) and manganese metal based on the target silicon content and the target manganese content, and carrying out RH vacuum treatment for 38-45min to obtain alloyed molten steel;
(4) Pouring: pouring the alloyed molten steel, controlling the superheat degree to be 12-23 ℃ in the pouring process, and adopting high-alloy non-oriented silicon steel special crystallizer casting powder (CaO: 29.4% and SiO) 2 ：44.2％、Al 2 O 3 ：1.6％、MgO：2.3％、Na 2 O：10.5％、Li 2 O：0.8％、F：2.3％、C：2.3％、Fe 2 O 3 :1.5 percent and the rest are impurities), electromagnetic stirring is carried out in a secondary cooling zone (the current intensity is 400A, the frequency is 7 Hz), the section of the continuous casting blank is controlled to be 220 multiplied by 1180mm, the cooling water flow rate of the narrow surface of the crystallizer is 560L/min, and the cooling water flow rate of the wide surface is 3700L/min;
(5) Repeating the steps (1) - (4), and continuously casting to obtain continuous casting blanks, wherein the casting furnace number is 6, the addition condition of chemical component raw materials in each furnace number is shown in table 1, the chemical component yield in each furnace number is shown in table 2, and the chemical components of alloyed molten steel in each furnace number are shown in table 3;
(6) Rolling: and rolling the obtained continuous casting blank to obtain the high-alloy non-oriented silicon steel.
Table 1 example 1 chemical component raw material addition conditions for each heat
Table 2 example 1 yields of chemical Components in Heat
| Casting heat | Al yield, percent | Si yield, percent | Mn yield, percent |
| 1 | 89.6 | 97.1 | 97.2 |
| 2 | 87.5 | 98.3 | 98.9 |
| 3 | 87.8 | 98.7 | 97.6 |
| 4 | 89.8 | 98.6 | 98.3 |
| 5 | 91.3 | 99.3 | 98.3 |
| 6 | 89.5 | 97.7 | 97.9 |
Table 3 weight percentage of chemical composition of alloyed molten steel in each heat of example 1
| Casting heat | C，％ | Si，％ | Mn，％ | S，％ | P，％ | Al，％ | Sn，％ |
| Target content | ≤0.0025 | 3.05 | 0.40 | ≤0.0015 | 0.01-0.02 | 1.05 | 0.01-0.02 |
| 1 | 0.0014 | 3.01 | 0.36 | 0.0008 | 0.011 | 1.01 | 0.013 |
| 2 | 0.0023 | 3.08 | 0.41 | 0.001 | 0.017 | 1.03 | 0.015 |
| 3 | 0.0019 | 3.05 | 0.38 | 0.0012 | 0.012 | 1.03 | 0.018 |
| 4 | 0.0024 | 3.09 | 0.43 | 0.0014 | 0.015 | 1.02 | 0.015 |
| 5 | 0.0017 | 3.03 | 0.41 | 0.0011 | 0.013 | 1.05 | 0.017 |
| 6 | 0.0021 | 3.02 | 0.45 | 0.0013 | 0.018 | 1.04 | 0.02 |
The surface of the continuous casting blank produced in the step (5) of the embodiment has no defects such as pits, scars, cracks and the like, and the thickness difference of the narrow surfaces of the casting blank is 1.4-2.3mm; the fluctuation range of the weight percentage of high content elements such as Al, si and the like of the continuous casting blank is less than or equal to +/-0.05 percent.
The high-alloy non-oriented silicon steel produced by the embodiment comprises the following chemical components in percentage by weight: c:0.0014 to 0.0024 percent, si:3.01-3.09%, mn:0.36-0.45%, al:1.01-1.05%, S:0.0008-0.0014%, sn:0.013-0.020% and the balance of Fe and unavoidable impurities.
Example 2
The embodiment provides a method for producing high-alloy non-oriented silicon steel, which comprises the following steps:
(1) KR desulfurization: after the ladle reaches a KR desulfurization station, carrying out primary slag skimming, then carrying out conventional KR desulfurization treatment to ensure that the sulfur content in the KR desulfurized molten iron is 0.0007-0.0013wt%, standing for 3-5min after desulfurization is finished, and carrying out secondary slag skimming to ensure that the slag skimming rate of the ladle is 97%, thus obtaining KR desulfurized molten iron;
(2) Tapping by a converter: conventional converter steelmaking is carried out on the molten iron after KR desulfurization, converter tapping is carried out after the converter steelmaking is finished, and metal tin is added based on the target tin content in the converter tapping process to obtain prealloyed molten steel;
(3) RH refining: RH decarburization treatment is carried out on the prealloyed molten steel for 12-15min, aluminum particles are added based on the free oxygen content and the target aluminum content of the molten steel after the RH decarburization treatment is finished, and the ton steel addition (kg) calculating method comprises the following steps: adding aluminum particles and circulating for 3-5min after adding ferrosilicon (Si: 75wt%) and manganese metal based on the target silicon content and the target manganese content, and performing RH vacuum treatment for 43-50min to obtain alloyed molten steel;
(4) Pouring: pouring the alloyed molten steel, wherein the superheat degree is controlled to be 15-27 ℃ in the pouring process, and high-alloy non-oriented silicon steel special crystallizer casting powder (CaO: 31.8% and SiO) is adopted 2 ：42.5％、Al 2 O 3 :1.6％、MgO：2.3％、Na 2 O：9.8％、Li 2 O：3.1％、F：0.9％、C:1.3％、Fe 2 O 3 1.9 percent of impurities), electromagnetic stirring in a secondary cooling area (current intensity is 400A, frequency is 7 Hz), controlling the section of a continuous casting blank to be 220 multiplied by 1260mm, controlling the flow rate of cooling water on the narrow surface of a crystallizer to be 520L/min, and controlling the flow rate of cooling water on the wide surface to be 3100L/min;
(5) Repeating the steps (1) - (4), and continuously casting, wherein the casting furnace number is 7 furnaces, the addition condition of chemical component raw materials in each furnace number is shown in table 4, the chemical component yield in each furnace number is shown in table 5, and the chemical components of alloyed molten steel in each furnace number are shown in table 6;
(6) Rolling: and rolling the obtained continuous casting blank to obtain the high-alloy non-oriented silicon steel.
Table 4 chemical component raw material addition conditions for each heat of example 2
TABLE 5 yield of chemical components in each Heat
| Casting heat | Al yield, percent | Si yield, percent | Mn yield, percent |
| 1 | 88.8 | 98.7 | 96.7 |
| 2 | 89.6 | 98.7 | 97.8 |
| 3 | 91.8 | 98.9 | 98.9 |
| 4 | 88.0 | 98.6 | 98.3 |
| 5 | 92.9 | 98.1 | 99.4 |
| 6 | 90.4 | 98.7 | 98.9 |
| 7 | 93.1 | 98.0 | 98.3 |
Table 6 weight percentage of chemical composition of alloyed molten steel in each heat of example 2
| Casting heat | C，％ | Si，％ | Mn，％ | S，％ | P，％ | Al，％ | Sn，％ |
| Target content | ≤0.0025 | 3.25 | 0.3 | 0.0015-0.0030 | 0.01-0.02 | 1.15 | 0.02-0.05 |
| 1 | 0.0014 | 3.22 | 0.27 | 0.0017 | 0.011 | 1.10 | 0.026 |
| 2 | 0.0023 | 3.24 | 0.33 | 0.0019 | 0.017 | 1.15 | 0.037 |
| 3 | 0.0019 | 3.29 | 0.35 | 0.0022 | 0.012 | 1.13 | 0.043 |
| 4 | 0.0024 | 3.27 | 0.25 | 0.0024 | 0.015 | 1.11 | 0.049 |
| 5 | 0.0017 | 3.25 | 0.34 | 0.0029 | 0.013 | 1.17 | 0.042 |
| 6 | 0.0024 | 3.25 | 0.26 | 0.0023 | 0.018 | 1.13 | 0.041 |
| 7 | 0.0023 | 3.2 | 0.32 | 0.0027 | 0.019 | 1.15 | 0.045 |
The surface of the continuous casting blank produced in the step (5) of the embodiment has no defects such as pits, scars, cracks and the like, and the thickness difference of the narrow surfaces of the casting blank is 1.2-3mm; the fluctuation range of the weight percentage of high alloy elements such as Al, si and the like of the continuous casting blank is less than or equal to +/-0.05 percent.
The high-alloy non-oriented silicon steel produced by the embodiment comprises the following chemical components in percentage by weight: c:0.0014 to 0.0024 percent, si:3.20-3.29%, mn:0.25-0.35%, al:1.10-1.17%, S:0.0017 to 0.0029 percent of Sn:0.026-0.049%, and the balance of Fe and unavoidable impurities.
Example 3
The embodiment provides a method for producing high-alloy non-oriented silicon steel, which comprises the following steps:
(1) KR desulfurization: after the ladle reaches a KR desulfurization station, carrying out primary slag skimming, then carrying out conventional KR desulfurization treatment to ensure that the sulfur content in the KR desulfurized molten iron is 0.0007-0.0013wt%, standing for 3-5min after desulfurization is finished, and carrying out secondary slag skimming to ensure that the slag skimming rate of the ladle is 97%, thus obtaining KR desulfurized molten iron;
(2) Tapping by a converter: conventional converter steelmaking is carried out on the molten iron after KR desulfurization, converter tapping is carried out after the converter steelmaking is finished, and metal tin is added based on the target tin content in the converter tapping process to obtain prealloyed molten steel;
(3) RH refining: RH decarburization treatment is carried out on the prealloyed molten steel for 12-15min, aluminum particles are added based on the free oxygen content and the target aluminum content of the molten steel after the RH decarburization treatment is finished, and the ton steel addition (kg) calculating method comprises the following steps: adding ferrosilicon (Si: 75wt%) and manganese metal into molten steel based on target silicon content and target manganese content after 3-5min of circulating aluminum particles, and performing RH vacuum treatment for 45-52min to obtain alloyed molten steel;
(4) Pouring: pouring the alloyed molten steel, wherein the superheat degree is controlled to be 15-27 ℃ in the pouring process, and high-alloy non-oriented silicon steel special crystallizer casting powder (CaO: 28.9% and SiO) is adopted 2 ：42.3％、Al 2 O 3 :0.8％、MgO：1.2％、Na 2 O：11.2％、Li 2 O：0.9％、F：2.3％、C:1.7％、Fe 2 O 3 2.3 percent of impurities) and electromagnetic stirring in a secondary cooling area (current intensity is 400A, frequency is 7 Hz), controlling the section of a continuous casting blank to be 220 multiplied by 1210mm, and controlling the cooling water flow rate of the narrow surface of a crystallizer to be 570L/minThe flow rate of the broad-side cooling water is 3800L/min;
(5) Repeating the steps (1) - (4), and continuously casting, wherein the casting furnace number is 8 furnaces, the addition condition of chemical component raw materials in each furnace number is shown in table 7, the chemical component yield in each furnace number is shown in table 8, and the chemical components of alloyed molten steel in each furnace number are shown in table 9;
(6) Rolling: and rolling the obtained continuous casting blank to obtain the high-alloy non-oriented silicon steel.
TABLE 7 chemical component raw material addition for each Heat
Table 8 example 3 yields of chemical Components in Heat
| Casting heat | Al yield, percent | Si yield, percent | Mn yield, percent |
| 1 | 89.4 | 97.2 | 98.8 |
| 2 | 86.4 | 98.7 | 98.9 |
| 3 | 95.5 | 98.2 | 97.7 |
| 4 | 91.9 | 97.3 | 96.7 |
| 5 | 94.7 | 94.7 | 97.8 |
| 6 | 94.4 | 98.6 | 98.9 |
| 7 | 94.8 | 96.0 | 98.3 |
| 8 | 91.0 | 99.3 | 99.4 |
Table 9 weight percentage of chemical composition of alloyed molten steel in each heat of example 3
The surface of the continuous casting blank produced in the step (5) of the embodiment has no defects such as pits, scars, cracks and the like, and the thickness difference of the narrow surfaces of the casting blank is 0.5-2.5mm; the fluctuation range of the weight percentage of high alloy elements such as Al, si and the like of the continuous casting blank is less than or equal to +/-0.05 percent.
The high-alloy non-oriented silicon steel produced by the embodiment comprises the following chemical components in percentage by weight: c:0.0014 to 0.0024 percent, si:3.01-3.09%, mn:0.34-0.44%, al:1.1-1.2%, S:0.0015 to 0.0029 percent of Sn:0.026-0.05%, and the balance of Fe and unavoidable impurities.
Example 4
A high alloy non-oriented silicon steel was produced as in example 1, except that: in the embodiment, the calculation method of the aluminum particle addition amount (kg) of each ton of molten steel comprises the following steps: molten steel free oxygen content×1050+target aluminum content×1020+0.4.
In this example, the addition of the raw materials for chemical components in each heat is shown in Table 10, the yield of chemical components in each heat is shown in Table 11, and the chemical components of the alloyed molten steel in each heat are shown in Table 12.
Table 10 chemical component raw material addition conditions for each heat
Table 11 yield of chemical Components in Each Heat example 4
Table 12 weight percentage of chemical composition of alloyed molten steel in each heat of example 4
| Casting heat | C，％ | Si，％ | Mn，％ | S，％ | P，％ | Al，％ | Sn，％ |
| Target content | ≤0.0025 | 3.05 | 0.40 | ≤0.0015 | 0.01-0.02 | 1.05 | 0.01-0.02 |
| 1 | 0.0015 | 3.03 | 0.37 | 0.0009 | 0.015 | 1.01 | 0.014 |
| 2 | 0.0023 | 3.05 | 0.43 | 0.0008 | 0.018 | 1.02 | 0.017 |
| 3 | 0.0019 | 3.00 | 0.36 | 0.0011 | 0.019 | 1.03 | 0.019 |
| 4 | 0.0022 | 3.02 | 0.45 | 0.0013 | 0.017 | 1.04 | 0.018 |
| 5 | 0.0018 | 3.02 | 0.39 | 0.0012 | 0.014 | 1.01 | 0.016 |
| 6 | 0.0016 | 3.01 | 0.4 | 0.0014 | 0.013 | 1.02 | 0.014 |
The high-alloy non-oriented silicon steel produced by the embodiment comprises the following chemical components in percentage by weight: c:0.0015-0.0023%, si:3.00-3.05%, mn:0.37-0.45%, al:1.01-1.04%, S:0.0009-0.0014%, sn:0.014-0.019%, the balance being Fe and unavoidable impurities.
Example 5
A high alloy non-oriented silicon steel was produced as in example 1, except that: in the embodiment, the calculation method of the aluminum particle addition amount (kg) of each ton of molten steel comprises the following steps: the free oxygen content of molten steel is multiplied by 1170+target aluminum content multiplied by 980+0.7.
In this example, the addition of the raw materials for chemical components in each heat is shown in Table 13, the yield of chemical components in each heat is shown in Table 14, and the chemical components of the alloyed molten steel in each heat are shown in Table 15.
Table 13 chemical component raw material addition conditions for each heat of example 5
Table 14 yield of chemical Components in example 5 Heat
| Casting heat | Al yield, percent | Si yield, percent | Mn yield, percent |
| 1 | 79.8 | 99.7 | 97.2 |
| 2 | 81.2 | 98.0 | 99.9 |
| 3 | 85.5 | 97.2 | 98.5 |
| 4 | 85.4 | 97.5 | 96.7 |
| 5 | 86.3 | 97.3 | 98.6 |
| 6 | 81.9 | 97.3 | 96.3 |
Table 15 weight percentage of chemical composition of alloyed molten steel in each heat of example 5
| Casting heat | C，％ | Si，％ | Mn，％ | S，％ | P，％ | Al，％ | Sn，％ |
| Target content | ≤0.0025 | 3.05 | 0.40 | ≤0.0015 | 0.01-0.02 | 1.05 | 0.01-0.02 |
| 1 | 0.0023 | 3 | 0.37 | 0.0007 | 0.012 | 1.00 | 0.013 |
| 2 | 0.0016 | 3.02 | 0.36 | 0.0009 | 0.014 | 1.01 | 0.014 |
| 3 | 0.0019 | 3.01 | 0.39 | 0.0012 | 0.018 | 1.03 | 0.017 |
| 4 | 0.0020 | 3.02 | 0.43 | 0.0013 | 0.018 | 1.02 | 0.019 |
| 5 | 0.0018 | 3.03 | 0.44 | 0.0014 | 0.019 | 1.04 | 0.016 |
| 6 | 0.0024 | 3.04 | 0.45 | 0.0009 | 0.017 | 1.01 | 0.015 |
The high-alloy non-oriented silicon steel produced by the embodiment comprises the following chemical components in percentage by weight: c:0.0016 to 0.0024 percent, si:3.00-3.04%, mn:0.36-0.45%, al:1.00-1.04%, S:0.0007-0.0014%, sn:0.013-0.019%, and the balance of Fe and unavoidable impurities.
Example 6
A high alloy non-oriented silicon steel was produced as in example 1, except that: the mold flux used in this example was CaO:28%, siO 2 ：40％、Al 2 O 3 :3％、MgO：3％、Na 2 O：12％、Li 2 O：5％、F：5％、C:0.1％、Fe 2 O 3 0.1 percent of the total weight of the catalyst, and the other components are impurities. The surface of the continuous casting billet produced in the step (5) of the embodiment has no defects such as pits, scars, cracks and the like.
Example 7
A high alloy non-oriented silicon steel was produced as in example 1, except that: the mold flux used in this example was CaO:32%, siO 2 ：45％、Al 2 O 3 :0.1％、MgO：0.1％、Na 2 O：9％、Li 2 O：0.5％、F：0.1％、C:3％、Fe 2 O 3 3 percent and the other is impurity. The surface of the continuous casting billet produced in the step (5) of the embodiment has no defects such as pits, scars, cracks and the like.
Example 8
A high alloy non-oriented silicon steel was produced as in example 1, except that: in the embodiment, the continuous casting superheat degree is 15-28 ℃, the narrow-side cooling water flow rate of the crystallizer is 500L/min, and the wide-side cooling water flow rate of the crystallizer is 4000L/min. The surface of the continuous casting blank produced in the step (5) of the embodiment has no defects such as pits, scars, cracks and the like, and the thickness difference of the narrow surfaces of the casting blank is 1.2-2.6mm.
Example 9
A high alloy non-oriented silicon steel was produced as in example 1, except that: in the embodiment, the superheat degree of continuous casting is 12-25 ℃, the cooling water flow rate of the narrow surface of the crystallizer is 600L/min, and the cooling water flow rate of the wide surface of the crystallizer is 3000L/min. The surface of the continuous casting blank produced in the step (5) of the embodiment has no defects such as pits, scars, cracks and the like, and the thickness difference of the narrow surfaces of the casting blank is 0.7-2.9mm.
Comparative example 1
The method of example 1 was used to produce high alloy non-oriented silicon steel, except that: in the comparative example, the step (3) is as follows:
RH decarburization treatment is carried out on the prealloyed molten steel for 18-20min, aluminum particles, ferrosilicon alloy (Si: 75wt%) and manganese metal are added according to the target content after the RH decarburization treatment is finished, the molten steel circulates in a vacuum tank for 5-8min, the weight percentage content of Al, si and Mn in the molten steel is detected, corresponding chemical component raw materials are added under the condition that the detection does not reach the standard, after the alloy is added, the circulation is carried out for 5-8min, the detection is continued until the weight percentage content of each chemical component reaches the standard, and the RH vacuum treatment is carried out for 60-80min, so that the alloying molten steel is obtained.
In the step (5) of the comparative example, the continuous casting heat was 2 heats. The chemical component raw materials were added for the first time, the chemical component raw materials in each heat were added as shown in table 16, the chemical component yields in each heat were shown in table 17, and the chemical components of the alloyed molten steel finally obtained in each heat were shown in table 18.
Table 16 comparative example 1 addition of raw materials of first chemical composition for each heat
Table 17 comparative example 1 first chemical component yield per heat
| Casting heat | Al yield, percent | Si yield, percent | Mn yield, percent |
| 1 | 87.2 | 88.3 | 94.7 |
| 2 | 85.3 | 87.3 | 95.5 |
Table 18 comparative example 1 chemical composition weight percentage of final alloyed molten steel for each heat
| Casting heat | C，％ | Si，％ | Mn，％ | S，％ | P，％ | Al，％ | Sn，％ |
| Target content | ≤0.0025 | 3.05 | 0.40 | ≤0.0015 | 0.01-0.02 | 1.05 | 0.01-0.02 |
| 1 | 0.0022 | 3.12 | 0.38 | 0.0008 | 0.015 | 0.92 | 0.018 |
| 2 | 0.0017 | 2.95 | 0.45 | 0.0014 | 0.018 | 1.07 | 0.015 |
Comparative example 2
The method of example 1 was used to produce high alloy non-oriented silicon steel, except that: in the comparative example, the step (3) is as follows:
RH decarburization treatment is carried out on the prealloyed molten steel for 12-15min, ferrosilicon (Si: 75wt%) and manganese metal are added according to the target content after the RH decarburization treatment is finished, aluminum particles are added according to the free oxygen content and the target aluminum content of the molten steel after circulation for 5-8min, and the ton steel addition (kg) calculation method comprises the following steps: free oxygen content of molten steel is multiplied by 11.2+target aluminum content is multiplied by 10+0.5; and then, after circulating for 5-8min, detecting the weight percentage of Al, si and Mn in the molten steel, and adding corresponding chemical component raw materials under the condition that the detection does not reach the standard, until the weight percentage of each chemical component reaches the standard, carrying out RH vacuum treatment for 50-60min, and obtaining the alloyed molten steel.
In the step (5) of the comparative example, the continuous casting heat was 3 heats. The addition of the chemical component raw materials in each heat is shown in table 19, the chemical component yield in each heat is shown in table 20, and the chemical components of the alloyed molten steel finally obtained in each heat are shown in table 21.
Table 19 comparative example 2 addition of raw materials of first chemical composition for each heat
Table 20 comparative example 2 first chemical component yield per heat
| Casting heat | Al yield, percent | Si yield, percent | Mn yield, percent |
| 1 | 85.1 | 91.2 | 94.1 |
| 2 | 81.4 | 89.7 | 93.2 |
| 3 | 78.3 | 88.9 | 94.9 |
Table 21 comparative example 2 chemical composition weight percentage of final alloyed molten steel for each heat
| Casting heat | C，％ | Si，％ | Mn，％ | S，％ | P，％ | Al，％ | Sn，％ |
| Target content | ≤0.0025 | 3.05 | 0.40 | ≤0.0015 | 0.01-0.02 | 1.05 | 0.01-0.02 |
| 1 | 0.0015 | 2.95 | 0.37 | 0.0013 | 0.015 | 0.93 | 0.015 |
| 2 | 0.0022 | 3.07 | 0.43 | 0.0008 | 0.017 | 1.08 | 0.017 |
| 3 | 0.0009 | 3.01 | 0.45 | 0.0007 | 0.019 | 0.98 | 0.014 |
Comparative example 3
A high alloy non-oriented silicon steel was produced as in example 1, except that: the mold flux used in this comparative example does not contain Li 2 O. The surface of the continuous casting billet produced in the step (5) of the comparative example has defects such as pits, cracks and the like, and even steel leakage and the like occur.
Comparative example 4
A high alloy non-oriented silicon steel was produced as in example 1, except that: in the comparative example, the superheat degree of continuous casting is 30-40 ℃, the cooling water flow rate of the narrow surface of the crystallizer is 650L/min, and the cooling water flow rate of the wide surface of the crystallizer is 4100L/min. The surface of the continuous casting blank produced in the step (5) of the comparative example has defects such as pits, scars and the like, and the thickness difference of the narrow surfaces of the casting blank is 5.5-8.3mm.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (4)
1. A method for producing high alloy non-oriented silicon steel, characterized in that the method is capable of continuous casting 6 to 8 heats, comprising the steps of:
(1) Tapping by a converter: carrying out primary slag skimming on the molten iron reaching the KR desulfurization station, carrying out KR desulfurization treatment, standing for 3-5min after the KR desulfurization treatment is finished, and carrying out secondary slag skimming to obtain molten iron after KR desulfurization; wherein, the KR desulfurization treatment ensures that the sulfur content in the molten iron is less than or equal to 0.0015 weight percent; after the second slag skimming, the slag skimming rate of the ladle slag is more than or equal to 90 percent;
carrying out converter steelmaking on the molten iron after KR desulfurization, carrying out converter tapping after the converter steelmaking is finished, and adding metallic tin based on the target tin content in the converter tapping process to obtain prealloyed molten steel;
(2) RH refining: RH decarburization treatment is carried out on the pre-alloyed molten steel, after the RH decarburization treatment is finished, metal aluminum is added based on the free oxygen content and the target aluminum content of the molten steel, ferrosilicon and metal manganese are added based on the target silicon content and the target manganese content after circulation for 3-5min, and RH vacuum treatment is carried out, so that alloyed molten steel is obtained;
wherein the RH decarburization treatment time is 12-15min, and the RH vacuum treatment time is 35-55 min; when adding metal aluminum based on the free oxygen content of molten steel and the target aluminum content, the addition amount of the metal aluminum is as follows: (free oxygen content of molten steel x a+target aluminum content x b+c) kg/ton steel, wherein a is 1000-1300, b is 850-1150,0.3-c is 0.7;
(3) And (3) continuous casting: repeating the steps (1) and (2) to obtain at least one furnace of alloyed molten steel, and continuously pouring the at least one furnace of alloyed molten steel to obtain a continuous casting blank;
wherein the continuous casting is performed in the presence of a mold flux comprising the following chemical components in weight percent: caO:28 to 32 percent of SiO 2 ：40～45%、Al 2 O 3 : 0~3%、MgO：0～3%、Na 2 O：9～12%、 Li 2 O：0.5～5%、F：0～5%、C:0~3%、Fe 2 O 3 0-3% of the total amount of the components, and the balance of impurities;
the continuous casting is carried out under electromagnetic stirring of a secondary cooling area, the current intensity of the electromagnetic stirring of the secondary cooling area is 400-500A, and the frequency is 5-8 Hz;
the continuous casting superheat degree is 10-30 ℃;
the section of the continuous casting billet is 220X (800-1400) mm;
the flow rate of cooling water on the narrow side of the crystallizer is 500-600L/min, and the flow rate of cooling water on the wide side of the crystallizer is 3000-4000L/min;
(4) Rolling: rolling the continuous casting billet to obtain the high-alloy non-oriented silicon steel;
wherein, the high alloy non-oriented silicon steel comprises the following chemical components in percentage by weight: c:0 to 0.005 percent of Si:2.9 to 3.5 percent of Mn:0.2 to 0.5 percent of Al:0.9 to 1.2 percent, S:0 to 0.0030 percent of Sn:0 to 0.05 percent, and the balance of Fe and unavoidable impurities.
2. The method according to claim 1, wherein the Sn content is less than or equal to 0.02% in the case where the S content is less than or equal to 0.0015%; when the S content is 0.0015 to 0.0030%, the Sn content is 0.02 to 0.05%.
3. High alloy non-oriented silicon steel produced by the method of claim 1 or 2.
4. Use of the high alloy non-oriented silicon steel as set forth in claim 3 in the manufacture of electrical devices.
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| CN109943766A (en) * | 2019-04-30 | 2019-06-28 | 马鞍山钢铁股份有限公司 | A kind of transformer non-orientation silicon steel and preparation method thereof |
| CN112899552A (en) * | 2021-01-21 | 2021-06-04 | 江苏省沙钢钢铁研究院有限公司 | Method for controlling inclusions in ultra-low-aluminum non-oriented silicon steel |
| CN113996771A (en) * | 2021-11-12 | 2022-02-01 | 江苏嘉耐高温材料股份有限公司 | Pre-melted crystallizer casting powder for non-oriented silicon steel and preparation method thereof |
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| CN108660294A (en) * | 2018-05-31 | 2018-10-16 | 江苏省沙钢钢铁研究院有限公司 | A kind of silicomanganese calmness non-orientation silicon steel inclusion control method |
| CN109943766A (en) * | 2019-04-30 | 2019-06-28 | 马鞍山钢铁股份有限公司 | A kind of transformer non-orientation silicon steel and preparation method thereof |
| CN112899552A (en) * | 2021-01-21 | 2021-06-04 | 江苏省沙钢钢铁研究院有限公司 | Method for controlling inclusions in ultra-low-aluminum non-oriented silicon steel |
| CN113996771A (en) * | 2021-11-12 | 2022-02-01 | 江苏嘉耐高温材料股份有限公司 | Pre-melted crystallizer casting powder for non-oriented silicon steel and preparation method thereof |
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Address after: Shagang science and technology building, Yongxin Road, Jinfeng Town, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee after: INSTITUTE OF RESEARCH OF IRON & STEEL, JIANGSU PROVINCE/SHA-STEEL, Co.,Ltd. Country or region after: China Patentee after: JIANGSU SHAGANG GROUP Co.,Ltd. Patentee after: Jiangsu Shagang Steel Co.,Ltd. Address before: Shagang science and technology building, Yongxin Road, Jinfeng Town, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee before: INSTITUTE OF RESEARCH OF IRON & STEEL, JIANGSU PROVINCE/SHA-STEEL, Co.,Ltd. Country or region before: China Patentee before: JIANGSU SHAGANG GROUP Co.,Ltd. Patentee before: ZHANGJIAGANG HONGCHANG STEEL PLATE Co.,Ltd. |
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| CP03 | Change of name, title or address |