CN113718085A - Refining method of aluminum deoxidized steel - Google Patents
Refining method of aluminum deoxidized steel Download PDFInfo
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- CN113718085A CN113718085A CN202110944400.8A CN202110944400A CN113718085A CN 113718085 A CN113718085 A CN 113718085A CN 202110944400 A CN202110944400 A CN 202110944400A CN 113718085 A CN113718085 A CN 113718085A
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- steel
- aluminum
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- molten steel
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- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 52
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000007670 refining Methods 0.000 title claims abstract description 21
- 229910000532 Deoxidized steel Inorganic materials 0.000 title claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 68
- 239000010959 steel Substances 0.000 claims abstract description 68
- 229910001200 Ferrotitanium Inorganic materials 0.000 claims abstract description 15
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 11
- 239000002245 particle Substances 0.000 claims description 9
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 7
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 7
- 239000004571 lime Substances 0.000 claims description 7
- 238000003723 Smelting Methods 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 239000005997 Calcium carbide Substances 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 claims description 4
- 238000009489 vacuum treatment Methods 0.000 claims description 4
- 229910000720 Silicomanganese Inorganic materials 0.000 claims description 3
- 238000012840 feeding operation Methods 0.000 claims description 3
- 229910000655 Killed steel Inorganic materials 0.000 claims 4
- 229910006639 Si—Mn Inorganic materials 0.000 claims 1
- 239000010936 titanium Substances 0.000 abstract description 11
- UQZIWOQVLUASCR-UHFFFAOYSA-N alumane;titanium Chemical compound [AlH3].[Ti] UQZIWOQVLUASCR-UHFFFAOYSA-N 0.000 abstract description 3
- 239000002131 composite material Substances 0.000 abstract description 3
- 229910000838 Al alloy Inorganic materials 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 230000003749 cleanliness Effects 0.000 abstract description 2
- 229910044991 metal oxide Inorganic materials 0.000 abstract description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 10
- 238000001514 detection method Methods 0.000 description 6
- 229910052786 argon Inorganic materials 0.000 description 5
- 239000011572 manganese Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000002893 slag Substances 0.000 description 5
- 229910000914 Mn alloy Inorganic materials 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 229910052593 corundum Inorganic materials 0.000 description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- IXQWNVPHFNLUGD-UHFFFAOYSA-N iron titanium Chemical compound [Ti].[Fe] IXQWNVPHFNLUGD-UHFFFAOYSA-N 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000005502 peroxidation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- CADICXFYUNYKGD-UHFFFAOYSA-N sulfanylidenemanganese Chemical compound [Mn]=S CADICXFYUNYKGD-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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
- 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
-
- 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
- C21C7/0006—Adding metallic additives
-
- 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
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The refining method of the aluminum deoxidized steel is characterized in that molten steel is refined through an LF furnace, an aluminum wire is fed into the molten steel for deoxidation in the refining process, and then ferrotitanium is added into the molten steel, wherein the aluminum deoxidized steel contains Al and Ti in parts by weight: 0.02% -0.05%, Ti: 0.02 to 0.05 percent. The invention avoids the formation of a large amount of large-scale non-metallic oxide inclusions easily by using aluminum alloy for deoxidation only through the aluminum-titanium composite deoxidation, and improves the cleanliness of molten steel.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a refining method of aluminum deoxidized steel.
Background
The wind power steel is an important production raw material for manufacturing a tower barrel of a wind generating set, and the service life of the set is directly influenced by the internal quality and the performance of the steel plate. The condition that the TOFD ultrasonic flaw detection of the welding line is unqualified often appears when wind power steel is rolled and bent for welding, and the essential reason is that the aluminum (Al) in the steel plate2O3The quality of the interior of the steel plate is reduced due to the excessive inclusion, so that the production of large and ultra-large inclusions is avoided in the process of smelting molten steel.
Disclosure of Invention
In the process of carrying out aluminum-titanium composite deoxidation on wind power steel, a deoxidation product of titanium can become a nucleation center mixed with manganese sulfide and can also be attached to Al2O3The impurities are dispersed and separated out around the impurities; the fine inclusions can also induce acicular ferrite to be separated out in austenite grains, and the structure is refined, so that the flaw detection qualification rate and the performance index of the wind power steel are improved.
Based on the discovery, the invention provides a refining method of aluminum deoxidized steel, molten steel is refined through an LF furnace, an aluminum wire is fed into the molten steel for deoxidation in the refining process, and then ferrotitanium is added into the molten steel, wherein the aluminum deoxidized steel contains Al and Ti with the contents of Al: 0.02% -0.05%, Ti: 0.02 to 0.05 percent.
Furthermore, when the ferrotitanium alloy is added, 0.3-0.5Kg/t of steel-aluminum particles and 1.5-1.8 Kg/t of steel-calcium carbide are added into the molten steel.
Further, after the aluminum wire feeding operation is carried out, the temperature is increased for 3-7 min, and then the ferrotitanium alloy adding operation is carried out.
Furthermore, the feeding amount of the aluminum wire is 2.5-3 m/t of steel, and the adding amount of the ferrotitanium alloy is 1.2-1.6 Kg/t of steel.
And further, heating the molten steel after the molten steel enters the station, adding a silicon-manganese alloy for pre-deoxidation, feeding an aluminum wire after power transmission is carried out for 8-12 min, and adding lime in batches during power transmission and heating for slagging.
Further, an EAF furnace is adopted for primary smelting of molten steel, and during tapping, 4-5 Kg/t of silicon-manganese alloy steel, 3-4 Kg/t of lime steel and 0.3-0.4 Kg/t of aluminum particles are added.
Further, after refining in the LF furnace, the molten steel is subjected to vacuum treatment in the VD furnace.
Further, the aluminum deoxidized steel comprises the following chemical components in percentage by weight: c: 0.12% -0.15%, Si: 0.20-0.40%, Mn: 1.35-1.50%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, Al: 0.02% -0.05%, Ti: 0.02-0.05 percent, and the balance of Fe and inevitable impurity elements.
The diameter of the aluminum wire is as follows: 11.2-12.3 mm. The titanium content in the ferrotitanium alloy is 33.19 percent. The silicon-manganese alloy contains 17.80% of silicon and 65.12% of manganese.
In the invention, 0.3-0.5Kg/t of steel aluminum particles and 1.5-1.8 Kg/t of steel calcium carbide are added into molten steel while ferrotitanium is added, so that the slag changing operation is carried out.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
1. in the invention, refining is carried out by an LF furnace, silicomanganese is added for pre-deoxidation at the beginning, aluminum wires are fed for strong deoxidation after power is transmitted and temperature is raised for several minutes, and ferrotitanium is added for deoxidation after temperature is raised continuously; the Ti produced after the feeding of the aluminum wire is added2O3Adhesion of previously formed Al2O3Inclusions (not coming to date)Floating fine Al2O3Inclusions) are distributed in the molten steel as fine inclusions.
2. The invention avoids the formation of a large amount of large-scale non-metallic oxide inclusions easily by using aluminum alloy for deoxidation only through the aluminum-titanium composite deoxidation, and improves the cleanliness of molten steel.
3. The wind power steel produced by the invention has qualified chemical components and fine inclusions, and the flaw detection qualification rate of the rolled steel plate reaches more than 99.8 percent.
Detailed Description
One embodiment is as follows.
The produced wind power steel comprises the following chemical components: c: 0.12-0.15%, Si: 0.20 to 0.40%, Mn: 1.35-1.50%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, Al: 0.02-0.05%, and the balance of Fe and inevitable impurity elements;
the production method comprises the working procedures of primary smelting in an EAF furnace, refining in an LF furnace and vacuum treatment in a VD furnace;
the EAF furnace primary smelting process comprises tapping molten steel, wherein C is more than or equal to 0.06% and less than or equal to 0.08%, P is less than or equal to 0.0015%, peroxidation tapping is strictly prohibited for the molten steel, the temperature of the molten steel to a ladle is controlled to be 1550-1580 ℃, silicon and manganese are added for 4-5 Kg/t steel, lime is added for 3-4 Kg/t steel, and aluminum particles are added for 0.3-0.4 Kg/t steel during tapping.
An LF furnace refining process, wherein the temperature of molten steel starts to rise after the molten steel enters a station, firstly, silicon-manganese alloy is added for pre-deoxidation, a strong deoxidizer aluminum wire is fed for 8-12 min after power transmission, 2.5-3 m/t of steel is fed (lime is added in batches during power transmission and temperature rise for slagging), 1.2-1.6 Kg/t of steel titanium iron is added after the temperature rises for 3-5 min, 0.3-0.5Kg/t of steel aluminum particles and 1.5-1.8 Kg/t of steel calcium carbide are added for slag change, and after 5min, the slag is changed into yellow-white and white slag is kept; when the temperature reaches 1600-1620 ℃, strong argon stirring is carried out for 2-4 min, and desulfurization and inclusion removal are carried out; when the white slag is kept for more than or equal to 20min, the molten steel C: 0.11 to 0.12%, Si: 0.18 to 0.22%, Mn: 1.30-1.35%, Al: 0.02-0.05%, Ti: 0.02-0.05%, S is less than or equal to 0.005%, the temperature reaches 1630-1645 ℃, and after LF refining is finished, a VD procedure is performed;
VD vacuum treatment, namely after molten steel enters a station ladle, adding ferrotitanium to adjust the Ti content of the molten steel to 0.025-0.030% (if the Ti content is more than 0.030% after LF is finished, the addition is not needed in the VD process), wherein the flow of argon and the flow of argon is 200-300 NL/min, and the vacuum degree is less than or equal to 66.6Pa, and the treatment time is more than or equal to 15 min; and after the VD breaks the vacuum, feeding 1-1.5 m/t of steel by a calcium wire, then weakly stirring for 8-15 min, not exposing the molten steel, not feeding an aluminum wire before and after the VD vacuum, and when the molten steel reaches the casting required temperature, carrying out ladle casting to obtain a steel billet.
The strong stirring is performed at an argon flow rate of 100 to 150NL/min, and the weak stirring is performed at an argon flow rate of 30 to 50 NL/min.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The chemical components except iron and the weight percentage of the chemical components of the steel plates produced in the examples 1 to 6 are shown in the table 1. According to the production method in the embodiment, the EAF smelting process is carried out, the adding amount of silicomanganese, lime and aluminum particles after tapping is shown in the table 2, the LF process is carried out, the power transmission time t1 before feeding an aluminum wire, the feeding amount of the aluminum wire, the adding amount of ferrotitanium, the adding amount of aluminum particles and the adding amount of calcium carbide are shown in the table 2, and the temperature rise time t2 before feeding the ferrotitanium after feeding the aluminum wire is shown in the table 2.
TABLE 1
TABLE 2
The flaw detection yield of the steel sheets obtained in examples 1 to 6 was 100%.
The flaw detection: the standard adopted by the flaw detection of the steel plate is NB/T47013.3-2015 acceptance level LevelT1 level.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (8)
1. The refining method of the aluminum deoxidized steel is characterized in that molten steel is refined through an LF furnace, an aluminum wire is fed into the molten steel for deoxidation in the refining process, and then ferrotitanium is added into the molten steel, wherein the aluminum deoxidized steel contains Al and Ti in parts by weight: 0.02% -0.05%, Ti: 0.02 to 0.05 percent.
2. The method for refining the aluminum deoxidized steel of claim 1, wherein 0.3 to 0.5Kg/t of steel aluminum particles and 1.5 to 1.8Kg/t of steel calcium carbide are added into the molten steel while the ferrotitanium is added.
3. The method for refining the deoxidized aluminum steel according to claim 1, wherein the temperature is raised for 3-7 min after the aluminum wire feeding operation, and then the ferrotitanium adding operation is performed.
4. The method for refining the deoxidized aluminum steel as claimed in claim 1, wherein the feeding amount of the aluminum wire is 2.5 to 3m/t steel, and the addition amount of the ferrotitanium alloy is 1.2 to 1.6Kg/t steel.
5. The method for refining the deoxidized aluminum steel according to any one of claims 1 to 4, wherein the temperature of molten steel is raised after entering a station, the silicomanganese alloy is added for pre-deoxidation, the aluminum wire feeding operation is performed after power transmission is performed for 8 to 12min, and lime is added in batches during the power transmission temperature raising period for slagging.
6. The method for refining the aluminum killed steel as claimed in any one of claims 1 to 4, wherein the EAF furnace is used for primary smelting of molten steel, and 4 to 5Kg/t of Si-Mn alloy, 3 to 4Kg/t of lime and 0.3 to 0.4Kg/t of aluminum particles are added during tapping.
7. The method for refining the aluminum killed steel as claimed in any one of claims 1 to 4, wherein after the LF furnace is refined, the molten steel is subjected to vacuum treatment by a VD furnace.
8. The method for refining the aluminum killed steel as claimed in any one of claims 1 to 4, wherein the aluminum killed steel comprises the following chemical components by weight percent: c: 0.12% -0.15%, Si: 0.20-0.40%, Mn: 1.35-1.50%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, Al: 0.02% -0.05%, Ti: 0.02-0.05 percent, and the balance of Fe and inevitable impurity elements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110944400.8A CN113718085A (en) | 2021-08-17 | 2021-08-17 | Refining method of aluminum deoxidized steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110944400.8A CN113718085A (en) | 2021-08-17 | 2021-08-17 | Refining method of aluminum deoxidized steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113718085A true CN113718085A (en) | 2021-11-30 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110944400.8A Pending CN113718085A (en) | 2021-08-17 | 2021-08-17 | Refining method of aluminum deoxidized steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113718085A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007177296A (en) * | 2005-12-28 | 2007-07-12 | Jfe Steel Kk | Method for deoxidizing molten steel |
| CN101392308A (en) * | 2007-09-22 | 2009-03-25 | 鞍钢股份有限公司 | Molten steel deoxygenation method for thinning solidification structure |
| CN102277471A (en) * | 2011-08-03 | 2011-12-14 | 攀钢集团成都钢钒有限公司 | Manufacturing method of steel |
| CN102586685A (en) * | 2012-03-01 | 2012-07-18 | 南京钢铁股份有限公司 | Smelting process of steel for high-titanium alloy welding wire |
| CN106011377A (en) * | 2015-10-20 | 2016-10-12 | 南京钢铁股份有限公司 | Control technology for B-class inclusions of low-carbon low-sulfur pipeline steel |
-
2021
- 2021-08-17 CN CN202110944400.8A patent/CN113718085A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007177296A (en) * | 2005-12-28 | 2007-07-12 | Jfe Steel Kk | Method for deoxidizing molten steel |
| CN101392308A (en) * | 2007-09-22 | 2009-03-25 | 鞍钢股份有限公司 | Molten steel deoxygenation method for thinning solidification structure |
| CN102277471A (en) * | 2011-08-03 | 2011-12-14 | 攀钢集团成都钢钒有限公司 | Manufacturing method of steel |
| CN102586685A (en) * | 2012-03-01 | 2012-07-18 | 南京钢铁股份有限公司 | Smelting process of steel for high-titanium alloy welding wire |
| CN106011377A (en) * | 2015-10-20 | 2016-10-12 | 南京钢铁股份有限公司 | Control technology for B-class inclusions of low-carbon low-sulfur pipeline steel |
Non-Patent Citations (1)
| Title |
|---|
| 王新华: "《冶金研究 2005年》", 30 April 2005, 冶金工业出版社 * |
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Application publication date: 20211130 |