CN117568697A - Production method of steel for AP2CRE low-carbon rare earth flange - Google Patents
Production method of steel for AP2CRE low-carbon rare earth flange Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 39
- 239000010959 steel Substances 0.000 title claims abstract description 39
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 19
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 18
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 11
- 238000003723 Smelting Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 9
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 7
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 7
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 4
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 3
- 229910052802 copper Inorganic materials 0.000 claims abstract description 3
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 3
- 238000007670 refining Methods 0.000 claims description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 238000009749 continuous casting Methods 0.000 claims description 13
- 238000010079 rubber tapping Methods 0.000 claims description 13
- 229910045601 alloy Inorganic materials 0.000 claims description 12
- 239000000956 alloy Substances 0.000 claims description 12
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 8
- 239000011574 phosphorus Substances 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 6
- 238000011282 treatment Methods 0.000 claims description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 5
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 5
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 5
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 5
- 239000010459 dolomite Substances 0.000 claims description 5
- 229910000514 dolomite Inorganic materials 0.000 claims description 5
- 239000010436 fluorite Substances 0.000 claims description 5
- 239000004571 lime Substances 0.000 claims description 5
- 229910000720 Silicomanganese Inorganic materials 0.000 claims description 4
- 239000005997 Calcium carbide Substances 0.000 claims description 3
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 230000003749 cleanliness Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000011065 in-situ storage Methods 0.000 claims description 3
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 3
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 claims description 3
- 239000011572 manganese Substances 0.000 claims description 3
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 claims description 3
- 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 3
- 238000009849 vacuum degassing Methods 0.000 claims description 3
- 238000012935 Averaging Methods 0.000 claims description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- 238000005275 alloying Methods 0.000 claims description 2
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 2
- 239000000378 calcium silicate Substances 0.000 claims description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 239000002893 slag Substances 0.000 claims description 2
- 239000011593 sulfur Substances 0.000 claims description 2
- 239000003973 paint Substances 0.000 claims 1
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000004925 denaturation Methods 0.000 description 1
- 230000036425 denaturation Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000009847 ladle furnace Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000012629 purifying agent Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
- B22D11/182—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by measuring temperature
-
- 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
-
- 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
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
-
- 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
- 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
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
-
- 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
- C22C38/02—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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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 discloses a production method of steel for an AP2CRE low-carbon rare earth flange, which comprises the following chemical components in percentage by mass: 0.18 to 0.21 percent of C, 0.18 to 0.27 percent of S i, 0.80 to 0.90 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.020 to 0.050 percent of Al, 10 to 45ppm of RE, less than or equal to 0.20 percent of Cr, less than or equal to 0.20 percent of Cu, less than or equal to N i percent of [ H ] < 2.0ppm, [ O ] < 20ppm, [ N ] < 80ppm, less than or equal to 0.41 percent of CE, and the balance of Fe and unavoidable impurities, and a specific production process is also disclosed. On the premise of the existing process route, the invention adopts a specific smelting process and narrow component control to produce the rare earth flange steel meeting the requirements of customers.
Description
Technical Field
The invention relates to a production method of steel for an AP2CRE low-carbon rare earth flange.
Background
The forged flange is a product with the best mechanical property in flange products, and the raw material of the forged flange is generally a tube blank, and then continuous hammering is carried out after cutting so as to eliminate the defects of segregation, looseness and the like in steel ingots. The price and the mechanical property are one grade higher than those of the common casting flange. The flange is a part for connecting the pipe, the pipe and the valve with each other and is connected with the pipe end; there are also flanges for use in the ports of the apparatus, and the connection between the two apparatus is made by interconnecting the pipes to the pipe ends. Is an accessory product of the pipeline. The main materials of the forged flange are carbon steel, alloy steel and stainless steel. The main standards are national standard, electric standard, american standard, german standard, japanese standard and the like. The main corrosion-resistant treatments are oil coating and zinc coating. The forging flange has better pressure resistance and temperature resistance, and is generally suitable for high-pressure high-temperature working environments.
The rare earth element has the characteristics of extremely strong chemical activity, variable valence state, large atomic size and the like due to the unique outer-layer electronic structure, and becomes an important micro-alloy element of a deep purifying agent of steel, an alterant of inclusion and a high-added-value steel material. A large number of researches prove that the rare earth can effectively improve the heat strength, wear resistance/corrosion resistance and fatigue resistance of steel, improve the hot processing performance and low-temperature performance, and improve the yield, oxidation resistance and the like. The 30ppm rare earth alloy is added into the low-carbon rare earth flange AP2C, so that the processing performance, the low-temperature performance and the corrosion resistance of the flange steel can be effectively improved, and the comprehensive performance of the flange steel is further improved.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a production method of the steel for the AP2CRE low-carbon rare earth flange.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to steel for an AP2CRE low-carbon rare earth flange, which comprises the following chemical components in percentage by mass: 0.18 to 0.21 percent of C, 0.18 to 0.27 percent of S i, 0.80 to 0.905 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.020 to 0.050 percent of Al, 10 to 45ppm of RE, less than or equal to 0.20 percent of Cr, less than or equal to 0.20 percent of Cu, less than or equal to 0.20 percent of Ni, less than or equal to 2.0ppm of [ H ], [ O ] < 20ppm, [ N ] < 80ppm, less than or equal to 0.41 percent of CE, and the balance of Fe and unavoidable impurities;
the production method comprises the following steps:
the continuous casting blank production process comprises the following steps: blast furnace molten iron-molten iron pretreatment-converter top-bottom combined blowing smelting-LF external refining-VD vacuum treatment-continuous casting
1) Converter production
In order to ensure the quality of the product and the accurate control of the components of the finished product, the requirements of molten iron of a converter are as follows: the content of phosphorus is less than or equal to 0.13 percent and the content of sulfur is less than or equal to 0.050 percent by mass percent; adding slag-making auxiliary materials such as lime, dolomite, fluorite and the like in the converter smelting process, and adding ferrosilicon, silicomanganese and aluminum-silicomanganese according to the component requirements of the finished product AP2CRE in the tapping process for deoxidization alloying;
the carbon content, the phosphorus content and the tapping temperature of the molten steel at the end point of the converter are as follows:
tapping temperature is 1600-1650 ℃ and average 1612 ℃; carbon content 0.06-0.10%, average 0.07%; the phosphorus content is 0.011-0.020%, and the average is 0.015%;
2) LF furnace production
The refining in-situ temperature of the LF furnace is 1571-157652 ℃, and the average 1579 ℃; refining off-site temperature 1552-161278 ℃ and average 1587 ℃; refining for 53-73min, and averaging 60min; and fine tuning the components according to the standard component requirements in the later refining stage;
3) Production by VD furnace
The molten steel is subjected to vacuum degassing treatment by a VD furnace, so that the content of harmful gas in the steel is further reduced, the cleanliness of the steel is improved, and the gas content requirement is met: the content of [ O ] is less than or equal to 20ppm; n is less than or equal to 60ppm; [H] less than or equal to 2.5ppm; feeding a calcium silicate wire to denature inclusions; the deep vacuum time required by the VD furnace smelting is more than 13min, the deep vacuum degree is less than or equal to 0.10Kpa, the soft blowing time is 13-15min, and the average time is 14min; soft blowing flow rate is 80-200N l/min, average 140-N l/min, and 30-35Kg rare earth alloy is added after vacuum breaking; the upper stage temperature is 1557-1573 ℃ and the average 1568 ℃;
4) Continuous casting production
The superheat degree in continuous casting production is controlled between 20 ℃ and 33 ℃, and the pulling speed is controlled between 0.62m/min and 0.67 m/min.
Furthermore, 3500-4000kg of lime, 1500-2000kg of dolomite and 1000-2300kg of iron sheet are added according to actual conditions during converter smelting, and silicon manganese and silicon iron are added during tapping.
Further, LF furnace refining carries out slag making by adding auxiliary materials according to molten steel components and temperature change, alloy fine adjustment and heating operation are carried out, 0-80kg of calcium carbide and 0-80kg of fluorite are added, alloy fine adjustment ferromanganese is carried out according to refined in-place components, ferrosilicon is 0-50kg, and aluminum wire is fed for 150m.
Compared with the prior art, the invention has the beneficial technical effects that:
on the premise of the existing process route, special smelting process and narrow component control are adopted to produce the rare earth flange steel meeting the requirements of customers.
Detailed Description
The industrial production process is briefly described as follows:
converter smelting- (LF) ladle furnace refining- (VD) vacuum degassing-continuous casting (280 x 380 mm) -special steel rolling.
More than 10 furnaces are industrially produced, and specific process parameters are controlled as follows:
1) Converter production
3500-4000kg of lime, 1500-2000kg of dolomite and 1000-2300kg of iron sheet are added according to actual conditions during converter smelting, and silicon-manganese and silicon-iron are added during tapping.
The carbon content, phosphorus content (mass percent) and tapping temperature of the molten steel at the end point of the converter are shown in Table 1.
TABLE 1 composition and temperature of converter tapping
| Tapping temperature DEG C | Drawn carbon content% | Phosphorus content of steel tapping% | |
| Minimum value | 1608 | 0.06 | 0.011 |
| Maximum value | 1652 | 0.10 | 0.020 |
| Average value of | 1622 | 0.07 | 0.015 |
2) LF furnace production
LF refining is carried out, auxiliary materials are added for slagging according to the components of molten steel and the temperature change, and alloy fine adjustment and heating operation are carried out. 0-80kg of calcium carbide, 0-80kg of fluorite, 0-100kg of ferromanganese, 0-50kg of ferrosilicon and 150m of aluminum wire are added into the alloy, and the temperature and the treatment time of molten steel are shown in table 2.
Table 2 refining LF furnace temperature control
| Refining in-situ temperature DEG C | Refining leaving temperature DEG C | Refining treatment time min | |
| Minimum value | 1571 | 1582 | 53 |
| Maximum value | 1576 | 1612 | 73 |
| Average value of | 1569 | 1587 | 60 |
3) VD furnace production
The molten steel after ladle LF refining is subjected to vacuum degassing treatment by a VD furnace, so that the content of harmful gas in the steel is further reduced, the cleanliness of the steel is improved, and the gas content requirement is as follows: the content of [ O ] is less than or equal to 20ppm; n is less than or equal to 90ppm; [H] less than or equal to 2.5ppm, and after refining, feeding the silicon-calcium wire 100m for inclusion denaturation. The deep vacuum time of the VD furnace smelting is required to be more than 13min, 20-35Kg of rare earth alloy is added after vacuum breaking, and other technological parameters are shown in Table 3.
TABLE 3 refining VD furnace process control
4) Continuous casting production
The superheat degree in continuous casting production is controlled between 22-33 ℃, the pulling speed is controlled between 0.65m/min and 0.67m/min, and the components (mass percent) of molten steel are controlled as shown in table 4.
TABLE 4 finished product composition (%)
| C | Si | Mn | P | S | Al | RE(ppm) | |
| Minimum value | 0.18 | 0.19 | 0.82 | 0.012 | 0.004 | 0.005 | 15 |
| Maximum value | 0.22 | 0.25 | 0.87 | 0.016 | 0.009 | 0.006 | 32 |
| Average value of | 0.20 | 0.23 | 0.84 | 0.014 | 0.007 | 0.006 | 26 |
5) Surface quality
The surface of the continuous casting blank has no defects such as surface cracks and the like, and completely meets the surface quality requirements of the steel for producing the continuous casting blank for the flange and the hot-rolled round steel.
6) Mechanical properties
TABLE 5 tensile test results
Table 6 round steel normal temperature impact work results
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (3)
1. A production method of steel for an AP2CRE low-carbon rare earth flange is characterized by comprising the following steps: the chemical components of the paint comprise the following components in percentage by mass: 0.18 to 0.21 percent of C, 0.18 to 0.27 percent of Si, 0.80 to 0.90 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.020 to 0.050 percent of Al, 10 to 45ppm of RE, less than or equal to 0.20 percent of Cr, less than or equal to 0.20 percent of Cu, less than or equal to 0.20 percent of Ni, less than or equal to 2.0ppm of [ H ], [ O ] < 20ppm, [ N ] < 80ppm, less than or equal to 0.41 percent of CE, and the balance of Fe and unavoidable impurities;
the production method comprises the following steps:
the continuous casting blank production process comprises the following steps: blast furnace molten iron-molten iron pretreatment-converter top-bottom combined blowing smelting-LF external refining-VD vacuum treatment-continuous casting
1) Converter production
In order to ensure the quality of the product and the accurate control of the components of the finished product, the requirements of molten iron of a converter are as follows: the content of phosphorus is less than or equal to 0.13 percent and the content of sulfur is less than or equal to 0.050 percent by mass percent; adding slag-making auxiliary materials such as lime, dolomite, fluorite and the like in the converter smelting process, and adding ferrosilicon, silicomanganese and aluminum-silicomanganese according to the component requirements of the finished product AP2CRE in the tapping process for deoxidization alloying;
the carbon content, the phosphorus content and the tapping temperature of the molten steel at the end point of the converter are as follows:
tapping temperature is 1600-1650 ℃ and average 1612 ℃; carbon content 0.06-0.10%, average 0.07%; the phosphorus content is 0.011-0.020%, and the average is 0.015%;
2) LF furnace production
The refining in-situ temperature of the LF furnace is 1571-157652 ℃, and the average 1579 ℃; refining off-site temperature 1552-161278 ℃ and average 1587 ℃; refining for 53-73min, and averaging 60min; and fine tuning the components according to the standard component requirements in the later refining stage;
3) Production by VD furnace
The molten steel is subjected to vacuum degassing treatment by a VD furnace, so that the content of harmful gas in the steel is further reduced, the cleanliness of the steel is improved, and the gas content requirement is met: the content of [ O ] is less than or equal to 20ppm; n is less than or equal to 60ppm; [H] less than or equal to 2.5ppm; feeding a calcium silicate wire to denature inclusions; the deep vacuum time required by the VD furnace smelting is more than 13min, the deep vacuum degree is less than or equal to 0.10Kpa, the soft blowing time is 13-15min, and the average time is 14min; the soft blowing flow is 80-200Nl/min, the average 140Nl/min, and 30-35Kg of rare earth alloy is added after vacuum breaking; the upper stage temperature is 1557-1573 ℃ and the average 1568 ℃;
4) Continuous casting production
The superheat degree in continuous casting production is controlled between 20 ℃ and 33 ℃, and the pulling speed is controlled between 0.62m/min and 0.67 m/min.
2. The method for producing the steel for the AP2CRE low-carbon rare earth flange according to claim 1, wherein: 3500-4000kg of lime, 1500-2000kg of dolomite and 1000-2300kg of iron sheet are added according to actual conditions during converter smelting, and silicon-manganese and silicon-iron are added during tapping.
3. The method for producing the steel for the AP2CRE low-carbon rare earth flange according to claim 1, wherein: LF furnace refining carries out slag making by adding auxiliary materials according to molten steel components and temperature change, alloy is subjected to fine adjustment and heating operation, 0-80kg of calcium carbide, 0-80kg of fluorite are added, alloy is subjected to fine adjustment according to refined in-place components, ferromanganese is 0-100kg, ferrosilicon is 0-50kg, and the alloy is fed into an aluminum wire for 150m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311320771.4A CN117568697A (en) | 2023-10-12 | 2023-10-12 | Production method of steel for AP2CRE low-carbon rare earth flange |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311320771.4A CN117568697A (en) | 2023-10-12 | 2023-10-12 | Production method of steel for AP2CRE low-carbon rare earth flange |
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