CN116287978A - Low-crack-rate carbon structural steel special-shaped blank and production method thereof - Google Patents
Low-crack-rate carbon structural steel special-shaped blank and production method thereof Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 229910000746 Structural steel Inorganic materials 0.000 title claims abstract description 14
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 239000000126 substance Substances 0.000 claims abstract description 13
- 239000012535 impurity Substances 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 239000002893 slag Substances 0.000 claims description 24
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 23
- 238000007670 refining Methods 0.000 claims description 21
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 238000005266 casting Methods 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 208000029154 Narrow face Diseases 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 238000007664 blowing Methods 0.000 claims description 9
- 238000003723 Smelting Methods 0.000 claims description 6
- NCJRLCWABWKAGX-UHFFFAOYSA-N [Si].[Ca].[Ba] Chemical compound [Si].[Ca].[Ba] NCJRLCWABWKAGX-UHFFFAOYSA-N 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 238000003780 insertion Methods 0.000 claims description 6
- 230000037431 insertion Effects 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 claims description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- 102000005298 Iron-Sulfur Proteins Human genes 0.000 claims description 3
- 108010081409 Iron-Sulfur Proteins Proteins 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- CYUOWZRAOZFACA-UHFFFAOYSA-N aluminum iron Chemical compound [Al].[Fe] CYUOWZRAOZFACA-UHFFFAOYSA-N 0.000 claims description 3
- 239000010425 asbestos Substances 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 239000011575 calcium Substances 0.000 claims description 3
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- 238000012360 testing method Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 abstract description 6
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- 229910052757 nitrogen Inorganic materials 0.000 description 2
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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
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- 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
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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Abstract
The invention discloses a low-crack-rate carbon structural steel special-shaped blank, which comprises the following chemical components in percentage by mass: 0.12-0.20% of C, 0.10-0.35% of Si, 0.30-0.70% of Mn, less than or equal to 0.030% of P, less than or equal to 0.008% of S, less than or equal to 0.005% of V, less than or equal to 0.01% of Cr, less than or equal to 0.01% of Ni, less than or equal to 0.01% of Mo, less than or equal to 0.012% of Cu, and the balance of Fe and impurities, wherein the mass fraction is 100% in total. Its preparing process is also disclosed. The crack of the special-shaped blank after rolling is lower than 0.3 percent.
Description
Technical Field
The invention relates to the technical field of smelting, in particular to a low-crack-rate carbon structural steel special-shaped blank and a production method thereof.
Background
The special-shaped blank has complex cross section shape, large difference of heat dissipation speeds at different parts, and poor uniformity of temperature distribution compared with a conventional casting blank, so that the crack sensitivity is enhanced, and the defect proportion of the casting blank is increased. The steel-clad beam blank casting machine mainly uses common carbon steel and low alloy steel as main production materials and is matched with a small amount of weather-resistant steel and high-strength low-temperature-resistant steel, wherein the steel types with the largest yield are Q235B and Q355B. The production rate of the quality defects of the special-shaped blank produced by the special-shaped blank casting machine is far greater than that of the special-shaped blank produced by the conventional casting machine. According to incomplete statistics, the crack rate of the domestic special-shaped blank after rolling is 2% -4%.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a low-crack-rate carbon structural steel special-shaped blank and a production method thereof.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a low-crack-rate carbon structural steel special-shaped blank, which comprises the following chemical components in percentage by mass: 0.12-0.20% of C, 0.10-0.35% of S i, 0.30-0.70% of Mn, less than or equal to 0.030% of P, less than or equal to 0.008% of S, less than or equal to 0.005% of V, less than or equal to 0.01% of Cr, less than or equal to N i, less than or equal to 0.01% of Mo, less than or equal to 0.01% of Cu, less than or equal to 0.012% of N, and the balance of Fe and impurities, wherein the mass fraction is 100% in total.
Further, the chemical components of the material comprise the following components in percentage by mass: 0.13% of C, 0.15% of Si, 0.32% of Mn, 0.023% of P, 0.007% of S, 0.002% of V, 0.003% of Cr, 0.002% of Ni, 0.001% of Mo, 0.003% of Cu, 0.0062% of N and the balance of Fe and impurities, wherein the mass fraction is 100% in total.
Further, the chemical components of the material comprise the following components in percentage by mass: 0.19% of C, 0.33% of Si, 0.68% of Mn, 0.015% of P, 0.005% of S, 0.003% of V, 0.005% of Cr, N i 0.006.006% of Mo, 0.002% of Cu, 0.005% of N, 0.0053% of N, and the balance of Fe and impurities, wherein the mass fraction is 100% in total.
Further, the chemical components of the material comprise the following components in percentage by mass: 0.15% of C, 0.26% of Si, 0.52% of Mn, 0.028% of P, 0.006% of S, 0.005% of V, 0.003% of Cr, 0.004% of N i, 0.001% of Mo, 0.008% of Cu, 0.0048% of N, and the balance of Fe and impurities, wherein the mass fraction is 100% in total.
Further, the chemical components of the material comprise the following components in percentage by mass: 0.17% of C, 0.22% of Si, 0.41% of Mn, 0.012% of P, 0.003% of S, 0.002% of V, 0.001% of Cr, N i 0.003.003% of Mo, 0.001% of Cu, 0.004% of N, 0.0056% of N, and the balance of Fe and impurities, wherein the mass fraction is 100% in total.
A method for producing a low-crack-rate carbon structural steel special-shaped blank comprises the following steps:
smelting in a combined blown converter, wherein molten iron sulfur entering the converter is not more than 0.030%; the iron ball must be added within 5min in the earlier stage, the steel end point component C is more than or equal to 0.06%, T is more than or equal to 1600 ℃, and the alloy is used for baking (hydrogen control), so that the three hit rate of molten steel for refining is ensured, and the refining treatment time is ensured; for refining target components: c is more than or equal to 0.14% and less than or equal to 0.17%, S i is more than or equal to 0.10% and less than or equal to 0.20%, mn is more than or equal to 0.35% and less than or equal to 0.45%, and P is less than 0.030%; the whole process is blocked, and the P difference is less than or equal to 0.004%;
the dislocation S is controlled to be less than or equal to 0.008 percent, the refining soft blowing time is more than or equal to 15min, the early slag formation and the quick slag formation of the refining are ensured, the white slag is realized by the refining slag, and the deoxidizer is deoxidized by aluminum iron, aluminum particles and silicon calcium barium; the consumption of the silicon-calcium-barium per furnace is not more than 50kg, and the superheat degree is controlled: the section superheat degree of BB1, BB2, BB3 and BB4 is less than or equal to 35 ℃; controlling the S content of the finished product to be less than or equal to 0.008 percent and simultaneously meeting the Mn/S value of more than 60; the refining treatment time is more than or equal to 40min, and the steel feeding temperature is 1570-1585 ℃;
the arc alignment precision of the crystallizer and the section I is controlled within 0.2 mm; the casting machine ensures the centering of the water gap and avoids bias flow; strictly executing argon blowing of a long nozzle; the thickness of the tundish slag is not more than 90mm; baking the covering slag before using; ensuring that the water content of the used covering slag is less than or equal to 0.5 percent; the arc alignment of the crystallizer and the sector I section is less than or equal to 0.3mm; ensuring the water blowing effect of the water blower; crystallizer water quantity: the pressure is more than or equal to 0.8mpa, BB1: broad face 1300L/mi n, narrow face 850L/mi n; BB2: broad face 2200L/mi n, narrow face 1200L/mi n; BB3: broad face 2400L/mi n, narrow face 900L/mi n; BB4: 2500L/mi on the wide surface and 1000L/mi on the narrow surface; BB3: broad face 2400L/mi n, narrow face 900L/mi n; BB4: 2500L/mi on the wide surface and 1000L/mi on the narrow surface; the long water gap of the big ladle is protected and poured by an asbestos bowl and an argon seal (the pressure is 1.1Mpa, the flow is 20-30L/s); automatically controlling the liquid level in the crystallizer, and controlling the fluctuation of the liquid level to +/-3 mm; the superheat degree is controlled at 20-35 ℃; long nozzle insertion depth: 150-200mm; the immersion nozzle insertion depth is 50-70mm; drawing speed control BB1 section: 1.0-1.1m/min, BB2 section: 0.75-0.85m/min, BB3 section: 0.75-0.90m/min, BB4 section: 0.7-0.80m/min;
selecting Stoberg L7, and controlling the thickness of the covering slag to 40-50mm;
the quality of the crystallizer and the spray water must meet the standard requirements, the turbidity (NTU) is <10, the calcium hardness (mg/l) is <20, and the total iron (mg/l) is <0.5; the spray water pressure is not lower than 0.80Mpa, the water inlet temperature of the crystallizer is required to be 20-35 ℃, and the water inlet and outlet temperature difference is 4-6 ℃; the opposite arcs of the sections I and I I are not more than 0.5mm, and the vibration polarization test requirement is less than or equal to 0.20mm.
Further, the method is applicable to the sections of the special-shaped blanks of 350X 290X 100mm, 555X 440X 105mm, 730X 370X 90mm and 1024X 390X 120mm.
Compared with the prior art, the invention has the beneficial technical effects that:
the crack of the special-shaped blank after rolling is lower than 0.3 percent.
Drawings
The invention is further described with reference to the following description of the drawings.
FIG. 1 shows the appearance of longitudinal cracks of a casting blank after hot acid corrosion.
Detailed Description
The present invention will be described in further detail below
The low-crack-rate special-shaped blank comprises the following chemical components in percentage by mass: 0.12-0.20% of C, 0.10-0.35% of Si, 0.30-0.70% of Mn, less than or equal to 0.030% of P, less than or equal to 0.008% of S, less than or equal to 0.005% of V, less than or equal to 0.01% of Cr, less than or equal to N i, less than or equal to 0.01% of Mo, less than or equal to 0.01% of Cu, less than or equal to 0.012% of N, and the balance of Fe and impurities, wherein the mass fraction is 100% in total.
A low-crack-rate carbon structural steel special-shaped blank and a production method thereof have the smelting process that: converter smelting, LF refining and beam blank continuous casting.
Smelting in a combined blown converter, wherein molten iron sulfur entering the converter is not more than 0.030%; the iron ball must be added within 5min in the earlier stage, the steel end point component C is more than or equal to 0.06%, T is more than or equal to 1600 ℃, and the alloy is used for baking (hydrogen control), so that the three hit rate of molten steel for refining is ensured, and the refining treatment time is ensured; for refining target components: c is more than or equal to 0.14% and less than or equal to 0.17%, S i is more than or equal to 0.10% and less than or equal to 0.20%, mn is more than or equal to 0.35% and less than or equal to 0.45%, and P is less than 0.030%. The whole process is carried out slag blocking, and the P difference is less than or equal to 0.004 percent.
The dislocation S is controlled to be less than or equal to 0.008 percent, the refining soft blowing time is more than or equal to 15min, the early slag formation and the quick slag formation of the refining are ensured, the white slag is realized by the refining slag, and the deoxidizer is deoxidized by aluminum iron, aluminum particles and silicon calcium barium. The consumption of the silicon-calcium-barium per furnace is not more than 50kg, and the superheat degree is controlled: the section superheat degree of BB1, BB2, BB3 and BB4 is less than or equal to 35 ℃. The S content of the finished product is controlled to be less than or equal to 0.008 percent, and the Mn/S value is satisfied to be more than 60. The refining treatment time is more than or equal to 40min, and the steel feeding temperature is 1570-1585 ℃.
The arc alignment precision of the crystallizer and the section I is controlled within 0.2 mm. The casting machine ensures the centering of the water gap and avoids bias flow. Argon blowing of the long nozzle is strictly performed. The thickness of the tundish slag is not more than 90mm. Baking the covering slag before using; the water content of the used covering slag is ensured to be less than or equal to 0.5 percent. The arc alignment between the crystallizer and the sector I section is less than or equal to 0.3mm. Ensure the water blowing effect of the water blower. Crystallizer water quantity: the pressure is more than or equal to 0.8mpa, BB1: broad face 1300L/mi n, narrow face 850L/mi n; BB2: broad face 2200L/mi n, narrow face 1200L/mi n; BB3: broad face 2400L/mi n, narrow face 900L/mi n; BB4: 2500L/mi on the wide surface and 1000L/mi on the narrow surface; BB3: broad face 2400L/mi n, narrow face 900L/mi n; BB4: 2500L/mi on the wide surface and 1000L/mi on the narrow surface; the long water gap of the big ladle adopts an asbestos bowl and an argon seal (pressure:
1.1Mpa, flow rate: 20-30L/s) for protection casting; the liquid level in the crystallizer is automatically controlled, and the fluctuation of the liquid level is controlled to be +/-3 mm. The superheat degree is controlled at 20-35 ℃. Long nozzle insertion depth: 150-200mm. The immersion nozzle insertion depth is 50-70mm. Drawing speed control BB1 section: 1.0-1.1m/min, BB2 section: 0.75-0.85m/min, BB3 section: 0.75-0.90m/min, BB4 section: 0.7-0.80 m/min.
Further: stoberg L7 (density: 0.89g/ml; melting point: 1241 ℃ C.; viscosity: 7.9Po i se) was selected and the thickness of the mold flux was controlled to 40-50mm.
Further: the quality of the crystallizer and the spray water must meet the standard requirements, the turbidity (NTU) is <10, the calcium hardness (mg/l) is <20, and the total iron (mg/l) is <0.5. The spray water pressure is not lower than 0.80Mpa, the water inlet temperature of the crystallizer is required to be 20-35 ℃, and the water inlet and outlet temperature difference is 4-6 ℃. The opposite arcs of the sections I and I I are not more than 0.5mm, and the vibration polarization test requirement is less than or equal to 0.20mm.
Further: is suitable for the section of special-shaped blanks of 350×290×100mm (BB 1), 555×440×105mm (BB 2), 730×370×90mm (BB 3), 1024×390×120mm (BB 4)
Table 1 chemical composition of examples
TABLE 2 casting blank section, degree of superheat and drawing speed for each example
Table 3 examples are furnace time, start rolling temperature, finish rolling temperature
Table 4 ratio of cracks after rolling
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 (7)
1. A low-crack-rate carbon structural steel special-shaped blank is characterized in that: the chemical components of the material comprise the following components in percentage by mass: 0.12-0.20% of C, 0.10-0.35% of Si, 0.30-0.70% of Mn, less than or equal to 0.030% of P, less than or equal to 0.008% of S, less than or equal to 0.005% of V, less than or equal to 0.01% of Cr, less than or equal to 0.01% of Ni, less than or equal to 0.01% of Mo, less than or equal to 0.012% of Cu, and the balance of Fe and impurities, wherein the mass fraction is 100% in total.
2. The low crack rate carbon structural steel parison of claim 1, wherein: the chemical components of the material comprise the following components in percentage by mass: 0.13% of C, 0.15% of Si, 0.32% of Mn, 0.023% of P, 0.007% of S, 0.002% of V, 0.003% of Cr, 0.002% of Ni, 0.001% of Mo, 0.003% of Cu, 0.0062% of N and the balance of Fe and impurities, wherein the mass fraction is 100% in total.
3. The low crack rate carbon structural steel parison of claim 1, wherein: the chemical components of the material comprise the following components in percentage by mass: 0.19% of C, 0.33% of Si, 0.68% of Mn, 0.015% of P, 0.005% of S, 0.003% of V, 0.005% of Cr, 0.006% of Ni, 0.002% of Mo, 0.005% of Cu, 0.0053% of N, and the balance of Fe and impurities, wherein the mass fraction is 100% in total.
4. The low crack rate carbon structural steel parison of claim 1, wherein: the chemical components of the material comprise the following components in percentage by mass: 0.15% of C, 0.26% of Si, 0.52% of Mn, 0.028% of P, 0.006% of S, 0.005% of V, 0.003% of Cr, 0.004% of Ni, 0.001% of Mo, 0.008% of Cu, 0.0048% of N, and the balance of Fe and impurities, wherein the mass fraction is 100% in total.
5. The low crack rate carbon structural steel parison of claim 1, wherein: the chemical components of the material comprise the following components in percentage by mass: 0.17% of C, 0.22% of Si, 0.41% of Mn, 0.012% of P, 0.003% of S, 0.002% of V, 0.001% of Cr, 0.003% of Ni, 0.001% of Mo, 0.004% of Cu, 0.0056% of N, and the balance of Fe and impurities, wherein the mass fraction is 100% in total.
6. The method for producing a low crack rate carbon structural steel parison according to any one of claims 1 to 5, characterized by: comprising the following steps:
smelting in a combined blown converter, wherein molten iron sulfur entering the converter is not more than 0.030%; the iron ball must be added within 5min in the earlier stage, the steel end point component C is more than or equal to 0.06 percent, T is more than or equal to 1600 ℃, and the alloy is used for baking (hydrogen control), so that the three hit rate of molten steel for refining is ensured, and the refining treatment time is ensured; for refining target components: c is more than or equal to 0.14% and less than or equal to 0.17%, si is more than or equal to 0.10% and less than or equal to 0.20%, mn is more than or equal to 0.35% and less than or equal to 0.45%, and P is less than 0.030%; the whole process is blocked, and the P difference is less than or equal to 0.004%;
the dislocation S is controlled to be less than or equal to 0.008 percent, the refining soft blowing time is more than or equal to 15 minutes, the early slag formation and the quick slag formation of refining are ensured, the refined slag completely realizes white slag, and the deoxidizer is deoxidized by aluminum iron, aluminum particles and silicon calcium barium; the consumption of the silicon-calcium-barium per furnace is not more than 50kg, and the superheat degree is controlled: the section superheat degree of BB1, BB2, BB3 and BB4 is less than or equal to 35 ℃; controlling the S content of the finished product to be less than or equal to 0.008 percent and simultaneously meeting the Mn/S value of more than 60; the refining treatment time is more than or equal to 40min, and the steel feeding temperature is 1570-1585 ℃;
the arc alignment precision of the crystallizer and the section I is controlled within 0.2 mm; the casting machine ensures the centering of the water gap and avoids bias flow; strictly executing argon blowing of a long nozzle; the thickness of the tundish slag is not more than 90mm; baking the covering slag before using; ensuring that the water content of the used covering slag is less than or equal to 0.5 percent; the arc alignment of the crystallizer and the sector I section is less than or equal to 0.3mm; ensuring the water blowing effect of the water blower; crystallizer water quantity: the pressure is more than or equal to 0.8mpa, BB1: broad face 1300L/min and narrow face 850L/min; BB2: broad face 2200L/min and narrow face 1200L/min; BB3: 2400L/min for wide surface and 900L/min for narrow surface; BB4: 2500L/min on the wide surface and 1000L/min on the narrow surface; BB3: 2400L/min for wide surface and 900L/min for narrow surface; BB4: 2500L/min on the wide surface and 1000L/min on the narrow surface; the long water gap of the big ladle is protected and poured by an asbestos bowl and an argon seal (the pressure is 1.1Mpa, the flow is 20-30L/s); automatically controlling the liquid level in the crystallizer, and controlling the fluctuation of the liquid level to +/-3 mm; the superheat degree is controlled at 20-35 ℃; long nozzle insertion depth: 150-200mm; the immersion nozzle insertion depth is 50-70mm; drawing speed control BB1 section: 1.0-1.1m/min, BB2 section: 0.75-0.85m/min, BB3 section: 0.75-0.90m/min, BB4 section: 0.7-0.80m/min;
selecting Stoberg L7, and controlling the thickness of the covering slag to 40-50mm;
the quality of the crystallizer and the spray water must meet the standard requirements, the turbidity (NTU) is <10, the calcium hardness (mg/l) is <20, and the total iron (mg/l) is <0.5; the spray water pressure is not lower than 0.80Mpa, the water inlet temperature of the crystallizer is required to be 20-35 ℃, and the water inlet and outlet temperature difference is 4-6 ℃; the opposite arc of the segment I, II is not more than 0.5mm, and the vibration polarization test requirement is less than or equal to 0.20mm.
7. The production method according to claim 6, wherein: the method is suitable for the sections of the special-shaped blanks of 350X 290X 100mm, 555X 440X 105mm, 730X 370X 90mm and 1024X 390X 120mm.
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