CN116770009A - Large carbon-manganese steel tube plate steel ingot and production method thereof - Google Patents
Large carbon-manganese steel tube plate steel ingot and production method thereof Download PDFInfo
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- CN116770009A CN116770009A CN202310891276.2A CN202310891276A CN116770009A CN 116770009 A CN116770009 A CN 116770009A CN 202310891276 A CN202310891276 A CN 202310891276A CN 116770009 A CN116770009 A CN 116770009A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 167
- 239000010959 steel Substances 0.000 title claims abstract description 167
- 229910000617 Mangalloy Inorganic materials 0.000 title claims abstract description 43
- QFGIVKNKFPCKAW-UHFFFAOYSA-N [Mn].[C] Chemical compound [Mn].[C] QFGIVKNKFPCKAW-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 239000011575 calcium Substances 0.000 claims abstract description 71
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 68
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 61
- 239000000463 material Substances 0.000 claims abstract description 22
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000005266 casting Methods 0.000 claims abstract description 17
- 238000007670 refining Methods 0.000 claims abstract description 15
- 238000007664 blowing Methods 0.000 claims abstract description 14
- 238000009849 vacuum degassing Methods 0.000 claims abstract description 11
- 229910052786 argon Inorganic materials 0.000 claims abstract description 9
- 238000010079 rubber tapping Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000003723 Smelting Methods 0.000 claims abstract description 6
- 238000009842 primary steelmaking Methods 0.000 claims abstract description 5
- 239000002893 slag Substances 0.000 claims description 13
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 10
- WNQQFQRHFNVNSP-UHFFFAOYSA-N [Ca].[Fe] Chemical compound [Ca].[Fe] WNQQFQRHFNVNSP-UHFFFAOYSA-N 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 7
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 7
- 239000004571 lime Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 5
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 15
- 238000005242 forging Methods 0.000 abstract description 13
- 238000001514 detection method Methods 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 5
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 abstract 1
- 230000008569 process Effects 0.000 description 11
- 229910052717 sulfur Inorganic materials 0.000 description 9
- 239000011572 manganese Substances 0.000 description 8
- 238000007254 oxidation reaction Methods 0.000 description 7
- 230000003647 oxidation Effects 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 238000007711 solidification Methods 0.000 description 6
- 230000008023 solidification Effects 0.000 description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000011593 sulfur Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000007872 degassing Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052748 manganese Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000011819 refractory material Substances 0.000 description 3
- CADICXFYUNYKGD-UHFFFAOYSA-N sulfanylidenemanganese Chemical compound [Mn]=S CADICXFYUNYKGD-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 239000010425 asbestos Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 229910052895 riebeckite Inorganic materials 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229910052596 spinel Inorganic materials 0.000 description 2
- 239000011029 spinel Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- -1 equipment Substances 0.000 description 1
- 238000012840 feeding operation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000007704 transition Effects 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/06—Vacuum casting, i.e. making use of vacuum to fill the mould
-
- 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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- 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
- C21C7/10—Handling in a vacuum
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to the technical field of metallurgy, in particular to a large carbon-manganese steel tube plate steel ingot and a production method thereof; the method comprises the following steps: smelting in an electric furnace to obtain primary steelmaking water; adding a slag-forming material and a deoxidizer into the primary steelmaking water for refining to obtain refined molten steel; carrying out vacuum degassing treatment on the refined molten steel to obtain degassed refined molten steel; feeding a calcium wire into the degassed refined molten steel, blowing argon gas, soft blowing, and tapping to obtain finished molten steel, wherein the mass fraction of calcium in the finished molten steel is 0.0026-0.0045%; vacuum casting is carried out on the finished molten steel to obtain a large carbon-manganese steel tube plate steel ingot; by adopting the method provided by the invention, the flaw detection defect of the large carbon manganese steel forging can be reduced.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a large carbon-manganese steel tube plate steel ingot and a production method thereof.
Background
The main alloy element in the carbon-manganese steel is Mn, and Mn has obvious solid solution strengthening effect on ferrite; mn can also reduce the cold embrittlement transition temperature of the steel, and increase the relative amount of pearlite in the steel, thereby further improving the strength of the steel. However, the carbon-manganese steel has higher manganese content, and the affinity of manganese and sulfur is stronger than that of iron and sulfur, so that sulfur in the steel exists in a MnS form, the melting point of pure manganese sulfide is 1610 ℃, the pure manganese sulfide is distributed in grains in a granular form after crystallization, and the pure manganese sulfide has enough toughness, is easy to deform and expand into large-size strip-shaped inclusions in the forging process, and becomes a crack source and an expansion channel. When the tube plate forging for the petrochemical container with the carbon content of 0.16-0.20% and the Mn content of 1.0-1.6% is manufactured by steel ingots, the steel ingot has a relatively large ingot shape (more than 200t and can also be called as a large carbon manganese steel tube plate steel ingot), so that the solidification and cooling speed of the steel ingot is relatively low, the precipitation of MnS and large-particle composite inclusions thereof is very serious, the unidirectional forging of the steel ingot is relatively large, the MnS inclusions are easily forged into large-size lath defects during forging, and the ultrasonic flaw detection of the forging is extremely difficult to pass.
Disclosure of Invention
The invention solves the technical problems that: the large carbon-manganese steel tube plate steel ingot for the petrochemical container has the advantages that the steel ingot is large, the solidification and cooling speed of the steel ingot is low, the precipitation of MnS and large-particle composite inclusions of the MnS is very serious, the unidirectional forging of the steel ingot is relatively large during forging, the MnS inclusions are easy to forge into large-sized lath defects, and the ultrasonic flaw detection of a forge piece is extremely difficult to pass.
In order to solve the technical problems, the invention adopts the following technical scheme:
a production method of a large carbon-manganese steel tube plate steel ingot comprises the following steps:
s1, smelting in an electric furnace to obtain primary molten steel;
s2, adding a slag-forming material and a deoxidizer into the primary steelmaking water for refining to obtain refined molten steel;
s3, carrying out vacuum degassing treatment on the refined molten steel to obtain degassed refined molten steel;
s4, feeding a calcium wire into the degassed refined molten steel, blowing argon for soft blowing, and tapping to obtain finished molten steel, wherein the mass fraction of calcium in the finished molten steel is 0.0026-0.0045%;
s5, vacuum casting is carried out on the finished molten steel to obtain a large carbon-manganese steel tube plate steel ingot; the large carbon-manganese steel tube plate steel ingot comprises the following components in percentage by mass: c:0.16-0.20%, si:0.15-0.60%, mn:1.0 to 1.6 percent, P is less than or equal to 0.030 percent, and S is less than or equal to 0.020 percent.
Optionally, in the step S4, the calcium wire is a calcium-iron cored wire, and the mass fraction of calcium in the calcium-iron cored wire is 30-50%.
Optionally, in the step S4, the temperature of the degassed refined molten steel is 1590 to 1600 ℃ during the feeding of the calcium line to the degassed refined molten steel.
Optionally, in the step S4, when a calcium line is fed into the degassed refined molten steel, the oxygen content in the degassed refined molten steel is less than 0.0020%.
Optionally, in the step S2, in mass percentThe slag forming material comprises the following components: caO:50-55% of Al 2 O 3 ：30-35％、SiO 2 :2-6% and MgO:4-8%, and the melting temperature of the refining slag formed by the slag forming material is 1300-1400 ℃.
Optionally, the slag-forming material comprises lime and alumina powder, and the adding amount of the slag-forming material is 20-30 kg/ton of primary molten steel.
Optionally, in the step S5, the temperature of the vacuum casting is 1550-1560 ℃.
Optionally, in the step S4, the time of soft blowing of argon is 5-10min.
Optionally, in the step S2, the deoxidizer is an aluminum material.
The invention also provides a large carbon-manganese steel tube plate steel ingot, which is manufactured by adopting the production method of the large carbon-manganese steel tube plate steel ingot.
Compared with the prior art, the invention provides a large carbon-manganese steel tube plate steel ingot and a production method thereof, wherein the method is characterized in that calcium treatment is carried out on refined molten steel by feeding calcium wires with specific weight into the refined molten steel after vacuum degassing, on one hand, the binding capacity of Ca and O is stronger than that of Al, and solid alumina inclusion is modified into liquid calcium aluminate inclusion by feeding the calcium wires, so that the liquid inclusion is not easy to polymerize in the solidification process of the steel ingot; on the other hand, the binding capacity of Ca and S is stronger than that of Mn, tiny high-melting-point CaS is generated in advance in molten steel, the generation of large-size pure MnS in the molten steel solidification process can be inhibited, that is, the MnS is modified into tiny and single CaS phases or (Ca, mn) S compounds are equal, the formation of MnS inclusion with a large length-width ratio in the steel ingot processing deformation process can be avoided, and therefore the defect of flaw detection of large-size carbon manganese steel forgings is reduced. In addition, when the calcium content fed into refined molten steel after vacuum degassing is too low, high-melting solid inclusions CaO.6Al may be formed in the molten steel 2 O 3 And CaO.2Al 2 O 3 Because these solid inclusions are tougher than alumina and have too high a melting point, they are difficult to float up in the molten steel; when the content of calcium fed into the refined molten steel after vacuum degassing is too high, since the vapor pressure of calcium is large,secondary oxidation caused by the rising of the surface of molten steel is caused, the stirring intensity is too high, the reaction with steel slag is caused, ca and Mg in slag or refractory materials are transferred into the molten steel, and magnesia-alumina spinel inclusions are formed; meanwhile, excessive calcium reacts with sulfur to generate CaS, which is easy to be enriched in a certain area and affects the performance of the steel ingot. In the invention, the mass fraction of calcium in the finished molten steel is controlled to be 0.0026-0.0045%, so that the calcium content of the fed molten steel is reasonably controlled in practice, and the occurrence of the situation can be effectively avoided.
Drawings
Fig. 1 is a schematic flow chart of a production method of a large carbon-manganese steel tube sheet steel ingot in an embodiment of the invention.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
It should be noted that, without conflict, features in the embodiments of the present invention may be combined with each other. The terms "comprising," "including," "containing," and "having" are intended to be non-limiting, as other steps and other ingredients not affecting the result may be added. The above terms encompass the terms "consisting of … …" and "consisting essentially of … …". Materials, equipment, reagents are commercially available unless otherwise specified.
In the present invention, kg/ton of primary molten steel represents the amount of primary molten steel added per ton.
As shown in fig. 1, the embodiment of the invention provides a method for producing a large carbon-manganese steel tube plate steel ingot, which comprises the following steps:
s1, smelting in an electric furnace to obtain primary molten steel;
s2, adding a slag-forming material and a deoxidizer into the primary steelmaking water for refining to obtain refined molten steel;
s3, carrying out vacuum degassing treatment on the refined molten steel to obtain degassed refined molten steel;
s4, feeding a calcium wire into the degassed refined molten steel, blowing argon for soft blowing, and tapping to obtain finished molten steel, wherein the mass fraction of calcium in the finished molten steel is 0.0026-0.0045%;
s5, vacuum casting is carried out on the finished molten steel to obtain a large carbon-manganese steel tube plate steel ingot; the large carbon-manganese steel tube plate steel ingot comprises the following components in percentage by mass: c:0.16-0.20%, si:0.15-0.60%, mn:1.0 to 1.6 percent, P is less than or equal to 0.030 percent, and S is less than or equal to 0.020 percent.
Compared with the prior art, the invention provides a large carbon-manganese steel tube plate steel ingot and a production method thereof, wherein the method is characterized in that calcium treatment is carried out on refined molten steel by feeding calcium wires with specific weight into the refined molten steel after vacuum degassing, on one hand, the binding capacity of Ca and O is stronger than that of Al, and solid alumina inclusion is modified into liquid calcium aluminate inclusion by feeding the calcium wires, so that the liquid inclusion is not easy to polymerize in the solidification process of the steel ingot; on the other hand, the binding capacity of Ca and S is stronger than that of Mn, tiny high-melting-point CaS is generated in advance in molten steel, the generation of large-size pure MnS in the molten steel solidification process can be inhibited, that is, the MnS is modified into tiny and single CaS phases or (Ca, mn) S compounds are equal, the formation of MnS inclusion with a large length-width ratio in the steel ingot processing deformation process can be avoided, and therefore the defect of flaw detection of large-size carbon manganese steel forgings is reduced.
In addition, when the calcium content fed into refined molten steel after vacuum degassing is too low, high-melting solid inclusions CaO.6Al may be formed in the molten steel 2 O 3 And CaO.2Al 2 O 3 Because these solid inclusions are tougher than alumina and have too high a melting point, they are difficult to float up in the molten steel; when the content of calcium fed into the refined molten steel after vacuum degassing is too high, the vapor pressure of the calcium is large, so that the surface of the molten steel is turned over to cause secondary oxidization, the stirring strength is too high, the reaction with steel slag is caused, and Ca and Mg in slag or refractory materials are transferred into the molten steel to form magnesia-alumina spinel inclusions; meanwhile, excessive calcium reacts with sulfur to generate CaS, which is easy to be enriched in a certain area and affects the performance of the steel ingot. In the present invention, the weight of calcium in the calcium line fed is calculated from O, S and Al content detected in the deaerated refined molten steel. In the present inventionThe calcium content of the molten steel is reasonably controlled by controlling the mass fraction of calcium in the finished molten steel to be 0.0026-0.0045%, so that the occurrence of the situation can be effectively avoided.
In some embodiments of the present invention, in the step S4, the calcium wire is a calcium-iron cored wire, the mass fraction of calcium in the calcium-iron cored wire is 30-50%, and the rest is iron. If the Ca content in the calcium-iron cored wire is more than 50%, the vapor pressure of calcium is higher after the calcium is fed into the molten steel, and the splashing of the molten steel surface is severe, so that the reaction can not be smoothly carried out. If the Ca content in the calcium-iron cored wire is less than 30%, the mass of the calcium wire which needs to be fed is larger, and the yield of calcium is affected.
In some embodiments of the present invention, in the step S4, the temperature of the degassing refined molten steel is 1590 to 1600 ℃ during the feeding of the calcium line to the degassing refined molten steel. In order to make the whole production flow compact and smooth, the molten steel pouring temperature is in the range of 1550-1560 ℃, and the molten steel temperature is reduced to about 5 ℃ in the process of soft blowing for 5-10 min; the average temperature during tapping to pouring molten steel is lowered by 30 ℃, and thus, the temperature of the degassing refined molten steel is 1590-1600 ℃ during feeding of calcium wire to the degassing refined molten steel. In the step S4, when a calcium line is fed to the deaerated refined molten steel, the oxygen content in the deaerated refined molten steel is less than 0.0020%.
In some embodiments of the present invention, in the step S2, the slag forming material includes the following components in mass percent: caO:50-55% of Al 2 O 3 ：30-35％、SiO 2 :2-6% and MgO:4-8%, and the melting temperature of the refining slag formed by the slag forming material is 1300-1400 ℃. The slag-forming material comprises lime and alumina powder, and the addition amount of the slag-forming material is 20-30 kg/ton of primary molten steel. The lime contains MgO.
In some embodiments of the invention, in the step S5, the vacuum casting temperature is 1550-1560 ℃. The melting point of the carbon-manganese steel is about 1510 ℃, and the casting temperature is increased by 40-50 ℃ compared with the melting point of the carbon-manganese steel in consideration of the flowability of molten steel and floating of inclusions; the pouring temperature is too high, the tapping temperature is correspondingly increased, and the refractory material is seriously scoured; the casting temperature is too low, the viscosity of molten steel is high, and the floating of inclusions is not facilitated. During vacuum casting, the casting speed adopts the principle of fast water gap, slow riser and medium speed control of the ingot body. The water gap is filled rapidly according to 7.8t/min, a liquid pool is formed in early casting, and molten steel splashing is prevented; the riser is poured at a low speed of 5.3t/min, and the ingot body is fully fed, so that the improvement of the metallurgical quality of the steel ingot is facilitated; the ingot body is filled at a constant speed of 6.3 t/min.
In view of the fact that calcium is too active, after refining is finished, the modification effect of MnS inclusion is affected by the increase of the O content, and therefore, an asbestos pad is needed to be used for sealing between the tundish edge and the tundish cover, so that the tundish cover and the tundish edge are in close contact, the gap (interval) between the tundish cover and the tundish cover is not more than 20mm, and all holes on the tundish cover should be covered, so that the holes cannot be exposed. If the sealing performance of the tundish is poor, secondary oxidation of molten steel occurs, and the content of CaS in inclusions is obviously reduced, because the content of T.O in the molten steel is increased, and the decomposition of the content of CaS is promoted. At the same time, aluminum in the molten steel reacts with oxygen entering the molten steel in the molten steel oxidation process to generate Al 2 O 3 . The secondary oxidation of molten steel has a remarkable influence on the calcium treatment effect, the CaS originally generated in the steel is decomposed, the secondary oxidation counteracts the effect of the VD calcium wire feeding process, and the inclusions are also in a non-liquid phase region, so that the secondary oxidation of the molten steel in the tundish still needs to be strictly controlled. The tundish cover is roasted by high-temperature molten steel in the production process, slight deformation and warping occur, and the gap (interval) between the tundish cover and the edge of the tundish is not more than 20mm under the actual working condition considered, which is a higher level which can be achieved by production equipment.
In some embodiments of the present invention, in the step S4, the time for soft blowing of argon is 5-10min.
In some embodiments of the invention, in the step S2, the deoxidizer is an aluminum material. The aluminum material is taken as a deoxidizer and added into the primary molten steel in batches in two different forms; after the electric furnace finishes smelting, before molten steel is added into refining, deoxidizing agent is added into the bottom of the refining ladle in the form of aluminum blocks; in the subsequent slagging and refining process, the deoxidizer is added in the form of aluminum powder.
The invention also provides a large carbon-manganese steel tube plate steel ingot, which is manufactured by adopting the production method of the large carbon-manganese steel tube plate steel ingot.
The invention will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. The lime components used in the following examples of the present invention include: caO:90.59%, siO 2 ：2.0％，MgO：3.36％，S：0.02％，P：0.005％。
Example 1
The tonnage of the steel ingot of the smelted large carbon-manganese steel tube plate is 303t, the steel ingot is cast by three bags, the molten steel amount of each bag is 101 tons, and the target content of each element in the steel ingot of the large carbon-manganese steel tube plate is as follows: [C] =0.17%, [ Si ] =0.27%, [ Mn ] =1.25%, [ P ]. Ltoreq.0.004%, [ S ]. Ltoreq.0.002%, and T [ O ]. Ltoreq.15 ppm.
1.1, smelting in an electric furnace to obtain primary molten steel.
1.2, adding 50kg of aluminum blocks into the bottom of a refining ladle before refining the primary molten steel, adding 700kg of lime, 400kg of alumina powder, 50kg of carbon powder and 150kg of aluminum powder while heating up after the primary molten steel is added, adding 800kg of residual slag-making materials of lime and 100kg of alumina powder when the temperature is higher than 1580 ℃, and refining to obtain refined molten steel; during refining, aluminum powder is added in real time to maintain the reducing atmosphere.
1.3, when [ S ] in refined molten steel is less than or equal to 0.002%, the temperature of the refined molten steel reaches 1660 ℃, vacuum degassing is carried out to ensure that the vacuum degree is 100pa, and vacuum is maintained for 15 minutes, thus obtaining the degassed refined molten steel.
1.4, detecting the O content, the S content and the Al content in the deaerated refined molten steel; the actual measurement result is [ O]＝0.0013％，[S]＝0.0017％，[Al]When the temperature of the degassed refined molten steel is 1597 ℃, the operation of feeding the calcium wire is carried out, the feeding length of the calcium wire is 233m, and the feeding time period of the calcium wire is 125 seconds. The calculation basis of the feeding length of the calcium wire is as follows: the calcium content of each meter of calcium line is 0.1kg, the calcium yield under the working condition is about 13 percent, and [ Ca]The target value of the content was 0.003%. Therefore, the length of the calcium line to be fed is {0.003% (target calcium content of molten steel) ×101×10 } 3 (amount of molten steel/kg) }/{0.1 (calcium content/kg per meter). Times.13% (yield of calcium wire)}。
1.5, after the calcium wire feeding operation is completed, carrying out ladle bottom argon soft blowing, wherein the argon pressure is 0.25Mpa, and tapping to a ladle after 8min of soft blowing; the ladle is lifted to a vacuum pouring station, and in view of the fact that the gap between the edge of the tundish with too active calcium and the edge of the tundish cover is sealed by using an asbestos pad, the contact between the edge of the tundish cover and the edge of the tundish cover is required to be tight, the gap (interval) between the edge of the tundish cover and the edge of the tundish cover is 14mm, and all holes on the tundish cover should be covered so as not to be exposed.
1.6, vacuum casting is carried out to obtain a large carbon-manganese steel tube plate steel ingot; during vacuum casting, the temperature of the pouring molten steel of the tundish is measured, the measured value is 1558 ℃, the casting time is 45 minutes, and the average casting speed is 6.73 t/min. 400kg of heating agent and 100kg of heat preservation agent are added into the riser end of the steel ingot after casting. After the steel ingot is insulated in an ingot mould for 56 hours, the steel ingot is removed by using a special hanging clamp, the temperature of the middle part of the steel ingot body is 608 ℃ and the steel ingot is transported to a forging factory for subsequent processing operation, and the EO reactor tube plate forging piece is obtained.
Experimental example
Ultrasonic inspection is carried out on the EO reactor tube sheet forging piece prepared in the embodiment 1, the detection sensitivity phi is 2mm, and the detection conclusion is that: the product meets the NB/T47013.3-2015I grade requirement and is rated as qualified.
In addition, although the present invention is disclosed above, the scope of the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications will fall within the scope of the invention.
Claims (10)
1. The production method of the large carbon-manganese steel tube plate steel ingot is characterized by comprising the following steps of:
s1, smelting in an electric furnace to obtain primary molten steel;
s2, adding a slag-forming material and a deoxidizer into the primary steelmaking water for refining to obtain refined molten steel;
s3, carrying out vacuum degassing treatment on the refined molten steel to obtain degassed refined molten steel;
s4, feeding a calcium wire into the degassed refined molten steel, blowing argon for soft blowing, and tapping to obtain finished molten steel, wherein the mass fraction of calcium in the finished molten steel is 0.0026-0.0045%;
s5, vacuum casting is carried out on the finished molten steel to obtain a large carbon-manganese steel tube plate steel ingot; the large carbon-manganese steel tube plate steel ingot comprises the following components in percentage by mass: c:0.16-0.20%, si:0.15-0.60%, mn:1.0 to 1.6 percent, P is less than or equal to 0.030 percent, and S is less than or equal to 0.020 percent.
2. The method for producing a large carbon-manganese steel tube sheet steel ingot according to claim 1, wherein in the step S4, the calcium wire is a calcium-iron cored wire, and the mass fraction of calcium in the calcium-iron cored wire is 30-50%.
3. The method for producing a large carbon-manganese steel tube sheet ingot according to claim 1, wherein in the step S4, the temperature of the deaerated refined molten steel is 1590 to 1600 ℃ during the feeding of the calcium line to the deaerated refined molten steel.
4. The method for producing a large carbon-manganese steel tube sheet ingot according to claim 1, wherein in step S4, when a calcium line is fed to the deaerated refined molten steel, the oxygen content in the deaerated refined molten steel is less than 0.0020%.
5. The method for producing a large carbon-manganese steel tube sheet steel ingot according to claim 1, wherein in the step S2, the slag forming material comprises the following components in mass percent: caO:50-55% of Al 2 O 3 ：30-35％、SiO 2 :2-6% and MgO:4-8%, and the melting temperature of the refining slag formed by the slag forming material is 1300-1400 ℃.
6. The method for producing a large carbon-manganese steel tube sheet steel ingot according to claim 5, wherein the slag-forming material comprises lime and alumina powder, and the addition amount of the slag-forming material is 20-30 kg/ton of primary molten steel.
7. The method for producing a large carbon-manganese steel tube sheet steel ingot according to claim 1, wherein in the step S5, the vacuum casting temperature is 1550-1560 ℃.
8. The method for producing a large carbon-manganese steel tube sheet steel ingot according to claim 1, wherein in the step S4, the argon soft blowing time is 5 to 10min.
9. The method for producing a large carbon-manganese steel tube sheet steel ingot according to claim 1, wherein in the step S2, the deoxidizer is an aluminum material.
10. A large carbon-manganese steel tube sheet steel ingot, characterized in that it is produced by the production method of a large carbon-manganese steel tube sheet steel ingot according to any one of claims 1 to 9.
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