CN110616360A - Production method of 32Cr3Mo1V continuous casting round billet for roll sleeve - Google Patents
Production method of 32Cr3Mo1V continuous casting round billet for roll sleeve Download PDFInfo
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- CN110616360A CN110616360A CN201910929408.XA CN201910929408A CN110616360A CN 110616360 A CN110616360 A CN 110616360A CN 201910929408 A CN201910929408 A CN 201910929408A CN 110616360 A CN110616360 A CN 110616360A
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 145
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 52
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 58
- 239000010959 steel Substances 0.000 claims abstract description 58
- 238000000034 method Methods 0.000 claims abstract description 52
- 238000005242 forging Methods 0.000 claims abstract description 32
- 238000005266 casting Methods 0.000 claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 25
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000003723 Smelting Methods 0.000 claims abstract description 14
- 239000000498 cooling water Substances 0.000 claims abstract description 14
- 239000012535 impurity Substances 0.000 claims abstract description 12
- 229910052742 iron Inorganic materials 0.000 claims abstract description 10
- 238000004080 punching Methods 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 238000007600 charging Methods 0.000 claims abstract description 7
- 230000001681 protective effect Effects 0.000 claims abstract description 4
- 238000000137 annealing Methods 0.000 claims description 29
- 238000007670 refining Methods 0.000 claims description 14
- 238000009849 vacuum degassing Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 7
- 238000004321 preservation Methods 0.000 claims description 6
- 238000010891 electric arc Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 21
- 239000000126 substance Substances 0.000 abstract description 5
- 238000005204 segregation Methods 0.000 description 22
- 239000013078 crystal Substances 0.000 description 20
- 238000007711 solidification Methods 0.000 description 14
- 230000008023 solidification Effects 0.000 description 14
- 238000009847 ladle furnace Methods 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 238000004512 die casting Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 229910001208 Crucible steel Inorganic materials 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 241000519995 Stachys sylvatica Species 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention relates to the technical field of continuous casting large round billet production, and particularly discloses a method for producing a 32Cr3Mo1V continuous casting large round billet for a roll sleeve. Mainly solves the technical problems that the continuous casting large round billet in the prior art, especially the large section has larger central defect and can not be used for producing the main raw billet of the 32Cr3Mo1V roller sleeve. The invention relates to a method for producing a 32Cr3Mo1V continuous casting round billet for a roll sleeve, which comprises the following steps: smelting molten steel, wherein the molten steel smelting adopts molten iron with low impurity element content, and the impurity element content is as follows: pb is less than or equal to 0.002 percent, As is less than or equal to 0.01 percent, Sn is less than or equal to 0.002 percent, Sb is less than or equal to 0.003 percent, and Bi is less than or equal to 0.002 percent; continuous casting, wherein the whole continuous casting process adopts protective casting and constant-pulling-speed production, a crystallizer, a casting flow and tail end electromagnetic stirring are used, and weak secondary cooling water is matched; heating and forging, adopting low-temperature furnace charging, heating, upsetting, punching, drawing out and reaming, wherein the chemical components of the produced continuous casting round billet are qualified, the macroscopic quality and the central quality meet the requirements of forging the roller sleeve, and the continuous casting round billet can be used for replacing steel ingots to produce 32Cr3Mo1V roller sleeves and has better development prospect.
Description
Technical Field
The invention relates to the technical field of continuous casting large round billet production, in particular to a method for producing a 32Cr3Mo1V continuous casting large round billet for a roller sleeve.
Background
32Cr3Mo1V is a major material for roller covers in the industrial field of aluminum strip rolling because of its high thermal fatigue resistance, good thermal conductivity and excellent mechanical properties.
At present, the main raw blank for producing the 32Cr3Mo1V roller sleeve is a die-cast steel ingot, and a continuous casting large round billet is not used, because the center quality of the steel ingot is superior to that of the continuous casting large round billet, and the steel ingot is forged and subjected to subsequent heat treatment to obtain a roller sleeve product meeting the performance requirements. However, compared with the continuous casting large round billet, the yield of the die-cast steel ingot is lower than that of the continuous casting large round billet, a roller sleeve with the same size is forged, the yield of the steel ingot is only 81.5%, the yield of the continuous casting large round billet is about 92.7%, the molten steel yield of the die-cast steel ingot is lower than that of the continuous casting large round billet, the automation degree of die casting production is far lower than that of the continuous casting production, the energy consumption in the die casting production process is higher than that of the continuous casting, the die casting production cost is higher, specifically, the continuous casting is more than 3 furnaces, and the die casting production cost is about 150 yuan/t higher than that of the continuous casting.
Because the casting mode and the solidification principle of continuous casting and die casting are different, the continuous casting large round billet, especially the large section has the characteristics of large central defect and the like, and can not be used for producing the main raw billet of the 32Cr3Mo1V roller sleeve, therefore, the reasonable continuous casting process is adopted, the internal quality of the continuous casting billet is improved, and the 32Cr3Mo1V roller sleeve produced by using the continuous casting large round billet instead of a steel ingot has better development prospect.
Disclosure of Invention
The invention aims to provide a method for producing a 32Cr3Mo1V continuous casting large round billet for a roller sleeve, which aims to overcome the technical problems that the continuous casting large round billet, particularly a large section has large central defect and cannot be used for producing a main raw billet of the 32Cr3Mo1V roller sleeve, so as to improve the internal quality of a continuous casting billet and further produce the continuous casting large round billet capable of replacing a steel ingot to forge the 32Cr3Mo1V roller sleeve.
In order to achieve one of the purposes, the invention adopts the following technical scheme:
a method for producing a 32Cr3Mo1V continuous casting round billet for a roll sleeve, which comprises the following steps:
smelting molten steel, wherein the molten steel smelting adopts molten iron with low impurity element content, and the impurity element content is as follows: pb is less than or equal to 0.002 percent, As is less than or equal to 0.01 percent, Sn is less than or equal to 0.002 percent, Sb is less than or equal to 0.003 percent, and Bi is less than or equal to 0.002 percent;
continuous casting, wherein the whole continuous casting process adopts protective casting and constant-pulling-speed production, a crystallizer, a casting flow and tail end electromagnetic stirring are used, and weak secondary cooling water is matched, wherein the specific water amount of the secondary cooling water is controlled within the range of 0.07-0.10L/kg;
heating, forging, charging at low temperature, heating, upsetting, punching, drawing out and reaming.
By adopting the technical means, the production method of the 32Cr3Mo1V continuous casting round billet for the roller sleeve is carried out by an electric furnace → LF refining → VD vacuum degassing → Phi 700mm continuous casting → annealing, so that the production automation degree is increased, the energy consumption is low, and the production cost is effectively reduced; the continuous casting adopts constant drawing speed, controls the superheat degree to be stable, adopts a crystallizer, a casting flow and tail end electromagnetic stirring, protects the casting in the whole process, produces 32Cr3Mo1V continuous casting round billets, has no riser or nozzle, reduces the procedures of forging and cutting the riser or nozzle, improves the internal quality of the continuous casting billets, reduces the component segregation of molten steel in the solidification process, reduces the central cracks and shrinkage cavities of the continuous casting billets, meets the requirements of forging roller sleeves on low-power quality and central quality, produces the continuous casting round billets by replacing the continuous casting round billets produced by the process of the invention to produce 32Cr3Mo1V roller sleeves, has basically consistent segregation in the length direction, avoids the serious defects caused by A-type segregation which is segregated upwards in the longitudinal direction and V-type segregation which is downwards in the longitudinal direction, and prolongs the service life of the roller sleeves.
According to one embodiment of the invention, in the molten steel smelting process: and sequentially carrying out electric arc furnace smelting, LF refining and VD vacuum degassing treatment on the molten iron. By adopting the technical means, harmful elements in the molten iron are controlled, the 32Cr3Mo1V steel with low gas content, low P content and low S content is produced, and the chemical components of the molten steel meet the standard requirements.
According to an embodiment of the invention, wherein during the continuous casting: placing the 32Cr3Mo1V continuous casting billet into a hot charging trolley furnace for annealing at the temperature of more than or equal to 550 ℃.
According to one embodiment of the invention, wherein the 32Cr3Mo1V continuous casting gauge is a Φ 700mm gauge.
According to an embodiment of the invention, the annealing temperature of the annealing process is 850-900 ℃. By adopting the technical means, the annealing temperature is set to 850-900 ℃, so that resources can be saved, and cracks generated during heating forging due to large central defects of continuous casting billets are prevented. If the annealing temperature is more than 900 ℃, although the central crack and crack of the continuous casting billet can be prevented, the temperature is higher, so more energy is needed, and the resource waste is serious. However, if the annealing temperature is controlled to be lower than 550 ℃, for example, the annealing temperature of 450 ℃ or 400 ℃, the produced continuous casting slab has more cracks therein, has lower quality and can not meet the requirements, and is not suitable for replacing steel ingots to produce 32Cr3Mo1V roller sleeves. Therefore, in the production process, the annealing temperature is controlled to be 850-900 ℃, so that the cracking of the continuous casting billet can be prevented, and the energy can be saved.
According to an embodiment of the invention, the annealing temperature is kept for more than or equal to 24 hours in the casting process. By adopting the technical means, the annealing temperature heat preservation time is more than or equal to 24 hours, so that enough heat preservation time is provided for molten steel, and cracks are prevented from being generated during heating forging due to large central defects of continuous casting billets.
According to an embodiment of the invention, wherein during the continuous casting: in the constant-pulling-speed production process, the superheat degree is controlled to be stable at 18-30 ℃. By adopting the technical means, the superheat degree is controlled to be stable at 18-30 ℃.
According to an embodiment of the invention, wherein the degree of superheat is further controlled to be stable between 20-25 ℃. The continuous casting superheat degree is one of key process parameters for ensuring the continuous casting yield and the casting blank quality, if the continuous casting molten steel superheat degree is too small in the production process, for example, the superheat degree is less than 15 ℃, the molten steel is easily polluted by impurities, a water gap is easily blocked and even frozen, and if the continuous casting molten steel superheat degree is too large, the central segregation of the casting blank is aggravated, and a leakage accident is even induced, or cracks occur due to the fact that a formed blank shell is thin, and columnar crystals are developed. The superheat degree of continuous casting molten steel directly influences the solidification condition of the molten steel, and further influences the surface quality of a solidified casting blank, the growth uniformity of a primary blank shell and the internal strength of the casting blank. By adopting the technical means, the superheat degree is further controlled to be stabilized between 20 and 25 ℃, so that the columnar crystal area of continuous casting is reduced, the equiaxed crystal area is enlarged, the development of columnar crystals of continuous casting is prevented, the component segregation of molten steel in the solidification process is reduced, and the internal defects of central cracks, shrinkage cavities and the like of continuous casting billets are reduced.
According to an embodiment of the invention, wherein during the continuous casting: and after the casting is finished, cooling the continuous casting round billet to below 150 ℃ along with the furnace, discharging, and entering the next step. By adopting the technical means, 80-90% of residual stress can be eliminated, the continuous casting billet has low-power quality, the center porosity is less than or equal to 1.5, the shrinkage cavity is less than or equal to 1.5, the center crack is less than or equal to 1.0, and the defects of intermediate cracks, white spots, bubbles and peeling are avoided, and the inspection and the rating are met according to a rating diagram A in the annex A of the YB/T4149 standard.
According to an embodiment of the invention, during the heating and forging process, the temperature of the heating and forging environment is less than or equal to 450 ℃. The heating and forging environmental temperature is less than or equal to 450 ℃, if the environmental temperature is more than 450 ℃ or more than 500 ℃, more energy is needed to provide the high temperature, the resource waste can be caused, the central defect of the continuous casting billet is eliminated by adopting the technical means, the forged continuous casting billet is shrunk and loosened, the product is compact, and the post-forging heat treatment process meets the flaw detection standard: JB/T5000.15-2008 II level requirement.
According to one embodiment of the invention, the punching operation is numerical control lathe punching, and the hole expanding operation is numerical control lathe punching.
The performance of the 32Cr3Mo1V continuous casting round billet for the roller sleeve finally obtained by adopting the technical means of the invention application is as follows:
(test sample specification: 10X50mmKV2, test temperature 20 ℃ C.)
The tensile strength is more than or equal to 1350 Rm/Mpa;
the specified plastic elongation strength is more than or equal to 1200 Rp0.2/Mpa;
the elongation after fracture is more than or equal to 15 percent;
the reduction of area is more than or equal to 50 percent;
the absorption energy (impact energy) is more than or equal to 30(10 multiplied by 50mmKV 2)/J.
(the impact has U-shaped notch and V-shaped notch, wherein, the test data is that the model specification is 10 multiplied by 50mmKV2 when the absorbed energy (impact energy) is more than or equal to 30/J, and the V-shaped notch.)
Test items and their corresponding standards:
the 132Cr3Mo1V steel comprises the following chemical components in percentage by weight:
C：0.33～0.36％，Mn：0.20～0.50％，Si：0.20～0.40％，Cr：3.00～3.20％，Ni：0.30～0.45％， Mo：1.00～1.20％，V：0.19～0.22％，P≤0.008％，S≤0.005％，Cu≤0.10％，Al≤0.01％，[H] ≤0.00013％，[O]≤0.0025％，[N]≤0.0075％；
2, low-power quality detection standard of continuous casting billets: rating of appendix A of the YB/T4149 standard;
3, flaw detection standard of the heat treatment process after forging: JB/T5000.15-2008.
Has the advantages that:
according to the production method of the 32Cr3Mo1V continuous casting round billet for the roller sleeve, the production automation degree is increased, the energy consumption is low, and the production cost is effectively reduced through the electric furnace → LF refining → VD vacuum degassing → Phi 700mm continuous casting → annealing; the continuous casting adopts constant drawing speed, controls the superheat degree to be stable, adopts a crystallizer, a casting flow and tail end electromagnetic stirring, protects the casting in the whole process, produces 32Cr3Mo1V continuous casting round billets, has no riser or nozzle, reduces the working procedures of forging and cutting the riser or nozzle, improves the internal quality of the continuous casting billets, reduces the component segregation of molten steel in the solidification process, reduces the central cracks and shrinkage cavities of the continuous casting billets, meets the requirements of forging roller sleeves on low-power quality and central quality, produces the 32Cr3Mo1V roller sleeves by replacing steel ingots with the continuous casting round billets produced by the process, basically has consistent segregation in the length direction, avoids serious defects caused by A-type segregation of longitudinal upward segregation and V-type segregation of longitudinal downward segregation, and prolongs the service life of the roller sleeves.
Detailed Description
In order to make the objects and technical solutions of the present invention clear and fully described, and advantages thereof more clear, embodiments of the present invention are described in further detail below. It is to be understood that the specific embodiments described herein are illustrative of some, but not all embodiments of the invention, and are intended to be exemplary only, and not limiting of the invention, and that all other embodiments obtained by those skilled in the art without making any inventive step are within the scope of the invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal", and the like indicate orientations or positional relationships only for the convenience of description and simplification of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
For the purposes of simplicity and explanation, the principles of the embodiments are described by referring mainly to examples. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. It will be apparent, however, to one skilled in the art that the embodiments may be practiced without these specific details. In some instances, well-known methods and structures have not been described in detail so as not to unnecessarily obscure the embodiments. In addition, all embodiments may be used in combination with each other.
The first embodiment is as follows:
a method for producing a 32Cr3Mo1V continuous casting round billet for a roll sleeve, which comprises the following steps:
smelting molten steel, wherein the molten steel smelting adopts molten iron with low impurity element content, and the impurity element content is as follows: pb is less than or equal to 0.002%, As is less than or equal to 0.01%, Sn is less than or equal to 0.002%, Sb is less than or equal to 0.003%, and Bi is less than or equal to 0.002%, and the molten iron is subjected to electric arc furnace smelting, LF refining and VD vacuum degassing treatment in sequence.
LF refining, i.e. ladle refining, and LF furnace (LADLEFURNACE), i.e. ladle refining furnace, are main external refining equipment in steel production. LF furnaces are generally referred to as refining furnaces in the steel industry, and are actually a special form of electric arc furnaces.
VD (VacuumDegassing) vacuum refining furnace: the method is a ladle vacuum degassing process, which is between a Ladle Furnace (LF) and a wire Feeding (FW) and is used for preparing molten steel for a continuous casting machine, and the main process is as follows: argon is introduced into the ladle, hydrogen and nitrogen are mainly removed, floating of slag inclusion is promoted, the process is simple, generally, after the LF furnace process, vacuumizing is mainly performed, argon is blown at the bottom for stirring, and then vacuum refining is performed.
Molten steel smelting adopts molten iron with low impurity element content, and the impurity element content is as follows: pb is less than or equal to 0.002 percent, As is less than or equal to 0.01 percent, Sn is less than or equal to 0.002 percent, Sb is less than or equal to 0.003 percent, and Bi is less than or equal to 0.002 percent, harmful elements in molten iron are controlled, 32Cr3Mo1V steel with low gas content, low P and low S is produced, and the chemical components of the molten steel meet the standard requirements.
The standard requirements according to the invention are that (the weight percentage of the chemical components of the 32Cr3Mo1V steel is that C: 0.33 to 0.36%, Mn: 0.20 to 0.50%, Si: 0.20-0.40%, Cr: 3.00-3.20%, Ni: 0.30-0.45%, Mo: 1.00-1.20%, V: 0.19 to 0.22 percent, less than or equal to 0.008 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.10 percent of Cu, less than or equal to 0.01 percent of Al, less than or equal to 0.00013 percent of H, less than or equal to 0.0025 percent of O, and less than or equal to 0.0075 percent of N. The production process of furnace → LF refining → VD vacuum degassing → Phi 700mm continuous casting → annealing is adopted, so that the production automation degree is increased, the energy consumption is low, and the production cost is effectively reduced.
And continuous casting, wherein protective casting and constant-pulling-speed production are adopted in the whole continuous casting process, the superheat degree is controlled to be stabilized between 18 and 30 ℃, the superheat degree is further controlled to be stabilized between 20 and 25 ℃, a crystallizer, a casting flow and tail end electromagnetic stirring are used, weak secondary cooling water is matched, and the specific water amount of the secondary cooling water is specifically controlled to be 0.07 to 0.10L/kg. The "specific water amount" is the amount of cooling water used per unit weight of molten steel, and is expressed in L/kg, and the amount of cooling water per cooling zone can be calculated by determining the ratio of cooling water distribution in each zone of the secondary cooling and then knowing the rate of casting. By adopting the technical means, in the continuous casting process, the higher the surface temperature of the casting blank is, the columnar crystals on the crystal structure are inhibited, the isogenic area ratio is relatively improved, the columnar crystal area of the continuous casting is reduced, the equiaxial crystal area is increased, the columnar crystals are prevented from being developed, the equiaxial crystal area ratio on the cross section can be increased, the cooling strength can also be reduced, the component segregation of molten steel in the solidification process is reduced, and the internal defects of central cracks, shrinkage cavities and the like of the continuous casting blank are reduced. In order to prevent cracks from being generated during heating forging due to large central defects of the continuous casting billet.
In the method for producing the 32Cr3Mo1V continuous casting large round billet, the superheat degree is controlled to be stabilized between 18 and 30 ℃ and between 18 and 30 ℃ in the continuous casting process, the superheat degree is optimally controlled to be stabilized between 20 and 25 ℃, the optimum superheat temperature is the preferred superheat temperature of the method, the continuous casting superheat degree is one of key process parameters for ensuring the continuous casting yield and the casting billet quality, if the superheat degree of continuous casting molten steel is too small in the production process, for example, the superheat degree is less than 15 ℃, molten steel is easy to be polluted by impurities, a water gap is easy to block or even freeze, and if the superheat degree of the continuous casting molten steel is too large, the central segregation of the casting billet is aggravated, and a leakage accident is even induced, or a formed billet shell is thinner, so that cracks occur, and columnar crystals are developed. The superheat degree of continuous casting molten steel directly influences the solidification condition of the molten steel, and further influences the surface quality of a solidified casting blank, the growth uniformity of a primary blank shell and the internal strength of the casting blank. Therefore, the superheat degree in the continuous casting process of the molten steel is controlled to be stabilized between 18 and 30 ℃, and the superheat degree is optimally controlled to be stabilized between 20 and 25 ℃, so that the columnar crystal area of the produced continuous casting billet is reduced, the equiaxial crystal area is enlarged, the development of columnar crystals is prevented, the component segregation of the molten steel in the solidification process is reduced, the internal defects such as central cracks and shrinkage cavities of the continuous casting billet are reduced, and the defect that cracks are generated in the heating forging process due to the large central defect of the continuous casting billet is overcome.
The specific water amount is 1.0-1.2L/kg of strong secondary cooling water which is generally used for conventional low-carbon steel, namely, strong cooling is adopted to increase the cooling solidification coefficient and shorten the solidification time, under the same metallurgical length, the drawing speed can be improved, the productivity can be improved, but if stronger secondary cooling water with the specific water quantity of 1.0-1.2L/kg or secondary cooling water with the specific water quantity larger than that of the weak secondary cooling water adopted by the invention is adopted and applied to the production process of the invention, the center quality of the produced continuous casting billet does not meet the requirement, the cast columnar crystal area is large, the equiaxed crystal area is small, columnar crystals are developed, component segregation of molten steel in the solidification process is serious, so that more cracks exist in the molten steel, more internal defects such as continuous casting billet center cracks and shrinkage cavities exist, and the continuous casting billet is not suitable for replacing steel ingots to produce 32Cr3Mo1V roller sleeves. The steel adopted by the invention is a 32Cr3Mo1V continuous casting billet which is suitable for a 32Cr3Mo1V roller sleeve and has the specification of phi 700mm, the quality requirement of the continuous casting billet is higher, and because the crack sensitivity is stronger, weak secondary cooling water with the specific water amount controlled within the range of 0.07-0.10L/kg is required to be adopted, so that the columnar crystal area of continuous casting is reduced, the equiaxed crystal area is enlarged, the columnar crystal is prevented from developing, the component segregation of molten steel in the solidification process is reduced, and the internal defects of central cracks, shrinkage cavities and the like of the continuous casting billet are reduced.
Carrying out hot charging trolley furnace annealing on a 32Cr3Mo1V continuous casting billet with the phi of 700mm specification at the high temperature of more than or equal to 550 ℃, wherein the preferred annealing temperature is 850-900 ℃, and the annealing temperature of 850-900 ℃ is adopted, so that the resources can be saved, and the generation of cracks can be prevented; the annealing temperature is 850-900 ℃, the heat preservation time is more than or equal to 24 hours, the continuous casting billet is discharged after being cooled to the temperature below 150 ℃ along with the furnace, and the heat preservation time of the 32Cr3Mo1V continuous casting billet at the annealing temperature of 850-900 ℃ is more than or equal to 24 hours, so that the continuous casting billet is subjected to sufficient heat preservation annealing, the phenomenon that cracks are generated during heating forging due to large central defects of the continuous casting billet is avoided, and 80% -90% of residual stress can be eliminated; the continuous casting billet obtained in the annealing environment has low group quality, the center porosity is less than or equal to 1.5, the shrinkage cavity is less than or equal to 1.5, the center crack is less than or equal to 1.0, and the defects of intermediate cracks, white spots, bubbles and peeling are avoided, and the continuous casting billet is inspected and rated according to a rating diagram A in the YB/T4149 standard appendix.
If the annealing temperature is more than 900 ℃, although the central crack and crack of the continuous casting billet can be prevented, the temperature is higher, so more energy is needed, and the resource waste is serious. However, if the annealing temperature is controlled to be lower than 550 ℃, for example, the annealing temperature of 450 ℃ or 400 ℃, the produced continuous casting slab has more cracks therein, has lower quality and can not meet the requirements, and is not suitable for replacing steel ingots to produce 32Cr3Mo1V roller sleeves. Therefore, in the production process, the annealing temperature is controlled to be 850-900 ℃, so that the cracking of the continuous casting billet can be prevented, and the energy can be saved.
The continuous casting adopts constant drawing speed, controls the superheat degree to be stable, adopts a crystallizer, casting flow and tail end electromagnetic stirring, protects the casting in the whole process, produces 32Cr3Mo1V continuous casting round billets, has no riser or nozzle, reduces the processes of cutting the riser and the nozzle by forging, improves the internal quality of the continuous casting billet, lightens the component segregation of molten steel in the solidification process, reduces the central cracks and shrinkage cavities of the continuous casting billet, meets the requirements of forging a roller sleeve by low-power quality and central quality, improves the yield by replacing a steel ingot forging roller sleeve and ensures that the yield of the continuous casting round billets is about 92.7 percent.
Heating and forging, wherein in the heating and forging processes, the ambient temperature of the heating and forging is less than or equal to 450 ℃, low-temperature furnace charging, heating, upsetting, punching, drawing and chambering are adopted, the punching operation adopts a numerical control lathe to punch holes, and the chambering operation adopts a numerical control lathe to punch holes. The heating and forging environmental temperature is less than or equal to 450 ℃, if the environmental temperature is more than 450 ℃ or more than 500 ℃, more energy is needed to provide the high temperature, the resource waste can be caused, the central defect of the continuous casting billet is eliminated by adopting the technical means, the forged continuous casting billet is shrunk and loosened, the product is compact, and the post-forging heat treatment process meets the flaw detection standard: JB/T5000.15-2008 II level requirement.
The performance of the 32Cr3Mo1V continuous casting round billet for the roller sleeve finally obtained by adopting the technical means in the embodiment of the invention is as follows:
(test sample specification: 10X50mmKV2, test temperature 20 ℃ C.)
The tensile strength is more than or equal to 1350 Rm/Mpa;
the specified plastic elongation strength is more than or equal to 1200 Rp0.2/Mpa;
the elongation after fracture is more than or equal to 15 percent;
the reduction of area is more than or equal to 50 percent;
the absorption energy (impact energy) is more than or equal to 30(10 multiplied by 50mmKV 2)/J.
(the impact has U-shaped notch and V-shaped notch, wherein, the test data is that the model specification is 10 multiplied by 50mmKV2 when the absorbed energy (impact energy) is more than or equal to 30/J, and the V-shaped notch.)
According to the method for producing the 32Cr3Mo1V continuous casting round billet for the roll sleeve, disclosed by the invention, the production automation degree is increased, the energy consumption is low, and the production cost is effectively reduced through the electric furnace → LF refining → VD vacuum degassing → Phi 700mm continuous casting → annealing; the continuous casting adopts constant drawing speed, controls the superheat degree to be stable, adopts a crystallizer, casting flow and tail end electromagnetic stirring, protects the casting in the whole process, produces 32Cr3Mo1V continuous casting round billets, has no dead head and water gap, reduces the working procedures of forging and cutting off the dead head and the water gap, reduces one fire for forging, saves energy, reduces the labor intensity of a forging worker, and improves the production efficiency; the internal quality of the continuous casting blank is improved, the component segregation of molten steel in the solidification process is reduced, the central cracks and shrinkage cavities of the continuous casting blank are reduced, and the low-power quality and the central quality of the continuous casting blank meet the requirements of forging a roller sleeve; the continuous casting round billet produced by the process of the invention replaces a steel ingot to produce the 32Cr3Mo1V roller sleeve, the segregation in the length direction is basically consistent, the serious defects caused by the A-type segregation segregated longitudinally upwards and the V-type segregation segregated longitudinally downwards are avoided, and the service life of the roller sleeve is prolonged. The technical problem in the prior art is overcome, and the continuous casting large round billet capable of replacing the traditional steel ingot to forge a 32Cr3Mo1V roller sleeve is produced.
Although the illustrative embodiments of the present invention have been described above to enable those skilled in the art to understand the present invention, the present invention is not limited to the scope of the embodiments, and it is apparent to those skilled in the art that all the inventions utilizing the inventive concept are protected as long as they can be changed within the spirit and scope of the present invention as defined and defined by the appended claims.
Claims (11)
1. A method for producing a 32Cr3Mo1V continuous casting round billet for a roll sleeve, which comprises the following steps:
smelting molten steel, wherein the molten steel smelting adopts molten iron with low impurity element content, and the impurity element content is as follows: pb is less than or equal to 0.002 percent, As is less than or equal to 0.01 percent, Sn is less than or equal to 0.002 percent, Sb is less than or equal to 0.003 percent, and Bi is less than or equal to 0.002 percent;
continuous casting, wherein the whole process of the continuous casting adopts protective casting, the continuous casting adopts constant drawing speed production, a crystallizer, a casting flow and tail end electromagnetic stirring are used, and weak secondary cooling water is matched;
heating, forging, charging at low temperature, heating, upsetting, punching, drawing out and reaming.
2. The method for producing the continuous casting round billet for the roll sleeve of 32Cr3Mo1V as claimed in claim 1, wherein in the molten steel smelting process:
and sequentially carrying out electric arc furnace smelting, LF refining and VD vacuum degassing treatment on the molten iron.
3. The method for producing a continuous casting large round billet for a roll sleeve 32Cr3Mo1V as claimed in claim 1, wherein in the continuous casting process:
placing the 32Cr3Mo1V continuous casting billet into a hot charging trolley furnace for annealing at the high temperature of more than or equal to 550 ℃.
4. The method for producing a continuous casting round billet for a roll sleeve of 32Cr3Mo1V as claimed in claim 3, wherein the continuous casting specification of 32Cr3Mo1V is a Φ 700mm specification.
5. The method for producing a continuous casting large round billet for a roll sleeve 32Cr3Mo1V as claimed in claim 3, wherein in the continuous casting process:
the annealing temperature in the annealing process is 850-900 ℃.
6. The method for producing a continuous cast round billet for a roll shell of 32Cr3Mo1V according to claim 5, wherein,
in the casting process, the annealing temperature and the heat preservation time are more than or equal to 24 hours.
7. The method for producing a continuous casting large round billet for a roll sleeve 32Cr3Mo1V as claimed in claim 1, wherein in the continuous casting process:
in the constant-pulling-speed production process, the superheat degree is controlled to be stabilized between 18 and 30 ℃.
8. The method for producing a continuous cast round billet for a roll shell of 32Cr3Mo1V according to claim 7, wherein,
further controlling the superheat degree to be stable between 20 and 25 ℃.
9. The method for producing a continuous casting large round billet for a roll sleeve 32Cr3Mo1V as claimed in claim 1, wherein in the continuous casting process:
and after the casting is finished, cooling the continuous casting large round billet to below 150 ℃ along with the furnace, discharging, and entering the next step.
10. The method for producing a continuous cast round billet for a roll sleeve of 32Cr3Mo1V as claimed in claim 1,
in the heating and forging process, the heating and forging environment temperature is less than or equal to 450 ℃.
11. The method for producing the continuous casting round billet for the roll sleeve of 32Cr3Mo1V as claimed in claim 1, wherein the punching operation is performed by a numerical control lathe, and the hole expanding operation is performed by a numerical control lathe.
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| CN113699337A (en) * | 2021-08-06 | 2021-11-26 | 山西太钢不锈钢股份有限公司 | Heat treatment process for continuous casting large round billet of 9Cr heat-resistant steel |
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Application publication date: 20191227 |