CN113664462A - Short-process preparation method of stainless steel coated carbon steel composite plate - Google Patents
Short-process preparation method of stainless steel coated carbon steel composite plate Download PDFInfo
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- CN113664462A CN113664462A CN202110845241.6A CN202110845241A CN113664462A CN 113664462 A CN113664462 A CN 113664462A CN 202110845241 A CN202110845241 A CN 202110845241A CN 113664462 A CN113664462 A CN 113664462A
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Abstract
The invention discloses a short-process preparation method of a stainless steel coated carbon steel composite plate, and belongs to the technical field of preparation of stainless steel coated carbon steel composite plates. The method comprises the steps of preparing a 304 stainless steel clad Q235 carbon steel composite plate blank with a strong metallurgical bonding interface by cooperatively controlling the surface temperature to be compounded of 304 stainless steel liquid and a Q235 carbon steel core plate before solid-liquid compounding and combining temperature control and cooling, heating at 1000-1200 ℃ for 30-120 minutes, carrying out hot rolling compounding with the total deformation of 30-50% and the rolling pass of 2-5 times, and carrying out cold rolling with the single-pass deformation of 10-20% and the rolling pass of 2-5 times. Compared with the traditional preparation method of the 304 stainless steel clad Q235 carbon steel composite plate, the preparation method has the advantages of short process flow, high efficiency and low cost, and the interface bonding strength of the prepared 304 stainless steel clad Q235 carbon steel composite plate is high.
Description
Technical Field
The invention belongs to the technical field of preparation of stainless steel coated carbon steel composite plates, and particularly relates to a short-process preparation method of a stainless steel coated carbon steel composite plate.
Background
The 304 stainless steel clad Q235 carbon steel composite board is a metal layered composite material formed by compounding a Q235 carbon steel core board and a 304 stainless steel cladding layer through a certain preparation method, has the characteristics of corrosion resistance, heat resistance, wear resistance, attractive appearance and the like of the 304 stainless steel, has the advantages of high strength and toughness, impact resistance, low cost and the like of the Q235 carbon steel, and is widely applied to the fields of nuclear industry, shipbuilding, petrifaction, armor, seawater desalination and the like.
The vacuum hot rolling compounding method is the most common method for producing 304 stainless steel coated Q235 carbon steel composite plates in large scale at home and abroad at present, and the basic process flow is as follows: treating the surface to be compounded → laminating and assembling → welding around → vacuumizing → heating → hot rolling → cooling → separating → straightening → heat treatment. In order to obtain the 304 stainless steel clad Q235 carbon steel composite plate with strong interface combination, surface treatment to be combined, assembly by superposition, peripheral welding and vacuumizing are required to be carried out before hot rolling, the heating temperature is high (1100-1300 ℃), the heating time is long (2-10 hours), the hot rolling reduction is large (50-90%), and the hot rolling passes are multiple (10-20); moreover, the composite interface is oxidized and seriously deformed in an uncoordinated way under high temperature, and the interface has the defects of oxide, holes, stress concentration and the like, so that the production process of the 304 stainless steel coated Q235 carbon steel composite plate has long flow, low efficiency, high cost and low interface bonding strength. For the 304 stainless steel clad Q235 carbon steel composite sheet with high surface quality requirement, the 304 stainless steel clad Q235 carbon steel composite plate after hot rolling compounding needs to be further cold rolled and formed, because the interface of the 304 stainless steel clad Q235 carbon steel composite plate prepared by the vacuum hot rolling compounding method has the defects of oxides, holes, stress concentration and the like, the interface bonding strength is low, and in order to avoid interface cracking during subsequent cold rolling, the deformation amount of cold rolling passes is small (generally less than 10%), the number of rolling passes is large, and the production process has long flow, low efficiency and high cost.
In conclusion, because the traditional preparation process of the 304 stainless steel coated Q235 carbon steel composite plate has the problems of long flow, low efficiency, high cost, low interface bonding strength and the like, a new short-flow preparation method needs to be developed.
Disclosure of Invention
The invention provides a short-process preparation method of a 304 stainless steel clad Q235 carbon steel composite plate, which is used for efficiently producing a high-performance 304 stainless steel clad Q235 carbon steel composite plate, reducing the production cost and improving the interface bonding strength, and is characterized in that the temperature of the surfaces to be compounded of 304 stainless steel liquid and a Q235 carbon steel core plate before compounding is cooperatively controlled, the temperature is controlled and cooled after compounding, the 304 stainless steel clad Q235 carbon steel composite plate blank with a strong metallurgical bonding interface is prepared, and then small-deformation hot rolling or single-pass large-deformation cold rolling forming is carried out after small-deformation hot rolling, so that the production process flow of the conventional 304 stainless steel clad Q235 carbon steel composite plate is shortened, the production efficiency is improved, the production cost is reduced, and the interface bonding strength of the 304 stainless steel clad Q235 carbon steel composite plate is improved.
The short-process preparation method of the stainless steel coated carbon steel composite plate comprises the following specific steps:
step 1: preserving heat of 304 stainless steel liquid in a smelting furnace at 1450-1700 ℃ for 30-120 minutes, and introducing inert gas into the smelting furnace for protection; mechanically polishing the surface to be compounded of a Q235 carbon steel core plate with the thickness of 3-100 mm, and then heating the surface to be compounded of the Q235 carbon steel core plate by using a heating device for 0.01-10 minutes to ensure that the temperature of the surface to be compounded of the Q235 carbon steel core plate reaches 100-700 ℃; after the surface to be compounded of the Q235 carbon steel core plate is heated to a set temperature, rapidly pouring 304 stainless steel liquid on the surface to be compounded of the Q235 carbon steel core plate, and solidifying to obtain a 304 stainless steel Q235 carbon steel pre-compounded plate blank; and (3) controlling the 304 stainless steel coated Q235 carbon steel pre-composite plate blank to cool at a cooling speed of 1-100 ℃/s through a cooling device, and obtaining the 304 stainless steel coated Q235 carbon steel composite plate blank with a strong metallurgical bonding interface and a coating thickness of 1-20 mm.
Step 2: heating the 304 stainless steel coated Q235 carbon steel composite plate blank at 1000-1200 ℃ for 30-120 minutes, then carrying out hot rolling with the total deformation of 30-50%, the single-pass deformation of 15-25% and the rolling pass of 2-5, and forming to obtain the 304 stainless steel coated Q235 carbon steel composite plate with the total thickness of 2-60 mm, the base layer thickness of 1.5-50 mm and the coating thickness of 0.5-10 mm.
Further, cold rolling is carried out on the 304 stainless steel coated Q235 carbon steel composite plate with the total deformation of 30% -60%, the single-pass deformation of 10% -20% and the rolling pass of 2-5, and the 304 stainless steel coated Q235 carbon steel composite plate with the total thickness of 0.8-6 mm, the base layer thickness of 0.6-5 mm and the coating thickness of 0.2-1 mm is prepared.
Further, the 304 stainless steel clad Q235 carbon steel composite plate was subjected to a straightening treatment, followed by a heat treatment.
The invention has the advantages that:
1. by cooperatively controlling the temperature of the surface to be compounded of the 304 stainless steel liquid and the Q235 carbon steel core plate before solid-liquid compounding and combining temperature control cooling after compounding, the mutual diffusion of chromium, nickel and iron atoms at two sides of a compound interface is promoted, the diffusion of carbon atoms is inhibited, the formation of interface oxides, holes and brittle phases is avoided, a 304 stainless steel clad Q235 carbon steel compound plate blank with a strong metallurgical bonding interface is obtained, and the procedures of laminating assembly, peripheral welding, vacuumizing and the like before traditional hot rolling compounding are cancelled.
2. Compared with the traditional hot rolling compounding method of the 304 stainless steel clad Q235 carbon steel composite plate, the preparation method of the 304 stainless steel clad Q235 carbon steel composite plate provided by the invention shortens the process flow, improves the production efficiency, reduces the production cost and improves the bonding strength of the composite interface. The interface bonding strength is low before the traditional 304 stainless steel clad Q235 carbon steel composite plate is hot-rolled and compounded, in order to obtain strong metallurgical bonding of the interface, multi-pass large-deformation (the single-pass deformation is not less than 30%) rolling is required, and the defects of long process flow, low production efficiency, high cost, low interface bonding strength and the like exist; the invention prepares the 304 stainless steel clad Q235 carbon steel composite plate blank with strong metallurgical bonding interface before hot rolling, only needs small deformation (the single-pass deformation is not more than 25%) during hot rolling and compounding, and has the advantages of short process flow, high production efficiency, low cost, high interface bonding strength and the like.
3. The interface bonding strength of the hot-rolled compounded 304 stainless steel Q235-coated carbon steel composite plate prepared by the invention is high, the pass deformation amount in subsequent cold rolling is large, and the cold rolling passes are obviously reduced, so the process flow is short, the production efficiency is high, and the cost is low.
Detailed Description
The present invention is described in detail below with reference to the following examples, which are necessary to point out here only for further illustration of the present invention and should not be construed as limiting the scope of the present invention, and those skilled in the art can make some insubstantial modifications and adaptations to the present invention based on the above-mentioned disclosure.
Example 1: 304 stainless steel coated Q235 carbon steel composite plate with base layer thickness of 25mm and coating layer thickness of 5mm
Putting 304 stainless steel into a smelting furnace, heating for melting, preserving heat at 1550 ℃ for 30 minutes, and introducing inert gas into the smelting furnace for protection; mechanically polishing the surface to be compounded of a Q235 carbon steel core plate with the thickness of 42mm, and then heating the surface to be compounded of the Q235 carbon steel core plate for 1 minute by using a heating device to ensure that the temperature of the surface to be compounded of the Q235 carbon steel core plate reaches 200 ℃; after the surface to be compounded of the Q235 carbon steel core plate is heated to a set temperature, rapidly pouring 304 stainless steel liquid on the surface to be compounded of the Q235 carbon steel core plate, and solidifying to obtain a 304 stainless steel Q235 carbon steel pre-compounded plate blank; and (3) controlling the 304L stainless steel coated Q235 carbon steel pre-composite plate blank to cool at a cooling speed of 50 ℃/s through a cooling device, and obtaining the 304 stainless steel coated Q235 carbon steel composite plate blank with strong metallurgical bonding interface and coating thickness of 8 mm.
Heating the 304 stainless steel coated Q235 carbon steel composite plate blank at 1050 ℃ for 60 minutes, then carrying out hot rolling with the total deformation of 40 percent, the single-pass deformation of 15-25 percent and the rolling pass of 3-5 passes, and forming to obtain the 304 stainless steel coated Q235 carbon steel composite plate with the total thickness of 30mm, the thickness of the base layer of 25mm and the thickness of the coating of 5 mm.
The hot-rolled 304 stainless steel clad Q235 carbon steel composite plate is straightened, then heat preservation is carried out for 120 minutes at 950 ℃, then fast cooling (the cooling speed is 20 ℃/s) is carried out to 450 ℃, and then air cooling is carried out to room temperature for heat treatment, so that the processing structure is changed, the required performance is obtained, and the use requirement is met.
Example 2: 304 stainless steel coated Q235 carbon steel composite plate with base layer thickness of 5mm and coating layer thickness of 1mm
Putting 304 stainless steel into a smelting furnace, heating for melting, preserving heat at 1600 ℃ for 30 minutes, and introducing inert gas into the smelting furnace for protection; mechanically polishing the surface to be compounded of a Q235 carbon steel core plate with the thickness of 10mm, and then heating the surface to be compounded of the Q235 carbon steel core plate by using a heating device for 0.5 minute to ensure that the temperature of the surface to be compounded of the Q235 carbon steel core plate reaches 300 ℃; after the surface to be compounded of the Q235 carbon steel core plate is heated to a set temperature, rapidly pouring 304 stainless steel liquid on the surface to be compounded of the Q235 carbon steel core plate, and solidifying to obtain a 304 stainless steel Q235 carbon steel pre-compounded plate blank; and (3) controlling the 304 stainless steel coated Q235 carbon steel pre-composite plate blank to cool at a cooling speed of 80 ℃/s through a cooling device, and obtaining the 304 stainless steel coated Q235 carbon steel composite plate blank with strong metallurgical bonding interface and coating thickness of 2 mm.
And heating the 304 stainless steel coated Q235 carbon steel composite plate blank at 1000 ℃ for 30 minutes, then carrying out hot rolling with the total deformation of 50 percent, the single-pass deformation of 15-25 percent and the rolling pass of 3-5 passes, and forming to obtain the 304 stainless steel coated Q235 carbon steel composite plate with the total thickness of 6mm, the thickness of the base layer of 5mm and the thickness of the coating of 1 mm.
The hot-rolled 304 stainless steel clad Q235 carbon steel composite plate is straightened, then is subjected to heat treatment of preserving heat for 60 minutes at 1000 ℃, then is rapidly cooled (the cooling speed is 25 ℃/s) to 500 ℃, and then is air-cooled to room temperature, the processing structure is changed, the required performance is obtained, and the use requirement is met.
Example 3: 304 stainless steel coated Q235 carbon steel composite thin plate with base layer thickness of 2.4mm and coating layer thickness of 0.6mm
Putting 304 stainless steel into a smelting furnace, heating for melting, preserving heat at 1600 ℃ for 30 minutes, and introducing inert gas into the smelting furnace for protection; mechanically polishing the surface to be compounded of a Q235 carbon steel core plate with the thickness of 12mm, and then heating the surface to be compounded of the Q235 carbon steel core plate by using a heating device for 0.6 minute to ensure that the temperature of the surface to be compounded of the Q235 carbon steel core plate reaches 500 ℃; after the surface to be compounded of the Q235 carbon steel core plate is heated to a set temperature, rapidly pouring 304 stainless steel liquid on the surface to be compounded of the Q235 carbon steel core plate, and solidifying to obtain a 304 stainless steel Q235 carbon steel pre-compounded plate blank; and (3) controlling the 304 stainless steel coated Q235 carbon steel pre-composite plate blank to cool at a cooling speed of 60 ℃/s through a cooling device, and obtaining the 304 stainless steel coated Q235 carbon steel composite plate blank with strong metallurgical bonding interface and coating thickness of 3 mm.
Heating the 304 stainless steel coated Q235 carbon steel composite plate blank at 1100 ℃ for 90 minutes, then carrying out hot rolling with the total deformation of 50 percent, the single-pass deformation of 15-25 percent and the rolling pass of 4-5 passes, and forming to obtain the 304 stainless steel coated Q235 carbon steel composite plate with the total thickness of 6mm, the thickness of the base layer of 5mm and the thickness of the coating of 1 mm.
And annealing and pickling the hot-rolled 304 stainless steel coated Q235 carbon steel composite plate, and then cold-rolling the 304 stainless steel coated Q235 carbon steel composite plate with the total deformation of 60%, the single-pass deformation of 10-20% and the rolling pass of 3-5 to obtain the 304 stainless steel coated Q235 carbon steel composite plate with the total thickness of 3mm, the thickness of the base layer of 2.4mm and the thickness of the coating of 0.6 mm.
Comparative example: 304 stainless steel coated Q235 carbon steel composite plate with base layer thickness of 25mm and coating layer thickness of 5mm
Putting 304 stainless steel into a smelting furnace, heating for melting, preserving heat at 1440 ℃ for 10 minutes, and introducing inert gas into the smelting furnace for protection; mechanically polishing the surface to be compounded of a Q235 carbon steel core plate with the thickness of 42mm, and then heating the surface to be compounded of the Q235 carbon steel core plate by using a heating device for 30 minutes to ensure that the temperature of the surface to be compounded of the Q235 carbon steel core plate reaches 900 ℃; after the surface to be compounded of the Q235 carbon steel core plate is heated to a set temperature, rapidly pouring 304 stainless steel liquid on the surface to be compounded of the Q235 carbon steel core plate, and solidifying to obtain a 304 stainless steel Q235 carbon steel pre-compounded plate blank; the 304L stainless steel coated Q235 carbon steel pre-composite plate blank is controlled by a cooling device to be cooled at the cooling speed of 150 ℃/s, the 304 stainless steel coated Q235 carbon steel composite plate blank with the coating thickness of 8mm is obtained, the composite interface has the defects of oxides, holes and the like, and the interface bonding strength is low.
Heating the 304 stainless steel coated Q235 carbon steel composite plate blank at 1050 ℃ for 60 minutes, then carrying out hot rolling with the total deformation of 40 percent, the single-pass deformation of 15-25 percent and the rolling pass of 3-5 passes, and forming to obtain the 304 stainless steel coated Q235 carbon steel composite plate with the total thickness of 30mm, the thickness of a base layer of 25mm and the thickness of a coating of 5mm, wherein the interface of the composite plate has a large amount of defects such as oxides and the like, and the interface bonding strength is low.
The hot-rolled 304 stainless steel clad Q235 carbon steel composite plate is straightened, then heat preservation is carried out for 120 minutes at 950 ℃, then rapid cooling (cooling speed is 20 ℃/s) is carried out to 450 ℃, then air cooling is carried out to room temperature, and the interface bonding strength after heat treatment is low, thus the use requirement can not be met.
While embodiments of the present invention have been described, the present invention is not limited to the above-described embodiments, which are intended to be illustrative rather than limiting, and many modifications may be made by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A short-process preparation method of a stainless steel coated carbon steel composite plate is characterized by comprising the following specific steps:
step 1: preserving heat of 304 stainless steel liquid in a smelting furnace at 1450-1700 ℃ for 30-120 minutes, and introducing inert gas into the smelting furnace for protection; mechanically polishing the surface to be compounded of the Q235 carbon steel core plate, and then heating the surface to be compounded of the Q235 carbon steel core plate for 0.01-10 minutes to enable the temperature of the surface to be compounded of the Q235 carbon steel core plate to reach 100-700 ℃; after the surface to be compounded of the Q235 carbon steel core plate is heated to a set temperature, the 304 stainless steel liquid is rapidly poured on the surface to be compounded of the Q235 carbon steel core plate, and a 304 stainless steel cladding Q235 carbon steel pre-compounded plate blank is obtained through solidification; controlling the 304 stainless steel coated Q235 carbon steel pre-composite plate blank to cool at a cooling speed of 1-100 ℃/s to obtain a 304 stainless steel coated Q235 carbon steel composite plate blank with a strong metallurgical bonding interface;
step 2: heating the 304 stainless steel coated Q235 carbon steel composite plate blank at 1000-1200 ℃ for 30-120 minutes, and then carrying out hot rolling with the total deformation of 30-50%, the single-pass deformation of 15-25% and the rolling pass of 2-5, so as to obtain the 304 stainless steel coated Q235 carbon steel composite plate.
2. The short-process preparation method according to claim 1, wherein the total thickness of the 304 stainless steel coated Q235 carbon steel composite board is 2-60 mm, the thickness of the base layer is 1.5-50 mm, and the thickness of the coating layer is 0.5-10 mm.
3. The short-process preparation method according to claim 1, wherein in the step 2, the 304 stainless steel coated Q235 carbon steel composite plate is subjected to cold rolling with the total deformation of 30-60%, the single-pass deformation of 10-20% and the rolling pass of 2-5 to prepare the 304 stainless steel coated Q235 carbon steel composite plate.
4. The short-process preparation method according to claim 3, wherein the total thickness of the 304 stainless steel coated Q235 carbon steel composite sheet is 0.8-6 mm, the thickness of the base layer is 0.6-5 mm, and the thickness of the coating layer is 0.2-1 mm.
5. The short flow manufacturing method of claim 1, wherein the 304 stainless steel clad Q235 carbon steel composite plate is subjected to a straightening treatment followed by a heat treatment.
6. The short-process preparation method according to claim 1, wherein in the step 1, the initial thickness of the Q235 carbon steel core plate is 3-100 mm.
7. The short-process preparation method according to claim 1, wherein in the step 1, the coating thickness of the 304 stainless steel coated Q235 carbon steel composite plate blank is 1-20 mm.
8. The short-process preparation method according to claim 1, wherein in the step 1, the surface to be compounded of the Q235 carbon steel core plate is heated by a heating device for 0.01-10 minutes in a short time.
9. The short-process preparation method according to claim 1, wherein in the step 1, the temperature of the 304 stainless steel coated Q235 carbon steel pre-composite plate blank is controlled to be reduced at a cooling speed of 1-100 ℃/s by a cooling device.
10. A 304 stainless steel clad Q235 carbon steel composite plate, wherein the composite plate is prepared by the short-flow preparation method according to any one of claims 1 to 9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114393194A (en) * | 2021-12-31 | 2022-04-26 | 舞阳钢铁有限责任公司 | Production method of stainless steel composite plate steel plate |
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