CN116140357A - Rolling composite production method of super-thick high-carbon steel plate - Google Patents
Rolling composite production method of super-thick high-carbon steel plate Download PDFInfo
- Publication number
- CN116140357A CN116140357A CN202310194975.1A CN202310194975A CN116140357A CN 116140357 A CN116140357 A CN 116140357A CN 202310194975 A CN202310194975 A CN 202310194975A CN 116140357 A CN116140357 A CN 116140357A
- Authority
- CN
- China
- Prior art keywords
- composite
- blank
- rolling
- temperature
- heating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B47/00—Auxiliary arrangements, devices or methods in connection with rolling of multi-layer sheets of metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/386—Plates
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Metal Rolling (AREA)
Abstract
The invention relates to a rolling composite production method of an ultra-thick high-carbon steel plate, which comprises the following steps of surface milling with the thickness of more than or equal to 5mm; the rough finish surface roughness Ra of the sub-blank is 6.3-12.5 mu m, the wave width S is 5-10 mm, the wave height H is 2-5 mm, and the S/H is 2.5-5; covering heat-insulating asbestos on the upper and lower surfaces of the composite blank for preheating before welding, wherein the heating temperature is 100-120 ℃ and the heating time is 30-50 min; the composite blank heating process is two-stage heating; starting rolling when the surface reddening temperature of the composite blank is 1050-1100 ℃; when the surface temperature is more than 750 ℃ and less than or equal to 800 ℃, the reddening temperature is reduced to 700-750 ℃ and then rolling and compounding are carried out. The invention can reduce crack sensitivity of the sealing joint of the ultra-thick high-carbon composite blank, improve bonding force of the composite interface, heating uniformity of the ultra-thick high-carbon composite blank and rolling force acting degree of the composite interface, avoid the defects of tearing, uncombination and the like of the interface to be compounded due to vacuum failure and low mechanical biting force of the interface to be compounded, and ensure the bonding rate of the composite interface.
Description
Technical Field
The invention relates to the technical field of metal material processing, in particular to a rolling composite production method of an extra-thick high-carbon steel plate.
Background
The mould industry level is an important mark for measuring the manufacturing industry level of a country and is also one of important guarantees that industrial products of a country keep international competitiveness. In recent years, the general situation of the development of the die industry in China is good, but the problem of shortage of ultra-thick and large-section ultra-thick steel plates, such as the prehardening plastic die steel of large household appliances and large-specification automobile bumpers, cannot realize long-term stable control production in China for various reasons, and the phenomenon that imported products occupy a large number of high-end die markets still occurs. With the large-scale development of equipment in the fields of engineering structures and the like, the super-thick steel plate becomes a material for pinching the neck in high-end manufacturing industry in China.
At present, methods for producing the ultra-thick steel plate mainly comprise a die casting method, an electroslag remelting method, a continuous casting billet method and a forging billet method. In recent years, in order to fully utilize the characteristics of excellent internal quality, high yield and the like, a new way for producing an extra thick plate by using a welding compound method is generated. The production process of the super-thick plate comprises the steps of cleaning the surfaces of two or more continuous casting blanks, stacking the continuous casting blanks, welding and sealing the peripheries of the continuous casting blanks in a vacuum environment by utilizing electron beams, and finally rolling the composite plate blanks serving as raw material groups. Among them, how to guarantee the vacuum effectiveness of the interface to be compounded of the composite blank is widely focused by many technological workers, and related research work is mostly carried out in terms of optimizing the vacuum electron beam seal welding process.
For example, in the patent document of "a vacuum electron beam welding method for extra thick slabs" applied by saddle steel, inc., the patent number is ZL 201910939032. X and the grant number is CN110681972B, a vacuum electron beam welding method applied to extra thick slabs is provided, which is used for solving the problems of serious stress concentration and overlarge welding deformation of welding joints, which are caused by large thickness and long welding seams of welding workpieces, of extra thick slabs.
For example, in the patent document of 'a vacuum electron beam seal welding method for rolling composite billets for composite plates' filed by saddle steel, the patent number is ZL201910940487.4, the grant number is CN110681973B, the square composite billets are sealed and welded by adopting a vacuum electron beam welding technology, and the sealing and welding positions, secondary directions and parameters can be effectively carried out on the square composite billets and the stress concentration and the welding deformation degree of welding seams can be reduced by optimizing and adjusting the welding positions, secondary directions and parameters.
However, the thickness of the ultra-thick steel plate which is produced in a large scale by the conventional clad-rolling technology using a multi-layer clad-stock is still limited to 200mm or less. If the super-thick steel plate with the thickness of more than 300mm is carried out, particularly the high-carbon super-thick steel plate, the problems that a multi-layer composite blank forms welding cracks in the sealing welding process, forms thermal stress cracks in the heating process and generates rolling cracks in the rolling process are easy to occur, and the yield is only about 50 percent.
Disclosure of Invention
The invention aims to provide a rolling composite production method of an extra-thick high-carbon steel plate, which can reduce crack sensitivity of a sealing joint of an extra-thick high-carbon composite blank, improve bonding force of a composite interface, heating uniformity of the extra-thick high-carbon composite blank and rolling force acting degree of the composite interface, avoid the defects of tearing, uncombination and the like of the interface to be compounded due to vacuum failure and low mechanical biting force, and ensure the bonding rate of the composite interface.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a rolling composite production method of an ultra-thick high-carbon steel plate comprises the following technical links:
1) Machining the surface of the sub-blank by adopting milling equipment to form a cuboid with required specification, wherein the milling thickness of the surface is more than or equal to 5mm; preferably 5mm thick;
2) And (5) adopting a hard grinding wheel to finish the surface to be compounded of the sub-blank. Wherein, the upper and lower surfaces of the intermediate blank and the inner side surfaces of the upper and lower blank are polished, the machining direction is along the rolling direction, the surface roughness Ra of the intermediate blank is 6.3-12.5 mu m, the wave width S is 5-10 mm, the wave height H is 2-5 mm, and the S/H is 2.5-5;
3) Heating the composite blank before welding: the multi-layer composite blank after being lifted and assembled is sent into a heating furnace, and after the upper surface and the lower surface of the multi-layer composite blank are covered with heat-insulating asbestos, the heating is started, and the heating temperature T is reached 1 Heating at 100-120 deg.cTime t 1 30-50 min;
4) Post-weld heating of the composite blank: adding heat insulation materials on the upper surface and the lower surface of the composite blank cooled after welding, and then feeding the composite blank into a heating furnace; the heating process comprises two-stage heating: one-stage heating temperature T 2 The temperature is 720-750 ℃ and the heat preservation time t 2 ＝1min/mm×D/3+t 0 Wherein D is the width of the composite blank, t 0 60 to 120 minutes; two-stage heating temperature T 3 The temperature is 1220 to 1250 ℃ and the heat preservation time t 3 ＝1min/mm×D/2；
5) Rolling of a composite blank: and removing the upper and lower surface heat insulation materials from the heated multilayer composite blank, and then rolling and compounding. Wherein, before the first pass rolling, the upper and lower surfaces of the multi-layer composite blank are watered and cooled to return the upper and lower surfaces to the red temperature T 4 Rolling at 1050-1100 deg.c; when the temperature T of the upper surface and the lower surface of the multilayer composite blank 5 When the temperature is more than 750 ℃ and less than or equal to 800 ℃, watering and cooling the upper surface and the lower surface of the water tank again to return the red temperature T of the upper surface and the lower surface of the water tank 6 Rolling and compounding at 700-750 deg.c.
The composite blank is made of high-quality carbon structural steel, and the content of C is 0.42-0.55wt%.
The thickness of the finally produced super-thick steel plate is 300-350 mm, and the rolling compression ratio is more than or equal to 2.
The multilayer composite is preferably a three-layer structure.
The sub-billets of the composite billets are hot rolled steel plates or continuous casting billets.
And the welding of the composite blank adopts vacuum electron beam seal welding.
In the invention, during the surface treatment of the sub-billets, the milling thickness is set to be more than or equal to 5mm, preferably 5mm, so as to completely remove the oxide layer and the decarburized layer on the surfaces of the sub-billets, improve the performance stability of the composite interface and avoid the defects of uncombined and layered surfaces. If the milling thickness is small, the surface oxide layer and the decarburized layer cannot be completely clear; if the milling thickness is too large, the production efficiency and the yield are reduced, and the production cost is increased.
The invention requires the machining direction of the surface of the combined surface of the sub-billets to be along the rolling direction, so that the surface roughness Ra of the combined surface is 6.3-12.5 mu m, the wave width S is 5-10 mm, the wave height H is 2-5 mm, and the S/H is 2.5-5, and the aim is to improve the overall binding force of the composite interfaces and optimize the stress propagation mode among the composite interfaces. On one hand, under the condition that the sectional area of the water surface is unchanged, the area of the interface to be compounded is further increased, the mechanical biting force between the compound interfaces in the rolling process is increased by utilizing the curved surface structure of the interface to be compounded, and the overall binding force of the compound interfaces is increased. On the other hand, the composite interface is processed into a curved surface from a plane, so that the propagation direction of stress at the composite interface is changed, and the difficulty of forming cracks or unbound defects of the composite interface is increased. If Ra and H are too small or S and S/H are too large, the composite interface area cannot be effectively improved, and the processing efficiency is low; if Ra and H are too large, or S and S/H are too small, unbound defects or inclusions are easily formed in the valleys during the rolling compounding process.
The invention adds heat-insulating asbestos on the upper and lower surfaces of the multi-layer composite blank, and then starts heating at the temperature T 1 Is heated at 100-120 ℃ for a period of time t 1 The method aims at preheating sub-blanks with a certain depth around the multilayer composite blank for 30-50 min, reduces crack sensitivity of high-carbon steel plate vacuum electron beam seal welding, does not influence an interface to be composited, and avoids forming an oxide layer due to preheating. If T 1 Too large or t 1 If the temperature is too high, the interface to be compounded is heated for too long or at too high temperature to form an oxide layer, so that inclusion or unfused defects are formed in the subsequent rolling process; if T 1 Too small or t 1 If the size is too small, the preheating of the depth of the sealing joint cannot be finished, an obvious preheating effect is formed, and the crack sensitivity of the sealing joint cannot be effectively reduced.
The invention adds heat insulating materials on the upper and lower surfaces of the multilayer composite blank, and then sends the multilayer composite blank into a heating furnace, so as to reduce the heating degree of the upper and lower surfaces of the multilayer composite blank, change the heating mode of the multilayer composite blank, and change the heating of the periphery and the upper and lower surfaces into the heating of the periphery. If the periphery and the upper surface and the lower surface of the multi-layer composite blank are heated simultaneously in the heating process, the heating degrees of the three-layer sub-blank are obviously different, the upper layer sub-blank and the lower layer sub-blank are heated quickly, the middle layer sub-blank is heated slowly, and under the action of thermal expansion, the position of the sealing joint forms extremely high thermal stress, and sealing failure is easy to cause. If the three-layer composite blank is heated only at the periphery, the heating degree of the three-layer composite blank is the same, and the three-layer composite blank is conducted heat gradually from the periphery to the center, so that the stress concentration of the seal welding joint is reduced, and the effectiveness of the vacuum of the interface to be compounded is ensured.
The invention sets the heating process as two-stage heating, one-stage heating temperature T 2 The temperature is 720-750 ℃ and the heat preservation time t 2 ＝1min/mm×D/3+t 0 Wherein D is the width of the composite blank, t 0 60 to 120 minutes; two-stage heating temperature T 3 The temperature is 1220 to 1250 ℃ and the heat preservation time t 3 =1 min/mm×d/2. The purpose is to further reduce the temperature difference between the surface and the core part, reduce the stress concentration of the seal welding joint and keep the effectiveness of seal welding in the heating process of the multilayer composite blank. Even if the heat insulating material is added to the upper and lower surfaces of the multilayer composite blank, the heat insulating capability is limited, and the heating of the upper and lower surfaces cannot be completely avoided. During the heating process of the multilayer composite blank, a certain temperature difference still exists between the surface and the core of the multilayer composite blank. And near the phase change point at about 740 ℃, the temperature difference between the inside and outside of the material is further increased due to the heat absorption of the phase change of the material, so that the thermal stress of the sealing joint is greatly improved, and the sealing failure problem still easily occurs. Thus, the present invention is set forth in T 2 In the time, the heat preservation time t is increased 0 The inner and outer temperatures are further synchronized, so that the temperature difference between the inner and outer surfaces is reduced, and the thermal stress of the seal welding joint is reduced.
Before the first pass rolling, the upper and lower surfaces of the multi-layer composite blank are watered and cooled to return the red temperature T of the upper and lower surfaces 4 The rolling is started at 1050-1100 ℃, so that the strength of the upper surface layer and the lower surface layer of the multi-layer composite blank is improved, the rolling force is more easily conducted to a composite interface, the mechanical engagement degree of the composite interface is improved, the mechanical engagement force is further increased, and the formation of unbound defects is avoided. If the temperature is too high, the surface strength is limited to be increased, and the rolling force conduction effect is small; if the temperature is too low, the temperature of the composite blank is reduced more, the required rolling force is greatly increased, the diffusion degree of the interface to be composited is reduced, and the defects of unfused and layering are easy to occur.
When the temperature T of the upper surface and the lower surface of the multilayer composite blank 5 When the temperature is 750-800 ℃, watering and cooling the upper surface and the lower surface of the water tank again,the upper and lower surfaces of the glass are made to return to the red temperature T 6 The rolling compounding is carried out after the temperature is 700-750 ℃, so that the rolling force is further increased when the temperature of the core part is 750-800 ℃ and the temperature of the surface layer is 700-750 ℃, the phase change heat release of the material is utilized, the high-temperature residence time of the material is improved, the diffusion degree of the elements of the composite interface is increased, and the integral binding force of the composite interface is improved. If T 5 If the temperature of the composite blank is too large, the temperature of the composite blank is reduced more, the required rolling force is greatly increased, the diffusion degree of the interface to be compounded is reduced, and the defects of unfused and layering are easy to occur. If T 5 Too small, or T 6 If the temperature is too large or too small, the high-temperature retention time of the composite interface cannot be prolonged by utilizing the phase change heat release of the material, and the element diffusion degree is increased.
Compared with the prior art, the invention has the beneficial effects that:
the rolling composite production method of the ultra-thick high-carbon steel plate can reduce crack sensitivity of a sealing joint of the ultra-thick high-carbon composite blank, improve bonding force of a composite interface, heating uniformity of the ultra-thick high-carbon composite blank and rolling force acting degree of the composite interface, avoid the defects that the interface to be composited is torn, unbonded and the like due to vacuum failure and low mechanical biting force, and ensure bonding rate of the composite interface.
Drawings
FIG. 1 is a schematic view of the finished surface of a neutron blank of the present invention.
Fig. 2 is a schematic view of a three-layer composite blank hoisting assembly in the invention.
FIG. 3 is a schematic view of the surface roughness finish of a sub-blank to be composited in the present invention.
In the figure: 1-single-sided finished surface, 2-double-sided finished surface, 3-upper blank, 4-middle blank and 5-lower blank.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with specific examples of the present invention, and it is apparent that the described embodiments are merely illustrative and not intended to limit the present invention.
The invention mainly comprises the following process routes:
1) And selecting the hot rolled steel plate or the continuous casting blank to be compounded as a raw material of the multilayer composite blank.
2) And (5) carrying out rough machining on the raw materials of the multilayer composite blank.
3) And (3) carrying out finish machining on the surface to be compounded of the raw materials of the multilayer composite blank.
4) And hoisting and assembling the finished multi-layer composite blank raw material.
5) And preheating the multi-layer composite blank after hoisting and assembling.
6) And carrying out vacuum electron beam seal welding on the preheated multilayer composite blank.
7) And (5) removing the surplus height of the surface of the welding head, and then sending the welding head into a heating furnace for heating.
8) And rolling and compounding the heated multilayer composite blank.
9) And (3) cutting the steel plate produced after rolling and compounding to a fixed length to obtain the ultra-thick high-carbon steel plate with the target specification.
The invention relates to a rolling composite production method of an ultra-thick high-carbon steel plate, which comprises the following main technical links:
the composite blank is made of high-quality carbon structural steel, and the content of C is 0.42-0.55wt%; the thickness of the finally produced super-thick steel plate is 300-350 mm, and the rolling compression ratio is more than or equal to 2. The multi-layer composite blank has a three-layer structure.
1) Machining the surface of the sub-blank by adopting milling equipment to form a cuboid with required specification, wherein the milling thickness of the surface is more than or equal to 5mm; preferably 5mm thick.
And removing greasy dirt on the surface of the sub-blank by adopting an organic solvent such as alcohol and the like, and removing residual processing scraps on the surface by adopting high-pressure air for purging.
2) And (5) adopting a hard grinding wheel to finish the surface to be compounded of the sub-blank. Wherein, the upper and lower surfaces of the intermediate blank 4 and the inner side surfaces of the upper blank 3 and the lower blank 5 are polished, the processing direction is along the rolling direction, the surface roughness Ra is 6.3-12.5 mu m, the wave width S is 5-10 mm, the wave height H is 2-5 mm, and the S/H is 2.5-5; as shown in fig. 1.
After finishing the finish machining of the sub-blank, purging the surface to be compounded by adopting high-pressure nitrogen to remove residual machining scraps on the surface.
And hoisting and assembling the finished sub-blanks, and horizontally stacking the three sub-blanks in sequence. Wherein, the single-sided finished sub-blank is positioned on the upper layer and the lower layer, the double-sided finished sub-blank is positioned on the middle layer, and the assembly form is shown in figure 2.
3) Heating the composite blank before welding: the multi-layer composite blank after being lifted and assembled is sent into a heating furnace, and after the upper surface and the lower surface of the multi-layer composite blank are covered with heat-insulating asbestos, the heating is started, and the heating temperature T is reached 1 Is heated at 100-120 ℃ for a period of time t 1 30-50 min.
And (3) immediately removing the heat insulation asbestos on the upper surface and the lower surface of the preheated multilayer composite blank, sending the heat insulation asbestos into a vacuum chamber, and carrying out vacuum electron beam seal welding after vacuum extraction.
And standing the sealed and welded multilayer composite blank in a vacuum chamber, and taking out after the composite blank is completely cooled to room temperature.
And after the multi-layer composite blank is taken out, the surface of the seal welding joint is treated by adopting an angle mill, so that the surface of the seal welding joint is smooth, and irregular surface shaping such as residual height, tearing and the like is removed.
4) Post-weld heating of the composite blank: adding heat insulation materials on the upper surface and the lower surface of the composite blank cooled after welding, and then feeding the composite blank into a heating furnace; the heating process comprises two-stage heating: one-stage heating temperature T 2 The temperature is 720-750 ℃ and the heat preservation time t 2 ＝1min/mm×D/3+t 0 Wherein D is the total width of the composite blank, t 0 60 to 120 minutes; two-stage heating temperature T 3 The temperature is 1220 to 1250 ℃ and the heat preservation time t 3 ＝1min/mm×D/2。
5) Rolling of a composite blank: and removing the upper and lower surface heat insulation materials from the heated multilayer composite blank, and then rolling and compounding. Wherein, before the first pass rolling, the upper and lower surfaces of the multi-layer composite blank are watered and cooled to return the upper and lower surfaces to the red temperature T 4 Rolling at 1050-1100 deg.c; when the temperature T of the upper surface and the lower surface of the multilayer composite blank 5 When the temperature is more than 750 ℃ and less than or equal to 800 ℃, watering and cooling the upper surface and the lower surface of the water tank again to return the red temperature T of the upper surface and the lower surface of the water tank 6 Rolling and compounding at 700-750 deg.c.
The basic information of the composite blanks of the examples and the comparative examples is shown in table 1; the surface treatment and preheating processes of the composite blanks of the examples and the comparative examples are shown in Table 2; the post-weld composite blank heating process for the examples and comparative examples is shown in table 3; the rolling process and results of the composite billets of the examples and comparative examples are shown in Table 4.
TABLE 1 three-layer composite blank basic information
| Numbering device | Cwt％ | Sub-blank specification |
| Example 1 | 0.44 | 230mm×2200mm×3250mm |
| Example 2 | 0.48 | 220mm×2250mm×3200mm |
| Example 3 | 0.50 | 240mm×2120mm×3340mm |
| Example 4 | 0.54 | 285mm×2400mm×3180mm |
| Comparative example 1 | 0.48 | 220mm×2250mm×3200mm |
| Comparative example 2 | 0.54 | 285mm×2400mm×3180mm |
TABLE 2 surface treatment and preheating Process information for three-layer composite blank
| Numbering device | Milling thickness, mm | Ra，μm | S，mm | H，mm | S/H | T 1 ，℃ | t 1 ，min |
| Example 1 | 6 | 8.2 | 7.6 | 2.72 | 2.8 | 110 | 38 |
| Example 2 | 6 | 9.3 | 6.2 | 1.72 | 3.6 | 108 | 38 |
| Example 3 | 7 | 11.3 | 8.5 | 1.90 | 4.5 | 112 | 42 |
| Example 4 | 8 | 10.6 | 9.3 | 2.16 | 4.3 | 113 | 46 |
| Comparative example 1 | 3 | 1.5 | - | - | - | - | |
| Comparative example 2 | 4 | 2.6 | - | - | - | - | - |
Wherein Ra, S and H are calculated by obtaining arithmetic mean values in the rolling direction.
Table 3 three-layer composite blank heating process
Table 4 three-layer composite billet rolling process and results
| Numbering device | D，mm | Thickness of final rolling, mm | Compression ratio | T 4 ，℃ | T 5 ，℃ | T 6 ，℃ | Binding rate,% |
| Example 1 | 690 | 310 | 2.23 | 1090 | 778 | 715 | 87 |
| Example 2 | 660 | 315 | 2.1 | 1088 | 773 | 708 | 84 |
| Example 3 | 720 | 320 | 2.25 | 1064 | 784 | 716 | 85 |
| Example 4 | 855 | 340 | 2.51 | 1056 | 786 | 721 | 82 |
| Comparative example 1 | 661 | 315 | 2.1 | - | - | - | 46 |
| Comparative example 2 | 854 | 340 | 2.51 | - | - | - | 44 |
By innovatively providing the sealing, heating and rolling process of the composite blank, the invention improves the mechanical biting force and the integral binding force of the composite interface, ensures the vacuum effectiveness of the interface to be compounded, reduces the conduction loss of the rolling force in the base material, increases the action degree of the rolling force on the composite interface, improves the binding stability of the composite interface, avoids the delamination and unbound defects of the composite interface, and ensures the binding rate of the composite interface.
The above embodiments are only for illustrating the technical solution of the present invention, and it should be understood by those skilled in the art that although the present invention has been described in detail with reference to the above embodiments: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention, which is intended to be encompassed by the claims.
Claims (6)
1. The rolling composite production method of the super-thick high-carbon steel plate is characterized by comprising the following technical links:
1) Milling the surface of the sub-blank, wherein the milling thickness is more than or equal to 5mm;
2) Adopting a hard grinding wheel to finish the surface to be compounded of the sub-blank, wherein the machining direction is along the rolling direction, so that the surface roughness Ra of the sub-blank is 6.3-12.5 mu m, the wave width S is 5-10 mm, the wave height H is 2-5 mm, and the S/H is 2.5-5;
3) Heating the composite blank before welding: the multi-layer composite blank is sent into a heating furnace, and after the upper surface and the lower surface of the multi-layer composite blank are covered with heat-insulating asbestos, the heating is started, and the heating temperature T is reached 1 Is heated at 100-120 ℃ for a period of time t 1 30-50 min;
4) Post-weld heating of the composite blank: adding heat insulation materials on the upper surface and the lower surface of the composite blank cooled after welding, and then feeding the composite blank into a heating furnace; the heating process comprises two-stage heating: one-stage heating temperature T 2 The temperature is 720-750 ℃ and the heat preservation time t 2 ＝1min/mm×D/3+t 0 Wherein D is the width of the composite blank, t 0 60 to 120 minutes; two-stage heating temperature T 3 The temperature is 1220 to 1250 ℃ and the heat preservation time t 3 ＝1min/mm×D/2；
5) Rolling of a composite blank: before the first pass rolling, the upper and lower surfaces of the multi-layer composite blank are watered and cooled to return the red temperature T of the upper and lower surfaces 4 Rolling at 1050-1100 deg.c; when the temperature T of the upper surface and the lower surface of the multilayer composite blank 5 When the temperature is more than 750 ℃ and less than or equal to 800 ℃, watering and cooling the upper surface and the lower surface of the water tank again to return the red temperature T of the upper surface and the lower surface of the water tank 6 Rolling and compounding at 700-750 deg.c.
2. The rolling composite production method of the super-thick high-carbon steel plate according to claim 1, wherein the composite blank raw material is carbon structural steel, and the content of C is 0.42-0.55 wt%.
3. The rolling composite production method of the super-thick high-carbon steel plate according to claim 1, wherein the thickness of the finally produced steel plate is 300-350 mm, and the rolling compression ratio is more than or equal to 2.
4. A rolling composite production method of an ultra-thick high-carbon steel plate according to claim 1 or 3, wherein the multi-layer composite blank has a three-layer structure.
5. The rolling composite production method of the super-thick high-carbon steel plate according to claim 1, wherein the sub-billets of the composite billets are hot rolled steel plates or continuous casting billets.
6. The rolling composite production method of the super-thick high-carbon steel plate according to claim 1, wherein the welding of the composite blank adopts vacuum electron beam seal welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310194975.1A CN116140357A (en) | 2023-03-03 | 2023-03-03 | Rolling composite production method of super-thick high-carbon steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310194975.1A CN116140357A (en) | 2023-03-03 | 2023-03-03 | Rolling composite production method of super-thick high-carbon steel plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116140357A true CN116140357A (en) | 2023-05-23 |
Family
ID=86373526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310194975.1A Pending CN116140357A (en) | 2023-03-03 | 2023-03-03 | Rolling composite production method of super-thick high-carbon steel plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116140357A (en) |
-
2023
- 2023-03-03 CN CN202310194975.1A patent/CN116140357A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106271414B (en) | A kind of preparation method of TMCP types bridge stainless steel clad plate | |
| CN102873091B (en) | Preparation method for wear-resistant steel and carbon structural steel composite plates | |
| CN101590596B (en) | Method for manufacturing extra-thick plate blank by accumulative roller welding process | |
| CN112139763B (en) | Manufacturing method of high-carbon equivalent high-alloy super-thick steel plate | |
| CN109692873B (en) | Thin-clad titanium steel composite plate and preparation method thereof | |
| CN110539140B (en) | Production method of super-thick steel plate for pre-hardened plastic mold | |
| CN107283117A (en) | Method for producing super-thick steel plate by composite welding of continuous casting billet | |
| CN106694549B (en) | Production method of super-thick carbon die steel plate | |
| CN110405413A (en) | Multilayer slab vacuum seal method | |
| CN114273421B (en) | Method for preparing carbon steel-stainless steel composite board for lining board in micro-oxidation atmosphere | |
| CN110539065B (en) | Vacuum electron beam assembly welding process for high-carbon equivalent extra-thick composite blank | |
| CN109692884B (en) | Titanium steel composite board with IF steel as transition layer and high-temperature preparation method thereof | |
| CN104923935A (en) | Method for welding large-thickness slabs having high alloy content | |
| CN116140357A (en) | Rolling composite production method of super-thick high-carbon steel plate | |
| CN116587692A (en) | Multilayer composite blank for producing super-thick steel plate and preparation method thereof | |
| JP2505999B2 (en) | Ultra high temperature hot forging method | |
| CN105080998A (en) | Method for preparing no-interlayer titanium steel composite plates | |
| CN107282684A (en) | Production method of stainless steel-carbon steel ultra-thick heterogeneous composite board | |
| CN105714062A (en) | Production method of high-strength extra-thick boiler drum steel plate | |
| CN108453510A (en) | Low-cost efficient assembly production method of composite board | |
| CN114523185B (en) | Vacuum diffusion composite welding production process for high-alloy thick plate blank | |
| CN106884101A (en) | A kind of high temperature resistant, kinds of anti-sulfur corrosion, antiscour antifriction alloy manufacturing method of plate thereof | |
| CN106282808B (en) | A kind of bulb flat processing tool | |
| CN118668045B (en) | High-chromium cast iron reinforced carbon steel wear-resistant composite material and preparation method thereof | |
| CN116175099B (en) | Production method of extra-thick module steel for corrosion-resistant die |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |