WO2021208333A1

WO2021208333A1 - Manufacturing method for double-layer metal composite steel plate

Info

Publication number: WO2021208333A1
Application number: PCT/CN2020/113230
Authority: WO
Inventors: 陈建才
Original assignee: 绿华投资有限公司
Priority date: 2020-04-13
Filing date: 2020-09-03
Publication date: 2021-10-21
Also published as: CN111266815A

Abstract

A manufacturing method for a double-layer metal composite steel plate, comprising the following specific steps: measuring the magnetic content; performing milling and grinding pretreatments of composite billet steel plates; applying an adhesive, and stacking and bonding the composite billet steel plates; completing welding and sealing of the composite steel plates by combining spot welding and vacuum air extraction welding; using a soaking pit to heat the welded composite steel plates at low temperature, medium temperature, and high temperature stages; removing, by a dephosphorization box, an oxide scale on the surface of the composite steel plates which are taken out of the pit, and then respectively performing rough rolling and finish rolling; straightening the composite steel plates subjected to rolling; and performing stacking for slow-cooling and flaw detection on the offline composite steel plates. The method can manufacture composite steel plates having high performance and high added values without polluting the environment, has high safety factor, and is an environmentally friendly process.

Description

Method for manufacturing double-layer metal composite steel plate

Technical field

The invention relates to a method for manufacturing a double-layer metal composite steel plate, which belongs to the technical field of metal composite material manufacturing.

Background technique

The metal composite plate refers to the combination of two or more metal plates through layer contact to achieve the effect of saving resources and reducing costs without reducing the use effect. The research of metal composite plate was first started in the United States in 1860. After more than one hundred years of development, the production technology of metal composite plate has been continuously improved, and the production methods have also increased. In 1986, the hot rolling method and thick plate were developed. Rolling method. In 1990, the continuous hot-rolled strip production method was developed, which mainly refers to the production of thin plates. The excellent combination properties of metal composite panels have been widely used in chemical, electric power, machinery, etc., and the demand is constantly increasing.

At present, the commonly used manufacturing methods of metal composite panels include explosive compounding method and explosive-rolling compound method; explosive compounding method is a kind of high practical value high-tech that uses explosives as energy for metal welding and production of metal composite materials. The biggest feature of the explosive compound method is to weld the same or any combination of metals together in a simple, rapid and strong manner in an instant. Its biggest use is to manufacture bimetals and multi-metals in various combinations, shapes, and uses. Metal composite materials; explosive composite method has high bonding strength and good reprocessing performance. Explosive composite can be applied to tantalum and lead with large melting points, titanium and carbon steel with large thermal expansion coefficients, and lead and steel with large hardness differences. The method is used for production, especially the composite of bimetals such as intermetallic compound is easily formed at the bonding interface. It is very difficult to use the usual composite method, and the explosive composite method can be used to obtain a composite board with good performance. The Chinese patent with the application number CN201110347172.2 discloses a composite steel plate and a manufacturing method thereof, and specifically discloses that the manufacturing method of the composite steel plate includes the following steps: pairing a substrate and a composite plate; polishing the surface roughness value of the bonding surface of the surface substrate Not greater than Ra 25μm; explosive welding explosives are placed on the composite plate to ignite and detonate, and explosively welded together; surface repair welding is used to repair unwelded points; heat treatment is maintained at 900-920℃ for 15-20min; the composite steel plate is cut to composite The finished size of the steel plate; the performance test is carried out according to GB/T6396-2008 to test the mechanical properties of the composite steel plate; the ultrasonic flaw detection is carried out according to the NB/T47002-2009 100% flaw detection test of the composite plate; the surface roughness value of the polished composite steel plate is not greater than Ra 2μm The composite steel plate manufactured by the method of the invention is corrosion-resistant and has a long service life, but the explosive composite method has a low safety factor and serious environmental pollution. At the same time, the composite plate produced by the explosive composite method has a large size due to the limitation of the process technology. Limitations, lack of competitiveness in the production of bimetal composite panels with thin cladding and large panel size. The explosive-rolling composite method, based on the explosive composite method, rolls the composite plate, making full use of the advantages of the explosive process, and at the same time improving the surface quality and dimensional accuracy of the composite plate. The rolling process includes hot rolling and cold rolling. Two steps of rolling, hot rolling is mainly to obtain the required sheet thickness, with a larger total processing volume, cold rolling is mainly to obtain the final accurate sheet thickness dimension, the total processing volume is small, through the explosion-rolling composite method, To a certain extent, it can make up for the shortcomings of using the explosion method alone, but the safety and environmental pollution problems brought about by it have not been effectively solved.

Summary of the invention

In order to overcome the problems of the prior art, the present invention provides a method for manufacturing a double-layer metal clad steel plate, which can be welded in a closed vacuum chamber to produce high-performance, high-value-added clad steel plates without polluting the environment, and has a safety factor High, belongs to the green environmental protection process.

The technical scheme of the present invention is as follows:

A manufacturing method of double-layer metal composite steel plate, the specific steps are as follows:

S1. Magnetic measurement: determine the size of the composite slab and roll the size, and measure the magnetic content of the composite slab;

S2, pretreatment: milling and grinding the surface of the composite billet steel plate to be composited;

S3. Adhesive: Apply adhesive on the composite surface of the treated composite blank steel plate, and stack the composite surfaces of the two composite blank steel plates coated with the adhesive face-to-face in a four-corner alignment manner;

S4. Welding: Use argon arc welding to perform spot welding on the composite boundary line of the laminated composite steel plate. After the spot welding is completed, put the composite steel plate into the vacuum chamber of the welder, and evacuate the vacuum chamber of the welder to a high vacuum state. Weld and seal around the composite interface of the composite steel plate;

S5. Heating: Use a soaking furnace to heat up the welded clad steel plate in three stages, including low temperature heating, medium temperature heating and high temperature heating, and maintain high heat for 1 to 1.5 hours before tapping, and the total time from heating to tapping Not less than 19 hours, and the temperature after heating is not less than 1270℃;

S6. Rolling: The composite steel plate after the furnace is dephosphorized to remove the oxide scale on the surface of the composite steel plate, and then rough rolling and finishing rolling are carried out. The terminal temperature of rough rolling is not less than 900℃, and the terminal temperature of finishing rolling is not less than 700℃;

S7, the clad steel plate after straightening and rolling;

S8. Slowly cool the stack of clad steel plates after off-line. After the slow cooling, the clad steel plates are 100% tested for flaw detection, cutting segmentation, printing, avoiding surface treatment and other performance tests in accordance with the JB/T4730.3-2005 standard.

Further, the thickness of the composite billet steel plate is 200-450 mm.

Further, in the step S4, spot welding is performed on each composite boundary line of the composite steel plate, three welding points are set on each side, and the spot welding length is 2 cm; the high vacuum state is that the vacuum degree is 5.0×10 ^-2 Pa.

Further, when welding around the composite interface of the composite steel plate in the step S4, the weld penetration depth is not less than 3 cm.

Further, the specific steps of heating in the low temperature section, heating in the middle temperature section and heating in the high temperature section in the step S5 are as follows:

A1. Cooling furnace with open cover. When the temperature in the soaking furnace is not higher than 550℃, it is filled with composite steel plate, and the cover is braised for 1 to 1.5 hours. During the braising process, the heating is not ignited and the temperature is maintained above 550℃;

A2. When the composite steel plate is heated in the low temperature section, it is heated to 800℃ or more at a heating rate of not more than 70℃/hour, the heating time is 3 to 3.5 hours, and the temperature is kept at the temperature above 800℃ for 2 to 2.5 hours;

A3. Increase the heating rate to no more than 110°C/hour in the medium temperature section and continue heating to above 1000°C, and the heating time is 2 to 2.5 hours;

A4. After heating in the middle temperature section, make the temperature greater than 1000℃, increase the heating rate of the soaking furnace, and use 1255～1285℃ as the target temperature. The heating speed of the high temperature section is not limited, and the high temperature heating time is 2～2.5 hours , After reaching the target temperature, maintain high temperature soaking for 7 to 7.5 hours;

A5. 1 to 1.5 hours before tapping, gradually lower the temperature to control the soaking furnace temperature below 1260°C.

Further, in the step S6, the rolling force of rough rolling is not less than 5000 tons, and the rolling force of finishing rolling is not less than 5000 tons.

Further, in step S8, the off-line temperature of the composite steel plate is 400-450°C, and the stacking slow cooling time is greater than 48 hours.

Further, the composite billet steel plate is one of ordinary carbon structural steel or low-alloy structural steel.

The present invention has the following beneficial effects:

1. The present invention provides a method for manufacturing a double-layer metal composite steel plate. In the welding process, firstly, argon arc welding is used to spot weld the composite boundary of the bonded composite steel plate, and then the whole is subjected to suction welding in a closed vacuum chamber. On the one hand, the welding method of the present invention overcomes the problems of high risk and environmental pollution in the process of using the explosive clad method for the production of clad steel plates in the prior art. The welding process of the manufacturing method of the present invention is completely sealed, with high safety and It does not pollute the environment and belongs to a green environmental protection process. On the other hand, compared to the process of fusion between the composite steel plates by the high temperature formed by the explosion by the explosive composite method, the composite steel plate produced by the welding method provided by the present invention has a high yield and can be artificially Strictly control the welding process to ensure the welding quality and the welding performance of the composite steel plate.

2. In the manufacturing method provided by the present invention, the composite steel plate is heated and rolled after welding to make the plate and the plate completely fused. The temperature is strictly controlled during the heating process of the present invention, and the heating temperature is gradually increased so that The welded clad steel plate better adapts to temperature changes, overcomes the sudden high temperature and huge temperature difference in the explosive clad process in the prior art, which causes the steel plate to crack. Yield rate and added value of clad steel plate.

Description of the drawings

Figure 1 is a schematic diagram of the process flow of the present invention;

Fig. 2 is a heating curve diagram of Example 1 of the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with specific embodiments.

Example 1

A method for manufacturing a double-layer metal clad steel plate. The metal clad blank steel plate is selected from ordinary carbon structural steel. The specific steps are as follows:

S1. Magnetic measurement: Determine the size of the composite billet steel plate and roll the size, measure the magnetic content of the composite billet steel plate, the composite billet steel plate is demagnetized to reduce the excessive magnetic content;

S2. Pretreatment: milling and grinding the surface of the composite billet steel plate; milling includes rough milling, fine milling and edge milling; rough milling first mills off the composite surface oxide scale of the composite billet steel plate, and then fine milling The composite interface is milled flat, and the milling edge mills the length and width dimensions of the composite interface to be consistent; the grinding treatment is mainly to eliminate the composite interface step difference of the milled composite billet steel plate and make it smoother;

S3. Adhesive; apply adhesive on the composite surface of the treated composite blank steel plate, and the composite surfaces of the two composite blank steel plates coated with the adhesive are stacked face-to-face in a four-corner alignment manner, and then the adhesive is applied Before, it is necessary to ensure that the interface of the composite billet steel plate to be composited is free of oil and no visible dust;

S4. Welding: Use argon arc welding to perform spot welding on the composite boundary line of the laminated composite steel plate after stacking and bonding. Each boundary of the composite interface is spot welded three, and spot welding is performed every 2 to 3 cm. After the spot welding is completed, Put the composite steel plate into the vacuum chamber of the welding machine, and pump the vacuum chamber of the welding machine to a high vacuum of 5.0×10 ^-2 Pa, and then weld and seal around the composite interface of the composite steel plate; due to heat generation during the welding process, each composite blank The carbon equivalent Ceq of the steel plate is less than 0.45, the thickness is large, and the pressing force is large when rolling. Therefore, the welding must ensure that the penetration depth of each weld must reach 3cm to ensure the welding quality;

S5. Heating: Use a soaking furnace to heat up the welded clad steel plate in three stages, including low temperature heating, medium temperature heating and high temperature heating, and maintain high heat for 1 to 1.5 hours before tapping. Less than 19 hours, the temperature after heating is not less than 1270℃;

S6. Rolling: The composite steel plate after the furnace is dephosphorized to remove the oxide scale on the surface of the composite steel plate and then subjected to rough rolling and finishing rolling; dephosphorization can be performed by a dephosphorization box, high-pressure water dephosphorization or horizontal rolling mill dephosphorization; rough rolling adopts four Roll reversible roughing mill adopts rapid rolling method. The terminal temperature of rough rolling is not less than 900℃, rolling force is not less than 5000 tons, and the longitudinal rolling, cross rolling or vertical and horizontal rolling mode is selected according to the rolling width; The rolling adopts a four-high reversible finishing mill, the final temperature of finishing rolling is not less than 700℃, and the rolling force is not less than 5000 tons;

S7. The clad steel plate after rolling is straightened by a hot straightening machine;

S8. The off-line temperature of the clad steel plate after straightening and rolling is 400～450℃. The stacking of the clad steel plate after off-line is slowly cooled, and the stacking slow cooling time is more than 48 hours. After the slow cooling is completed, the clad steel plate is 100% JB/T 4730.3-2005 standard performs flaw detection, cutting segmentation, printing, avoiding surface treatment and other performance testing.

Further, in the step S5, the heating rate of the heating in the low temperature section, the heating in the middle temperature section and the heating in the high temperature section are strictly controlled, the heating rate of the heating in the low temperature section is not more than 70°C/hour, and the heating rate of the heating in the middle temperature section is not more than 110 ℃/hour, the heating rate must be gradually increased. No, the temperature rises from the base temperature to the target temperature during the process of slowly offsetting the heating and stress release to prevent the composite steel plate from cracking due to stress release during heating; the heating rate of the high temperature section heating Without control, the initial temperature of heating in the high-temperature section is as high as 1000°C. Long-term heating has made the heating temperature of the composite steel plate uniform and the stress is released. Therefore, the heating rate of the high-temperature section does not need to be strictly controlled. The specific heating steps are as follows :

A1. Cooling furnace with open cover. When the temperature in the soaking furnace is not more than 550℃, the composite steel plate is loaded, and the steel is stewed in the cover for 1 hour. During the stewing process, the heating is not ignited and the temperature is maintained at 550℃;

A2. When the composite steel plate is heated in the low temperature section, it is heated to 800°C at a heating rate of not more than 70°C/hour, the heating time is 3 hours, and the temperature is maintained at 800°C for 2.5 hours;

A3. Increase the heating rate to no more than 110°C/hour in the middle temperature section and continue heating to 1000°C, and the heating time is 2.5 hours;

A4. When the temperature is greater than 1000℃, increase the heating rate of the soaking furnace, and use 1270℃ as the target temperature for heating. The heating rate in the high temperature section is not limited. The heating time in the high temperature section is 2 hours. After reaching the target temperature, maintain high temperature soaking for 7.5 hours. After heating for 10.5 hours, the temperature reaches 1270℃;

A5. 1.5 hours before tapping, gradually lower the temperature to control the temperature of the soaking furnace at 1260°C. The total time from heating to tapping is 20 hours.

Example 2

The difference between Embodiment 2 and Embodiment 1 is:

Low-alloy structural steel is selected for the metal clad billet steel plate;

In the step S5, the heating rate of the low temperature section heating, the medium temperature section heating and the high temperature section heating are strictly controlled, the heating rate of the low temperature section heating is not more than 70°C/hour, and the heating rate of the middle temperature section heating is not more than 110°C/hour , The heating rate must be gradually increased, otherwise, the temperature rise from the base temperature to the target temperature during the process of slowly offsetting the heating and stress release can prevent the composite steel plate from cracking due to stress release during heating; the heating rate of the high temperature section is not controlled. The initial temperature of heating in the high-temperature section is as high as 1000℃. The long-term heating has made the heating temperature of the composite steel plate uniform and the stress is also released. Therefore, the heating rate of the high-temperature section does not need to be strictly controlled. The specific heating steps are as follows: A1 Open the hood cooling furnace, when the temperature in the soaking furnace is not greater than 550℃, load the composite steel plate, and steer the steel for 1 hour in the cover. During the stewing process, the steel will not be ignited and heated, and the temperature will be maintained at 600℃;

A2. When the composite steel plate is heated in the low temperature section, it is heated to 840°C at a heating rate of not more than 70°C/hour, the heating time is 3.5 hours, and the temperature is maintained at 840°C for 2.5 hours;

A3. Increase the heating rate to no more than 110°C/hour in the middle temperature section and continue heating to 1050°C. The heating time is 2 hours;

A4. When the temperature is greater than 1000℃, increase the heating rate of the soaking furnace, and use 1285℃ as the target temperature for heating. The heating rate in the high temperature section is not limited. The heating time in the high temperature section is 2.5 hours. After reaching the target temperature, maintain high temperature soaking for 7 hours. After heating for 11 hours, the temperature reaches 1285℃;

A5. 1 hour before tapping, gradually lower the temperature to control the soaking furnace temperature at 1255°C. The total time from heating to tapping is 19 hours.

Example 3

The difference between Embodiment 3 and Embodiment 1 is:

Container steel is selected for the metal clad billet steel plate;

In the step S5, the heating rate of the low temperature section heating, the medium temperature section heating and the high temperature section heating are strictly controlled, the heating rate of the low temperature section heating is not more than 70°C/hour, and the heating rate of the medium temperature section heating is not more than 110°C/hour , The heating rate must be gradually increased. No, the temperature rise from the base temperature to the target temperature during the process of slowly offsetting the heating and stress release can prevent the composite steel plate from cracking due to stress release during heating; the heating rate of the high temperature section is not controlled. The initial temperature of the heating in the high temperature section is as high as 1000 ℃. The long-term heating has made the heating temperature of the composite steel plate uniform and the stress is also released. Therefore, the heating speed of the high temperature section heating does not need to be strictly controlled. The specific heating steps are as follows: A1 Open the hood cooling furnace, when the temperature in the soaking furnace is not greater than 550℃, insert the composite steel plate, and steer the steel for 1.5 hours in the cover. During the stewing process, the heating will not be ignited and the temperature will be maintained at 570℃;

A2. When the composite steel plate is heated in the low temperature section, it is heated to 820°C at a heating rate of not more than 70°C/hour, the heating time is 3 hours, and the temperature is maintained at 820°C for 2 hours;

A3. Increase the heating rate to no more than 110°C/hour in the middle temperature section and continue heating to 1020°C, and the heating time is 2.5 hours;

A4. When the temperature is greater than 1000℃, increase the heating rate of the soaking furnace, and use 1255℃ as the target temperature for heating. The heating rate in the high temperature section is not limited. The heating time in the high temperature section is 2 hours. After reaching the target temperature, maintain high temperature soaking for 7 hours. After heating, the temperature reaches 1255℃;

A5. 1.5 hours before tapping, gradually lower the temperature to control the soaking furnace temperature at 1250°C. The total time from heating to tapping is 19.5 hours.

The double-layer metal composite steel plates prepared according to the above-mentioned embodiments 1 to 3 are used in the fields of high-performance double-layer metal structure container manufacturing, steel pipe manufacturing, or building structure.

The above-mentioned embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the above-mentioned embodiments, and any other changes, modifications, substitutions, combinations, etc. made without departing from the spirit and principle of the present invention Simplified, all should be equivalent replacement methods, and they are all included in the protection scope of the present invention.

Claims

A method for manufacturing a double-layer metal composite steel plate, which is characterized in that the specific steps are as follows:

S1. Magnetic measurement: determine the size of the composite slab and roll the size, and measure the magnetic content of the composite slab;

S2, pretreatment: milling and grinding the surface of the composite billet steel plate to be composited;

S3. Adhesive: Apply adhesive on the composite surface of the treated composite blank steel plate, and stack the composite surfaces of the two composite blank steel plates coated with the adhesive face-to-face in a four-corner alignment manner;

S4. Welding: Use argon arc welding to perform spot welding on the composite boundary line of the laminated composite steel plate. After the spot welding is completed, put the composite steel plate into the vacuum chamber of the welder, and evacuate the vacuum chamber of the welder to a high vacuum state. Weld and seal around the composite interface of the composite steel plate;

S5. Heating: Use a soaking furnace to heat up the welded clad steel plate in three stages, including low temperature heating, medium temperature heating and high temperature heating, and maintain high heat for 1 to 1.5 hours before tapping, and the total time from heating to tapping Not less than 19 hours, and the temperature after heating is not less than 1270℃;

S6. Rolling: The composite steel plate after the furnace is dephosphorized to remove the oxide scale on the surface of the composite steel plate, and then rough rolling and finishing rolling are carried out. The terminal temperature of rough rolling is not less than 900℃, and the terminal temperature of finishing rolling is not less than 700℃;

S7, the clad steel plate after straightening and rolling;

S8. Slowly cool the stack of clad steel plates after off-line. After the slow cooling, the clad steel plates are 100% tested for flaw detection, cutting segmentation, printing, avoiding surface treatment and other performance tests in accordance with the JB/T4730.3-2005 standard.
The method for manufacturing a double-layer metal clad steel plate according to claim 1, wherein the thickness of the clad steel plate is 200-450 mm.
The method for manufacturing a double-layer metal clad steel plate according to claim 1, characterized in that: in said step S4, spot welding is performed on each composite boundary line of the clad steel plate, and three welding points are set on each side. The welding length is 2cm; the high vacuum state is a vacuum degree of 5.0×10 -2 Pa.
The method for manufacturing a three-layer metal clad steel plate according to claim 3, wherein the weld penetration depth is not less than 3 cm when welding around the clad interface of the clad steel plate in step S4.
The method for manufacturing a three-layer metal clad steel plate according to claim 1, wherein the specific steps of heating in the low temperature section, heating in the medium temperature section and heating in the high temperature section in the step S5 are as follows:

A1. Cooling furnace with open cover. When the temperature in the soaking furnace is not higher than 550℃, it is filled with composite steel plate, and the cover is braised for 1 to 1.5 hours. During the braising process, the heating is not ignited and the temperature is maintained above 550℃;

A2. When the composite steel plate is heated in the low temperature section, it is heated to 800℃ or more at a heating rate of not more than 70℃/hour, the heating time is 3 to 3.5 hours, and the temperature is kept at the temperature above 800℃ for 2 to 2.5 hours;

A3. Increase the heating rate to no more than 110°C/hour in the medium temperature section and continue heating to above 1000°C, and the heating time is 2 to 2.5 hours;

A4. After heating in the middle temperature section, make the temperature greater than 1000℃, increase the heating rate of the soaking furnace, and use 1255～1285℃ as the target temperature. The heating speed of the high temperature section is not limited, and the high temperature heating time is 2～2.5 hours , After reaching the target temperature, maintain high temperature soaking for 7 to 7.5 hours;

A5. 1 to 1.5 hours before tapping, gradually lower the temperature to control the soaking furnace temperature below 1260°C.
The method for manufacturing a three-layer metal clad steel sheet according to claim 1, wherein the rolling force of rough rolling in said step S6 is not less than 5000 tons, and the rolling force of finishing rolling is not less than 5000 tons.
The method for manufacturing a three-layer metal clad steel plate according to claim 1, wherein the lower line temperature of the clad steel plate in step S8 is 400-450°C, and the stacking slow cooling time is greater than 48 hours.
The method for manufacturing a three-layer metal clad steel plate according to claim 1, wherein the clad steel plate is one of ordinary carbon structural steel or low-alloy structural steel.