CN113172980B - Preparation method of stainless steel/carbon steel composite sheet strip - Google Patents
Preparation method of stainless steel/carbon steel composite sheet strip Download PDFInfo
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- CN113172980B CN113172980B CN202110517088.4A CN202110517088A CN113172980B CN 113172980 B CN113172980 B CN 113172980B CN 202110517088 A CN202110517088 A CN 202110517088A CN 113172980 B CN113172980 B CN 113172980B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0036—Heat treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
- B32B2038/0016—Abrading
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0036—Heat treatment
- B32B2038/0048—Annealing, relaxing
Abstract
The invention discloses a preparation method of a stainless steel/carbon steel composite thin plate strip, and belongs to the technical field of preparation of metal laminated composite materials. Firstly, softening and annealing a stainless steel plate strip blank and a carbon steel plate strip blank, mechanically polishing the surfaces to be compounded, laminating and assembling stainless steel/carbon steel, heating at 150-600 ℃, pre-rolling and compounding to obtain a stainless steel/carbon steel pre-compounded plate strip blank, heating at 950-1300 ℃, and finally rolling and compounding to obtain a stainless steel/carbon steel compound sheet strip. The invention has the advantages that the high-strength metallurgical bonding between the stainless steel and the carbon steel can be realized by the process of combining the pre-rolling compounding and the final rolling compounding which are carried out by heating in the air atmosphere, and the method is particularly suitable for preparing the stainless steel/carbon steel composite thin plate strip with large size and large coil weight at low cost and high efficiency.
Description
Technical Field
The invention belongs to the technical field of metal layered composite material preparation, and particularly relates to a preparation method of a stainless steel/carbon steel composite sheet strip, which is particularly suitable for efficiently preparing a large-size and large-coil-weight stainless steel/carbon steel composite sheet strip at low cost.
Background
The stainless steel/carbon steel (including stainless steel/carbon steel/stainless steel) composite sheet strip has the advantages of corrosion resistance, wear resistance, diamagnetism, decoration and the like of stainless steel, has the advantages of low cost, excellent mechanical property, easy welding, good heat conductivity and the like of carbon steel, is a structure-function integrated material with excellent comprehensive performance, and is widely applied to the fields of buildings, ships, traffic, chemical industry, daily life, national defense, military industry and the like.
At present, the industrial production mainly adopts an explosion cladding method or a hot rolling cladding method to prepare a stainless steel/carbon steel composite plate strip blank, and then the stainless steel/carbon steel composite sheet strip is prepared by subsequent hot rolling or cold rolling.
The explosion cladding method is to utilize the impact force generated by explosion of explosive to make the stainless steel plate blank and the carbon steel plate blank collide at high speed, and metallurgical bonding is realized on the interface to be clad of stainless steel and carbon steel. However, the explosive cladding method not only has the problems of large energy consumption, serious environmental pollution, complex process, low production efficiency, high product cost and the like, but also cannot continuously produce large-size heavy-coil stainless steel/carbon steel composite plate strip blanks. The hot rolling composite method requires a complicated blank-making process before hot rolling composite. The specific process flow of the hot rolling compounding method can be briefly described as that the surfaces of the stainless steel plate strip blank and the carbon steel plate strip blank to be compounded are mechanically polished → assembled according to the sequence of stainless steel/carbon steel (or carbon steel/stainless steel/separant/stainless steel/carbon steel), the periphery of the assembled blank is welded, vacuum-pumping is sealed → heating → hot rolling compounding → stainless steel/carbon steel compound plate strip blank is obtained. The problems of long process flow, discontinuous process and the like of the hot rolling composite method caused by the complicated blank making process, and the yield of the stainless steel/carbon steel composite plate strip blank is also seriously influenced by the welding and vacuumizing effects.
By way of analysis, the applicant has found that the prior art mainly comprises the following solutions:
1. uncoiling and straightening a stainless steel plate strip blank and a carbon steel plate strip blank → argon arc welding the strip → the surface to be compounded of stainless steel and carbon steel is ground and roughened on line → heated at 700-750 ℃ under the condition of helium gas protection, warm rolling and compounding under the condition of helium gas protection, online heating diffusion and solution treatment → stretching and straightening → stainless steel/carbon steel/stainless steel composite plate strip is obtained. The method adopts heating and warm rolling under helium protective atmosphere to realize stainless steel/carbon steel compounding, and then improves the interface bonding strength through subsequent heating diffusion and solid solution treatment. According to the method, helium protective atmosphere heating and warm rolling are adopted, so that the preparation condition is severe, the bonding strength of the warm-rolled stainless steel/carbon steel is not high, and the interface bonding strength of the stainless steel/carbon steel is difficult to obviously improve through subsequent heating diffusion and solid solution treatment. The method has the problems of long process flow, high production cost, low stainless steel/carbon steel interface bonding strength and the like.
2. Cleaning the surfaces of the stainless steel plate strip blank and the carbon steel plate strip blank → mechanically polishing the surfaces to be composited of stainless steel and carbon steel → forming a stainless steel/carbon steel/stainless steel composite blank according to the sequence of the stainless steel/carbon steel/stainless steel → performing one-step forming by a high-pressure cold rolling mill at room temperature → performing thermal diffusion annealing → performing finish rolling → performing softening annealing → leveling and straightening → obtaining the stainless steel/carbon steel composite plate. The method adopts a high-pressure cold rolling mill to perform cold rolling compounding under high pressure at room temperature, and then realizes the metallurgical bonding of stainless steel/carbon steel through subsequent heating diffusion annealing treatment. The stainless steel/carbon steel has large cold rolling compounding difficulty at room temperature, very high requirements on the capacity of a rolling mill, mainly mechanical bonding at an interface, low interface bonding strength, easy brittle delamination in the subsequent carrying process, low interface bonding strength after heating diffusion annealing and low yield.
Therefore, in order to solve the above problems of the current methods for manufacturing stainless steel/carbon steel composite sheet and strip, it is necessary to develop a new method for manufacturing stainless steel/carbon steel composite sheet and strip with large coil weight and large size at low cost and high efficiency.
Disclosure of Invention
The invention aims to provide a preparation method of a stainless steel/carbon steel composite sheet strip, which is characterized in that the high-strength metallurgical bonding between stainless steel and carbon steel is realized under the condition of no need of vacuum, reducing atmosphere or protective atmosphere by a process of combining pre-rolling compounding and final rolling compounding which are carried out by heating in the air atmosphere, the stainless steel/carbon steel composite sheet strip is prepared with low cost and high efficiency, and the preparation method is particularly suitable for preparing the stainless steel/carbon steel composite sheet strip with large size and large coil weight.
The preparation method of the stainless steel/carbon steel composite thin plate strip comprises the following steps:
step 1: respectively carrying out softening annealing on the stainless steel plate strip blank and the carbon steel plate strip blank in the air atmosphere;
and 2, step: respectively mechanically polishing the surfaces to be compounded of the stainless steel plate strip blank and the carbon steel plate strip blank to form polishing stripes, wherein the direction of the polishing stripes is vertical to the length direction of the stainless steel plate strip blank and the carbon steel plate strip blank, then stacking and assembling the stainless steel/carbon steel (or stainless steel/carbon steel/stainless steel) in sequence to obtain a stainless steel/carbon steel laminated blank, heating the stainless steel/carbon steel laminated blank in an air atmosphere at the heating temperature of 150-600 ℃ for 0.05-30 min to promote atomic activation of the surfaces to be compounded of the stainless steel plate strip blank and the carbon steel plate strip blank, simultaneously avoiding excessive oxidation of the surfaces to be compounded of the stainless steel plate strip blank and the carbon steel plate strip blank, and then pre-rolling and compounding the heated stainless steel/carbon steel laminated blank to obtain a stainless steel/carbon steel pre-compounded plate strip blank, wherein the pre-rolling compounding reduction rate is not less than 40%, so that the surface to be compounded of the stainless steel/carbon steel laminated blank is partially metallurgically combined, the compounding capability of the stainless steel/carbon steel plate strip blank is increased, and the stainless steel/carbon steel laminated blank is prevented from being processed in a subsequent stainless steel laminated plate strip blank layer/carbon steel plate layer lamination process;
and 3, step 3: heating the stainless steel/carbon steel pre-composite plate strip blank in an air atmosphere, and then performing final rolling compounding on the heated stainless steel/carbon steel pre-composite plate strip blank to obtain a stainless steel/carbon steel composite sheet strip, wherein the final rolling compounding reduction rate is 10% -50%, so that the high-strength metallurgical bonding of the composite interface of the stainless steel/carbon steel composite sheet strip is realized.
Further, the stainless steel strip includes, but is not limited to, at least one of 304 stainless steel strip or 316 stainless steel strip, and the carbon steel strip includes, but is not limited to, at least one of Q235 steel strip or Q345 steel strip.
Further, the stainless steel plate strip and the carbon steel plate strip are simultaneously in a single sheet form or in a roll form.
Further, the mechanical polishing is off-line mechanical polishing or on-line mechanical polishing, including but not limited to at least one of belt polishing, grinding wheel polishing, wire brush polishing, louver polishing or laser polishing.
Further, the lamination assembly is an off-line lamination assembly or an on-line lamination assembly.
Further, the heating is off-line heating or on-line heating, and is performed in vacuum, a reducing atmosphere or a protective atmosphere.
Further, the stainless steel/carbon steel composite sheet strip is a stainless steel/carbon steel laminated composite sheet strip or a stainless steel/carbon steel/stainless steel laminated composite sheet strip with 2-10 layers.
Further, the stainless steel/carbon steel composite sheet strip can be subjected to subsequent heating, straightening and finish rolling.
Further, in the step 1, the softening annealing system of the stainless steel plate strip blank is air cooling after heat preservation for 1-3 h at 950-1100 ℃, and the softening annealing system of the carbon steel plate strip blank is furnace cooling after heat preservation for 1-3 h at 880-910 ℃, so that the hardness matching requirement during rolling is met.
Further, in the step 3, the heating temperature is 950-1300 ℃, and the heat preservation time is 0.05-30 min.
The main advantages of the invention are:
(1) By adopting the method, the stainless steel/carbon steel composite sheet strip can be directly prepared, the raw material consumption of preparing the stainless steel/carbon steel composite sheet strip from the traditional thick stainless steel/carbon steel composite sheet strip is effectively reduced, the energy is saved, the high requirement on rolling equipment is lowered, the generation of intermetallic compounds of a composite interface is reduced, and the interface bonding strength is improved.
(2) By adopting the method, the pre-rolling compounding is carried out after short-time heating at the lower temperature of 150-600 ℃, so that the pre-compounding of the stainless steel plate strip blank and the carbon steel plate strip blank is realized, the procedures of stainless steel/carbon steel assembly, welding, vacuumizing, sealing blank making or explosion compounding blank making under the traditional vacuum or protective atmosphere condition are replaced, the process flow is simplified and shortened, and the yield of the blank making is improved; compared with the traditional room temperature cold rolling composite preparation of the stainless steel/carbon steel pre-composite plate strip blank, the rolling force is reduced, and partial metallurgical bonding of a stainless steel/carbon steel interface is realized, so that the brittleness-resistant layering capacity of the stainless steel/carbon steel pre-composite plate strip blank is improved, and the yield is improved.
(3) By adopting the method, the stainless steel/carbon steel pre-composite plate strip blank is subjected to single-pass hot rolling, the interface micropores are pressed, the interface high-strength metallurgical bonding is realized, the diffusion annealing treatment process of warm rolling or room temperature cold rolling of the composite stainless steel/carbon steel plate blank is replaced, and the production efficiency and the interface bonding strength of the stainless steel/carbon steel composite sheet strip are obviously improved.
(4) When the method is adopted to prepare the stainless steel/carbon steel composite sheet strip, the stainless steel/carbon steel composite sheet strip can be heated in the air atmosphere, and the heating in vacuum, reducing atmosphere or protective atmosphere is not needed, so that the equipment investment is less, the operation is convenient, the production efficiency is high, the product cost is low, and the method is particularly suitable for preparing the large-size and large-coil-weight stainless steel/carbon steel composite sheet strip.
Drawings
Fig. 1 is a schematic view of a rolling process for continuous production of stainless steel/carbon steel/stainless steel composite sheet strip in a coiled form. The device comprises a rolling mill, a uncoiling device, an online polishing device, a carbon steel plate strip blank, a stainless steel plate strip blank, an online assembly device, a stainless steel/carbon steel/stainless steel laminated blank, an online heating device, a rolling mill, a stainless steel/carbon steel/stainless steel pre-composite plate strip blank, a stainless steel/carbon steel/stainless steel composite sheet strip and a rolling device, wherein the rolling mill is used for 8 and 11, the rolling mill is used for 9, the stainless steel/carbon steel/stainless steel pre-composite plate strip blank is used for 12, and the rolling device is used for 13.
Fig. 2 is a sectional view of a 304 stainless steel/Q235 steel composite thin plate strip prepared by the method of example 1 of the present invention.
Detailed Description
The present invention is described in detail with reference to the following examples, which are intended to be illustrative only and should not be construed as limiting the scope of the invention, and that the invention will be susceptible to insubstantial modifications and variations within the spirit of the invention.
As shown in fig. 1, fig. 1 is a schematic view of a rolling process for continuously preparing a stainless steel/carbon steel/stainless steel composite thin plate strip in a coiled form. The device comprises a rolling mill, a uncoiling device, an online polishing device, a carbon steel plate strip blank, a stainless steel plate strip blank, an online assembly device, a stainless steel/carbon steel/stainless steel laminated blank, an online heating device, a rolling mill, a stainless steel/carbon steel/stainless steel pre-composite plate strip blank, a stainless steel/carbon steel/stainless steel composite sheet strip and a rolling device, wherein the rolling mill is used for 8 and 11, the rolling mill is used for 9, the stainless steel/carbon steel/stainless steel pre-composite plate strip blank is used for 12, and the rolling device is used for 13.
Example 1:
a304 stainless steel/Q235 steel composite thin plate strip is prepared by taking a single piece 304 stainless steel plate strip with the thickness of 1mm and a single piece Q235 steel plate strip with the thickness of 1.5mm as raw materials.
Respectively carrying out softening annealing treatment on the 304 stainless steel plate strip blank and the Q235 steel plate strip blank, wherein the softening annealing system of the 304 stainless steel plate strip blank is that the temperature is 1050 ℃ and the air cooling is carried out for 1h, and the softening annealing system of the Q235 steel plate strip blank is that the temperature is 880 ℃ and the furnace cooling is carried out for 1 h;
respectively carrying out off-line mechanical polishing on surfaces to be compounded of the 304 stainless steel plate strip blank and the Q235 steel plate strip blank by using an angle grinder with louver blades, removing pollutants and an oxide layer on the surfaces to be compounded to obtain a clean and rough surface to be compounded, wherein the direction of polishing stripes formed by mechanical polishing is vertical to the length directions of the 304 stainless steel plate strip blank and the Q235 steel plate strip blank;
stacking and assembling the mechanically polished 304 stainless steel plate strip and Q235 steel plate strip according to the sequence of 304 stainless steel/Q235 steel to obtain a 304 stainless steel/Q235 steel layered blank;
heating the 304 stainless steel/Q235 steel laminated blank in an air atmosphere, wherein the heating temperature is 200 ℃, and the heat preservation time is 10min, then performing pre-rolling compounding on the heated 304 stainless steel/Q235 steel laminated blank, wherein the pre-rolling compounding reduction rate is 60%, and obtaining a 304 stainless steel/Q235 steel pre-compounded plate strip blank;
heating the 304 stainless steel/Q235 steel pre-composite plate strip blank in an air atmosphere at 1100 ℃ for 20min, and performing final rolling compounding on the heated 304 stainless steel/Q235 steel pre-composite plate strip blank, wherein the final rolling compounding reduction rate is 45%, so as to obtain the 304 stainless steel/Q235 steel composite thin plate strip. The cross-sectional profile of the 304 stainless steel/Q235 steel composite thin plate strip is shown in FIG. 2.
Example 2:
a316 stainless steel/Q235 steel/316 stainless steel composite thin plate strip is prepared by taking a 316 stainless steel plate strip with the thickness of 1mm in a single sheet form and a Q235 steel plate strip with the thickness of 3mm in a single sheet form as raw materials.
Respectively carrying out softening annealing treatment on the 316 stainless steel plate strip blank and the Q235 steel plate strip blank, wherein the softening annealing system of the 316 stainless steel plate strip blank is that the temperature is 1050 ℃ and the air cooling is carried out for 1h, and the softening annealing system of the Q235 steel plate strip blank is that the temperature is 880 ℃ and the furnace cooling is carried out after the 1 h;
respectively carrying out off-line mechanical polishing on the surfaces to be compounded of the 316 stainless steel plate strip blank and the Q235 steel plate strip blank by using an angle grinder provided with a grinding wheel, removing pollutants and an oxide layer on the surface to be compounded to obtain a clean and rough surface to be compounded, wherein the direction of polishing stripes formed by mechanical polishing is vertical to the length direction of the 316 stainless steel plate strip blank and the Q235 steel plate strip blank;
stacking and assembling the mechanically polished 316 stainless steel plate strip and the Q235 steel plate strip according to the sequence of 316 stainless steel/Q235 steel/316 stainless steel to obtain a 316 stainless steel/Q235 steel/316 stainless steel laminated blank;
heating the 316 stainless steel/Q235 steel/316 stainless steel laminar blank in an air atmosphere, wherein the heating temperature is 300 ℃, and the heat preservation time is 5min, and then pre-rolling compounding is carried out on the heated 316 stainless steel/Q235 steel/316 stainless steel laminar blank, wherein the pre-rolling compounding reduction ratio is 55%, so as to obtain a 316 stainless steel/Q235 steel/316 stainless steel pre-compounded plate strip blank;
heating the 316 stainless steel/Q235 steel/316 stainless steel pre-composite plate strip blank in an air atmosphere at the heating temperature of 1100 ℃ for 10min, and performing final rolling compounding on the heated 316 stainless steel/Q235 steel/316 stainless steel pre-composite plate strip blank, wherein the final rolling compounding reduction rate is 40%, so as to obtain the 316 stainless steel/Q235 steel/316 stainless steel composite sheet strip.
Example 3:
the coiled 304 stainless steel/Q235 steel composite thin plate strip is continuously prepared by taking a coiled 304 stainless steel plate strip with the thickness of 1.5mm and a coiled Q235 steel plate strip with the thickness of 3mm as raw materials.
Respectively carrying out softening annealing treatment on a 304 stainless steel plate strip blank and a Q235 steel plate strip blank in a coiled form, wherein the softening annealing system of the 304 stainless steel plate strip blank is 1050 ℃ heat preservation for 1h for air cooling, and the softening annealing system of the Q235 steel plate strip blank is 880 ℃ heat preservation for 1h for furnace cooling;
uncoiling a coiled 304 stainless steel plate strip blank with the thickness of 1.5mm and a coiled Q235 steel plate strip blank with the thickness of 3mm by utilizing uncoiling equipment, and respectively and mechanically grinding to-be-compounded surfaces of the 304 stainless steel plate strip blank and the Q235 steel plate strip blank on line by utilizing on-line grinding equipment provided with louver blades to remove pollutants and an oxide layer on the to-be-compounded surfaces to obtain clean and rough surfaces to be compounded, wherein the direction of grinding stripes formed by mechanical grinding is vertical to the length direction of the 304 stainless steel plate strip blank and the Q235 steel plate strip blank;
stacking and assembling the mechanically polished 304 stainless steel plate strip blank and the Q235 steel plate strip blank according to the sequence of 304 stainless steel/Q235 steel by using an online assembly device to obtain a 304 stainless steel/Q235 steel laminated blank;
heating the 304 stainless steel/Q235 steel laminar blank in an air atmosphere by using on-line heating equipment, wherein the heating temperature is 600 ℃, the heat preservation time is 0.05min, then entering a rolling mill for pre-rolling compounding, and the pre-rolling compounding reduction rate is 45% to obtain a 304 stainless steel/Q235 steel pre-compounding plate strip blank;
and then heating the 304 stainless steel/Q235 steel pre-composite plate strip blank in an air atmosphere by using online heating equipment, wherein the heating temperature is 1100 ℃, the heat preservation time is 0.05min, then entering a rolling mill for final rolling and compounding, wherein the final rolling compound reduction rate is 40%, and obtaining the 304 stainless steel/Q235 steel composite thin plate strip in a coiled form by using rolling equipment.
Example 4:
taking a rolled 316 stainless steel plate strip with the thickness of 0.5mm and a rolled Q345 steel plate strip with the thickness of 4mm as raw materials, continuously preparing the rolled 316 stainless steel/Q345 steel/316 stainless steel composite thin plate strip.
Respectively carrying out softening annealing treatment on the 316 stainless steel plate strip blank in the coiled form and the Q345 steel plate strip blank in the coiled form, wherein the softening annealing system of the 316 stainless steel plate strip blank is 1050 ℃ for heat preservation and 1h for air cooling, and the softening annealing system of the Q345 steel plate strip blank is 900 ℃ for heat preservation and 1h for furnace cooling;
uncoiling a coiled 316 stainless steel plate strip blank 4 with the thickness of 0.5mm and a coiled Q345 steel plate strip blank 3 with the thickness of 4mm by using uncoiling equipment 1, and respectively carrying out online mechanical grinding on the surfaces to be compounded of the 316 stainless steel plate strip blank and the Q345 steel plate strip blank by using online grinding equipment 2 provided with abrasive belts, removing pollutants and oxide layers on the surfaces to be compounded to obtain a clean and rough surface to be compounded, wherein the direction of grinding stripes formed by mechanical grinding is vertical to the length direction of the 316 stainless steel plate strip blank and the Q345 steel plate strip blank;
laminating and assembling the mechanically polished 316 stainless steel plate strip blank and the Q345 steel plate strip blank according to the sequence of 316 stainless steel/Q345 steel/316 stainless steel by using an online assembly device 5 to obtain a 316 stainless steel/Q345 steel/316 stainless steel laminated blank 6;
heating the 316 stainless steel/Q345 steel/316 stainless steel laminar blank in an air atmosphere by using an online heating device 7, wherein the heating temperature is 600 ℃, the heat preservation time is 0.05min, then, entering a rolling mill 8 for pre-rolling compounding, and obtaining a 316 stainless steel/Q345 steel/316 stainless steel pre-compounded plate strip blank 9, wherein the pre-rolling compounding reduction rate is 50%;
and then heating the 316 stainless steel/Q345 steel/316 stainless steel pre-clad plate strip blank in an air atmosphere by using an online heating device 10, keeping the heating temperature at 1200 ℃, keeping the temperature for 0.05min, then entering a rolling mill 11 for final rolling compounding, wherein the final rolling compounding reduction rate is 40%, and obtaining the 316 stainless steel/Q345 steel/316 stainless steel composite sheet strip 12 in a coiled form by using a rolling device 13.
Claims (8)
1. A method for preparing a stainless steel/carbon steel composite sheet strip is characterized by comprising the following steps:
step 1: respectively carrying out softening annealing on a stainless steel plate strip blank and a carbon steel plate strip blank in an air atmosphere, wherein the stainless steel plate strip blank is at least one of a 304 stainless steel plate strip blank or a 316 stainless steel plate strip blank, and the carbon steel plate strip blank is at least one of a Q235 steel plate strip blank or a Q345 steel plate strip blank;
and 2, step: respectively mechanically polishing the surfaces to be compounded of the stainless steel plate strip blank and the carbon steel plate strip blank to form polishing stripes, wherein the direction of the polishing stripes is vertical to the length direction of the stainless steel plate strip blank and the carbon steel plate strip blank, then sequentially stacking and assembling stainless steel/carbon steel or stainless steel/carbon steel/stainless steel to form a stainless steel/carbon steel layered blank, heating the stainless steel/carbon steel layered blank in an air atmosphere, wherein the heating temperature is 150-600 ℃, the heat preservation time is 0.05-30 min, then performing pre-rolling compounding on the heated stainless steel/carbon steel layered blank to obtain a stainless steel/carbon steel pre-compounded plate strip blank, and the pre-rolling compounding reduction rate is more than or equal to 40%;
and step 3: heating the stainless steel/carbon steel pre-composite plate strip blank in an air atmosphere, and then performing final rolling compounding on the heated stainless steel/carbon steel pre-composite plate strip blank to obtain a stainless steel/carbon steel composite sheet strip, wherein the final rolling compounding reduction rate is 10% -50%, the heating temperature is 950-1300 ℃, and the heat preservation time is 0.05-30 min.
2. The method of claim 1, wherein the strip of stainless steel and the strip of carbon steel are simultaneously in single sheet form or in coil form.
3. The method of claim 1, wherein the mechanical polishing is off-line mechanical polishing or on-line mechanical polishing, and is at least one of belt polishing, grinding wheel polishing, wire brush polishing, louver polishing or laser polishing.
4. The method of claim 1, wherein the lamination stack is an off-line lamination stack or an on-line lamination stack.
5. The method of claim 1, wherein the heating is performed in a vacuum, a reducing atmosphere or a protective atmosphere, in an off-line heating or an on-line heating.
6. The method for manufacturing a stainless steel/carbon steel composite sheet strip according to claim 1, wherein the stainless steel/carbon steel composite sheet strip is a 2-10 layer stainless steel/carbon steel laminated composite sheet strip or a stainless steel/carbon steel/stainless steel laminated composite sheet strip.
7. The method of claim 1, wherein the stainless steel/carbon steel composite sheet strip is subsequently heated, straightened and finish rolled.
8. The method for preparing the stainless steel/carbon steel composite sheet strip according to claim 1, wherein in the step 1, the softening annealing system of the stainless steel plate strip is kept at 950 to 1100 ℃ for 1 to 3 hours and then cooled in air, and the softening annealing system of the carbon steel plate strip is kept at 880 to 910 ℃ for 1 to 3 hours and then cooled in furnace, so that the hardness matching requirement during rolling is met.
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