CN116274361A - Single-sided stainless steel composite board and hot continuous rolling preparation method thereof - Google Patents
Single-sided stainless steel composite board and hot continuous rolling preparation method thereof Download PDFInfo
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- CN116274361A CN116274361A CN202310179606.5A CN202310179606A CN116274361A CN 116274361 A CN116274361 A CN 116274361A CN 202310179606 A CN202310179606 A CN 202310179606A CN 116274361 A CN116274361 A CN 116274361A
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- 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
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
- B21B2015/0014—Cutting or shearing the product transversely to the rolling direction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a hot continuous rolling preparation method of a single-sided stainless steel composite plate. In the preparation method, the composite blank is heated at 1210-1270 ℃; and performing hot continuous rolling on the heated composite billet on a hot continuous rolling unit: firstly, adopting an R1 roughing mill to roll for 1-3 times at 1180-1240 ℃, wherein the reduction is more than or equal to 30mm; then, adopting an R2 roughing mill to roll for 3-5 times at 1050-1170 ℃, wherein the rolling reduction is more than or equal to 28mm; finally, adopting an F1-F7 finishing mill to roll for 5-7 times, wherein the initial rolling temperature is more than or equal to 950 ℃, and the final rolling temperature is more than or equal to 850 ℃ to obtain a composite board large plate; after the large composite plate is discharged from the hot continuous rolling unitCooling in a laminar flow cooling system, and then coiling at 560-660 ℃; the obtained composite coil is opened and leveled, and then the composite board big board is placed at the temperature T f ～T f And (3) performing stack cooling between two steel plates at +150 ℃.
Description
Technical Field
The invention belongs to the technical field of steel material preparation, and relates to a hot continuous rolling preparation method of a single-sided stainless steel composite plate and the single-sided stainless steel composite plate.
Background
With the continuous development of science and industry, common alloy or single metal is difficult to meet the requirement of industrial development on the comprehensive performance of materials, and composite boards are generated. The stainless steel composite board takes carbon steel or low alloy steel as a base layer, takes stainless steel as a multi-layer, and realizes metallurgical bonding of a composite interface by methods of explosive cladding, rolling cladding and the like, so that the resources are saved and the cost is reduced on the premise of not reducing the using effect (mechanical strength, corrosion resistance and the like). The stainless steel composite board is widely applied to industries such as petrochemical industry, pressure vessels, power equipment, medical equipment, water conservancy, papermaking, bridges and the like.
The existing stainless steel composite board adopts modes of explosive cladding, non-vacuum preparation of composite blanks, vacuum electron beam welding blank making and the like, and has the problems of poor surface quality, difficult control of the plate shape, poor interface bonding quality, low yield, low production efficiency and the like.
Disclosure of Invention
The invention aims to provide a hot continuous rolling preparation method of a single-sided stainless steel composite board, which has the advantages of excellent surface quality, excellent board shape and excellent interface bonding quality, high production efficiency and high yield.
In order to achieve the above object, an embodiment of the present invention provides a hot continuous rolling preparation method of a single-sided stainless steel composite plate, which includes the following steps:
1) Preparation of composite blank
Preparing two carbon steel billets with thickness T1, length L1 and width W1 as base materials; preparing two stainless steel billets with thickness T2, length L2 and width W2 as composite materials; l2 is less than L1, W2 is less than W1;
assembling according to the stacking sequence of the base material, the composite material and the base material to prepare a composite blank;
2) Rolling of composite billets
Heating the composite blank at 1210-1270 deg.c for total heating time not less than 1.0 xt min/mm, with t being the thickness of the composite blank and soaking for 20-40 min;
and performing hot continuous rolling on the heated composite billet on a hot continuous rolling unit: firstly, adopting an R1 roughing mill to roll for 1-3 times at 1180-1240 ℃, wherein the reduction is more than or equal to 30mm; then, adopting an R2 roughing mill to roll for 3-5 times at 1050-1170 ℃, wherein the rolling reduction is more than or equal to 28mm; finally, adopting an F1-F7 finishing mill to roll for 5-7 times, wherein the initial rolling temperature is more than or equal to 950 ℃, and the final rolling temperature is more than or equal to 850 ℃ to obtain a composite board large plate;
the large composite plate is discharged from the hot continuous rolling unit and then enters a laminar cooling system for cooling, and then is coiled, wherein the coiling temperature is 560-660 ℃ to obtain a composite coil;
the obtained composite roll is opened and segmented according to the required length and size, and then the segmented composite board is placed at the temperature T f ～T f Performing stack cooling between two steel plates at +150deg.C for 0.4min/mm×t0+ -5 min, wherein t0 is the thickness of the large composite plate; wherein, the liquid crystal display device comprises a liquid crystal display device,
T f ＝550+30[Si]-20[Mn]+15[Cr]-15[Ni]+10[Mo]wherein [ Si ]]、[Mn]、[Mo]、[Cr]、[Ni]100 times of the mass percentage of each element in the base material;
naturally cooling the cooling bed on the large composite board after the cold stacking is finished;
3) Composite board separation straightening
Cutting two side edges of the segmented composite board large board to remove parts outside the seal, and separating the composite board large board into an upper composite board small board and a lower composite board small board;
and (5) transversely flattening and cold straightening the small plates of the composite plate to obtain a single-layer stainless steel composite plate finished product.
Preferably, the step 1) of preparing the composite blank further comprises:
carrying out surface treatment on at least one surface of each of the two base materials and the two composite materials;
coating a release agent on one surface of a composite material;
assembling according to the stacking sequence of the base material, the composite material and the base material; the composite material is placed in the middle relative to the base material, the surfaces of the base material and the composite material, which are contacted with each other, are both surfaces subjected to surface treatment, and the surface of the isolating agent is coated on the other composite material;
four sealing strips with the width W3 are prepared, the W3 = 2T 2-1-2 mm, the sealing strips are attached to the four sides of two composite materials, gas shielded welding is carried out between the adjacent sealing strips and between the sealing strips and the base materials, so that the two base materials and the sealing strips form a whole, and a composite blank base blank is obtained;
A round hole is processed on the seal at the groove of the side edge of the composite blank base blank, and a seamless steel tube is welded at the round hole;
overlaying the grooves on the four sides of the composite blank base blank;
vacuumizing the composite blank through the seamless steel pipe by adopting a vacuum pump, wherein the vacuum degree is less than or equal to 10 -1 Pa, and then maintaining the pressure for more than 4 hours; and finally, sealing the seamless steel tube.
Preferably, the step of "subjecting at least one surface of each of the two base materials and the two composite materials to surface treatment" includes:
polishing one surface of each composite material to remove surface oxide skin; the method comprises the steps of,
and milling one surface of the two substrates in a manner of complementarily forming, wherein the surface is processed into a transverse inclined surface with the length of L11=L1 and the width of W11 & gtW 1, the substrate is a non-uniform thick blank with the thickness gradually changing in the transverse direction, or the surface is processed into a longitudinal inclined surface with the length of L11 & gtL 1 and the width of W11 & gtW 1, and the substrate is a non-uniform thick blank with the thickness gradually changing in the longitudinal direction.
Preferably, L2=L11-L0, W2=W11-W0, and the values of L0 and W0 are respectively 90-150 mm;
in the process of centering the composite material relative to the base material, the distance from the lateral side of the composite material to the corresponding side of the base material is half of W0, and the distance from the longitudinal side of the composite material to the corresponding side of the base material is half of L0.
Preferably, the step of "subjecting at least one surface of each of the two base materials and the two composite materials to surface treatment" includes:
milling one surface of two base materials in a mode of complementation of relative shapes, processing the surface into irregular concave-convex surfaces comprising n planes which are sequentially connected in the transverse direction, wherein the base materials are non-uniform thickness blanks with non-monotonic thickness changes in the transverse direction, the length L12=L1 of the irregular concave-convex surfaces and the total width W12 is larger than W1; or, processing the surface into an irregular concave-convex surface comprising n planes which are sequentially connected along the longitudinal direction, wherein the base material is a non-uniform thickness blank with non-monotonic thickness change along the longitudinal direction, the total length L12 of the irregular concave-convex surface is more than L1, and the width W12=W1; n is more than or equal to 2;
polishing one surface of each composite material to remove surface oxide skin; and then each composite material is bent to be matched with the corresponding irregular concave-convex surface.
Preferably, L2=L12-L0, W2=W12-W0, and the values of L0 and W0 are respectively 90-150 mm;
in the process of centering the composite material relative to the base material, the distance from the lateral side of the composite material to the corresponding side of the base material is half of W0, and the distance from the longitudinal side of the composite material to the corresponding side of the base material is half of L0.
Preferably, in the step of "brushing a release agent on one surface of a piece of composite material", the release agent used is a coating liquid containing silicon oxide and magnesium oxide, wherein the mass ratio of silicon oxide to magnesium oxide is 3:1;
the amount of the release agent applied was 20ymg/m 2 Y is the thickness ratio of the composite blank to the composite board.
Preferably, before the step of assembling according to the stacking sequence of the base material, the composite material and the base material, the composite material coated with the release agent is placed in a trolley furnace for heating and drying, the drying temperature is 340-360 ℃, and the drying time is 35-45 min.
Preferably, in the step of "brushing a release agent on one surface of a composite material", the release agent is used as components in weight ratio: 25-35% of silicon nitride, 5-10% of thermosetting amino resin and 55-70% of water;
the thickness of the coated release agent is 0.2-0.5 mm.
Preferably, before the step of assembling the base material, the composite material and the base material according to the stacking sequence, the composite material coated with the release agent is heated and dried at the temperature of 100-250 ℃ for 20-40 min.
Preferably, in the step of performing gas shielded welding between adjacent seals and between the seal and the base material, the welding speed is 300-360 mm/min, and the temperature between the seal and the base material is controlled to be 135-165 ℃ in the welding process.
Preferably, in the step of performing overlaying welding on grooves on four sides of the composite blank base blank, submerged arc overlaying welding is adopted;
before welding, baking the welding flux for 2 hours at 350 ℃, and then preserving heat for 1 hour at 150 ℃;
in the welding process, the temperature between the channels is controlled to be 135-165 ℃, and the welding speed is 420-480 mm/min.
In order to achieve the above purpose, an embodiment of the present invention provides a single-sided stainless steel composite board, which is prepared by the preparation method, wherein the chemical components and mass percentages of the base layer of the composite board are as follows: c:0.13 to 0.18 percent, si is less than or equal to 0.16 percent, mn:0.30 to 1.60 percent, P is less than or equal to 0.025 percent, S is less than or equal to 0.015 percent, nb is less than or equal to 0.030 percent, ti is less than or equal to 0.070 percent, and Al: 0.020-0.050%, and the balance being Fe and unavoidable impurities;
the total thickness of the composite board is less than or equal to 10mm, the thickness of the composite layer is more than or equal to 0.2mm, and the unevenness is less than or equal to 3mm/m;
the bonding rate of the composite interface is 100%, and the shearing strength is more than or equal to 210MPa;
the yield strength is more than or equal to 235MPa, and the tensile strength is more than or equal to 400MPa.
Compared with the prior art, the invention has the beneficial effects that: the single-sided stainless steel composite board prepared by the preparation method not only maintains the corrosion resistance of the stainless steel composite material and the mechanical strength of the carbon steel base material, but also has the advantages of excellent surface quality, excellent shape, excellent interface bonding and the like, for example, the single-sided stainless steel composite board has no obvious surface defects such as pits, side scratches and the like, and has high production efficiency, high yield, resource conservation and cost reduction.
Drawings
In the various illustrations of the invention, certain dimensions of structures or portions are exaggerated relative to other structures or portions for clarity of illustration and description, and thus serve only to illustrate the basic structure of the inventive subject matter.
FIG. 1a is a schematic cross-sectional view of a billet according to a first embodiment of the billet surface treatment step of the present invention;
fig. 1b is a schematic transverse cross-section of a billet according to a second embodiment of the blank surface treatment step of the invention, wherein the surface shape change after the surface treatment is indicated by dash-dot lines;
fig. 1c is a schematic longitudinal cross-sectional view of a billet according to a third embodiment of the blank surface treatment step of the present invention, wherein the change in surface shape after surface treatment is indicated by dash-dot lines;
fig. 1d is a schematic transverse cross-sectional view of a billet according to a fourth embodiment of the blank surface treatment step in the present invention, and illustrates the change in surface shape before (a) and after (B) the surface treatment;
fig. 1e is a schematic longitudinal cross-sectional view of a billet according to a fifth embodiment of the blank surface treatment step in the present invention, and illustrates the change in surface shape before (a) and after (B) the surface treatment;
FIG. 2a is a schematic cross-sectional view of a composite blank corresponding to FIG. 1 a;
FIG. 2b is a schematic transverse cross-sectional view of a composite blank corresponding to FIG. 1 b;
FIG. 2c is a schematic longitudinal cross-sectional view of a composite blank corresponding to FIG. 1 c;
FIG. 2d is a schematic transverse cross-sectional view of a composite blank corresponding to FIG. 1 d;
FIG. 2e is a schematic longitudinal cross-sectional view of a composite blank corresponding to FIG. 1 e;
FIG. 3a is a schematic cross-sectional view of two composite panels rolled from the composite blank of FIG. 2 a;
FIG. 3b is a schematic transverse cross-sectional view of two composite panels rolled from the composite blank of FIG. 2 b;
FIG. 3c is a schematic longitudinal cross-sectional view of two composite panels rolled from the composite blank of FIG. 2 c;
FIG. 3d is a schematic transverse cross-sectional view of two composite panels rolled from the composite blank of FIG. 2 d;
FIG. 3e is a schematic longitudinal cross-sectional view of two composite panels rolled from the composite blank of FIG. 2 e;
FIG. 4a is a block flow diagram of a composite billet rolling step according to an embodiment of the present invention;
fig. 4b is a block flow diagram of a composite billet rolling step according to yet another embodiment of the present invention.
Detailed Description
The invention provides a hot continuous rolling preparation method of a stainless steel composite plate and a composite plate prepared based on the method.
Compared with the prior art, such as explosive cladding, non-vacuum preparation of composite blanks, vacuum electron beam welding blank making and the like, the composite board prepared by the preparation method has the advantages of excellent surface quality, excellent plate shape, excellent interface combination and the like, and the hot continuous rolling process is adopted, so that the production efficiency is high, and the yield is high.
Specifically, the preparation method comprises three general steps of composite blank preparation, composite blank rolling and composite plate separation and straightening.
The total steps of the preparation of the composite blank comprise the following sub-steps:
preparing two carbon steel billets with thickness T1, length L1 and width W1 as base materials; preparing two stainless steel billets with thickness T2, length L2 and width W2 as composite materials;
carrying out surface treatment on at least one surface of each of the two base materials and the two composite materials;
coating a release agent on one surface of a composite material;
assembling according to the stacking sequence of the base material, the composite material and the base material;
four sealing strips with the width W3 are prepared, the W3 = 2T 2-1-2 mm, the sealing strips are attached to the four sides of two composite materials, gas shielded welding is carried out between the adjacent sealing strips and between the sealing strips and the base materials, so that the two base materials and the sealing strips form a whole, and a composite blank base blank is obtained;
a round hole is processed on the seal at the groove of the side edge of the composite blank base blank, and a seamless steel tube is welded at the round hole;
overlaying the grooves on the four sides of the composite blank base blank;
vacuumizing the composite blank through the seamless steel pipe by adopting a vacuum pump, wherein the vacuum degree is less than or equal to 10 -1 Pa, and then maintaining the pressure for more than 4 hours; and finally, sealing the seamless steel tube.
Further, the above sub-steps are described in detail as follows.
Step "preparing two carbon steel billets with length L1 and width W1 as base materials; and preparing two stainless steel billets with the length L2 and the width W2 as composite materials ", namely a billet preparation step.
Wherein, the thickness T1, the length L1 and the width W1 of the carbon steel billet serving as the base material are rectangular billets; similarly, the stainless steel billet as the composite material is also rectangular in thickness T2, length L2, and width W2. And L2 is smaller than L1, W2 is smaller than W1, and the length and width dimensions of the composite material are smaller than those of the base material.
As a preferable scheme, the surface oxide skin pressing depth and the surface pit depth of the carbon steel billet are less than or equal to 0.3mm, and the unevenness is less than or equal to 3mm/m; the stainless steel billet has no scratch on the surface and the unevenness is less than or equal to 2mm/m. Thus, the steel billet is prevented from entering the production line of the composite board with obvious surface defects or plate defects.
Next, as for the step "surface-treating at least one surface of each of the two base materials and the two composite materials", that is, a blank surface-treating step. The present invention is provided with five preferred embodiments, which are described separately below.
< first embodiment of the blank surface treatment step >
In this embodiment, one surface of each base material and each composite material is polished to remove surface scale, exposing metallic luster.
Referring to fig. 1a, for example, polishing is performed on the surface p1a of the base material 11a by using a grinder, belt sander or milling machine to remove surface oxide skin and expose metallic luster; similarly, polishing is performed on the surface p2a of the prepared base material 12a by using a grinder, belt sander or milling machine to remove surface scale and expose metallic luster.
Grinding and polishing the surface p3a of the prepared composite material 21a by adopting a wire wheel to remove surface oxide skin and expose metallic luster; similarly, the surface p4a of the prepared composite material 22a is polished with a wire wheel to remove surface scale and expose metallic luster.
As will be seen later, when assembling, the surface treated (polished in this embodiment) is used as a surface where the base material and the composite material contact each other, for example, the surface p1a and the surface p3a contact each other, and the surface p4a and the surface p2a contact each other, whereby the interface bonding quality can be ensured.
< second embodiment of the blank surface treatment step >
In this embodiment, as in the first embodiment, one surface (e.g., surfaces p3b and p4b in fig. 1 b) of each composite material is polished to remove surface oxide skin and expose metallic luster, which is not described again.
In this embodiment, unlike the first embodiment, the surface treatment of the substrate is performed:
referring to fig. 1b, the surface p1b of the base material 11b is milled to process the surface p1b into a surface p1b0, the surface p1b0 being a laterally inclined surface having a length l11=l1 and a width W11 > W1, and accordingly, the base material 11b is processed into a non-uniform thickness billet having a thickness that is tapered in the lateral direction (i.e., in the width direction), that is, the base material 11b is milled to have a width direction with a side to side height that is gradually increased.
Similarly, the surface p2b of the base material 12b is subjected to milling processing to process the surface p2b into a surface p2b0, the surface p2b0 being a laterally inclined surface having a length l11=l1 and a width W11 > W1, and the base material 12b being correspondingly processed into a non-uniform thickness billet having a thickness that gradually varies in the lateral direction.
In the milling process of the surface p2b of the base material 12b and the surface p1b of the base material 11b, the surfaces are complementary to each other in terms of the relative shape, that is, the processed surface p2b0 and the surface p1b0 are complementary to each other in terms of the relative shape. For example, the lateral inclination angle of the surface p2b0 (for example, the angle with the original surface p2 b) is equal to the lateral inclination angle of the surface p1b0 (for example, the angle with the original surface p1 b), whereby the upper and lower surfaces of the composite blank can be ensured to be parallel at the time of subsequent assembly.
It will be appreciated that the surface oxide scale on the surface p1b of the base material 11b and the surface p2b of the base material 12b can be removed by the above-described milling process, and metallic luster is exposed.
As will be seen later, by using the surface treated (milled in this embodiment) as the surface where the base material and the composite material contact each other, for example, the surface p1b0 and the surface p3b contact each other, and the surface p4b and the surface p2b0 contact each other, the interface bonding quality can be ensured as in the first embodiment, and the embodiment can be further used for preparing non-uniform thickness composite boards with a gradual change in lateral thickness, so as to improve the application scene and range of the composite boards.
< third embodiment of the blank surface treatment step >
This embodiment is substantially the same as the aforementioned second embodiment (surface treatment including surfaces p3c and p4 c), except that: the thickness gradient of the substrate in the transverse direction in the second embodiment is changed to the thickness gradient of the substrate in the longitudinal direction (i.e., in the length direction) in the present embodiment. The following description of the distinguishing points refers to the second embodiment, and the other identical points will not be repeated.
Referring to fig. 1c, the surface p1c of the base material 11c is milled to process the surface p1c into a surface p1c0, the surface p1c0 being a longitudinally inclined surface having a length L11 > L1 and a width w11=w1, and correspondingly, the base material 11c is processed into a non-uniform thickness billet having a thickness gradient in the longitudinal direction.
Similarly, the surface p2c of the base material 12c is subjected to milling processing to process the surface p2c into a surface p2c0, the surface p2c0 being a longitudinally inclined surface having a length L11 > L1 and a width w11=w1, and the base material 12c is correspondingly processed into a non-uniform thickness billet having a thickness that is tapered in the longitudinal direction.
In the milling process of the surface p2c of the base material 12c and the surface p1c of the base material 11c, the surfaces are made complementary to each other in terms of the relative shape, that is, the processed surface p2c0 and the surface p1c0 are made complementary to each other in terms of the relative shape. For example, the longitudinal inclination angle of the surface p2c0 (for example, the angle with the original surface p2 c) is equal to the longitudinal inclination angle of the surface p1c0 (for example, the angle with the original surface p1 c), whereby the upper and lower surfaces of the composite blank can be ensured to be parallel at the time of subsequent assembly.
It will be appreciated that the surface oxide scale on the surface p1c of the base material 11c and the surface p2c of the base material 12c can be removed by the above-described milling process, and metallic luster is exposed.
< fourth embodiment of the blank surface treatment step >
In this embodiment, one surface of each substrate is milled, and the surface is processed into an irregular uneven surface including n planes connected in order in the lateral direction, and the substrate is a non-uniform thickness blank having a non-monotonically changing thickness in the lateral direction, and the length l12=l1 and the total width W12 > W1 of the irregular surface.
For example, referring to fig. 1d, the surface p1d of the substrate 11d is milled, the surface p1d is processed from the horizontal surface in fig. 1d (a) to an irregular concave-convex surface p1d0 shown in fig. 1d (B), the irregular concave-convex surface p1d0 specifically includes n planes sequentially connected in the transverse direction, where n is equal to 2, and in the drawing, 8 planes are exemplified, and as seen in the drawing, 1 st, 3 rd, 5 th, 7 th are all transverse inclined surfaces in the direction from the left to the right of the drawing, and 2 nd, 4 th, 6 th, 8 th are all horizontal surfaces, which is of course only an example, and it is also possible to variously implement n other numbers or include no horizontal surfaces but only transverse inclined surfaces, etc.
Referring to fig. 1d, the substrate 11d is processed into a non-uniform thickness blank having a non-monotonically varying thickness in the transverse direction by milling the surface p1 d.
The length l12=l1 of the irregular concave-convex surface p1d0, that is, is not changed by milling; while the total width W12 of the irregular concave-convex surface p1d0 is greater than W1, it is understood that the total width W12 is the sum of the widths of n planes.
Correspondingly, referring to fig. 1d, the surface p2d of the base material 12d is also milled, and the surface p2d is processed from the horizontal surface in fig. 1d (a) to an irregular concave-convex surface p2d0 shown in fig. 1d (B). When the surface p2d of the base material 12d and the surface p1d of the base material 11d are milled, the surfaces are complementary to each other in terms of the relative shape, that is, the processed surface p2d0 and the surface p1d0 are complementary to each other in terms of the relative shape.
The irregular concave-convex surface p2d0 also specifically includes n planes, in the example shown in the figure, which are connected in series in the lateral direction, in accordance with the relative shape complementation. The length l12=l1 of the irregular concave-convex surface p2d0, that is, is not changed by milling; while the total width W12 of the irregular concave-convex surface p2d0 is greater than W1, it is understood that the total width W12 is the sum of the widths of n planes of the irregular concave-convex surface p2d0.
Referring to fig. 1d, by milling the surface p2d, the base material 12d is processed into a non-uniform blank having a non-monotonically varying thickness in the lateral direction, and if the milled base materials 12d and 11d are placed opposite each other, the sum of the thicknesses of the two is constant, based on the relative shape complementation of the irregular concave-convex surface p2d0 and the irregular concave-convex surface p1d 0. Thus, in the subsequent assembly, the upper and lower surfaces of the composite blank are parallel.
The surface treatment of the two substrates in the present embodiment is described above, and the surface treatment of the two composite materials is described below.
In the present embodiment, the surface p3d of the prepared composite material 21d is polished by a wire wheel to remove surface oxide skin and expose metallic luster; similarly, the surface p4d of the prepared composite material 22d is polished with a wire wheel to remove surface scale and expose metallic luster.
And further, after the surface oxide skin is removed, each composite material is bent to match the surface shape of the base material 11d, 12d, so that each composite material matches the corresponding irregular concave-convex surface. For example, the composite material 21d is folded to be matched with the corresponding irregular concave-convex surface p1d0 so as to facilitate the bonding contact during the subsequent assembly; for another example, the composite material 22d is folded to match the corresponding irregular concave-convex surface p2d0, so that the contact is facilitated in the subsequent assembly.
The surface treatment of this embodiment, like the foregoing first embodiment, can ensure the quality of interface bonding, and can be further used to prepare non-uniform thickness composite boards with non-monotonic change in transverse thickness, so as to improve the applicable scene and range of the composite boards, enhance corrosion resistance compared with the existing steel boards, and avoid frequent welding and dissimilar welding between composite boards with different thicknesses.
< fifth embodiment of the blank surface treatment step >
This embodiment differs from the fourth embodiment described above in that: the change in thickness of the substrate in the transverse direction in the fourth embodiment is changed from the non-monotonic change in thickness of the substrate in the longitudinal direction in the present embodiment.
For example, referring to fig. 1e, the surface p1e of the base material 11e is milled, the surface p1e is processed from the horizontal surface in fig. 1e (a) to an irregular concave-convex surface p1e0 shown in fig. 1e (B), the irregular concave-convex surface p1e0 specifically includes n planes sequentially connected in the longitudinal direction, where n is equal to 2, and in the drawing, 8 planes are exemplified, and as seen in the drawing, 1 st, 3 rd, 5 th, 7 th are longitudinally inclined surfaces in the direction from the left to the right of the drawing, and 2 nd, 4 th, 6 th, 8 th are horizontal surfaces, which is of course only an example, and it is also possible to variously implement n other numbers or include no horizontal surfaces but only longitudinally inclined surfaces, etc.
Referring to fig. 1e, the substrate 11e is processed into a non-uniform thickness blank having a non-monotonically varying thickness in the longitudinal direction by milling the surface p1 e.
The width w12=w1 of the irregular concave-convex surface p1e0, that is, is not changed by milling; while the total length L12 of the irregular concave-convex surface p1e0 is greater than L1, it is understood that the total length L12 is the sum of the lengths of n planes.
Correspondingly, referring to fig. 1e, the surface p2e of the base material 12e is also milled, and the surface p2e is processed from the horizontal surface in fig. 1e (a) to an irregular concave-convex surface p2e0 shown in fig. 1e (B). When the surface p2e of the base material 12e and the surface p1e of the base material 11e are milled, the surfaces are complementary to each other in terms of the relative shapes, that is, the surfaces p2e0 and p1e0 after the milling are complementary to each other.
The irregular concave-convex surface p2e0 also specifically includes n planes, in the example shown in the figure, which are connected in series in the longitudinal direction, in accordance with the relative shape complementation. The irregular concave-convex surface p2e0 has a width w12=w1 and a total length L12 > L1.
Referring to fig. 1e, by milling the surface p2e, the base material 12e is processed into a non-uniform thickness blank having a non-monotonically varying thickness in the longitudinal direction, and the sum of the thicknesses of the two parts is constant if the milled base materials 12e and 11e are placed opposite to each other based on the relative shape complementation of the irregular concave-convex surface p2e0 and the irregular concave-convex surface p1e 0. Thus, in the subsequent assembly, the upper and lower surfaces of the composite blank are parallel.
The surface treatment of the two substrates in the present embodiment is described above, and the surface treatment of the two composite materials is described below.
In the present embodiment, the surface p3e of the prepared composite material 21e is polished by a wire wheel to remove surface oxide skin and expose metallic luster; similarly, the surface p4e of the prepared composite material 22e is polished with a wire wheel to remove surface scale and expose metallic luster.
And further, after the surface oxide skin is removed, each composite material is bent to match the surface shape of the base material 11e, 12e, so that each composite material matches the corresponding irregular concave-convex surface. For example, the composite material 21e is folded to be matched with the corresponding irregular concave-convex surface p1e0 so as to facilitate the bonding contact during the subsequent assembly; for another example, the composite material 22e is bent to match the corresponding irregular concave-convex surface p2e0, so that the contact is facilitated in the subsequent assembly.
The method and the device are the same as the fourth embodiment, the application scene and range of the composite board can be improved, the corrosion resistance is enhanced compared with the existing steel board, and frequent welding and dissimilar welding among the composite boards with different thicknesses are avoided.
While the above description has been made of five preferred embodiments of the sub-steps of the surface treatment of the ingot in the composite ingot preparing step, it should be noted that, although only the surface treatment of one surface of each of the substrate and the composite material is described, it should be noted that, regardless of the above five embodiments, the descaling treatment may be further performed on the other surfaces of each of the substrate and the composite material, and although such additional descaling treatment is not necessary but may be preferable to achieve the technical effects of the present invention; for example, in addition to the descaling of the surface of the substrate facing the side of the composite, the surface of the substrate facing away from the side of the composite (i.e., the surface of the composite plate) may be descaled.
The description of the other sub-steps of the composite blank preparation step is continued below.
The step of "painting a release agent on one surface of a piece of composite material", that is, the step of painting a release agent.
In the previous blank surface treatment step, the surface of the composite material, which is in contact with the base material during assembly, is subjected to surface treatment such as polishing, so as to ensure the interface bonding quality of the composite board; the purpose of the step of brushing the release agent is to avoid the release agent, so that the composite material and the surface contacted when the composite material are assembled are combined in the rolling step of the composite blank, and finally are difficult to separate.
Based on this, a release agent is optionally applied to one of the two composites. If the selected composite material is surface treated in the previous blank surface treatment step and the other is not surface treated, the release agent is applied to the surface which is not surface treated in the release agent application step. If, as mentioned above, both surfaces of the selected composite are surface treated in the previous blank surface treatment step, then in the release agent application step, the release agent is applied to the surface intended to be faced with the other composite at the time of assembly.
For example, taking fig. 1a as an example, a release agent may be applied to the surface p6a of the composite 22a or the surface p5a of the composite 21 a.
With respect to the release agent, two preferred embodiments are provided herein, each of which is described below.
< first embodiment of the Release agent >
In this embodiment, the release agent is a coating solution containing silicon oxide and magnesium oxide, wherein the mass ratio of silicon oxide to magnesium oxide is 3:1. The isolating agent of the embodiment can achieve good isolating effect and ensure the subsequent separation of two composite board small plates.
When the release agent is adopted to paint the surface of the composite material, the amount of the paint release agent is 20ymg/m 2 That is, the weight of the release agent per unit area of the surface of the composite material was 20ymg. Wherein y is the ratio of the thickness of the composite billet produced in the composite billet preparation step to the thickness of the composite plate large plate formed by subsequent rolling, and the ratio is also called a composite billet rolling compression ratio.
Further, according to the present embodiment, after finishing the application of the release agent and before the subsequent assembly, the composite material coated with the release agent is placed in a bogie hearth furnace to be heated and dried, the drying temperature is 340-360 ℃, and the drying time is 35-45 min.
< second embodiment of Release agent >
In this embodiment, the components of the release agent are as follows by weight: 25-35% of silicon nitride, 5-10% of thermosetting amino resin and 55-70% of water. Compared with the existing isolating agent and even compared with the first embodiment of the isolating agent, the isolating agent of the embodiment not only can achieve good isolating effect and ensure the subsequent separation of two composite board small plates, but also has strong chemical stability, high temperature resistance and thermal shock resistance of the active ingredient silicon nitride, and the thermosetting amino resin serving as the binder can be cured at low temperature, has no toxicity and can achieve stronger bonding effect with little consumption, thus the isolating agent is low in cost as a whole, simple to operate and good in isolating and attaching effects.
Here, there is provided a preferred preparation method of the release agent, comprising: firstly, placing 5-10% of silicon nitride (in percentage by weight) into a container such as a beaker, and then pouring 15-25% of water for stirring; after the silicon nitride has no granular feel and no bubble, pouring 2-3% of thermosetting amino resin, and continuing stirring; when the mixture is in a viscous state, continuously pouring the residual silicon nitride and water, stirring for 3-5 min, and pouring the residual thermosetting amino resin; and (5) stirring to be sticky, and preparing the release agent.
When the release agent is adopted to paint the surface of the composite material, the thickness of the paint release agent is 0.2-0.5 mm.
Further, according to the present embodiment, after finishing the application of the release agent and before the subsequent assembly, the composite material coated with the release agent is heated and dried at 100 to 250 ℃ for 20 to 40 minutes.
Next, after the step of applying the release agent, the step of "assembling in the order of stacking the base material, the composite material, and the base material" will be described.
The step of assembling is carried out according to the stacking sequence of the base material, the composite material and the base material, namely the assembling step. Wherein, in addition to the stacking sequence of the base material, the composite material and the base material, the following needs to be satisfied:
1) The surfaces of the base material and the composite material which are contacted with each other are the surfaces subjected to the surface treatment; for example, in the first embodiment of the blank surface treatment step described above, referring to fig. 2a, the surface p2a of the substrate 12a and the surface p4a of the composite material 22a are in contact with each other, and the surface p1a of the substrate 11a and the surface p3a of the composite material 21a are in contact with each other; in the second embodiment of the blank surface treatment step described hereinbefore, with reference to fig. 2b, the surface p1b0 and the surface p3b are in contact with each other, and the surface p4b and the surface p2b0 are in contact with each other; in the third embodiment of the blank surface treatment step described above, referring to fig. 2c, the surface p1c of the substrate 11c and the surface p3c of the composite material 21c are in contact with each other, and the surface p2c of the substrate 12c and the surface p4c of the composite material 22c are in contact with each other; in the fourth embodiment of the blank surface treatment step described above, referring to fig. 2d, the irregular concave-convex surface p1d0 and the surface p3d of the composite material 21d are in contact with each other, and the irregular concave-convex surface p2d0 and the surface p4d of the composite material 22d are in contact with each other; in the fifth embodiment of the blank surface treatment step described above, referring to fig. 2e, the irregular concave-convex surface p1e0 and the surface p3e of the composite material 21e are in contact with each other, and the irregular concave-convex surface p2e0 and the surface p4e of the composite material 22e are in contact with each other;
2) The surface coated with the release agent faces the other composite material; for example, referring to fig. 2a, one of the surface p6a and the surface p5a is coated with a release agent 30a; referring to fig. 2b, one of the surface p6b and the surface p5b is coated with a release agent 30b; referring to fig. 2c, one of the surface p6c and the surface p5c is coated with a release agent 30c; referring to fig. 2d, one of the surface p6d and the surface p5d is coated with a release agent 30d; referring to fig. 2e, one of the surfaces p6e and p5e is coated with a release agent 30e;
3) The composite material is placed in the middle relative to the base material; in this regard, the foregoing describes that the length-width dimensions of the composite material are smaller than the length-width dimensions of the base material, L2 is smaller than L1, W2 is smaller than W1, and when the composite material is assembled, the distances from the two lateral sides of the composite material to the corresponding two lateral sides of the base material are equal, and the distances from the two longitudinal sides of the composite material to the corresponding two lateral sides of the base material are also equal.
The following describes the blank surface treatment step in the fifth embodiment at point 3. Since the composite material is disposed substantially vertically symmetrically, only a group of the base material and the composite material in the composite material will be described as an example, for example, the upper group.
For the first embodiment of the blank surface treatment step described above, referring to fig. 2a, the length L1, width W1 of the surface p1a of the substrate 11a, the length L2, width W2, l2=l1-L0, w2=w1-W0, and the preferred value ranges of L0 and W0 are 90 to 150mm, respectively; in the assembled state, the distance from the lateral side (corresponding to the long side of the surface p3 a) of the composite material 21a to the lateral side (corresponding to the long side of the surface p1 a) of the base material 11a is half of W0, and the distance from the longitudinal side (corresponding to the short side of the surface p3 a) of the composite material 21a to the longitudinal side (corresponding to the short side of the surface p1 a) of the base material 11a is half of L0.
For the second embodiment of the blank surface treatment step described above, referring to fig. 2b, the length L11, width W11 of the surface p1b0 of the substrate 11b, the length L2, width W2, l2=l11-L0, w2=w11-W0 of the surface p3b of the composite material 21b are preferably in the range of 90 to 150mm, respectively; in the assembled state, the distance from the lateral side (corresponding to the long side of the surface p3 b) of the composite material 21b to the lateral side (corresponding to the long side of the surface p1b 0) of the base material 11b is half of W0, and the distance from the longitudinal side (corresponding to the short side of the surface p3 b) of the composite material 21b to the longitudinal side (corresponding to the short side of the surface p1b 0) of the base material 11b is half of L0.
For the third embodiment of the blank surface treatment step described above, referring to fig. 2c, the preferred values of the length L11, width W11 of the surface p1c0 of the substrate 11c, the length L2, width W2 of the surface p3c of the composite 21c, l2=l11-L0, w2=w11-W0, L0 and W0 are respectively 90 to 150mm; in the assembled state, the distance from the lateral side (corresponding to the long side of the surface p3 c) of the composite material 21c to the lateral side (corresponding to the long side of the surface p1c 0) of the base material 11c is half of W0, and the distance from the longitudinal side (corresponding to the short side of the surface p3 c) of the composite material 21c to the longitudinal side (corresponding to the short side of the surface p1c 0) of the base material 11c is half of L0.
For the fourth embodiment of the blank surface treatment step described above, referring to fig. 2d, the length L12 and width W12 of the irregular concave-convex surface p1d0 of the substrate 11d, and the length L2 and width W2 of the surface p3d of the composite material 21d, l2=l12-L0, w2=w12-W0, and the preferred value ranges of L0 and W0 are 90 to 150mm, respectively; in the assembled state, the distance from the side edge in the widthwise direction of the composite material 21d (corresponding to the long side of the surface p3 d) to the side edge in the widthwise direction of the base material 11d (corresponding to the long side of the irregular concave-convex surface p1d 0) is half of W0, and the distance from the side edge in the longitudinal direction of the composite material 21d (corresponding to the short side of the surface p3 d) to the side edge in the longitudinal direction of the base material 11d (corresponding to the short side of the irregular concave-convex surface p1d 0) is half of L0.
For the fifth embodiment of the blank surface treatment step described above, referring to fig. 2e, the length L12 and width W12 of the irregular concave-convex surface p1e0 of the substrate 11e, and the length L2 and width W2 of the surface p3e of the composite material 21e, l2=l12-L0, w2=w12-W0, and the preferred value ranges of L0 and W0 are 90 to 150mm, respectively; in the assembled state, the distance from the side edge in the widthwise direction of the composite material 21e (corresponding to the long side of the surface p3 e) to the side edge in the widthwise direction of the base material 11e (corresponding to the long side of the irregular concave-convex surface p1e 0) is half of W0, and the distance from the side edge in the longitudinal direction of the composite material 21e (corresponding to the short side of the surface p3 e) to the side edge in the longitudinal direction of the base material 11e (corresponding to the short side of the irregular concave-convex surface p1e 0) is half of L0.
In the above description of the assembling step, in a preferred embodiment, after the assembling step is performed, the stacked four billets are integrally placed under a four-column hydraulic machine, and the opposite surfaces of the two base materials (i.e., the upper surface of the upper base material and the lower surface of the lower base material) are pressurized, where the pressure is not less than 500 tons. Thus, contact between adjacent billets can be made tighter.
Further, in the step of preparing four seals with the width W3, the seals are attached to four sides of two composite materials, and gas shielded welding is carried out between the adjacent seals and between the seals and the base materials, so that two base materials and the seals form a whole to obtain a composite blank base blank, and the four stacked steel blanks form a whole to be connected into the composite blank base blank based on the arrangement of the seals. Specifically, the composite blank base stock is: the two base materials form an upper surface and a lower surface, the two composite materials are positioned in the middle, four seals are enclosed around the two composite materials in a four-sided frame, and the two base materials are connected. In fig. 2 a-2 e, the seals are designated 40a, 40b, 40c, 40d and 40e, respectively.
The width W3=2T2-1-2 mm of the seal, namely the width of the seal is slightly smaller than the sum of the thicknesses of the two composite materials by 1-2 mm. The upper and lower composite materials are wrapped by the seal with the width, so that the wrapping effect is improved.
In the four seals, two seals are respectively attached to two lateral side edges of two composite materials, and the length L31=L2-1-2 mm; the other two seals are respectively attached to two longitudinal side edges of the two composite materials, and the length L32=W2-1-2 mm.
Preferably, the thickness T3 of the seal is 12-15 mm.
The forming mode of each seal may be directly cut out of one steel plate according to the thickness T3, the width W3, the length L31 or the length L32 without welding, or may be formed by splicing a plurality of seals of different lengths by welding, for example, the seal at both side edges in the longitudinal direction of the two composite materials in the fourth embodiment of the blank surface treatment step described above, and the seal at both side edges in the transverse direction of the two composite materials in the fifth embodiment of the blank surface treatment step described above.
Further, the seal is made of the same steel type as the base material, and preferably, the seal is made of the same material as the base material.
In the step, before gas shielded welding is performed between adjacent seals and between the seals and the base material, both ends and both sides of each seal can be polished to remove surface oxide skin, so as to improve welding effect; and/or grooves can be formed at two ends and two sides of each seal.
Further, as a preferred embodiment, in the step of performing gas shielded welding between adjacent seals and between the seal and the substrate, the welding speed is 300-360 mm/min, and the temperature between the seal and the substrate is controlled to be 135-165 ℃ in the welding process.
Next, for the step of processing a round hole on the seal at the groove on the side edge of the composite blank base blank, and welding a seamless steel tube at the round hole, wherein the groove is formed between two base materials and outside the seal; in this step, a round hole is machined to weld the seamless steel pipe so as to facilitate the subsequent evacuation of the interior of the composite blank.
As a preferred mode, the round hole is formed in the middle of the short side (i.e., the side in the longitudinal direction) of the composite green body, but is not limited thereto.
As a preferable mode, the diameter of the round hole is 8-12 mm; correspondingly, the outer diameter of the seamless steel pipe is consistent with the diameter of the round hole, the wall thickness is 1.2-2 mm, and the length is 200-400 mm.
And then, carrying out overlaying welding on grooves on four sides of the composite blank base blank in the step, and specifically adopting submerged arc overlaying welding. It will be appreciated that outside the four-sided frame formed by the seal, a four-sided frame shaped filling layer is formed by butt welding in this step, see fig. 2 a-2 e, wherein the filling layers formed by the weld deposit are denoted 50a, 50b, 50c, 50d and 50e, respectively.
As a preferred mode, before welding, the welding flux is baked for 2 hours at 350 ℃ and then is kept at 150 ℃ for 1 hour; in the welding process, the temperature between the control channels is 135-165 ℃, and the welding speed is 420-480 mm/min. Therefore, the submerged arc surfacing technology combines the sealing strip wrapping and gas shielded welding to jointly realize the stable connection of four billets, ensures the connection strength, avoids cracking abnormality in the subsequent composite billet rolling step, and further can further improve the interface bonding effect on the basis of realizing the quality advantage of the composite plate.
In addition, in the welding process, before each welding construction, welding bead attachments need to be cleaned, and welding beads are kept clean; and after welding, covering with heat-insulating cotton to insulate heat.
Next, the step of "vacuum pumping the composite blank through the seamless steel pipe by using a vacuum pump, the vacuum degree
≤10 -1 Pa, and then maintaining the pressure for more than 4 hours; finally, in the sealing treatment of the seamless steel tube, the air suction port of the vacuum pump is abutted with the seamless steel tube, and the space inside the seamless steel tube and the composite blank (such as the surface gap between the composite material and the base material, the surface gap between the composite material and the composite materialFace gap, face gap between composite material and seal, etc.) to exhaust air in the space until the vacuum degree is less than or equal to 10 -1 Pa, and the vacuum degree can be ensured by maintaining the pressure for more than 4 hours. Therefore, air in the space can be avoided, and surface oxidation at the composite interface is caused in the subsequent rolling of the composite blank, so that the bonding quality of the composite interface is ensured.
Further, in this step, the seamless steel pipe is subjected to a sealing treatment, which can be performed in a manner that is currently available in the steel field, for example, by heating the seamless steel pipe with a flame gun and flattening the pipe to effect sealing.
The above description is made in detail on the total steps of the preparation of the composite billet, and the preparation method of the present invention further includes the total steps of rolling the composite billet after the total steps of the preparation of the composite billet, as described above. Specifically, the total step of rolling the composite billet comprises the following sub-steps:
heating the composite blank at 1210-1270 deg.c for total heating time not less than 1.0 xt min/mm, with t being the thickness of the composite blank and soaking for 20-40 min;
and performing hot continuous rolling on the heated composite billet on a hot continuous rolling unit: firstly, adopting an R1 roughing mill to roll for 1-3 times at 1180-1240 ℃, wherein the reduction is more than or equal to 30mm; then, adopting an R2 roughing mill to roll for 3-5 times at 1050-1170 ℃, wherein the rolling reduction is more than or equal to 28mm; finally, adopting an F1-F7 finishing mill to roll for 5-7 times, wherein the initial rolling temperature is more than or equal to 950 ℃, and the final rolling temperature is more than or equal to 850 ℃ to obtain a composite board large plate;
The large composite plate is discharged from the hot continuous rolling unit and then enters a laminar cooling system for cooling, and then is coiled, wherein the coiling temperature is 560-660 ℃ to obtain a composite coil;
the resulting composite roll is unwound and segmented according to the desired length dimension.
In the total rolling step of the composite blank, the parameters such as the heating temperature, the heating time, the temperature in rolling, the rolling reduction, the coiling temperature and the like are controlled, so that the finally obtained composite plate can be ensured to have excellent mechanical properties.
Further, referring to fig. 4a, the composite billet rolling step further includes:
after the obtained composite coil is opened and segmented according to the required length dimension, the segmented composite board big board is placed at the temperature of T f ～T f Performing stack cooling between two steel plates at +150deg.C for 0.4min/mm×t0+ -5 min, wherein t0 is the thickness of the large composite plate; wherein, the liquid crystal display device comprises a liquid crystal display device,
T f ＝550+30[Si]-20[Mn]+15[Cr]-15[Ni]+10[Mo]wherein [ Si ]]、[Mn]、[Mo]、[Cr]、[Ni]100 times of the mass percentage of each element in the base material;
and after the cooling is finished, naturally cooling the cooling bed on the large composite board.
Therefore, the structure, the performance and the plate shape of the finally obtained composite plate can be further greatly improved by adopting the stack cooling, particularly the temperature and the stack cooling time of two steel plates in the stack cooling. Of course, in alternative embodiments, the stack cooling step may be omitted and the subsequent composite sheet separation straightening step may be entered directly after "the resulting composite roll is unwound and segmented to the desired length dimension", as shown in fig. 4 b.
The total step of rolling the composite blank is described in detail above, and the preparation method of the invention further comprises the total step of separating and straightening the composite plate as described above. Specifically, the total step of separating and straightening the composite board comprises the following sub-steps:
cutting the side edge of the large composite board obtained in the previous composite blank rolling total step by adopting a plasma cutting machine to remove the part outside the seal, and separating the large composite board into an upper composite board small board and a lower composite board small board;
and (5) transversely flattening and cold straightening the small plates of the composite plate to obtain a stainless steel composite plate finished product.
Wherein, regarding the part other than the seal in the step of cutting the side edge thereof to remove the part other than the seal, namely, the edge part on the large plate of the composite plate converted from the seal and the filling layer in the composite blank mentioned above after the previous rolling step of the composite blank. For the segmented composite board big board, except for the head composite board big board and the tail composite board big board, the two side edges of the composite board big board formed by other segments are cut, and the head composite board big board and the tail composite board big board are required to be additionally cut except for the side edges. Thus, the part is removed to expose the stainless steel cladding, and the large composite plate is separated into an upper composite plate small plate and a lower composite plate small plate without the connecting function of the part. Referring to fig. 3 a-3 e, corresponding to the five embodiments of the blank surface treatment steps described previously, fig. 3 a-3 e show the cross-sectional shape of two corresponding composite panel platelets (i.e., the final composite panel), respectively.
Each composite plate is composed of a composite layer and a base layer, wherein the composite layer is obtained by rolling an original composite material, the base layer is obtained by rolling an original base material, and in view of the fact, in fig. 3 a-3 e, the composite layer is still marked with the label of the original composite material, and the base layer is also marked with the label of the original base material.
In addition, on the basis of the foregoing embodiments of the total steps of rolling the composite billets, the present invention also provides three preferred embodiments of the total steps of rolling the composite billets, which are described below.
< first embodiment of total Rolling Process for composite Material >
In this embodiment, the total step of rolling the composite billet specifically includes the following steps:
heating the composite blank at 1220-1260 deg.c for total heating time not less than 1.0 xt min/mm, with t being the thickness of the composite blank and soaking for 20-40 min;
and performing hot continuous rolling on the heated composite billet on a hot continuous rolling unit: firstly, rolling for 1-3 times at 1190-1230 ℃ by adopting an R1 roughing mill, wherein the rolling reduction is more than or equal to 30mm; then, adopting an R2 roughing mill to roll for 3-5 times at 1060-1160 ℃ with the rolling reduction of more than or equal to 28mm; finally, adopting an F1-F7 finishing mill to roll for 5-7 times, wherein the initial rolling temperature is more than or equal to 970 ℃, and the final rolling temperature is more than or equal to 870 ℃ to obtain a composite board big board;
The large composite plate is discharged from the hot continuous rolling unit and then enters a laminar cooling system for cooling, and then is coiled, wherein the coiling temperature is 600-660 ℃ to obtain a composite coil;
the obtained composite roll is opened and segmented according to the required length and size, and then the segmented composite board is placed at the temperature T f ～T f Performing stack cooling between two steel plates at +150deg.C for 0.4min/mm×t0+ -5 min, wherein t0 is the thickness of the large composite plate; wherein, the liquid crystal display device comprises a liquid crystal display device,
T f ＝550+30[Si]-20[Mn]+15[Cr]-15[Ni]+10[Mo]wherein [ Si ]]、[Mn]、[Mo]、[Cr]、[Ni]100 times of the mass percentage of each element in the base material;
and naturally cooling the cooling bed on the large composite board to room temperature after the cooling is finished.
Based on the composite board prepared by the embodiment, the basic layer structure is 70-95% ferrite+5-30% pearlite structure, and the composite board has excellent mechanical property, interface bonding quality and plate shape.
Wherein, the chemical composition and the mass percentage of the base layer of the composite board are: c:0.14 to 0.18 percent, si is less than or equal to 0.05 percent, mn:0.30 to 0.40 percent, P is less than or equal to 0.020 percent, S is less than or equal to 0.015 percent, al:0.020 to 0.050 percent, and the balance of Fe and unavoidable impurities; the composite layer comprises the following chemical components in percentage by mass: c is less than or equal to 0.15%, si is less than or equal to 1.00%, mn is less than or equal to 2.00%, P is less than or equal to 0.045%, S is less than or equal to 0.030%, ni:6.0 to 22.0 percent, cr:16.0 to 26.0 percent, mo is less than or equal to 3.0 percent, and the balance is Fe and unavoidable impurities.
The total thickness of the composite board is less than or equal to 10mm, the thickness of the composite layer is more than or equal to 0.2mm, and the unevenness is less than or equal to 3mm/m.
The bonding rate of the composite interface of the composite board is 100%, and the shearing strength is more than or equal to 210MPa; the yield strength is more than or equal to 235MPa, the tensile strength is more than or equal to 400MPa, and the elongation after breaking is more than or equal to 26%.
The composite board is bent outwards by 180 degrees without cracks, and bent inwards by 180 degrees without cracks.
A plurality of examples implemented in this embodiment mode are provided below. In these examples, the steel grade/chemical composition of the selected composite and substrate materials are shown in table 1, respectively.
TABLE 1
In this case, the composite blank was prepared according to the embodiment of the present invention, and the substrate, composite material and composite blank thickness used are shown in table 2.
TABLE 2
| Substrate material | Composite material | Total thickness of composite blank, mm | |
| Example 1 | Q235 | 304 | 240 |
| Example 2 | Q235 | 304 | 240 |
| Example 3 | Q235 | 304L | 240 |
| Example 4 | Q235 | 304L | 240 |
Further, for each example, the clad-blank rolling step provided according to an embodiment of the present invention was performed, and specific parameters in the clad-blank rolling are shown in table 3. Wherein, in the column of the cold stacking temperatures in Table 3, "-" means that the method is implemented according to the mode of opening flat and directly entering the composite board separation straightening step after segmentation as described above, while in the column of the cold stacking temperatures, numerals are shown, the method is implemented according to the mode of placing the segmented composite board big board at the temperature T f ～T f The cooling is performed between two steel plates at +150℃.
TABLE 3 Table 3
Further, the total thickness of the composite board large plate and the thickness of the composite board small plate (i.e., the composite board finished product) prepared in each example are shown in Table 4. Each example has two different test examples of a substrate with equal thickness and a substrate with variable thickness, and in the test examples of the substrate with variable thickness, the thickness of the corresponding composite board and the thickness of the base layer are all in a thickness range (namely, the minimum thickness to the maximum thickness) instead of a fixed value.
TABLE 4 Table 4
Further, the composite panels of each example were sampled and tested, with each example having an interfacial bonding ratio of 100%, and with each example being acceptable for 180 ° in the inward bend (no cracks) and acceptable for 180 ° in the outward bend (no cracks). The composite panels of examples 3 and 4 were sampled and tested, boiled in sulfuric acid-copper sulfate solution for 20h, and after 180 ° bending, the composite layers were free of intergranular corrosion cracking. In addition, other performance test results are shown in table 5.
TABLE 5
< second embodiment of total Rolling Process for composite Material >
In this embodiment, the total step of rolling the composite billet specifically includes the following steps:
heating the composite blank at 1230-1270 deg.c for total heating time not less than 1.0 xt min/mm, t being the thickness of the composite blank and soaking for 20-40 min;
And performing hot continuous rolling on the heated composite billet on a hot continuous rolling unit: firstly, adopting an R1 roughing mill to roll for 1-3 times at 1200-1240 ℃, wherein the reduction is more than or equal to 30mm; then, adopting an R2 roughing mill to roll for 3-5 times at 1070-1170 ℃, wherein the reduction is more than or equal to 28mm; finally, adopting an F1-F7 finishing mill to roll for 5-7 times, wherein the initial rolling temperature is more than or equal to 960 ℃, and the final rolling temperature is more than or equal to 860 ℃ to obtain a composite board big board;
the large composite plate is discharged from the hot continuous rolling unit and then enters a laminar cooling system for cooling, and then is coiled, wherein the coiling temperature is 5800-640 ℃ to obtain a composite coil;
the obtained composite coil is opened and leveled, and then the composite board big board is placed at the temperature T f ～T f Performing stack cooling between two steel plates at +150deg.C for 0.4min/mm×t0+ -5 min, wherein t0 is the thickness of the large composite plate; wherein T is f ＝550+30[Si]-20[Mn]+15[Cr]-15[Ni]+10[Mo]Wherein [ Si ]]、[Mn]、[Mo]、[Cr]、[Ni]100 times of the mass percentage of each element in the base material;
and after the cooling is finished, naturally cooling the cooling bed on the large composite board.
Based on the composite board prepared by the embodiment, the basic layer structure is 70-92% ferrite+5-25% pearlite+3-5% bainite structure, and the composite board has excellent mechanical properties, interface bonding quality and plate shape.
Wherein, the chemical composition and the mass percentage of the base layer of the composite board are: c:0.14 to 0.18 percent, si:0.06% -0.16%, mn:1.10 to 1.20 percent, P is less than or equal to 0.025 percent, S is less than or equal to 0.012 percent, ti:0.050% -0.070%, al:0.020 to 0.050 percent, and the balance of Fe and unavoidable impurities; the composite layer comprises the following chemical components in percentage by mass: c is less than or equal to 0.15%, si is less than or equal to 1.00%, mn is less than or equal to 2.00%, P is less than or equal to 0.045%, S is less than or equal to 0.030%, ni:6.0 to 22.0 percent, cr:16.0 to 26.0 percent, mo is less than or equal to 3.0 percent, and the balance is Fe and unavoidable impurities.
The total thickness of the composite board is less than or equal to 10mm, the thickness of the composite layer is more than or equal to 0.2mm, and the unevenness is less than or equal to 3mm/m.
The bonding rate of the composite interface of the composite board is 100%, and the shearing strength is more than or equal to 210MPa; the yield strength is more than or equal to 335MPa, the tensile strength is more than or equal to 450MPa, and the elongation after breaking is more than or equal to 21%.
The composite board is bent outwards by 180 degrees without cracks, and bent inwards by 180 degrees without cracks.
A plurality of examples implemented in this embodiment mode are provided below. In these examples, the steel grade/chemical composition of the selected composite and substrate materials are shown in table 6, respectively.
TABLE 6
In this case, the composite blank was prepared according to the embodiment of the present invention, and the substrate, composite material and composite blank thickness used are shown in table 7.
TABLE 7
| Substrate material | Composite material | Total thickness of composite blank, mm | |
| Example 1 | Q355 | 304 | 240 |
| Example 2 | Q355 | 304 | 240 |
| Example 3 | Q355 | 304L | 240 |
| Example 4 | Q355 | 304L | 240 |
Further, for each example, the clad-blank rolling step provided according to an embodiment of the present invention was performed, and specific parameters in the clad-blank rolling are shown in table 8. Wherein, in the column of the cold stacking temperatures in Table 8, "-" means that the method is implemented according to the mode of opening flat and directly entering the composite board separation straightening step after segmentation as described above, while in the column of the cold stacking temperatures, numerals are shown, the method is implemented according to the mode of placing the segmented composite board big board at the temperature T f ～T f The cooling is performed between two steel plates at +150℃.
TABLE 8
Further, the total thickness of the composite board large plate and the thickness of the composite board small plate (i.e., the composite board finished product) prepared in each example are shown in Table 9. Each example has two different test examples of a substrate with equal thickness and a substrate with variable thickness, and in the test examples of the substrate with variable thickness, the thickness of the corresponding composite board and the thickness of the base layer are all in a thickness range (namely, the minimum thickness to the maximum thickness) instead of a fixed value.
TABLE 9
Further, the composite panels of each example were sampled and tested, with each example having an interfacial bonding ratio of 100%, and with each example being acceptable for 180 ° in the inward bend (no cracks) and acceptable for 180 ° in the outward bend (no cracks). The composite panels of examples 3 and 4 were sampled and tested, boiled in sulfuric acid-copper sulfate solution for 20h, and after 180 ° bending, the composite layers were free of intergranular corrosion cracking. In addition, other performance test results are shown in table 10.
Table 10
< third embodiment of total Rolling Process for composite Material >
In this embodiment, the total step of rolling the composite billet specifically includes the following steps:
heating the composite blank at 1210-1250 ℃ for a total heating time of not less than 1.0 Xt min/mm, wherein t is the thickness of the composite blank, and soaking time is 20-40 min;
and performing hot continuous rolling on the heated composite billet on a hot continuous rolling unit: firstly, adopting an R1 roughing mill to roll for 1-3 times at 1180-1220 ℃, wherein the reduction is more than or equal to 30mm; then, adopting an R2 roughing mill to roll for 3-5 times at 1050-1150 ℃ with the rolling reduction of more than or equal to 28mm; finally, adopting an F1-F7 finishing mill to roll for 5-7 times, wherein the initial rolling temperature is more than or equal to 950 ℃, and the final rolling temperature is more than or equal to 850 ℃ to obtain a composite board large plate;
the large composite plate is discharged from the hot continuous rolling unit and then enters a laminar cooling system for cooling, and then is coiled, wherein the coiling temperature is 560-620 ℃ to obtain a composite coil;
the obtained composite coil is opened and leveled, and then the composite board big board is placed at the temperature T f ～T f Performing stack cooling between two steel plates at +150deg.C for 0.4min/mm×t0+ -5 min, wherein t0 is the thickness of the large composite plate; wherein T is f ＝550+30[Si]-20[Mn]+15[Cr]-15[Ni]+10[Mo]Wherein [ Si ]]、[Mn]、[Mo]、[Cr]、[Ni]100 times of the mass percentage of each element in the base material;
And after the cooling is finished, naturally cooling the cooling bed on the large composite board.
Based on the composite board prepared by the embodiment, the basic layer structure is 70-90% ferrite, 5-20% pearlite and 5-10% bainite, and the composite board has excellent mechanical properties, interface bonding quality and plate shape. And by optimizing the heating temperature, the rolling temperature and the coiling temperature, the mechanical property, the interface bonding quality and the plate shape which are more excellent than those of the prior art can be achieved.
Wherein, the chemical composition and the mass percentage of the base layer of the composite board are: c:0.13 to 0.17 percent, si:0.05 to 0.15 percent of Mn:1.50 to 1.60 percent, P is less than or equal to 0.020 percent, S is less than or equal to 0.012 percent, nb:0.020 to 0.030 percent, ti:0.015% -0.025%, al:0.010 to 0.040 percent, and the balance of Fe and unavoidable impurities; the composite layer comprises the following chemical components in percentage by mass: c is less than or equal to 0.15%, si is less than or equal to 1.00%, mn is less than or equal to 2.00%, P is less than or equal to 0.045%, S is less than or equal to 0.030%, ni:6.0 to 22.0 percent, cr:16.0 to 26.0 percent, mo is less than or equal to 3.0 percent, and the balance is Fe and unavoidable impurities.
The total thickness of the composite board is less than or equal to 10mm, the thickness of the composite layer is more than or equal to 0.2mm, and the unevenness is less than or equal to 3mm/m.
The bonding rate of the composite interface of the composite board is 100%, and the shearing strength is more than or equal to 300MPa; the yield strength is more than or equal to 420MPa, the tensile strength is more than or equal to 520MPa, and the elongation after breaking is more than or equal to 18%.
The composite board is bent outwards by 180 degrees without cracks, and bent inwards by 180 degrees without cracks.
A plurality of examples implemented in this embodiment mode are provided below. In these examples, the steel grade/chemical composition of the selected composite and substrate materials are shown in Table 11, respectively.
TABLE 11
In this case, the composite blank was prepared according to the embodiment of the present invention, and the substrate, composite material and composite blank thickness used are shown in table 12.
Table 12
| Substrate material | Composite material | Total thickness of composite blank, mm | |
| Example 1 | Q420 | 304 | 240 |
| Example 2 | Q420 | 304 | 240 |
| Example 3 | Q420 | 304L | 240 |
| Example 4 | Q420 | 304L | 240 |
Further, for each example, the clad-blank rolling step provided according to an embodiment of the present invention was performed, and specific parameters in the clad-blank rolling are shown in table 13. Wherein, in the column of the cold stacking temperatures in Table 13, "-" means that the method is implemented according to the mode of opening flat and directly entering the composite board separation straightening step after segmentation as described above, while in the column of the cold stacking temperatures, numerals are shown, the method is implemented according to the mode of placing the segmented composite board big board at the temperature T f ～T f The cooling is performed between two steel plates at +150℃.
TABLE 13
Further, the total thickness of the composite board large plate and the thickness of the composite board small plate (i.e., the composite board finished product) prepared in each example are shown in Table 14. Each example has two different test examples of a substrate with equal thickness and a substrate with variable thickness, and in the test examples of the substrate with variable thickness, the thickness of the corresponding composite board and the thickness of the base layer are all in a thickness range (namely, the minimum thickness to the maximum thickness) instead of a fixed value.
TABLE 14
Further, the composite panels of each example were sampled and tested, with each example having an interfacial bonding ratio of 100%, and with each example being acceptable for 180 ° in the inward bend (no cracks) and acceptable for 180 ° in the outward bend (no cracks). The composite panels of examples 3 and 4 were sampled and tested, boiled in sulfuric acid-copper sulfate solution for 20h, and after 180 ° bending, the composite layers were free of intergranular corrosion cracking. In addition, other performance test results are shown in table 15.
TABLE 15
Compared with the prior art, the invention has the beneficial effects that: the single-sided stainless steel composite board prepared by the preparation method not only maintains the corrosion resistance of the stainless steel composite material and the mechanical strength of the carbon steel base material, but also has the advantages of excellent surface quality, excellent shape, excellent interface bonding and the like, for example, the single-sided stainless steel composite board has no obvious surface defects such as pits, side scratches and the like, and has high production efficiency, high yield, resource conservation and cost reduction; furthermore, the composite board with the thickness change is obtained through the thickness change treatment of the base material, so that the practicability is stronger and the application is wider.
Claims (14)
1. The hot continuous rolling preparation method of the single-sided stainless steel composite board is characterized by comprising the following steps of:
1) Preparation of composite blank
Preparing two carbon steel billets with thickness T1, length L1 and width W1 as base materials; preparing two stainless steel billets with thickness T2, length L2 and width W2 as composite materials; l2 is less than L1, W2 is less than W1;
assembling according to the stacking sequence of the base material, the composite material and the base material to prepare a composite blank;
2) Rolling of composite billets
Heating the composite blank at 1210-1270 deg.c for total heating time not less than 1.0 xt min/mm, with t being the thickness of the composite blank and soaking for 20-40 min;
and performing hot continuous rolling on the heated composite billet on a hot continuous rolling unit: firstly, adopting an R1 roughing mill to roll for 1-3 times at 1180-1240 ℃, wherein the reduction is more than or equal to 30mm; then, adopting an R2 roughing mill to roll for 3-5 times at 1050-1170 ℃, wherein the rolling reduction is more than or equal to 28mm; finally, adopting an F1-F7 finishing mill to roll for 5-7 times, wherein the initial rolling temperature is more than or equal to 950 ℃, and the final rolling temperature is more than or equal to 850 ℃ to obtain a composite board large plate;
the large composite plate is discharged from the hot continuous rolling unit and then enters a laminar cooling system for cooling, and then is coiled, wherein the coiling temperature is 560-660 ℃ to obtain a composite coil;
opening the obtained composite roll and segmenting according to the required length and size;
3) Composite board separation straightening
Cutting two side edges of the segmented large composite board to remove parts outside the seal, and separating the large composite board into an upper composite board small board and a lower composite board small board;
and (5) transversely flattening and cold straightening the small plates of the composite plate to obtain a single-layer stainless steel composite plate finished product.
2. The method for hot continuous rolling preparation of a single-sided stainless steel composite plate according to claim 1, wherein the step of rolling the composite plate further comprises:
after the obtained composite coil is opened and segmented according to the required length dimension, the segmented composite board big board is placed at the temperature of T f ～T f Performing stack cooling between two steel plates at +150deg.C for 0.4min/mm×t0+ -5 min, wherein t0 is the thickness of the large composite plate; wherein T is f ＝550+30[Si]-20[Mn]+15[Cr]-15[Ni]+10[Mo]Wherein [ Si ]]、[Mn]、[Mo]、[Cr]、[Ni]100 times of the mass percentage of each element in the base material;
and after the cooling is finished, naturally cooling the cooling bed on the large composite board.
3. The method for preparing the single-sided stainless steel composite plate by hot continuous rolling according to claim 1, wherein the step 1) of preparing the composite plate further comprises:
carrying out surface treatment on at least one surface of each of the two base materials and the two composite materials;
coating a release agent on one surface of a composite material;
Assembling according to the stacking sequence of the base material, the composite material and the base material; the composite material is placed in the middle relative to the base material, the surfaces of the base material and the composite material, which are contacted with each other, are both surfaces subjected to surface treatment, and the surface of the isolating agent is coated on the other composite material;
four sealing strips with the width W3 are prepared, the W3 = 2T 2-1-2 mm, the sealing strips are attached to the four sides of two composite materials, gas shielded welding is carried out between the adjacent sealing strips and between the sealing strips and the base materials, so that the two base materials and the sealing strips form a whole, and a composite blank base blank is obtained;
a round hole is processed on the seal at the groove of the side edge of the composite blank base blank, and a seamless steel tube is welded at the round hole;
overlaying the grooves on the four sides of the composite blank base blank;
vacuumizing the composite blank through the seamless steel pipe by adopting a vacuum pump, wherein the vacuum degree is less than or equal to 10 -1 Pa, and then maintaining the pressure for more than 4 hours; and finally, sealing the seamless steel tube.
4. The method for hot continuous rolling of a single-sided stainless steel composite sheet according to claim 3, wherein the step of "subjecting at least one surface of each of the two base materials and the two composite materials to a surface treatment" comprises:
polishing one surface of each composite material to remove surface oxide skin; the method comprises the steps of,
And milling one surface of the two substrates in a manner of complementarily forming, wherein the surface is processed into a transverse inclined surface with the length of L11=L1 and the width of W11 & gtW 1, the substrate is a non-uniform thick blank with the thickness gradually changing in the transverse direction, or the surface is processed into a longitudinal inclined surface with the length of L11 & gtL 1 and the width of W11 & gtW 1, and the substrate is a non-uniform thick blank with the thickness gradually changing in the longitudinal direction.
5. The hot continuous rolling preparation method of the single-sided stainless steel composite plate according to claim 4, wherein L2=L11-L0, W2=W11-W0, and the values of L0 and W0 are respectively 90-150 mm;
in the process of centering the composite material relative to the base material, the distance from the lateral side of the composite material to the corresponding side of the base material is half of W0, and the distance from the longitudinal side of the composite material to the corresponding side of the base material is half of L0.
6. The method for hot continuous rolling of a single-sided stainless steel composite sheet according to claim 3, wherein the step of "subjecting at least one surface of each of the two base materials and the two composite materials to a surface treatment" comprises:
milling one surface of two base materials in a mode of complementation of relative shapes, processing the surface into irregular concave-convex surfaces comprising n planes which are sequentially connected in the transverse direction, wherein the base materials are non-uniform thickness blanks with non-monotonic thickness changes in the transverse direction, the length L12=L1 of the irregular concave-convex surfaces and the total width W12 is larger than W1; or, processing the surface into an irregular concave-convex surface comprising n planes which are sequentially connected along the longitudinal direction, wherein the base material is a non-uniform thickness blank with non-monotonic thickness change along the longitudinal direction, the total length L12 of the irregular concave-convex surface is more than L1, and the width W12=W1; n is more than or equal to 2;
Polishing one surface of each composite material to remove surface oxide skin; and then each composite material is bent to be matched with the corresponding irregular concave-convex surface.
7. The hot continuous rolling preparation method of the single-sided stainless steel composite plate according to claim 6, wherein l2=l12-l0, w2=w12-w0, and the values of L0 and W0 are respectively 90-150 mm;
in the process of centering the composite material relative to the base material, the distance from the lateral side of the composite material to the corresponding side of the base material is half of W0, and the distance from the longitudinal side of the composite material to the corresponding side of the base material is half of L0.
8. The method for preparing a single-sided stainless steel composite plate by hot continuous rolling according to claim 3, wherein in the step of brushing a release agent on one surface of a composite material, the release agent is a coating solution containing silicon oxide and magnesium oxide, wherein the mass ratio of the silicon oxide to the magnesium oxide is 3:1;
the amount of the release agent applied was 20ymg/m 2 Y is the thickness ratio of the composite blank to the composite board.
9. The hot continuous rolling preparation method of the single-sided stainless steel composite plate according to claim 3, wherein in the step of brushing a release agent on one surface of a composite material, the release agent comprises the following components in parts by weight: 25-35% of silicon nitride, 5-10% of thermosetting amino resin and 55-70% of water;
The thickness of the coated release agent is 0.2-0.5 mm.
10. The method for preparing the single-sided stainless steel composite plate by hot continuous rolling according to claim 3, wherein in the step of performing gas shielded welding between adjacent seals and between the seals and the base material, the welding speed is 300-360 mm/min, and the temperature between the seals is controlled to be 135-165 ℃ in the welding process.
11. The method for preparing the single-sided stainless steel composite plate by hot continuous rolling according to claim 3, wherein in the step of overlaying the grooves on the four sides of the composite blank base, submerged arc overlaying is adopted;
before welding, baking the welding flux for 2 hours at 350 ℃, and then preserving heat for 1 hour at 150 ℃;
in the welding process, the temperature between the channels is controlled to be 135-165 ℃, and the welding speed is 420-480 mm/min.
12. A single-sided stainless steel composite board, characterized in that the single-sided stainless steel composite board is prepared by the preparation method of any one of claims 1 to 11;
the total thickness of the composite board is less than or equal to 10mm, the thickness of the composite layer is more than or equal to 0.2mm, and the unevenness is less than or equal to 3mm/m;
the bonding rate of the composite interface is 100%, and the shearing strength is more than or equal to 210MPa;
the yield strength is more than or equal to 235MPa, and the tensile strength is more than or equal to 400MPa.
13. The single-sided stainless steel composite plate according to claim 12, wherein the yield strength is not less than 355MPa, the tensile strength is not less than 450MPa, and the shear strength is not less than 210MPa.
14. The single-sided stainless steel composite plate according to claim 12, wherein the yield strength is not less than 420MPa, the tensile strength is not less than 520MPa, and the shear strength is not less than 300MPa.
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