CN111349769A - Corrosion-inhibiting steel for aluminum-clad substrate and manufacturing method thereof - Google Patents
Corrosion-inhibiting steel for aluminum-clad substrate and manufacturing method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
Abstract
The invention discloses corrosion-inhibiting steel for an aluminum-coated substrate, which comprises the following chemical elements in percentage by mass: c is more than 0 and less than or equal to 0.01 percent, Si is more than 0 and less than or equal to 0.005 percent, Mn: 0.08-0.2%, P: 0.018-0.03%, Al is less than or equal to 0.005%, Cu: 0.04-0.1%, Cr: 0.1-0.25%, N: 0.0040 to 0.010% and Ti: 0.01-0.035%, O: 0.02-0.050%, and the balance of Fe and other inevitable impurities. The invention also discloses a method for manufacturing the corrosion-inhibiting steel for the aluminum-clad substrate, which comprises the following steps: (1) smelting and casting; (2) reheating: the casting blank is reheated to 1180-1250 ℃; (3) rough rolling; (4) fine rolling; (5) coiling; (6) and cooling to room temperature. The steel for the aluminum-clad substrate has good mechanical property, high strength and good plasticity, and inhibits corrosion.
Description
Technical Field
The present invention relates to a steel for a substrate and a method for manufacturing the same, and more particularly, to a steel for an aluminum-clad substrate and a method for manufacturing the same.
Background
With the development of technology and economy, the performance requirements on metal materials are higher and higher, and the metal materials with single composition are often difficult to meet the requirements of multi-aspect performance in the actual use process. The composite board is made of two or more metal materials by various different processes, and can meet the special comprehensive performance requirements. The aluminum-clad steel is a composite plate strip which is formed by cladding an aluminum film on the surface of strip steel by rolling at room temperature to form a surface of aluminum and a core layer of steel, has the strength of the existing steel, has the characteristics of good heat dissipation, corrosion resistance, light weight and attractive appearance of the aluminum, particularly greatly reduces the cost, and is widely applied to the fields of household electrical panels, heat dissipation parts, decoration and the like.
The substrate used for producing the aluminum-clad steel strip is deformed together with the aluminum film on the surface in the production process of the composite strip, so that the substrate is required to have strength and plasticity equivalent to that of aluminum, and therefore, the substrate is generally low in strength and excellent in plasticity. However, the aluminum-clad substrate also requires good steel-aluminum lamination performance, and the low yield strength steel in the general sense is difficult to be used for aluminum-clad steel production.
Chinese patent publication No. CN102019727A, published as 2011, 4/20/entitled "aluminum-coated steel strip for cooler, method for producing same, and steel strip and aluminum alloy strip used for same" discloses an aluminum-coated steel strip, method for producing same, and steel strip and aluminum alloy strip used for same. The technical proposal disclosed in the Chinese patent document relates to the used substrate, but the technical proposal is mainly used for producing thicker aluminum-coated strip steel, has insufficient plastic deformation capability and is difficult to meet the requirement of large deformation.
Chinese patent publication No. CN101525720, published as 2009, 9.9.9, entitled "a novel special base steel strip for producing an aluminum-coated steel strip" discloses a novel special base steel strip for producing an aluminum-coated steel strip. In the technical scheme disclosed in the Chinese patent document, the related steel is a high alloy component, wherein the content of Mn is 15-30%.
Chinese patent publication No. CN107881427A, published as 2018, 4, 6, and entitled "a low yield strength aluminum-clad substrate with excellent plasticity" discloses a low yield strength aluminum-clad substrate having good steel-aluminum-steel-aluminum bonding performance. However, in use, the problem of corrosion of the steel-aluminum section after the steel and the aluminum are combined due to the potential difference of the steel and the aluminum is found, which is a common problem faced by the current dissimilar metal composite materials.
Therefore, the steel related in the prior art does not have steel-aluminum bonding performance on one hand, and only has strength plasticity equivalent to that of Al; on the other hand, in the prior art relating to the aluminum-coated substrate, the problem of corrosion of the section of the steel and the aluminum generally exists, and the use of the aluminum-coated strip steel is influenced.
Disclosure of Invention
The invention aims to provide corrosion-inhibiting steel for an aluminum-clad substrate, which adopts an extremely low C-Si component system and is added with a proper amount of corrosion-resisting elements such as P, Cu and Cr, so that the weather resistance index I is controlled to be 1.0-3.0, and further the aluminum-clad substrate with the corrosion-inhibiting function is obtained on the premise of ensuring the bonding performance of steel and aluminum, the corrosion problem of the aluminum section of the aluminum-clad steel is solved, and meanwhile, the steel plate has proper strength and good plasticity. In addition, the steel for the aluminum-clad substrate adopts P as a beneficial element and is controlled, so that the production difficulty is obviously reduced, and the production efficiency is improved.
In order to achieve the purpose, the invention provides corrosion-inhibiting steel for an aluminum-coated substrate, which comprises the following chemical elements in percentage by mass:
c is more than 0 and less than or equal to 0.01 percent, Si is more than 0 and less than or equal to 0.005 percent, Mn: 0.08-0.2%, P: 0.018-0.03%, Al is less than or equal to 0.005%, Cu: 0.04-0.1%, Cr: 0.1-0.25%, N: 0.0040 to 0.010% and Ti: 0.01-0.035%, O: 0.02-0.050%, and the balance of Fe and other inevitable impurities.
In the corrosion-inhibiting steel for the aluminum-clad substrate, the low C-Si-Mn design with the components similar to pure iron is adopted, and a proper amount of P and Ti are added, because the control of the components of the steel for the aluminum-clad substrate on the steel is very strict, particularly the addition amount of certain alloy components is required to be limited in order to ensure good steel-aluminum interface bonding performance, and meanwhile, the conventional alloy components have definite control requirements, which are obviously different from common steel types, the inventor designs the mass percentage ratio of the chemical elements through a large number of experimental researches and analyses, and the design principle of each chemical element is as follows:
c: in the steel for an aluminum-clad substrate according to the present invention, C increases the yield strength of the steel sheet by solid solution strengthening, and decreases the elongation. The content of C should be reduced as much as possible according to the actual steel making process, so the mass percent of C in the steel for inhibiting the corrosion of the aluminum-clad base plate is controlled to be more than 0 and less than or equal to 0.01, wherein the mass percent of C is preferably 0.002-0.008%.
Si: in the technical scheme of the invention, Si is a deoxidizing element and is also a solid solution strengthening element, and the addition of Si can increase the yield strength and reduce the elongation of the steel plate, and Si exceeding the upper limit of the content of the scheme can deteriorate the steel-aluminum interface composite performance, so that the mass percent of Si in the corrosion-inhibiting steel for the aluminum-clad substrate is controlled to be more than 0 and less than or equal to 0.005 percent.
Mn: mn is an essential element for steelmaking deoxidation, and can simultaneously expand an austenite region, reduce the transformation temperature of super-cooled austenite, promote the transformation of medium and low temperature structures and refine the microstructure of steel, so that Mn is an important strengthening and toughening element. However, in the steel type according to the present invention, the addition of Mn exceeding the upper limit of the content causes segregation of the steel type, deteriorates the matrix structure, and forms large MnS inclusions, thereby deteriorating the weldability and the weld heat affected zone toughness of the steel sheet. In addition, for the technical scheme of the invention, the cost is increased correspondingly by adding excessive Mn. Therefore, in the corrosion-inhibited steel for an aluminum-clad substrate according to the present invention, the mass percentage of Mn is controlled to 0.08 to 0.2%.
P: p is likely to segregate at grain boundaries, and the bonding energy of the grain boundaries is reduced, so that the steel sheet becomes brittle. The P is added into the free-cutting steel, so that the chips can be prevented from sticking on the cutter, and the service life of the cutter is prolonged. In the steel system of the technical scheme, the fifth group element in the periodic table of the elements of P and N is found to have the property similar to that of N, and the steel of the technical scheme can inhibit the diffusion of Al, so that the steel particularly plays a role in making a brittle steel-aluminum compound layer difficult to form on a steel-aluminum interface, thereby obviously improving the steel-aluminum bonding performance and playing an important role in realizing the technical effect of the scheme. On the other hand, however, in the present invention, P exceeding the upper limit of the content is disadvantageous in the toughness and elongation of the steel grade of the present invention, and therefore, in the steel for aluminum-clad substrate coated with corrosion inhibition according to the present invention, the mass percentage of P is controlled to 0.018 to 0.03%, and preferably, the mass percentage of P may be further controlled to 0.018 to 0.024%.
Al: in the corrosion-inhibited steel for an aluminum-clad substrate according to the present invention, Al is an element necessary for deoxidation and also increases the strength of the steel, but Al having a high content is likely to diffuse into the steel-aluminum bonding interface and deteriorates the interface bonding strength. Therefore, in the technical scheme of the invention, the mass percent of Al is required to be controlled so as to avoid influencing the combination property of steel and aluminum, and the mass percent of Al in the corrosion-inhibiting steel for the aluminum-clad substrate is controlled to be less than or equal to 0.005 percent.
Cu: since Cu has a solid solution strengthening effect, the addition of Cu according to the present invention can temper at an appropriate temperature to have a secondary hardening effect, thereby improving the strength of the steel grade according to the present invention. In the aspect of the present invention, Cu is also one of the elements that improve the corrosion resistance of the steel type according to the present invention, because the electrochemical potential of Cu is higher than that of Fe, Cu can promote the densification of the rust layer on the steel surface and also play a role in stabilizing the formation of the rust layer, but Cu exceeding the upper limit of the content of the present invention is not favorable for welding and is likely to cause web cracking during hot rolling, and therefore, the mass percentage of Cu is controlled to 0.04 to 0.10% in the steel for corrosion-inhibited aluminum-clad substrate according to the present invention.
Cr: for the technical solution of the present invention, Cr is a corrosion resistant element. The addition of Cr can remarkably improve the self-corrosion potential of the steel grade related to the invention and inhibit the occurrence of corrosion. In addition, Cr may form a continuous solid solution with Fe in steel, thereby playing a role of a solid solution strengthening effect. In addition, Cr can form various types of carbides with C, such as M3C、M7C3And M23C6And the secondary strengthening effect is generated, so that the performance of the steel grade related to the invention is improved. On the other hand, however, Cr exceeding the upper limit of the content of the present case is disadvantageous in welding and toughness and also increases productivity change, and therefore, the mass percentage of Cr is controlled to be between 0.1 and 0.25% in the steel for a corrosion-inhibited aluminum-clad substrate according to the present invention.
N: in the corrosion-inhibited steel for an aluminum-clad substrate according to the present invention, N can form AlN particles with Al in the steel, thereby inhibiting diffusion of Al to the interface, but a high N solid solution content can significantly improve the strength of the steel and is disadvantageous to plasticity. Therefore, in the corrosion-inhibited steel for an aluminum-clad substrate according to the present invention, the mass percentage of N is controlled to 0.0040 to 0.01%, and preferably, the mass percentage of N may be further controlled to 0.004 to 0.008%.
Ti: in the steel for an aluminum-clad substrate according to the present invention, Ti was used to fix C, N atoms to reduce its effect of inhibiting dislocation movement. Ti is a strong ferrite-forming element and a carbonitride-forming element. In the steel type according to the invention, a suitable amount of nitrogen and titanium form titanium nitride, the formation temperature of which is above 1400 ℃, and which precipitates in a high temperature liquid phase or delta ferrite, wherein Ti is present4C2S2The precipitation is started at the temperature of 1260 ℃,TiC is precipitated at 1050 ℃, and the fine precipitates can be nailed to a grain boundary, so that austenite grains are refined, grains in a welding heat affected zone are prevented from growing, and the welding performance of the steel plate of the steel grade related by the invention is improved. In addition, in the technical scheme of the invention, Ti can be preferentially combined with N in the scheme, so that the quantity of AlN in the steel is reduced, and the steel grade related to the invention is improved. However, Ti exceeding the upper limit of the present invention coarsens particles of TiC, TiN, etc., and further loses the grain boundary pinning effect, increases the grain size, and reduces the grain boundary strengthening effect, thereby reducing the elongation of the steel sheet of the steel grade related to the present invention. Therefore, in the corrosion-inhibited steel for an aluminum-clad substrate according to the present invention, the mass percentage of Ti is limited to 0.01 to 0.035%. In some preferred embodiments, it is further defined that N, Ti satisfies the relationship 2.5 Ti/N5.0 by mass percent.
O: in the steel for an aluminum-clad substrate according to the present invention, the contents of Si and Al are limited to extremely low ranges in the aspect of the present invention, and therefore, the oxygen content in the steel is inevitably high. However, the oxygen element can suppress adverse effects of the Al element in the steel on the interface bonding of steel and aluminum, but at the same time, considering that an excessively high content of oxygen tends to form non-metallic inclusions, which are detrimental to the fatigue properties and toughness of the steel sheet, the mass percentage of O is limited to 0.02 to 0.050% and preferably 0.02 to 0.04% in the corrosion-inhibited steel for an aluminum-clad substrate according to the present invention. In some preferred embodiments, O, Al and Si may be further defined to satisfy O/(0.9Al +1.2Si) ≧ 3.0.
In conclusion, according to the technical scheme of the invention, the P, Cu and Cr are matched, particularly, P is added as a beneficial element in the scheme, so that the production difficulty is reduced, the production process is simplified, the production efficiency is improved, the weather resistance index I can be controlled to be 1.0-3.0 by adding a proper amount of Cu and Cr, the inhibition of the corrosion of the steel-aluminum section is realized, the steel for the aluminum-coated substrate with the function of inhibiting the corrosion of the steel-aluminum section is obtained, and the problem of the section corrosion commonly existing in the dissimilar metal composite material in the prior art is solved.
Further, the corrosion-inhibiting steel for an aluminum-clad substrate according to the present invention has a function of inhibiting corrosion of a steel aluminum cross section. The corrosion inhibition has two ways, one is to form a compact protective rust layer on the surface of the material to realize physical barrier and prevent the corrosion from penetrating into the substrate; another is to increase the self-etching potential of the material, thereby reducing the tendency to etch. The technical scheme of the invention adopts the latter mode to realize the inhibition of the corrosion of the steel-aluminum section. In addition, since the substrate for aluminum cladding must ensure proper steel-aluminum bonding performance, and therefore, the selection of corrosion-resistant elements must ensure that the interface bonding performance of steel and aluminum is not affected, the inventors have found that the addition of Cu and Cr in the amounts defined in the present application can play a role of being solid-dissolved in steel and hindering the diffusion of Al, and does not promote the formation of iron-aluminum compounds at the steel-aluminum interface, thereby having no adverse effect on the steel-aluminum bonding performance. However, if the content exceeds the content defined in the present application, Cu and Cr promote the formation of a surface protective rust layer, which affects the appearance quality of the aluminum-clad material and adversely affects the steel-aluminum bonding performance.
In addition, in the present case, the corrosion mainly occurs at the edge of the aluminum-clad material, i.e., the cross-sectional position, rather than the entire steel-aluminum interface.
Further, the corrosion-inhibited steel for an aluminum-clad substrate according to the present invention satisfies the following requirements: 2.5 or more Ti/N or less than 5.0, and O/(0.9Al +1.2Si) or more than 3.0.
In the above formulas, Ti, N, O, Al, and Si each represent a mass percentage thereof, and the numerical value assigned to the above formula is a numerical value before the percentile, for example, when the mass percentage of Ti is 0.021% and the mass percentage of N is 0.0065%, the formula Ti/N is 0.021/0.0065 is 3.23.
Further, in the corrosion-inhibited steel for an aluminum-clad substrate according to the present invention, the chemical elements also satisfy at least one of the following contents by mass:
C：0.002-0.008％，P：0.018-0.024％，N：0.004-0.008％，O：0.02-0.04％。
further, in the corrosion-inhibited steel for an aluminum-clad substrate according to the present invention, among other inevitable impurities: s is less than or equal to 0.005 percent.
Further, in the steel for an aluminum-clad substrate for suppressing corrosion according to the present invention, the matrix is equiaxed ferrite, and the ferrite grain size is 10 to 50 μm.
Furthermore, in the corrosion-inhibiting steel for the aluminum-clad substrate, the yield strength is 160-240MPa, the tensile strength is more than or equal to 280MPa, the elongation is more than or equal to 40 percent, and the weather resistance index I is 1.0-3.0.
It should be noted that the weathering steel has good weather resistance by adding corrosion resistant elements, and is generally called weathering steel with weather resistance index above 6.0, wherein weather resistance index I is defined as follows:
I＝26.01Cu+3.88Ni+1.2Cr+1.49Si+17.28P-7.29CuNi-9.1NiP-33.39Cu2
since the calculation of the weathering index I should be known to those skilled in the art, it is not described in detail herein.
With respect to the prior art, the corrosion resistance of weathering steels results on the one hand from the increasing effect of the alloying elements on the corrosion potential and on the other hand from the formation of a protective rust layer on the material surface. The formation of a protective rust layer is not suitable for the steel for an aluminum-clad substrate according to the present invention, and therefore, the formation of such a rust layer must be avoided, and thus, the weather resistance index I is controlled to be in the range of 1.0 to 3.0.
Accordingly, another object of the present invention is to provide a method for manufacturing the above-mentioned corrosion-inhibiting steel for aluminum-clad base plate, which uses high-temperature hot rolling, has a simple production process and a low production cost, and the obtained steel for aluminum-clad base plate has low yield strength, good plasticity and good steel-aluminum lamination performance.
In order to achieve the above object, the present invention provides a method for producing the above corrosion-inhibited steel for an aluminum-clad substrate, comprising the steps of:
(1) smelting and casting;
(2) reheating: the casting blank is reheated to 1180-1250 ℃;
(3) rough rolling;
(4) fine rolling;
(5) coiling;
(6) and cooling to room temperature.
In the manufacturing method, the solid solution effect of the alloy elements in the casting blank is comprehensively considered, so that the casting blank is controlled to be reheated at 1180-1250 ℃. Followed by rough rolling, finish rolling, coiling and cooling to obtain the desired steel sheet. Because the steel for the aluminum-coated substrate is ultra-low carbon steel and the addition amount of alloy elements is small, the substrate of the steel is a typical equiaxial ferrite structure, and the grain size of the ferrite is 10-50 microns.
Further, in order to obtain the required performance, in the manufacturing method of the invention, in the step (3), the accumulated deformation amount in the rough rolling stage is more than or equal to 80%, and the rough rolling finishing temperature is 950-.
Further, in the manufacturing method of the present invention, in the step (4), the finish rolling temperature of the finish rolling is controlled to 840-920 ℃.
Further, in the manufacturing method of the present invention, in the step (5), the finish-rolled steel sheet is water-cooled to 580-640 ℃ and coiled.
Compared with the prior art, the corrosion-inhibiting steel for the aluminum-clad substrate and the manufacturing method thereof have the following advantages and beneficial effects:
the corrosion-inhibiting steel for the aluminum-clad substrate has excellent comprehensive mechanical properties, the yield strength is 160-240MPa, the tensile strength is more than or equal to 280MPa, and the elongation rate is more than 40%.
In addition, the corrosion-inhibiting steel for the aluminum-clad substrate has excellent steel-aluminum interface bonding performance, and the thickness of a compound layer of the steel for the aluminum-clad substrate after aluminum cladding is less than or equal to 5 microns, and can even be completely eliminated in some preferred embodiments, so that the corrosion-inhibiting steel for the aluminum-clad substrate has a clean steel-aluminum interface and is very suitable for producing aluminum-clad strip steel.
In addition, the corrosion-inhibited steel for the aluminum-clad substrate has excellent plastic deformation capacity, can meet the requirement of single-pass large deformation in the aluminum-clad rolling process, does not need annealing in the middle, reduces the production procedures and improves the production efficiency.
Besides the advantages and beneficial effects, the manufacturing method provided by the invention has the advantages that the manufacturing method is simple in production process and low in cost, and is very suitable for large-scale production of enterprises due to the fact that high-temperature hot rolling is adopted.
Drawings
FIG. 1 shows the microstructure of the corrosion-inhibiting steel for an aluminum-clad substrate of example 1.
Detailed Description
The corrosion-inhibiting steel for an aluminum-clad substrate and the method for producing the same according to the present invention will be further explained and explained with reference to the following specific examples and drawings attached to the specification, but the explanation and explanation do not unduly limit the technical aspects of the present invention.
Examples 1 to 8
Table 1 shows the mass percentages (wt%) of the respective chemical elements in the corrosion-inhibiting steels for aluminum-clad substrates of examples 1 to 8.
TABLE 1 (wt%, balance Fe and unavoidable impurity elements other than S)
As can be seen from Table 1, in comparison with the prior art, the mass percentages of Si and Al in the examples are below 0.005%, the mass percentage of O is between 0.02 and 0.05%, and the mass percentage of N is between 0.0040 and 0.010%. In addition, P is added as a favorable element, so that the mass percent of P is controlled to be 0.018-0.03%.
The method of making the corrosion-inhibiting steel for aluminum-clad substrates of examples 1-8 was prepared by the following steps:
(1) smelting and casting: according to the chemical element components shown in Table 1, the casting blank is obtained by smelting on a 500kg vacuum induction furnace and casting.
(2) Reheating: the cast slab is reheated to 1180 ℃ -1250 ℃.
(3) Rough rolling: the accumulated deformation in the rough rolling stage is more than or equal to 80 percent, and the rough rolling finishing temperature is 950-.
(4) Finish rolling: the finish rolling temperature of the finish rolling is controlled to be 840-920 ℃.
(5) Coiling: and (3) cooling the steel plate after the finish rolling to 580-640 ℃ by water, and coiling.
(6) And cooling to room temperature.
In step (5), the cooling method for coiling may be air cooling other than water cooling, for example, when the steel for aluminum-clad substrate is thin, such as less than or equal to 3.0mm, the steel for aluminum-clad substrate may be cooled to a desired coiling temperature before entering the coiler, and the performance may be satisfied.
Table 2 lists the specific process parameters involved in the method of making the corrosion inhibiting steel for aluminum-clad substrates of examples 1-8.
Table 2.
The corrosion-inhibiting aluminum-clad substrate steels of examples 1-8 were subjected to various tests and the results are shown in Table 3.
Table 3.
As can be seen from Table 3, the steel for the aluminum-clad substrate in each example of the present application has stable yield strength, the yield strength of the steel plates of various specifications is between 160 and 240MPa, the tensile strength is not less than 280MPa, and the steel has high elongation (the elongation is not less than 40%) and high performance of inhibiting corrosion of the aluminum section of the steel under different rolling processes.
Furthermore, it can be seen from Table 3 that the corrosion-inhibiting steel for aluminum-clad substrates of the examples of this document has excellent steel-aluminum interface bonding properties, and the thickness of the aluminum-clad steel for aluminum-clad substrates is 5 μm or less at the steel-aluminum interface compound layer, while in some other preferred embodiments, the thickness of the steel-aluminum interface compound layer may even be completely absent.
FIG. 1 shows the microstructure of the corrosion-inhibiting steel for an aluminum-clad substrate of example 1. As shown in fig. 1, the matrix of the steel for an aluminum-clad substrate of example 1 was equiaxed ferrite, and the ferrite grain size was 10 to 50 μm.
As can be seen from tables 1 to 3 and fig. 1, the steel for the aluminum-clad substrate in each embodiment of the present invention adopts an extremely low C — Si — Mn design, supplemented with a small amount of Ti, N, O and a proper amount of P, and the obtained steel for the aluminum-clad substrate satisfies the requirements of the aluminum-clad substrate of high elongation, good steel-aluminum combination property and strong deformability.
Compared with the prior art, the corrosion-inhibiting steel for the aluminum-clad substrate and the manufacturing method thereof have the following advantages and beneficial effects:
the corrosion-inhibiting steel for the aluminum-clad substrate has excellent comprehensive mechanical properties, the yield strength is 160-240MPa, the tensile strength is more than or equal to 280MPa, and the elongation rate is more than 40%.
In addition, the corrosion-inhibiting steel for the aluminum-clad substrate has excellent steel-aluminum interface bonding performance, and the thickness of a compound layer of the aluminum-clad steel for the aluminum-clad substrate is less than or equal to 5 microns or even can be completely eliminated, so that the corrosion-inhibiting steel for the aluminum-clad substrate has a clean steel-aluminum interface and is very suitable for producing aluminum-clad strip steel.
In addition, the steel for inhibiting corrosion for the aluminum-clad substrate adds P as a beneficial element, and controls the mass percent of the P to be 0.018-0.03%, thereby reducing the production difficulty, simplifying the production process and improving the production efficiency.
Furthermore, the corrosion-inhibiting steel for the aluminum-clad substrate controls the weather-resistant index I to be 1.0-3.0 by adding a proper amount of Cu and Cr, thereby realizing the inhibition of the corrosion of the aluminum-clad section of the steel.
In addition, the corrosion-inhibited steel for the aluminum-clad substrate has excellent plastic deformation capacity, can meet the requirement of single-pass large deformation in the aluminum-clad rolling process, does not need annealing in the middle, reduces the production procedures and improves the production efficiency.
Besides the advantages and beneficial effects, the manufacturing method provided by the invention has the advantages that the manufacturing method is simple in production process and low in cost, and is very suitable for large-scale production of enterprises due to the fact that high-temperature hot rolling is adopted.
It should be noted that the prior art in the protection scope of the present invention is not limited to the examples given in the present application, and all the prior art which is not inconsistent with the technical scheme of the present invention, including but not limited to the prior patent documents, the prior publications and the like, can be included in the protection scope of the present invention.
In addition, the combination of the features in the present application is not limited to the combination described in the claims of the present application or the combination described in the embodiments, and all the features described in the present application may be freely combined or combined in any manner unless contradictory to each other.
It should also be noted that the above-mentioned embodiments are only specific embodiments of the present invention. It is apparent that the present invention is not limited to the above embodiments and similar changes or modifications can be easily made by those skilled in the art from the disclosure of the present invention and shall fall within the scope of the present invention.
Claims (10)
1. The steel for the aluminum-coated substrate for inhibiting corrosion is characterized by comprising the following chemical elements in percentage by mass:
c is more than 0 and less than or equal to 0.01 percent, Si is more than 0 and less than or equal to 0.005 percent, Mn: 0.08-0.2%, P: 0.018-0.03%, Al is less than or equal to 0.005%, Cu: 0.04-0.1%, Cr: 0.1-0.25%, N: 0.0040 to 0.010% and Ti: 0.01-0.035%, O: 0.02-0.050%, and the balance of Fe and other inevitable impurities.
2. The corrosion-inhibited steel for aluminum-clad substrates according to claim 1, further satisfying: 2.5 or more Ti/N or less than 5.0, and O/(0.9Al +1.2Si) or more than 3.0.
3. The corrosion-inhibited steel for aluminum-clad substrate according to claim 1, wherein each chemical element further satisfies at least one of the following contents by mass:
C：0.002-0.008％，P：0.018-0.024％，N：0.004-0.008％，O：0.02-0.04％。
4. the corrosion-inhibited steel for aluminum-clad substrates according to claim 1, wherein among other unavoidable impurities: s is less than or equal to 0.005 percent.
5. The corrosion inhibited steel for aluminum-clad substrate according to claim 1, wherein the matrix is equiaxed ferrite and the ferrite grain size is 10 to 50 μm.
6. The corrosion-inhibited steel for aluminum-clad substrate according to any one of claims 1 to 5, wherein the yield strength is 160-240MPa, the tensile strength is 280MPa or more, the elongation is 40% or more, and the weather resistance index I is 1.0 to 3.0.
7. The method for producing a corrosion-inhibited steel for an aluminum-clad substrate according to any one of claims 1 to 6, comprising the steps of:
(1) smelting and casting;
(2) reheating: the casting blank is reheated to 1180-1250 ℃;
(3) rough rolling;
(4) fine rolling;
(5) coiling;
(6) and cooling to room temperature.
8. The manufacturing method as claimed in claim 7, wherein in the step (3), the accumulated deformation amount in the rough rolling stage is not less than 80%, and the finish temperature of the rough rolling is in the range of 950 ℃ and 1150 ℃.
9. The manufacturing method as set forth in claim 7, wherein in the step (4), the finish rolling temperature of the finish rolling is controlled to 840-920 ℃.
10. The manufacturing method according to claim 7, wherein in the step (5), the finish-rolled steel sheet is water-cooled to 580-640 ℃ and coiled.
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| CN114250411A (en) * | 2020-09-25 | 2022-03-29 | 宝山钢铁股份有限公司 | Steel for aluminum-coated plate with base plate for kitchen ware and production method thereof |
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