CN109435362B - Anti-corrosion cold-rolled steel plate and manufacturing method thereof - Google Patents
Anti-corrosion cold-rolled steel plate and manufacturing method thereof Download PDFInfo
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- 238000005260 corrosion Methods 0.000 title claims abstract description 73
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 239000010960 cold rolled steel Substances 0.000 title claims description 45
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 118
- 239000010959 steel Substances 0.000 claims abstract description 118
- 239000011572 manganese Substances 0.000 claims abstract description 108
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 99
- 239000000956 alloy Substances 0.000 claims abstract description 99
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 64
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 64
- 239000011651 chromium Substances 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 25
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 19
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 17
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 15
- 230000007797 corrosion Effects 0.000 claims description 46
- 239000013078 crystal Substances 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000004381 surface treatment Methods 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 claims description 6
- 238000005275 alloying Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 claims description 3
- 238000005097 cold rolling Methods 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910052745 lead Inorganic materials 0.000 claims 2
- 229910052718 tin Inorganic materials 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 10
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- 239000010703 silicon Substances 0.000 description 4
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- 238000006243 chemical reaction Methods 0.000 description 3
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- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- -1 chlorine ions Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
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- 238000005494 tarnishing Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
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- Engineering & Computer Science (AREA)
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- Heat Treatment Of Sheet Steel (AREA)
Abstract
The embodiment of the invention provides an anti-rust cold rollingA steel sheet and a method for manufacturing the same, comprising: the alloy layer covers the surface of the steel plate body; the alloy layer has a thickness of 0.5 (Mn) or moreeq)0.5Micron, the standard electrode potential range of the alloy layer is-0.8V-0V, the manganese equivalent of the steel plate body is 1% -6%, and the manganese equivalent is based on Mneq10 + Mn% +0.5 × Cr%, wherein Mn is presenteqThe content of C% is the carbon content in the steel plate body, the content of Mn% is the manganese content in the steel plate body, and the content of Cr% is the chromium content in the steel plate body. The invention achieves good anti-corrosion effect without influencing the physical performance of the steel plate body and increasing the amount of subsequent use programs.
Description
Technical Field
The invention relates to the technical field of metal materials, in particular to an anti-corrosion cold-rolled steel plate and a manufacturing method thereof.
Background
The cold-rolled high-strength steel plate is widely used for automobile body production. In order to obtain good strength and toughness, cold-rolled high-strength steel plates generally contain more alloy elements, such as carbon, manganese, silicon, aluminum, chromium and the like. The high-strength steel plate has high alloy element content, so that the corrosion resistance of the cold-rolled high-strength steel plate in the atmosphere is obviously reduced, and the surface of the cold-rolled high-strength steel plate is often rusted in transportation and storage and before vehicle body coating.
At present, a plurality of methods for solving the problem of corrosion on the surface of the cold-rolled high-strength steel plate are provided. For example, the surface of a cold-rolled high-strength steel plate can be coated with anti-rust oil which has good corrosion resistance, but the high-strength steel plate needs to be subjected to oil removal treatment before use, so that the processing procedures are increased. The corrosion resistance can also be realized by adding trace alloy elements, such as Ni, Cu and the like, into the cold-rolled high-strength steel plate, however, the trace alloy elements usually have adverse effects on the strength and the toughness. The packaging with good sealing performance can be used, so that the contact between the cold-rolled high-strength steel plate and the oxidizing atmosphere is reduced, but the scheme increases the packaging cost on one hand, and cannot completely avoid the direct contact between the cold-rolled high-strength steel plate and the air in the use process of the cold-rolled high-strength steel plate on the other hand. In summary, the anti-corrosion method in the prior art increases the subsequent storage and transportation, the used procedures and cost, and even influences the quality of the steel plate, so the invention is provided.
Disclosure of Invention
The invention aims to provide an anti-corrosion cold-rolled steel plate and a manufacturing method thereof, and the anti-corrosion cold-rolled steel plate can improve the anti-corrosion performance of a steel plate body and solve the corrosion problem of the cold-rolled steel plate under the condition of not increasing the subsequent processes and cost of storage, transportation and use.
The embodiment of the invention is realized by the following steps:
a corrosion resistant cold rolled steel sheet comprising: the alloy layer covers the surface of the steel plate body; the alloy layer has a thickness of 0.5X (Mn)eq)0.5Micron, the standard electrode potential range of the alloy layer is-0.8V-0V, the manganese equivalent of the steel plate body is 1% -6%, and the manganese equivalent is based on Mneq=10 × C% + Mn% +0.5 × Cr%, wherein Mn iseq% is manganese equivalent in the steel sheet body, C% is carbon content in the steel sheet body, Mn% is manganese content in the steel sheet body, and Cr% is chromium content in the steel sheet body.
Preferably, the manganese equivalent is 3% to 4%.
Preferably, the alloy layer has a thickness of 2.5 μm or less.
Preferably, the alloy layer is 2 microns thick.
Preferably, the spatial structure of the alloy layer is: columnar structure, layered structure, single crystal structure, or equiaxed crystal structure.
A method for manufacturing a rust-resistant cold-rolled steel sheet, the method being used for manufacturing the above-mentioned rust-resistant cold-rolled steel sheet, the method comprising: smelting a steel billet, and controlling the content of alloy elements in the steel billet; heating, rough rolling, finish rolling, cooling and cold rolling the steel billet in sequence to obtain a steel plate body; sequentially carrying out surface treatment, heat treatment and coiling on the steel plate body to obtain the anti-corrosion cold-rolled steel plate; controlling the content of alloy elements in the steel billet to enable the manganese equivalent of the steel plate body to be 1% -6%, wherein the manganese equivalent is determined according to Mneq=10 × C% + Mn% +0.5 × Cr%, wherein Mn iseq% is manganese equivalent in the steel sheet body, C% is carbon content in the steel sheet body, Mn% is manganese content in the steel sheet body, Cr% is chromium content in the steel sheet body; the surface treatment is to coat the surface of the steel plate body with a thickness of 0.5 x (Mn)eq)0.5Micron, and the standard electrode potential of the alloy layer is-0.8V-0V.
Preferably, the content of the alloy elements in the steel billet is controlled so that the manganese equivalent of the steel plate body is 3% -4%.
Preferably, the alloy layer has a thickness of 2.5 μm or less.
Preferably, the alloy layer has a thickness of 2 μm or less.
Preferably, the spatial structure of the alloy layer is: columnar structure, layered structure, single crystal structure, or equiaxed crystal structure.
Compared with the prior art, the anti-corrosion cold-rolled steel plate and the manufacturing method thereof provided by the embodiment of the invention comprise a steel plate body and an alloy layer covering the surface of the steel plate body, wherein the manganese equivalent of the steel plate body is determined according to the carbon content and the manganese content of the steel plate body, and the thickness of the set alloy layer is related to the manganese equivalent. Controlling the manganese equivalent to be 1-6%, and controlling the degree of the manganese equivalent which can directly react out of the steel plate body and can generate the galvanic cell reactionThe minimum thickness of the layer is determined in terms of manganese equivalents. While ensuring that the thickness of the alloy layer is greater than or equal to 0.5 x (Mn)eq)0.5And the standard electrode potential is in a range of-0.8V-0V, so that the steel plate body has a good anti-corrosion effect after being covered with the alloy layer. Therefore, the anti-rust cold-rolled steel plate has good anti-rust performance under the condition of not increasing the subsequent processes and cost of storage, transportation and use.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a corrosion principle of a corrosion-resistant cold-rolled steel sheet according to a first embodiment of the present invention.
Fig. 2 is a first structural schematic diagram of an anti-corrosion cold-rolled steel sheet according to a first embodiment of the present invention.
Fig. 3 is a second structural diagram of an anti-corrosion cold-rolled steel sheet according to a first embodiment of the present invention.
Fig. 4 is a third structural diagram of an anti-corrosion cold-rolled steel sheet according to the first embodiment of the present invention.
Fig. 5 is a fourth structural diagram of an anti-corrosion cold-rolled steel sheet according to a first embodiment of the present invention.
Fig. 6 is a surface treatment flowchart of a method for manufacturing a corrosion-resistant cold-rolled steel sheet according to a fourth embodiment of the present invention.
Icon: 10-corrosion resistant cold rolled steel sheet; 10 a-rust resistant cold rolled steel sheet; 10 b-corrosion resistant cold rolled steel sheet; 10 c-corrosion resistant cold rolled steel sheet; 10 d-corrosion resistant cold-rolled steel plate; an 11-alloy layer; 12-a steel plate body; 13-alloy element enrichment zone.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
In the existing cold-rolled high-strength steel, the alloy elements such as carbon, manganese, silicon, aluminum, chromium and the like are generally contained in a large amount. Among them, the content ranges of the more typical alloy elements are: 0.05-0.3% of carbon, 0.5-2.5% of manganese, 0.1-2% of silicon, 0.05-1% of aluminum and 0.05-0.5% of chromium. After the cold-rolled high-strength steel is subjected to heating and cooling heat treatment, the main microstructure comprises martensite, ferrite, austenite, bainite and the like. The above-mentioned alloying elements are accumulated on the surface of the cold-rolled high-strength steel in a large amount during the heat treatment process to form a selectively segregated alloying element-enriched zone 13, as shown in fig. 1. These surface-accumulated alloying elements are easy to form micro galvanic cells with the iron matrix in the atmospheric environment, so as to accelerate the corrosion rate of the steel, and the alloy layer 11 of the present invention can weaken or prevent galvanic cell reaction on the steel plate body 12. In addition, the carbon content has a large positive correlation effect on the corrosion of steel, and the invention finds that the more accurate corrosion relation can be obtained by comprehensively considering the alloy elements of carbon, manganese and chromium, and determines the reasonable thickness of the outer alloy layer 11.
First embodiment
Referring to fig. 2, 3, 4 and 5, a corrosion-resistant cold-rolled steel sheet 10 according to the present embodiment includes: the steel plate comprises a steel plate body 12 and an alloy layer 11, wherein the alloy layer 11 covers the surface of the steel plate body 12. The shape, size and other appearance parameters of the steel sheet in the present invention are not limited.
Preferably, the structure of the alloy layer 11 should be compact and should not be too loose, so as to prevent the corrosion resistance effect of the alloy layer 11 and the steel plate body 12 from being affected. The specific structure can be as follows: the corrosion-resistant cold-rolled steel sheet 10a having a columnar structure as shown in fig. 2, the corrosion-resistant cold-rolled steel sheet 10b having a layered structure as shown in fig. 3, the corrosion-resistant cold-rolled steel sheet 10c having a single crystal structure as shown in fig. 4, or the corrosion-resistant cold-rolled steel sheet 10d having an equiaxed crystal structure as shown in fig. 5.
Since carbon, manganese and chromium in the steel plate body 12 have a great influence on the corrosion speed, after the alloy layer 11 is coated on the surface of the steel plate body 12, the contents of the carbon, manganese and chromium in the steel plate body 12 and the corrosion speed are researched and determined by fitting, and when the thickness of the alloy layer 11 is greater than or equal to 0.5 × (Mn)eq)0.5Micron size of MneqIs manganese equivalent; the determination factor of the manganese equivalent in the steel plate body 12 includes the carbon content in the steel plate body 12, the manganese content in the steel plate body 12, and the chromium content in the steel plate body 12.
In this embodiment, according to the corrosion rate and the content of the alloy element, the calculation formula of the manganese equivalent obtained by fitting and calculating may be: mneq=10 × C% + Mn% +0.5 × Cr%, wherein Mn iseq% is manganese equivalent, C% is carbon content in the steel sheet body 12, Mn% is manganese content in the steel sheet body 12, and Cr% is chromium content in the steel sheet body 12. It should be noted that the weighting factors 10, 1, 0.5 allow reasonable calculation error (e.g., error within ± 0.1). In this embodiment, the alloy layer is formed by11, performing a corrosion test, wherein C is a columnar structure, L is a layered structure, S is a single crystal structure, and E is an isometric crystal structure, and the alloy layer 11 in this embodiment may adopt any one of the above structures. The corrosion resistance is evaluated by a wet and hot method, and the conditions of the wet and hot method are as follows: the temperature was 50 ℃ and the relative humidity was 90%. A48-hour moist heat test was conducted, and then the area where red rust occurred was visually evaluated, and if it exceeded 3%, it was obvious that rust was generated.
It can be seen from table 1 that the steel sheets of groups 1-14 have a significant anti-tarnishing effect compared to the steel sheet of group 15, and the manganese equivalent thereof is between 1% and 6%.
As can be seen from Table 1, the steel sheets of Nos. 1 to 11 are each larger than 0.5X (Mn) in view of the thickness of the alloy layer 11eq)0.5Micron, no matter the content of carbon and manganese independently or the content of manganese is changed in a conventional range (the content ranges of the conventional alloy elements are that the content of carbon is 0.05-0.3%, the content of manganese is 0.5-2.5%, the content of silicon is 0.1-2%, the content of aluminum is 0.05-1%, and the content of chromium is 0.05-0.5%), or the structure of the alloy layer 11 is changed, the corresponding corrosion area is less than or equal to 2% and not more than 3%, so that the alloy layer is not obvious in corrosion and has good anti-corrosion capability; in addition, in group 10, since 0.5X (Mn)eq)0.5=0.79 μm and the alloy layer 11 has a thickness of 0.8 μm, which is considered to be 0.5 × (Mn) in the group due to reasonable errors in measurement and calculationeq)0.5Equal to the thickness of the alloy layer 11 (i.e., with a tolerance of ± 0.01).
And the group No. 12-15, the thickness of the alloy layer 11 is less than 0.5 (Mn)eq)0.5Even if the alloy layer 11 is not arranged, the corrosion area of the steel plate reaches 20-90 percent, and the steel plate basically has no corrosion prevention capability.
Further, in the present embodiment, the alloy layer 11 covering the surface of the steel plate body 12 needs to have a certain thickness, and the thickness should generally have a positive correlation with the manganese equivalent. However, the thickness of the alloy layer 11 cannot be infinitely increased, otherwise, the mechanical properties and the service properties such as welding and coating of the vehicle body are affected, and the welding spot current window is reduced, the toughness is reduced, and the like. Generally, the elongation of the sample after the surface treatment (i.e., after covering the alloy layer 11) should not be reduced by more than 2%, otherwise the performance properties are significantly affected. The elongation percentage of the steel plate body 12 is measured to obtain:
it can be seen from table 2 that the thickness of the alloy layer 11 is in a positive correlation with the elongation and in an inverse correlation with the rusty area, and the elongation is 2% when the thickness of the alloy layer 11 is 2.5 μm (e.g., second). When the thickness of the alloy layer 11 exceeds 2.5 μm, for example, 3.5 μm in the group 12, the elongation reduction ratio is 3%, and the upper limit is exceeded by 2%, which significantly affects the later use of the steel sheet. It can thus be determined that 2.5 microns is the designed maximum for the alloy layer 11.
Further, it can be seen from table 2 that when the area of the rust is 0 and the percentage of reduction in elongation is less than 2%, the thickness of the alloy layer 11 is 2 micrometers and 2.3 micrometers, whereby 2 micrometers and 2.3 micrometers can be determined as the optimum thicknesses.
Second embodiment
Unlike the first embodiment, in the case of the corrosion-resistant cold-rolled steel sheet provided in the present embodiment, since the thickness of the alloy layer is determined in direct relation to the manganese equivalent, one of the methods for eliminating corrosion is to reduce the manganese equivalent (Mn) in the steel sheet bodyeq%) of the above-mentioned components, further investigation on the equivalent of manganese and the degree of corrosion of the steel plate body in this example resulted in:
as can be seen from Table 3, when the manganese equivalent is 1.14 to 5.75, the alloy layer has a thickness of more than 0.5 (Mn)eq)0.5The steel plate body has the best anti-corrosion effect, andthe reduction ratio of the elongation is less than or equal to 2, and the use requirement is met. Here, it can be seen that the manganese equivalent has a certain positive correlation with the corrosion area, so the corrosion resistance of the steel plate body is stronger as the manganese equivalent is lower, but the manganese equivalent cannot be reduced without a lower limit, in this embodiment, the lower limit of the manganese equivalent is 1%, the corrosion area is 1% when the manganese equivalent reaches 5.75%, and the upper limit of the manganese equivalent is 6% in this embodiment, so the interval value of the manganese equivalent is [1%,6%]Specific values that may be obtained include 2%, 3%, 4%, 5%, etc.
Third embodiment
In the corrosion-resistant cold-rolled steel sheet provided in this embodiment, based on the structure of the first embodiment, the alloy layer metal is in direct contact with the substrate, so that generally, the galvanic potential difference between the alloy layer and the substrate is required to be not too large, and if the galvanic potential difference is too large, galvanic corrosion is formed between the substrate and the alloy layer, thereby accelerating corrosion.
In addition, the standard electrode potential of the alloy layer should not be too high. If the standard electrode potential of the alloy layer is too high, although it has good corrosion resistance, it is liable to form galvanic corrosion effect with the substrate, and once the alloy layer has minute voids with a diameter exceeding 10nm (10 nm ± 2 nm), chlorine ions and oxygen ions are caused to react with the substrate. Conversely, if the standard electrode potential of the alloy layer is too low, although good sacrificial anodic protection is achieved, the corrosion reaction may be too rapid leading to hydrogen evolution, which may cause the alloy layer to rapidly develop porosity and fail.
Further, the electrode potential of the alloy layer can be studied to obtain:
it can be seen from Table 4 that the thickness of the alloy layer is ensured to be larger than 0.5 × (Mn)eq)0.5When the manganese equivalent is in the range of 1% -6%, the corrosion area is reduced from 22% to 0% and then increased to 31% in the process that the standard electrode potential of the alloy layer is increased from-2.37 v to 0.86 v; specific rust area less than 2%The standard electrode potential of the alloy layer is in the range of [ -0.76v, -0.14v [ -0.76v [ ]](ii) a Furthermore, as-0.76 v is close to-0.8 v, and can directly take-0.8 v for use under the condition of not strictly accurate to two digits, and the value of the other end can also directly take 0v or-0.1 v, the standard electrode potential value range of the alloy layer can be obtained [ -0.8v,0v]Or [ -0.8v, -0.1v]. Further, desirable values in this interval may be-0.7 v, -0.6v, -0.5v, -0.4v, -0.3v, -0.2v, etc.
Fourth embodiment
In the present embodiment, there is provided a manufacturing method for manufacturing the rust-resistant cold-rolled steel sheet of the first to third embodiments.
Referring to fig. 6, the method for manufacturing a corrosion-resistant cold-rolled steel sheet according to the present invention includes the following steps:
step S11: smelting a steel billet, and controlling the content of alloy elements in the steel billet;
step S12: heating, rough rolling, finish rolling, cooling and cold rolling the steel billet in sequence to obtain a steel plate body; the manganese equivalent is based on Mneq=10 × C% + Mn% +0.5 × Cr%, wherein Mn iseq% is manganese equivalent in the steel sheet body, C% is carbon content in the steel sheet body, Mn% is manganese content in the steel sheet body, and Cr% is chromium content in the steel sheet body.
Step S13: and sequentially carrying out surface treatment, heat treatment and coiling on the steel plate body to obtain the anti-corrosion cold-rolled steel plate.
The surface treatment specifically comprises the following steps: the surface of the steel plate body is covered with a coating thickness of 0.5 x (Mn) or moreeq)0.5The alloy layer of micrometers may be, specifically, 2.5 micrometers or 2 micrometers. Further, the thickness of the alloy layer is less than or equal to 2.5 microns. Furthermore, the standard electrode potential of the alloy layer can be controlled within the range of-0.8V-0V, and the anti-corrosion effect is improved.
When covering the alloy layer, specifically, the following can be adopted: physical vapor deposition and/or electroplating and/or jet deposition and the like, so that the compact structure of the alloy layer is ensured, the alloy layer has good anti-rusting capability, and the method for covering the alloy layer can be used singly or in a mixed way without limitation.
In summary, the following steps:
compared with the prior art, the anti-corrosion cold-rolled steel plate and the manufacturing method thereof provided by the embodiment of the invention comprise a steel plate body and an alloy layer covering the surface of the steel plate body, wherein the manganese equivalent of the steel plate body is determined according to the carbon content and the manganese content of the steel plate body, and the thickness of the set alloy layer is related to the manganese equivalent. The equivalent of manganese is controlled to be 1% -6%, the manganese equivalent can directly react with the steel plate body to the extent that the galvanic cell reaction can occur, and the minimum thickness of the alloy layer is determined according to the manganese equivalent. While ensuring that the thickness of the alloy layer is greater than or equal to 0.5 x (Mn)eq)0.5And the standard electrode potential is in a range of-0.8V-0V, so that the steel plate body has a good anti-corrosion effect after being covered with the alloy layer. Therefore, the anti-rust cold-rolled steel plate has good anti-rust performance under the condition of not increasing the subsequent processes and cost of storage, transportation and use.
In the fourth embodiment of the present application, it should be understood that the disclosed method can be implemented in other ways.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The anti-corrosion cold-rolled steel plate is characterized by consisting of a steel plate body and an alloy layer, wherein the alloy layer covers the surface of the steel plate body; the thickness of the alloy layer is greater than or equal to 0.5 x (Mn)eq)0.5The standard electrode potential of the alloy layer ranges from-0.8V to 0V, the manganese equivalent of the steel plate body is 1-6%, the type of the alloy layer is any one of Ni, Sn, Co, Cr and Pb, so that the area of red rust appearing in the anti-rust cold-rolled steel plate is less than 3% in a 48-hour damp-heat test with the temperature of 50 ℃ and the relative humidity of 90%; wherein the manganese equivalent is based on Mneq=10 × C% + Mn% +0.5 × Cr%, wherein Mn iseq% is manganese equivalent in the steel sheet body, C% is carbon content in the steel sheet body, Mn% is manganese content in the steel sheet body, and Cr% is chromium content in the steel sheet body.
2. A corrosion resistant cold rolled steel sheet according to claim 1, wherein said manganese equivalent is 3-4%.
3. The corrosion-resistant cold rolled steel sheet of claim 1, wherein said alloy layer has a thickness of 2.5 μm or less.
4. The corrosion resistant cold rolled steel sheet of claim 3, wherein said alloy layer has a thickness of 2 μm or less.
5. The corrosion-resistant cold rolled steel sheet of claim 1, wherein said alloy layer has a spatial structure of: columnar structure, layered structure, single crystal structure, or equiaxed crystal structure.
6. A method of manufacturing a corrosion-resistant cold rolled steel sheet for producing the corrosion-resistant cold rolled steel sheet of any one of claims 1 to 5, comprising the steps of:
smelting a steel billet, and controlling the content of alloy elements in the steel billet;
heating, rough rolling, finish rolling, cooling and cold rolling the steel billet in sequence to obtain a steel plate body;
sequentially carrying out surface treatment, heat treatment and coiling on the steel plate body to obtain the anti-corrosion cold-rolled steel plate;
controlling the content of alloy elements in the steel billet to enable the manganese equivalent of the steel plate body to be 1% -6%, wherein the manganese equivalent is determined according to Mneq=10 × C% + Mn% +0.5 × Cr%, wherein Mn iseq% is manganese equivalent in the steel sheet body, C% is carbon content in the steel sheet body, Mn% is manganese content in the steel sheet body, Cr% is chromium content in the steel sheet body; the surface treatment is to coat the surface of the steel plate body with a thickness of 0.5 x (Mn)eq)0.5Micron alloy layer with standard electrode potential of-0.8V-0V; the kind of the alloy layer is any one of Ni, Sn, Co, Cr and Pb; in a 48-hour damp-heat test with the temperature of 50 ℃ and the relative humidity of 90%, the area of red rust of the anti-rust cold-rolled steel plate is less than 3%.
7. The method of claim 6, wherein the amount of the alloying element in the steel slab is controlled such that the steel slab has a manganese equivalent of 3% to 4%.
8. The method of claim 6, wherein the alloy layer has a thickness of 2.5 microns or less.
9. The method of claim 6, wherein the alloy layer has a thickness of 2 microns or less.
10. The method of claim 6, wherein the spatial structure of the alloy layer is: columnar structure, layered structure, single crystal structure, or equiaxed crystal structure.
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| CN1082988A (en) * | 1992-06-22 | 1994-03-02 | 东洋钢钣株式会社 | Erosion-resisting Nickeled Steel Plate or steel bar and method for making thereof |
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