CN115094319B - Pickled sheet material, method of making same, and articles - Google Patents
Pickled sheet material, method of making same, and articles Download PDFInfo
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- CN115094319B CN115094319B CN202210722944.4A CN202210722944A CN115094319B CN 115094319 B CN115094319 B CN 115094319B CN 202210722944 A CN202210722944 A CN 202210722944A CN 115094319 B CN115094319 B CN 115094319B
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 34
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- 229910052799 carbon Inorganic materials 0.000 claims abstract description 32
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 31
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 31
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229910052796 boron Inorganic materials 0.000 claims abstract description 31
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 31
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 31
- 239000000126 substance Substances 0.000 claims abstract description 24
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052742 iron Inorganic materials 0.000 claims abstract description 17
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 17
- 239000010936 titanium Substances 0.000 claims abstract description 17
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000011593 sulfur Substances 0.000 claims abstract description 15
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 12
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- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 11
- 239000011574 phosphorus Substances 0.000 claims abstract description 11
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 10
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- 239000012535 impurity Substances 0.000 claims abstract description 7
- 238000005554 pickling Methods 0.000 claims description 100
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- 239000002253 acid Substances 0.000 claims description 89
- 238000001816 cooling Methods 0.000 claims description 51
- 238000005260 corrosion Methods 0.000 claims description 38
- 238000005266 casting Methods 0.000 claims description 37
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- MTJGVAJYTOXFJH-UHFFFAOYSA-N 3-aminonaphthalene-1,5-disulfonic acid Chemical compound C1=CC=C(S(O)(=O)=O)C2=CC(N)=CC(S(O)(=O)=O)=C21 MTJGVAJYTOXFJH-UHFFFAOYSA-N 0.000 claims description 7
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- 238000003723 Smelting Methods 0.000 claims description 3
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- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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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
-
- 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
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
-
- 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
-
- 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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/04—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
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- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The application provides a pickled plate material, a manufacturing method thereof and a product, wherein the pickled plate material has the following chemical composition in percentage by mass: carbon: 0.20 to 0.24 percent; silicon: 0.20 to 0.40 percent; manganese: 1.00% -1.30%; phosphorus: less than 0.015 percent; sulfur: 0.005% or less; chromium: 0.15 to 0.35 percent; titanium: 0.02% -0.04%; boron: 0.0025 to 0.004 percent; nitrogen: less than 0.004%, preferably 0.0021% -0.0038%; acid-soluble aluminum: 0.01 to 0.06 percent, and the balance of iron and impurities; wherein, 5.72% is less than or equal to 19.4[% carbon ] +0.88[% manganese ] + [% chromium ] +88.4[% boron ] < 5.91%. The chemical component content of the acid-washing plate material provided by the application is low, and a product manufactured by using the acid-washing plate material is high in strength, free of color difference and low in production cost.
Description
Technical Field
The application relates to the technical field of acid-washing plates, in particular to an acid-washing plate material and a manufacturing method and a product thereof.
Background
With the approaching of the aim of 'double carbon', the light weight requirement of automobiles puts forward higher weight reduction requirement on steel materials, and the application range of the steel materials as hot forming steel which has high strength and easy forming is wider and wider. The hot-rolled pickled hot-formed steel has good surface quality, wide thickness specification range and higher cost performance, but the surface quality of the steel plate is reduced due to the phenomenon of blackening or chromatic aberration of the surface of the steel plate after pickling in the actual production process.
Disclosure of Invention
The application provides a pickled plate material, a manufacturing method thereof and a product, which can effectively reduce the color difference existing on the surface of the pickled plate material.
In a first aspect, the present application provides a pickled sheet material having a chemical composition, in mass percent, as shown below:
carbon: 0.20 to 0.24 percent;
silicon: 0.20 to 0.40 percent;
manganese: 1.00% -1.30%;
phosphorus: less than 0.015%, preferably 0.006% to 0.013%;
sulfur: less than 0.005%, preferably 0.0018% to 0.0038%;
chromium: 0.15 to 0.35 percent;
titanium: 0.02% -0.04%;
boron: 0.0025 to 0.004 percent;
nitrogen: less than 0.004%, preferably 0.0021% -0.0038%;
acid-soluble aluminum: 0.01% to 0.06%, and
the balance iron and impurities;
wherein the carbon content [% carbon ], the manganese content [% manganese ], the chromium content [% chromium ], and the boron content [% boron ] satisfy the following relationships:
5.72% or less than 19.4[% carbon ] +0.88[% manganese ] + [% chromium ] +88.4[% boron ] < 5.91%.
According to the technical scheme, the surface roughness of the acid pickling plate material and the thickness of the intercrystalline oxide layer can be effectively reduced by reasonably selecting the chemical composition and the content, so that the color difference existing on the surface of the acid pickling plate material is effectively reduced, and the purpose of improving the surface quality of the acid pickling plate material is achieved.
In some embodiments of the present application, the pickled plate material has a surface roughness of 1.4 μm to 1.7 μm.
In some embodiments of the present application, the intergranular oxide layer of the pickled plate material has a thickness of 1.5 μm to 3 μm.
In a second aspect, the present application provides a method of manufacturing pickled sheet material, the method comprising the steps of:
providing a billet having the chemical composition of any of the embodiments described above;
feeding the casting blank into a heating furnace at 800-950 ℃;
rolling the heated casting blank to obtain a steel belt;
cooling the steel strip at a first stage cooling rate R 1 ＝v 1 +k 1 ×a 1/2 Cooling to a temperature of 580-600 ℃, and then cooling at a second stage cooling rate R 2 ＝v 2 +k 2 ×a 1/2 Cooling to coiling temperature T Coiling ＝T+k×a 1/2 X b and is in T Coiling Coiling under the condition to obtain a hot rolled steel plate material;
pickling, rinsing, drying and oiling the hot-rolled steel plate material to obtain a pickled plate material;
wherein R is 1 Represents the first stage cooling rate in deg.C/s;
v 1 60-80 ℃/s;
a represents the thickness of the hot-rolled steel sheet material in mm;
k 1 correction factor, k, representing the first stage cooling rate 1 Is 29.4 ℃/s mm 1/2 ；
R 2 Represents the second stage cooling rate in ℃/s;
v 2 10 ℃/s-30 ℃/s;
k 2 correction factor, k, representing the second stage cooling rate 2 Is 8.6 ℃/s mm 1/2 ；
T Coiling Represents the coiling temperature in ℃/s;
t is 410-430 ℃;
k represents a correction coefficient of the coiling temperature, and k is 26.2X 10 -3 ℃/mm 3/2
b represents the width of the hot rolled steel sheet material in mm.
According to the technical scheme, the manufacturing method is simple in process, and the pickled plate which is low in strength, high in elongation and free of color difference is obtained by adopting fast cooling and slow cooling, coiling at low temperature, pickling, rinsing, drying and oiling, so that the pickled plate is easy to machine and form and uniform in color.
In some embodiments of the present application, the providing a casting block comprises:
providing a raw material having the chemical composition described in the above examples;
smelting, refining and continuously casting the raw materials in sequence to obtain a casting blank, wherein the mass ratio of calcium to sulfur in the refining silicon-calcium treatment process is 1.0-3.0;
optionally, in the continuous casting treatment process of the casting blank, the reduction of the casting blank is 5mm to 15mm.
In some embodiments of the present application, the heating furnace comprises a preheating section, a first heating section, a second heating section and a soaking section, wherein the temperatures of the second heating section and the soaking section are 1160 ℃ to 1220 ℃.
In some embodiments of the present application, the rolling the heated cast slab to obtain a steel strip includes:
and sequentially carrying out rough rolling and finish rolling treatment on the heated casting blank, wherein the finish rolling finishing temperature is 840-900 ℃.
In some embodiments of the present application, the acid washing comprises a first stage acid washing, a second stage acid washing, a third stage acid washing, a fourth stage acid washing and a fifth stage acid washing, wherein in the fourth stage acid washing and the fifth stage acid washing, a corrosion inhibitor is added to cooperate with the acid liquor for acid washing;
optionally, the pickling temperature is 70-85 ℃;
optionally, in the first-stage acid washing, the concentration of the acid liquor is 30-40 g/L;
optionally, in the second-stage acid washing, the third-stage acid washing and the fourth-stage acid washing, the concentration of the acid solution is 70 g/L-90 g/L;
optionally, in the fifth stage of acid washing, the concentration of the acid solution is 130g/L to 150g/L;
optionally, the concentration of the corrosion inhibitor in the fourth pickling section is 30 to 40 percent of that of the corrosion inhibitor in the fifth pickling section;
optionally, in the fifth stage of acid washing, the concentration of the corrosion inhibitor is 0.03g/L to 0.04g/L.
In some embodiments of the present application, the pickling speed R in the fourth and fifth stage pickling 3 ＝v 3 +k 3 ×C Acid liquor /C Corrosion inhibitor 3/2 ；
Wherein R is 3 The pickling speed is expressed in the unit of m/min;
v 3 40m/min to 50m/min;
k 3 correction coefficient, k, representing pickling speed 3 Is 3.18X 10 -3 m·g 1/2 /s·L 1/2 ；
C Acid liquor The concentration of the acid liquor is expressed in g/L;
C corrosion inhibitor The concentration of the corrosion inhibitor is expressed in g/L.
In a third aspect, the present application also provides an article made from the pickled sheet material described in any of the above embodiments.
According to the technical scheme, the product is high in strength, free of color difference and low in production cost.
Optionally, the yield strength of the article is above 500 MPa;
optionally, the article has a tensile strength above 650 MPa;
optionally, the elongation of the article is above 17%.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.
FIG. 1 illustrates the surface quality of hot rolled steel sheets after pickling in some examples of the present application;
FIG. 2 is a graph showing surface quality of hot rolled steel sheets after acid pickling according to some comparative examples of the present application;
FIG. 3 illustrates the hot rolled scale thickness in some embodiments of the present application;
FIG. 4 shows the hot rolled scale thickness in some comparative examples of the present application;
FIG. 5 illustrates the thickness of the intergranular oxide layer after acid washing in some embodiments of the present application;
FIG. 6 shows the thickness of the intergranular oxide layer after pickling in some comparative examples of the present application.
Specific embodiments of the present application have been shown by way of example in the drawings and will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
The examples or embodiments are described in a progressive arrangement throughout this specification, each with emphasis on illustrating differences from the other examples.
In the description herein, references to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.
The application provides a pickling plate material which comprises the following chemical compositions in percentage by mass:
carbon: 0.20 to 0.24 percent;
silicon: 0.20 to 0.40 percent;
manganese: 1.00% -1.30%;
phosphorus: less than 0.015%, preferably 0.006% to 0.013%;
sulfur: less than 0.005%, preferably 0.0018% to 0.0038%;
chromium: 0.15 to 0.35 percent;
titanium: 0.02 to 0.04 percent;
boron: 0.0025 to 0.004 percent;
nitrogen: less than 0.004%, preferably 0.0021% -0.0038%;
acid-soluble aluminum: 0.01% to 0.06%, and
the balance iron and impurities;
wherein the carbon content [% carbon ], the manganese content [% manganese ], the chromium content [% chromium ], and the boron content [% boron ] satisfy the following relationships:
5.72 percent to 19.4[% carbon ] +0.88[% manganese ] + [% chromium ] +88.4[% boron ] < 5.91%.
The chemical composition and content in the technical scheme of the application are explained in detail below.
(carbon: 0.20% -0.24%)
Carbon (C): the content of C, which is an interstitial atom in the steel sheet material, plays a crucial role in improving the strength of the steel sheet material, especially the yield strength and tensile strength of the steel sheet material. If the C content is set too low, the effect of enhancing the yield strength and tensile strength of the steel sheet material is insufficient, and if the C content is set too high, the weldability of the steel sheet material may be affected. Therefore, in the examples of the present application, the C content is set to 0.20% to 0.24%.
(silicon: 0.20% -0.40%)
Silicon (Si): si is a solid solution strengthening element and can improve the strength of the steel. If the Si content is too low, the effect of enhancing the strength of the steel is insufficient, and if the Si content is too high, the high melting point oxide formed on the surface of the steel sheet affects the surface quality of the steel sheet, so the Si content is set to 0.20% to 0.40% in the present invention.
(manganese 1.00% -1.30%)
Manganese (Mn): mn belongs to a replacement type element and plays a role in solid solution strengthening; it can stabilize austenite, refine crystal grains and delay the transformation from austenite to pearlite. If the Mn content is too low, the steel is easily transformed into a pearlite-type structure during quenching; if the Mn content is too high, center segregation is likely to occur and the alloy cost is affected, so the Mn content is set to 1.00% to 1.30% in the present invention.
(phosphorus: 0.015% or less) and (sulfur: 0.005% or less)
Phosphorus (P) and sulfur (S): p and S as harmful inclusions in steel have great damage effects on the cold formability, low-temperature toughness, weldability and fatigue crack propagation resistance of the steel; the invention controls the content of P to be less than or equal to 0.015 percent and the content of S to be less than or equal to 0.005 percent from the aspects of reducing the production cost and improving the product quality, so that the influence of P and S on the forming performance is reduced to the lowest level.
In some embodiments of the present application, the P content can also be set in the range of 0.006% to 0.013%; and the S content can be set to 0.0018% -0.0038%.
(chromium: 0.15% -0.35%)
Chromium (Cr): the Cr element can improve the hardenability of steel, simultaneously reduce the caking property of iron scales on the surface of strip steel, reduce the pulverization of the iron scales and improve the surface quality of a steel plate, but the Cr content is too high, the center segregation can occur, and the cost is higher, so the Cr content is set to be 0.15-0.35 percent in the invention.
(titanium: 0.02% -0.04%)
Titanium (Ti): the Ti element has certain fine crystal strengthening and precipitation strengthening effects. A small amount of Ti can also improve the welding performance, and the invention mainly exerts the fine grain strengthening and welding performance of Ti, so that the content of Ti is set to be 0.020-0.040%.
(boron: 0.0025 to 0.004%)
Boron (B): the B element is an element with strong hardenability effect in the steel, and the hardenability in the steel can be greatly improved by trace B. If the content of B is too low, the quenching cannot be achieved, and if the content of B is too high, the intercrystalline bonding force is deteriorated, and the probability of intercrystalline oxidation is increased. Therefore, in the present invention, the B content is set to 0.002% to 5 to 0.0040%.
(Nitrogen: 0.004% or less)
Nitrogen (N): n belongs to harmful elements in steel, the content of N is controlled to be less than or equal to 0.004 percent, and the risk of generating TiN inclusions can be reduced.
In some embodiments of the present application, the N content may be set in the range of 0.0021% to 0.0038%.
(acid-soluble aluminum: 0.01% -0.06%)
Acid-soluble aluminum (Als): als has a deoxidation effect in the steelmaking process, and can improve the purity of molten steel. In addition, als can fix N in the steel and form a stable compound with N to effectively refine crystal grains, but if the content of Als is too high, the crystal grain coarsening temperature of the steel is obviously influenced, and the temper brittleness is increased. Therefore, the content of Als in the present invention is set to 0.010% to 0.060%.
Further, the carbon content, manganese content, chromium content and boron content satisfy the following relationship:
5.72-19.4 [% carbon ] +0.88[% manganese ] + [% chromium ] +88.4[% boron ] < 5.91%
If the relation is greater than 5.91%, the tensile strength of the hot rolled steel coil is too high, and the further processing of the steel coil is influenced; if the relation is less than 5.72%, the material is not hardened sufficiently after hot forming, and the tensile strength of the material cannot meet the use requirement.
In some embodiments of the present application, the pickled sheet material comprising the above-described ingredients has a roughness of 1.4 μm to 1.7 μm as measured.
In some of the above embodiments, the rougher the surface of the pickled plate material, the deeper the valleys are, the smaller the radius of curvature of the valleys is, the more sensitive to stress concentration, and thus the greater the surface roughness of the material, the more sensitive it is to stress concentration, and the lower its fatigue resistance is; meanwhile, the larger the roughness is, the more easily dust, deteriorated lubricating oil and acidic and basic corrosive substances are deposited at the wave trough and permeate into the inner layer of the material, so that the corrosion of parts is accelerated, and the smaller the roughness is, the better the wear resistance of the material is; however, the roughness is too low, and the lubricating oil is not easy to store, so that molecular adhesion is easy to occur on the contact surface, and the friction force is increased. Therefore, the pickled plate material has good fatigue strength, corrosion resistance and wear resistance when the roughness is 1.4 to 1.7 μm.
In some embodiments of the present application, the pickled plate material containing the above components has an intergranular oxide layer thickness of 1.5 μm to 3 μm, as measured.
In some of the above embodiments, the thickness of the intergranular oxidation layer of the material is too large, and the thickness of the intergranular oxidation layer differs in the width direction of the steel sheet because the severity of the intergranular oxidation is related to the oxidizing atmosphere. Acid liquor can corrode the surface of the strip steel through intercrystalline oxidation during acid cleaning, so that the effect is intensified, the roughness in the width direction of the strip steel is different, and color difference occurs. Therefore, the thickness of the intergranular oxide layer of the acid-washing plate material is 1.5-3 μm, and the material can be ensured to avoid color difference.
According to the technical scheme, the surface roughness of the acid pickling plate material and the thickness of the intercrystalline oxide layer can be effectively reduced by reasonably selecting the chemical composition and the content, so that the color difference existing on the surface of the acid pickling plate material is effectively reduced, and the purpose of improving the surface quality of the acid pickling plate material is achieved.
Hereinafter, a method for manufacturing a hot-rolled steel sheet material according to the present invention will be described in detail.
The application provides a manufacturing method of a pickled plate material, which comprises the following steps:
s10: providing a cast slab, wherein the cast slab has the chemical composition of any one of the embodiments, and the chemical composition is as follows: carbon: 0.20 to 0.24 percent; silicon: 0.20 to 0.40 percent; manganese: 1.00% -1.30%; phosphorus: less than 0.015%, preferably 0.006% to 0.013%; sulfur: less than 0.005%, preferably 0.0018% to 0.0038%; chromium: 0.15 to 0.35 percent; titanium: 0.02 to 0.04 percent; boron: 0.0025 to 0.004 percent; nitrogen: less than 0.004%, preferably 0.0021% -0.0038%; acid-soluble aluminum: 0.01 to 0.06 percent, and the balance of iron and impurities; wherein the carbon content [% carbon ], the manganese content [% manganese ], the chromium content [% chromium ], and the boron content [% boron ] satisfy the following relationships: 5.72 percent to 19.4[% carbon ] +0.88[% manganese ] + [% chromium ] +88.4[% boron ] < 5.91%.
S20: feeding the casting blank into a heating furnace at 800-950 ℃;
s30: rolling the heated casting blank to obtain a steel strip;
s40: cooling the steel strip at a first stage cooling rate R 1 ＝v 1 +k 1 ×a 1/2 Cooling to a temperature of 580 ℃ to 600 ℃, followed by a second stage cooling rate R 2 ＝v 2 +k 2 ×a 1/2 Cooling to coiling temperature T Coiling ＝T+k×a 1/2 X b is in T Coiling Coiling under the condition to obtain a hot rolled steel plate material;
s50: and (3) pickling, rinsing, drying and oiling the hot-rolled steel plate material to obtain a pickled plate material.
Wherein R is 1 Represents the first stage cooling rate in ℃/s;
v 1 60-80 ℃/s;
a represents the thickness of the hot rolled steel sheet material in mm;
k 1 correction factor, k, representing the first stage cooling rate 1 Is 29.4 ℃/s mm 1/2 ；
R 2 Represents the second stage cooling rate in ℃/s;
v 2 is 10 ℃/s to 30 ℃/s;
k 2 correction factor, k, representing the second stage cooling rate 2 Is 8.6 ℃/s.mm 1/2 ；
T Coiling Represents the coiling temperature in ℃/s;
t is 410-430 ℃;
k represents a correction coefficient of the coiling temperature, and k is 26.2X 10 -3 ℃/mm 3/2 ；
b represents the width of the hot rolled steel sheet material in mm.
In some embodiments of the present application, S10 specifically includes the following steps:
s11: providing a starting material having the chemical composition of the above examples, the chemical composition of the starting material being as follows: carbon: 0.20 to 0.24 percent; silicon: 0.20 to 0.40 percent; manganese: 1.00% -1.30%; phosphorus: less than 0.015%, preferably 0.006% to 0.013%; sulfur: less than 0.005%, preferably 0.0018% to 0.0038%; chromium: 0.15 to 0.35 percent; titanium: 0.02% -0.04%; boron: 0.0025 to 0.004 percent; nitrogen: less than 0.004%, preferably 0.0021% -0.0038%; acid-soluble aluminum: 0.01 to 0.06 percent, and the balance of iron and impurities; wherein the carbon content [% carbon ], the manganese content [% manganese ], the chromium content [% chromium ] and the boron content [% boron ] satisfy the following relationships: 5.72 percent to 19.4[% carbon ] +0.88[% manganese ] + [% chromium ] +88.4[% boron ] < 5.91%;
s12: the raw materials are sequentially smelted, refined and continuously cast to obtain a casting blank, wherein the mass ratio of calcium to sulfur in the refining silicon-calcium treatment process is 1.0-3.0. In the continuous casting treatment process of the casting blank, the reduction of the casting blank is 5 mm-15 mm.
In some embodiments, the refining treatment by using silicon-calcium treatment not only can purify the molten steel, but also can modify the sulfide in the steel to change the sulfide into non-deformable, stable and fine spherical sulfide, thereby being beneficial to improving the formability of the product.
In the continuous casting treatment process of the casting blank, the reduction of the casting blank is 5 mm-15 mm. The segregation degree of elements at the final stage of solidification can be obviously reduced, so that the center segregation of the casting blank is reduced.
In some embodiments of the present application, the ingot is fed into the furnace at 800 ℃ to 950 ℃ in the S20 step, since the intergranular oxidation is also temperature dependent. Experiments prove that the hot forming steel has serious intergranular oxidation within the range of 580-800 ℃ and reaches the maximum value at 680 ℃. On the basis, the temperature is increased and decreased, and the degree of intergranular oxidation is reduced. When the temperature is higher than 800 ℃, because a thicker oxide layer is generated on the surface of the steel plate, the contact between oxygen in the air and the iron base is weakened, and thus the intergranular oxidation is greatly relieved. Therefore, the casting blank enters the heating furnace at 800-950 ℃, and the casting blank can be prevented from being subjected to intercrystalline oxidation at high temperature, so that the casting blank is further deteriorated in the heating furnace.
In some embodiments of the present application, the heating furnace in S20 includes a preheating section, a first heating section, a second heating section, and a soaking section, wherein the temperatures of the second heating section and the soaking section are 1160 ℃ to 1220 ℃.
In some embodiments, the reasonable heating temperature is designed to ensure that Ti is fully dissolved, which is further beneficial to improving the precipitation strengthening effect.
In some embodiments of the present application, S30 specifically includes the following steps:
and (3) sequentially carrying out rough rolling and finish rolling treatment on the heated casting blank, wherein the finish rolling finishing temperature is 840-900 ℃.
The finish rolling finishing temperature is too low, which causes mixed crystals in the two-phase region rolling, so the finish rolling finishing temperature is controlled in the range of 840-900 ℃ in the application.
In the step S40 of the present application, the first stage cooling is rapid cooling, and the finishing temperature of the rapid cooling temperature is 580 to 600 ℃, mainly in a temperature range where intergranular oxidation is easily generated by rapidly passing through a steel plate. Thus, the first stage cooling rate satisfies the following relationship: r 1 ＝v 1 +k 1 ×a 1/2 Wherein R is 1 Represents the first stage cooling rate in ℃/s; v. of 1 60-80 ℃/s; k is a radical of 1 Indicating the cooling rate of the first stageCorrection factor of rate, k 1 Is 29.4 ℃/s mm 1/2 (ii) a a represents the thickness of the hot rolled steel sheet material in mm.
Further, in the step S40, the second-stage cooling adopts weak cooling, and because the temperature of the steel plate is reduced to be below the serious intergranular oxidation interval, the cooling rate is reduced, and the internal stress generated in the first-stage rapid cooling process can be homogenized. Thus, the second stage cooling rate satisfies the following relationship: r is 2 ＝v 2 +k 2 ×a 1/2 Wherein R is 2 Represents the second stage cooling rate in ℃/s; v. of 2 10 ℃/s-30 ℃/s; k is a radical of 2 Correction factor, k, representing the second stage cooling rate 2 Is 8.6 ℃/s.mm 1/2 (ii) a a represents the thickness of the hot rolled steel sheet material in mm.
In addition, in step S40, since a large amount of heat is generated due to the phase transition, low-temperature coiling is adopted, mainly to prevent the temperature from being too high, and intergranular oxidation is generated in the steel coil cooling process. And the coiling temperature is too low, a large amount of bainite and even martensite structures can be generated in the structures, so that the problems of too high strength, too large internal stress and the like are caused. Therefore, the coiling temperature satisfies the following relationship: t is Coiling ＝T+k×a 1/2 X b, wherein, T Coiling Represents the coiling temperature in ℃/s; t is 410-430 ℃; k represents a correction coefficient of the coiling temperature, and k is 26.2X 10 -3 ℃/mm 3/2 (ii) a a represents the thickness of the hot rolled steel sheet material in mm; b represents the width of the hot rolled steel sheet material in mm.
As can be seen from comparison between FIG. 3 and FIG. 4, the surface roughness and the scale thickness of the hot rolled steel sheet prepared under the above conditions are significantly lower than those of the comparative example, so that the pickled sheet obtained after the subsequent acid washing has higher quality.
In some embodiments of the present application, in the S40 step, the acid washing includes a first acid washing, a second acid washing, a third acid washing, a fourth acid washing, and a fifth acid washing, wherein in the fourth acid washing and the fifth acid washing, a corrosion inhibitor is added to cooperate with the acid washing.
The pickling is mainly used for washing away iron scales on the surface of a hot rolled steel plate, and for preventing the pickled plate from generating color difference due to over pickling of the steel plate and influencing the quality of the pickled plate, so that a corrosion inhibitor is added in the fourth pickling and the fifth pickling to prevent the over pickling of the steel plate under the condition that most of the iron scales are washed away by acid in the first pickling tank, the second pickling tank and the third pickling tank.
Further, the pickling efficiency is temperature dependent, the temperature is too low, the reaction rate is too slow, and the production efficiency is affected, and the temperature is too high, which may cause the reaction to be too violent, and cause the over-pickling of the steel plate, and the quality of the steel plate is affected. Therefore, the temperature of the acid washing is controlled within the range of 70-85 ℃.
Furthermore, in the first-stage acid washing, the concentration of the acid liquor is 30-40 g/L; in the second-stage acid washing, the third-stage acid washing and the fourth-stage acid washing, the concentration of the acid liquor is 70 g/L-90 g/L; in the fifth stage of acid washing, the concentration of the acid liquor is 130 g/L-150 g/L.
In the five-section pickling process, the concentration of the acid liquor is from low to high, so that the iron scale on the surface of the steel plate can be uniformly removed, the iron loss can be reduced, and the problems of over-corrosion, hydrogen embrittlement and the like can be prevented.
In addition, the concentration of the corrosion inhibitor in the fourth stage of acid washing is 30-40% of that in the fifth stage of acid washing; in the fifth stage of acid washing, the concentration of the corrosion inhibitor is 0.03 g/L-0.04 g/L.
Because the main iron scale on the surface of the steel plate is washed after three-stage pickling, in order to reduce the dissolution of a metal matrix and prevent the steel plate from being over-corroded and hydrogen embrittlement, the corrosion inhibitor is added into the acid liquor of the fourth-stage and fifth-stage pickling, the corrosion inhibitor can be adsorbed by the surface of the steel plate, and a double electric layer at the interface of the steel plate and the acid liquor is changed, so that the discharge of hydrogen ions is hindered, the corrosion of the acid liquor on the steel plate can be isolated, and the hydrogen embrittlement can be prevented.
In some embodiments of the present application, the acid pickling rate R is in the fourth stage acid pickling and the fifth stage acid pickling 3 ＝v 3 +k 3 ×C Acid liquor /C Corrosion inhibitor 3/2 (ii) a Wherein R is 3 The pickling speed is expressed in the unit of m/min; v. of 3 40m/min to 50m/min; k is a radical of formula 3 Indicates the pickling speedCorrection coefficient of (k) 3 Is 3.18X 10 -3 m·g 1/2 /s·L 1/2 ；C Acid liquor The concentration of the acid liquor is expressed in g/L; c Corrosion inhibitor The concentration of the corrosion inhibitor is expressed in g/L.
In some embodiments, the steel plate with the main scale removed is subjected to the fourth and fifth pickling processes, and the proper pickling speed is determined by the concentrations of the acid solution and the corrosion inhibitor, so that the steel plate with no color difference, low roughness and small intergranular oxidation thickness can be obtained.
As can be seen from a comparison of FIGS. 1 and 2, the steel sheet after pickling did not show any significant color difference under the above pickling conditions. And by comparing fig. 5 and 6, the roughness and intergranular oxidation thickness of the surface of the steel sheet after pickling are significantly lower than those of the comparative example by using the above pickling conditions, and the quality of the obtained steel sheet is higher.
According to the technical scheme, the manufacturing method is simple in process, and the pickled plate which is low in strength, high in elongation and free of color difference is obtained by adopting fast cooling and slow cooling, coiling at low temperature, pickling, rinsing, drying and oiling, so that the pickled plate is easy to machine and form and uniform in color.
The present application also provides an article made from the pickled sheet material of any of the embodiments described above. Therefore, the product has high strength, no color difference and low production cost.
In some embodiments of the present application, the properties of the above product materials are tested, and the product has a yield strength of 500MPa or more, a tensile strength of 650 MPa-760 MPa, and an elongation of 17% or more.
Hereinafter, the method for producing the pickled plate material and the product of the present application will be described in more detail with reference to examples, but the present application is not limited to these examples at all.
In the following examples and comparative examples, pickled sheet materials and articles according to embodiments of the present application were manufactured under various conditions, and mechanical properties of the resultant pickled sheet materials and articles were measured, wherein the mechanical properties were required according to the test method in GB/T228.1-2010, and the results of property measurements of the products obtained in the respective examples and comparative examples are shown in table 4.
Example 1
The embodiment provides a manufacturing method of a pickled plate material, which comprises the following steps:
s10: providing a cast slab having the chemical composition of any one of the embodiments above, wherein the chemical composition is as follows: carbon: 0.202 percent; silicon: 0.38 percent; manganese: 1.26 percent; phosphorus: 0.011; sulfur: 0.0024%; chromium: 0.35 percent; titanium: 0.021%; boron: 0.0039%; nitrogen: 0.0021%; acid-soluble aluminum: 0.022%, and the balance iron and impurities; wherein the carbon content [% carbon ], the manganese content [% manganese ], the chromium content [% chromium ], and the boron content [% boron ] satisfy the following relationships: 19.4[% carbon ] +0.88[% manganese ] + [% chromium ] +88.4[% boron ] =5.72236%;
the raw materials are sequentially subjected to smelting, refining and continuous casting treatment to obtain a casting blank, wherein the mass ratio of calcium to sulfur in the refining silicon-calcium treatment process is 1.86. In the continuous casting treatment process of the casting blank, the reduction of the casting blank is 12mm;
s20: feeding the casting blank into a heating furnace at 825 ℃, wherein the heating furnace specifically comprises a preheating section, a first heating section, a second heating section and a soaking section, and the temperatures of the second heating section and the soaking section are 1160 ℃;
s30: sequentially carrying out rough rolling and finish rolling treatment on the heated casting blank, wherein the finish rolling finishing temperature is 886 ℃, and obtaining a steel strip;
s40: cooling the steel strip to 600 ℃ at a first section cooling rate of 141 ℃/s, then cooling to 533 ℃ at a second section cooling rate of 48 ℃/s, and coiling at 533 ℃ to obtain a hot rolled steel plate material;
s50: pickling, rinsing, drying and oiling the hot-rolled steel plate material to obtain a pickled plate material;
the pickling specifically comprises a first section of pickling, a second section of pickling, a third section of pickling, a fourth section of pickling and a fifth section of pickling, wherein in the fourth section of pickling and the fifth section of pickling, a corrosion inhibitor is added to be matched with acid liquor for pickling;
wherein the pickling temperature is 78 ℃;
in the first stage of acid washing, the concentration of the acid liquor is 33g/L; in the second-stage acid washing, the third-stage acid washing and the fourth-stage acid washing, the concentration of the acid liquor is 71g/L; in the fifth stage of acid washing, the concentration of the acid liquor is 132g/L;
the concentration of the corrosion inhibitor in the fourth section of acid washing is 0.01085g/L; the concentration of the corrosion inhibitor in the fifth stage of acid washing is 0.031g/L;
in the fourth pickling and the fifth pickling, the pickling speed was 124m/min.
Example 2
This example differs from example 1 in that: for the different reaction parameters, please refer to table 1-table 3.
Example 3
This example differs from example 1 in that: for the different reaction parameters, please refer to table 1-table 3.
Example 4
This example differs from example 1 in that: for the differences of the reaction parameters, please refer to tables 1-3.
Example 5
This example differs from example 1 in that: for the different reaction parameters, please refer to table 1-table 3.
Example 6
The present example differs from example 1 in that: for the differences of the reaction parameters, please refer to tables 1-3.
Example 7
This example differs from example 1 in that: for the differences of the reaction parameters, please refer to tables 1-3.
Example 8
This example differs from example 1 in that: for the differences of the reaction parameters, please refer to tables 1-3.
Comparative example 1
The chemical components and contents of the comparative example are the same as those of the example 5, and the difference is that: for the differences of the reaction parameters, please refer to tables 2 and 3.
Comparative example 2
The comparative example has the same chemical components and contents as example 2, and is different from the comparative example in that: for the differences of the reaction parameters, please refer to tables 2 and 3.
Comparative example 3
The comparative example has the same chemical components and contents as example 8, except that: for the different reaction parameters, please refer to tables 2 and 3.
TABLE 1
| C | Si | Mn | P | S | B | Cr | Ti | Als | N | |
| Example 1 | 0.202 | 0.38 | 1.26 | 0.011 | 0.0024 | 0.0039 | 0.35 | 0.021 | 0.022 | 0.0021 |
| Example 2 | 0.208 | 0.33 | 1.28 | 0.008 | 0.0032 | 0.0036 | 0.33 | 0.023 | 0.034 | 0.0034 |
| Example 3 | 0.211 | 0.29 | 1.22 | 0.013 | 0.0018 | 0.0033 | 0.31 | 0.025 | 0.043 | 0.0038 |
| Example 4 | 0.216 | 0.25 | 1.18 | 0.006 | 0.0022 | 0.0031 | 0.29 | 0.028 | 0.026 | 0.0029 |
| Example 5 | 0.220 | 0.21 | 1.15 | 0.010 | 0.0029 | 0.0029 | 0.26 | 0.031 | 0.031 | 0.0021 |
| Example 6 | 0.225 | 0.27 | 1.11 | 0.012 | 0.0034 | 0.0025 | 0.22 | 0.033 | 0.038 | 0.0026 |
| Example 7 | 0.229 | 0.33 | 1.08 | 0.009 | 0.0038 | 0.0035 | 0.18 | 0.035 | 0.041 | 0.0032 |
| Example 8 | 0.238 | 0.39 | 1.03 | 0.013 | 0.0035 | 0.0026 | 0.15 | 0.039 | 0.035 | 0.0033 |
Note: c represents the mass content of carbon in units of%;
si represents the mass content of silicon in units of%;
mn represents the mass content of manganese in units of%;
p represents the mass content of phosphorus in units of%;
s represents the mass content of sulfur, and the unit is%;
b represents the mass content of boron, and the unit is%;
cr represents the mass content of chromium in%;
ti represents the mass content of titanium, in%;
als represents the mass content of acid-soluble aluminum, and the unit is percent;
n represents the mass content of nitrogen in%.
TABLE 2
| T Casting blank | T Heating of | T Finish rolling | R 1 | R 2 | T Coiling | |
| Example 1 | 825 | 1160 | 886 | 141 | 48 | 533 |
| Example 2 | 887 | 1210 | 895 | 140 | 45 | 528 |
| Example 3 | 854 | 1180 | 879 | 135 | 41 | 511 |
| Example 4 | 863 | 1200 | 885 | 126 | 40 | 501 |
| Example 5 | 905 | 1220 | 844 | 128 | 37 | 496 |
| Example 6 | 837 | 1190 | 857 | 115 | 32 | 482 |
| Example 7 | 844 | 1170 | 862 | 104 | 28 | 471 |
| Example 8 | 872 | 1180 | 893 | 114 | 35 | 465 |
| Comparative example 1 | 615 | 1210 | 882 | 65 | 73 | 533 |
| Comparative example 2 | 840 | 1180 | 897 | 118 | 35 | 642 |
| Comparative example 3 | 863 | 1200 | 855 | 108 | 41 | 480 |
Note: t is Casting blank The temperature of the cast slab before heating in step S20 is expressed in units of;
T heating of The temperature of the second heating section and the soaking section in the step S20 is expressed in units of;
T finish rolling Represents the finish rolling finish temperature in the step S30, and the unit is;
R 1 expressed as the first stage cooling rate in step S40 in deg.c/S;
R 2 expressed as the second stage cooling rate in step S40, in units of deg.c/S;
T coiling Expressed as the coiling temperature in step S40, in degrees c.
TABLE 3
Note: c Acid liquor 1 The acid liquor concentration in the first stage of acid washing is shown as g/L;
C 2 to 4 portions of acid liquor The acid liquor concentration in g/L when the second section, the third section and the fourth section are subjected to acid washing is shown;
C corrosion inhibitor 4 The concentration of the corrosion inhibitor in the fourth stage of pickling is expressed in g/L;
C acid liquor 5 The acid liquor concentration in the fifth stage of acid washing is expressed as g/L;
C corrosion inhibitor 5 The concentration of the corrosion inhibitor in the fifth stage of pickling is expressed in g/L;
R 3 the pickling speed in m/min was shown for the fourth pickling and the fifth pickling.
TABLE 4
Steel plate material thickness is a, unit is mm;
the width of the steel plate material is b, and the unit is mm;
R eL represents the yield strength in MPa;
R m expressed as tensile strength in MPa;
a is expressed as elongation in%;
R a expressed as roughness in μm;
L 1 expressed as the scale thickness in μm;
L 2 expressed as grain boundary oxidation thickness in μm.
As can be seen from tables 2 and 3, in the examples, compared with the comparative example, the temperature of the casting blank before heating in comparative example 1 is 615 ℃, the thickness of the intergranular oxidation layer is 7.8 μm, and the depth of the intergranular oxidation layer after acid cleaning is as high as 10.1 μm, so that the whole plate surface is blackened, and the normal use is influenced; at the coiling temperature of 642 ℃ in the comparative example 2, the depth of intergranular oxidation of the coiled steel plate in a high-temperature environment is 8.6 mu m, and the thickness of the iron scale is as high as 14.2 mu m, so that the pickling speed is reduced to 80m/min in order to remove the surface iron scale in the pickling process, the grain boundary of the pickled steel plate is corroded, and the intergranular oxidation depth is increased to 12.5 mu m; comparative example 3 the hot rolling process is substantially the same as the example, the thickness of the scale and the depth of the intergranular oxide layer of the hot rolled plate obtained by the hot rolling process are similar to the results of the example, but in the pickling process, the concentration of the corrosion inhibitor used is low, the pickling speed is slow, the grain boundary after pickling is corroded, the intergranular oxidation of the pickled plate is increased to 8.1 mu m, and simultaneously, the oxygen intrusion concentration is gradually reduced from the edge part to the central part, so the oxygen partial pressure at the edge part of the steel strip is higher, the external oxidation is generated to generate compact scale, the over pickling in the pickling process of the steel plate is protected, the corrosion to the grain boundary in the pickling process is reduced, and the degree of the intergranular oxidation in the width direction of the steel plate is different, and the chromatic aberration is formed.
To sum up, this application is through chemical composition and the content of reasonable selection pickling plate material, adopts the casting blank high temperature to advance the stove simultaneously, and the layer is cooled down soon after cold to below 600 ℃, and the process of low temperature batching avoids the temperature interval of easy intercrystalline oxidation, in the pickling process, takes acidizing fluid + corrosion inhibitor to and the pickling speed that matches with it, has improved pickling efficiency, and has avoided the colour difference that the face over pickling leads to.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (17)
1. A method of manufacturing pickled plate material, characterized in that the manufacturing method comprises the steps of:
providing a casting blank, wherein the casting blank has the following chemical composition in percentage by mass:
carbon: 0.20 to 0.24 percent;
silicon: 0.20 to 0.40 percent;
manganese: 1.00% -1.30%;
phosphorus: less than 0.015 percent;
sulfur: 0.005% or less;
chromium: 0.15 to 0.35 percent;
titanium: 0.02% -0.04%;
boron: 0.0025 to 0.004 percent;
nitrogen: less than 0.004%;
acid-soluble aluminum: 0.01% to 0.06%, and
the balance iron and impurities;
wherein the carbon content [% carbon ], the manganese content [% manganese ], the chromium content [% chromium ], and the boron content [% boron ] satisfy the following relationships:
5.72 percent to 19.4[% carbon ] +0.88[% manganese ] + [% chromium ] +88.4[% boron ] < 5.91%;
feeding the casting blank into a heating furnace at 800-950 ℃;
rolling the heated casting blank to obtain a steel strip;
cooling the steel strip at a first stage cooling rate R 1 ＝v 1 +k 1 ×a 1/2 Cooling to a temperature of 580-600 ℃, and then cooling at a second stage cooling rate R 2 ＝v 2 +k 2 ×a 1/2 Cooling to coiling temperature T Coiling ＝T+k×a 1/2 X b is in T Coiling Coiling under the condition to obtain a hot rolled steel plate material;
pickling, rinsing, drying and oiling the hot-rolled steel plate material to obtain a pickled plate material;
wherein R is 1 Represents the first stage cooling rate in ℃/s;
v 1 60-80 ℃/s;
a represents the thickness of the hot-rolled steel sheet material in mm;
k 1 correction factor, k, representing the first stage cooling rate 1 Is 29.4 ℃/(s.mm) 1/2 )；
R 2 Represents the second stage cooling rate in ℃/s;
v 2 is 10 ℃/s to 30 ℃/s;
k 2 correction factor, k, representing the second stage cooling rate 2 At 8.6 ℃/(s.mm) 1/2 )；
T Coiling Represents the coiling temperature in units of ℃;
t is 410-430 ℃;
k represents a correction coefficient of the coiling temperature, and k is 26.2X 10 -3 ℃/mm 3/2 ；
b represents the width of the hot rolled steel sheet material in mm.
2. The production method according to claim 1, wherein the chemical composition of the cast slab is a composition in which phosphorus: 0.006 percent to 0.013 percent.
3. The production method according to claim 1, wherein the chemical composition of the cast slab is a composition in which, in terms of mass percentage, sulfur: 0.0018 to 0.0038 percent.
4. The production method according to claim 1, wherein the chemical composition of the cast slab is a composition in which, in terms of mass percentage, nitrogen: 0.0021 to 0.0038 percent.
5. The manufacturing method according to claim 1, wherein the providing a casting slab includes:
providing a raw material having the chemical composition of claim 1;
and smelting, refining and continuously casting the raw materials in sequence to obtain a casting blank, wherein the mass ratio of calcium to sulfur in the refining silicon-calcium treatment process is 1.0-3.0.
6. The method according to claim 5, wherein the reduction amount of the cast slab is 5mm to 15mm in the continuous casting treatment of the cast slab.
7. The manufacturing method according to claim 1, wherein the heating furnace comprises a preheating section, a first heating section, a second heating section, and a soaking section, wherein the temperatures of the second heating section and the soaking section are each 1160 ℃ to 1220 ℃.
8. The manufacturing method according to any one of claims 1 to 7, wherein the rolling of the heated cast slab to obtain a steel strip includes:
and sequentially carrying out rough rolling and finish rolling treatment on the heated casting blank, wherein the finish rolling finishing temperature is 840-900 ℃.
9. The method of claim 1, wherein the pickling comprises a first pickling section, a second pickling section, a third pickling section, a fourth pickling section, and a fifth pickling section, wherein a corrosion inhibitor is added to the fourth pickling section and the fifth pickling section to cooperate with the acid pickling section.
10. The production method according to claim 9, wherein the temperature of the acid washing is 70 ℃ to 85 ℃.
11. The method according to claim 9, wherein a concentration of the acid solution in the first pickling is 30 to 40g/L.
12. The method according to claim 9, wherein the acid solution has a concentration of 70 to 90g/L in the second-stage pickling, the third-stage pickling, and the fourth-stage pickling.
13. The production method according to claim 9, wherein the acid solution has a concentration of 130 to 150g/L in the fifth pickling.
14. The manufacturing method according to claim 9, wherein the concentration of the corrosion inhibitor in the fourth pickling section is 30 to 40% of the concentration of the corrosion inhibitor in the fifth pickling section.
15. The method of claim 9, wherein the concentration of the corrosion inhibitor in the fifth acid washing stage is 0.03 to 0.04g/L.
16. The method of claim 9, wherein the pickling speed R is higher in the fourth pickling and the fifth pickling 3 ＝v 3 +k 3 ×C Acid liquor /C Corrosion inhibitor 3/2 ；
Wherein R is 3 The pickling speed is expressed in the unit of m/min;
v 3 40m/min to 50m/min;
k 3 correction coefficient, k, representing pickling speed 3 Is 3.18X 10 -3 m·g 1/2 /(s·L 1/2 )；
C Acid liquor The concentration of the acid liquor is expressed in g/L;
C corrosion inhibitor The concentration of the corrosion inhibitor is expressed in g/L.
17. An article produced using the pickled sheet material produced by the production method according to any one of claims 1 to 16.
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