WO2022139355A1 - 인산염 반응성이 우수한 강판 및 이의 제조방법 - Google Patents
인산염 반응성이 우수한 강판 및 이의 제조방법 Download PDFInfo
- Publication number
- WO2022139355A1 WO2022139355A1 PCT/KR2021/019331 KR2021019331W WO2022139355A1 WO 2022139355 A1 WO2022139355 A1 WO 2022139355A1 KR 2021019331 W KR2021019331 W KR 2021019331W WO 2022139355 A1 WO2022139355 A1 WO 2022139355A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- steel sheet
- reactivity
- phosphate
- less
- cold
- Prior art date
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 125
- 239000010959 steel Substances 0.000 title claims abstract description 125
- 238000004519 manufacturing process Methods 0.000 title claims description 31
- 239000011572 manganese Substances 0.000 claims abstract description 40
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 16
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 14
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 11
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000010703 silicon Substances 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims abstract description 8
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000011574 phosphorus Substances 0.000 claims abstract description 7
- 238000000921 elemental analysis Methods 0.000 claims abstract description 4
- 229910019142 PO4 Inorganic materials 0.000 claims description 83
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 82
- 239000010452 phosphate Substances 0.000 claims description 82
- 230000009257 reactivity Effects 0.000 claims description 58
- 238000000137 annealing Methods 0.000 claims description 27
- 230000007797 corrosion Effects 0.000 claims description 27
- 238000005260 corrosion Methods 0.000 claims description 27
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 22
- 239000010960 cold rolled steel Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 20
- 239000002245 particle Substances 0.000 claims description 15
- 229910001567 cementite Inorganic materials 0.000 claims description 14
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 claims description 14
- 235000021110 pickles Nutrition 0.000 claims description 14
- 238000005096 rolling process Methods 0.000 claims description 12
- 239000007864 aqueous solution Substances 0.000 claims description 10
- 238000005097 cold rolling Methods 0.000 claims description 10
- 238000005098 hot rolling Methods 0.000 claims description 9
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- 229910000859 α-Fe Inorganic materials 0.000 claims description 5
- 238000005336 cracking Methods 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 235000021317 phosphate Nutrition 0.000 description 69
- 230000000052 comparative effect Effects 0.000 description 34
- 239000002253 acid Substances 0.000 description 23
- 239000013078 crystal Substances 0.000 description 9
- 238000007654 immersion Methods 0.000 description 8
- 239000000203 mixture Substances 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000010828 elution Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 4
- 238000005238 degreasing Methods 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- SPDJAIKMJHJYAV-UHFFFAOYSA-H trizinc;diphosphate;tetrahydrate Chemical compound O.O.O.O.[Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O SPDJAIKMJHJYAV-UHFFFAOYSA-H 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052827 phosphophyllite Inorganic materials 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 3
- 229910000165 zinc phosphate Inorganic materials 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 238000007792 addition Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000004611 spectroscopical analysis Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 241000219307 Atriplex rosea Species 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 229910017135 Fe—O Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000010349 cathodic reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
-
- 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
- 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
- C21D8/0236—Cold rolling
-
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
-
- 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
- C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
- C21D8/0284—Application of a separating or insulating coating
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/02—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using non-aqueous solutions
- C23C22/03—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using non-aqueous solutions containing phosphorus compounds
-
- 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
- C23G1/081—Iron or steel solutions containing H2SO4
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/003—Cementite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
Definitions
- One embodiment of the present invention relates to a steel sheet having excellent phosphate reactivity and a method for manufacturing the same.
- the size of the phosphate crystals generated on the surface after the phosphating treatment is fine and evenly over the entire surface of the steel sheet. It relates to a steel sheet having excellent corrosion resistance and phosphate-treated surface characteristics, characterized in that it is distributed, and a method for manufacturing the same.
- Phosphate treatment is performed on the surface of steel materials to secure rust resistance, improve long-term corrosion resistance, and at the same time improve adhesion before painting during painting.
- phosphating treatment an electrochemical potential difference is generated during the contact process between the phosphate solution and the steel sheet, and the steel sheet is dissolved and Fe is ionized to generate electrons. It means a treatment formed on the surface by a method.
- Phosphating is a process to impart paintability and corrosion resistance to original plates such as automobile steel plates, drum steel plates, and electrical steel plates.
- the solution used for phosphating is zinc phosphate, and after phosphating, it has a crystal structure of two phases of phosphophyllite and Hopeite, or a mixture of two phases, depending on the crystal shape of the phosphate formed on the surface of the steel sheet.
- Phosphophyllite is a spherical, dense crystal that is formed when Fe ions are present in the phosphate crystal and react together.
- Phosphophyllite (P) has better corrosion resistance to acid or alkali than Hopeite (H), and the result of phosphate treatment with a relatively high P fraction has better corrosion resistance. For this reason, when following the immersion treatment method, which is a condition in which iron eluted from the steel sheet is easily contained in the film, the ratio of P on the surface is increased.
- Whether or not the phosphating property is good or bad is ultimately determined by how densely the phosphate crystals cover the surface of the steel sheet after the phosphating process, and the size and coverage of the phosphate crystals determine this.
- the factors inhibiting the acid reactivity of a steel plate are generally the type and thickness of oxides covering the surface of the steel plate.
- the oxide is formed thickly, the elution rate of Fe for the growth of phosphate nuclei, which is the nuclei of phosphate, is slowed, and the density of phosphate nuclei is lowered. There is a characteristic.
- the concentration of the phosphating solution gradually becomes thinner, and there is a problem that the phosphating treatment does not occur smoothly.
- the steel sheet In order for the phosphate to be well applied to the surface of the steel sheet, the steel sheet must react with phosphoric acid to form high-density phosphate nuclei at a fast rate. There is a problem that inhibits the formation of nuclei, which causes the phosphate crystals to coarsen and not cover the entire surface of the steel. That is, if sufficient reactivity is not secured even at a low phosphoric acid concentration, there is a problem that adversely affects the phosphating property.
- An embodiment of the present invention provides a steel sheet having excellent phosphate reactivity and a method for manufacturing the same.
- the size of the phosphate crystals generated on the surface after the phosphating treatment is fine and evenly over the entire surface of the steel sheet.
- the steel sheet having excellent phosphate reactivity is, by weight, carbon (C): 0.02 to 0.06%, silicon (Si): 0.01% or less (excluding 0%), manganese (Mn): 0.1 to 0.24%, aluminum (Al): 0.02% or less (excluding 0%), phosphorus (P): 0.015 to 0.04%, and the balance iron (Fe) and unavoidable impurities.
- an oxide layer having a thickness of 10 nm or less is present from the surface to the inner direction of the steel sheet, and the following Equation 1 is satisfied.
- the steel sheet having excellent phosphate reactivity according to an embodiment of the present invention may contain 2% or more of cementite as an area fraction, and the remainder may contain ferrite.
- the pickle lag time may be 20 seconds or less when the steel sheet is immersed in 5% sulfuric acid aqueous solution at 30°C.
- the steel sheet having excellent phosphate reactivity according to an embodiment of the present invention may have a corrosion loss ratio of 0.55 mg/cm 2 /hr or more when the steel sheet is immersed in a 5% aqueous solution of sulfuric acid at 30°C.
- the steel sheet having excellent phosphate reactivity according to an embodiment of the present invention may have a yield strength of 220 to 270 MPa.
- the average long axis length of the phosphate particles formed after phosphate treatment may be 10 ⁇ m or less.
- phosphate particles may occupy 90 area% or more of the surface of the steel sheet after phosphate treatment.
- the method for manufacturing a steel sheet having excellent phosphate reactivity is, by weight, carbon (C): 0.02 to 0.06%, silicon (Si): 0.01% or less (excluding 0%), manganese (Mn) ): 0.1 to 0.24%, aluminum (Al): 0.02% or less (excluding 0%), phosphorus (P): 0.015 to 0.04%, and the remainder iron (Fe) and unavoidable impurities.
- manufacturing a steel plate manufacturing a cold-rolled steel sheet by cold-rolling a hot-rolled steel sheet; annealing the cold-rolled steel sheet; and temper rolling the annealed cold-rolled steel sheet.
- the coiling temperature is 650 to 650° C.
- the cracking temperature is 700 to 780° C. in the annealing step, and a step of temper rolling is performed.
- the final hot-rolling temperature may be 800 to 950 °C.
- the reduction ratio may be 70 to 85%.
- the cold-rolled steel sheet After the step of annealing the cold-rolled steel sheet, it may be cooled to a final cooling temperature of 80 to 150° C. before the step of temper rolling.
- the annealing step it may be annealed in an atmosphere containing 5% by volume or more of hydrogen and the remaining nitrogen and a dew point of -30°C or less.
- the steel sheet having excellent phosphate reactivity according to an embodiment of the present invention can be effectively used as a raw material for a steel sheet subjected to phosphate treatment in order to impart paintability and rust prevention properties to the steel sheet.
- the steel sheet having excellent phosphate reactivity according to an embodiment of the present invention can easily secure phosphating properties even at a low phosphoric acid concentration, and can be used not only for containers but also for automobiles and home appliances.
- FIG. 1 is a schematic cross-sectional view of a steel plate according to an embodiment of the present invention.
- Example 2 is a photograph of the outer surface of the steel sheets prepared in Example 1 and Comparative Example 4 after phosphate treatment was analyzed with a scanning electron microscope (SEM).
- first, second and third etc. are used to describe, but are not limited to, various parts, components, regions, layers and/or sections. These terms are used only to distinguish one part, component, region, layer or section from another part, component, region, layer or section. Accordingly, a first part, component, region, layer or section described below may be referred to as a second part, component, region, layer or section without departing from the scope of the present invention.
- % means weight %, and 1 ppm is 0.0001 weight %.
- the meaning of further including the additional element means that the remaining iron (Fe) is included by replacing the additional amount of the additional element.
- the steel sheet having excellent phosphate reactivity is, by weight, carbon (C): 0.02 to 0.06%, silicon (Si): 0.01% or less (excluding 0%), manganese (Mn): 0.1 to 0.24%, aluminum (Al): 0.02% or less (excluding 0%), phosphorus (P): 0.015 to 0.04%, and the balance iron (Fe) and unavoidable impurities.
- the elements of the steel sheet will be described in detail.
- Al, Mn, Si, and P in the steel sheet are concentrated in the oxide layer, and have a concentration gradient in the inward direction from the surface.
- the element content in the steel sheet means an average content in the steel sheet thickness direction.
- Carbon (C) 0.02 to 0.06% by weight
- the carbon content of the steel sheet in the present invention may be 0.02 to 0.06 wt%.
- the carbon content in the steel is too small, the secondary phase does not occur and the expected local corrosion phenomenon does not occur.
- the carbon content is too high, the desired strength is exceeded due to excessive carbide formation This can happen. Accordingly, in an embodiment of the present invention, the carbon content is limited to 0.02 to 0.06 wt%. More specifically, it may be 0.025 to 0.055 wt%.
- the silicon content of the steel sheet in the present invention may be 0.01% by weight or less.
- SiO 2 may be formed on the surface, and a complex phase of SiO 2 and Fe oxide may also be formed, causing a large amount of scale.
- red scale may cause a defect that does not fall off during cold rolling pickling, and may form Si oxide itself during cold rolling annealing, which may decrease acid reactivity. Therefore, in an embodiment of the present invention, the maximum content of Si is limited to 0.01 wt% or less. More specifically, it may be 0.001 to 0.01 wt%. More specifically, it may be 0.003 to 0.009 wt%.
- Mn is an element that typically forms oxides on the surface during annealing heat treatment of cold-rolled steel sheets.
- the content of Si which can inhibit acid reactivity by forming a surface oxide in the annealing heat treatment process, is also limited to 0.01 wt % or less, and since the Si oxide itself is an environment in which a large amount of Si oxide can be formed, the Mn content Mn oxide was actively suppressed by controlling the content to 0.24 wt% or less.
- Mn is a representative solid solution strengthening element, and when the content of Mn is too low, strength may decrease. Accordingly, Mn may be included in an amount of 0.10 to 0.24% by weight. More specifically, 0.11 to 0.24% by weight may be included.
- Al is an element used as a representative deoxidizer. However, in an embodiment of the present invention, Al also forms Al oxide on the surface of the steel, and when Al oxide is formed, acid reactivity may be inhibited. Accordingly, Al may be included in an amount of 0.020 wt% or less. More specifically, it may include 0.001 to 0.020 wt%. More specifically, it may contain 0.010 to 0.019 wt%.
- P acts to cause an elution reaction of Fe when the steel is subjected to an acid environment. Therefore, the content of P may be limited to 0.015% by weight or more.
- P is an element causing typical room temperature brittleness, and since Fe 3 P may make the formability weak when precipitated at the grain boundary, the upper limit thereof may be limited to 0.040 wt%. Therefore, P may be included in an amount of 0.015 to 0.040 wt%. More specifically, 0.016 to 0.038 wt% may be included.
- the present invention contains Fe and unavoidable impurities. Since unavoidable impurities are widely known in the art, a detailed description thereof will be omitted. In one embodiment of the present invention, the addition of effective components other than the above components is not excluded, and when additional components are further included, the remaining Fe is included.
- FIG. 1 shows a schematic diagram of a cross-section in the thickness direction of a steel sheet according to an embodiment of the present invention.
- the oxide layer 20 is present from the surface of the steel plate to the inner direction of the steel plate.
- the oxide layer 20 is present only on one surface of the steel sheet, but it is also possible that the oxide layer 20 is present on both surfaces.
- the oxide layer 20 means from the surface of the steel sheet to the depth at which the oxygen peak becomes '0' in the diagram of Fe-O shown as a result of GDS.
- the thickness of the oxide layer 20 may be 10.0 nm or less. If the thickness of the oxide layer 20 is too thick, the acid reactivity may be slowed, which may not be appropriate. More specifically, the thickness of the oxide layer 20 may be 1 to 10.0 nm.
- components such as Mn, Si, Al, and P contained in the steel sheet diffuse from the inside of the steel sheet to the surface of the steel sheet and are concentrated in the oxide layer 20 .
- the content of Mn, Si, Al, and P present in the oxide layer 20 may satisfy Equation 1 below.
- Equation 1 exceeds 0.6, P in the oxide layer is small or the content of Mn, Si, and Al is high. When there is little P in an oxide layer, P which is an acid reactivity ensuring element decreases, and suitable phosphate reactivity cannot be obtained. In addition, when the content of Mn, Si, and Al is large, oxides of Mn, Si, and Al are formed in large amounts, and proper phosphate reactivity cannot be obtained. Therefore, as described above, the content of Equation 1 may be 0.60 or less. More specifically, the value of Equation 1 may be 0.20 to 0.60.
- the maximum content of P in the oxide layer 20 is 1.0 to 3.0% by weight, the maximum content of Mn is 0.80 to 1.5% by weight, the maximum content of Si is 0.50 to 1.50% by weight, and the maximum content of Al is 0.30 to 1.0% by weight. % can be
- the steel sheet having excellent phosphate reactivity according to an embodiment of the present invention may include 2% or more of cementite as an area fraction, and the remainder may include ferrite.
- the phenomenon that causes corrosion in acid reaction is known to form a small circuit in the electrolyte.
- acid reaction does not occur rather than cathodic sites such as cementite. reaction can be accelerated.
- it may contain 2.0 to 5.0 area% of cementite.
- Other phases may further include 0.5 area% or less.
- the steel sheet has excellent phosphate reactivity, excellent corrosion resistance, has an appropriate yield strength, and has excellent productivity.
- the phosphate reactivity is measured through Pickle lag (P/L) measurement.
- P/L Pickle lag
- the pickle lag time may be 20 seconds or less when the steel sheet is immersed in a 5% aqueous solution of sulfuric acid at 30°C. More specifically, the Pickle lag time may be 5 to 20 seconds.
- the time is measured by observing the surface of the steel plate with a camera, but in the case of a fine hydrogen gas that is not visually visible, there is an aspect that is not measured.
- the phosphate reactivity is quantified by measuring the initial weight of the specimen and the final weight of the specimen as an item called the corrosion loss ratio divided by the immersion time and the immersion area. That is, the corrosion loss ratio is an indicator of acid reactivity and is a value indicating how quickly Fe ions are eluted when the steel sheet is exposed to an acid environment of a certain concentration. In other words, it can be said that the higher the corrosion reduction ratio, the easier the elution of Fe and the easier phosphate nucleation.
- the corrosion loss ratio when immersed in 5% sulfuric acid aqueous solution at 30° C. may be 0.550 mg/cm 2 /hr or more. More specifically, the corrosion loss ratio may be 0.550 to 0.700 mg/cm 2 /hr.
- the steel sheet may have a yield strength of 220 to 270 MPa. If the yield strength is too high, the formability may be a problem, and if the yield strength is too low, a problem may occur in terms of pressure resistance and dent resistance.
- the steel sheet according to an embodiment of the present invention has easy phosphate treatment, and after the phosphate treatment, fine phosphates having an average long axis of phosphate particles of 10 ⁇ m or less may exist on the surface of the steel sheet, and 90 of the total area of the observation surface % or more can be covered.
- the phosphate particles formed in the present invention are mainly lobed Hopeite particles.
- the length of the long axis of the Hopeite particle is defined as the length of the longest axis when a single phosphate particle is observed in the observation plane.
- the average of the measured values may be calculated.
- the observation surface may be a surface parallel to the rolling surface (ND surface).
- the phosphating treatment means applying a zinc-based phosphate solution to the steel sheet and then treating the steel sheet at a temperature of 30 to 40° C. for 60 to 120 seconds. More specifically, phosphating refers to forming and processing a steel sheet according to its intended use, then going through a degreasing process to remove the oil applied to the surface, and after surface adjustment, a zinc phosphate solution is applied by immersion or spray type 30 It means to treat for 60 to 120 seconds at a temperature of 40 ° C.
- a method of manufacturing a steel sheet having excellent phosphate reactivity includes the steps of: preparing a hot-rolled steel sheet by hot rolling a slab; manufacturing a cold-rolled steel sheet by cold-rolling a hot-rolled steel sheet; annealing the cold-rolled steel sheet; and temper rolling the annealed cold-rolled steel sheet.
- a slab is hot-rolled to manufacture a hot-rolled steel sheet.
- the alloy composition of the slab has been described in the above-described steel sheet, the overlapping description will be omitted. Since the alloy composition is not substantially changed during the manufacturing process of the steel sheet, the alloy composition of the steel sheet and the alloy composition of the slab are substantially the same.
- the slab can be heated before hot rolling.
- the heating temperature of the slab can be 1200 °C or more. Since most of the precipitates present in the steel must be re-dissolved, a temperature of 1200° C. or higher may be required. More specifically, the slab heating temperature may be 1250 °C or more.
- the final hot rolling temperature may be 800 to 950 °C. More specifically, it may be 850 to 930 °C.
- the coiling temperature may be 650 to 650 °C.
- the coiling temperature affects the fraction of abnormalities such as cementite other than the single phase of ferrite, and the higher the coiling temperature, the higher the fraction of cementite.
- Properly controlled cementite fraction can act favorably to improve phosphate reactivity.
- the hot-rolled steel sheet is cold-rolled to manufacture a cold-rolled steel sheet.
- the reduction ratio may be 70 to 85%.
- the surface ⁇ -fiber texture is maximized, which is advantageous for phosphate reactivity.
- the cold-rolled steel sheet is annealed.
- the cracking temperature may be 700 to 780 °C.
- the lower the annealing temperature the less the fraction of oxides formed on the surface of the steel has the effect of reducing acid reactivity.
- an appropriate lower limit temperature is required.
- the annealing step it may be annealed in an atmosphere containing 5% by volume or more of hydrogen and the remaining nitrogen and a dew point of -30°C or less.
- an atmosphere containing 5% by volume or more of hydrogen and the remaining nitrogen and a dew point of -30°C or less By managing the annealing atmosphere at a reducing and low dew point temperature, oxides formed on the surface can be suppressed as much as possible.
- the annealed cold rolled steel sheet is temper rolled.
- the temper rolling may be performed at a reduction ratio of 1.0 to 3.0%.
- a more suitable reduction ratio varies in proportion to the thickness of the specimen, but may be 1.0 to 2.0%.
- the cold-rolled steel sheet After the step of annealing the cold-rolled steel sheet, it may be cooled to a final cooling temperature of 80 to 150° C. before the step of temper rolling.
- the lower the final cooling temperature the more advantageous, but it can be cooled to 90°C to 120°C under operating conditions.
- a cold rolled steel sheet was prepared by hot rolling, cold rolling, annealing and temper rolling of a slab having the composition shown in Table 1 below.
- the coiling temperature was fixed at 700 °C
- the cold rolling reduction was 80%
- the annealing temperature was 760 °C
- the final cooling temperature after annealing was 100 °C.
- the temper rolling reduction ratio was adjusted to 1.5%, so that the final thickness was 1.0mm.
- the hydrogen concentration was controlled to 4.5% and the dew point was controlled to -40°C.
- the final manufactured cold-rolled sheet was analyzed by GDS analysis, and the results are shown in Table 1. In addition, the index of the surface element shown in Equation 1 is also shown.
- GDS analysis was compared by measuring at a scan rate of 1000 points per second by applying a potential of 21 W at a voltage of 700 V and a current of 30 mA according to the Zn Galv RF measurement method. After measuring from the surface to a depth of 0.01 ⁇ m in the thickness direction, the content of each element was calculated using a calibration factor of 0.7.
- the thickness of the oxide layer analyzed through GDS of the manufactured steel sheet and the pickle lag time which is the time it takes for hydrogen bubbles to cover the entire area of the steel sheet after immersion at 30° C. in 5% sulfuric acid, 5 min in the same solution.
- Table 2 shows the unit surface area during immersion, the corrosion loss ratio indicating the amount of corrosion lost per unit time, the yield strength of steel, and the tendency of crack formation in the folding part when folding at 180 degrees.
- Pickle lag (P/L) is formed by surface degreasing of a 75 ⁇ 100 mm specimen in a 5 wt% sulfuric acid aqueous solution with alkali and then confirming the degreasing performance by confirming that the water wettability is 100%, then depositing it on the surface by ion elution of Fe. The degree of formation of H 2 gas was measured, and the time taken for hydrogen gas to cover the entire area was measured.
- the corrosion loss ratio was 5 min by immersing the specimen in 5 wt% of sulfuric acid aqueous solution, and reacting at 30 °C. After lapse, the initial weight of the specimen and the final weight of the specimen were calculated by dividing the immersion time and immersion area.
- the cementite fraction was measured after grinding the surface of the steel sheet, which is the surface to which the phosphate is applied.
- the long axis of the phosphate particles is maintained at a temperature of 30 to 40 ° C for 60 to 120 seconds after the zinc phosphate solution is applied, and the length of the longest axis is measured by observing the single phosphate particles formed on the surface of the steel sheet. did After measuring 30 or more arbitrarily calculated single phosphate particles, the average of the measured values was calculated.
- Example 1 0.04 0.11 0.005 0.018 0.02 1.64 0.65 0.87 0.46 0.40
- Example 2 0.04 0.24 0.005 0.018 0.02 1.55 1.15 1.23 0.38 0.59
- Example 3 0.04 0.15 0.005 0.019 0.02 1.60 0.95 0.78 0.51 0.47
- Example 4 0.04 0.15 0.005 0.018 0.016 1.23 0.86 0.89 0.38 0.58
- Example 5 0.04 0.15 0.005 0.018 0.038 2.64 0.86 0.96 0.43 0.28
- Example 6 0.04 0.15 0.009 0.018 0.02 1.53 0.87 1.36 0.39 0.57
- Example 7 0.025 0.15 0.005 0.018 0.02 1.43 0.95 1.14 0.46 0.59
- Example 8 0.055 0.15 0.005 0.018 0.02 1.50 0.88 1.28 0.48 0.59 Comparative Example 1 0.04 0.07 0.005 0.018 0.02 1.60 0.25 1.28 0.51 0.43
- Comparative Example 4 did not satisfy Equation 1 because the content of P was too small. Since P, which promotes acid reactivity, is not properly included, the pickle lag time becomes long and the corrosion loss ratio becomes small. That is, the phosphate reactivity is inferior.
- Example 2 is a photograph of the outer surface of the steel sheets prepared in Example 1 and Comparative Example 4 after phosphate treatment was analyzed with a scanning electron microscope (SEM).
- Example 1 having a short pickle lag time and a large corrosion loss ratio has a finer size of phosphate particles compared to Comparative Example 4 and is evenly distributed over the entire surface (close to 100%) of the steel sheet.
- a slab having the composition of Example 1 below was subjected to hot rolling, cold rolling, annealing, and temper rolling at a reduction ratio of 1.5% to prepare a cold rolled steel sheet.
- the conditions in each process were adjusted as shown in Table 3 below.
- Example 1 700 760 3.25 7.8 0.40 5.34 13 0.685
- Example 9 660 760 3.01 7.7 0.37 9.85 16.6 0.55
- Example 10 740 760 3.86 7.8 0.48 7.84 18.06 0.625
- Example 11 700 700 3.23 6.6 0.33 4.58 10.8 0.715
- Example 12 700 780 3.24 9 0.51 9.25 18.8 0.58
- Comparative Example 11 700 650 3.23 7.8 0.66 14.25 22 0.538
- Comparative Example 12 700 800 3.23 10.9 0.67 18.58 25.3 0.473
- Comparative Examples 11 and 12 show the degree of influence of the annealing temperature.
- the lower the annealing temperature the less the fraction of oxides formed on the surface of the steel has the effect of reducing acid reactivity, so it is advantageous for acid reactivity. It has the adverse effect of bringing That is, when the annealing temperature is too high or low, the value of Equation 1 is not satisfied, and it can be confirmed that the acid reactivity is lowered.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
Description
C | Mn | Si | Al | P | P | Mn | Si | Al | (Mn+Si+Al) | |
최대함량 | 최대함량 | 최대함량 | 최대함량 | /3×P | ||||||
실시예 1 | 0.04 | 0.11 | 0.005 | 0.018 | 0.02 | 1.64 | 0.65 | 0.87 | 0.46 | 0.40 |
실시예 2 | 0.04 | 0.24 | 0.005 | 0.018 | 0.02 | 1.55 | 1.15 | 1.23 | 0.38 | 0.59 |
실시예 3 | 0.04 | 0.15 | 0.005 | 0.019 | 0.02 | 1.60 | 0.95 | 0.78 | 0.51 | 0.47 |
실시예 4 | 0.04 | 0.15 | 0.005 | 0.018 | 0.016 | 1.23 | 0.86 | 0.89 | 0.38 | 0.58 |
실시예 5 | 0.04 | 0.15 | 0.005 | 0.018 | 0.038 | 2.64 | 0.86 | 0.96 | 0.43 | 0.28 |
실시예 6 | 0.04 | 0.15 | 0.009 | 0.018 | 0.02 | 1.53 | 0.87 | 1.36 | 0.39 | 0.57 |
실시예 7 | 0.025 | 0.15 | 0.005 | 0.018 | 0.02 | 1.43 | 0.95 | 1.14 | 0.46 | 0.59 |
실시예 8 | 0.055 | 0.15 | 0.005 | 0.018 | 0.02 | 1.50 | 0.88 | 1.28 | 0.48 | 0.59 |
비교예 1 | 0.04 | 0.07 | 0.005 | 0.018 | 0.02 | 1.60 | 0.25 | 1.28 | 0.51 | 0.43 |
비교예 2 | 0.04 | 0.25 | 0.005 | 0.018 | 0.02 | 1.55 | 1.56 | 1.48 | 0.43 | 0.75 |
비교예 3 | 0.04 | 0.15 | 0.005 | 0.023 | 0.02 | 1.50 | 0.99 | 0.89 | 0.85 | 0.61 |
비교예 4 | 0.04 | 0.15 | 0.005 | 0.018 | 0.013 | 0.98 | 0.79 | 0.85 | 0.46 | 0.71 |
비교예 5 | 0.04 | 0.15 | 0.005 | 0.018 | 0.043 | 3.40 | 0.83 | 0.68 | 0.43 | 0.19 |
비교예 6 | 0.04 | 0.15 | 0.015 | 0.018 | 0.02 | 1.58 | 0.81 | 2.45 | 0.41 | 0.77 |
비교예 7 | 0.015 | 0.15 | 0.005 | 0.018 | 0.02 | 1.60 | 0.89 | 0.59 | 0.4 | 0.39 |
비교예 8 | 0.065 | 0.15 | 0.005 | 0.018 | 0.02 | 1.48 | 0.82 | 0.87 | 0.39 | 0.47 |
세멘타이트 분율(%) |
산화층 두께 (nm) |
Pickle lag time (sec.) |
부식감량비 (mg/cm2/hr.) |
항복강도 (MPa) |
180도 folding Crack 경향 |
인산염 입자 장축 길이 (㎛) |
|
발명예1 | 3.25 | 7.8 | 13 | 0.685 | 222 | X | 5.34 |
발명예2 | 3.22 | 9.3 | 19 | 0.573 | 248 | X | 8.23 |
발명예3 | 3.24 | 8.9 | 16 | 0.639 | 242 | X | 6.25 |
발명예4 | 3.25 | 9.5 | 20 | 0.565 | 232 | X | 9.80 |
발명예5 | 3.24 | 7.5 | 11 | 0.735 | 265 | X | 3.28 |
발명예6 | 3.15 | 9.8 | 17 | 0.628 | 234 | X | 8.45 |
발명예7 | 2.18 | 9.5 | 18 | 0.593 | 221 | X | 9.23 |
발명예8 | 4.25 | 9.1 | 15 | 0.635 | 269 | X | 6.34 |
비교예1 | 3.25 | 7.7 | 12 | 0.674 | 212 | X | 5.68 |
비교예2 | 3.21 | 11.2 | 22 | 0.528 | 252 | X | 15.85 |
비교예3 | 3.14 | 10.8 | 21 | 0.529 | 248 | X | 13.45 |
비교예4 | 3.05 | 13.5 | 32 | 0.475 | 222 | X | 17.46 |
비교예5 | 3.15 | 7.3 | 9 | 0.706 | 274 | O | 4.85 |
비교예6 | 3.14 | 10.5 | 22 | 0.515 | 237 | X | 16.84 |
비교예7 | 1.85 | 11.8 | 24 | 0.498 | 207 | X | 15.23 |
비교예8 | 4.85 | 9.6 | 23 | 0.538 | 272 | O | 14.28 |
권취 온도 (℃) |
소둔 온도 (℃) |
세멘타이트 분율 (%) |
산화층 두께 (nm) |
(Mn+Si+Al) /3×P |
인산염 장축 길이 (㎛) |
Pickle lag 시간 (sec,) |
부식감량비 (mg/cm2/hr.) |
|
실시예 1 | 700 | 760 | 3.25 | 7.8 | 0.40 | 5.34 | 13 | 0.685 |
실시예 9 | 660 | 760 | 3.01 | 7.7 | 0.37 | 9.85 | 16.6 | 0.55 |
실시예 10 | 740 | 760 | 3.86 | 7.8 | 0.48 | 7.84 | 18.06 | 0.625 |
실시예 11 | 700 | 700 | 3.23 | 6.6 | 0.33 | 4.58 | 10.8 | 0.715 |
실시예 12 | 700 | 780 | 3.24 | 9 | 0.51 | 9.25 | 18.8 | 0.58 |
비교예 9 | 630 | 760 | 1.68 | 7.8 | 0.36 | 15.85 | 22.5 | 0.528 |
비교예 10 | 760 | 760 | 4.35 | 7.8 | 0.61 | 13.55 | 21.5 | 0.546 |
비교예 11 | 700 | 650 | 3.23 | 7.8 | 0.66 | 14.25 | 22 | 0.538 |
비교예 12 | 700 | 800 | 3.23 | 10.9 | 0.67 | 18.58 | 25.3 | 0.473 |
Claims (11)
- 중량%로, 탄소(C): 0.02 내지 0.06%, 실리콘(Si): 0.01% 이하 (0%는 제외함), 망간 (Mn): 0.1 내지 0.24%, 알루미늄 (Al): 0.02% 이하 (0%는 제외함), 인 (P): 0.015 내지 0.04% 및 잔부 철(Fe) 및 불가피한 불순물을 포함하고,표면으로부터 강판 내부 방향으로 10nm 이하의 두께를 갖는 산화층이 존재하고,하기 식 1을 만족하고,세멘타이트를 면적분율로 2% 이상 포함하고, 나머지는 페라이트를 포함하는 인산염 반응성이 우수한 강판.[식 1]([Mn] + [Si] + [Al]) / (3 × [P]) ≤ 0.60(식 1에서 [Mn], [Si], [Al] 및 [P]는 산화층을 두께 방향으로 원소 분석 할 때, 각 원소의 최대 함량을 의미한다.)
- 제1항에 있어서,강판을 5% 황산 수용액, 30℃에 침지 시 Pickle lag 시간이 20초 이하인 인산염 반응성이 우수한 강판.
- 제1항에 있어서,강판을 5% 황산 수용액, 30℃에 침지 시 부식 감량비가 0.55 mg/cm2/hr 이상인 인산염 반응성이 우수한 강판.
- 제1항에 있어서,항복 강도가 220 내지 270MPa인 인산염 반응성이 우수한 강판.
- 제1항에 있어서,인산염처리 후 형성된 인산염 입자의 평균 장축 길이가 10㎛ 이하인 인산염 반응성이 우수한 강판.
- 제1항에 있어서,인산염처리 후 형성된 인산염 입자가 강판 표면의 90 면적% 이상을 점유하는 인산염 반응성이 우수한 강판.
- 중량%로, 탄소(C): 0.02 내지 0.06%, 실리콘(Si): 0.01% 이하 (0%는 제외함), 망간 (Mn): 0.1 내지 0.24%, 알루미늄 (Al): 0.02% 이하 (0%는 제외함), 인 (P): 0.015 내지 0.04% 및 잔부 철(Fe) 및 불가피한 불순물을 포함하는 슬라브를 열간 압연하여 열연강판을 제조하는 단계;상기 열연강판을 냉간압연 하여 냉연강판을 제조하는 단계;상기 냉연강판을 소둔하는 단계; 및상기 소둔된 냉연강판을 조질 압연 하는 단계를 포함하고,상기 열연강판을 제조하는 단계에서 권취온도가 650 내지 650℃이고,상기 소둔하는 단계에서 균열 온도가 700 내지 780℃인 인산염 반응성이 우수한 강판의 제조 방법.
- 제7항에 있어서,상기 열연강판을 제조하는 단계에서,최종열간압연온도 (FDT)가 800 내지 950℃인 인산염 반응성이 우수한 강판의 제조 방법.
- 제7항에 있어서,상기 냉간압연 하여 냉연강판을 제조하는 단계;에서,압하율이 70 내지 85%인 인산염 반응성이 우수한 강판의 제조 방법.
- 제7항에 있어서,상기 냉연강판을 소둔하는 단계 이후, 상기 조질 압연하는 단계 이전에최종냉각온도인 80 내지 150℃까지 냉각하는 인산염 반응성이 우수한 강판의 제조 방법.
- 제7항에 있어서,상기 소둔하는 단계에서 수소 5 부피% 이상 및 나머지 질소를 포함하는 분위기 및 이슬점 -30℃ 이하에서 소둔하는 인산염 반응성이 우수한 강판의 제조 방법.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202180093866.XA CN116848280A (zh) | 2020-12-21 | 2021-12-17 | 磷酸盐反应性优异的钢板及其制造方法 |
US18/268,571 US20240043955A1 (en) | 2020-12-21 | 2021-12-17 | Steel sheet with excellent phosphatability and manufacturing method therefor |
JP2023538162A JP2024500471A (ja) | 2020-12-21 | 2021-12-17 | リン酸塩反応性に優れた鋼板およびその製造方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020200179598A KR102493773B1 (ko) | 2020-12-21 | 2020-12-21 | 인산염 반응성이 우수한 강판 및 이의 제조방법 |
KR10-2020-0179598 | 2020-12-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022139355A1 true WO2022139355A1 (ko) | 2022-06-30 |
Family
ID=82158107
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/KR2021/019331 WO2022139355A1 (ko) | 2020-12-21 | 2021-12-17 | 인산염 반응성이 우수한 강판 및 이의 제조방법 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20240043955A1 (ko) |
JP (1) | JP2024500471A (ko) |
KR (1) | KR102493773B1 (ko) |
CN (1) | CN116848280A (ko) |
WO (1) | WO2022139355A1 (ko) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR920014947A (ko) * | 1991-01-25 | 1992-08-26 | 사이도오 히로시 | 프레스 성형성과 인산염 처리성이 우수한 니켈 전기 도금 냉연 강판 및 그 제조방법 |
JP2810245B2 (ja) * | 1991-01-25 | 1998-10-15 | 日本鋼管株式会社 | プレス成形性および燐酸塩処理性に優れた冷延鋼板およびその製造方法 |
JP2006265682A (ja) * | 2005-03-25 | 2006-10-05 | Jfe Steel Kk | 化成処理性に優れた冷延鋼板の製造方法 |
JP2017145471A (ja) * | 2016-02-18 | 2017-08-24 | 新日鐵住金株式会社 | 鋼板およびその製造方法 |
WO2020095682A1 (ja) * | 2018-11-09 | 2020-05-14 | Jfeスチール株式会社 | ジルコニウム系化成処理用冷延鋼板およびその製造方法ならびにジルコニウム系化成処理鋼板およびその製造方法 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5907055B2 (ja) * | 2012-12-14 | 2016-04-20 | Jfeスチール株式会社 | 溶融亜鉛めっき鋼板 |
JP6198011B2 (ja) | 2014-12-12 | 2017-09-20 | Jfeスチール株式会社 | 硬質容器用鋼板の製造方法 |
KR102119970B1 (ko) * | 2018-11-14 | 2020-06-05 | 주식회사 포스코 | 표면품질과 연속생산성이 우수한 고강도 냉연강판과 이의 제조방법 |
-
2020
- 2020-12-21 KR KR1020200179598A patent/KR102493773B1/ko active IP Right Grant
-
2021
- 2021-12-17 US US18/268,571 patent/US20240043955A1/en active Pending
- 2021-12-17 JP JP2023538162A patent/JP2024500471A/ja active Pending
- 2021-12-17 CN CN202180093866.XA patent/CN116848280A/zh active Pending
- 2021-12-17 WO PCT/KR2021/019331 patent/WO2022139355A1/ko active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR920014947A (ko) * | 1991-01-25 | 1992-08-26 | 사이도오 히로시 | 프레스 성형성과 인산염 처리성이 우수한 니켈 전기 도금 냉연 강판 및 그 제조방법 |
JP2810245B2 (ja) * | 1991-01-25 | 1998-10-15 | 日本鋼管株式会社 | プレス成形性および燐酸塩処理性に優れた冷延鋼板およびその製造方法 |
JP2006265682A (ja) * | 2005-03-25 | 2006-10-05 | Jfe Steel Kk | 化成処理性に優れた冷延鋼板の製造方法 |
JP2017145471A (ja) * | 2016-02-18 | 2017-08-24 | 新日鐵住金株式会社 | 鋼板およびその製造方法 |
WO2020095682A1 (ja) * | 2018-11-09 | 2020-05-14 | Jfeスチール株式会社 | ジルコニウム系化成処理用冷延鋼板およびその製造方法ならびにジルコニウム系化成処理鋼板およびその製造方法 |
Also Published As
Publication number | Publication date |
---|---|
US20240043955A1 (en) | 2024-02-08 |
JP2024500471A (ja) | 2024-01-09 |
KR102493773B1 (ko) | 2023-01-30 |
CN116848280A (zh) | 2023-10-03 |
KR20220089190A (ko) | 2022-06-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2020130631A1 (ko) | 전기 저항 점용접성이 우수한 고강도 아연도금강판 및 그 제조방법 | |
EP3744870B1 (en) | Grain oriented electrical steel sheet | |
WO2020116876A2 (ko) | 수소취성에 대한 저항성이 우수한 열간 프레스 성형 부재 및 그 제조방법 | |
US20230257860A1 (en) | Method of producing a non-oriented electrical steel sheet | |
WO2021112584A1 (ko) | 표면품질과 점 용접성이 우수한 아연도금강판 및 그 제조방법 | |
WO2022139355A1 (ko) | 인산염 반응성이 우수한 강판 및 이의 제조방법 | |
WO2020067702A1 (ko) | 내피쉬스케일이 우수한 법랑용 냉연 강판 및 그 제조 방법 | |
WO2020111883A1 (ko) | 수소지연파괴특성 및 점용접성이 우수한 열간 프레스용 철-알루미늄계 도금 강판 및 그 제조방법 | |
WO2022124825A1 (ko) | 도금품질이 우수한 고강도 용융아연도금강판, 도금용 강판 및 이들의 제조방법 | |
WO2022124826A1 (ko) | 도금품질이 우수한 고강도 용융아연도금강판, 도금용 강판 및 이들의 제조방법 | |
WO2022234901A1 (ko) | (001) 집합조직으로 구성된 전기강판 및 그의 제조방법 | |
WO2022139314A1 (ko) | 무방향성 전기강판 및 그 제조방법 | |
WO2024136359A1 (ko) | 부재 및 그 제조방법 | |
WO2020111884A1 (ko) | 수소지연파괴특성 및 점용접성이 우수한 열간 프레스용 알루미늄계 도금 강판 및 그 제조방법 | |
WO2020111739A2 (ko) | 법랑용 냉연 강판 및 그 제조방법 | |
WO2024128763A1 (ko) | 도금강판 및 그 제조방법 | |
KR102493772B1 (ko) | 인산염 처리성이 우수한 냉연강판 및 이의 제조방법 | |
WO2023113558A1 (ko) | 프레스 성형성이 우수한 냉연강판, 아연도금강판, 및 이들의 제조 방법 | |
WO2022131671A1 (ko) | 도금성이 우수한 고강도 용융아연도금강판 및 그 제조방법 | |
WO2024136238A1 (ko) | 내덴트성이 우수한 강판 및 그 제조방법 | |
WO2024025245A1 (ko) | 무방향성 전기강판 및 그 제조 방법 | |
WO2022139390A1 (ko) | 표면품질과 전기 저항 점용접성이 우수한 아연도금강판 및 그 제조방법 | |
WO2022131635A1 (ko) | 강도, 성형성 및 표면 품질이 우수한 도금강판 및 이의 제조방법 | |
WO2022131848A1 (ko) | 열간 프레스 성형용 도금강판 및 그 제조 방법 | |
WO2024063574A1 (ko) | 무방향성 전기강판 및 그 제조 방법 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 21911422 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 18268571 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2023538162 Country of ref document: JP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 202180093866.X Country of ref document: CN |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 21911422 Country of ref document: EP Kind code of ref document: A1 |