WO2005045084A1 - 化成処理性に優れた熱延鋼板およびその製造方法 - Google Patents
化成処理性に優れた熱延鋼板およびその製造方法 Download PDFInfo
- Publication number
- WO2005045084A1 WO2005045084A1 PCT/JP2004/016692 JP2004016692W WO2005045084A1 WO 2005045084 A1 WO2005045084 A1 WO 2005045084A1 JP 2004016692 W JP2004016692 W JP 2004016692W WO 2005045084 A1 WO2005045084 A1 WO 2005045084A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- steel sheet
- less
- concentration
- hot
- rolled steel
- Prior art date
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 115
- 239000010959 steel Substances 0.000 title claims abstract description 115
- 239000000126 substance Substances 0.000 title claims abstract description 55
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 238000005554 pickling Methods 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000005098 hot rolling Methods 0.000 claims abstract description 13
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims description 47
- 239000000243 solution Substances 0.000 claims description 16
- 150000002500 ions Chemical class 0.000 claims description 13
- 238000007654 immersion Methods 0.000 claims description 11
- 239000012535 impurity Substances 0.000 claims description 9
- 239000007864 aqueous solution Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 4
- 229910021645 metal ion Inorganic materials 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 150000002739 metals Chemical group 0.000 claims 1
- 239000007787 solid Substances 0.000 claims 1
- 239000011248 coating agent Substances 0.000 abstract description 13
- 238000000576 coating method Methods 0.000 abstract description 13
- 230000015572 biosynthetic process Effects 0.000 abstract description 5
- 238000003908 quality control method Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 20
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 18
- 229910052748 manganese Inorganic materials 0.000 description 10
- 230000007423 decrease Effects 0.000 description 9
- 235000013339 cereals Nutrition 0.000 description 7
- 239000010949 copper Substances 0.000 description 7
- 238000007739 conversion coating Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 239000013078 crystal Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000005755 formation reaction Methods 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 238000004453 electron probe microanalysis Methods 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000010828 elution Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000010422 painting Methods 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 239000012847 fine chemical Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 206010013786 Dry skin Diseases 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 231100000241 scar Toxicity 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- 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
- 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
- C23G1/085—Iron or steel solutions containing HNO3
-
- 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
- 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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- 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
- C23C22/78—Pretreatment of the material to be coated
-
- 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
Definitions
- the present invention relates to a hot-rolled steel sheet excellent in chemical conversion treatment and capable of uniformly forming a chemical conversion coating on the entire surface of a steel sheet when a chemical conversion treatment is performed as a coating base treatment of the steel sheet, and a method of manufacturing the same. It is. Rice field
- chemical conversion treatment is performed as a base treatment.
- the metal surface is covered with an inert chemical conversion coating to improve the adhesion and corrosion resistance of the coating applied thereon.
- high-strength steel sheets are used from the viewpoint of reducing the weight and safety of automobiles, and hot-rolled steel sheets, which are cheaper than cold-rolled steel sheets, are used for undercarriage members.
- Hot-rolled steel sheets are manufactured through a hot rolling and pickling process.
- oxide scale on the steel plate surface is removed by hydrochloric acid pickling.
- Japanese Patent Application Laid-Open No. 11-50187 discloses that the problem of deterioration of chemical conversion treatment and the deterioration of corrosion resistance after coating by reducing the Si concentration ratio between the surface and the inside of a steel sheet to 1.3 or less is described.
- a resolved high strength hot rolled steel sheet is disclosed.
- As a means for setting the Si concentration ratio as described above it has been shown that the Si oxide present on the surface is reduced by, for example, grinding a hot-rolled copper plate after pickling.
- Japanese Patent Application Laid-Open No. 10-1748 discloses that the surface layer of A high-strength hot-rolled steel sheet having improved chemical conversion property and workability by setting the hardness ratio to 0.95 or less is disclosed.
- the target is Ti-added steel, and the hardness ratio is changed as described above by replacing the precipitates on the steel sheet surface with carbide instead of Ti oxide Ti 0 2 which degrades the chemical conversion property. ing. Ti0 2 whereas increasing the hardness of the copper plate becomes integer if fine precipitates, Ti C is because lowering the hardness of the steel sheet in a non-aligned, hot rolling conditions on the means shown Have been.
- ⁇ scale '' where no chemical conversion coating is formed may be observed by microscopic observation .
- rusting is observed by the naked eye, and even if rust is not observed, a problem such as peeling of the coating film occurs with the lapse of time after painting.
- JP-A-11-50187 limits the Si concentration ratio between the surface and the inside of the steel sheet
- JP-A-10-1748 limits the hardness ratio between the surface and the inside to a specific range. This is intended to improve the chemical conversion property.
- the measured value at the position ground by 0.5 mm from the surface is defined as the internal Si concentration
- the measured value at the depth of 1 Z4 from the surface is defined as the internal hardness.
- the technique of Patent Document 1 requires a step of grinding the surface of a steel sheet.
- Patent Document 2 is a special technique for Ti-added steel having a Si content of 0.8% by mass or less and controlling the state of precipitates by hot rolling conditions. Therefore, the problem to be solved by the present invention is to make it possible to uniformly form a conversion coating on the entire surface of a steel sheet by applying a coating undercoat on a high-strength hot-rolled steel sheet with an increased Si content. It is also to facilitate quality control without adding any additional information.
- the inventor of the present invention has conducted intensive studies on the improvement of the chemical conversion treatment, and as a result, focused on the oxide concentration on the steel sheet surface and the properties of the steel sheet surface, particularly the irregularities and roughness, and specified the Si and Mn concentrations of the oxide on the steel sheet surface.
- the present invention embodies this finding, is a steel sheet manufactured through a hot rolling and pickling process, and has a component composition in mass%.
- Mn 0.5 to 3.0%
- P 0.07% or less
- Mn 0.5 to 3.0%
- P 0.07% or less
- the balance being Fe and unavoidable impurities
- the oxide on the surface of the steel sheet is not more than 3.5% by mass, with Si concentration of 3.5% or less and Mn concentration of 3.5% or less.
- the average roughness Ra of the steel sheet surface is 3.0 ⁇ m or less, and the number of bits having a diameter of 1 im or less and 0.3 / zm or more by pickling is 10 ⁇ per side. It is preferable that the average number is 5 or less in each cell when the steel sheet surface is divided by.
- the method of the present invention for solving the above-mentioned problems is characterized in that, in the pickling step for producing the hot-rolled steel sheet of the present invention, the HC1 concentration is 7 to 15% by mass%, and the Fe ion concentration is 4 to Manufacture of hot-rolled steel sheets with excellent chemical conversion properties characterized by being immersed in an aqueous solution consisting of 12% of metal ions other than Fe and impurities at a solution temperature of 80 to 98 ° C for 40 seconds or more Is the way. Further, in the pickling step in producing the hot-rolled steel sheet of the preferred embodiment of the present invention, the mass is used. /.
- the concentration of HC1 is 7 ⁇ : 15%, the concentration of Fe ion is 4 ⁇ 12%, and the balance is aqueous solution consisting of metal ions and impurities other than Fe.
- Concentration (% by mass) X Immersion time (seconds) Force This is a method for producing a hot-rolled steel sheet excellent in chemical treatment, characterized by immersion for a time within a range of S 520 or less.
- the mass is contained in the aqueous solution. /. In arbitrary preferable that is 0.5 to 5% HN0 3.
- the component composition of the steel sheet has high strength and high workability that can be used for lower parts of automobiles and the like, and also has excellent chemical conversion treatment properties. Therefore, it was limited to the above range.
- the reasons for the limitation are as follows. All percentages of each element are mass%.
- Si is less than 0.8%, the strength and elongation will be low, and if it exceeds 3.0%, the pickling properties will be reduced.
- Mn is less than 0.5%, elongation will be low, and if it exceeds 3.0%, pickling properties will be reduced.
- A1 is less than 0.015%, oxides of Si and Mn are formed on the surface of the steel sheet to decrease the chemical conversion property, and if it exceeds 0.1%, the corrosion resistance decreases.
- N is less than 0.001%, the chemical conversion property decreases, and if N exceeds 0.008%, the elongation decreases.
- the steel sheet of the present invention may contain, in addition to the above components, the following components alone or in combination as necessary.
- one or both of Ti and Nb can be added. In this case, if Ti is less than 0.02%, the effect of improving the strength by the formation of carbonitride is small, and the effect of increasing the mechanical strength by adding Ti cannot be secured. Even if added over 0.3%, the effect of increasing the strength is saturated.
- Nb is less than 0.01%, the effect of improving strength is small, and the effect of improving mechanical strength by adding Nb cannot be ensured. Even if it exceeds 0.5%, the effect of increasing strength is saturated.
- heat treatment can be performed by adding Cu and heating to a temperature of about 450 to 650 ° C as necessary. In that case, If Cu is less than 0.2%, the effect is small, and even if added over 1.8%, the effect is saturated.
- Ni is also added to prevent cracking of the steel sheet during hot working. The effect of Ni is exerted at 0.1% or more and saturates at 2.0%.
- Mo can be added. In this case, if Mo is less than 0.05%, the effect of increasing the strength by forming carbides is small, and the effect of increasing the mechanical strength by adding Mo cannot be ensured. The effect of increasing strength saturates even if added over 0.5%.
- B can be added to reduce the aging caused by nitrogen and improve the hole expanding property. The effect is exerted when B is added at 0.0002% or more, and saturates at 0.006%.
- Ca can be added to prevent a decrease in hole expanding property due to MnS formation. The effect is exhibited when Ca is added in an amount of 0.0005% or more, and is saturated at 0.005%.
- the oxide on the steel sheet surface having such a composition has a Si concentration of 3.5% or less and a Mn concentration of 3.5% or less in mass%.
- the hot-rolled steel sheet manufactured through the hot rolling and pickling processes has its surface oxidized scale removed by pickling.However, in the case of steel sheets with high Si content, even if the oxidized scale is completely removed from the appearance, Oxide partially remains.
- the present invention has solved the problem of chemical conversion treatment by bringing this oxide into the above state.
- the chemical conversion treatment is performed by removing the oil adhering to the steel sheet surface by degreasing and then immersing it in a chemical conversion treatment solution for a predetermined time.
- Fe ions are eluted from the steel sheet into the treatment solution and react with the components of the solution, generating a large number of nuclei of chemically formed crystal grains composed of compounds containing Fe, Zn, P, O, etc. It grows to form a coating covering the entire surface of the steel sheet. At this time, it is necessary to attach fine chemical grains of 10 / xm or less uniformly over the entire surface.
- scaling problems such as poor adhesion of the coating film at the time of painting and deterioration of corrosion resistance after painting occur.
- Non-adhesion sites called "scales” tend to occur. From this phenomenon, it is considered that Fe ion elution is delayed in the chemical conversion treatment in the remaining portion of the oxide having a high Si content, and the formation reaction of the chemical conversion crystal grains is delayed, resulting in the above-mentioned invisibility. In addition, even if an oxide having a high Mn content remains, the likelihood of occurrence of scalability is also increased.
- the Si concentration of the oxide is 3.5% by mass or less and the Mn concentration is 3.5% by mass or less even if an oxide remains on the surface of the steel sheet after pickling. Therefore, there is no delay in Fe ion elution during the chemical conversion treatment. Therefore, the nuclei grow to the same extent as the oxide-free part, forming fine converted crystal grains of 10 ⁇ m or less, covering the entire surface of the oxide and consisting of fine fine converted crystal grains uniformly over the entire steel plate.
- the conversion coating is formed by adhesion, and it is possible to avoid occurrence of scalability.
- the surface state of the steel sheet of the present invention can be determined by determining oxides from the oxygen distribution on the steel sheet surface by EPMA and analyzing the Si concentration and the Mn concentration.
- the analysis of Si and Mn on the steel surface by EPMA is usually performed with an accelerating voltage of 15 kV. In this case, the concentration from the outermost surface of the steel sheet to a depth of about 3 / x m is detected.
- the analysis values of Si and Mn by EPMA at an accelerating voltage of 15 kV may be 3.5 mass% or less, respectively. It does not have to be the concentration of only the oxide. It has been confirmed that if the steel sheet surface is in such a state, the chemical conversion property is good.
- rust may be formed after the chemical conversion treatment even if a coating composed of fine chemical conversion crystal grains is uniformly formed on the entire steel sheet by the chemical conversion treatment.
- the present inventors investigated in detail the steel sheet in which such rust was generated and the steel sheet in which such rust was not generated. As a result, the surface roughness of the steel sheet and micro holes were related to rust generation, and the micro holes were bitting generated by pickling.
- the average roughness Ra of the steel sheet surface is 3.0 ⁇ or less, and the number of bits by pickling is averaged in each cell when the steel sheet surface is divided by a cell of 10 m on each side. It was found that if the number was less than 5, rust did not occur after the chemical conversion treatment. It is more preferable that the average is three or less.
- the biting is a hole with a diameter of 1 ⁇ m or less and 0.3 ⁇ m or more. Rust formation is observed by visual observation immediately after washing and drying after the chemical conversion treatment, and no rust formation is observed in steel sheets that have not formed rust immediately after drying.
- the biting and the average roughness Ra of the steel plate surface were measured by cutting a sample with a total width of about 500 mm and a length of about 500 mm from a steel plate. Is measured by dividing the range of 100 / zm X 10 ⁇ by the square of ⁇ ⁇ on one side. Regarding the average roughness Ra of the steel sheet surface, the average roughness Ra at the same position is measured. The average roughness Ra was measured based on the arithmetic average roughness method of JIS B0601. As a measuring instrument for the average roughness Ra, a stylus-type roughness meter is preferable, and Mitutoyo Corporation Measured with "SURFTEST SV-400".
- the method of the present invention is a pickling method for producing the steel sheet of the present invention.
- the pickling conditions for reducing the oxides on the steel sheet surface to 3.5% or less by mass of Si and 3.5% or less by mass% are as follows: HC1 concentration: 7 to 15% by mass% and Fe ion concentration by 4% by mass%. This is a condition where the solution is immersed in an aqueous solution consisting of metal ions other than Fe and impurities at a solution temperature of 80 to 98 ° C for 40 seconds or more. Pickling under these conditions can be performed without any problem in the ordinary hot-rolled sheet pickling process, and the scale on the surface of the steel sheet is appropriately removed to obtain a hot-rolled steel sheet having excellent chemical conversion treatment properties.
- the HC1 concentration is less than 7%, the Fe ion concentration is less than 4%, the solution temperature is less than 80 ° C, and the immersion time is less than 40 seconds, oxides with Si and Mn concentrations exceeding 3.5% remain on the steel sheet surface. I do. If the HC1 concentration is more than 15%, the Fe ion concentration is more than 12%, and the solution temperature is more than 98 ° C, the surface of the steel sheet is roughened by pickling, and the chemical conversion property is reduced. Preferably, pickling at a solution temperature of 85 to 95 ° C is effective.
- the average roughness Ra of the steel sheet surface is 3.0 ⁇ m or less
- the number of bits by pickling is 5 ⁇ m on average in each cell when the steel sheet surface is divided into 10 ⁇ m cells on each side.
- the pickling conditions to be less than or equal to the number of pieces are further limited to the above-mentioned conditions of the present invention, and the HC1 concentration (% by mass) X immersion time (second) at a liquid temperature of 80 to 95 ° C for 40 seconds or more This is a condition for immersion for a time within a range of a force of not more than 20.
- the slab heating temperature in the hot rolling was 1200 ° C
- the hot rolling finishing temperature was 880 ° C
- the pickling was performed by immersing the cut plate in an experimental pickling tank.
- ct in Table 2 is the value of HC1 concentration (% by mass) X immersion time (second).
- Table 3 shows the results.
- concentrations of Si and Mn were analyzed by EPMA at an accelerating voltage of 15 kV.
- the chemical conversion treatment was performed in the same manner as the actual chemical conversion treatment, using an experimental tank for the cut plate. That is, after degreasing, the substrate was immersed in a surface conditioning solution for 30 seconds, then immersed in a chemical conversion solution (PBWL35, manufactured by Nippon Periki Rising Co., Ltd.), treated for 120 seconds, washed with water, and dried. Judgment of the chemical conversion treatment was made based on the presence or absence of scum by SEM observation of the surface of the steel sheet coated with the chemical conversion coating, and the presence or absence of rust by visual observation immediately after drying. The mechanical properties of the steel sheet were also shown.
- No. 1 to No. 6 and No. ll to No. 26 of the present invention all have no scar and no rust after the chemical conversion treatment. Processability was obtained.
- Nos. 18 to 26 are those to which special elements have been added.
- No. 18 to No. 23 show an improvement in tensile strength.
- No. 18 is the effect of adding Ti
- No. 19 and No. 20 are the effects of adding Ti and Nb
- No. 21 and No. 22 are the effects of adding Cu and Ni
- No. 23 is the effect of adding Mo.
- the hole expansion rate was improved by the addition of Ca
- No. 26 the hole expansion rate was improved by the addition of B.
- the pickling conditions of the present invention example were all HC1 concentration X immersion time (ct) force ⁇ 520 or less, and a coating consisting of fine converted crystal grains was formed. No rust was observed at the site where the rust occurred.
- the present invention is intended to improve the chemical conversion processability, Since there is no need to reduce the content, high-strength, high-workability hot-rolled steel sheets used for reducing the weight and ensuring safety of automobiles can achieve strength and workability without the use of other additional elements. There is no loss. In addition, it can be manufactured only by adjusting the pickling conditions after the usual hot rolling step and pickling step. Furthermore, since the Si concentration and the Mn concentration on the steel sheet surface need only be within appropriate ranges, quality control is easy.
- Ra was measured based on the arithmetic mean roughness method of JIS B0601.
- the measuring device is measured by "SURFTEST SV-400" of Mitutoyo Corporation.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/578,145 US7820099B2 (en) | 2003-11-05 | 2004-11-04 | Hot rolled steel sheet excellent in chemical convertibility and method of production of the same |
CN2004800323515A CN1875123B (zh) | 2003-11-05 | 2004-11-04 | 化学转化成膜性能优良的热轧钢板及其制造方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-375182 | 2003-11-05 | ||
JP2003375182A JP4206029B2 (ja) | 2003-11-05 | 2003-11-05 | 化成処理性に優れた熱延鋼板およびその製造方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005045084A1 true WO2005045084A1 (ja) | 2005-05-19 |
Family
ID=34567062
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/016692 WO2005045084A1 (ja) | 2003-11-05 | 2004-11-04 | 化成処理性に優れた熱延鋼板およびその製造方法 |
Country Status (6)
Country | Link |
---|---|
US (1) | US7820099B2 (ja) |
JP (1) | JP4206029B2 (ja) |
KR (1) | KR100819218B1 (ja) |
CN (1) | CN1875123B (ja) |
TW (1) | TWI251028B (ja) |
WO (1) | WO2005045084A1 (ja) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1865085B1 (en) * | 2005-03-31 | 2016-03-09 | Kabushiki Kaisha Kobe Seiko Sho | High-strength cold-rolled steel sheet excellent in coating adhesion, workability and hydrogen embrittlement resistance, and steel component for automobile |
JP2007162057A (ja) * | 2005-12-13 | 2007-06-28 | Jfe Steel Kk | リン酸塩処理性に優れた高強度鋼板 |
EP2302102B1 (en) * | 2008-05-30 | 2017-11-15 | Nippon Steel & Sumitomo Metal Corporation | Pickling method for steel plates |
CN101659175B (zh) * | 2009-09-02 | 2012-11-21 | 苏州扬子江新型材料股份有限公司 | 一种抗刮耐磨彩色涂层钢板 |
JP4837802B2 (ja) | 2009-11-18 | 2011-12-14 | 新日本製鐵株式会社 | 酸洗性、化成処理性、疲労特性、穴広げ性、および成形時の耐肌荒れ性に優れ、かつ強度と延性が等方性である高強度熱延鋼板およびその製造方法 |
JP5835558B2 (ja) * | 2010-08-31 | 2015-12-24 | Jfeスチール株式会社 | 冷延鋼板の製造方法 |
US20150013716A1 (en) * | 2012-01-18 | 2015-01-15 | Jfe Steel Corporation | Method for prevention of yellowing on surface of steel sheet after pickling |
JP6160655B2 (ja) * | 2014-07-14 | 2017-07-12 | Jfeスチール株式会社 | 熱延鋼板及びその製造方法 |
JP6123754B2 (ja) * | 2014-08-14 | 2017-05-10 | Jfeスチール株式会社 | 化成処理性に優れるSi含有熱延鋼板およびその製造方法 |
CN115466947B (zh) * | 2022-08-31 | 2024-01-16 | 马鞍山钢铁股份有限公司 | 一种免涂装耐候钢表面稳定化处理剂及免涂装耐候钢的表面处理方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02138490A (ja) * | 1988-11-17 | 1990-05-28 | Kobe Steel Ltd | 接着性高炭素熱延鋼板の製造方法 |
JPH1150187A (ja) * | 1997-06-04 | 1999-02-23 | Kawasaki Steel Corp | 塗装後の耐食性及び耐衝撃特性に優れる高強度高加工性鋼板 |
JP2003155541A (ja) * | 2001-11-16 | 2003-05-30 | Nippon Steel Corp | 耐食性と伸びフランジ性に優れた高強度熱延鋼板、およびその製造方法 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01150187A (ja) * | 1987-12-08 | 1989-06-13 | Matsushita Electric Ind Co Ltd | クリーニング装置 |
JP3358938B2 (ja) | 1996-06-10 | 2002-12-24 | 株式会社神戸製鋼所 | 化成処理性と加工性にすぐれる高強度熱延鋼板 |
CA2372388C (en) * | 2000-04-07 | 2009-05-26 | Kawasaki Steel Corporation | Hot-rolled steel sheet, cold-rolled steel sheet and hot-dip galvanized steel sheet excellent in strain age hardening property, and manufacturing method thereof |
-
2003
- 2003-11-05 JP JP2003375182A patent/JP4206029B2/ja not_active Expired - Lifetime
-
2004
- 2004-11-04 US US10/578,145 patent/US7820099B2/en not_active Expired - Fee Related
- 2004-11-04 KR KR1020067008689A patent/KR100819218B1/ko active IP Right Grant
- 2004-11-04 CN CN2004800323515A patent/CN1875123B/zh active Active
- 2004-11-04 WO PCT/JP2004/016692 patent/WO2005045084A1/ja active Application Filing
- 2004-11-05 TW TW093133806A patent/TWI251028B/zh not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02138490A (ja) * | 1988-11-17 | 1990-05-28 | Kobe Steel Ltd | 接着性高炭素熱延鋼板の製造方法 |
JPH1150187A (ja) * | 1997-06-04 | 1999-02-23 | Kawasaki Steel Corp | 塗装後の耐食性及び耐衝撃特性に優れる高強度高加工性鋼板 |
JP2003155541A (ja) * | 2001-11-16 | 2003-05-30 | Nippon Steel Corp | 耐食性と伸びフランジ性に優れた高強度熱延鋼板、およびその製造方法 |
Also Published As
Publication number | Publication date |
---|---|
KR20060085939A (ko) | 2006-07-28 |
KR100819218B1 (ko) | 2008-04-02 |
JP2005139486A (ja) | 2005-06-02 |
CN1875123B (zh) | 2011-09-07 |
US20070138138A1 (en) | 2007-06-21 |
TWI251028B (en) | 2006-03-11 |
CN1875123A (zh) | 2006-12-06 |
US7820099B2 (en) | 2010-10-26 |
TW200521245A (en) | 2005-07-01 |
JP4206029B2 (ja) | 2009-01-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4589880B2 (ja) | 成形性と穴拡げ性に優れた高強度溶融亜鉛めっき鋼板と高強度合金化溶融亜鉛めっき鋼板及び高強度溶融亜鉛めっき鋼板の製造方法並びに高強度合金化溶融亜鉛めっき鋼板の製造方法 | |
JP4464720B2 (ja) | 高強度溶融亜鉛めっき鋼板およびその製造方法 | |
WO2003074751A1 (fr) | Plaque d'acier a surface traitee et procede de production correspondant | |
JP5962541B2 (ja) | 高強度鋼板の製造方法 | |
TWI519656B (zh) | 疲勞特性優異之高強度融熔鍍鋅鋼板及其製造方法 | |
US10174430B2 (en) | Si-containing high strength cold rolled steel sheet, method of producing the same, and automotive members | |
WO2015125422A1 (ja) | 高強度鋼板および高強度鋼板の製造方法 | |
WO2005045084A1 (ja) | 化成処理性に優れた熱延鋼板およびその製造方法 | |
JP4238153B2 (ja) | 均一外観性に優れた高強度電気亜鉛めっき鋼板およびその製造方法 | |
JP5962540B2 (ja) | 高強度鋼板の製造方法 | |
WO2015125465A1 (ja) | 高強度鋼板およびその製造方法 | |
WO2013042356A1 (ja) | 塗装後耐食性に優れる合金化溶融亜鉛めっき鋼板 | |
JP4926517B2 (ja) | 塗装後耐食性に優れた高強度冷延鋼板の製造方法 | |
JP6020485B2 (ja) | 高強度鋼板およびその製造方法 | |
JP5794284B2 (ja) | 高強度鋼板の製造方法 | |
JP6699633B2 (ja) | 塗装後耐食性と耐遅れ破壊特性に優れた高強度冷延鋼板及びその製造方法 | |
JP2005146318A (ja) | 化成処理性に優れた熱延鋼板およびその製造方法 | |
JP5907106B2 (ja) | 亜鉛めっき冷延鋼板 | |
JP4428033B2 (ja) | プレス成形性に優れた溶融亜鉛めっき又は合金化溶融亜鉛めっき鋼板 | |
JP5962542B2 (ja) | 高強度鋼板の製造方法 | |
JP6114957B2 (ja) | 高強度鋼板およびその製造方法 | |
CN111886353B (zh) | 合金化热浸镀锌钢板以及合金化热浸镀锌钢板的制造方法 | |
JP5962543B2 (ja) | 高強度鋼板の製造方法 | |
JP2009280859A (ja) | 加工性、めっき密着性、耐食性、および外観品位に優れた合金化溶融亜鉛めっき鋼板 | |
JP2005200739A (ja) | 化成処理性に優れた熱延鋼板およびその製造方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 200480032351.5 Country of ref document: CN |
|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2007138138 Country of ref document: US Ref document number: 10578145 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: PA/a/2006/004994 Country of ref document: MX Ref document number: 1020067008689 Country of ref document: KR |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2767/DELNP/2006 Country of ref document: IN |
|
WWP | Wipo information: published in national office |
Ref document number: 1020067008689 Country of ref document: KR |
|
122 | Ep: pct application non-entry in european phase | ||
WWP | Wipo information: published in national office |
Ref document number: 10578145 Country of ref document: US |