WO2016002141A1 - 高強度溶融亜鉛めっき鋼板の製造方法 - Google Patents
高強度溶融亜鉛めっき鋼板の製造方法 Download PDFInfo
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- WO2016002141A1 WO2016002141A1 PCT/JP2015/002976 JP2015002976W WO2016002141A1 WO 2016002141 A1 WO2016002141 A1 WO 2016002141A1 JP 2015002976 W JP2015002976 W JP 2015002976W WO 2016002141 A1 WO2016002141 A1 WO 2016002141A1
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- Prior art keywords
- less
- steel sheet
- pickling
- hot
- atmosphere
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 229910001335 Galvanized steel Inorganic materials 0.000 title claims abstract description 32
- 239000008397 galvanized steel Substances 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 127
- 239000010959 steel Substances 0.000 claims abstract description 127
- 238000010438 heat treatment Methods 0.000 claims abstract description 54
- 238000007747 plating Methods 0.000 claims abstract description 46
- 238000005554 pickling Methods 0.000 claims abstract description 36
- 238000005096 rolling process Methods 0.000 claims abstract description 27
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 230000009467 reduction Effects 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims description 22
- 238000005275 alloying Methods 0.000 claims description 15
- 239000012535 impurity Substances 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 229910052720 vanadium Inorganic materials 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- 229910052718 tin Inorganic materials 0.000 claims description 5
- 229910052787 antimony Inorganic materials 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 229910052758 niobium Inorganic materials 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims 1
- 230000008018 melting Effects 0.000 claims 1
- 230000004580 weight loss Effects 0.000 abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 23
- 239000011701 zinc Substances 0.000 description 17
- 238000000137 annealing Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 11
- 229910001566 austenite Inorganic materials 0.000 description 10
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 9
- 230000003647 oxidation Effects 0.000 description 9
- 238000007254 oxidation reaction Methods 0.000 description 9
- 229910052725 zinc Inorganic materials 0.000 description 9
- 238000005728 strengthening Methods 0.000 description 8
- 238000005246 galvanizing Methods 0.000 description 7
- 230000007547 defect Effects 0.000 description 5
- 238000005098 hot rolling Methods 0.000 description 5
- 229920006395 saturated elastomer Polymers 0.000 description 5
- 229920000298 Cellophane Polymers 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 239000002344 surface layer Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 239000012467 final product Substances 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000009863 impact test Methods 0.000 description 2
- 238000005121 nitriding Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- -1 by mass% Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 238000004876 x-ray fluorescence Methods 0.000 description 1
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- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
- C23C2/29—Cooling or quenching
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- 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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
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- 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
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
Definitions
- the present invention relates to a method for producing a high-strength hot-dip galvanized steel sheet that is suitable for application to automotive parts.
- the hot dip galvanizing treatment is performed after the steel sheet is annealed at a temperature of about 600 to 900 ° C. in a non-oxidizing atmosphere or a reducing atmosphere.
- the easily oxidizable element in steel is selectively oxidized in a generally used non-oxidizing atmosphere or reducing atmosphere, and is concentrated on the surface to form an oxide on the surface of the steel sheet. This oxide lowers the wettability between the surface of the steel sheet and the molten zinc during the hot dip galvanizing process and causes non-plating.
- the concentration of easily oxidizable elements in steel increases, the wettability decreases rapidly and non-plating occurs frequently.
- Patent Document 1 the steel sheet is heated in an oxidizing atmosphere in advance, and an Fe oxide film is rapidly formed on the surface at an oxidation rate higher than a predetermined value to prevent oxidation of the additive element on the steel sheet surface. Then, a method of improving wettability with molten zinc on the surface of the steel sheet by reducing annealing the Fe oxide film has been proposed.
- the amount of oxidation of the steel sheet is large, there arises a problem that iron oxide adheres to the in-furnace roll and the steel sheet is pressed. Further, since Mn is dissolved in the Fe oxide film, Mn oxide tends to be easily formed on the surface of the steel sheet during reduction annealing, and the effect of the oxidation treatment is small.
- Patent Document 2 proposes a method of removing surface oxides by performing pickling after annealing a steel sheet, and then annealing again to perform hot dip galvanization.
- the amount of alloying element added is large, oxides are formed again on the surface at the time of re-annealing, so that there is a problem that plating adhesion deteriorates even when non-plating does not occur.
- Japanese Patent No. 2587724 Japanese Patent Laid-Open No. 4-202630
- Japanese Patent No. 395550 Japanese Patent Laid-Open No. 2000-290730
- an object of the present invention is to provide a method for producing a high-strength hot-dip galvanized steel sheet excellent in plating adhesion and surface appearance.
- the present inventors have conducted intensive studies to produce a steel sheet containing Mn, having excellent surface appearance and excellent plating adhesion, and found the following.
- the present invention is based on the above findings, and features are as follows.
- component composition C: 0.040% to 0.500%, Si: 0.80% or less, Mn: 1.80% to 4.00%, P: 0.100 by mass% % Or less, S: 0.0100% or less, Al: 0.100% or less, N: 0.0100% or less, and the H 2 concentration is set to 0.
- a cooling step for cooling the steel plate a rolling step for rolling the steel plate after the cooling step under a condition of a rolling reduction of 0.3% to 2.0%, and a steel plate after the rolling step for pickling reduction. and There 0.02 g / m 2 or more 5 g / m 2 or less in terms of Fe
- H 2 concentration is less 0.05 vol% or more 25.0Vol%, in dew point of -10 ° C. or less atmosphere, 720 ° C. or higher 860 ° C.
- strength hot-dip galvanized steel sheet which has a 2nd heating process hold
- Ti 0.010% to 0.100%
- Nb 0.010% to 0.100%
- B 0.0001
- the component composition is, in mass%, Mo: 0.01% to 0.50%, Cr: 0.30% or less, Ni: 0.50% Cu: 1.00% or less, V: 0.500% or less, Sb: 0.10% or less, Sn: 0.10% or less, Ca: 0.0100% or less, REM: 0.010% or less
- the high-strength hot-dip galvanized steel sheet is a steel sheet having a tensile strength (TS) of 780 MPa or more
- the hot-dip galvanized steel sheet is a plated steel sheet that is not subjected to an alloying treatment after the hot-dip galvanizing treatment (hereinafter referred to as a steel plate).
- GI tensile strength
- GA plated steel sheet
- a high-strength hot-dip galvanized steel sheet having excellent surface appearance and excellent plating adhesion can be obtained.
- fuel efficiency can be improved by reducing the weight of the vehicle body.
- % representing the component amount means “mass%”.
- C 0.040% or more and 0.500% or less
- Si 0.80% or less
- Mn 1.80% or more and 4.00% or less
- P 0.100% or less
- S 0.100% or less
- Al 0.100% or less
- N 0.0100% or less
- Ti 0.010% or more and 0.100% or less
- Nb 0.010% or more and 0.100% or less
- B 0.0001% or more and 0.0050% or less
- Mo 0.01% or more and 0.50% or less
- Cr 0.30% or less
- Ni 0.50% or less
- Cu 1.00% or less
- V 0 .500% or less
- Sb 0.10% or less
- Sn 0.10% or less
- Ca 0.0100% or less
- REM 0.010% or less. Also good.
- each component will be described.
- C 0.040% or more and 0.500% or less
- C is an austenite generating element, which is an element effective for improving the strength and ductility by complexing the annealed plate structure.
- the C content is set to 0.040% or more.
- the C content exceeds 0.500%, the welded portion and the heat affected zone are hardened, the mechanical properties of the welded portion are deteriorated, and spot weldability, arc weldability, and the like are lowered. Therefore, the C content is 0.500% or less.
- Si 0.80% or less Si is a ferrite-forming element, and is also an element effective for improving the solid solution strengthening and work hardening ability of the ferrite of the annealed plate.
- Si content exceeds 0.80%, Si forms an oxide on the surface of the steel sheet during annealing and deteriorates the plating properties. Therefore, the Si content is 0.80% or less.
- Mn 1.80% or more and 4.00% or less
- Mn is an austenite generating element and is an element effective for securing the strength of the annealed plate.
- the Mn content is 1.80% or more.
- the Mn content exceeds 4.00%, the surface layer formed by forming a large amount of oxide on the steel sheet surface during annealing deteriorates the plating appearance. For this reason, the Mn content is 4.00% or less.
- P 0.100% or less
- P is an element effective for strengthening steel. From the viewpoint of strengthening steel, the P content is preferably 0.001% or more. However, if the content of P exceeds 0.100%, it causes embrittlement due to grain boundary segregation and deteriorates impact resistance. Therefore, the P content is 0.100% or less.
- S 0.0100% or less S becomes an inclusion such as MnS and causes deterioration in impact resistance and cracking along the metal flow of the weld. For this reason, the S content is preferably as low as possible. Therefore, the S content is set to 0.0100% or less.
- Al 0.100% or less
- the content of Al is set to 0.100% or less.
- N 0.0100% or less
- N is an element that degrades the aging resistance of steel. The smaller the content, the more preferable. N exceeds 0.0100%, and the deterioration of aging resistance becomes significant. Therefore, the N content is 0.0100% or less.
- the balance is Fe and inevitable impurities.
- strength hot-dip galvanized steel plate of this invention can contain the following elements for the purpose of high intensity
- Ti 0.010% or more and 0.100% or less
- Ti is an element that contributes to improving the strength of the steel sheet by forming fine carbide or fine nitride with C or N in the steel sheet.
- the Ti content is preferably 0.010% or more.
- this effect is saturated when the Ti content exceeds 0.100%. For this reason, the Ti content is preferably 0.100% or less.
- Nb 0.010% or more and 0.100% or less
- Nb is an element that contributes to strength improvement by solid solution strengthening or precipitation strengthening.
- the Nb content is preferably 0.010% or more.
- the Nb content is preferably 0.100% or less.
- B 0.0001% or more and 0.0050% or less B is an element that enhances hardenability and contributes to improving the strength of the steel sheet.
- the B content is preferably 0.0001% or more.
- the content of B is preferably 0.0050% or less.
- Mo 0.01% or more and 0.50% or less
- Mo is an austenite generating element and is an element effective for securing the strength of the annealed plate. From the viewpoint of securing strength, the Mo content is preferably 0.01% or more. However, since Mo has a high alloy cost, a large content causes an increase in cost. For this reason, the Mo content is preferably 0.50% or less.
- Cr 0.30% or less
- Cr is an austenite generating element and is an element effective for securing the strength of the annealed plate.
- the content of Cr exceeds 0.30%, an oxide may be formed on the surface of the steel sheet during annealing to deteriorate the plating appearance. Therefore, the Cr content is preferably 0.30% or less.
- Ni, Cu, and V are elements effective for strengthening steel, and steel is within the range defined in the present invention. It can be used for strengthening.
- the Ni content is preferably 0.05% or more
- the Cu content is preferably 0.05% or more
- the V content is preferably 0.005% or more.
- the contents are preferably 0.50% or less for Ni, 1.00% or less for Cu, and 0.500% or less for V.
- Sb 0.10% or less
- Sn 0.10% or less
- Sb and Sn have an action of suppressing nitriding in the vicinity of the steel sheet surface.
- the Sb content is preferably 0.005% or more
- the Sn content is preferably 0.005% or more.
- the above effect is saturated when the Sb content and the Sn content each exceed 0.10%. Therefore, when these elements are added, the Sb content is preferably 0.10% or less and the Sn content is preferably 0.10% or less.
- Ca 0.0100% or less
- Ca has an effect of improving ductility by shape control of sulfides such as MnS.
- the Ca content is preferably 0.0010% or more.
- the above effect is saturated when it exceeds 0.0100%. For this reason, when adding, content of Ca has preferable 0.0100% or less.
- REM 0.010% or less REM controls the form of sulfide inclusions and contributes to improvement of workability.
- the content of REM is preferably 0.001% or more.
- the content of REM is preferably 0.010% or less.
- the steel slab having the above component composition is subjected to rough rolling and finish rolling in the hot rolling step, and then the hot-rolled plate surface scale is removed and cold rolled in the pickling step.
- the conditions of the hot rolling process, the conditions of the pickling process, and the conditions of the cold rolling process are not particularly limited, and the conditions may be set as appropriate.
- the steel sheet surface is not exposed to the atmosphere after the pickling step and before the cold rolling step (for example, a tight coil state), and the H 2 concentration is 1.0 vol% or more and 25.0 vol% or less.
- a heat treatment process may be performed in which the temperature is maintained at 600 ° C.
- the heat treatment step means that the steel plate after the pickling step is 600 ° C. or more in an atmosphere having a H 2 concentration of 1.0 vol% or more and 25.0 vol% or less and a dew point of 10 ° C. or less in a state where the steel plate surface is not exposed to the atmosphere.
- This is a step of holding the temperature for 600 s or more and 21600 s or less.
- This heat treatment step is performed to concentrate Mn in the austenite phase in the steel sheet after hot rolling.
- the steel sheet structure after hot rolling is composed of a plurality of phases such as ferrite phase, austenite phase, pearlite phase, bainite phase, and cementite phase.
- the final product is obtained by concentrating Mn in the austenite phase. Improvement of ductility of hot dip galvanized steel sheet is expected. If the temperature of the heat treatment step is less than 600 ° C. or the holding time is less than 600 s, the concentration of Mn in the austenite phase may not proceed.
- the upper limit of the temperature is not particularly set, but if it exceeds 850 ° C., not only the concentration of Mn in the austenite phase is saturated but also the cost is increased. Therefore, the temperature is preferably 850 ° C. or lower.
- the heat treatment is preferably performed at a temperature of 600 ° C. or more and a holding time of 600 s or more and 21600 s or less.
- this heat treatment step the oxidation of the steel sheet surface is suppressed even during a long-time heat treatment in order to avoid an influence on the first heating step and the second heating step after the heat treatment step. Therefore, it is preferable not to expose the steel sheet surface to the atmosphere.
- “Do not expose the steel plate surface to the atmosphere” includes not only the state where both surfaces of the steel plate are not exposed to the atmosphere but also the state where one surface of the steel plate is not exposed to the atmosphere.
- the thickness surface of the steel sheet is an end surface and does not correspond to the surface.
- a method of completely shutting off the atmosphere such as vacuum furnace annealing, can be raised.
- this method has a large cost problem. Assuming the normal process, it is possible to prevent the atmosphere from entering between the steel plate and the steel plate by winding the steel plate coil tightly, so-called tight coil.
- the outermost peripheral surface of the coil is usually near the weld during heating in the subsequent process, and is cut out as a product.
- the H 2 concentration is preferably 1.0 vol% or more, which is a sufficient amount. If the H 2 concentration exceeds 25.0 vol%, the cost will increase. Therefore, the H 2 concentration is preferably 1.0 vol% or more and 25.0 vol% or less.
- the balance other than H 2 is N 2 , H 2 O and unavoidable impurities.
- the dew point exceeds 10 ° C., Fe on the coil end face may be oxidized, so the dew point is preferably 10 ° C. or less.
- a first heating step for holding in a temperature range of 750 ° C. to 880 ° C. for 20 seconds to 600 seconds in an atmosphere having an H 2 concentration of 0.05 vol% to 25.0 vol% and a dew point of ⁇ 45 ° C.
- the second heating step Hot dip galvanizing treatment A plating treatment process is performed.
- the unit “s” of the holding time in the first heating process and the second heating process means “second”.
- These first heating step, cooling step, rolling step, pickling step, second heating step and plating treatment step may be performed with continuous equipment or with separate equipment. Details will be described below.
- the first heating step is a process in which the steel sheet is heated for 20 s in a temperature range of 750 to 880 ° C in an atmosphere having an H 2 concentration of 0.05 to 25.0 vol% and a dew point of -45 to -10 ° C. This is a step of holding 600 s or less.
- Mn is oxidized on the surface of the steel sheet within a range where Fe is not oxidized.
- the H 2 concentration needs to be sufficient to suppress the oxidation of Fe, and is 0.05 vol% or more. On the other hand, if the H 2 concentration exceeds 25.0 vol%, the cost increases, so the H 2 concentration is set to 25.0 vol% or less.
- the balance is N 2 , H 2 O and inevitable impurities.
- the dew point when the dew point is less than ⁇ 45 ° C., oxidation of Mn is suppressed. When the dew point exceeds -10 ° C, Fe is oxidized. Therefore, the dew point is -45 ° C or higher and -10 ° C or lower.
- the heating temperature (steel plate temperature) of the steel plate to be held is set to a temperature range of 750 ° C. or higher and 880 ° C. or lower.
- the holding in the first heating step may be held in a state where the steel plate is kept at a constant temperature, or may be held while changing the temperature of the steel plate in a temperature range of 750 ° C. or higher and 880 ° C. or lower.
- the holding time is less than 20 s, sufficient Mn oxide is not formed on the surface, and when it exceeds 600 s, pickling efficiency is reduced due to excessive Mn oxide formation, and manufacturing efficiency is lowered. Accordingly, the holding time is 20 s or more and 600 s or less.
- Cooling process The said steel plate is cooled to the temperature which can be rolled.
- Rolling process The steel sheet after cooling is rolled under conditions where the rolling reduction is 0.3% or more and 2.0% or less.
- the steel sheet after the first heating process is lightly rolled, the oxide formed on the steel sheet surface is pushed into the steel sheet surface, and minute unevenness is imparted to the steel sheet surface, thereby improving the plating adhesion. Is what we do. If the rolling reduction is less than 0.3%, sufficient unevenness may not be imparted to the steel sheet surface. Moreover, when the rolling reduction exceeds 2.0%, a lot of distortion is introduced into the steel sheet, pickling is promoted in the next pickling process, and the unevenness formed in the rolling process may disappear. Therefore, the rolling reduction is set to 0.3% or more and 2.0% or less.
- the steel plate surface after the rolling step is pickled under the condition that the pickling loss is 0.02 g / m 2 or more and 5 g / m 2 or less in terms of Fe. This step is performed to clean the surface of the steel sheet and remove the acid-soluble oxide formed on the surface of the steel plate in the first heating step.
- the pickling weight loss is less than 0.02 g / m 2 in terms of Fe, the oxide may not be sufficiently removed.
- the pickling weight loss exceeds 5 g / m 2 , not only the oxide on the surface layer of the steel sheet but also the inside of the steel sheet having a reduced Mn concentration may be dissolved, and the formation of Mn oxide in the second heating step may not be suppressed. is there. Therefore, the pickling weight loss is 0.02 g / m 2 or more and 5 g / m 2 or less in terms of Fe.
- the Fe conversion value of the pickling loss was obtained from the change in Fe concentration in the pickling solution before and after passing and the area of the passing plate.
- the steel plate after pickling treatment is 20 s to 300 s in a temperature range of 720 ° C. to 860 ° C. in an atmosphere having an H 2 concentration of 0.05 vol% to 25.0 vol% and a dew point of ⁇ 10 ° C. Hold below.
- the second heating step is performed to activate the steel plate surface and to plate the steel plate.
- the H 2 concentration needs to be sufficient to suppress Fe oxidation, and is 0.05 vol% or more. Also, H 2 concentration is less 25.0Vol% for increasing the cost exceeds 25.0vol%. The balance is N 2 , H 2 O and inevitable impurities.
- the dew point should be -10 ° C or less.
- the steel plate temperature is less than 720 ° C.
- the steel plate surface is not activated and the wettability with molten zinc decreases.
- the steel plate temperature exceeds 860 ° C.
- Mn forms an oxide on the surface during annealing, thereby forming a surface layer containing Mn oxide and lowering the wettability between the steel plate and molten zinc. Therefore, the heating temperature (steel plate temperature) of the steel plate to be held is set to a temperature range of 720 ° C. or more and 860 ° C. or less.
- the holding in the second heating step may be held in a state where the steel plate is kept at a constant temperature, or may be held while changing the temperature of the steel plate.
- the holding time is less than 20 s, the steel plate surface is not activated sufficiently. If it exceeds 300 s, Mn forms an oxide on the surface again, so that a surface layer containing Mn oxide is formed, and wettability with molten zinc decreases. Accordingly, the holding time is 20 s or more and 300 s or less.
- the plating treatment step is a step in which the steel plate is cooled after the above treatment is performed, and the steel plate is immersed in a hot dip galvanizing bath to perform hot dip galvanization.
- a galvanizing bath having a bath temperature of 440 to 550 ° C. and an Al concentration in the bath of 0.14 to 0.24%.
- the bath temperature is less than 440 ° C.
- Zn may solidify in the low temperature part due to temperature fluctuation in the bath, which may be inappropriate.
- the temperature exceeds 550 ° C.
- the bath evaporates vigorously, and vaporized Zn adheres to the furnace, which may cause operational problems.
- alloying proceeds during plating, it tends to be overalloyed.
- a zinc plating bath having an Al concentration in the bath of 0.10 to 0.20%.
- Al concentration in the bath is less than 0.10%, a large amount of ⁇ phase is generated and powdering properties may be deteriorated. If it exceeds 0.20%, Fe-Zn alloying may not progress.
- alloying treatment step If necessary, the steel plate after the plating treatment step is further subjected to alloying treatment.
- the alloying treatment temperature is preferably more than 460 ° C. and less than 580 ° C. At 460 ° C. or lower, alloying progresses slowly, and at 580 ° C. or higher, a hard and brittle Zn—Fe alloy layer formed at the base iron interface due to overalloy is formed too much and the plating adhesion may deteriorate.
- hot dip galvanizing treatment was performed in a Zn bath containing 0.14 to 0.24% Al to obtain a hot dip galvanized steel sheet.
- Some of the steel plates were plated in a Zn bath containing 0.10 to 2.0% Al, and then alloyed under the conditions shown in Tables 2 to 6.
- the strength, total elongation, surface appearance, and plating adhesion were investigated by the following methods.
- the tensile test is performed in accordance with JIS Z 2241 using a JIS No. 5 test piece obtained by taking a sample so that the tensile direction is perpendicular to the rolling direction of the steel sheet, and TS (tensile strength) and EL (total elongation). was measured.
- the plating adhesion of the galvannealed steel sheet (GA) was evaluated by evaluating the powdering resistance. Specifically, cellophane tape is applied to the alloyed hot-dip galvanized steel sheet, the tape surface is bent 90 degrees, bent back, and the cellophane with a width of 24 mm is parallel to the bent portion on the inner side (compressed side) of the processed portion.
- the amount of zinc adhering to the 40 mm length portion of the cellophane tape was measured as the Zn count number by fluorescent X-ray, and the amount obtained by converting the Zn count number per unit length (1 m) was as follows: In light of the criteria, those with a rank of 2 or less were evaluated as particularly good ( ⁇ ), those with a rank of 3 were good ( ⁇ ), and those with a rank of 4 or more were evaluated as bad ( ⁇ ).
- X-ray fluorescence count Rank 0 or more and less than 2000: 1 (good) 2000 or more and less than 5000: 2 5000 or more and less than 8000: 3 8000 or more and less than 10,000: 4 10,000 or more: 5 (poor) About GI, the ball impact test was performed, the processed part was peeled off with cellophane tape, and the plating adhesion was evaluated by visually judging the presence or absence of peeling of the plating layer. The ball impact test was performed with a ball mass of 1.8 kg and a drop height of 100 cm. ⁇ : No peeling of plating layer ⁇ : Plating layer peeled For the above evaluation, the obtained results are shown in Tables 2 to 6 together with the conditions.
- the high-strength hot-dip galvanized steel sheets of the present invention examples have a TS of 780 MPa or more, and all have excellent surface appearance and adhesion. On the other hand, in the comparative example, one or more of the surface appearance and plating adhesion is inferior.
- the high-strength hot-dip galvanized steel sheet of the present invention example is improved in total elongation by performing a heat treatment step. For example, no. 1-10 and No. 1 When the total elongation of 105 to 111 is contrasted, the No. 5 in which the heat treatment process was performed is shown. From 105 to 111, the total elongation is improved. No. using U steel. Nos. 141 to 147 also have No. The total elongation is improved at 142 to 147.
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Abstract
Description
[1]成分組成として、質量%で、C:0.040%以上0.500%以下、Si:0.80%以下、Mn:1.80%以上4.00%以下、P:0.100%以下、S:0.0100%以下、Al:0.100%以下、N:0.0100%以下を含有し、残部がFeおよび不可避的不純物からなる鋼板に対して、H2濃度が0.05vol%以上25.0vol%以下、露点が-45℃以上-10℃以下の雰囲気中、750℃以上880℃以下の温度域で20s以上600s以下保持する第1加熱工程、前記第1加熱工程後の鋼板を冷却する冷却工程と、前記冷却工程後の鋼板を圧下率が0.3%以上2.0%以下の条件で圧延を施す圧延工程と、前記圧延工程後の鋼板を、酸洗減量がFe換算で0.02g/m2以上5g/m2以下となる条件で酸洗する酸洗工程と、前記酸洗工程後の鋼板を、H2濃度が0.05vol%以上25.0vol%以下、露点が-10℃以下の雰囲気中、720℃以上860℃以下の温度域で20s以上300s以下保持する第2加熱工程と、前記第2加熱工程後の鋼板に、溶融亜鉛めっき処理を施すめっき処理工程を有する高強度溶融亜鉛めっき鋼板の製造方法。
[2]上記[1]において、さらに、成分組成として、質量%で、Ti:0.010%以上0.100%以下、Nb:0.010%以上0.100%以下、B:0.0001%以上0.0050%以下のうちから選ばれる少なくとも1種の元素を含有する高強度溶融亜鉛めっき鋼板の製造方法。
[3]上記[1]または[2]において、さらに、成分組成として、質量%で、Mo:0.01%以上0.50%以下、Cr:0.30%以下、Ni:0.50%以下、Cu:1.00%以下、V:0.500%以下、Sb:0.10%以下、Sn:0.10%以下、Ca:0.0100%以下、REM:0.010%以下のうちから選ばれる少なくとも1種の元素を含有する高強度溶融亜鉛めっき鋼板の製造方法。
[4]上記[1]~[3]のいずれかにおいて、前記第1加熱工程に供される鋼板の製造において、鋼スラブに、熱間圧延を施し、次いで、酸洗によりスケールを除去した後、鋼板表面が雰囲気に暴露されない状態でH2濃度1.0vol%以上25.0vol%以下、露点が10℃以下の雰囲気中で、600℃以上の温度で600s以上21600s以下保持する熱処理工程を行う高強度溶融亜鉛めっき鋼板の製造方法。
[5]上記[1]~[4]のいずれかにおいて、前記めっき処理工程後の鋼板に、さらに合金化処理を行う合金化処理工程を有する高強度溶融亜鉛めっき鋼板の製造方法。
C:0.040%以上0.500%以下、Si:0.80%以下、Mn:1.80%以上4.00%以下、P:0.100%以下、S:0.0100%以下、Al:0.100%以下、N:0.0100%以下を含有し、残部がFeおよび不可避的不純物からなる。また、上記成分に加えて、さらに、Ti:0.010%以上0.100%以下、Nb:0.010%以上0.100%以下、B:0.0001%以上0.0050%以下のうちから選ばれる少なくとも1種の元素を含有してもよい。また、上記成分に加えて、さらに、Mo:0.01%以上0.50%以下、Cr:0.30%以下、Ni:0.50%以下、Cu:1.00%以下、V:0.500%以下、Sb:0.10%以下、Sn:0.10%以下、Ca:0.0100%以下、REM:0.010%以下のうちから選ばれる少なくとも1種の元素を含有してもよい。以下、各成分について説明する。
Cはオーステナイト生成元素であり、焼鈍板組織を複合化し、強度と延性の向上に有効な元素である。強度と延性の向上のために、Cの含有量は0.040%以上とする。一方、Cの含有量が0.500%を超えると、溶接部および熱影響部の硬化が著しく、溶接部の機械的特性が劣化し、スポット溶接性、アーク溶接性等が低下する。よって、Cの含有量は0.500%以下とする。
Siはフェライト生成元素であり、焼鈍板のフェライトの固溶強化および加工硬化能の向上に有効な元素でもある。一方、Siの含有量が0.80%を超えると、焼鈍中に鋼板表面でSiが酸化物を形成してめっき性を劣化させる。したがって、Siの含有量は0.80%以下とする。
Mnは、オーステナイト生成元素であり、焼鈍板の強度確保に有効な元素である。この強度確保のためには、Mnの含有量は1.80%以上とする。ただし、Mnの含有量が4.00%を超えると、焼鈍中に鋼板表面で多量の酸化物を形成してなる表層が、めっき外観を劣化させる。このため、Mnの含有量は4.00%以下とする。
Pは、鋼の強化に有効な元素である。鋼の強化の観点から、Pの含有量は0.001%以上であることが好ましい。ただし、Pの含有量が0.100%を超えると、粒界偏析により脆化を引き起こし、耐衝撃性を劣化させる。したがって、Pの含有量は0.100%以下とする。
Sは、MnSなどの介在物となって、耐衝撃性の劣化や溶接部のメタルフローに沿った割れの原因となる。このため、Sの含有量は極力低い方がよい。そこで、Sの含有量は0.0100%以下とする。
Alの過剰な添加は、酸化物系介在物の増加による表面性状や成形性の劣化を招く。また、コスト高にもつながる。このため、Alの含有量は0.100%以下とする。好ましくは0.050%以下である。
Nは、鋼の耐時効性を劣化させる元素であり、少ないほど好ましく、0.0100%を超えると耐時効性の劣化が顕著となる。したがって、Nの含有量は0.0100%以下とする。
Tiは鋼板中でCまたはNと微細炭化物や微細窒化物を形成することにより、鋼板の強度向上に寄与する元素である。この効果を得るためには、Tiの含有量は0.010%以上であることが好ましい。一方、Tiの含有量が0.100%を超えるとこの効果が飽和する。このため、Tiの含有量は0.100%以下が好ましい。
Nbは固溶強化または析出強化により強度向上に寄与する元素である。この効果を得るためには、Nbの含有量は0.010%以上であることが好ましい。一方、Nbの含有量が0.100%を超えると鋼板の延性を低下させ、加工性が劣化する場合がある。このため、Nbの含有量は0.100%以下が好ましい。
Bは焼入れ性を高め、鋼板の強度向上に寄与する元素である。この効果を得るためには、Bの含有量は0.0001%以上が好ましい。一方、Bを過剰に含有すると延性の低下を招き、加工性が劣化する場合がある。また、Bの過剰な含有はコストアップの原因ともなる。このため、Bの含有量は0.0050%以下が好ましい。
Moは、オーステナイト生成元素であり、焼鈍板の強度確保に有効な元素である。強度確保の観点から、Moの含有量は0.01%以上が好ましい。しかし、Moは合金コストが高いため、含有量が多いと、コストアップの要因になる。このため、Moの含有量は0.50%以下が好ましい。
Crは、オーステナイト生成元素であり、焼鈍板の強度確保に有効な元素である。一方、Crの含有量が0.30%を超えると、焼鈍中に鋼板表面で酸化物を形成しめっき外観を劣化させる場合がある。したがって、Crの含有量は0.30%以下が好ましい。
Ni、Cu、Vは鋼の強化に有効な元素であり、本発明で規定した範囲内であれば鋼の強化に使用して差し支えない。鋼を強化するためには、Niの含有量は0.05%以上が好ましく、Cuの含有量は0.05%以上が好ましく、Vの含有量は0.005%以上が好ましい。しかしながら、Niは0.50%、Cuは1.00%、Vは0.500%をそれぞれ超えて過剰に添加すると、著しい強度上昇による延性の低下の懸念が生じる場合がある。また、これらの元素の過剰な含有は、コストアップの要因にもなる。したがって、これらの元素を添加する場合には、その含有量は、Niは0.50%以下、Cuは1.00%以下、Vは0.500%以下が好ましい。
SbおよびSnは鋼板表面付近の窒化を抑制する作用がある。窒化の抑制のためには、Sbの含有量は0.005%以上、Snの含有量は0.005%以上が好ましい。ただし、上記効果はSbの含有量、Snの含有量がそれぞれ0.10%を超えると飽和する。したがって、これらの元素を添加する場合には、Sbの含有量は0.10%以下、Snの含有量は0.10%以下が好ましい。
Caは、MnSなど硫化物の形状制御によって延性を向上させる効果がある。この効果を得るためには、Caの含有量は0.0010%以上が好ましい。ただし、上記効果は0.0100%を超えると飽和する。このため、添加する場合には、Caの含有量は0.0100%以下が好ましい。
REMは、硫化物系介在物の形態を制御し、加工性の向上に寄与する。加工性向上の効果を得るためには、REMの含有量は0.001%以上が好ましい。また、REMの含有量が0.010%を超えると、介在物の増加を引き起こし加工性を劣化させる場合がある。したがって、添加する場合には、REMの含有量は0.010%以下が好ましい。
以下、上記熱処理工程について、詳細に説明する。
熱処理工程とは、酸洗工程後の鋼板を、鋼板表面が雰囲気に暴露されない状態でH2濃度が1.0vol%以上25.0vol%以下、露点が10℃以下の雰囲気中で600℃以上の温度で、600s以上21600s以下の時間保持する工程である。
この熱処理工程は熱間圧延後の鋼板中のオーステナイト相にMnを濃化させるために行なう。一般的に熱間圧延後の鋼板組織はフェライト相、オーステナイト相、パーライト相、ベイナイト相、セメンタイト相などの複数の相からなり、このうちオーステナイト相にMnを濃化させることにより、最終製品である溶融亜鉛めっき鋼板の延性の向上が見込まれる。
熱処理工程の温度が600℃未満または保持時間が600s未満ではオーステナイト相へのMn濃化が進行しないおそれがある。温度の上限は特に設けないが、850℃を超えるとオーステナイト相へのMn濃化が飽和するだけでなく、コストアップにつながる。よって、温度は850℃以下が好ましい。一方、21600sを超えて保持する場合、オーステナイト相へのMn濃化が飽和し、最終製品の延性への効き代が小さくなるだけでなく、コストアップにつながる。したがって、熱処理は600℃以上の温度で、600s以上21600s以下の保持時間とすることが好ましい。
この熱処理工程では、熱処理工程後の第1加熱工程および第2加熱工程への影響を避けるため、長時間の熱処理においても鋼板表面の酸化を抑制する。そのために、鋼板表面を雰囲気に暴露しないことが好ましい。「鋼板表面を雰囲気に暴露しない」とは、鋼板の両表面が雰囲気に暴露しない状態のみならず、鋼板の一方の表面が雰囲気に暴露しない状態をも含む。鋼板の厚さ面は端面であり、前記表面には該当しない。鋼板表面を雰囲気に暴露しない状態とするため、例えば真空炉焼鈍など完全に雰囲気を遮断する方法が上げられるが、該方法ではコスト面での課題が大きい。通常工程を前提とすると、鋼板コイルをきつく巻き、いわゆるタイトコイルとすることにより、鋼板と鋼板の間に雰囲気が侵入することを抑制することができる。なお、コイル最外周面は、後工程の加熱時には通常溶接部近傍となり、製品としては切除される。加熱を連続設備で行わない場合は、最外周面は切除して製品とする。
また、上記のタイトコイルとした場合でも、Feが酸化する雰囲気ではコイル端面が酸化し、コイル内部まで侵食して、最終製品のめっき外観を損なうおそれがある。したがって、長時間の熱処理においてもFe酸化を抑制するため、H2濃度は十分な量である1.0vol%以上が好ましい。H2濃度25.0vol%超ではコストアップにつながる。したがって、H2濃度は1.0vol%以上25.0vol%以下が好ましい。H2以外の残部はN2、H2Oおよび不可避的不純物である。
また同様に、露点が10℃を超えるとコイル端面のFeが酸化されるおそれがあるので、露点は10℃以下が好ましい。
H2濃度が0.05vol%以上25.0vol%以下、露点が-45℃以上-10℃以下の雰囲気中、750℃以上880℃以下の温度域で20s以上600s以下保持する第1加熱工程と、前記第1加熱工程後の鋼板を冷却する冷却工程と、前記冷却工程後の鋼板を圧下率が0.3%以上2.0%以下の条件で圧延を施す圧延工程と、前記圧延工程後の鋼板を、酸洗減量がFe換算で0.02g/m2以上5g/m2以下となる条件で酸洗する酸洗工程と、前記酸洗工程後の鋼板を、H2濃度が0.05vol%以上25.0vol%以下、露点が-10℃以下の雰囲気中、720℃以上860℃以下における任意の温度又は温度域で20s以上300s以下保持する第2加熱工程と、前記第2加熱工程後の鋼板に、溶融亜鉛めっき処理を施すめっき処理工程を行う。なお、第1加熱工程及び第2加熱工程における保持時間の単位「s」は「秒」を意味する。これらの第1加熱工程、冷却工程、圧延工程、酸洗工程、第2加熱工程およびめっき処理工程は連続設備で行っても、別々の設備で行っても構わない。
以下、詳細に説明する。
第1加熱工程とは、上記鋼板を、H2濃度が0.05~25.0vol%、露点が-45~-10℃の雰囲気中、750~880℃の温度域で、20s以上600s以下保持する工程である。第1加熱工程では、Feが酸化しない範囲で、Mnを鋼板表面で酸化させる。
上記鋼板を、圧延可能な温度まで冷却する。
冷却後の鋼板を圧下率が0.3%以上2.0%以下の条件で圧延を施す。この工程は第1加熱工程後の鋼板を、軽度に圧延することで、鋼板表面に形成した酸化物を鋼板表面に押し込み、鋼板表面に微小な凹凸を付与することで、めっき密着性を向上させるために行うものである。圧下率が0.3%未満では、鋼板表面に十分な凹凸を付与できない場合がある。また、圧下率が2.0%を超えると鋼板に歪が多く導入され、次の酸洗工程で酸洗が促進され、圧延工程で形成した凹凸が消滅する場合がある。したがって、圧下率は0.3%以上2.0%以下とする。
圧延工程後の鋼板表面を、酸洗減量がFe換算で0.02g/m2以上5g/m2以下となる条件で酸洗する。この工程は、鋼板の表面を清浄化すると共に第1加熱工程において鋼板の表面に形成した酸に可溶な酸化物を除去するために行うものである。
酸洗減量のFe換算値は通板前後の酸洗液中のFe濃度変化と通板材の面積から求めた。
酸洗処理後の鋼板を、H2濃度が0.05vol%以上25.0vol%以下、露点が-10℃以下の雰囲気中、720℃以上860℃以下の温度域で20s以上300s以下保持する。第2加熱工程は、鋼板表面を活性化し鋼板にめっきを施すために行うものである。
めっき処理工程は、上記の処理を施した後に鋼板を冷却し、鋼板を溶融亜鉛めっき浴に浸漬して溶融亜鉛めっきを施す工程である。
必要に応じて、めっき処理工程後の鋼板に、さらに合金化処理を行う。合金化処理の条件は特に限定されないが、合金化処理温度は460℃超え580℃未満が好ましい。460℃以下では合金化進行が遅く、580℃以上では過合金により地鉄界面に生成する硬くて脆いZn-Fe合金層が生成し過ぎてめっき密着性が劣化する場合がある。
また、一部の鋼板は、0.10~2.0%のAlを含有したZn浴にてめっき処理を行い、次いで、表2~表6に示す条件で合金化処理を行った。
引張試験は、引張方向が鋼板の圧延方向と直角方向となるようにサンプルを採取したJIS5号試験片を用いて、JIS Z 2241に準拠して行い、TS(引張強度)およびEL(全伸び)を測定した。
不めっきやピンホールなどの外観不良の有無を目視にて判断し、外観不良がない場合には良好(○)、外観不良がわずかにあるが概ね良好である場合には概ね良好(△)、外観不良がある場合には(×)と判定した。
合金化溶融亜鉛鍍金鋼板(GA)のめっき密着性は、耐パウダリング性を評価することで評価した。具体的には、合金化溶融亜鉛めっき鋼板にセロハンテープを貼り、テープ面を90度曲げ、曲げ戻しをし、加工部の内側(圧縮加工側)に、曲げ加工部と平行に巾24mmのセロハンテープを押し当てて引き離し、セロハンテープの長さ40mmの部分に付着した亜鉛量を蛍光X線によるZnカウント数として測定し、Znカウント数を単位長さ(1m)当たりに換算した量を、下記基準に照らしてランク2以下のものを特に良好(○)、ランク3のものを良好(△)、4以上のものを不良(×)として評価した。
蛍光X線カウント数 ランク
0以上~2000未満 :1 (良)
2000以上~5000未満 :2
5000以上~8000未満 :3
8000以上~10000未満:4
10000以上 :5 (劣)
GIについては、ボールインパクト試験を行い、加工部をセロハンテープ剥離し、めっき層剥離の有無を目視判定することでめっき密着性を評価した。なお、ボールインパクト試験は、ボール質量1.8kg、落下高さ100cmで行なった。
○:めっき層の剥離なし
×:めっき層が剥離
以上の評価について、得られた結果を条件と併せて表2~表6に示す。
本発明例の高強度溶融亜鉛めっき鋼板は、熱処理工程を行うことにより全伸びが向上している。例えば、A鋼を使用したNo.1~10とNo.105~111の全伸びを対比すると、熱処理工程を行ったNo.105~111で全伸びが向上している。また、U鋼を使用したNo.141~147においても、熱処理工程を行ったNo.142~147で全伸びが向上している。
Claims (5)
- 成分組成として、質量%で、C:0.040%以上0.500%以下、Si:0.80%以下、Mn:1.80%以上4.00%以下、P:0.100%以下、S:0.0100%以下、Al:0.100%以下、N:0.0100%以下を含有し、残部がFeおよび不可避的不純物からなる鋼板に対して、
H2濃度が0.05vol%以上25.0vol%以下、露点が-45℃以上-10℃以下の雰囲気中、750℃以上880℃以下の温度域で20s以上600s以下保持する第1加熱工程、
前記第1加熱工程後の鋼板を冷却する冷却工程と、
前記冷却工程後の鋼板を圧下率が0.3%以上2.0%以下の条件で圧延を施す圧延工程と、
前記圧延工程後の鋼板を、酸洗減量がFe換算で0.02g/m2以上5g/m2以下となる条件で酸洗する酸洗工程と、
前記酸洗工程後の鋼板を、H2濃度が0.05vol%以上25.0vol%以下、露点が-10℃以下の雰囲気中、720℃以上860℃以下の温度域で20s以上300s以下保持する第2加熱工程と、
前記第2加熱工程後の鋼板に、溶融亜鉛めっき処理を施すめっき処理工程を有する高強度溶融亜鉛めっき鋼板の製造方法。 - さらに、成分組成として、質量%で、Ti:0.010%以上0.100%以下、Nb:0.010%以上0.100%以下、B:0.0001%以上0.0050%以下のうちから選ばれる少なくとも1種の元素を含有する請求項1に記載の高強度溶融亜鉛めっき鋼板の製造方法。
- さらに、成分組成として、質量%で、Mo:0.01%以上0.50%以下、Cr:0.30%以下、Ni:0.50%以下、Cu:1.00%以下、V:0.500%以下、Sb:0.10%以下、Sn:0.10%以下、Ca:0.0100%以下、REM:0.010%以下のうちから選ばれる少なくとも1種の元素を含有する請求項1または2に記載の高強度溶融亜鉛めっき鋼板の製造方法。
- 前記第1加熱工程に供される鋼板の製造において、鋼スラブに、熱間圧延を施し、次いで、酸洗によりスケールを除去した後、鋼板表面が雰囲気に暴露されない状態でH2濃度1.0vol%以上25.0vol%以下、露点が10℃以下の雰囲気中で、600℃以上の温度で600s以上21600s以下保持する熱処理工程を行う請求項1~3のいずれか一項に記載の高強度溶融亜鉛めっき鋼板の製造方法。
- 前記めっき処理工程後の鋼板に、さらに合金化処理を行う合金化処理工程を有する請求項1~4のいずれか一項に記載の高強度溶融亜鉛めっき鋼板の製造方法。
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