WO2018221992A1 - Tôle d'acier pour élément formé par pressage à chaud présentant une excellente adhérence de la peinture et une excellente résistance à la corrosion post-peinture, et son procédé de fabrication - Google Patents

Tôle d'acier pour élément formé par pressage à chaud présentant une excellente adhérence de la peinture et une excellente résistance à la corrosion post-peinture, et son procédé de fabrication Download PDF

Info

Publication number
WO2018221992A1
WO2018221992A1 PCT/KR2018/006259 KR2018006259W WO2018221992A1 WO 2018221992 A1 WO2018221992 A1 WO 2018221992A1 KR 2018006259 W KR2018006259 W KR 2018006259W WO 2018221992 A1 WO2018221992 A1 WO 2018221992A1
Authority
WO
WIPO (PCT)
Prior art keywords
steel sheet
hot press
temperature
corrosion resistance
less
Prior art date
Application number
PCT/KR2018/006259
Other languages
English (en)
Korean (ko)
Inventor
오진근
김성우
신현정
조아라
Original Assignee
주식회사 포스코
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020170101563A external-priority patent/KR102010048B1/ko
Priority to MX2019014326A priority Critical patent/MX2019014326A/es
Priority to CN202211143165.5A priority patent/CN115555475A/zh
Priority to JP2019565877A priority patent/JP7058675B2/ja
Priority to US16/617,798 priority patent/US11141953B2/en
Priority to EP18810671.0A priority patent/EP3632587B1/fr
Priority to EP22155560.0A priority patent/EP4012064B1/fr
Priority to PL18810671.0T priority patent/PL3632587T3/pl
Application filed by 주식회사 포스코 filed Critical 주식회사 포스코
Priority to ES18810671T priority patent/ES2914361T3/es
Priority to BR112019025146-4A priority patent/BR112019025146B1/pt
Priority to CN201880036329.XA priority patent/CN110709184B/zh
Publication of WO2018221992A1 publication Critical patent/WO2018221992A1/fr
Priority to US17/394,830 priority patent/US20210362472A1/en
Priority to JP2022065569A priority patent/JP7464649B2/ja
Priority to US18/586,317 priority patent/US20240198633A1/en

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
    • 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
    • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00

Definitions

  • the present invention relates to a steel sheet for hot press forming member excellent in coating adhesion and corrosion resistance after painting, and a manufacturing method thereof.
  • the hot press forming method is a method of forming a low temperature structure such as martensite in a steel sheet by processing the steel sheet at a high temperature suitable for processing and then quenching it at a low temperature to increase the strength of the final product.
  • a hot press molding method is a method of forming a low temperature structure such as martensite in a steel sheet by processing the steel sheet at a high temperature suitable for processing and then quenching it at a low temperature to increase the strength of the final product.
  • US Patent No. 6,296,805 has been proposed.
  • the steel plate subjected to aluminum plating is used in a process of heating and quenching (hot post-heat treatment) after hot press molding or normal temperature molding. Since the aluminum plating layer is present on the steel sheet surface, the steel sheet is not oxidized at the time of heating.
  • the member obtained after heating and molding is still exposed to the corrosive environment.
  • base iron diffuses into the aluminum plating layer, and a hard Fe-Al-based plating layer is formed on the surface of the steel sheet.
  • the Fe-Al-based plating layer cracks occur in the plating layer because it is vulnerable as hard. There is a concern that the steel sheet may be exposed to a corrosive environment.
  • the hot press formed member is provided with a coating layer, which is required to have excellent paint adhesion.
  • a steel sheet for hot press molding that can produce a hot press molding member excellent in paint adhesion and consequently excellent in corrosion resistance after painting.
  • the steel sheet for hot press forming includes a holding plate and a plated layer formed on the surface of the plate, and the area ratio occupied by the voids in the cross section of the surface layer observed by cutting the plated layer in the thickness direction. It may be more than 10% of the area of the.
  • the area ratio occupied by the voids in the cross section of the surface layer portion observed by cutting the plating layer in the thickness direction may be 15% or more of the total surface layer portion.
  • the plating layer may be an aluminum alloy plating layer.
  • the aluminum alloy plating layer may have an average content of Fe of at least 30% by weight.
  • the aluminum alloy plating layer may have an average content of Fe of at least 40% by weight.
  • the base steel sheet by weight% C: 0.04 ⁇ 0.5%, Si: 0.01 ⁇ 2%, Mn: 0.01 ⁇ 10%, Al: 0.001 ⁇ 1.0%, P: 0.05% or less, S It may have a composition comprising: 0.02% or less, N: 0.02% or less, residual Fe and other unavoidable impurities.
  • the composition of the steel sheet is weight percent, one or more sums selected from the group consisting of Cr, Mo and W: 0.01 to 4.0%, in the group consisting of Ti, Nb, Zr and V
  • the sum of the species or more may further include at least one of 0.001 to 0.4%, Cu + Ni: 0.005 to 2.0%, Sb + Sn: 0.001 to 1.0%, and B: 0.0001 to 0.01%.
  • a method of manufacturing a steel sheet for a hot press-forming member comprising: obtaining an aluminum plated steel sheet by aluminum plating and winding the surface of the steel sheet; Step an aluminum alloy plated steel sheet by annealing the aluminum plated steel sheet; And cooling the aluminum alloy plated steel sheet, wherein the aluminum plating amount is 30 to 200 g / m 2 based on one side of the steel sheet, and the winding tension is 0.5 to 5 kg /.
  • the annealing is carried out at a heating temperature range of 550 ⁇ 750 °C 30 bun ⁇ 50 hours at a appeal placed, when heated in room temperature during the annealing to the heating temperature, the average temperature increase rate 20 ⁇ 100 °C / h, but the average temperature increase rate of 400 ⁇ 500 °C section 1 ⁇ 15 °C / h, the heating temperature -50 °C ⁇ heating temperature section of the heating rate is 1 ⁇ 15 °C / h, in the above annealing furnace
  • the difference between the atmosphere temperature and the steel sheet temperature is 5 to 80 ° C., and the cooling may be performed at a rate of 50 ° C./h or less to 500 ° C. in the step of cooling the aluminum alloy plated steel sheet.
  • the base steel sheet by weight% C: 0.04 ⁇ 0.5%, Si: 0.01 ⁇ 2%, Mn: 0.01 ⁇ 10%, Al: 0.001 ⁇ 1.0%, P: 0.05% or less, S It may have a composition comprising: 0.02% or less, N: 0.02% or less, residual Fe and other unavoidable impurities.
  • the composition of the steel sheet is weight percent, one or more sums selected from the group consisting of Cr, Mo and W: 0.01 to 4.0%, in the group consisting of Ti, Nb, Zr and V
  • the sum of the species or more may further include at least one of 0.001 to 0.4%, Cu + Ni: 0.005 to 2.0%, Sb + Sn: 0.001 to 1.0%, and B: 0.0001 to 0.01%.
  • the steel sheet for hot press forming contains voids in the surface layer portion, the surface roughness of the member obtained after hot press forming can be greatly increased, resulting in good paint adhesion, and as a result, good post-painting corrosion resistance. You can get it.
  • 1 is a cross-sectional photograph of the cut surface of the plated layer of the steel sheet according to an embodiment of the present invention.
  • Example 2 is a component profile obtained by analyzing a plated layer of a steel sheet manufactured according to Inventive Example 1 by using a GDS analyzer.
  • FIG. 3 is a scanning electron micrograph (rear scattering electron image) of observing a cross section of a plated layer of a steel sheet manufactured according to Inventive Example 1.
  • FIG. 3 is a scanning electron micrograph (rear scattering electron image) of observing a cross section of a plated layer of a steel sheet manufactured according to Inventive Example 1.
  • Example 4 is a component profile obtained by analyzing a plated layer of a steel sheet manufactured according to Inventive Example 2 with a GDS analyzer.
  • FIG. 5 is a scanning electron micrograph (backscattered electron image) of observing a cross section of a plated layer of a steel sheet prepared according to Inventive Example 2.
  • FIG. 5 is a scanning electron micrograph (backscattered electron image) of observing a cross section of a plated layer of a steel sheet prepared according to Inventive Example 2.
  • 6 is a component profile obtained by analyzing a plated layer of a steel sheet manufactured by Comparative Example 1 by a GDS analyzer.
  • FIG. 7 is a scanning electron microscope photograph of a cross section of a plated layer of a steel sheet manufactured according to Comparative Example 1.
  • FIG. 9 is a scanning electron microscope photograph of a cross section of a plated layer of a steel sheet manufactured by Comparative Example 2.
  • FIG. 9 is a scanning electron microscope photograph of a cross section of a plated layer of a steel sheet manufactured by Comparative Example 2.
  • 10 is a component profile obtained by analyzing a plated layer of a steel sheet manufactured by Comparative Example 3 with a GDS analyzer.
  • FIG. 11 is a scanning electron microscope photograph of a cross section of a plated layer of the steel sheet manufactured by Comparative Example 3.
  • FIG. 11 is a scanning electron microscope photograph of a cross section of a plated layer of the steel sheet manufactured by Comparative Example 3.
  • the member refers to a part or a part material manufactured by hot press molding.
  • a steel plate means the thing before hot press molding, and this steel plate may be wound up during a manufacturing process, and may have a coil form, and this time is also called a coil.
  • the steel sheet of the present invention is composed of a plated steel plate and a plated layer formed on the surface of the plated steel plate, and has a plurality of pores (pore) in the surface layer portion of the plated layer.
  • This is a phenomenon that cannot be observed in the conventional aluminum plated steel sheet for hot press forming.
  • voids are hardly generated in the surface layer by hot-dip aluminum plating, whereas in the steel sheet according to the present embodiment, the surface layer portion of the plated layer is The main feature is that a number of voids are formed.
  • the surface layer means a region within 10 ⁇ m deep from the surface (if the surface layer is rough, the depth is measured from each point of the rough surface).
  • Alloying is performed to the surface of the member for hot press forming obtained by hot press molding an aluminum plated steel plate.
  • the resulting alloy layer is relatively stable compared with the non-alloyed aluminum plating layer, so the reactivity with the phosphate to improve the coating adhesion is weak, and there is little room for improvement of the coating adhesion only by the usual phosphate treatment.
  • the roughness during the alloying in the hot press molding process increases the adhesion to the paint itself to some level, but there is a limit to the improvement.
  • the voids are collapsed in future press molding, thereby contributing to increase the roughness.
  • the area ratio occupied by the voids in the cross section of the surface layer portion observed by cutting the plating layer of the steel sheet in the thickness direction may be 10% or more with respect to the total surface layer portion, or may be 15% or more.
  • the surface roughness is improved when the steel sheet is hot press formed, thereby greatly improving the coating adhesion and the corrosion resistance after painting.
  • the upper limit of the surface roughness does not need to be particularly limited in terms of paint adhesion or post-painting corrosion resistance, but the void ratio may be usually determined to be 70% or less or 60% or less.
  • There may be various methods for measuring the void ratio but in one embodiment of the present invention, a method for measuring the ratio of the portion where the void exists by using an image analyzer may be used.
  • the plating layer in order to form a plating layer having a high proportion of voids in the surface layer portion on the surface of the steel sheet, the plating layer may be an aluminum alloy plating layer, and in one embodiment, an Al-Fe alloy plating layer.
  • the Al—Fe alloy plating layer may be obtained by alloying an Al plated steel sheet under appropriate conditions. That is, in the present invention, when the Al-coated steel sheet is heated under appropriate conditions, diffusion occurs between Al of the plating layer and Fe of the base steel sheet, and Al and Fe are alloyed. In the process, a plurality of voids are formed in the surface layer portion. will be.
  • the average content of Fe in the plating layer may be 30% by weight or more, more preferably 40% by weight or more, and more preferably 50% by weight or more. That is, since sufficient voiding may occur to obtain voids in the surface layer portion, the average content of Fe in the plating layer may be 30% by weight, 40% by weight or 50% by weight or more.
  • the upper limit of the average content of Fe does not need to be specifically determined, considering the efficiency of alloying etc., it may also be set to 80 weight% or less.
  • the average content of Fe refers to the average content of Fe in the entire plating layer, but there may be various measurement methods.
  • the surface of the plating layer from the surface of the plating layer by Glow Discharge Spectrometry (GDS) method Integrating the content curve of Fe according to the depth (thickness) appearing when analyzed to the interface of can be used as the value divided by the plating layer thickness.
  • GDS Glow Discharge Spectrometry
  • the steel sheet of the present invention is a steel sheet for hot press molding, and if used for hot press molding, its composition is not particularly limited. However, according to one aspect of the present invention in terms of weight percent (hereinafter, unless noted otherwise, it is necessary to note that the composition of the steel sheet and the plating layer is based on weight), C: 0.04-0.5%, Si: 0.01-2%, Mn: 0.01-10%, Al: 0.001-1.0%, P: 0.05% or less, S: 0.02% or less and N: 0.02% or less.
  • the C may be added in an appropriate amount as an essential element for increasing the strength of the heat treatment member. That is, in order to ensure sufficient strength of the heat treatment member, the C may be added at least 0.04%.
  • the lower limit of the C content may be 0.1%. However, if the content is too high, when producing cold rolled material, the cold rolled material is too high when cold-rolled and the cold rolled property is greatly inferior, and the spot weldability is greatly degraded. It may be added at 0.5% or less to ensure weldability.
  • the C content may be limited to 0.45% or less and 0.4% or less.
  • the Si not only needs to be added as a deoxidizer in steelmaking, but also inhibits carbide formation which most affects the strength of the hot press forming member, and in the hot press forming, carbon is formed on the martensite lath boundary after martensite formation. It concentrates to secure residual austenite.
  • Si may be added in an amount of 0.01% or more.
  • the upper limit of the Si content may be set to 2% in order to secure sufficient plating properties when aluminum plating the steel sheet after rolling. In one embodiment of the present invention, the Si content may be limited to 1.5% or less.
  • the Mn may be added in an amount of 0.01% or more in order to secure a solid solution strengthening effect and to lower the critical cooling rate for securing martensite in the hot press forming member.
  • the Mn content may be 10% or less in terms of ensuring the hot press forming process workability, reducing manufacturing cost, and improving spot weldability by appropriately maintaining the strength of the steel sheet, and one embodiment of the present invention. Can be 9% or less, or 8% or less.
  • the Al may be added in an amount of 0.001% or more since the deoxidation action in steelmaking together with Si may increase the cleanliness of the steel.
  • the content of Al may be 1.0% or less in order to prevent the Ac3 temperature from becoming too high so that heating required in hot press molding may be performed in an appropriate temperature range.
  • P is present as an impurity in the steel, and the smaller the content is, the more advantageous. Therefore, in one embodiment of the present invention, P may be included in an amount of 0.05% or less. In another embodiment of the invention, P may be limited to 0.03% or less. Since less P is an advantageous impurity element, there is no need to specifically set an upper limit of the content. However, in order to lower the P content excessively, the manufacturing cost may increase, and when considering this, the lower limit may be 0.001%.
  • the maximum content is 0.02% (preferably 0.01% or less) because it is an element that inhibits the ductility, impact property and weldability of the member.
  • the lower limit of the content may be 0.0001%.
  • the N is an element included as an impurity in the steel, and in order to reduce the sensitivity to crack generation during continuous slab casting, and to secure the impact characteristics, the lower the content, the more advantageously, it may be included in 0.02% or less. Although the lower limit needs to be specifically determined, the N content may be set to 0.001% or more in one embodiment in consideration of an increase in manufacturing cost.
  • the Cr, Mo and W can secure the strength and crystallization through improving the hardenability, and the precipitation strengthening effect, these one or more may be added 0.01% or more based on the total content.
  • the content may be limited to 4.0% or less in order to ensure weldability of the member.
  • the content of these elements exceeds 4.0%, further increase in effect is also weak, so if the content is limited to 4.0% or less, it is possible to prevent the increase in cost due to the addition of additional elements.
  • the Ti, Nb and V are effective in improving the steel sheet of the heat-treating member by forming fine precipitates and improving the retained austenite and impact toughness by refining grains, and therefore, at least one of them may be added in an amount of 0.001% or more. have. However, if the added amount exceeds 0.4%, the effect is not only saturated, but excessive cost may be caused by the addition of ferroalloy.
  • Cu and Ni are elements that form fine precipitates to improve strength.
  • the sum of one or more of these components may be 0.005% or more. However, if the value exceeds 2.0%, the excessive cost increases, so the upper limit is 2.0%.
  • the Sb and Sn may be concentrated on the surface during annealing heat treatment for Al-Si plating to suppress the formation of Si or Mn oxide on the surface to improve plating properties. It may be added 0.001% or more in order to obtain such an effect. However, if the added amount exceeds 1.0%, the upper limit is 1.0% because not only excessive ferroalloy costs but also solid solution at the slab grain boundary may cause coil edge cracks during hot rolling.
  • the above-mentioned B is an element which can not only improve hardenability by addition of a small amount but also segregate in the old austenite grain boundary and suppress brittleness of the hot press-molded member due to grain boundary segregation of P or / and S. Therefore, B may be added at least 0.001%. However, if the content exceeds 0.01%, the effect is not only saturated, but also causes brittleness in hot rolling, so the upper limit thereof may be 0.01%, and in one embodiment, the B content may be 0.005% or less.
  • Iron and unavoidable impurities are mentioned as remainder other than the above-mentioned component, and if it is a component which can be contained in a steel plate for hot forming, it will not specifically limit.
  • the steel sheet of the present invention can be obtained by using hot-rolled or cold-rolled steel sheet, by performing hot-dip aluminum plating on the surface of the steel sheet and performing annealing treatment on the coated steel sheet.
  • the surface of the rolled steel sheet may be subjected to aluminum plating.
  • Aluminum plating is usually required by AlSi plating (type 80), containing at least 80% Al and 5-20% Si, optionally with additional elements, or at least 90% Al (type II). Depending on the plating, any plating containing additional elements may be used. Molten aluminum plating may be performed to form a plating layer, and annealing treatment may be performed on the steel sheet before plating. When plating, the appropriate plating amount is 30 ⁇ 200g / m 2 on one side. If the plating amount is too large, it may take an excessive time to alloy to the surface, on the contrary, if the plating amount is too small, it is difficult to obtain sufficient corrosion resistance.
  • the winding tension of the coil can be adjusted. According to the adjustment of the winding tension of the coil, the alloying behavior and the surface quality of the coil may be changed during the subsequent annealing treatment.
  • An annealing treatment is performed on the aluminum plated steel sheet by the above-described process to obtain an aluminum alloy plated steel sheet.
  • the aluminum plated steel sheet (coil) is heated in a batch annealing furnace.
  • the target heat treatment temperature and the holding time are in the range of 550 to 750 ° C based on the steel sheet temperature (in the present invention, this temperature range). It is preferable to maintain the maximum temperature reached by the material at 30 minutes to 50 hours at the heating temperature), wherein the holding time is the time from the coil temperature to the target temperature until the cooling start.
  • the plating layer may be peeled off during roll leveling, so that the heating temperature may be 550 ° C. or more for sufficient alloying. In order to ensure spot weldability, the heating temperature may be 750 ° C.
  • the holding time may be set to 30 minutes to 50 hours
  • the temperature of the steel sheet may have a pattern in which the temperature is continuously raised without cooling until the heating temperature is reached. Can be.
  • the steel sheet (coil) temperature reference for the entire temperature section (room temperature to heating temperature section)
  • the average temperature increase rate can be 20-100 degreeC / h.
  • the overall average temperature increase rate can be controlled in the above numerical range, but in one embodiment of the present invention to control the temperature increase rate of a specific temperature section as described later to achieve the problem of the present invention.
  • the average temperature increase rate of the entire temperature section may be set at 70 ° C /.
  • the average temperature increase rate of 400 to 500 ° C. is increased. It can be heated at 1 to 15 ° C / h. In one embodiment of the present invention can be the lower limit of the average temperature increase rate of 400 ⁇ 500 °C section at the time of the temperature increase to 4 °C / hr, and in another embodiment the lower limit of the average temperature increase rate of 400 ⁇ 500 °C section at the time of temperature increase It may also be 5 ° C / hr.
  • the average temperature rise rate of the heating temperature -50 ° C to the heating temperature range during heating It can be heated at 1-15 degreeC / h.
  • the lower limit of the average temperature increase rate of the section may be set at 4 ° C./h. In another embodiment, the lower limit of the average temperature increase rate of the section may be set at 5 ° C./h.
  • the difference between the ambient temperature and the steel plate temperature in the annealing furnace is 5 ⁇ 80 °C
  • the heating of the annealing furnace is a method of heating the steel sheet (coil) by raising the atmosphere temperature in the annealing furnace, rather than directly heating the steel sheet (coil).
  • the difference between the atmosphere temperature and the steel sheet temperature cannot be avoided.
  • the difference between the atmosphere temperature and the coil temperature can be set to 80 ° C or less based on the time point at which the heat treatment target temperature is reached in order to minimize the variation of the material and plating quality for each position in the steel sheet. have.
  • the temperature difference should be as small as possible, but this can be as high as 5 ° C, since it may be difficult to meet the overall average temperature rise rate conditions by slowing the rate of temperature rise.
  • the temperature of the steel sheet means that the temperature of the loaded steel plate (coil) bottom part (meaning the lowest part of the coil) is measured
  • the atmospheric temperature means the temperature measured at the center of the internal space of the heating furnace. .
  • the aluminum alloy plated steel sheet (coil) is cooled.
  • various methods such as furnace cooling, air cooling, and water cooling, can be applied.
  • the average cooling rate of the entire cooling section there is no particular limitation on the average cooling rate of the entire cooling section, and it may be rapidly cooled to improve productivity.
  • the cooling rate of the temperature section up to 500 ° C. after heating may be 50 ° C./h or less.
  • the lower limit is not particularly limited, but may be 1 ° C / h or more in consideration of productivity.
  • a cold rolled steel sheet for hot press molding having the composition of Table 1.
  • the surface of the steel sheet was plated with a type I plating bath having an Al-9% Si-2.5% Fe composition.
  • the coating amount was adjusted to 70 g / m 2 per side, and the coil was wound by adjusting the winding tension after plating to 2.2 kg / mm 2 .
  • the plated steel sheet was heated to 650 ° C. under the following conditions in an annealing furnace.
  • the cross-sectional shape of the steel sheet was formed with a plating layer formed on the outer surface of the base steel sheet, and the area ratio of the voids formed in the portion corresponding to the surface layer portion from the surface of the formed plating layer to the 10 ⁇ m thickness direction was 22.8%. there was.
  • the surface of the steel sheet having the composition shown in Table 1 was plated with a type I plating bath having an Al-9% Si-2.5% Fe composition. During plating, the coating amount was adjusted to 80g / m 2 per side, and the coil was wound by adjusting the winding tension after plating to 2kg / mm 2 .
  • the plated steel plate was then heated to 700 ° C. under the following conditions in an annealing furnace.
  • the cross-sectional shape of the steel sheet was formed with a plating layer formed on the outer surface of the base steel sheet, and the area ratio of the voids formed in the portion corresponding to the surface layer portion from the surface of the formed plating layer to the 10 ⁇ m thickness direction was 28.5%. there was.
  • the cross-sectional shape of the steel sheet was that a plating layer was formed on the outer surface of the base steel sheet, and almost no voids were formed in the portion corresponding to the surface layer portion from the surface of the formed plating layer to a point of 10 ⁇ m in the thickness direction. there was.
  • the area ratio of the formed voids was 0%.
  • a component profile of the form as shown in FIG. 8 was obtained, and the average Fe content calculated based on this was 21% by weight.
  • a plating layer was formed on the outer surface of the steel sheet, and almost no void was formed in the portion corresponding to the surface layer portion from the surface of the formed plating layer to a point of 10 ⁇ m in the thickness direction. there was.
  • the area ratio of the formed voids was 0%.
  • the surface of the steel sheet having the composition shown in Table 1 was plated with a type I plating bath having an Al-9% Si-2.5% Fe composition. During plating, the coating amount was adjusted to 90 g / m 2 per side, and the coil was wound by adjusting the winding tension after plating to 2 kg / mm 2 .
  • the plated steel plate was then heated to 650 ° C. under the following conditions in an annealing furnace.
  • the plate After heating, the plate was maintained at the same temperature for 10 hours, after which the steel sheet was cooled to an average cooling rate of 45 ° C./h up to 500 ° C., and then cooled to an average cooling rate of 60 ° C./h up to 100 ° C. to obtain a hot press forming steel sheet. .
  • the cross-sectional shape of the steel sheet was formed with a plating layer formed on the outer surface of the base steel sheet, and the area ratio of the voids formed in the portion corresponding to the surface layer portion from the surface of the formed plating layer to a thickness point of 10 ⁇ m was 3.5%. there was.
  • the steel sheets of Inventive Examples 1 and 2 and Comparative Examples 1 to 3 were heated to 950 ° C. and maintained at the above temperature for 5 minutes, and then subjected to hot press molding to quench while pressing by a press to obtain a hot press molding member.
  • Inventive Example 1 and Inventive Example 2 have a surface roughness (Ra) of 2.01 and 2.23 ⁇ m, respectively, Comparative Example 1, Comparative Example 2 and Comparative Example 3 has a surface roughness (Ra) of 1.12, 1.27 And 1.48 ⁇ m.
  • Phosphate treatment and electrodeposition coating were performed on the members obtained from the respective examples and comparative examples, crosses were formed on the surface of the steel sheet, and then a cyclic corrosion test was carried out to cause blisters on the crosses. Was observed.
  • the composite corrosion test was carried out in a cycle of 24 hours of 'wet atmosphere exposure 2 hours-salt spray exposure 2 hours-drying 1 hour-wet atmosphere exposure 6 hours-drying 2 hours-wet atmosphere exposure 6 hours-drying 2 hours-cooling 3 hours'. It was time and maintained a total of 50 cycles.
  • Inventive Examples 1 and 2 were all the maximum width of the blister 1mm or less, while Comparative Examples 1, 2 and 3 are the maximum width of the blister 3.2, 2.9 and 2.4mm respectively, it can be confirmed that the corrosion resistance is poor after coating compared to the invention example there was.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

La présente invention concerne une tôle d'acier pour élément formé par pressage à chaud présentant une excellente adhérence de la peinture et une excellente résistance à la corrosion post-peinture, et son procédé de fabrication. Selon un aspect de la présente invention, une tôle d'acier destinée au pressage à chaud comprend une tôle d'acier de base et une couche plaquée formée sur une surface de la tôle d'acier de base, le rapport d'une surface occupée par des pores sur la totalité de la surface d'une partie de couche superficielle pouvant être supérieur ou égal à 10% dans une section transversale de la partie de couche superficielle observée lorsque la couche plaquée est découpée dans une direction d'épaisseur de celle-ci.
PCT/KR2018/006259 2017-06-01 2018-05-31 Tôle d'acier pour élément formé par pressage à chaud présentant une excellente adhérence de la peinture et une excellente résistance à la corrosion post-peinture, et son procédé de fabrication WO2018221992A1 (fr)

Priority Applications (13)

Application Number Priority Date Filing Date Title
CN201880036329.XA CN110709184B (zh) 2017-06-01 2018-05-31 涂装粘附性和涂装后耐蚀性优异的热压成型部件用钢板及其制造方法
PL18810671.0T PL3632587T3 (pl) 2017-06-01 2018-05-31 Blacha stalowa na element kształtowany na gorąco mająca doskonalą przyczepność do farby i odporność na korozję po malowaniu oraz sposób jej wytwarzania
JP2019565877A JP7058675B2 (ja) 2017-06-01 2018-05-31 塗装密着性及び塗装後耐食性に優れた熱間プレス成形部材用鋼板及びその製造方法
US16/617,798 US11141953B2 (en) 2017-06-01 2018-05-31 Steel sheet for hot press formed member having excellent painting adhesion and post-painting corrosion resistance
EP18810671.0A EP3632587B1 (fr) 2017-06-01 2018-05-31 Tôle d'acier pour élément formé par pressage à chaud présentant une excellente adhérence de la peinture et une excellente résistance à la corrosion post-peinture, et son procédé de fabrication
EP22155560.0A EP4012064B1 (fr) 2017-06-01 2018-05-31 Tôle d'acier pour élément formé par pressage à chaud présentant une excellente adhérence de la peinture et une excellente résistance à la corrosion post-peinture, et son procédé de fabrication
ES18810671T ES2914361T3 (es) 2017-06-01 2018-05-31 Chapa de acero para miembro conformado por prensado en caliente que tiene una excelente adherencia de la pintura y resistencia a la corrosión después de la pintura, y procedimiento de fabricación de la misma
MX2019014326A MX2019014326A (es) 2017-06-01 2018-05-31 Lamina de acero para miembro formado en prensa caliente que tiene excelente adhesion de pintura y resistencia a la corrosion de post-pintura, y metodo para manufacturarla.
CN202211143165.5A CN115555475A (zh) 2017-06-01 2018-05-31 涂装粘附性和涂装后耐蚀性优异的热压成型部件用钢板及其制造方法
BR112019025146-4A BR112019025146B1 (pt) 2017-06-01 2018-05-31 Chapa de aço para membro formado por prensagem a quente com excelente adesão da pintura e resistência à corrosão pós-pintura, e método de fabricação da mesma
US17/394,830 US20210362472A1 (en) 2017-06-01 2021-08-05 Steel sheet for hot press formed member having excellent painting adhesion and post-painting corrosion resistance, and method for manufacturing same
JP2022065569A JP7464649B2 (ja) 2017-06-01 2022-04-12 塗装密着性及び塗装後耐食性に優れた熱間プレス成形部材用鋼板及びその製造方法
US18/586,317 US20240198633A1 (en) 2017-06-01 2024-02-23 Steel sheet for hot press formed member having excellent painting adhesion and post-painting corrosion resistance, and method for manufacturing same

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20170068651 2017-06-01
KR10-2017-0068651 2017-06-01
KR10-2017-0101563 2017-08-10
KR1020170101563A KR102010048B1 (ko) 2017-06-01 2017-08-10 도장 밀착성과 도장 후 내식성이 우수한 열간 프레스 성형 부재용 강판 및 그 제조방법

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US16/617,798 A-371-Of-International US11141953B2 (en) 2017-06-01 2018-05-31 Steel sheet for hot press formed member having excellent painting adhesion and post-painting corrosion resistance
US17/394,830 Division US20210362472A1 (en) 2017-06-01 2021-08-05 Steel sheet for hot press formed member having excellent painting adhesion and post-painting corrosion resistance, and method for manufacturing same

Publications (1)

Publication Number Publication Date
WO2018221992A1 true WO2018221992A1 (fr) 2018-12-06

Family

ID=64454841

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2018/006259 WO2018221992A1 (fr) 2017-06-01 2018-05-31 Tôle d'acier pour élément formé par pressage à chaud présentant une excellente adhérence de la peinture et une excellente résistance à la corrosion post-peinture, et son procédé de fabrication

Country Status (1)

Country Link
WO (1) WO2018221992A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111575622A (zh) * 2020-05-11 2020-08-25 马鞍山钢铁股份有限公司 一种具有优异涂装性能的热成形零部件用的镀铝钢板及其制造方法及热成形零部件

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6296805B1 (en) 1998-07-09 2001-10-02 Sollac Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment
JP2004043887A (ja) * 2002-07-11 2004-02-12 Nissan Motor Co Ltd アルミニウムめっき構造部材及びその製造方法
KR20150073021A (ko) * 2013-12-20 2015-06-30 주식회사 포스코 내식성이 우수한 열간 프레스 성형용 합금도금강판 및 그 제조방법
KR101536703B1 (ko) * 2011-03-09 2015-07-14 신닛테츠스미킨 카부시키카이샤 핫 스탬핑용 강판 및 그의 제조 방법과 고강도 부품의 제조 방법
KR101569505B1 (ko) * 2014-12-24 2015-11-30 주식회사 포스코 내박리성이 우수한 hpf 성형부재 및 그 제조방법
KR101696121B1 (ko) * 2015-12-23 2017-01-13 주식회사 포스코 내수소지연파괴특성, 내박리성 및 용접성이 우수한 열간성형용 알루미늄-철 합금 도금강판 및 이를 이용한 열간성형 부재

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6296805B1 (en) 1998-07-09 2001-10-02 Sollac Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment
JP2004043887A (ja) * 2002-07-11 2004-02-12 Nissan Motor Co Ltd アルミニウムめっき構造部材及びその製造方法
KR101536703B1 (ko) * 2011-03-09 2015-07-14 신닛테츠스미킨 카부시키카이샤 핫 스탬핑용 강판 및 그의 제조 방법과 고강도 부품의 제조 방법
KR20150073021A (ko) * 2013-12-20 2015-06-30 주식회사 포스코 내식성이 우수한 열간 프레스 성형용 합금도금강판 및 그 제조방법
KR101569505B1 (ko) * 2014-12-24 2015-11-30 주식회사 포스코 내박리성이 우수한 hpf 성형부재 및 그 제조방법
KR101696121B1 (ko) * 2015-12-23 2017-01-13 주식회사 포스코 내수소지연파괴특성, 내박리성 및 용접성이 우수한 열간성형용 알루미늄-철 합금 도금강판 및 이를 이용한 열간성형 부재

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3632587A4 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111575622A (zh) * 2020-05-11 2020-08-25 马鞍山钢铁股份有限公司 一种具有优异涂装性能的热成形零部件用的镀铝钢板及其制造方法及热成形零部件
CN111575622B (zh) * 2020-05-11 2022-07-15 马鞍山钢铁股份有限公司 一种具有优异涂装性能的热成形零部件用的镀铝钢板及其制造方法及热成形零部件

Similar Documents

Publication Publication Date Title
WO2018117543A1 (fr) Tôle d'acier plaquée par pressage à chaud dotée d'une résistance élevée aux chocs, élément de moulage par pressage à chaud et son procédé de fabrication
WO2017111525A1 (fr) Tôle en acier revêtue d'alliage d'aluminium-fer pour formage par pressage à chaud, ayant d'excellentes résistance à la facture retardée par hydrogène, résistance au pelage et soudabilité et élément formé à chaud au moyen de celle-ci
WO2016104879A1 (fr) Élément de moulage hpf présentant une excellente résistance au farinage au moment du moulage sous pression, et son procédé de fabrication
WO2016104880A1 (fr) Élément de moulage hpf présentant une excellente résistance au délaminage et son procédé de fabrication
WO2017078278A1 (fr) Plaque d'acier à ultra haute résistance présentant une formabilité et aptitude à l'expansion de trou excellentes, et son procédé de fabrication
WO2015099221A1 (fr) Feuille d'acier ayant une résistance élevée et une basse densité et son procédé de fabrication
WO2016098964A1 (fr) Tôle d'acier à haute résistance laminée à froid ayant une faible non-uniformité de matériau et une excellente aptitude au formage, tôle d'acier galvanisée par immersion à chaud et procédé de fabrication associé
WO2015023012A1 (fr) Tôle d'acier à ultra-haute résistance et son procédé de fabrication
WO2015093793A1 (fr) Tôle en acier plaqué pour formage par presse à chaud ayant d'excellentes soudabilité et résistance à la corrosion, élément de formage et procédé pour sa fabrication
WO2019231023A1 (fr) Tôle d'acier plaquée d'alliage al-fe destinée à un formage à chaud, présentant d'excellentes caractéristiques de soudage twb, élément de formage à chaud et procédés de fabrication s'y rapportant
WO2016104881A1 (fr) Élément de moulage de formage à haute pression à excellentes excellentes caractéristiques de flexion et son procédé de fabrication
WO2020111702A1 (fr) Acier à haute résistance présentant une excellente durabilité et son procédé de fabrication
WO2018117724A1 (fr) Tôle d'acier laminée à chaud de résistance élevée et tôle d'acier laminée à froid d'excellente productivité continue, tôle d'acier galvanisée par immersion à chaud de résistance élevée présentant une excellente qualité de surface et une excellente adhérence de plaquage, et son procédé de fabrication
WO2020111640A1 (fr) Tôle d'acier électrique non orientée ayant une faible perte dans le fer et une excellente qualité de surface, et son procédé de fabrication
WO2018117523A1 (fr) Tôle d'acier de résistance élevée ayant d'excellentes caractéristiques d'allongement à haute température, élément pressé à chaud, et procédés de fabrication pour ladite tôle et ledit élément
WO2023022445A1 (fr) Matériau d'acier pour le formage à chaud, élément formé à chaud et procédé de fabrication associé
WO2020130675A1 (fr) Tôle d'acier laminée à froid à haute résistance possédant une excellente aptitude au cintrage, et procédé de fabrication associé
WO2016104837A1 (fr) Tôle d'acier laminée à chaud pour tôle d'acier galvanisée à haute résistance, ayant une excellente qualité de surface, et son procédé de production
WO2019124781A1 (fr) Tôle d'acier revêtue d'un placage à base de zinc ayant une excellente résistance au vieillissement à température ambiante et une excellente aptitude au durcissement par cuisson, et son procédé de fabrication
WO2021112488A1 (fr) Acier épais à phase composite ayant une excellente durabilité et son procédé de fabrication
WO2016104838A1 (fr) Tôle d'acier laminée à chaud pour tôle d'acier galvanisé haute résistance, présentant une excellente qualité de surface, et son procédé de production
WO2021125901A2 (fr) Tôle d'acier revêtue d'un dépôt d'alliage à base d'aluminium ayant une excellente aptitude au façonnage et une excellente résistance à la corrosion, et son procédé de fabrication
WO2020226301A1 (fr) Feuille d'acier très haute résistance offrant une excellente ouvrabilité de cisaillement et son procédé de fabrication
WO2019124807A1 (fr) Tôle d'acier présentant d'excellentes propriétés de durcissement par cuisson et une excellente résistance à la corrosion et son procédé de fabrication
WO2017111428A1 (fr) Tôle d'acier laminée à froid à haute résistance présentant d'excellentes propriétés de ductilité, de formation de trous et de traitement de surface, tôle d'acier galvanisé dans un bain fondu, et son procédé de fabrication

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: 18810671

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2019565877

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

REG Reference to national code

Ref country code: BR

Ref legal event code: B01A

Ref document number: 112019025146

Country of ref document: BR

ENP Entry into the national phase

Ref document number: 2018810671

Country of ref document: EP

Effective date: 20200102

ENP Entry into the national phase

Ref document number: 112019025146

Country of ref document: BR

Kind code of ref document: A2

Effective date: 20191128