WO2015099399A1 - 내식성 및 용접성이 우수한 열간 프레스 성형용 강판, 성형부재 및 그 제조방법 - Google Patents
내식성 및 용접성이 우수한 열간 프레스 성형용 강판, 성형부재 및 그 제조방법 Download PDFInfo
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- WO2015099399A1 WO2015099399A1 PCT/KR2014/012698 KR2014012698W WO2015099399A1 WO 2015099399 A1 WO2015099399 A1 WO 2015099399A1 KR 2014012698 W KR2014012698 W KR 2014012698W WO 2015099399 A1 WO2015099399 A1 WO 2015099399A1
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- steel sheet
- alloy plating
- magnesium
- plating layer
- hot press
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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
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/12—Aluminium or alloys based thereon
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- 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
- B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
- B21D11/20—Bending sheet metal, not otherwise provided for
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
- C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
-
- 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
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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
- C23C2/50—Controlling or regulating the coating processes
- C23C2/52—Controlling or regulating the coating processes with means for measuring or sensing
- C23C2/522—Temperature of the bath
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12736—Al-base component
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12736—Al-base component
- Y10T428/1275—Next to Group VIII or IB metal-base component
- Y10T428/12757—Fe
Definitions
- the present invention relates to a steel sheet for hot press forming used in automobile parts and the like, and more particularly, to a steel sheet for hot press forming, a molding member, and a manufacturing method thereof having excellent corrosion resistance and weldability.
- HPF hot press forming
- Hot press molding is a method in which a steel sheet is softened at high temperature and processed into a complex shape at high temperature by using a property of high ductility. More specifically, the steel sheet is in an austenite region, that is, a state where phase transition is possible. It is a method which can manufacture the product which has a high-precision precision shape by transforming the structure of a steel plate into martensite by carrying out quenching simultaneously with a process, after heating to.
- Aluminum plated steel sheet has the advantage of not forming a thick oxide film on the plated layer even at high temperatures due to the high melting point of Al and the dense and thin Al oxide layer formed on the plated layer. Due to the excellent effect of protecting the steel sheet from corrosion even in the scratches of the cross-section or surface, such self-sacrificing corrosion resistance is better than galvanized steel sheet than aluminum plated steel sheet. Thus, the improvement of the corrosion resistance of the galvanized steel sheet is superior to that of the aluminum plated steel sheet, and thus the hot press molding (HPF) using the galvanized steel sheet in place of the aluminum plated steel sheet has been proposed.
- HPF hot press molding
- the heating temperature is higher than the melting point of the zinc layer, that is, the zinc plating layer, so that zinc exists in the liquid state for a predetermined time on the surface of the steel sheet.
- the tensile stress is generated on the surface of the steel sheet during processing in the press (pressure), the liquid zinc is wetted into the grain boundary of the base iron.
- zinc soaked at the grain boundary weakens the bonding force of the interface and acts as a site where cracks are generated under tensile stress, and the propagation speed of cracks generated on the surface of the steel sheet is faster and deeper than that of ordinary steel. see.
- alloy plating magnesium Mg
- Alloy plated steel sheet is used for building materials and automotive parts processing because of its excellent corrosion resistance.
- Mg diffuses to the surface of the plating layer during the heating process to form magnesium oxide (MgO) on the surface.
- Silver adhesion is low, there is a problem in that some adhere to the molding die to contaminate the die.
- MgO adhered to the surface of the molded article after molding has a problem of causing a welding failure by acting as a resistance in the process of resistance welding the molded article.
- One aspect of the present invention is to provide a hot press forming steel sheet, a molding member using the same and a method of manufacturing the same, which can supplement the disadvantages of the existing hot pressing steel sheet and at the same time excellent corrosion resistance and weldability.
- the holding steel sheet An aluminum-magnesium alloy plating layer formed on at least one surface of the base steel sheet; And an oxidizing film layer formed on the alloy plating layer, wherein the oxidizing film layer includes a hot press forming member including an element having higher oxidative property than the magnesium (Mg).
- Mg magnesium
- Another aspect of the present invention includes the steps of preparing a holding steel sheet and immersing the holding steel sheet in an aluminum-magnesium alloy plating bath to form an alloy plating layer, the alloy plating bath is 0.5 to 10% by weight of Magnesium (Mg), 0.0005 to 0.05% by weight of the element having a higher oxidative than magnesium (Mg), the remainder Al and other unavoidable impurities are provided a method for producing a steel sheet for hot press forming.
- Mg Magnesium
- Mg Magnesium
- Mg 0.0005 to 0.05% by weight of the element having a higher oxidative than magnesium
- the remainder Al and other unavoidable impurities are provided a method for producing a steel sheet for hot press forming.
- the steel sheet for hot press forming according to the present invention is a steel sheet with improved corrosion resistance compared to the plated steel for hot press forming, and can be used to manufacture a molding member without surface defects during hot press molding, and the molding member is weldable. It is excellent in that it can minimize defects during welding and has the effect of securing welding stability.
- FIG. 1 shows a schematic cross-sectional view of a hot press forming member according to an aspect of the present invention.
- Mg magnesium
- Oxides have a problem that eventually acts as a factor to lower the corrosion resistance and weldability of the plated steel sheet.
- the present inventors have studied in depth the method for suppressing the oxide formation by the Mg at high temperature heating for hot press of the alloy plated steel sheet manufactured therefrom while using Mg alloy plating for the purpose of improving the corrosion resistance of the plated steel sheet.
- Mg is added to the Al-based plating bath and the components having higher oxidation resistance than that of Al and Mg are added, it was confirmed that the alloy plated steel sheet with improved corrosion resistance as well as corrosion resistance can be manufactured and the present invention was completed. .
- the steel sheet for hot press forming includes a base steel sheet and an aluminum-magnesium alloy plating layer formed on at least one surface of the base steel sheet.
- the base steel sheet for the hot press forming steel sheet is sufficient that the steel sheet is applied to a general hot press molding, for example, can be used for ordinary carbon steel.
- a steel sheet containing carbon (C): 0.1 to 0.4% by weight, silicon (Si): 0.05 to 1.5% by weight, manganese (Mn): 0.5 to 3.0% by weight, balance Fe and other unavoidable impurities may be used. But it is not limited thereto.
- the base steel sheet of the present invention is nitrogen (N): 0.001 to 0.02 wt%, boron (B): 0.0001 to 0.01 wt%, titanium for the purpose of further improving mechanical properties such as strength, toughness, weldability, etc.
- Ti 0.001 to 0.1 wt%
- niobium (Nb) 0.001 to 0.1 wt%
- vanadium (V) 0.001 to 0.01 wt%
- chromium (Cr) 0.001 to 1.0 wt%
- molybdenum (Mo) 0.001 to 1.0% by weight
- antimony (Sb) 0.001 to 0.1% by weight
- tungsten (W) may further comprise one or more selected from the group consisting of.
- the steel sheet for hot press forming according to the present invention preferably includes a plating layer on at least one surface of the steel sheet as described above, wherein the plating layer is preferably an aluminum-magnesium alloy plating layer.
- the magnesium content in the alloy plating layer is included in 0.5 to 10% by weight.
- the aluminum-magnesium alloy plating layer may further comprise silicon (Si) 10% by weight or less (excluding 0%), wherein the alloy plating layer is preferably an aluminum-silicon-magnesium alloy plating layer.
- the alloy plating layer preferably has an average thickness of 5 ⁇ 30 ⁇ m, if the average thickness of the alloy plating layer is less than 5 ⁇ m not enough to ensure the corrosion resistance of the plated steel sheet, whereas if it exceeds 30 ⁇ m side to ensure corrosion resistance
- the steel plate manufacturing cost increases with excessively increased plating amount.
- the alloy plating layer contains an element having a higher oxidizing property than the magnesium (Mg) in addition to aluminum, magnesium, and silicon.
- the element having higher oxidizing property than magnesium (Mg) is at least one of beryllium (Be), calcium (Ca), lithium (Li), sodium (Na), strontium (Sr), scandium (Sc), and yttrium (Y). It is preferable that it is more preferably one or more selected from the group consisting of beryllium (Be), calcium (Ca), lithium (Li) and sodium (Na).
- An element having a higher oxidizing property than the magnesium (Mg), such as Be, Ca, Li, Na, etc., is an element having a higher oxidizing property than the aluminum, magnesium, silicon, and the like.
- the oxidizing elements larger than the above-described magnesium (Mg) are first diffused to the surface of the plating layer. Therefore, there is an effect that can prevent the problem of Mg alloy plated steel sheet, that is, corrosion resistance and weldability deterioration due to MgO formation at high temperature heating, for this purpose 0.0005 ⁇ 0.05% by weight of the element having a higher oxidation than magnesium (Mg) It is preferable to include. More advantageously, the element having a higher oxidizing property than the magnesium (Mg) is more preferably contained in 0.0005 to 0.02% by weight.
- the steel sheet for hot press forming includes the steps of preparing a holding steel sheet and immersing the holding steel sheet in an aluminum-magnesium alloy plating bath containing an element having a higher oxidation resistance than magnesium (Mg) to form an alloy plating layer. It can be prepared to include.
- the base steel sheet is preferably the steel species already mentioned in the present invention
- the manufacturing method is not particularly limited, it can be prepared by preparing by a method known in the art.
- an alloy plating layer By immersing the prepared steel sheet in an aluminum-magnesium alloy plating bath, it is preferable to form an alloy plating layer on at least one surface of the steel sheet.
- Forming the alloy plating layer is preferably performed for 2 to 5 seconds in the alloy plating bath of 650 ⁇ 750 °C.
- the temperature of the alloy plating bath is less than 650 °C, there is a problem that the appearance of the plating layer is poor and the plating adhesion is lowered, whereas if the alloy plating bath exceeds 750 °C thermal diffusion of the steel sheet is accelerated to cause abnormal growth of the alloy layer, so workability There is a problem that the degradation and excessive generation of the oxide layer in the plating bath.
- the immersion time is less than 2 seconds is not sufficient plating is not possible to form a plating layer of the desired thickness, whereas if it exceeds 5 seconds is not preferable because there is a problem that the alloy layer grows abnormally.
- the alloy plating bath is 0.5-10% by weight of magnesium (Mg), 0.0005-0.05% by weight, in order to form an alloy plating layer having a target composition in the present invention. It is preferable to include an element having higher oxidative property than the magnesium (Mg) of 5 to 500 ppm, the balance Al and other unavoidable impurities.
- the base steel sheet is eluted in the plating bath so that some components of the base steel plate may exist as impurities in the plating bath. More specifically, 3 wt% or less of Fe and Mg and 0.1 wt% or less of each At least one component of Ni, Cu, Cr, P, S, V, Nb, Ti, and B may be included as impurities in the plating bath.
- one of the elements having higher oxidative properties than magnesium (Mg) is one of beryllium (Be), calcium (Ca), lithium (Li), sodium (Na), strontium (Sr), scandium (Sc), yttrium (Y) It is preferably at least one species, and more preferably at least one species selected from the group consisting of beryllium (Be), calcium (Ca), lithium (Li) and sodium (Na).
- Mg contained in the alloy plating bath is an important element for improving corrosion resistance, particularly when the aluminum-based plated steel sheet is exposed to a corrosive environment, by covering the surface of the plated layer and the exposed portion of the ferrous iron with a corrosion product including Mg. Has the effect of improving the corrosion resistance.
- the content of Mg in the plating bath is less than 0.5% by weight, the content of Mg in the alloy plating layer formed after plating becomes less than 0.5%. In this case, there is a problem in that the corrosion resistance of the molded product is reduced after hot pressing. On the other hand, if the Mg content in the plating bath exceeds 10% by weight there is a problem that the amount of dross generated increases.
- the content of the element having a higher oxidation than magnesium (Mg) is less than 0.0005%, there is a problem that the content of the components in the alloy plating layer formed after plating is less than the minimum content targeted by the present invention, in this case high temperature heating There is a problem in that the effect of suppressing the production of MgO due to the surface diffusion of Mg in the alloy plating layer is greatly reduced, it may eventually cause equipment contamination by MgO dropout during the hot pressing process. In addition, as the Mg content in the alloy plating layer of the final molded article is greatly reduced, there is a problem in that corrosion resistance cannot be secured.
- the elements having higher oxidizing properties than the magnesium (Mg) are partially concentrated at the interface between the plated layer and the base iron, and when heated to a high temperature, the thickener at the interface inhibits the alloying reaction between the base iron and the plated layer.
- alloying with iron is delayed. If the alloying is delayed, there is a problem in that the plating layer is partially dissolved in the process of heating at a high temperature, and there is a problem of being fixed to the die during hot pressing.
- the element having higher oxidizing property than the magnesium (Mg) is more preferably contained in 0.0005 to 0.02% by weight.
- the present invention provides an alloy plated steel sheet formed by adding a small amount of at least one of oxidizing elements higher than magnesium (Mg), such as Be, Ca, Li and Na, in an alloy plating bath containing mainly Mg in addition to Al.
- Mg oxidizing elements higher than magnesium
- elements such as Be, Ca, Li, and Na are excellent in oxidizing properties compared to aluminum and magnesium, and the elements diffuse first to the plating layer surface when heated to a high temperature after completion of plating in the alloy plating bath. Therefore, there is an effect that can suppress the formation of oxides by Mg, as a result has the effect of improving the corrosion resistance of the alloy plated steel sheet.
- the alloy plating layer may further include silicon (Si) of 10% by weight or less (excluding 0%) in addition to the above-described components.
- Si silicon
- the Si has an effect of suppressing excessive diffusion of the base iron during high-temperature heating of the plated steel sheet to suppress the dropping of the plating layer during the hot pressing process, and improves the fluidity of the plating bath.
- the alloy plating layer formed after the plating is completed in the above-described alloy plating bath may be an aluminum-magnesium alloy plating layer or an aluminum-silicon-magnesium alloy plating layer, and each of the alloy plating layers may have higher oxidation resistance than the magnesium (Mg).
- At least one of an element such as beryllium (Be), calcium (Ca), lithium (Li), sodium (Na), strontium (Sr), scandium (Sc), and yttrium (Y) is preferable, and more preferably beryllium At least one selected from the group consisting of (Be), calcium (Ca), lithium (Li), and sodium (Na), preferably 0.0005 to 0.05% by weight, more preferably 0.0005 to 0.02% by weight.
- the hot press forming member of the present invention can be obtained by hot press molding the steel sheet for hot press forming provided in the present invention, more specifically, as shown in FIG.
- the oxidizing coating layer is formed by diffusing components of the aluminum-magnesium alloy plating layer of the hot press forming steel sheet to the surface, and preferably includes an element having higher oxidizing property than the magnesium (Mg), and one of some aluminum and magnesium It includes the above.
- an element having higher oxidation resistance than the magnesium (Mg) may be partially contained in the aluminum-magnesium alloy plating layer.
- magnesium As an element having higher oxidizing property than magnesium (Mg), among (beryllium (Be), calcium (Ca), lithium (Li), sodium (Na), strontium (Sr), scandium (Sc), yttrium (Y)) It is preferable that it is at least one, and more preferably at least one selected from the group consisting of beryllium (Be), calcium (Ca), lithium (Li) and sodium (Na).
- the thickness of the oxidizing film layer comprised as mentioned above is 1 micrometer or less (except 0 micrometer).
- the thickness of the oxidizing film layer exceeds 1 ⁇ m, there is a problem in that weldability is degraded during spot welding.
- the alloy plating layer may further include silicon (Si) in an amount of 10 wt% or less (excluding 0%).
- the alloy plating layer may include some silicon in the oxidizing film layer formed on the alloy plating layer.
- the hot press forming member sequentially comprising an alloy plating layer and an oxidizing coating layer on the surface of the steel sheet heating step for heating the steel sheet for hot press forming of the present invention; Hot press molding; And cooling.
- the heating step is preferably carried out at a temperature increase rate of 3 ⁇ 200 °C / s to Ac3 ⁇ 1000 °C.
- the heating is for austenitizing the microstructure of the steel sheet, and if the temperature is lower than Ac3, there is a problem of abnormality, whereas if the temperature exceeds 1000 ° C, the alloy plating layer may be partially degraded, which is not preferable. .
- the heating up to the temperature range is preferably carried out at a temperature increase rate of 3 ⁇ 200 °C / s, if the temperature increase rate is less than 3 °C / s because it takes a long time to reach the heating temperature 3 °C / It is preferable to carry out more than s, and it is preferable at this time to set the upper limit to 200 degreeC / s in consideration of a heating installation.
- the components contained in the steel sheet and the alloy plating layer diffuse to the surface of the plating layer, and in particular, elements which are more oxidizing than magnesium (Mg) contained in the alloy plating layer, such as Be, Ca, Li, and Na. At least one of the components diffuses first to form an oxidizing coating layer having a thickness of 1 ⁇ m or less (excluding 0 ⁇ m).
- the oxidized film layer may further include some aluminum, magnesium, silicon, or the like, which can be easily diffused onto the surface of the plating layer.
- the present invention may be maintained for a predetermined time at the heating temperature to secure the target material as necessary.
- the holding time is not particularly limited, but considering the diffusion time of the base iron, 240 seconds or less is preferred.
- hot pressing may be performed to produce the molded member.
- hot press molding may use a method generally used in the art, for example, hot pressing the heated steel sheet into a desired shape by using a press while maintaining the heating temperature. It is not limited to this.
- the cooling is advantageous as the speed is faster, and if the cooling rate is less than 20 °C / s, there is a possibility that a low-strength structure such as ferrite or pearlite may be formed, it is not preferable.
- the steel sheet for hot press molding according to the present invention is excellent in corrosion resistance, and can be used to manufacture a molding member without surface defects during hot press molding, and the molding member is excellent in weldability to minimize defects during welding. It is effective to secure welding stability.
- a cold rolled steel sheet for hot press forming having a thickness of 15 mm was prepared as a base steel sheet.
- the steel sheet is the component of C: 0.22wt%, Si: 0.24wt%, Mn: 1.56wt%, P: 0.012wt%, B: 0.0028wt%, Cr: 0.01wt%, Ti: 0.03wt% , Balance Fe and other unavoidable impurities.
- the steel sheet was heated to 800 ° C. for annealing heat treatment, held at the temperature for 50 seconds, cooled, and immersed in a plating bath maintained at 690 ° C. At this time, the composition of the plating bath is as shown in Table 1 below.
- the plating layer was dissolved to analyze the plating adhesion amount and components, and the total thickness of the plating layer was measured by converting it into a thickness. The results are shown in Table 2 below.
- Comparative Example 3 Although Be is contained in the plating bath, the content thereof is very small. As a result, Mg has a slight surface oxidation inhibitory effect during the high temperature heating process for hot pressing, and thus an oxidizing film layer is formed. Corrosion resistance was inferior.
- Comparative Example 5 the plating bath conditions were in accordance with the present invention, but the heating rate for heating the hot press was too slow, and an oxidizing coating layer was formed thick by prolonged heating, which resulted in inferior corrosion resistance.
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Abstract
Description
Claims (15)
- 소지강판 및 상기 소지강판의 적어도 일면에 형성되는 알루미늄-마그네슘 합금 도금층을 포함하고,상기 합금 도금층은 상기 마그네슘(Mg)보다 산화성이 높은 원소를 포함하는 열간 프레스 성형용 강판.
- 제 1항에 있어서,상기 마그네슘(Mg)보다 산화성이 높은 원소는 베릴륨(Be), 칼슘(Ca), 리튬(Li) 및 나트륨(Na)으로 이루어진 그룹에서 선택된 1종 이상인 열간 프레스 성형용 강판.
- 제 1항에 있어서,상기 합금 도금층은 상기 마그네슘(Mg)보다 산화성이 높은 원소를 0.0005~0.05중량%로 포함하는 열간 프레스 성형용 강판.
- 제 3항에 있어서,상기 합금 도금층은 상기 마그네슘(Mg)보다 산화성이 높은 원소를 0.0005~0.02중량%로 포함하는 열간 프레스 성형용 강판.
- 제 1항에 있어서,상기 합금 도금층은 마그네슘(Mg)을 0.5~10중량%로 포함하는 열간 프레스 성형용 강판.
- 제 1항에 있어서,상기 합금 도금층은 실리콘(Si)을 10중량% 이하(0%는 제외)로 더 포함하고, 상기 합금 도금층은 알루미늄-실리콘-마그네슘 합금 도금층인 열간 프레스 성형용 강판.
- 제 1항에 있어서,상기 합금 도금층은 5~30㎛의 평균 두께를 갖는 것인 열간 프레스 성형용 강판.
- 소지강판;상기 소지강판의 적어도 일면에 형성되는 알루미늄-마그네슘 합금 도금층; 및상기 합금 도금층 상부에 형성되는 산화성 피막층을 포함하고,상기 산화성 피막층은 상기 마그네슘(Mg)보다 산화성이 높은 원소를 포함하는 열간 프레스 성형부재.
- 제 8항에 있어서,상기 마그네슘(Mg) 보다 산화성이 높은 원소는 베릴륨(Be), 칼슘(Ca), 리튬(Li) 및 나트륨(Na)으로 이루어진 그룹에서 선택된 1종 이상인 열간 프레스 성형부재.
- 제 8항에 있어서,상기 산화성 피막층은 알루미늄 및 마그네슘 중 1종 이상을 더 포함하는 열간 프레스 성형부재.
- 제 8항에 있어서,합금 도금층은 실리콘(Si)을 10중량% 이하(0%는 제외)로 더 포함하고, 상기 합금 도금층은 알루미늄-실리콘-마그네슘 합금 도금층인 열간 프레스 성형부재.
- 제 8항에 있어서,상기 합금 도금층의 평균 두께는 5~35㎛이고, 상기 산화성 피막층의 평균 두께는 1㎛ 이하(0㎛ 제외)인 열간 프레스 성형부재.
- 소지강판을 준비하는 단계 및 상기 소지강판을 알루미늄-마그네슘 합금 도금욕에 침지하여 합금 도금층을 형성하는 단계를 포함하고,상기 합금 도금욕은 0.5~10중량%의 마그네슘(Mg), 0.0005~0.05중량%의 상기 마그네슘(Mg)보다 산화성이 높은 원소, 잔부 Al 및 기타 불가피한 불순물을 포함하는 것인 열간 프레스 성형용 강판의 제조방법.
- 제 13항에 있어서,상기 마그네슘(Mg)보다 산화성이 높은 원소는 베릴륨(Be), 칼슘(Ca), 리튬(Li) 및 나트륨(Na)으로 이루어지는 그룹에서 선택된 1종 이상인 열간 프레스 성형용 강판의 제조방법.
- 제 13항에 있어서,상기 합금 도금욕은 10중량% 이하의 실리콘(Si)을 더 포함하는 열간 프레스 성형용 강판의 제조방법.
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