WO2021039499A1 - 低強度ホットスタンプ用鋼板、ホットスタンプ部品およびホットスタンプ部品の製造方法 - Google Patents
低強度ホットスタンプ用鋼板、ホットスタンプ部品およびホットスタンプ部品の製造方法 Download PDFInfo
- Publication number
- WO2021039499A1 WO2021039499A1 PCT/JP2020/031118 JP2020031118W WO2021039499A1 WO 2021039499 A1 WO2021039499 A1 WO 2021039499A1 JP 2020031118 W JP2020031118 W JP 2020031118W WO 2021039499 A1 WO2021039499 A1 WO 2021039499A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- steel sheet
- hot stamping
- less
- hot
- low
- Prior art date
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/02—Hardening articles or materials formed by forging or rolling, with no further heating beyond that required for the formation
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/673—Quenching devices for die quenching
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0242—Flattening; Dressing; Flexing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
- B21D22/022—Stamping using rigid devices or tools by heating the blank or stamping associated with heat treatment
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2251/00—Treating composite or clad material
- C21D2251/02—Clad material
Definitions
- the present invention relates to a low-strength hot-stamping steel plate, a hot-stamping part using a low-strength hot-stamping steel plate, and a method for manufacturing the hot-stamping part.
- a low-strength hot stamping steel plate having a high yield ratio YR (Yield Ratio) expressed by the ratio of yield stress YS (Yield Stress) and tensile strength TS (YS / TS) and excellent safety at the time of collision, such as
- the present invention relates to a hot stamping part using a low-strength hot stamping steel plate, and a method for manufacturing the hot stamping part.
- collision safety From the viewpoint of reducing the weight of automobiles and ensuring safety in the event of a collision (hereinafter referred to as "collision safety"), a steel plate having high strength and a high yield ratio YR is required. Further, since the press formability in the cold is deteriorated due to the increase in the strength of the steel sheet, a hot stamping technique has been proposed in which the steel sheet is press-formed in a heated state to simultaneously realize the formability and the increase in strength.
- the tensile strength TS is mainly 1.5 GPa class or higher.
- steel parts having a tensile strength TS of 500 MPa or more as shown in Patent Document 1 high-strength members having a tensile strength TS of 600 to 1000 MPa as shown in Patent Document 2, and Patent Document 3 show.
- the structure is controlled by the hot stamping process and the tensile strength TS is controlled.
- the tensile strength TS of hot stamping parts is largely dependent on the hot stamping process. It is conceivable to control the tensile strength TS of the steel sheet to be increased by adding alloying elements so as not to depend on the hot stamping process, but for that purpose, it is necessary to add a large amount of various alloying elements. is there.
- the present invention has been made in view of the above circumstances, and an object thereof is to make a hot stamping component having a yield ratio YR of 70% or more and a tensile strength TS of 500 to 800 MPa, which is less dependent on the hot stamping process. It is an object of the present invention to provide a low-strength hot stamping steel plate that can be manufactured without any effort, a hot stamping part using such a low-strength hot stamping steel plate, and a method for manufacturing the hot stamping part.
- the present inventors have diligently studied from the viewpoint of realizing a low-strength hot stamping steel sheet capable of manufacturing hot stamping parts without much dependence on the hot stamping process.
- the Ac 3 point (° C) of the steel sheet is raised, the elements that improve the hardenability are reduced, and the steel sheet having a structure mainly composed of ferrite is hot.
- the austenite fraction was reduced during heat treatment of stamps and the like, and the following actions (1) and (2) were exhibited, and further studies were carried out based on such findings to complete the present invention.
- the yield ratio YR can be improved by making it difficult for a martensite structure to be formed in the structure after heat treatment.
- the steel plate is by mass% C: 0.005 to 0.12%, Si: 0.50 to 2.0%, Mn: 0.50% or less (not including 0%), Al: 0.010-1.0%, P: 0.1000% or less (not including 0%), S: 0.0100% or less (not including 0%), N: 0.0100% or less (not including 0%), and O: 0.0100% or less (not including 0%),
- the balance is iron and unavoidable impurities, Low strength characterized in that the Ac 3 points (° C.) represented by the following formula (1) are 890 ° C. or higher, and the area ratio of ferrite at a depth of 1/4 of the steel sheet thickness is 80% or higher. It is a steel plate for hot stamping.
- FIG. 1 is a schematic diagram showing a heat treatment pattern assuming a hot stamping process.
- FIG. 2 is a graph showing the relationship between the tensile strength TS and the yield stress YS after the heat treatment.
- the inventors examined from various angles in order to achieve the above object. As a result, it was found that the above purpose can be achieved brilliantly if the chemical composition is appropriately adjusted to raise the Ac 3 point (° C.) of the steel sheet to obtain a steel sheet having a structure mainly composed of ferrite. Completed the invention.
- a low-strength hot stamping steel sheet capable of manufacturing a hot stamping component having a yield ratio YR of 70% or more and a tensile strength TS of 500 to 800 MPa without much dependence on the hot stamping process.
- the low-strength hot stamping steel sheet of the present embodiment has C: 0.005 to 0.12%, Si: 0.50 to 2.0%, Mn: 0.50% or less (not including 0%), Al. : 0.010 to 1.0%, P: 0.1000% or less (not including 0%), S: 0.0100% or less (not including 0%), N: 0.0100% or less (0%) (Does not include), and O: 0.0100% or less (does not include 0%) is satisfied.
- C is an element that secures the strength of the steel sheet. Further, C is an element that facilitates the formation of martensite in the structure after heat treatment by lowering the Ac 3 points and increases the strength of the hot stamped parts. If the amount of C is excessive, the yield ratio YR of the hot stamping component will be lowered, so the upper limit must be 0.12% or less.
- the amount of C is preferably 0.10% or less, more preferably 0.08% or less. On the other hand, excessively reducing the amount of C leads to an increase in manufacturing cost, so the amount is set to 0.005% or more.
- the amount of C is preferably 0.007% or more, more preferably 0.010% or more.
- Si is an important element for raising the Ac 3 point, reducing the austenite fraction during heat treatment, and reducing the process dependence of hot stamping in hot stamping parts. Further, Si is an element that contributes to ensuring the strength of hot stamping parts by strengthening the solid solution of ferrite.
- the amount of Si is 0.50% or more.
- the amount of Si is preferably 0.70% or more, more preferably 1.0% or more.
- the amount of Si is set to 2.0% or less.
- the amount of Si is preferably 1.8% or less, more preferably 1.6% or less.
- Mn 0.50% or less (not including 0%)
- Mn is an inconvenient element in the present invention because it lowers the Ac 3 point.
- Mn is an element that increases the austenite fraction during heat treatment and enhances the process dependence of hot stamping in hot stamping parts. Further, Mn enhances hardenability, facilitates the formation of martensite in the structure of hot stamped parts, and lowers the yield ratio YR of hot stamped parts. Therefore, the amount of Mn is set to 0.50% or less.
- the amount of Mn is preferably 0.40% or less, more preferably 0.30% or less.
- excessively reducing the amount of Mn leads to an increase in manufacturing cost, so the amount is set to more than 0%.
- the lower limit of the amount of Mn is preferably 0.005% or more, and more preferably 0.01% or more.
- Al 0.010 to 1.0%
- Al is an element that acts as an antacid.
- Al is an element that raises the Ac 3 point like Si, reduces the austenite fraction during heat treatment, and reduces the process dependence of hot stamping in hot stamping parts.
- Al is an element that dissolves in ferrite and contributes to ensuring the strength of hot stamping parts by strengthening the solid solution of ferrite.
- the amount of Al is 0.010% or more.
- the amount of Al is preferably 0.020% or more, more preferably 0.025% or more.
- the amount of Al is set to 1.0% or less.
- the amount of Al is preferably 0.80% or less, more preferably 0.70% or less.
- P 0.1000% or less (excluding 0%)
- P is an element that is inevitably contained and deteriorates the weldability of the steel sheet. Further, P is also an element having an effect of contributing to the solid solution strengthening of the ferrite phase. In order not to deteriorate the weldability of the steel sheet while exerting such an effect, the P amount is set to 0.1000% or less.
- the amount of P is preferably 0.0500% or less, and more preferably 0.0200% or less. Note that P is an impurity that is inevitably mixed in steel, and it is impossible to reduce the amount to 0% in industrial production, and it is usually contained in an amount of 0.0005% or more.
- S 0.0100% or less (not including 0%)
- S is an element that is inevitably contained and deteriorates the weldability of the steel sheet. Therefore, the amount of S is set to 0.0100% or less.
- the amount of S is preferably 0.0080% or less, and more preferably 0.0050% or less. Since the amount of S should be as small as possible, the lower limit is not particularly limited. However, it is impossible to make the amount 0% in industrial production, and it is usually contained in 0.0001% or more.
- N 0.0100% or less (not including 0%)
- N is an element that is inevitably contained, and if it is contained in an excessive amount, AlN is generated and the effect of solid solution Al is reduced. Therefore, the amount of N is set to 0.0100% or less.
- the amount of N is preferably 0.0080% or less, more preferably 0.0050% or less. Since the amount of N should be as small as possible, the lower limit is not particularly limited. However, it is impossible to make the amount 0% in industrial production, and it is usually contained in 0.0001% or more.
- O 0.0100% or less (not including 0%)
- O is an element that is inevitably contained, and if it is contained in an excessive amount, it forms an oxide, lowers the solid solution Si, and causes a decrease in the strength of ferrite. Therefore, the amount of O is set to 0.0100% or less.
- the amount of O is preferably 0.0050% or less, more preferably 0.0030% or less. Since the amount of O should be as small as possible, the lower limit is not particularly limited. However, it is impossible to make the amount 0% in industrial production, and it is usually contained in 0.0001% or more.
- the basic components of the low-strength hot stamping steel sheet of this embodiment are as described above, and the balance is iron and unavoidable impurities other than the above P, S, N, and O.
- this unavoidable impurity mixing of playing card elements (Pb, Bi, Sb, Sn, etc.) brought in depending on the conditions of raw materials, materials, manufacturing equipment, etc. is permitted as long as the effects of the present invention are not impaired.
- the low-strength hot stamping steel sheet of the present embodiment can contain at least one of Ti and Nb as other elements, and the characteristics of the steel sheet are further improved by containing these elements.
- Ti and Nb are carbide-forming elements and are elements that contribute to the microstructure of the steel sheet.
- the structure of the steel sheet finer, reverse transformation during heat treatment is promoted, but ferrite formation can be promoted during cooling in the hot stamping process, and the ferrite fraction of the hot stamping component can be increased.
- the content is 0.10% or less. It is preferably 0.07% or less, and more preferably 0.05% or less.
- any one of Ti and Nb may be contained, or both of them may be contained. Further, the above effect is exhibited even in a small amount, and the lower limit of the content of Ti and Nb is not limited, but in order to exert the above effect more effectively, it is preferably contained in an amount of 0.005% or more. ..
- the low-strength hot stamping steel sheet of the present embodiment has an Ac 3 point (° C.) represented by the following formula (1) of 890 ° C. or higher.
- Ac 3 points (° C.) 910-203 x [C] 1/2 + 44.7 x [Si] -30 x [Mn] + 700 x [P] + 400 x [Al] + 400 x [Ti] ... (1) )
- [C], [Si], [Mn], [P], [Al], and [Ti] each have a mass% of the content of C, Si, Mn, P, Al, and Ti. It is a value represented by.
- the above formula (1) is a simplified formula of the following formula (2) in consideration of the types of elements contained. That is, in the low-strength hot stamping steel sheet of the present embodiment, Ac 3 points (° C.) are increased, attention is paid to Si and Al, which are less likely to deteriorate other characteristics, and Ac 3 points (° C.) are decreased. , Mn, etc. are reduced.
- [C], [Ni], [Si], [V], [Mo], [W], [Mn], [Cr], [Cu], [P], [Al] And [Ti] are values expressing the contents of C, Ni, Si, V, Mo, W, Mn, Cr, Cu, P, Al, As and Ti in% by mass, respectively.
- the area ratio of ferrite at a depth of 1/4 of the steel sheet thickness needs to be 80% or more.
- the measurement point of the area ratio of ferrite is set to the depth of 1/4 of the thickness of the steel sheet because it is the place showing the most typical characteristics of the steel sheet.
- the area ratio of ferrite is a value measured by the point calculation method.
- This point calculation method is applied when calculating the area percentage of the mixed structure and the ferrite crystal grains when a structure other than ferrite is mixed, and is a method applied when the surface to be inspected (steel plate thickness). This is a method of counting the number of grid point centers occupied by ferrite crystal grains by taking a picture with a surface exposed to a depth of 1/4), placing a specified grid line on the shot photograph. In the examples described later, the procedure was performed under the condition that the number of squares (squares) partitioned by grid lines was 100.
- an optical microscope or a scanning microscope was used depending on the size of the ferrite crystal grains (magnification: in the range of 400 to 1000), but the measured values did not change. ..
- C-containing structures such as pearlite, bainite, and martensite that preferentially reverse transform to austenite by appropriately controlling the design of the chemical composition as described above and increasing the ferrite area ratio of the steel sheet.
- the rate can be reduced.
- the reverse transformation to austenite can be delayed and the austenite fraction during the heat treatment can be reduced, and the yield stress can be reduced without extremely increasing the tensile strength TS of the steel sheet after the heat treatment.
- YS can be secured and the yield YR ratio can be increased.
- the area ratio of ferrite in the low-strength hot stamping steel sheet of the present embodiment needs to be 80% or more.
- the area ratio of ferrite is preferably 84% or more, more preferably 86% or more. Alternatively, it may be 100%.
- the structure of the low-strength hot stamping steel sheet of the present embodiment may have a ferrite area ratio of 80% or more, and may contain a small amount of the above-mentioned pearlite, bainite, martensite, etc. as other structures. good. Alternatively, it may contain retained austenite.
- B has an action of suppressing the formation and growth of polygonal ferrite from the austenite grain boundary, and as a result, acts to reduce the area ratio of ferrite. It is preferable not to contain an element such as B that reduces the ferrite area ratio as much as possible. However, it is acceptable as long as it does not have the above-mentioned adverse effects, for example, up to 0.0005%.
- the low-strength hot stamping steel sheet of the present embodiment is not only a hot-rolled steel sheet and a cold-rolled steel sheet, but also a hot-dip galvanized layer (GI: Hot Dip-Galvanized) or alloying and melting on these hot-rolled steel sheets and cold-rolled steel sheets.
- GI Hot Dip-Galvanized
- a galvanized layer (GA: Alloyed Hot Dip-Galvanized) may be provided, and a hot-dip galvanized steel sheet (GI steel sheet) and an alloyed hot-dip galvanized steel sheet (GA steel sheet) are also included in the present invention.
- the low-strength hot stamping steel sheet of the present embodiment is The weight of the steel plate is C: 0.005 to 0.12%, Si: 0.50 to 2.0%, Mn: 0.50% or less (excluding 0%), Al: 0.010 to 1.0%, P: 0.1000% or less (excluding 0%), S: 0.0100% or less (excluding 0%), N: 0.0100% or less (excluding 0%), And O: 0.0100% or less (not including 0%), the balance is iron and unavoidable impurities, the Ac 3 point (° C.) represented by the above formula (1) is 890 ° C. or higher, and The area ratio of ferrite at a depth of 1/4 of the thickness of the steel plate is 80% or more.
- a low-strength hot stamping steel sheet capable of manufacturing a hot stamping component having a yield ratio of 70% or more and a tensile strength of 500 to 800 MPa without much dependence on the hot stamping process. Can be realized.
- the low-strength hot stamping steel sheet of the present embodiment further contains at least one of Ti: 0.10% or less (not including 0%) and Nb: 0.10% or less (not including 0%).
- Ti 0.10% or less (not including 0%)
- Nb 0.10% or less (not including 0%).
- the properties of the steel sheet are further improved depending on the components contained.
- the low-strength hot stamping steel sheet of the present embodiment is useful as a steel sheet having a tensile strength of 1000 MPa or more after heat treatment and a steel sheet for manufacturing tailored blank parts.
- the heating temperature before press forming is set to the single-phase temperature of austenite (ie, higher than Ac 3 points). Then, the steel sheet heated to the temperature range is press-formed while being cooled by the mold to be a hot-pressed part.
- the Ac 3 points of the steel sheet are usually set to a temperature lower than 860 ° C. Therefore, the steel sheet having a tensile strength of 1000 MPa or more after heat treatment and the steel sheet for low-strength hot stamping of the present embodiment are tailored blanked by welding or the like, and then Ac 3 of the steel sheet for low-strength hot stamping at 860 ° C. or higher. If hot stamping is performed after heating to a temperature range below the point, a tailored blank material having a region of tensile strength of 1000 MPa or more and a region of 500 to 800 MPa can be obtained.
- the heating temperature range is an austenite region in a steel sheet having a tensile strength of 1000 MPa or more after heat treatment, and martensite and bainite are generated during subsequent cooling to obtain high strength. Further, in the low-strength hot stamping steel plate of the present embodiment, the heating temperature range is a two-phase region of austenite and ferrite, and the formation of martensite and bainite is suppressed during subsequent cooling, resulting in a structure mainly composed of ferrite. It becomes low strength.
- the heating temperature before press molding is set to the single-phase temperature of austenite, specifically in the temperature range of 900 ⁇ 50 ° C., but in the present invention, it is 900 ⁇ 50 ° C.
- the heating temperature range at the time of hot stamping may be appropriately set according to the three Ac points of each steel sheet to be tailored blank.
- the low-strength hot stamping steel sheet of the present embodiment is not limited to the tailored blank material, but is desired by including heating to the above Ac 3 points (° C.) or less and hot stamping. It is possible to manufacture hot stamping parts that exhibit the characteristics of. That is, the hot stamping component using the low-strength hot stamping steel sheet of the present embodiment is a hot stamping component having a characteristic that the yield ratio is 70% or more and the tensile strength is 500 to 800 MPa.
- the steel sheet thickness of the hot-rolled steel sheet of No. 8 is the thickness after the surface is ground by 0.2 mm and the scale is reduced.
- the area ratio of ferrite (hereinafter referred to as "ferrite fraction") is measured by the above-mentioned point calculation method, and heat treatment is performed assuming a hot stamping process, and the tensile properties of the steel sheet after the heat treatment are applied.
- the heat treatment conditions at this time were performed by a heat treatment simulator based on the following References 1 and 2.
- FIG. 1 schematically shows a heat treatment pattern assuming a hot stamping process.
- Reference 1 Pre-printed collection of the Academic Lecture Meeting of the Society of Automotive Engineers of Japan, No. 72-07, p. 14
- Reference 2 Metal Forming, steel research int. 79 (2008), No. 2, p. 81
- the steel plate was heated to 890 ° C. at a heating rate of 10 ° C./sec, held at that temperature for 300 seconds, and then cooled to 750 ° C. at a cooling rate of 20 ° C./sec. After that, it is shown that the product was cooled to 450 ° C. at a cooling rate of 40 ° C./sec and further cooled to room temperature (25 ° C.) at a cooling rate of about 5 ° C./sec.
- the tensile strength TS and the yield stress YS were determined by taking a JIS No. 5 test piece (plate-shaped test piece) and performing a tensile test in accordance with JIS Z 2241: 2011. At this time, regarding the yield stress YS, if a clear yield point appears, the upper yield point UYP (Upper Yield Point) is measured, and if the yield point does not appear, 0.2% based on the above JIS provisions. The yield strength ⁇ 0.2 was calculated. The acceptance criteria were that the tensile strength TS was in the range of 500 to 800 MPa and the yield ratio YR was 70% or more.
- Experiment No. 5 to 8 are comparative examples that do not satisfy any of the requirements specified in the present invention, and desired characteristics have not been obtained.
- Reference numeral 5 denotes an example using a steel type E in which the amount of Mn is excessive (the amount of B is also excessive), the Ac 3 transformation point (° C.) is lower than 890 ° C., the steel sheet has a low ferrite fraction, and is after heat treatment. The yield ratio YR of the steel sheet is less than 70%.
- Reference numeral 6 denotes an example in which the steel type F having a small amount of Si and an excessive amount of Mn (the amount of B is also excessive) is used, and is a steel sheet having an Ac 3 transformation point (° C.) lower than 890 ° C. and a low ferrite fraction. Yes, the yield ratio YR of the steel sheet after heat treatment is less than 70%.
- Experiment No. 7 is an example applied to a GA steel sheet, but a steel type G having a small amount of Si and an excessive amount of Mn is used, the Ac 3 transformation point (° C.) is lower than 890 ° C., and the ferrite fraction is low. It is a steel sheet, and the yield ratio YR of the steel sheet after heat treatment is less than 70%.
- Reference numeral 8 denotes an example applied to a hot-rolled steel sheet, in which steel type H having a small amount of Si and an excessive amount of Mn is used, the Ac 3 transformation point (° C.) is lower than 890 ° C., and the ferrite fraction is high. It is a low steel sheet, and the yield ratio YR of the steel sheet after heat treatment is less than 70%.
- Fig. 2 shows the relationship between the tensile strength TS and the yield stress YS after heat treatment.
- the line L indicates a boundary line in which the yield ratio YR is 70%
- the upper region including the line L indicates that the yield ratio YR is 70% or more
- the region below the line L is It shows that the yield ratio YR is less than 70%.
- "Experiment No.” is abbreviated as "No.”.
- the hot stamped parts (steel plates after heat treatment) having a yield ratio of 70% or more and a tensile strength TS of 500 to 800 MPa are hot stamped. It can be seen that it can be manufactured without much dependence on the process.
- the present invention has a wide range of industrial applicability in the technical field related to hot stamping steel sheets and hot stamping parts.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Articles (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
(1)ホットスタンプのプロセス中の組織変化を極力低減させることで、プロセスにあまり依存せず所定の強度が得られること、
(2)熱処理後の組織にマルテンサイト組織を生じ難くすることで、降伏比YRを向上し得ること。
鋼板が、質量%で、
C:0.005~0.12%、
Si:0.50~2.0%、
Mn:0.50%以下(0%を含まない)、
Al:0.010~1.0%、
P:0.1000%以下(0%を含まない)、
S:0.0100%以下(0%を含まない)、
N:0.0100%以下(0%を含まない)、および
O:0.0100%以下(0%を含まない)、
を満たし、残部が鉄および不可避不純物であり、
下記式(1)で示されるAc3点(℃)が890℃以上であり、且つ鋼板厚さの1/4の深さにおけるフェライトの面積率が80%以上であることを特徴とする低強度ホットスタンプ用鋼板である。
上記式(1)中、[C]、[Si]、[Mn]、[P]、[Al]、[Ti]は、それぞれC、Si、Mn、P、Al、Tiの含有率を質量%で表した値である。
Cは、鋼板の強度を確保する元素である。また、Cは、Ac3点を低下させることで熱処理後の組織にマルテンサイトを生成しやすくし、ホットスタンプ部品の強度を上昇させる元素である。このようなC量が過剰になると、ホットスタンプ部品の降伏比YRの低下を招くことから、その上限は0.12%以下とする必要がある。C量は、好ましくは0.10%以下であり、より好ましくは0.08%以下である。一方、C量を過度に低減することは、製造上のコストアップに繋がることになるので、0.005%以上とする。C量は、好ましくは0.007%以上であり、より好ましくは0.010%以上である。
Siは、Ac3点を上昇させ、熱処理時のオーステナイト分率を低減させ、ホットスタンプ部品におけるホットスタンプのプロセス依存性を低下させる上で重要な元素である。また、Siは、フェライトの固溶強化によりホットスタンプ部品の強度確保に寄与する元素である。こうした効果を発揮させるために、Si量は0.50%以上とする。Si量は、好ましくは0.70%以上、より好ましくは1.0%以上である。しかしながら、Si量が過剰になると、鋼板製造時の酸洗性の劣化や、めっき性の悪化を引き起こす。したがって、Si量は、2.0%以下とする。Si量は、好ましくは1.8%以下であり、より好ましくは1.6%以下である。
Mnは、Ac3点を低下させることから、本発明において不都合な元素である。また、Mnは、熱処理時のオーステナイト分率を上昇させ、ホットスタンプ部品におけるホットスタンプのプロセス依存性を高める元素である。更に、Mnは、焼入れ性を高め、ホットスタンプ部品の組織にマルテンサイトを生成しやすくし、ホットスタンプ部品の降伏比YRを低下させる。そのため、Mn量は、0.50%以下とする。Mn量は、好ましくは0.40%以下であり、より好ましくは0.30%以下である。一方、Mn量を過度に低減することは、製造上のコストアップに繋がることになるので、0%超とする。Mn量の下限は、好ましくは0.005%以上であり、より好ましくは0.01%以上である。
Alは、脱酸剤として作用する元素である。またAlは、Siと同様にAc3点を上昇させ、熱処理時のオーステナイト分率を低減させ、ホットスタンプ部品におけるホットスタンプのプロセス依存性を低減させる元素である。また、Alはフェライトに固溶し、フェライトの固溶強化によりホットスタンプ部品の強度確保に寄与する元素である。こうした効果を発揮させるために、Al量は、0.010%以上とする。Al量は、好ましくは0.020%以上、より好ましくは0.025%以上である。しかしながら、Alを過剰に含有させることは、製造上のコストアップに繋がることになるので、Al量は1.0%以下とする。Al量は、好ましくは0.80%以下であり、より好ましくは0.70%以下である。
Pは、不可避的に含有する元素であり、鋼板の溶接性を劣化させる元素である。また、Pは、フェライト相の固溶強化に寄与する効果を有する元素でもある。このような効果を発揮させつつ鋼板の溶接性を劣化させないためには、P量は0.1000%以下とする。P量は、好ましくは0.0500%以下であり、より好ましくは0.0200%以下である。なお、Pは鋼中に不可避的に混入してくる不純物であり、その量を0%にすることは工業生産上不可能であり、通常0.0005%以上で含有する。
Sは、不可避的に含有する元素であり、鋼板の溶接性を劣化させる。したがって、S量は0.0100%以下とする。S量は、好ましくは0.0080%以下であり、より好ましくは0.0050%以下である。S量は、できるだけ少ない方が良いため、下限は特に限定されない。しかし、その量を0%にすることは工業生産上不可能であり、通常0.0001%以上で含有する。
Nは、不可避的に含有する元素であり、過剰に含まれるとAlNを生成させ、固溶Alの効果を低減させる。したがって、N量は0.0100%以下とする。N量は、好ましくは0.0080%以下であり、より好ましくは0.0050%以下である。N量は、できるだけ少ない方が良いため、下限は特に限定されない。しかし、その量を0%にすることは工業生産上不可能であり、通常0.0001%以上で含有する。
Oは、不可避的に含有する元素であり、過剰に含まれると酸化物を形成し、固溶Siを低下させてフェライトの強度低下を生じさせる。そのため、O量は0.0100%以下とする。O量は、好ましくは0.0050%以下であり、より好ましくは0.0030%以下である。O量は、できるだけ少ない方が良いため、下限は特に限定されない。しかし、その量を0%にすることは工業生産上不可能であり、通常0.0001%以上で含有する。
TiおよびNbは、炭化物形成元素であり、鋼板の組織微細化に寄与する元素である。鋼板の組織が微細化することで、熱処理時の逆変態は促進されるものの、ホットスタンプのプロセスでの冷却中にフェライト生成を促進し、ホットスタンプ部品のフェライト分率を高めることができる。このような効果は、TiおよびNbの含有量が増加するにつれて大きくなるが、過剰に含有しても冷間圧延性が悪化するという不都合が生じる。こうした観点から、いずれも0.10%以下で含有させる。好ましくは、0.07%以下であり、より好ましくは0.05%以下である。TiおよびNbはいずれか1種を含有してもよいし、2種とも含有させてもよい。また、上記効果は微量であっても発揮され、TiおよびNbの含有量の下限については限定されないが、上記効果をより有効に発揮させるためには、0.005%以上で含有させることが好ましい。
Ac3点(℃)=910-203×[C]1/2+44.7×[Si]-30×[Mn]+700×[P]+400×[Al]+400×[Ti]・・・(1)
上記式(1)中、[C]、[Si]、[Mn]、[P]、[Al]、[Ti]は、それぞれC、Si、Mn、P、Al、Tiの含有率を質量%で表した値である。
Ac3点(℃)=910-203×[C]1/2-15.2×[Ni]+44.7×[Si]+104×[V]+31.5×[Mo]+13.1×[W]-[30×[Mn]+11×[Cr]+20×[Cu]-700×[P]-400×[Al]-120×[As]-400×[Ti]]・・・(2)
上記式(2)中、[C]、[Ni]、[Si]、[V]、[Mo]、[W]、[Mn]、[Cr]、[Cu]、[P]、[Al]および[Ti]は、それぞれC、Ni、Si、V、Mo、W、Mn、Cr、Cu、P、Al、AsおよびTiの含有率を質量%で表した値である。
鋼板が、質量%で、C:0.005~0.12%、Si:0.50~2.0%、Mn:0.50%以下(0%を含まない)、Al:0.010~1.0%、P:0.1000%以下(0%を含まない)、S:0.0100%以下(0%を含まない)、N:0.0100%以下(0%を含まない)、およびO:0.0100%以下(0%を含まない)、を満たし、残部が鉄および不可避不純物であり、前記式(1)で示されるAc3点(℃)が890℃以上であり、且つ鋼板厚さの1/4の深さにおけるフェライトの面積率が80%以上である。
参考文献1:社団法人自動車技術会学術講演会前刷集、No.72-07、p.14
参考文献2:Metal Forming,steel reserch int.79(2008),No.2,p.81
引張強度TSおよび降伏応力YSは、JIS5号試験片(板状試験片)を採取し、JIS Z 2241:2011に従って引張試験を実施して求めた。このとき降伏応力YSについては、明確な降伏点が現れる場合には、上降伏点UYP(Upper Yield Point)を測定し、降伏点が現れない場合には、上記JISの規定に基づき0.2%耐力σ0.2を求めた。合格基準は、引張強度TSが500~800MPaの範囲にあり、降伏比YRが70%以上を合格とした。
Claims (5)
- 鋼板が、質量%で、
C:0.005~0.12%、
Si:0.50~2.0%、
Mn:0.50%以下(0%を含まない)、
Al:0.010~1.0%、
P:0.1000%以下(0%を含まない)、
S:0.0100%以下(0%を含まない)、
N:0.0100%以下(0%を含まない)、および
O:0.0100%以下(0%を含まない)、
を満たし、残部が鉄および不可避不純物であり、
下記式(1)で示されるAc3点(℃)が890℃以上であり、且つ鋼板厚さの1/4の深さにおけるフェライトの面積率が80%以上であることを特徴とする低強度ホットスタンプ用鋼板。
Ac3点(℃)=910-203×[C]1/2+44.7×[Si]-30×[Mn]+700×[P]+400×[Al]+400×[Ti]・・・(1)
上記式(1)中、[C]、[Si]、[Mn]、[P]、[Al]、[Ti]は、それぞれC、Si、Mn、P、Al、Tiの含有率を質量%で表した値である。 - 前記鋼板は、更に、Ti:0.10%以下(0%を含まない)およびNb:0.10%以下(0%を含まない)の少なくとも1種を含む請求項1に記載の低強度ホットスタンプ用鋼板。
- 熱処理後の引張強度が1000MPa以上となる鋼板と、テーラドブランク部品を製造するための請求項1または2に記載の低強度ホットスタンプ用鋼板。
- 請求項1~3のいずれかに記載の低強度ホットスタンプ用鋼板を、前記Ac3点(℃)以下に加熱し、ホットスタンプすることを含むホットスタンプ部品の製造方法。
- 請求項1~3のいずれかに記載の低強度ホットスタンプ用鋼板を用いたホットスタンプ部品。
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202080058196.3A CN114258434B (zh) | 2019-08-27 | 2020-08-18 | 热冲压用低强度钢板、热冲压部件以及热冲压部件的制造方法 |
CA3150774A CA3150774A1 (en) | 2019-08-27 | 2020-08-18 | Low-strength steel sheet for hot stamping, hot-stamped component, and method for manufacturing hot-stamped component |
BR112022003304A BR112022003304A2 (pt) | 2019-08-27 | 2020-08-18 | Chapa de aço de baixa resistência para estampagem a quente, componente estampado a quente e método para fabricação de componente estampado a quente |
EP20856767.7A EP3998359A4 (en) | 2019-08-27 | 2020-08-18 | LOW STRENGTH STEEL SHEET FOR HOT STAMPING, HOT STAMPED COMPONENT AND METHOD OF MAKING HOT STAMPED COMPONENT |
KR1020227006022A KR20220035961A (ko) | 2019-08-27 | 2020-08-18 | 저강도 핫 스탬핑용 강판, 핫 스탬핑 부품 및 핫 스탬핑 부품의 제조 방법 |
US17/636,803 US20220298592A1 (en) | 2019-08-27 | 2020-08-18 | Low-strength steel sheet for hot stamping, hot-stamped component, and method for manufacturing hot-stamped component |
MX2022002260A MX2022002260A (es) | 2019-08-27 | 2020-08-18 | Lamina de acero de baja resistencia para estampado en caliente, componente estampado en caliente y metodo para fabricar componente estampado en caliente. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2019154727A JP7235621B2 (ja) | 2019-08-27 | 2019-08-27 | 低強度ホットスタンプ用鋼板、ホットスタンプ部品およびホットスタンプ部品の製造方法 |
JP2019-154727 | 2019-08-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2021039499A1 true WO2021039499A1 (ja) | 2021-03-04 |
Family
ID=74678773
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2020/031118 WO2021039499A1 (ja) | 2019-08-27 | 2020-08-18 | 低強度ホットスタンプ用鋼板、ホットスタンプ部品およびホットスタンプ部品の製造方法 |
Country Status (9)
Country | Link |
---|---|
US (1) | US20220298592A1 (ja) |
EP (1) | EP3998359A4 (ja) |
JP (1) | JP7235621B2 (ja) |
KR (1) | KR20220035961A (ja) |
CN (1) | CN114258434B (ja) |
BR (1) | BR112022003304A2 (ja) |
CA (1) | CA3150774A1 (ja) |
MX (1) | MX2022002260A (ja) |
WO (1) | WO2021039499A1 (ja) |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004058082A (ja) * | 2002-07-26 | 2004-02-26 | Aisin Takaoka Ltd | テーラードブランクプレス成形品の製造方法 |
JP2004270029A (ja) * | 2003-02-18 | 2004-09-30 | Nippon Steel Corp | 耐亜鉛揮発性に優れた亜鉛系めっき鋼板 |
JP4427462B2 (ja) | 2005-01-21 | 2010-03-10 | 新日本製鐵株式会社 | 車両用鋼部材及びその製造方法 |
JP4452157B2 (ja) | 2004-02-06 | 2010-04-21 | 新日本製鐵株式会社 | 部材内の強度均一性に優れる600〜1200MPa級自動車用高強度部材およびその製造方法 |
JP5726419B2 (ja) | 2007-03-14 | 2015-06-03 | アルセロールミタル・フランス | 延性が改善された装置レス熱間成形または焼入れ用鋼 |
WO2018078844A1 (ja) * | 2016-10-31 | 2018-05-03 | 新日鐵住金株式会社 | 鋼部品の製造方法及び鋼部品 |
WO2019069938A1 (ja) * | 2017-10-02 | 2019-04-11 | 新日鐵住金株式会社 | ホットスタンプ成形品およびホットスタンプ用鋼板ならびにそれらの製造方法 |
JP2019154727A (ja) | 2018-03-12 | 2019-09-19 | 株式会社三共 | スロットマシン |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU717294B2 (en) * | 1997-03-17 | 2000-03-23 | Nippon Steel & Sumitomo Metal Corporation | Dual-phase high-strength steel sheet having excellent dynamic deformation properties and process for preparing the same |
JPH11104750A (ja) * | 1997-09-30 | 1999-04-20 | Nissan Motor Co Ltd | 突き合わせ溶接板のプレス成形方法 |
JP4520549B2 (ja) * | 1999-06-23 | 2010-08-04 | 新日本製鐵株式会社 | 成形性の優れた異材質テーラードブランク材のプレス成形法 |
TWI290586B (en) * | 2003-09-24 | 2007-12-01 | Nippon Steel Corp | Hot rolled steel sheet and method of producing the same |
JP4757022B2 (ja) * | 2005-12-28 | 2011-08-24 | 住友軽金属工業株式会社 | 耐食性に優れた高強度、高靭性アルミニウム合金押出材および鍛造材、該押出材および鍛造材の製造方法 |
CN101443467B (zh) * | 2006-05-16 | 2011-11-09 | 杰富意钢铁株式会社 | 延伸特性、延伸凸缘特性及拉伸疲劳特性优良的高强度热轧钢板及其制造方法 |
JP5825082B2 (ja) * | 2011-12-12 | 2015-12-02 | Jfeスチール株式会社 | 伸び及び伸びフランジ性に優れた高降伏比高強度冷延鋼板とその製造方法 |
JP5316634B2 (ja) * | 2011-12-19 | 2013-10-16 | Jfeスチール株式会社 | 加工性に優れた高強度鋼板およびその製造方法 |
EP2803748B1 (en) * | 2012-01-13 | 2018-03-14 | Nippon Steel & Sumitomo Metal Corporation | Hot stamp molded article, and method for producing hot stamp molded article |
JP5476452B2 (ja) * | 2012-11-27 | 2014-04-23 | トヨタ自動車株式会社 | 耐食性に優れた高強度、高靭性アルミニウム合金鍛造材とその製造方法、およびサスペンション部品 |
PL2982772T3 (pl) * | 2013-04-02 | 2019-03-29 | Nippon Steel & Sumitomo Metal Corporation | Wyrób formowany przez wytłaczanie na gorąco, blacha stalowa cienka walcowana na zimno i sposób wytwarzania wyrobu formowanego przez wytłaczanie na gorąco |
JP6121292B2 (ja) * | 2013-09-05 | 2017-04-26 | 株式会社神戸製鋼所 | 高い降伏比と成形性を有する高強度鋼板及びその製造方法 |
CN107208211B (zh) * | 2015-03-30 | 2018-12-04 | 新日铁住金株式会社 | 冷锻用时效硬化用钢 |
-
2019
- 2019-08-27 JP JP2019154727A patent/JP7235621B2/ja active Active
-
2020
- 2020-08-18 CN CN202080058196.3A patent/CN114258434B/zh active Active
- 2020-08-18 KR KR1020227006022A patent/KR20220035961A/ko not_active Application Discontinuation
- 2020-08-18 CA CA3150774A patent/CA3150774A1/en active Pending
- 2020-08-18 WO PCT/JP2020/031118 patent/WO2021039499A1/ja unknown
- 2020-08-18 US US17/636,803 patent/US20220298592A1/en active Pending
- 2020-08-18 BR BR112022003304A patent/BR112022003304A2/pt unknown
- 2020-08-18 EP EP20856767.7A patent/EP3998359A4/en active Pending
- 2020-08-18 MX MX2022002260A patent/MX2022002260A/es unknown
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004058082A (ja) * | 2002-07-26 | 2004-02-26 | Aisin Takaoka Ltd | テーラードブランクプレス成形品の製造方法 |
JP2004270029A (ja) * | 2003-02-18 | 2004-09-30 | Nippon Steel Corp | 耐亜鉛揮発性に優れた亜鉛系めっき鋼板 |
JP4452157B2 (ja) | 2004-02-06 | 2010-04-21 | 新日本製鐵株式会社 | 部材内の強度均一性に優れる600〜1200MPa級自動車用高強度部材およびその製造方法 |
JP4427462B2 (ja) | 2005-01-21 | 2010-03-10 | 新日本製鐵株式会社 | 車両用鋼部材及びその製造方法 |
JP5726419B2 (ja) | 2007-03-14 | 2015-06-03 | アルセロールミタル・フランス | 延性が改善された装置レス熱間成形または焼入れ用鋼 |
WO2018078844A1 (ja) * | 2016-10-31 | 2018-05-03 | 新日鐵住金株式会社 | 鋼部品の製造方法及び鋼部品 |
WO2019069938A1 (ja) * | 2017-10-02 | 2019-04-11 | 新日鐵住金株式会社 | ホットスタンプ成形品およびホットスタンプ用鋼板ならびにそれらの製造方法 |
JP2019154727A (ja) | 2018-03-12 | 2019-09-19 | 株式会社三共 | スロットマシン |
Non-Patent Citations (1)
Title |
---|
"Leslie Steel Materials Science", 31 May 1985, MARUZEN CO., LTD., pages: 273 |
Also Published As
Publication number | Publication date |
---|---|
JP2021031745A (ja) | 2021-03-01 |
MX2022002260A (es) | 2022-03-22 |
CN114258434A (zh) | 2022-03-29 |
KR20220035961A (ko) | 2022-03-22 |
EP3998359A1 (en) | 2022-05-18 |
EP3998359A4 (en) | 2023-04-19 |
US20220298592A1 (en) | 2022-09-22 |
CN114258434B (zh) | 2022-12-23 |
BR112022003304A2 (pt) | 2022-05-24 |
CA3150774A1 (en) | 2021-03-04 |
JP7235621B2 (ja) | 2023-03-08 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP3372703B1 (en) | Ultra-high strength steel plate having excellent formability and hole-expandability, and method for manufacturing same | |
JP3857939B2 (ja) | 局部延性に優れた高強度高延性鋼および鋼板並びにその鋼板の製造方法 | |
JP4811528B2 (ja) | 高強度冷延鋼板およびその製造方法 | |
JP6924284B2 (ja) | 低コストで高成形性の1180MPa級冷間圧延焼鈍二相鋼板およびその製造方法 | |
JP6766190B2 (ja) | 降伏強度に優れた超高強度高延性鋼板及びその製造方法 | |
CN107709592B (zh) | 铁素体系不锈钢板及其制造方法 | |
JP6282577B2 (ja) | 高強度高延性鋼板 | |
CN104204261A (zh) | 高强度冷轧钢板和生产这种钢板的方法 | |
KR20150110723A (ko) | 780 MPa급 냉간 압연 2상 스트립 강 및 그의 제조방법 | |
JP6223905B2 (ja) | 降伏強度と加工性に優れた高強度合金化溶融亜鉛めっき鋼板 | |
JP6519016B2 (ja) | 熱延鋼板及びその製造方法 | |
JP5126844B2 (ja) | 熱間プレス用鋼板およびその製造方法ならびに熱間プレス鋼板部材の製造方法 | |
JP2006131958A (ja) | 強度−延性バランスおよび溶接性に優れた厚鋼板およびその製造方法 | |
CN109072387A (zh) | 屈服比优异的超高强度高延展性钢板及其制造方法 | |
EP3231886B1 (en) | Complex-phase steel sheet with excellent formability and manufacturing method therefor | |
JP2003155543A (ja) | 深絞り性に優れ面内異方性の小さいフェライト系ステンレス鋼及びその製造方法 | |
JP6361402B2 (ja) | ばね用複相ステンレス鋼およびその製造方法 | |
JP2023071938A (ja) | 延性及び加工性に優れた高強度鋼板、及びその製造方法 | |
KR101726139B1 (ko) | 연신율 및 충격 인성이 우수한 열간 프레스 부재 및 그 제조방법 | |
WO2021039499A1 (ja) | 低強度ホットスタンプ用鋼板、ホットスタンプ部品およびホットスタンプ部品の製造方法 | |
JP3886864B2 (ja) | 二次加工性に優れるフェライト系ステンレス鋼冷延焼鈍材及びその製造方法 | |
JP6348436B2 (ja) | 高強度高延性鋼板 | |
KR102220739B1 (ko) | 두께 중심부 인성이 우수한 극후물 강판의 제조방법 | |
EP3708691B1 (en) | Manufacturing method for ultrahigh-strength and high-ductility steel sheet having excellent cold formability | |
JP6541504B2 (ja) | 製造安定性に優れた高強度高延性鋼板、及びその製造方法、並びに高強度高延性鋼板の製造に用いられる冷延原板 |
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: 20856767 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 3150774 Country of ref document: CA |
|
ENP | Entry into the national phase |
Ref document number: 2020856767 Country of ref document: EP Effective date: 20220208 |
|
ENP | Entry into the national phase |
Ref document number: 20227006022 Country of ref document: KR 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: 112022003304 Country of ref document: BR |
|
ENP | Entry into the national phase |
Ref document number: 112022003304 Country of ref document: BR Kind code of ref document: A2 Effective date: 20220222 |