USRE44940E1 - Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment - Google Patents

Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment Download PDF

Info

Publication number
USRE44940E1
USRE44940E1 US13/863,100 US201313863100A USRE44940E US RE44940 E1 USRE44940 E1 US RE44940E1 US 201313863100 A US201313863100 A US 201313863100A US RE44940 E USRE44940 E US RE44940E
Authority
US
United States
Prior art keywords
steel sheet
coated steel
aluminum
sheet
hot
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US13/863,100
Inventor
Jean-Pierre Laurent
Jean-Paul Hennechart
Dominique Spehner
Jacques Devroc
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ArcelorMittal Atlantique et Lorraine SAS
ArcelorMittal SA
Original Assignee
ArcelorMittal France SA
ArcelorMittal Atlantique et Lorraine SAS
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9528455&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=USRE44940(E1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by ArcelorMittal France SA, ArcelorMittal Atlantique et Lorraine SAS filed Critical ArcelorMittal France SA
Priority to US13/863,100 priority Critical patent/USRE44940E1/en
Application granted granted Critical
Publication of USRE44940E1 publication Critical patent/USRE44940E1/en
Assigned to ARCELORMITTAL reassignment ARCELORMITTAL ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ARCELORMITTAL FRANCE
Assigned to ARCELOR ATLANTIQUE ET LORRAINE reassignment ARCELOR ATLANTIQUE ET LORRAINE PATENT CO-OWNERSHIP AGREEMENT Assignors: ARCELOR FRANCE
Assigned to ARCELOR ATLANTIQUE ET LORRAINE reassignment ARCELOR ATLANTIQUE ET LORRAINE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ARCELOR FRANCE
Assigned to ARCELOR FRANCE reassignment ARCELOR FRANCE CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: USINOR
Assigned to USINOR reassignment USINOR CORPORATE DISSOLUTION WITHOUT LIQUIDATION AND TRANSFER OF RIGHTS Assignors: SOLLAC
Assigned to ARCELORMITTAL FRANCE reassignment ARCELORMITTAL FRANCE CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: ARCELOR FRANCE
Assigned to ARCELORMITTAL ATLANTIQUE ET LORRAINE reassignment ARCELORMITTAL ATLANTIQUE ET LORRAINE CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: ARCELOR ATLANTIQUE ET LORRAINE
Assigned to ARCELORMITTAL FRANCE reassignment ARCELORMITTAL FRANCE CHANGE OF ADDRESS Assignors: ARCELORMITTAL FRANCE
Assigned to USINOR reassignment USINOR MERGER (SEE DOCUMENT FOR DETAILS). Assignors: SOLLAC
Assigned to SOLLAC reassignment SOLLAC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DEVROC, JAQUES, HENNECHART, JEAN-PAUL, LAURENT, JEAN-PIERRE, SPEHNER, DOMINIQUE
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • 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
    • C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/922—Static electricity metal bleed-off metallic stock
    • Y10S428/9335—Product by special process
    • Y10S428/939—Molten or fused coating
    • 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 invention relates to a coated, hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment.
  • the proposed solutions involving an increase in the mechanical characteristics are accomplished to the detriment of shaping properties.
  • the characteristics required for use are obtained through a thermal treatment subsequent to or concomitant with shaping.
  • the proposed sheets are not delivered coated because of problems of holding power of the coating at the time of thermal treatment. Coating therefore is performed on finished castings, which requires a careful cleaning of the surfaces and the hollowed portions.
  • the thermal treatment must be performed under a controlled atmosphere in order to prevent any decarbonization and oxidation of the metal in the sheet.
  • Steel sheets for thermal treatment do not have any precoating which requires post-treatments of scouring, pickling and coating.
  • preliminary annealing and cooling preceding or following the zinc- or aluminum-based coating operation are used only to bring the sheet to a temperature close to that of the bath or to restore the mechanical properties of the sheet degraded at the time of cold-rolling.
  • These thermal cycles are chosen in terms of the composition of the steel so that no allotropic transformation takes place at the time of the thermal cycle, the objective being to obtain mechanical characteristics similar to those measured on the steel sheet delivered uncoated.
  • the purpose of the invention is to produce a hot- or cold-rolled steel sheet of a desired thickness, coated, and affording extensive shaping possibilities and which, after thermal treatment performed on the finished casting, makes it possible to obtain a mechanical resistance in excess of 1000 MPa, a substantial resistance to shocks, fatigue, abrasion and wear, while retaining a good resistance to corrosion as well as a good capacity for painting and gluing. It also is possible to carry out hot-shaping with hardening in the tool making it possible to obtain the same properties.
  • the subject of the invention is a hot-rolled steel sheet, which then can be cold-rolled, coated, the steel in the sheet having the following composition by weight:
  • the invention also concerns a process for producing a casting starting from the coated sheet in which, after shaping, the coating of the casting is subjected to an increase in temperature at a speed in excess of 5° C./second, which may exceed 600° C./second.
  • the invention also concerns the use of the hot-rolled steel sheet which then can be cold-rolled and coated, for structural and/or anti-intrusion or substructure castings for a land motor vehicle, such as, for example, a bumper bar, a door reinforcement, a wheel spoke.
  • the sheet according to the invention which derives, by reason of its processing, from a hot-rolling mill, possibly may be cold-rerolled again depending on the final thickness desired. It then is coated with an aluminum-based coating, for example by dipping in a bath containing, in addition, from 8% to 11% silicon, from 2% to 4% iron, the sheet having a high mechanical resistance after thermal treatment and a high resistance to corrosion, as well as a good capacity for painting and gluing.
  • the coating has in particular the function of protecting the basic sheet against hot as well as cold corrosion.
  • the mechanical characteristics in the delivery state of the sheet according to the invention allow a great variety of shaping, in particular a deep stamping.
  • the thermal treatment applied at the time of a hot-shaping process or alter shaping makes it possible to obtain high mechanical characteristics which may exceed 1500 MPa for mechanical resistance and 1200 MPa for the limit of elasticity.
  • the final mechanical characteristics are adjustable and depend on the carbon content of the steel and on the thermal treatment.
  • the coating forms a layer having a substantial resistance to abrasion, wear, fatigue, shock, as well as a good resistance to corrosion and a good capacity for painting and gluing.
  • the steel the weight composition of which is the following:
  • the coating layer comprises a first alloy layer in contact with the surface of the steel. This layer, directly in contact with the surface of the sheet, is highly alloyed with iron.
  • a second coating layer, on top of the first, contains approximately 90% aluminum and may contain silicon and a small amount of iron, depending on the composition of the bath.
  • the first alloy layer may crack when the sheet is shaped for the manufacture of castings.
  • the coating is subjected to an increase in temperature at a speed in excess of 5° C./second, which may exceed 600° C./second. This rise in temperature makes possible a rapid remelting of the aluminum which fills in the cracks generated by the operation of shaping of the casting.
  • Another advantage of the invention lies in the fact that the diffusion of the iron in the coating will be initiated at high temperature. One thus will have a better cohesion between coating and steel in the sheet.
  • the thermal treatment may be performed locally, in heavily deformed zones.
  • the steel sheet according to the invention containing 0.21% carbon, 1.14% manganese, 0.020% phosphorus, 0.0038% sulfur, 0.25% silicon, 0.040% aluminum, 0.009% copper, 0.020% nickel, 0.18% chromium, 0.0040% nitrogen, 0.032% titanium, 0.003% boron, 0.0050% calcium is coated with an aluminum-based layer about 20 ⁇ m in thickness.
  • the sheet in the delivery state in a coil or in sheeting, the thickness of which may range between 0.25 mm and 15 mm, has good shaping properties and a good resistance to corrosion as well as a good capacity for painting or gluing.
  • the sheet, a coated siderurgic product has a substantial resistance to corrosion in the delivery state, during shaping and thermal treatments as well as during usage of the finished casting. After thermal treatment, a substantial mechanical resistance, which may exceed 1500 MPa, is obtained.
  • the presence of the coating at the time of thermal treatment of the castings makes it possible to prevent any decarbonization of the base metal as well as any oxidation. That is an undeniable advantage, in particular in the case of hot-shaping. Furthermore, heating of the treated casting does not require a furnace having a controlled atmosphere to prevent a decarbonization.
  • Thermal treatment of the metal in the sheet consists in a heating at a temperature ranging between Ac1, starting temperature of austenitic transformation, for example 750° C. and 1200° C., in a furnace, for a period which depends on the temperature to be reached and the thickness of the casting sheet.
  • the composition is optimized so as to limit the enlargement of the grains at the time of thermal treatment. If the structure sought is completely martensitic, the holding temperature should be in excess of Ac3, for example 840° C., ending temperature of austenitic formation. The temperature holding should be followed by a cooling adjusted to the final structure sought.
  • the speed of cooling should be in excess of the critical speed of hardening which is 27° C./s for an austenitizing at 900° C. for 5 min., the sheet having a thickness of approximately 1 mm.
  • ferrito-bainitic or ferrito-martensitic structures by a heating at a temperature ranging between Ac1, for example 750° C. and Ac3, for example 840° C., followed by an appropriate cooling.
  • a heating at a temperature ranging between Ac1, for example 750° C. and Ac3, for example 840° C., followed by an appropriate cooling.
  • one or several of these phases is/are present in variable proportions.
  • the structure is composed predominantly of martensite.
  • Chromium, manganese, boron and carbon are added, in the composition of the steel according to the invention, for their effect on hardenability.
  • carbon makes it possible to achieve high mechanical characteristics thanks to its effect on the hardness of the martensite.
  • Aluminum is introduced into the composition in order to trap oxygen and to protect the effectiveness of the boron.
  • Titanium the ratio of the content of which with respect to the nitrogen content should be in excess of 3.42, is introduced in order to prevent combining of the boron with the nitrogen, the nitrogen being combined with titanium.
  • the alloying elements, Mn, Cr, B make possible a hardenability allowing hardening in the stampers or the use of mild hardening fluids limiting deformation of the castings at the time of thermal treatment.
  • the composition according to the invention is optimized from the point of view of weldability.
  • the steel in the sheet may undergo a treatment for globularization of sulfides performed with calcium, which has the effect of improving the fatigue resistance of the sheet.
  • the steel is particularly suited to the production of structural and anti-intrusion castings.
  • the proposed coating makes it possible to avoid different surface-preparation operations such as for steel sheets for thermal treatment not having any coating.
  • the modulation of thermal treatment parameters makes it possible to achieve, with a given composition, different levels of hot and cold sheet resistance according to the thickness sought.
  • the base coating of aluminum for example, is transformed into a layer alloyed with iron and comprising different phases depending on the thermal treatment and having a considerable hardness which may exceed 600 HV100 g.
  • Table 2 presents an example of maximal resistance of the steel sheet according to the invention after thermal treatment.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Coating With Molten Metal (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Laminated Bodies (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

Hot-rolled steel sheet which then can be cold-rolled, coated, the steel in the sheet having the following composition by weight:
    • 0.15%<carbon<0.5%
    • 0.5%<manganese<3%
    • 0.1%<silicon<0.5%
    • 0.01%<chromium<1%
    • titanium<0.2%
    • aluminum<0.1%
    • phosphorus<0.1%
    • sulfur<0.05%
    • 0.0005%<boron<0.08%, the remainder being iron and impurities inherent in processing, the shoot ensuring a very high mechanical resistance after thermal treatment and the aluminum-based coating ensuring a high resistance to corrosion.

Description

Notice: More than one reissue application has been filed for the reissue of U.S. Pat. No. 6,296,805. This application is a reissue continuation of U.S. application Ser. No. 13/205,126, filed Aug. 8, 2011, which is an application for reissue of U.S. Pat. No. 6,296,805.
The invention relates to a coated, hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment.
In this technical area, the proposed solutions involving an increase in the mechanical characteristics are accomplished to the detriment of shaping properties. There is a solution consisting in separating the shaping properties and those required for use. The characteristics required for use are obtained through a thermal treatment subsequent to or concomitant with shaping. In this case, the proposed sheets are not delivered coated because of problems of holding power of the coating at the time of thermal treatment. Coating therefore is performed on finished castings, which requires a careful cleaning of the surfaces and the hollowed portions. In addition, the thermal treatment must be performed under a controlled atmosphere in order to prevent any decarbonization and oxidation of the metal in the sheet. Steel sheets for thermal treatment do not have any precoating which requires post-treatments of scouring, pickling and coating.
At the time of continuous coating of flat hot- and cold-rolled products, preliminary annealing and cooling preceding or following the zinc- or aluminum-based coating operation, are used only to bring the sheet to a temperature close to that of the bath or to restore the mechanical properties of the sheet degraded at the time of cold-rolling. These thermal cycles are chosen in terms of the composition of the steel so that no allotropic transformation takes place at the time of the thermal cycle, the objective being to obtain mechanical characteristics similar to those measured on the steel sheet delivered uncoated.
The purpose of the invention is to produce a hot- or cold-rolled steel sheet of a desired thickness, coated, and affording extensive shaping possibilities and which, after thermal treatment performed on the finished casting, makes it possible to obtain a mechanical resistance in excess of 1000 MPa, a substantial resistance to shocks, fatigue, abrasion and wear, while retaining a good resistance to corrosion as well as a good capacity for painting and gluing. It also is possible to carry out hot-shaping with hardening in the tool making it possible to obtain the same properties.
The subject of the invention is a hot-rolled steel sheet, which then can be cold-rolled, coated, the steel in the sheet having the following composition by weight:
    • 0.15%<carbon<0.5%
    • 0.5%<manganese<3%
    • 0.1% silicon<0.5%
    • 0.01%<chromium<1%
    • titanium<0.2%
    • aluminum<0.1%
    • phosphorus<0.01%
    • sulfur<0.05%
    • 0.0005%<boron<0.08%, the remainder being iron and impurities inherent in processing, the sheet ensuring a very high mechanical resistance after thermal treatment and the aluminum-based coating ensuring a high resistance to corrosion.
The other characteristics of the invention are:
    • the composition by weight of the sheet preferably is the following:
      • 0.20%<carbon<0.5%
      • 0.8%<manganese<1.5%
      • 0.1% silicon<0.35%
      • 0.01%<chromium<1%
      • titanium<0.1%
      • aluminum<0.1%
      • phosphorus<0.05%
      • sulfur<0.03%
      • 0.0005%<boron<0.01%, the remainder being iron and impurities inherent in processing.
    • in the composition by weight of the sheet, the titanium content with respect to the nitrogen content is in excess of 3.42, the boron no longer being able to be combined with the nitrogen.
    • the metal bath for the coating contains in its basic composition by weight, from 9% to 10% silicon, from 2% to 3.5% iron, the remainder being aluminum.
    • the metal bath for the coating contains in its basic composition by weight, from 2% to 4% iron, the remainder being aluminum.
The invention also concerns a process for producing a casting starting from the coated sheet in which, after shaping, the coating of the casting is subjected to an increase in temperature at a speed in excess of 5° C./second, which may exceed 600° C./second.
A further characteristic of the process is:
    • the coating and the casting are heated to a temperature in excess of 750° C.
The invention also concerns the use of the hot-rolled steel sheet which then can be cold-rolled and coated, for structural and/or anti-intrusion or substructure castings for a land motor vehicle, such as, for example, a bumper bar, a door reinforcement, a wheel spoke.
The description which follows wilt make the invention clearly understood.
The sheet according to the invention which derives, by reason of its processing, from a hot-rolling mill, possibly may be cold-rerolled again depending on the final thickness desired. It then is coated with an aluminum-based coating, for example by dipping in a bath containing, in addition, from 8% to 11% silicon, from 2% to 4% iron, the sheet having a high mechanical resistance after thermal treatment and a high resistance to corrosion, as well as a good capacity for painting and gluing.
The coating has in particular the function of protecting the basic sheet against hot as well as cold corrosion. The mechanical characteristics in the delivery state of the sheet according to the invention allow a great variety of shaping, in particular a deep stamping. The thermal treatment applied at the time of a hot-shaping process or alter shaping makes it possible to obtain high mechanical characteristics which may exceed 1500 MPa for mechanical resistance and 1200 MPa for the limit of elasticity. The final mechanical characteristics are adjustable and depend on the carbon content of the steel and on the thermal treatment.
At the time of thermal treatment performed on a finished casting or at the time of a hot-shaping process, the coating forms a layer having a substantial resistance to abrasion, wear, fatigue, shock, as well as a good resistance to corrosion and a good capacity for painting and gluing.
According to the invention, the steel the weight composition of which is the following:
    • 0.15%<carbon<0.5%
    • 0.5%<manganese<3%
    • 0.1%<silicon <0.5%
    • 0.01%<chromium<1%
    • titanium<0.2%
    • aluminum<0.1%
    • phosphorus<0.1%
    • sulfur<0.05%
    • 0.0005%<boron<0.08%, the remainder being iron and impurities inherent in processing, is processed in the form of a hot-rolled and possibly cold-rolled sheet to obtain the desired thickness. The steel sheet then is coated by dipping, after pickling, in an aluminum bath containing either from 8% to 11% silicon and 2% to 4% iron, or from 2% to 4% iron, or even in an aluminum bath preferably containing from 9% to 10% silicon and 2% to 3.5% iron.
In an example of implementation of a coating of the sheet by dipping in a metal bath containing an aluminum alloy comprising a proportion of approximately 90% aluminum, the coating layer comprises a first alloy layer in contact with the surface of the steel. This layer, directly in contact with the surface of the sheet, is highly alloyed with iron.
A second coating layer, on top of the first, contains approximately 90% aluminum and may contain silicon and a small amount of iron, depending on the composition of the bath.
The first alloy layer may crack when the sheet is shaped for the manufacture of castings.
According to the invention, after the shaping of the casting, the coating is subjected to an increase in temperature at a speed in excess of 5° C./second, which may exceed 600° C./second. This rise in temperature makes possible a rapid remelting of the aluminum which fills in the cracks generated by the operation of shaping of the casting.
Another advantage of the invention lies in the fact that the diffusion of the iron in the coating will be initiated at high temperature. One thus will have a better cohesion between coating and steel in the sheet. In another form of the invention, the thermal treatment may be performed locally, in heavily deformed zones.
In an example of implementation, the steel sheet according to the invention containing 0.21% carbon, 1.14% manganese, 0.020% phosphorus, 0.0038% sulfur, 0.25% silicon, 0.040% aluminum, 0.009% copper, 0.020% nickel, 0.18% chromium, 0.0040% nitrogen, 0.032% titanium, 0.003% boron, 0.0050% calcium is coated with an aluminum-based layer about 20 μm in thickness.
According to the invention the sheet, in the delivery state in a coil or in sheeting, the thickness of which may range between 0.25 mm and 15 mm, has good shaping properties and a good resistance to corrosion as well as a good capacity for painting or gluing.
The sheet, a coated siderurgic product, has a substantial resistance to corrosion in the delivery state, during shaping and thermal treatments as well as during usage of the finished casting. After thermal treatment, a substantial mechanical resistance, which may exceed 1500 MPa, is obtained. The presence of the coating at the time of thermal treatment of the castings makes it possible to prevent any decarbonization of the base metal as well as any oxidation. That is an undeniable advantage, in particular in the case of hot-shaping. Furthermore, heating of the treated casting does not require a furnace having a controlled atmosphere to prevent a decarbonization.
Thermal treatment of the metal in the sheet consists in a heating at a temperature ranging between Ac1, starting temperature of austenitic transformation, for example 750° C. and 1200° C., in a furnace, for a period which depends on the temperature to be reached and the thickness of the casting sheet. The composition is optimized so as to limit the enlargement of the grains at the time of thermal treatment. If the structure sought is completely martensitic, the holding temperature should be in excess of Ac3, for example 840° C., ending temperature of austenitic formation. The temperature holding should be followed by a cooling adjusted to the final structure sought. For a completely martensitic structure and for a steel having the composition of the example, the speed of cooling should be in excess of the critical speed of hardening which is 27° C./s for an austenitizing at 900° C. for 5 min., the sheet having a thickness of approximately 1 mm.
It also is possible to obtain in particular ferrito-bainitic or ferrito-martensitic structures, by a heating at a temperature ranging between Ac1, for example 750° C. and Ac3, for example 840° C., followed by an appropriate cooling. According to the level of resistance to be achieved and the thermal treatment applied, one or several of these phases is/are present in variable proportions. For the highest resistance levels, the structure is composed predominantly of martensite.
Chromium, manganese, boron and carbon are added, in the composition of the steel according to the invention, for their effect on hardenability. In addition, carbon makes it possible to achieve high mechanical characteristics thanks to its effect on the hardness of the martensite.
Aluminum is introduced into the composition in order to trap oxygen and to protect the effectiveness of the boron.
Titanium, the ratio of the content of which with respect to the nitrogen content should be in excess of 3.42, is introduced in order to prevent combining of the boron with the nitrogen, the nitrogen being combined with titanium.
The alloying elements, Mn, Cr, B, make possible a hardenability allowing hardening in the stampers or the use of mild hardening fluids limiting deformation of the castings at the time of thermal treatment. In addition, the composition according to the invention is optimized from the point of view of weldability.
The steel in the sheet may undergo a treatment for globularization of sulfides performed with calcium, which has the effect of improving the fatigue resistance of the sheet.
The steel is particularly suited to the production of structural and anti-intrusion castings.
The proposed coating makes it possible to avoid different surface-preparation operations such as for steel sheets for thermal treatment not having any coating.
The modulation of thermal treatment parameters makes it possible to achieve, with a given composition, different levels of hot and cold sheet resistance according to the thickness sought.
At the time of thermal treatment, the base coating, of aluminum for example, is transformed into a layer alloyed with iron and comprising different phases depending on the thermal treatment and having a considerable hardness which may exceed 600 HV100 g.
Table 2 presents an example of maximal resistance of the steel sheet according to the invention after thermal treatment.
Thermal treatment Rm (MPa)
850° C./5 min. 1695
990° C./5 min. 1675
950° C./5 min. 1665

Claims (29)

What is claimed is:
1. A hot-rolled coated steel sheet comprising a hot-rolled steel sheet coated with an aluminum or aluminum alloy coating, wherein the steel in the sheet comprises the following composition by weight:
0.15%<carbon<0.5%
0.5%<manganese<3%
0.1%<silicon<0.5%
0.01% <chromium<1%
titanium<0.2%
aluminum<0.1%
phosphorus<0.1%
sulfur<0.05%
0.0005%<boron<0.08%, the remainder being iron and impurities inherent in processing, and the steel sheet has a very high mechanical resistance after thermal treatment and the aluminum or aluminum alloy coating provides a high resistance to corrosion of the steel sheet.
2. The coated steel sheet according to claim 1, wherein the composition by weight of the sheet further comprises the following:
0.20%<carbon<0.5%
0.8%<manganese<1.5%
0.1%<silicon<0.35%
0.01%<chromium<1%
titanium<0.1%
aluminum<0.1%
phosphorus<0.05%
sulfur 0.03%
0.0005%<boron<0.01%, the remainder being iron and impurities inherent in processing.
3. A heat treated coated steel sheet prepared by subjecting the coated steel sheet according to claim 2, to an increase in temperature at a speed in excess of 600° C./second.
4. A process for producing a casting comprising
shaping the coated steel sheet of claim 2,
subjecting the shaped coated steel sheet to an increase in temperature at a speed in excess of 5° C./sec.
5. The coated steel sheet according to claim 1, wherein the ratio of titanium to nitrogen in the steel sheet in weight % is in excess of 3.42.
6. A process for producing a casting comprising
shaping the coated steel sheet of claim 5,
subjecting the shaped coated steel sheet to an increase in temperature at a speed in excess of 5° C./sec.
7. The coated steel sheet according to claim 1, wherein the aluminum or aluminum alloy coating comprises from 9% to 10% silicon by weight, from 2% to 3.5% iron by weight, the remainder being aluminum.
8. A process for producing a casting comprising
shaping the coated steel sheet of claim 7,
subjecting the shaped coated steel sheet to an increase in temperature at a speed in excess of 5° C./sec.
9. The coated steel sheet according to claim 1, wherein the coating comprises from 2% to 4% iron by weight, the remainder being aluminum.
10. A process for producing a casting comprising
shaping the coated steel sheet of claim 9,
subjecting the shaped coated steel sheet to an increase in temperature at a speed in excess of 5° C./sec.
11. A process for producing a casting comprising
shaping the coated steel sheet of claim 1,
subjecting the shaped coated steel sheet to an increase in temperature at a speed in excess of 5° C./second.
12. The process according to claim 11, wherein the casting is heated to a temperature in excess of 750° C.
13. A heat treated coated steel sheet prepared by subjecting the coated steel sheet according to claim 1 to an increase in temperature at a speed in excess of 600° C./second.
14. A land motor vehicle comprising the heat treated coated steel of claim 13.
15. A land motor vehicle comprising the coated steel sheet of claim 1.
16. A heat treated coated steel sheet prepared by subjecting the coated steel sheet according to claim 1 to a temperature in excess of 750° C.
17. A hot-rolled coated steel sheet comprising a hot-rolled steel sheet coated with an aluminum or aluminum alloy coating, wherein said coated steel sheet is in the form of a delivery coil and the steel in the sheet comprises the following composition by weight:
0.15%<carbon<0.5%
0.5%<manganese<3%
0.1%<silicon<0.5%
0.01%<chromium<1%
titanium<0.2%
aluminum<0.1%
phosphorus<0.1%
sulfur<0.05%
0.0005%<boron<0.08%, the remainder being iron and impurities inherent in processing, and the steel sheet has a very high mechanical resistance in excess of 1500 MPa after thermal treatment and the aluminum or aluminum alloy coating provides a high resistance to corrosion of the steel sheet.
18. The coated steel sheet of claim 17 that is manufactured by a process comprising providing said hot rolled sheet; and coating said hot rolled sheet with an aluminum coating or aluminum alloy coating.
19. The coated steel sheet of claim 18 wherein said aluminum or aluminum alloy coating is obtained by hot-dipping and comprises, before said thermal treatment, a first alloy layer in contact with the surface of the steel, and a second alloy layer on top of the first alloy layer.
20. The coated steel sheet of claim 19 wherein the first coating layer comprises iron.
21. The coated steel sheet of claim 19 wherein the second coating layer comprises iron.
22. The coated steel sheet of claim 17 wherein the aluminum coating or aluminum alloy coating has a thickness of about 20 micrometers.
23. The coated steel sheet of claim 17 wherein the steel in the sheet is treated with calcium.
24. A coated steel sheet according to claim 17, manufactured by a process comprising a step of cold-rolling before said aluminum or aluminum alloy coating.
25. The coated steel sheet of claim 24 that is composed predominately of martensite.
26. The coated steel sheet of claim 24 wherein said subsequent thermal treatment includes hot-shaping the coated steel sheet, and cooling the hot-shaped sheet at a rate that produces martensitic structures, ferrite-martensitic structures , or ferrite-bainitic structures.
27. A hot-rolled coated steel sheet comprising a hot-rolled steel sheet coated with an aluminum or aluminum alloy coating, wherein the steel in the sheet comprises the following composition by weight:
0.15%<carbon<0.5%
0.5%<manganese<3%
0.1%<silicon<0.5%
0.01%<chromium<1%
titanium<0.2%
aluminum<0.1%
phosphorus<0.1%
sulfur<0.05%
0.0005%<boron<0.08%, the remainder being iron and impurities inherent in processing, and the steel sheet has a very high mechanical resistance in excess of 1500 MPa after a subsequent thermal treatment, and the aluminum or aluminum alloy coating provides a high resistance to corrosion and prevents decarburization during said subsequent thermal treatment of the steel sheet.
28. The coated steel sheet of claim 27 that is composed predominately of martensite.
29. The coated steel sheet of claim 27 wherein said subsequent thermal treatment includes hot-shaping the coated steel sheet, and cooling the hot-shaped sheet at a rate that produces martensitic structures, ferrite-martensitic structures, or ferrite-bainitic structures.
US13/863,100 1998-07-09 2013-04-15 Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment Expired - Lifetime USRE44940E1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US13/863,100 USRE44940E1 (en) 1998-07-09 2013-04-15 Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
FR9808793A FR2780984B1 (en) 1998-07-09 1998-07-09 COATED HOT AND COLD STEEL SHEET HAVING VERY HIGH RESISTANCE AFTER HEAT TREATMENT
FR9808793 1998-07-19
US09/350,100 US6296805B1 (en) 1998-07-09 1999-07-09 Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment
US13/205,126 USRE44153E1 (en) 1998-07-09 2011-08-08 Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment
US13/863,100 USRE44940E1 (en) 1998-07-09 2013-04-15 Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US09/350,100 Reissue US6296805B1 (en) 1998-07-09 1999-07-09 Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment

Publications (1)

Publication Number Publication Date
USRE44940E1 true USRE44940E1 (en) 2014-06-10

Family

ID=9528455

Family Applications (3)

Application Number Title Priority Date Filing Date
US09/350,100 Expired - Lifetime US6296805B1 (en) 1998-07-09 1999-07-09 Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment
US13/205,126 Expired - Lifetime USRE44153E1 (en) 1998-07-09 2011-08-08 Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment
US13/863,100 Expired - Lifetime USRE44940E1 (en) 1998-07-09 2013-04-15 Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment

Family Applications Before (2)

Application Number Title Priority Date Filing Date
US09/350,100 Expired - Lifetime US6296805B1 (en) 1998-07-09 1999-07-09 Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment
US13/205,126 Expired - Lifetime USRE44153E1 (en) 1998-07-09 2011-08-08 Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment

Country Status (11)

Country Link
US (3) US6296805B1 (en)
EP (1) EP0971044B1 (en)
JP (1) JP3931251B2 (en)
AT (1) ATE240419T1 (en)
BR (1) BR9902712A (en)
CA (1) CA2276911C (en)
DE (1) DE69907816T2 (en)
DK (1) DK0971044T3 (en)
ES (1) ES2196740T3 (en)
FR (1) FR2780984B1 (en)
PT (1) PT971044E (en)

Families Citing this family (188)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2807447B1 (en) * 2000-04-07 2002-10-11 Usinor METHOD FOR MAKING A PART WITH VERY HIGH MECHANICAL CHARACTERISTICS, SHAPED BY STAMPING, FROM A STRIP OF LAMINATED AND IN PARTICULAR HOT ROLLED AND COATED STEEL SHEET
DE10113657A1 (en) * 2001-03-21 2002-09-26 Bosch Gmbh Robert Wiper blade used for cleaning vehicle windscreens comprises a rubber elastic batten arranged on a supporting element made from spring steel
JP3582504B2 (en) 2001-08-31 2004-10-27 住友金属工業株式会社 Hot-press plated steel sheet
DE60236447D1 (en) 2001-10-23 2010-07-01 Sumitomo Metal Ind PROCESS FOR HOT PRESS PROCESSING OF A PLATED STEEL PRODUCT
FR2833504A1 (en) * 2001-12-14 2003-06-20 Usinor Hot forming of motor vehicle wheel components involves hot stamping of pre-coated hot- or cold-rolled steel sheet
DE10307184B3 (en) * 2003-02-20 2004-04-08 Benteler Automobiltechnik Gmbh Production of hardened components used as aluminum vehicle parts comprises heating a metal sheet plate to a hardening temperature, hot deforming, configuring into a final shape, and hardening
JP4094473B2 (en) * 2003-04-18 2008-06-04 新日本製鐵株式会社 Steel sheet for hot forming process with excellent post-high temperature forming ability and method for using the same
EP1630244B2 (en) 2003-04-23 2016-08-17 Nippon Steel & Sumitomo Metal Corporation Hot press formed product and method for production thereof
JP4673558B2 (en) * 2004-01-26 2011-04-20 新日本製鐵株式会社 Hot press molding method and automotive member excellent in productivity
DE102004007071B4 (en) * 2004-02-13 2006-01-05 Audi Ag Method for producing a component by forming a circuit board and apparatus for carrying out the method
CA2701559C (en) 2004-09-15 2013-08-06 Nippon Steel Corporation High strength part and method of production of the same
JP4724406B2 (en) * 2004-11-04 2011-07-13 新日本製鐵株式会社 Method for producing hot-pressed high-strength steel members with low residual stress
FR2883007B1 (en) * 2005-03-11 2007-04-20 Usinor Sa PROCESS FOR MANUFACTURING A COATED STEEL MEMBER HAVING VERY HIGH RESISTANCE AFTER THERMAL TREATMENT
JP4673656B2 (en) * 2005-04-11 2011-04-20 新日本製鐵株式会社 Hot press forming equipment
DE102005030507B4 (en) * 2005-06-28 2008-04-03 Benteler Automobiltechnik Gmbh Door structure of a motor vehicle
EP1767659A1 (en) * 2005-09-21 2007-03-28 ARCELOR France Method of manufacturing multi phase microstructured steel piece
CN101346482B (en) 2005-12-26 2011-11-16 Posco公司 Carbon steel sheet superior in formability and manufacturing method thereof
WO2007118939A1 (en) 2006-04-19 2007-10-25 Arcelor France Method of producing a welded part having very high mechanical properties from a rolled and coated sheet
ATE477348T1 (en) 2006-06-07 2010-08-15 Thyssenkrupp Steel Europe Ag USE OF A FLAT PRODUCT MADE FROM A MANGANEOUS-BORON STEEL AND METHOD FOR THE PRODUCTION THEREOF
KR100760152B1 (en) 2006-06-07 2007-09-18 현대하이스코 주식회사 Manufacturing method of high strength automobile parts by zinc galvanization steel sheet using hot stamping
US9067260B2 (en) 2006-09-06 2015-06-30 Arcelormittal France Steel plate for producing light structures and method for producing said plate
US11155902B2 (en) 2006-09-27 2021-10-26 Nucor Corporation High strength, hot dip coated, dual phase, steel sheet and method of manufacturing same
WO2008053273A1 (en) 2006-10-30 2008-05-08 Arcelormittal France Coated steel strips, methods of making the same, methods of using the same, stamping blanks prepared from the same, stamped products prepared from the same, and articles of manufacture which contain such a stamped product
DE102006053819A1 (en) * 2006-11-14 2008-05-15 Thyssenkrupp Steel Ag Production of a steel component used in the chassis construction comprises heating a sheet metal part and hot press quenching the heated sheet metal part
EP2126144B1 (en) * 2007-02-23 2017-12-27 Tata Steel IJmuiden BV Method of thermomechanical shaping a final product with very high strength and a product produced thereby
JP5425770B2 (en) * 2007-07-19 2014-02-26 タタ、スティール、アイモイデン、ベスローテン、フェンノートシャップ Steel strip with varying thickness in the length direction
US8864921B2 (en) * 2007-07-19 2014-10-21 Tata Steel Ijmuiden B.V. Method for annealing a strip of steel having a variable thickness in length direction
EP2025771A1 (en) * 2007-08-15 2009-02-18 Corus Staal BV Method for producing a coated steel strip for producing taylored blanks suitable for thermomechanical shaping, strip thus produced, and use of such a coated strip
EP2045360B1 (en) * 2007-10-02 2011-11-30 ThyssenKrupp Steel Europe AG Method for manufacturing a steel part by hot forming and steel part manufactured by hot forming
DE102007061489A1 (en) 2007-12-20 2009-06-25 Voestalpine Stahl Gmbh Process for producing hardened hardenable steel components and hardenable steel strip therefor
WO2009090443A1 (en) * 2008-01-15 2009-07-23 Arcelormittal France Process for manufacturing stamped products, and stamped products prepared from the same
KR101010971B1 (en) * 2008-03-24 2011-01-26 주식회사 포스코 Steel sheet for forming having low temperature heat treatment property, method for manufacturing the same, method for manufacturing parts using the same and parts manufactured by the method
US20090242086A1 (en) * 2008-03-31 2009-10-01 Honda Motor Co., Ltd. Microstructural optimization of automotive structures
WO2009131233A1 (en) 2008-04-22 2009-10-29 新日本製鐵株式会社 Plated steel sheet and method of hot-pressing plated steel sheet
DE102008022399A1 (en) 2008-05-06 2009-11-19 Thyssenkrupp Steel Ag Process for producing a steel molding having a predominantly ferritic-bainitic structure
JP4837712B2 (en) * 2008-09-18 2011-12-14 新日本製鐵株式会社 Hot press molding method, molded products and automotive parts
US20110236719A1 (en) * 2008-12-19 2011-09-29 Tata Steel Ijmuiden Bv Method for Manufacturing a Coated Part Using Hot Forming Techniques
KR101008042B1 (en) 2009-01-09 2011-01-13 주식회사 포스코 Aluminum Coated Steel Sheet with Excellent Corrosion Resistance and Hot Press Formed Article Using The Same and Manufacturing Method Thereof
WO2010085983A1 (en) * 2009-02-02 2010-08-05 Arcelormittal Investigacion Y Desarrollo S.L. Fabrication process of coated stamped parts and parts prepared from the same
DE102009007909A1 (en) 2009-02-06 2010-08-12 Thyssenkrupp Steel Europe Ag A method of producing a steel component by thermoforming and by hot working steel component
DE102009016027A1 (en) 2009-04-02 2010-10-07 Volkswagen Ag Method for producing a component, in particular a body part, and production line for carrying out the method
DE102009042026A1 (en) 2009-09-17 2011-03-24 Volkswagen Ag Process for pretreating and providing a sheet metal part
JP4849186B2 (en) 2009-10-28 2012-01-11 Ｊｆｅスチール株式会社 Hot pressed member and method for manufacturing the same
WO2011081392A2 (en) 2009-12-29 2011-07-07 주식회사 포스코 Zinc-plated steel sheet for hot pressing having outstanding surface characteristics, hot-pressed moulded parts obtained using the same, and a production method for the same
KR101798257B1 (en) 2010-02-19 2017-11-15 타타 스틸 네덜란드 테크날러지 베.뷔. Strip, sheet or blank suitable for hot forming and process for the production thereof
WO2011104443A1 (en) 2010-02-24 2011-09-01 Arcelormittal Investigación Y Desarrollo Sl Method for making a part from a metal sheet coated with aluminium or an aluminium alloy
MX2012010102A (en) * 2010-03-08 2012-11-21 Chuo Hatsujo Kk Solid stabilizer, steel material for solid stabilizer and method for producing solid stabilizer.
KR101253885B1 (en) 2010-12-27 2013-04-16 주식회사 포스코 Steel sheet fir formed member, formed member having excellent ductility and method for manufacturing the same
KR20130132623A (en) 2011-04-01 2013-12-04 신닛테츠스미킨 카부시키카이샤 Hot stamp-molded high-strength component having excellent corrosion resistance after coating, and method for manufacturing same
DE202011107125U1 (en) 2011-04-13 2011-11-30 Tata Steel Ijmuiden Bv Thermoformable strip, sheet or blank and thermoformed product
CN102181790B (en) * 2011-05-09 2013-04-03 武汉钢铁(集团)公司 Steel with 1,300MPa-level tensile strength for automobile safety piece and production method thereof
WO2012153008A1 (en) 2011-05-12 2012-11-15 Arcelormittal Investigación Y Desarrollo Sl Method for the production of very-high-strength martensitic steel and sheet or part thus obtained
EP2718027A1 (en) 2011-06-07 2014-04-16 Tata Steel IJmuiden BV Hot formable strip, sheet or blank, process for the production thereof, method for hot forming a product and hot formed product
US9314997B2 (en) 2011-06-28 2016-04-19 Posco Plated steel sheet having plated layer with excellent stability for hot press molding
WO2013014481A1 (en) 2011-07-26 2013-01-31 Arcelormittal Investigación Y Desarrollo Sl Hot-formed previously welded steel part with very high mechanical resistance, and production method
US9677145B2 (en) * 2011-08-12 2017-06-13 GM Global Technology Operations LLC Pre-diffused Al—Si coatings for use in rapid induction heating of press-hardened steel
KR101382981B1 (en) 2011-11-07 2014-04-09 주식회사 포스코 Steel sheet for warm press forming, warm press formed parts and method for manufacturing thereof
KR20140119738A (en) 2012-02-14 2014-10-10 신닛테츠스미킨 카부시키카이샤 Plated steel plate for hot pressing and hot pressing method of plated steel plate
DE102012006941B4 (en) * 2012-03-30 2013-10-17 Salzgitter Flachstahl Gmbh Method for producing a steel component by hot forming
MX369572B (en) 2012-04-18 2019-11-13 Nippon Steel Corp Star Al-plated steel sheet, method for hot-pressing al-plated steel sheet, and automotive part.
WO2013177590A1 (en) 2012-05-25 2013-11-28 Shiloh Industries, Inc. Sheet metal piece having weld notch and method of forming the same
WO2014005041A1 (en) 2012-06-29 2014-01-03 Shiloh Industries, Inc. Welded blank assembly and method
WO2014009004A1 (en) 2012-07-10 2014-01-16 Tata Steel Nederland Technology B.V. Coated hot-formable steel strip, sheet or blank and method for making the same
WO2014037627A1 (en) 2012-09-06 2014-03-13 Arcelormittal Investigación Y Desarrollo Sl Process for manufacturing press-hardened coated steel parts and precoated sheets allowing these parts to be manufactured
KR20180034706A (en) 2012-11-30 2018-04-04 쉴로 인더스트리즈 인코포레이티드 Method of forming a weld notch in a sheet metal piece
KR101860776B1 (en) 2013-03-14 2018-05-25 쉴로 인더스트리즈 인코포레이티드 Welded blank assembly and method
PT2984198T (en) 2013-04-10 2021-09-22 Tata Steel Ijmuiden Bv Product formed by hot forming of metallic coated steel sheet, method to form the product, and steel strip
KR102015200B1 (en) 2013-04-18 2019-08-27 닛폰세이테츠 가부시키가이샤 Plated steel sheet for hot pressing, process for hot-pressing plated steel sheet and automobile part
KR101482395B1 (en) 2013-04-19 2015-01-13 주식회사 포스코 Hot-press forming apparatus of coated steel and hot-press forming process using the same
KR101772308B1 (en) 2013-06-11 2017-08-28 신닛테츠스미킨 카부시키카이샤 Hot-stamped product and process for producing hot-stamped product
EP2851440A1 (en) * 2013-09-19 2015-03-25 Tata Steel IJmuiden BV Steel for hot forming
CN103572160A (en) * 2013-11-04 2014-02-12 顾建 Material of high mechanical strength part
CN103572161A (en) * 2013-11-04 2014-02-12 顾建 Material of high mechanical strength part and manufacturing method
KR101762555B1 (en) 2013-12-12 2017-07-27 신닛테츠스미킨 카부시키카이샤 Al-plated steel sheet for hot pressing and process for manufacturing al-plated steel sheet for hot pressing
KR101528067B1 (en) 2013-12-20 2015-06-10 주식회사 포스코 Steel for hot press forming with excellent formability and weldability, and mmehtod for manufacturing thereof
JP6376140B2 (en) 2013-12-25 2018-08-22 新日鐵住金株式会社 Automobile parts and method of manufacturing auto parts
KR101585736B1 (en) 2013-12-25 2016-01-15 주식회사 포스코 Steel sheet for hot press forming having high microcracking resistance and corrosion property and hot press formed article using the same and method for manufacturing the same
KR101568549B1 (en) 2013-12-25 2015-11-11 주식회사 포스코 Steel sheet for hot press formed product having high bendability and ultra high strength, hot press formed product using the same and method for manufacturing the same
US20180105892A9 (en) * 2014-02-05 2018-04-19 Farid Eddin Hassani Hot formable, air hardenable, weldable, steel sheet
WO2015150848A1 (en) 2014-03-31 2015-10-08 Arcelormittal Investigación Y Desarrollo Sl Method of producing press-hardened and -coated steel parts at a high productivity rate
WO2015162445A1 (en) 2014-04-25 2015-10-29 Arcelormittal Investigación Y Desarrollo Sl Method and device for preparing aluminium-coated steel sheets intended for being welded and then hardened under a press; corresponding welded blank
EP2944706B1 (en) 2014-05-12 2019-09-11 ThyssenKrupp Steel Europe AG Method for manufacturing a steel component by means of thermoforming from a steel sheet having a metallic coating
WO2016016676A1 (en) 2014-07-30 2016-02-04 ArcelorMittal Investigación y Desarrollo, S.L. Process for manufacturing steel sheets, for press hardening, and parts obtained by means of this process
PL2993248T3 (en) 2014-09-05 2020-11-30 Thyssenkrupp Steel Europe Ag Flat steel product with an Al coating, method for producing the same, and method for producing a hot-formed steel component
HUE042774T2 (en) * 2014-09-22 2019-07-29 Arcelormittal Methods for producing a three-dimensional vehicle door frame inner reinforcement element, for producing a vehicle door frame and for producing a vehicle reinforcement structure
KR101630991B1 (en) 2014-12-23 2016-06-16 주식회사 포스코 Steel for warm press forming with excellent formability and weldability, forming part, and method for manufacturing thereof
KR101665820B1 (en) 2014-12-24 2016-10-25 주식회사 포스코 Steel having excellent corrosion resistance and forming part by using the same and manufacturing method thereof
KR101569505B1 (en) 2014-12-24 2015-11-30 주식회사 포스코 Hot press formed article having good anti-delamination, and method for the same
KR101696052B1 (en) 2014-12-24 2017-01-13 주식회사 포스코 Forming part having excellent corrosion resistance and manufacturing method thereof
KR101569509B1 (en) 2014-12-24 2015-11-17 주식회사 포스코 Hot press formed parts having less galling in the coating during press forming, and method for the same
KR101569508B1 (en) * 2014-12-24 2015-11-17 주식회사 포스코 Hot press formed parts having excellent bendability, and method for the same
WO2016130548A1 (en) 2015-02-10 2016-08-18 Arcanum Alloy Design, Inc. Methods and systems for slurry coating
WO2017006144A1 (en) 2015-07-09 2017-01-12 Arcelormittal Steel for press hardening and press hardened part manufactured from such steel
KR101677398B1 (en) 2015-11-30 2016-11-18 주식회사 포스코 Steels for hot forming and method of manufacturion component using thereof
DE102015225662A1 (en) 2015-12-17 2017-06-22 Volkswagen Aktiengesellschaft Process for preparatory treatment and hot working of a steel component
KR101696121B1 (en) 2015-12-23 2017-01-13 주식회사 포스코 Al-Fe coated steel sheet having good hydrogen delayed fracture resistance property, anti-delamination property and spot weldability, and HPF parts obtained therefrom
KR101726094B1 (en) 2015-12-24 2017-04-12 주식회사 포스코 Hot pressed part with reduced microcrack and method for manufacturing same
DE102016000177A1 (en) 2016-01-13 2017-07-13 Klaus-Dieter Horn Steel strip of boron-alloyed tempering steel with high nitrogen content
WO2017144419A1 (en) 2016-02-23 2017-08-31 Tata Steel Ijmuiden B.V. Hot formed part and method for producing it
WO2017201418A1 (en) 2016-05-20 2017-11-23 Arcanum Alloys, Inc. Methods and systems for coating a steel substrate
KR101819345B1 (en) 2016-07-07 2018-01-17 주식회사 포스코 Hot press formed member having excellent crack arrest property and ductility and method for manufacturing thereof
KR101830527B1 (en) 2016-09-26 2018-02-21 주식회사 포스코 Cold rolled steel sheet for hot press forming and hot presse forming part having excellent corrosion property and spot weldability, and manufacturing method thereof
DE102016219278A1 (en) 2016-10-05 2018-04-05 Bayerische Motoren Werke Aktiengesellschaft Process for producing a high-strength tube part
DE102016222993A1 (en) 2016-11-22 2018-05-24 Volkswagen Aktiengesellschaft Process for producing a coated steel component
KR101881893B1 (en) 2016-12-09 2018-07-26 주식회사 엠에스 오토텍 Mefhod for manufacturing hot formed parts
WO2018115914A1 (en) 2016-12-19 2018-06-28 Arcelormittal A manufacturing process of hot press formed aluminized steel parts
KR101879104B1 (en) 2016-12-23 2018-07-16 주식회사 포스코 Al-Fe ALLOY PLATED STEEL SHEET FOR HOT PRESS FORMING HAVING EXCELLENT TAILOR-WELDED-BLANK WELDING PROPERTY, HOT PRESS FORMED PART, AND METHOD OF MANUFACTURING THE SAME
KR101858868B1 (en) * 2016-12-23 2018-05-16 주식회사 포스코 Plated steel sheets for hot press forming having excellent impact toughness, hot press formed parts, and methods of manufacturing the same
KR102297297B1 (en) 2016-12-23 2021-09-03 주식회사 포스코 Aluminium based coated steel having excellent corrosion reistance, aluminium alloyed coated steel by using the steel, and method for manufacturing thereof
BR112019013257A2 (en) 2016-12-28 2019-12-24 Nippon Steel Corp hot-dip galvanized steel sheet, method of manufacture hot-dip galvanized steel sheet, method of manufacture hot-stamped component and vehicle manufacturing method
KR102017103B1 (en) 2017-02-17 2019-09-03 주식회사 엠에스 오토텍 Method for manufacturing hot-stamped parts
PT3589771T (en) 2017-02-28 2023-05-09 Tata Steel Ijmuiden Bv Method for producing a steel strip with an aluminium alloy coating layer
EP3608442A4 (en) 2017-03-27 2020-09-09 Nippon Steel Corporation Al-based plated steel sheet
KR20190113873A (en) 2017-03-27 2019-10-08 닛폰세이테츠 가부시키가이샤 Al-based galvanized steel
KR101988724B1 (en) 2017-06-01 2019-06-12 주식회사 포스코 Steel sheet for hot press formed member having excellent coating adhesion and manufacturing method for the same
WO2018221989A1 (en) 2017-06-01 2018-12-06 주식회사 포스코 Steel sheet for hot press formed member having excellent resistance to hydrogen delayed fracture, and method for manufacturing same
WO2018221991A1 (en) 2017-06-01 2018-12-06 주식회사 포스코 Steel sheet for hot press formed member having excellent plating adhesion, and method for manufacturing same
WO2018221992A1 (en) 2017-06-01 2018-12-06 주식회사 포스코 Steel sheet for hot press formed member having excellent painting adhesion and post-painting corrosion resistance, and method for manufacturing same
WO2018220430A1 (en) 2017-06-02 2018-12-06 Arcelormittal Steel sheet for manufacturing press hardened parts, press hardened part having a combination of high strength and crash ductility, and manufacturing methods thereof
DE102017210201A1 (en) 2017-06-19 2018-12-20 Thyssenkrupp Ag Process for producing a steel component provided with a metallic, corrosion-protective coating
DE102017211753A1 (en) 2017-07-10 2019-01-10 Thyssenkrupp Ag Method for producing a press-hardened component
KR101952818B1 (en) 2017-09-25 2019-02-28 주식회사포스코 Low alloy steel sheet with high strength and ductility and method of manufacturing same
MX2020003891A (en) 2017-09-28 2020-08-20 Nippon Steel Corp Plated steel sheet, plated steel sheet coil, method for producing hot pressed article, and automobile component.
DE102017218704A1 (en) 2017-10-19 2019-04-25 Thyssenkrupp Ag Process for producing a steel component provided with a metallic, corrosion-protective coating
JP6406475B1 (en) 2017-11-20 2018-10-17 新日鐵住金株式会社 Al-plated welded pipe for quenching, Al-plated hollow member and method for producing the same
KR102031464B1 (en) 2017-12-26 2019-10-11 주식회사 포스코 Coated steel sheet for hot press forming, hot press formed part using the sheet, and method for manufacturing thereof
KR102153164B1 (en) 2017-12-26 2020-09-07 주식회사 포스코 Plated steel for hot press forming and forming part by using the same
WO2019171157A1 (en) 2018-03-09 2019-09-12 Arcelormittal A manufacturing process of press hardened parts with high productivity
CN111868290B (en) 2018-03-20 2022-05-31 日本制铁株式会社 Hot stamp-molded body
CN111868291B (en) 2018-03-20 2022-06-28 日本制铁株式会社 Hot stamping forming body
US11613789B2 (en) 2018-05-24 2023-03-28 GM Global Technology Operations LLC Method for improving both strength and ductility of a press-hardening steel
MX2020012957A (en) 2018-05-31 2021-02-16 Posco Al-fe-alloy plated steel sheet for hot forming, having excellent twb welding characteristics, hot forming member, and manufacturing methods therefor.
CN112534078A (en) 2018-06-19 2021-03-19 通用汽车环球科技运作有限责任公司 Low density press hardened steel with enhanced mechanical properties
WO2020002285A1 (en) 2018-06-26 2020-01-02 Tata Steel Nederland Technology B.V. Cold-rolled martensite steel with high strength and high bendability and method of producing thereof
CN111197145B (en) 2018-11-16 2021-12-28 通用汽车环球科技运作有限责任公司 Steel alloy workpiece and method for producing a press-hardened steel alloy part
MX2021006199A (en) 2018-11-30 2021-07-16 Posco Iron-aluminum-based plated steel sheet for hot press forming, having excellent hydrogen delayed fracture properties and spot welding properties, and manufacturing method therefor.
KR102227111B1 (en) 2018-11-30 2021-03-12 주식회사 포스코 Hot press formed part, and manufacturing method thereof
EP3889314A4 (en) 2018-11-30 2021-11-10 Posco Steel sheet plated with al-fe alloy for hot press forming having excellent corrosion resistance and heat resistance, hot press formed part, and manufacturing method therefor
US11529795B2 (en) 2018-11-30 2022-12-20 Posco Holdings Inc. Steel sheet plated with Al—Fe for hot press forming having excellent corrosion resistance and spot weldability, and manufacturing method thereof
MX2021006197A (en) 2018-11-30 2021-08-16 Posco Steel sheet plated with al-fe alloy for hot press forming having excellent corrosion resistance and heat resistance, hot press formed part, and manufacturing method therefor.
KR102378275B1 (en) 2018-11-30 2022-03-24 주식회사 포스코 Method for manufacturing aluminum coated steel sheet for hot press forming and method therefor
MX2021006196A (en) 2018-11-30 2021-07-16 Posco Aluminum-based plated steel plate for hot press having excellent resistance against hydrogen delayed fracture and spot weldability, and method for manufacturing same.
KR102180811B1 (en) 2018-12-03 2020-11-20 주식회사 포스코 A hot press formed part having excellent resistance against hydrogen embrittlement, and manufacturing method thereof
CN112955572B (en) 2018-12-18 2023-02-17 安赛乐米塔尔公司 Press hardened part with high delayed fracture resistance and method for manufacturing same
KR102165223B1 (en) 2018-12-19 2020-10-13 주식회사 포스코 Plated steel sheets for hot press forming having excellent impact toughness after hot press forming, hot press formed parts, and manufacturing methods thereof
US11530469B2 (en) 2019-07-02 2022-12-20 GM Global Technology Operations LLC Press hardened steel with surface layered homogenous oxide after hot forming
KR102279900B1 (en) 2019-09-03 2021-07-22 주식회사 포스코 Steel plate for hot forming, hot-formed member and method of manufacturing thereof
DE102019128238A1 (en) 2019-10-18 2021-04-22 Thyssenkrupp Steel Europe Ag Method for producing a flat steel product and method for producing a component therefrom
KR102326111B1 (en) 2019-12-20 2021-11-16 주식회사 포스코 Steel sheet pated with al-fe for hot press forming having excellent wear resistance of mold and manufacturing method thereof
EP4079913A4 (en) 2019-12-20 2023-02-22 Posco Steel for hot forming, hot-formed member, and manufacturing methods therefor
KR102379443B1 (en) 2019-12-20 2022-03-29 주식회사 포스코 Steel material for hot press forming, hot pressed member and manufacturing method theerof
WO2021130524A1 (en) 2019-12-24 2021-07-01 Arcelormittal Pre-coated steel sheet comprising an additional coating for increasing the mechanical strength of the weld metal zone of a welded steel part prepared from said pre-coated sheet
CN113025876A (en) 2019-12-24 2021-06-25 通用汽车环球科技运作有限责任公司 High performance press hardened steel component
KR20220151700A (en) 2020-04-20 2022-11-15 닛폰세이테츠 가부시키가이샤 Manufacturing method of hot press molded article and hot press molded article
KR102330812B1 (en) 2020-06-30 2021-11-24 현대제철 주식회사 Steel sheet for hot press and manufacturing method thereof
CN115885052A (en) 2020-08-19 2023-03-31 蒂森克虏伯钢铁欧洲股份公司 Method for producing a flat steel product with an aluminum-based corrosion protection coating and flat steel product with an aluminum-based corrosion protection coating
KR20220062962A (en) 2020-11-09 2022-05-17 주식회사 포스코 Plated steel sheets for hot press forming having excellent hydrogen brittleness resistance and impact resistance, hot press formed parts, and manufacturing methods thereof
WO2022131862A1 (en) 2020-12-18 2022-06-23 주식회사 포스코 Method for manufacturing tailor welded blank using steel sheet for hot pressing having al-fe-based intermetallic alloy layer
KR20220088232A (en) 2020-12-18 2022-06-27 주식회사 포스코 Plated steel sheets for hot press forming having excellent hydrogen brittleness resistance and impact resistance, hot press formed parts, and manufacturing methods thereof
KR102501440B1 (en) 2020-12-21 2023-02-20 주식회사 포스코 Plated steel sheet for hot press forming having excellent surface property and method for manufacturing the same
KR102412116B1 (en) 2020-12-31 2022-06-23 현대제철 주식회사 Hot stamping component and manufacturing method thereof
WO2022158062A1 (en) 2021-01-22 2022-07-28 Ｊｆｅスチール株式会社 Hot pressing member, coating member, steel sheet for hot pressing, method for manufacturing hot pressing member, and method for manufacturing coating member
CN116848273A (en) 2021-01-22 2023-10-03 杰富意钢铁株式会社 Hot-pressed member, coated member, steel sheet for hot pressing, method for producing hot-pressed member, and method for producing coated member
KR20220158157A (en) 2021-05-21 2022-11-30 주식회사 포스코 Plated steel shhet for hot press forming having excellent hydrogen embrittlement resistance, hot press formed parts, and manufacturing methods thereof
EP4092141A1 (en) 2021-05-21 2022-11-23 ThyssenKrupp Steel Europe AG Flat steel product with an al coating, method for producing the same, steel component and method for producing the same
KR102524096B1 (en) 2021-07-30 2023-04-20 현대제철 주식회사 Steel sheet for hot press and Hot stamping component manufactured using the same
KR20230021319A (en) 2021-08-05 2023-02-14 주식회사 포스코 Tailor welded blanks, hot press formed part and manufacturing method for thereof
KR20230028618A (en) 2021-08-19 2023-03-02 주식회사 포스코 Steel material for hot forming, hot formed part, and mehod for manufacturing thereof
KR20230037994A (en) 2021-09-10 2023-03-17 현대제철 주식회사 Coated steel sheet, method for manufacturing the same, and hot stamping component
KR102530077B1 (en) 2021-10-06 2023-05-08 현대제철 주식회사 Steel sheet for hot press and Hot stamping component manufactured using the same
KR102589282B1 (en) 2021-12-14 2023-10-13 현대제철 주식회사 Steel sheet for hot press and Hot stamping component manufactured using the same
WO2023120985A1 (en) 2021-12-22 2023-06-29 주식회사 포스코 Steel material for hot forming, hot formed part, and method for manufacturing thereof
KR20230096381A (en) 2021-12-23 2023-06-30 주식회사 포스코 A plated steel sheet having superior paint adhesion and corrosion resistance after hot press forming, a method for producing the same and a hot press formed member
JPWO2023153099A1 (en) 2022-02-08 2023-08-17
WO2023202765A1 (en) 2022-04-20 2023-10-26 Thyssenkrupp Steel Europe Ag Flat steel product having an al coating, method for the production thereof, steel component, and method for production thereof
WO2023222442A1 (en) 2022-05-19 2023-11-23 Tata Steel Ijmuiden B.V. Method for connecting a hot formed steel article to a steel object
EP4283003A1 (en) 2022-05-24 2023-11-29 ThyssenKrupp Steel Europe AG Method for producing a sheet metal part
KR20230166778A (en) 2022-05-31 2023-12-07 현대제철 주식회사 Hot stamping component and method of manufacturing the same
CN115475832A (en) * 2022-10-11 2022-12-16 东北大学 Production process for improving bending property of Al-Si coating hot forming steel through cold rolling
KR20240061422A (en) 2022-10-31 2024-05-08 현대제철 주식회사 Hot stamping component and method of manufacturing the same
KR20240081145A (en) 2022-11-30 2024-06-07 현대제철 주식회사 Steel sheet for hot stamping, hot stamping component and method of manufacturing the same
KR20240098874A (en) 2022-12-21 2024-06-28 주식회사 포스코 Hot press formed part having excellent adhessive property, and method for manufacturing the same
KR20240099046A (en) 2022-12-21 2024-06-28 주식회사 포스코 Aluminium based plated steel sheet and method for manufacturing the same
KR20240098840A (en) 2022-12-21 2024-06-28 주식회사 포스코 Hot formed part having excellent hydrogen brittleness resistance and method for manufacturing the same
KR20240098870A (en) 2022-12-21 2024-06-28 주식회사 포스코 Aluminum based plated steel sheet having excellent roll pollution resistance, hot press formed part using the same and method for manufacturing thereof
KR20240098869A (en) 2022-12-21 2024-06-28 주식회사 포스코 Cold rolled steel sheet for hot press forming and hot presse forming part having excellent surface quality and manufacturing method thereof
WO2024033722A1 (en) 2023-06-30 2024-02-15 Arcelormittal Crack-containing hot-stamped steel part with a thin coating with excellent spot-weldability and excellent painting adhesion
WO2024033721A1 (en) 2023-06-30 2024-02-15 Arcelormittal Crack-containing hot-stamped coated steel part with excellent spot-weldability and excellent painting adhesion

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1297906A (en) 1961-05-26 1962-07-06 Hot forging process for steel products and new industrial product obtained by this process
CH382512A (en) 1959-04-09 1964-09-30 Felten & Guilleaume Carlswerk Process for the production of high-strength aluminized steel wires
DE1252034B (en) 1967-10-12 Societe des Acieries de Pompey, Pompey, Meurthe-et-Moselle (Frankreich) Coating iron or steel with an iron-aluminum alloy coating for hot working
US4655852A (en) 1984-11-19 1987-04-07 Rallis Anthony T Method of making aluminized strengthened steel
FR2625227A1 (en) 1987-12-23 1989-06-30 Intraviss Sn Alloy steel for nuts and bolts with checking of tightening using ultrasound
US4891274A (en) * 1986-02-13 1990-01-02 Nippon Steel Corporation Hot-dip aluminum coated steel sheet having excellent corrosion resistance and heat resistance
SU1555374A1 (en) 1987-11-19 1990-04-07 Фрунзенский политехнический институт Method of manufacturing aluminium-coated steel strip
US5133815A (en) * 1990-03-02 1992-07-28 Kabushiki Kaisha Kobe Seiko Sho Cold-rolled steel sheets or hot-dip galvanized cold-rolled steel sheets for deep drawing
US5178688A (en) 1991-11-30 1993-01-12 Samsung Heavy Industries Co., Ltd. Carburized boron steels for gears
JPH0925551A (en) * 1995-05-10 1997-01-28 Nkk Corp Aluminum-zinc alloy plated steel sheet excellent in press formability and heat resistance
JPH09195021A (en) * 1996-01-18 1997-07-29 Nippon Steel Corp Production of hot-dip aluminum plated steel sheet excellent in heating blackening resistance
US5656102A (en) * 1996-02-27 1997-08-12 Bethlehem Steel Corporation Bake hardenable vanadium containing steel and method thereof

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2686755B2 (en) * 1987-12-29 1997-12-08 愛知製鋼 株式会社 High-strength steel with excellent fatigue strength
JPH0762212B2 (en) * 1988-12-09 1995-07-05 住友金属工業株式会社 High carbon thin steel sheet with high toughness and heat crack resistance
JPH04107217A (en) * 1990-08-24 1992-04-08 Kobe Steel Ltd Production of hot rolled and surface treated steel sheet having high tensile strength
JPH05247588A (en) * 1992-03-06 1993-09-24 Nippon Steel Corp Cr-based ultrahigh tensile strength resistance welded steel tube excellent in ductility
JPH06179944A (en) * 1992-12-15 1994-06-28 Nippon Steel Corp Cr series ultrahigh tensile strength electric resistance welded steel tube excellent in ductility
JP3464289B2 (en) * 1994-10-03 2003-11-05 日新製鋼株式会社 Method for producing hot-dip Zn-Al alloy-plated steel sheet for fire-resistant structure with excellent corrosion resistance

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1252034B (en) 1967-10-12 Societe des Acieries de Pompey, Pompey, Meurthe-et-Moselle (Frankreich) Coating iron or steel with an iron-aluminum alloy coating for hot working
CH382512A (en) 1959-04-09 1964-09-30 Felten & Guilleaume Carlswerk Process for the production of high-strength aluminized steel wires
FR1297906A (en) 1961-05-26 1962-07-06 Hot forging process for steel products and new industrial product obtained by this process
US4655852A (en) 1984-11-19 1987-04-07 Rallis Anthony T Method of making aluminized strengthened steel
US4891274A (en) * 1986-02-13 1990-01-02 Nippon Steel Corporation Hot-dip aluminum coated steel sheet having excellent corrosion resistance and heat resistance
SU1555374A1 (en) 1987-11-19 1990-04-07 Фрунзенский политехнический институт Method of manufacturing aluminium-coated steel strip
FR2625227A1 (en) 1987-12-23 1989-06-30 Intraviss Sn Alloy steel for nuts and bolts with checking of tightening using ultrasound
US5133815A (en) * 1990-03-02 1992-07-28 Kabushiki Kaisha Kobe Seiko Sho Cold-rolled steel sheets or hot-dip galvanized cold-rolled steel sheets for deep drawing
US5178688A (en) 1991-11-30 1993-01-12 Samsung Heavy Industries Co., Ltd. Carburized boron steels for gears
JPH0925551A (en) * 1995-05-10 1997-01-28 Nkk Corp Aluminum-zinc alloy plated steel sheet excellent in press formability and heat resistance
JPH09195021A (en) * 1996-01-18 1997-07-29 Nippon Steel Corp Production of hot-dip aluminum plated steel sheet excellent in heating blackening resistance
US5656102A (en) * 1996-02-27 1997-08-12 Bethlehem Steel Corporation Bake hardenable vanadium containing steel and method thereof

Non-Patent Citations (19)

* Cited by examiner, † Cited by third party
Title
"AK Steel Judgment", In The united States District Court For the District of Deleware, Case No. 1:10-cv-00050-SLR, Document #299, Filed Oct. 31, 2013, p. 1 of 1.
"Arcelor Memorandum Opinion", In The United States District Court For the District of Deleware, Case No. 1:10-cv-00050-SLR, Document #297, Filed Oct. 25, 2013, 12 pages.
"Arcelor Order", In The United States District Court For the District of Deleware, Case No. 1:10-cv-00050-SLR, Document #298, Filed Oct. 25, 2013, p. 1 of 1.
"ArcelorMittal Brief Motion to Clarify Judgment", In The United States District Court For the District of Deleware, Case No. 1:10-cv-00050-SLR, Document #303, Filed Nov. 6, 2013, 13 pages.
"ArcelorMittal Motion to Clarify Judgment", In The United States Disctrict Court For the District of Deleware, Case No. 1:10-cv-00050-SLR, Document #302, Filed Nov. 6, 2013, 2 pages.
"Defendant's Opposition to Plaintiff's Renewed Motion for Judgment as a Matter of Law", In The United States District Court for the District of Delaware, Case No. 1:10-cv-00050SLR, Document #236, Filed Mar. 10, 2011, 28 pages.
"Final Jury Instructions", In The United States District Court for the District of Delaware, Case No. 1:10-cv-00050SLR, Document #212, Filed Jan. 14, 2011, 44 pages.
"Jury Verdict Sheer", In The United States District Court for the District of Delaware, Case No. 1:10-cv-00050SLR, Document #215, Filed Jan. 14, 2011, 7 pages.
"Plaintiffs Opening Brief in Support of Renewed Motion for Judgment as a Matter of Law", In The United States District Court for the District of Delaware, Case No. 1:10-cv-00050SLR, Document #227, Filed Feb. 17, 2011, 29 pages.
"Plaintiffs Reply Brief in Support of Renewed Motion for Judgment as a Matter of Law", In The United States District Court for the District of Delaware, Case No. 1:10-cv-00050SLR, Document #239, Filed Mar. 24, 2011, 17 pages.
Arcelor Mittal v. AK Steel Corp, Decision by the United States Court of Appeals for the Federal Circuit for an appeal from the United States District Court for the District of Delaware in Case No. 10-CV-0050, 2011-1638, Decided Nov. 30, 2012, 25 pages.
Bano et al, "Heat Treated Boron Steels in the Automotive Industry", 39th MWSP Conference Proceedings, ISS, vol. XXXV, 1998, 673-677.
English Translation for Foreign Patent FR 1297906, May 28, 1962, 6 pages.
Ford Engineering Material Specification, "Steel, Sheet, Boron Treated, High Strength", Specification No. WSB-M1A322-A1, 1992, 3 pages.
Gierek, "Tauchalitieren-Eigenschaften und Einsatzgebiete", XP-002114744, 1976, 4 pages.
Patent Abstracts of Japan; vol. 13, No. 457; Oct. 16, 1989; & JP 01 176056; Jul. 12, 1989.
Patent Abstracts of Japan; vol. 15, No. 17; Jan. 14, 1991; & JP 02 263954; Oct. 26, 1990.
Patent Abstracts of Japan; vol. 18, No. 004; Jan. 6, 1994; & JP 05 247588; Sep. 24, 1993.
Patent Abstracts of Japan; vol. 18, No. 523; Oct. 4, 1994; & JP 06 179944; Jun. 28, 1994.

Also Published As

Publication number Publication date
PT971044E (en) 2003-08-29
DE69907816T2 (en) 2004-03-11
CA2276911C (en) 2009-05-05
JP3931251B2 (en) 2007-06-13
EP0971044B1 (en) 2003-05-14
US6296805B1 (en) 2001-10-02
DK0971044T3 (en) 2003-08-11
ES2196740T3 (en) 2003-12-16
EP0971044A1 (en) 2000-01-12
ATE240419T1 (en) 2003-05-15
BR9902712A (en) 2000-03-08
USRE44153E1 (en) 2013-04-16
FR2780984B1 (en) 2001-06-22
JP2000038640A (en) 2000-02-08
CA2276911A1 (en) 2000-01-09
DE69907816D1 (en) 2003-06-18
FR2780984A1 (en) 2000-01-14

Similar Documents

Publication Publication Date Title
USRE44940E1 (en) Coated hot- and cold-rolled steel sheet comprising a very high resistance after thermal treatment
US12012640B2 (en) Method of forming a hot stamped coated steel product
CN112154224B (en) Hot stamping forming member, precoated steel sheet for hot stamping forming, and hot stamping forming process
JP6580123B2 (en) Method for producing press-hardening steel sheet and parts obtained by the method
JP7269588B2 (en) Steels used for hot stamping, hot stamping methods and formed components
US8066829B2 (en) Process for manufacturing stamped products, and stamped products prepared from the same
JP5586008B2 (en) Thermomechanical molding method of final product with very high strength and product produced by the method
EP2690191B1 (en) A method of production of high strength thin-gauge steel sheet excellent in elongation and hole expandability
CN109371325A (en) A kind of electrogalvanized thermoforming steel plate that cold-bending property is excellent or steel band and its manufacturing method
EP2371979A1 (en) High-strength cold-rolled steel sheet having excellent workability, molten galvanized high-strength steel sheet, and method for producing the same
CN101316942A (en) Steel sheet for hot press forming having excellent heat treatment and impact property, hot press parts made of it and the method for manufacturing thereof
KR20130006461A (en) Method for producing workpieces from lightweight steel having material properties that can be adjusted over the wall thickness
JP4384523B2 (en) Low yield ratio type high-strength cold-rolled steel sheet with excellent shape freezing property and manufacturing method thereof
MX2007010902A (en) Method for making a coated steel part having very high resistance after heat treatment.
JP3447233B2 (en) Method for producing thin steel sheet and high-strength pressed body excellent in heat-hardening ability
JP2001316767A (en) Hot rolled steel having extremely high elastic limit and mechanical strength and particularly useful for production of automotive parts
JP2004124123A (en) Low yield ratio type high strength cold rolled steel sheet having excellent workability and shape fixability, and production method therefor
JPH04371518A (en) Production of ferritic stainless steel for electric material having excellent ductility, wear resistance and rust resistance
JPH09310165A (en) Thin steel sheet for working excellent in fatigue characteristic and its production
JPH0372032A (en) Production of sheet steel
CN115612816B (en) Method for preparing complex phase steel and steel plating plate for thermoforming from boron-containing steel
JP2004131771A (en) Method for manufacturing cold rolled steel sheet having excellent shape fixability
JP2004131754A (en) Cold rolled steel sheet excellent in workability and shape fixability and its manufacturing method
JP2006522221A (en) Method for producing hot-rolled and cold-rolled ultra-high-strength steel sheet and resulting ultra-high-strength steel sheet
JPS627243B2 (en)

Legal Events

Date Code Title Description
AS Assignment

Owner name: ARCELORMITTAL, LUXEMBOURG

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ARCELORMITTAL FRANCE;REEL/FRAME:036044/0282

Effective date: 20141231

AS Assignment

Owner name: USINOR, FRANCE

Free format text: CORPORATE DISSOLUTION WITHOUT LIQUIDATION AND TRANSFER OF RIGHTS;ASSIGNOR:SOLLAC;REEL/FRAME:036106/0776

Effective date: 20031020

Owner name: SOLLAC, FRANCE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LAURENT, JEAN-PIERRE;HENNECHART, JEAN-PAUL;SPEHNER, DOMINIQUE;AND OTHERS;REEL/FRAME:036097/0041

Effective date: 19990723

Owner name: ARCELORMITTAL FRANCE, FRANCE

Free format text: CHANGE OF ADDRESS;ASSIGNOR:ARCELORMITTAL FRANCE;REEL/FRAME:036174/0564

Effective date: 20131016

Owner name: ARCELORMITTAL ATLANTIQUE ET LORRAINE, FRANCE

Free format text: CHANGE OF NAME;ASSIGNOR:ARCELOR ATLANTIQUE ET LORRAINE;REEL/FRAME:036107/0330

Effective date: 20071109

Owner name: ARCELORMITTAL FRANCE, FRANCE

Free format text: CHANGE OF NAME;ASSIGNOR:ARCELOR FRANCE;REEL/FRAME:036107/0298

Effective date: 20070831

Owner name: ARCELOR ATLANTIQUE ET LORRAINE, FRANCE

Free format text: PATENT CO-OWNERSHIP AGREEMENT;ASSIGNOR:ARCELOR FRANCE;REEL/FRAME:036106/0502

Effective date: 20060515

Owner name: ARCELOR FRANCE, FRANCE

Free format text: CHANGE OF NAME;ASSIGNOR:USINOR;REEL/FRAME:036097/0545

Effective date: 20060407

Owner name: USINOR, FRANCE

Free format text: MERGER;ASSIGNOR:SOLLAC;REEL/FRAME:036097/0349

Effective date: 20031221

Owner name: ARCELOR ATLANTIQUE ET LORRAINE, FRANCE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ARCELOR FRANCE;REEL/FRAME:036097/0596

Effective date: 20060515