Disclosed are a preparation method of a steel product capable of local reinforcement using laser heat treatment, and a heat hardened steel used in the method. According to the present invention, the preparation method of a steel part comprises the following steps: (a) preparing a material comprising 0.1-0.5 wt% of C, 0.1-0.5 wt% of Si, 0.5-3.0 wt% of Mn, 0.1 wt% or less of P, 0.05 wt% or less of S, 0.01-1.0 wt% of Cr, 0.1 wt% or less of Al, 0.2 wt% or less of Ti, 0.0005-0.08 wt% of B, and the balance of Fe and inevitable impurities; (b) preparing a formed product by forming the material into a predetermined shape; and (c) locally reinforcing the high strength portion by carrying out laser heat treatment on a portion requiring high strength at the formed product.
C21D 1/09 - Durcissement de surface par application directe d'énergie électrique ou ondulatoireDurcissement de surface par radiation particulaire
C22C 38/38 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et plus de 1,5% en poids de manganèse
C23C 2/04 - Procédés de trempage à chaud ou d'immersion pour appliquer le matériau de revêtement à l'état fondu sans modifier la forme de l'objet immergéAppareils à cet effet caractérisé par le matériau de revêtement
2.
HEAT-HARDENED STEEL WITH EXCELLENT CRASHWORTHINESS AND METHOD FOR MANUFACTURING HEAT-HARDENABLE PARTS USING SAME
Disclosed are heat-hardened steel with excellent crashworthiness and a method for manufacturing heat-hardenable parts using the same. The heat-hardened steel according to the invention comprises, based on wt%, C: 0.12-0.8 %, Cr : 0.01-2 %, Mo: 0.2 % or less, B: 0.0005-0.08 %, Ca: 0.01 or less, Sb: 1.0 % or less, and Ti and/or Nb: 0.2 %, and the reminder being Fe and inevitable impurities. In addition, the heat-hardened steel satisfies any one of following conditions i)-iv), wherein condition i) comprises Si: 0.5-3 %, Mn: 1-10 % and Al: 0.05-2 %, condition ii) comprises Si: 1 % or less, Mn: 0.5-5 %, Al: 0.1-2.5 %, and Ni: 0.01-8 %, condition iii) comprises Si: 0.5-3 %, Mn: 1-10 %, Al: 0.1 % or less, and Ni: 0.01-8 %, and condition iv) comprises Si: 0.5-3 %, Mn: 1-10 %, Al: 0.1-2.5 %, and Ni: 0.01-8 %.
C22C 38/00 - Alliages ferreux, p. ex. aciers alliés
C21D 9/46 - Traitement thermique, p. ex. recuit, durcissement, trempe ou revenu, adapté à des objets particuliersFours à cet effet pour tôles
C22C 38/58 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et plus de 1,5% en poids de manganèse
C21D 8/00 - Modification des propriétés physiques par déformation en combinaison avec, ou suivie par, un traitement thermique
C23C 2/04 - Procédés de trempage à chaud ou d'immersion pour appliquer le matériau de revêtement à l'état fondu sans modifier la forme de l'objet immergéAppareils à cet effet caractérisé par le matériau de revêtement
3.
METHOD FOR MANUFACTURING AUTOMOBILE PART HAVING DIFFERENT LOCAL STRENGTHS USING HEAT-TREATMENT HARDENING STEEL PLATE
The present invention relates to a method for manufacturing automobile parts having different local strengths, and more specifically, to a method for manufacturing automobile parts using a heat-treatment hardened steel having different local thicknesses. The present invention provides a method for manufacturing automobile parts comprising: a blank sheet preparation step for preparing blank sheets using a heat-treatment hardening steel plate having different thicknesses, and a heat-treatment hardening steel plate having different materials, according to the strength required; a blank conjugate forming step for forming a blank conjugate by connecting the blank sheets using laser welding; a cold molding step for cold press molding the blank conjugates; and a heat-treatment hardening step for heating the cold-molded part to above AC3 temperature, then resolving mold retention stress by quenching the part when constrained in a metal mold, and enhancing the strength thereby.
C21D 8/02 - Modification des propriétés physiques par déformation en combinaison avec, ou suivie par, un traitement thermique pendant la fabrication de produits plats ou de bandes
C21D 1/00 - Procédés ou dispositifs généraux pour le traitement thermique, p. ex. recuit, durcissement, trempe ou revenu
B21D 22/00 - Mise en forme sans coupage, par estampage, repoussage ou emboutissage
The present invention relates to a separator plate for a fuel cell and to a method for producing the same, and relates to an invention wherein a surface-modification layer is formed through the use of low temperature plasma processing such that it is possible to prevent the hydrophobic characteristics which occur during gasket forming and to have outstanding hydrophilic characteristics, and such that it is possible to obtain the advantageous effect of highly outstanding corrosion resistance and electrical conductivity not only initially but also even after long-term use in a fuel-cell operating environment, and also such that it is possible to maintain outstanding durability even when using a normal low-price stainless-steel sheet base material, and it is possible to reduce the unit cost of production of the separator plate for the fuel cell since surface processing can be carried out at low cost.
H01M 8/02 - Éléments à combustibleLeur fabrication Détails
C23C 14/22 - Revêtement par évaporation sous vide, pulvérisation cathodique ou implantation d'ions du matériau composant le revêtement caractérisé par le procédé de revêtement
Provided is a method for producing a door impact beam comprising a body part having a circular cross section for ensuring strength, and an attachment part which is formed on one side or on both sides of the body part and is shaped so as to have a width of between 100 and 160% of the diameter of the body part and to have a thickness corresponding to between 5 and 40% of the diameter of the body part, wherein the method for producing the door impact beam comprises: a steel-tube preparation step in which a steel tube is produced that has a diameter corresponding to the diameter of the body part; a cutting step in which the steel tube is cut to the length of the door impact beam; a heating step in which the cut steel tube is heated to between 880 and 960°C by using the induction heating method; and a hot-moulding and rapid-cooling step in which the heated steel tube is moulded in a mould having a moulding part corresponding to the shapes of the body part and the attachment part and having a cooling channel connected to the surface of the mould, while at the same time cooling water is supplied to the cooling channel such that the mould is cooled and the cooling water is brought into contact with the surface of the moulded steel tube.
B60J 5/04 - Portes disposées sur les côtés du véhicule
B21D 53/86 - Fabrication d'autres objets particuliers d'autres parties de bicyclettes ou motocyclettes
C21D 9/08 - Traitement thermique, p. ex. recuit, durcissement, trempe ou revenu, adapté à des objets particuliersFours à cet effet pour corps tubulaires ou tuyaux
6.
HIGH-STRENGTH STEEL SHEET HAVING EXCELLENT PLATABILITY AND METHOD FOR MANUFACTURING SAME
Disclosed are a high-strength steel sheet which exhibits excellent platability and has a tensile strength of 590 MPa or more and a tensile strength-elongation balance (TS × El) of 16,250 MPa·% or more, as well as a method for manufacturing the high-strength steel sheet. The high-strength steel sheet having excellent platability according to the present invention comprises, by weight %, 0.03-0.10% of C, 0.005-0.105% of Si, 1.0-3.0% of Mn, 0.005-0.040% of P, 0.003% or less of S, 0.003-0.008% of N, 0.05-0.40% of Al, Mo or Cr satisfying the condition of 10 ≤ 50· [Mo %] + 100· [Cr %] ≤ 30, 0.005-0.020% of Ti, 0.005-0.050% of V, and/or 0.0005-0.0015% of B, with the remainder being Fe and unavoidable impurities. A microstructure of the high-strength steel sheet is a complex microstructure containing, by sectional structure area %, 70% or more of ferrite having a Vickers hardness of 120-250 HV, and 10% or more of martensite having a Vickers harness of 321-555 HV.
C22C 38/00 - Alliages ferreux, p. ex. aciers alliés
C21D 8/02 - Modification des propriétés physiques par déformation en combinaison avec, ou suivie par, un traitement thermique pendant la fabrication de produits plats ou de bandes
C22C 38/38 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et plus de 1,5% en poids de manganèse
C22C 38/22 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du molybdène ou du tungstène
7.
BUMPER LOWER STIFFENER WITH IMPROVED PERFORMANCE USING ULTRA HIGH STRENGTH STEEL PIPE AND MANUFACTURING METHOD THEREOF
The present invention relates to a bumper lower stiffener formed at the lower portion of the front bumper of a vehicle and a manufacturing method thereof. More specifically, the present invention relates to a bumper lower stiffener manufactured using a steel pipe formed by hot pressing and a manufacturing method thereof. The present invention provides a method for manufacturing the horizontal member of the bumper lower stiffener, which includes a cutting step of cutting a steel pipe added with quenching elements at a predetermined length; a heat treatment step of heating the cut steel pipe at a molding temperature; a hot pressing step of hot-pressing the heated steel pipe with press molds into the shape of the horizontal member having plane surface sections at the both sides thereof; and a cooling step of rapidly cooling the formed horizontal member in the state that the press molds are closed.
Disclosed are a twin-piping water pipe for which hydroforming is employed, and a production method therefor. According to the present invention, the production method for the twin-piping water pipe for which hydroforming is employed comprises the steps of: (a) inserting, into an outer tube formed from steel, an inner tube which is formed from a corrosion resistant material selected from stainless steel, titanium and aluminium and which has an outer diameter smaller than the inner diameter of the outer tube; (b) stably placing the outer tube in a mould and then sealing the two ends of the mould by using a sealing means having a throughhole connected to a fluid supply device for supplying a fluid to the inner tube; (c) supplying the fluid to the inner tube and thereby plastically expanding the inner tube and resiliently expanding the outer tube; and (d) discharging the fluid from the inner tube and thereby resiliently restoring the outer tube and subjecting the inner tube and the outer tube to friction coupling.
F16L 9/18 - Tuyaux à double paroiTuyaux à canaux multiples ou assemblages de tuyaux
B21D 26/02 - Mise en forme sans coupage, autrement qu'en utilisant des dispositifs ou outils rigides, des masses souples ou élastiques, p. ex. mise en forme en appliquant une pression de fluide ou des forces magnétiques en appliquant une pression de fluide
F16L 9/14 - Tubes en matériaux composites, c.-à-d. faits de matériaux non complètement couverts dans un seul des groupes précédents
9.
METAL SEPARATOR PLATE FOR FUEL CELL HAVING COATING FILM FORMED ON SURFACE AND METHOD FOR PRODUCING SAME
Provided is a method for producing a metal separator plate for a fuel cell having outstanding corrosion resistance and electrical conductivity not only initially but also even after long-term use in a fuel-cell operating environment. The method for producing a metal separator plate for a fuel cell according to the present invention comprises the steps of: preparing a stainless steel plate parent material; forming a non-continuous coating film of at least one of gold (Au), platinum (Pt), ruthenium (Ru), iridium (Ir), ruthenium oxide (RuO2) and iridium oxide (IrO2) on the surface of the stainless steel plate parent material; and subjecting the stainless steel plate, on which the non-continuous coating film has been formed, to a heat treatment and thereby forming an oxide film on the area where the coating film was not formed. Also provided is a metal separator plate for a fuel cell having a coating film formed on the surface, produced by means of the method.
Disclosed is an air-cooled metal separator which does not require cooling water. The air-cooled metal separator according to the present invention comprises: a channel part which includes reactive gas channels protruded from a front side to a back side at the center of a metal plate, and air flow passages formed between the reactive gas channels protruded to the back side; a first gasket which is continuously formed at the edge of the front side of the channel part; and a second gasket which is non-continuously formed at the edge of the back side of the channel part, wherein the non-continuous part serves as an air movement passage.
Disclosed is a gasket for a metal separator, having a dual structure which can improve the stiffness and sealing property of a foil metal separator. The gasket for a metal separator having a dual structure according to the present invention comprises a first gasket which is formed at each edge region of a channel and a manifold of a metal main body comprising the channel and the manifold by using a material such as reinforced plastics, high hardness rubber and the like and provides stiffness to the metal main body; and a second gasket which is formed on the first gasket by using a material such as rubber and the like and provides sealing properties to the channel and the manifold.
H01M 8/02 - Éléments à combustibleLeur fabrication Détails
H01M 8/04 - Dispositions auxiliaires, p. ex. pour la commande de la pression ou pour la circulation des fluides
B29C 45/00 - Moulage par injection, c.-à-d. en forçant un volume déterminé de matière à mouler par une buse d'injection dans un moule ferméAppareils à cet effet
12.
METAL SEPARATOR FOR FUEL CELL, AND FUEL CELL STACK PROVIDED WITH SAME
The present invention relates to a metal separator for a fuel cell, and a fuel cell stack provided with the same, wherein the metal separator for a fuel cell comprises: a channel portion comprising reaction gas channels which are formed at the center and are protruded from a first surface to a second surface, and a cooling water channel which is formed between reaction channels protruded at the second surface; a metal main body portion which is integrated with the channel portion at the four side edges of the channel portion and has openings which penetrate the first surface and the second surface and are formed at the two side surfaces facing each other; a polymer manifold-gasket assembly comprising a manifold portion which is formed as a divided space at the openings for the supply and discharge of a reaction gas and cooling water, and a gasket which is integrated with the manifold portion at the edge of the metal main body portion and a region required for sealing; and reaction gas inflow/outflow holes which are integrated with the manifold-gasket assembly. By the configuration, the present invention enables a smoother flow of the reaction gas and cooling water flowing through the reaction gas channels and the cooling channel, obtains stiffness of a metal separator, and improves the durability of a metal separator.
The present invention comprises: a step for preparing a mold including an outer tube, an inner tube having a diameter of 95~98% of the diameter of the outer tube, and a molding groove having a diameter of 100.20~100.30% of the diameter of the outer tube; a step for inserting the inner tube into the outer tube and settling the tubes in the molding groove; a first molding step for expanding the inner tube to bring the inner tube into contact with the outer tube by injecting fluid into the inner tube to the first molding pressure; a second molding step for elastically expanding the outer tube to bring the outer tube into contact with the inner groove by increasing the hydraulic pressure of the inner tube to the second molding pressure; and an elasticity restoring step for bonding the outer tube and inner tube by restoring the elasticity of the outer tube through the removal of the fluid injected into the inner tube. The first molding pressure of the first molding step ranges within10~20% of the yield strength of the inner tube. The second molding pressure of the second molding step ranges within 10~20% of the sum of the yield strengths of the inner and outer tubes and is maintained for 2~3 seconds.
B21D 26/02 - Mise en forme sans coupage, autrement qu'en utilisant des dispositifs ou outils rigides, des masses souples ou élastiques, p. ex. mise en forme en appliquant une pression de fluide ou des forces magnétiques en appliquant une pression de fluide
14.
METHOD FOR MANUFACTURING SUPER STRONG STEEL BODY FOR MANUFACTURE OF PRODUCTS WITH COMPLICATED SHAPE
The present invention relates to a method for manufacturing a super strong steel body, more specifically, to the method for manufacturing a super strong steel body suitable for the processing of products with complicated shapes and deep casting depths. The present invention comprises: a sheet preparation step for blanking a steel sheet with curing ability in a certain shape and cutting the steel sheet; a cold forming step for cold pressing the steel sheet and forming the steel sheet with 50~80% the thickness of the height of the end product; a trimming step for precisely cutting the cold formed product along the outline of the finished goods; and a hot forming and cooling step for simultaneously hot press forming the trimmed goods with 20~50% the thickness of the height of the end product and cooling the trimmed goods from the heated state after heating the trimmed goods over 700℃ for austenitization.
The present invention provides a metal surface treatment solution which can have excellent corrosive resistance and coating adhesion properties. The metal surface treatment solution according to the present invention comprises:9-13 wt% of an epoxy-based silane coupling agent, 5-9 wt% of an amino-based silane coupling agent, 0.5-1 wt% of a vanadium compound, 0.5-1 wt% of a phosphoric acid, 0.5-1 wt% of an organic acid, 0.1-10 wt% of Ti-alkoxide, 0.1-2 wt% of a chelating agent, 0.1-5 wt% of a calcium phosphate-based compound, 0.2-10 wt% of colloidal silica, and the remainder being a solvent. In addition, a surface treatment method of a metal steel sheet using the solution is provided.
C23C 22/00 - Traitement chimique de surface de matériaux métalliques par réaction de la surface avec un milieu réactif laissant des produits de réaction du matériau de la surface dans le revêtement, p. ex. revêtement par conversion, passivation des métaux
16.
METAL SEPARATOR PLATE FOR A FUEL CELL HAVING A COATING LAYER COMPRISING CARBON PARTICLES DISPERSED IN A BINDER RESIN, AND A PRODUCTION METHOD THEREFOR
The present invention provides a production method for a metal separator plate for a fuel cell which can maintain superior electrical conductivity and corrosion resistance without other adverse effects not just initially but even when used for an extended period of time under operating conditions involving severe vibration such as in a vehicle, which allows continuous production processing, and which allows high production efficiency. The production method for a metal separator plate for a fuel cell of the present invention is characterised in that it comprises: (a) a stage in which a base material made of a metal plate is made ready; (b) a stage in which the surface of the metal plate is subjected to acid cleaning; (c) a stage in which the surface of the acid-cleaned metal plate is coated with a composition comprising a binder resin, carbon particles and a solvent; and (d) a stage in which the metal plate, whose surface has been coated with the said composition, is dried at a temperature lower than the thermal decomposition temperature of the binder resin and higher than the boiling point of the solvent, and in which a coating layer, comprising carbon particles dispersed in a binder resin matrix, is formed on the surface of the metal plate; and these processes are carried out in a continuous process.
Disclosed herein is a stainless steel separator for a fuel cell. The stainless steel separator includes a stainless steel sheet, a fist coating layer comprising metal/metal nitride films (M/MNx) (0.5 ≤ x ≤ l) on a surface of the stainless steel sheet, and a second coating layer comprising a metal oxynitride film (MOyNz) (0.05 ≤ y≤ 2, 0.25 ≤ z ≤ 1.0). A method for manufacturing the stainless steel separator is disclosed.
A method for manufacturing a stainless separator for a fuel cell comprises (a) preparing a stainless steel sheet, (b) coating a composition comprising chromic anhydride (CrO3), carbon powders, a water-soluble binder resin, and water H2O on a surface of the stainless steel sheet, and (c) heat treating the composition-coated stainless steel sheet in a reducing gas atmosphere to form a coat on the surface of the stainless steel sheet in the form of a Cr-rich film having the carbon powders distributed in the film. The metallic separator and the method for manufacturing the same ensure corrosion resistance and electrical conductivity of the separator at the same time. Furthermore, the metallic separator exhibits excellent endurance, and, the method enables easy constitution of a manufacturing process.
A method for surface treatment of a stainless steel separator for a fuel cell comprises preparing a stainless steel sheet containing nickel, chrome and iron, and having a passive film on a surface of the stainless steel sheet, and dipping the stainless steel sheet into a mixed etching solution of nitric acid (HNO3) and sulfuric acid (H2SO4) at a temperature of 50-70 °C for 30 seconds to 30 minutes to selectively lower an amount of Fe in the passive film formed on the surface of the stainless steel sheet.
The present invention discloses a metal separator for a fuel cell including a reaction gas channel formed to protrude from a first face of the metal separator to a second face thereof, a coolant channel formed between the reaction gas channels protruding from the second face of the metal separator, a reaction gas manifold opened to introduce a reaction gas into the metal separator, a coolant manifold opened to introduce a coolant into the metal separator, and a stepped portion positioned at any one of the space between the reaction gas channel and the reaction gas manifold, and the reaction gas channel. This configuration serves to widen the reaction gas flowing portion and the coolant flowing portion on the metal separator, and prevent deformation of the reaction gas flowing portion and the coolant flowing portion, thereby improving efficiency of the fuel cell.
brevets