AUTOMOBILE PART MANUFACTURING METHOD USING QUENCHED STEEL SHEET

Disclosed herein is method of manufacturing an automobile part having different local strengths, more particularly, a method of manufacturing an automobile part using a steel sheet subjected to heat-treatment hardening and having different local thicknesses. The method includes preparing blank sheets using steel sheets subjected to heat-treatment hardening and having different thicknesses or different material properties according to desired strength; forming a blank assembly by joining the blank sheets to each other via laser welding; cold-pressing the blank assembly; and heating the cold-pressed part to a temperature of ACor more, followed by quenching the cold-formed part received within dies to remove residual stress while increasing strength of the automobile part. 19-. (canceled)10. A method of manufacturing an automobile part , comprising:preparing blank sheets using steel sheets subjected to heat-treatment hardening and having different thicknesses or different material properties according to desired strength;forming a blank assembly by joining the blank sheets to each other via laser welding;cold-pressing the blank assembly; and{'sub': '3', 'heating the cold-pressed part to a temperature of ACor more, followed by quenching the cold-pressed part received within dies to remove residual stress while increasing strength of the automobile part.'}11. A method of manufacturing an automobile part , comprising:preparing blank sheets using steel sheets subjected to heat-treatment hardening and having different thicknesses or different material properties according to desired strength;forming a blank assembly by joining the blank sheets to each other via laser welding;cold-pressing the blank assembly to an extent of 80 to 99% of a final shape of the automobile part; and{'sub': '3', 'heating the cold-pressed part to a temperature of ACor more to form the remaining 1 to 20% of the final shape, followed by quenching the formed automobile part received within dies to ...

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-treatment hardening steel satisfies anyone 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%. 1. Heat-treatment hardening steel comprising: by 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; at least one of Ti and Nb: 0.2% or less; components satisfying any one of the following compositions i) to iv); and the balance of Fe and unavoidable impurities.By wt %,i) Si: 0.5˜3%; Mn: 1˜10%; and Al: 0.05˜2%ii) Si: 1% or less; Mn: 0.5˜5%; Al: 0.1˜2.5%; and Ni: 0.01˜8%iii) Si: 0.5˜3%; Mn: 1˜10%; Al: 0.1% or less; and Ni: 0.01˜8%iv) Si: 0.5˜3%; Mn: 1˜10%; Al: 0.1˜2.5%; and Ni: 0.01˜8%.2. The heat-treatment hardening steel according to claim 1 , wherein the steel comprises a composite microstructure of martensite and retained austenite after heat treatment.3. The heat-treatment hardening steel according to claim 1 , wherein the steel has a tensile strength of 490 MPa to 980 MPa claim 1 , a yield strength of 370 MPa to 600 MPa and an elongation of 20% to 50% before heat treatment.4. The heat-treatment hardening steel according to claim 3 , wherein the steel has a tensile strength of 1000 MPa or more claim 3 , a yield strength of 800 MPa or more and an elongation of 10% or more after heat treatment.5. The heat-treatment hardening ...

METHOD FOR IMPROVING THE WELDABILITY OF HOT STAMPING PARTS

A method for improving the weldability of hot stamping parts improving weldability of hot stamping parts with degraded weldability due to surface oxides is provided. 1. A method for improving the weldability of hot stamping parts , comprising:selecting a welding region in a hot stamping part;removing surface oxide layer of the welding region; andperforming welding on a welding region on a hot stamping part with the surface oxide removed.2. A method for improving the weldability of hot stamping parts according to claim 1 , wherein the hot stamping part is a material of Al—Si plated steel sheet.3. A method for improving the weldability of hot stamping parts according to claim 1 , wherein the hot stamping part is a material of Al—Si plated steel sheet and welding is performed on the welding region using projection welding.4. A method for improving the weldability of hot stamping parts according to claim 1 , wherein the hot stamping part is a material of Al—Si plated steel sheet and welding is performed on the welding region using projection welding claim 1 , and a grinder is used or a laser grinder is used when removing surface oxide.5. A method for improving the weldability of hot stamping parts claim 1 , comprising:selecting a welding region in a hot stamping part;removing surface oxide layer of the welding region;removing remnant of oxide layer and portion of plating layer of the welding region; andperforming welding on a welding region on a hot stamping part with remnant of oxide layer and portion of plating layer removed.6. A method for improving the weldability of hot stamping parts according to claim 5 , wherein the hot stamping part is a material of Al—Si plated steel sheet.7. A method for improving the weldability of hot stamping parts according to claim 5 , wherein the hot stamping part is a material of Al—Si plated steel sheet and welding is performed on the welding region using projection welding.8. A method for improving the weldability of hot stamping ...

Hot stamping apparatus and method for preventing plating from sticking to mold

Disclosed is a hot stamping device and method for preventing plating from sticking to a die. The hot stamping device may include a die that receives a heated plating material, presses the received plating material, and rapidly cools the pressed plating material in a constrained state. Before the plating material is pressed, an anti-sticking layer may be formed on the surface of the die disposed in contact with the plating material.

PREPARATION METHOD OF STEEL PRODUCT HAVING DIFFERENT STRENGTHS USING LASER HEAT TREATMENT, AND HEAT HARDENED STEEL USED THEREIN

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. 1. A method for manufacturing a steel product , comprising:(a) preparing a material comprising: by weight %, 0.1˜0.5% of carbon (C) ; 0.1˜0.5% of silicon (Si); 0.5˜3.0% of manganese (Mn); 0.1% or less of phosphorus (P); 0.05% or less of sulfur (S); 0.01˜1.0% of chromium (Cr); 0.1% or less of aluminum (Al); 0.2% or less of titanium (Ti); 0.0005˜0.08% of boron (B); and the balance of Fe and unavoidable impurities;(b) producing a formed body by forming the material into a predetermined shape; and(c) performing laser heat treatment to a part requiring high strength (high strength part) in the formed body, and locally strengthening the high strength part.2. The method according to claim 1 , wherein claim 1 , in step (a) claim 1 , a layer selected from Al plating layer claim 1 , Al—Si plating layer claim 1 , Zn—Ni plating layer claim 1 , Zn plating layer claim 1 , Zn—Al plating layer and high-temperature oxidation-resistant resin coating layer is formed on the surface of the material.3. The method according to claim 1 , wherein claim 1 , in step (c) claim 1 , the laser heat treatment irradiating a laser on the high strength part and heating the high strength part to a temperature higher than Ac3 claim 1 , ...

AUTOMOBILE PART MANUFACTURING METHOD USING QUENCHED STEEL SHEET

Disclosed herein is method of manufacturing an automobile part having different local strengths, more particularly, a method of manufacturing an automobile part using a steel sheet subjected to heat-treatment hardening and having different local thicknesses. The method includes preparing blank sheets using steel sheets subjected to heat-treatment hardening and having different thicknesses or different material properties according to desired strength; forming a blank assembly by joining the blank sheets to each other via laser welding; cold-pressing the blank assembly; and heating the cold-pressed part to a temperature of ACor more, followed by quenching the cold-formed part received within dies to remove residual stress while increasing strength of the automobile part. 1. A method of manufacturing an automobile part , comprising:preparing blank sheets using steel sheets subjected to heat-treatment hardening and having different thicknesses or different material properties according to desired strength;forming a blank assembly by joining the blank sheets to each other via laser welding;cold-pressing the blank assembly to an extent of 80 to 99% of a final shape of the automobile part; and{'sub': '3', 'heating the cold-pressed part to a temperature of ACor more to form the remaining 1 to 20% of the final shape, followed by quenching the formed automobile part received within dies to remove residual stress while increasing strength of the automobile part.'}2. The method of claim 1 , wherein the steel sheets in preparation of the preparing blank sheets are subjected to surface treatment by at least one process selected from among Zn plating claim 1 , Al plating claim 1 , Al—Si plating and high temperature oxidizing agent coating.3. The method of claim 1 , wherein the steel sheets in preparation of the blank sheets comprise 0.15 to 0.5 wt % of carbon (C) claim 1 , 0.15 to 0.5 wt % of silicon (Si) claim 1 , 0.5 to 3.0 wt % of manganese (Mn) claim 1 , 0.1 wt % or less of ...

PREPARATION METHOD OF STEEL PRODUCT HAVING DIFFERENT STRENGTHS USING LASER HEAT TREATMENT, AND HEAT HARDENED STEEL USED THEREIN

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. 1. A heat treated hardened steel comprising:by weight %, 0.1˜0.5% of carbon (C); 0.1˜0.5% of silicon (Si); 0.5˜3.0% of manganese (Mn); 0.1% or less of phosphorus (P); 0.05% or less of sulfur (S); 0.01˜1.0% of chromium (Cr); 0.1% or less of aluminum (Al); 0.2% or less of titanium (Ti); 0.0005˜0.08% of boron (B); and the balance of Fe and unavoidable impurities;having a tensile strength of 400˜990 MPa and an elongation of 10˜40% before heat treatment, and having a tensile strength of 1200˜1900 MPa and an elongation of 1˜13% after heat treatment.2. The heat treated hardened steel according to claim 1 , wherein the steel has a layer selected from Al plating layer claim 1 , Al—Si plating layer claim 1 , Zn—Ni plating layer claim 1 , Zn plating layer claim 1 , Zn—Al plating layer and high-temperature oxidation-resistant resin coating layer is formed on the surface of the steel. This present application is a Divisional Application of U.S. Ser. No. 14/343,955 filed Mar. 10, 2014, which claims the benefit under 35 U.S.C. 371 as a national stage of PCT/KR2011/007703 filed on Oct. 17, 2011, and claims priority benefit from Korean Application No. 10-2011-0100174 filed on Sep. 30, 2011, the content of each of ...

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-treatment hardening steel satisfies anyone 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%. 1. A method for manufacturing a heat-treatment hardening component , comprising:(a) preparing a blank formed of heat-treatment hardening steel, the heat-treatment hardening steel comprising: by 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, at least one of Ti and Nb: 0.2% or less, components satisfying anyone of the following compositions i) to iv), and the balance of Fe and unavoidable impurities;By wt %,i) Si: 0.5˜3%; Mn: 1˜10% and Al: 0.05˜2%ii) Si: 1% or less; Mn: 0.5˜5%; Al: 0.1˜2.5% and Ni: 0.01˜8%iii) Si: 0.5˜3%; Mn: 1˜10%; Al: 0.1% or less and Ni: 0.01˜8%iv) Si: 0.5˜3%; Mn: 1˜10%; Al: 0.1˜2.5% and Ni: 0.01˜8%,(b) heating the blank;(c) hot-forming and quenching the heated blank in dies; and(d) performing post-treatment of a formed body formed in the (c) hot-forming and quenching.2. The method according to claim 1 , wherein the (b) heating is performed by heating the blank to a temperature of 700° C. to 1100° C.3. The method according to claim 1 , wherein claim 1 , in the (c) hot-forming and quenching claim 1 , quenching is performed by cooling the heated blank in the dies at a rate of 10° C./sec to 300° C./sec to a ...

HOT STAMPING PRODUCT WITH ENHANCED TOUGHNESS AND METHOD FOR MANUFACTURING THE SAME

Disclosed are a hot stamping part with enhanced toughness and a method for manufacturing the same, in which the hot stamping part has a tensile strength (TS) of 700-1,200 MPa after hot stamping while guaranteeing elongation (EL) of 12% or more by adjusting alloy components and controlling process conditions. 1. A hot stamped product comprising: carbon (C): 0.05˜0.14% by weight (wt %) , silicon (Si): 0.01˜0.55 wt % , manganese (Mn): 1.0˜2.3 wt % , chromium (Cr): 0.01˜0.38 wt % , molybdenum (Mo): 0.05˜0.30 wt % , aluminum (Al): 0.01˜0.10 wt % , titanium (Ti): 0.03˜0.10 wt % , niobium (Nb): 0.02˜0.10 wt % , vanadium (V): 0.05 wt % or less , boron (B): 0.001 wt % or less , and the balance of iron (Fe) and unavoidable impurities , the hot stamped product having a tensile strength (TS) of 700 MPa to 1 ,200 MPa and an elongation (EL) of 12.0% to 17.0% after hot stamping.2. The hot stamped product according to claim 1 , wherein the hot stamped product comprises at least one of phosphorus (P): 0.04 wt % or less and sulfur (S): 0.015 wt % or less.3. A method for manufacturing a hot stamped product claim 1 , comprising:(a) forming a cold-rolled steel sheet through pickling and cold rolling a hot-rolled steel sheet, the hot-rolled steel sheet comprising carbon (C): 0.05˜0.14 wt %, silicon (Si): 0.01˜0.55 wt %, manganese (Mn): 1.0˜2.3 wt %, chromium (Cr): 0.01˜0.38 wt %, molybdenum (Mo): 0.05˜0.30 wt %, aluminum (Al): 0.01˜0.10 wt %, titanium (Ti): 0.03˜0.10 wt %, niobium (Nb): 0.02˜0.10 wt %, vanadium (V): 0.05 wt % or less, boron (B): 0.001 wt % or less, and the balance of iron (Fe) and unavoidable impurities;(b) annealing the cold-rolled steel sheet at a temperature of 740° C. to 840° C., followed by hot dip plating;(c) cutting the hot dip-plated steel sheet to form a blank;(d) heating the blank to a temperature of 850° C. to 950° C.; and(e) transferring the heated blank to a press mold, followed by hot stamping and then cooling the pressed product within the press mold in a ...

Preparation method of steel product having different strengths using laser heat treatment, and heat hardened steel used therein

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.

Heat-hardened steel with excellent crashworthiness and method for manufacturing heat-hardenable parts using same

Method of and apparatus for ensuring proper orientation of an object for ion implantion

An object alignment inspecting apparatus is used to prevent a channeling phenomenon form occurring in an ion implantation process. The apparatus includes a body having the shape of an object to be processed and a series of graduations extending along its outer peripheral edge, a center post protruding from the center of the body; and an indicator having a rotary member freely rotatably mounted to the post and extending from the post to the graduations. In use, the alignment angle inspecting apparatus is placed on the disc of ion implantation equipment that is used to support the object during the ion implantation process. The relative rotational position of the apparatus on the disc is read. This information is used to determine whether the object, when placed on the disc, will assume a relative rotational position which will not give rise to the channeling phenomenon. Also, the object alignment inspecting apparatus may have a plumb mechanism and graduations so that the slope of the disc can be determined as well. The slope of the disc can be adjusted based on the reading taken form the plumb mechanism so as to also ensure that the channeling phenomenon will not occur.

Method for manufacturing automobile part having different local strengths using heat-treatment hardening steel plate

Heat-hardened steel with excellent crashworthiness and method for manufacturing heat-hardenable parts using same

Zařízení pro lisování za tepla a způsob zabraňování přilepování plátování k formě

Hot stamping product with enhanced toughness and method for manufacturing the same

Disclosed are a hot stamping part with enhanced toughness and a method for manufacturing the same, in which the hot stamping part has a tensile strength (TS) of 700-1,200 MPa after hot stamping while guaranteeing elongation (EL) of 12% or more by adjusting alloy components and controlling process conditions.