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1. WO2015099455 - HOT DIP GALVANIZED STEEL SHEET HAVING EXCELLENT RESISTANCE TO CRACKING DUE TO LIQUID METAL EMBRITTLEMENT

Publication Number WO/2015/099455
Publication Date 02.07.2015
International Application No. PCT/KR2014/012824
International Filing Date 24.12.2014
IPC
C23C 2/06 2006.1
CCHEMISTRY; METALLURGY
23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
2Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
04characterised by the coating material
06Zinc or cadmium or alloys based thereon
C23C 28/00 2006.1
CCHEMISTRY; METALLURGY
23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
28Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of main groups C23C2/-C23C26/173
C22C 38/00 2006.1
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
CPC
C22C 18/00
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
18Alloys based on zinc
C22C 38/00
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
C22C 38/001
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
001containing N
C22C 38/002
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
002containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
C22C 38/02
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
02containing silicon
C22C 38/04
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
04containing manganese
Applicants
  • 주식회사 포스코 POSCO [KR]/[KR]
Inventors
  • 이주연 LEE, Ju-Youn
  • 진광근 CHIN, Kwang-Geun
  • 전선호 JEON, Sun-Ho
  • 김종상 KIM, Jong-Sang
  • 김명수 KIM, Myung-Soo
Agents
  • 특허법인 씨엔에스 C&S PATENT AND LAW OFFICE
Priority Data
10-2013-016333625.12.2013KR
Publication Language Korean (ko)
Filing Language Korean (KO)
Designated States
Title
(EN) HOT DIP GALVANIZED STEEL SHEET HAVING EXCELLENT RESISTANCE TO CRACKING DUE TO LIQUID METAL EMBRITTLEMENT
(FR) TÔLE D'ACIER PLAQUÉE PAR DU ZINC FONDU PRÉSENTANT UNE EXCELLENTE RÉSISTANCE AUX FISSURES DUES À UN BROMURE MÉTALLIQUE LIQUIDE
(KO) 액체금속취화에 의한 크랙 저항성이 우수한 용융아연도금강판
Abstract
(EN) The objective of the present invention is to provide a molten zinc plated steel sheet with excellent crack resistance due to liquid metal bromide. One aspect of the present invention provides a molten zinc plated steel sheet with excellent crack resistance due to liquid metal bromide, the steel sheet comprising: a base steel sheet having a microstructure in which the fraction of austenite is greater than or equal to 90 area%; and a molten zinc plated layer formed on the base steel sheet, wherein the molten zinc plated layer comprises: a Fe-Zn alloy layer; and a Zn layer formed on the Fe-Zn alloy layer, and the Fe-Zn alloy layer provides a molten zinc plated steel sheet having a thickness of [(3.4×t)/6]㎛ or more with excellent crack resistance due to liquid metal bromide (where t is the thickness of the molten zinc plated steel sheet). The present invention can prevent a plated layer peeling phenomenon which easily occurs in common car welding and molding conditions, and can also provide a molten zinc plated steel sheet in which crack occurrence due to liquid metal bromide is suppressed.
(FR) L'objectif de la présente invention concerne une tôle d'acier plaquée par du zinc fondu présentant une excellente résistance aux fissures dues à un bromure métallique liquide. Un aspect de la présente invention concerne une tôle d'acier plaquée par du zinc fondu présentant une excellente résistance aux fissures dues à un bromure métallique liquide, la tôle d'acier comprenant : une tôle d'acier de base présentant une microstructure dans laquelle la fraction d'austénite est supérieure ou égale à 90 % en surface ; et une couche plaquée de zinc fondu formée sur la tôle d'acier de base, la couche plaquée de zinc fondu comprenant : une couche d'alliage Fe-Zn ; et une couche de Zn formée sur la couche d'alliage Fe-Zn et la couche d'alliage Fe-Zn permet d'obtenir une tôle d'acier plaquée par du zinc fondu présentant une épaisseur de [(3,4×t)/6] ㎛ ou plus présentant une excellente résistance aux fissures dues à un bromure métallique liquide (où t est l'épaisseur de la tôle d'acier plaquée par du zinc fondu). La présente invention permet d'empêcher un phénomène de pelage d'une couche plaquée qui survient facilement dans des conditions courantes de soudage et de moulage de voitures et permet également d'obtenir une tôle d'acier plaquée par du zinc fondu dans laquelle l'apparition de fissures dues à un bromure métallique liquide est supprimée.
(KO) 본 발명은 액체금속취화에 의한 크랙 저항성이 우수한 용융아연도금강판을 제공하고자 하는 것이다. 본 발명의 일 실시형태는 오스테나이트의 분율이 90면적%이상인 미세조직을 갖는 소지강판; 및 상기 소지강판 상에 형성된 용융아연도금층을 포함하고, 상기 용융아연도금층은, Fe-Zn 합금층; 및 상기 Fe-Zn 합금층 상에 형성된 Zn층을 포함하며, 상기 Fe-Zn 합금층은 [(3.4×t)/6]㎛이상의 두께를 갖는 액체금속취화에 의한 크랙 저항성이 우수한 용융아연도금강판을 제공한다. (단, 상기 t는 상기 용융아연도금층의 두께임.) 본 발명에 따르면, 통상적인 자동차 용접 및 성형 조건에서 쉽게 일어나는 도금층 박리현상이 방지될 뿐만 아니라, 액체금속취화에 의한 크랙 발생이 억제된 용융아연도금강판을 제공할 수 있다.
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