HIGH-STRENGTH STEEL SHEET EXCELLENT IN SEAM WELDABILITY

The present invention relates to a high-strength steel sheet with excellent seam weldability and having a tensile strength equal to or greater than 1180Mpa, in which the steel sheet comprises: 0.12-0.40 wt% of C; 0.03-0.5 wt% of Si; 0.01-1.5 wt% of Mn; 0.032-0.15 wt% of Al; 0.01 wt% or less of N; 0....

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Bibliographische Detailangaben
Hauptverfasser:	UTSUMI YUKIHIRO, SHIRAKI ATSUHIRO
Format:	Patent
Sprache:	eng ; kor
Schlagworte:	ALLOYS CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL FERROUS OR NON-FERROUS ALLOYS INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	The present invention relates to a high-strength steel sheet with excellent seam weldability and having a tensile strength equal to or greater than 1180Mpa, in which the steel sheet comprises: 0.12-0.40 wt% of C; 0.03-0.5 wt% of Si; 0.01-1.5 wt% of Mn; 0.032-0.15 wt% of Al; 0.01 wt% or less of N; 0.02 wt% or less of P; 0.01 wt% or less of S; 0.01-0.2 wt% of Ti; 0.0001-0.01 wt% of B; and the remaining including iron and inevitable impurities, wherein Ceq1(=C+Mn/5+Si/13) is equal to or less than 0.50 wt%, and a steel structure is a martensite single structure. 심 용접성이 우수하고 인장 강도가 1180MPa 이상인 고강도 강판으로서, 강판의 화학 성분이, C: 0.12 내지 0.40%, Si: 0.003 내지 0.5%, Mn: 0.01 내지 1.5%, Al: 0.032 내지 0.15%, N: 0.01% 이하, P: 0.02% 이하, S: 0.01% 이하, Ti: 0.01 내지 0.2% 이하, 및 B: 0.0001 내지 0.01%를 만족시키고, 잔부가 철 및 불가피한 불순물로 이루어짐과 함께, Ceq1(=C+Mn/5+Si/13)이 0.50% 이하이며, 강 조직이 마르텐사이트 단일 조직이다.