STEEL SHEET HAVING EXCELLENT RESISTANCE TO HYDROGEN INDUCED CRACKING, AND METHOD OF MANUFACTURING THE SAME

• Main Authors: PARK, JAE HYUN, KOH, SEONG UNG, BAE, MOO JONG
• Format: Patent
• Language: English; Korean
• Published: 05.07.2016
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The present invention relates to a steel sheet having excellent resistance to hydrogen induced cracking, comprising: 0.03-0.06 wt% of carbon (C); 0.2-0.4 wt% of silicon (Si); 1.0-1.6 wt% of manganese (Mn); 0.03 wt% or less of phosphorus (P); 0.003 wt% or less of sulfur (S); 0.06 wt% or less of aluminum (Al); 0.01 wt% or less of nitrogen (N); 0.05-0.4 wt% of copper (Cu); 0.05-0.5 wt% of nickel (Ni); 0.0005-0.003 wt% of calcium (Ca); and the remaining consisting of iron (Fe) and inevitable impurities. Moreover, the steel sheet having excellent resistance to hydrogen induced cracking may further comprise at least one of 0.005-0.05 wt% of niobium (Nb) or 0.005-0.03 wt% of titanium (Ti). 본 발명은 수소유기균열 저항성이 우수한 후판 강재에 관한 것으로, C: 0.03~0.06 중량%, Si: 0.2~0.4 중량%, Mn: 1.0~1.6 중량%, P: 0.03 중량% 이하, S: 0.003 중량% 이하, Al: 0.06 중량% 이하, N: 0.01 중량% 이하 및 Cu: 0.05~0.4 중량%, Ni: 0.05~0.5 중량%, Ca: 0.0005~0.003 중량%, 잔부 Fe 및 불가피한 불순물을 더 포함한다. 또한, Nb: 0.005~0.05 중량% 및 Ti: 0.005~0.03 중량% 중 적어도 하나를 더 포함할 수 있다.