PRESSURE VESSEL STEEL WITH EXCELLENT LOW TEMPERATURE TOUGHNESS AND SULFIDE STRESS CORROSION CRACKING, MANUFACTURING METHOD THEREOF AND MANUFACTURING METHOD OF DEEP DRAWING ARTICLE

The present invention relates to steel for a low temperature and high pressure vessel. More specifically, the present invention relates to steel for a high pressure vessel having low temperature toughness and sulfide stress corrosion cracking (SSCC), a manufacturing method thereof, and a manufacturing method of a deep drawing article. To achieve this, the steel for a high pressure vessel having low temperature toughness and SSCC comprises: 0.3-0.4 wt% of C, 0.15-0.40 wt% of Si, 0.4-1.0 wt% of Mn, 0.001-0.05 wt% of Al, 0.8-1.2 wt% of Cr, 0.15-0.80 wt% of Mo, less than or equal to 0.1 wt% of Ni, 0.0005-0.0020 wt% of Ca, less than or equal to 0.015 wt% of P, less than or equal to 0.015 wt% of S, and a remaining amount of Fe and impurities. A fine structure is composed of a three-phase composite structure of ferrite, bainite, and martensite. 본 발명은 저온 고압용기용 강재에 관한 것으로서, 보다 상세하게는 저온인성 및 황화수소 응력부식 균열(Sulfide Stress Corrosion Cracking, SSCC)에 대한 저항성이 우수한 고압용기용 강재 및 이의 제조방법과 상기 강재를 이용한 딥 드로잉 제품의 제조방법에 관한 것이다.