Low-temperature spherical tank steel and production method thereof

• Main Authors: YU CHAO, CAI LIANDONG, QU HUACHEN, YUAN DAWEI, LIU PENG, QI TIANSHENG, REN ZHIHUI, LU XINGFENG, HAN CHENLONG, LIU YANGYANG
• Format: Patent
• Language: Chinese; English
• Published: 14.05.2024
• 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 invention belongs to the technical field of metallurgy, and particularly relates to low-temperature spherical tank steel and a production method thereof.The low-temperature spherical tank steel adopts an LF + RH refining + controlled rolling and controlled cooling + hardening and tempering process route, and by controlling parameters such as refining slag and rolling reduction rate, the internal quality of a plate blank and the grain structure of a finished steel plate are improved, the metallographic structure is uniform, and the inclusion and segregation degree are reduced; and by adjusting controlled rolling and controlled cooling processes, the mechanical properties of the steel plate at low temperature such as low-temperature impact are improved, and the technical problems that the steel plate is insufficient in hardenability, unstable in core impact, high in plate shape control difficulty and insufficient in performance homogeneity are successfully solved. 本发明属于冶金技术领域，具体涉及一种低温球罐钢及其生产方法，本发明采用LF+RH精炼+