High-quality extra-thick steel plate and production method thereof

• Main Authors: ZHOU DEGUANG, WANG QINGMIN, WANG DONGZHU, FENG WEI, FENG BO, SHI DAXING, YU WENFEI, HAN CHENGLIANG, WANG GENJI, WAN XIAO, YU HAIBO, QI YAN, SUN BO, TOGAWA, WEI YUNFEI
• Format: Patent
• Language: Chinese; English
• Published: 09.09.2022
• 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 particularly relates to a high-quality extra-thick steel plate and a production method thereof, and belongs to the technical field of steel preparation, and the steel plate comprises the following chemical components in percentage by mass: 0.15%-0.18% of C, 0.40%-0.50% of Si, 1.50%-1.60% of Mn, 0.02%-0.04% of Alt, 0.010%-0.03% of Ti, less than 0.012% of P, less than 0.005% of S and the balance of Fe and inevitable impurities. The composition design of high C, high Si and high Mn is adopted, the strength is improved through solution strengthening instead of fine grain strengthening adopting two-stage rolling at present, and the problems that rolling deformation of a non-recrystallization area of a two-stage rolled extra-thick plate is uneven, and the thickness section structure and performance difference of the steel plate is large are solved. 本发明特别涉及一种高品质特厚钢板及其生产方法，属于钢材制备技术领域，钢板的化学成分以质量分数计包括：C：0.15％-0.18％，Si:0.40％-0.50％，Mn：1.50％-1.60％，Alt：0.02％-0.04％，Ti：0.010％-0.03％，P＜0.012％，S＜0.005％，其余为Fe和不可避免的