Method for controlling surface oxide scale defect of high-Ni super-thick steel plate

• Main Authors: LIU SHUANG, YAO NANJUN, SHEN BIN, ZI XIANPENG, XIAO QIANGJIAN
• Format: Patent
• Language: Chinese; English
• Published: 26.07.2024
• 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; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; PUNCHING METAL; ROLLING OF METAL; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention relates to a control method for scale defects on the surface of a high-Ni super-thick steel plate. The steel billet material comprises the following chemical components in percentage by weight: 0.11-0.15% of C, 0.15-0.35% of Si, less than or equal to 1.60% of Mn, less than or equal to 0.010% of P, less than or equal to 0.002% of S, less than or equal to 0.80% of Cr, less than or equal to 0.60% of Mo, 1.00-3.0% of Ni, less than or equal to 0.4% of Cu, 0.06-0.09% of Al, less than or equal to 0.06% of V, less than or equal to 0.04% of Nb, less than or equal to 0.006% of N, less than or equal to 0.002% of B and the balance of Fe and inevitable impurity elements. On the basis of the design of adding high-Ni alloying treatment components, the special performance control requirements and the steel billet with the thickness of 450 mm, appropriate production process parameters such as heating, descaling and rolling are adopted, and the problems of generation and removal of high-viscosity oxide scales gen