Method for controlling surface defects of steel casting blank for sulfuric acid dew point corrosion resistance

• Main Authors: ZHANG YUANQIANG, GUAN LIUHUI, ZHANG ZHENSHEN, WANG HAIYAN, WANG ZHONGQI, AN LIANGLIANG, XIA ZHISHENG, HUANG ZHONG, WANG XINZHI, ZHANG LINGZHI, DUAN GUISHENG, ZHANG SHENGWEI, GAO XINJUN, HU YUFA, SUN YUQIANG, XU GANG, WANG XIANGSONG, LIU HAIQIANG, KONG DENAN
• Format: Patent
• Language: Chinese; English
• Published: 03.12.2019
• Subjects: ALLOYS; CASTING; CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; PERFORMING OPERATIONS; POWDER METALLURGY; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention provides a method for controlling the surface defects of a steel casting blank for sulfuric acid dew point corrosion resistance, and belongs to the technical field of metallurgical steelmaking. The method specifically comprises the steps of controlling the crystallizer water temperature to be not lower than 36 DEG C, the wide-face water inlet and outlet temperature difference to be 3-5 DEG C and the narrow-face water inlet and outlet temperature difference to be 4-7 DEG C; controlling the water temperature of a secondary cooling section of the casting blank not to be lower than 35 DEG C by means of adjusting a plate heat exchanger, steam heating and the like, wherein a cooling mode adopts a segmented control aerial fog cooling mode. According to the method, the transverse cracks and the corner crack defects on the surface of the casting blank of the sulfuric acid dew point corrosion resistant steel can be effectively controlled, the occurrence rate is controlled within 1%, the qualification rate