Method for improving thickness of decarburized layer of small square billet of tire cord steel

• Main Authors: WU NIANCHUN, LIU CHAOXIA, WEI ZHIWEN, FENG GONGXIONG, ZHENG JIANQIANG, LI YUHUA, YIN YUQUN
• Format: Patent
• Language: Chinese; English
• Published: 04.07.2012
• Subjects: CHEMISTRY; 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

The invention belongs to the technical field of the metallurgy and processing of iron and steel and provides a method for improving the thickness of a decarburized layer of a small square billet of tire cord steel. The tire cord steel is produced by adopting the technological processes of heating, rough rolling, intermediate rolling, pre-finishing, finishing and air cooling. The method for improving the thickness of the decarburized layer of the small square billet of the tire cord steel comprises the following steps that: prior to the technological process of heating, corner grinding or whole-stripping treatment is carried out on the square billet; the total detention time for the square billet in a heating furnace is less than 150 min, and the detention time in a soaking section is lessthan 45 min; fuel gas is fully combusted in the soaking section, wherein the air-fuel ratio in a heating I section is set to be 1.1, the air-fuel ratio in a heating II section is set to be 0.9, and the air-fuel ratio in the s