Advanced manufacturing techniques for construction machinery steel(part 2)
The construction machinery industry has developed rapidly in recent years,driving the technological advancement of the upstream steel industry in the production of steel for construction machinery.Based on the urgent requirement of the construc-tion machinery industry,steel enterprises in China have cooperated with universities and research institutes to develop a series of key common technologies:(1)to address the issue of insufficient compression ratio faced in the production of ultra-heavy plates,liquid core reduction technique and"temperature-deformation"coupling control rolling process were developed to promote de-formation penetrated into the center of the plate,improving the internal shrinkage/porosity defects;(2)the ultra-fast cooling technology was developed to achieve on-line microstructure and properties control of steel for construction machinery;(3)ultra-thin and ultra-heavy plates off-line quenching equipment were developed,solving the bottleneck problems of insufficient cooling capacity for heavy plates and poor flatness for thin plates observed in heat treatment processes;(4)the on-line heat treatment process and equipment for thin and ultra-thin plates were developed,achieving environmentally friendly production of steel for construction machinery;(5)by utilizing digital means and leveraging the extensive data obtained during the hot rolling process,the inadequacy in stability during the production of steel for construction machinery have been resolved.The aforementioned key common technologies and their applications are introduced,enabling stable mass production of various types of construction ma-chinery steel characterized by high-strength,high-toughness,ultra-heavy,and ultra-thin,among others.Moreover,the research and development history of typical construction machinery steel products used in China are also introduced,the high-performance and branding strategies adopted by well-known domestic steel enterprises during the development and promotion of construction machinery steel are analyzed,and the whole life-cycle recycling strategy for construction machinery steel is discussed.Through synergistic breakthrough cooperation in"production,learning,research,manufacturing,and application",domestic steel enterprises have developed various types of steel materials that meet the critical raw material manufacturing requirements of construction machinery industry,promoting the development of related industries and enhancing the international competitiveness of China in construction machinery industry.
construction machinery steelultra-heavy slab continuous castingthermo-mechanical control processintegrated control of"shape-property-surface"on-line/off-line microstructure and properties controldigital production technologygreen production
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