Optimization of electroslag remelting slag system of H13 hot work die steel
WANG Hong-tao1,2, HAN Yi-hua1,2, CAO Li-jun2,3, ZHU Li-guang4
1. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China; 2. Hebei Tool and Die Steel Technology Innovation Center, Zunhua 064200, Hebei, China; 3. Tangshan Zhiwei Technology Co., Ltd., Tangshan 064200, Hebei, China; 4. College of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, Hebei, China
Abstract:Die steel is the most important part of mold, its variety, specifications and quality play a decisive role in the performance, service life and manufacturing cycle of the mold. Due to the strict quality requirements of die steel, higher requirements are put forward on the production technology and preparation process of die steel. The steel ingot smelted by the electroslag remelting (ESR) process has the advantages of high uniformity, high cleanliness and low segregation, gradually become one of the main technical means for smelting high-quality die steel. During electroslag remelting, the slag system plays a key role in melting electrodes, molten steel refining, solidification and crystallization, etc, it is the basis of smelting stability, therefore, selecting appropriate slag composition and performance is the key to the electroslag remelting process. This research combined the characteristics of 4Cr5MoSiV1 hot work die steel, take the current five H13 hot work die steel ESR slag systems of a steel factory as the research object, through the physical and chemical performance analysis and microstructure research of the slag systems, the direction of slag system optimization was put forward, then defined the slag systems suitable for ESR remelting H13 hot work die steel. The results shows that the melting point, viscosity, density, optical alkalinity, electrical conductivity and other physical and chemical properties of L4 slag system is better. The average coordination number of Al in the slag is the largest while it is 2.39. Moreover, the proportion of Al with three coordination and four coordination is relatively high, and the network structure is more complicated. Complex structural units Q3 and Q4 have the most content, and they have a network structure with high polymerization degree. Al—O bond length is short and Si—O, Si—F bonds with shorter bond lengths, electroslag remelting process is the most stable, using this slag system can effectively improve the structure and performance, surface quality of H13 steel, and reduce power consumption. The research results provide theoretical guidance for the industrial production of H13 hot work die steel electroslag remelting in a steel factory.
王洪涛, 韩毅华, 曹立军, 朱立光. H13热作模具钢电渣重熔渣系优化[J]. 钢铁, 2022, 57(8): 111-122.
WANG Hong-tao, HAN Yi-hua, CAO Li-jun, ZHU Li-guang. Optimization of electroslag remelting slag system of H13 hot work die steel[J]. Iron and Steel, 2022, 57(8): 111-122.
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