Manganese sulfide inclusion control technology in medium and high sulfur steel
XIE Xiao-yu1, GU Chao1, WANG Min1, BAO Yan-ping1, LUO Xiong-zhi2, PENG Guang-jian2
1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China; 2. Department of Technology and Quality, Hunan Valin Xiangtan Ironand Steel Co., Ltd., Xiangtan 411101, Hunan, China
Abstract：In recent years, with the continuous upgrading of manufacturing industry, the requirement of energy saving and environmental protection becomes higher and higher. For some steels used in the manufacture of complex parts, free-cutting elements (S, Te, Pb) are usually added to steel to improve its cutting performance in order to reduce energy consumption in the manufacturing process. Adding a certain amount of sulfur is the most commonly used improvement method at present. Sulfur mainly exists in the form of manganese sulfide in steel, and its morphology and distribution control level have important influence on the mechanical properties of steel. For medium and high sulphur steel, manganese sulfide is a plastic inclusion, which is easy to aggregate during precipitation and to deform along the rolling direction during rolling to form large-size strips. Such large-size manganese sulfide can seriously destroy the transverse properties of materials. To ensure the steel properties of medium and high sulphur steels, it is necessary to control the morphology and distribution of manganese sulphide inclusions in steel. The goal is to avoid the generation of large-size manganese sulphide and to obtain spindle-like manganese sulphide inclusions with fine and uniform distribution as possible. Manganese sulfide inclusion control is a systematic problem and must be carried out in conjunction with the entire process. The influence laws of some chemical compositions and process parameters on the inclusion precipitation of manganese sulfide were summarized. And the previous manganese sulfide inclusion control practices in the whole production process, including modification treatment of refining process, compound precipitation control, solidification process control and rolling and cooling control were reviewed. It is also pointed out that for the MnS control of non-quenched and tempered free cutting steel with medium and high sulfur content, how to implement the laboratory research results in industrial production is the direction of joint efforts for the majority of researchers in the future.
谢啸宇, 顾超, 王敏, 包燕平, 罗雄志, 彭光健. 中高硫钢中硫化锰夹杂物控制技术[J]. 钢铁, 2021, 56(12): 52-61.
XIE Xiao-yu, GU Chao, WANG Min, BAO Yan-ping, LUO Xiong-zhi, PENG Guang-jian. Manganese sulfide inclusion control technology in medium and high sulfur steel[J]. Iron and Steel, 2021, 56(12): 52-61.
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