Discussion of austenitic stainless steel inclusion control technology
ZHANG Xin- jie，ZHANG Huan- huan，CUI Li- min
（Hebei Engineering Research Center for Special Alloy Regeneration, AVIC Shangda High Temperature Alloy Material Co., Ltd., Xingtai 054800, Hebei, China）
Abstract：The inclusions in austenitic stainless steel impact on the corrosion resistant performance of the steel, as well as the plasticity, toughness and fatigue resistance. The technology of EAF+LF+AOD adopted by the AVIC Shangda High Temperature Alloy Material Co., Ltd. for controlling the austenitic stainless steel inclusion is introduced. The main source and production mechanism of inclusions are analyzed, and the control of the inclusion of smelting process is systematically planned in the process design. By strengthening the raw material control, optimizing AOD deoxidizing system, applying the calcium treatment and weak mixing process in LF refining to modify the inclusion, and adopting the technology of argon protecting pouring in the casting pouring, the decrease and steady control of the content of inclusions in steel are finally realized, which can meet the quality requirements of nuclear power station, pressure vessel and other high- end stainless steel tube billets.
2018, Vol. 28 
