Abstract
According to the three kinds of MRT3-BA steel technological processes, which include BOF→LF→CC, BOF→RH→CC and BOF→LF→RH→CC, some systematic analysis are introduced to research on the contents of T[O] and [N], and the type, composition and quantity of micro-inclusions in the three processes. The level of cleanliness in billet will also be systematic analysed in comparative. The results of the study show that the contents of T[O] respectively are 20.8×10-6, 14.3×10-6 and 13×10-6 in billet of Process 1, Process 2, Process 3. Through the comparison with production data of other manufacturers, control of T[O] has reached a high level in MRT3-BA deep punching steel. The numbers of micro-inclusions respectively are 6.8/mm2, 5.66/mm2 and 5.36/mm2 in billet; the control level in MRT3-BA steel has reached domestic advanced level. Taken steel cleanliness and production cost into account, the better technological process of MRT3-BA stamping steel is BOF→RH→CC.
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