Welcome, @EJian.1, to the community!
The STM32F301K8U7 has the marking F301K87 (not F3018K7).
The marking F301K8 (not F3018K) stands for the STM32F301K8U6, i.e. the temperature range of -40...+85°C instead of -40...-105°C.
Does it answer your question?
Regards
/Peter
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