Low-carbon high-titanium high-chromium steel sheet billet and production method thereof

The invention provides a low-carbon high-titanium high-chromium steel sheet billet and a production method thereof. The low-carbon high-titanium high-chromium steel sheet billet comprises the following chemical components in percentage by mass: more than or equal to 0.04 wt% and less than or equal to 0.065 wt% of C, more than or equal to 0.1 wt% and less than or equal to 0.3 wt% of Si, more than or equal to 0.4 wt% and less than or equal to 0.8 wt% of Mn, more than or equal to 0.2 wt% and less than or equal to 0.4 wt% of Cu, more than or equal to 0.07 wt% and less than or equal to 0.15 wt% of Ti, more than or equal to 2 wt% and less than or equal to 3 wt% of Cr, less than or equal to 0.008 wt% of N and the balance of iron and other inevitable impurities. Compared with the prior art, the content of Ti is 0.07-0.13 wt%, the size of inclusions is small, original austenite grains in a plate blank are fine, and favorable conditions are provided for stably rolling high-strength and ultra-thin hot rolled coils. Acco