12Cr2Mo1VR steel plate with low compression ratio and high flaw detection quality requirement for continuous casting billet forming and production process

The invention relates to a production process of 12Cr2Mo1VR with low compression ratio and high flaw detection quality requirement for continuous casting billet forming. The process route comprises converter steelmaking, LF refining, RH vacuum degassing, continuous casting, continuous casting billet heating, rolling, slow cooling, quenching and tempering, and the steel plate comprises the following chemical components in percentage by mass: 0.09-0.17% of C, less than or equal to 0.30% of Si, 0.30-0.60% of Mn, less than or equal to 0.012% of P, less than or equal to 0.010% of S, 2.00-2.50% of Cr, 0.80-1.20% of Mo, 0.25-0.35% of V, less than or equal to 0.003% of Sb, less than or equal to 0.010% of Sn, less than or equal to 0.010% of As and the balance of Fe and inevitable impurity elements. According to the low-compression-ratio continuous casting process, on the premise that the 12Cr2Mo1VR steel plate with the high flaw detection requirement is obtained, the blank yield reaches 89% or above and is greatly imp