Continuous casting production technology for producing wide and thick-cross section pipeline steel casting blank

The invention discloses a continuous casting production technology for producing a wide and thick-cross section pipeline steel casting blank. The continuous casting production technology comprises thefollowing steps of (1) online baking-(2) casting process-(3) employing overall-protection casting during continuous casting-(4) main components of casting powder laid on the surface of molten steel in a crystallizer-(5) steel casting process. Aiming at the technical problems of flow field bias and slag entrapment of the crystallizer, low flaw detection eligibility rate of a casting blank rolled steel plate, and the like when wide and thick-cross section pipeline steel is cast, the invention provides the continuous casting production technology for producing the wide and thick-cross section pipeline steel casting blank in order to overcome the disadvantages of the prior art; by adjusting an upper nozzle structure and a lower nozzle structure of a tundish and the viscosity of the casting powder, the 'slag entrapmen