The invention discloses a production method of NR400ZL
steel plates used for equipment converter shells. The production method comprises the procedures including steel-making,
continuous casting, heating, rolling and heat treatment. According to the production method, by limiting the contents of the element components of C and Si, by controlling the steel
ladle baking temperature and C content ofthe converter steel making process and controlling the white
slag holding time and vacuum soft blowing time of the LF refining process, by adopting protective
casting and controlling the steel plate rolling process and return-red temperature, the obtained
steel plates are good in compactness, high in strength and good in
welding performance, the steel plate thickness is 60-160 mm, the steel plateyield strength is greater than or equal to 320 MPa, the tensile strength is greater than or equal to 420 MPa, the
ductility is greater than or equal to 24%, 0 DEG C
impact force is greater than or equal to 60 J, the 350 DEG C high-temperature tensile strength is greater than or equal to 230 MPa, standards and safety requirements are met completely, and the production method meets requirements forsteel used for the equipment converter shells.