The invention discloses a 9Ni steel plate residual
magnetism control manufacturing method. The method comprises the following steps that (1) the
mode of transport of the
steel plates of all the processes after
quenching all adopts vacuum suction cups for hoisting; (2)
quenching treatment is conducted, specifically, according to the characteristic that the
steel plates lose
magnetism after being heated to the
Curie point temperature of 770 DEG C, the steel plate
quenching temperature is 800+ / -30 DEG C; (3)
tempering treatment is conducted, specifically, the steel plate
tempering temperature is630+ / -20 DEG C; (4) steel plate stacking is conducted, specifically, the
steel plates after heat treatment are all stacked at the stacking position in the distance of 50 meters away from a heat treatment furnace; (5) residual
magnetism measurement is conducted, specifically, all the steel plates are subjected to residual magnetism measurement before delivery; and (6)
degaussing treatment is conducted, specifically, when the steel plate residual magnetism is greater than 30 Gauss, the steel plates are subjected to
degaussing treatment. By means of the 9Ni steel plate residual magnetism controlmanufacturing method, each process after quenching treatment adopts the vacuum suction cups for hoisting to ensure the lower magnetic properties of the steel plates, the magnetic properties of each process are controlled to be free from external
pollution, by measuring the residual magnetism of the key processes, the residual magnetism monitoring of the whole process of the steel plate productionis guaranteed, and the qualified steel plates are provided.