9Ni steel plate residual magnetism control manufacturing method

Abstract

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.

Description

technical field [0001] The invention relates to the field of magnetic protection of alloy hot-rolled steel plates in the metallurgical industry, in particular to a manufacturing method for 9Ni steel plate remanence control. Background technique [0002] In actual production, 9Ni steel is easy to generate residual magnetic field under external interference, and the size and law of the residual magnetic field are closely related to the basic magnetic parameters of the material itself. There are four main magnetic parameters that affect the residual magnetic field of materials: magnetic permeability, residual magnetic induction, saturation magnetic induction, and coercive force. [0003] There is a certain relationship between the remanence of the steel plate and the magnetic properties of the 9Ni steel itself, but the main reason is the influence of the external environment, mainly the influence of the magnetic environment. [0004] 9Ni steel contains a large amount of magnet...

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Problems solved by technology

[0010] The magnetic requirement of 9Ni steel plate abroad is no more than 50 Gauss, but there is no clear report on the control of steel plate magnetism

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