Magnetization-free electromagnetic pure iron with high bending resistance and manufacturing method thereof

Abstract

The invention discloses magnetization-free electromagnetic pure iron with high bending resistance. The micro structure is ferrite; the magnetization-free electromagnetic pure iron contains impurities;the average crystal grain size of the ferrite ranges from 50 to 70<mu>m, and the volume fraction of the ferrite with the grain size larger than 50<mu>m is higher than 60%; the impurities belong to anAl2O3-Mn system; the area percentage of the Al2O3 impurities is lower than 0.004%, and the area percentage of the MnS impurities is lower than 0.0015%. The invention also discloses a manufacturing method of the magnetization-free electromagnetic pure iron. The magnetization-free electromagnetic pure iron is low in low coercive force and high in bending resistance, the hardness ranges from 90 to 130Hv, the yield strength along the rolling direction is 200MPa or higher, the tensile strength is 300MPa or higher, and the elongation percentage (A50) is 32% or higher.

Description

technical field [0001] The invention relates to an electromagnetic pure iron and a manufacturing method thereof, in particular to a magnetization-free electromagnetic pure iron and a manufacturing method thereof. Background technique [0002] Compared with Ni-Fe, silicon steel, Fe-Co and ferritic stainless steel materials, electromagnetic pure iron has lower coercive force, low cost, excellent formability and weldability, so it has a wide market demand as a strong magnetic shielding material . [0003] In the prior art, cold-rolled electromagnetic pure iron products leave the factory in an annealed state. When users use them, they need to undergo magnetization annealing treatment after processing and forming to eliminate cold-worked lattice distortion, so as to fully exert pure ferromagnetic properties. According to the national standard GB / T 6983-2008, the electromagnetic pure iron magnetization annealing process is as follows: when vacuum or inert gas protection annealing...

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Problems solved by technology

[0004] However, the above-mentioned processes have the following defects: the magnetization annealing process cycle is long, the annealing equipment requirements are high, and the output is limited by the amount of furnace loading, which prolongs the production and processing cycle of the product and increases the cost.

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