A kind of grain-oriented silicon steel capable of reducing surface hardness and its preparation method

Abstract

The invention relates to oriented silicon steel capable of reducing surface hardness. The oriented silicon steel comprises, by weight, components of 0.015%-0.095% of C, 2.80%-3.60% of Si, 0.020%-0.035% of Als, 0.0050%-0.0100% of N, 0.010%-1.00% of Mn and 0.0030%-0.03% of S. The preparation method comprises steps of casting into a blank after smelting; performing low-temperature or high-temperaturehot rolling; coiling after conventional cooling; primary cold rolling; decarburizing and annealing; nitriding treatment; coating high-temperature annealing separant to remove a magnesium silicate bottom layer; carrying out high-temperature annealing by adopting a secondary heat preservation mode; stretching, flattening and annealing; and coating semi-organic insulating coating and conventionallydrying. The oriented silicon steel is advantaged in that on the premise that the magnetic induction intensity B800 is larger than or equal to 1.83 T and the magnetic induction intensity P17 is smallerthan or equal to 1.50 W / kg, the magnesium silicate layer can be eliminated, the surface hardness HV 0.5 of the steel plate does not exceed 130 by coating semi-organic insulating paint, and the numberof punching sheets of a cutting die at a time is increased by 5-12 times compared with that of existing varieties.

Description

technical field [0001] The invention relates to a cold-rolled oriented silicon steel and a preparation method thereof, and specifically belongs to an oriented silicon steel capable of reducing surface hardness and a preparation method thereof. Background technique [0002] In the manufacturing process of generator motors, in order to improve the iron loss of the iron core and reduce the energy consumption of the product, the customer plans to develop and use oriented silicon steel instead of non-oriented silicon steel to manufacture the stator core, so as to improve the magnetic permeability of the yoke and teeth. In terms of magnetic performance, it is required that the typical magnetic induction design value can reach more than 1.7T, so that the grain-oriented silicon steel has complete advantages. In terms of mechanical properties, the rolling tensile strength is required to reach 350N / mm2, and the bigger the better, so the thicker the grain-oriented silicon steel is (the...

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Problems solved by technology

Although the quality of the product obtained in this document is good, it can meet the needs of high magnetic induction oriented silicon steel for transformer cores, but it also does not solve the problems existing between the coating and the steel base interface (the surface is a traditional oriented silicon steel magnesium silicate bottom layer+ T2 tension coating mode, the surface hardness of the steel plate is high, which is not conducive to stamping processing)

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