Method for improving bonding of middle-grade non-oriented silicon steel after stress relief annealing
By optimizing the alloy composition, substrate surface roughness and annealing conditions of silicon steel, the serious bonding of medium-grade non-oriented silicon steel after stress annealing is solved, and the pass rate of iron loss of iron core is improved.
CN119464891APending Publication Date: 2025-02-18SHANXI TAIGANG STAINLESS STEEL CO LTD
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Patent Information
- Application Number
- CN202411298378.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-18
- Publication Date
- 2025-02-18
AI Technical Summary
Technical Problem
The medium-grade non-oriented silicon steel is severely bonded after stress annealing, resulting in a low pass rate of iron loss of the iron core and affecting the magnetic performance of the transformer and motor.
Method used
By optimizing the alloy composition, adjusting the mechanical strength of silicon steel and substrate surface roughness, controlling the oxidation atmosphere ratio and temperature, and appropriately increasing the thickness of the silicon steel coating to reduce burrs and bonding after punching.
Benefits of technology
The bonding degree of medium-grade non-oriented silicon steel after stress annealing was significantly improved, and the iron loss pass rate of iron core increased from 35% to 100%.
✦ Generated by Eureka AI based on patent content.
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Figure CN119464891A_ABST
Abstract
The method comprises the steps that alloy components are optimized, the mechanical strength of the silicon steel is adjusted, burrs generated after punching are reduced, one or a combination of two of Si and AI elements in the silicon steel in a certain proportion is adjusted, the Si content is controlled to be 1.50%-1.90%, and the AI content is controlled to be 0.20%-0.40%; the surface roughness of the substrate is optimized, and the surface roughness Ra of the substrate is controlled to range from 0.20 micrometers to 0.55 micrometers; the oxidizing atmosphere proportion and the temperature are controlled, the oxidizing atmosphere proportion is controlled to be 5%-30%, and the annealing temperature is controlled to be 720-780 DEG C; and the thickness of the silicon steel coating is controlled, and the thickness of the silicon steel coating is controlled to range from 0.1 micrometer to 0.6 micrometer. The alloy components are optimized, the mechanical strength of the silicon steel is adjusted, and burrs generated after sheet punching are reduced; the surface roughness of the base plate is optimized, the thickness of the silicon steel coating is properly increased, the oxidizing atmosphere proportion and temperature during stress relief annealing are reduced, and the iron core iron loss qualification rate is increased to 100% from 35%.
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