Non-oriented electrical steel for variable-frequency air conditioner and manufacturing method of non-oriented electrical steel

Abstract

The invention provides non-oriented electrical steel for a variable-frequency air conditioner and a manufacturing method of the non-oriented electrical steel. The non-oriented electrical steel is prepared from the components: less than or equal to 0.0020% of [C], 0.20%-0.50% of [Mn], less than or equal to 0.0025% of [S], less than or equal to 0.020% of [P], 2.80%-3.4% of [Si], 0.20%-1.20% of [Al],less than or equal to 0.0025% of [N], 0.01-0.10% of [Sn], the balance of Fe and inevitable residual elements. The manufacturing method comprises the steps: steelmaking, continuous casting, heating, hot rolling, normalizing, acid pickling, cooling, annealing, cooling and coating. The product thickness is 0.25-0.30 mm, the product iron loss P1.5 / 50 is less than or equal to 2.15 W / kg, the magnetic polarization intensity J5000 is greater than or equal to 1.65 T, the magnetizing velocity is high, the iron loss is low, the non-oriented electrical steel is suitable for the working conditions of a compressor of the variable-frequency air conditioner, the size and the weight of the variable-frequency air conditioner can be reduced, power consumption is reduced, and resources and energy are saved.

Description

technical field [0001] The invention belongs to the field of alloy smelting, and in particular relates to a non-oriented electrical steel for frequency conversion air conditioners and a manufacturing method thereof. Background technique [0002] The manufacturing process of non-oriented electrical steel is long, the process is complex, and there are many factors affecting product quality. In particular, the compressors of inverter air conditioners are used frequently, the frequency changes greatly during use, and the working conditions are complicated. The requirements for electromagnetic properties, thickness, and shape of non-oriented electrical steel are high. [0003] The application number published on July 20, 2011 is 201110008574.X "A method for manufacturing cold-rolled non-oriented electrical steel for inverter air conditioners", and its main chemical components are [Si]0.5%-1.0%, [Al]0.1-0.5 %, product iron loss P 10 / 400 ≤25W / kg, P 10 / 1000 ≤110W / kg, the annealin...

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Problems solved by technology

In the existing documents, no thickness of 0.25-0.30mm, iron loss P 1.5 / 50 ≤2.15W / kg non-oriented electrical steel and its manufacturing method

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