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Grain size is a scale representing grain size. Common expression methods include the number of grains per unit volume (zv), the number of grains per unit area (ZS) or the average line length (or diameter) of grains.

A measure of grain size is called grain size. Grain size is usually evaluated or determined by different methods such as length, area, volume or number of grain size grades. The grain size expressed by the number of grain size grades is independent of the measurement method and unit of measurement.

The actual grain size refers to the austenite grain size obtained by steel under specific heat treatment or hot working conditions. The actual grain size basically reflects the grain size obtained under the actual heat treatment or hot working conditions of steel parts, and directly affects the microstructure and properties of products obtained after steel cooling. The grain size usually refers to the actual grain size unless otherwise specified.

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