Abstract: The thermodynamic software JMat Pro was used to calculate the density, resistivity, specific heat capacity, and thermal conductivity of non-oriented silicon steel with varying contents of Si (3.0 %~3.6 %), Al (0.5 %~1.5 %), and Mn (0.3 %~0.9 %). The effects of Si, Al, and Mn contents on the physical properties of non-oriented silicon steel were analyzed. The results indicate that within the temperature range of 25~500 ℃, the density of non-oriented silicon steel decreases with increasing element content. For example, at 300 ℃, when the Al content increases from 0.5 % to 1.5 % while maintaining Si and Mn contents at 3 % and 0.3 %, respectively, the density decreases by 0.8 %; when the Si content increases from 3.0 % to 3.6 % while keeping Al and Mn contents at 0.8 % and 0.3 %, respectively, the density decreases by 0.53 %; and when the Mn content increases from 0.3 % 
to 0.9 % while maintaining Si and Al contents at 3 % and 0.8 %, respectively, the density changes are negligible. Regarding resistivity, at 
300 ℃, the Al content has the most significant impact, with a resistivity increase of 16.42 % when it increases from 0.5 % to 1.5 %; the Si content increases by 5.63 % when it rises from 3.0 % to 3.6 %, whereas the Mn content only causes a 2.82 % increase in resistivity. Specific heat capacity gradually increases with temperature within the range of 25~700 ℃. For example, at 300 ℃, the specific heat capacity increases by 0.52 % when the Si content rises from 3.0 % to 3.6 %, and by 1.04 % when the Al content increases from 0.5 % to 1.5 %, while the increase is only 0.35 % for Mn content rising from 0.3 % to 0.9 %. Thermal conductivity exhibits clear temperature dependent behavior: within the range of 0~800 ℃, it decreases significantly with increasing temperature due to higher Si and Al contents; however, there is no significant change in the 800~1 400 ℃ range, and Mn content variations do not show a strong correlation with changes in thermal conductivity.

Key words: non-oriented silicon stee, density, specific heat capacity, Thermal conductivity