Influence of composition and hot rolling parameters on the magnetic and mechanical properties of fully processed non-oriented low-Si electrical steels

The influence of composition (Si, Al, Mn, P and B) and hot rolling parameters on the properties of fully processed ultra-low carbon, low Si, non oriented electrical steels was investigated. Nine steels were examined. using twelve combinations of slab reheating temperature, finishing temperature and coiling temperature. It was found that maximisation of the polarisation through composition generally causes an increase in core losses. Hot band and final grain size influence the magnetic and mechanical properties more than composition. The grain boundary segregation of P results in finer grains and lower polarisations. Increasing the Mn and/or Al content coarsens the final grains as a result of coarser MnS and/or AIN precipitates