Influence of boron on strain hardening behaviour and ductility of low carbon hot rolled steel

The beneficial effect of boron on mechanical properties of low carbon Al-killed steel has been reported in recent past. However, the effect of boron on strain hardening exponent (n) and ductility has not been fully understood. This aspect has been discussed in present work. The results of mill trials with reference to n and ductility with boron added steel are compared to those for commercial grade. The lowering of ‘n’ with increased total elongation in boron bearing steel has been related to the microstructural evolution as a result of boron addition.

► Unique feature of low strain hardening exponent (n) with high total elongation has been discussed in industrially produced low carbon boron containing steel.
► n has been correlated with the micro structural changes occurring during deformation of steel.
► This feature of low n and high % elongation has potential for higher cold reducibility.
► The work is being reported for the first time on industrially produced low carbon boron containing steel.