BS970 709M40 steel belongs to ultra-high strength steel, which has high strength and toughness, good hardenability, no obvious temper brittleness, high fatigue limit and multiple impact toughness after quenching and tempering, and good low temperature impact toughness. Steel is suitable for manufacturing large and medium-sized plastic molds that require certain strength and toughness.
The chemical composition of BS970 709M40 is as follows: