Substructural features of hardened low-alloy steel with boron

1. Hardening without tempering of low-alloy, low-carbon steel with microadditions of boron may provide a satisfactory combination of strength, ductility, and impact strength. 2. The high level of mechanical properties of the test steel with the strengthening treatment used was achieved with presence in its structure as the main component of acicular ferrite with a high dislocation density within laths and with a high level of ferrite grain fragmentation.