Abstract
Study of the nonmetallic phase of unalloyed tube steel 10G2FB has shown that the steel contains four types of nonmetallic inclusions. Relatively fine (no coarser than 12 µm) calcium aluminates of variable composition are the main type of nonmetallic inclusion (NI) in such steel. It was established that a decrease in the point rating for NI contamination of the steel from 3.5 to 1.5 leads to an increase in the steel’s impact toughness from 235 to 318 J/cm2.
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