Abstract
1. The addition of small amounts of nitrogen (0.02–0.03%) and nitride-forming elements (titanium and chromium) to low-alloy steel 20G has a substantial effect on the mechanical properties. 2. The addition of ∼0.2% Ti and 0.02% N substantially increases the strength characteristics in the hot-rolled and normalized conditions. In the hot-rolled condition the plastic properties and impact strength are reduced, but increase after normalization. 3. The addition of ∼1.0% Cr and ∼0.02–0.03% N noticeably improves the strength properties; the plastic properties and impact strength remain unchanged. 4. Alloying 20G steel with chromium (∼1.0%) and nitrogen (∼0.02%) is not recommended.
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