STEEL FEATURING HIGH IMPACT STRENGTH IN HEAT-AFFECTED ZONE IN WELDING Russian patent published in 1999 - IPC

FIELD: steels featuring high impact strength in heat-affected zone used for ships, buildings, autoclaves, main pipelines, etc. SUBSTANCE: steel presents alloy of Ti-Mg-O system containing at least 40 particles/sq.mm of oxides and combined Ti and Mg oxides sizing from 0.001 to 5.0 mcm. Steel contains the following components, mas.%: carbon, 0.01-0.15; silicon, no more 0.6; manganese, 0.5-2.5; phosphorus, no more 0.030; sulphur, no more 0.005; titanium, 0.005-0.025; aluminum, no more, 0.02; magnesium, 0.0001-0.0010; oxygen, 0.001-0.004; nitrogen, 0.001-0.006; iron, the balance. EFFECT: higher impact strength and increased safety of structures made of claimed steel. 3 cl, 4 tbl