It is shown that stress-corrosion damage of welded gas-main pipes is mainly due to the changes in structural and mechanical characteristics of metal (especially, impact toughness) in a narrow heat-affected zone. This results in a decrease in the resistance to stress-corrosion cracking (SCC) of steel under operational conditions. An increase in the resistance to SCC for ferrite-pearlite steel can be achieved by their subcritical annealing or normalization.
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