March 2016, Vol. 243, No. 3

Features

Considering Corrosion Allowances for High-Strength Steels

Due to great chemistry and metallurgical innovations of the steel industry, higher strength steels have made significant strides, in specified minimum yield strength (SMYS), wall thickness control, toughness and weight per foot. However, one significant factor in these great improvements was no consideration for corrosion allowances. It has decreased with every incremental increase in the making of higher strength steels. Corrosion in carbon steel is the same whether it is a 35,000-yield pipe or an 80,000-yield pipe or 0.375-inch wall thickness (WT) vs. 0.215-inch wall thickness. Wall loss of 25% on 35,000-yield pipe results in a 44% on the higher strength steel pipe. Lower strength steel

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