Table 2 Oil tube corrosion pit depth measurements and pitting corrosion rates (oil tube downhole in September 2020, dumping from January 2024, total 3.33 years).

From: Failure analysis of 3Cr oil pipe body fracture

Corrosion pit location

Corrosion pit depth (mm)

Pitting corrosion rate (mm/a)

1# corrosion pit

0.479

0.144

2# corrosion pit

0.785

0.236

3# corrosion pit

0.287

0.086

4# corrosion pit

0.331

0.099

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