Abstract
Drill pipes are subjected in service to aggressive environment (a wide range of drilling muds) and to a combination of high static and dynamic loads. Under such conditions, the high-strength steel is susceptible to various forms of environmental cracking, particularly to corrosion fatigue. The fatigue life of type 40Cr steel in salt drilling muds was studied with a self-made rotating bending corrosion fatigue testing apparatus. Environmental variables investigated included stress, frequency, temperature, and pressure of carbon dioxide. Experimental results show that carbon dioxide promotes the fatigue crack of 40Cr steel. These tests were supported by electrochemical corrosion measurements and hydrogen permeation.
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