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Cold pilgered and cold drawn tubes of 22Cr austenitic ferritic and 28Cr superaustenitic stainless steel were used to evaluate the effect of different cold working methods on localized corrosion and stress corrosion resistance in environments containing chlorides and sulphides. It has been found that both material work hardening and residual stresses induced by cold working procedures affect the corrosion performance of the final product. Work hardening negatively affects localized corrosion resistance. On the contrary work hardening does not have a considerable influence on stress corrosion resistance. The measurements of residual stressed by neutron diffraction have shown that while drawn tubes presented compressive residual stress on the inner surface, pilgered tubes showed low tensile tangential stresses. Therefore, drawn tubes can be successfully used for oil extraction. In such an application tubes undergo heavy tangential and axial tensions due to the weight of extracting column and to fluid pressure. If the inner surface, in contact with aggressive fluids, is compressed by residual stresses, these residual stresses relieve the external ones and the material is less subject to stress corrosion.

Additional information

Authors: BARTERI M, Centro Sviluppo Materiali SpA, Roma (IT);MECOZZI M G, Centro Sviluppo Materiali SpA, Roma (IT)
Bibliographic Reference: EUR 15708 IT (1996) 50pp., FS, ECU 10
Availability: Available from the (2)
ISBN: ISBN 92-827-6459-1
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