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A study of the clad alloy 625 deposited by HIP and weld overlay on 4130 and 21/&r-1Mo steels was conducted to evaluate the effect of cladding process on microstructure, mechanical, corrosion and stress corrosion cracking (SCC) properties relating to sour gas production service. The results showed that the microstructure of the clad and interface produced by the two cladding processes are considerably different and had a direct effect on the properties. The clad produced by HIP had a homogenous structure which showed superior resistance to pitting, hydrogen disbond and SCC. In contrast, the HIP process resulted in a high concentration of coarse carbides resulting in poor mechanical properties of the clad/steel interface properties than in the weld clad. The segregated cast structure of the weld overlay alloy 625 contributed to the reduced resistance to corrosion and SCC of the weld clad compared to HIP clad. The weld clad interface also had fewer carbides which provided good mechanical integrity. Analysis of the microstructural characteristics and properties of the two clad materials are presented.

Relationship of Microstructure to Properties of HIP and Weld Clad Alloy 625 in Sour Environments