Prior work showed that the Ni-Cr-Mo alloys UNS N06058 and UNS N06059 can be reliably explosion clad to carbon steel and are fully compliant with ASME Code. Additionally, corrosion tests in hydrochloric and sulfuric acid, in “green death solution” and further mechanical tests according to SA 265 (Nickel and Nickel-Base Alloy-Clad Steel Plate) have been conducted.

To fabricate equipment such as pressure vessels, explosion cladding is followed by shell and head forming. If requested by the codes, a post weld heat treatment may also be mandatory. After this sequence, the clad bond zone layer has been investigated with respect to mechanical properties and corrosion resistance.

Therefore, best practices for explosive cladding and head forming were identified and evidence was provided that the explosive cladding process does not affect the above-mentioned properties of Ni-Cr-Mo materials. The effect of the post weld heat treatment on the corrosion properties in hydrochloric and sulfuric acid was also investigated and differences between alloy UNS N06058 and alloy UNS N06059 could be detected.

Subject
Materials, Corrosion resistant alloys, Corrosion rate, Sulfuric acid, Mass loss, Nickel chromium molybdenum alloys, Welding, Inspection, Explosions, Sensitization, Corrosion resistance, Alloys, Heat treatment
Keywords:
explosion cladding, explosion welding, Ni-Cr-Mo alloys, UNS N06058, UNS N06059, corrosion resistance, heat treatment, thermal stability, sensitization, shear strength
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2022
Association for Materials Protection and Performance (AMPP)
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