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Corrosion of Weldments J.R. Davis
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When there is a danger of corrosion in the heat-affected zones of weldments, the low-carbon variety SX 316L should be used. Best alloy to use as universal weld filler metal to resist corrosion of weldments. Weldments subjected to corrosive attack over a period of time may crack adjacent to welds if the residual stresses are not removed. Outstanding resistance to localized corrosion and excellent resistance to stress corrosion cracking. Steel welded to low alloy steel. Stress relieving of martensitic or ferritic stainless steel weldments will simultaneously temper weld and heat affected zones, and for most types will restore corrosion resistance to some degree. Certain magnesium alloys are subject to stress corrosion. If the flow lines are welded, the operator should be certain that the weldments are at least as corrosion resistant (and where H2S is present, as cracking resistant) as the pipe body. Stress Corrosion Cracking Locations. SX 316 also possesses excellent mechanical and corrosion properties at sub-zero temperatures. REACTORS: All weldments; circumferential welds by which nozzles are attached; radius of dished head; external jackets especially half-pipe coils.