In practice, SCC-initiated failure cases are noted of hot potable and heating water tubes
[5–7]. The tubes are usually made of deoxidized high phosphorous copper (Cu-DHP) in
annealed or cold worked temper. The common ammonia and nitrite ions are described
to cause SCC, acting with residual stresses from the tube production, mechanical forming
process and/or stresses resulting from internal pressure. Cracks, mainly intergranular,
always start from the outer surface and propagate perpendicularly to the surface, predominantly in parallel to the tube axis.