Gamma-genes effects of the copper in the 18Cr8Ni stainless steels
Keywords:Austenitic stainless steels, δ-ferrite, Nickel equivalent of the copper
From a series of 22 typical 18Cr8Ni stainless steel 40 kg ingots, with copper variable concentrations from 0.6 to 3.0 weight %, δ-ferrite is measured with a ferrite-meter device, calculating a nickel equivalent of 0.27 for copper. Some differences between the 8-ferrite and that on calculated by DeLong -excluding the copper γ-gene action- have been found because of different solidification and cooling regimes in ingot and weld cases.
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