hello, i'm new here, and i'm looking for some information. i need to modified a bit the mechanical properties of the P91, because we have a high yield and tensile points, but the elongation is close to the minimum according to ASTM A 335 20%. We have modified the Tempering temperature to the ASTM limit 800ºC, so close to the AC1, and increased the time.. but any recomendation about the chemical composition? I know our carbon content is high around 0.11/0.115, but they dont want to modified it because in the pass with lower carbons they had problems during the rolling process. So what other elements (V, Mo, Cr)can i modified to decrease the hardness in our pipes? any suggestion? thank you so much in advance.
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