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ferriitterase, sealhulgas normaliseeritud (normaliseeritud valts-) terase ning välja arvatud peeneteraline terase ja spetsiaalselt kuumtöödeldud terase puhul, re/t ja rm/20 arvväärtusest,
in the case of ferritic steel including normalized (normalized rolled) steel and excluding fine-grained steel and specially heat-treated steel, of re/t and 5/ of rm/20;