Duplex alloy of stainless steel resistant to the formation of surface craters with improved machinability

摘要

Invention Patent: B "DUPLEX ALLOY OF STAINLESS STEEL RESISTANT TO THE FORMATION OF SURFACE CRATERAS WITH IMPROVED USINABILITY" D. a duplex alloy of stainless steel highly resistant to the formation of surface craters is provided, which comprises in weight percentages: C: 0.10% and below; Si: 1.5% and below; Mn: 2.0% and below; Cr: 25.0% to 27.0%; Ni: 5.0% to 7.5%; Cu: 1.5% to 3.5%; N: 0.15% and below; Mo: 0.5% and below; and the remainder being substantially iron and unavoidable impurities. This alloy has greatly improved machinability, when treated in the mold, after casting, by an accelerated heat treatment, when compared with the same alloy composition, which is cooled under control very slowly in an airtight heat treatment furnace.