METHOD OF MANUFACTURING ITEMS FROM LIGHT AUSTENITIC STRUCTURAL STEEL AND ITEM FROM LIGHT AUSTENITIC STRUCTURAL STEEL (VERSIONS)

摘要

FIELD: metallurgy.SUBSTANCE: invention relates to a manufacturing method of items from light austenitic structural steel with variable material properties in the item wall thickness direction with the following composition, wt %: C 0.2 to ?1.0, Al 0.05 to<15.0, Si 0.05 to ?6.0, Mn 9.0 to<30.0, iron and inevitable impurities are the rest with addition, when necessary, of Cr?6.5, Cu?4.0, Ti+Zr?0.7, Nb+V?0.5, B?0.1.EFFECT: item is subject to decarburising annealing in an oxidising atmosphere, which provides for formation of a ferrite or metastable austenitic structure in near-surface areas of the specified thickness of the layer and properties.18 cl, 1 dwg, 1 tbl