| 简介 |
FIELD : non-oriented electrical steels used for manufacture of magnetic cores for motors and similar equipment; methods of manufacture of such sheets.
SUBSTANCE : sheet is made from steel containing the following constituents, mass-% : carbon, up to 0.01; silicon, from 0.1 to 7.0; aluminum, from 0., 1 to 3.0; manganese, from 0.1 to 2.0; rare-earth metals, from 0.0003 to 0.05; titanium, up to 0.02; sulfur, up to 0.005 and nitrogen, up to 0.005; the remainder being iron and unavoidable admixtures, provided the following equation is satisfied : log({Ti]x[N]) - 1.9xlog([Al]x[N]) + 1.84>0, where [Ti]is content of titanium, mass-%; [N] is content of nitrogen, mass-% and [Al] is content of aluminum, mass-%. Density of distribution of inclusions contained in said steel sheet at volume equivalent diameter lesser than 100 nm is 10x1010 [1/mm3] or lesser. Method of manufacture of steel sheet includes stage of holding the sheet at temperature of from 1200 to 1300°C for a minute and more. Steel has large grains which is sufficient for reduction of losses in core even at low-temperature annealing and during short period of time after stamping.
EFFECT : enhanced efficiency.
5 cl, 5 dwg, 2 tbl |
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