Title: A double cold rolled non-oriented electrical steel and a method of manufacturing non-oriented electrical steel thereof

Abstract: The invention deals with a double cold rolled non-oriented electrical steel sheet having a composition comprising of the following elements, expressed in percentage by weight: 0.0001% â¿¤ Carbon â¿¤ 0.007 % 0.1% â¿¤ Manganese â¿¤ 0.2% 3.1% â¿¤ Silicon â¿¤ 3.6% 0.8% â¿¤ Aluminum â¿¤ 1.1% Phosphorus â¿¤ 0.15 % Sulfur â¿¤ 0.006% Nitrogen â¿¤ 0.09% and can contain one or more of the following optional elements 0% â¿¤ Niobium â¿¤ 0.1% 0% â¿¤ Titanium â¿¤ 0.1% 0% â¿¤ Vanadium â¿¤ 0.1% 0% â¿¤ Chromium â¿¤ 1% 0% â¿¤ Molybdenum â¿¤ 0.5% 0% â¿¤ Tungstenâ¿¤ 0.1% 0% â¿¤ Cobalt â¿¤ 1% 0% â¿¤ Arsenic â¿¤ 0.05% 0.001% â¿¤ Calcium â¿¤ 0.01% 0% â¿¤ Copper â¿¤ 1% 0.001% â¿¤ Nickel â¿¤ 0.01 0 % â¿¤ Boron â¿¤ 0.05% 0 % â¿¤ Lead â¿¤ 0.2% 0% â¿¤ Tinâ¿¤ 0.2% 0% â¿¤Antimony â¿¤ 0.2% the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel sheet being made of ferrite and comprising in area fraction, 80% to 100% recrystallized microstructure, 0% to 20% non-recrystallized microstructure wherein the average grain size of recrystallized microstructure is from 20 microns to 110 microns and having a percentage of eddy current losses in total iron losses, measured at 1 T and 400 Hz according to IEC 60404-2 standards, is from 35% to 45% when calculated in accordance of Bertotti method and simultaneously having a magnetic polarization at 5000A/m (J50) from 1.64T to 1.66T.The invention deals with a double cold rolled non-oriented electrical steel sheet having a composition comprising of the following elements, expressed in percentage by weight: 0.0001% â¿¤ Carbon â¿¤ 0.007 % 0.1% â¿¤ Manganese â¿¤ 0.2% 3.1% â¿¤ Silicon â¿¤ 3.6% 0.8% â¿¤ Aluminum â¿¤ 1.1% Phosphorus â¿¤ 0.15 % Sulfur â¿¤ 0.006% Nitrogen â¿¤ 0.09% and can contain one or more of the following optional elements 0% â¿¤ Niobium â¿¤ 0.1% 0% â¿¤ Titanium â¿¤ 0.1% 0% â¿¤ Vanadium â¿¤ 0.1% 0% â¿¤ Chromium â¿¤ 1% 0% â¿¤ Molybdenum â¿¤ 0.5% 0% â¿¤ Tungstenâ¿¤ 0.1% 0% â¿¤ Cobalt â¿¤ 1% 0% â¿¤ Arsenic â¿¤ 0.05% 0.001% â¿¤ Calcium â¿¤ 0.01% 0% â¿¤ Copper â¿¤ 1% 0.001% â¿¤ Nickel â¿¤ 0.01 0 % â¿¤ Boron â¿¤ 0.05% 0 % â¿¤ Lead â¿¤ 0.2% 0% â¿¤ Tinâ¿¤ 0.2% 0% â¿¤Antimony â¿¤ 0.2% the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel sheet being made of ferrite and comprising in area fraction, 80% to 100% recrystallized microstructure, 0% to 20% non-recrystallized microstructure wherein the average grain size of recrystallized microstructure is from 20 microns to 110 microns and having a percentage of eddy current losses in total iron losses, measured at 1 T and 400 Hz according to IEC 60404-2 standards, is from 35% to 45% when calculated in accordance of Bertotti method and simultaneously having a magnetic polarization at 5000A/m (J50) from 1.64T to 1.66T. The invention deals with a non-oriented electrical steel sheet having a composition comprising of the following elements, expressed in percentage by weight: 0.0001% â¿¤ Carbon â¿¤ 0.007 % 0.15% â¿¤ Manganese â¿¤ 0.25% 2.9% â¿¤ Silicon â¿¤ 3.4% 0.7% â¿¤ Aluminum â¿¤ 1.3 % 0.05% â¿¤ Nickel â¿¤ 1% Phosphorus â¿¤ 0.15 % Sulfur â¿¤ 0.006% Nitrogen â¿¤ 0.09% with 3.85% â¿¤ Si+Al+Mn â¿¤ 5.5% and can contain one or more of the following optional elements 0% â¿¤ Niobium â¿¤ 0.1% 0% â¿¤ Titanium â¿¤ 0.1% 0% â¿¤ Vanadium â¿¤ 0.1% 0% â¿¤ Chromium â¿¤ 1% 0% â¿¤ Molybdenum â¿¤ 0.5% 0% â¿¤ Tungstenâ¿¤ 0.1% 0% â¿¤ Cobalt â¿¤ 1% 0% â¿¤ Arsenic â¿¤ 0.05% 0.001% â¿¤ Calcium â¿¤ 0.01% 0% â¿¤ Copper â¿¤ 1% 0 % â¿¤ Boron â¿¤ 0.05% 0 % â¿¤ Lead â¿¤ 0.2% 0% â¿¤ Tinâ¿¤ 0.2% 0% â¿¤Antimony â¿¤ 0.2% the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel sheet being made of ferrite and comprising in area fraction, 80% to 100% recrystallized microstructure, 0% to 20% non-recrystallized microstructure wherein the average grain size of recrystallized microstructure is from 20 microns to 110microns and having a percentage of eddy current losses in total iron losses, measured at 1 T and 400 Hz according to IEC 60404-2 standards, less than 35% when calculated in accordance of Bertotti method.