Abstract: A steel plate excellent in acid dew point corrosion resistance has a composition, in mass percent, from 0.001 to 0.15% of C, 0.80% or less of Si, 1.50% or less of Mn, 0.025% or less of P, 0.030% or less of S, from 0.10 to 1.00% of Cu, 0.50% or less of Ni, from 0.05 to 0.25% of Cr, 0.01 to 0.08% of Mo, 0.100% or less of Al, from 0 to 0.20% in total of Ti, Nb, and V, from 0 to 0.010% of B, from 0 to 0.10% in total of Sb and Sn, and a balance of Fe and unavoidable impurities, having a ferrite single phase structure, or a structure containing 30% by volume or less in total of one or more of cementite, pearlite, bainite, and martensite, with the balance ferrite phase. Ferrite crystal grains have an average crystal grain diameter of 12.0 mm or less.

Abstract: The present invention manufactures a steel sheet for a rotor core for an IPM motor, wherein the steel sheet has a magnetic flux density B8000 of 1.65 T or more as measured when magnetic field strength is 8000 A/m, and a residual magnetic flux density Br of 0.5 T or more as measured at that time, and optionally, a coercivity Hc of 100 A/m or more as measured after magnetization reaches 8000 A/m. By using the steel sheet manufactured according to the present invention for a rotor core of an IPM motor, it is possible to increase further an output torque in a high-speed rotational range and raise further the maximum rotational speed.

Abstract: A steel plate excellent in acid dew point corrosion resistance has a composition, in mass percent, from 0.001 to 0.15% of C, 0.80% or less of Si, 1.50% or less of Mn, 0.025% or less of P, 0.030% or less of S, from 0.10 to 1.00% of Cu, 0.50% or less of Ni, from 0.05 to 0.25% of Cr, 0.01 to 0.08% of Mo, 0.100% or less of Al, from 0 to 0.20% in total of Ti, Nb, and V, from 0 to 0.010% of B, from 0 to 0.10% in total of Sb and Sn, and a balance of Fe and unavoidable impurities, having a ferrite single phase structure, or a structure containing 30% by volume or less in total of one or more of cementite, pearlite, bainite, and martensite, with the balance ferrite phase. Ferrite crystal grains have an average crystal grain diameter of 12.0 mm or less.

Abstract: The present invention provides a steel sheet for a rotor core for an IPM motor, wherein the steel sheet has a magnetic flux density B8000 of 1.65 T or more as measured when magnetic field strength is 8000 A/m, and a residual magnetic flux density Br of 0.5 T or more as measured at that time, and optionally, a coercivity Hc of 100 A/m or more as measured after magnetization reaches 8000 A/m. By using the steel sheet of the present invention for a rotor core of an IPM motor, it is possible to increase further an output torque in a high-speed rotational range and raise further the maximum rotational speed.

Abstract: The present invention manufactures a steel sheet for a rotor core for an IPM motor, wherein the steel sheet has a magnetic flux density B8000 of 1.65 T or more as measured when magnetic field strength is 8000 A/m, and a residual magnetic flux density Br of 0.5 T or more as measured at that time, and optionally, a coercivity Hc of 100 A/m or more as measured after magnetization reaches 8000 A/m. By using the steel sheet manufactured according to the present invention for a rotor core of an IPM motor, it is possible to increase further an output torque in a high-speed rotational range and raise further the maximum rotational speed.

Abstract: The present invention provides a steel sheet for a rotor core for an IPM motor, wherein the steel sheet has a magnetic flux density B8000 of 1.65 T or more as measured when magnetic field strength is 8000 A/m, and a residual magnetic flux density Br of 0.5 T or more as measured at that time, and optionally, a coercivity Hc of 100 A/m or more as measured after magnetization reaches 8000 A/m. By using the steel sheet of the present, invention for a rotor core of an IPM motor, it is possible to increase further an output torque in a high-speed rotational range and raise further the maximum, rotational speed.

Abstract: A steel sheet has composition consisting of 0.003-0.10 wt. % C, not more than 1.0 wt. % Si, 0.05-1.5 wt. % Mn, not more than 0.10 wt. % P, not more than 0.02 wt. % S, 1.5-8.0 wt. % Cr, 0.003-0.10 wt. % Al, at least one of 0.08-0.40 wt. % Ti, 0.08-0.40 wt. % Nb and 0.08-0.40 wt. % V, optionally at least one of Cu up to 2.0 wt. %, Ni up to 2.0 wt. %, 0.01-2.0 wt. % Mo, 0.01-2.0 wt. % W and 0.0003-0.0050 wt. % B and the balance being essentially Fe except inevitable impurities. The steel sheet is good of both a room-temperature strength and a high temperature strength. The new steel sheet is useful as a frame member of a color picture tube for stretching color selecting electrode elements, instead of an expensive ferritic stainless steel.

Abstract: A steel sheet has composition consisting of 0.003-0.10 wt. % C, not more than 1.0 wt. % Si, 0.05-1.5 wt. % Mn, not more than 0.10 wt. % P, not more than 0.02 wt. % S, 1.5-8.0 wt. % Cr, 0.003-0.10 wt. % Al, at least one of 0.08-0.40 wt. % Ti, 0.08-0.40 wt. % Nb and 0.08-0.40 wt. % V, optionally at least one of Cu up to 2.0 wt. %, Ni up to 2.0 wt. %, 0.01-2.0 wt. % Mo, 0.01-2.0 wt. % W and 0.0003-0.0050 wt. % B and the balance being essentially Fe except inevitable impurities. The steel sheet is good of both a room-temperature strength and a high temperature strength. The new steel sheet is useful as a frame member of a color picture tube for stretching color selecting electrode elements, instead of an expensive ferritic stainless steel.