Hyundai Steel Patente

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Provided is a non-oriented electrical steel sheet including silicon (Si) of 2.0 wt% to 3.8 wt%, aluminum (AI) of 0.1 wt% to 1.3 wt%, manganese (Mn) of 0.1 wt% to 0.5 wt%, carbon (C) of 0 wt% exclusive to 0.003 wt%, sulfur (S) of 0 wt% exclusive to 0.003 wt%, nitrogen (N) of 0 wt% exclusive to 0.003 wt%, titanium (Ti) of 0 wt% exclusive to 0.003 wt%, zirconium (Zr) of 0 wt% exclusive to 0.003 wt%, niobium (Nb) of 0 wt% exclusive to 0.003 wt%, phosphorus (P) of 0.001 wt% to 0.015 wt%, copper (Cu) of 0 wt% exclusive to 0.02 wt%, remainder iron (Fe), and unavoidable impurities.

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

A high-performance steel bar, according to one embodiment of the present invention, includes 0.04 to 0.09 wt% of carbon (C), 0.6 wt% or less (excluding 0) of silicon (Si), 1.45 to 2.5 wt% of manganese (Mn), 0.2 to 2.0 wt% of nickel (Ni), 0.7 wt% or less (excluding 0) of chrome (Cr), 0.001 to 0.07 wt% of niobium (Nb), 0.003 to 0.09 wt% of vanadium (V), 0.02 wt% or less (excluding 0) of phosphorus (P), 0.02 wt% or less (excluding 0) of sulfur (S), 0.5 wt% or less (excluding 0) of copper (Cu), 0.002 to 0.05 wt% of molybdenum (Mo), 0.001 to 0.07 wt% of aluminum (Al), 0.01 wt% or less (excluding 0) of nitrogen (N) and the balance of iron (Fe) and inevitable impurities and satisfies Formula 1 below, in which the yield strength (YS_un) of an unnotched specimen at -170°C is 600 MPa or more. 1668.26 × C(wt%) + 1157.54 × Si(wt%) + 81.40 × Mn(wt%) + 94.51 × Ni(wt%) + 202.33 × Cr(wt%) + 5228.70 × Nb(wt%) + 2256.36 × V(wt%) ≥ 595.01

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

The present disclosure relates to a non-oriented electrical steel sheet and a method for manufacturing the same. According to the non-oriented electrical steel sheet and the method for manufacturing the same of the present disclosure, deformation of the steel sheet during heat treatment can be minimized to suppress an increase in iron loss, and thus excellent magnetic properties can be achieved.

Zusammenfassung wird geladen …

A non-oriented electrical steel sheet according to one embodiment of the present invention includes, in weight%: 2.0 - 3.5% of silicon (S) 0.8 - 1.5% of aluminum (Al); 0.1 - 0.5% of manganese (Mn); 0.005% or less (excluding 0) of carbon (C); 0.005% or less (excluding 0) of nitrogen (N); and the balance of iron (Fe) and other inevitable impurities, and includes a coating layer on the surface, in which the average thickness (T<avg>) of the coating layer is 100 nm or less, and the thickness deviation (T<dev>) of the coating layer is 10 nm or less.

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

A non-oriented electrical steel sheet according to one embodiment of the present invention includes 2.8~3.8 wt% of silicon (Si), 0.2~0.5 wt% of manganese (Mn), 0.5~1.5 wt% of aluminum (Al), 0.005 wt% or less of carbon (C), 0.005 wt% or less of sulfur (S), 0.015 wt% or less of phosphorus (P), 0.005 wt% or less of nitrogen (N), 0.005 wt% or less of titanium (Ti), 0.08 wt% or less of tin (Sn), 0.07 wt% or less of nickel (Ni), 0.07 wt% or less of copper (Cu), and the balance of iron (Fe) and other inevitable impurities, and has a secondary phase volume fraction, which is a particle size of 1.1 µm or more, of 50% or more, and thus can have excellent mechanical properties and magnetic properties.

Zusammenfassung wird geladen …

A method for manufacturing a non-oriented electrical steel sheet, according to one embodiment of the present invention, includes the steps of: (a) preparing steel that is a half-finished product including 2.5-2.8 wt% of silicon (Si), 1.45 wt% or more of nickel (Ni), 0.05 wt% or less of aluminum (Al), and the balance of iron (Fe) and other inevitable impurities; (b) hot rolling the sheet, thereby forming a hot-rolled steel sheet; (c) cold rolling the hot-rolled steel sheet, thereby forming a cold-rolled steel sheet; and (d) cold roll annealing the cold-rolled steel sheet, in which step (d) includes the steps of: (d-1) increasing the temperature from room temperature to a first temperature at which austenite phase is stable, and then maintaining same for a first set time; (d-2) lowering the temperature to a second temperature at which a two-phase region where austenite phase and ferrite phase coexist is stable, and then maintaining same for a second set time; and (d-3) lowering the temperature to room temperature, and the phase transformation heat treatment in the cold roll annealing step can improve the texture such that an orientation favorable to magnetism is developed, and can enhance magnetic properties.

According to one embodiment of the present invention, a non-oriented electrical steel sheet and a method for manufacturing the non-oriented electrical sheet can be provided, the non-oriented electrical steel sheet including 2.8 to 3.8 wt% of silicon (Si), 0.2 to 0.5 wt% of manganese (Mn), 0.5 to 1.5 wt% of aluminum (Al), 0.005 wt% or less of carbon (C), 0.005 wt% or less of sulfur (S), 0.015 wt% or less of phosphorus (P), 0.005 wt% or less of nitrogen (N), 0.005 wt% or less of titanium (Ti), 0.08 wt% or less of tin (Sn), 0.07 wt% or less of nickel (Ni), 0.07 wt% or less of copper (Cu), and the balance of iron (Fe) and other inevitable impurities, satisfying relation 1, and having high strength and high efficiency. 3.0 < log T < 0.4 <img class="EMIRef" id="7ba06c6a-9e4a-49a2-9aff-46ddb1d79887-ia01" /> (T = 5 × [S] + 12 × [Ti] + 6 × [P] + 5 × [Sn] + 15 × [Ni] + 11 × [Cu], in which [S], [Ti], [P], [Sn], [Ni] and [Cu] represent the amounts (ppm) of S, Ti, P, Sn, Ni, and Cu, respectively.)

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …