摘要:
The present invention provides a non-oriented electrical steel sheet having crystal grains of small diameter and excellent workability before stress relief annealing and having crystal grains of largely grown diameter and excellent iron loss property after stress relief annealing and a method for producing the same, and relates to a low iron loss non-oriented electrical steel sheet excellent in workability, containing, in weight %, 0.010% or less of C, 0.1 to 1.5% of Mn, 0.1 to 4% of Si, 0.1 to 4% of Al, wherein the latter three elements satisfy the formula Si+Mn+Al≦5.0%, and 0.0005 to 0.0200% of Mg, or further containing 0.005% or more of Ca, wherein the total amount of Mg and Ca is 0.0200% or less, or further containing 0.005% or more of REM, wherein the total amount of Mg and REM is 0.0200% or less, or further containing 0.005% or more of Ca and REM, wherein the total amount of Mg, Ca and REM is 0.0200% or less, and containing the remainder consisting of Fe and unavoidable impurities.
摘要:
Disclosed is a steel sheet in which the amounts of respective elements in chemical components, which are represented by mass %, satisfy the following Expression 1 and Expression 2. In addition, the steel contains Ti-included-carbonitrides as inclusions, and the number density of the Ti-included-carbonitrides having a long side of 5 μm or more is 3 pieces/mm2 or less. 0.3≦{Ca/40.88+(REM/140)/2}/(S/32.07) (Expression 1) Ca≦0.005−0.0035×C (Expression 2)
摘要:
A cast steel with excellent workability, characterized in that not less than 60% of the total cross section thereof is occupied by equiaxed crystals, the diameters (mm) of which satisfy the following formula: D
摘要:
Disclosed is a steel sheet in which the amounts of respective elements in chemical components, which are represented by mass %, satisfy the following Expression 1 and Expression 2. In addition, the steel contains Ti-included-carbonitrides as inclusions, and the number density of the Ti-included-carbonitrides having a long side of 5 μm or more is 3 pieces/mm2 or less. 0.3≦{Ca/40.88+(REM/140)/2}/(S/32.07) (Expression 1) Ca≦0.005−0.0035×C (Expression 2).
摘要:
A cast steel with excellent workability, characterized in that not less than 60% of the total cross section thereof is occupied by equiaxed crystals, the diameters (mm) of which satisfy the following formula: D
摘要:
The present invention provides a ferritic stainless steel casting and a sheet thereof excellent in deep drawability, punch stretchability and ridging resistance and a method for producing the casting and the sheet. In the present invention, a chemical composition is controlled so that the amounts of C, N, Si, Mn, P and Ti may be reduced to the utmost for securing high workability and, on the basis of the chemical composition, the roping and ridging of a steel sheet product is reduced by adding Mg, thus dispersing Mg containing oxides that accelerate the formation of nuclei for solidification and, resultantly, suppressing the development of coarse columnar crystals in a casting. The present invention is characterized in that the average composition of the Mg containing oxides dispersing in a casting satisfies the following expressions and , 17.4(Al2O3)+3.9(MgO)+0.3(MgAl2O4)+18.7(CaO)≦500 , (Al2O3)+(MgO)+(MgAl2O4)+(CaO)≧95 .
摘要翻译:本发明提供一种铁素体不锈钢铸件及其深冲性,冲压伸缩性和抗皱性优异的片材以及铸造和片材的制造方法。 在本发明中,化学成分被控制为使得可以将C,N,Si,Mn,P和Ti的量最大限度地降低以确保高的可加工性,并且基于化学成分,卷绕和起皱 通过添加Mg来还原钢板产品,从而分散加速形成核固化的含Mg氧化物,从而抑制铸造中的粗大柱状晶体的发展。 本发明的特征在于,分散在铸件中的含Mg氧化物的平均组成满足以下表达式2和3,17.4(Al 2 O 3)+3.9(MgO)+0.3(MgAl 2 O 4)+18.7(CaO) (Al 2 O 3)+(MgO)+(MgAl 2 O 4)+(CaO)> = 95 3。
摘要:
This pearlitic rail consists of a steel including: in terms of percent by mass, C: 0.65% to 1.20%; Si: 0.05% to 2.00%; Mn: 0.05% to 2.00%; and REM: 0.0005% to 0.0500%, with the balance being Fe and inevitable impurities, wherein, in a head portion of the rail, a head surface portion which ranges from surfaces of head corner portions and a head top portion to a depth of 10 mm has a pearlite structure, and the hardness Hv of the head surface portion is in a range of 320 to 500.
摘要:
This pearlitic rail consists of a steel including: in terms of percent by mass, C: 0.65% to 1.20%; Si: 0.05% to 2.00%; Mn: 0.05% to 2.00%; and REM: 0.0005% to 0.0500%, with the balance being Fe and inevitable impurities, wherein, in a head portion of the rail, a head surface portion which ranges from surfaces of head corner portions and a head top portion to a depth of 10 mm has a pearlite structure, and the hardness Hv of the head surface portion is in a range of 320 to 500.
摘要:
The present invention is: a pearlitic steel rail excellent in wear resistance and ductility, characterized in that, in a steel rail having pearlite structure containing, in mass, 0.65 to 1.40% C, the number of the pearlite blocks having grain sizes in the range from 1 to 15 μm is 200 or more per 0.2 mm2 of an observation field at least in a part of the region down to a depth of 10 mm from the surface of the corners and top of the head portion; and a method for producing a pearlitic steel rail excellent in wear resistance and ductility, characterized by, in the hot rolling of said steel rail, applying finish rolling so that the temperature of the rail surface may be in the range from 850° C. to 1,000° C. and the sectional area reduction ratio at the final pass may be 6% or more, and then applying accelerated cooling to the head portion of said rail at a cooling rate in the range from 1 to 30° C./sec. from the austenite temperature range to at least 550° C.
摘要:
The present invention provides a ferritic stainless steel casting and a sheet thereof excellent in deep drawability, punch stretchability and ridging resistance and a method for producing the casting and the sheet. In the present invention, a chemical composition is controlled so that the amounts of C, N, Si, Mn, P and Ti may be reduced to the utmost for securing high workability and, on the basis of the chemical composition, the roping and ridging of a steel sheet product is reduced by adding Mg, thus dispersing Mg containing oxides that accelerate the formation of nuclei for solidification and, resultantly, suppressing the development of coarse columnar crystals in a casting. The present invention is characterized in that the average composition of the Mg containing oxides dispersing in a casting satisfies the following expressions and , 17.4(Al2O3)+3.9(MgO)+0.3(MgAl2O4)+18.7(CaO)≦500 , (Al2O3)+(MgO)+(MgAl2O4)+(CaO)≧95 .
摘要翻译:本发明提供一种铁素体不锈钢铸件及其深冲性,冲压伸缩性和抗皱性优异的片材以及铸造和片材的制造方法。 在本发明中,化学成分被控制为使得可以将C,N,Si,Mn,P和Ti的量最大限度地降低以确保高的可加工性,并且基于化学成分,卷绕和起皱 通过添加Mg来还原钢板产品,从而分散加速形成核固化的含Mg氧化物,从而抑制铸造中的粗大柱状晶体的发展。 本发明的特征在于,分散在铸件中的含Mg氧化物的平均组成满足以下表达式2和3,17.4(Al 2 O 3)+3.9(MgO)+0.3(MgAl 2 O 4)+18.7(CaO) &Al; 500 2,(Al 2 O 3)+(MgO)+(MgAl 2 O 4)+(CaO)≥953。