Nippon Steel Patente

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

A high-Ni alloy having excellent high-temperature creep strength, includes, in mass%: C: 0.08% or less; Cr: 20 to 30%; Ni: 23 to 60%; Al: 0.01 to 0.20%; Ti: 0.05% or less; B: 0.0002 to 0.0050%; N: 0.10 to 0.30%; O: 0.006% or less; Ca: 0.0001 to 0.0050%; at least one of Mo or W in an amount such that Mo + 0.5 × W is 0.01% or more and less than 1.50%; Nb: 0.10 to 0.65%; at least one of V or Ta in a total amount of 0.01 to 0.60%, and the alloy satisfying Inequalities A and B below,Inequality A: 0.65≤Nb%+2×V%+Ta%≤1.50Inequality B: Nb%+0.15×V%+0.4×Ta%×C%+N%≤0.170.

The present invention relates to a plated steel sheet having a high LME resistance. The plated steel sheet of the present invention has a tensile strength of 780 MPa or more and a predetermined chemical composition. The plating layer contains Zn. A depth in a thickness direction of the steel sheet from an interface of the steel sheet and the plating layer wherein a C concentration measured by GDS is 0.05% or less is 8 µm or more, a thickness in a thickness direction of the steel sheet from an interface of the steel sheet and the plating layer of the layer with an area ratio of the ferrite phase of 90% or more is 8 µm or more, and at a position of 4 µm in a thickness direction of the steel sheet from an interface of the steel sheet and the plating layer, the solute amounts of the metal Si and metal Al in the ferrite phase are a total of 0.3% or more.

The present invention relates to steel sheet and plated steel sheet having a high LME resistance. The steel sheet of the present invention has a tensile strength of 780 MPa or more and a predetermined chemical composition. A depth in a thickness direction of the steel sheet from a surface of the steel sheet wherein a C concentration measured by GDS of 0.05% or less is 8 µm or more, a thickness in a thickness direction of the steel sheet from a surface of the steel sheet of the layer with an area ratio of the ferrite phase of 90% or more is 8 µm or more, and at a position of 4 µm in a thickness direction of the steel sheet from the surface of the steel sheet, the solute amounts of the metal Si and metal Al in the ferrite phase are a total of 0.3% or more.

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

The method for zero-adjusting a deviation angle of a hydraulic pair cross mill according to this invention is a method for zero-adjusting a deviation angle of a hydraulic pair cross mill for adjusting a zero point of a deviation angle θ₂ between work rolls 11W, 12W and backup rolls 11B, 12B in an upper pair 11P and/or a lower pair 12P, wherein the method includes acquiring a correlation between a cross angle θ₁ and a measured value of a thrust force F acting on the work rolls 11W, 12W and/or the backup rolls 11B, 12B for each deviation angle θ₂ while changing the deviation angle θ₂ in a state where a pressing pressure of a pressing cylinder 132 is set to a pressure for zero adjustment lower than a pressure during steady operation, and setting a value of the deviation angle θ₂ at which the correlation showing the thrust force of zero when the cross angle θ₁ is a zero degree is acquired, to a zero point.

The present invention has as its technical problem to suppress cracks and other failure at the time of press-forming an integrated blank formed by partially overlapping a plurality of partial blanks and has as its object the provision of such a blank (integrated blank). The present invention provides a method for manufacturing a blank for press-forming comprised of a plurality of partial blanks made of steel sheets joined into one piece, the blank for press-forming having an overlap section configured by at least two partial blanks partially overlaid, the method finding the material inflow amounts of the partial blanks (movement vectors of points on partial blanks) due to press-forming in advance at the overlap section and joining the partial blanks forming the overlap section at only a section with an absolute value of difference of inflows (movement vectors) smaller than a predetermined limit value so as to produce a blank for press-forming, hot press-forming the blank, then joining the other parts of the overlap section to obtain a desired press-formed part.

In this hot-dip plated steel material, the plated layer has a chemical composition including, in terms of mass%, more than 10.0% and 60.0% or less of Al, 4.0% or more and 15.0% or less of Mg, 3.5% or more and 8.0% or less of Si, and a remainder of Zn and impurities, and in a case where, in an elemental distribution profile obtained by a qualitative analysis using a GDS method in a direction from a surface of the plated layer toward the steel material, a thickness of a region from a surface of the plated layer to a depth position where an Fe intensity corresponding to 5% with respect to the maximum intensity of Fe is detected is denoted by Tg, the average value of Si from the surface of the plated layer to Tg/3 is denoted by Si (surf), the average value of Si in a range of Tg/3 to 2 Tg/3 starting from the surface of the plated layer is denoted by Si (centre), and the average value of Si in a range of 2 Tg/3 to Tg starting from the surface of the plated layer is denoted by Si (deep), Expression (1) is satisfied. Si surf < Si deep < Si centre <img class="EMIRef" id="914a8b3b-e6de-4413-a854-b6ce83484776-ia01" />

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 …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …