A tailored rolled blank in which a plate thickness changes in a tapered shape in a rolling direction, comprises a thick-wall portion, and a thin-wall portion that is thinner than the thick-wall portion. In the tailored rolled blank, a ratio of an average hardness H.sub.tmax of a thickest wall portion at which the plate thickness is thickest to an average hardness H.sub.tmin of a thinnest wall portion at which the plate thickness is thinnest is in a range of more than 1.0 to 1.5. For the tailored rolled blank, an average dislocation density of the thinnest wall portion is 110.sup.14 m.sup.2 or less, and a number density of fine Ti carbo-nitrides having a particle diameter of 10 nm or less is more than 210.sup.17 per cm.sup.3.

A method of manufacture of an article or component comprising: providing an intermediate article or component comprising, or consisting essentially of, a precipitation strengthened alloy; and treating the intermediate article or component in accordance with a predetermined heat treatment schedule comprising: a solution treatment step (2), wherein the intermediate article is held at a solution temperature for a first predetermined period of time, the solution temperature being above a solvus temperature (7) and below a solidus temperature (6) for the precipitation strengthened alloy; and a first cooling step (3), wherein the intermediate article is cooled at a first cooling rate of up to 20 C. per minute from the solution temperature to an aging temperature, the aging temperature being below the solvus temperature (7) for the precipitation strengthened alloy.

Ferritic stainless steel hot rolled sheet and steel strip excellent in toughness and corrosion resistance which have a predetermined chemical composition, have a Charpy impact value at 0 C. of 10 J/cm.sup.2 or more, and have a thickness of 5.0 to 9.0 mm.

Ferritic stainless steel hot rolled sheet and steel strip excellent in toughness and corrosion resistance which have a predetermined chemical composition, have a Charpy impact value at 0 C. of 10 J/cm.sup.2 or more, and have a thickness of 5.0 to 9.0 mm.

A steel alloy with unique and superior combinations of properties such as elevated temperature strength, oxidation resistance, thermal conductivity and wear resistance. Disclosed embodiments comprise or substantially consist of: C in an amount of 0.2-0.45 weight %; Si in an amount of 0.6-1.1 weight %; Mn in an amount of ?1.1 weight %; Cr in an amount of 2.5-4.0 weight %; one or both of Mo or W, a combined amount of the Mo or W?0.9 weight %; Ti in an amount of 0.035-0.14 weight %; V in an amount of 0.18-1.1 weight % and the balance being Fe and usual impurities.

The present invention relates to a ferritic free-cutting stainless steel material having a component composition contains: in terms of mass %, 10.0%?Cr?25.0%, 0.2%?Mn?2.0%, 0.30%?Al?2.50%, 0.02%?Si?0.60%, and 0.10%?S?0.45%, and further two or more selected from the group consisting of: 0.03%?Pb?0.40%, 0.03%?Bi?0.40%, and 0.01%?Te?0.10%, with a balance being Fe and unavoidable impurities. The component composition satisfies: 900([C]+[N])+170[Si]+12[Cr]+30[Mo]+10[Al]?300, and ([Cr]+[Mo]+1.5[Si]+4[Al])/([Ni]+0.5[Mn]+30[C]+30[N])?7. The ferritic free-cutting stainless steel material contains sulfides having a circle equivalent diameter of 1.5 ?m or more, and the sulfides have an average circle equivalent diameter of 3.0 to 15.0 ?m, an average aspect ratio of 2.5 or less, and an area ratio of 0.5 to 2.0%, and the maximum value of Vickers hardness of 170 HV or less.

A cylindrical part of a rotor for an eddy current deceleration device of the present embodiment has a chemical composition consisting of, by mass %, C: 0.05 to 0.15%, Si: 0.10 to 0.40%, Mn: 0.50 to 1.00%, P: 0.030% or less, S: 0.030% or less, Mo: 0.20 to 1.00%, Nb: 0.020 to 0.060%, V: 0.040 to 0.080%, sol. Al: 0.030 to 0.100%, B: 0.0005 to 0.0050%, N: 0.003 to 0.010%, Cu: 0 to 0.20%, Ni: 0 to 0.20%, Cr: 0 to 0.10%, and the balance: Fe and impurities, and in which the total area fraction of martensite and bainite in a microstructure is more than 95.0%, and the number density of carbides having an equivalent circular diameter of 100 to 500 nm is 0.35 to 0.75 particles/?m.sup.2.

A rolled steel sheet, for press hardening is provided, having a chemical composition where Ti/N>3.42, and the carbon, manganese, chromium and silicon contents satisfy: $2.6C+\frac{\mathrm{Mn}}{5.3}+\frac{\mathrm{Cr}}{13}+\frac{\mathrm{Si}}{15}?1.1\%.$
The sheet has a nickel content Ni.sub.surf at any point of the steel in the vicinity of the surface over a depth ?, such that: Ni.sub.surf>Ni.sub.nom, Ni.sub.nom denoting the nominal nickel content of the steel, and such that, Ni.sub.max denoting the maximum nickel content within ?: $\frac{\left({\mathrm{Ni}}_{\max }+{\mathrm{Ni}}_{\mathrm{nom}}\right)}{2}?\left(?\right)?0.6,$
and such that: $\frac{\left({\mathrm{Ni}}_{\max }-{\mathrm{Ni}}_{\mathrm{nom}}\right)}{?}?0.01$
and the surface density of all of the particles D.sub.i, and the surface density of the particles D.sub.(>2 ?m) larger than 2 micrometers satisfy, at least to a depth of 100 micrometers in the vicinity of the surface of said sheet:
D.sub.i+6.75D.sub.(>2 ?m)<270
D.sub.i and D.sub.(>2 ?m) being expressed as number of particles per square millimeter, and said particles denoting all the oxides, sulfides, and nitrides, either pure or combined such as oxysulfides and carbonitrides, present in the steel matrix.

The present invention relates to a maraging steel containing, in terms of mass %, 0.10C0.35, 9.0Co20.0, 1.0(Mo+W/2)2.0, 1.0Cr4.0, a certain amount of Ni, a certain amount of Al, and V+Nb0.60, with the balance being Fe and inevitable impurities, in which in a case of V+Nb0.020, the amount of Ni is 6.0Ni9.4 and the amount of Al is 1.4Al2.0, and in a case of 0.020<V+Nb0.60, the amount of Ni is 6.0Ni20.0 and the amount of Al is 0.50Al2.0.

The present invention relates to a maraging steel containing, in terms of mass %, 0.10C0.35, 9.0Co20.0, 1.0(Mo+W/2)2.0, 1.0Cr4.0, a certain amount of Ni, a certain amount of Al, and V+Nb0.60, with the balance being Fe and inevitable impurities, in which in a case of V+Nb0.020, the amount of Ni is 6.0Ni9.4 and the amount of Al is 1.4Al2.0, and in a case of 0.020<V+Nb0.60, the amount of Ni is 6.0Ni20.0 and the amount of Al is 0.50Al2.0.