Provided are coated steel sheets, production methods therefor, and so forth, the coated steel sheets having a tensile strength of 440 MPa or more, good formability, and good aging resistance. A steel sheet of the present invention includes a specific component composition and a steel microstructure having an area fraction of a ferrite phase of 80% or more and 95% or less, an area fraction of pearlite of 5% or more and 20% or less, and an average ferrite grain size of 5 m or more and 20 m or less, in which in a ferrite grain size histogram, the average grain size of the largest 20% of ferrite grains in terms of grain size is 10 m or more, and the pearlite has an average lamellar spacing of 200 nm or less, the area fraction, the average ferrite grain size, and the lamellar spacing being determined by microstructure observation.

A ferritic stainless steel for automotive exhaust system parts with improved expandability is disclosed. A ferritic stainless steel with improved expandability according to an embodiment of the present disclosure includes, in percent (%) by weight of the entire composition, Cr: 10 to 25%, N: 0.015% or less (excluding 0), Al: 0.005 to 0.04%, Nb: 0.1 to 0.6%, Ti: 0.1 to 0.5%, the remainder of iron (Fe) and other inevitable impurities, and satisfies the following equation (1)

equation (1)

(Here, based on the thickness T of ferritic stainless steel, X means [(111)//ND texture fraction]/[(100)//ND texture fraction] of the region from T/3 to 2T/3, and Y means 10*[(100)//ND texture fraction]/[(111)//ND texture fraction] of the region from the surface layer to T/3)

One embodiment of the present invention provides an Fe-based amorphous alloy ribbon for an Fe-based nanocrystalline alloy, the Fe-based amorphous alloy ribbon being a cooled body of a molten metal that has been applied to a surface of a chill roll, wherein the Fe-based amorphous alloy ribbon includes a recess having a depth of 1 m or more in a 0.647 mm0.647 mm region located in a central part, in the ribbon width direction, of a ribbon surface, which is a cooled surface, in which a maximum area of the recess having a depth of 1 m or more is 3000 m.sup.2 or less; and a method of manufacturing the same.

One embodiment of the present invention provides an Fe-based amorphous alloy ribbon for an Fe-based nanocrystalline alloy, the Fe-based amorphous alloy ribbon being a cooled body of a molten metal that has been applied to a surface of a chill roll, wherein the Fe-based amorphous alloy ribbon includes a recess having a depth of 1 m or more in a 0.647 mm0.647 mm region located in a central part, in the ribbon width direction, of a ribbon surface, which is a cooled surface, in which a maximum area of the recess having a depth of 1 m or more is 3000 m.sup.2 or less; and a method of manufacturing the same.

Disclosed is a non-magnetic austenitic stainless steel with improved strength and surface conductivity. An austenitic stainless steel according to an embodiment of the present disclosure includes, in percent (%) by weight of the entire composition, C: 0.07 to 0.2%, N: 0.15 to 0.4%, Si: 0.8 to 2%, Mn: 16 to 22%, S: 0.01% or less (excluding 0), Cr: 12.5 to 20%, Cu: 1 to 3%, the remainder of iron (Fe) and other inevitable impurities, and satisfies the following equation (1).

Ni+0.65Cr+1.05Mn+0.35Si+12.6C+33.6N40(1) Ni, Cr, Mn, Si, C, N are % by weight of each element.

Disclosed is a non-magnetic austenitic stainless steel with improved strength and surface conductivity. An austenitic stainless steel according to an embodiment of the present disclosure includes, in percent (%) by weight of the entire composition, C: 0.07 to 0.2%, N: 0.15 to 0.4%, Si: 0.8 to 2%, Mn: 16 to 22%, S: 0.01% or less (excluding 0), Cr: 12.5 to 20%, Cu: 1 to 3%, the remainder of iron (Fe) and other inevitable impurities, and satisfies the following equation (1).

Ni+0.65Cr+1.05Mn+0.35Si+12.6C+33.6N40(1) Ni, Cr, Mn, Si, C, N are % by weight of each element.

A processing system employs a processing tool to process workpieces, for example cold working holes and/or installing expandable members into holes. Sensors sense various aspects of the processing. Information regarding performance of the process and/or materials may be stored, for example a hole-by-hole or a workpiece-by-workpiece basis, allowing validation of processing. Information also allows dynamic operation of the processing tool. Analysis of response relationships (e.g., pressure or force versus position or distance) may provide insights into the process and materials, and/or facilitate the real-time feedback including control, alerts, ordering replacement for consumable components.

A processing system employs a processing tool to process workpieces, for example cold working holes and/or installing expandable members into holes. Sensors sense various aspects of the processing. Information regarding performance of the process and/or materials may be stored, for example a hole-by-hole or a workpiece-by-workpiece basis, allowing validation of processing. Information also allows dynamic operation of the processing tool. Analysis of response relationships (e.g., pressure or force versus position or distance) may provide insights into the process and materials, and/or facilitate the real-time feedback including control, alerts, ordering replacement for consumable components.

In order to reduce both the weight and the production costs in the case of vehicle chassis components consisting of at least two parts, a first part is made as a sheet component by press hardening and the second part is produced by a conventional production method, which does not include press hardening. The part produced by press hardening forms a structural component, whereas the other component serves to stiffen the part produced by press hardening.

In order to reduce both the weight and the production costs in the case of vehicle chassis components consisting of at least two parts, a first part is made as a sheet component by press hardening and the second part is produced by a conventional production method, which does not include press hardening. The part produced by press hardening forms a structural component, whereas the other component serves to stiffen the part produced by press hardening.