The copper-comprising target has a yield strength of greater than or equal to about 15 ksi and a Brinell hardness (HB) of greater than about 40.

The rotor lamination assembly further includes at least one lamination element formed from a second material having a second yield strength that is higher than the first yield strength, and at least one lamination component.

The inner tube includes a polymeric material and the outer tube includes a material having a greater yield strength than the polymeric material.

The steel plate has yield strength of more than 800MPa, tensile strength of more than 900MPa, charpy impact value (-20°C) Akv of ≥150J and has good weldability.

The steel sheet has a recovery annealed microstructure, a yield strength greater than 820 megapascals (MPa) and a percent elongation to failure greater than 3.5%.

Cooling process of the formed workpiece between dies under pressure provides dimensional accuracy and increased yield strength resulted by regular elongation effect and rapid temperature decrease .

A packer ring of high tensile steel is situated within the pressure sleeve in direction against the packer (1), preferably having a yield strength above 700 MPa.

The second polymeric material has a higher yield strain and/or a lower hardness than at least the first polymeric material, and preferably both the first and the third polymeric materials.

The duplex stainless steel of the present invention has reduction in area of more than 50% at 1050°C, and has yield strength of more than 400 MPa, and corrosion rate of less than 0.36 mm/year, after solution heating.

　Provided are a hot-rolled steel sheet having a yield strength of 740 MPa or higher and excellent strength stability within the plate face, and a process for production thereof.