Instytut Wysokich Cisnien Polskiej Akademii Nauk

Konrad Wojciechowski

Waclaw Pachla

Mariusz Kulczyk

Jacek Skiba

Rods with the transverse cross-section surface area of at least 150 mmand tensile strength UTS above 1200 Mpa is produced using a plastic deformation that consisted of one-pass hydrostatic extrusion of the billetmade of austenitic steel, with the initial temperature of the billet being below 100&#xb0; C. The reduction R of the transverse cross-section surface area of the biller (), which takes place during the extrusion, is at least 2.

Method of producing high-strength rods of austenitic steel and a rod produced by such method

The method consists of subjecting a coarse-grained titanium semi-product () with the pure titanium content of at least 99 wt % to a plastic deformation. In said plastic deformation the transverse cross-section surface area of the titanium semi-product is reduced by hydrostatic extrusion in which the titanium semi-product is the billet () extruded through the die (). The reduction (R) of the transverse cross-section of the titanium billet () is realized in at least three but not more than five consecutive hydrostatic extrusion passes at the initial temperature of the billet () not above 50&#xb0; C. and the extrusion velocity not above 50 cm/s. Prior to each hydrostatic extrusion pass, the titanium billet is covered with a friction-reducing agent. During the first hydrostatic extrusion pass, the reduction of the transverse cross-section surface area of the titanium semi-product is at least four, whereas during the second and third hydrostatic extrusion pass it is at least two and a half.

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Celestynów, Poland

Konrad Wojciechowski