Abstract: A compound steel workpiece and a process for its production, wherein a support jacket is provided with at least one recess, which in turn is furnished with a lining resistant to attrition and corrosion, which lining is connected to the support jacket by a metal bond. In the process, which has particular application in the production of double or multiple screw cylinders for use in plastics processing, the support jacket is provided with at least one core at the point(s) at which the recess(es) are desired, is subjected to hot-forming, along with the core(s), at an appropriate temperature, in particular for cross-sectional reduction a cross-sectional shape deviating from that of a circle is imparted to the core(s) and the recess(es) are created in the core(s).

Abstract: A method and apparatus for performing forming operations on steels, metals, and alloys having low deformability and/or high resistance to deformation at room temperature, wherein the thickness of the stock material is small. In the method, stock material is heated by continuous rapid heating, to a temperature of at least 400.degree. C. and at most the AC-1 temperature of the alloy, and the heated material is subjected to a two-stage or multistage forming operation wherein the overall reduction in cross section is substantial. The apparatus includes a heating device of the electrical induction or direct contact type, followed by a temperature equalization and guide device and a multi-stand roll forming mill which may have cooling devices between each stand.

Abstract: Process for the powder-metallurgical production of work pieces, particularly tools, containing high-melting point carbides and/or carbonitrides homogeneously distributed in a matrix, in which an amount of elements of the IVa and Va groups, or secondary groups, of the periodic table is adjusted to at least 3 weight percent of the alloy, a low carbon and/or nitrogen concentration is established, and primary precipitates are prevented; and a desired carbon and/or nitrogen content is created by atomization of the melt into powder vaporizing medium.

Abstract: A process for rolling wire or rod material, such as hardenable steel, high speed steel and copper phosphorous alloys, includes feeding the material continuously from a supply roll through a heating zone and a rolling device for rolling the material in at least two stages, wherein the material at room temperature has a low deformation capacity unsuitable for rolling in the rolling device and therefore is heated in the heating zone to a temperature of improved deformation capacity suitable for rolling, the temperature of the material is continuously measured between the heating zone and the rolling device, a determination is made as to whether the material has been heated to a predetermined deformation temperature appropriate for rolling, diverting any portion of the material determined to have a temperature other than the appropriate rolling temperature away from the rolling device to prevent the diverted portion from entering the rolling device and being rolled, severing the diverted portion between the heati

Abstract: Martensite-hardenable steel, particularly for the production of molds for plastic materials, which consists in weight % of______________________________________ carbon 0.06-0.2 silicon 0.15-0.8 manganese 1.4-3.6 sulfur 0.12-0.4 chromium 0-0.9 nickel 2.8-4.3 vanadium 0.03-0.15 copper 0.1-4.0 aluminum 0.1-4.0 aluminum + copper 0.9-4.1 niobium 0.03-0.12 zirconium 0.01-0.1 calcium 0-0.01 titanium 0.01-0.1 molybdenum 0-1.0 tungsten 0-1.0 Mo + W/2 0-1.5 residue: iron and production impurities.