Benteler Steel/tube Gmbh

Martin Junker

Jozef Balun

Thomas Fortmeier

Thomas Vietoris

Christian Kronholz

Sandor Schumann

Albert Lorentz

The present invention relates to a, comprising a tubular element () with at least one heat-affected zone (), characterized by a yield strength Rpin the heat-affected zone () of at least 640 MPa and a tensile strength Rm in the heat-affected zone of at least 850 MPa and by at least the tubular element () consisting of a steel alloy consisting, in weight percent: balance iron and impurities resulting from smelting.

Chassis or drive component

In a method for the production of a seamless, multilayered tubular product, a further layer is applied through hardfacing on a base layer of a round or polygonal block, with the further layer made of a metallic material which is different than a metallic material of the base layer. The round or polygonal block with hardfaced further layer is hot formed to produce a tubular product with reduced wall thickness and outer perimeter in one or more stages. A diffusion layer is established between the base layer and the further layer through heat treatment before hot forming and/or after hot forming, thereby producing a thickness of the diffusion layer of at least 5 &#x3bc;m with the proviso that the thickness of the diffusion layer is 0.1% to 50% of a thickness of the further layer, with the thickness of the further layer being equal to or greater than 100 &#x3bc;m.

Method for the production of a seamless, multilayered tubular product, and round or polygonal block for use in this method

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Verl, Germany

Martin Junker