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

US10208361B2 · kind B2 · utility

Assignee

• Benteler Steel/Tube GmbH · DE

Inventors

• Martin Junker · Rheinberg, DE
• Thomas Vietoris · Berlin, DE
• Christian KRONHOLZ · Ulmen, DE
• Albert Lorentz · Kerken, DE

Key dates

• Filing date: Jul 8, 2016
• Grant date: Feb 19, 2019
• Expiry date: Aug 8, 2037

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D2251/02
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

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 μm 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 μm.