Coated turning insert and method of making it

USRE39999E1 · kind E1 · reissue

Assignee

• Sandvik Intellectual Property AB · SE

Inventors

• Per Lindskog · Alvesta, SE
• Per Gustafson · Huddinge, SE
• Bjorn Ljungberg · Stuvsta-Snättringe, SE
• Ake Ostlund · Stuvsta-Snättringe, SE

Key dates

• Filing date: Nov 29, 1996
• Grant date: Jan 8, 2008
• Expiry date: Nov 29, 2016

Classification

• Technology area (CPC —): General

Abstract

A coated turning insert particularly useful for turning in stainless steel is disclosed. The insert is characterized by a WC—Co-based cemented carbide substrate having a highly W-alloyed Co-binder phase and a coating including an inner layer of TiCxNyOz with columnar grains followed by a layer of fine-grained, κ-Al2O3 and a top layer of TiN. The layers are deposited by using CVD methods.