Drill bit insert for rock drilling

US10858891B2 · kind B2 · utility

Assignee

• EPIROC DRILLING TOOLS AKTIEBOLAG · SE

Inventors

• Tomas Rostvall · Stockholm, SE
• Niklas Ahlen · Söderbärke, SE

Key dates

• Filing date: Nov 17, 2017
• Grant date: Dec 8, 2020
• Expiry date: Nov 17, 2037

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B22F2005/001
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Drill bit insert with a sintered cemented carbide body including a hard phase of tungsten carbide (WC) and a binder phase wherein the cemented carbide comprises 5.0-7.0 wt % Co, 0.10-0.35 wt % Cr, and a Cr/Co weight ratio of 0.015-0.058. The cemented carbide body has a hardness of 1520-1660 Hv30 and a toughness of K1c≥10.0 both measured in the bulk at the center of the longitudinal axis through the center of the insert, or ≥5 mm from any surface of the insert. The insert further has a surface toughness K1c≥12.0 measured at 0.5 mm below the surface of the body in a transverse direction to the longitudinal axis the insert. The invention also relates to a drill bit comprising the insert and the use of such a drill bit for drilling.