Identify the trade name of the cobalt–chromium–tungsten non-ferrous cast alloy widely used for wear-resistant cutting edges and hot-hard applications.

Introduction / Context:
Tool and wear-resistant materials are chosen for hot hardness, chemical stability, and toughness. Cobalt–chromium–tungsten cast alloys became famous under a specific trade name for high-temperature and abrasion resistance in valves, dies, and some cutting applications.

Given Data / Assumptions:

• Non-ferrous, cast alloy system containing Co–Cr–W.
• Application focus: wear resistance and hot hardness.
• Recognition of common tooling trade names.

Concept / Approach:
Stellite is a family of cobalt-base alloys with chromium and tungsten (often carbon as well), known for excellent hardness at elevated temperature and corrosion resistance. It is not the same as cemented carbides (WC-Co) nor ceramics/cermets, and “diamond” is a superabrasive, not a metallic cast alloy.

Step-by-Step Solution:

Verification / Alternative check:
Materials handbooks list Stellite grades (e.g., Stellite 6) with characteristic properties and cast/weld overlay applications.

Why Other Options Are Wrong:

• Ceramic/diamond: not metallic cast alloys of Co–Cr–W.
• Cemented carbide: composite of tungsten carbide grains in cobalt, not a Co–Cr–W cast alloy.
• Cermet: ceramic–metal composite, different class.

Common Pitfalls:
Confusing Stellite with tungsten carbide because both involve cobalt; their chemistry, microstructure, and processing differ significantly.

Final Answer:
stellite