Introduction

Selecting the wrong carbide rod grade will shorten tool life or cause chipping and breakage. The substrate composition directly defines hardness, wear resistance and impact toughness. Rleey produces solid carbide round rods in multiple grades, tailored for end mill blanks, drill blanks and static wear components. This guide helps you understand substrate properties and match grades to your target application.

Carbide Substrate & Cobalt Binder Basics

Tungsten carbide substrates are WC grains bonded with cobalt. Higher cobalt binder percentage improves toughness and shock resistance; lower cobalt increases hardness and abrasive wear resistance. Grain size is another key factor: fine grain grades deliver higher hardness for precision cutting, coarse grain grades offer better impact resistance under heavy loads.

Hardness vs Toughness Trade-off

There is an inherent balance between hardness and toughness. A very hard low-cobalt grade will resist abrasive wear well but is sensitive to impact and chipping. High cobalt grades survive heavy vibration and shock but wear faster under continuous abrasive friction. Your machining material and cutting conditions decide which property should be prioritized.

Carbide Rod Grade Reference Table

Grade Matching for Drills, End Mills & Wear Parts

• End mills for steel: YG8 or fine grain YG8 substrate, suitable for continuous and semi-interrupted milling
• Micro drills: Fine grain low cobalt grades for high hardness and edge retention
• Wear pins / static wear components: YG6 for pure abrasive wear with no heavy shock
• Tools for interrupted cutting: YG10, better resistance to chipping under vibration

Substrate Selection Tips for Coated Tools

If your finished drills or end mills will receive TiN, TiAlN or other PVD coatings, substrate toughness matters. The substrate must withstand coating temperature and post-coat grinding. Brittle low-cobalt substrates are not recommended for tools facing heavy shock after coating.

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