Tungsten Carbide Grades (ISO K, M, P): Chart, WC Content & Applications Guide

Tungsten carbide grades are essential for determining machining performance, wear resistance, and tool life across different industrial applications. Understanding the ISO classification system—including K, M, and P series grades such as K10, M20, and P30—helps engineers and buyers select the most suitable material for cast iron, stainless steel, and steel machining.

This page provides a comprehensive tungsten carbide grades chart, covering ISO K-series, M-series, and P-series grade equivalents across major manufacturers, along with WC content comparison and application guidance. Whether you are looking for finishing, general machining, or heavy-duty cutting solutions, this guide serves as a practical reference for carbide grade selection.

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Tungsten Carbide Grades K10, K15, K20, K30: ISO K-Series Grade Chart (2026)

This tungsten carbide grade chart provides a cross-reference of ISO K-series grades, including K10, K15, K20, and K30, across major global manufacturers. These carbide grades are primarily designed for machining cast iron, ductile iron, and non-ferrous materials, with each grade optimized for different cutting speeds, wear resistance, and toughness requirements.

K10 grades are typically used for high-speed finishing of gray cast iron, offering excellent wear resistance. K15 and K20 grades provide a balanced combination of hardness and toughness for general machining of ductile iron and similar materials. K30 grades are designed for heavy cutting conditions, lower speeds, and applications involving higher mechanical loads such as compacted graphite iron.

Please note that equivalent grades may vary depending on coating type, substrate composition, and machining conditions. This chart is intended as a general reference for grade comparison and initial material selection.

Tungsten Carbide Grades M10, M20, M25, M30, M35: ISO M-Series Grade Chart

This 2026 ISO M-series tungsten carbide grade chart compares common M10, M20, M25, M30, and M35 carbide grades across major global manufacturers. ISO M-series carbide grades are mainly used for stainless steel, cast steel, alloy steel, and difficult-to-machine materials where balanced wear resistance, toughness, and cutting stability are required.

M10 grades are typically used for continuous high-speed cutting and surface finishing. M20 and M25 grades are suitable for general machining and light interrupted cutting. M30 and M35 grades are designed for low-speed machining, heavy depth of cut, roughing, and more demanding cutting conditions.

Tungsten Carbide Grades P10, P20, P25, P30, P35, P40: ISO P-Series Grade Chart

This 2026 ISO P-series tungsten carbide grade chart compares common P10, P20, P25, P30, P35, and P40 carbide grades across major global cutting tool manufacturers. ISO P-series carbide grades are mainly used for steel machining, including carbon steel, alloy steel, and cast steel applications.

P10 grades are typically selected for continuous cutting and high-speed finishing. P20 and P25 grades are suitable for general steel machining and light interrupted cutting. P30 and P35 grades are used for heavy interrupted cutting and roughing, while P40 grades are designed for low-speed, high-impact interrupted machining conditions.

ISO Tungsten Carbide Grades WC Content Chart: Composition Reference

This table shows the typical tungsten carbide (WC) content range for ISO carbide grades, including K, M, and P series. The WC content directly affects hardness, wear resistance, and toughness of the carbide material, making it a key factor in grade selection for different machining applications.

In general, higher WC content provides improved wear resistance and hardness, while lower WC content (with higher cobalt binder content) enhances toughness and impact resistance. Understanding the WC percentage helps engineers and buyers select the most suitable carbide grade for cutting conditions and workpiece materials.

Summary and Disclaimer

The tungsten carbide grade comparisons provided above are intended as a general reference to help understand the approximate equivalence between ISO grades such as K10, K20, M20, and P30 across different manufacturers. Due to variations in carbide composition, coating technology, and application-specific optimization, exact performance may differ between brands even when grades appear similar.

All brand names, grade designations, and data presented are collected from publicly available sources, including manufacturer catalogs and technical documents. This information is provided for reference purposes only and does not represent any official endorsement or direct equivalence between brands.

We specialize in custom manufacturing of tungsten carbide components, including carbide nozzles, dies, bushings, rollers, and precision wear parts. Our engineering team can recommend suitable carbide grades based on your application requirements, including material type, tolerance, and working conditions.

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