ASTM B930 is the standard test method for rating grain size and the frequency of abnormally large grains in cemented tungsten carbides (hardmetals). It provides a consistent way to assess microstructural quality in a material where grain size can influence performance, wear behavior, and reliability. By offering a common evaluation approach, this ASTM standard helps users compare results more confidently and supports quality control, product acceptance, and technical communication.

Overview of ASTM B930

The official standard title shows that ASTM B930 focuses on evaluating two related features of cemented tungsten carbides: grain size and the occurrence of unusually large grains. This is important because hardmetals are often selected for demanding service conditions, and their microstructure can affect how they perform in use. ASTM B930 is therefore a useful technical document for rating and reporting material condition in a more consistent, standardized way.

Common use cases of ASTM B930

ASTM B930 is commonly used when cemented tungsten carbide materials need to be examined for microstructural quality during manufacturing, incoming inspection, or product evaluation. It is relevant in workflows that involve hardmetals where grain structure must be rated rather than described informally. The standard may also support communication between suppliers and buyers by giving both sides a shared basis for assessing grain size and abnormally large grains.

Benefits of using ASTM B930

Using ASTM B930 helps improve consistency in how cemented tungsten carbide microstructures are rated and reported. That can support quality control, reduce ambiguity in procurement or acceptance decisions, and make it easier to compare material lots or test results. For organizations working with hardmetals, the standard also helps reduce risk by providing a recognized method for evaluating a feature that may affect overall material performance.

• Ratings for grain size in cemented tungsten carbides
• Assessment of abnormally large grains
• Consistent microstructural evaluation
• Useful for quality control and acceptance checks
• Supports clear supplier and buyer communication