Interpretation of standard GB/T 7216—2023 Metallographic test for gray cast iron

doi:10.13251/j.issn.0254-6051.2025.04.050

Abstract

Abstract: Based on comparison with GB/T 7216—2009, GB/T 7216—2023 was interpreted from standard application scope, terms and definitions, inspection items, rating images, and result representation. In GB/T 7216—2023, the application scope of the standard, the measurement methods and reference images for various types of microstructure are changed. Terms and definitions, the calculation method of graphite content, and examples of graphite shape length expressions are added. In the appendix part, the comparison with ISO 945-1: 2019, the typical flake graphite distribution patterns, and image analysis identification methods for graphite types are added.

Key words: gray cast iron, flake graphite, carbide, phosphorus eutectic, eutectic clusters count

CLC Number:

TG251
N65

Zhang Zhenwei, Ma Yuchen, Zhao Jie, Jiang Rui, Chen Min, Li Shuang, Li Shu. Interpretation of standard GB/T 7216—2023 Metallographic test for gray cast iron[J]. Heat Treatment of Metals, 2025, 50(4): 323-329.

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