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| YB/T 4290-2012 Test Methods for Estimating the Largest Grain Observed in a Metallographic Section (ALA Grain Size) (English Version) |
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Introduction of YB/T 4290-2012
本标准规定了在金相检测面上测定所观察到的最大晶粒尺寸级别（ALA晶粒度）的试验方法。
本标准仅适用于包含异常粗大晶粒的显微组织，这种粗大晶粒因分布太稀疏而无法用GB/T 6394-2002标准测量其晶粒度。
Contents of YB/T 4290-2012