The newly revised GB/T 9439-2023 in 2023 is based on GB/T 9439-2010 and modified using the international standard ISO 185:2020.According to the new national standard,the content with significant changes was introduced,including normative reference documents,gray cast iron grades,technical requirements,sample preparation,test methods,and inspection rules,etc..And it is also analyzed and compared with the old standard to gain a deeper understanding and application of the new standard.
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