GB/T 9439-88.The title is grey iron castings.Here are the some of the details: 1 The topic contents and scope of application This standard stipulated the grey iron grades and the technical specification for castings. This
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GB/T 9439-88.The title is grey iron castings.Here are the some of the details: 1 The topic contents and scope of application This standard stipulated the grey iron grades and the technical specification for castings. This
Read more