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GB/T 9439 Standard for Gray Cast Iron
This is a Chinese standard for stipulating the physical properties of gray cast iron, or called as grey cast iron. It’s similar to the other standards for gray iron such as DIN 1691 in
According to the measured in minimum tensile strength value of the standard tensile samples that machined from separately cast test-bar with a diameter 30mm, the gray cast iron will be divided into HT-100, HT-150, HT-200, HT-250, HT-300 and HT-350 as below:
