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Can ductile iron be used for stamping dies? What are the advantages of using it for steel plates below 1mm? thank you
Yes, you can.

Cast iron stamping dies are widely used to produce automobile panels, and are suitable for drawing forming stamping of thin plates below1.2 mm. The stamping dies for automobile four doors and two lids usually use cast iron, as shown in the following figure and the following links:

Web page link

Grey iron HT300 is generally used as the mold base of cast iron mold, and ductile iron QT550 and QT600 are used as modeling molds. Its advantages are strong rigidity, wear resistance and low cost. And can be used as a large forming punch. Steel plate is limited by die rolling industry, and the width of hard material (D2, Cr 12MoV, etc. ) templates are mostly within 600mm and need to be spliced.

It should be noted that the width of soft materials such as A3 and 45 steel for die steel plates is not limited, and they are all 2 meters wide.