What are the differences between tool steel and cast iron plungers?
Plungers for zinc die casting are commonly produced in either cast iron, or tool steel (H-13). Cast iron plungers can be produced in a near net shape, reducing the amount of machining required to produce a functional part. However, they are susceptible to mechanical failure due to the nature of the casting. Tool steel plungers are produced from bar stock, and require extensive machining to produce a comparable finished part. The mechanical properties of the tool steel plunger are far superior to those of cast iron, which usually justifies the increased cost. Heat treating can increase the durability of the part even further. Top 5: How much clearance is required between the plunger and the gooseneck in a conventional hot chamber zinc machine? The general rule for clearance between the plunger and the gooseneck sleeve for a conventional hot chamber zinc machine is .002″ per inch of plunger diameter. For example, a 2-1/2″ plunger would have .002″ x 2-1/2 or .005″ clearance. This clearanc
