Die casting dies are made in at least two sections called the stationary die half and the moving die half. The dies fit together to form the die cavity, which fills with molten metal.

• The dies are made of alloy tool steels. These tool steels have the strength, wear resistance, and thermal durability to withstand thousands of molten metal injections.

• Two ultrahigh strength tool steels used for dies are H11 and H13. These alloys have tensile strengths and hardnesses as high as 300 ksi and 56 Rockwell C, depending on heat treatment