International Mold Steel announces two new grades added to the NADCA approval catalogBy [email protected] / January 30, 2024 DHA-World: Premium H-13 is beginning to dominate the Asian market, and is now certified by NADCA to 207 Grade F. DH31-EX: The leader in performance for high strength hot work die steels is now certified to NADCA to 207 Grade C. DHA-WORLD DH31-EX