DH31-S high-performance high-strength hot-work tool steels, high strength, toughness and high resistance to thermal cracking performance.
 
Daido Steel Co., Ltd. of Japan produced DH31S good fatigue resistance High temperature resistance strength is suitable for large-scale die-casting mold materials. Large-scale die-cast aluminum and magnesium die casting molds.
 
Characteristics: Good workability good fatigue resistance, good hardenability
 
Applications: metal die casting, extrusion die
 
Heat treatment:
 
DH31-S annealed to about HB190 good hardenability, excellent resistance to thermal fatigue cracking resistance, good resistance to hot-melt damage.
 
Heat treatment temperature:
 
820-870 ℃ (1510-1600 ° F) annealing, using the slow cooling; 1000-1050 ℃ (1830 - 1920 ° F) under the hardened, the use of air-cooled, gas cooled or oil cooled .550-650 ℃ (1020 - 1200 ° F), the tempering, the use of air-cooled phase change temperature of 805 ℃ (1480 ° F).