Glass in the molding, the melt temperature is very high, up to 1300-1400C, into the forming of about 1060C, the molding cavity surface temperature will reach 600-800C, the mold is often caused by a partial oxidation, peeling, growth or large area pitting, because of mold clamping, mechanical impact, folder material, stress and deformation and other factors, resulting in mold seam thick, resulting in product obsolescence, so the glass molding mold material have high requirements for the new special steel HQ 40 is a pre-hardened glass mold steel, the forging temperature of the steel forging in the 850-860C 1150-850C, annealing furnace cooling to 350C, cooled baked, the aging treatment temperature is 670-680C14 hour followed by air cooling, up to the hardness HRC25-26. provided the material has been the treatment of pre hard forgings shall be chrome-plated after machining molding can be directly used as glass molding of the HQ-40 steel has a good hot and cold processing performance, compared with high resistance to hot and cold fatigue properties of a very superior antioxidant capacity, excellent thermal touch performance, and has a higher adhesion of the glass temperature and good mold release and solderability complementary excellent performance of the HQ-40 steel at Japan GLD29 (CR-CO-V system) steel, the cost of steel is only 3/5 of GLD2 HQ-40 steel used in the manufacture of glass bottles, cans, glass, kinescope, vehicle lights, lighting, etc. mold, especially on the glass melting temperature, high molding temperature, the surface requiring high quality glass mold, the effect is particularly prominent example; HQ-40 steel punch, base, mold machining and grinding. surface roughness up to RA0.13 (10.9), for the pressing temperature of 1400C glass-ceramic heat frying pan ware mold (size 200200MM) to suppress the 10000 mode, the punch and the base surface roughness RA0.35 (9), the mold can still continue to use the punch and the base face no orange peel, pit, split hair, oxide defects such as the original silicon molybdenum iron ball (4.5% S1 is-1.6MO) or 3CR13 stainless steel punch and the base of the life of respectively 460 and 1400 mode, respectively, 21.7 and 7.2 times the service life of the HQ-40 steel. 
 HQ-40 Advisory: http://www.xiangyi99.com