| 摘要 |
A martensitic hot work tool steel die block for use in the manufacture of die casting die components and other hot work tooling components and a method for manufacturing the same. The article has a hardness within the range of 35 to 50 HRC and a minimum transverse Charpy V-notch impact toughness of 5 foot pounds when heat treated to a hardness of 44 to 46 HRC and when tested at both 72 DEG F and 600 DEG F. The article is a hot worked, heat treated and fully dense consolidated mass of prealloyed particles of the composition , in weight percent, 0.32 to 0.45 carbon, 0.20 to 2.00 manganese, 0.05 to 0.30 sulfur, up to 0.03 phosphorous, 0.80 to 1.20 silicon, 4.75 to 5.70 chromium, 1.10 to 1.75 molybdenum, 0.80 to 1.20 vanadium, and balance iron. The alloy may be any conventional wrought AISI hot work tool steel or wrought maraging or precipitation-hardening steel having 0.05 to 0.30 percent sulfur, and having sulfide particles which exhibit a maximum size of 50 microns in their longest dimension. The article is manufactured by compacting of prealloyed particles of the aforementioned composition followed by hot working, annealing hardening and tempering. <IMAGE> |
