Martensitic hot work tool steel die block article and method of

Details Martensitic hot work tool steel die block article and method of Martensitic hot work tool steel die block article and method of

1993-09-27

1995-09-05

Walsh, Donald P.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having metal particles

428546, 428551, 419 38, 419 42, 419 43, 419 49, 419 54, 419 55, 420 87, 420104, 420105, 420124, B22F 314, B22F 316

Patent

active

054478006

ABSTRACT:
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.degree. F. and 600.degree. 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.

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