Crucible Materials Corporation

William Stasko

Kenneth E Pinnow

Carl J Dorsch

John J Hauser

Edward J Dulis

Andrzej L Wojcieszynski

A powder-metallurgy produced high-speed steel article having a combination of high hardness and wear resistance, particularly at elevated temperatures. This combination of properties is achieved by the combination of W, Mo, V, and Co. The article is particularly suitable for use in the manufacture of gear cutting tools, such as hobs, and surface coatings.

High-speed steel article

A hot-worked, fully dense, wear resistant, vanadium-rich, powder metallurgy cold work tool steel article having improved impact toughness. This is achieved by controlling the amount, composition and size of the primary carbides and by insuring that substantially all the primary carbides remaining after hardening and tempering are MC-type vanadium-rich carbides. The article is produced by hot isostatic compacting of nitrogen atomized powder particles.

Wear resistant, powder metallurgy cold work tool steel articles having

A high vanadium, powder metallurgy cold work tool steel article and method for production. The nickel, chromium, vanadium, and carbon plus nitrogen contents of the steel are controlled during production to achieve a desired combination of corrosion resistance, metal to metal wear resistance, and hardenability.

Corrosion resistant, high vanadium, powder metallurgy tool steel

A high vanadium, powder metallurgy cold work tool steel article and method for production. The chromium, vanadium, and carbon plus nitrogen contents of the steel are controlled during production to achieve a desired combination of corrosion resistance and metal to metal wear resistance.

A powder-metallurgy produced tool steel article of a hot worked, fully dense, consolidated mass of prealloyed particles of a tool steel alloy having a sulfur content within the range of 0.10 to 0.30 weight percent and a maximum sulfide size below about 15 microns.

Sulfur-containing powder-metallurgy tool steel article

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.

Martensitic hot work tool steel die block article and method of

A martensitic hot work tool steel mold and die block article for use in the manufacture for molds for plastic injection molding, die casting die components, and other hot work tooling components. The article has a hardness within the range of 35 to 50 HRC, a minimum Charpy V-notch impact toughness of 3 foot pounds when heat treated to a hardness of 44 to 46 HRC and when tested both at 72.degree. F. and 600.degree. F. The article is an as hot-isostatically-compacted, fully dense, heat-treated mass of prealloyed particles which contain sulfur within the range of 0.05 to 0.30 weight percent. The hot work tool steel includes maraging and precipitation-hardening steels of this type.

Hot-isostatically-compacted martensitic mold and die block article and

Prealloyed high-vanadium, cold work tool steel particles are provided for use in the powder-metallurgy production of tool steel articles. The particles are of a cold work tool steel alloy having an MC-type vanadium carbide dispersion of a carbide particle size substantially entirely less than 6 microns and in an amount of 18.5 to 34.0% by volume. The particles are produced by atomizing a molten tool steel alloy at a temperature above 2910.degree. F. and rapidly cooling the atomized alloy to form solidified particles therefrom. The particles have the MC-type vanadium carbide dispersion therein.

Prealloyed high-vanadium, cold work tool steel particles

Prealloyed high-vanadium, cold work tool steel particles and methods for

A powder metallurgy produced high speed tool steel article comprising a mixture of prealloyed high speed tool steel particles coated with a hard, wear resistant material, such as a carbide or nitride, mixed with prealloyed high speed tool steel uncoated particles; the particles are compacted to essentially full density and the hard, wear resistant material is at the boundaries of the coated particles and contained in a continuous matrix of the high speed tool steel. The article is produced by hot compacting a particle charge to essentially full density of a mixture of the coated and uncoated particles.

Powder metallurgy high speed tool steel article and method of manufacture

A powder-metallurgy alloy article having a good combination of wear resistance and corrosion resistance. The article is further characterized by an attainable minimum hardness after heat treatment of 60R.sub.c and a martensitic structure. The article is made from prealloyed particles of the composition, in percent by weight, carbon 2.5-5, manganese 0.2-1, phosphorus 0.10 maximum, sulfur 0.10 maximum, silicon 1 maximum, nickel 0.5 maximum, chromium 15-30, molybdenum, 2-10 vanadium 6-11, nitrogen 0.15 maximum and balance, iron. The article has a fine, uniform distribution of a MC and other carbide phases.

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West Homestead, PA, United States of America

William Stasko