Hard surfacing alloy with precipitated bi-metallic tungsten chromium metal carbides and process

A process of manufacture of a high temperature resistant and corrosion resistant alloy having precipitated bi-metallic chromium tungsten carbides, chromium carbides and tungsten carbides comprising the steps of:

• a) formulating a melt of from about 15% to about 18% tungsten, from about 14% to about 18% chromium and an effective amount of carbon for forming carbides with the tungsten and chromium, from about 2% to about 5% iron, from about 2% to about 5% boron, from about 2% to about 5% silicon, and the balance being nickel;
• b) raising the melt of step (a) to a temperature of greater than 2500.degree. F.;
• and
• c) atomizing the melt with rapid solidification wherein a powdered alloy containing precipitated tungsten carbides, chromium carbides and bi-metallic tungsten and chromium carbides is produced.

A nickel-based hard surfacing alloy having a Rockwell C hardness of from about 50 to about 70 consisting essentially of from about 15% to about 18% tungsten;

• from about 14% to about 18% chromium;
• from about 0.5% to about 1% carbon;
• from about 3% to about 4% of silicon;
• from about 3.5% to about 5% iron and from about 2% to about 4% boron;
• and
• with the balance being nickel, said alloy including precipitated crystals of tungsten carbides, chromium carbides, and bi-metallic chromium and tungsten carbides.