Particulate CaF.sub.2 agent for improving the machinability of sintered iron-based powder
AssigneeHöganäs AB
InventorOwe Andersson
Life of this patent
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Abstract
The invention relates to an additive for improving the machinability of iron-based powder compositions. The additive contains calcium fluoride particles which are included in an amount of 0.1-0.6% by weight in the powder composition. The invention further relates to powder compositions containing the additives indicated, as well as sintered products produced from the powder compositions.
Claims14
An iron-based powder composition essentially free from hard phase material for compacting and sintering into products having enhanced machinability, said composition comprising, in addition to iron, at least one of the alloying elements C, P, Cr, Mn, Cu, Ni and .ltoreq. 2% by weight Mo, the iron-based powder including 0.1-0.6% by weight of CaF.sub.2 powder particles as agent for improving the machinability, the particles of the CaF.sub.2 powder being unattached to graphite particles, the CaF.sub.2 powder being optionally combined with one or more conventional machinability-improving agents and essentially no elementary sulfur being present in the agent(s) for improving the machinability of the sintered products.
A sintered product having enhanced machinability and being essentially free from hard phase material, said product comprising 0.1-1.2% by weight C, 0-0.6% by weight P, 0-25% by weight Cr, 0-10% by weight Mn, 0-5% by weight Cu, 0-8% by weight Ni, and 0-2% by weight Mo, as well as 0.1-0.6% by weight CaF.sub.2 and a balance of iron or steel.
Dependencies are inferred from the claim text.