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US 4,949,836 AGranted
Screw with wear resistant surface
AssigneeKrauss-Maffei Aktiengesellschaft
InventorHubert Schostek
Life of this patent
Estimating the term…
Abstract
A screw or other machine part subject to wear is provided with a wear-resistant layer comprising: 40-70% molybdenum, 0-10% chromium, 0.5-5% boron, 0-1% zirconium, 0-1% titanium, and the remainder being nickel, cobalt or mixtures of nickel and cobalt.
Claims5
A machine part subject to wear during use comprising:
- a steel base material configured as a plastic processing screw exhibiting screw lands, and
- a wear-resistant alloy coated on and welded to crests of said screw lands by plasma powder deposition welding ,said alloy comprising by weight:
- 40-70% molybdenum and manganese, 0-10% chromium, 0.5-5% boron, 0-1% zirconium, 0-1% titanium, and the remainder being nickel, cobalt or mixtures of nickel and cobalt.
A machine part as in claim 6 wherein said screw lands comprise a crest track having a recess into which said alloy has been welded.
Dependencies are inferred from the claim text.