Corrosion and wear resistant alloy

Abstract

An iron-based corrosion resistant and wear resistant alloy. The alloy can comprise (in weight percent) 0.005-0.5% boron, 1.2-1.8% carbon, 0.7-1.5% vanadium, 7-11% chromium, 1-3.5% niobium, 6-11% molybdenum, and the balance including iron and incidental impurities. Alternatively, the Nb content can be replaced or combined with Ti, Zr, Hf and / or Ta such that 1%<(Ti+Zr+Nb+Hf+Ta)<=3.5. The alloy has improved hot hardness and high temperature compressive strength and is suitable for use in elevated temperature applications such as in diesel valve seat inserts.

Description

field of invention

[0001] The invention relates to a high-temperature corrosion-resistant and wear-resistant iron-based alloy; in particular, it relates to an alloy used as a valve seat insert. Background of the invention

[0002] Tighter diesel engine exhaust emissions laws have led to changes in engine design, including the need for high-voltage electronic fuel injection systems. Engines built to the new design use higher combustion pressures, higher operating temperatures, and less lubrication than previous designs. The newly designed components include the valve seat insert (VSI), which has a fairly high wear rate. Exhaust valve seat inserts and valves, for example, must be able to withstand multiple valve impact events and combustion events with minimal wear, such as frictional, adhesive, and corrosive wear. This has driven material selection towards more wear resistant materials compared to seat insert materials typically used in the diesel engine ...

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