Cylinder member and nickel-based facing alloys

A cylinder member selected from the group of a valve, a seat portion, a piston and a cylinder liner, in an internal combustion engine, particularly a large two-stroke crosshead engine, wherein the member is provided with a welded high-temperature corrosion-resistant facing alloy being at an operating temperature at normal running of the engine, said welded facing alloy having a hardness which has been increased by means of a precipitation hardening mechanism based on a solid-state phase transformation, the facing alloy having a temperature of activation of the precipitation hardening mechanism that is above the operating temperature of the alloy, and the precipitation hardening mechanism acting so slowly, that the alloy substantially has not hardened at welding on the cylinder member, but has hardened during a subsequent heat treatment at a temperature higher than the activation temperature for the precipitation hardening mechanism.

A cylinder member, such as a valve, a seat portion, a piston or a cylinder liner, in an internal combustion engine, particularly a large two-stroke crosshead engine, wherein the member is provided with a welded high-temperature corrosion-resistant facing alloy, which facing alloy, expressed in percentage by weight and apart from commonly occurring impurities, comprises from 40 to 51% Cr, from 0 to 0.1% C, less than 1.0% Si, from 0 to 5.0% Mn, less than 1.0% Mo, from 0.05 to less than 0.5% B, from 0 to 1.0% Al, from 0 to 1.5% Ti, from 0 to 0.2% Zr, from 0.5 to 3.0% Nb, an aggregate content of Co and Fe of maximum 5.0%, maximum 0.2% O, maximum 0.3% N and the balance Ni.