Glossary - N
An age-hardening process which takes place at room temperature. A mixture of hydrocarbon gases which occur naturally and are recovered for commercial use. LPG is extracted from natural gas because of its greater commercial value. Natural gas used for industrial applications is predominantly methane. A technique in which components are machine cut to minimise wastage and distortion. Also called a normal or working flame, it occurs when there is neither excess oxygen or fuel present. The sum of austenite forming elements, and used in conjunction with Chromium Equivalent, plotted in constitution diagrams (Schaeffler, DeLong, and WRC) for the estimation of phases in stainless steels weld metal, and calculated from various equations, such as: Nieq = %Ni + 30x%C + 0.5x%Mn Alloys which cannot be strengthened or hardened by application of heat.
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