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Your search for "n" found 13 matching terms. Click here to search again.

Term	Definition
N	Chemical symbol for Nitrogen.
Na	Chemical symbol for Sodium.
Nb	Chemical symbol for Niobium.
Ni	Chemical symbol for Nickel.
Nickel	One of the most widely used alloying elements in steel. In amounts 0.50% to 5.00% its use in alloy steels increases the toughness and tensile strength without detrimental effect on the ductility. Nickel also increases the hardenability, thus permitting the steel to be oil- hardened instead of water quenched. In larger quantities, 8.00% and upwards, nickel is the constituent, together with chromium, of many corrosion resistant and stainless austenitic steels.
Niobium	Also known as columbium. Niobium is a strong carbide forming element which is added to certain 18/8% chromium-nickel stainless steels as a stabiliser to prevent inter-granular corrosion arising from welding.
Nitriding	A case hardening process that depends on the absorption of nitrogen into the steel. All machining, stress relieving, as well as hardening and tempering are normally carried out before nitriding. The parts are heated in a special container through which ammonia gas is allowed to pass. The ammonia splits into hydrogen and nitrogen and the nitrogen reacts with the steel penetrating the surface to form nitrides. Nitriding steels offer many advantages: a much higher surface hardness is obtainable when compared with case-hardening steels; they are extremely resistant to abrasion and have a high fatigue strength.
Nitrogen	Nitrogen is a gas that forms approximately 79% by volume or 77% by weight of the atmosphere. It can combine with many metals to form nitrides and is thus applied to the case-hardening of steel, the usual source for this purpose being ammonia.
Noble Metals	Metals such as gold, silver and platinum which are resistant to corrosion by all but the most powerful acids.
Non Destructive Testing	Those forms of testing that do not result in permanent damage or deformation to the part being tested. Typical examples are magnetic crack detection, ultrasonic inspection, X-Ray inspection and gamma radiography.
Non Magnetic Steels	Austenitic steels such as the 14% manganese steels and the 303 type 18/8% chromium-nickel stainless steels.
Normalising	A heat treatment process that has the object of relieving internal stresses, refining the grain size and improving the mechanical properties. The steel is heated to 800-900oC according to analysis, held at temperature to allow a full soak and cooled in still air.
Notched Bar Test	A test to determine the resistance of a material to a suddenly applied stress, i.e. shock. A notched test piece is employed in an Izod or Charpy machine and the results are recorded in ft.lbs. or Joules.

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