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Your search for "t" found 28 matching terms. Click here to search again.

Term	Definition
Ta	Chemical symbol for Tantalum.
Tantalum	A rare metal of silver white colour having excellent corrosion resistance and a high melting point. It is widely used for chemical process equipment and specialised aero-space and nuclear applications.
Te	Chemical symbol for Tellurium.
Tellurium	Its main use in the steel industry is as an additive in leadbearing freecutting steels to further improve their machinability. Its presence in the steel is either within the manganese sulphide particles, where it is partially soluble, or as particles combined with lead or manganese. For certain applications it offers significant improvements in machinability but the added cost is a factor that should be taken into account.
Temper	A term to which a number of definitions can be applied. These include: a) The operation of tempering; b) The degree of hardness left in a steel bar after quenching and tempering; c) The grading of the hardness of low carbon cold rolled strip, e.g. Hard, Half Hard, Quarter Hard, Skin Passed, Soft; d) An indication of the amount of carbon present in a tool steel, e.g. razor temper, file temper, die temper, etc.
Temper Brittleness	The loss in impact resistance that is present in some low and medium carbon alloy steels when tempered in the range of 350oC - 600oC. It is revealed by the notched bar impact test but not the tensile test.
Temper Colours	Before the use of instruments such as pyrometers, colours were used to judge temperatures when hardening and tempering. For example, on carbon tool steel where the tempering range may typically be from 200oC to 350oC, the colours change with the rise in temperature giving Light Straw at around 210oC, Purple at 275oC, and Grey at 330oC. The practice still continues in workshops where controlled heat treatment facilities are not available.
Temper Rolling	A light pass given to annealed cold rolled strip to prevent the formation of kinks and stretcher strain markings on subsequent cold working. Also termed Pinch pass and Skin pass.
Tempering	A heat treatment applied to ferrous products after hardening. It consists of heating the steel to some temperature below the transformation range and holding for a suitable time at the temperature, followed by cooling at a suitable rate. The object of tempering is to decrease hardness and increase toughness to produce the desired combination of mechanical properties.
Tensile Strength	The maximum load applied in breaking a tensile test piece divided by the original cross-sectional area of the test piece. Originally quoted as tons/sq.in. it is now measured as Newtons/sq.mm. Also termed Maximum Stress and Ultimate Tensile Stress.
Tensile Test	A standard test piece is gripped at either end by suitable apparatus in a testing machine which slowly exerts an axial pull so that the steel is stretched until it breaks. The test provides information on proof stress, yield point, tensile strength, elongation and reduction of area.
Thomas Process	The Continental name for the basic Bessemer steel making process, now superseded by modern day BOS plants.
Ti	Chemical symbol for Titanium.
Time Temperature Transformation Curve	An isothermal transformation diagram showing the relationship between temperature and the time taken for the decomposition of austenite when the transformation occurs at constant temperature.
Tin	When present in steel it is an undesirable impurity which gives rise to temper brittleness. When used as a coating on steel, it has a good resistance to corrosion for many applications.
Titanium	Small amounts added to steel contribute to its soundness and give a finer grain size. In austenitic stainless steels it acts as a carbide stabiliser and is used to prevent intercrystalline corrosion, commonly termed "weld decay". Titanium carbide is also used with tungsten carbide in the manufacture of hard metal tools.
Tolerances	The amount of variation permitted on dimensions or surfaces. The tolerance is equal to the difference between the maximum and minimum limits of any specified dimension.
Tool Steel	A generic term applied to a wide range of steels, both plain carbon and alloy. It includes steels suitable for various types of cutting tools, press tools, hot and cold heading dies, moulds for plastics and die- casting, extrusion tools, hand tools, etc.
Torsional Strength	The resistance of a bar to twisting. Closely related to its shear strength.
Toughness	The ability of a metal to rapidly distribute within itself both the stress and strain caused by a suddenly applied load, or more simply expressed, the ability of a material to withstand shock loading. It is the exact opposite of "brittleness" which carries the implication of sudden failure. A brittle material has little resistance to failure once the elastic limit has been reached.
Transformation Range	The temperature range within which austenite forms and ferrite or carbide progressively dissolves while ferrous alloys are being heated. Also the temperature range within which austenite decomposes to form ferrite and carbide on cooling.
Transformation Temperature	The temperature at which a change in phase occurs or the limiting temperature of a transformation range. These critical points are denoted by symbols, e.g. Ac1; the temperature at which austenite begins to form on heating. There are 12 principal temperatures to which symbols are applied.
Transition Temperature	The temperature at which a transition from ductile to brittle fracture takes place in steel. It is usually determined by making a series of Charpy impact tests at various temperatures, the transition temperature is usually taken as the point where 50% of the fracture is brittle.
Transverse Strength	A measurement of strength when the load is applied across the longitudinal flow of the grain of a metal. Certain impurities such as sulphur have a detrimental effect on the transverse strength. This can be minimised by the inclusion modification process.
Transverse Test	A test taken at right angles to the principal direction of rolling or forging.
TTT Curve	An abbreviation of Time Temperature Transformation Curve.
Tufftriding	A form of surface hardening, the process involves nitrogen but does not achieve the hardness of conventional nitriding.
Tungsten	When used as an alloying element it increases the strength of steel at normal and elevated temperatures. Its "red hardness" value makes it suitable for cutting tools as it enables the tool edge to be maintained at high temperatures. In conjunction with other alloying elements it finds applications in heat resisting and other severe service conditions.

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