hardening and tempering

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• Tempering — For other uses, see Temper (disambiguation). Tempered steel. The various colors produced indicate the temperature to which the steel was heated. Light straw indicates 204 °C (399 °F) and light blue indicates 337 °C (639 °F) …   Wikipedia

• Precipitation hardening — Precipitation hardening, also called age hardening, is a heat treatment technique used to increase the yield strength of malleable materials, including most structural alloys of aluminium, magnesium, nickel and titanium, and some stainless steels …   Wikipedia

• Tap and die — Not to be confused with Tool and die. Taps and dies are cutting tools used to create screw threads, which is called threading. A tap is used to cut the female portion of the mating pair (e.g., a nut). A die is used to cut the male portion of the… …   Wikipedia

• tempering — Heat treating of metal alloys, particularly steel, to reduce brittleness and restore ductility. In tempering, steel is slowly heated to a temperature between 300 and 1,300 °F (150 and 700 °C), depending on desired properties, in an oil or salt… …   Universalium

• tempering — Synonyms and related words: abatement, abating, ability, aging, allaying, allayment, alleviating, alleviation, arteriosclerosis, assuagement, assuaging, atherosclerosis, background, blaseness, blunting, calcification, callusing, calming,… …   Moby Thesaurus

• 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… …   Mechanics glossary

• hardening — Synonyms and related words: abidingness, acclimation, acclimatization, accommodation, accustoming, adaption, adjustment, agglutination, arteriosclerosis, atherosclerosis, breaking, breaking in, calcification, callusing, case hardening,… …   Moby Thesaurus

• tempering — n. hardening of metal by heating it to high temperatures and cooling it immediately tem·per || tempÉ™(r) n. temperament, disposition; mood v. moderate, soften, tone down; toughen, harden …   English contemporary dictionary

• Diffusion hardening — Schematic cutaway view of a diffusion hardened metal gear Diffusion hardening is a process used in manufacturing that increases the hardness of steels. In diffusion hardening, diffusion occurs between a steel with a low carbon content and a… …   Wikipedia

• Differential hardening — is a method used in forging swords and knives to increase the hardness of the edge without making the whole blade brittle. To achieve this, the edge is cooled more rapidly than the spine by adding a heat insulator to the spine before quenching.… …   Wikipedia

• Cryogenic hardening — is a cryogenic heat treating process where the material is cooled to approximately −185 °C (−301 °F), usually using liquid nitrogen. It can have a profound effect on the mechanical properties of certain steels, provided their composition and …   Wikipedia