Red-short, hot-short refers to brittleness of steels at red-hot temperatures. It is often caused by high sulfur levels, in which case it is also known as sulfur embrittlement.
DescriptionEdit
Iron or steel, when heated to above 460 °C (900 °F), glows with a red color. The color of heated iron changes predictably (due to black-body radiation) from dull red through orange and yellow to white, and can be a useful indicator of its temperature. Good quality iron or steel at and above this temperature becomes increasingly malleable and plastic. Iron or steel having too much sulfur, on the other hand, becomes crumbly and brittle. This is due to the sulfur forming iron sulfide/iron mixtures in the grain boundaries of the metal which have a lower melting point than the steel.[1]
When the steel is heated up and worked, the mechanical energy added to the workpiece increases the temperature further. The iron sulfide (FeS) or iron/iron sulfide alloy (which has an even lower melting point)[2] begins to melt, and the steel starts to separate at the grain boundaries. Steelmakers add manganese (Mn) to the steel when it is produced, to form manganese sulfide (MnS). Manganese sulfide inclusions have a higher melting point and do not concentrate at the grain boundaries. Thus, when the steel is later heated up and worked, the melting at the grain boundaries does not occur.
ReferencesEdit
^Deev et al. (May–June 1982). "Role of iron sulfide in the formation of cracks in weld joints". Materials Science, Vol. 18, No. 3, pp. 109–112.
^Sachinath Mitra. High-pressure geochemistry and mineral physics. p. 1028.
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short, carbon, steel, short, short, refers, brittleness, steels, temperatures, often, caused, high, sulfur, levels, which, case, also, known, sulfur, embrittlement, description, editiron, steel, when, heated, above, glows, with, color, color, heated, iron, cha. Red short hot short refers to brittleness of steels at red hot temperatures It is often caused by high sulfur levels in which case it is also known as sulfur embrittlement Description EditIron or steel when heated to above 460 C 900 F glows with a red color The color of heated iron changes predictably due to black body radiation from dull red through orange and yellow to white and can be a useful indicator of its temperature Good quality iron or steel at and above this temperature becomes increasingly malleable and plastic Iron or steel having too much sulfur on the other hand becomes crumbly and brittle This is due to the sulfur forming iron sulfide iron mixtures in the grain boundaries of the metal which have a lower melting point than the steel 1 When the steel is heated up and worked the mechanical energy added to the workpiece increases the temperature further The iron sulfide FeS or iron iron sulfide alloy which has an even lower melting point 2 begins to melt and the steel starts to separate at the grain boundaries Steelmakers add manganese Mn to the steel when it is produced to form manganese sulfide MnS Manganese sulfide inclusions have a higher melting point and do not concentrate at the grain boundaries Thus when the steel is later heated up and worked the melting at the grain boundaries does not occur References Edit Deev et al May June 1982 Role of iron sulfide in the formation of cracks in weld joints Materials Science Vol 18 No 3 pp 109 112 Sachinath Mitra High pressure geochemistry and mineral physics p 1028 This industry related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Red short carbon steel amp oldid 1152155987, wikipedia, wiki, book, books, library,
