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Lamella heat exchangers, Laminar flow: Laminar flow control, of boundary layers, Lancaster, J F, Langelier index for water quality, Large eddy simulation, in prediction of turbulent boundary layers, Laws for turbulent flows: Layers of fluid, free convection heat transfer in, Le Fevre equations for free convective heat transfer, Leakage between streams, in shell-and-tube heat exchangers Leakage effects, on heat transfer and pressure drop in shell-and-tube heat exchangers, Leaks, in heat exchanger, sealing by explosive welding, Lebedev, M E, Lee and Kesler equation, for vapour pressure, L-footed fins, Lessing rings, characteristic of, as packings for fixed beds, Li equation, for critical temperature of mixtures, Lienhard and Dhir analysis of critical heat flux in pool boiling, Lienhard and Eichhorn criterion, for transition in critical heat flux mechanism in crossflow over single tube, Lift force: Liley, P E, Limb, D, Limpet coils: Linnhoff, B, Liquefaction, exergy analysis of, Liquid fluidized beds, Liquid fuels, properties of, Liquid hold-up, Liquid-liquid-gas flow, Liquid-liquid flow, Liquid metals: Liquid sheets, in direct contact heat transfer, Liquid-solid interfaces, fouling at, Liquids: Lister, D H, Local conditions hypothesis, for critical heat flux in flow boiling, Lockhart and Martinelli correlations: Lodge's rubberlike liquid (non-Newtonian), Logarithmic law region, Logarithmic mean temperature difference Longitudinal flow and heat transfer in tube banks, Long-tube vertical evaporator, Loss coefficient, Lost work in unit operations/exergy analysis, Louvered fins, in plate fin exchangers, Low-alloy steels: Low-finned tubes: Low-nickel steels, Lubricants, physical properties: Lucas methods
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Carbon and Low-Alloy Steels

DOI 10.1615/hedhme.a.000434

4.5.4 Carbon and low-allow steels

A. Material definitions

Carbon steels, sometimes referred to as plain carbon steels, consist essentially of iron with with deliberate additions of carbon in the approximate range 0.05 to 1% by weight.  However, chemical analyses will show the presence of silicon and manganese, which are added to all pressure vessel steels to combine with detrimental impurities such as oxygen and sulfur to reduce their effects. Thus, a typical analysis of a carbon steel will show silicon in the range 0.10 to 0.35% and manganese 0.30 to 1.0%.

Plain carbon steels are generally categorized into three broad groups according to the level of carbon present:

  • Up to 0.30%-low-carbon (or mild) steels

  • 0.30 to 0.60%-medium-carbon steels

  • 60 to 1.0%-high-carbon steels

Carbon is a very powerful strengthening element, but as a rule the higher the carbon level the lower the ductility of the steel and the poorer its weldability. For heat exchangers, all the plain carbon steels used for the pressure parts will be low-carbon steels.

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