The density and specific heat of carbon tool steel. Physical and mechanical properties.
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Instrumental carbon steels are used for the production of cutting, stamping and measuring tools, both manual and machine. A common feature of such steels is that when heat treated, they do not calcinate at a significant depth.
Not having in their composition alloying components (with the exception of those which are inevitably present in small amounts of copper and manganese), such steels have very high critical cooling rates, which upon quenching in aqueous media can be achieved only at small cross sections of the tool (or only in its surface layers). Since the hardenability is low, the internal volumes of the tool remain viscous.
The property of increased viscosity also has a positive side: carbon tool steels do not collapse under shock loads not exceeding the ultimate strength of steel. In this case, the degree of viscosity depends on the percentage of carbon. Particularly viscous are the steels, in which the amount of carbon is in the range 0.7… 0.9%, the steels of medium viscosity are those with 0.95… 1.05% carbon, and low-viscosity steels with a greater than 1.05%, The percentage of carbon.
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Physical and mechanical properties
After annealing, the steels in question have the following performance indicators:
Mechanical properties of carbon tool steels after preliminary
|Steel grade||Hardness according to Brinell, HB, not more than||The limit of time resistance , MPa||Yield strength, MPa||Elongation at stretching, %||Relative narrowing, %||Ferrite,%||Carbides,%|
|The carbide phase is in the form of cementite Fe 3 C.|
|Physical properties of carbon tool steels after annealing|
|Steel||H with 10 -2, A / m||Μ max 10 -5, HN / m||4πJ s, Tl||Р 1 10 -6, Ohm||Р, kg / m 3|
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