The density and specific heat capacity of boiler steel. Physical and mechanical properties.
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The most important performance characteristics of all boiler steels is the stability of indicators of the specific heat, thermal conductivity and density in a given temperature range (usually — not less than 350…4000 C). For example, one of the best in this class of boiler steels — steel 15ХМФ — physical properties meet the standards of the following table:
|Operating temperature, 0 With||The modulus of elasticity, GPA||Thermal diffusivity, hail-1||Thermal conductivity, W/MK||Density, kg/m3|
Thus, for boiler steels of this type acceptable temperature range is 20…6000 C.
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Features of the thermophysical parameters of boiler steels
Boiler steel is different from the usual for its elevated characteristics of plasticity and less prone to hardening after plastic deformation and rolling. This allows the introduction of an intermediate annealing to produce a sheet metal hood or flexible enough intricate details of steam and hot water boilers. The tightness is ensured also by the absence of cracking during heating and after zaccarian connections.
Given that the Assembly line is often used welding, all brands of boiler steels have a high capacity for welding.
An important feature of boiler steels is the temperature of the beginning scaling (it doesn’t matter only for structures that are constantly cooled with water).
Given the risks with the tightness of boilers and other steam installations, all profiles of boiler steel sheet are subjected to ultrasonic testing of steel sheet. For low-quality heats of the possible pores, which are formed during cooling of the material subjected to hot rolling.
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