The physical properties of stainless steel

    The physical properties of stainless steel are mainly expressed in the following aspects.

    ①. Coefficient of thermal expansion

    The change in the measurement element of the substance due to the change in temperature. Expansion coefficient is the slope of the expansion-temperature curve, the instantaneous expansion coefficient is the slope at a specific temperature, the average slope between the two specified temperatures is the average coefficient of thermal expansion. The coefficient of expansion can be expressed in terms of volume or length, usually in terms of length.

    ②. Density

    The density of a substance is the mass of that substance per unit volume in kg/m3 or 1b/in3.　

    ③. Modulus of elasticity

    When a force applied to the ends of a unit length of prismatic dwelling can cause a unit change in the length of the object, the force required per unit area is called the modulus of elasticity. The unit is 1b/in3 or N/m3.

    ④. Resistivity

    The resistance measured between the two opposite sides of a unit length of cubic material, expressed in Ω-m, μΩ-cm or (obsolete) Ω/(circular mil.ft).

    ⑤. Magnetic permeability

    A dimensionless coefficient indicating the degree to which a substance is susceptible to magnetisation and is the ratio of the strength of magnetic induction to the strength of the magnetic field.

    ⑥. Melting temperature range

    Determines the temperature at which an alloy begins to solidify and the temperature at which it has finished solidifying.

    (vii) Specific heat

    The amount of heat required to change the temperature of a unit mass of a substance by 1 degree. The values of specific heat are the same in both the Imperial and CGs systems, as the unit of heat (Biu or cal) depends on the amount of heat required to raise the temperature of a unit mass of water by 1 degree. The value of specific heat in the International System of Units is different from the Imperial or CGS system because the unit of energy (J) is defined differently. The units of specific heat are Btu (1b-0F) and J/(kg -k).

    ⑧. Thermal conductivity

    A measure of the rate at which a substance conducts heat. When a temperature gradient of 1 degree per unit length is established over a unit cross-sectional area of material, then thermal conductivity is defined as the amount of heat conducted per unit time, and the units of thermal conductivity are Btu/(h-ft-0F) or w/(m -K).

    ⑨. Thermal diffusivity

    is a property that determines the rate of temperature front migration within a substance and is the ratio of the thermal conductivity to the product of specific heat and density, the unit of thermal diffusivity is expressed in Btu/(h-ft-0F) or w/(m-k).

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