## Physical properties of stainless steel

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

##### ①. Coefficient of thermal expansion

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

##### ②. Density

The density of a substance is the mass per unit volume of that substance 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 two opposite sides of a unit length of cubic material is expressed in units of Ω-m, μΩ-cm or (obsolete) Ω/(circular mil.ft).

##### ⑤. Magnetic permeability

A dimensionless coefficient that indicates the degree to which a material is susceptible to magnetization and is the ratio of magnetic induction strength to magnetic field strength.

##### ⑥． Melting temperature range

Determines the temperature at which the 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 the Imperial and CGs systems because 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 on a unit cross-sectional area of material, then thermal conductivity is defined as the 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 thermal conductivity to the product of specific heat and density, and the unit of thermal diffusivity is expressed as Btu/(h-ft-0F) or w/(m-k).