The name of the physical property of iron and steel material. Symbol of quantity. Unit symbol Meaning
1. Density P g/cm3 Density is the mass per unit volume of a substance
2. Thermal properties (1) Melting point °C Melting temperature of metal materials when they are changed from solid state to liquid state
(2) specific heat capacity c J/(kg•K) mass of a certain substance, when the temperature is increased by 1 °C when the heat or temperature drop by 1 °C when the heat released
(3) Thermal conductivity ג nbsp W/(m•K) Per unit area allowable heat transfer when the temperature is reduced by 1°C per unit length along the heat flow direction per unit time
(4) Linear expansion coefficient aL 10-6/K The ratio of the length of the metal to the original length for each 1°C increase in temperature
3. Electrical properties (1) Resistivity Ϡ0•m is a parameter that represents the electrical conductivity of an object. It is equal to 1m long, with a cross-sectional area of ​​1mm2 between the two ends of the wire resistance. It can also be represented by the resistance between two parallel faces of a unit cube
(2) The temperature coefficient of resistance aϠ1/°C The ratio of the change in the resistivity of the material to the original resistivity, which is called the temperature coefficient of resistance, for each temperature rise and fall of 1°C.
(3) Conductivity The reciprocal of the resistivity of S/m or %IACS is called conductivity. It is numerically equal to the current flowing through the unit area when the conductor maintains a unit potential gradient.
4. Magnetic properties (1) Magnetic permeability μ H/m is a measure of the degree of difficulty in the magnetization of magnetic materials. It is the ratio of magnetic induction (B) and magnetic field (H) in magnetic materials. Magnetic materials are generally divided into two categories: soft magnetic materials (μ values ​​are very high, up to tens of thousands) and hard magnetic materials (μ values ​​are about 1).
(2) Magnetic Intensity The magnetization process in a magnetic medium can be viewed as adding a new magnetic field, determined by magnetization (J), equal to 4 πJ, to the original magnetic field strength (H), and thus to the magnetic field. The magnetic field in the medium B = H + 4 лJ, called magnetic induction intensity
(3) Magnetic field strength H A/m A magnetic field is generated around the current passing through the conductor. The magnitude of the force exerted by the magnetic field on the original magnetic moment or current is the characterization of the magnetic field strength
(4) Coercivity H & A A A / / / / / / / æ ·å“ æ ·å“ æ ·å“ æ ·å“ æ ·å“ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ Ñ Ñ Ñ Ñ Ñ.
(5) Iron loss P W W/kg Ferromagnetic materials consume energy due to hysteresis and eddy current effects under dynamic magnetization conditions
1. Density P g/cm3 Density is the mass per unit volume of a substance
2. Thermal properties (1) Melting point °C Melting temperature of metal materials when they are changed from solid state to liquid state
(2) specific heat capacity c J/(kg•K) mass of a certain substance, when the temperature is increased by 1 °C when the heat or temperature drop by 1 °C when the heat released
(3) Thermal conductivity ג nbsp W/(m•K) Per unit area allowable heat transfer when the temperature is reduced by 1°C per unit length along the heat flow direction per unit time
(4) Linear expansion coefficient aL 10-6/K The ratio of the length of the metal to the original length for each 1°C increase in temperature
3. Electrical properties (1) Resistivity Ϡ0•m is a parameter that represents the electrical conductivity of an object. It is equal to 1m long, with a cross-sectional area of ​​1mm2 between the two ends of the wire resistance. It can also be represented by the resistance between two parallel faces of a unit cube
(2) The temperature coefficient of resistance aϠ1/°C The ratio of the change in the resistivity of the material to the original resistivity, which is called the temperature coefficient of resistance, for each temperature rise and fall of 1°C.
(3) Conductivity The reciprocal of the resistivity of S/m or %IACS is called conductivity. It is numerically equal to the current flowing through the unit area when the conductor maintains a unit potential gradient.
4. Magnetic properties (1) Magnetic permeability μ H/m is a measure of the degree of difficulty in the magnetization of magnetic materials. It is the ratio of magnetic induction (B) and magnetic field (H) in magnetic materials. Magnetic materials are generally divided into two categories: soft magnetic materials (μ values ​​are very high, up to tens of thousands) and hard magnetic materials (μ values ​​are about 1).
(2) Magnetic Intensity The magnetization process in a magnetic medium can be viewed as adding a new magnetic field, determined by magnetization (J), equal to 4 πJ, to the original magnetic field strength (H), and thus to the magnetic field. The magnetic field in the medium B = H + 4 лJ, called magnetic induction intensity
(3) Magnetic field strength H A/m A magnetic field is generated around the current passing through the conductor. The magnitude of the force exerted by the magnetic field on the original magnetic moment or current is the characterization of the magnetic field strength
(4) Coercivity H & A A A / / / / / / / æ ·å“ æ ·å“ æ ·å“ æ ·å“ æ ·å“ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ ç£ Ñ Ñ Ñ Ñ Ñ.
(5) Iron loss P W W/kg Ferromagnetic materials consume energy due to hysteresis and eddy current effects under dynamic magnetization conditions
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