Stainless steel pipe sold in Japan 630 stainless steel stamping xm21 material usage: widely used in the automotive, aviation industry and other sectors, the use of a large quantity. Cold rolled steel deep drawing cold rolled steel is used for deep drawing of complex parts drawing quality carbon structural steel, low-carbon cold-rolled steel. Delivery Status: subject to heat treatment and smooth delivery. The surface condition of the steel strip should be roughened or shiny. Usage: widely in automobiles, tractors and other industrial applications. 3 Introduction The physical properties and other physical materials, as the physical properties including the following three aspects: the melting point, heat capacity, thermal conductivity and coefficient of linear expansion of the thermodynamic properties of the electromagnetic properties, resistivity, conductivity and magnetic permeability, etc., and the Young's Mechanical properties of the modulus of elasticity, rigidity coefficient. These properties are generally considered to be the inherent characteristics of stainless steel, but it can also be affected by factors such as temperature, degree of processing and the magnetic field strength and the like. Often compared to stainless steel and iron, low thermal conductivity, resistance, and linear expansion coefficient and permeability properties depending on the crystal structure of the stainless steel itself varies. Table 4-1 to Table 4-5 lists the martensitic stainless steels, ferritic stainless steels, austenitic stainless steel, the physical properties of precipitation hardening stainless steel and duplex stainless steel main grades. Such as density, melting point, specific heat capacity parameters, thermal conductivity, thermal expansion coefficient, electrical resistivity, magnetic permeability and the longitudinal elastic coefficient. Correlation between physical properties and temperature (1) the specific heat capacity with temperature change to change the heat capacity will be, but the temperature change in the process of a metal structure in the event of a phase change or precipitation, the heat capacity will be a significant change in ratio. (2) the thermal conductivity below 600 ℃, the thermal conductivity of stainless steel is substantially within 10 ~ 30W / (m · ℃) range, as the temperature of the thermal conductivity increased with increasing trend. At 100 ℃, the thermal conductivity of stainless steel from large to small order 1Cr17,00Cr12,2 Cr 25N, 0 Cr 18Ni11Ti, 0 Cr 18 Ni 9,0 Cr 17 Ni 12Mο2,2 Cr 25Ni20.500 ℃ when the thermal conductivity by a large to a small order of 1 Cr 13,1 Cr 17,2 Cr 25N, 0 Cr 17Ni12Mο2,0 Cr 18Ni9Ti and 2 Cr 25Ni20. Thermal conductivity of austenitic stainless steel is slightly lower than the other, compared with ordinary carbon steel, 100 ℃, the thermal conductivity of austenitic stainless steel is about its quarter. (3) linear expansion coefficient in the range of 100-900 ℃, linear expansion coefficient of various types of stainless steel grades of the basic 10ˉ6 ~ 130 * 10ˉ6 ℃ ˉ1, and with increasing temperature showed an increasing trend. For the precipitation hardening stainless steel, the size of the linear expansion coefficient to determine the aging treatment temperature. (4) resistivity 0 ~ 900 ℃, all kinds of stainless steel grades than the resistance of the size of the basic 70 * 10ˉ6 ~ 130 * 10ˉ6Ω · m, and with the increase of temperature tends to increase. When used as heating material, low resistivity material should be used. (5) the magnetic permeability of the magnetic permeability of the austenitic stainless steel is extremely small, it is also known as non-magnetic material. Organization with a stable austenitic steels, such as 0 Cr 20 Ni 10,0 Cr 25 Ni 20 and so on, even if its more than 80% of the large deformation process will not take magnetism. Further carbon, nitrogen, high manganese austenitic stainless steels such as 1Cr17Mn6NiSN, 1Cr18Mn8Ni5N series and high-manganese austenitic stainless steel, and a large reduction in the processing conditions can occur ε-phase transformation, thus keeping the non-magnetic. At temperatures above the Curie point, even the magnetic material will lose magnetism. However, some austenitic stainless steel such as 1Cr17Ni7,0Cr18Ni9, because of its organization as a metastable austenite structure, thus making a large reduction occurs when cold or low temperature processing martensitic transformation, magnetic and magneto itself conductivity will increase. (6) the elastic modulus at room temperature ferritic stainless steel longitudinal elastic modulus of 200kN / mm2, longitudinal elastic modulus of austenitic stainless steel is 193 kN / mm2, slightly lower than carbon steel. With increasing temperature decreases the longitudinal elastic modulus, Poisson's ratio increases, the transverse elastic modulus (stiffness) decreased significantly. Longitudinal elastic modulus and tissue hardening collection will have an impact. (7) the amount of density with high chromium ferritic stainless steel density, large high nickel content and high manganese content in austenitic stainless steel density, character spacing at high temperatures due to increased density becomes small. Physical properties at low temperatures (1) the size of the thermal conductivity of stainless steel in low temperature thermal conductivity slightly different, but in general is about room temperature thermal conductivity of 50x. As the magnetic flux at a low temperature (flux density) is increased to increase the thermal conductivity. (2) the specific heat capacity at very low temperatures, the specific heat capacity of stainless steel there are some differences. Heat suffer greatly affect the temperature, in the 4k specific heat capacity can be reduced to below room temperature 1/100 specific heat capacity. (3) thermal expansion for austenitic stainless steel, 80k or less in shrinkage (relative to 273K) size is slightly different. Nickel content has a certain influence on shrinkage. Stainless steel with domestic (import) stainless steel band: stainless steel coil, stainless steel springs, stainless steel stamping, stainless steel precision, stainless steel mirror, stainless steel cold-rolled, hot-rolled stainless steel, etched stainless steel, stainless steel stretch band, stainless steel polished, stainless steel flexible, stainless steel hardware, stainless steel medium hard, stainless steel high temperature zone. 2 classification cold rolled strip ① to "stainless steel / sheet" for the raw material, at room temperature by cold rolling mill rolling timber. Conventional thickness, width; ② ["cold-rolled strip / coil"] has a smooth surface, high flatness, dimensional accuracy and good mechanical properties, etc., products are mostly in rolls, can be processed into coated steel; ③ cold-rolled stainless steel strip / roll production process: ⒈ pickling → ⒉ normal lubrication of rolling → ⒊ process → ⒋ annealing → ⒌ flat → ⒍ fine cut → ⒎ packaging → ⒏ reach customers. Hot-rolled hot rolled mechanism ① thickness 1.80mm-6.00mm, width 50mm-1200mm strip. ② [hot rolled strip / sheet] with low hardness, easily processed, and good ductility. ③ hot-rolled stainless steel strip / coil production process: ⒈ pickling → ⒉ high temperature lubrication of rolling → ⒊ process → ⒋ annealing → ⒌ flat → ⒍ fine cut → ⒎ packaging → ⒏ reach customers.