(1) high electrical Overcast rate of approximately 5 carbon steels times. (2) coefficient of linear expansion than carbon steel, 40%, and as the temperature increases, the values ??in the linear expansion coefficient is also a corresponding increase. (3) low thermal conductivity, approximately 1/3 of carbon steel. Jilin mechanical properties of the alloy pipe, regardless of Jilin alloy tube or heat-resistant precision tubes, precision tubes of austenitic overall performance the best of both adequate strength and excellent ductility and hardness is not high, which is that they one of the reasons that are widely used. Austenitic stainless steel precision tubes with the vast majority of other metallic materials similar to the tensile strength, yield strength and hardness increase with decreasing temperature; plasticity as the temperature decreases. Its tensile strength within 15 ~ 80 ° C in the temperature increase is relatively uniform. More important is: As the temperature decreases, the impact toughness decreased slowly, there is no brittle transition temperature. Stainless steel precision tubes at low temperature to maintain sufficient ductility and toughness. Jilin alloy tube heat resistance of heat-resistant alloy tube performance is the high temperature, both antioxidant or gas medium resistance to corrosion performance that thermal stability, while at high temperatures there is sufficient strength that of heat intensity.