Whether or heat-resistant steel, stainless steel screws for the comprehensive performance of austenite size of steel plate is best, have enough strength, and has excellent plasticity and hardness is not high also, this is also one of the reasons they are widely used. Austenitic stainless steel is similar to most other metal materials, and its tensile strength, yield strength and hardness are increased with the decrease of temperature. The plasticity decreases as the temperature decreases. Its tensile strength within 15 ~ 80 ° C temperature increase is relatively uniform. More importantly: the stainless steel screw decreases with the temperature, the impact toughness decreases slowly, there is no brittle transition temperature. Therefore, stainless steel can maintain sufficient plasticity and toughness at low temperature.