In addition to considering the working medium, working temperature and external environment, the corrugated pipe material of the heating pipe network corrugated pipe should also consider the possibility of stress corrosion, the influence of water treatment agent and pipe cleaning agent on the material, and combine on this basis. Corrugated pipe material welding, molding and material performance and price ratio, select economical and practical bellows manufacturing materials.
     Under normal circumstances, the material selected for the bellows should meet the following conditions:
     1. High elastic limit, tensile strength and fatigue strength to ensure the normal operation of the bellows.
     2, good plasticity, easy to shape the bellows, and can obtain sufficient hardness and strength through the subsequent treatment process (cold work hardening, heat treatment, etc.).
     3, better corrosion resistance, to meet the working requirements of bellows in different environments.
     4, good welding performance, to meet the welding work requirements of the bellows in the production process.
     For the heat pipe network laid in the trench, when the pipeline where the compensator is located is low, the rainwater or accidental sewage will soak the bellows, and the materials with stronger corrosion resistance, such as iron-nickel alloy and high-nickel alloy, should be considered.