SA179 is a seamless cold-drawn low-carbon steel in the American Society for Testing and Materials (ASTM) standard, mainly used to manufacture heat transfer tubes for heat exchangers and condensers. This steel has excellent thermal conductivity and processing formability through strict smelting and cold-drawing processes, and is a key material for achieving efficient heat transfer in heat exchange equipment.
Features
The outstanding feature of SA179 steel is that it has good thermal conductivity, can quickly transfer heat between different media, and improve heat exchange efficiency. Its mechanical properties are moderate, with a yield strength of about 205MPa, a tensile strength between 310-440MPa, and an elongation of not less than 25%. It has a certain strength and plasticity, and can withstand slight pressure and temperature fluctuations generated during heat exchange. In addition, the steel has excellent cold forming performance, and can be made into thin-walled tubes through cold drawing process to reduce thermal resistance; it has good welding performance, which is convenient for the connection of tube bundles and tube sheets, and its corrosion resistance is stable in general medium environments.
Chemical composition
SA179 steel adopts low-carbon design, and the carbon content is controlled at 0.10-0.15% to ensure good plasticity and weldability, and avoid the risk of reduced thermal conductivity and welding cracks due to excessive carbon content. The manganese content is 0.25-0.50%, which plays a role in strengthening the matrix and deoxidation; the silicon content is ≤0.10%, which reduces the impact on thermal conductivity; the phosphorus and sulfur contents are ≤0.035% and 0.035% respectively, which reduces the adverse effects of impurities on steel performance and ensures thermal conductivity efficiency and material reliability.
Application scope
SA179 steel is mainly used to manufacture heat transfer tubes for various heat exchange equipment, such as power plant condensers, industrial heat exchangers, evaporators and condensers of refrigeration equipment, etc. In the power industry, it can be used for steam condenser tube bundles to achieve efficient heat exchange between steam and cooling water; in the chemical industry, it is suitable for manufacturing heat exchangers that handle liquid or gas media that are not highly corrosive; in HVAC systems, it is often used to make heat transfer tubes for condensers and evaporators. Its excellent thermal conductivity and processability make it a widely used basic material in the field of heat exchange.
