Steel Conection, developed by Tuanninh, is a free Android application that offers a wide range of features for steel design. It provides a comprehensive set of tools for weld connection, section property calculation, and bullet connection.

The program also includes steel details for truss, column, beam, and other steel structures. With this application, users can easily calculate the properties of different steel sections, including their weight, area, and moment of inertia. Additionally, they can design various types of connections, such as fillet welds, groove welds, and bolted connections.

The interface is user-friendly and easy to navigate, making it accessible for both professionals and students. Steel Conection is a must-have tool for anyone involved in steel design and engineering.