规定了适用于专用设备中两面镀锌空心型材的热浸镀锌涂层的质量、质量和测试要求；通过焊接预镀锌钢带生产；仅在外表面上，使用连续（在线）工艺。

Specifies requirements for the mass, quality and testing of hot-dip galvanized coatings applied to hollow sections galvanized on both surfaces in a specialized plant; produced by welding pre-galvanized steel strip; and on external surfaces only, using a continuous (in-line) process.