我们在日常生活中其实很常见这种方管的，就目前使用方管的行业来说那真的是数不胜数，我举几个例子比如：建筑，机械制造，钢铁建设等项目， 造船，太阳能发电支架，钢结构工程，电力工程，电厂，农业和化学机械，玻璃幕墙，汽车底盘，机场,锅炉建造，高速路栏杆，房屋建筑，压力容器，石油储罐，桥梁，电站设备，起重运输机械及其他较高载荷的焊接结构件等。

In fact, we are very familiar with square pipes in our daily life. For the industry using square pipes at present, there are countless. Let me give a few examples: construction, machinery manufacturing, steel construction, shipbuilding, solar power generation support, steel structure engineering, electric power engineering, power plants, agricultural and chemical machinery, glass curtain wall, automobile chassis, airport, boiler construction, etc. Highway railings, buildings, pressure vessels, oil tanks, bridges, power plant equipment, lifting and transportation machinery and other welding structures with higher loads.