Square tube is a commonly used steel material with unique structure and characteristics, therefore it has different usage methods in different occasions.

1. 方管在建筑領域的使用：在建筑領域，方管通常被用于搭建鋼結構、支撐和框架等方面。例如，在大型建筑物中，方管常被用作柱子、梁和橫梁的支撐結構，以提供穩定的承重能力。此外，方管也可以用于搭建腳手架、建筑門窗框架等應用。

1. Use of square pipes in the construction field: In the construction field, square pipes are usually used to build steel structures, supports, and frames. For example, in large buildings, square tubes are often used as supporting structures for columns, beams, and beams to provide stable load-bearing capacity. In addition, square tubes can also be used for applications such as scaffolding and building door and window frames.

2. 方管在工業領域的使用：在工業領域，方管常用于制造機械設備、輸送系統等。例如，方管可以用來制作輸送帶支撐架、輸送管道等，用于物料傳輸和輸送。此外，方管還廣泛用于制造各種類型的機械設備，如機械手臂、輸送機、裝卸設備等。

2. Use of square tubes in the industrial field: In the industrial field, square tubes are commonly used for manufacturing mechanical equipment, conveying systems, etc. For example, square tubes can be used to make conveyor belt support frames, conveyor pipelines, etc., for material transmission and conveying. In addition, square tubes are widely used in the manufacturing of various types of mechanical equipment, such as robotic arms, conveyors, loading and unloading equipment, etc.

3. 方管在農業領域的使用：在農業領域，方管通常被用于搭建溫室大棚、畜牧養殖設施等。方管可以用于制作溫室大棚的骨架結構，提供穩定的支撐，并方便安裝和拆卸。此外，方管還可以用于制作畜牧養殖設施的圍欄、圈舍等。

3. Use of square tubes in agriculture: In agriculture, square tubes are usually used to build greenhouses, animal husbandry facilities, etc. Square tubes can be used to make the framework structure of greenhouse greenhouses, providing stable support and facilitating installation and disassembly. In addition, square tubes can also be used to make fences, pens, etc. for livestock breeding facilities.

4. 方管在家具和裝飾領域的使用：方管還可以用于制作家具和裝飾品，如桌椅、衣架、貨架、展示架等。方管具有較高的強度和穩定性，可以為家具提供堅固的支撐結構，并具有一定的設計美感。

4. Use of square tubes in the field of furniture and decoration: Square tubes can also be used to make furniture and decorations, such as tables and chairs, hangers, shelves, display racks, etc. Square tubes have high strength and stability, which can provide a sturdy support structure for furniture and have a certain design aesthetic.

總的來說，方管由于其結構穩定、強度高、易加工和廣泛的適用性，在建筑、工業、農業以及家具和裝飾等領域都有著重要的應用。不同類型的方管在不同場合根據需求的不同，可以選擇不同的材質、尺寸和厚度，以滿足特定的使用要求。

Overall, square tubes have important applications in fields such as architecture, industry, agriculture, furniture, and decoration due to their stable structure, high strength, ease of processing, and wide applicability. Different types of square tubes can be selected from different materials, sizes, and thicknesses according to different needs in different situations to meet specific usage requirements.