In fact, there is no heavy steel in specifications and technical documents. In order to distinguish steel structures of light houses, it may be more appropriate to call general steel structures "ordinary steel". Due to the wide range of ordinary steel structures, which can include all kinds of steel structures, regardless of the load, and even many contents of light steel structures, the technical specification for steel structures of light buildings only stipulates some more specific contents according to its "light" characteristics, and the scope is limited to single-layer portal frames.

輕鋼也是一個比較含糊的名詞，一般可以有兩種理解。一種是現行《鋼結構設計規范》中“圓鋼、小角鋼的輕型鋼結構”，是指用圓鋼和小于L45＊4和L56＊36＊4的角鋼制作的輕型鋼結構，主要在鋼材缺乏年代時用于不宜用鋼筋混凝土結構制造的小型結構，現已基本上不大采用，所以這次鋼結構設計規范修訂中已基本上傾向往掉。另一種是《門式剛架輕型房屋鋼結構技術規程》所規定的具有輕型屋蓋和輕型外墻（也可以有條件地采用砌體外墻）的單層實腹門式剛架結構，這里的輕型主要是指圍護是用輕質材料。既然前一種已經快取消，所以現在的輕鋼含義主要是指后一種。

Light steel is also a vague term, which can be understood in two ways. One is the "light steel structure of round steel and small angle steel" in the current code for design of steel structures, which refers to the light steel structure made of round steel and angle steel smaller than L45 * 4 and L56 * 36 * 4. It is mainly used for small structures that are not suitable to be made of reinforced concrete structure in the era of lack of steel, which is basically not used now, Therefore, the revision of steel structure design code has basically tended to go away. The other is the single-layer solid web portal frame structure with light roof and light external wall (masonry external wall can also be used conditionally) specified in the technical code for steel structure of portal frame light house. The light here mainly refers to the light material used for enclosure. Since the former has been cancelled, the meaning of light steel now mainly refers to the latter.

輕鋼結構是一種年輕而極具生命力的鋼結構體系，已廣泛應用于一般工農業、貿易、服務性建筑，如辦公樓、別墅、倉庫、運動場館、娛樂、旅游建筑和低、多層住宅建筑等領域，還可用于舊房增層、改造、加固和建材缺乏地區、運輸不便地區、工期緊、活動式可拆遷建筑等，倍受業主青睞，主要有以下特點：

Light steel structure is a young and vital steel structure system. It has been widely used in general industrial, agricultural, trade and service buildings, such as office buildings, villas, warehouses, sports venues, entertainment, tourism buildings and low and multi-storey residential buildings. It can also be used for storey addition, transformation, reinforcement of old houses, areas with lack of building materials, areas with inconvenient transportation, tight construction period Movable removable buildings are favored by the owners, mainly with the following characteristics:

）采用輕型薄壁型材，自重輕、強度高、占用面積小。

）High efficiency light-weight thin-wall profile is adopted, with light weight, high strength and small occupied area.

）構配件均為自動化、連續化、高精度生產，產品規格系列化、定型化、配套化。各部分尺寸精確。

）The components and parts are produced automatically, continuously and with high precision, and the product specifications are serialized, finalized and matched. The dimensions of each part are accurate.

）結構設計、詳圖設計、計算機模擬安裝、工廠制造、工地安裝等以較小時間差同步進行。

）Structural design, detail design, computer simulation installation, factory manufacturing, site installation, etc. shall be carried out synchronously with a small time difference.

）基礎以上干式工法沒有濕作業，內裝飾等易于一次到位。型材經過鍍鋅、涂層后外觀優美且防腐，有利于減少圍護和裝修用度。

）The dry construction method above the foundation has no wet operation, and the interior decoration is easy to be in place at one time. After galvanizing and coating, the profile has beautiful appearance and anti-corrosion, which is conducive to reducing the cost of enclosure and decoration.

）便于擴大柱距和提供更大分隔空間，可降低層高和增加建筑面積（住宅實用面積可達92%）。在增層、改造、加固方面上風明顯。

）It is convenient to expand the column spacing and provide greater separation space, reduce the storey height and increase the building area (the practical area of residence can reach 92%). It has obvious advantages in storey addition, transformation and reinforcement.

）新墻材應用范圍廣，大量使用采光帶，透風條件好。

）The new wall materials have a wide range of applications, a large number of daylighting belts are used, and the ventilation conditions are good.

）室內水熱電氣管線全部隱蔽在墻體中和樓層間，布置靈活，修改方便。

）All indoor hydrothermal electrical pipelines are concealed in the wall and between floors, with flexible layout and convenient modification.

）屋子可以搬遷、材料可全部回收利用，不會造成垃圾，符合可持續發展戰略。

）The house can be moved and all materials can be recycled without causing waste, which is in line with the sustainable development strategy.