1、鋼結構耐熱不耐火

1. Steel structure is heat-resistant but not fire-resistant

當溫度在150℃以下時，鋼材性質變化很小。因而鋼結構適用于熱車間，但結構表面受150℃左右的熱輻射時，要采用隔熱板加以保護。溫度在300℃ -400℃時.鋼材強度和彈性模量均下降，溫度在600℃左右時，鋼材的強度趨于零。在有特殊防火需求的建筑中，鋼結構必須采用耐火材料加以保護以提高耐火等級。

When the temperature is below 150 ℃, the properties of the steel change very little. Therefore, steel structures are suitable for hot workshops, but when the surface of the structure is exposed to thermal radiation of around 150 ℃, insulation panels should be used for protection. When the temperature is between 300 ℃ and 400 ℃ The strength and elastic modulus of steel both decrease, and when the temperature is around 600 ℃, the strength of steel tends to zero. In buildings with special fire protection requirements, steel structures must be protected with refractory materials to improve their fire resistance rating.

2、鋼結構耐腐蝕性差

2. Poor corrosion resistance of steel structure

特別是在潮濕和腐蝕性介質的環境中，容易銹蝕。一般鋼結構要除銹、鍍鋅或涂料，且要定期維護。對處于海水中的海洋平臺結構，需采用“鋅塊陽極保護”等特殊措施予以防腐蝕。

Especially in humid and corrosive environments, it is prone to rusting. Generally, steel structures require rust removal, galvanizing, or coating, and regular maintenance. Special measures such as "zinc block anode protection" should be taken to prevent corrosion of offshore platform structures located in seawater.

3、材料強度高，自身重量輕

3. High material strength and lightweight

鋼結構使用的鋼材強度較高，彈性模量也高。與混凝土和木材相比，其密度與屈服強度的比值相對較低，因而在同樣受力條件下鋼結構的構件截面小，自重輕，便于運輸和安裝，適于跨度大，高度高，承載重的結構。

The steel used in steel structures has high strength and elastic modulus. Compared with concrete and wood, the ratio of density to yield strength is relatively low. Therefore, under the same stress conditions, steel structures have smaller cross-sections, lighter self weight, are easy to transport and install, and are suitable for structures with large spans, high heights, and heavy loads.

4、鋼材韌性，塑性好，材質均勻，結構可靠性高

4. Steel has good toughness, plasticity, uniform material, and high structural reliability

適于承受沖擊和動力荷載，具有良好的抗震性能。鋼材內部組織結構均勻，近于各向同性勻質體。鋼結構的實際工作性能比較符合計算理論。所以鋼結構可靠性高。

Suitable for withstanding impact and dynamic loads, with good seismic performance. The internal structure of steel is uniform, almost isotropic and homogeneous. The actual working performance of steel structures is in line with the calculation theory. So the reliability of steel structures is high.

5、鋼結構制造安裝機械化程度高

5. High degree of mechanization in steel structure manufacturing and installation

鋼結構構件便于在工廠制造、工地拼裝。工廠機械化制造鋼結構構件成品精度高、生產效率高、工地拼裝速度快、工期短。鋼結構是工業化程度的一種結構。

Steel structural components are easy to manufacture in factories and assemble on construction sites. Mechanized manufacturing of steel structural components in factories has high precision, high production efficiency, fast assembly speed on construction sites, and short construction period. Steel structure is a type of structure with a high degree of industrialization.

6、鋼結構密封性能好

6. Good sealing performance of steel structure

由于焊接結構可以做到完全密封，可以作成氣密性，水密性均很好的高壓容器，大型油池，壓力管道等。

Due to the welding structure, it can achieve complete sealing and create high-pressure vessels, large oil tanks, pressure pipelines, etc. with good air tightness and water tightness.

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