1、钢结构耐热不耐火

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

当温度在150℃以下时，钢材性质变化很小。因而钢结构适用于热车间，但结构表面受150℃左右的热辐射时，要采用隔热板加以保护。温度在300℃ -400℃时.钢材强度和弹性模量均下降，温度在600℃左右时，钢材的强度趋于零。在有特殊防火需求的建筑中，钢结构必须采用耐火材料加以保护以提高耐火等级。

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、钢结构耐腐蚀性差

2. Poor corrosion resistance of steel structure

特别是在潮湿和腐蚀性介质的环境中，容易锈蚀。一般钢结构要除锈、镀锌或涂料，且要定期维护。对处于海水中的海洋平台结构，需采用“锌块阳极保护”等特殊措施予以防腐蚀。

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、材料强度高，自身重量轻

3. High material strength and lightweight

钢结构使用的钢材强度较高，弹性模量也高。与混凝土和木材相比，其密度与屈服强度的比值相对较低，因而在同样受力条件下钢结构的构件截面小，自重轻，便于运输和安装，适于跨度大，高度高，承载重的结构。

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、钢材韧性，塑性好，材质均匀，结构可靠性高

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

适于承受冲击和动力荷载，具有良好的抗震性能。钢材内部组织结构均匀，近于各向同性匀质体。钢结构的实际工作性能比较符合计算理论。所以钢结构可靠性高。

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、钢结构制造安装机械化程度高

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

钢结构构件便于在工厂制造、工地拼装。工厂机械化制造钢结构构件成品精度高、生产效率高、工地拼装速度快、工期短。钢结构是工业化程度的一种结构。

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、钢结构密封性能好

6. Good sealing performance of steel structure

由于焊接结构可以做到完全密封，可以作成气密性，水密性均很好的高压容器，大型油池，压力管道等。

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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