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1.Steel toughness, good plasticity, uniform material, high reliability of structure, suitable for bearing shock and dynamic load, with good seismic performance. The internal structure of the steel is homogeneous and close to isotropic homogenate. The actual working performance of steel structure accords with the calculation theory. So the steel structure has high reliability.

2.High strength, light weight, high strength of steel, high modulus of elasticity. Compared with concrete and wood, the density and the ratio of yield strength is relatively low, so in the same stress under the condition of the steel structure component cross section is small, light weight, easy to transport and install, suitable for large span, high altitude, carrying heavy structure.

portal steel frame

3.The steel structure has good sealing performance, because the welding structure can be completely sealed, it can be used as air tightness,pressure vessel in good water tightness, large oil pool, pressure pipe and so on.

 4.Heat-resistant steel structure is not fireproof, when the temperature was below 150 ℃, the steel properties changed little. Thus the steel structure is suitable for the hot workshop, but the structure surface at the thermal radiation of about 150 ℃, to adopt heat insulation board to protect it. Temperature at 300 ℃ to 400 ℃. The steel strength and elastic modulus were significantly decreased, temperature left at 600 ℃, the strength of the steel tends to zero. In buildings with special fire protection requirements, the steel structure must be protected by refractory materials to improve the fire resistance rating.

5. Corrosion resistance of steel structure is not good, especially in humid and corrosive media environment, easy to rust. General steel structure should be resist rust, galvanized or paint, and should be maintained regularly. For Marine platform structure in seawater, special measures such as "zinc block anode protection" should be adopted to prevent corrosion.

6.Steel structure manufacturing installation mechanization degree is high, steel structure components are easy to manufacture in the factory and site assembly. The factory mechanized manufacture steel structure component finished product precision high, the production efficiency is high, the construction site assembly speed is quick, the construction period is short. Steel structure is the most industrialized structure.