Galvanised steel is steel that has been galvanised and covered with a layer of zinc. Here are the benefits and disadvantages of galvanised steel:

Benefits:

1. Excellent corrosion resistance: the zinc layer can effectively protect the steel from corrosion in the atmosphere, water and soil, extending the service life of the steel.

2. strong oxidation resistance: zinc layer in the atmosphere to form a layer of dense oxide film, can resist the erosion of oxygen and moisture, slowing down the oxidation of steel.

3. Good abrasion resistance: The high hardness of the zinc layer improves the abrasion resistance of the steel and reduces surface damage and scratches.

4. beautiful and durable: galvanised steel surface presents a bright metallic colour, which has a good decorative effect, while the zinc coating is not easy to come off and has high durability.

5. Easy to process and weld: galvanised steel has good processing performance and welding performance, which is suitable for the manufacture and processing of various steel structures.

Bad points:

1. Higher energy consumption in galvanising process: the galvanising process consumes a lot of energy and has an impact on the environment.

2. The galvanised layer may be damaged: During use, the galvanised layer may be affected by mechanical scratches, chemical corrosion, etc., leading to breakage of the galvanised layer, which reduces the corrosion protection performance.

3. Possible zinc poisoning: Under certain special circumstances, e.g. high temperature conditions, the zinc layer may release harmful substances, leading to a risk of zinc poisoning.

Overall, galvanised steel has good corrosion protection and aesthetic properties and is suitable for a wide range of outdoor and durability demanding engineering and construction projects. However, care also needs to be taken to protect the integrity of the galvanised coating to ensure its corrosion resistance.