Heavy, difficult to transport and install, increases construction time and cost.

Easily rusts, requires anti-corrosion coating or galvanizing, long-term use may lead to corrosion and strength degradation.

High strength, but poor toughness, may crack under low temperature conditions.

Typically uses welding or flange connections, complex construction, time-consuming.

Lower initial material cost, but higher maintenance and replacement costs.

Requires regular inspection and re-coating or replacing corroded parts, high maintenance cost.

Recyclable, but high production energy consumption, anti-corrosion coatings may cause pollution (e.g., lead, oil paint).

Light weight (density is about 1/3 of steel), easier to carry and install, and reduces transportation and construction costs.

Naturally corrosion-resistant, suitable for humid and acidic environments, long service life.

Good strength and toughness, excellent impact resistance, not easy to crack.

It can be connected using lugging ring or threaded connections, offering flexible installation and fast construction.

Higher initial material cost, but lower overall installation and maintenance costs.

Almost maintenance-free, no need for regular anti-corrosion coating replacement, low long-term usage cost.

100% recyclable, low production energy consumption, meets green building standards.