ERW (Electric Resistance Welded) steel pipes are widely used in construction, water systems, scaffolding, and structural projects. One of the key reasons for their popularity is that ERW steel pipes are highly suitable for galvanizing, especially hot-dip galvanizing.

Stainless steel welded pipes are ubiquitous in petrochemical pipelines, cleanroom pipelines in food factories, and water supply systems in buildings. They have swept the market with their significantly lower price and high production capacity compared to seamless pipes, but the presence of weld seams has also sparked controversy regarding their reliability.

Galvanized H-beams are corrosion-resistant steel products obtained by hot-dip galvanizing ordinary H-beams. Essentially, a uniform and dense zinc-iron alloy protective film is formed on the surface of the H-beam (a hot-rolled profile with an "H" shaped cross-section), solving the corrosion problem of ordinary steel in humid and corrosive environments.

Steel pipelines are a critical component of oil, gas, and water transportation. Protecting them from corrosion is essential to ensure long service life and safety. Two of the most widely used external pipe coatings are 3LPE (Three-Layer Polyethylene) and FBE (Fusion Bonded Epoxy).

Mild steel plate is made of ordinary carbon steel, which is low in cost, moderate in strength, and easy to process and weld, but its surface is prone to rust and requires subsequent painting or anti-corrosion treatment.

Cold-dip galvanized steel pipe is a type of welded steel pipe whose surface has undergone electro-galvanizing treatment. It is widely used in building structures, electrical conduits, furniture manufacturing, and mechanical supports, offering a certain degree of corrosion resistance and good processing performance. Compared to hot-dip galvanized steel pipe, cold-dip galvanized steel pipe has a thinner coating and a smoother appearance, making it suitable for indoor or non-corrosive environments. In recent years, with the continuous advancement of urban infrastructure construction and the improvement of industrial manufacturing standards, cold-dip galvanized steel pipe still maintains a certain market share in light steel structures, power cable trays, and scaffolding. However, due to its relatively weak weather resistance, it is prone to corrosion in humid or acidic/alkaline environments, and therefore is gradually being replaced by higher-grade anti-corrosion materials in some high-requirement projects.