6. What are the main types of hot-dip galvanizing methods currently available? What are the commonly used techniques for hot-dip galvanizing steel pipes?

The main hot-dip galvanizing methods currently include the "wet process" (molten solvent method), "dry process" (solvent drying method), "lead-zinc method", and "protective gas reduction method". The "wet process" was initially used for steel pipe hot-dip galvanizing, but due to quality issues, the "dry process" gradually became the preferred method. Today, the "dry process" is predominantly used worldwide for steel pipe hot-dip galvanizing.