Q:What is the definition of cold rolled galvanized?
A:Cold-rolled galvanized steel uses cold-rolled steel plate as the substrate. A layer of zinc coating is formed on the surface of the steel plate through hot-dip galvanizing or electro-galvanizing process, thus combining the high strength and high precision of cold-rolled plate with the corrosion resistance of zinc layer.
Q:What are the core characteristics of cold-rolled galvanized steel?
A:Corrosion resistance: The zinc coating acts as a sacrificial anode to protect the substrate from oxidation corrosion and extend its service life.
Surface quality: The surface of the cold-rolled substrate is smooth and flat. After galvanizing, it can be further treated (such as phosphating and painting), which is beautiful and suitable for subsequent processing.
Mechanical properties: The cold rolling process gives the material higher strength and hardness, and the zinc coating does not affect the formability and weldability of the substrate.
Q:What are the typical application scenarios?
A:Automobile manufacturing: body panels, chassis parts (mainly hot-dip galvanizing, resistant to stone impact corrosion).
Home appliance industry: refrigerator shell, air conditioning panel (mainly electro-galvanizing, beautiful surface and easy to paint).
Construction field: roof steel plate, light steel keel (mainly hot-dip galvanizing, strong weather resistance).
Hardware products: furniture accessories, pipe accessories (mainly electro-galvanizing, low cost).
Q:What are the advantages of cold-rolled galvanized steel sheets compared to cold-rolled steel sheets?
A:Excellent corrosion resistance (zinc layer protection)
High surface accuracy (cold-rolled substrate flatness)
Strength Medium to high strength (cold-rolled hardening)
Cost High (galvanizing process cost)
Q:What are the precautions for cold-rolled galvanized steel?
A:1. Storage and transportation: Avoid humid environment to prevent zinc layer from oxidizing and generating "white rust". Moisture-proof packaging or oiling can be used for protection.
2. Processing: When welding, the current and speed must be controlled to avoid evaporation of the zinc layer and the formation of pores; when stamping, pay attention to mold lubrication to prevent the zinc layer from falling off.
3. Environmental protection requirements: Some galvanizing processes (such as chromium-containing passivation) must comply with environmental protection regulations. Currently, chromium-free passivation technology is gradually being promoted.