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Comparison between galvanized sheet and stainless steel

Galvanized sheet is ordinary steel sheet coated with a layer of zinc to prevent rust, with the core being "steel sheet + zinc layer"; stainless steel contains chromium (≥10.5%) and other alloy elements, forming a passive film to prevent rust by itself, essentially being "alloy steel."

2025-09-02

Galvanized steel is ordinary steel sheet coated with a layer of zinc to prevent rust; its core is "steel sheet + zinc layer." Stainless steel contains alloy elements such as chromium (≥10.5%) and prevents rust by forming a passive film on its own; essentially, it is "alloy steel."

Comparison Dimensions	Galvanized Steel	Stainless Steel
Rust Prevention Principle	The zinc layer sacrifices itself to protect the steel sheet (sacrificial anode protection); once the zinc layer is damaged, the underlying steel sheet rusts easily.	Chromium forms a stable passive film (chromium oxide) on the surface, which can self-repair if damaged.
Corrosion Resistance	Moderate, only resistant to atmospheric and mild humid environments; fails after zinc layer wears off.	Excellent, resistant to acids, alkalis, salt spray, and other harsh environments (e.g., 304 stainless steel resists everyday corrosion, 316 resists seawater).
Appearance	Bright silver or light gray with zinc crystallization on the surface (can be decorative); tends to darken over long-term use.	Matte silver-white or glossy finish with a finer, more premium texture; maintains metallic luster over time.
Cost	Lower, about 1/3 to 1/2 the cost of ordinary stainless steel.	Higher, alloy elements (chromium, nickel) increase cost.
Workability	Good, can be bent and stamped, but welding requires special treatment (to avoid zinc evaporation).	Moderate, harder than galvanized steel; high-strength grades (e.g., 430) are somewhat more difficult to process.
Applicable Scenarios	Low-cost rust prevention needs: billboards, ventilation ducts, appliance housings (non-core parts), guardrails.	High corrosion resistance / high-quality requirements: kitchenware (pots, sinks), medical instruments, outdoor sculptures, seaside facilities.