Q1-Is stainless steel really rust-free?

It will rust, but not easily! Corrosion may occur in the following situations:

1. Chloride ions (such as seawater, salt spray) → Choose 316/2205.

2. High temperature oxidation (>800℃) → Choose 310S heat-resistant steel.

3. Surface scratches destroy the passivation film → Clean and maintain regularly.

Q2-Which is better, 304 or 316?

Q3-How to distinguish true and false stainless steel?

1. Magnet test: Austenite (304/316) is non-magnetic (but may be weakly magnetic after cold processing).

2. Liquid test: drop 304 reagent, if it turns red, it is true, if it turns yellow, it is false (not enough nickel).

3. Spectrometer: Accurately analyze the composition (regular manufacturers provide material reports).