How to distinguish the authenticity of 304 stainless steel?

1. Observe the appearance markings
1. Steel seal certification
Genuine products must have a clear steel seal marking. SUS304?” If variants such as "DUS304" or "SVS304" appear, they are all counterfeits. Laser-engraved marks are invalid; only pressed steel stamps are reliable.
2. Surface texture
The surface of genuine 304 is smooth and uniform, without sand holes or scratches. Inferior products are often rough, grayish or have yellow spots.
Ii. Simple Physics Test
1. Magnetic detection
304 has an austenitic structure. Weakly magnetic or non-magnetic? If the magnet strongly adheres, it is not genuine (for example, fake 304 contains more ferrite). Note: It may be weakly magnetic after processing and needs to be verified in combination with other methods.
2. Weight comparison
Under the same size, genuine 304 has a higher density (7.93g/cm³). If it is too light, it may be a manganese-containing counterfeit.
Iii. Chemical Reagent Verification
1. Specialized detection solution
After dropping the reagent:
"True 304:?" Does it not change color within 3 minutes? (A slightly deeper bottom is acceptable.
Counterfeit: Turns red/yellow within 10 seconds to 3 minutes (excessive manganese).
Note: The results of the reagent should be combined with other methods, and there may be errors in a single test.
Iv. Guide to Avoiding Pitfalls
Beware of low-price traps
The price of 304 raw material is about twice that of counterfeit products (such as 201 stainless steel), and products priced over a thousand yuan are more reliable.
2. Reject ambiguous labels
If there is no steel stamp, the label is blurry or only says "Food grade", it is questionable. You must recognize "SUS304".
3. Prioritize brand channels
Well-known brands provide material inspection reports to avoid street vendors or unqualified online stores.
Summary
True 304 stainless steel must simultaneously meet the following requirements? Standard steel stamp + weak magnetism + detection solution does not change color? . When making daily purchases, it is recommended to bring a magnet and a small bottle of detection solution (with an average online price of 5 yuan). On-site double verification can effectively avoid 90% of counterfeit goods. If used for food containers, it is necessary to confirm that it complies with the GB 4806.9 standard.

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