304 stainless steel
304 stainless steel is one of the most commonly used austenitic stainless steels in the world. Known for its excellent corrosion resistance, formability, and durability, it is widely applied in kitchenware, chemical equipment, construction, and food processing industries. However, as market demand grows, so does the risk of counterfeit or mislabeled materials.
For buyers and engineers, knowing how to correctly identify genuine 304 stainless steel is essential to ensure product performance and safety. This article provides a comprehensive guide to distinguishing 304 from other grades using practical, reliable methods.
Check mill test certificates
The most reliable and professional way to verify 304 stainless steel is to review the Mill Test Certificate (MTC) provided by the supplier. A genuine MTC includes detailed chemical composition and mechanical properties, such as:
Nickel (Ni) content: 8.0–10.5%
Chromium (Cr) content: 18.0–20.0%
Tensile strength and yield strength
Always request the MTC from your supplier. Reputable trading companies, like ours, provide original mill certificates for every batch. If the supplier cannot produce a valid MTC, it is a major red flag.
Perform a Magnet Test (Quick Screening)
Many people mistakenly believe that all stainless steel is non-magnetic. In fact, 304 stainless steel is austenitic and, in its annealed state, is almost completely non-magnetic. However, after cold working (e.g., bending, stretching), it may develop weak magnetic properties.
Genuine 304: A magnet will show little to no attraction.
Other grades (e.g., 201, 430): A magnet will stick noticeably, especially for ferritic grades like 430.
But the magnet test is only a preliminary screening tool. It cannot replace chemical analysis, but it helps quickly rule out strongly magnetic counterfeit materials.
Chemical spot test
For on-site or workshop testing, stainless steel identification solution (also known as molybdenum spot test solution) is a practical and affordable tool. This chemical reagent reacts with molybdenum and nickel in stainless steel.
Steps:
- Clean a small, inconspicuous area of the material.
- Apply one drop of the test solution.
- Observe the color change after 10–60 seconds.
Results for 304 stainless steel:
- No color change or a light green color indicates genuine 304.
- Dark red, brown, or purple indicates lower grades like 201.
Observe Surface Quality and Workmanship
304 stainless steel has excellent ductility and welding performance. If a product shows weld corrosion, cracking after forming, or rapid surface rusting in humid environments, it is likely not genuine 304.
| Feature | Genuine 304 | Counterfeit (e.g., 201) |
| Surface color | Uniform silver-white, bright | Dull, bluish-gray, or uneven |
| Weld seams | Smooth and clean | Rough, with dark spots or rust |
| After bending | No cracking | Possible cracking or orange-peel effect |
Compare Price and Market Reference
Price is a practical indicator. As of current market conditions, the raw material cost of 304 stainless steel is significantly higher than that of 201 or 430 grades. If a supplier offers “304 stainless steel” at a price remarkably lower than the market average, be cautious.
Typical price range: Based on LME nickel prices and market demand, 304 is usually 15–30% more expensive than 201 grade.
Ask for pricing transparency: A legitimate trading company will explain price differences based on alloy composition (nickel, chromium, molybdenum).
Conclusion
Identifying genuine 304 stainless steel requires a combination of methods rather than relying on a single test. For professional buyers and end users, the most authoritative approach is to request a Mill Test Certificate from a trusted supplier.
As a professional stainless steel trading company, we always supply genuine 304 stainless steel with full mill certificates, competitive pricing, and strict quality control. For any inquiries or to request test reports, please contact our sales team. Choose reliability—choose genuine 304.
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Post time: Jun-03-2026
