316 stainless steel can be used as a food grade material if it meets certain standards, but "316" itself is not directly equivalent to "food grade" certification.
1. Material properties of 316 stainless steel
316 stainless steel (corresponding to the Chinese grade 0Cr17Ni12Mo2) adds 2% molybdenum (Mo) to 304 stainless steel, which significantly improves corrosion resistance, especially in environments containing chloride ions (such as salt water, disinfectants) or high temperatures. Its characteristics include:
Corrosion resistance: Better tolerance to acidic and alkaline foods (such as juice, vinegar) and high-temperature disinfection than 304 stainless steel.
Safety: The amount of heavy metals (lead, chromium, etc.) precipitated under normal use is extremely low, in line with international standards (such as the US FDA and EU food contact material regulations).
2. Key criteria for "food grade" certification
The "316" brand alone cannot be directly identified as food grade. It must meet the following conditions at the same time:
Comply with national standards: For example, according to China's "GB 4806.9-2016", it must pass dual tests for corrosion resistance and heavy metal migration.
Production control: Some industrial 316 stainless steel may contain excessive heavy metal impurities. It is necessary to identify products that are clearly marked with "food grade" or related certification marks.
3. Practical application suggestions
Preferred scenarios: high-salt, high-acid environments (such as seawater food processing, infant tableware) or utensils that require frequent high-temperature disinfection (such as bottle accessories).
Purchase notes: Check whether the product is marked with the words "food contact" to avoid unmarked or low-priced and inferior products.
Summary: 316 stainless steel is suitable for food contact in terms of material performance, but its safety needs to be judged in combination with specific product certification. If the budget allows and the use environment is harsh, 316 is a better choice; 304 is also sufficient for daily ordinary use (such as tableware).
Is 316 stainless steel food grade?
