When we buy thermos cups and stainless steel tableware, we will see numbers such as 304 and 316. These numbers actually represent the material made of the inner tank. The common one is 304 stainless steel, which is suitable for food and medical appliances. What does 304 on the cup mean?
This is the material model of the inner tank of the water cup. It refers to 304 stainless steel. The full name is austenitic stainless steel. 304 stainless steel is a nationally recognized food grade stainless steel, which is generally more common in stainless steel tableware. 304 stainless steel is a grade of stainless steel produced in accordance with the American ASTM standard. Because of its good corrosion resistance and heat resistance, 304 stainless steel is widely used in daily necessities such as tableware and drinking glasses.
In order to maintain the inherent corrosion resistance of stainless steel, steel must contain more than 18% chromium and more than 8% nickel. So most cups are marked as 304, but there are also illegal merchants who deceive consumers.
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