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How can we tell a 304 from a 316 grade material?

The fundamental difference between these two steel grades is that 316 grade has molybdenum and 304 doesn't. There are several products available in the market that are used for a quick detection of molybdenum content. A small area of the material is previously submitted to a quick sanding. Afterwards, 2 or 3 drops of reagent is added to the relevant surface. The drops are stirred with a plastic rod. After a few minutes the reagent changes color from yellow to brown if the material has molybdenum content. If it stays yellow, the material is not a 316 grader. It is important to know that those tests are not quantitative. The reagent also produces a brown color with molybdenum contents lower than 2%, which is the minimum content acceptable to consider a material a 316 grader.
 
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