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Credibility ,Four, sulfuric acid test sulfuric acid immersion stainless steel pipes test can be 302 and 316 and 317 and 304 to distinguish. The cutting edge of the sample should be finely ground, then the volume concentration of 20~30%, temperature of 60~66 c c c (1.42) in the proportion of clean and passivation for half an hour. The volume concentration of sulfuric acid test solution was 10%, heated to 71 degrees when.302 and 304 stainless steel immersed in the hot solution, rapid corrosion and a large number of bubbles, sample within a few minutes of black; and 316 and 317 steel specimens is not subject to corrosion or reaction is very slow (bubble) sample in 10 to 15 minutes do not change color. It can make the test more accurate if the test specimen with known composition is used to make an approximate comparison.
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