Performance of corrosion resistance of 304 stainless steel tube

Average corrosion: 304 stainless steel tubes have better corrosion resistance than 316L and 317L in most environments due to the chromium (22%), molybdenum (3%) and nitrogen (0.18%) content. 316 stainless steel tube local corrosion resistance: 304 stainless steel chromium, molybdenum and nitrogen content makes it in oxidation and acid solution, point erosion and gap erosion has a strong resistance. Stress corrosion resistance: the double-phase microstructure of 304 stainless steel tube helps improve the resistance of stainless steel to stress erosion cracking ability. In the presence of certain temperature, tension, oxygen and chloride, the austenitic stainless steel will occur chloride stress invasion 316 stainless steel tube because these premises are not easy to control, so the use of 304L, 316L and 317L is limited in this respect. Anti-erosion fatigue: 304 stainless steel has high anti-erosion fatigue strength due to its high strength and anti-erosion ability. Processing equipment is susceptible to erosion environment and loading cycle, 2205 characteristics are very suitable for such applications. Annealing atmosphere. 316 welded pipe is generally the use of pure hydrogen as annealing atmosphere, atmosphere purity is better than 99.99%, if another department in the atmosphere is inert gas, purity can also be a little lower, but absolutely cannot contain too much oxygen, water vapor. Whether the annealing temperature reaches the designated temperature.

316 stainless steel tube heat treatment is generally taken solid solution heat treatment, which is commonly known as "annealing", the temperature range is 1040~1120℃(Japanese scale). You can also observe through the observation hole of the annealing furnace that the stainless steel tube in the annealing area should be incandescent, but not softened and drooping.

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