Chemical pump austenitic stainless steel heat treatment

by:J&T     2020-06-25
Chemical pump is chemical industry chemical wastewater, chemical raw materials, corrosion medium pump, chemical pump material has anti-corrosion lining plastic pump, metal pump, such as stainless steel water pump belongs to the metal water pump type, austenitic stainless steel, austenitic, as the name implies its organization for austenitic stainless steel heat treatment is very important, because of the important tasks of austenitic stainless steel is resistant to corrosion, improper heat treatment, its corrosion resistance will be discounted, this article mainly told austenitic stainless steel heat treatment. Austenitic stainless steel, is a common stainless steel ( 18 - 8 steel) , such as a lot of dishes in the kitchen are made of austenitic stainless steel. Austenitic stainless steel, just as its name implies its organization is austenite, it has no magnetic, no hardenability. Austenitic stainless steel corrosion resistance in oxidizing environment is very strong, the so-called oxidation environment can be as simple as oxygen environment, austenitic stainless steel good toughness, easy to processing molding, thus USES a very wide range. Austenitic stainless steel is mainly used for corrosion resistance, heat treatment had a great influence on it. Austenitic stainless steel corrosion resistance and acid resistance mainly depends on the surface passivation, if the surface passivation could not sustain this behavior, corrosion, it will happen. Therefore, austenitic stainless steel is not completely stainless, it is just for oxidation and acid environment. For special ion, does not have a strong ability to resist. Austenitic stainless steel heat treatment mainly affects surface passivation ability, thus affect its corrosion resistance. Uniform corrosion is a common corrosion phenomenon, uniform corrosion depends on the distribution uniformity of chromium. Heat treatment effect on chromium element distribution, natural affect uniform corrosion resistance properties of austenitic stainless steel. Intergranular corrosion is evaluation of one of the important corrosion of austenitic stainless steel. In general, if the austenitic stainless steel sensitization, carbide in grain boundary precipitates a large amount of beads, the intergranular corrosion performance will be discounted. Austenitic stainless steel in the event of sensitization, even in common electrochemical environment will happen serious intergranular corrosion. Austenitic stainless steel pitting austenitic stainless steel at room temperature to high temperature state without solid state phase transition point, the main aim of the heat treatment is to make the machining process of carbides dissolve into the matrix, so that the alloy elements distribution more uniform. Add austenitic stainless steel is heated to high temperatures, the carbides dissolve into the matrix, and then quickly cooled to room temperature, the process, the austenite stainless steel hardening, because there is no phase change, room temperature remained austenite state, a process known as solid solution treatment. Solid solution treatment, only for the purpose of rapid cooling carbon and alloy elements distribution more uniform. Austenitic stainless steel in solid solution treatment, if the cooling speed too slow, as the temperature drops, the carbon atoms in the substrate solubility decreased, carbide precipitation. Especially easy to combine with chromium and carbon atoms, forming M23C6 carbides, distribution on the grain boundaries, grain boundary chromium depleted occur, sensitization. Austenitic stainless steel occurred after sensitization, should be in 850 & ordm; Heat the C above, carbide solution and rapid cooling can solve the problem of sensitization. Stress corrosion cracking of austenitic stainless steel is a common failure modes. You need to pay attention to, main factors to stress corrosion cracking depends on two aspects: first, there must be a stress, it could be applied stress, also may be residual stress; Second, the stress corrosion cracking sensitivity ions, such as halogen element ions, especially is common in the chloride ion. Application of austenitic stainless steel, not often use its ability to withstand stress, residual stress, so should pay special attention to because in environment containing chlorine ion, residual stress can cause the stress corrosion cracking. To the method of residual stress is the stress relieving. Austenitic stainless steel stress corrosion cracking pitting corrosion is terrible. Says it is a terrible corrosion, the use of the ancients said: a word to describe the problem of fitting & other; Devil, details & throughout; 。 Pitting there are two main reasons: first, is the material composition is uneven, such as sensitization, austenitic stainless steel is particularly prone to pitting; Secondly, uneven environment concentration of corrosive medium, it is also the cause of pitting corrosion. In case of pitting, local passivation film is destroyed, so will be in a state between active and passive two competition, once can't happen passivation, pitting will proceed constantly, until component punch.
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