Method for detecting TP347HFG
A voltage and electrolyte technology, applied in the field of stainless steel material identification, can solve the problems of low lasting strength, creep limit and high temperature oxidation resistance, difficult to distinguish TP347H, unable to meet the high temperature performance requirements of ultra-supercritical boilers, etc. Safe and convenient operation, low cost effect
Active Publication Date: 2011-02-02
DONGFANG ELECTRIC CORP LTD
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However, after TP347H is formed by cold rolling, finer austenite grains can also be obtained if a lower solution treatment temperature is used, such as figure 1 As shown, the microstructure and grain size of the figure 2 The typical structures of TP347HFG shown are basically the same, and it is very difficult to distinguish TP347H and TP347HFG by conventional corrosion methods
Although the typical structures of the two are basically the same, TP347H has low durability strength, creep limit and high temperature oxidation resistance, which are far from meeting the high temperature performance requirements of ultra-supercritical boilers. Therefore, the detection problem of true and false fine-grained TP347HFG is in It is of great significance in the daily inspection of raw materials
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[0017] A specific embodiment of the present invention, a method for detecting TP347HFG, comprises the following steps:
[0018] Immerse the ground and polished sample in the electrolyte with adjusted etching voltage, choose oxalic acid aqueous solution as the electrolyte, immerse the ground and polished TP347HFG sample in the electrolyte with adjusted etching voltage, and carry out electrolytic corrosion.
[0019] The electrolyte composition is: oxalic acid aqueous solution 5-20%, specifically: oxalic acid (analytical pure) 6-12g, distilled water 70-100ml, electrolysis specification: voltage 8-20V, time 10-40S, cathode is stainless steel plate, anode is test In the same way, the polished surface of the sample is aligned with the cathode, with a distance of 5-15 mm. During the electrolytic etching process, the distance between the polished surface and the cathode should be kept constant, so that the corrosion oxide film is deposited on the surface of the sample. By controlling ...
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The invention discloses a method for detecting TP347HFG, comprising the following steps: a sample which is ground and polished is immersed in electrolyte with regulated etched voltage; the electrolyte comprises the component: 5-20 percent of oxalic acid water solution; the electrolysis standards as follows: voltage is 8-20V, the time is 10-40S, the cathode is a stainless steel plate; the polishedsurface of the sample aligns to the cathode, the distance is 5-15mm, the distance of the polished surface and the cathode is not changed in the process of electrolytic etching so as to lead a corroded oxidizing film to be deposited on the surface of the sample, the sample displays the shape of original deformed austenite crystal grain, and the sample is TP347HFG. The method can detect the TP347HFG accurately and reliably, and has safe and convenient operation, low cost and no pollution.
Description
technical field [0001] The invention relates to an identification method for stainless steel materials, in particular to a method for detecting TP347HFG used in large-capacity, high-parameter super (super)critical boilers. Background technique [0002] With the continuous development of domestic power plant boilers, super (super) critical boilers with large capacity and high parameters have emerged as the times require. The steam temperature and pressure of the boilers have been greatly improved. New austenitic stainless steel is widely used in the high temperature section of the heating surface. Tube, TP347HFG is one of them. It is a new type of chromium-nickel-niobium austenitic stainless steel tube made by adjusting the composition configuration on the basis of TP347H and adopting new manufacturing and treatment techniques. [0003] At present, there are not many manufacturers of TP347HFG stainless steel pipes in the world, mainly Sumitomo and DMV, etc., and their produc...
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IPC IPC(8): G01N1/32G01N21/84
Inventor 曾辉张学星
Owner DONGFANG ELECTRIC CORP LTD