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Heat treatment method for inspecting TP347HFG

A heat treatment method and electrolytic corrosion technology, which is applied in the field of heat treatment of TP347HFG, can solve the problems of low test accuracy, unclear structure and appearance of TP347H, and failure to achieve 100% test, and achieve strong significance and obvious features Effect

Pending Publication Date: 2020-07-14
重庆赛宝工业技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is very difficult to distinguish TP347H and TP347HFG by traditional corrosion methods, and some existing identification methods, such as 200910308566. It cannot be distinguished well, resulting in low inspection accuracy and unable to achieve the purpose of 100% inspection

Method used

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  • Heat treatment method for inspecting TP347HFG
  • Heat treatment method for inspecting TP347HFG
  • Heat treatment method for inspecting TP347HFG

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Place the sample in heat treatment equipment at a temperature of 850°C and keep it warm for 60 minutes. After the heat preservation procedure is over, take out the sample and place it in the air to cool;

[0033] Grind and polish the sample after heat treatment with sandpaper from coarse to fine to obtain a metallographic polished surface, then use the stainless steel plate as the cathode, and the sample as the anode, and the metallographic polished surface is opposite to the stainless steel plate cathode The way of standing still in the sulfuric acid aqueous solution electrolyte with a volume percentage of 8%, the electrolysis specification: voltage 6V, time 10s; after the treatment is completed, take out the sample, rinse it with static water in turn, add absolute ethanol and dry it, and place it under an optical microscope Under the observation, the sample shows the network original deformed austenite grain morphology, which is TP347HFG.

Embodiment 2

[0035] Place the sample in heat treatment equipment at a temperature of 900°C and keep it warm for 60 minutes. After the heat preservation procedure is over, take out the sample and cool it in the air;

[0036] Grind and polish the sample after heat treatment with sandpaper from coarse to fine to obtain a metallographic polished surface, then use the stainless steel plate as the cathode, and the sample as the anode, and the metallographic polished surface is opposite to the stainless steel plate cathode The way of standing still in the sulfuric acid aqueous solution electrolyte with a volume percentage of 12%, the electrolysis specification: voltage 12V, time 35s; after the treatment is completed, the samples are taken out, rinsed with static water in turn, dried after adding absolute ethanol, and placed in an optical microscope Under the observation, the sample shows the network original deformed austenite grain morphology, which is TP347HFG.

Embodiment 3

[0038] Place the sample in heat treatment equipment at a temperature of 950°C and keep it warm for 60 minutes. After the heat preservation procedure is over, take out the sample and cool it in the air;

[0039] Grind and polish the sample after heat treatment with sandpaper from coarse to fine to obtain a metallographic polished surface, then use the stainless steel plate as the cathode, and the sample as the anode, and the metallographic polished surface is opposite to the stainless steel plate cathode The way of standing still in the sulfuric acid aqueous solution electrolyte with a volume percentage of 15%, the electrolysis specification: voltage 15V, time 60s; after the treatment is completed, the samples are taken out, rinsed with static water in turn, dried after adding absolute ethanol, and placed in an optical microscope Under the observation, the sample shows the network original deformed austenite grain morphology, which is TP347HFG.

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Abstract

The invention discloses a heat treatment method for inspecting TP347HFG, which comprises the following steps: carrying out heat treatment on a test sample, and carrying out electrolytic corrosion until the test sample shows that the mesh-shaped original deformed austenite crystal grain morphology is TP347HFG. Compared with the prior art, the method has the advantages that the morphology of the reticular original deformed austenite grains can be clearly displayed, the significance is strong, the characteristics are obvious, the TP347HFG and the TP347H can be accurately distinguished, and the accuracy can reach 100 percent.

Description

technical field [0001] The invention relates to an identification method for stainless steel materials, in particular to a heat treatment method for testing TP347HFG. 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 of TP347H by adjusting the composition and adopting a new manufacturing and treatment process. As an austenitic heat-resistant steel, TP347HFG is widely used in the high-temperature heating surface of large-capacity, high-parameter super(super)critical boilers. Compared with TP347H, the chemical composition and mechanical prop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32G01N1/28G01N1/30G01N21/84G01B11/24
CPCG01N1/32G01N1/286G01N1/30G01N21/84G01B11/24G01N2001/2866
Inventor 江平李勇邓云峰覃政委谢奉杰
Owner 重庆赛宝工业技术研究院有限公司
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