Surface nanocrystallization manufacture method for improving oxidation resistance performance of heat resistant steel

Abstract

The invention provides a surface nanocrystallization manufacture method for improving the oxidation resistance performance of heat resistant steel. According to the surface nanocrystallization manufacture method, a spinning mechanical device is used for conducting circular rolling and grinding on the surface of a material, a rolling press head is made of hard alloy, grinding pressure is smaller than or equal to 20 MPa, effective grinding-rotating size ranges from 100 mm to fai 220 mm, the grinding time ranges from 30 minutes to 60 minutes, and the grinding-rotating speed is smaller than or equal to 65 rpm. The problem that by the adoption of an existing method, oxidation resistance performance is not ideal, a nanolayer easily drops from a base body, material oxidation is accelerated, environment is polluted and large-sized workpieces cannot be treated due to workpiece size influence is solved. The surface nanocrystallization manufacture method belongs to the field of performance improvement of the heat resistant steel.

Description

technical field

[0001] The invention relates to a surface nanometerization method, in particular to a method for improving the anti-oxidation performance of superheater and reheater steel pipes of super (super) critical boilers under high-temperature steam conditions. Background technique

[0002] At present, among the reasons for the failure of the high-temperature heating surface (superheater, reheater) tubes of ultra (super) critical units, the corrosion of the outer wall and the oxidation of water vapor on the inner wall occupy an important position, and they are also one of the essential causes of boiler explosion and leakage accidents. Austenitic heat-resistant steel is currently the material widely used in high-temperature heating surfaces (superheaters and reheaters) of super (super) critical units. Unplanned outages. Many properties of engineering metal materials, such as fatigue, corrosion and oxidation, are extremely sensitive to the surface structure and propert...

Examples

Embodiment 1

[0027] Provided is a preparation method for improving the oxidation resistance of heat-resistant steel by surface nanometerization:

[0028] refer to Image 6 , using a four-column spinning machine to transmit pressure through hydraulic oil. The material of the rolling indenter is GCr15, the sample to be processed is a high-chromium austenitic heat-resistant steel Super304H, the grinding pressure is 10MPa, the size of the grinding sample is 60*60mm, the grinding time is 30min, and the grinding speed is 2rpm.

[0029] Before the surface is mechanically ground, the cylinder body on the pressure plate 3 is first cleaned and inspected, and then installed on the pressure plate 3 . Set the process parameters such as the speed of the final shaft of the four-column spinning machine, conduct trial grinding on the sample, and determine that the grinding position is in the middle of the plate. The plate was ground from No. 200 to No. 3000 with sandpaper, and then polished to a mirror s...

Embodiment 2

[0036] Provided is a preparation method for improving the oxidation resistance of heat-resistant steel by surface nanometerization:

[0037] refer to Image 6 , using a four-column spinning machine to transmit pressure through hydraulic oil. The material of the rolling indenter is GCr15, the sample to be processed is a high-chromium austenitic heat-resistant steel Super304H, the grinding pressure is 8MPa, the size of the grinding sample is 60*60mm, the grinding time is 30min, and the grinding speed is 2rpm.

[0038]Before the surface is mechanically ground, the roller cylinder on the pressure plate 3 is first cleaned and inspected, and installed on the pressure plate 3. Set the process parameters such as the final shaft speed of the four-column spinning machine, conduct trial grinding on the sample, and make sure that the grinding position is in the middle of the plate. The plate is polished from No. 200 to No. 3000 with sandpaper, and then polished to a mirror surface. The ...

technical field

[0001] The invention relates to a surface nanometerization method, in particular to a method for improving the anti-oxidation performance of superheater and reheater steel pipes of super (super) critical boilers under high-temperature steam conditions. Background technique

[0002] At present, among the reasons for the failure of the high-temperature heating surface (superheater, reheater) tubes of ultra (super) critical units, the corrosion of the outer wall and the oxidation of water vapor on the inner wall occupy an important position, and they are also one of the essential causes of boiler explosion and leakage accidents. Austenitic heat-resistant steel is currently the material widely used in high-temperature heating surfaces (superheaters and reheaters) of super (super) critical units. Unplanned outages. Many properties of engineering metal materials, such as fatigue, corrosion and oxidation, are extremely sensitive to the surface structure and propert...

Examples

Embodiment 1

[0027] Provided is a preparation method for improving the oxidation resistance of heat-resistant steel by surface nanometerization:

[0028] refer to Image 6 , using a four-column spinning machine to transmit pressure through hydraulic oil. The material of the rolling indenter is GCr15, the sample to be processed is a high-chromium austenitic heat-resistant steel Super304H, the grinding pressure is 10MPa, the size of the grinding sample is 60*60mm, the grinding time is 30min, and the grinding speed is 2rpm.

[0029] Before the surface is mechanically ground, the cylinder body on the pressure plate 3 is first cleaned and inspected, and then installed on the pressure plate 3 . Set the process parameters such as the speed of the final shaft of the four-column spinning machine, conduct trial grinding on the sample, and determine that the grinding position is in the middle of the plate. The plate was ground from No. 200 to No. 3000 with sandpaper, and then polished to a mirror s...

Embodiment 2

[0036] Provided is a preparation method for improving the oxidation resistance of heat-resistant steel by surface nanometerization:

[0037] refer to Image 6 , using a four-column spinning machine to transmit pressure through hydraulic oil. The material of the rolling indenter is GCr15, the sample to be processed is a high-chromium austenitic heat-resistant steel Super304H, the grinding pressure is 8MPa, the size of the grinding sample is 60*60mm, the grinding time is 30min, and the grinding speed is 2rpm.

[0038]Before the surface is mechanically ground, the roller cylinder on the pressure plate 3 is first cleaned and inspected, and installed on the pressure plate 3. Set the process parameters such as the final shaft speed of the four-column spinning machine, conduct trial grinding on the sample, and make sure that the grinding position is in the middle of the plate. The plate is polished from No. 200 to No. 3000 with sandpaper, and then polished to a mirror surface. The ...

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