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A process method for improving high temperature creep performance of 403nb heat-resistant blade steel

A process method and high-temperature creep technology, applied in the field of metallurgical materials, can solve the problems of weakened dislocation and subgrain pinning, no steel type, etc., and achieve high-temperature mechanical properties improvement, good strong-plastic fit, and high-temperature creep resistance The effect of performance improvement

Inactive Publication Date: 2018-01-02
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 403Nb heat-resistant blade steel belongs to martensitic heat-resistant steel, and there is no corresponding steel type in China
However, precipitates also aggregate and coarsen during the creep process, and the aggregation and coarsening of precipitates will significantly weaken the pinning effect on dislocations and subgrains

Method used

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  • A process method for improving high temperature creep performance of 403nb heat-resistant blade steel
  • A process method for improving high temperature creep performance of 403nb heat-resistant blade steel
  • A process method for improving high temperature creep performance of 403nb heat-resistant blade steel

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Effect test

Embodiment 1

[0050] The 403Nb heat-resistant blade steel ingot used in this embodiment is a bar with a diameter of 40 mm and a length of 100 mm.

[0051] A process for improving the high-temperature creep performance of 403Nb heat-resistant blade steel is carried out according to the following steps:

[0052] Step 1, two-stage heating for temperature homogenization:

[0053] (1) Cast 403Nb heat-resistant blade steel ingots, place them in a heating furnace, heat them to 800°C, and keep them warm for 2 hours;

[0054] (2) Cast 403Nb heat-resistant blade steel into an ingot, raise the temperature to 1200°C, and keep it warm for 5 minutes;

[0055] Step 2, preliminary thermal deformation treatment:

[0056] (1) Cast 403Nb heat-resistant blade steel ingots and place them in a rolling mill for preliminary thermal deformation: the deformation temperature is 1150°C, and the cumulative deformation rate is not less than 50%;

[0057] (2) air-cooling the 403Nb heat-resistant blade steel ingot to r...

Embodiment 2

[0066] The 403Nb heat-resistant blade steel ingot used in this embodiment is a bar with a diameter of 40 mm and a length of 100 mm.

[0067] A process for improving the high-temperature creep performance of 403Nb heat-resistant blade steel is carried out according to the following steps:

[0068] Step 1, two-stage heating for temperature homogenization:

[0069] (1) Cast 403Nb heat-resistant blade steel ingot, place it in a heating furnace, heat it to 900°C, and keep it warm for 1h;

[0070] (2) Cast 403Nb heat-resistant blade steel into an ingot, raise the temperature to 1150°C, and keep it warm for 5 minutes;

[0071] Step 2, preliminary thermal deformation treatment:

[0072] (1) Cast 403Nb heat-resistant blade steel ingots and place them in a rolling mill for preliminary thermal deformation: the deformation temperature is 1050°C, and the cumulative deformation rate is not less than 50%;

[0073] (2) air-cooling the 403Nb heat-resistant blade steel ingot to room temperat...

Embodiment 3

[0080] The 403Nb heat-resistant blade steel ingot used in this embodiment is a bar with a diameter of 60 mm and a length of 80 mm.

[0081] A process for improving the high-temperature creep performance of 403Nb heat-resistant blade steel is carried out according to the following steps:

[0082] Step 1, two-stage heating for temperature homogenization:

[0083] (1) Cast 403Nb heat-resistant blade steel ingot, place it in a heating furnace, heat it to 850°C, and keep it warm for 1.5h;

[0084] (2) Cast 403Nb heat-resistant blade steel into an ingot, raise the temperature to 1200°C, and keep it warm for 8 minutes;

[0085] Step 2, preliminary thermal deformation treatment:

[0086] (1) Cast 403Nb heat-resistant blade steel ingots and place them in a rolling mill for preliminary thermal deformation: the deformation temperature is 1000°C, and the cumulative deformation rate is not less than 50%;

[0087] (2) air-cooling the 403Nb heat-resistant blade steel ingot to room tempera...

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Abstract

A process method for improving the high-temperature creep performance of 403Nb heat-resistant blade steel, belonging to the field of metallurgical materials technology; including the following steps: (1) heating the 403Nb heat-resistant blade steel in two stages for temperature uniformization; (2) preliminary thermal deformation Treatment; (3) Secondary thermal deformation treatment; (4) Tempering treatment. The method of the present invention does not change the chemical composition of the existing 403Nb heat-resistant blade steel, but only changes the organizational structure state through minor adjustments to the production process, thereby achieving the purpose of improving high-temperature mechanical properties, especially high-temperature resistance. The creep performance has been greatly improved; there are no restrictions on the shape of the processed materials or finished products, and there are no special requirements for the forming methods used. Bars, plates, pipes, etc., as well as rolling, extrusion, forging and other processing methods can all be processed according to This summary describes the implementation of the invention.

Description

technical field [0001] The invention belongs to the technical field of metallurgical materials, in particular to a process for improving the high-temperature creep performance of 403Nb heat-resistant blade steel. Background technique [0002] With the continuous development of thermal power units from subcritical to supercritical and ultra-supercritical, higher requirements are put forward for the performance of all heat-resistant materials used in steam generator sets, such as thick-walled boilers, steam pipes, steam turbine rotors, and steam turbine castings. , countries around the world are working hard to research and develop new high-performance heat-resistant steel. At present, the test standard for heat-resistant steel materials is that the strength of creeping 60000h at the service temperature can meet the requirements. However, the expected service life of the steam generator set is more than 200,000-300,000 hours. In order to ensure the safe and stable operation o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/06C21D6/00C22C38/02C22C38/04C22C38/48C22C38/44C22C38/46
CPCC21D6/004C21D6/005C21D6/008C21D8/065C21D2211/008C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48
Inventor 陈礼清曾周燏姚彦桃赵阳刘后龙李兴
Owner NORTHEASTERN UNIV LIAONING
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