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Technological method for improving high temperature creep resistant property of heat-resistant 403Nb blade steel

A process method and high-temperature creep technology, applied in the field of metallurgical materials, can solve the problems of no steel type, weakened dislocation and sub-grain pinning effects, etc., and achieve good strong-plastic coordination, improved high-temperature mechanical properties, and high resistance to high-temperature creep. The effect of changing performance

Active Publication Date: 2016-07-06
NORTHEASTERN UNIV
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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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  • Technological method for improving high temperature creep resistant property of heat-resistant 403Nb blade steel
  • Technological method for improving high temperature creep resistant property of heat-resistant 403Nb blade steel
  • Technological method for improving high temperature creep resistant property of heat-resistant 403Nb blade steel

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Experimental program
Comparison scheme
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

The invention provides a technological method for improving the high temperature creep resistant property of heat-resistant 403Nb blade steel, and belongs to the technical field of metallurgy materials. The method comprises the following steps that 1, the heat-resistant 403Nb blade steel is subjected to temperature homogenization according to two-stage heating; 2, primary thermal deformation treatment is conducted; 3, secondary thermal deformation treatment is conducted; 4, tempering treatment is conducted. According to the technological method for improving the high temperature creep resistant property of the heat-resistant 403Nb blade steel, on the basis that chemical components of existing heat-resistant 403Nb blade steel are not changed, a change of the structure state is achieved only through minor adjustment of the production technology, the purpose of improving the high-temperature mechanical property is achieved, and particularly, the high temperature creep resistant property is greatly improved; shapes of processing materials or finished products are not limited, no special requirement on applied forming methods exists, and the processing methods such as rolling, extruding and forging for bars, boards, pipes and the like can be implemented according to the technological method.

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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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
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