CN102560245A - Microalloying and heat treatment method for 300MW turbonator rotor material - Google Patents
Microalloying and heat treatment method for 300MW turbonator rotor material Download PDFInfo
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- CN102560245A CN102560245A CN2011104548543A CN201110454854A CN102560245A CN 102560245 A CN102560245 A CN 102560245A CN 2011104548543 A CN2011104548543 A CN 2011104548543A CN 201110454854 A CN201110454854 A CN 201110454854A CN 102560245 A CN102560245 A CN 102560245A
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Abstract
The invention discloses a microalloying and heat treatment method for a 300MW turbonator rotor material. In the microalloying method for the 300MW turbonator rotor material, a microalloy element Nb is added into the chemical constitution of the turbonator rotor material; and the Nb content is 0.01 to 0.08 mass percent. In the heat treatment method for the 300MW turbonator rotor material, a workpiece is subjected to normalizing, quenching and tempering treatment; and proper process parameters are selected. According to the method, the strength and the toughness of the 300MW turbonator rotor material are obviously improved; the crystalline grains are refined; and the toughness is improved.
Description
Technical field
The present invention relates to a kind of 300MW rotor of steam turbo generator material microalloying and heat treating method, belong to metal material field.
Background technology
In actual production, 300MW rotor of steam turbo generator material runs into that the defective or FATT of ductile-brittle transition temperature (FATT) and intensity can not be taken into account and the situation that is difficult to reach technical requirements through regular meeting.Trace element niobium (Nb) is widely used in the micro-alloyed steel, and the performance of steel is produced multiple influence, mainly shows two aspects: the one, and in hot procedure, suppress austenitic deformation recrystallize and stop growing up of its crystal grain; The 2nd, can separate out carboritride through strain inducing, the precipitation strength effect of performance niobium.For 300MW generator amature material, add microalloy element Nb and can play significant effect the performance boost of steel.
Summary of the invention
In order to improve the mechanical property of 300MW rotor of steam turbo generator material, the present invention provides a kind of 300MW rotor of steam turbo generator material microalloying and heat treating method, is applicable to that the modifier treatment diameter is the rotor of steam turbo generator of 850 ~ 1200 mm.
For realizing the foregoing invention purpose, the present invention adopts the technical scheme that is described below:
A kind of 300MW rotor of steam turbo generator material microalloying is added with microalloy element Nb in the chemical constitution of its rotor of steam turbo generator material, the content of Nb is 0.01-0.08% (mass percent).
A kind of microalloying 300MW rotor of steam turbo generator material heat treatment method, its process step is:
(1) workpiece is put into well formula heat treatment furnace, be warming up to 350 ± 10 ℃ with the speed of 30 ~ 60 ℃/h, insulation 3 ~ 5h, and then be warming up to 600 ~ 700 ℃, insulation 4 ~ 8h with the speed of 30 ~ 60 ℃/h;
After (2) 600 ~ 700 ℃ of insulations, be warming up to 800 ~ 900 ℃ of quenching temperatures, insulation 16 ~ 30h with the speed of 50 ~ 100 ℃/h;
(3) workpiece is hung out from stove, precooling 3 ~ 10min in air immerses in the water and cools off 120 ~ 400min, from water, hangs out after being cooled to surface temperature≤100 ℃;
(4) cooling finishes back shove charge tempering in time, is warming up to 350 ± 10 ℃, insulation 5 ~ 15h with the speed of 30 ~ 60 ℃/h;
(5) after insulation finishes, be warming up to 550 ~ 680 ℃ of tempering temperatures, insulation 20 ~ 50h with the speed of 30 ~ 60 ℃/h;
(6) after tempering insulation finished, the speed with≤10 ~ 15 ℃/h in stove was chilled to≤air cooling of coming out of the stove after 200 ~ 150 ℃.
In temperature-rise period, note heat-up rate, in order to avoid cause rotor surface and heart portion excessive temperature differentials, cause stress excessive even crackle occurs.When temperature was lower than 600 ~ 700 ℃, heat-up rate was controlled at 30 ~ 60 ℃/h; When temperature was higher than 600 ~ 700 ℃, heat-up rate was controlled at 50 ~ 100 ℃/h.
Because the austenitic transformation process generally includes forming core, grows up, carbide dissolving, four processes of homogenization of composition.The holding stage in the austenitic area, rotor material interalloy elemental diffusion process need certain hour, but unsuitable long, calculate with 0.3 ~ 0.8h/100mm, in order to avoid austenite crystal is too grown up.
Proper heat treatment technology is to realize the key of power rotor performance, and when modified, quenching temperature should be controlled at 800 ~ 900 ℃, and tempering temperature should be controlled at 550 ~ 650 ℃, when guaranteeing the strength of materials, has good plasticity and toughness concurrently.
For the mechanical property that guarantees rotor and reduce workpiece hardening crack risk, select the type of cooling of precooling+water-cooled in the air.
Because adopt aforesaid technical scheme, the present invention has following positively effect:
One, with certain modified diameter 1100mm, the mechanical property before and after the 300MW rotor of steam turbo generator Nb microalloying of weight 45t after the thermal treatment is as shown in table 2.
Table 2 adds Nb front and back rotor heat treatment performance
| Performance | R eL/Mpa | R m/Mpa | A 5/% | Z/% | A KV/J(-18℃) | Grain fineness number |
| Add Nb | 730 | 845 | 21.4 | 62.5 | 120,134 | 7 |
| Do not add Nb | 625 | 740 | 25.0 | 64.5 | 77,74 | 5~6 |
Two, add the Nb microalloying after, intensity and toughness after the 300MW rotor of steam turbo generator material heat treatment obviously improve, crystal grain obtains refinement; This mainly is the refined crystalline strengthening effect of Nb, when improving intensity, improves toughness; Simultaneously, further improved intensity through precipitation strength.
Embodiment
Below in conjunction with embodiment technical scheme of the present invention is elaborated.
Be 25Cr2Ni4MoV with the material, be example, maximum diameter 1100 mm of this product, weight 55 t, 8.5 meters of length, operative norm: JB/T 7178-2002 through the 300MW rotor of steam turbo generator behind the microalloying.
This 300MW rotor of steam turbo generator; Its chemical ingredients is formed: C:0.19, Si:0.21, Mn:0.33, P:0.0074, S:0.006, Ni:3.78, Cr:1.75, Cu:0.001, Mo:0.33, Nb:0.035, V:0.09, Sb:0.00075.
Above-mentioned 300MW rotor of steam turbo generator thermal treatment heat treating method, its concrete process step is:
(1) workpiece is put into well formula heat treatment furnace, be warming up to 350 ℃ with the speed of 50 ℃/h, insulation 4h, and then be warming up to 650 ℃, insulation 6h with the speed of 50 ℃/h;
After (2) 650 ℃ of insulations, be warming up to 850 ℃ of quenching temperatures, insulation 22h with the speed of 60 ℃/h;
(3) workpiece is hung out from stove, precooling 5min in air puts into water and cools off 300min, from water, takes out after being cooled to surface temperature≤100 ℃.
(4) cooling finishes back shove charge tempering in time, is warming up to 350 ± 10 ℃, insulation 6h with the speed of 40 ℃/h;
After (5) 350 ± 10 ℃ of insulations finish, be warming up to 610 ℃ of tempering temperatures with the speed of 40 ℃/h, insulation 36h, the speed with≤15 ℃/h in stove is chilled to≤200 ℃ of air coolings of coming out of the stove.
According to the microalloying 25Cr2Ni4MoV rotor after the above heat treating method processing, each item performance index are as shown in table 1, can be found out by table 1 and all satisfy technical requirements.
Mechanical property after the thermal treatment of table 1 microalloying 300MW rotor of steam turbo generator
Claims (2)
1. 300MW rotor of steam turbo generator material microalloying, it is characterized in that: be added with microalloy element Nb in the chemical constitution of its rotor of steam turbo generator material, the content of Nb is 0.01-0.08% (mass percent).
2. the described 300MW rotor of steam turbo generator of claim 1 material heat treatment method, its process step is:
(1) workpiece is put into well formula heat treatment furnace, be warming up to 350 ± 10 ℃ with the speed of 30 ~ 60 ℃/h, insulation 3 ~ 5h, and then be warming up to 600 ~ 700 ℃, insulation 4 ~ 8h with the speed of 30 ~ 60 ℃/h;
After (2) 600 ~ 700 ℃ of insulations, be warming up to 800 ~ 900 ℃ of quenching temperatures, insulation 16 ~ 30h with the speed of 50 ~ 100 ℃/h;
(3) workpiece is hung out from stove, precooling 3 ~ 10min in air immerses in the water and cools off 120 ~ 400min, from water, hangs out after being cooled to surface temperature≤100 ℃;
(4) cooling finishes back shove charge tempering in time, is warming up to 350 ± 10 ℃, insulation 5 ~ 15h with the speed of 30 ~ 60 ℃/h;
(5) after insulation finishes, be warming up to 550 ~ 680 ℃ of tempering temperatures, insulation 20 ~ 50h with the speed of 30 ~ 60 ℃/h;
(6) after tempering insulation finished, the speed with≤10 ~ 15 ℃/h in stove was chilled to≤air cooling of coming out of the stove after 200 ~ 150 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110454854.3A CN102560245B (en) | 2011-12-30 | 2011-12-30 | Microalloying and heat treatment method for 300MW turbonator rotor material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110454854.3A CN102560245B (en) | 2011-12-30 | 2011-12-30 | Microalloying and heat treatment method for 300MW turbonator rotor material |
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| CN102560245A true CN102560245A (en) | 2012-07-11 |
| CN102560245B CN102560245B (en) | 2014-07-16 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1322256A (en) * | 1999-09-28 | 2001-11-14 | 日本钢管株式会社 | Hot-rolled steel sheet having high tensile strength and method for production thereof |
| CN101505081A (en) * | 2009-03-12 | 2009-08-12 | 中信重工机械股份有限公司 | Heat treatment process for 200MW or lower large size rotor |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1322256A (en) * | 1999-09-28 | 2001-11-14 | 日本钢管株式会社 | Hot-rolled steel sheet having high tensile strength and method for production thereof |
| CN101505081A (en) * | 2009-03-12 | 2009-08-12 | 中信重工机械股份有限公司 | Heat treatment process for 200MW or lower large size rotor |
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| CN102560245B (en) | 2014-07-16 |
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