CN101407855A - Method for improving stress corrosion resistance of integral forging low-voltage rotor of nuclear steam turbine - Google Patents
Method for improving stress corrosion resistance of integral forging low-voltage rotor of nuclear steam turbine Download PDFInfo
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- CN101407855A CN101407855A CNA2007100469512A CN200710046951A CN101407855A CN 101407855 A CN101407855 A CN 101407855A CN A2007100469512 A CNA2007100469512 A CN A2007100469512A CN 200710046951 A CN200710046951 A CN 200710046951A CN 101407855 A CN101407855 A CN 101407855A
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- steam turbine
- stress corrosion
- nuclear steam
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Abstract
The invention relates to the field of metal processing, in particular to a method for improving the stress etching resistance of a monobloc forging low-pressure rotor of a nuclear turbine. The method for improving the stress etching resistance of the monobloc forging low-pressure rotor of the nuclear turbine includes the following steps of: heating a rotor material 30Cr2Ni4MoV to austenite temperature, cooling and tempering; wherein, the austenite temperature is between 830 and 860 DEG C; and the tempering temperature is between 565 and 670 DEG C. After the material is heated to the austenite temperature, the material is cooled by water for leading the yield strength to be lower than 760MPa. As the technical solution is adopted, the yield strength of the monobloc forging low-pressure rotor of the nuclear turbine achieves a certain index below 760MPa, which not only can meet the stress loading condition of the nuclear rotor, but also can meet the condition of stress etching resistance.
Description
Technical field
The present invention relates to the metal treatment field, particularly improve the method for stress corrosion resistance of integral forging low-voltage rotor of nuclear steam turbine.
Background technology
Metal heat treatmet is metal works to be placed on be heated to suitable temperature in certain medium, and after in this temperature, keeping certain hour, again with a kind of technology of friction-motion speed refrigerative.Metal heat treatmet is one of important process in the machinofacture, compare with other complete processing, thermal treatment does not generally change the shape and the whole chemical ingredients of workpiece, but by changing the microstructure of workpiece inside, or change the chemical ingredients of workpiece surface, give or improve the use properties of workpiece.Be characterized in improving the inner quality of workpiece, and this generally not to be naked eyes can see.
For making metal works have needed mechanical property, physicals and chemical property, except that reasonable select materials and various forming technology, thermal treatment process is requisite often.Iron and steel is a material most widely used in the mechanical industry, and the microstructure of iron and steel complexity can be controlled by thermal treatment, so the thermal treatment of iron and steel is the main contents of metal heat treatmet.In addition, aluminium, copper, magnesium, titanium etc. and alloy thereof also can change its mechanics, physics and chemical property by thermal treatment, to obtain different use propertieies.
Integral forging low-voltage rotor of nuclear steam turbine is that iron and steel is made.Existing thermal treatment process be with this forging even heating to austenitizing temperature, water-cooled or water spray cooling behind the insulation appropriate time, tempering under proper temperature makes yield strength be not less than 760MPa.Rotor is the nuclear steam turbine vitals, bears complex stress, and Working environment is wetting vapour, and the stress corrosion crack accident can take place the rotor that existing above-mentioned thermal treatment process processes, and influences the work-ing life of nuclear power rotor and the safety of nuclear steam turbine.
Summary of the invention
The objective of the invention is to overcome the deficiency of existing integral forging low-voltage rotor of nuclear steam turbine thermal treatment process, provide a kind of new thermal treatment process to improve stress corrosion resistance of integral forging low-voltage rotor of nuclear steam turbine.
Realize that the object of the invention technical scheme is: a kind of method of improving stress corrosion resistance of integral forging low-voltage rotor of nuclear steam turbine, comprise rotor material 30Cr2Ni4MoV is heated to austenitizing temperature, cooling and tempering, wherein, austenitizing temperature is 830 ℃～860 ℃, and tempering temperature is 565 ℃～670 ℃.
Above-mentioned being heated to behind the austenitizing temperature with water cooling so that yield strength is lower than 760MPa.
Owing to adopted above-mentioned technical solution, make the integral forging low-voltage rotor of nuclear steam turbine yield strength reach the following a certain suitable index of 760MPa, can satisfy nuclear power rotor stress load-up condition, can satisfy the stress corrosion resistant condition again.
Embodiment
Below the present invention is described in further detail.
The manufactured materials of integral forging low-voltage rotor of nuclear steam turbine is generally the 3.5CrNiMoV steel at present, and the domestic trade mark is the 30Cr2Ni4MoV steel.Table 1 is the chemical ingredients of this steel.The present invention is a research object with the 30Cr2Ni4MoV steel, and the research intensity grade is to the influence of stress corrosion dehiscence resistant.Table 2 is the mechanical characteristic data of this steel.
The chemical ingredients of table 1 30Cr2Ni4MoV steel
| C | Si | Mn | P | S | Ni | Cr | Mo | V | |
| Specification | ≤ 0.30 | ≤ 0.10 | 0.20- 0.40 | ≤ 0.007 | ≤ 0.007 | 3.25- 3.75 | 1.50- 2.00 | 0.30- 0.60 | 0.07- 0.15 |
| Actual | 0.28 | 0.06 | 0.22 | 0.004 | 0.002 | 3.35 | 1.85 | 0.42 | 0.089 |
The mechanical characteristic of table 2 30Cr2Ni4MoV steel
| Yield strength σ 0.2(MPa) | σ b(MPa) | Unit elongation δ % |
| 827 | 994 | 22.2 |
The position that the present invention is directed to the operation condition of nuclear steam turbine, the major impurity kind in the steam and concentration and stress corrosion easily takes place, with nuclear power integral forging low-voltage rotor material 30Cr2Ni4MoV steel is object, proposes to improve the method for stress corrosion resistance of integral forging low-voltage rotor of nuclear steam turbine.The present invention is on existing integral forging low-voltage rotor of nuclear steam turbine manufacturing process basis, suitably adjust thermal treatment temp, make mechanical property after the rotor thermal treatment reach the present invention and propose index, promptly the integral forging low-voltage rotor of nuclear steam turbine yield strength reaches the following a certain suitable index of 760MPa.By adjusting mechanical performance index, improve the rotor anti-stress corrosion performance, reach the purpose that improves the security of nuclear power low pressure rotor.
By heat treating regime is adjusted, rotor material 30Cr2Ni4MoV is heated to austenitizing temperature, cooling and tempering, wherein, austenitizing temperature is 830 ℃～860 ℃, tempering temperature is 565 ℃～670 ℃, above-mentioned thermal treatment can make yield strength reach the following a certain suitable index of 760MPa, can satisfy nuclear power rotor stress load-up condition, can satisfy the stress corrosion resistant condition again.
Embodiment 1
The 30Cr2Ni4MoV steel is heated to 850 ℃ of austenitizing temperatures, uses water cooling, 620 ℃ of tempering temperatures can obtain this steel intensity maximum, and yield strength is 827MPa.
Embodiment 2
The 30Cr2Ni4MoV steel is heated to 830 ℃ of austenitizing temperatures, uses water cooling, 640 ℃ of tempering temperatures, can obtain this steel yield strength is 753MPa.
Embodiment 3
The 30Cr2Ni4MoV steel is heated to 860 ℃ of austenitizing temperatures, uses water cooling, 670 ℃ of tempering temperatures, can obtain this steel yield strength is 661MPa.
Embodiment 4
The 30Cr2Ni4MoV steel is heated to 840 ℃ of austenitizing temperatures, uses water cooling, 565 ℃ of tempering temperatures, can obtain this steel yield strength is 680MPa.
Embodiment 5
The 30Cr2Ni4MoV steel is heated to 840 ℃ of austenitizing temperatures, uses water cooling, 590 ℃ of tempering temperatures, can obtain this steel yield strength is 750MPa.
Embodiment 6
The 30Cr2Ni4MoV steel is heated to 840 ℃ of austenitizing temperatures, uses water cooling, 650 ℃ of tempering temperatures, can obtain this steel yield strength is 730MPa.
Embodiment 7
The 30Cr2Ni4MoV steel is heated to 840 ℃ of austenitizing temperatures, uses water cooling, 670 ℃ of tempering temperatures, can obtain this steel yield strength is 640MPa.
Concrete 30Cr2Ni4MoV Heat Treatment Of Steel technology and yield strength see Table 3.
Table 3 30Cr2Ni4MoV Heat Treatment Of Steel technology and yield strength
Above embodiment is only for the usefulness that the present invention is described, but not limitation of the present invention, person skilled in the relevant technique, under the situation that does not break away from the spirit and scope of the present invention, can also make various conversion or modification, therefore all technical schemes that are equal to also should belong to category of the present invention, should be limited by each claim.
Claims (2)
1, a kind of method of improving stress corrosion resistance of integral forging low-voltage rotor of nuclear steam turbine, comprise rotor material 30Cr2Ni4MoV is heated to austenitizing temperature, cooling and tempering, it is characterized in that austenitizing temperature is 830 ℃～860 ℃, tempering temperature is 565 ℃～670 ℃.
2, a kind of method of improving stress corrosion resistance of integral forging low-voltage rotor of nuclear steam turbine according to claim 1 is characterized in that, is heated to behind the austenitizing temperature with water cooling so that yield strength is lower than 760MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100469512A CN101407855A (en) | 2007-10-11 | 2007-10-11 | Method for improving stress corrosion resistance of integral forging low-voltage rotor of nuclear steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100469512A CN101407855A (en) | 2007-10-11 | 2007-10-11 | Method for improving stress corrosion resistance of integral forging low-voltage rotor of nuclear steam turbine |
Publications (1)
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| CN101407855A true CN101407855A (en) | 2009-04-15 |
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Family Applications (1)
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| CNA2007100469512A Pending CN101407855A (en) | 2007-10-11 | 2007-10-11 | Method for improving stress corrosion resistance of integral forging low-voltage rotor of nuclear steam turbine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102251089A (en) * | 2011-07-14 | 2011-11-23 | 中国第一重型机械股份公司 | Heat treatment method for full diameter 30Cr2Ni4MoV low pressure rotor |
| CN106086360A (en) * | 2016-07-25 | 2016-11-09 | 杭州汽轮动力集团有限公司 | A kind of heat treatment method of Industrial Steam Turbine Rotors Aided forging |
| CN111151695A (en) * | 2019-12-31 | 2020-05-15 | 太原重工股份有限公司 | Forging heat treatment process of valve rod for steam turbine with material of 30Cr2Ni4MoV |
-
2007
- 2007-10-11 CN CNA2007100469512A patent/CN101407855A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102251089A (en) * | 2011-07-14 | 2011-11-23 | 中国第一重型机械股份公司 | Heat treatment method for full diameter 30Cr2Ni4MoV low pressure rotor |
| CN102251089B (en) * | 2011-07-14 | 2013-01-30 | 中国第一重型机械股份公司 | Heat treatment method for full diameter 30Cr2Ni4MoV low pressure rotor |
| CN106086360A (en) * | 2016-07-25 | 2016-11-09 | 杭州汽轮动力集团有限公司 | A kind of heat treatment method of Industrial Steam Turbine Rotors Aided forging |
| CN111151695A (en) * | 2019-12-31 | 2020-05-15 | 太原重工股份有限公司 | Forging heat treatment process of valve rod for steam turbine with material of 30Cr2Ni4MoV |
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Open date: 20090415 |