CN104630431A - Process for improving low-temperature toughness of a nuclear-power penetration piece - Google Patents
Process for improving low-temperature toughness of a nuclear-power penetration piece Download PDFInfo
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- CN104630431A CN104630431A CN201310562502.9A CN201310562502A CN104630431A CN 104630431 A CN104630431 A CN 104630431A CN 201310562502 A CN201310562502 A CN 201310562502A CN 104630431 A CN104630431 A CN 104630431A
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Abstract
The invention discloses a process for improving low-temperature toughness of a nuclear-power penetration piece. The process comprises the following steps of steel smelting, steel forging and heat treatment. By adopting the process provided in the invention, with respect to smelting, the content of harmful elements of P and S is reduced; the content of entrained impurities is reduced; the low-temperature toughness of the penetration piece is improved, and hardenability of the heat treatment of the penetration piece is increased. While with respect to forging, problems that the cast structure and defects of the penetration piece are fully eliminated, the density of the penetration piece is increased, defects are forged, forging deflection is increased as far as possible, and crystal grains are refined are mainly solved. Crystal grain refinement is beneficial for improvement of integration performance of the penetration piece and for improvement of the strength and the toughness of the penetration piece.
Description
Technical field
The present invention relates to nuclear power penetration piece, be specifically related to a kind of processing method improving nuclear power penetration piece low-temperature flexibility.
Background technology
ERP and AP1000 belongs to Generation Ⅲ, and China mainly have employed AP1000 now, and also will go into operation after except three and Haiyang construction successively.SA182F11 material is employed in a large number inside the nuclear power generating sets that AP1000 technology is built, if this material carries out manufacture not difficulty by SA182, but nuclear power generating sets SA182F11 forging used has the performance index higher than SAME SA182, especially forging mostly is large piece, such as mechanical penetration piece sleeve pipe, steel ingot weight reaches 20 tons, forging tube wall more than maximum ga(u)ge 300mm.This forging, except custom requirements, adds-7 DEG C of ballistic work 61J, requires to do drop weight test, measures TNDT temperature, and meets design requirement.For this heavy froging, manufacturing processes customary can not meet nuclear power performance requriements.
Summary of the invention
The present invention is directed to deficiency of the prior art, a kind of processing method improving nuclear power penetration piece low-temperature flexibility is provided.
The present invention is realized by following technical scheme: the processing method improving nuclear power penetration piece low-temperature flexibility, comprises the following steps,
(1) steel are smelted: adopt electrosmelting, vacuum outgas and esr mode to refine steel, reduce the content of P, S harmful element in steel,
Add a certain amount of manganese, chromium, molybdenum again to promote low-temperature flexibility and the thermal treatment hardening capacity of material;
(2) steel forging: adopt repeatedly the shaping way of jumping-up, pulling, punching and mandrel fully to eliminate material as-cast structure and defect, improve material density, defect is closed in forging, strengthens forging deformation amount as far as possible, crystal grain thinning simultaneously, promotes the over-all properties of material;
(3) thermal treatment: carry out Quench and temper process, shortens Quenching Soaking Time.
Wherein, steel preferably adopt SA182F11.
Wherein, in step (1), the content of manganese controls at 0.10%-1.50%, and the content of chromium controls at 0.50%-2.50%, and the content of molybdenum controls at 0.10%-2.50%.
Wherein, last forging times deflection of step (2) is not less than 20% of total deformation, and final forging temperature is not less than 800 DEG C.
Preferably, in step (3), the temperature of quenching is 900 DEG C.
Wherein, the temperature in step (3) during tempering is 650 DEG C.
Soaking time proper extension when modified front normalizing treatment, to eliminate component segregation.
Compared with prior art, adopt processing method provided by the present invention in smelting, reduce P, S harmful element content, reduce inclusion content, promote material at low temperature toughness, add the thermal treatment hardening capacity of material: the problem mainly solved in forging process fully eliminates material as-cast structure and defect, improve material density, defect is closed in forging, strengthen forging deformation amount as far as possible, simultaneously crystal grain thinning.Crystal grain thinning is conducive to promoting material over-all properties, and intensity and toughness can promote simultaneously.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment one:
Steel are smelted: adopt electrosmelting, vacuum outgas and esr mode to refine steel, reduce the content of P, S harmful element in steel, the content of adjustment manganese, chromium, molybdenum makes its content be: manganese 0.50%, chromium 1.5%, molybdenum 0.5% are to promote low-temperature flexibility and the thermal treatment hardening capacity of material;
Steel forge: adopt repeatedly jumping-up, pulling, punching and mandrel forming processes.
Wherein, last forging times deflection is not less than 20% of total deformation, and final forging temperature is 900 DEG C.
Thermal treatment: carry out Quench and temper process, the temperature of quenching is 900 DEG C and suitably shortens the heating and thermal insulation time, and temperature during tempering is 650 DEG C.
Embodiment two:
Steel are smelted: adopt electrosmelting, vacuum outgas and esr mode to refine steel, reduce the content of P, S harmful element in steel, the content of adjustment manganese, chromium, molybdenum makes its content be: manganese 0.80%, chromium 1.35%, molybdenum 0.65% are to promote low-temperature flexibility and the thermal treatment hardening capacity of material;
Steel forge: adopt repeatedly jumping-up, pulling, punching and mandrel forming processes.
Wherein, last forging times deflection is not less than 20% of total deformation, and final forging temperature is 1000 DEG C.
Thermal treatment: carry out Quench and temper process, the temperature of quenching is 900 DEG C and suitably shortens the heating and thermal insulation time, and temperature during tempering is 650 DEG C.
The foregoing is only and embody the preferred embodiment of the principle of the invention, therefore do not limit protection scope of the present invention, every equalization change done according to the present invention with modify within the scope of the claims of all containing in the present invention.
Claims (5)
1. improve the nuclear power processing method of penetration piece low-temperature flexibility, it is characterized in that: comprise the following steps,
(1) steel are smelted: adopt electrosmelting, vacuum outgas and esr mode to refine steel, reduce the content of P, S harmful element in steel,
Add a certain amount of manganese, chromium, molybdenum again to promote low-temperature flexibility and the thermal treatment hardening capacity of material;
(2) steel forging: adopt repeatedly the shaping way of jumping-up, pulling, punching and mandrel fully to eliminate material as-cast structure and defect, improve material density, defect is closed in forging, strengthens forging deformation amount as far as possible, crystal grain thinning simultaneously, promotes the over-all properties of material;
(3) thermal treatment: carry out Quench and temper process, shortens Quenching Soaking Time.
2. the processing method improving nuclear power penetration piece low-temperature flexibility as claimed in claim 1, it is characterized in that: in described step (1), the content of manganese controls at 0.10%-1.50%, the content of chromium controls at 0.50%-2.50%, and the content of molybdenum controls at 0.10%-2.50%.
3. the raising nuclear power processing method of penetration piece low-temperature flexibility as claimed in claim 1, is characterized in that: last forging times deflection of described step (2) is not less than 20% of total deformation, and final forging temperature is not less than 800 DEG C.
4. the raising nuclear power processing method of penetration piece low-temperature flexibility as claimed in claim 1, is characterized in that: in described step (3), the temperature of quenching is 900 DEG C.
5. the raising nuclear power processing method of penetration piece low-temperature flexibility as described in claim 1 or 4, is characterized in that: the temperature in described step (3) during tempering is 650 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310562502.9A CN104630431A (en) | 2013-11-11 | 2013-11-11 | Process for improving low-temperature toughness of a nuclear-power penetration piece |
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| CN201310562502.9A CN104630431A (en) | 2013-11-11 | 2013-11-11 | Process for improving low-temperature toughness of a nuclear-power penetration piece |
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| CN104630431A true CN104630431A (en) | 2015-05-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115323136A (en) * | 2022-08-19 | 2022-11-11 | 无锡派克新材料科技股份有限公司 | Method for manufacturing 15 KHM 3 MHMA shell forging for nuclear power component |
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| CN102392195A (en) * | 2011-12-15 | 2012-03-28 | 钢铁研究总院 | High-strength high-toughness nuclear power pressure vessel forging steel and its manufacturing method |
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Patent Citations (6)
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| CN101476088A (en) * | 2008-12-31 | 2009-07-08 | 钢铁研究总院 | R17Cr1Ni3Mo steel for nuclear pressure vessel and preparation thereof |
| CN101892429A (en) * | 2010-06-29 | 2010-11-24 | 上海大学 | High-toughness cold-work mould steel and preparation method thereof |
| CN102071367A (en) * | 2010-11-24 | 2011-05-25 | 南京迪威尔重型锻造股份有限公司 | Steel forging manufacturing process for deep-sea Christmas tree equipment connectors |
| CN102029347A (en) * | 2010-12-29 | 2011-04-27 | 中原特钢股份有限公司 | Manufacturing method of gear shaft forge piece for offshore drilling platform |
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Cited By (2)
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| CN115323136A (en) * | 2022-08-19 | 2022-11-11 | 无锡派克新材料科技股份有限公司 | Method for manufacturing 15 KHM 3 MHMA shell forging for nuclear power component |
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Application publication date: 20150520 |