CN102234706B - Method for refining grains of heavy forging steel of nuclear reactor evaporator - Google Patents
Method for refining grains of heavy forging steel of nuclear reactor evaporator Download PDFInfo
- Publication number
- CN102234706B CN102234706B CN2011102245014A CN201110224501A CN102234706B CN 102234706 B CN102234706 B CN 102234706B CN 2011102245014 A CN2011102245014 A CN 2011102245014A CN 201110224501 A CN201110224501 A CN 201110224501A CN 102234706 B CN102234706 B CN 102234706B
- Authority
- CN
- China
- Prior art keywords
- steel
- forging
- silicon
- vacuum
- smelting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a method for refining grains of heavy forging steel of a nuclear reactor evaporator, which belongs to the technical field of heat treatment of steel. The method comprises the following steps of: performing electric furnace smelting and ladle seconclary refining during steel production; performing vacuum pouring by an improved vacuum carbon deoxidation (VCD) process or a silicon killed deoxidation process and a subsequent multi-furnace pouring (MP) process to obtain 200 to 600 tons of steel ingots; accurately controlling the components of the steel in the smelting process, wherein the mass fraction of aluminum elements is between 0.02 and 0.04 percent, the mass fraction of nitrogen elements is between 0.005 and 0.015 percent, the mass fraction of silicon elements is less than 0.1 percent when the improved VCD process is used, and the mass fraction of the silicon elements is between 0.1 and 0.3 percent when the silicon killed deoxidation process is used; and homogenizing a forging state structure by a two-time normalizing preheating treatment process after the ingot is subjected to forging molding, and refining the grains. The method has the advantages that: the grains used for manufacturing the heavy forging steel of the nuclear reactor evaporator are obviously refined; and the level of the grain size is improved from a level 5 to a level 8.5.
Description
Technical field
The invention belongs to the Heat Treatment Of Steel technical field, a kind of nuclear reactor vaporizer method for refining grains of heavy forging steel particularly is provided, be applicable to the grain refining of the million kilowatt nuclear power reactor vaporizer heavy forging of SA508Gr.3Cl.2 low alloy steel, so that the homogeneous microstructure of vaporizer heavy forging steel, grain fineness number has been brought up to 8.5 grades from 5 grades, average grain size＜20 μ m finally obtains good comprehensive mechanical property.
Background technology
Along with fossil oil is the day by day exhausted of main Energy resources, and the continuous deterioration of global ecological environment, nuclear power has entered again the fast-developing phase.In recent years to the requirement of Nuclear power plants economy and security, the reactor output rating improves constantly, so that the maximization of reactor pressure vessel and vaporizer and the integrated trend that becomes, and the generation of Fukushima Nuclear Power Accident, the security of Nuclear power plants there has been higher requirement.Reactor pressure vessel in the Nuclear power plants and vapour generator heavy forging have very large size and section thickness, and in order to tackle possible failure conditions, this just requires the heavy forging steel to have good comprehensive mechanical property.The reactor pressure vessel forging adopts the SA508Gr.3Cl.1 steel making at present, and reactor vaporizer forging adopts the SA508Gr.3Cl.2 steel of high intensity levels to make.The ASME standard is different to the performance requriements of the SA508Gr.3 steel of two kinds of intensity ranks, and the SA508Gr.3Cl.2 steel is compared with the SA508Gr.3Cl.1 steel, and toughness reguirements is more or less the same, but yield strength is brought up to 450MPa by 345MPa.In industrial production, the reactor pressure vessel forging is relatively low because of intensity rank, not so difficult production.But the vaporizer forging of high intensity levels, particularly for the thicker heavy forging of wall thickness, intensity and impelling strength are difficult to reach simultaneously code requirement.
The current general employing electric arc furnace smelting+external refining of reactor pressure vessel forged steel in order to reduce the oxygen level in the steel, is often adopted the calm deoxidization technique of common aluminium, barium, calcium, silicon, manganese in deoxidation in steel making technique.In common calm deoxidization technique, aluminium and silicon are good reductors, and easy and oxygen reaction generates Al
2O
3And SiO
2Slag making has a small amount of Al in slag making
2O
3And SiO
2Be trapped in and form inclusion in the steel, reduce the performance of steel.Therefore, development in recent years vacuum carbon deoxidization (VCD) technique.VCD technique is than traditional calm deoxidization technique, and forging can obtain better toughness.Reactor forging steel thermal treatment process generally has conditioning heat treatment, property heat treatment and postwelding to disappear to answer thermal treatment.Carry out a normalizing+tempering conditioning heat treatment in property heat treatment as last, prepare for property heat treatment provides tissue.In the ASME standard grain fineness number of SA508Gr.3Cl.2 steel had strict demand, grain fineness number is greater than 5 grades.Yet for the high strength heavy forging that the vaporizer of large wall thickness is used, after common steel-making and thermal treatment process processing, grain fineness number is about 5 grades, and intensity and impelling strength are difficult to reach the ASME code requirement, and saying nothing of provides more safety margin value.Therefore, by the crystal grain of refinement vaporizer heavy forging steel, become the key that the advanced large nuclear power station reactor vaporizer heavy forging of assurance satisfies performance requriements.
Summary of the invention
The object of the present invention is to provide a kind of nuclear reactor vaporizer method for refining grains of heavy forging steel, the technical problem that solves is the grain refining that makes the million kilowatt nuclear power reactor vaporizer forging steel of SA508Gr.3Cl.2 low alloy steel, alleviation is because of the issuable mixed crystal phenomenon of forging segregation, and the problems such as performance requriements that are difficult to reach the ASME regulation and stipulation in the production of solution heavy forging.This method is through Composition Control, special process for making and appropriate thermal treatment process, and significantly refinement is for the manufacture of the crystal grain of reactor vaporizer heavy forging steel, acquisition grain-size＜20 μ m, and grain fineness number is 8.5 grades original austenite grain.Thereby can improve the use properties of reactor vaporizer heavy forging steel, especially can significantly improve the impelling strength of vaporizer forging steel, make the final mechanical property of forging reach the requirement of correlation technique standard.
Technical scheme of the present invention:
A kind of crystal fining method of nuclear reactor vaporizer heavy forging at first adopts special process for making, and the chemical ingredients of vaporizer heavy forging steel is controlled, and then after ingot casting forges forging is carried out the further crystal grain thinning of conditioning heat treatment technique twice.Detailed step is as follows:
Smelting technology
To raw materials for metallurgy, adopt electric arc furnace smelting+furnace outer refining process to process, in the vacuum deaeration treating processes, adopt subsequently follow-on vacuum carbon deoxidization technique, adding aluminium after vacuum-treat processes, in smelting process, accurately control chemical ingredients, the aluminium element massfraction is controlled to be 0.02～0.04%, and nitrogen element massfraction is controlled to be 0.005～0.015%, and the element silicon massfraction is controlled to be＜and 0.1%; Perhaps in the vacuum deaeration treating processes, adopt the calm deoxidization technique of silicon, silicon is to add when the vacuum-treat as reductor, and aluminium is to add after vacuum-treat, in smelting process, accurately control chemical ingredients, control aluminium element massfraction is 0.02～0.04%, nitrogen element massfraction is controlled to be 0.005～0.015%, and the element silicon massfraction is 0.1～0.3% molten steel.Smelt simultaneously many stoves molten steel, the many stoves by the advanced person close and water (MP) technique and pour into 200～600 tons large-scale steel ingot.Forge accordingly processing treatment to smelting successful steel ingot.
Thermal treatment process
After the heavy forging forging is made, heavy forging is carried out the normalizing conditioning heat treatment, its temperature should be controlled at Ac
3+ 80～130 ℃.Be heated to normalizing temperature 400 ℃ of shove charges with 100～200 ℃/h, be incubated after 3～5 hours, air cooling is to room temperature.Subsequently heavy forging is carried out the normalizing conditioning heat treatment second time, technique is with normalizing process is identical for the first time, and its temperature is controlled at Ac
3+ 80～130 ℃, be incubated the same time after, air cooling is to room temperature.Then carry out temper at 635～650 ℃, be incubated 5～8 hours, air cooling is to room temperature.
Physical metallurgy Epidemiological Analysis of the present invention:
The refinement of crystal grain mainly realizes by the forming core that promotes austenite crystal and the two kinds of approach of growing up that hinder austenite crystal.In austenitization, can provide by crystal boundary, phase boundary and the Second Phase Particle of separating out the position of forming core.And grain growth is realized by the grain boundary migration in-migration.Can crystal boundary migration carry out, and is subjected to again the mutual restriction of two kinds of reactive forces, and a kind of is to increase owing to system's free energy reduces the motivating force that crystal boundary is moved, and a kind of is the resistance (pining force) that the disperse Second Phase Particle hinders crystal boundary migration.
Aluminium is strong nitride forming element, is often used as the alloying element that adds for crystal grain thinning, and the solid-state precipitate of AlN can provide more austenite nucleation site, and can be in the process that austenite is grown up, and the pinning crystal boundary hinders growing up of austenite crystal.Only have when percent by volume, size and the distribution of AlN particle reach certain specific state, effectively the pinning crystal boundary.In the normalizing heat treatment process of vaporizer heavy forging steel, the AlN particle is disperse educt well, and the size of particle is tiny, thereby can play the effect of refine austenite crystal grain.
The further refining grain size of double normalizing conditioning heat treatment, principle is to adopt the thermal treatment that moves in circles for twice,
Between repeatedly phase co-conversion,
This process is mainly ferrite/bainite and is organized in the heat-processed at original austenite crystal prevention and lath of bainite circle place the nucleation site is provided, and forms new crystal grain, thereby reaches the effect of crystal grain thinning.
Beneficial effect of the present invention is:
Compare with art methods, the present invention is by the chemical ingredients in the special steel-smelting technology control steel, and by special thermal treatment process, reaches the effect of remarkable refinement nuclear reactor vapour generator heavy forging crystal grain, the average grain size that obtains＜20 μ m, grain fineness number reaches 8.5 grades.Simultaneously, the refinement of crystal grain and the homogenizing of tissue so that the heavy forging steel has obtained very good comprehensive mechanical property, have high intensity and good toughness, obtain to exceed more safety margin value than the mechanical property requirements in the ASME standard.
Description of drawings
The original austenite grain size (200 *) of the heavy forging steel of Fig. 1 Comparative Examples.
The original austenite grain size (400 *) of the heavy forging steel of Fig. 2 the invention process case 1.
The original austenite grain size (400 *) of the heavy forging steel of Fig. 3 the invention process case 2.
Embodiment
The crystal fining method of nuclear reactor vaporizer heavy forging of the present invention, at first adopt special smelting technology, composition to the heavy forging steel is accurately controlled, and then adopts double normalizing conditioning heat treatment technique to reach the effect of crystal grain thinning to the heavy forging steel after forging, and concrete grammar is as follows:
Smelting technology
To raw materials for metallurgy, adopt electric arc furnace smelting+furnace outer refining process to process, subsequently in the vacuum deaeration treating processes, adopt follow-on vacuum carbon deoxidization technique, add aluminium and process after vacuum-treat, accurately control chemical ingredients in smelting process, the aluminium element massfraction is controlled to be 0.02～0.04%, nitrogen element massfraction is controlled to be 0.005～0.015%, and the element silicon massfraction is controlled to be＜and 0.1%; Perhaps in the vacuum deaeration treating processes, adopt the calm deoxidization technique of silicon, silicon is to add when the vacuum-treat as reductor, and aluminium is to add after vacuum-treat, in smelting process, accurately control chemical ingredients, control aluminium element massfraction is 0.02～0.04%, and nitrogen element massfraction is controlled to be 0.005～0.015%, and the element silicon massfraction is 0.1～0.3% molten steel.Smelt simultaneously many stoves molten steel, the many stoves by the advanced person close and water (MP) technique and pour into 200～600 tons large-scale steel ingot.Forge accordingly processing treatment to smelting successful steel ingot.
Thermal treatment process
After the heavy forging forging is made, heavy forging is carried out the normalizing conditioning heat treatment, its temperature should be controlled at Ac
3+ 80～130 ℃.Be heated to normalizing temperature 400 ℃ of shove charges with 100～200 ℃/h, be incubated after 3～5 hours, air cooling is to room temperature.Subsequently heavy forging is carried out the normalizing conditioning heat treatment second time, technique is with normalizing process is identical for the first time, and its temperature is controlled at Ac
3+ 80～130 ℃, be incubated the same time after, air cooling is to room temperature.Then carry out temper at 635～650 ℃, be incubated 5～8 hours, air cooling is to room temperature.
2 groups of embodiment and 1 group of specifically bright the present invention of Comparative Examples have been adopted altogether.
Comparative Examples
The test steel that adopts the calm deoxidization technique of common silicon to smelt adopts the silicon deoxidization technique during steel-making, do not add aluminium in the test steel and process, so aluminium content is very low, and specific chemical composition sees Table 1.The test steel adopts one time normalizing heat treatment technique after 1150 ℃ of forgings: 400 ℃ of shove charges be heated to 150 ℃/h 900 ℃ of insulations after 5 hours air cooling carry out subsequently 650 ℃ and be incubated 8 hours to room temperature.Cut sample and carry out metallographic structure analysis, metallographic structure and grain-size are seen Fig. 1.Same batch sample carries out modifier treatment and the thermal treatment of simulation postwelding stress-removal, is processed into the stretching and the impact specimen that meet national standard and does mechanical property test, and test-results sees Table 4.
Case study on implementation 1
Adopt follow-on vacuum carbon deoxidization technique smelting test steel, adding aluminium before molten steel is poured into a mould after vacuum-treat processes, control aluminium element massfraction is 0.02～0.04%, nitrogen element massfraction is 0.005～0.015%, because employing vacuum carbon deoxidization, so the massfraction of element silicon＜0.1%, specific chemical composition sees Table 2.The test steel adopts the double normalizing thermal treatment process behind 1150 ℃ of hammer coggings: 400 ℃ of shove charges be heated to 150 ℃/h 900 ℃ of insulations after 5 hours air cooling carry out subsequently 640 ℃ of insulations 8 hours to room temperature, air cooling is to room temperature.Cut sample and carry out metallographic structure analysis, metallographic structure and grain-size are seen Fig. 2.Same batch sample carries out modifier treatment and the thermal treatment of simulation postwelding stress-removal, is processed into the stretching and the impact specimen that meet national standard and does mechanical property test, and test-results sees Table 4.Experimental result shows that the present invention has obtained tiny grain-size (＜20 μ m), meanwhile, has obtained good comprehensive mechanical property, especially impelling strength.The heat treatment furnace of thermal treatment process of the present invention, Control for Kiln Temperature precision are ± 3 ℃.
Case study on implementation 2
Adopt the calm deoxidation smelting test of silicon steel.During vacuum-treat, add the silicon deoxidation, add aluminium before molten steel is poured into a mould and process after vacuum-treat, control aluminium element massfraction is 0.02～0.04%, the massfraction of nitrogen element is 0.005～0.015%, and the massfraction of element silicon is 0.1～0.3%, and specific chemical composition sees Table 3.The test steel adopts the double normalizing thermal treatment process behind 1150 ℃ of hammer coggings: 400 ℃ of shove charges be heated to 150 ℃/h 900 ℃ of insulations after 5 hours air cooling carry out subsequently 640 ℃ of insulations 8 hours to room temperature, air cooling is to room temperature.Cut sample and carry out metallographic structure analysis, metallographic structure and grain-size are seen Fig. 3.Same batch sample carries out modifier treatment and the thermal treatment of simulation postwelding stress-removal, is processed into the stretching and the impact specimen that meet national standard and does mechanical property test, and test-results sees Table 4.Experimental result shows that the present invention has obtained tiny grain-size (＜20 μ m), meanwhile, has obtained good comprehensive mechanical property, especially impelling strength.The heat treatment furnace of thermal treatment process of the present invention, Control for Kiln Temperature precision are ± 3 ℃.
The chemical ingredients (wt%) of table 1* Comparative Examples, surplus is: Fe
| Element | C | Si | Mn | P | S | Cr |
| Become sub specification | ≤0.25 | ≤0.4 | 1.2～1.5 | ≤0.025 | ≤0.025 | ≤0.25 |
| Comparative Examples | 0.23 | 0.13 | 1.38 | 0.005 | 0.0079 | 0.21 |
| Element | Ni | Mo | V | N | Al | Fe |
| Become sub specification | 0.4～1.0 | 0.45～0.6 | ≤0.05 | - | ≤0.025 | bal |
| Comparative Examples | 0.78 | 0.57 | 0.0069 | 0.0088 | 0.0062 | bal |
* the Ac of this composition
3It is 815 ℃
The chemical ingredients (wt%) of table 2* embodiment 1, surplus is: Fe
| Element | C | Si | Mn | P | S | Cr |
| Become sub specification | ≤0.25 | ≤0.4 | 1.2～1.5 | ≤0.025 | ≤0.025 | ≤0.25 |
| Embodiment 1 | 0.24 | 0.019 | 1.47 | 0.005 | 0.005 | 0.21 |
| Element | Ni | Mo | V | N | Al | Fe |
| Become sub specification | 0.4～1.0 | 0.45～0.6 | ≤0.05 | - | ≤0.025 | bal |
| Embodiment 1 | 0.79 | 0.50 | 0.0058 | 0.0089 | 0.024 | bal |
* the Ac of this composition
3It is 805 ℃
The chemical ingredients (wt%) of table 3* embodiment 2, surplus is: Fe
| Element | C | Si | Mn | P | S | Cr |
| Become sub specification | ≤0.25 | ≤0.4 | 1.2～1.5 | ≤0.025 | ≤0.025 | ≤0.25 |
| Embodiment 2 | 0.22 | 0.23 | 1.48 | 0.006 | 0.004 | 0.16 |
| Element | Ni | Mo | V | N | Al | Fe |
| Become sub specification | 0.4～1.0 | 0.45～0.6 | ≤0.05 | - | ≤0.025 | bal |
| Embodiment 2 | 0.81 | 0.51 | 0.0055 | 0.0093 | 0.026 | bal |
* the Ac of this composition
3It is 810 ℃
Table 4 mechanical property test result
Claims (1)
1. nuclear reactor vaporizer method for refining grains of heavy forging steel, it is characterized in that: the technical parameter of processing step and control is:
Smelting technology
To raw materials for metallurgy, adopt electric arc furnace smelting+furnace outer refining process to process, subsequently in the vacuum deaeration treating processes, adopt vacuum carbon deoxidization technique, add aluminium and process after vacuum-treat, accurately control chemical ingredients in smelting process, the aluminium element massfraction is controlled to be 0.02～0.04%, nitrogen element massfraction is controlled to be 0.005～0.015%, and the element silicon massfraction is controlled to be＜and 0.1%;
Perhaps in the vacuum deaeration treating processes, adopt the calm deoxidization technique of silicon, silicon is to add when the vacuum-treat as reductor, and aluminium is to add after vacuum-treat, in smelting process, accurately control chemical ingredients, control aluminium element massfraction is 0.02～0.04%, and nitrogen element massfraction is controlled to be 0.005～0.015%, and the element silicon massfraction is 0.1～0.3% molten steel; Smelt simultaneously many stoves molten steel, the many stoves by the advanced person close the large-scale steel ingot that pouring technique pours into 200～600 tons; Forge accordingly processing treatment to smelting successful steel ingot;
Thermal treatment process
After the heavy forging forging is made, heavy forging is carried out the normalizing conditioning heat treatment, its temperature should be controlled at Ac
3+ 80～130 ℃; When furnace temperature is heated to 400 ℃, be heated to normalizing temperature with 100～200 ℃/h, be incubated after 3～5 hours, air cooling is to room temperature; Subsequently heavy forging is carried out the normalizing conditioning heat treatment second time, technique is with normalizing process is identical for the first time, and its temperature is controlled at Ac
3+ 80～130 ℃, be incubated the same time after, air cooling is to room temperature; Then carry out temper at 635～650 ℃, be incubated 5～8 hours, air cooling is to room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102245014A CN102234706B (en) | 2011-08-05 | 2011-08-05 | Method for refining grains of heavy forging steel of nuclear reactor evaporator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102245014A CN102234706B (en) | 2011-08-05 | 2011-08-05 | Method for refining grains of heavy forging steel of nuclear reactor evaporator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102234706A CN102234706A (en) | 2011-11-09 |
| CN102234706B true CN102234706B (en) | 2013-03-20 |
Family
ID=44885825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011102245014A Active CN102234706B (en) | 2011-08-05 | 2011-08-05 | Method for refining grains of heavy forging steel of nuclear reactor evaporator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102234706B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102925815A (en) * | 2012-10-31 | 2013-02-13 | 钢铁研究总院 | Martensite stainless steel for reactor internals of nuclear power station |
| CN103611892B (en) * | 2013-11-25 | 2016-03-02 | 钢铁研究总院 | A kind of smelting pouring procedure of vacuum carbon deoxidization fine-grained steel |
| CN103981347B (en) * | 2014-04-11 | 2016-08-17 | 中原特钢股份有限公司 | A kind of processing method of CrNiMoV high pressure steel forgings crystal grain refinement |
| CN104630443B (en) * | 2015-01-22 | 2017-02-22 | 燕山大学 | Large-scale cylindrical shell section heat treatment method |
| CN110899585B (en) * | 2018-09-17 | 2022-11-18 | 上海新闵重型锻造有限公司 | Die forging manufacturing method of steam outlet connecting pipe forging |
| CN110283974A (en) * | 2019-07-22 | 2019-09-27 | 洛阳中创重型机械有限公司 | A kind of heat treatment process of pressure vessel 12Cr2Mo1V steel forgings |
| CN111482544A (en) * | 2020-04-14 | 2020-08-04 | 中国原子能科学研究院 | Manufacturing method of steam generator forging for sodium-cooled fast reactor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1267736A (en) * | 2000-04-25 | 2000-09-27 | 钢铁研究总院 | Structural alloy steel crystallite superfining method |
| CN101509103A (en) * | 2008-12-24 | 2009-08-19 | 中信重工机械股份有限公司 | Prescription of large-scale hoister primary shaft forgeable piece material and grain refining processing technique |
| CN102134637A (en) * | 2011-01-18 | 2011-07-27 | 上海交通大学 | Method for refining grains of large medium high alloy steel forgings |
-
2011
- 2011-08-05 CN CN2011102245014A patent/CN102234706B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1267736A (en) * | 2000-04-25 | 2000-09-27 | 钢铁研究总院 | Structural alloy steel crystallite superfining method |
| CN101509103A (en) * | 2008-12-24 | 2009-08-19 | 中信重工机械股份有限公司 | Prescription of large-scale hoister primary shaft forgeable piece material and grain refining processing technique |
| CN102134637A (en) * | 2011-01-18 | 2011-07-27 | 上海交通大学 | Method for refining grains of large medium high alloy steel forgings |
Non-Patent Citations (2)
| Title |
|---|
| 国外核反应堆压力容器用A508_3钢及其制造;马飞良;《大型铸锻件》;19900831(第4期);第38页第5节，第39页第7节，第42页第1段，第43页第2段 * |
| 马飞良.国外核反应堆压力容器用A508_3钢及其制造.《大型铸锻件》.1990,(第4期), |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102234706A (en) | 2011-11-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102234706B (en) | Method for refining grains of heavy forging steel of nuclear reactor evaporator | |
| CN106917032B (en) | The method that reactor pressure vessel steels large thick-wall forging promotes low-temperature impact work | |
| CN108642403A (en) | A kind of 780MPa grade super strengths Fe-Mn-Al-C systems lightweight cast steel and preparation method thereof | |
| CN104532154A (en) | High-hardness high-polishing pre-hardening plastic die steel and manufacture technology thereof | |
| CN104046915A (en) | Large-section high-performance hot work die steel for die casting and preparation technology thereof | |
| CN102260826B (en) | High temperature resistant martensitic stainless steel and production method thereof | |
| CN102242316B (en) | H13 die steel and preparation method thereof | |
| CN102021490B (en) | X12CrMoWVNbN10-1-1 high-temperature structural steel and production method thereof | |
| CN101302599A (en) | Niobium microalloyed high strength hot work die steel and preparation thereof | |
| CN109972042B (en) | Low-temperature-resistant corrosion-resistant H-shaped steel with yield strength of 800MPa and preparation method thereof | |
| CN111057934A (en) | High-performance hot-work die steel and production process thereof | |
| CN102352466A (en) | High-carbon chromium bearing steel GCr15 and production method thereof | |
| CN101280394A (en) | High-silicon low-carbon high-heat resistance hot work die steel | |
| CN103361559B (en) | A kind of Nb, Ti combined microalloying high-temperature carburizing pinion steel | |
| CN101476082B (en) | High performance low cost hot work die steel | |
| CN105506454B (en) | 60~80mm of one kind thickness low cost Q460GJE Z35 steel plates and its production method | |
| CN103938096A (en) | High-strength high-toughness hot work die steel and preparation method thereof | |
| CN101333624B (en) | Anti-H2S stress corrosion high pressure resistant forgings and method for manufacturing same | |
| CN106399858B (en) | A kind of low-density Ti3Al enhancing unimach and preparation method thereof | |
| CN110527911A (en) | Anti-corrosion gear-bearing steel of a kind of low-density high-strength height and preparation method thereof | |
| CN105177446A (en) | Steel for 600-DEG C medium-temperature nuclear power pressure vessel and manufacturing method thereof | |
| CN105568177A (en) | Cu composite reinforced high-strength and toughness secondary hardening heat resistant steel and preparation method | |
| CN101220442B (en) | Hot work die steel with high-heat stability and high-strength | |
| CN102899589A (en) | High-strength non-tempered bainite steel and preparation method thereof | |
| CN102061426B (en) | 400-420mm large-thickness low-alloy high-strength constructional steel and production method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |