CN101812624A - Preparation of 1 Cr (Chromium) 13 thick wall tubular products of control rod of nuclear reactor control bar drive mechanism - Google Patents
Preparation of 1 Cr (Chromium) 13 thick wall tubular products of control rod of nuclear reactor control bar drive mechanism Download PDFInfo
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Abstract
The invention aims at providing a preparation method of 1 Cr (Chromium) 13 thick wall tubular products of a control rod of a nuclear reactor control bar drive mechanism. By adopting the method, 1 Cr 13 thick wall tubular products with high intensity and toughness and total accordance with the mechanical property requirements of the control rod of the nuclear reactor control bar drive mechanism can be prepared. The performances of the finished product tubular products all achieve or exceed the performance data of import real tubular products. The preparation method has the advantages of simple process, high production efficiency and low cost, and thoroughly solves the problem that the tubular products are imported for a long time.
Description
Technical field
The present invention relates to preparation of pipes, is a kind of preparation method of 1 Cr (Chromium) 13 thick wall tubular products of control rod of nuclear reactor control bar drive mechanism specifically.
Background technology
Along with increasingly sharpening of energy dilemma, many in the world countries are greatly developing the nuclear power industry.China's nuclear power generating ratio is also very little in total generating ratio, and therefore China has also released the grand blueprint of greatly developing nuclear power.It is reported that the Nuclear power plants that China plans to start building to build before the year two thousand twenty reaches more than 30, also have many seat Nuclear power plants simultaneously just in addressing or demonstration stage.
Still be technical no matter at equipment, member, built up at present and also very low in the production domesticization ratio of the nuclear power generating sets of building, national departments concerned has emphasized that the construction of follow-up nuclear power generating sets will especially will break away from external long-term dependence in equipment and the technical ratio that progressively improves production domesticization on key part.Wherein, rod drive mechanism is exactly a key component of being badly in need of the in-pile component of realization production domesticization.And control lever (driving stem) is a key part maximum in the rod drive mechanism, is made by 1Cr13 Martensite Stainless Steel thick-wall tube, at present the whole dependence on import of this tubing.The major function of nuclear power station reactor control stick driving mechanisms control bar is to regulate the power of nuclear reactor, and its main action is can move up and down in time, rapidly, reliably when needed to control the turnover of fuel control rod.The more important thing is when emergency situation takes place, can pile the control rod insertion reaction to realize shutdown apace.Therefore, require control lever both to have high strength, have high tenacity again, also need simultaneously Hardness Control in specialized range.
Can predict, along with country to raising gradually in the production domesticization index of building and being about to build Nuclear power plants, nuclear power plant reactor driving mechanisms control bar also must rely on production domesticization, the mechanical workout of control lever can a plurality of at home enterprises be finished at present, the subject matter of restriction production domesticization is that tubing is still needed and wanted external import, therefore, the key of driving mechanism production domesticization is exactly a 1Cr13 tubing.Nuclear power plant reactor driving mechanisms control bar will promote China's nuclear power localization rate of parts and components with 1Cr13 tubing production domesticization research success, also will break away from the long-term predicament that relies on external import of crucial goods.
Compare with common 1Cr13 tubing, nuclear power all has a great difference with the 1Cr13 thick-wall tube on composition, cold and hot working and finished product thermal treatment process, and equipment and technology are all had strict requirement.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of 1 Cr (Chromium) 13 thick wall tubular products of control rod of nuclear reactor control bar drive mechanism, the contriver is through research for many years, a large amount of experiments, finally find out technology of the present invention simple, save cost and can guarantee the preparation method of the 1Cr13 thick-wall tube of end properties quality, it is characterized in that:
---the stainless smelting of 1Cr13:
Nuclear power plants command bundle rods for nuclear reactors drive mechanism bar is to be prepared from the 1Cr13 stainless steel by nuclear power with the 1Cr13 thick-wall tube, this stainless steel is compared with common 1Cr13 stainless steel, its chemical ingredients is except requiring to carry out the strictness restriction to the existing C of common 1Cr13, Si, Mn, Cr, S, P, also increased composition range requirement to Ni, B, Co, N, O, require constituent contents low as far as possible (every kind of content≤0.005%) such as Pb, Sn, Sb, Bi, As, Al, Ce, La, Mo simultaneously, measured data (its chemical ingredients requires to see Table 1) is provided.By chemical ingredients being carried out strictness control, the ferrite content in the tubing that could guarantee to be processed into is less than 10%, and in the time of intensity, hardness raising, impelling strength does not reduce.
Table 1 nuclear power requires (%) with the 1Cr13 stainless steel chemical component
| Element | ??C | ??Mn | ??P | ??S | ??Ni | ??O | ??Si |
| Content (%) | ??0.10～??0.15 | ??0.50～0.75 | ??≤0.015 | ??≤0.010 | ??0.40～0.50 | ??＜0.005 | ??0.25～0.50 |
| The finished product deviation | ??+0.02 | ??+0.05 | ??+0.005 | ??+0.005 | ??±0.05 | ??- | ??+0.05 |
| Element | ??Cr | ??B | ??Co | ??N | ??Cu | ??Fe | |
| Content (%) | ??12～13 | ??≤0.0020 | ??≤0.05 | ??＜0.015 | ??＜0.20 | Surplus | |
| The finished product deviation | ??±0.15 | ??- | ??- | ??- | ??- |
Therefore, this nuclear power need adopt the method for induction furnace smelting+esr to smelt with the 1Cr13 stainless steel and obtain, wherein:
The induction furnace smelting technology:
Melting period: adopt the induction smelting furnace to smelt, furnace charge is 85.25～86.85% shove charge capacity, the pure iron of purity 〉=98%, the electrolytic nickel of the Metal Cr of 12～13% shove charge capacity and 0.4～0.50% shove charge capacity; Use 1/4～1/2 of full power to send electrically heated 30～60 minutes, after the incipient melting molten steel occurring, furnace charge is complete when red, uses 2/3～1 fusing of full power clear until whole furnace charges fusings;
Refining period: be warming up to 1550 ℃ ± 10 ℃, be incubated 15 ± 5 minutes;
The alloying phase: after finishing refining period, having a power failure makes molten steel temperature reduce to surperficial conjunctiva; Send electricity with the conjunctiva fusing then, again according to the metal M n of order of addition(of ingredients) with 0.50～0.75% shove charge capacity, the metal Si of 0.25～0.5% shove charge capacity adds in the molten steel; Should try one's best in the alloying process adds each element lentamente, prevents to splash, and guarantees that alloying constituent is accurate.
Electroslag remelting process:
Prepare before smelting:
Electrode: adopt cast electrode bar or forging to form the esr electrode bar, electrode size is 3 * 100mm steel ingots, and the water-cooled copper crystallizer: the crystallizer diameter is 500mm;
Slag system: ternary slag CaF
2: Al
2O
3: MgO
2=30%: 65%: 5%, use preceding 600 ℃ of bakings 4 hours;
Base plate: copper coin or iron plate; Heelpiece: 1Cr13 sheet; Striking agent: solid conduction striking, striking agent composition: CaF
2: TiO
2=50%: 50%;
The electroslag remelting process parameter:
Quantity of slag A:A=1/4 π D
2H γ, D are the crystallizer diameter, and depth of slag bath h is 1/3～1/2 of a crystallizer diameter, and the density of slag is at 2400～2500Kg/m
3
Working current I:I=SJ, S are the area of section of consumable electrode, the mm of unit
2, J is a current density, the A/mm of unit
2, J=56/d
Electrode-0.05, d
ElectrodeBe electrode diameter, the cm of unit;
Smelt voltage U: U=0.5d
Electrode+ B, B are 27～37V.
Above-mentioned % all refers to weight percent.
By smelting technology of the present invention, can strictly control the stainless chemical ingredients of 1Cr13, thereby make it meet the Nuclear power plants command bundle rods for nuclear reactors drive mechanism bar stainless performance requriements of 1Cr13.
---the preparation of pipe:
The pipe of austenitic stainless steel pipe material carries out hot piercing after making the tissue that normally adopts certain heating cycle to obtain complete austenitizing.Nuclear power plants command bundle rods for nuclear reactors drive mechanism bar is made of the pipe of 1Cr13 thick-wall tube and then is difficult to take same technology, even main difficulty is that thereby still remaining a certain amount of ferritic structure causes the hot piercing resistance to deformation bigger after the heating of 1Cr13 steel, inner surface quality after the perforation is bad, and easy to crack, thereby cause pipe to be scrapped.One of production domesticization research reason of not succeeding is exactly that hot tearing causes the tube billet yield rate extremely low in history.The external general hot extrusion technique that adopts is made 1Cr13 heavy wall pipe.But because the heat extruder of domestic rarer suitable extrusion tube blank specially, and this technology cost is higher, and therefore need simple relatively, the relatively low hot piercing process of expense of research technology.
The invention provides satisfactory hot piercing process, it is characterized in that:
(1) excellent base processing: through the 1Cr13 stainless steel ingot casting that induction smelting+esr obtains, (forging process is: room temperature is gone into stove, heats up with stove, slowly is heated to 1150 ℃, insulation 2～3 through forging
Hour; Initial forging temperature: 1150 ℃, 850 ℃ of final forging temperatures, the ratio of bar sectional area is that forging ratio is greater than 3 before and after forging) after obtain
Bar.After abrasive cutoff saw is pressed 1800mm scale cutting, adopt flaying machine or lathe to strip off the skin, the excellent base outside dimension after stripping off the skin is 105mm, nonstraightness is less than 1.0mm/m, surfaceness≤Ra6.4;
(2) heating installation: coal gas roller hearth furnace;
(3) heating process is:
Gained rod base cold charge is gone into stove,, be heated to 1100～1180 ℃ with speed then, be incubated 15～30 minutes greater than 2 ℃/minute 650～850 ℃ of following soaking of low-temperature zone temperature 90～120 minutes.Bar need often stir when heating and insulation, to guarantee homogeneous heating.Optimised process is: gained rod base cold charge is gone into stove, 850 ℃ of insulations 120 minutes, be heated to 1150 ℃ with 3 ℃ of/minute speed then, be incubated 20 minutes.
(4) hot piercing equipment: the 76 reinforced or seamless tapping machinees of 90 types;
(5) perforating head: molybdenum base alloy top; Lubricant: glass powder.
(6) cooling: the perforation postcooling, control its speed of cooling and be cooled to room temperature less than 100 ℃/hour.Method of cooling: preferably adopt the pure aluminium silicate asbestos mat of thickness 30mm to coat cooling.
The 1Cr13 pipe that hot piercing is finished will carry out surface quality and dimensional inspection:
(1) dimension inspection
Hollow forging tolerance dimension after the hot piercing should be controlled at: 110 ± 0.5mm * 20 ± 0.3mm.The size detection instrument must be to be up to the standards and to be in instrument in the usage period: vernier callipers check pipe external diameter, ruler check pipe length, wall thickness micrometer gauge check pipe wall thickness.
Outside diameter measuring: measure 3 points along three circumferential sections of pipe length direction, each circumferential section.
Wall thickness measuring: the tubing two ends are respectively along circumferential section directional survey 3 points.
Linear measure: along the pipe length directional survey.
(2) surface quality inspection
1Cr13 pipe surface after the hot piercing does not allow crackle that naked eyes can see, scabs, scuffing, laps, folding and be mingled with, and allows to count half indivedual tiny cut, impression, the pit that are no more than tolerance from physical size and exist.
Adopt the pipe of above-mentioned prepared, surface quality is good, and not easy to crack, and the production efficiency height, and cost is low, be fit to produce in enormous quantities (tens tons and up to a hundred tons turnout).
---the cold machine-shaping of tubing:
Nuclear power plants command bundle rods for nuclear reactors drive mechanism bar uses the wall thickness external diameter ratio of 1Cr13 thick-wall tube greater than 0.2, and the surfaces externally and internally deformation rate differs greatly when cold rolling, easily causes limit edging to split, thereby whole Zhi Guancai cracking is scrapped fully.Simultaneously, because 1Cr13 is the half martensite stainless steel, work hardening rate is big, difficulty but also equipment is impacted Da Yi cause tool damage when not only cold rolling, and rolling accuracy and surface quality also are difficult to control, promptly are difficult to control and reach finished product tubing tolerance
Surfaceness internal surface of pipe roughness requirement≤Ra1.6 μ m.The key that solves an above-mentioned difficult problem is exactly how to determine suitable pass deformation rate and rolling technological parameter.
In order to guarantee the rolling smoothly of tubing, prevent damage equipment and the cracking that rolls back tubing, guarantee that simultaneously the tolerance of dimension of finished product tubing and surface quality reach requirement (finished product tubing tolerance
Internal surface of pipe roughness requirement≤Ra1.6 μ m), need cold worked pass deformation rate of pipe and rolling technological parameter are limited: control passage cumulative deformation is 25～40%, the cold reducing mill feed is 2～5mm/ time, and the head number of oscillations is 30～60 times/minute.
If the accumulative total pass deformation surpasses 40%, the maximum feed of cold reducing mill surpasses 5mm/ time, and head full swing number of times surpasses 60 times/minute, then easily causes rolling tubing termination, back cracking.
The tubing that adopts above-mentioned processes to form, its tolerance of dimension and surface quality all can reach the requirement that nuclear power is used, and the production efficiency height, and cost is low, be fit to produce in enormous quantities (tens tons and up to a hundred tons turnout).
---the thermal treatment of finished product:
Compare with common 1Cr13 material property, Nuclear power plants command bundle rods for nuclear reactors drive mechanism bar has not only improved intensity, hardness requirement with the performance requriements (table 2) of 1Cr13 thick-wall tube, has also improved the impelling strength requirement.Abroad general employing is vacuum heat treatment+oil cooling, and nuclear power uses 1Cr13 tubing finished product length more than 8 meters, at present the domestic appropriate heat treatment equipment that does not also have length like this.How at home take proper heat treatment technology under the current thermal treatment equipment condition and guarantee that the performance of finished product tubing is exactly the heat treated key problem in technology of finished product.
The table 2 Nuclear power plants command bundle rods for nuclear reactors drive mechanism bar mechanical property requirements of 1Cr13 thick-wall tube
| σ b，MPa | ??σ s，MPa | ?δ 5，％ | ??ψ，％ | ??α k(J/cm 2) | Hardness, HRC |
| ≥690 | ??≥550 | ?≥18 | ??≥50 | ??≥40 | ?17～27 |
The invention provides the thermal treatment process of this nuclear power with the 1Cr13 thick-wall tube, it is characterized in that: place tubular type protective atmosphere heat treatment furnace to heat-treat with 1Cr13 thick-wall tube finished product on Nuclear power plants command bundle rods for nuclear reactors drive mechanism bar, processing parameter is: be incubated 1～2 hour down at 1000～1050 ℃, air cooling is cooled to room temperature, controlled chilling speed＜500 ℃/h; 650～700 ℃ of down insulations 3～5 hours, air cooling is cooled to room temperature, controlled chilling speed＜500 ℃/h.
If change above-mentioned thermal treatment process, the intensity of gained finished product tubing then, impelling strength or hardness etc. will be lower than the value of mechanical property requirements shown in the table 2.
Adopt the preparation method of command bundle rods for nuclear reactors driving mechanisms control bar of the present invention with the 1Cr13 thick-wall tube, can prepare high strength, high tenacity and meet the 1Cr13 thick-wall tube of command bundle rods for nuclear reactors driving mechanisms control bar with mechanical property requirements fully, its finished product pipe performance has has all met or exceeded the performance data of import tubing in kind.This preparation method's technology is simple, the production efficiency height, and cost is low, and can thoroughly break away from long-term, all predicaments of dependence on import of this tubing.
Description of drawings
Fig. 1 tube surfaces quality figure;
Fig. 2 tube surfaces quality figure;
Fig. 3 tube surfaces quality figure;
Fig. 4 tube surfaces quality figure;
Fig. 5 tube surfaces quality figure;
Fig. 6 gained tubing metallograph;
Fig. 7 tubing termination cracking figure;
Fig. 8 tubing termination cracking figure;
Fig. 9 gained tubing metallograph.
Embodiment
Embodiment 1～5
---the stainless smelting of 1Cr13:
Induction is smelted: adopt 2 tons of induction smelting furnaces to smelt; Crucible is the hip moulding crucible, and before use must be through overbaking, removes the gas that is adsorbed on the crucible, steam, impurity etc.Furnace charge is that purity is that 98% pure iron, purity are that 99% chromium metal, purity are that 99.9% electrolytic nickel, purity are that 97% manganese metal and purity are 99% Pure Silicon Metal, and its add-on sees Table 3.The induction smelting technology is as shown in table 4.
Table 3 alloy smelting charge composition (%)
| Embodiment | ??Cr | ??Ni | ??Mn | ??Si | ??Fe |
| ??1 | ??12.3％ | ??0.45％ | ??0.60％ | ??0.36％ | Surplus |
| ??2 | ??12.0％ | ??0.50％ | ??0.72％ | ??0.50％ | Surplus |
| ??3 | ??13.0％ | ??0.40％ | ??0.75％ | ??0.45％ | Surplus |
| ??4 | ??12.6％ | ??0.48％ | ??0.65％ | ??0.50％ | Surplus |
| ??5 | ??12.0％ | ??0.45％ | ??0.58％ | ??0.57％ | Surplus |
Table 4 alloy induction smelting process parameter
| Embodiment | The induction smelting process parameter |
| 1 | 1/3 rated output * 50 minute, 3/4 appraised and decided Power x 160 minutes; Be warming up to 1550 ℃ ± 10 ℃, be incubated 15 minutes |
| 2 | 2/5 rated output * 45 minute, 3/4 appraised and decided Power x 150 minutes; Be warming up to 1550 ℃ ± 10 ℃, be incubated 15 minutes |
| 3 | 1/2 rated output * 40 minute, 4/5 appraised and decided Power x 125 minutes; Be warming up to 1550 ℃ ± 10 ℃, be incubated 15 minutes |
| 4 | 1/4 rated output * 60 minute, 3/4 appraised and decided Power x 165 minutes; Be warming up to 1550 ℃ ± 10 ℃, be incubated 15 minutes. |
| 5 | 1/2 rated output * 50 minute, 3/4 appraised and decided Power x 150 minutes; Be warming up to 1550 ℃ ± 10 ℃, be incubated 15 minutes |
Esr: (processing parameter sees Table 5)
Prepare before smelting:
Electrode: adopt cast electrode bar or forging to form the esr electrode bar, electrode size is 3 * 100mm steel ingots, water-cooled copper crystallizer: crystallizer diameter 500mm;
Slag system: ternary slag CaF
2: Al
2O
3: MgO
2=30%: 65%: 5%, use preceding 600 ℃ of bakings 4 hours;
Base plate: copper coin or iron plate; Heelpiece: 1Cr13 sheet; Striking agent: solid conduction striking, striking agent composition: CaF
2: TiO
2=50%: 50%.
Table 5 electroslag remelting process parameter
| Embodiment | The electroslag remelting process parameter |
| ??1 | Quantity of slag 85Kg, electric current 12010A, voltage 60V |
| ??2 | Quantity of slag 92Kg, electric current 12050A, voltage 62V |
| ??3 | Quantity of slag 95Kg, electric current 12080A, voltage 58V |
| Embodiment | The electroslag remelting process parameter |
| ??4 | Quantity of slag 85Kg, electric current 12040A, voltage 59V |
| ??5 | Quantity of slag 92Kg, electric current 12015A, voltage 61V |
---the preparation of pipe:
To smelt the gained alloy after forging, obtain
The 1Cr13 stainless steel bars after abrasive cutoff saw is pressed 1800mm scale cutting, adopts flaying machine to strip off the skin, and the excellent base outside dimension after stripping off the skin is 105mm, and nonstraightness is less than 1.0mm/m, surfaceness≤Ra6.4;
Piercing process: adopt the seamless tapping machine of 90 types to carry out hot piercing, perforating head is the molybdenum base alloy top, and lubricant is a glass powder.
Heating installation: coal gas roller hearth furnace.
Method of cooling: it is the pure aluminium silicate asbestos mat coating pipe of 30mm that thickness is adopted in the perforation back, is cooled to room temperature.
The hot piercing working process parameter sees Table 6, and the control of gained size of pipe and tubing tolerance sees Table 7.
Table 6 hot piercing working process parameter
| Embodiment | The hot piercing working process parameter |
| ??1 | 650 ℃ * 90 minutes, heat up with 3 ℃/minute speed, 1140 ℃ * 30 minutes, bore a hole, be cooled to room temperature |
| ??2 | 800 ℃ * 80 minutes, heat up with 4 ℃/minute speed, 1150 ℃ * 30 minutes, bore a hole, be cooled to room temperature |
| ??3 | 780 ℃ * 90 minutes, heat up with 3 ℃/minute speed, 1140 ℃ * 25 minutes, bore a hole, be cooled to room temperature |
| ??4 | 810 ℃ * 85 minutes, heat up with 5 ℃/minute speed, 1120 ℃ * 30 minutes, bore a hole, be cooled to room temperature |
| ??5 | 850 ℃ * 80 minutes, heat up with 3 ℃/minute speed, 1160 ℃ * 25 minutes, bore a hole, be cooled to room temperature |
The control of table 7 size of pipe and tubing tolerance
---the cold machine-shaping of tubing: every time cold-rolling equipment and processing parameter control are shown in table 8～12, and gained finished product tubing tolerance of dimension and surfaceness see Table 13,14.
Table 8 embodiment 1 rolling technological parameter
| The processing passage | External diameter | Wall thickness | Processing units | Internal diameter | The accumulative total deflection | Feed (mm/ time) | Number of oscillations (inferior/minute) |
| ??110 | ??20 | ??70 | |||||
| ??1 | ??89 | ??18 | ??LG120 | ??53 | ??29.00％ | ??4 | ??30 |
| ??2 | ??76 | ??15 | ??LG90 | ??46 | ??28.40％ | ??4 | ??30 |
| ??3 | ??60 | ??13.5 | ??LG55 | ??33 | ??31.39％ | ??5 | ??50 |
| ??4 | ??47.5 | ??12.5 | ??LG55 | ??22.5 | ??30.31％ | ??3 | ??45 |
Table 9 embodiment 2 rolling technological parameters
| The processing passage | External diameter | Wall thickness | Processing units | Internal diameter | The accumulative total deflection | Feed (mm/ time) | Number of oscillations (inferior/minute) |
| ??110 | ??20 | ??70 | |||||
| ??1 | ??90 | ??18 | ??LG120 | ??53 | ??28.00％ | ??5 | ??50 |
| ??2 | ??78 | ??15 | ??LG90 | ??46 | ??27.08％ | ??5 | ??60 |
| ??3 | ??62 | ??13 | ??LG55 | ??33 | ??32.59％ | ??5 | ??60 |
| The processing passage | External diameter | Wall thickness | Processing units | Internal diameter | The accumulative total deflection | Feed (mm/ time) | Number of oscillations (inferior/minute) |
| ??4 | ??47.5 | ??12.5 | ??LG55 | ??22.5 | ??31.32％ | ??3 | ??45 |
Table 10 embodiment 3 rolling technological parameters
| The processing passage | External diameter | Wall thickness | Processing units | Internal diameter | The accumulative total deflection | Feed (mm/ time) | Number of oscillations (inferior/minute) |
| ??110 | ??20 | ??70 | |||||
| ??1 | ??88 | ??18 | ??LG120 | ??53 | ??30.00％ | ??4 | ??45 |
| ??2 | ??75 | ??16.5 | ??LG90 | ??46 | ??23.39％ | ??5 | ??50 |
| ??3 | ??60 | ??13.5 | ??LG55 | ??33 | ??34.97％ | ??4 | ??60 |
| ??4 | ??47.5 | ??12.5 | ??LG55 | ??22.5 | ??30.31％ | ??2 | ??50 |
Table 11 embodiment 4 rolling technological parameters
| The processing passage | External diameter | Wall thickness | Processing units | Internal diameter | The accumulative total deflection | Feed (mm/ time) | Number of oscillations (inferior/minute) |
| ??110 | ??20 | ??70 | |||||
| ??1 | ??90 | ??18.5 | ??LG120 | ??53 | ??26.51％ | ??4 | ??50 |
| ??2 | ??78 | ??16 | ??LG90 | ??46 | ??25.00％ | ??5 | ??45 |
| ??3 | ??57 | ??14 | ??LG55 | ??33 | ??39.31％ | ??5 | ??50 |
| ??4 | ??47.5 | ??12.5 | ??LG55 | ??22.5 | ??27.33％ | ??3 | ??45 |
Table 12 embodiment 5 rolling technological parameters
| The processing passage | External diameter | Wall thickness | Processing units | Internal diameter | The accumulative total deflection | Feed (mm/ time) | Number of oscillations (inferior/minute) |
| ??110 | ??20 | ??70 | |||||
| ??1 | ??90 | ??18 | ??LG120 | ??53 | ??28.00％ | ??4 | ??60 |
| ??2 | ??76 | ??16 | ??LG90 | ??46 | ??25.93％ | ??5 | ??50 |
| ??3 | ??60 | ??14 | ??LG55 | ??33 | ??32.92％ | ??4 | ??60 |
| ??4 | ??47.5 | ??12.5 | ??LG55 | ??22.5 | ??32.07％ | ??3 | ??45 |
Table 13 finished product tubing tolerance of dimension
Table 14 finished product tubing surfaceness (μ m)
---the thermal treatment of finished product:
Adopt the tubular type protective atmosphere heat treatment furnace of Nuclear power plants command bundle rods for nuclear reactors drive mechanism bar with 1Cr13 thick-wall tube finished product thermal treatment special use; thermal treatment process according to table 15 is carried out finished product thermal treatment, equal controlled chilling speed＜500 ℃/h when wherein air cooling is cooled off.The mechanical property of 5 batches of finished product tubing of gained is shown in table 16.
Table 15 thermal treatment process
| Embodiment | Thermal treatment process |
| ??1 | 1000 ℃ * 2 hours, air cooling+650 ℃ * 4 hours, air cooling |
| ??2 | 1000 ℃ * 2 hours, air cooling+700 ℃ * 4 hours, air cooling |
| ??3 | 1050 ℃ * 1 hour, air cooling+680 ℃ * 5 hours, air cooling |
| ??4 | 1050 ℃ * 1 hour, air cooling+700 ℃ * 5 hours, air cooling |
| ??5 | 1020 ℃ * 2 hours, air cooling+650 ℃ * 3 hours, air cooling |
The mechanical property of table 16 finished product tubing
Embodiment 1～5 gained tube surfaces quality is seen Fig. 1～5 respectively, and the metallograph of embodiment 1 gained tubing is seen Fig. 6.
Comparative example 1
The smelting of alloy:
99% chromium metal add-on is 12.6% of a batch, the add-on of 99.9% electrolytic nickel is 0.46% of a batch, the add-on of 97% manganese metal is that the add-on of 0.58%, 99% Pure Silicon Metal of batch is 0.38% of a batch, and purity is 98% pure iron surplus.
The induction smelting technology: 1/3 rated output heating 45 minutes, 3/4 appraises and decides power heating 160 minutes.Be warming up to 1550 ℃ ± 10 ℃, be incubated 15 minutes.
Electroslag remelting process: quantity of slag 75Kg, electric current 12050A, voltage 58V.
Other technology is with embodiment 1, and the O of gained tubing, P content overproof do not meet nuclear power 1Cr13 stainless steel chemical component requirement.
Comparative example 2
The preparation of pipe: the hot piercing complete processing is 850 ℃ of low-temperature zone temperature, and soaking 90 minutes is heated to 1080 ℃ with 5 ℃/minute speed then, is incubated 15 minutes.
Other technology is with embodiment 1, because the high temperature section Heating temperature is lower than the process stipulation temperature, the termination cracking is seen Fig. 7 when causing poling.
Comparative example 3
Cold machining process: every time cold-rolling equipment and processing parameter control are shown in table 17.
Other technology is with embodiment 1, because the accumulative total pass deformation surpasses 40%, the maximum feed of cold reducing mill surpasses 5mm/ time, and head full swing number of times surpasses 60 times/minute, causes rolling tubing termination, back cracking at last, sees Fig. 8.
Table 17 comparative example 3 rolling technological parameters
| The processing passage | External diameter | Wall thickness | Processing units | Internal diameter | The accumulative total deflection | Feed (mm/ time) | Number of oscillations (inferior/minute) |
| ??110 | ??20 | ??70 | |||||
| ??1 | ??88 | ??18 | ??LG120 | ??53 | ??30.00％ | ??8 | ??70 |
| ??2 | ??65 | ??15 | ??LG90 | ??46 | ??40.48％ | ??5 | ??70 |
| ??3 | ??47 | ??12.5 | ??LG55 | ??33 | ??42.50％ | ??6 | ??80 |
Comparative example 4
Thermal treatment process: 930 ℃ * 2h+550 ℃ * 4h, air cooling, speed of cooling＜500 ℃/h.
Other technology is with embodiment 1, and the mechanical property of gained finished product tubing is shown in table 18, and the metallograph of gained tubing is seen Fig. 9.。
Table 18 finished product mechanical properties of tubular goods
| The tubing numbering | ??σ 0.2，MPa | σ b，MPa | ??δ5，％ | ??ψ，％ | ??α KV，J/cm 2 | Hardness (HB) |
| ??1 | ??490 | 700 | ??23.0 | ??64.0 | ??23 | ??95 |
| ??2 | ??485 | 700 | ??22.0 | ??62.5 | ??25 | ??94 |
Claims (1)
1. the preparation of 1 Cr (Chromium) 13 thick wall tubular products of control rod of nuclear reactor control bar drive mechanism is characterized in that:
---the stainless smelting of 1Cr13: adopt the method for induction furnace smelting+esr to smelt, wherein:
The induction furnace smelting technology:
Melting period: adopt the induction smelting furnace to smelt, furnace charge is 85.25～86.85% shove charge capacity, the pure iron of purity 〉=98%, the electrolytic nickel of the Metal Cr of 12～13% shove charge capacity and 0.4～0.50% shove charge capacity; Use 1/4～1/2 of full power to send electrically heated 30～60 minutes, after the incipient melting molten steel occurring, furnace charge is complete when red, uses 2/3～1 fusing of full power clear until whole furnace charges fusings;
Refining period: be warming up to 1550 ℃ ± 10 ℃, be incubated 15 ± 5 minutes;
The alloying phase: after finishing refining period, having a power failure makes molten steel temperature reduce to surperficial conjunctiva; Send electricity with the conjunctiva fusing then, again according to the metal M n of order of addition(of ingredients) with 0.50～0.75% shove charge capacity, the metal Si of 0.25～0.5% shove charge capacity adds in the molten steel;
Electroslag remelting process:
Prepare before smelting:
Electrode: adopt cast electrode bar or forging to form the esr electrode bar, electrode size is 3 * 100mm steel ingots, and the water-cooled copper crystallizer: the crystallizer diameter is 500mm;
Slag system: ternary slag CaF
2: Al
2O
3: MgO
2=30%: 65%: 5%, use preceding 600 ℃ of bakings 4 hours;
Base plate: copper coin or iron plate; Heelpiece: 1Cr13 sheet; Striking agent: solid conduction striking, striking agent composition: CaF
2: TiO
2=50%: 50%;
The electroslag remelting process parameter:
Quantity of slag A:A=1/4 π D
2H γ, D are the crystallizer diameter, and depth of slag bath h is 1/3～1/2 of a crystallizer diameter, and the density of slag is at 2400～2500Kg/m
3
Working current I:I=SJ, S are the area of section of consumable electrode, the mm of unit
2, J is a current density, the A/mm of unit
2, J=56/d
Electrode-0.05, d
ElectrodeBe electrode diameter, the cm of unit;
Smelt voltage U: U=0.5d
Electrode+ B, B are 27～37V;
---the preparation method of pipe:
Rod base processing: will smelt that the 1Cr13 steel of gained obtains after forging
The rod base,
After cutting, strip off the skin, the excellent base outside dimension after stripping off the skin is 105mm, nonstraightness is less than 1.0mm/m, surfaceness≤Ra6.4;
Heating process: gained rod base cold charge is gone into stove,, be heated to 1100～1180 ℃ with speed then, be incubated 15～30 minutes greater than 2 ℃/minute 650～850 ℃ of following soaking of low-temperature zone temperature 90～120 minutes;
Perforating head: molybdenum base alloy top; Lubricant: glass powder;
Cooling: the perforation postcooling, control its speed of cooling and be cooled to room temperature less than 100 ℃/hour;
---the cold machine-shaping of tubing: control passage cumulative deformation is 25～40%, and the cold reducing mill feed is 2～5mm/ time, and the head number of oscillations is 30～60 times/minute;
---the thermal treatment process of finished product: place tubular type protective atmosphere heat treatment furnace to heat-treat with 1Cr13 thick-wall tube finished product on Nuclear power plants command bundle rods for nuclear reactors drive mechanism bar, processing parameter is: be incubated 1～2 hour down at 1000～1050 ℃, air cooling is cooled to room temperature, controlled chilling speed＜500 ℃/h; 650～700 ℃ of down insulations 3～5 hours, air cooling is cooled to room temperature, controlled chilling speed＜500 ℃/h;
Wherein % all is weight percentage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101518202A CN101812624B (en) | 2010-04-21 | 2010-04-21 | Preparation of 1 Cr (Chromium) 13 thick wall tubular products of control rod of nuclear reactor control bar drive mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101518202A CN101812624B (en) | 2010-04-21 | 2010-04-21 | Preparation of 1 Cr (Chromium) 13 thick wall tubular products of control rod of nuclear reactor control bar drive mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101812624A true CN101812624A (en) | 2010-08-25 |
| CN101812624B CN101812624B (en) | 2012-01-25 |
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|---|---|---|---|
| CN2010101518202A Expired - Fee Related CN101812624B (en) | 2010-04-21 | 2010-04-21 | Preparation of 1 Cr (Chromium) 13 thick wall tubular products of control rod of nuclear reactor control bar drive mechanism |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103789684A (en) * | 2014-01-26 | 2014-05-14 | 中广核工程有限公司 | Driving rod of driving mechanism of nuclear power station control rod and preparation method thereof |
| CN103820728A (en) * | 2014-02-24 | 2014-05-28 | 中广核工程有限公司 | Nuclear power station control rod drive mechanism's detachable joint and its preparation method |
| CN105200346A (en) * | 2015-09-22 | 2015-12-30 | 江苏新核合金科技有限公司 | 12Cr13 bar used for evaporator pull rods and pull rod nuts |
| CN105567939A (en) * | 2015-12-23 | 2016-05-11 | 连云港珍珠河石化管件有限公司 | Production method of high-temperature high-nickel alloy seamless pipe |
| CN103820728B (en) * | 2014-02-24 | 2016-11-30 | 中广核工程有限公司 | Nuclear power station CRDM detachable fitting and preparation method thereof |
| CN109439874A (en) * | 2018-11-02 | 2019-03-08 | 中国原子能科学研究院 | A kind of preparation process of the seamless heat exchanger tube for sodium-cooled fast reactor Intermediate Heat Exchanger |
| CN110116143A (en) * | 2019-04-29 | 2019-08-13 | 浙江久立特材科技股份有限公司 | A kind of small-bore thick-wall seamless of hot extrusion molding |
| CN113025796A (en) * | 2021-03-04 | 2021-06-25 | 上海核工程研究设计院有限公司 | Preparation method of small-diameter thick-wall pipe of control rod driving mechanism driving rod of nuclear power station |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103789684A (en) * | 2014-01-26 | 2014-05-14 | 中广核工程有限公司 | Driving rod of driving mechanism of nuclear power station control rod and preparation method thereof |
| CN103820728A (en) * | 2014-02-24 | 2014-05-28 | 中广核工程有限公司 | Nuclear power station control rod drive mechanism's detachable joint and its preparation method |
| CN103820728B (en) * | 2014-02-24 | 2016-11-30 | 中广核工程有限公司 | Nuclear power station CRDM detachable fitting and preparation method thereof |
| CN105200346A (en) * | 2015-09-22 | 2015-12-30 | 江苏新核合金科技有限公司 | 12Cr13 bar used for evaporator pull rods and pull rod nuts |
| CN105567939A (en) * | 2015-12-23 | 2016-05-11 | 连云港珍珠河石化管件有限公司 | Production method of high-temperature high-nickel alloy seamless pipe |
| CN109439874A (en) * | 2018-11-02 | 2019-03-08 | 中国原子能科学研究院 | A kind of preparation process of the seamless heat exchanger tube for sodium-cooled fast reactor Intermediate Heat Exchanger |
| CN109439874B (en) * | 2018-11-02 | 2020-10-09 | 中国原子能科学研究院 | Preparation process of seamless heat exchange tube for sodium-cooled fast reactor intermediate heat exchanger |
| CN110116143A (en) * | 2019-04-29 | 2019-08-13 | 浙江久立特材科技股份有限公司 | A kind of small-bore thick-wall seamless of hot extrusion molding |
| CN113025796A (en) * | 2021-03-04 | 2021-06-25 | 上海核工程研究设计院有限公司 | Preparation method of small-diameter thick-wall pipe of control rod driving mechanism driving rod of nuclear power station |
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|---|---|
| CN101812624B (en) | 2012-01-25 |
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