CN104607464A - Rolling method of large-width ultrathin molybdenum plate strip for high-temperature heat insulation screen - Google Patents
Rolling method of large-width ultrathin molybdenum plate strip for high-temperature heat insulation screen Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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Abstract
The invention discloses a rolling method of a large-width ultrathin molybdenum plate strip for a high-temperature heat insulation screen. The method includes the following steps that firstly, a powder metallurgy sintered lanthanum-containing molybdenum plate blank is fetched, subjected to four-heating and four-pass hot rolling and then subjected to air cooling and alkali cleaning, so that a molybdenum plate A is obtained; secondly, the molybdenum plate A is fetched, heated, subjected to five-heating rolling and then subjected to annealing treatment, so that a molybdenum plate B is obtained; thirdly, the molybdenum plate B is fetched, subjected to seven-pass cold rolling and then subjected to annealing treatment, so that a molybdenum plate C is obtained; fourthly, the molybdenum plate C is rolled and then flattened, so that the molybdenum plate strip is obtained. According to the method, the finished molybdenum plate has a large specification, few coarse grains, small grain clearances, uniform compactness and a high rate of finished products; use performance and surface quality are high, and engineering quality and engineering efficiency of the molybdenum plate strip are improved when the molybdenum plate strip is used for heat insulation materials of high-temperature furnaces, high-temperature heating bodies and package materials of nuclear reactors.
Description
Technical field
The invention belongs to molybdenum plate rolling technical field, be specifically related to the milling method of the ultra-thin molybdenum plate band of a kind of high temperature insulating screen wide cut.
Background technology
Along with the development of modern industry, the molybdenum board material demand with excellent resistance to elevated temperatures sharply increases.Molybdenum board material may be used for the sheath material etc. of high temperature insulating plate, high-temperature furnace heating body, nuclear reactor.The molybdenum plate band that ultra-wide overlength is ultra-thin, can reduce and connect gap welding, improve heat insulation protection quality, promote operating efficiency, reduce molybdenum plate material consumption.This large gauge high-quality molybdenum plate band is developed has become the molybdenum product having competition potential.
High temperature insulating plate molybdenum plate band, require that molybdenum plate not only wants plasticity good, intensity is high, anisotropy is little, and dimensional accuracy wants high, plate shape will be got well and surface quality wants high.In order to ensure the good result of molybdenum plate, molybdenum plate is proposed to the requirement of various rationalization performance: the molybdenum plate surface defect such as flawless, peeling, burr, the good and strict controlling dimension tolerance of molybdenum plate homogeneity, tensile strength and percentage elongation should control within the specific limits.
At present, along with domestic and international market improves constantly ultra-wide overlength ultra-thin rolling molybdenum strip added value of product, demand progressively increases, and domestic molybdenum deep processing enterprise also increases to be studied the rolling of this novel Mo strip.But the actual production of domestic molybdenum plate band processing enterprise is started late, and rolling technique is delayed, and production technology is left to be desired.Molybdenum plate bandwidth curtailment out, thickness made by prior art are too large, density is uneven, surface flatness is poor, it is high to roll useless rate.These problems have had a strong impact on the serviceability of molybdenum plate band, govern the expansion in the extension product field of material based on molybdenum plate band.For the molybdenum plate band of high temperature insulating screen, high-temperature furnace heating body, nuclear reactor sheath material on market, short of width 800mm, curtailment 3m, more than thickness 2mm, and could not through smooth, molybdenum plate belt surface quality and glacing flatness lower.Molybdenum plate bandwidth curtailment, thickness are too large, density is uneven, surface flatness is poor, has had a strong impact on the engineer applied in high temperature insulating body, high-temperature furnace heating body, nuclear reactor sheath material.
Summary of the invention
The object of this invention is to provide the milling method of the ultra-thin molybdenum plate band of a kind of high temperature insulating screen wide cut, solve molybdenum plate bandwidth curtailment prepared by prior art, thickness is too large, density is uneven, surface flatness is poor, roll the high problem of useless rate.
In order to realize above object, the technical solution adopted in the present invention is:
A milling method for the ultra-thin molybdenum plate band of high temperature insulating screen wide cut, comprises the following steps:
1) hot rolling: get powder metallurgy sintered containing lanthanum molybdenum plate blank, four fire time four-pass hot rollings are carried out with the mill speed of 38 ~ 42m/min, the heating-up temperature of the first passage hot rolling is 1495 ~ 1505 DEG C, second, third, the heating-up temperature of four-pass hot rolling is 1445 ~ 1455 DEG C, air cooling after four-pass hot rolling, alkali cleaning, obtains molybdenum plate A;
2) warm-rolling: get step 1) gained molybdenum plate A, be heated to 1095 ~ 1105 DEG C, carry out five fire time rollings with the mill speed of 42 ~ 46m/min, by annealing in process, obtain molybdenum plate B;
3) cold rolling: to get step 2) gained molybdenum plate B, carries out seven passages with the mill speed of 58 ~ 62m/min cold rolling, by annealing in process, obtains molybdenum plate C;
4) smooth: by step 3) after gained molybdenum plate C is rolled with the mill speed of 58 ~ 62m/min, carries out smooth, obtain described molybdenum plate band.
Step 1) in, described powder metallurgy sintered molybdenum plate blank comprises the component of following mass percent: La0.324%, Si0.003%, Ca0.002%, Mg0.002%, P0.001%, C0.02%, O0.003%, N0.003%, and surplus is Mo.
Step 1) in, described molybdenum plate blank had carried out pre-treatment before hot rolling, and described pre-treatment is by molybdenum plate blank in a hydrogen atmosphere, was heated to 895 ~ 905 DEG C and was incubated 0.9 ~ 1.1h; Be heated to 1195 ~ 1205 DEG C again and be incubated 0.9 ~ 1.1h; Then 1595 ~ 1605 DEG C are heated to and after being incubated 0.9 ~ 1.1h, air cooling, for subsequent use.
In described four fire time four-pass hot rollings, before every time hot rolling, need to heat molybdenum plate blank.
Step 1) in, in described four fire time four-pass course of hot rolling, before the first passage hot rolling, molybdenum plate blank be heated to 1495 ~ 1505 DEG C in a hydrogen atmosphere and start rolling after being incubated 19 ~ 21min; Second, third, molybdenum plate blank be heated in a hydrogen atmosphere 1445 ~ 1455 DEG C respectively before four-pass hot rolling and start rolling after being incubated 49 ~ 51min.
In described course of hot rolling, before molybdenum plate blank enters roll, first by molybdenum plate blank steel brush or grinder buffing, dispose the oxide skin on molybdenum plate blank surface.Molybdenum plate blank, within 2min, after cleaning out, is pushed roll rapidly by described polishing time controling.
Step 1) in, described four fire time four-pass hot rollings are for intersecting hot rolling, and described intersection hot rolling refers to that the first, the 3rd passage hot rolling is along parallel direction rolling, and second, four-pass vertically tandem rolling.
Step 1) in, in described four fire time four-pass course of hot rolling, the deformation rate of the first passage hot rolling is 30% ~ 32%; Second, third, the deformation rate of four-pass hot rolling is 35% ~ 38%.
Step 1) in, described alkali cleaning cleans molybdenum plate in molten state alkali.With water punching after alkali cleaning, with grinder buffing oxide skin and crackle.
The alkali of described alkali cleaning is NaOH.
After described four fire time four-pass hot rollings, to step 1) head of gained molybdenum plate A carries out shear treatment.Shear treatment can control peeling layering effectively, to obtain good surface quality.
Step 2) in, before described five fire time rollings, molybdenum plate A is heated to 1095 ~ 1105 DEG C in a hydrogen atmosphere and carries out preheating, preheating time is 19 ~ 21min.
Step 2) in, in the described five fire time operations of rolling, often heat once, rolling pass is no more than 2 passages; The thickness of every time rolling pressure accounts for 25% ~ 30% of the front gross thickness of pressure.
In warm-rolling process, processing drafts will control moderate, and pass deformation is unsuitable too small, is generally greater than 25%; But because warm-rolling molybdenum plate band heating-up temperature is restricted, heat a total deformation unsuitable excessive, generally not higher than 30%.
Step 2) in, described five fire time rollings are tandem rolling.
Step 2) in, described annealing in process molybdenum plate is heated to 895 ~ 905 DEG C and after being incubated 59 ~ 61min, air cooling; Step 3) in, described annealing in process molybdenum plate is heated to 945 ~ 955 DEG C and after being incubated 39 ~ 41min, air cooling.
Step 3) in, in described seven passage cold-rolled process, the thickness of every time rolling pressure accounts for 20% ~ 22% of the front gross thickness of pressure.
Step 3) in, described cold rolling for tandem rolling.
Step 3) describedly cold rollingly to carry out at ambient temperature.
After described cold rolling end, to step 3) gained molybdenum plate C carries out alkali cleaning.Described alkali cleaning is cleaned molybdenum plate by molten state.The alkali of described alkali cleaning is NaOH.
Step 4) in, the deformation rate of described rolling is 0.99% ~ 1.01%.
Step 4) in, described smooth speed is less than 60m/min.Control the appearance that smooth speed can reduce vibration line.
The backing roll of described smooth planisher is plain-barreled roll, and cylindricity is 0.01mm; The cylindricity of working roll is 0.005mm, and roughness is 0.2; In top roll, height is 0.004mm, and lower roll is plain-barreled roll, and two roller diameter deviations are 0.01mm.
The purging system of planisher inlet location, adopts water content and impurity to lack to obtain instrument supply gas, reduces the dirt of molybdenum plate belt surface.
By to production and processing monitoring, control the roll change cycle; Roll rolling time is long, the serious uneven wear of roll surface, and roll crown reduces too many, may cause flatness defect.
The milling method of the ultra-thin molybdenum plate band of described high temperature insulating screen wide cut also comprises step 4) gained molybdenum plate band cleans; Described cleaning molybdenum plate band is placed in NaOH solution carry out ultrasonic cleaning.
In described NaOH solution, the mass concentration of NaOH is 5% ~ 7%.
Described cleaning equipment is molybdenum plate band ultrasonic cleaning production line, and concrete structure is see patent CN203900029U, CN203900123U, CN203900020U and CN203900021.
Described cleaning molybdenum plate band is placed in NaOH solution carry out ultrasonic cleaning, by prebake, the effect of S roller tension force, hot-air seasoning, to obtain final product.
In the milling method of the ultra-thin molybdenum plate band of high temperature insulating screen wide cut of the present invention, the optimum choice of each controlled condition is as follows:
Step 1) in, the selection of material is powder metallurgy sintered containing lanthanum molybdenum plate blank, and slab middle rare earth La content is 0.324%.Containing rare earth La in molybdenum slope base, molybdenum plate blank grain size in sintering and reducing process can be made to diminish, improve the density of sintering molybdenum slope base.And along with the increase of La content, the molybdenum plate blank degree of grain refinement of sintering is further obvious; On the other hand, in molybdenum plate blank, contained rare earth La amount is too high, and molybdenum plate resistance of deformation in process will be made to strengthen, and plasticity reduces.Production practices show, in molybdenum plate blank La containing for 0.324% time, can instructions for use be met, significantly can not affect again the processing characteristics of molybdenum plate.
Step 1) in, described molybdenum plate blank had carried out pre-treatment before hot rolling, was heated to 895 ~ 905 DEG C by molybdenum plate blank and was incubated 0.9 ~ 1.1h having under hydrogen shield atmosphere; Be heated to 1195 ~ 1205 DEG C again and be incubated 0.9 ~ 1.1h; Then be heated to 1595 ~ 1605 DEG C and be incubated 0.9 ~ 1.1h.The effect of pre-treatment is: because molybdenum is easily oxidized water suction, can contain a small amount of oxygen, and surface is covered with oxide etc. in molybdenum plate blank material; If do not removed, the form with gas is closed in closed pore by oxygen, thus has a negative impact to the quality of sinter.Molybdenum plate blank is heated to 895 ~ 905 DEG C, insulation 0.9 ~ 1.1h, can improve greatly molybdenum plate blank quality, improve follow-up rolling molybdenum strip yield rate; Be heated to 1195 ~ 1205 DEG C, insulation 0.9 ~ 1.1h, makes the impurity of low melting point volatilize; Be heated to 1595 ~ 1605 DEG C, insulation 0.9 ~ 1.1h, makes relative high-melting-point impurity volatilize.
Step 1) in, molybdenum plate blank is heated to 1495 ~ 1505 DEG C having under hydrogen shield atmosphere, after insulation 19 ~ 21min, carries out split rolling method.Select rational cogging temperature, the resistance of deformation of cogging process can be reduced, improve rolling quality and the yield rate of molybdenum plate band.Cogging temperature is chosen can not be too high, when temperature is too high, not only makes coarse grains in molybdenum base, strengthens electric energy loss, and also have negative effect to the structure property of finished product molybdenum plate band.Cogging temperature is chosen can not be too low, and when temperature is too low, under the effect of large cogging drafts, then molybdenum base easily ftractures, ruptures.Add the molybdenum plate blank of the La of 0.324%, compared with pure molybdenum plate blank, resistance of deformation increases, and plasticity is deteriorated to some extent.Pure molybdenum plate blank breakdown rolling temperaure is generally 1400 DEG C ~ 1420 DEG C; Cogging temperature containing the molybdenum plate blank of La elects 1495 ~ 1505 DEG C as, and molybdenum base scraps phenomenon without cracking.
Step 1) in, in the hot rolling, first pass deformation rate adopts the aximal deformation value of 30% ~ 32%, and later pass deformation rate is 35% ~ 38%.Large deflection can make molybdenum plate blank internal modification even, makes it in processing subsequently, is unlikely to produce layering, roll defects such as splitting, and the gap grating such as closed pore, pore in molybdenum base also can be made to close.
Step 1) in, in the hot rolling, before molybdenum plate blank enters roll, first by molybdenum plate blank grinder buffing, dispose the oxide skin on molybdenum plate blank surface.This process time can not be long, should control within 2min.After cleaning out, rapidly molybdenum plate blank is pushed roll.Molybdenum plate blank is easy to oxidized in atmosphere, and the oxide of molybdenum can be pressed into the surface quality and subsequent rolling process that affect molybdenum plate band in molybdenum plate band, also can reduce the frictional force of molybdenum plate blank, produces skid when molybdenum board rolling is nipped.
Step 1) in, in the hot rolling, carry out four fire time four-pass cogging hot rollings altogether.After every time hot rolling terminates, also to heat the molybdenum plate blank of cooling.Rear three passage heating-up temperatures are lower than the first passage 50 DEG C, are set as 1445 ~ 1455 DEG C, temperature retention time 50min.The pyroconductivity of molybdenum plate is very high, puts and can cool rapidly in atmosphere, cannot realize the insulation of molybdenum plate band, after thus every time rolling terminates, all will heat the molybdenum plate blank of cooling.The heating-up temperature of hot rolling is higher than the recrystallization temperature of molybdenum ribbon, and the hot-rolled temperature adding La molybdenum plate band should higher than the heating-up temperature of pure molybdenum plate band, so when cogging hot rolling, after setting, three passage heating-up temperatures are 1445 ~ 1455 DEG C.Temperature retention time 49 ~ 51min, can realize the homogenizing annealing of molybdenum plate band.
Step 1) in, in the hot rolling, the first passage, the 3rd passage along parallel direction rolling, the second passage, four-pass vertically tandem rolling.During rolling molybdenum plate, by the mode of the rolling that commutates, the anisotropy of molybdenum plate can be reduced, improve the performance of molybdenum plate.
Step 1) in, in the hot rolling, keep mill speed 38 ~ 42m/min.When mill speed is lower, in the operation of rolling, between roll and slab, there will be skidding.In addition, mill speed is lower, and molybdenum plate blank cooling rate is fast, oxidation aggravation.
Step 1) in, in the hot rolling, the 4th rolling terminates rear air cooling, in molten state alkali pond, clean molybdenum plate, Hou Shuichong, with grinder buffing oxide skin and crackle.By this technique, improve molybdenum plate belt surface cleannes, warm-rolling molybdenum plate band quality can be improved.
Step 1) gained molybdenum plate A before warm-rolling, shear treatment is carried out to the head of the molybdenum plate after hot rolling.By this technique, effectively can control the layering of molybdenum plate peeling, obtain good surface quality.
Step 2) in, the heating-up temperature of described warm-rolling is 1095 ~ 1105 DEG C, preheating 19 ~ 21min before rolling.Heating-up temperature selects 1095 ~ 1105 DEG C, effectively can reduce the resistance of deformation of molybdenum plate, prevents molybdenum plate crystal grain from becoming large.Preheating 19 ~ 21min, molybdenum plate blank homogeneous temperature, eliminates rolling stress simultaneously, avoids the generation of micro-crack.
Step 2) in, in warm-rolling process, the thickness of every time rolling pressure accounts for 25% ~ 30% of the front gross thickness of pressure.In warm-rolling process, processing drafts will control moderate, and pass deformation is unsuitable too small, is generally greater than 25%; But because warm-rolling molybdenum plate band heating-up temperature is restricted, heat a total deformation unsuitable excessive, generally not higher than 30%.Once, rolling pass is no more than secondary in heating.
Step 2) in, the molybdenum plate after rolling is heated to 895 ~ 905 DEG C of annealing, air cooling after retention time 59 ~ 61min.By scanning electron microscope analysis, interlaced between molybdenum plate crystal grain, arrange compact, this illustrate 895 ~ 905 DEG C annealing after, the horizontal and vertical combination property of molybdenum plate is all good.
After warm-rolling terminates before cold rolling beginning, with preparation to step 2) gained molybdenum plate band B cleans.Molybdenum plate band is in high temperature rolling process, and plate surface oxide layer is by pollutants such as volatile for uneven adhesion low melting point molybdenum trioxides.If continue processing, in the impurity press-in plate surface layer polluted making these, form the pockmark white point on molybdenum plate surface.In addition, some microcracks that molybdenum plate surface occurs when rolling, also wash down by preparation erosion and remove.
Step 3) in, in cold-rolled process, on-line heating is not carried out to molybdenum plate band.Because molybdenum plate tape thickness is too little, be not easily incubated, and along with the increase of deflection, the crisp transition temperature of moulding of molybdenum plate band drops to below room temperature, do not need heating.Meanwhile, in order to obtain the molybdenum plate band crystalline structure with premium properties, also need to use cold rolling.
Step 3) in, in cold-rolled process, the thickness of every time rolling pressure accounts for 20% ~ 22% of the front gross thickness of pressure.In cold-rolled process, processing drafts will control moderate, and pass deformation is unsuitable excessive, is generally less than 25%.According to production practices, find that at deflection be 20% ~ 22%, molybdenum plate band splits phenomenon without rolling.When deflection is greater than 25%, molybdenum plate occurs with rolling situation of splitting.
Step 3) in, the molybdenum plate after rolling is heated to 945 ~ 955 DEG C of annealing, air cooling after retention time 39 ~ 41min.When cold rolling, molybdenum plate band can produce serious distortional stress, and roll-force is increased, and distortion difficulty, molybdenum plate band easily ruptures, and percent defective increases.Find in production practices, molybdenum plate is heated to 945 ~ 955 DEG C, and retention time 39 ~ 41min anneals, can to playing the effect well eliminating work hardening containing La molybdenum plate.
After cold rolling end before smooth beginning, with preparation to step 3) gained molybdenum plate C cleans.Molybdenum plate band is in the operation of rolling, and plate surface oxide layer is by pollutants such as volatile for uneven adhesion low melting point molybdenum trioxides.If continue processing, in the impurity press-in plate surface layer polluted making these, form the pockmark white point on molybdenum plate surface.In addition, some microcracks that molybdenum plate surface occurs when rolling, also wash down by preparation erosion and remove.
Step 3) in, in cold-rolled process, mill speed controls at 58 ~ 62m/min.In cold-rolled process, according to various factors during rolling to the quality influence degree of strip, mill speed controls at 58 ~ 62m/min, effectively can reduce the resistance of deformation of molybdenum plate, prevents molybdenum plate crystal grain from becoming large.
Step 4) in, mill speed 58 ~ 62m/min, deformation rate is 0.99% ~ 1.01%.This is in formation process, according to various factors during rolling to the influence degree of plate shape, carries out effective control method to molybdenum flatness defect.
Step 4) in, in formation process, by improving the purging system of planisher inlet location, increase by row's nozzle, the angle between nozzle blowing direction and molybdenum plate is 145 degree.Purging wind speed and air quantity by strengthening, purging the dirt of molybdenum plate belt surface.Adopt water content and the few instrument supply gas of impurity, reduce the dirt of molybdenum plate belt surface.Molybdenum plate belt surface cleannes improve more than 90%, and any water stain and spot has been can't see in range estimation.
Step 4) in, in formation process, the smooth speed controlling planisher is less than 60m/min, planisher is produced and controls in velocity interval from exciting phenomenon, can effectively level of control vibrate, and prevents molybdenum plate from occurring rolling vibration line.
Step 4) in, in formation process, by production and processing monitoring, control the roll change cycle.By production monitoring and processing statistics, analyze processing statistics data, the universal law sexual cycle of roll change can be obtained, the generation of the line of prevention molybdenum plate skin pass rolling vibration ahead of time.If in process, once vibration sign appears in roller, or there is vibration line in molybdenum plate surface, should roll change immediately.
Clean, in cleaning process, by the reasonable distribution of tension section after smooth, increase the measures such as height roller, make molybdenum plate band have certain cornerite on each roller, horizontal tension increases, and better solves the phenomenons such as the wrinkling backfin of molybdenum plate band on production equipment.According to foil cleaning characteristics at the bottom of still, when passing in and out drying baker, respectively setting up a pair S rod, making the tension adjustment of sliver more reasonable, both having ensured cleaning, drying requirement, after having ensured again cleaning, molybdenum plate band tightly wraps neat requirement.
In cleaning process, on molybdenum strip line, in cleaning by degreasing groove, service property (quality) concentration is the NaOH solution of 5% ~ 7%, increase upper and lower a pair ultrasonic oscillator pole, adopt up and down apart from adjustable (150mm), oscillation power is adjustable, improves the surface cleanness degree of molybdenum plate band in order to surface.
In cleaning process, increasing 20KW high-pressure hot wind prebake system, adopting upper and lower certain angle to blowing, outlet temperature 70 ~ 90 DEG C, air outlet and foil direct of travel reverse, angle 60 ~ 70 degree, rotation speed of fan 2900rpm, power of fan 11KW, air quantity 8936Pa, air quantity 3619m
3/ h.Be used in before molybdenum plate band enters S roller, the residual and prebake effect to the water of strip surface.Finally eliminate the adhesion of band at S roller, wrinkling reduces more than 95%, and backfin phenomenon reduces more than 98%.
The milling method of the ultra-thin molybdenum plate band of high temperature insulating screen wide cut of the present invention, with the powder metallurgy sintered lanthanum molybdenum plate blank that contains for raw material, carry out hot rolling, warm-rolling, cold rolling, flattening process successively, gained finished product molybdenum plate specification is large, width reaches 1100mm, thickness can be less than 0.4mm, and thickness deviation is within ± 1%, and length can reach 25000mm; Coarse grain is less, crystal grain gap is little, density is even, field trash is less, yield rate is high, and other defect also seldom occurs; Gained molybdenum plate band finished product serviceability and surface quality higher, meet the instructions for use that molybdenum plate band shields as high temperature insulating, drastically increase molybdenum plate band for construction quality when high temperature furnace heat-barrier material, high-temperature heating body and nuclear reactor sheath material and engineering efficiency.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is further illustrated.
Embodiment 1
The milling method of the ultra-thin molybdenum plate band of high temperature insulating screen wide cut of the present embodiment, comprises the following steps:
1) hot rolling:
Get powder metallurgy sintered containing lanthanum molybdenum plate blank, specification 57mm × 450mm × 450mm, density 9.6g/cm
3, substance 110kg, described powder metallurgy sintered molybdenum plate blank comprises the component of following mass percent: La0.324%, Si0.003%, Ca0.002%, Mg0.002%, P0.001%, C0.02%, O0.003%, N0.003%, and surplus is Mo.
Pre-treatment is carried out to molybdenum plate blank: molybdenum plate blank is put into 450kw Medium Frequency Induction Heating Furnace, be heated to 900 DEG C having under hydrogen shield atmosphere, insulation 1h; Be heated to 1200 DEG C again, insulation 1h; Then 1600 DEG C are heated to, insulation 1h, rear air cooling, for subsequent use;
Get the molybdenum plate blank after pre-treatment, put into 450kw Medium Frequency Induction Heating Furnace, be heated to 1500 DEG C having under hydrogen shield atmosphere, insulation 20min, is placed on ф 800mm × 1200mm bis-roller hot pack mill and carries out split rolling method; Before molybdenum plate blank enters roll, first molybdenum plate blank steel brush is polished, dispose the oxide skin on molybdenum plate blank surface; This process time controls within 2min, after cleaning out, rapidly molybdenum plate blank is pushed roll;
In split rolling method process, carry out four fire time four-pass cogging hot rollings altogether with the mill speed of 40m/min; After every time hot rolling terminates, also to heat the molybdenum plate blank of cooling; Rear three passage heating-up temperatures are lower than the first passage 50 DEG C, are set as 1450 DEG C, temperature retention time 50min;
In split rolling method process, the first passage, the 3rd passage along parallel direction rolling, the second passage, four-pass vertically tandem rolling; First pass deformation rate adopts the aximal deformation value of 30% ~ 32%, second, third, four-pass deformation rate is 35% ~ 38%; The thickness of the present embodiment is the molybdenum plate blank that 57 ± 0.2mm is thick, and drafts is as shown in table 1 below:
Every time pressure scale in table 1 embodiment 1 cogging course of hot rolling
| Passage | 1 | 2 | 3 | 4 |
| Supplied materials thickness (mm) | 57.00 | 39.33 | 24.78 | 15.61 |
| Finished product thickness (mm) | 39.33 | 24.78 | 15.61 | 10.00 |
| Absolute draft amount (%) | 17.67 | 14.55 | 9.17 | 5.61 |
| Relative reduction (%) | 31.00 | 37.00 | 37.00 | 35.94 |
| General working rate (%) before final pass | 0.00 | 31.00 | 56.53 | 71.56 |
| General working rate (%) after final pass | 31.00 | 56.53 | 72.61 | 82.46 |
In split rolling method process, keep mill speed 40m/min;
After four-pass rolling terminates, air cooling, cleans molybdenum plate in molten state alkali pond, and rear water punching, with grinder buffing oxide skin and crackle; Shear treatment is carried out to the head of gained molybdenum plate, effectively controls peeling layering, obtain good surface quality, obtain the molybdenum plate A of long 1100mm × wide 1000mm × thick 10mm;
2) warm-rolling:
Get step 1) gained molybdenum plate A, puts into 450kw Medium Frequency Induction Heating Furnace, is heated to 1100 DEG C having under hydrogen shield atmosphere, after preheating 20min, is placed in 1200mm 4-roller reversible cold rolling mill group, carry out 5 fire time warm-rollings with the mill speed of 44m/min;
In warm-rolling process, every fire heats once, rolling a time; The thickness of every time rolling pressure accounts for 25% ~ 30% of the front gross thickness of pressure; In warm-rolling process, processing drafts will control moderate, and pass deformation is unsuitable too small, is generally greater than 25%; But because warm-rolling molybdenum plate band heating-up temperature is restricted, heat a total deformation unsuitable excessive, generally not higher than 30%; The thickness of the present embodiment is the molybdenum plate blank that 10 ± 0.1mm is thick, and drafts is as shown in table 2 below:
Every time pressure scale in table 2 embodiment 1 warm-rolling process
| Passage | 1 | 2 | 3 | 4 | 5 |
| Supplied materials thickness (mm) | 10.00 | 7.40 | 5.33 | 3.84 | 2.76 |
| Finished product thickness (mm) | 7.40 | 5.33 | 3.84 | 2.76 | 2 |
| Absolute draft amount (%) | 2.60 | 2.07 | 1.49 | 1.08 | 0.76 |
| Relative reduction (%) | 26.00 | 28.00 | 28.00 | 28 | 27.54 |
| General working rate (%) before final pass | 0.00 | 26.00 | 46.70 | 61.60 | 72.40 |
| General working rate (%) after final pass | 26.00 | 46.70 | 61.60 | 72.40 | 80.00 |
In warm-rolling process, maintenance mill speed is 44m/min;
After 5th passes terminates, molybdenum plate is heated to 900 DEG C of annealing, air cooling after maintenance 60min; Gained molybdenum plate preparation is cleaned, obtains the molybdenum plate B of long 5000mm × wide 1100mm × thick 2mm;
3) cold rolling:
Get step 2) gained molybdenum plate B, at room temperature uses 1200mm 4-roller reversible cold rolling mill group, carries out seven passages cold rolling with the mill speed of 60m/min;
Described cold rolling for tandem rolling; In cold-rolled process, the thickness of every time pressure accounts for 20% ~ 22% of the front gross thickness of pressure; The thickness of the present embodiment is the molybdenum plate blank of 2 ± 0.1mm, and drafts is as shown in table 3 below:
Every time pressure scale in table 3 embodiment 1 cold-rolled process
| Passage | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Supplied materials thickness (mm) | 2.00 | 1.58 | 1.25 | 0.99 | 0.78 | 0.62 | 0.50 |
| Finished product thickness (mm) | 1.58 | 1.25 | 0.99 | 0.78 | 0.62 | 0.50 | 0.40 |
| Absolute draft amount (%) | 0.42 | 0.33 | 0.26 | 0.21 | 0.16 | 0.12 | 0.10 |
| Relative reduction (%) | 21.00 | 21.00 | 21.00 | 21.00 | 21.00 | 20.00 | 20.00 |
| General working rate (%) before final pass | 0.00 | 21.00 | 37.50 | 50.50 | 61.00 | 69.00 | 75.00 |
| General working rate (%) after final pass | 21.00 | 37.50 | 50.50 | 61.00 | 69.00 | 75.00 | 80.00 |
In cold-rolled process, mill speed controls at 60m/min;
After 7th passes terminates, the molybdenum plate after rolling is heated to 950 DEG C of annealing, air cooling after maintenance 40min; Gained molybdenum plate band preparation is cleaned, obtains the molybdenum plate C of long 25000mm × wide 1100mm × thick 0.4mm;
4) smooth:
By step 3) gained molybdenum plate C is rolled with the mill speed of 60m/min, and rolling deformation rate is 1%;
Molybdenum plate after rolling being placed in the reversible planisher of 1200mm tetra-roller carries out smooth; Before smooth, breaker roll carries out grinding, and backing roll is ground to plain-barreled roll, and cylindricity is 0.01mm; The cylindricity of working roll is 0.005mm, and roughness is 0.2; In top roll, height is 0.004mm, and lower roll is plain-barreled roll, and two roller diameter deviations are 0.01mm; Improve the purging system of planisher inlet location, increase by row's nozzle, the angle between nozzle blowing direction and molybdenum plate is 145 degree, adopts water content and the few instrument supply gas of impurity, reduces the dirt of molybdenum plate belt surface;
Time smooth, the smooth speed controlling planisher is 55m/min (being less than 60m/min), reduces the appearance of vibration line; By monitoring production and processing, control the roll change cycle, roll rolling time is long, the serious uneven wear of roll surface, and roll crown reduces too many, may cause flatness defect; After smooth end, obtain described molybdenum plate band.
Gained molybdenum plate band is placed in mass concentration be 5% NaOH solution carry out ultrasonic cleaning, by prebake, the effect of S roller tension force, hot-air seasoning, obtain the ultra-thin molybdenum plate band of described high temperature insulating screen wide cut.
In cleaning process, described prebake increases 20KW high-pressure hot wind prebake system, adopts upper and lower certain angle to blowing, outlet temperature 90 DEG C, air outlet and foil direct of travel reverse, angle 70 degree, rotation speed of fan 2900rpm, power of fan 11KW, air quantity 8936Pa, air quantity 3619m
3/ h; Be used in before molybdenum plate band enters S roller, carry out prebake effect to the water of strip surface is residual, finally eliminate the adhesion of band at S roller, wrinkling reduces more than 95%, and backfin phenomenon reduces more than 98%.
Embodiment 2
The milling method of the ultra-thin molybdenum plate band of high temperature insulating screen wide cut of the present embodiment, comprises the following steps:
1) hot rolling:
Get powder metallurgy sintered containing lanthanum molybdenum plate blank, specification 57mm × 450mm × 450mm, density 9.6g/cm
3, substance 110kg, described powder metallurgy sintered molybdenum plate blank comprises the component of following mass percent: La0.324%, Si0.003%, Ca0.002%, Mg0.002%, P0.001%, C0.02%, O0.003%, N0.003%, and surplus is Mo.
Pre-treatment is carried out to molybdenum plate blank: molybdenum plate blank is put into 450kw Medium Frequency Induction Heating Furnace, be heated to 905 DEG C having under hydrogen shield atmosphere, insulation 1h; Be heated to 1205 DEG C again, insulation 1h; Then 1605 DEG C are heated to, insulation 1h, rear air cooling, for subsequent use;
Get the molybdenum plate blank after pre-treatment, put into 450kw Medium Frequency Induction Heating Furnace, be heated to 1495 DEG C having under hydrogen shield atmosphere, insulation 20min, is placed on ф 800mm × 1200mm bis-roller hot pack mill and carries out split rolling method; Before molybdenum plate blank enters roll, first molybdenum plate blank steel brush is polished, dispose the oxide skin on molybdenum plate blank surface; This process time controls within 2min, after cleaning out, rapidly molybdenum plate blank is pushed roll;
In split rolling method process, carry out four fire time four-pass cogging hot rollings altogether with the mill speed of 38m/min; After every time hot rolling terminates, also to heat the molybdenum plate blank of cooling; Rear three passage heating-up temperatures are lower than the first passage 50 DEG C, are set as 1445 DEG C, temperature retention time 50min;
In split rolling method process, the first passage, the 3rd passage along parallel direction rolling, the second passage, four-pass vertically tandem rolling; First pass deformation rate adopts the aximal deformation value of 30% ~ 32%, second, third, four-pass deformation rate is 35% ~ 38%; The thickness of the present embodiment is the molybdenum plate blank that 57 ± 0.2mm is thick, and drafts is as shown in table 1 below:
Every time pressure scale in table 1 embodiment 1 cogging course of hot rolling
| Passage | 1 | 2 | 3 | 4 |
| Supplied materials thickness (mm) | 57.00 | 39.90 | 25.94 | 16.08 |
| Finished product thickness (mm) | 39.90 | 25.94 | 16.08 | 10.00 |
| Absolute draft amount (%) | 17.10 | 13.96 | 9.86 | 6.08 |
| Relative reduction (%) | 30.00 | 35.00 | 38.00 | 37.81 |
| General working rate (%) before final pass | 0.00 | 31.00 | 54.49 | 71.56 |
| General working rate (%) after final pass | 30.00 | 54.49 | 71.79 | 82.46 |
In split rolling method process, keep mill speed 38m/min;
After four-pass rolling terminates, air cooling, cleans molybdenum plate in molten state alkali pond, and rear water punching, with grinder buffing oxide skin and crackle; Shear treatment is carried out to the head of gained molybdenum plate, effectively controls peeling layering, obtain good surface quality, obtain the molybdenum plate A of long 1100mm × wide 1000mm × thick 10mm;
2) warm-rolling:
Get step 1) gained molybdenum plate A, puts into 450kw Medium Frequency Induction Heating Furnace, is heated to 1100 DEG C having under hydrogen shield atmosphere, after preheating 20min, is placed in 1200mm 4-roller reversible cold rolling mill group, carry out 5 fire time warm-rollings with the mill speed of 44m/min;
In warm-rolling process, once, rolling pass is once time heating of every fire; The thickness of every time rolling pressure accounts for 25% ~ 30% of the front gross thickness of pressure; In warm-rolling process, processing drafts will control moderate, and pass deformation is unsuitable too small, is generally greater than 25%; But because warm-rolling molybdenum plate band heating-up temperature is restricted, heat a total deformation unsuitable excessive, generally not higher than 30%; The thickness of the present embodiment is the molybdenum plate blank that 10 ± 0.1mm is thick, and drafts is as shown in table 2 below:
Every time pressure scale in table 2 embodiment 1 warm-rolling process
| Passage | 1 | 2 | 3 | 4 | 5 |
| Supplied materials thickness (mm) | 10.00 | 7.50 | 5.63 | 3.94 | 2.76 |
| Finished product thickness (mm) | 7.50 | 5.63 | 3.94 | 2.76 | 2 |
| Absolute draft amount (%) | 2.50 | 1.87 | 1.69 | 1.18 | 0.76 |
| Relative reduction (%) | 25.00 | 25.00 | 30.00 | 30 | 27.54 |
| General working rate (%) before final pass | 0.00 | 25.00 | 43.70 | 60.60 | 72.40 |
| General working rate (%) after final pass | 25.00 | 43.70 | 60.60 | 72.40 | 80.00 |
In warm-rolling process, maintenance mill speed is 42m/min;
After 5th passes terminates, molybdenum plate is heated to 895 DEG C of annealing, air cooling after maintenance 60min; Gained molybdenum plate preparation is cleaned, obtains the molybdenum plate B of long 5000mm × wide 1100mm × thick 2mm;
3) cold rolling:
Get step 2) gained molybdenum plate B, at room temperature uses 1200mm 4-roller reversible cold rolling mill group, carries out seven passages cold rolling with the mill speed of 62m/min;
Described cold rolling for tandem rolling; In cold-rolled process, the thickness of every time pressure accounts for 20% ~ 22% of the front gross thickness of pressure; The thickness of the present embodiment is the molybdenum plate blank of 2 ± 0.1mm, and drafts is as shown in table 3 below:
Every time pressure scale in table 3 embodiment 1 cold-rolled process
| Passage | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Supplied materials thickness (mm) | 2.00 | 1.60 | 1.28 | 1.02 | 0.80 | 0.62 | 0.50 |
| Finished product thickness (mm) | 1.60 | 1.28 | 1.02 | 0.80 | 0.62 | 0.50 | 0.40 |
| Absolute draft amount (%) | 0.40 | 0.32 | 0.26 | 0.22 | 0.18 | 0.12 | 0.10 |
| Relative reduction (%) | 20.00 | 20.00 | 20.00 | 22.00 | 22.00 | 20.00 | 20.00 |
| General working rate (%) before final pass | 0.00 | 20.00 | 36.00 | 49.00 | 60.00 | 69.00 | 75.00 |
| General working rate (%) after final pass | 20.00 | 36.00 | 49.00 | 60.00 | 69.00 | 75.00 | 80.00 |
In cold-rolled process, mill speed controls at 62m/min;
After 7th passes terminates, the molybdenum plate after rolling is heated to 950 DEG C of annealing, air cooling after maintenance 40min; Gained molybdenum plate band preparation is cleaned, obtains the molybdenum plate C of long 25000mm × wide 1100mm × thick 0.4mm;
4) smooth:
By step 3) gained molybdenum plate C is rolled with the mill speed of 62m/min, and rolling deformation rate is 1%;
Molybdenum plate after rolling being placed in the reversible planisher of 1200mm tetra-roller carries out smooth; Before smooth, breaker roll carries out grinding, and backing roll is ground to plain-barreled roll, and cylindricity is 0.01mm; The cylindricity of working roll is 0.005mm, and roughness is 0.2; In top roll, height is 0.004mm, and lower roll is plain-barreled roll, and two roller diameter deviations are 0.01mm; Improve the purging system of planisher inlet location, increase by row's nozzle, the angle between nozzle blowing direction and molybdenum plate is 145 degree, adopts water content and the few instrument supply gas of impurity, reduces the dirt of molybdenum plate belt surface;
Time smooth, the smooth speed controlling planisher is 50m/min (being less than 60m/min), reduces the appearance of vibration line; By monitoring production and processing, control the roll change cycle, roll rolling time is long, the serious uneven wear of roll surface, and roll crown reduces too many, may cause flatness defect; After smooth end, obtain described molybdenum plate band.
Gained molybdenum plate band is placed in mass concentration be 6% NaOH solution carry out ultrasonic cleaning, by prebake, the effect of S roller tension force, hot-air seasoning, obtain the ultra-thin molybdenum plate band of described high temperature insulating screen wide cut.
In cleaning process, described prebake increases 20KW high-pressure hot wind prebake system, adopts upper and lower certain angle to blowing, outlet temperature 70 DEG C, air outlet and foil direct of travel reverse, angle 60 degree, rotation speed of fan 2900rpm, power of fan 11KW, air quantity 8936Pa, air quantity 3619m
3/ h; Be used in before molybdenum plate band enters S roller, carry out prebake effect to the water of strip surface is residual, finally eliminate the adhesion of band at S roller, wrinkling reduces more than 95%, and backfin phenomenon reduces more than 98%.
Embodiment 3
The milling method of the ultra-thin molybdenum plate band of high temperature insulating screen wide cut of the present embodiment, comprises the following steps:
1) hot rolling:
Get powder metallurgy sintered containing lanthanum molybdenum plate blank, specification 57mm × 450mm × 450mm, density 9.6g/cm
3, substance 110kg, described powder metallurgy sintered molybdenum plate blank comprises the component of following mass percent: La0.324%, Si0.003%, Ca0.002%, Mg0.002%, P0.001%, C0.02%, O0.003%, N0.003%, and surplus is Mo.
Pre-treatment is carried out to molybdenum plate blank: molybdenum plate blank is put into 450kw Medium Frequency Induction Heating Furnace, be heated to 895 DEG C having under hydrogen shield atmosphere, insulation 1h; Be heated to 1195 DEG C again, insulation 1h; Then 1595 DEG C are heated to, insulation 1h, rear air cooling, for subsequent use;
Get the molybdenum plate blank after pre-treatment, put into 450kw Medium Frequency Induction Heating Furnace, be heated to 1505 DEG C having under hydrogen shield atmosphere, insulation 20min, is placed on ф 800mm × 1200mm bis-roller hot pack mill and carries out split rolling method; Before molybdenum plate blank enters roll, first molybdenum plate blank steel brush is polished, dispose the oxide skin on molybdenum plate blank surface; This process time controls within 2min, after cleaning out, rapidly molybdenum plate blank is pushed roll;
In split rolling method process, carry out four fire time four-pass cogging hot rollings altogether with the mill speed of 40m/min; After every time hot rolling terminates, also to heat the molybdenum plate blank of cooling; Rear three passage heating-up temperatures are lower than the first passage 50 DEG C, are set as 1455 DEG C, temperature retention time 50min;
In split rolling method process, the first passage, the 3rd passage along parallel direction rolling, the second passage, four-pass vertically tandem rolling; First pass deformation rate adopts the aximal deformation value of 30% ~ 32%, second, third, four-pass deformation rate is 35% ~ 38%; The thickness of the present embodiment is the molybdenum plate blank that 57 ± 0.2mm is thick, and drafts is as shown in table 1 below:
Every time pressure scale in table 1 embodiment 1 cogging course of hot rolling
| Passage | 1 | 2 | 3 | 4 |
| Supplied materials thickness (mm) | 57.00 | 38.76 | 24.03 | 15.62 |
| Finished product thickness (mm) | 38.76 | 24.03 | 15.62 | 10.00 |
| Absolute draft amount (%) | 18.24 | 14.73 | 8.41 | 5.62 |
| Relative reduction (%) | 32.00 | 38.00 | 35.00 | 35.98 |
| General working rate (%) before final pass | 0.00 | 32.00 | 57.84 | 72.60 |
| General working rate (%) after final pass | 32.00 | 57.84 | 72.60 | 82.46 |
In split rolling method process, keep mill speed 42m/min;
After four-pass rolling terminates, air cooling, cleans molybdenum plate in molten state alkali pond, and rear water punching, with grinder buffing oxide skin and crackle; Shear treatment is carried out to the head of gained molybdenum plate, effectively controls peeling layering, obtain good surface quality, obtain the molybdenum plate A of long 1100mm × wide 1000mm × thick 10mm;
2) warm-rolling:
Get step 1) gained molybdenum plate A, puts into 450kw Medium Frequency Induction Heating Furnace, is heated to 1105 DEG C having under hydrogen shield atmosphere, after preheating 20min, is placed in 1200mm 4-roller reversible cold rolling mill group, carry out 5 fire time warm-rollings with the mill speed of 46m/min;
In warm-rolling process, once, rolling pass is once time heating of every fire; The thickness of every time rolling pressure accounts for 25% ~ 30% of the front gross thickness of pressure; In warm-rolling process, processing drafts will control moderate, and pass deformation is unsuitable too small, is generally greater than 25%; But because warm-rolling molybdenum plate band heating-up temperature is restricted, heat a total deformation unsuitable excessive, generally not higher than 30%; The thickness of the present embodiment is the molybdenum plate blank that 10 ± 0.1mm is thick, and drafts is as shown in table 2 below:
Every time pressure scale in table 2 embodiment 1 warm-rolling process
| Passage | 1 | 2 | 3 | 4 | 5 |
| Supplied materials thickness (mm) | 10.00 | 7.00 | 4.90 | 3.58 | 2.69 |
| Finished product thickness (mm) | 7.00 | 4.90 | 3.58 | 2.69 | 2 |
| Absolute draft amount (%) | 3.00 | 2.10 | 1.32 | 0.89 | 0.69 |
| Relative reduction (%) | 30.00 | 30.00 | 27.00 | 25 | 25.65 |
| General working rate (%) before final pass | 0.00 | 30.00 | 51.00 | 64.20 | 73.10 |
| General working rate (%) after final pass | 30.00 | 51.00 | 64.20 | 73.10 | 80.00 |
In warm-rolling process, maintenance mill speed is 46m/min;
After 5th passes terminates, molybdenum plate is heated to 905 DEG C of annealing, air cooling after maintenance 60min; Gained molybdenum plate preparation is cleaned, obtains the molybdenum plate B of long 5000mm × wide 1100mm × thick 2mm;
3) cold rolling:
Get step 2) gained molybdenum plate B, at room temperature uses 1200mm 4-roller reversible cold rolling mill group, carries out seven passages cold rolling with the mill speed of 58m/min;
Described cold rolling for tandem rolling; In cold-rolled process, the thickness of every time pressure accounts for 20% ~ 22% of the front gross thickness of pressure; The thickness of the present embodiment is the molybdenum plate blank of 2 ± 0.1mm, and drafts is as shown in table 3 below:
Every time pressure scale in table 3 embodiment 1 cold-rolled process
| Passage | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Supplied materials thickness (mm) | 2.00 | 1.56 | 1.22 | 0.98 | 0.78 | 0.62 | 0.50 |
| Finished product thickness (mm) | 1.56 | 1.22 | 0.98 | 0.78 | 0.62 | 0.50 | 0.40 |
| Absolute draft amount (%) | 0.44 | 0.34 | 0.24 | 0.20 | 0.16 | 0.12 | 0.10 |
| Relative reduction (%) | 22.00 | 22.00 | 20.00 | 20.00 | 20.00 | 20.00 | 20.00 |
| General working rate (%) before final pass | 0.00 | 22.00 | 39.00 | 51.50 | 61.00 | 69.00 | 75.00 |
| General working rate (%) after final pass | 22.00 | 39.00 | 51.00 | 61.00 | 69.00 | 75.00 | 80.00 |
In cold-rolled process, mill speed controls at 58m/min;
After 7th passes terminates, the molybdenum plate after rolling is heated to 945 DEG C of annealing, air cooling after maintenance 40min; Gained molybdenum plate band preparation is cleaned, obtains the molybdenum plate C of long 25000mm × wide 1100mm × thick 0.4mm;
4) smooth:
By step 3) gained molybdenum plate C is rolled with the mill speed of 58m/min, and rolling deformation rate is 1%;
Molybdenum plate after rolling being placed in the reversible planisher of 1200mm tetra-roller carries out smooth; Before smooth, breaker roll carries out grinding, and backing roll is ground to plain-barreled roll, and cylindricity is 0.01mm; The cylindricity of working roll is 0.005mm, and roughness is 0.2; In top roll, height is 0.004mm, and lower roll is plain-barreled roll, and two roller diameter deviations are 0.01mm; Improve the purging system of planisher inlet location, increase by row's nozzle, the angle between nozzle blowing direction and molybdenum plate is 145 degree, adopts water content and the few instrument supply gas of impurity, reduces the dirt of molybdenum plate belt surface;
Time smooth, the smooth speed controlling planisher is 50m/min (being less than 60m/min), reduces the appearance of vibration line; By monitoring production and processing, control the roll change cycle, roll rolling time is long, the serious uneven wear of roll surface, and roll crown reduces too many, may cause flatness defect; After smooth end, obtain described molybdenum plate band.
Gained molybdenum plate band is placed in mass concentration be 7% NaOH solution carry out ultrasonic cleaning, by prebake, the effect of S roller tension force, hot-air seasoning, obtain the ultra-thin molybdenum plate band of described high temperature insulating screen wide cut.
In cleaning process, described prebake increases 20KW high-pressure hot wind prebake system, adopts upper and lower certain angle to blowing, outlet temperature 80 DEG C, air outlet and foil direct of travel reverse, angle 65 degree, rotation speed of fan 2900rpm, power of fan 11KW, air quantity 8936Pa, air quantity 3619m
3/ h; Be used in before molybdenum plate band enters S roller, carry out prebake effect to the water of strip surface is residual, finally eliminate the adhesion of band at S roller, wrinkling reduces more than 95%, and backfin phenomenon reduces more than 98%.
Experimental example
The ultra-thin molybdenum plate carry sample of Example 1 ~ 3 gained high temperature insulating screen wide cut carries out Performance Detection, and testing result is as shown in table 7.
Wherein, comparative example is commercial goods (cold-rolling thin molybdenum plate that Jinduicheng Molybdenum Co., Ltd produces, operative norm: ASTM B386-03, thick 0.2-2mm, wide 600mm, long 20000mm).
Table 7 embodiment 1 ~ 3 gained high temperature insulating screen wide cut ultra-thin molybdenum plate band performance test results
Performance test results shows: the ultra-thin molybdenum plate band of embodiment 1 ~ 3 gained high temperature insulating screen wide cut, and structure cell is aobvious oval, and crystal grain is even, and gap is little; Average crystal grain length 25 μm, reduce 25%, and total amount is less than 15% more than 60 μm of number of die than common molybdenum plate (comparative example); The common molybdenum plate of density equalization improves more than 50%.The high temperature insulating body material processed with this molybdenum plate band, plasticity improves more than 30%, intensity improves more than 15%, anisotropy reduces by 10%, the defects such as molybdenum plate surface flawless, peeling, burr, molybdenum plate surfacing, smooth rate improves more than 80% than common molybdenum plate, and surface cleanness improves more than 80%.Result of the test shows: the milling method of the ultra-thin molybdenum plate band of high temperature insulating screen wide cut of the present invention, and gained finished product molybdenum plate specification is large, and coarse grain is less, crystal grain gap is little, density is even, field trash is less, yield rate is high, and other defect also seldom occurs; Gained molybdenum plate band finished product serviceability and surface quality higher, meet the instructions for use that molybdenum plate band shields as high temperature insulating, drastically increase molybdenum plate band for construction quality when high temperature furnace heat-barrier material, high-temperature heating body and nuclear reactor sheath material and engineering efficiency.
Claims (10)
1. a milling method for the ultra-thin molybdenum plate band of high temperature insulating screen wide cut, is characterized in that: comprise the following steps:
1) hot rolling: get powder metallurgy sintered containing lanthanum molybdenum plate blank, four fire time four-pass hot rollings are carried out with the mill speed of 38 ~ 42m/min, the heating-up temperature of the first passage hot rolling is 1495 ~ 1505 DEG C, second, third, the heating-up temperature of four-pass hot rolling is 1445 ~ 1455 DEG C, air cooling after four-pass hot rolling, alkali cleaning, obtains molybdenum plate A;
2) warm-rolling: get step 1) gained molybdenum plate A, be heated to 1095 ~ 1105 DEG C, carry out five fire time rollings with the mill speed of 42 ~ 46m/min, by annealing in process, obtain molybdenum plate B;
3) cold rolling: to get step 2) gained molybdenum plate B, carries out seven passages with the mill speed of 58 ~ 62m/min cold rolling, by annealing in process, obtains molybdenum plate C;
4) smooth: by step 3) after gained molybdenum plate C is rolled with the mill speed of 58 ~ 62m/min, carries out smooth, obtain described molybdenum plate band.
2. the milling method of the ultra-thin molybdenum plate band of high temperature insulating screen wide cut according to claim 1, it is characterized in that: step 1) in, described molybdenum plate blank had carried out pre-treatment before hot rolling, described pre-treatment is by molybdenum plate blank in a hydrogen atmosphere, is heated to 895 ~ 905 DEG C and is incubated 0.9 ~ 1.1h; Be heated to 1195 ~ 1205 DEG C again and be incubated 0.9 ~ 1.1h; Then 1595 ~ 1605 DEG C are heated to and after being incubated 0.9 ~ 1.1h, air cooling, for subsequent use.
3. the milling method of the ultra-thin molybdenum plate band of high temperature insulating screen wide cut according to claim 1, it is characterized in that: step 1) in, in described four fire time four-pass course of hot rolling, before the first passage hot rolling, molybdenum plate blank be heated to 1495 ~ 1505 DEG C in a hydrogen atmosphere and start rolling after being incubated 19 ~ 21min; Second, third, molybdenum plate blank be heated in a hydrogen atmosphere 1445 ~ 1455 DEG C respectively before four-pass hot rolling and start rolling after being incubated 49 ~ 51min.
4. the milling method of the ultra-thin molybdenum plate band of high temperature insulating screen wide cut according to claim 1, it is characterized in that: step 1) in, described four fire time four-pass hot rollings are for intersecting hot rolling, described intersection hot rolling refers to that the first, the 3rd passage hot rolling is along parallel direction rolling, second, four-pass vertically tandem rolling.
5. the milling method of the ultra-thin molybdenum plate band of high temperature insulating screen wide cut according to claim 1,3 or 4, is characterized in that: step 1) in, in described four fire time four-pass course of hot rolling, the deformation rate of the first passage hot rolling is 30% ~ 32%; Second, third, the deformation rate of four-pass hot rolling is 35% ~ 38%.
6. the milling method of the ultra-thin molybdenum plate band of high temperature insulating screen wide cut according to claim 1, is characterized in that: step 2) in, in the described five fire time operations of rolling, often heat once, rolling pass is no more than 2 passages; The thickness of every time rolling pressure accounts for 25% ~ 30% of the front gross thickness of pressure.
7. the milling method of the ultra-thin molybdenum plate band of high temperature insulating screen wide cut according to claim 1 or 6, is characterized in that: step 2) in, described annealing in process molybdenum plate is heated to 895 ~ 905 DEG C and after being incubated 59 ~ 61min, air cooling; Step 3) in, described annealing in process molybdenum plate is heated to 945 ~ 955 DEG C and after being incubated 39 ~ 41min, air cooling.
8. the milling method of the ultra-thin molybdenum plate band of high temperature insulating screen wide cut according to claim 1, is characterized in that: step 3) in, in described seven passage cold-rolled process, the thickness of every time rolling pressure accounts for 20% ~ 22% of the front gross thickness of pressure.
9. the milling method of the ultra-thin molybdenum plate band of high temperature insulating screen wide cut according to claim 1, is characterized in that: step 4) in, described smooth speed is less than 60m/min.
10. the milling method of the ultra-thin molybdenum plate band of high temperature insulating screen wide cut according to claim 1, is characterized in that: to step 4) gained molybdenum plate band cleans; Described cleaning molybdenum plate band is placed in NaOH solution carry out ultrasonic cleaning.
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|---|---|---|---|---|
| CN106591614A (en) * | 2016-11-11 | 2017-04-26 | 洛阳科威钨钼有限公司 | Manufacturing technology of arc-shaped molybdenum plate for long-service-life heat shield |
| CN109848424A (en) * | 2018-12-03 | 2019-06-07 | 有研工程技术研究院有限公司 | A kind of grid pulse travelling-wave tubes aperture plate molybdenum foil and preparation method thereof |
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| CN103774020A (en) * | 2014-01-23 | 2014-05-07 | 安泰科技股份有限公司 | Method for preparing molybdenum-rhenium alloy foil |
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| JPH01205054A (en) * | 1988-02-09 | 1989-08-17 | Tokyo Tungsten Co Ltd | Molybdenum material and its production |
| JPH06256918A (en) * | 1992-05-15 | 1994-09-13 | Japan Energy Corp | Production of molybdenum or molybdenum alloy sheet |
| CN1483850A (en) * | 2003-08-02 | 2004-03-24 | 宜兴市兴达合金材料厂 | Method for working ultrathin high-planeness molybdenum sheet |
| CN101016608A (en) * | 2007-02-07 | 2007-08-15 | 宜兴市宝登合金有限公司 | Ultra-thin precision deep drawing molding rolling method for molybdenum sheet |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106591614A (en) * | 2016-11-11 | 2017-04-26 | 洛阳科威钨钼有限公司 | Manufacturing technology of arc-shaped molybdenum plate for long-service-life heat shield |
| CN109848424A (en) * | 2018-12-03 | 2019-06-07 | 有研工程技术研究院有限公司 | A kind of grid pulse travelling-wave tubes aperture plate molybdenum foil and preparation method thereof |
| CN109848424B (en) * | 2018-12-03 | 2021-08-10 | 有研工程技术研究院有限公司 | Molybdenum foil for grid control pulse traveling wave tube grid mesh and preparation method thereof |
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| CN104607464B (en) | 2016-08-10 |
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