CN106425326A - Bainite steel or martensite steel membrane type wall tube panel bending method - Google Patents
Bainite steel or martensite steel membrane type wall tube panel bending method Download PDFInfo
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- CN106425326A CN106425326A CN201611078769.0A CN201611078769A CN106425326A CN 106425326 A CN106425326 A CN 106425326A CN 201611078769 A CN201611078769 A CN 201611078769A CN 106425326 A CN106425326 A CN 106425326A
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- band steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- Bending Of Plates, Rods, And Pipes (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a bainite steel or martensite steel membrane type wall tube panel bending method. The method comprises the following steps of: welding and assembling a bainite steel or martensite steel tube with a bainite steel or martensite steel flat into a small screen, determining a panel bending region and a bending start line, a bend center line and a bending end line in advance before welding, and controlling an end position of a steel flat fillet weld not to exceed the bend center line in the panel bending region during welding; carrying out panel bending treatment on the small screen; carrying out trial assembly on a plurality of small screens to form a large screen, and accordingly correcting the panel bending dimension of each small screen according to the trial assembly condition, so that the panel bending dimension between adjacent small screens meets large screen assembling requirement; after the small screens are corrected and qualified, completing welding of the original unwelded steel flat fillet weld, and assembling a plurality of small screens into a large screen; and carrying out bulk heat treatment on a tube panel. The method disclosed by the invention can be used for solving the problem that a crack can be easily produced in a bend region in a panel bending process and also can be used for solving the problem that a panel bending bend is difficult to correct at relatively low temperature.
Description
Technical field
The invention belongs to the technical field of boiler diaphragm type wall tube panel manufacture, more particularly, is related to one kind with regard to bainite
The membrane panel of the high grade material such as steel or martensite steel manufacture bending method in a row.
Background technology
With the raising of station boiler parameter, the grade of water-cooling wall material is also being improved constantly, especially with high parameter
The development of boiler technology, top water-cooling wall material has used bainitic steel or martensite steel, as this strength of materials is high and marks
Accurate very strict to deformation temperature requirement, the Panel Bending manufacture of the cold wall that feeds water brings very big difficulty.
Current panelized-tube-wall section is all carbon steel and low alloy steel pipe and pipe wall ratio is relatively thin mostly, and Panel Bending is easier to
Realize.Present bending process in a row is as follows：First welding pipe and band steel, become smaller screen；The material manufacture higher to intensity
Tube panel carries out heat treatment to reduce weld strength, next carries out Panel Bending to smaller screen, then assembles large-size screen monitors, in assembling large-size screen monitors
When, make the angle of bend between adjacent smaller screen consistent by the method for thermal recalibration, so as to ensure the dimensional accuracy of whole tube panel, pipe
Bulk heat treatmet is carried out again after the completion of screen manufacture.
But the top water-cooling wall for high parameter boiler, as material has used bainitic steel or martensite steel, membrane wall
Tube panel is easily cracked in Panel Bending, and, the correction temperature of 9Cr martensite steel is specified no more than 705 DEG C by standard,
Overall normalizing+temper is otherwise needed, then high cost, cycle are long for overall normalizing, and tube panel deformation is difficult to control to.9Cr geneva
The membrane panel of body steel is very high due to intensity, it is difficult to complete the correction of elbow in a row at the temperature below 705 DEG C, this gives
The panelized-tube-wall section manufacture of 9Cr martensitic steel material brings very big difficulty.
Content of the invention
In order to solve problems of the prior art, it is an object of the invention to provide one kind can not only solve Panel Bending area
Domain is also easy to produce the problem of crackle, and can solve the problems, such as that elbow is difficult to correct at a lower temperature, while reducing Panel Bending
The bainitic steel of before processing heat treatment or martensite steel membrane panel bending method in a row.
The invention provides a kind of bainitic steel or martensite steel membrane panel bending method in a row, methods described include with
Lower step：
A, bainitic steel or martensite steel pipe and bainitic steel or martensite steel band steel welding assembly are become smaller screen, its
In, predefine Panel Bending region before welding and curved line, elbow centrage and whole curved line is played, and control band steel in welding
The final position of angle welding is less than the elbow centrage in Panel Bending region；
B, Panel Bending process is carried out to the smaller screen；
C, the examination of several smaller screens is assembled into large-size screen monitors and phase is carried out to the Panel Bending size of each smaller screen according to examination assembling situation
The correction that answers, makes the Panel Bending size between adjacent smaller screen meet the requirement of assembling large-size screen monitors；
D., after smaller screen correction is qualified, completes the welding of former unwelded band steel angle welding and several smaller screens are assembled into
Large-size screen monitors；
E, bulk heat treatmet is carried out to tube panel.
According to the bainitic steel of the present invention or one embodiment of martensite steel membrane panel bending method in a row, in step
In A, the curved line that rises for controlling the final position of band steel angle welding to exceed Panel Bending region is not more than 100mm.
According to the bainitic steel of the present invention or one embodiment of martensite steel membrane panel bending method in a row, in step
In A, the final position of band steel angle welding is controlled to rise in the range of curved line ± 50mm.
According to the bainitic steel of the present invention or one embodiment of martensite steel membrane panel bending method in a row, in step
In A, the width of the smaller screen is less than 1.6m.
According to the bainitic steel of the present invention or one embodiment of martensite steel membrane panel bending method in a row, in step
In A, the band steel in unwelded angle welding region is assembled using following two modes and pipe：
A) Panel Bending before processing assembling：The each band steel in unwelded angle welding region and the band steel for welding angle welding region
For same band steel；In Panel Bending before processing, the band steel of unwelded angle welding is got up with adjacent pipe spot welding, and in a row
During the reason of crook, band steel is bent together with pipe；
B) assemble after Panel Bending is processed：Band steel is not assembled when Panel Bending is processed in the region of the unwelded angle welding of tube panel, should
The band steel in region separately bends, after Panel Bending process complete and correct put in place after again the band steel for bending is welded on the region.
According to the bainitic steel of the present invention or one embodiment of martensite steel membrane panel bending method in a row, in step
In D, unwelded band steel being assembled with Panel Bending before processing, before the former unwelded band steel angle welding of welding, first examines
Make an inventory of whether welding line ftractures, if cracking, polishing removes spot welded joint and welds angle welding again；Fill for after Panel Bending is processed
Join band steel, then need to adjust after band steel and the relative position of pipe Welding flat steel angle welding again.
According to the bainitic steel of the present invention or one embodiment of martensite steel membrane panel bending method in a row, in step
In B, the Panel Bending is processed as clod wash mode, and it is bigger than final angle of bend 2 ° to set the angle of bend of crook in a row reason
Above as resilience surplus.
According to the bainitic steel of the present invention or one embodiment of martensite steel membrane panel bending method in a row, in step
In B, the resilience is balance of 2 °～8 °.
According to the bainitic steel of the present invention or one embodiment of martensite steel membrane panel bending method in a row, in step
In C, correction temperature control is below 700 DEG C, and timing takes the mode that single cell corrects or many pipes school together by root
Positive mode, until correct consistent to the angle of bend of adjacent smaller screen.
According to the bainitic steel of the present invention or one embodiment of martensite steel membrane panel bending method in a row, in step
In E, heat treatment temperature is controlled to 730～775 DEG C.
The end of the bainitic steel of the present invention or martensite steel membrane panel bending method in a row by adjustment band steel angle welding
Stop bit is put to reduce the band steel welding capacity in Panel Bending region, or the band steel in Panel Bending region is separated with pipe bend after reassemble
Band steel so that the rigidity in Panel Bending region and intensity are significantly reduced, is also easy to produce in elbow region during both having solved Panel Bending
The problem of crackle, also solves the problems, such as that bending elbow in a row is difficult to correct at a lower temperature, while before reducing Panel Bending
Heat treatment, so as to save cost and cycle.
Description of the drawings
Fig. 1 shows bainitic steel according to an exemplary embodiment of the present invention or martensite steel membrane panel Panel Bending side
The structural representation of step A small and medium-sized screen in method.
Fig. 2 shows bainitic steel according to an exemplary embodiment of the present invention or martensite steel membrane panel Panel Bending side
Structural representation after step B small and medium-sized screen Panel Bending is processed in method.
Fig. 3 shows bainitic steel according to an exemplary embodiment of the present invention or martensite steel membrane panel Panel Bending side
In method, step D small and medium-sized screen is assembled into the structural representation of large-size screen monitors.
Description of reference numerals：
1- bainitic steel or martensite steel pipe, 2- bainitic steel or martensite steel band steel, 3- band steel angle welding, 4- band steel
Spot welding region；
A- plays curved line, b- elbow centrage, c- end curved line, Z- Panel Bending region.
Specific embodiment
All features disclosed in this specification, or disclosed all methods or during the step of, except mutually exclusive
Feature and/or step beyond, all can combine by any way.
Any feature disclosed in this specification, unless specifically stated otherwise, all can be equivalent or with similar purpose by other
Alternative features are replaced.I.e., unless specifically stated otherwise, each feature is an example in a series of equivalent or similar characteristics
?.
Manufacture for bainitic steel or martensite steel panelized-tube-wall section, use conventional methods manufacture and there is problems with：
(1), during Panel Bending, the weld seam in elbow region is easily cracked；(2) school is difficult after Panel Bending under 705 DEG C and following temperature
Just, so as to affect the dimensional accuracy of tube panel；(3) needing before Panel Bending heat treatment to be carried out to tube panel, increased cost and cycle.
For problem above, the invention provides a kind of bainitic steel or martensite steel membrane panel bending method in a row,
Can not only solve the problems, such as that Panel Bending region is also easy to produce crackle, and elbow can be solved in lower temperature (in exempting from for standard regulation
Below the temperature of normalizing) under be difficult to the problem that corrects, while reducing the heat treatment of Panel Bending before processing, be conducive to shortening week
Phase reduces cost.
The bainitic steel of the present invention or martensite steel membrane panel bending method in a row will be described in detail below.
According to the exemplary embodiment of the present invention, the bainitic steel or martensite steel membrane panel bending method bag in a row
Include following multiple steps.
Step A：
Bainitic steel or martensite steel pipe 1 are become smaller screen with bainitic steel or 2 welding assembly of martensite steel band steel, its
In, predefine Panel Bending region Z before welding and curved line a, elbow centrage b and whole curved line c is played, and control in welding
The final position of band steel angle welding 3 is less than the elbow centrage b of Panel Bending region Z.Wherein, control the width of each smaller screen not
More than 1.6m, to avoid follow-up Panel Bending difficulty too big.
Fig. 1 shows bainitic steel according to an exemplary embodiment of the present invention or martensite steel membrane panel Panel Bending side
The structural representation of step A small and medium-sized screen in method.As shown in figure 1, first according to the requirement that need to carry out Panel Bending process and elbow angle
Degree determines Panel Bending region Z and plays curved line a, elbow centrage b and whole curved line c, is on the one hand convenient for follow-up Panel Bending
Process, be on the other hand in order to determine the final position of band steel angle welding 3.
Wherein, in order to reduce the band steel welding capacity in the Z of Panel Bending region so that the rigidity of tube panel and intensity decreases, and then
Be conducive in a row being bent and correcting, the present invention is only welded to form a part of band steel angle welding when smaller screen is welded, that is, control
The final position of band steel angle welding 3 processed is less than the elbow centrage b of Panel Bending region Z.Preferably, control band steel angle welding 3
Final position exceed Panel Bending region Z rise curved line a be not more than 100mm apart from m.It is highly preferred that control band steel angle welding 3
Final position rise curved line ± 50mm in the range of.
For the band steel in remaining unwelded angle welding region, can be which to be carried out with pipe using following two modes
Assembling.
A) Panel Bending before processing assembling：The each band steel in unwelded angle welding region and the band steel for welding angle welding region
For same band steel；In Panel Bending before processing, the band steel of unwelded angle welding and pipe spot welding are got up to be formed band steel spot welding region
4 (as shown in Figure 1), and when Panel Bending is processed, band steel is bent together with pipe.
B) assemble after Panel Bending is processed：Band steel is not assembled when Panel Bending is processed in unwelded angle welding region, the region
Band steel separately bends, after Panel Bending process complete and correct put in place after again the band steel for bending is welded on the region.
Thus, there is no band steel angle welding as elbow deforms most region, greatly reduce tube panel Panel Bending region
Rigidity and intensity, be not only easy to bending in a row, and be easy to follow-up correction.
Step B：
Panel Bending process is carried out to smaller screen obtained in step A.
Fig. 2 shows bainitic steel according to an exemplary embodiment of the present invention or martensite steel membrane panel Panel Bending side
Structural representation after step B small and medium-sized screen Panel Bending is processed in method.As shown in Fig. 2 the curved region Z of row for determining according to step A
And curved line a, elbow centrage b and whole curved line c carry out corresponding Panel Bending process to smaller screen.Wherein, above-mentioned crook in a row
Reason using clod wash mode, and set the angle of bend of crook in a row reason bigger than final angle of bend more than 2 ° as more than resilience
Amount.Preferably, resilience surplus is controlled to 2 °～8 °.
Step C：
Several smaller screen examinations are assembled into large-size screen monitors and according to examination assembling situation, the Panel Bending size of each smaller screen are carried out accordingly
Correction, make the Panel Bending size between adjacent smaller screen meet assembling large-size screen monitors requirement.
Wherein, if if the angle of bend between adjacent smaller screen has notable difference, direct-assembling can then affect whole for large-size screen monitors
Body size, therefore needs first to carry out examination number of assembling steps, to find the differential seat angle between adjacent smaller screen, and then eliminates the angle by correcting
Degree is poor, and then makes the Panel Bending size between adjacent smaller screen meet the requirement of assembling large-size screen monitors.
In accordance with the present invention it is preferred that being corrected by the way of cold sizing.According to heating correction, temperature control is corrected
Below 700 DEG C, timing takes the mode that the mode that single cell corrects or many pipes are corrected together by root, until correction
Consistent to the angle of bend of adjacent smaller screen.The process of normalizing+tempering can not subsequently be carried out.
Step D：
After smaller screen correction is qualified, completes the welding of former unwelded band steel angle welding and several smaller screens are assembled into greatly
Screen.
Fig. 3 shows bainitic steel according to an exemplary embodiment of the present invention or martensite steel membrane panel Panel Bending side
In method, step D small and medium-sized screen is assembled into the structural representation of large-size screen monitors.As shown in figure 3, after the angle of adjacent smaller screen is consistent, need to complete
The fillet weld seam of unwelded band steel in step A, then several smaller screens are assembled into large-size screen monitors.
For assembling modes different above, the present invention is also to there is different welding manners.For processing in Panel Bending
Before be assembled with unwelded band steel, before the former unwelded band steel angle welding of welding, first check whether spot welded joint ftractures,
If cracking, polishing removes spot welded joint and welds angle welding again；For assembling band steel after Panel Bending is processed, then need to adjust
Welding flat steel angle welding again after band steel and the relative position of pipe.
Step E：
Bulk heat treatmet is carried out to tube panel.Wherein, bulk heat treatmet final to elbow heat treatment and tube panel is carried out in the lump
?.Preferably, control heat treatment temperature is 730～775 DEG C.
By the present invention, easily split during the membrane panel Panel Bending for not only solving bainitic steel or martensite steel asks
Topic, also solves the difficult problem that elbow in a row is difficult to correct, while reducing the heat treatment of Panel Bending before processing, is conducive to shortening life
Product cycle, energy-saving and emission-reduction.A big obstacle is cleared away for the water-cooling wall manufacture of bainitic steel or martensite steel, be the boiler of high parameter
Research and development serve larger impetus
It should be understood that the above-mentioned embodiment of present invention detailed description and following examples are merely to illustrate the present invention rather than limit
The scope of the present invention processed, some nonessential improvement and adjust that those skilled in the art is made according to the above of the present invention
Whole belong to protection scope of the present invention.
With reference to bainitic steel or martensite steel membrane panel in a row bending method work of the specific embodiment to the present invention
Further illustrate.
Embodiment：
As a example by the water-cooling wall simulating piece of top, tube panel material is SA-213T91 (martensite steel) pipe+SA-387GR91
(martensite steel) band steel, tube panel manufacturing process is as follows：
1st, smaller screen is assembled：The width of smaller screen is 900mm and length 9m.Panel Bending region is determined before smaller screen welding and is risen
Curved line, elbow centrage and whole curved line, from curved line to smaller screen left end distance for 2m and to right-hand end distance be.
2nd, smaller screen is welded：From the right-hand member of tube panel, Welding flat steel is stitched to more than curved line Panel Bending region with pipe fillet welding
Stop at 50mm, the band steel of remainder not with tube welding, only get up with pipe spot welding.
3rd, after 48 hours, 100%MT flaw detection is carried out to band steel angle welding.
4th, the Panel Bending for carrying out smaller screen on horizontal bending machine in a row is processed, it is contemplated that the resilience after Panel Bending, during bending
Increase by 4 ° of resilience surplus.
5th, large-size screen monitors are assembled into the examination of two smaller screens, by the elbow adjusting of centerline of the Panel Bending of two smaller screens in assembling process
On bar line, it is found that the angle of bend between adjacent two smaller screen differs 2 ° or so, overall chi can be affected if direct-assembling is large-size screen monitors
Very little.Therefore, it is corrected according to the differential seat angle of adjacent smaller screen, timing is corrected by root, correction temperature control is at 620～700 DEG C
Between, correct at such a temperature, can not subsequently carry out normalizing+temper.
6th, correct angle to adjacent smaller screen consistent after, the fillet weld seam for completing unwelded band steel originally (is beaten before welding
Grind off except spot welded joint), and two smaller screens are assembled into large-size screen monitors.
7th, bulk heat treatmet is carried out to tube panel, Technology for Heating Processing is controlled to 760 ± 15 DEG C/1.5h.Final successfully prepared
Satisfactory martensite steel membrane panel.
In sum, the bainitic steel of the present invention or martensite steel membrane panel bending method in a row are by adjusting band steel weldering
Position is connect reducing the band steel welding capacity in Panel Bending region, or the band steel in Panel Bending region is separated with pipe bend after reassemble
Band steel so that the rigidity in Panel Bending region and intensity decreases, was also easy to produce crackle in elbow region during both having solved Panel Bending
Problem, also solve the problems, such as that bending elbow in a row is difficult to correct at a lower temperature, at the same reduce before Panel Bending heat at
Reason, so as to save cost and cycle.
The invention is not limited in aforesaid specific embodiment.The present invention is expanded to and any is disclosed in this manual
New feature or any new combination, and the arbitrary new method that discloses or the step of process or any new combination.
Claims (10)
1. a kind of bainitic steel or martensite steel membrane panel bending method in a row, it is characterised in that methods described includes following
Step：
A, bainitic steel or martensite steel pipe and bainitic steel or martensite steel band steel welding assembly are become smaller screen, wherein,
Panel Bending region being predefined before welding and plays curved line, elbow centrage and whole curved line, and controls band steel fillet welding in welding
The final position of seam is less than the elbow centrage in Panel Bending region；
B, Panel Bending process is carried out to the smaller screen；
C, the examination of several smaller screens is assembled into large-size screen monitors and according to examination assembling situation, the Panel Bending size of each smaller screen is carried out accordingly
Correction, makes the Panel Bending size between adjacent smaller screen meet the requirement of assembling large-size screen monitors；
D., after smaller screen correction is qualified, completes the welding of former unwelded band steel angle welding and several smaller screens are assembled into greatly
Screen；
E, bulk heat treatmet is carried out to tube panel.
2. bainitic steel according to claim 1 or martensite steel membrane panel bending method in a row, it is characterised in that
In step A, the curved line that rises for controlling the final position of band steel angle welding to exceed Panel Bending region is not more than 100mm.
3. bainitic steel according to claim 2 or martensite steel membrane panel bending method in a row, it is characterised in that
In step A, the final position of band steel angle welding is controlled to rise in the range of curved line ± 50mm.
4. bainitic steel according to claim 1 or martensite steel membrane panel bending method in a row, it is characterised in that
In step A, the width of the smaller screen is less than 1.6m.
5. bainitic steel according to claim 1 or martensite steel membrane panel bending method in a row, it is characterised in that
In step A, the band steel in unwelded angle welding region is assembled using following two modes and pipe：
A) Panel Bending before processing assembling：The each band steel in unwelded angle welding region is same with the band steel in welding angle welding region
A piece band steel；In Panel Bending before processing, the band steel of unwelded angle welding is got up with adjacent pipe spot welding, and in Panel Bending
During process, band steel is bent together with pipe；
B) assemble after Panel Bending is processed：Band steel is not assembled when Panel Bending is processed in the region of the unwelded angle welding of tube panel, the region
Band steel separately bend, after Panel Bending process complete and correct put in place after again the band steel for bending is welded on the region.
6. bainitic steel according to claim 5 or martensite steel membrane panel bending method in a row, it is characterised in that
In step D, be assembled with unwelded band steel in Panel Bending before processing, the former unwelded band steel angle welding of welding it
Before, first check whether spot welded joint ftractures, if cracking, polishing removes spot welded joint and welds angle welding again；For in Panel Bending
Assembling band steel after process, then need to adjust after band steel and the relative position of pipe Welding flat steel angle welding again.
7. bainitic steel according to claim 1 or martensite steel membrane panel bending method in a row, it is characterised in that
In step B, the Panel Bending is processed as clod wash mode, and sets the angle of bend of crook in a row reason than final angle of bend
Big more than 2 ° used as resilience surplus.
8. bainitic steel according to claim 7 or martensite steel membrane panel bending method in a row, it is characterised in that
In step B, the resilience is balance of 2 °～8 °.
9. bainitic steel according to claim 1 or martensite steel membrane panel bending method in a row, it is characterised in that
In step C, correction temperature control is below 700 DEG C, and timing takes the mode or many pipes one that single cell corrects by root
The mode of correction is played, until correcting to consistent with the angle of bend of adjacent smaller screen.
10. bainitic steel according to claim 1 or martensite steel membrane panel bending method in a row, it is characterised in that
In step E, heat treatment temperature is controlled to 730～775 DEG C.
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| CN110202035A (en) * | 2019-07-16 | 2019-09-06 | 江苏汇能锅炉有限公司 | A kind of ultra-supercritical boiler heating surface tube panel Panel Bending plumber's skill |
| CN112846463A (en) * | 2021-01-08 | 2021-05-28 | 哈尔滨锅炉厂有限责任公司 | Method for welding SA-213S30432 material membrane type tube panel |
| CN115365766A (en) * | 2022-08-20 | 2022-11-22 | 欧萨斯能源环境设备(南京)有限公司 | Manufacturing process of waste heat boiler wall and tube panel |
| CN115365766B (en) * | 2022-08-20 | 2024-05-07 | 欧萨斯能源环境设备(南京)有限公司 | Waste heat boiler wall and tube panel manufacturing process |
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