CN109682658A - Avoid the DWTT sample and its method of big wall thickness high tenacity X80 steel pipe DWTT abnormal fracture - Google Patents
Avoid the DWTT sample and its method of big wall thickness high tenacity X80 steel pipe DWTT abnormal fracture Download PDFInfo
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- CN109682658A CN109682658A CN201811607634.8A CN201811607634A CN109682658A CN 109682658 A CN109682658 A CN 109682658A CN 201811607634 A CN201811607634 A CN 201811607634A CN 109682658 A CN109682658 A CN 109682658A
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- dwtt
- sample
- steel pipe
- wall thickness
- high tenacity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0274—Tubular or ring-shaped specimens
Abstract
The invention discloses a kind of DWTT samples and its method for avoiding big wall thickness high tenacity X80 steel pipe DWTT abnormal fracture, sample including rectangular parallelepiped structure, it is provided with groove at the top center of sample, weldering pearl is provided in groove, welds and is provided with linear cutter notch on pearl.Big wall thickness high tenacity X80 steel pipe can be eliminated and DWTT abnormal fracture occur.
Description
Technical field
The invention belongs to toughness of material the field of test technology, and in particular to one kind avoids big wall thickness high tenacity X80 steel pipe
The DWTT sample and its method of DWTT abnormal fracture.
Background technique
Natural gas is a kind of clean energy resource, and a kind of inflammable, explosive danger medium, high pressure gas pipeline are once long
Journey cracking will cause huge difficult calamity and loss, it is therefore necessary to guarantee the safety of pipeline.In order to improve the economy of pipeline,
The trend of natural gas line development is high pressure, heavy caliber, big wall thickness, big throughput rate, and the steel pipe of use is also (high-strength to Hi-grade steel therewith
Degree rank) direction develops.China's natural gas line pipe line steel pipe develops very fastly in recent years, and X70 rank steel pipe is in western gas east
After defeated line successful application, the great pipeline engineering such as the second west to east gas pipeline project, three lines, four lines and Sino-Russian eastern line starts to advise greatly in succession
Mould uses the steel pipe of X80 rank.
The section of shear of steel pipe DWTT fracture is the key that can the crackle of judge high-grade pipe high speed extension crack arrest
Technical indicator.However often there is abnormal fracture in the DWTT of X80 high ductility steel tube test.According to the rule of API RP 5L3
Fixed, normal DWTT fracture apperance should be brittleness crack initiation, and then ductility extends.And when there is abnormal fracture, crackle is tried in DWTT
For sample root of notch with toughness crack initiation, the form being broken in subsequent propagation path is brittleness by ductility transmition.According to API 5L/
The regulation of ISO 3183, when abnormal rock-candy structure occurs in DWTT sample, sample should be judged in vain, and need to resample test.
But for high tenacity X80 steel pipe, test the generation of still unavoidable abnormal fracture again, and the significant wastage time and at
This.At present both at home and abroad the generation of DWTT abnormal fracture, influence factor and in terms of, have carried out some research work
Make, but still without generally acknowledged and reliable decision criteria.With the progress that China's arterial pipeline is built, abnormal fracture in DWTT sample
Even more frequently occur.Therefore need to design a kind of improved DWTT sample, to guarantee carrying out high tenacity, big wall thickness X80 steel pipe
When DWTT is tested, crackle is opened in DWTT sample break root brittleness splits then ductility extension.
Once high pressure gas pipeline will cause huge disaster and loss simultaneously long-range extension of cracking.Steel pipe DWTT fracture is cut
Section product is the key technical index that material resists Ductile crack growth ability.But it is big for modern X80 high-intensity and high-tenacity
There are a large amount of abnormal fractures in traditional DWTT test, leads to test failure in wall thickness pipeline steel tube.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that providing one kind avoids big wall
The DWTT sample and its method of thick high tenacity X80 steel pipe DWTT abnormal fracture are eliminated high tenacity (Charpy-V impact power 300J or more),
The generation of abnormal fracture in big wall thickness (wall thickness 20mm or more) X80 steel pipe DWTT test.
The invention adopts the following technical scheme:
A kind of DWTT sample avoiding big wall thickness high tenacity X80 steel pipe DWTT abnormal fracture, the examination including rectangular parallelepiped structure
Sample is provided with groove at the top center of sample, and weldering pearl is provided in groove, welds and is provided with linear cutter notch on pearl.
Specifically, a length of 300 ± 5mm of sample, width is 76 ± 1mm, and wall thickness is steel pipe origianl wall thickness.
Specifically, the top of the groove width is 18 ± 0.05mm, trench depth is 17.5 ± 0.05mm, and channel bottom circular arc is straight
Diameter is
A kind of preparation method avoiding big wall thickness high tenacity X80 steel pipe DWTT abnormal fracture DWTT sample, including following step
It is rapid:
S1, DWTT blank sample is cut along steel pipe transverse and is flattened, process DWTT sample, ditch is processed at the top of sample
Slot, groove is by the way of machining；
S2, run-on tab and spacing board are processed using carbon steel, in the groove dimensions and DWTT sample on run-on tab and spacing board
Groove dimensions it is consistent；
S3, the DWTT sample processed is arranged in a row, is spaced among DWTT sample using spot-welded spacing board,
First is used for striking, the groove and DWTT of run-on tab and spacing board using spot-welded run-on tab on the last one DWTT sample
The groove of sample aligns；
S4, using high-intensitive brittleness welding rod, control welding parameter to carrying out manual welding at sample groove；
After S5, sample are cooling, DWTT sample is separated with spacing board and run-on tab, Zhu Chu will be welded with grinding wheel and sand paper and beaten
Polish it is whole after weldering pearl central marker cutting line.
Specifically, run-on tab and spacing board are rectangular parallelepiped structure, a length of 56mm, width 50mm in step S2, with a thickness of
1~2 times of sample thickness.
Specifically, the DWTT sample processed is arranged in a row with 2~6 for one group in step S3.
Further, DWTT sample is 4.
Specifically, in step S4, welding parameter is specifically, gage of wire 5mm, electric current 230A, voltage 25V, speed 16~
18cm/min, 19~22kJ of heat input, passage 9.
Specifically, after the completion of step S5, using wire cutting mode, machining gap, gap width need to be at cutting line
0.8mm is hereinafter, notch depth 5mm；Then routine DWTT test method is used, the DWTT sample of preparation is tested.
Compared with prior art, the present invention at least has the advantages that
The present invention is a kind of to avoid big wall thickness high tenacity X80 steel pipe from the DWTT sample of DWTT abnormal fracture, abnormal fracture occur
For toughness is presented when DWTT sample crack initiation, then it is changed into a kind of brittle Fracture Characteristics, according to existing standard criterion, quilt
It is defined as ineffective sample, big wall thickness high tenacity X80 tubing itself is risen due to toughness height, traditional pressed notch usually from toughness
It splits.Core of the invention thought is in the stage of crack initiation, the introducing of pearl to be welded by brittleness, linear cutter is as sharp as possible
Crackle, to guarantee brittleness crack initiation, to eliminate abnormal fracture.
Big wall thickness high tenacity X80 steel pipe is avoided the preparation of DWTT abnormal fracture DWTT sample occur invention additionally discloses a kind of
Method, for separating DWTT sample, key of the invention is prefabricated weldering pearl on DWTT sample, the DWTT sample that will be processed
Be one group with multiple and be arranged in a row, weldering pearl prefabricated in this way it is high-efficient, it is prefabricated weldering pearl can be carried out to multiple DWTT samples simultaneously.
Further, the minimum dimension of run-on tab and spacing board, it is necessary to greater than the size of weldering pearl groove, on this basis,
The appropriate size that increases is to guarantee that DWTT sample is connectable to together.
Further, it is arranged in a row with 2~6 for one group, it is prefabricated in this way to weld the high-efficient of pearl, it can be simultaneously to 2~6
It is prefabricated that DWTT sample carries out weldering pearl.
Further, the welding parameter of setting can guarantee the introducing of brittleness weldering pearl.
Further, wire cutting can process tip notch sharp as far as possible, guarantee the introducing of brittle crack.
Further, it can be protected using high-intensitive brittleness welding rod according to welding parameter to manual welding is carried out at sample groove
Card weldering pearl is brittleness.
In conclusion the present invention, which can eliminate big wall thickness high tenacity X80 steel pipe, there is DWTT abnormal fracture.
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Detailed description of the invention
Fig. 1 is sample structure schematic diagram of the present invention, wherein (a) is side view, (b) is main view；
Fig. 2 is run-on tab structural schematic diagram of the present invention；
Fig. 3 is sample scheme of installation of the present invention；
Fig. 4 is present invention welding schematic diagram；
Fig. 5 is sample of the present invention polishing schematic diagram；
Fig. 6 is sample break machining sketch chart of the present invention；
Fig. 7 is routine DWTT fracture surface of sample shape appearance figure；
Fig. 8 is DWTT fracture surface of sample schematic diagram of the present invention.
Wherein: 1. samples；2. run-on tab；3. spot welding；4. spacing board.
Specific embodiment
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
"front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside", " side ", " one end ", " one side " etc.
The orientation or positional relationship of instruction is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of the description present invention and letter
Change description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific orientation construct and
Operation, therefore be not considered as limiting the invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
Fig. 1 and Fig. 3 are please referred to, the present invention is a kind of to avoid big wall thickness high tenacity X80 steel pipe from DWTT abnormal fracture occur
DWTT sample, is process by the way of machining, and groove is provided at the top center of sample 1, is provided in groove
Weld pearl.
Sample 1 is rectangular parallelepiped structure, and a length of 300 ± 5mm, width is 76 ± 1mm, and wall thickness is steel pipe origianl wall thickness.
Groove is processed at the top of sample 1, for groove by the way of machining, the top of the groove width is 18 ± 0.05mm,
Trench depth is 17.5 ± 0.05mm, and channel bottom arc diameter is
Referring to Fig. 2, run-on tab 2 and spacing board 4 are processed using carbon steel, a length of 56mm of run-on tab 2 and spacing board 4 is wide
For 50mm, with a thickness of 1~2 times of 1 thickness of sample.The groove ruler in groove dimensions and sample 1 on run-on tab 2 and spacing board 4
It is very little consistent.
Referring to Fig. 3, the sample 1 processed is arranged in a row (2~6 are one group, are advisable with 4), adopted among sample 1
It is spaced with 3 weld interval plate 4 of spot welding, first welds run-on tab 2 for drawing using spot welding 3 on the last one DWTT sample
Arc, run-on tab 2 and the groove of the groove and sample 1 of spacing board 4 align.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.The present invention being described and shown in usually here in attached drawing is real
The component for applying example can be arranged and be designed by a variety of different configurations.Therefore, below to the present invention provided in the accompanying drawings
The detailed description of embodiment be not intended to limit the range of claimed invention, but be merely representative of of the invention selected
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without creative efforts
The every other embodiment obtained, shall fall within the protection scope of the present invention.
Referring to Fig. 4, being carried out by hand according to welding parameter shown in table 1 at sample groove using high-intensitive brittleness welding rod
Welding can guarantee that weldering pearl is brittleness according to this welding parameter, and welding process is as shown in Figure 4.
1 welding parameter of table
Referring to Fig. 5, DWTT sample 1 is separated with spacing board 4 and run-on tab 2, after sample is cooling with grinding wheel and sand paper
In weldering pearl central marker cutting line after weldering Zhu Chu is polished flat.
Referring to Fig. 6, machining gap, gap width need to be in 0.8mm hereinafter, notch at cutting line using wire cutting mode
Depth 5mm.
Fig. 7 and Fig. 8 are please referred to, using conventional DWTT test method, the DWTT sample manufactured according to this method is tried
It tests, sample hammer its fracture of having no progeny is positive normal off mouth.High-volume examination is carried out with OD1422 21.4mm thickness X80 steel pipe to Sino-Russian eastern line
It tests, tests the Charpy-V impact power of steel pipe all in 300J or more, when using routine DWTT sample, 98% or more DWTT sample is disconnected
Mouth is all abnormal fracture, as shown in fig. 7, ineffective sample should be judged to.When using the present invention in improved DWTT sample after, 99% with
On DWTT fracture surface of sample be all positive normal off mouth, sample is effective.
By the Sino-Russian east line 21.4mm wall thickness OD1422X80 steel pipe that produces to different manufacturers, (toughness of steel pipe exists
300J or more) DWTT test is carried out, test is using routine DWTT sample and the improved DWTT sample of the present invention.It is sent out in comparative test
Existing, improved DWTT sample can effectively eliminate abnormal fracture in the present invention.
The above content is merely illustrative of the invention's technical idea, and this does not limit the scope of protection of the present invention, all to press
According to technical idea proposed by the present invention, any changes made on the basis of the technical scheme each falls within claims of the present invention
Protection scope within.
Claims (9)
1. a kind of DWTT sample for avoiding big wall thickness high tenacity X80 steel pipe DWTT abnormal fracture, which is characterized in that including cuboid
The sample (1) of structure is provided with groove at the top center of sample (1), and weldering pearl is provided in groove, welds and wired cut is arranged on pearl
Cut machining gap.
2. the DWTT sample according to claim 1 for avoiding big wall thickness high tenacity X80 steel pipe DWTT abnormal fracture, feature
It is, a length of 300 ± 5mm of sample (1), width is 76 ± 1mm, and wall thickness is steel pipe origianl wall thickness.
3. the DWTT sample according to claim 1 for avoiding big wall thickness high tenacity X80 steel pipe DWTT abnormal fracture, feature
It is, the top of the groove width is 18 ± 0.05mm, and trench depth is 17.5 ± 0.05mm, and channel bottom arc diameter is
4. a kind of prepare avoids big wall thickness high tenacity X80 steel pipe DWTT abnormal fracture as described in any one of claims 1 to 3
The method of DWTT sample, which comprises the following steps:
S1, DWTT blank sample is cut along steel pipe transverse and is flattened, process DWTT sample, groove, ditch are processed at the top of sample
Slot is by the way of machining；
S2, run-on tab and spacing board are processed using carbon steel, the ditch in groove dimensions and DWTT sample on run-on tab and spacing board
Slot size is consistent；
S3, the DWTT sample processed is arranged in a row, is spaced among DWTT sample using spot-welded spacing board, first
Striking, the groove and DWTT sample of run-on tab and spacing board are used for using spot-welded run-on tab on the last one DWTT sample
Groove align；
S4, using high-intensitive brittleness welding rod, control welding parameter to carrying out manual welding at sample groove；
After S5, sample are cooling, DWTT sample is separated with spacing board and run-on tab, is polished flat with grinding wheel and sand paper by Zhu Chu is welded
In weldering pearl central marker cutting line after whole.
5. according to claim 4 avoid big wall thickness high tenacity X80 steel pipe from the DWTT sample of DWTT abnormal fracture occur,
It is characterized in that, in step S2, run-on tab and spacing board are rectangular parallelepiped structure, a length of 56mm, width 50mm, with a thickness of sample thickness
1~2 times of degree.
6. the DWTT sample according to claim 4 for avoiding big wall thickness high tenacity X80 steel pipe DWTT abnormal fracture, feature
It is, in step S3, the DWTT sample processed is arranged in a row with 2~6 for one group.
7. the DWTT sample according to claim 6 for avoiding big wall thickness high tenacity X80 steel pipe DWTT abnormal fracture, feature
It is, DWTT sample is 4.
8. the DWTT sample according to claim 4 for avoiding big wall thickness high tenacity X80 steel pipe DWTT abnormal fracture, feature
It is, in step S4, welding parameter is specifically, gage of wire 5mm, electric current 230A, voltage 25V, 16~18cm/min of speed, heat
19~22kJ of input quantity, passage 9.
9. the preparation side according to claim 4 for avoiding big wall thickness high tenacity X80 steel pipe DWTT abnormal fracture DWTT sample
Method, which is characterized in that after the completion of step S5, machining gap, gap width need to be in 0.8mm at cutting line using wire cutting mode
Hereinafter, notch depth 5mm；Then routine DWTT test method is used, the DWTT sample of preparation is tested.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811607634.8A CN109682658B (en) | 2018-12-27 | 2018-12-27 | DWTT test sample for avoiding DWTT abnormal fracture of large-wall-thickness high-toughness X80 steel pipe and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811607634.8A CN109682658B (en) | 2018-12-27 | 2018-12-27 | DWTT test sample for avoiding DWTT abnormal fracture of large-wall-thickness high-toughness X80 steel pipe and method thereof |
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| Publication Number | Publication Date |
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| CN109682658A true CN109682658A (en) | 2019-04-26 |
| CN109682658B CN109682658B (en) | 2021-06-01 |
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