CN109682658B - DWTT test sample for avoiding DWTT abnormal fracture of large-wall-thickness high-toughness X80 steel pipe and method thereof - Google Patents
DWTT test sample for avoiding DWTT abnormal fracture of large-wall-thickness high-toughness X80 steel pipe and method thereof Download PDFInfo
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- CN109682658B CN109682658B CN201811607634.8A CN201811607634A CN109682658B CN 109682658 B CN109682658 B CN 109682658B CN 201811607634 A CN201811607634 A CN 201811607634A CN 109682658 B CN109682658 B CN 109682658B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses a DWTT test sample for avoiding a DWTT abnormal fracture of a large-wall-thickness high-toughness X80 steel pipe and a method thereof. The DWTT abnormal fracture of the large-wall-thickness high-toughness X80 steel pipe can be eliminated.
Description
Technical Field
The invention belongs to the technical field of material toughness testing, and particularly relates to a DWTT test sample for avoiding a DWTT abnormal fracture of a large-wall-thickness high-toughness X80 steel pipe and a method thereof.
Background
Natural gas is a clean energy source and is also a flammable and explosive dangerous medium, once a high-pressure natural gas pipeline is cracked for a long time, great disasters and losses are caused, and therefore the safety of the pipeline must be ensured. In order to improve the economical efficiency of pipeline transportation, the development trend of natural gas pipelines is high pressure, large caliber, large wall thickness and large transportation capacity, and the adopted steel pipes are developed towards high steel grade (high strength grade). The development of pipeline steel pipes for natural gas pipelines in China is very fast in recent years, after X70 grade steel pipes are successfully applied to the first east west gas transmission line, the second east gas transmission line, the third east gas transmission line, the fourth east gas transmission line, the middle Russian east line and other heavy pipeline projects begin to use the X80 grade steel pipes in a large scale.
The shearing area of the DWTT fracture of the steel pipe is a key technical index for judging whether the crack of the high-speed expanded crack in the high-steel-grade pipeline can be stopped or not. However, abnormal fractures often appear in DWTT tests of X80 high-toughness steel pipes. According to the specification of API RP 5L3, the normal DWTT fracture morphology should be brittle fracture initiation followed by ductile propagation. When an abnormal fracture occurs, the crack initiates toughness at the root of the notch in the DWTT test piece, and the fracture mode is changed from toughness to brittleness in the subsequent fracture propagation. According to the specification of API 5L/ISO 3183, when the DWTT sample has abnormal brittle fracture, the sample is judged to be invalid, and a resampling test is needed. However, for the high-toughness X80 steel pipe, the generation of abnormal fracture can not be avoided by retesting, and the time and the cost are greatly wasted. At present, some research works are carried out on the aspects of generation, influence factors, evaluation methods and the like of DWTT abnormal fractures at home and abroad, but no accepted and reliable judgment criterion is provided. With the progress of the construction of important pipelines in China, abnormal fractures in DWTT samples appear more frequently. It is therefore desirable to design an improved DWTT specimen to ensure that the crack will initiate brittle fracture at the notched root of the DWTT specimen and then propagate ductile when subjected to the DWTT test on high toughness, high wall thickness X80 steel pipes.
Once the high-pressure natural gas pipeline is cracked and extended for a long time, huge disasters and losses are caused. The DWTT fracture shearing area of the steel pipe is a key technical index of the ductile crack propagation resistance of the material. However, for modern X80 high-strength high-toughness large-wall-thickness pipeline steel pipes, a large number of abnormal fractures appear in the traditional DWTT test, and the test fails.
Disclosure of Invention
The invention aims to solve the technical problem of providing a DWTT test sample for avoiding the DWTT abnormal fracture of the large-wall-thickness high-toughness X80 steel pipe and a method thereof aiming at the defects in the prior art, and eliminating the generation of the abnormal fracture in the DWTT test of the large-wall-thickness (more than 300J of Charpy impact energy) X80 steel pipe with large wall thickness (more than 20mm of wall thickness).
The invention adopts the following technical scheme:
the utility model provides an avoid DWTT sample of big wall thickness high tenacity X80 steel pipe DWTT abnormal fracture, includes the sample of cuboid structure, and the top center department of sample is provided with the slot, is provided with the weld bead in the slot, is provided with the wire cut processing breach on the weld bead.
Specifically, the length of the sample is 300 +/-5 mm, the width is 76 +/-1 mm, and the wall thickness is the original wall thickness of the steel pipe.
Specifically, the width of the top of the groove is 18 +/-0.05 mm, the depth of the groove is 17.5 +/-0.05 mm, and the diameter of the circular arc at the bottom of the groove is
The preparation method of the DWTT test sample for avoiding the DWTT abnormal fracture of the large-wall-thickness high-toughness X80 steel pipe comprises the following steps:
s1, cutting and flattening a DWTT blank sample along the steel pipe in the transverse direction, processing the DWTT sample, and processing a groove at the top of the sample, wherein the groove is processed in a mechanical processing mode;
s2, processing an arc striking plate and a spacing plate by using carbon steel, wherein the sizes of grooves on the arc striking plate and the spacing plate are consistent with the size of a groove on a DWTT test sample;
s3, arranging the processed DWTT samples into a row, adopting spot welding spacing plates to space the DWTT samples, adopting spot welding arc striking plates to strike arcs on the first DWTT sample and the last DWTT sample, and aligning the grooves of the arc striking plates and the spacing plates with the grooves of the DWTT samples;
s4, adopting a high-strength brittle welding rod, and controlling welding parameters to carry out manual welding on the groove of the sample;
and S5, cooling the sample, separating the DWTT sample from the spacing plate and the arc striking plate, polishing the welding bead by using a grinding wheel and abrasive paper, and marking a cutting line in the middle of the welding bead.
Specifically, in step S2, the arc striking plate and the partition plate are both rectangular structures, the length is 56mm, the width is 50mm, and the thickness is 1-2 times of the thickness of the sample.
Specifically, in step S3, 2 to 6 processed DWTT samples are arranged in a row.
Further, there were 4 DWTT samples.
Specifically, in step S4, the welding parameters include a welding wire diameter of 5mm, a current of 230A, a voltage of 25V, a speed of 16-18 cm/min, a heat input of 19-22 kJ, and a pass of 9.
Specifically, after the step S5 is completed, a notch is machined at the cutting line by adopting a linear cutting method, wherein the width of the notch needs to be less than 0.8mm, and the depth of the notch needs to be 5 mm; the prepared DWTT test specimens were then tested using conventional DWTT test methods.
Compared with the prior art, the invention has at least the following beneficial effects:
according to the DWTT test sample for preventing DWTT abnormal fracture of the large-wall-thickness high-toughness X80 steel pipe, the abnormal fracture presents toughness when the DWTT test sample cracks, and then is converted into brittle fracture characteristic, the DWTT test sample is defined as an invalid test sample according to the existing standard specification, and the large-wall-thickness high-toughness X80 steel pipe is usually toughness cracking due to high toughness. The core idea of the invention is that in the stage of crack initiation, the brittle crack initiation is ensured by introducing the brittle welding bead and processing the crack which is as sharp as possible by wire cutting, thereby eliminating the abnormal fracture.
The invention also discloses a preparation method of the DWTT test sample for avoiding DWTT abnormal fracture of the large-wall-thickness high-toughness X80 steel pipe, which is used for separating the DWTT test sample.
Further, the minimum size of the arc starting plate and the spacing plate must be larger than that of the weld bead groove, and on the basis of the minimum size, the minimum size is increased appropriately to ensure that the DWTT test sample can be connected together.
Further, arrange into one row as a set of 2 ~ 6, the efficient of prefabricated weld bead like this can be simultaneously to 2 ~ 6 DWTT samples weld the bead prefabrication.
Furthermore, the set welding parameters can ensure the introduction of the brittle welding bead.
Furthermore, a notch with a sharp tip as possible can be machined by wire cutting, and the introduction of brittle cracks is guaranteed.
Furthermore, a high-strength brittle welding rod is adopted to manually weld the groove of the sample according to welding parameters, so that the brittleness of the welding bead can be ensured.
In conclusion, the method can eliminate DWTT abnormal fracture of the large-wall-thickness high-toughness X80 steel pipe.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic structural view of a sample of the present invention, wherein (a) is a side view and (b) is a front view;
FIG. 2 is a schematic view of the structure of the arc striking plate of the present invention;
FIG. 3 is a schematic view of a sample installation according to the present invention;
FIG. 4 is a schematic view of the welding of the present invention;
FIG. 5 is a schematic view of sample polishing according to the present invention;
FIG. 6 is a schematic view of notch processing of a sample according to the present invention;
FIG. 7 is a fracture morphology diagram of a conventional DWTT specimen;
FIG. 8 is a schematic view of a fracture of a DWTT specimen of the present invention.
Wherein: 1. a sample; 2. an arc striking plate; 3. spot welding; 4. a partition plate.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "one side", "one end", "one side", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 and 3, the DWTT test sample for avoiding the DWTT abnormal fracture of the large-wall-thickness high-toughness X80 steel pipe is processed by a machining method, a groove is arranged at the center of the top of the test sample 1, and a welding bead is arranged in the groove.
Machining a groove at the top of the sample 1, wherein the groove is machined, the width of the top of the groove is 18 +/-0.05 mm, the depth of the groove is 17.5 +/-0.05 mm, and the diameter of an arc at the bottom of the groove is
Referring to fig. 2, the arc ignition plate 2 and the spacing plate 4 are made of carbon steel, the length of the arc ignition plate 2 and the spacing plate 4 is 56mm, the width of the arc ignition plate is 50mm, and the thickness of the arc ignition plate is 1-2 times of the thickness of the sample 1. The size of the grooves on the arc ignition plate 2 and the spacing plate 4 is consistent with that of the grooves on the sample 1.
Referring to fig. 3, the processed test samples 1 are arranged in a row (2-6 are in a group, preferably 4), the middle of the test sample 1 is spaced by welding a spacing plate 4 by using spot welding 3, the first and last DWTT test samples are spaced by welding an arc striking plate 2 by using spot welding 3, and grooves of the arc striking plate 2 and the spacing plate 4 are aligned with grooves of the test sample 1.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 4, a high-strength brittle welding rod is used to manually weld the groove of the sample according to the welding parameters shown in table 1, and the welding process is shown in fig. 4.
TABLE 1 welding parameters
Referring to fig. 5, after the test piece is cooled, the DWTT test piece 1 is separated from the partition plate 4 and the arc striking plate 2, and the welding bead is polished flat by a grinding wheel and sand paper, and then a cutting line is marked in the middle of the welding bead.
Referring to fig. 6, a line cutting method is adopted to process a notch at the cutting line, the width of the notch is below 0.8mm, and the depth of the notch is 5 mm.
Referring to fig. 7 and 8, DWTT test specimens manufactured according to the method were tested using a conventional DWTT test method, and their fractures were normal after the specimens were fractured by hammering. When a large number of experiments are carried out on OD142221.4 mm thick X80 steel pipes used in the middle and Russian east, the Charpy impact work of the experimental steel pipes is more than 300J, and more than 98% of DWTT sample fractures are abnormal fractures when a conventional DWTT sample is adopted, and the experimental steel pipes are judged to be invalid samples as shown in figure 7. After the improved DWTT sample is adopted, more than 99% of DWTT sample fractures are normal fractures, and the sample is effective.
The DWTT test is carried out on the middle and Russian east wires produced by different manufacturers by using 21.4mm wall thickness OD1422X80 steel pipes (the toughness of the steel pipes is more than 300J), and the test adopts a conventional DWTT test sample and a DWTT test sample improved by the invention. In a comparative test, the improved DWTT test sample can effectively eliminate abnormal fractures.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (9)
1. The utility model provides an avoid DWTT sample of big wall thickness high tenacity X80 steel pipe DWTT unusual fracture which characterized in that, includes sample (1) of cuboid structure, and the top center department of sample (1) is provided with the slot, and the slotted is provided with the weld bead, is provided with the wire cut processing breach on the weld bead.
2. The DWTT test specimen for avoiding the DWTT abnormal fracture of the large-wall-thickness high-toughness X80 steel pipe according to claim 1, wherein the length of the test specimen (1) is 300 +/-5 mm, the width of the test specimen is 76 +/-1 mm, and the wall thickness is the original wall thickness of the steel pipe.
3. The DWTT test specimen for avoiding the DWTT abnormal fracture of the X80 steel pipe with large wall thickness and high toughness as claimed in claim 1, wherein the groove top is provided with a grooveThe width of the groove part is 18 +/-0.05 mm, the depth of the groove is 17.5 +/-0.05 mm, and the diameter of the circular arc at the bottom of the groove is
4. A method for preparing DWTT test samples for avoiding DWTT abnormal fracture of large-wall-thickness high-toughness X80 steel pipes according to any one of claims 1 to 3, which is characterized by comprising the following steps:
s1, cutting and flattening a DWTT blank sample along the steel pipe in the transverse direction, processing the DWTT sample, and processing a groove at the top of the sample, wherein the groove is processed in a mechanical processing mode;
s2, processing an arc striking plate and a spacing plate by using carbon steel, wherein the sizes of grooves on the arc striking plate and the spacing plate are consistent with the size of a groove on a DWTT test sample;
s3, arranging the processed DWTT samples into a row, adopting spot welding spacing plates to space the DWTT samples, adopting spot welding arc striking plates to strike arcs on the first DWTT sample and the last DWTT sample, and aligning the grooves of the arc striking plates and the spacing plates with the grooves of the DWTT samples;
s4, adopting a high-strength brittle welding rod, and controlling welding parameters to carry out manual welding on the groove of the sample;
and S5, cooling the sample, separating the DWTT sample from the spacing plate and the arc striking plate, polishing the welding bead by using a grinding wheel and abrasive paper, and marking a cutting line in the middle of the welding bead.
5. The method according to claim 4, wherein in step S2, the arc striking plate and the spacing plate are both rectangular parallelepiped structures, and have a length of 56mm, a width of 50mm, and a thickness of 1-2 times of the sample thickness.
6. The method of claim 4, wherein in step S3, the processed DWTT samples are arranged in a row of 2-6 samples.
7. The method of claim 6, wherein there are 4 DWTT samples.
8. The method of claim 4, wherein in step S4, the welding parameters are welding wire diameter 5mm, current 230A, voltage 25V, speed 16-18 cm/min, heat input 19-22 kJ, and pass 9.
9. The method according to claim 4, wherein after step S5, a notch is machined at the cutting line by using a line cutting method, wherein the width of the notch is less than 0.8mm, and the depth of the notch is 5 mm; the prepared DWTT test specimens were then tested using conventional DWTT test methods.
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| 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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