CN215339373U - Reference block for measuring field hardness of heated surface pipe of power station boiler - Google Patents
Reference block for measuring field hardness of heated surface pipe of power station boiler Download PDFInfo
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- CN215339373U CN215339373U CN202121707548.1U CN202121707548U CN215339373U CN 215339373 U CN215339373 U CN 215339373U CN 202121707548 U CN202121707548 U CN 202121707548U CN 215339373 U CN215339373 U CN 215339373U
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Abstract
The utility model discloses a comparison test block for field hardness measurement of a heated surface pipe of a power station boiler, and belongs to the technical field of hardness detection test blocks. The test block comprises a test block body, wherein the test block body comprises a plurality of connected short-circuit steel pipes, and the wall thicknesses of the short-circuit steel pipes are different; the short-circuit steel pipe comprises a plurality of connected steel pipe tiles, and the hardness of the steel pipe tiles of the same short-circuit steel pipe is different; and a hardness test area subjected to polishing treatment and hardness calibration is arranged on the steel pipe tile. The utility model can be used for calibrating the samples outside the standard specified range and eliminating the errors of different portable Richter hardometers on the test results, thereby accurately guiding the discrimination of the field hardness test results, being independent of the experience and the technical level of an operator and having good application prospect.
Description
Technical Field
The utility model belongs to the technical field of hardness detection test blocks, and relates to a comparison test block for field hardness measurement of a heated surface pipe of a power station boiler.
Background
The heated surface tube is an important component of a power station boiler, the heated surface tube is in a high-temperature environment for a long time during the operation of the boiler, due to the reasons of foreign matter blockage, improper boiler combustion adjustment, inconsistency between the coal type used and the coal type designed and the like, the heated surface tube often has an overtemperature phenomenon, the tube section with serious overtemperature is easy to explode and leak during the operation of a unit, so that the unit is not stopped, the safe operation of the unit is influenced, the heated surface tube with the overtemperature needs to be effectively inspected during the shutdown and overhaul of the unit, whether the performance of the heated surface tube meets the use requirement is judged, the performance of the heated surface tube is generally inspected, the tube cutting and sampling are required to be performed tests such as normal-temperature stretching, hardness test, metallographic test and the like in a laboratory, if the individual heated surface tube has the overtemperature, the tube cutting and sampling can be performed for the test, but a laboratory test method cannot be adopted for the condition that the number of the overtemperature of the heated surface tube is large, a simple and quick inspection method needs to be adopted on site. The data of the reason analysis of the overtemperature pipe bursting of a large number of heated surface pipes can show that the lower limit value of the hardness which is lower than the standard regulation is an obvious performance reduction index after overtemperature, so that a portable Richter hardness tester is adopted on site to perform a hardness test on the pipe section with the overtemperature, and whether the performance of the overtemperature pipe section of the heated surface pipe meets the use requirement can be simply and quickly judged through the hardness test value.
A portable type Leeb hardness tester (a D type impact device) and a laboratory table type Brinell hardness tester are used for carrying out hardness tests on the similar parts of the same boiler heating surface pipe, hardness values are compared, and the hardness test values of the portable type Leeb hardness tester are lower than those of the laboratory table type Brinell hardness tester. According to GB/T17394.1-2014 "hardness test in Metal materials part 1: according to the stipulation of the test method, when a D-shaped impact device is used for carrying out a hardness test, the curvature radius of a test sample is not less than 30mm (namely the outer diameter is not less than 60mm), the minimum thickness (uncoupled) is 25mm, the minimum thickness (coupled) is 3mm, and the minimum mass is 5Kg, while for most boiler heating surface tubes in service, the outer diameter cannot meet the conditions, the thickness range of the boiler heating surface tubes is 4-12 mm, and the boiler heating surface tubes are all in an uncoupled state, so that incorrect test results often appear when the hardness test is carried out on site. In addition, the experimental results of different portable Richter hardnesses have different deviation degrees.
Disclosure of Invention
In order to solve the problems, the utility model aims to provide a reference block for field hardness measurement of a heating surface pipe of a power station boiler, which can be used for calibrating samples outside a standard specified range, eliminating errors of different portable Richter hardometers on experimental results and accurately guiding the judgment of the field hardness test results.
The utility model is realized by the following technical scheme:
the utility model discloses a reference test block for field hardness measurement of a heated surface pipe of a power station boiler, which comprises a test block body, wherein the test block body comprises a plurality of connected short-circuit steel pipes, and the wall thicknesses of the short-circuit steel pipes are different; the short-circuit steel pipe comprises a plurality of connected steel pipe tiles, and the hardness of the steel pipe tiles of the same short-circuit steel pipe is different; and a hardness test area subjected to polishing treatment and hardness calibration is arranged on the steel pipe tile.
Preferably, the material and the heat treatment state of the steel pipe tile are the same as those of the pipe surface to be heated.
Preferably, the roughness Ra of the hardness test area is less than or equal to 2.0 μm, and the polishing depth of the hardness test area is 0.5 mm.
Preferably, the hardness test area is arranged in the middle of the steel pipe tile.
Preferably, still be equipped with on the steel pipe tile and be used for a plurality of mark positions that are used for sign steel pipe tile parameter.
Preferably, the central angles of the plurality of steel pipe tiles of the same short-circuited steel pipe are equal.
Preferably, the thickness of a plurality of steel pipe tiles of the same short-circuit steel pipe is 4-12 mm.
Preferably, the hardness differences of a plurality of steel pipe tiles of the same short-circuit steel pipe are equal and are not more than the lower limit of the standard value.
Preferably, the total mass of the test block body is greater than 5 Kg.
Preferably, the outer diameter of the short-circuit steel pipe is 40-59 mm.
Compared with the prior art, the utility model has the following beneficial technical effects:
the utility model discloses a reference block for field hardness measurement of a heated surface pipe of a power station boiler. When hardness measurement is carried out on site, the steel pipe tile which is closest to the hardness and the wall thickness of the heated surface pipe to be measured is selected, through a hardness test area on the steel pipe tile, the portable Richter hardness tester can carry out a site hardness test, and the numerical deviation of the portable Richter hardness tester can be judged quickly and accurately by comparing the hardness with a hardness numerical value calibrated by a laboratory table-type hardness tester. This test block simple structure, easy to operate, the practicality is strong, can compare, revise the deviation that brings when can carrying out the hardness test to the boiler heating surface pipe with portable richter sclerometer, and does not rely on operator's experience and technical level, has good application prospect.
Further, the material and the heat treatment state of the steel pipe tile are the same as the pipe surface to be heated, so that more accurate comparison numerical values can be obtained.
Furthermore, the hardness test area is arranged in the middle of the steel pipe tile, and a sufficient distance is reserved between the hardness test area and the edge, so that the operation is convenient.
Furthermore, still be equipped with on the steel pipe tile and be used for a plurality of mark positions that are used for sign steel pipe tile parameter, can mark the required parameter of experiment, make things convenient for operating personnel to master information fast accurately.
Furthermore, the central angles of a plurality of steel pipe tiles of the same short-circuit steel pipe are equal, the manufacture is simple, and the specifications are consistent.
Furthermore, the thickness of a plurality of steel pipe tiles of same short circuit steel pipe is 4 ~ 12mm, can satisfy the detection needs of the heated face pipe of different specification thickness.
Further, the total mass of the test block body is more than 5Kg, and the requirement of the detection standard is met.
Further, the external diameter of short circuit steel pipe is 40 ~ 59mm, can satisfy the detection needs of the heated face pipe of different specification external diameters.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the overall structure of a steel pipe tile;
FIG. 3 is a schematic top view of a steel tube tile;
FIG. 4 is a schematic cross-sectional view of a steel pipe tile hardness test zone.
In the figure, 1 is a steel pipe tile, 1-1 is a hardness test area, 1-2 is a first marking position, 1-3 is a second marking position, 1-4 is a third marking position, 1-5 is a tile central angle, 2-1 is a first steel pipe tile, 2-2 is a second steel pipe tile, 2-3 is a third steel pipe tile, 2-4 is a fourth steel pipe tile, 2-5 is a fifth steel pipe tile, 2-6 is a sixth steel pipe tile, 2-7 is a seventh steel pipe tile, 2-8 is an eighth steel pipe tile, 2-9 is a ninth steel pipe tile, 3-1 is a first weld, 3-2 is a second weld, 3-3 is a third weld, 3-4 is a fourth weld, 3-5 is a fifth weld, 3-6 is a sixth weld, 3-7 is a seventh weld, 3-3 is a third weld, 3-3 is a fourth weld, 3-5 is a fifth weld, 3-6 is a sixth weld, 3-7 is a seventh weld, and, 3-8 is an eighth welding seam, 3-9 is a ninth welding seam, 4-1 is a first short-circuit steel pipe, 4-2 is a second short-circuit steel pipe, 4-3 is a third short-circuit steel pipe, 5-1 is a first girth welding seam, 5-2 is a second girth welding seam, and 6 is a test block body.
Detailed Description
The utility model is described in further detail below with reference to the following figures and examples:
referring to fig. 1, the reference block for measuring the field hardness of the heated surface pipe of the utility boiler comprises a block body 6, wherein the block body 6 comprises a plurality of connected short-circuit steel pipes, and the wall thicknesses of the short-circuit steel pipes are different; the short-circuit steel pipe comprises a plurality of connected steel pipe tiles 1, and the hardness of the steel pipe tiles 1 of the same short-circuit steel pipe is different; the steel pipe tile 1 is provided with a hardness test area 1-1 which is subjected to polishing treatment and hardness calibration.
The hardness test area 1-1 is arranged in the middle of the steel pipe tile 1; the roughness Ra of the hardness test area 1-1 is less than or equal to 2.0 mu m, and the polishing depth h of the hardness test area 1-1 is 0.5 mm. The steel pipe tile 1 is also provided with a plurality of marking positions for marking parameters of the steel pipe tile 1.
The central angles of a plurality of steel pipe tiles 1 of the same short-circuit steel pipe are equal; the thickness of a plurality of steel pipe tiles 1 of the same short-circuit steel pipe is 4-12 mm; the hardness differences of a plurality of steel pipe tiles 1 of the same short-circuit steel pipe are equal and are not more than the lower limit of the standard value.
The total mass of the test block body 6 is more than 5 Kg.
The external diameter of short circuit steel pipe is 40 ~ 59 mm.
Preferably, the steel pipe tile 1 has the same material and heat treatment state as the pipe surface to be heated.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
FIG. 1 shows a reference block for in-situ hardness measurement of a heating surface tube of a utility boiler. Referring to FIG. 3, the steel tube tile 1 has a length l of 220mm, a central angle 1-5 α of the tile is 120 °, and has the same material and heat treatment state as the tube of the surface to be heated, and the same or similar outer diameter as the tube of the surface to be heated.
Referring to fig. 2, a hardness test area 1-1, a first marking position 1-2 marked with material, a second marking position 1-3 marked with outer diameter and wall thickness, and a third marking position 1-4 marked with Brinell hardness value measured by a table-type hardness tester are arranged on the outer surface of a steel pipe tile 1. The distance b between the hardness test area 1-1 and the edges of the two sides in the radial direction is 40mm, and the polishing depth h at the circumferential center line of the outer circular surface is 0.5mm, as shown in figure 4; width ofThe radial polishing length l is not required1140mm, and the surface roughness Ra after polishing is less than or equal to 2.0 μm. The test block body 6 is provided with 9 steel pipe tiles 1 according to different thicknesses and hardness, specifically a first steel pipe tile 2-1, a second steel pipe tile 2-2, a third steel pipe tile 2-3, a fourth steel pipe tile 2-4, a fifth steel pipe tile 2-5, a sixth steel pipe tile 2-6, a seventh steel pipe tile 2-7, an eighth steel pipe tile 2-8 and a ninth steel pipe tile 2-9.
The wall thicknesses of the first steel pipe tile 2-1, the second steel pipe tile 2-2 and the third steel pipe tile 2-3 are all 6mm, and the Brinell hardness values of the first steel pipe tile 2-1, the second steel pipe tile 2-2 and the third steel pipe tile 2-3 are respectively 10-15 HB, 5-10 HB and 0-5 HB lower than the lower limit value of the standard requirement.
The wall thicknesses of the fourth steel pipe tile 2-4, the fifth steel pipe tile 2-5 and the sixth steel pipe tile 2-6 are all 9mm, and the Brinell hardness values of the fourth steel pipe tile 2-4, the fifth steel pipe tile 2-5 and the sixth steel pipe tile 2-6 are respectively 10-15 HB, 5-10 HB and 0-5 HB lower than the lower limit value of the standard requirement.
The wall thicknesses of the seventh steel pipe tile 2-7, the eighth steel pipe tile 2-8 and the ninth steel pipe tile 2-9 are all 12mm, and the Brinell hardness values of the seventh steel pipe tile 2-7, the eighth steel pipe tile 2-8 and the ninth steel pipe tile 2-9 are respectively 10-15 HB, 5-10 HB and 0-5 HB lower than the lower limit value of the standard requirement.
When determining the length and the wall thickness of each steel pipe tile 1, the total weight of all the steel pipe tiles 1 is more than 5Kg, which meets the requirement of GB/T17394.1-2014 on the minimum quality of the test sample, according to the following formula:
Kg/m＝(D-δ)×δ×0.02466
in the formula: d, outer diameter/mm; delta-thickness/mm.
The first steel pipe tile 2-1, the second steel pipe tile 2-2 and the third steel pipe tile 2-3 are welded together through a first welding seam 3-1, a second welding seam 3-2 and a third welding seam 3-3 to form a first short-circuit steel pipe 4-1.
The fourth steel pipe tile 2-4, the fifth steel pipe tile 2-5 and the sixth steel pipe tile 2-6 are welded together through a fourth welding seam 3-4, a fifth welding seam 3-5 and a sixth welding seam 3-6 to form a second short-circuit steel pipe 4-2.
And the seventh steel pipe tile 2-7, the eighth steel pipe tile 2-8 and the ninth steel pipe tile 2-9 are welded together through a seventh welding seam 3-7, an eighth welding seam 3-8 and a ninth welding seam 3-9 to form a third short-circuited steel pipe 4-3.
And then welding the first short-circuit steel pipe 4-1 and the second short-circuit steel pipe 4-2, and the second short-circuit steel pipe 4-2 and the third short-circuit steel pipe 4-3 together through the first circumferential weld 5-1 and the second circumferential weld 5-2 respectively to form a complete test block body 6.
The using method comprises the following specific processes:
1) selecting a test block body 6
The test block body 6 corresponding to the material, the outer diameter, the wall thickness and the heat treatment state of the boiler heating surface pipe are selected according to different materials, the outer diameter, the wall thickness and the heat treatment state of the boiler heating surface pipe, the material and the heat treatment state of the selected test block body 6 are the same as those of the test heating surface pipe to be detected, and the outer diameter and the wall thickness of the selected test block body 6 are the same as or similar to those of the test heating surface pipe to be detected.
2) Testing deviation of portable Leeb hardness tester for measuring pipe hardness value of heated surface
The body of the test block 6 is vertically fixed, a portable Leeb hardness tester is used for conducting a hardness test on the hardness test area 1-1 of each steel pipe tile 1 on the test block body 6, a corresponding hardness test value is recorded, and then the recorded hardness test value is compared with Brinell hardness values of the positions 1-4 marked on each steel pipe tile 1 on the test block body 6, so that the deviation of the portable Leeb hardness tester in the process of conducting the hardness test on the heated surface pipe can be judged.
3) Determining Brinell hardness value of boiler heating surface tube
The method comprises the steps of polishing the part of the boiler heating surface pipe for the hardness test, wherein the polishing standard is the same as that of a hardness test area 1-1 of each steel pipe tile 1 on a test block body 6, performing the hardness test on the polished area of the boiler heating surface pipe on site by using a portable Richter hardness tester, recording a hardness test value, and comparing the hardness test value with a hardness test value measured by the portable Richter hardness tester on the test block body 6 to judge the range of Brinell hardness values of the boiler heating surface pipe. And selecting a short circuit with the thickness similar to that of the to-be-detected heated surface tube for the heated surface tube with the thickness different from that of the test block body 6, polishing each hardness test area 1-1 until the thickness of the hardness test area 1-1 is the same as that of the to-be-detected heated surface tube, and then performing hardness test comparison.
It should be noted that the above description is only one embodiment of the present invention, and all equivalent changes of the system described in the present invention are included in the protection scope of the present invention. Persons skilled in the art to which this invention pertains may substitute similar alternatives for the specific embodiments described, all without departing from the scope of the utility model as defined by the claims.
Claims (10)
1. A reference test block for field hardness measurement of a heated surface pipe of a power station boiler is characterized by comprising a test block body (6), wherein the test block body (6) comprises a plurality of connected short-circuit steel pipes, and the wall thicknesses of the short-circuit steel pipes are different; the short-circuit steel pipe comprises a plurality of connected steel pipe tiles (1), and the hardness of the steel pipe tiles (1) of the same short-circuit steel pipe is different; the steel pipe tile (1) is provided with a hardness test area (1-1) which is subjected to polishing treatment and hardness calibration.
2. The reference block for on-site hardness measurement of the heating surface pipe of the utility boiler according to claim 1, wherein the steel pipe tiles (1) are made of the same material and have the same heat treatment state as the pipe surface to be heated.
3. The reference block for the field hardness measurement of the heating surface pipe of the utility boiler according to claim 1, wherein the roughness Ra of the hardness test area (1-1) is less than or equal to 2.0 μm, and the depth of polishing of the hardness test area (1-1) is 0.5 mm.
4. The reference block for in-situ hardness measurement of heated surface tubes of utility boilers, according to claim 1, characterized in that the hardness test area (1-1) is provided in the middle of the steel tube tile (1).
5. The reference block for on-site hardness measurement of the heated surface pipe of the utility boiler according to claim 1, wherein the steel pipe tiles (1) are further provided with a plurality of marking positions for marking parameters of the steel pipe tiles (1).
6. The reference block for in-situ hardness measurement of heated surface tubes of utility boilers according to claim 1, characterized in that the central angles of several steel tube tiles (1) of the same short-circuited steel tube are equal.
7. The reference block for in-situ hardness measurement of the heating surface pipe of the utility boiler according to claim 1, wherein the thickness of the plurality of steel pipe tiles (1) of the same short-circuited steel pipe is 4-12 mm.
8. The reference block for in-situ hardness measurement of the heated surface pipe of the utility boiler according to claim 1, wherein hardness differences of a plurality of steel pipe tiles (1) of the same short-circuit steel pipe are equal and are not more than a lower limit of a standard value.
9. A control block for in-situ hardness measurement of heated surface tubes of utility boilers, according to claim 1, characterized by the total mass of the block body (6) being greater than 5 Kg.
10. The reference block for on-site hardness measurement of the heating surface pipe of the utility boiler according to claim 1, wherein the short-circuit steel pipe has an outer diameter of 40-59 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121707548.1U CN215339373U (en) | 2021-07-26 | 2021-07-26 | Reference block for measuring field hardness of heated surface pipe of power station boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121707548.1U CN215339373U (en) | 2021-07-26 | 2021-07-26 | Reference block for measuring field hardness of heated surface pipe of power station boiler |
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| Publication Number | Publication Date |
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| CN215339373U true CN215339373U (en) | 2021-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121707548.1U Active CN215339373U (en) | 2021-07-26 | 2021-07-26 | Reference block for measuring field hardness of heated surface pipe of power station boiler |
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- 2021-07-26 CN CN202121707548.1U patent/CN215339373U/en active Active
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