CN106370535A - Tempering hardness conversion method of P92 steel - Google Patents
Tempering hardness conversion method of P92 steel Download PDFInfo
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- CN106370535A CN106370535A CN201610773183.XA CN201610773183A CN106370535A CN 106370535 A CN106370535 A CN 106370535A CN 201610773183 A CN201610773183 A CN 201610773183A CN 106370535 A CN106370535 A CN 106370535A
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- brinell hardness
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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
- G01N3/40—Investigating hardness or rebound hardness
-
- 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
-
- 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
- G01N1/32—Polishing; Etching
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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
- G01N2001/2866—Grinding or homogeneising
-
- 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
- G01N2203/0076—Hardness, compressibility or resistance to crushing
- G01N2203/0078—Hardness, compressibility or resistance to crushing using indentation
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- Life Sciences & Earth Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Pathology (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention provides a tempering hardness conversion method of P92 steel. The method comprises the following steps: intercepting a plurality of test samples in the same position of a P92 steel pipe, and after carrying out normalizing treatment on the test samples, carrying out different tempering treatment processes by regulating the tempering temperature and time, thereby obtaining P92 steel test samples with different tempering hardnesses; after respectively carrying out grinding and polishing on the obtained P92 steel test sample surface, measuring the actual Brinell hardness of the P92 steel test sample by a table Brinell hardness tester, and measuring the Brinell hardness of the P92 steel test sample by a Leeb hardness tester; establishing an HBHLD-HBW comparison diagram by using the measured Brinell hardness as the vertical coordinates and the actual Brinell hardness as the horizontal ordinates, and carrying out linear regression to obtain a linear relation HBHLD=20.6+0.84*HBW; and after measuring the Brinell hardness of the P92 steel test sample by the Leeb hardness tester, obtaining the actual Brinell hardness of the measured P92 steel test sample according to the linear relation.
Description
Technical field
The present invention relates to a kind of p92 steel belt roof bolt hardness conversion method, belong to p92 steel heat treatment technical field.
Background technology
P92 steel has excellent elevated temperature strength, good antioxygenic property and thermal physical property parameter, is Chinese ultra supercritical
The main application steel grade of unit, it is used primarily in main steam line and reheaing steam pipe.Because hardness determination does not need to destroy
Workpiece, in engineering site close to " lossless " detection, the main performance that tempering hardness also becomes examination p92 steel in Practical Project refers to
One of mark, and in some cases, hardness is also the performance indications uniquely characterizing this steel grade.The hardness of p92 steel is checked and accepted logical
Often it is defined by Brinell hardness (hbw) value, but the limitation because of brineling, Site Detection is entered using Leeb Hardness Tester mostly
OK, then according still further to intrinsic conversion relation in Leeb Hardness Tester, lee ' hardness value (hld) is scaled corresponding Brinell hardness
It is worth (hbhld) as acceptance basis, but because the conversion relation in Leeb Hardness Tester suffers from the shadow of the other factors such as steel grade
Ring, and then lead to the hardness number of different steel grades to there is deviation when carrying out hardness conversion, check and accept in p92 steel and often produce some points
Discrimination.When there is difference to Hardness results, can be by being sampled to detected workpiece, in its Bu Shi of test in laboratory
Hardness (hbw), and using this Brinell hardness as final hardness result, but the method needs to destroy workpiece.
Therefore, it is necessary to the Brinell hardness (hbhld) that the Leeb Hardness Tester setting up p92 steel records is with actual Brinell hardness
(hbw) relation between.
Content of the invention
In order to solve above-mentioned shortcoming and defect, it is an object of the invention to provide a kind of p92 steel belt roof bolt hardness conversion
Method.
For reaching above-mentioned purpose, the present invention provides a kind of p92 steel belt roof bolt hardness conversion method, and it comprises the following steps:
(1), the same position in p92 steel pipe intercepts multiple test specimens, described test specimen is carried out after normalizing process process, then leads to
Cross adjustment temper temperature and time so that different temper are carried out to it, obtain the p92 steel with different tempering hardnesses
Test specimen；
(2) after, the p92 steel surface of test piece that step (1) obtains being ground respectively and polishes, using desk-top Brinell hardness
Measure the actual Brinell hardness (hbw) obtaining this p92 steel test specimen, record the Brinell hardness of this p92 steel test specimen using Leeb Hardness Tester
(hbhld)；
(3), with step (2) institute brinelling as vertical coordinate, actual Brinell hardness is abscissa, sets up hbhld-hbw
Comparison diagram, then linear relation: hbhld=20.6+0.84 × hbw is obtained by linear regression；
(4), record the Brinell hardness of p92 steel test specimen to be measured using Leeb Hardness Tester after, according to linear described in step (3)
Relational expression conversion obtains the actual Brinell hardness of this p92 steel test specimen to be measured.
According to method of the present invention it is preferable that the thickness of described test specimen is all between 25-30mm.
According to method of the present invention it is preferable that the described normalizing process of step (1) sequentially includes the following steps: 1065 DEG C
Air cooling after being incubated 45 minutes.
According to method of the present invention it is preferable that the described temper of step (1) sequentially includes the following steps: 740-790
DEG C insulation 15-360 minute after air cooling.
According to method of the present invention it is preferable that the measurement of the described actual Brinell hardness of step (2) includes following step
Rapid:
According to the requirement of gb/t231.1-2009 " metal material Brinell hardness test ", using the measurement of desk-top Brinell hardness tester
The actual Brinell hardness of each test specimen, wherein, each test specimen measure 3 points and take three point hardnesses meansigma methodss be this test specimen reality
Border Brinell hardness, its test condition is φ 5mm pressure head, loaded load 750kg, and the load time is 10s.
According to method of the present invention it is preferable that step (2) is described records this p92 steel test specimen using Leeb Hardness Tester
Brinell hardness comprise the following steps:
According to the requirement of gb/t17394.1-2014 " test of metal material lee ' hardness ", every using Leeb Hardness Tester measurement
The Brinell hardness of individual test specimen, wherein, measured position is 5- around selected 3 points of Brinell when testing actual Brinell hardness
10mm, test around each impression 5 points of ball hardness numbers and take 5 point hardnesses meansigma methodss be this Brinell Bu Shi
Hardness, then take 3 points of Brinell hardness meansigma methodss be this test specimen Brinell hardness.
According to method of the present invention, the desk-top Brinell hardness tester used by the present invention and Leeb Hardness Tester are this area
The conventional equipment using.
Brinell hardness (hbhld) and actual Brinell hardness (hbw) that the present invention records to the Leeb Hardness Tester of p92 steel test specimen
All measured, established between the same Brinell hardness of the Brinell hardness (hbhld) (hbw) that the Leeb Hardness Tester of p92 steel records
More accurate hardness conversion relation, can solve Brinell hardness (hbhld) that engineering site Leeb Hardness Tester records with true
The offset issue existing between real Brinell hardness (hbw), reduces difference.
The present invention is tested by a series of p92 temper, draws the different hardness distribution of p92 steel, measures its Bu Shi hard
Degree, and according to related standard, measure corresponding lee ' hardness (hld) afterwards according to intrinsic conversion relation in Leeb Hardness Tester
It is scaled Brinell hardness (hbhld), set up the relation with Brinell hardness for the lee ' hardness of p92 steel, the hardness test of engineering site
Hardness (hbhld) can be checked by Brinell hardness tester, afterwards actual Brinell hardness (hbw) is scaled by this relational expression, press
The hardness number of sighting target alignment request carries out an acceptance inspection.
Brief description
Fig. 1 is the Brinell hardness (hbhld) and actual cloth that the Leeb Hardness Tester of p92 steel test specimen in the embodiment of the present invention records
Graph of relation between family name's hardness (hbw).
Specific embodiment
In order to be more clearly understood to the technical characteristic of the present invention, purpose and beneficial effect, in conjunction with detail below
Embodiment and Figure of description technical scheme is carried out described further below, but it is not intended that to the present invention can
The restriction of practical range.
Embodiment 1
Present embodiments provide a kind of p92 steel belt roof bolt hardness conversion method, it comprises the following steps:
(1), the same position in p92 steel pipe intercepts multiple test specimens (in embodiment, totally 10 test specimens, is numbered m0- respectively
M7, m0b1, m0b2), the thickness of described test specimen is 30mm；Described test specimen is carried out after normalizing process process, then by adjustment
Temper temperature and time, to carry out different temper to it, obtains the p92 steel test specimen with different tempering hardnesses；On
The heat treatment process parameter stating ten test specimens is as shown in table 1 below.
Table 1
(2), after, having carried out normalizing process process and temper, the p92 steel surface of test piece that step (1) obtains is adopted respectively
After being ground and polished with sand paper and buffing machine, the actual Bu Shi recording this p92 steel test specimen using desk-top Brinell hardness tester is hard
Degree (hbw), records the Brinell hardness (hbhld) of this p92 steel test specimen using Leeb Hardness Tester；
The measurement of described actual Brinell hardness comprises the following steps:
According to the requirement of gb/t231.1-2009 " metal material Brinell hardness test ", using the measurement of desk-top Brinell hardness tester
The actual Brinell hardness of each test specimen, wherein, each test specimen measure 3 points and take three point hardnesses meansigma methodss be this test specimen reality
Border Brinell hardness, its test condition is φ 5mm pressure head, loaded load 750kg, and the load time is 10s.
Described comprised the following steps using the Brinell hardness that Leeb Hardness Tester records this p92 steel test specimen:
According to the requirement of gb/t17394.1-2014 " test of metal material lee ' hardness ", every using Leeb Hardness Tester measurement
The Brinell hardness of individual test specimen, wherein, measured position is 5- around selected 3 points of Brinell when testing actual Brinell hardness
10mm, test around each impression 5 points of ball hardness numbers and take 5 point hardnesses meansigma methodss be this Brinell Bu Shi
Hardness, then take 3 points of Brinell hardness meansigma methodss be this test specimen Brinell hardness.
Additionally, for the relation investigating sample room-temperature mechanical property and hardness under different heat treatment technique, in the present embodiment
Also tension test and impact test have been carried out respectively to this ten test specimens of m0-m7, m0b1, m0b2.Result of the test is shown in Table 2.
Table 2
As shown in Table 2, hardness is consistent with the variation tendency of intensity, and that is, the corresponding intensity of the high sample of hardness is also high；Impact
The variation tendency absorbing work(with intensity is in changing inversely, and that is, the corresponding intensity of the high sample of impact absorbing energy is relatively low.
It can also be seen that the actual ball hardness number (hbw) of the different test specimens of contrast is with being changed with lee ' hardness from table 2
The difference of ball hardness number (hbhld) is it is found that for p92 steel, in all hardness ranges, changed with lee ' hardness
Ball hardness number (hbhld) all little than real Brinell hardness (hbw) value.
(3), with step (2) institute brinelling as vertical coordinate, actual Brinell hardness is abscissa, sets up hbhld-hbw
Comparison diagram is (as shown in figure 1, the corresponding hardness of m4n and m5n is before the sample that numbering is m4 and m5 is tempered after normalizing in Fig. 1
Hardness number), then linear relation: hbhld=20.6+0.84 × hbw is obtained by linear regression；
(4), record the Brinell hardness of p92 steel test specimen to be measured using Leeb Hardness Tester after, according to linear described in step (3)
Relational expression obtains the actual Brinell hardness of this p92 steel test specimen to be measured.
Claims (6)
1. a kind of p92 steel belt roof bolt hardness conversion method, it comprises the following steps:
(1), the same position in p92 steel pipe intercepts multiple test specimens, and described test specimen is carried out after normalizing process process, then by adjusting
Whole temper temperature and time, to carry out different temper to it, obtains the p92 steel test specimen with different tempering hardnesses；
(2), after, the p92 steel surface of test piece that step (1) obtains being ground respectively and polishes, measured using desk-top Brinell hardness
Obtain the actual Brinell hardness of this p92 steel test specimen, record the Brinell hardness of this p92 steel test specimen using Leeb Hardness Tester；
(3), with step (2) institute brinelling as vertical coordinate, actual Brinell hardness is abscissa, sets up hbhld-hbw contrast
Figure, then linear relation: hbhld=20.6+0.84 × hbw is obtained by linear regression；
(4), record the Brinell hardness of p92 steel test specimen to be measured using Leeb Hardness Tester after, according to the linear relationship described in step (3)
Formula conversion obtains the actual Brinell hardness of this p92 steel test specimen to be measured.
2. method according to claim 1 is it is characterised in that the thickness of described test specimen is all between 25-30mm.
3. method according to claim 1 is it is characterised in that the described normalizing process of step (1) sequentially includes the following steps:
1065 DEG C insulation 45 minutes after air cooling.
4. method according to claim 1 is it is characterised in that the described temper of step (1) sequentially includes the following steps:
Air cooling after 740-790 DEG C of insulation 15-360 minute.
5. method according to claim 1 it is characterised in that the measurement of the described actual Brinell hardness of step (2) include with
Lower step:
According to the requirement of gb/t231.1-2009 " metal material Brinell hardness test ", each is measured using desk-top Brinell hardness tester
The actual Brinell hardness of test specimen, wherein, each test specimen measure 3 points and take three point hardnesses meansigma methodss be this test specimen actual cloth
Family name's hardness, its test condition is φ 5mm pressure head, loaded load 750kg, and the load time is 10s.
6. method records this it is characterised in that step (2) is described using Leeb Hardness Tester according to claim 1 or 5
The Brinell hardness of p92 steel test specimen comprises the following steps:
According to the requirement of gb/t17394.1-2014 " test of metal material lee ' hardness ", each examination is measured using Leeb Hardness Tester
The Brinell hardness of part, wherein, measured position is 5- around selected 3 points of Brinell when testing actual Brinell hardness
10mm, test around each impression 5 points of ball hardness numbers and take 5 point hardnesses meansigma methodss be this Brinell Bu Shi
Hardness, then take 3 points of Brinell hardness meansigma methodss be this test specimen Brinell hardness.
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| CN201610773183.XA CN106370535A (en) | 2016-08-30 | 2016-08-30 | Tempering hardness conversion method of P92 steel |
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| CN201610773183.XA CN106370535A (en) | 2016-08-30 | 2016-08-30 | Tempering hardness conversion method of P92 steel |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108398455A (en) * | 2018-03-05 | 2018-08-14 | 国电锅炉压力容器检验中心 | The assay method of ductile-brittle transition temperature |
| CN109406322A (en) * | 2018-09-14 | 2019-03-01 | 华电电力科学研究院有限公司 | Live hardness determination Piglet s colibacillosis method |
| CN110231239A (en) * | 2018-05-07 | 2019-09-13 | 上海明华电力技术工程有限公司 | A kind of lee ' hardness detection error modification method |
| CN113176160A (en) * | 2021-03-26 | 2021-07-27 | 国能锅炉压力容器检验有限公司 | Uniform-velocity rebound hardness test method based on average impact rebound velocity measurement |
| CN113376040A (en) * | 2021-05-08 | 2021-09-10 | 广东省特种设备检测研究院 | Conversion method for Leeb hardness and Brinell hardness of heat-resistant steel |
| CN113390741A (en) * | 2020-03-13 | 2021-09-14 | 中核苏阀科技实业股份有限公司 | Method for indirectly detecting real hardness of gate valve flashboard finished product sealing surface |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108398455A (en) * | 2018-03-05 | 2018-08-14 | 国电锅炉压力容器检验中心 | The assay method of ductile-brittle transition temperature |
| CN110231239A (en) * | 2018-05-07 | 2019-09-13 | 上海明华电力技术工程有限公司 | A kind of lee ' hardness detection error modification method |
| CN110231239B (en) * | 2018-05-07 | 2022-04-01 | 上海明华电力科技有限公司 | Method for correcting errors in Leeb hardness detection |
| CN109406322A (en) * | 2018-09-14 | 2019-03-01 | 华电电力科学研究院有限公司 | Live hardness determination Piglet s colibacillosis method |
| CN113390741A (en) * | 2020-03-13 | 2021-09-14 | 中核苏阀科技实业股份有限公司 | Method for indirectly detecting real hardness of gate valve flashboard finished product sealing surface |
| CN113176160A (en) * | 2021-03-26 | 2021-07-27 | 国能锅炉压力容器检验有限公司 | Uniform-velocity rebound hardness test method based on average impact rebound velocity measurement |
| CN113176160B (en) * | 2021-03-26 | 2022-11-08 | 国能锅炉压力容器检验有限公司 | Uniform-velocity rebound hardness test method based on average impact rebound velocity measurement |
| CN113376040A (en) * | 2021-05-08 | 2021-09-10 | 广东省特种设备检测研究院 | Conversion method for Leeb hardness and Brinell hardness of heat-resistant steel |
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