CN106769439B - A kind of test method of line steel hot rolling roll bending yield strength - Google Patents
A kind of test method of line steel hot rolling roll bending yield strength Download PDFInfo
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- CN106769439B CN106769439B CN201510800642.4A CN201510800642A CN106769439B CN 106769439 B CN106769439 B CN 106769439B CN 201510800642 A CN201510800642 A CN 201510800642A CN 106769439 B CN106769439 B CN 106769439B
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- G—PHYSICS
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- 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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
Abstract
The present invention relates to a kind of test methods of line steel hot rolling roll bending yield strength, for straight rectangle tensile sample, test yield strength by GB/T 228.1-2010 the method；For not straight rectangular cross section tensile sample, the circular cross section tensile sample of corresponding direction is processed first on the hot-rolled coil of rectangular cross section tensile sample adjacent, and finds out its regulated proportion limit RP50；By not straight rectangular cross section tensile sample, prestretching extends to regulated proportion limit R respectivelyP50After unload, tensile sample is unclamped, then again clamping post-tensioning to be broken, then analyze its yield strength by GB/T 228.1-2010.The present invention tests line steel hot rolling roll bending transverse direction, rolling direction, 30 ° of directions, 45 ° of directions using through thickness rectangular cross section sample, can scientific, accurately evaluate the yield strength of line steel hot rolling roll bending；It solves using the unstability of cold pressing quadratic method in routine test, is the new test method of one kind of line steel hot rolling roll bending yield strength.
Description
Technical field
The present invention relates to mechanics of metal detection technique field more particularly to a kind of surveys of line steel hot rolling roll bending yield strength
Method for testing.
Background technique
GB/T 14164-2013 " petroleum gas delivering pipe hot rolled broad steel strip " regulation, for L485/X70 and following
The steel band and steel plate of rank, tension test should use through thickness rectangular specimen；For L555/X80 and the above rank steel band and
Through thickness rectangular specimen or pole sample can be used in steel plate, tension test.But since pole sample eliminates in process
Superficial layer makes the performance of material change.If superficial layer intensity (hardness) is higher, probe intensity will be reduced after processing；
If superficial layer intensity (hardness) is lower, probe intensity will be increased after processing.And if pipeline steel tube diameter is smaller,
Stretching sample blanks bending angle is big, and pole tensile sample is not straight, it is difficult to ensure that the axle center of sample is straight line after processing, test knot
The accuracy value of fruit must be discussed.Therefore, line steel hot rolling roll bending does that tension test is more scientific, more closes using through thickness rectangular specimen
Reason.
GB/T 14164-2013 is provided simultaneously with proof strength Rt0.5It is strong come the surrender of measuring pipe line steel roll bending
Degree.Rt0.5It is one of most important mechanical performance index of line steel hot rolling coiled sheet, and guarantees that pipeline engineering safe operation must not
The technical parameter that can lack.But since line steel hot rolling roll bending is in bending state, during tension test in extensometer gage length
Deformation practical consist of two parts: first is that the deformation that not straight sample tension flattening generates, the other is the true bullet of sample
Plastic deformation, the not straight sample of uniaxial direct tensile make between measurement result and true value that there is a certain error, Rt0.5Detection
Value fluctuation is big, and detected value is relatively low, directly affects the evaluation effect to line steel hot rolling roll bending yield strength.
Most of the country unit is the line steel hot rolling of rolling direction, 30 ° of directions, 45 ° of directions to sampling direction at present
The not straight rectangle tensile sample of roll bending is all made of and is cold-pressed flat method to measure its Rt0.5To obtain the yield strength of material.
However the stress state of material can be had an impact by carrying out being cold-pressed flat process to sample, and flat have no gauge due to being cold-pressed
Degree, only assesses by rule of thumb, so that there is a certain error between measured value and true value, is embodied in the R measuredt0.5It is worth wave
It is dynamic big, to affect the true evaluation to line steel hot rolling roll bending yield strength.Simultaneously as raising and the wall thickness of grade of steel
Increase, so that the cold pressing of sample is flat to become more and more difficult, the influence to the test of material yield strength becomes further obvious.Cause
How this correctly defines Hi-grade steel, the yield strength of big wall thickness pipeline steel tube is the problem of one for must solving is imminent,
Solving and handle well this problem is one of development and production flow line steel hot-rolled coil key factor.
Through retrieving, the related patents or document report of the setting method in relation to drawing by high temperature rate have very much, such as " pipe line steel
The analysis of measurement errors of Rt0.5 " (welded tube, 2005, N0.1)；" Specimen Flatness of SSAW Pipe unevenness is to regulation general extension stress determination
The influence of value " (welded tube, 1996, N0.6)；" Measurement Error of Specified Total Elongation Strength of Linepipe-purpose Steel and its removing method " (weldering
Pipe, 2007, N0.5)；" West-East National Gas Transmission Project fluctuates big discussion with X70 hot-rolled sheet coil yield strength detected value " (steel research,
2003, N0.6)；" Difference of X80 and X100 grades of pipe line steel yield strengths Rt0.5 and Rp0.2 " (welded tube, 2007,
N0.5)；" stability test of pipe line steel yield strength " (physical and chemical inspection, 2010, N0.10)；Application No. is
Chinese patent " a kind of yield strength of pipeline steel tubes with high steel grade and large wall thickness of (200910010670.0 applying date 2009-03-09)
Measuring method " etc..
In the document of the above-mentioned measuring method about pipe line steel yield strength, some is proposed with RP0.2It is bent as pipe line steel
The performance indicator of intensity is taken, but this uses R with pipe line steel code requirementt0.5It is not kissed as the performance indicator of pipe line steel yield strength
It closes.Using the yield strength etc. for being cold-pressed flat method measurement pipe line steel, shortcoming has illustrated some in the background technology." pipeline
The stability test of steel yield strength " and " a kind of measuring method of yield strength of pipeline steel tubes with high steel grade and large wall thickness " use prestretching
Extend to RP0.01Carry out the yield strength of test line steel hot-rolled coil, disadvantage is that the pipeline of different grade of steels, different wall thickness
Different establish a capital of the proportional limit of steel hot-rolled coil is RP0.01, such prestretching extends to RP0.01The sample that will lead to is not opened up completely
It is flat, and some samples have been more than true proportional limit, to affect the accuracy of yield strength test.Therefore, above-mentioned
Method is used for when the test of pipe line steel yield strength in place of equal Shortcomings.
Summary of the invention
The present invention provides a kind of test methods of line steel hot rolling roll bending yield strength, horizontal to line steel hot rolling roll bending
It is tested to, rolling direction, 30 ° of directions, 45 ° of directions using through thickness rectangular cross section sample, wherein not straight rectangle
The yield strength test of cross section tensile sample is pulled to regulated proportion limit R using pre-P50Method, can science, accurately comment
The yield strength of valence line steel hot rolling roll bending；It solves using the unstability of cold pressing quadratic method in routine test, is pipe line steel
The new test method of one kind of hot-rolled coil yield strength.
In order to achieve the above object, the present invention is implemented with the following technical solutions:
A kind of test method of line steel hot rolling roll bending yield strength, includes the following steps:
1) regulated proportion limit R is setP50；Provide that stress strain curve upper curve section point tangent line and ordinate press from both sides tangent of an angle
Value tan θ2Than the tangent value tan θ of straightway and ordinate angle1When increasing by 50%, i.e. tan θ2=1.5tan θ1When, this point pair
The stress answered is regulated proportion limit RP50；
2) regulated proportion limit RP50Calculation method: by regulated proportion limit RP50Definition it is found that tan θ2=1.5tan
θ1；Due to Et=1/tan θ1, Etan=1/tan θ2, E can be releasedt=1.5Etan, wherein EtFor young's modulus in tension, EtanIt is required
Regulated proportion limit RP50The tangent modulus at place；E is found out according to theoretical calculation firstt, E is then calculated againtanTheoretical value be
Etan=Et/1.5；
3) multiple tangent modulus of elasticity E are set in tensile testing machine operation interfacetanChosen Point stress, program is automatic
Calculate the tangent modulus of elasticity E of Chosen Point stresstanActual value, compare EtanActual value and theoretical value relative error,
If relative error is not more than 3%, the Chosen Point stress is effective；The average value of all significant figure strong points stress is found out, this is average
Value is regulated proportion limit RP50；
4) through thickness rectangular cross section tensile sample of the tested line steel hot rolling rolling machining more than one piece with shoulder is used, no
Equidirectional sample quantities are according to depending on actual conditions；；
5) for straight rectangle tensile sample, yield strength is tested by GB/T 228.1-2010 the method；
6) for not straight rectangular cross section tensile sample, the first hot rolling in rectangular cross section tensile sample adjacent
The circular cross section tensile sample of corresponding direction is processed on roll bending, each direction processes one group of circular cross section tensile sample, often
Group is at least 3；Circular cross section tensile sample is pulled to fracture respectively, and finds out every circular cross section by step 2) and stretches
The regulated proportion limit R of sampleP50(n), take with group circular cross section tensile sample regulated proportion limit RP50(n)Average value conduct
The regulated proportion limit R of the directionP50；
7) by not straight rectangular cross section tensile sample, prestretching extends to regulated proportion limit R respectivelyP50After unload, will draw
Sample release is stretched, then again then clamping post-tensioning analyzes its yield strength by GB/T 228.1-2010 to being broken.
The cupping machine selects the full-automatic tensile testing machine of Zwick Z100 type.
It is described that tangent modulus of elasticity E is set in tensile testing machine operation interfacetanChosen Point stress quantity be 3~20
It is a.
Compared with prior art, the beneficial effects of the present invention are:
Through thickness rectangular cross section sample is used to line steel hot rolling roll bending transverse direction, rolling direction, 30 ° of directions, 45 ° of directions
It is tested, wherein the yield strength test of not straight rectangular cross section tensile sample is pulled to the regulated proportion limit using pre-
RP50Method, can science, accurately evaluate line steel hot rolling roll bending yield strength；It solves in routine test using cold
The unstability of flattening method is the new test method of one kind of line steel hot rolling roll bending yield strength.
Detailed description of the invention
Fig. 1 is regulated proportion limit R on stress strain curve of the present inventionP50Schematic diagram.
Specific embodiment
A kind of test method of line steel hot rolling roll bending yield strength of the present invention, includes the following steps:
1) regulated proportion limit R is setP50；Provide that stress strain curve upper curve section point tangent line and ordinate press from both sides tangent of an angle
Value tan θ2Than the tangent value tan θ of straightway and ordinate angle1When increasing by 50%, i.e. tan θ2=1.5tan θ1When, this point pair
The stress answered is regulated proportion limit RP50；
2) regulated proportion limit RP50Calculation method: by regulated proportion limit RP50Definition it is found that tan θ2=1.5tan
θ1；Due to Et=1/tan θ1, Etan=1/tan θ2, E can be releasedt=1.5Etan, wherein EtFor young's modulus in tension, EtanIt is required
Regulated proportion limit RP50The tangent modulus at place；E is found out according to theoretical calculation firstt, E is then calculated againtanTheoretical value be
Etan=Et/1.5；
3) multiple tangent modulus of elasticity E are set in tensile testing machine operation interfacetanChosen Point stress, program is automatic
Calculate the tangent modulus of elasticity E of Chosen Point stresstanActual value, compare EtanActual value and theoretical value relative error,
If relative error is not more than 3%, the Chosen Point stress is effective；The average value of all significant figure strong points stress is found out, this is average
Value is regulated proportion limit RP50；
4) through thickness rectangular cross section tensile sample of the tested line steel hot rolling rolling machining more than one piece with shoulder is used, no
Equidirectional sample quantities are according to depending on actual conditions；；
5) for straight rectangle tensile sample, yield strength is tested by GB/T 228.1-2010 the method；
6) for not straight rectangular cross section tensile sample, the first hot rolling in rectangular cross section tensile sample adjacent
The circular cross section tensile sample of corresponding direction is processed on roll bending, each direction processes one group of circular cross section tensile sample, often
Group is at least 3；Circular cross section tensile sample is pulled to fracture respectively, and finds out every circular cross section by step 2) and stretches
The regulated proportion limit R of sampleP50(n), take with group circular cross section tensile sample regulated proportion limit RP50(n)Average value conduct
The regulated proportion limit R of the directionP50；
7) by not straight rectangular cross section tensile sample, prestretching extends to regulated proportion limit R respectivelyP50After unload, will draw
Sample release is stretched, then again then clamping post-tensioning analyzes its yield strength by GB/T 228.1-2010 to being broken.
The cupping machine selects the full-automatic tensile testing machine of Zwick Z100 type.
It is described that tangent modulus of elasticity E is set in tensile testing machine operation interfacetanChosen Point stress quantity be 3~20
It is a.
Specific embodiments of the present invention will be further explained with reference to the accompanying drawing:
Proportional limit is the proportional maximum stress of stress and strain, i.e., begins to deviate from load-deformation curve
Stress when straight line is more than after this maximum stress value, and strain and stress is no longer proportional relation, but still is elastic deformation, i.e.,
Former length can also be replied when removing external force.When stress is less than or equal to proportional limit, stress and strain meets Hooke's law, that is, answers
Power is directly proportional to strain.
The meaning of the regulated proportion limit is formulated are as follows:
In formula (1): RP50The one regulated proportion limit, MPa；
FP50The corresponding test force of-regulated proportion limit, N；
So- original cross-sectional area, mm2。
But it is practical on stress strain curve, the stress for beginning to deviate from straight line that point is not measured, measurement deviates certain
The stress of value.The tangent value tan θ of certain point tangent line and ordinate angle on general provision curve2Deviate than straight line portion and indulge and sits
Ticket holder tangent of an angle value tan θ1When increasing by 50%, i.e. tan θ2=1.5tan θ1, then the corresponding stress of point is regulated proportion pole
Limit RP50, as shown in Figure 1.
The present invention is by RP50Definition on stress strain curve, Etan=Et/ 1.5, and use theoretical calculation and actual value phase
The method compared finds out regulated proportion limit RP50。
Following embodiment is implemented under the premise of the technical scheme of the present invention, gives detailed embodiment and tool
The operating process of body, but protection scope of the present invention is not limited to following embodiments.Method therefor is such as without spy in following embodiments
Not mentionleting alone bright is conventional method.
[embodiment]
It is drawn with the through thickness rectangular cross section with shoulder of the line steel hot rolling rolling machining transverse direction, 45 ° of directions tested
Each 3, sample are stretched, while being in the diameter of not straight 45 ° of direction rectangular cross section tensile sample adjacents processing corresponding direction
12.7mm circular cross section tensile sample 3.Specimen coding rule is as follows: the first number is sampling direction: " 9 " are lateral, " 5 "
For 45 ° of directions.Second-order digit is serial number.
For straight lateral rectangle tensile sample, yield strength is tested by GB/T 228.1-2010 the method；
The circular cross section tensile sample in 45 ° of directions is pulled to fracture respectively, and finds out every rounded cross section by step 2)
The regulated proportion limit R of face tensile sampleP50(n), take with group circular cross section tensile sample regulated proportion limit RP50(n)Be averaged
It is worth the regulated proportion limit R as the directionP50.Circular cross section tensile sample results of property is shown in Table 1, it is specified that proportional limit RP50
Test result is shown in Table 2.
1 circular cross section tensile sample mechanical property test result of table
| Test piece number (Test pc No.) | Rt0.5/MPa | RP0.2/MPa | Rm/MPa | A50mm/ % |
| 51 | 558 | 560 | 698 | 27.2 |
| 52 | 577 | 580 | 716 | 25.4 |
| 53 | 591 | 592 | 726 | 25.3 |
2 regulated proportion limit R of tableP50Test result
The then proportional limit R of 45 ° of direction samples of the line steel hot rolling plateP50Average value is (489.9+487.1+489.2)/3
=489MPa.
By the rectangular cross section tensile sample in 45 ° of directions, prestretching extends to regulated proportion limit R respectivelyP50It is unloaded after=489MPa
It carries, tensile sample is unclamped, then again then clamping post-tensioning analyzes its yield strength by GB/T 228.1-2010 to being broken.Examination
It tests and the results are shown in Table 3.
The test result of 3 rectangular cross section sample of table
| Test piece number (Test pc No.) | Rt0.5/MPa | RP0.2/MPa | Rm/MPa | A50mm/ % |
| 91 | 623 | 626 | 788 | 31.9 |
| 92 | 626 | 625 | 774 | 31.0 |
| 93 | 626 | 626 | 779 | 31.0 |
| 51 | 568 | 566 | 740 | 38.2 |
| 52 | 570 | 568 | 738 | 38.2 |
| 53 | 574 | 570 | 750 | 37.2 |
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (3)
1. a kind of test method of line steel hot rolling roll bending yield strength first sets the regulated proportion limit；It is characterized in that, also wrapping
Include following steps:
1) regulated proportion limit R is setP50；Provide the tangent value tan of stress strain curve upper curve section point tangent line and ordinate angle
θ2Than the tangent value tan θ of straightway and ordinate angle1When increasing by 50%, i.e. tan θ2=1.5tan θ1When, point is corresponding answers for this
Power is regulated proportion limit RP50；
2) regulated proportion limit RP50Calculation method: by regulated proportion limit RP50Definition it is found that tan θ2=1.5tan θ1；By
In Et=1/tan θ1, Etan=1/tan θ2, E can be releasedt=1.5Etan, wherein EtFor young's modulus in tension, EtanFor required regulation
Proportional limit RP50The tangent modulus at place；E is found out according to theoretical calculation firstt, E is then calculated againtanTheoretical value, that is, Etan=
Et/1.5；
3) multiple tangent modulus of elasticity E are set in tensile testing machine operation interfacetanChosen Point stress, program calculates automatically
The tangent modulus of elasticity E of Chosen Point stress outtanActual value, compare EtanActual value and theoretical value relative error, if phase
3% is not more than to error, then the Chosen Point stress is effective；The average value of all significant figure strong points stress is found out, which is
For regulated proportion limit RP50；
4) through thickness rectangular cross section tensile sample of the tested line steel hot rolling rolling machining more than one piece with shoulder is used, not Tongfang
To sample quantities according to depending on actual conditions；
5) for straight rectangle tensile sample, yield strength is tested by GB/T 228.1-2010 the method；
6) for not straight rectangular cross section tensile sample, the first hot-rolled coil in rectangular cross section tensile sample adjacent
The circular cross section tensile sample of upper processing corresponding direction, each direction process one group of circular cross section tensile sample, and every group extremely
It is less 3；Circular cross section tensile sample is pulled to fracture respectively, and finds out every circular cross section tensile sample by step 2)
Regulated proportion limit RP50(n), take with group circular cross section tensile sample regulated proportion limit RP50(n)Average value as the party
To regulated proportion limit RP50；
7) by not straight rectangular cross section tensile sample, prestretching extends to regulated proportion limit R respectivelyP50After unload, by stretch try
Sample unclamps, then again then clamping post-tensioning analyzes its yield strength by GB/T 228.1-2010 to being broken.
2. a kind of test method of line steel hot rolling roll bending yield strength according to claim 1, which is characterized in that described
Cupping machine selects the full-automatic tensile testing machine of Zwick Z100 type.
3. a kind of test method of line steel hot rolling roll bending yield strength according to claim 1, which is characterized in that described
Tangent modulus of elasticity E is set in tensile testing machine operation interfacetanChosen Point stress quantity be 3~20.
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| CN110186782A (en) * | 2019-05-23 | 2019-08-30 | 天津钢管制造有限公司 | A kind of calculation method for obtaining titanium alloy tension test and providing breaking elongation |
| CN111650044A (en) * | 2020-05-22 | 2020-09-11 | 中国第一汽车股份有限公司 | Method for testing flanging strain limit of metal plate |
| CN114279829A (en) * | 2021-11-19 | 2022-04-05 | 邯郸钢铁集团有限责任公司 | Method for detecting high-speed tensile curve of quenching distribution steel |
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