CN107014681A - The method of rapid evaluation carbon aluminium-killed steel anti-natural ageing performance - Google Patents
The method of rapid evaluation carbon aluminium-killed steel anti-natural ageing performance Download PDFInfo
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- CN107014681A CN107014681A CN201710161261.5A CN201710161261A CN107014681A CN 107014681 A CN107014681 A CN 107014681A CN 201710161261 A CN201710161261 A CN 201710161261A CN 107014681 A CN107014681 A CN 107014681A
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- room temperature
- natural ageing
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- killed steel
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive 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
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
Abstract
The invention discloses a kind of method of rapid evaluation carbon aluminium-killed steel anti-natural ageing performance, its appraisal procedure is：（1）Elongation is carried out for 7%~9% uniaxial tension to the sample of product to be assessed at room temperature, record is stretched to stress R when 7%~9%P；（2）Sample is toasted, room temperature is cooled to, uniaxial tension is carried out again, initial maximum stress R when recording this stretchingEH；（3）Using baking hardening value BH=REH‑RPAssess the time of anti-natural ageing；BH is in 30~50MPa, and to assess product has the anti-natural ageing performance for being not less than 6 months at room temperature；When BH is less than 30MPa, to assess product has anti-more than 9 months aging performance at room temperature；When BH is higher than 50MPa, the anti-natural ageing time of product at room temperature is assessed less than 3 months.Method of this method by using artificial aging in laboratory, rapidly the anti-natural ageing performance to low-carbon Al killed steel be estimated, this method is simple to operate quick, assesses accurate, effect good.
Description
Technical field
The present invention relates to a kind of alloy property appraisal procedure, when especially a kind of rapid evaluation carbon aluminium-killed steel is anti-natural
The method for imitating performance.
Background technology
Low-carbon Al killed steel still possesses certain at room temperature due to containing free interstitial atom C and/or N in the base
Diffusivity.Although diffusion velocity is very slow, but as long as during time long enough, interstitial atom will be diffused at dislocation, pinning
Dislocation, that is, form KESHI gas mass.Now strip can form elongation strain trace when carrying out punching stretch on surface, influence part
Presentation quality, can not use under the use occasion that Surface Quality requires higher, as waste product, the batch of product can be caused to damage
Lose.Therefore it must be produced in finished product and complete to use in the regular hour, when typically requiring 3~6 months anti-natural
Imitate performance；And during for long distance transportation and some special circumstances, be difficult to ensure.For the different producing line of feature, due to work(
The length of energy section is different, such as zinc-plated without overaging section, even for the continuous annealing producing line for having overaging, due to the length of overaging section
Degree difference and the thermal cycling process difference taken, the influence to interstitial atom existence form is also differed, therefore is accomplished by one
The method of kind, can rapidly can be estimated to the aging resistance of finished product steel belt.
The content of the invention
It is anti-certainly the technical problem to be solved in the present invention is to provide a kind of good rapid evaluation carbon aluminium-killed steel of Evaluated effect
The method of right aging performance.
In order to solve the above technical problems, the appraisal procedure that the present invention is taken is：（1）At room temperature to product to be assessed
It is 7%~9% uniaxial tension that sample, which carries out elongation, and record is stretched to stress R when 7%~9%P；
（2）Sample is toasted, room temperature is cooled to, uniaxial tension is carried out again, initial maximum stress when recording this stretching
REH；
（3）Using baking hardening value BH=REH-RPAssess the time of anti-natural ageing；BH will assess product in 30~50MPa
There is the anti-natural ageing performance for being not less than 6 months at room temperature；When BH is less than 30MPa, to assess product has at room temperature
Anti- more than 9 months aging performance；When BH is higher than 50MPa, the anti-natural ageing time of product at room temperature is assessed less than 3
Month.
Step of the present invention（2）In, baking temperature is 100 ± 5 DEG C, and baking time is 60 ± 2 minutes.
Step of the present invention（2）In, the sample after baking naturally cools to room temperature under normal temperature environment.
Step of the present invention（1）In, the gauge length of sample is 80mm, and the width of parallel-segment is 20 ± 0.1mm.
It is using the beneficial effect produced by above-mentioned technical proposal：The present invention in laboratory by using artificial aging
Method, rapidly the anti-natural ageing performance to low-carbon Al killed steel be estimated, this method is simple to operate quick, assesses accurate
Really, effect is good.
Embodiment
With reference to specific embodiment, the present invention is further detailed explanation.
Embodiment 1：The method of this rapid evaluation carbon aluminium-killed steel anti-natural ageing performance uses following techniques.
Product is assessed for continuous annealing DC01 steel bands, its main by weight composition is：C 0.040%, Mn 0.35%, S 0.010%,
P 0.018%, Als 0.045%, N 40ppm；Performance is after annealing：Yield strength Rp0.2=212MPa, tensile strength Rm=
336MPa.It is the sample that 80mm, the width of parallel-segment are 20mm that gauge length, which is made,；Uniaxial tension is to 7% at room temperature（The growth of gauge length
Part is the 7% of raw footage）When stress RPFor 320MPa；It is then placed within stove and toasts 58 minutes, baking temperature is 100 DEG C；
Room temperature is air-cooled to after taking-up, is stretched again, stretching initial maximum strength stress REHFor 363MPa；Baking hardening value BH=
REH-RP=43MPa, therefore estimate the anti-natural ageing that the steel band is not less than 6 months.Through it is follow-up follow the trail of, detection, the steel band it is anti-
Natural aging time is 7 months.
Embodiment 2：The method of this rapid evaluation carbon aluminium-killed steel anti-natural ageing performance uses following techniques.
Product is assessed for continuous annealing DC01 steel bands, its main by weight composition is：C 0.041%, Mn 0.36%, S 0.009%,
P 0.015%, Als 0.042%, N 35ppm；Performance is after annealing：Yield strength Rp0.2=214MPa, tensile strength Rm=
335MPa.It is the sample that 80mm, the width of parallel-segment are 20mm that gauge length, which is made,；Uniaxial tension is to stress R when 9% at room temperaturePFor
316MPa；It is then placed within stove and toasts 61 minutes, baking temperature is 102 DEG C；Room temperature is air-cooled to after taking-up, is drawn again
Stretch, stretching initial maximum strength stress REHFor 366MPa；Baking hardening value BH=REH-RP=50MPa, therefore estimate the steel band and be not less than
The anti-natural ageing of 6 months.Through follow-up tracking, detection, the anti-natural ageing time of the steel band is 6 months.
Embodiment 3：The method of this rapid evaluation carbon aluminium-killed steel anti-natural ageing performance uses following techniques.
Product is assessed for continuous annealing DC01 steel bands, its main by weight composition is：C 0.035%, Mn 0.20%, S 0.005%,
P 0.015%, Als 0.035%, N 25ppm；Performance is after annealing：Yield strength Rp0.2=195MPa, tensile strength Rm=
332MPa.It is the sample that 80mm, the width of parallel-segment are 19.9mm that gauge length, which is made,；Uniaxial tension is to stress R when 8% at room temperatureP
For 315MPa；It is then placed within stove and toasts 60 minutes, baking temperature is 98 DEG C；Room temperature is air-cooled to after taking-up, is drawn again
Stretch, stretching initial maximum strength stress REHFor 359MPa；Baking hardening value BH=REH-RP=44MPa, therefore estimate the steel band and be not less than
The anti-natural ageing of 6 months.Through follow-up tracking, detection, the anti-natural ageing time of the steel band is 6 months.
Embodiment 4：The method of this rapid evaluation carbon aluminium-killed steel anti-natural ageing performance uses following techniques.
Product is assessed for cover annealing DC01 steel bands, its main by weight composition is：C 0.045%, Mn 0.21%, S 0.013%,
P 0.017%, Als 0.035%, N 35ppm；Performance is after annealing：Yield strength Rp0.2=195MPa, tensile strength Rm=
316MPa.It is the sample that 80mm, the width of parallel-segment are 20.1mm that gauge length, which is made,；Uniaxial tension is to stress R when 8% at room temperatureP
For 301MPa；It is then placed within stove and toasts 60 minutes, baking temperature is 105 DEG C；Room temperature is air-cooled to after taking-up, is drawn again
Stretch, stretching initial maximum intensity level REHFor 315MPa；Baking hardening value BH=REH-RP=14MPa, therefore estimate steel band and possess and be not less than
The anti-natural ageing of 9 months.Through follow-up tracking, detection, the anti-natural ageing time of the steel band is 10 months.
Embodiment 5：The method of this rapid evaluation carbon aluminium-killed steel anti-natural ageing performance uses following techniques.
Product is assessed for cover annealing DC01 steel bands, its main by weight composition is：C 0.050%, Mn 0.19%, S 0.014%,
P 0.017%, Als 0.036%, N 24ppm；Performance is after annealing：Yield strength Rp0.2=194MPa, tensile strength Rm=
317MPa.It is the sample that 80mm, the width of parallel-segment are 20mm that gauge length, which is made,；Uniaxial tension is to stress R when 7.5% at room temperatureP
For 292MPa；It is then placed within stove and toasts 59 minutes, baking temperature is 100 DEG C；Room temperature is air-cooled to after taking-up, is drawn again
Stretch, stretching initial maximum intensity level REHFor 321MPa；Baking hardening value BH=REH-RP=29MPa, therefore estimate steel band and possess and be not less than
The anti-natural ageing of 9 months.Through follow-up tracking, detection, the anti-natural ageing time of the steel band is 9 months.
Embodiment 6：The method of this rapid evaluation carbon aluminium-killed steel anti-natural ageing performance uses following techniques.
Product is assessed for cover annealing DC01 steel bands, its main by weight composition is：C 0.032%, Mn 0.20%, S 0.011%,
P 0.014%, Als 0.042%, N 19ppm；Performance is after annealing：Yield strength Rp0.2=189MPa, tensile strength Rm=
315MPa.It is the sample that 80mm, the width of parallel-segment are 20mm that gauge length, which is made,；Uniaxial tension is to stress R when 8.5% at room temperatureP
For 286MPa；It is then placed within stove and toasts 60 minutes, baking temperature is 100 DEG C；Room temperature is air-cooled to after taking-up, is drawn again
Stretch, stretching initial maximum intensity level REHFor 316MPa；Baking hardening value BH=REH-RP=30MPa, therefore estimate steel band and possess and be not less than
The anti-natural ageing of 6 months.Through follow-up tracking, detection, the anti-natural ageing time of the steel band is 7 months.
Embodiment 7：The method of this rapid evaluation carbon aluminium-killed steel anti-natural ageing performance uses following techniques.
Product is assessed for zinc-plated DX51D+Z steel bands, its main by weight composition is：C 0.040%, Mn 0.17%, S
0.012%, P 0.014%, Als 0.027%, N 34ppm；Performance is after annealing：Yield strength Rp0.2=238MPa, tensile strength Rm
=347MPa.It is the sample that 80mm, the width of parallel-segment are 19.9mm that gauge length, which is made,；Uniaxial tension is to stress when 9% at room temperature
RPFor 308MPa；It is then placed within stove and toasts 62 minutes, baking temperature is 95 DEG C；Room temperature is air-cooled to after taking-up, is carried out again
Stretching, stretching initial maximum intensity level REHFor 372MPa；Baking hardening value BH=REH-RP=64MPa, therefore estimate the anti-nature of the steel band
Aging time is less than 3 months.Through follow-up tracking, detection, the anti-natural ageing time of the steel band is 1 month.
Embodiment 8：The method of this rapid evaluation carbon aluminium-killed steel anti-natural ageing performance uses following techniques.
Product is assessed for zinc-plated DX51D+Z steel bands, its main by weight composition is：C 0.039%, Mn 0.17%, S
0.011%, P 0.013%, Als 0.028%, N 35ppm；Performance is after annealing：Yield strength Rp0.2=241MPa, tensile strength Rm
=346MPa.It is the sample that 80mm, the width of parallel-segment are 20.1mm that gauge length, which is made,；At room temperature uniaxial tension to when 8.5% should
Power RPFor 313MPa；It is then placed within stove and toasts 60 minutes, baking temperature is 99 DEG C；Room temperature is air-cooled to after taking-up, is carried out again
Secondary stretching, stretching initial maximum intensity level REHFor 364MPa；Baking hardening value BH=REH-RP=51MPa, therefore it is anti-certainly to estimate the steel band
Right aging time is less than 3 months.Through follow-up tracking, detection, the anti-natural ageing time of the steel band is 2 months.
Evaluated effect is counted：Certain steel mill carries out anti-natural ageing performance progress using this appraisal procedure to carbon aluminium-killed steel
Assess, 100 batches are assessed altogether；Wherein, 32 crowdes of baking hardening value BH are in 30~50MPa, 29 crowdes of baking hardening value BH ＜ 30MPa,
29 crowdes of baking hardening value BH ＞ 50MPa.Through follow-up tracking, detection, 32 crowdes of BH are respectively provided with 30~50MPa steel plate is not less than 6
The anti-natural ageing performance of individual month；29 batches of steel plates for drying BH ＜ 30MPa are respectively provided with the aging performance of anti-more than 9 months；29 batches of bakings
The anti-natural ageing time of BH ＞ 50MPa steel plates is below 3 months.
Claims (4)
1. a kind of method of rapid evaluation carbon aluminium-killed steel anti-natural ageing performance, it is characterised in that its appraisal procedure is：
（1）Elongation is carried out for 7%~9% uniaxial tension to the sample of product to be assessed at room temperature, recorded when being stretched to 7%~9%
Stress RP；
（2）Sample is toasted, room temperature is cooled to, uniaxial tension is carried out again, initial maximum stress when recording this stretching
REH；
（3）Using baking hardening value BH=REH-RPAssess the time of anti-natural ageing；BH will assess product in 30~50MPa
There is the anti-natural ageing performance for being not less than 6 months at room temperature；When BH is less than 30MPa, to assess product has at room temperature
Anti- more than 9 months aging performance；When BH is higher than 50MPa, the anti-natural ageing time of product at room temperature is assessed less than 3
Month.
2. the method for rapid evaluation carbon aluminium-killed steel anti-natural ageing performance according to claim 1, it is characterised in that：
The step（2）In, baking temperature is 100 ± 5 DEG C, and baking time is 60 ± 2 minutes.
3. the method for rapid evaluation carbon aluminium-killed steel anti-natural ageing performance according to claim 1, it is characterised in that：
The step（2）In, the sample after baking naturally cools to room temperature under normal temperature environment.
4. the method for the rapid evaluation carbon aluminium-killed steel anti-natural ageing performance according to claim 1,2 or 3, its feature
It is：The step（1）In, the gauge length of sample is 80mm, and the width of parallel-segment is 20 ± 0.1mm.
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| CN107604137A (en) * | 2017-08-21 | 2018-01-19 | 河钢股份有限公司邯郸分公司 | A kind of method for simulating three-coat three-baking color coating timeliness |
| CN108929946A (en) * | 2018-07-09 | 2018-12-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Ultra-low carbon baking hardening steel ageing resistance evaluation method |
| CN109632461A (en) * | 2018-10-25 | 2019-04-16 | 合肥河钢新材料科技有限公司 | A kind of household electrical appliances Coil Coating Products aging resistance detection method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107586929A (en) * | 2017-08-21 | 2018-01-16 | 河钢股份有限公司邯郸分公司 | It is a kind of to simulate two methods for applying two baking color coating timeliness |
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| CN108929946A (en) * | 2018-07-09 | 2018-12-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Ultra-low carbon baking hardening steel ageing resistance evaluation method |
| CN109632461A (en) * | 2018-10-25 | 2019-04-16 | 合肥河钢新材料科技有限公司 | A kind of household electrical appliances Coil Coating Products aging resistance detection method |
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Application publication date: 20170804 |