CN112213187A - Method for rapidly testing mechanical property of twisted steel - Google Patents
Method for rapidly testing mechanical property of twisted steel Download PDFInfo
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- CN112213187A CN112213187A CN202010904844.4A CN202010904844A CN112213187A CN 112213187 A CN112213187 A CN 112213187A CN 202010904844 A CN202010904844 A CN 202010904844A CN 112213187 A CN112213187 A CN 112213187A
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- cooling
- twisted steel
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- rapidly
- mechanical property
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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
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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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
- G01N3/28—Investigating ductility, e.g. suitability of sheet metal for deep-drawing or spinning
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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
-
- 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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0228—Low temperature; Cooling means
Abstract
The invention belongs to the technical field of smelting, and particularly relates to a method for rapidly testing the mechanical properties of a threaded steel bar, which is characterized in that a hot-rolled threaded steel bar with the lower cooling bed temperature of less than or equal to 430 ℃ is adopted, the hot-rolled threaded steel bar is cooled to room temperature by adopting any one of air cooling and normal-temperature water cooling, and then the yield strength, the tensile strength and the elongation percentage of the hot-rolled threaded steel bar are detected.
Description
Technical Field
The invention belongs to the technical field of smelting, and particularly relates to a method for rapidly testing mechanical properties of a twisted steel.
Background
In the production and inspection process of steel products, in order to truly detect the mechanical property of steel at normal temperature and reduce the damage to detection equipment, the mechanical property test of the twisted steel needs to be carried out after a sample is cooled to room temperature.
At present, under the existing process conditions, the deformed bars (HRB400, HRB500) produced by a steel mill are in small specifications after the steel is cooled down in a cooling bed
Cooling to room temperature in natural cooling condition for about 120min
Needs about 180min to cool to room temperature in large specification: (
Above) takes longer. As the time required by the natural cooling time of the deformed steel bars (HRB400 and HRB500) is long, the deformed steel bars cannot be detected and judged in time after being off-line, the outgoing of products and the transportation of logistics are influenced, and the backlog time of steel products in a warehouse area is greatly increased. In addition, the inspection of mechanical properties is delayed, so that the process optimization and adjustment are difficult, measures cannot be made timely and effectively, and waste products generated by improper process adjustment are reduced.
In order to increase the speed of detection, if the high temperature sample is directly detected, the deviation of the detection result is large, in the plastic deformation stage in the tensile test process, because the temperature of the sample is higher, the dynamic recovery occurs, the tensile strength is reduced, meanwhile, the metal tensile test process is also the metal deformation process, the sample begins to generate plastic deformation, namely dislocation inside the sample crystal begins to slip, a large amount of dislocation slips show plastic deformation macroscopically, the dislocation slip is hindered by the second phase particles and the grain boundary, the larger the degree of the hindrance, the larger the force required for dislocation slip, and the more difficult the plastic deformation, however, the high-temperature sample not only weakens the hindrance of the second phase particles and the grain boundary, but also causes the dislocation to climb, weakens the hindrance between the dislocation, and macroscopically shows the reduction of yield strength. Therefore, it is important to find a method for accurately and rapidly detecting the mechanical property of the steel.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for rapidly testing the mechanical property of a twisted steel.
The method is realized by the following technical scheme:
a method for quickly testing the mechanical performance of the twisted steel includes such steps as cooling the hot-rolled twisted steel to room temp by air cooling or water cooling, and testing its yield strength, tension strength and elongation.
The threaded steel bar is HRB400 or HRB 500.
The temperature of the normal temperature water is 15-25 ℃.
The yield strength, the tensile strength and the elongation are detected according to the method of GB/T1499-2007.
And air cooling is carried out, wherein the cooling time is 60-100 min.
And water cooling, wherein the cooling time is 5-10 min.
Has the advantages that:
the invention adopts a water cooling or air cooling mode, is suitable for the rapid and accurate detection of the mechanical property of the steel obtained by the traditional rolling technology, effectively overcomes the inaccuracy problem of direct detection, and simultaneously overcomes the problems of natural cooling and long time consumption.
The method saves the natural cooling time, and can quickly and accurately measure the mechanical property indexes of the yield strength Rel, the tensile strength Rm and the elongation A of the hot-rolled twisted steel bar, compared with the natural cooling, the absolute error of the yield strength Rel is less than or equal to 5MPa, the absolute error of the tensile strength Rm is less than or equal to 5MPa and the absolute error of the elongation A is less than or equal to 3 percent in the quick cooling mode, thereby ensuring that the natural cooling and the quick cooling samples have good property correspondence.
The cooling time of air cooling is 60-100min, the cooling time of water cooling is 5-10min, and the cooling time under natural conditions is 120-240 min.
Detailed Description
The following is a detailed description of the embodiments of the present invention, but the present invention is not limited to these embodiments, and any modifications or substitutions in the basic spirit of the embodiments are included in the scope of the present invention as claimed in the claims.
Example 1
A method for rapidly testing the mechanical property of a twisted steel comprises the following steps:
(1) 10 batches of HRB400 and HRB500 twisted steel bars with the same specification are taken
Naturally cooling hot-rolled twisted steel bars of different batches to room temperature after rolling to be used as a comparison sample;
(2) rapidly cooling the hot-rolled twisted steel to room temperature by adopting an air cooling mode, testing the yield strength Rel, the tensile strength Rm and the elongation A of the corresponding sample batch, and taking the average value of 2 samples;
(3) rapidly cooling the hot-rolled twisted steel to room temperature by adopting a water cooling mode, testing the yield strength Rel, the tensile strength Rm and the elongation A of the corresponding sample batch, and taking the average value of 2 samples;
the mechanical properties were measured according to GB/T1499-2007, and the results are shown in tables 1-3;
TABLE 1 Performance under Natural Cooling conditions
TABLE 2 Performance under air and Water Cooling conditions
TABLE 3 Absolute error of mechanical Properties under air-and water-cooled conditions, compared to Natural Cooling
As can be seen from the table, the natural cooling, the lower cooling bed temperature: cooling to the normal temperature at 230 ℃: 120 min; air-cooled cooling lower cooling bed temperature: cooling to the normal temperature at 230 ℃: the response of the natural cooling and the air cooling of the mechanical property of the twisted steel is good after 60min, the absolute error of the yield strength Rel is less than or equal to 5MPa, the absolute error of the tensile strength Rm is less than or equal to 5MPa, and the absolute error of the elongation A is less than or equal to 3 percent; cooling by water cooling the lower cooling bed temperature: cooling to the normal temperature at 230 ℃: and 5min, the corresponding performance of the natural cooling and the water cooling of the mechanical property of the deformed steel bar is good, the absolute error of the yield strength Rel is less than or equal to 5MPa, the absolute error of the tensile strength Rm is less than or equal to 5MPa, and the absolute error of the elongation A is less than or equal to 3%.
Example 2
A method for rapidly testing the mechanical property of a twisted steel comprises the following steps:
(1) 10 batches of HRB400 and HRB500 twisted steel bars with the same specification are taken
Naturally cooling hot-rolled twisted steel bars of different batches to room temperature after rolling to be used as a comparison sample;
(2) rapidly cooling the hot-rolled twisted steel to room temperature by adopting an air cooling mode, testing the yield strength Rel, the tensile strength Rm and the elongation A of the corresponding sample batch, and taking the average value of 2 samples;
(3) rapidly cooling the hot-rolled twisted steel to room temperature by adopting a water cooling mode, testing the yield strength Rel, the tensile strength Rm and the elongation A of the corresponding sample batch, and taking the average value of 2 samples;
the mechanical properties were measured according to GB/T1499-2007, and the results are shown in tables 4-6;
TABLE 4 Performance under free cooling conditions
TABLE 5 Performance under air and Water Cooling conditions
TABLE 6 Absolute error of mechanical Properties under air-and water-cooled conditions, compared to Natural Cooling
As can be seen from the table, the natural cooling, the lower cooling bed temperature: cooling to normal temperature at 280 ℃: 145 min; air-cooled cooling lower cooling bed temperature: cooling to normal temperature at 280 ℃: the response of the natural cooling and the air cooling of the mechanical property of the twisted steel is good in 80min, the absolute error of the yield strength Rel is less than or equal to 5MPa, the absolute error of the tensile strength Rm is less than or equal to 5MPa, and the absolute error of the elongation A is less than or equal to 3 percent; cooling by water cooling the lower cooling bed temperature: cooling to normal temperature at 280 ℃: and 7min, the mechanical properties of the twisted steel are well corresponded to natural cooling and water cooling, the absolute error of the yield strength Rel is less than or equal to 5MPa, the absolute error of the tensile strength Rm is less than or equal to 5MPa, and the absolute error of the elongation A is less than or equal to 3%.
Example 3
A method for rapidly testing the mechanical property of a twisted steel comprises the following steps:
(1) 10 batches of HRB400 and HRB500 twisted steel bars with the same specification are taken
Naturally cooling hot-rolled twisted steel bars of different batches to room temperature after rolling to be used as a comparison sample;
(2) rapidly cooling the hot-rolled twisted steel to room temperature by adopting an air cooling mode, testing the yield strength Rel, the tensile strength Rm and the elongation A of the corresponding sample batch, and taking the average value of 2 samples;
(3) rapidly cooling the hot-rolled twisted steel to room temperature by adopting a water cooling mode, testing the yield strength Rel, the tensile strength Rm and the elongation A of the corresponding sample batch, and taking the average value of 2 samples;
the mechanical properties were measured according to GB/T1499-2007, and the results are shown in tables 7-9;
TABLE 7 Performance under Natural Cooling conditions
TABLE 8 Performance under air and Water Cooling conditions
TABLE 9 Absolute error of mechanical Properties under air-and water-cooled conditions, compared to Natural Cooling
As can be seen from the table, the natural cooling, the lower cooling bed temperature: cooling to normal temperature at 300 ℃: 230 min; air-cooled cooling lower cooling bed temperature: cooling to normal temperature at 300 ℃: the mechanical property of the twisted steel is good in correspondence with natural cooling and air cooling for 100min, the absolute error of the yield strength Rel is less than or equal to 5MPa, the absolute error of the tensile strength Rm is less than or equal to 5MPa, and the absolute error of the elongation A is less than or equal to 3%; cooling by water cooling the lower cooling bed temperature: cooling to normal temperature at 300 ℃: the method has the advantages that the natural cooling and water cooling of the mechanical property of the twisted steel are good in corresponding performance within 10min, the absolute error of the yield strength Rel is less than or equal to 5MPa, the absolute error of the tensile strength Rm is less than or equal to 5MPa, and the absolute error of the elongation A is less than or equal to 3%.
Claims (6)
1. A method for rapidly testing the mechanical properties of a twisted steel is characterized in that a hot-rolled twisted steel with the lower cooling bed temperature of less than or equal to 430 ℃ is adopted, the hot-rolled twisted steel is cooled to room temperature by adopting any one of air cooling and normal-temperature water cooling, and then the yield strength, the tensile strength and the elongation percentage of the hot-rolled twisted steel are detected.
2. The method for rapidly inspecting the mechanical property of the deformed steel bar according to claim 1, wherein the deformed steel bar is one of HRB400 and HRB 500.
3. The method for rapidly testing the mechanical properties of the twisted steel according to claim 1, wherein the temperature of the normal temperature water is 15-25 ℃.
4. The method for rapidly inspecting the mechanical property of the deformed steel bar according to claim 1, wherein the yield strength, the tensile strength and the elongation are detected according to the method of GB/T1499-2007.
5. The method for rapidly inspecting the mechanical properties of the twisted steel according to claim 1, wherein the cooling time of the air cooling is 60-100 min.
6. The method for rapidly inspecting the mechanical properties of the twisted steel according to claim 1, wherein the cooling time of the water cooling is 5-10 min.
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| CN202010904844.4A CN112213187A (en) | 2020-09-01 | 2020-09-01 | Method for rapidly testing mechanical property of twisted steel |
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| CN202010904844.4A CN112213187A (en) | 2020-09-01 | 2020-09-01 | Method for rapidly testing mechanical property of twisted steel |
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Citations (5)
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|---|---|---|---|---|
| JP2010101752A (en) * | 2008-10-23 | 2010-05-06 | Jfe Steel Corp | Method for evaluating roll for hot rolling |
| CN102162027A (en) * | 2011-03-30 | 2011-08-24 | 首钢水城钢铁（集团）有限责任公司 | Artificial aging testing method for hot-rolled 82B coil rods |
| CN102841003A (en) * | 2012-08-31 | 2012-12-26 | 江苏永钢集团有限公司 | Quick cooling method for hot-rolled reinforced bar tensile specimen |
| CN104561490A (en) * | 2015-01-23 | 2015-04-29 | 武钢集团昆明钢铁股份有限公司 | Control cooling after rolling method for highline small specification hot rolled ribbed anti-seismic reinforcing steel bar coil |
| CN110579392A (en) * | 2019-08-30 | 2019-12-17 | 陕钢集团汉中钢铁有限责任公司 | Mechanical property detection method for HRB400E steel |
-
2020
- 2020-09-01 CN CN202010904844.4A patent/CN112213187A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010101752A (en) * | 2008-10-23 | 2010-05-06 | Jfe Steel Corp | Method for evaluating roll for hot rolling |
| CN102162027A (en) * | 2011-03-30 | 2011-08-24 | 首钢水城钢铁（集团）有限责任公司 | Artificial aging testing method for hot-rolled 82B coil rods |
| CN102841003A (en) * | 2012-08-31 | 2012-12-26 | 江苏永钢集团有限公司 | Quick cooling method for hot-rolled reinforced bar tensile specimen |
| CN104561490A (en) * | 2015-01-23 | 2015-04-29 | 武钢集团昆明钢铁股份有限公司 | Control cooling after rolling method for highline small specification hot rolled ribbed anti-seismic reinforcing steel bar coil |
| CN110579392A (en) * | 2019-08-30 | 2019-12-17 | 陕钢集团汉中钢铁有限责任公司 | Mechanical property detection method for HRB400E steel |
Non-Patent Citations (6)
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| 张有桔 等: "高温后不同冷却条件下钢材力学性能试验研究", 《结构工程师》, vol. 25, no. 5, pages 104 - 109 * |
| 张有桔 等: "高温后不同冷却条件下钢材力学性能试验研究", 结构工程师, vol. 25, no. 5, pages 104 - 109 * |
| 张茂林 等: "ＨＲＢ４００ 钢筋高温冷却后力学性能试验研究", 《中国科技论文》, vol. 13, no. 1, pages 78 - 82 * |
| 张茂林 等: "HRB400钢筋高温冷却后力学性能试验研究", 中国科技论文, vol. 13, no. 1, pages 78 - 82 * |
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