CN109827861B - Method for detecting peeling performance of hot-rolled wire rod oxide skin - Google Patents
Method for detecting peeling performance of hot-rolled wire rod oxide skin Download PDFInfo
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Abstract
The invention provides a method for detecting the peeling performance of a hot-rolled wire rod oxide skin, which comprises the steps of clamping a straightened hot-rolled wire rod sample on a wire rod torsion testing machine, and then performing unilateral torsion on the sample by 90-180 degrees by using the wire rod torsion testing machine; in the torsion process of the sample, the sample falls off due to poor deformation capability of the oxide skin, and the fallen oxide skin is collected, weighed and recorded as m; screening the scale falling off by using a 6-8-mesh screen, weighing the screened large-size scale, and recording as m 1; the hot rolled wire rod scale peeling performance was evaluated by calculating a peeling performance index (D), which is m 1/m. The invention effectively simulates the continuous bending of the wire rod in different directions in the mechanical peeling, considers the influence factor of the evaluation of the peeling performance of the wire rod oxide skin, and can accurately evaluate the peeling performance of the wire rod oxide skin by introducing the peeling performance index (D) and considering both the peeling amount and the size of the oxide skin, thereby having simple operation and accurate result.
Description
Technical Field
The invention belongs to the field of analysis of metal materials, and relates to a method for detecting the peeling performance of a hot-rolled wire rod oxide skin.
Background
In the subsequent deep processing process of the hot-rolled wire rod, the metal product enterprises generally remove oxide skins by acid washing or mechanical shelling. The pickling is to remove oxide skin on the surface of steel by using an acid solution, and the method can generate a large amount of waste acid, acid-containing wastewater, acid residue residues and the like, and once the acid is not properly treated, the soil, water, air and the like can be polluted. Mechanical peeling is to bend the wire rod in different directions continuously, and oxide skin falls off from the surface of the wire rod due to poor deformation capability, so that the environmental protection problem is basically eliminated in the whole process. Therefore, with the increasing of the environmental protection requirement, the metal product enterprises gradually increase the specific gravity of mechanical husking or adopt mechanical husking to replace acid washing. However, quality dissimilarities between steel mills and metal product enterprises due to poor peeling performance of the hot rolled wire rod scale are increasing, and it is urgent for steel mills to find a method which is simple to operate and can accurately detect the peeling performance of the hot rolled wire rod scale.
At present, in the related art disclosed in the literature, the method for detecting the scale peeling performance of the wire rod is mainly measured by a stretching method. Patent CN108489850A discloses a method for measuring the peeling rate of the scale on the surface of the wire rod, which is obtained by measuring the weight of the wire rod before and after uniform deformation during the drawing process, and the weight of the wire rod after the scale is completely removed from the surface. The method has the following defects: 1. the method has complicated detection steps, and has the steps of cleaning, drying and the like, and the steps have higher risk of human errors, thus seriously influencing the accuracy of the detection result. 2. The method has the limitation in evaluating the stripping rate of the oxide skin of the wire rod; the stripping performance of the wire rod scale is not only related to the stripping amount of the scale, but also closely related to the size of the scale to be stripped. When the method is used for testing the stripping performance of the oxide scale of the wire rod, the stripping amount of the oxide scale is large, but the oxide scale is mainly powdery or is completely powdery, the stripping effect of the oxide scale is good according to the test result of the wire rod, and the actual mechanical stripping effect is very poor. 3. The method detects scale skin peeled off at the axial uniform deformation stage in the stretching process, but the wire rod is not deformed but continuously bent in different directions in the actual mechanical peeling process, and the method has a large difference with the mechanical peeling principle, so that the mechanical peeling and scale skin peeling performances of the wire rod cannot be accurately represented.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for detecting the peeling performance of a hot-rolled wire rod oxide skin, which adopts a wire rod torsion testing machine to perform single-side torsion on a sample to be detected, effectively simulates continuous bending of the wire rod in different directions in mechanical peeling, considers the influence factors of the peeling performance evaluation of the wire rod oxide skin, and accurately evaluates the peeling performance of the wire rod oxide skin by introducing a peeling performance index (D) and considering both the peeling amount and the size of the oxide skin.
In order to achieve the aim of the invention, the invention provides a method for detecting the peeling performance of a hot-rolled wire rod oxide skin, which comprises the following steps:
a method for detecting the peeling performance of a hot-rolled wire rod oxide skin comprises the following steps:
a) straightening a sample: taking a section of hot-rolled wire rod sample, recording the length as L, and straightening the sample;
b) sample clamping: after aligning the clamp of the wire torsion testing machine, clamping the two ends of the sample, wherein the length of the sample clamped by the clamp is marked as L1;
c) twisting: performing unilateral torsion on the sample by using a wire torsion testing machine to ensure that an oxide skin falls off in the sample torsion process;
d) weighing and screening: collecting the scale skin which falls off, weighing the scale skin and recording as m; screening the scale cinder by using a sieve, weighing the screened large-size scale cinder, and recording the scale cinder as m 1;
e) and (3) calculating: and calculating the stripping performance index D, wherein the D is m1/m, and the larger the D is, the better the stripping performance of the hot-rolled wire rod oxide skin is.
Further, in the method for detecting the peeling performance of the hot-rolled wire rod oxide skin, the length L of the sample is (300 ± 50) +2L 1; l1 is 15. + -. 5 mm.
Further, the sample torsion angle of the method for detecting the hot-rolled wire rod oxide skin stripping performance is 90-180 degrees, and the torsion speed is 360-720 degrees/min;
further, the aperture of the sieve of the method for detecting the peeling performance of the hot-rolled wire rod oxide skin is 6-8 meshes.
Compared with the prior art, the invention has at least the following beneficial effects:
the wire rod torsion testing machine is adopted to carry out single-side torsion on a sample to be tested, the continuous bending of the wire rod in different directions in the mechanical peeling process is effectively simulated, the influence factors of the peeling performance evaluation of the wire rod oxide skin are considered, the peeling performance of the wire rod oxide skin can be accurately evaluated by introducing the peeling performance index (D) and considering the peeling amount and the size of the oxide skin, and the wire rod torsion testing machine is simple in testing step, easy to operate and accurate in result.
Detailed Description
The invention discloses a method for detecting the peeling performance of a hot-rolled wire rod oxide skin, which comprises the following steps:
a) straightening a sample: taking a section of hot-rolled wire rod sample, recording the length as L, and straightening the sample;
b) sample clamping: after the grips of the wire torsion tester were aligned, the sample was gripped at both ends, and the grips gripped the sample length, designated as L1, where the sample length L is (300 ± 50) +2L1, and L1 is 15 ± 5 mm.
c) Twisting: and (3) performing unilateral torsion on the sample by using a wire torsion testing machine, so that the oxide skin falls off in the sample torsion process. The single-side torsion can effectively simulate the continuous bending of the wire rod in different directions in the mechanical husking, and the oxide skin falls off from the surface of the wire rod due to poor deformability. The torsion angle is 90-180 degrees, and the torsion speed is 360-720 degrees/min; the torsion angle mainly influences the scale stripping amount, the setting of a reasonable torsion angle is the key for accurately evaluating the scale stripping performance, and the torsion speed also influences the scale stripping amount, the scale size and the inspection efficiency.
d) Weighing and screening: collecting the scale skin which falls off, weighing the scale skin and recording as m; the scale removed was screened through a 6-8 mesh screen and the large scale screened was weighed and reported as m 1. The setting of the aperture of the sieve is the key of the screening process, the deviation between the result of the method and the actual scale stripping performance of the wire rod is large due to the fact that the aperture of the sieve is too large or too small, the screening is carried out by adopting a sieve with 6-8 meshes, and the result of the method can accurately evaluate the actual scale stripping performance of the wire rod.
e) And (3) calculating: calculating the stripping performance index D, wherein D is m 1/m; when D is larger, the hot rolled wire rod scale peeling property is better. Considering that the evaluation results of the scale release properties of the wire rod are related not only to the scale release amount but also to the scale size during the test, the introduction of the release property index (D) allows both the scale release amount and the scale size to be considered, and the scale release properties of the wire rod can be accurately evaluated.
The present invention is further described with reference to the following examples, which should not be construed as limiting the invention thereto.
Example 1
The method comprises the steps of taking a phi 5.5mm SWRH72A hot-rolled wire rod with the length of 290mm, straightening the wire rod by using a wooden hammer or a straightening machine, aligning a clamp of a wire rod torsion testing machine, clamping two ends of a sample on the wire rod torsion testing machine, twisting the sample at one side for 90 degrees at the twisting speed of 360 degrees/min to enable an oxide skin to fall off in the sample twisting process, collecting and weighing the fallen oxide skin, wherein m is 0.1047g, screening the oxide skin by using a 6-mesh screen, weighing the screened large-size oxide skin, wherein m1 is 0.0534g, and calculating the stripping performance index D to be 0.51.
Example 2
Taking a phi 5.5mm LX72A hot-rolled wire rod with the length of 290mm, straightening the wire rod by using a wooden hammer or a straightening machine, aligning a clamp of a wire rod torsion testing machine, clamping two ends of a sample on the wire rod torsion testing machine, respectively clamping two ends of the sample on the wire rod torsion testing machine, twisting the sample at one side by 90 degrees to ensure that an oxide skin falls off in the sample torsion process, collecting and weighing the fallen oxide skin, wherein m is 0.1307g, screening the oxide skin by using a 6-mesh screen, weighing the screened large-size oxide skin, wherein m1 is 0.0784g, and calculating the stripping performance index D to be 0.60.
Example 3
Taking a phi 5.5mm LX72A hot-rolled wire rod with the length of 290mm, straightening the wire rod by using a wooden hammer or a straightening machine, aligning a clamp of a wire rod torsion testing machine, clamping two ends of a sample on the wire rod torsion testing machine, twisting at 360 DEG/min at one side for 120 DEG to enable an oxide skin to fall off in the sample torsion process, collecting and weighing the fallen oxide skin, wherein m is 0.1539g, screening the oxide skin by using a 6-mesh screen, weighing the screened large-size oxide skin, wherein m1 is 0.0939g, and calculating the stripping performance index D to be 0.61.
Example 4
The method comprises the steps of taking a phi 5.5mm C82DA hot-rolled wire rod with the length of 310mm, straightening the wire rod by using a wooden hammer or a straightening machine, aligning a clamp of a wire rod torsion testing machine, clamping two ends of a sample on the wire rod torsion testing machine, twisting at 360 degrees/min on one side for 120 degrees to enable an oxide skin to fall off in the sample torsion process, collecting and weighing the fallen oxide skin, wherein m is 0.1902g, screening the oxide skin by using an 8-mesh screen, weighing the screened large-size oxide skin, wherein m1 is 0.1541g, and calculating the stripping performance index D to be 0.81.
Example 5
The method comprises the steps of taking a phi 5.5mm C82DA hot-rolled wire rod with the length of 310mm, straightening the wire rod by using a wooden hammer or a straightening machine, aligning a clamp of a wire rod torsion testing machine, clamping two ends of a sample on the wire rod torsion testing machine, twisting at one side for 120 degrees at the torsion speed of 720 degrees/min to enable an oxide skin to fall off in the torsion process of the sample, collecting and weighing the fallen oxide skin, wherein m is 0.2304g, screening the oxide skin by using an 8-mesh screen, weighing the screened large-size oxide skin, wherein m1 is 0.1820g, and calculating the stripping performance index D to be 0.79.
Example 6
Taking a phi 5.5mm ER70S-6 hot rolled wire rod with the length of 330mm, straightening the wire rod by using a wooden hammer or a straightening machine, aligning a clamp of a wire rod torsion testing machine, clamping two ends of a sample on the wire rod torsion testing machine, twisting at the single side of the sample by 180 degrees at the twisting speed of 720 degrees/min to ensure that an oxide skin falls off in the sample twisting process, collecting and weighing the fallen oxide skin, wherein m is 0.1021g, screening the oxide skin by using a 6-mesh screen, weighing the screened large-size oxide skin, wherein m1 is 0.0214g, and calculating the stripping performance index D to be 0.21.
Example 7
Taking a phi 5.5mm SWRH72A hot rolled wire rod with the length of 330mm, straightening the wire rod by using a wooden hammer or a straightening machine, aligning a clamp of a wire rod torsion testing machine, clamping two ends of a sample on the wire rod torsion testing machine, twisting at the speed of 720 DEG/min and at one side of 180 DEG to ensure that an oxide skin falls off in the sample torsion process, collecting and weighing the fallen oxide skin, wherein m is 0.1904g, screening the oxide skin by using a 6-mesh screen, weighing the screened large-size oxide skin, wherein m1 is 0.1009g, and calculating the stripping performance index D to be 0.53.
Example 8
Taking a phi 5.5mm LX72A hot-rolled wire rod with the length of 330mm, straightening the wire rod by using a wooden hammer or a straightening machine, aligning a clamp of a wire rod torsion testing machine, clamping two ends of a sample on the wire rod torsion testing machine, twisting at the speed of 720 DEG/min and at one side of 180 DEG to ensure that an oxide skin falls off in the sample torsion process, collecting and weighing the fallen oxide skin, wherein m is 0.2113g, screening the oxide skin by using a 6-mesh screen, weighing the screened large-size oxide skin, wherein m1 is 0.1268g, and calculating the stripping performance index D to be 0.60.
Example 9
Taking a phi 5.5mm LX82A hot-rolled wire rod with the length of 350mm, straightening the wire rod by using a wooden hammer or a straightening machine, aligning a clamp of a wire rod torsion testing machine, clamping two ends of a sample on the wire rod torsion testing machine, twisting at the speed of 720 DEG/min and at one side of 180 DEG to ensure that an oxide skin falls off in the sample torsion process, collecting and weighing the fallen oxide skin, wherein m is 0.2518g, screening the oxide skin by using an 8-mesh screen, weighing the screened large-size oxide skin, wherein m1 is 0.2115g, and calculating the stripping performance index D to be 0.84.
Example 10
Taking a phi 5.5mm LX82A hot-rolled wire rod with the length of 350mm, straightening the wire rod by using a wooden hammer or a straightening machine, aligning a clamp of a wire rod torsion testing machine, clamping two ends of a sample on the wire rod torsion testing machine, twisting at 540 DEG/min at one side for 180 DEG to enable an oxide skin to fall off in the sample torsion process, collecting and weighing the fallen oxide skin, wherein m is 0.2493g, screening the oxide skin by using an 8-mesh screen, weighing the screened large-size oxide skin, wherein m1 is 0.2119g, and calculating the stripping performance index D to be 0.85.
Table 1 shows the index D of the peeling property of the wire rod and the peeling property in actual production in examples 1 to 10. The stripping performance index D is consistent with the stripping performance of actual production, and when the D is larger, the stripping performance of the hot-rolled wire rod oxide skin is better; when the 6-mesh sieve is used for screening, and D is more than or equal to 0.60, the hot-rolled wire rod oxide skin stripping performance is good, and the use requirement is met.
TABLE 1 index D of strip peeling performance and actual production peeling performance for wire rods in examples 1-10
Claims (3)
1. The method for detecting the peeling performance of the hot-rolled wire rod oxide skin is characterized by comprising the following steps of:
a) straightening a sample: taking a section of hot-rolled wire rod sample, recording the length as L, and straightening the sample;
b) sample clamping: after aligning the clamp of the wire torsion testing machine, clamping the two ends of the sample, wherein the length of the sample clamped by the clamp is marked as L1, and L1 is 15 +/-5 mm;
c) twisting: performing unilateral torsion on the sample by using a wire torsion testing machine to ensure that an oxide skin falls off in the sample torsion process;
d) weighing and screening: collecting the scale skin which falls off, weighing the scale skin and recording as m; screening the scale cinder by using a sieve with the aperture of 6-8 meshes, and weighing the screened large-size scale cinder, wherein the large-size scale cinder is marked as m 1;
e) and (3) calculating: and calculating the stripping performance index D, wherein the D is m1/m, and the larger the D is, the better the stripping performance of the hot-rolled wire rod oxide skin is.
2. The method for detecting the peeling property of the hot rolled wire rod as claimed in claim 1, wherein the sample length L is (300 ± 50) +2L 1.
3. The method for detecting the peeling performance of the hot rolled wire rod oxide skin as claimed in claim 1, wherein the sample torsion angle is 90-180 °, and the torsion speed is 360-720 °/min.
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| CN203216830U (en) * | 2013-02-28 | 2013-09-25 | 首钢总公司 | Measuring device for adhesion force of oxide scale |
| CN103674834A (en) * | 2013-12-04 | 2014-03-26 | 武汉钢铁(集团)公司 | Rapid detection method for surface oxide scale adhesion of hot rolling strip steel |
| CN105628607A (en) * | 2015-12-29 | 2016-06-01 | 首钢总公司 | Oxide scale binding force representation method |
| CN207457011U (en) * | 2017-07-14 | 2018-06-05 | 西安热工研究院有限公司 | A kind of oxide skin on-line measuring device |
| CN207336396U (en) * | 2017-09-06 | 2018-05-08 | 河钢股份有限公司邯郸分公司 | A kind of device of quick detection metal wire material surface defect |
| CN108489850B (en) * | 2018-02-28 | 2021-04-13 | 江苏省沙钢钢铁研究院有限公司 | Method for measuring stripping rate of oxide skin of wire rod |
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