CN110542622A - Method for testing oxidation burning loss rate of steel billet processed by steel rolling heating furnace - Google Patents
Method for testing oxidation burning loss rate of steel billet processed by steel rolling heating furnace Download PDFInfo
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Abstract
The invention discloses a method for testing the oxidation burning loss rate of a steel billet, which comprises the following steps: 1) weighing the steel sample, and recording the mass of the steel sample; 2) placing a steel sample in a test module, and integrally placing the test module and the steel sample on the upper surface of a billet to be heated in a furnace; 3) the test module and the steel sample enter a furnace along with the steel billet, are gradually heated in a heating furnace, then are discharged out of the furnace along with the steel billet, are put into water for cooling, are cooled to normal temperature and then are taken out, and the iron scale on the surface is cleaned; 4) drying the cleaned steel sample, weighing the dried steel sample, and recording the mass of the steel sample; 5) and calculating the oxidation burning loss rate of the steel sample according to the mass change before and after the steel sample enters the heating furnace. The method for testing the oxidation burning loss rate of the steel billet is simple and easy to implement, can test the oxidation burning loss rates of different steel grades, can repeatedly use the module, and provides a simple and effective method for the actual measurement of the oxidation burning loss data of the steel billet.
Description
Technical Field
the invention relates to the field of metallurgy, in particular to the technical field of steel rolling heating furnaces, and more particularly relates to a method for testing the oxidation burning loss rate of a steel billet processed by a steel rolling heating furnace.
Background
The steel rolling heating furnace is conventional equipment of steel enterprises, and has the function of heating steel billets formed by steel making to the temperature required by rolling, and the temperature of the discharged steel billets is different according to different steel types and is generally about 1200 ℃.
The billet is gradually heated to a target temperature in the heating furnace, and the main element Fe of the billet and the oxidizing components (O2, CO2, H2O, SO2 and the like) in the surrounding gas chemically react to oxidize the surface of the billet, SO that the yield of the billet is reduced, and the production cost is increased. In addition, since the thermal conductivity of the oxide layer coated on the surface of the billet is much smaller than that of iron, the thermal conductivity between the inside and the outside of the billet is affected, the heating efficiency is reduced, the problem that the scale on the surface of the billet cannot be completely removed sometimes occurs, and the defect that the scale is pressed into the surface of the steel plate occurs in the subsequent rolling. In a word, the oxidation burning loss of the billet in the heating furnace brings adverse effects on production, so that the reduction of the oxidation burning loss rate of the billet has important significance for reducing cost and improving efficiency of manufacturers and improving product quality.
The method has the advantages that the oxidation burning loss rate of the steel billet in the heating furnace is reduced, the first problem is to determine the specific numerical value of the current oxidation burning loss, the specific numerical value of the oxidation burning loss rate of the steel billet after relevant measures are taken, and whether the measures are proper or not can be determined after the two are compared, so that the effect is played. Therefore, the method for simply and accurately measuring the oxidation burning loss rate of the steel billet with strong operability provides support for further optimization measures or improvement measures.
However, due to the particularity of continuous production, the test of the oxidation burning loss rate of the billet is difficult to realize. Undoubtedly, theoretically, the steel billets are subjected to mass weighing before entering the furnace, the steel billets are subjected to scale removal after being discharged, then the steel billets are weighed again, the oxidation burning rate of the steel billets after passing through the heating furnace can be calculated through the mass data weighed twice, and the method is most accurate. In actual production, the mass weighing of the steel billet before entering the furnace has no problem, the data is collected in production, the key point is that the steel billet directly enters a roller way after being discharged from the furnace, iron scales on the surface are removed by a high-pressure water dephosphorization device, and then the steel billet enters a rolling mill set for rolling, the rhythm is compact, and online weighing cannot be realized. If a certain steel billet is taken as a research object to be tested independently and is treated independently after being discharged, the steel billet cannot be weighed immediately due to high discharging temperature, and needs to be placed after the steel billet is cooled to be weighed, and the high-temperature steel billet is oxidized inevitably in the placing and cooling process, so that the oxidation burning loss rate value is large, and the test is inaccurate; if the steel billet is subjected to high-pressure water dephosphorization cooling, although the cooling speed is high, the quality of the steel billet is influenced after water spraying, and the measured oxidation burning loss rate is inaccurate. Moreover, the method for separately processing the discharged steel billets has certain influence on the on-site production rhythm, the researched steel billet object cannot be rolled, and the steel billet object is rolled only after being heated again, so that the energy consumption is caused. If an accurate numerical value of the oxidation burning loss of the steel billet is needed, particularly the oxidation comparison condition of the steel billet before and after relevant measures for reducing the oxidation burning loss are known, convincing answers cannot be obviously provided by experience alone, and the effect exertion degree of the relevant measures cannot be clearly judged.
Therefore, there is still a need for a general method for solving the problem of measuring the oxidation burnout rate of different types of steel billets in a heating furnace, which is highly operable and can simply and accurately measure the oxidation burnout rate of the steel billets.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for testing the oxidation burning loss rate of a steel billet processed by a steel rolling heating furnace, aiming at different steel grades, a complete set of testing module and a steel sample corresponding to the steel billet are used, and the quality of the steel sample before entering the heating furnace and after leaving the heating furnace can be quickly obtained by placing the steel sample in the testing module, so that the oxidation burning loss rate of the steel grade can be measured and calculated.
Based on the purpose, the following technical scheme is adopted:
According to the invention, the method for testing the oxidation burning loss rate of the steel billet is provided, the test module carrying the steel sample and the steel billet are fed into a furnace and discharged from the furnace under the same condition, and the oxidation burning loss rate of the steel billet is calculated by testing the quality of the steel sample before feeding into the furnace and the net quality of the steel sample after discharging from the furnace.
further, the net mass of the steel sample after discharging is the mass of the steel sample after cleaning iron scale on the surface of the steel sample.
Further, the method for testing the oxidation burning loss rate of the steel billet comprises the following steps:
1) The steel specimen was weighed and the mass of the specimen was recorded as m 1.
2) placing a steel sample in a test module, and integrally placing the test module and the steel sample on the upper surface of a billet to be heated in a furnace;
3) the test module and the steel sample enter a furnace along with the steel billet, are gradually heated in a heating furnace, then are discharged out of the furnace along with the steel billet, are put into water for cooling, are cooled to normal temperature and then are taken out, and the iron scale on the surface is cleaned;
4) Drying the cleaned steel sample, weighing the dried steel sample, and recording the mass of the steel sample as m 2;
5) calculating the oxidation burning loss rate (eta i) of the steel sample according to the mass change before and after the steel sample enters the heating furnace:
The testing module comprises a base, a pull ring for moving the testing module and a supporting piece for supporting a steel sample; the pull ring and the supporting piece are respectively arranged on the same surface of the base; the pull rings are of hollow structures, and at least two pull rings are arranged at the positions, close to the edges, of the base; the support is arranged inside the pull ring.
The invention adopts the test module to prevent the direct contact of the steel sample and the steel billet, and if the steel sample is directly prevented on the steel billet, the oxidation burning loss rate of the contact surface of the steel sample and the steel billet is inevitably inconsistent with the oxidation burning loss rate of other surfaces of the steel sample, thereby causing the deviation of the oxidation burning loss rate of the steel sample.
Further, the test module and the steel sample are integrally placed on the longitudinal center line of the upper surface of the steel slab to be furnace-heated.
further, the steel sample is a small sample billet of a steel billet, wherein the size of the steel sample is made in proportion to the size of the steel billet when the steel sample is made, i.e., the steel sample is made in such a way that the steel sample is a small sample billet of the steel billet
Wherein b is the length of the steel sample, d is the width of the steel sample, and h is the height of the steel sample; b is the length of the billet, D is the width of the billet, and H is the height of the billet.
The size of the steel sample is made in proportion to the size of the steel billet, the burning loss rate of the steel sample can be directly regarded as the burning loss rate of the steel billet and the burning loss rate of the steel grade, conversion of specific surface area is not needed, and the testing steps are simplified.
further, the steel sample and the steel slab belong to the same steel grade.
Further, after the at least three test modules are respectively placed in the at least three test modules, placing the at least three test modules with the steel samples on different positions of the longitudinal center line of the upper surface of the billet to be heated in the furnace; the test method simultaneously tests the oxidation burning loss rate of the at least three steel samples.
The method comprises the steps of integrally placing a plurality of test modules and a steel sample at different positions of the longitudinal center line of the upper surface of a billet to be heated in a furnace, and firstly, obtaining the oxidation burning loss rate of the billet at a plurality of positions, so that the obtained average value is closer to the average oxidation burning loss rate of the billet. Secondly, the setting can also find the abnormity of the heating furnace, specifically, for example, if the oxidation burning loss rate of the steel sample at a certain position is greatly different from the oxidation burning loss rates of the steel samples at other positions, the atmosphere or the temperature of the oxidation furnace at the position is indicated to be in problem, the heating furnace can be stopped and repaired, and thus, unnecessary loss can not be caused to the subsequent production.
Furthermore, the testing method further comprises the steps of: calculating the average value of the oxidation burning loss rates of at least three steel samples as the oxidation burning loss rate of the steel billet
Wherein n is a natural number and is the number of the oxidation burning loss rate values of the steel sample.
further, the steel sample is placed on at least two supports arranged spaced apart when the steel sample is placed in the test module. Firstly, the support is only contacted with two positions on the bottom surface of the steel sample, and other positions are still contacted with air, so that the inconsistency of the oxidation burning loss rate of the steel sample and the contact surface of the support and other surfaces of the steel sample is minimized, and the more accurate oxidation burning loss rate of the steel sample is obtained. Secondly, because the support piece only contacts with two positions of the bottom surface of the steel sample, make the steel sample take off from the support piece fast easily, carry out the oxidation and burn out the rate test. The steel sample is difficult to take down after being taken out of the furnace, so that the high-temperature steel sample is difficult to avoid oxidizing in the long-time taking-down process, and further the oxidation burning loss rate value is larger. Therefore, the test method of the invention enables the measurement to be more accurate.
Further, the extension length of the pull ring at the base edge is less than the length and width of the steel sample so as to be retained by the pull ring when the steel sample moves relative to the support.
Further, the height of the pull ring is greater than the total height of the steel sample after being placed on the support, so that the steel sample is retained by the pull ring when moving relative to the support.
Furthermore, the step 3) also comprises a test module and a steel sample which is discharged out of the furnace along with the steel billet, the steel sample is directly taken down from the support piece and is put into water for cooling, and the test module is separated from the steel billet by applying force to the pull ring.
Further, the steel sample is dried in a drying oven under the drying condition of 110 ℃ for 2-4 h.
The invention has the beneficial effects that:
The method for testing the oxidation burning loss rate of the steel billet is simple and easy to implement, can test the oxidation burning loss rates of different steel grades, has simple operation, does not influence the production rhythm or the rolling of the steel billet, and provides a simple and effective method for the actual measurement of the oxidation burning loss data of the steel billet.
The invention aims to provide a method for testing the oxidation burning loss rate of a steel billet of a heating furnace, namely, a complete set of testing modules are processed and manufactured, the modules are placed on the steel billet and enter the heating furnace along with the steel billet to be heated, the oxidation burning loss rate of the steel sample is obtained by weighing the quality parameters of the steel sample before and after the steel sample in the modules is heated, and the variety, the heating time and the like of the steel sample are kept consistent with the steel billet, so that the oxidation burning loss rate of the steel sample is basically consistent with the steel billet, and the test method can be used as a reference for the oxidation burning loss rate of the.
according to the invention, the form and the material of the base can be relatively fixed, and the shape and the material of the steel sample can be manufactured according to actual requirements, so that the oxidation burning loss rate of different steel types under different heating working conditions can be tested by the method.
Drawings
in order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some implementation examples of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic elevation view of a steel specimen placed in a test module according to an embodiment of the present invention;
FIG. 2 is a schematic top view of a steel specimen according to an embodiment of the present invention placed in a test module;
FIG. 3 is a schematic side view of a steel specimen according to an embodiment of the present invention placed in a test module;
FIG. 4 is a schematic side view of a test module according to an embodiment of the present invention;
Fig. 5 is a schematic top view illustrating the placement of the test module on the steel billet according to the embodiment of the present invention.
List of reference numerals
101 base, 102 pull ring, 103 support, 2 steel sample, 3 test module, 4 steel billet.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention are described in further detail with reference to the accompanying drawings.
The invention provides a method for testing the oxidation burning loss rate of a steel billet, which comprises the following steps:
1) The sample is produced as a billet of the same type, wherein the size of the sample is produced in proportion to the size of the billet, i.e. the sample is produced as a billet of the same type
Wherein b is the length of the steel sample, d is the width of the steel sample, and h is the height of the steel sample; b is the length of the billet, D is the width of the billet, and H is the height of the billet.
2) The steel specimen was weighed and the mass of the specimen was recorded as m 1.
2) placing a steel sample in a test module, and integrally placing the test module and the steel sample on a longitudinal central line of the upper surface of a billet to be heated in a furnace;
3) The test module and the steel sample enter a furnace along with the steel billet, the test module and the steel sample are discharged from the furnace along with the steel billet after being gradually heated in the heating furnace, the steel sample is directly taken down from the support piece and is put into water for cooling, the steel sample is taken out after being cooled to normal temperature, and iron scale on the surface is cleaned; separating the test module from the steel billet by applying a force to the pull ring;
4) drying the cleaned steel sample in a drying oven at 110 ℃ for 2-4h, weighing the dried steel sample, and recording the mass of the steel sample as m 2;
5) calculating the oxidation burning loss rate (eta i) of the steel sample according to the mass change before and after the steel sample enters the heating furnace:
Preferably, after the at least three test modules are respectively placed in the at least three test modules, the at least three test modules with the steel samples placed therein are placed at different positions of the longitudinal center line of the upper surface of the billet to be heated in the furnace; the test method simultaneously tests the oxidation burning loss rate of the at least three steel samples.
preferably, the test method further comprises the steps of: calculating the average value of the oxidation burning loss rates of at least three steel samples as the oxidation burning loss rate of the steel billet
Wherein n is a natural number and is the number of the oxidation burning loss rate values of the steel sample.
As shown in fig. 1-3, the test module comprises a base 101, a pull ring 102 for moving the test module, and a support 103 for supporting a steel sample 2; the pull ring 102 and the support member 103 are respectively arranged on the same surface of the base 101; the pull ring 102 is a hollow structure and at least two pull rings 102 are arranged at the position close to the edge of the base 101; the supports 103 are arranged inside the pull ring 102, and when a steel sample 2 is placed in the test module, the steel sample 2 is placed on at least two supports 103 arranged at a distance. The extension length of the pull ring 102 at the edge of the base 101 is smaller than the length and width of the steel sample 2 so that the steel sample 2 is restrained by the pull ring 102 when moving relative to the support 103. The height of the pull ring 102 is greater than the total height of the steel sample 2 after it is placed on the support so that the steel sample 2 is restrained by the pull ring 102 when it moves relative to the support 103.
The longitudinal centerline of the billet according to the present invention is the centerline of the upper surface of the billet in the longitudinal direction thereof, as shown in fig. 5.
Examples
(1) Overview of the production
A U75V steel slab having dimensions (length (B) × width (D) × height (H)) -7680 mm × 380mm × 280mm and a mass of about 6.4 t. The charging temperature of the steel billet is 80 ℃, the discharging temperature is 1201 ℃, and the steel billet stays in the heating furnace for 4.0 hours.
(2) Manufacturing of a Steel sample
Steel samples having a certain size (length (b) × width (d) × height (h)) were prepared by sampling from the site, and for more accurate testing, the steel samples were prepared while keeping the size of the steel samples in proportion to the actual billet size, that is, 3 steel samples having b × d × h of 100mm × 5mm × 3.6mm were prepared in total according to the convenience of actual operation.
(3) Manufacturing test module
The base 101 is manufactured, the size requirement of the base is not strict, and the steel sample 2 can be stably placed. Therefore, a base with a length × width × thickness of 250mm × 150mm × 10-15 mm is manufactured, and the base is made of a steel plate and is made of stainless steel. 4 pull rings 102 shown in figures 1, 2 and 3 are welded on a base 101, and the pull rings 102 are made of phi (8-10 mm) steel bars. The support 103 serves to carry the steel pattern 2, as shown in fig. 1 and 3. Fig. 1 shows that two supporting pieces 103 are welded on a base 101, the supporting pieces are made of 10mm thick steel plates, the length and the width of the supporting pieces do not have special requirements, and the supporting pieces can stably bear steel samples 2 at two ends of the steel samples 2. Therefore, two supports 103 having a length × height × thickness of 60mm × 80mm × 10mm are manufactured, in which the long sides of the supports 103 are welded to the base 101, and the thickness surface of the supports 103 is in contact with the steel sample 2.
And 3 test modules are manufactured by matching the number of the steel samples.
The mass of each of 3 steel samples was measured, and m1-1 was 14.0kg, m1-2 was 13.96kg, and m1-3 was 14.2 kg.
(4) Feeding steel sample into furnace
and placing the manufactured 3 steel samples on the supporting pieces of the 3 test modules respectively, and placing stably. Then, 3 test modules 3 are placed on the steel slab 4 to be charged into the furnace, one on each of both ends and the middle (see fig. 4), and the test modules 3 are placed on the longitudinal center line of the upper surface of the steel slab 4 (see fig. 5).
The test module enters a heating furnace along with the steel billet, the temperature in the furnace is gradually raised, the steel sample is simultaneously heated, and the steel sample stays in the furnace for 4.0h and then is discharged along with the steel billet.
(5) Calculation of Oxidation burn-out Rate
and after the test module is taken out of the furnace along with the steel billet, putting the whole test module into water for cooling, taking out the steel sample after cooling to normal temperature, and cleaning iron scale on the surface. The pull ring 102 is hooked or clamped by a hook or a long handled clamp and the test module is released from the top surface of the billet.
And (3) putting the cleaned steel sample into an oven for drying, and drying for 4h at the temperature of 110 ℃ to ensure thorough drying.
The dried steel samples were weighed and the mass recorded for the steel samples was 13.88kg m2-1, 13.85kg m2-2 and 14.09kg m 2-3.
Calculating the oxidation burning loss rate (eta i) of the steel sample according to the mass change of the steel sample before and after the heating furnace:
calculating the average value of the oxidation burning loss rate of a plurality of steel samples
Thus, the oxidation burnout rate of the obtained U75V steel billet in the furnace was 0.81%, and similarly, the oxidation burnout rate of the U75V steel grade in the furnace was 0.81%.
The foregoing is an exemplary embodiment of the present disclosure, but it should be noted that various changes and modifications could be made herein without departing from the scope of the present disclosure as defined by the appended claims. Furthermore, although elements of the disclosed embodiments of the invention may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.
It should be understood that, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly supports the exception. It should also be understood that "and/or" as used herein is meant to include any and all possible combinations of one or more of the associated listed items.
The numbers of the embodiments disclosed in the embodiments of the present invention are merely for description, and do not represent the merits of the embodiments.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, of embodiments of the invention is limited to these examples; within the idea of an embodiment of the invention, also technical features in the above embodiment or in different embodiments may be combined and there are many other variations of the different aspects of an embodiment of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of the embodiments of the present invention are intended to be included within the scope of the embodiments of the present invention.
Claims (10)
1. The method for testing the oxidation burning loss rate of the steel billet is characterized in that a test module carrying a steel sample and the steel billet are fed into a furnace and discharged from the furnace under the same condition, and the oxidation burning loss rate of the steel billet is calculated by testing the quality of the steel sample before feeding into the furnace and the net quality of the steel sample after discharging from the furnace.
2. The method of claim 1, wherein the net mass of the tapped steel sample is a mass obtained by cleaning iron scale on the surface of the steel sample.
3. The method of claim 1, comprising the steps of:
1) Weighing the steel sample, and recording the mass of the steel sample;
2) placing a steel sample in a test module, and placing the test module with the steel sample on the upper surface of a billet to be heated in a furnace;
3) The test module and the steel sample enter a furnace along with the steel billet, are gradually heated in a heating furnace, then are discharged out of the furnace along with the steel billet, are put into water for cooling, are cooled to normal temperature and then are taken out, and the iron scale on the surface is cleaned;
4) Drying the cleaned steel sample, weighing the dried steel sample, and recording the mass of the steel sample;
5) Calculating the oxidation burning loss rate of the steel sample according to the mass change of the steel sample before and after entering the heating furnace;
Wherein the test module comprises a base, a pull ring for moving the test module and a support for supporting a steel sample; the pull ring and the supporting piece are respectively arranged on the same surface of the base; the pull rings are of hollow structures, and at least two pull rings are arranged at the position, close to the edge, of the base; the support is disposed inside the tab.
4. The method of claim 3, wherein the test block having the steel sample placed thereon is placed on a longitudinal center line of an upper surface of the steel slab to be heated in the furnace.
5. The method of claim 3, wherein the sample is a billet of the same type as the slab, and wherein the size of the sample is made in proportion to the size of the slab when the sample is made, that is, the sample is made in such a manner that the sample is made in the same size as the slab
wherein b is the length of the steel sample, d is the width of the steel sample, and h is the height of the steel sample; b is the length of the billet, D is the width of the billet, and H is the height of the billet.
6. The method of claim 4, wherein after the at least three test modules are placed in the at least three test modules, the at least three test modules with the steel samples placed therein are placed at different positions on a longitudinal centerline of the upper surface of the steel slab to be heated in the furnace; the test method simultaneously tests the oxidation burning loss rate of the at least three steel samples.
7. The method of testing the oxidation burn-out rate of a steel slab as set forth in claim 6, further comprising the steps of: and calculating the average value of the oxidation burning loss rates of the at least three steel samples as the oxidation burning loss rate of the steel billet.
8. The method of testing the oxidation burn-out rate of a steel slab of claim 3, wherein the steel sample is placed on at least two of said supports spaced apart when the steel sample is placed in the test module.
9. the method of claim 3 wherein the pull ring has an extension length at the base edge that is less than the length and width of the steel pattern and a height that is greater than the total height of the steel pattern after it is placed on the support such that the steel pattern is retained by the pull ring when it is moved relative to the support.
10. The method of claim 3, wherein the step 3) further comprises discharging the test block and the sample from the furnace with the steel slab, directly removing the sample from the support, cooling the sample in water, and separating the test block from the steel slab by applying a force to the pull ring.
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| CN112285268A (en) * | 2020-10-29 | 2021-01-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Simulation test device and method for oxidation burning loss of steel billet |
| CN112444464A (en) * | 2020-10-14 | 2021-03-05 | 首钢京唐钢铁联合有限责任公司 | Method and device for determining oxidation burning loss rate of plate blank |
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| CN206583669U (en) * | 2017-03-28 | 2017-10-24 | 山东泰山钢铁集团有限公司 | High-temperature oxidation test steel billet sample mount |
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| CN110057712A (en) * | 2019-04-24 | 2019-07-26 | 首钢集团有限公司 | A kind of oxidization burning loss rate measurement system and method |
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| CN112444464A (en) * | 2020-10-14 | 2021-03-05 | 首钢京唐钢铁联合有限责任公司 | Method and device for determining oxidation burning loss rate of plate blank |
| CN112285268A (en) * | 2020-10-29 | 2021-01-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Simulation test device and method for oxidation burning loss of steel billet |
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Application publication date: 20191206 |