CN112784367A - Method for calculating thickness of blank shell at position of continuous casting roller row and solidification tail end of casting machine - Google Patents
Method for calculating thickness of blank shell at position of continuous casting roller row and solidification tail end of casting machine Download PDFInfo
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- 238000007711 solidification Methods 0.000 title claims abstract description 36
- 230000008023 solidification Effects 0.000 title claims abstract description 36
- 238000005266 casting Methods 0.000 title claims abstract description 32
- 238000009749 continuous casting Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 230000000694 effects Effects 0.000 claims abstract description 4
- 238000012821 model calculation Methods 0.000 claims abstract description 4
- 239000007791 liquid phase Substances 0.000 claims abstract 2
- 238000012937 correction Methods 0.000 claims description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 2
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 238000003801 milling Methods 0.000 claims description 2
- 229910017604 nitric acid Inorganic materials 0.000 claims description 2
- 230000005499 meniscus Effects 0.000 claims 3
- 230000008602 contraction Effects 0.000 claims 1
- 238000005204 segregation Methods 0.000 abstract description 7
- 238000003825 pressing Methods 0.000 abstract description 3
- 238000003756 stirring Methods 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- 238000004364 calculation method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 238000002360 preparation method Methods 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 238000013178 mathematical model Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000010310 metallurgical process Methods 0.000 description 1
- 239000000700 radioactive tracer Substances 0.000 description 1
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- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
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Abstract
本发明涉及一种连铸辊列位置坯壳厚度和铸机凝固末端推算方法，其特征在于：利用零塑性温度与固相线温度近似相等的规律，通过寻找连铸坯低倍上的点状裂纹，测量裂纹距铸坯边部的距离，求得拉矫辊处的坯壳厚度，根据测得的距弯月面最远辊子处的坯壳厚度和相应辊列位置和拉速，通过二次运用凝固定律平方根公式，进一步推算铸机综合凝固系数和液相穴长度，从而实现射钉或者凝固模型计算的效果。本发明公布一种不需模型、无须射钉，通过研究连铸坯低倍，推断坯壳厚度和凝固末端的方法，进而可以优化末端电磁搅拌、轻压下工装布置和生产工艺，从而改善连铸坯、轧材的偏析问题。The invention relates to a method for estimating the thickness of the shell at the row position of the continuous casting roll and the solidification end of the casting machine. Crack, measure the distance between the crack and the edge of the billet, and obtain the thickness of the billet at the pull-leveling roll. Next, the square root formula of the solidification law is used to further calculate the comprehensive solidification coefficient of the casting machine and the length of the liquid phase cavity, so as to achieve the effect of nail shooting or solidification model calculation. The invention discloses a method for inferring the thickness of the billet shell and the solidification end by studying the low magnification of the continuous casting billet without the need for models and nails, so as to optimize the electromagnetic stirring at the end, the arrangement of the light pressing tooling and the production process, thereby improving the continuous casting. The problem of segregation of cast billets and rolled products.
Description
Technical Field
The invention belongs to the technical field of metal smelting, and particularly relates to a method for calculating the shell thickness of a blank at a position of a continuous casting roller row and the solidification tail end of a casting machine.
Background
Segregation, particularly center segregation, is an important index for evaluating the quality of steel materials, particularly special steel, and poor segregation control brings serious harm to the service performance of steel processing products. In order to improve the center segregation, an electromagnetic stirring and light pressing device is usually arranged at the tail end of a continuous casting machine, but a plurality of steel enterprises generally need to debug the equipment for a long time, and a proper process is not found for some years or even many years, so that the segregation improvement cannot achieve the expected effect. The reason for this is that the thickness of the shell at the solidification end or at the fixed point is not accurate. Generally, a method of shooting a nail or a mathematical model is adopted to find the measured or calculated blank thickness and the solidification end. Both of these approaches have some limitations and difficulties in application. The nail shooting method is to shoot a steel nail containing a sulfide tracer material into a casting blank which is solidifying, and sampling and analyzing corresponding positions of the casting blank. In the technology for judging the thickness of the blank shell, due to the fact that the two-phase region is partially melted and dissolved to foreign steel and sulfide, the problem of fuzzy identification of the two-phase region boundary exists no matter from the shape of a nail or in a sulfur print tracing mode, and different people of the same sample judge that measurement results may have differences. The following difficulties exist in terms of operation: the novel nail shooting device has the advantages that the existing factory building and equipment arrangement is avoided, and the position of shooting nails can be limited; the preparation process is complicated, the thickness of the blank shell at 1 position is usually detected at one time, and if a plurality of positions are required to be carried out together, the preparation workload is multiplied; the firearms are easy to break down, and the bullet deviation condition can occur due to the installation precision or operation reason; sample preparation process is complicated, and processing of samples is more difficult when the samples meet nail deflection. In the aspect of safety, the nail shooting work is dangerous, the operation area is high in temperature, and the fire risk of firearms exists. In addition, the entrusting of nail shooting business of institutions also requires expense. In short, it is not easy to obtain effective data by the nail shooting method.
The utilization of mathematical models is difficult, and the modeling process from now on needs a talent team with expert programming ability and well-known continuous casting solidification professional knowledge, and the programming process usually takes years; the existing model is utilized, and the problems that whether the model is suitable for the current casting machine (difference of square, round, plate type, specification and the like) and whether the physical property parameters are suitable exist; whether grid division representing calculation accuracy is enough or not is judged, if the grid division representing calculation accuracy is too dense, the calculation speed is too slow, and if the grid division representing calculation accuracy is too sparse, the calculation is not accurate enough; whether the boundary conditions are set properly or not, environmental factors may influence the values of certain physical property parameters, which may influence the accuracy of the calculation result and the adaptability of the calculation process to the field.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for calculating the thickness of the shell of the continuous casting roller row position and the solidification tail end of a casting machine without a model and a nail, which aims at the prior art, and can optimize the electromagnetic stirring of the tail end, the arrangement of a tool under light pressure and the production process by researching the low power of the continuous casting billet to deduce the thickness of the shell of the continuous casting roller and the solidification tail end of the continuous casting machine, thereby improving the segregation problem of the continuous casting billet and a rolled material.
The technical scheme adopted by the invention for solving the problems is as follows: a method for calculating the shell thickness of a continuous casting roller row position and the solidification tail end of a casting machine is characterized in that a continuous casting billet has zero plasticity temperature and zero strength temperature in a temperature gradient from the surface to the center of the casting blank in a two-phase region in the solidification process, and cracks are generated at the position when the casting blank is deformed due to mechanical pressure during the period; according to a plurality of production practices and certain observation and analysis experiences of the casting blank, the crack points are in an intermittent linear distribution, and cracks generated at the zero plasticity temperature are relatively heavy. The zero plasticity temperature measured by the high temperature tensile test is approximately equal to the solidus temperature.
By utilizing the rule, the thickness of the billet shell at the position of a pulling and straightening roller (a light press roller) can be obtained by measuring the position of a crack point on the continuous casting billet in a macroscopic manner, and the thickness of the hot billet shell during production can be obtained through certain correction; under the condition of knowing roller row position and pulling speed, the square root formula of solidification law is applied
The position of the coagulation tip can be further solved; thus, the effect of nail shooting or solidification model calculation can be realized.
Compared with the prior art, the invention has the advantages that:
the method has no safety risk; the high-temperature working environment of the shooting nail is severe, and the risk of accidental fire escape or people injury caused by rebound and refraction of firearms also exists;
the method is convenient and quick, and analysis can be completed within half an hour generally (the preparation time of the nail shooting platform support in the early stage of nail shooting is long, more time is needed for later sample preparation, and the model calculation usually needs a computer to run for a plurality of hours);
according to the method, extra cost is not required to be added (the cost is high when a commercial continuous casting solidification mathematical model is purchased, and a certain cost is required when a scientific research institution is entrusted with a nail shooting test), and the sample is not required to be prepared additionally, so that the analysis can be completely carried out on the ready-made conventional production low-power sample;
the method can analyze the influence of the thickness of the billet shell and the change of the solidification tail end caused by the tooling, the environmental conditions and the like in the same metallurgical process (the difference can not be calculated by a mathematical model), so that the continuous casting process is properly adjusted, and the expected metallurgical effect is realized.
Drawings
FIG. 1 is a schematic drawing showing the sampling and processing of a steel ingot of 200X 200 square in the example of the present invention.
FIG. 2 is a schematic view showing the observation and analysis of a cast slab of 200X 200 square in the example of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
Examples are: measuring the distance H between an inner arc and an outer arc of a certain steel casting blank of 200 multiplied by 200 square to be 195mm in low power, wherein the positions of the roller rows are 13.5 meters for a 1# roller, 15 meters for a 2# roller and 16.5 meters for a 3# roller respectively; the continuous casting speed is 1.2 m/min; the casting blank is known to be longitudinally low. And solving the shell thickness of the steel at each roller and the solidification end position of the steel during full solidification in the continuous casting machine process.
According to the known conditions, namely the nominal thickness M of the casting blank is 200mm, and the thickness H of the casting blank in low magnification is 195 mm;
cutting a continuous casting billet low-power sample with the length equivalent to the section size of the casting billet, sawing along the central line of the inner cambered surface and the outer cambered surface to obtain a longitudinal low-power piece with the thickness of 20mm, corroding the continuous casting billet low-power piece with 10-40% of nitric acid aqueous solution in volume percentage for 3-10 minutes after milling, observing the low-power sample by naked eyes or a magnifying glass, finding out point-like cracks layer by layer, and measuring the distance between each layer of crack point and the edge of the casting billet. The distance is the thickness of the blank shell at the position of the pulling and straightening roller (the light pressing roller).
According to the longitudinal low power of the casting blank, the thickness of the blank shell corresponding to each roller on the low power (cold state) is sequentially judged to be 60mm, 75mm and 93mm, and because the casting blank generally exists in a hot state on a continuous casting machine, the thickness of the blank shell needs to be corrected in the hot state, and the specific correction mode is according to the following formula:
in the formula: a is the thickness of the shell at a certain roller measured on the low power (cold state), B is a corrected value, C is the thickness of the shell passing through the certain roller at the moment of production (hot state), M is the nominal thickness of the casting blank, H is the thickness of the casting blank on the low power (inner and outer arc spacing), n is the serial number of the roller row, and the thickness unit is mm.
I.e. a1 ═ 60 mm; b1 ═ 200 + 195 × 60 ÷ 195 ÷ 1.5mm, C1 ═ 60+1.5 ÷ 61.5 mm;
a2 ═ 75 mm; b2 ═ 200 + 195 × 75 ÷ 195 ÷ 1.9mm, C2 ═ 75+1.9 ═ 76.9 mm;
a3 ═ 93 mm; b3 ═ 200-;
namely, the thickness of the shell of the hot casting blank passing through the three rollers is 61.5mm, 76.9mm and 95.4mm in sequence. The results of the calculations are given in the following table
From the above conditions, the comprehensive solidification coefficient can be calculated according to the shell thickness and the pulling rate of the last roll
I.e. the solidification end position of the steel when the process is used on this continuous casting machine is 18.1 meters.
In addition to the above embodiments, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of the claims of the present invention.
Claims (4)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113804482A (en) * | 2021-09-15 | 2021-12-17 | 芜湖新兴铸管有限责任公司 | Method for rapidly detecting solidification tail end position of continuous casting billet |
| CN114858851A (en) * | 2022-03-21 | 2022-08-05 | 江阴兴澄特种钢铁有限公司 | Method for measuring zero strength temperature of steel |
| CN115041649A (en) * | 2022-05-14 | 2022-09-13 | 江阴兴澄特种钢铁有限公司 | Method for slightly pressing solidified tail end of super-large-specification round billet |
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| JP2000015412A (en) * | 1998-06-30 | 2000-01-18 | Nkk Corp | Steel continuous casting method |
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2020
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Non-Patent Citations (1)
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113804482A (en) * | 2021-09-15 | 2021-12-17 | 芜湖新兴铸管有限责任公司 | Method for rapidly detecting solidification tail end position of continuous casting billet |
| CN113804482B (en) * | 2021-09-15 | 2023-07-25 | 芜湖新兴铸管有限责任公司 | Method for rapidly detecting solidification end position of continuous casting billet |
| CN114858851A (en) * | 2022-03-21 | 2022-08-05 | 江阴兴澄特种钢铁有限公司 | Method for measuring zero strength temperature of steel |
| CN115041649A (en) * | 2022-05-14 | 2022-09-13 | 江阴兴澄特种钢铁有限公司 | Method for slightly pressing solidified tail end of super-large-specification round billet |
| CN115041649B (en) * | 2022-05-14 | 2023-10-24 | 江阴兴澄特种钢铁有限公司 | Method for slightly pressing solidification tail end of oversized round billet |
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