CN116024486A - Production method for reducing cold-rolled edge scaling of nickel-saving austenitic stainless steel - Google Patents
Production method for reducing cold-rolled edge scaling of nickel-saving austenitic stainless steel Download PDFInfo
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- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 155
- 238000005266 casting Methods 0.000 claims abstract description 54
- 238000002791 soaking Methods 0.000 claims abstract description 26
- 238000011084 recovery Methods 0.000 claims abstract description 25
- 238000009749 continuous casting Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 16
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 9
- 238000003723 Smelting Methods 0.000 claims description 17
- 238000005520 cutting process Methods 0.000 claims description 11
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 238000005097 cold rolling Methods 0.000 claims 1
- 230000007547 defect Effects 0.000 abstract description 31
- 238000005098 hot rolling Methods 0.000 abstract description 14
- 230000035882 stress Effects 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 9
- 238000007711 solidification Methods 0.000 abstract description 9
- 230000008023 solidification Effects 0.000 abstract description 9
- 238000011068 loading method Methods 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 230000006872 improvement Effects 0.000 abstract description 2
- 230000008646 thermal stress Effects 0.000 abstract description 2
- 239000013078 crystal Substances 0.000 description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 12
- 238000009740 moulding (composite fabrication) Methods 0.000 description 10
- 239000011651 chromium Substances 0.000 description 8
- 239000012535 impurity Substances 0.000 description 8
- 229910052742 iron Inorganic materials 0.000 description 8
- 239000011572 manganese Substances 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 230000003313 weakening effect Effects 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
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- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
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- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
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- 230000008859 change Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000009957 hemming Methods 0.000 description 1
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- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000007431 microscopic evaluation Methods 0.000 description 1
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Abstract
The invention provides a production method for reducing the edge scaling of nickel-saving austenitic stainless steel cold-rolled, which comprises the following steps: according to the mass percentage, the content of the nickel-saving austenitic stainless steel C, cr, mn, N is controlled, and C:0.11% -0.119%; cr:13.65% -14.05%; mn:9.29% -9.69%; n:0.157% -0.177%; (2) continuous casting: (3) heating: and after the continuous casting blank is cast, formed and cut into a plate blank, the plate blank is sent to a heating furnace, and the heating process of the heating furnace is heated by a heat recovery section, a preheating section, a heating section and a soaking section, wherein the total heating time in the furnace is controlled to be 260-265 minutes. Aiming at the problems of surface quality and solidification structure of nickel-saving austenitic stainless steel, the invention adopts a cold charging furnace loading mode to generate more scale defects than hot charging after hot rolling in the initial stage of heating due to larger thermal stress, and provides a control process and an improvement direction for reducing the generation rate of the scale defects in the aspects of reducing the intensity of peritectic reaction, improving the original solidification structure of casting blanks, reducing larger temperature difference stress in the initial stage of heating and the like.
Description
Technical Field
The invention belongs to the field of smelting, continuous casting and heating production, and particularly relates to a production method for reducing cold-rolled edge scaling of nickel-saving austenitic stainless steel.
Background
The nickel-saving austenitic stainless steel is an economic stainless steel formed by replacing nickel with elements such as manganese, nitrogen and the like on the basis of the traditional austenitic stainless steel, has rapid development in China in recent years, and has good mechanical processing performance, good corrosion resistance and a glossy surface as hard conditions for market popularization.
The nickel-saving austenitic stainless steel is a cheap stainless steel newly developed in China in recent years and is mainly applied to civil products. The standard range (wt.%) of the components is: c:0.10 to 0.15 percent of Mn:9% -12%, si:0.3 to 0.7 percent, P is less than or equal to 0.060 percent, S: less than or equal to 0.030 percent, cr:13 to 14.5 percent of Ni: 0-2%, N:0.17 to 0.2 percent, cu:0 to 0.5 percent, and the balance of iron, microelements and impurities. However, although the cost of austenitic stainless steel is reduced by replacing nickel with elements such as manganese, nitrogen and the like, meanwhile, the austenitic stability of the stainless steel is reduced, and the descaling defect easily occurs within 100mm from the edge in the subsequent hot rolling process, so that the mechanical property and corrosion resistance of the plate are negatively influenced, and the economic benefit is influenced.
Because the casting blank in the cold charging mode has a large amount of precipitation at the crystal boundary of a solidification structure in the heating process, the weakening degree of the crystal boundary is larger than that of the casting blank in the hot charging mode, and the temperature difference between the surface and the core is higher than that of the casting blank in the hot charging mode in the initial stage of heating, larger stress concentration can be caused at the edge of the casting blank, so that the sensitivity of the scale defect to the cold charging mode is far higher than that of the scale defect in the hot charging mode, and the scale defect in the hot rolling stage cannot be repaired in the subsequent processing. At present, the main solution to the defects of linear shape, peeling and the like caused by the scaling defect is to adopt a method of grinding the surface of a slab or adopt hot rolling descaling equipment to remove scales. And when the metastable nickel-saving austenitic stainless steel is charged in a cold charging way, more scale defects are generated within 100mm of the steel hemming part, and the problems can not be well solved by adopting the method. The above problems affect the subsequent production and application of the nickel-saving austenitic stainless steel, so that a more suitable processing technology is required to be designed for the cold-charging mode of the nickel-saving austenitic stainless steel.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a production method for reducing the scale on the cold-rolled edge of nickel-saving austenitic stainless steel.
In order to achieve the above object, the technical scheme of the present invention is as follows:
a production method for reducing cold-rolled edge scaling of nickel-saving austenitic stainless steel comprises the following steps:
(1) Smelting: according to the mass percentage, the content of the nickel-saving austenitic stainless steel C, cr, mn, N is controlled, and C:0.11% -0.119%; cr:13.65% -14.05%; mn:9.29% -9.69%; n:0.157% -0.177%;
(2) Continuous casting:
(3) Heating: and (3) casting the continuous casting blank, forming, cutting into slabs, and then conveying the slabs to a heating furnace for heating, wherein the total heating time in the furnace is controlled to be 260-265 minutes.
Further, except C, cr, mn, N, the nickel-saving austenitic stainless steel in the step (1) is controlled in the standard range.
Further, the casting superheat degree in the step (1) is selected to be the lowest value of 25 ℃ within the allowable range.
Further, the withdrawal and straightening temperature of the continuous casting blank in the step (2) is 920-960 ℃.
Further, the temperature of the plate blank fed into the heating furnace in the cold-loading mode in the step (3) is 25 ℃.
Further, in the step (3), the heating process of the heating furnace is heated by a heat recovery section, a preheating section, a first heating section, a second heating section and a soaking section.
Further, in the step (3), the temperature of the heat recovery section is 654-714 ℃, the heating time is 100-109 minutes, the temperature of the preheating section is 853-913 ℃, the heating time is 30-35 minutes, the temperature of the heating section is 1119-1247 ℃, the temperature of the heating section is 1247-1270 ℃, the temperature of the soaking section is 1266-1270 ℃, and the total time of the heating section and the heating section is 80-85 minutes.
Further, cutting off applicable specifications of the slab after casting and forming in the step (3): 11500X 200X 1000mm.
The principle of the invention is as follows:
through carrying out microscopic analysis of an electron scanning microscope on a large number of steel coils with the scale-fold defects in the range of 100mm on the edge, the defect positions are found to be free of inclusion of covering slag and inclusions, matrix tissues near the defects are normal and are not affected by overheat defects, in practice, the scale-fold defects of the steel are found to be generated and are not directly related to the original defects on the surface of a casting blank, a slab produced by a conventional process is selected and uniformly polished on the surface, after the influence of the defects such as cracks on the surface of the slab is eliminated, the slab is heated and rolled by the conventional process, and the scale-fold defects in the area corresponding to the edge are found to be not reduced after pickling.
Further analysis of casting blanks shows that columnar crystals of the nickel-saving austenitic stainless steel are too developed, a chilling fine crystal structure almost does not exist on the surface layer, a large amount of carbide precipitated phases of chromium exist on crystal boundaries of the solidified structure, and a remarkable crystal boundary weakening phenomenon exists. The columnar crystal structure penetrates almost the entire thickness direction, and the grain boundaries between columnar crystals are coarse, and a large number of crystals are precipitated to cause poor bonding force between the columnar crystals. The columnar crystals are extremely easy to crack and cause linear and falling linear scale and mountain scale defects in the heating and hot rolling processes.
Based on the research on the scale defect of the hot rolled edge part of the nickel-saving austenitic stainless steel, aiming at the problem of higher defect rate of the cold charging mode of the steel grade, the production process parameters of the cold charging mode are partially adjusted, firstly, the alloy element components (wt%) of the steel grade are adjusted, C is kept at 0.11-0.119%, cr is kept at 13.65-14.05%, mn is kept at 9.29-9.69%, N is kept at 0.157-0.177%, and the casting superheat degree is 25 ℃; the peritectic point is moved rightwards on component regulation, so that the system steel is far away from severe peritectic reaction in the cooling solidification process, the phenomena of surface dishing, grain boundary cracks and overdeveloped columnar crystals caused by the reaction are avoided to a certain extent, the inter-crystal binding force is improved from the source, and the columnar crystal size of a casting blank is symmetrical by matching with certain superheat degree, casting speed and proper cooling strength, so that the surface quality of the original casting blank is improved, and a better original solidification structure of the casting blank is obtained; setting the withdrawal and straightening temperature to 920-960 ℃, and avoiding the brittleness temperature range of 750-900 ℃ of the nickel-saving austenitic stainless steel; and then, in order to prevent the temperature gradient inside and outside the casting blank from being larger after the casting blank is heated in a cold charging mode, a stress concentration area is generated at the edge of the casting blank, and columnar crystals are damaged to cause microscopic cracks, so that a heat recovery section and a preheating section with temperature difference stress concentration are adjusted, wherein the temperature of the heat recovery section is 654-714 ℃, the heating time is 100-109 minutes, the temperature of the preheating section is 853-913 ℃, the heating time is 30 minutes, slow temperature rise is adopted in the heating process of the heating furnace, the problem that the temperature gradient is overlarge at the initial heating stage due to the fact that the temperature difference between the casting blank and the heating furnace is overlarge under the condition of 25 ℃ in cold charging can be relieved through the control of the temperature of the heat recovery section and the preheating section, and the expansion of microcracks at the edge of the columnar crystals due to the stress increase of the columnar crystals is slowed down. And the heating system can enable a large amount of precipitated phases existing in the crystal boundary of the solidification structure of the casting blank in a cold-filling mode to be fused into the matrix as much as possible, so that the weakening degree of the crystal boundary is reduced. The steps in the technological process are looped, so that the defect of edge scale fold of the nickel-saving austenitic stainless steel during cold loading is reduced from 22.66% to within 2.02%, the defect rate is effectively controlled, and the product quality and market competitiveness are improved.
Compared with the prior art, the invention has the beneficial effects that:
1) According to the invention, the influence angles of different alloy components on the phase change parameters are realized, the alloy components of the nickel-saving austenitic stainless steel are optimized, the sensitivity of the scale-fold defect to the cold charging mode and the subsequent processing is reduced, and a good optimizing effect is achieved.
2) According to the invention, a drawing straightening temperature region is designed according to the angle of the brittleness temperature region of the nickel-saving austenitic stainless steel, and a good effect is achieved on reducing the sensitivity of scale defects.
3) The invention quickens the integration of the precipitated phase into the matrix, reduces the weakening degree of the grain boundary and reduces the angle of the temperature difference stress at the edge part at the initial heating stage of the cold loading mode, and provides a heating system for reducing the sensitivity of the scale-fold defects by adjusting the heating temperature and time interval of the heat recovery section and reducing the heating speed of the preheating section under the condition that the cold loading mode, namely 25 ℃, thereby providing a direction for optimizing the heating system of the cold loading mode.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1:
the production method for reducing the cold-rolled edge scaling of the nickel-saving austenitic stainless steel comprises the following steps:
1) Smelting: smelting components (wt.%): 0.11% of C, 13.65% of Cr, 9.29% of Mn, 0.157% of N, 1.24% of Ni, 0.41% of Si, 0.31% of Cu, 0.0009% of B, and the balance of iron and microscopic impurities. The casting superheat degree is 25 ℃;
2) Continuous casting: the withdrawal and straightening temperature of the casting blank is 960 ℃;
3) Heating: casting blank, casting, forming and cutting into slabs (with the specification of 11500 multiplied by 200 multiplied by 1000 mm), immediately conveying the slabs to a hot rolling heating furnace for heating, wherein the temperature of the slabs conveyed to the heating furnace is 25 ℃; the heating process of the heating furnace is slowly heated by a heat recovery section, a preheating section, a heating section and a soaking section, wherein the temperature of the heat recovery section is 654 ℃, the heating time is 100 minutes, the temperature of the preheating section is 853 ℃, and the heating time is 30 minutes; the first section of heating temperature is 1119 ℃, the second section of heating temperature is 1247 ℃, the soaking section of heating temperature is 1266 ℃, the total time of the first section and the second section of heating is 80 minutes, and the soaking section of heating time is 50 minutes.
Example 2:
the production method for reducing the cold-rolled edge scaling of the nickel-saving austenitic stainless steel comprises the following steps:
1) Smelting: smelting components (wt.%): 0.119% of C, 14.05% of Cr, 9.69% of Mn, 0.177% of N, 1.24% of Ni, 0.41% of Si, 0.31% of Cu, 0.0009% of B, and the balance of iron and microscopic impurities. The casting superheat degree is 25 ℃;
2) Continuous casting: the withdrawal and straightening temperature of the casting blank is 960 ℃;
3) Heating: casting blank, casting, forming and cutting into slabs (with the specification of 11500 multiplied by 200 multiplied by 1000 mm), immediately conveying the slabs to a hot rolling heating furnace for heating, wherein the temperature of the slabs conveyed to the heating furnace is 25 ℃; the heating process of the heating furnace is slowly heated by a heat recovery section, a preheating section, a heating section and a soaking section, wherein the temperature of the heat recovery section is 684 ℃, the heating time is 100 minutes, the temperature of the preheating section is 883 ℃, and the heating time is 30 minutes; the first section of heating temperature is 1119 ℃, the second section of heating temperature is 1247 ℃, the soaking section of heating temperature is 1266 ℃, the total time of the first section and the second section of heating is 85 minutes, and the soaking section of heating time is 50 minutes.
Example 3:
the production method for reducing the cold-rolled edge scaling of the nickel-saving austenitic stainless steel comprises the following steps:
1) Smelting: smelting components (wt.%): 0.115% of C, 13.85% of Cr, 9.49% of Mn, 0.157% of N, 1.24% of Ni, 0.41% of Si, 0.31% of Cu, 0.0009% of B, and the balance of iron and microscopic impurities. The casting superheat degree is 25 ℃;
2) Continuous casting: the withdrawal and straightening temperature of the casting blank is 960 ℃;
3) Heating: casting blank, casting, forming and cutting into slabs (with the specification of 11500 multiplied by 200 multiplied by 1000 mm), immediately conveying the slabs to a hot rolling heating furnace for heating, wherein the temperature of the slabs conveyed to the heating furnace is 25 ℃; the heating process of the heating furnace is slowly heated up through a heat recovery section, a preheating section, a heating section and a soaking section, wherein the temperature of the heat recovery section is 714 ℃, the heating time is 100 minutes, the temperature of the preheating section is 913 ℃, and the heating time is 30 minutes; the temperature of the first heating section is 1150 ℃, the temperature of the second heating section is 1250 ℃, the temperature of the soaking section is 1266 ℃, the total time of the first heating section and the second heating section is 80 minutes, and the time of the soaking section is 50 minutes.
Example 4:
the production method for reducing the cold-rolled edge scaling of the nickel-saving austenitic stainless steel comprises the following steps:
1) Smelting: smelting components (wt.%): 0.11% of C, 14.05% of Cr, 9.29% of Mn, 0.177% of N, 1.24% of Ni, 0.41% of Si, 0.31% of Cu, 0.0009% of B, and the balance of iron and microscopic impurities. The casting superheat degree is 25 ℃;
2) Continuous casting: the withdrawal and straightening temperature of the casting blank is 920 ℃;
3) Heating: immediately feeding the cast blank into a hot rolling heating furnace for heating after casting, forming and cutting the cast blank into a plate blank, wherein the temperature of the plate blank fed into the heating furnace is 25 ℃; the heating process of the heating furnace is slowly heated up through a heat recovery section, a preheating section, a heating section and a soaking section, wherein the temperature of the heat recovery section is 714 ℃, the heating time is 100 minutes, the temperature of the preheating section is 913 ℃, and the heating time is 30 minutes; the temperature of the first heating section is 1150 ℃, the temperature of the second heating section is 1250 ℃, the temperature of the soaking section is 1266 ℃, the total time of the first heating section and the second heating section is 85 minutes, and the time of the soaking section is 50 minutes.
Example 5:
the production method for reducing the cold-rolled edge scaling of the nickel-saving austenitic stainless steel comprises the following steps:
1) Smelting: smelting components (wt.%): 0.119% of C, 14.05% of Cr, 9.29% of Mn, 0.177% of N, 1.24% of Ni, 0.41% of Si, 0.31% of Cu, 0.0009% of B, and the balance of iron and microscopic impurities. The casting superheat degree is 25 ℃;
2) Continuous casting: the withdrawal and straightening temperature of the casting blank is 930 ℃;
3) Heating: immediately feeding the cast blank into a hot rolling heating furnace for heating after casting, forming and cutting the cast blank into a plate blank, wherein the temperature of the plate blank fed into the heating furnace is 25 ℃; the heating process of the heating furnace is slowly heated up through a heat recovery section, a preheating section, a heating section and a soaking section, wherein the temperature of the heat recovery section is 714 ℃, the heating time is 100 minutes, the temperature of the preheating section is 913 ℃, and the heating time is 30 minutes; the temperature of the first heating section is 1119 ℃, the temperature of the second heating section is 1260 ℃, the temperature of the soaking section is 1266 ℃, the total time of the first heating section and the second heating section is 80 minutes, and the time of the soaking section is 55 minutes.
Example 6:
the production method for reducing the cold-rolled edge scaling of the nickel-saving austenitic stainless steel comprises the following steps:
1) Smelting: smelting components (wt.%): 0.11% of C, 14.05% of Cr, 9.29% of Mn, 0.177% of N, 1.24% of Ni, 0.41% of Si, 0.31% of Cu, 0.0009% of B, and the balance of iron and microscopic impurities. The casting superheat degree is 25 ℃;
2) Continuous casting: the withdrawal and straightening temperature of the casting blank is 940 ℃;
3) Heating: immediately feeding the cast blank into a hot rolling heating furnace for heating after casting, forming and cutting the cast blank into a plate blank, wherein the temperature of the plate blank fed into the heating furnace is 25 ℃; the heating process of the heating furnace is slowly heated up through a heat recovery section, a preheating section, a heating section and a soaking section, wherein the temperature of the heat recovery section is 714 ℃, the heating time is 100 minutes, the temperature of the preheating section is 913 ℃, and the heating time is 30 minutes; the first section of heating temperature is 1119 ℃, the second section of heating temperature is 1247 ℃, the soaking section of heating temperature is 1270 ℃, the total time of the first section and the second section of heating is 85 minutes, and the soaking section of heating time is 50 minutes.
Example 7:
the production method for reducing the cold-rolled edge scaling of the nickel-saving austenitic stainless steel comprises the following steps:
1) Smelting: smelting components (wt.%): 0.11% of C, 14.05% of Cr, 9.29% of Mn, 0.177% of N, 1.24% of Ni, 0.41% of Si, 0.31% of Cu, 0.0009% of B, and the balance of iron and microscopic impurities. The casting superheat degree is 25 ℃;
2) Continuous casting: the withdrawal and straightening temperature of the casting blank is 950 ℃;
3) Heating: immediately feeding the cast blank into a hot rolling heating furnace for heating after casting, forming and cutting the cast blank into a plate blank, wherein the temperature of the plate blank fed into the heating furnace is 25 ℃; the heating process of the heating furnace is slowly heated up through a heat recovery section, a preheating section, a heating section and a soaking section, wherein the temperature of the heat recovery section is 714 ℃, the heating time is 100 minutes, the temperature of the preheating section is 913 ℃, and the heating time is 30 minutes; the temperature of the first heating section is 1150 ℃, the temperature of the second heating section is 1260 ℃, the temperature of the soaking section is 1270 ℃, the total time of the first heating section and the second heating section is 80 minutes, and the time of the soaking section is 50 minutes.
The other processes in the embodiment are conventional processes, namely 4406 rolls of nickel-saving austenitic stainless steel strip are rolled together in the embodiment, and after pickling, a quality inspector visually observes and judges that 89 rolls of degraded rolls with edge descaling defects appear, and the defect rate is 2.02%. From the practical situation of mass production, the defect rate is effectively controlled.
According to the invention, C is kept at 0.11% -0.119%, cr is kept at 13.65% -14.05%, mn is kept at 9.29% -9.69%, N is kept at 0.157% -0.177%, the casting superheat degree is 25 ℃, and the method is used for avoiding severe peritectic reaction in the casting blank cooling and forming process so as to form a good solidification structure, reducing grain boundary cracks and surface pits, reducing the development degree of columnar crystals, and obtaining an original casting blank with better quality in a cold charging furnace manner as much as possible; setting the straightening temperature of the drawn blank at 920-960 ℃, and avoiding the brittleness temperature range of 750-900 ℃ of the nickel-saving austenitic stainless steel; in the heating process, considering the problem of stress concentration of a heat recovery section and a preheating section in the initial heating stage caused by the fact that the temperature difference between the casting blank and the heating furnace is kept at 25 ℃ in a cold charging mode, the temperature of the heat recovery section is set to be 654-714 ℃, the heating time is 100 minutes, the temperature of the preheating section is set to be 853-913 ℃, and the heating time is 30 minutes. The internal and external temperature gradients of the casting blank are controlled to be about 280 ℃, the temperature gradients of the center and the edge of the slab are reduced, the temperature difference stress is reduced, cracking is avoided, the grain boundary weakening angle caused by grain boundary precipitation phase is reduced, and the influence of the temperature difference stress and the grain boundary weakening on the quality of the casting blank is reduced as much as possible. Aiming at the problems of the nickel-saving austenitic stainless steel that the surface quality and solidification structure exist, and the hot rolling process generates more scale defects than hot rolling process due to larger thermal stress in the initial heating stage in a cold charging furnace loading mode, the invention provides the angles of reducing the intensity of peritectic reaction, improving the original solidification structure of casting blank, reducing larger temperature difference stress in the initial heating stage and the like, and provides a control process and an improvement direction for reducing the generation rate of the scale defects.
The technical scheme of the invention is explained in the technical scheme, the protection scope of the invention cannot be limited by the technical scheme, and any changes and modifications to the technical scheme according to the technical substance of the invention belong to the protection scope of the technical scheme of the invention.
Claims (7)
1. The production method for reducing the edge scaling of the cold-rolled nickel-saving austenitic stainless steel is characterized by comprising the following steps of:
(1) Smelting: according to the mass percentage, the content of the nickel-saving austenitic stainless steel C, cr, mn, N is controlled, and C:0.11% -0.119%; cr:13.65% -14.05%; mn:9.29% -9.69%; n:0.157% -0.177%;
(2) Continuous casting:
(3) Heating: and (3) casting the continuous casting blank, forming, cutting into slabs, and then conveying the slabs to a heating furnace for heating, wherein the total heating time in the furnace is controlled to be 260-265 minutes.
2. The method for reducing scaling at cold-rolled edges of nickel-saving austenitic stainless steel according to claim 1, wherein the degree of superheat of the casting in step (1) is selected to be a minimum of 25 ℃ within an allowable range.
3. The production method for reducing cold-rolled edge scaling of nickel-saving austenitic stainless steel according to claim 1, wherein the withdrawal temperature of the continuous casting blank in the step (2) is 920-960 ℃.
4. The method for reducing scaling at cold-rolled edges of nickel-saving austenitic stainless steel according to claim 1, wherein the slab temperature fed into the heating furnace in the cold-rolling mode in step (3) is 25 ℃.
5. The production method for reducing the cold-rolled edge scaling of the nickel-saving austenitic stainless steel according to claim 1, wherein the heating process of the heating furnace in the step (3) is heated by heating through a heat recovery section, a preheating section, a first heating section, a second heating section and a soaking section.
6. The method for reducing edge scaling in cold-rolled austenitic nickel-saving stainless steel according to claim 5, wherein the heat recovery section is 654-714 ℃, the heating time is 100-109 minutes, the preheating section is 853-913 ℃, the heating time is 30-35 minutes, the first heating section is 1119-1247 ℃, the second heating section is 1247-1270 ℃, the soaking section is 1266-1270 ℃, and the total heating time is 80-85 minutes.
7. The method for reducing scaling at cold-rolled edges of nickel-saving austenitic stainless steel according to claim 1, wherein the following casting and forming steps (3) are characterized by cutting off the applicable specifications of the slab: 11500X 200X 1000mm.
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