CN114749618B - Production method for reducing mountain scales at hot rolled edge of 200 series stainless steel - Google Patents
Production method for reducing mountain scales at hot rolled edge of 200 series stainless steel Download PDFInfo
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- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 41
- 239000010935 stainless steel Substances 0.000 title claims abstract description 41
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 118
- 238000005266 casting Methods 0.000 claims abstract description 52
- 238000009749 continuous casting Methods 0.000 claims abstract description 27
- 238000005098 hot rolling Methods 0.000 claims abstract description 27
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000003723 Smelting Methods 0.000 claims abstract description 23
- 238000002791 soaking Methods 0.000 claims abstract description 18
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 13
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 239000002893 slag Substances 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000004321 preservation Methods 0.000 claims abstract description 8
- 230000004907 flux Effects 0.000 claims description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 238000007670 refining Methods 0.000 claims description 7
- 230000007547 defect Effects 0.000 abstract description 24
- 239000000843 powder Substances 0.000 abstract description 3
- 238000005096 rolling process Methods 0.000 abstract description 2
- 238000005520 cutting process Methods 0.000 abstract 1
- 238000009740 moulding (composite fabrication) Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 9
- 239000013078 crystal Substances 0.000 description 6
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 5
- 230000035882 stress Effects 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 238000000227 grinding Methods 0.000 description 4
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000009957 hemming Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical class [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000007431 microscopic evaluation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
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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
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/466—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a non-continuous process, i.e. the cast being cut before rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
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- Metallurgy (AREA)
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Abstract
The invention discloses a production method for reducing 200 series stainless steel hot-rolled edge rolling part mountain scales, which comprises the following steps: 1) Smelting; 2) Continuous casting: the casting speed of the continuous casting machine is 1.06m/min; water quantity 163m of continuous casting machine crystallizer 3 /h; the thickness of a liquid slag layer of the crystallizer casting powder for 200-series stainless steel in the crystallizer is 11mm during casting; 3) And (3) hot rolling: immediately feeding the casting blank into a hot rolling heating furnace for heat preservation after casting, forming and cutting off, and feeding the casting blank into the heating furnace at the temperature of 455 ℃; the temperature of the preheating section is 920 ℃, the temperature of the heating section is 1110 ℃, the temperature of the heating section is 1245 ℃, and the temperature of the soaking section is 1265 ℃; the total time of the first heating section and the second heating section is controlled to be 95 minutes, and the total heating time in the furnace is 212 minutes. The steps are buckled, and the defect is inexhaustible, so that the edge mountain scale defect of the high-carbon nitrogen 200 series stainless steel is reduced from 20-30% to 1.55%.
Description
Technical Field
The invention relates to a stainless steel smelting process, in particular to a production method for reducing 200 series stainless steel hot rolling hemming part mountain scales.
Background
The 200 series austenitic stainless steel is developed by adding manganese and nitrogen to the steel instead of noble metal nickel elements on the basis of chromium-nickel series austenitic stainless steel, and the austenitic elements of the austenitic stainless steel comprise nitrogen besides manganese and proper amount of nickel (4% -6%), so that the strength of the austenitic stainless steel is improved, and the austenitic stainless steel is suitable for equipment and parts which bear heavier loads and have low requirements on corrosion resistance.
The high carbon nitrogen 200 series stainless steel is a cheap 200 series stainless steel newly developed in China in recent years, and is mainly used for civil products such as pipes, decorations and the like. The standard range (wt.%) of the high carbon nitrogen 200 stainless steel composition is: c:0.10 to 0.15, mn:9 to 12, si:0.3 to 0.7, P: less than or equal to 0.060, S: less than or equal to 0.030, cr:13 to 14.5, ni:0 to 2, N:0.17 to 0.2, cu:0.0 to 0.5, and the balance of residual iron and trace impurities. The stainless steel has the advantages that the internal structure stability is inferior to that of the original 200-series stainless steel due to the increase of the carbon and nitrogen contents, and the scale (peeling) defect is very easy to occur within 100mm from the edge of the steel coil after the hot rolled coil is pickled.
At present, the main current method for controlling the defects of side mountain scale, scale fold or skinning and the like of stainless steel in China mainly comprises the steps of grinding the surface of a plate blank by adopting a grinding machine or descaling by adopting hot rolling descaling equipment. These measures are different according to different steel types, but the problem that the high carbon nitrogen 200 series stainless steel is easy to generate mountain scale defect within 100mm of the steel hemming part cannot be well solved by adopting the method.
Disclosure of Invention
The invention aims to provide a production method for reducing 200 series stainless steel hot-rolled edge rolling part mountain scales.
The technical scheme for realizing the aim of the invention is as follows: a production method for reducing 200 series stainless steel hot rolled edge mountain scales comprises the following steps:
1) Smelting: smelting high-carbon nitrogen 200 series stainless steel molten steel with smelting components controlled within a standard range in a refining furnace, controlling temperature, and controlling the casting superheat degree to be 33 ℃;
2) Continuous casting: wherein the casting speed of the continuous casting machine is 1.06m/min; the water quantity of the crystallizer of the continuous casting machine is controlled to be 163m 3 /h; when in casting, casting mold flux for 200 series stainless steel is evenly added into the crystallizer, and the thickness of a liquid slag layer of the mold flux in the crystallizer is 11mm;
3) And (3) hot rolling: the casting blank is immediately sent to a hot rolling heating furnace or is insulated by a heat preservation furnace after being cast, formed and cut off, and the temperature of a plate blank entering the heating furnace is 455 ℃; the heating process of the heating furnace is that the temperature of the preheating section is 920 ℃, the temperature of the heating section is 1110 ℃, the temperature of the heating section is 1245 ℃, and the temperature of the soaking section is 1265 ℃ through the preheating section, the heating section and the soaking section; the total time of the first heating section and the second heating section is controlled to be 95 minutes, and the total heating time in the furnace is 212 minutes.
The inventors have found that the second phase such as inclusions is not present at the defective portion by microscopic analysis of a sample of mountain scale defects within 100mm from the edge of a large number of steel coils, and that the matrix structure is normal, and that defects such as cracks and pinholes are not found by sampling analysis from the surface of the slab before hot rolling corresponding to the defective portion, and therefore it can be judged that the defects are completely different from the peeling defects caused by the original slab surface cracks. In practice, it was found that the slab had no cracks and the generation of edge mountain scales could not be avoided: and (3) comprehensively inspecting the slab by adopting a conventional process, selecting the slab with crack defects invisible to naked eyes, uniformly grinding the surface of the slab by using a grinding wheel for 2-3 mm to ensure that the surface of the slab has no crack defects, and performing hot rolling by adopting the conventional process until the defect rate of the mountain scale at the edge part is not obviously reduced after pickling, wherein the defect rate is equivalent to that of the slab which is not specially selected.
Further, from the analysis of the internal structure of the slab, columnar crystals of the casting blank structure of the high-carbon nitrogen 200 stainless steel are very developed, a chilling layer is thinner (only 1-2 mm), the binding force between the columnar crystals is weaker, the probability of cracking between the columnar crystals is increased through heating at an excessively high temperature of a hot rolling heating furnace, and the scaling occurs due to metal deformation in the hot rolling and calendaring process, so that macroscopic scale defects are formed.
Based on the research on the 200 series stainless steel hot rolling hemming part mountain scale (skinning) defect, the invention adjusts the parameters in the preparation process, and controls the water quantity of the crystallizer to be 155m under the premise of a certain superheat degree and casting speed 3 /h～165m 3 And (h) under the cooling intensity, the columnar crystal size of the casting blank is relatively symmetrical; then, the surface temperature of the plate blank entering the heating furnace is 350-650 ℃, and microscopic cracks are prevented from being generated due to the fact that the temperature gradient is overlarge and the stress among columnar crystals is caused after the plate blank is cooled and then enters the heating furnace for heating; the thickness of the liquid slag layer of the casting powder in the crystallizer is 8-15 mm, which is favorable for uniform cooling of the slab, improves internal tissues and reduces stress among casting blank tissues; then, in the total heating time of 180-230 minutes, the heating process of the heating furnace adopts slow heating, the temperature of the preheating section is 900-950 ℃, the temperature of the heating first section is 1100-1120 ℃, the temperature of the heating second section is 1240-1255 ℃, and the temperature of the soaking section is 1255-1265 ℃; the total time of the first heating section and the second heating section is controlled to be 80-100 minutes, the total heating time in the furnace is 180-230 minutes, the problem of overlarge temperature gradient in the heating process can be relieved through controlling the temperature of the preheating section, and the expansion of microcracks at the edge part due to the increase of the stress between columnar crystals is relieved.
In the technical process, all steps are buckled, so that the casting speed of the continuous casting machine is 1.06m/min; the water quantity of the crystallizer of the continuous casting machine is controlled to be 163m 3 /h; the thickness of the liquid slag layer of the casting powder in the crystallizer is 11mm; hot rolling stepThe temperature of the heating furnace plate blank is 455 ℃; the preheating section temperature of the heating furnace is 920 ℃, the first heating section temperature is 1110 ℃, the second heating section temperature is 1245 ℃, and the soaking section temperature is 1265 ℃; the total time of the first heating section and the second heating section is controlled to be 95 minutes, and when the total heating time in the furnace is 212 minutes, the edge mountain scale defects of the high-carbon nitrogen 200 series stainless steel are finally reduced from 20% -30% to 1.55%, so that the defect rate is effectively controlled, and the product quality and the market competitiveness are improved.
Detailed Description
The following describes the preferred embodiments of the present invention in detail.
Example 1:
a production method for reducing 200 series stainless steel hot rolled edge mountain scales comprises the following steps:
1) Smelting: smelting high-carbon nitrogen 200 series stainless steel molten steel with smelting components controlled within a standard range in a refining furnace, controlling temperature, and controlling the casting superheat degree to be 25 ℃;
2) Continuous casting: wherein the casting speed of the continuous casting machine is 1.2m/min; the water quantity of the crystallizer of the continuous casting machine is controlled to be 155m 3 /h; when in casting, casting mold flux for 200 series stainless steel is evenly added into the crystallizer, and the thickness of a liquid slag layer of the mold flux in the crystallizer is 8mm;
3) And (3) hot rolling: the casting blank is immediately sent to a hot rolling heating furnace or is insulated by a heat preservation furnace after being cast, formed and cut off, and the temperature of a plate blank entering the heating furnace is 350 ℃; the heating process of the heating furnace is slowly heated by a preheating section, a first heating section, a second heating section and a soaking section, wherein the temperature of the preheating section is 920 ℃, the temperature of the first heating section is 1110, the temperature of the second heating section is 1240 ℃, and the temperature of the soaking section is 1258 ℃; the total time of the first heating section and the second heating section is controlled to 92 minutes, and the total heating time in the furnace is 210 minutes.
Example 2:
a production method for reducing 200 series stainless steel hot rolled edge mountain scales comprises the following steps:
1) Smelting: smelting high-carbon nitrogen 200 series stainless steel molten steel with smelting components controlled within a standard range in a refining furnace, controlling temperature, and controlling the casting superheat degree to be 40 ℃;
2) Continuous casting: wherein the casting speed of the continuous casting machine is 1.0m/min; water quantity control of crystallizer of continuous casting machine 160m 3 /h; when in casting, casting mold flux for 200 series stainless steel is evenly added into the crystallizer, and the thickness of a liquid slag layer of the mold flux in the crystallizer is 12mm;
3) And (3) hot rolling: the casting blank is immediately sent to a hot rolling heating furnace or is insulated by a heat preservation furnace after being cast, formed and cut off, and the temperature of a plate blank entering the heating furnace is 402 ℃; the heating process of the heating furnace is carried out by a preheating section, a first heating section, a second heating section and a soaking section, wherein the temperature of the preheating section is 900 ℃, the temperature of the first heating section is 1100 ℃, the temperature of the second heating section is 1245 ℃, and the temperature of the soaking section is 1258 ℃; the total time of the first heating section and the second heating section is controlled to be 80 minutes, and the total heating time in the furnace is 180 minutes.
Example 3:
a production method for reducing 200 series stainless steel hot rolled edge mountain scales comprises the following steps:
1) Smelting: smelting high-carbon nitrogen 200 series stainless steel molten steel with smelting components controlled within a standard range in a refining furnace, controlling temperature, and controlling the casting superheat degree to be 30 ℃;
2) Continuous casting: wherein the casting speed of the continuous casting machine is 1.1m/min; the water quantity of the crystallizer of the continuous casting machine is controlled to be 165m 3 /h; when in casting, casting mold flux for 200 series stainless steel is evenly added into the crystallizer, and the thickness of a liquid slag layer of the mold flux in the crystallizer is 10mm;
3) And (3) hot rolling: the casting blank is immediately sent to a hot rolling heating furnace or is insulated by a heat preservation furnace after being cast, formed and cut off, and the temperature of a plate blank entering the heating furnace is 650 ℃; the heating process of the heating furnace is that the preheating section, the first heating section, the second heating section and the soaking section are heated slowly, the temperature of the preheating section is 950 ℃, the temperature of the first heating section is 1120 ℃, the temperature of the second heating section is 1255 ℃, and the temperature of the soaking section is 1260 ℃; the total time of the first heating section and the second heating section is controlled to be 100 minutes, and the total heating time in the furnace is 230 minutes.
Example 4:
a production method for reducing 200 series stainless steel hot rolled edge mountain scales comprises the following steps:
1) Smelting: smelting high-carbon nitrogen 200 series stainless steel molten steel with smelting components controlled within a standard range in a refining furnace, controlling temperature, and controlling the casting superheat degree to be 33 ℃;
2) Continuous casting: wherein the casting speed of the continuous casting machine is 1.06m/min; the water quantity of the crystallizer of the continuous casting machine is controlled to be 163m 3 /h; when in casting, casting mold flux for 200 series stainless steel is evenly added into the crystallizer, and the thickness of a liquid slag layer of the mold flux in the crystallizer is 11mm;
3) And (3) hot rolling: the casting blank is immediately sent to a hot rolling heating furnace or is insulated by a heat preservation furnace after being cast, formed and cut off, and the temperature of a plate blank entering the heating furnace is 455 ℃; the heating process of the heating furnace is that the temperature of the preheating section is 920 ℃, the temperature of the heating section is 1110 ℃, the temperature of the heating section is 1245 ℃, and the temperature of the soaking section is 1265 ℃ through the preheating section, the heating section and the soaking section; the total time of the first heating section and the second heating section is controlled to be 95 minutes, and the total heating time in the furnace is 212 minutes.
Example 5:
a production method for reducing 200 series stainless steel hot rolled edge mountain scales comprises the following steps:
1) Smelting: smelting high-carbon nitrogen 200 series stainless steel molten steel with smelting components controlled within a standard range in a refining furnace, controlling temperature, and controlling the casting superheat degree to be 28 ℃;
2) Continuous casting: wherein the casting speed of the continuous casting machine is 1.08m/min; the water quantity of the crystallizer of the continuous casting machine is controlled to be 155m 3 /h; when in casting, casting mold flux for 200 series stainless steel is evenly added into the crystallizer, and the thickness of a liquid slag layer of the mold flux in the crystallizer is 10mm;
3) And (3) hot rolling: the casting blank is immediately sent to a hot rolling heating furnace or is insulated by a heat preservation furnace after being cast, formed and cut off, and the temperature of a plate blank entering the heating furnace is 435 ℃; the heating process of the heating furnace is that the temperature of the preheating section is 910 ℃, the temperature of the heating section is 1102 ℃, the temperature of the heating section is 1250 ℃ and the temperature of the soaking section is 1260 ℃ after the heating process of the heating furnace is slowly heated by the preheating section, the heating section and the soaking section; the total time of the first heating section and the second heating section was controlled to 83 minutes, and the total heating time in the furnace was 190 minutes.
The mold flux for stainless steel of the 200 series is a commercial product, and will not be described here.
Concerning the above example, 452 rolls of 200-series stainless steel strip were rolled together, and after pickling, a degraded roll with edge mountain scale defects was 7 rolls and the defect rate was 1.55% as judged by visual inspection by a quality inspector. From the practical situation of mass production, the defect rate is effectively controlled.
The casting superheat degree is limited to 25-40 ℃, and the casting speed of the continuous casting machine is limited to 1.0-1.2 m/min, so that good internal tissues are formed in the casting blank cooling and forming process, the internal stress is reduced, and the occurrence of cracking in the subsequent hot rolling and heating process and the occurrence of scale defects are reduced; in the heating process of the hot rolling heating furnace, the heating speed of the slab is considered to be controlled as much as possible, the temperature gradient in the slab is reduced, the internal stress is reduced, and the cracking is prevented. Through a great deal of experiments on the heating process of the heating furnace, the inventor finds that too slow heating and too low temperature control can lead to edge cracking defects of the hot rolled steel coil, and the edge mountain scale defect rate is remarkably increased due to too fast heating speed and too high temperature. So that the preheating section temperature is 900-950 ℃, the heating section temperature is 1100-1120 ℃, the heating section temperature is 1240-1255 ℃, and the soaking section temperature is 1255-1265 ℃. In order to further reduce the edge mountain scale defect rate, the mechanism of reducing the internal thermal stress of the slab is combined, the casting blank is cast, formed and cut off and then immediately sent to a hot rolling heating furnace or is insulated by adopting an insulating furnace (cover), the temperature of the slab entering the heating furnace is controlled to be 350-650 ℃, and the slab core has a certain initial temperature when the slab enters the heating furnace, so that the internal and external temperature gradients of the slab are further reduced under the heating of high-temperature flame.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent processes or direct or indirect applications in other related technical fields using the content of the present invention are included in the scope of the present invention.
Claims (1)
1. A production method for reducing 200 series stainless steel hot-rolled edge mountain scales is characterized by comprising the following steps: which comprises the following steps:
1) Smelting: smelting high-carbon nitrogen 200 series stainless steel molten steel with smelting components controlled within a standard range in a refining furnace, controlling temperature, and controlling the casting superheat degree to be 33 ℃;
2) Continuous casting: wherein the casting speed of the continuous casting machine is 1.06m/min; the water quantity of the crystallizer of the continuous casting machine is controlled to be 163m 3 /h; when in casting, casting mold flux for 200 series stainless steel is evenly added into the crystallizer, and the thickness of a liquid slag layer of the mold flux in the crystallizer is 11mm;
3) And (3) hot rolling: the casting blank is immediately sent to a hot rolling heating furnace or is insulated by a heat preservation furnace after being cast, formed and cut off, and the temperature of a plate blank entering the heating furnace is 455 ℃; the heating process of the heating furnace is that the temperature of the preheating section is 920 ℃, the temperature of the heating section is 1110 ℃, the temperature of the heating section is 1245 ℃, and the temperature of the soaking section is 1265 ℃ through the preheating section, the heating section and the soaking section; the total time of the first heating section and the second heating section is controlled to be 95 minutes, and the total heating time in the furnace is 212 minutes.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210239216.8A CN114749618B (en) | 2020-11-25 | 2020-11-25 | Production method for reducing mountain scales at hot rolled edge of 200 series stainless steel |
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| CN202011342568.3A CN112387948B (en) | 2020-11-25 | 2020-11-25 | Production method for reducing mountain scale at edge of hot-rolled 200-series stainless steel coil |
| CN202210239216.8A CN114749618B (en) | 2020-11-25 | 2020-11-25 | Production method for reducing mountain scales at hot rolled edge of 200 series stainless steel |
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| CN202011342568.3A Division CN112387948B (en) | 2020-11-25 | 2020-11-25 | Production method for reducing mountain scale at edge of hot-rolled 200-series stainless steel coil |
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| CN114749618A CN114749618A (en) | 2022-07-15 |
| CN114749618B true CN114749618B (en) | 2024-03-01 |
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| CN202011342568.3A Active CN112387948B (en) | 2020-11-25 | 2020-11-25 | Production method for reducing mountain scale at edge of hot-rolled 200-series stainless steel coil |
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| CN114749618A (en) | 2022-07-15 |
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| CN112387948A (en) | 2021-02-23 |
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