CN114769545A - Production method for reducing mountain scales on hot-rolled edge of 200-series stainless steel - Google Patents
Production method for reducing mountain scales on 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 44
- 238000009749 continuous casting Methods 0.000 claims abstract description 27
- 239000002893 slag Substances 0.000 claims abstract description 27
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000005098 hot rolling Methods 0.000 claims abstract description 24
- 238000003723 Smelting Methods 0.000 claims abstract description 23
- 238000002791 soaking Methods 0.000 claims abstract description 18
- 238000004321 preservation Methods 0.000 claims abstract description 17
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 9
- 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 26
- 238000000034 method Methods 0.000 description 7
- 239000013078 crystal Substances 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000035882 stress Effects 0.000 description 5
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 239000011572 manganese Substances 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
- 238000000227 grinding Methods 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical class [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 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
- 230000006872 improvement 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
- 230000007246 mechanism Effects 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
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005096 rolling process 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
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation 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
-
- 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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Abstract
The invention discloses a production method for reducing mountain scale on a hot-rolled edge part of 200-series stainless steel, which comprises the following steps: 1) smelting; 2) continuous casting: the casting speed of the continuous casting machine is 1.2 m/min; water quantity of continuous casting machine crystallizer 155m3H; the thickness of the liquid slag layer of the crystallizer covering slag for 200 series stainless steel in the crystallizer is 8mm during casting; 3) hot rolling: immediately sending the casting blank to a hot rolling heating furnace for heat preservation after the casting blank is cast, formed and cut off, and putting the casting blank into the heating furnace at the temperature of 350 ℃; the temperature of a preheating section is 920 ℃, the temperature of a first heating section is 1100 ℃, the temperature of a second heating section is 1240 ℃, and the temperature of a soaking section is 1258 ℃; is heated toThe total time of the two sections and heating is controlled at 92 minutes, and the total heating time in the furnace is 210 minutes. The steps are mutually buckled, and one is not enough, 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 mountain scale on a hot-rolled edge of 200-series stainless steel.
Background
The 200 series austenitic stainless steel is developed by adding manganese and nitrogen into the steel to replace noble metal nickel element on the basis of chromium-nickel series austenitic stainless steel, the austenitic element of the 200 series austenitic stainless steel contains nitrogen besides manganese and proper amount of nickel (4-6 percent) generally, the strength of the austenitic stainless steel is improved, and the 200 series austenitic stainless steel is suitable for equipment and parts which bear heavier load and have low requirements on corrosion resistance.
The high carbon nitrogen 200 series stainless steel is a cheap 200 series stainless steel which is newly developed in China in recent years and is mainly used for civil products such as pipe making, decoration and the like. The standard range (wt.%) of the composition of the high carbon nitrogen 200 series stainless steel is as follows: c: 0.10 to 0.15, Mn: 9-12, Si: 0.3 to 0.7, P: 0.060, S: less than or equal to 0.030, Cr: 13 to 14.5, Ni: 0-2, N: 0.17 to 0.2, Cu: 0.0-0.5, and the balance of iron and trace impurities. The stainless steel has the internal structure stability inferior to that of the original 200 series stainless steel due to the increase of the content of carbon and nitrogen, and the mountain scale (peeling) defect is easy to appear in the steel coil within 100mm from the edge part after the hot-rolled coil is pickled.
At present, the domestic mainstream method for controlling the defects of mountain scale, scale fold or peeling and the like on the edge of stainless steel mainly comprises the steps of grinding the surface of a plate blank by a grinder or descaling by hot rolling descaling equipment. The 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 defects within 100mm of the edge of the steel coil cannot be solved well by adopting the method.
Disclosure of Invention
The invention aims to provide a production method for reducing mountain scale at the edge of a hot-rolled edge of 200-series stainless steel.
The technical scheme for realizing the purpose of the invention is as follows: a production method for reducing mountain scale on a hot-rolled edge part of 200-series stainless steel 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, and controlling the temperature, wherein the casting superheat degree is 25 ℃;
2) continuous casting: wherein the casting speed of the continuous casting machine is 1.2 m/min; the water quantity of the crystallizer of the continuous casting machine is controlled to be 155m3H; during casting, 200 systems of crystallizer covering slag for stainless steel is uniformly added into a crystallizer, and the thickness of the liquid slag layer of the covering slag in the crystallizer is 8 mm;
3) hot rolling: wherein, the casting blank is sent to a hot rolling heating furnace or a heat preservation furnace for heat preservation immediately after being cast, formed and cut off, and the temperature of the plate blank entering the heating furnace is 350 ℃; the heating process of the heating furnace is slowly heated up through 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 stage and the second heating stage is controlled to 92 minutes, and the total heating time in the furnace is 210 minutes.
The inventor does not find a second phase such as inclusion in a defect part and a matrix structure is normal through microscopic analysis of an electron scanning microscope of a large number of mountain scale defect samples within 100mm from the edge of a steel coil, and does not find defects such as cracks and air holes through sampling analysis from the surface of a slab before hot rolling corresponding to the defect position, so that the defects and the peeling defect caused by the original slab surface cracks can be judged to be completely different defects. Moreover, in practice, it is found that the slab has no cracks and cannot avoid the generation of edge mountain scales: the slab blank adopting the conventional process is comprehensively inspected, the slab blank with the crack defect invisible to naked eyes is selected, the surface of the slab blank is uniformly ground by a grinding wheel for 2-3 mm, the surface of the slab blank is ensured to have no crack defect, the slab blank is hot-rolled by adopting the conventional process, the defect rate of mountain scale at the edge is not obviously reduced after the slab blank is inspected by acid pickling, and the defect rate is equivalent to that of the slab blank which is not specially selected.
Further, according to the analysis of the internal structure of the slab, the columnar crystals of the casting blank of the high-carbon-nitrogen 200-series stainless steel are developed, a chilling layer is thin (only 1-2 mm), the bonding force between the columnar crystals is weak, the probability of cracking between the columnar crystals is increased by heating at an overhigh temperature of a hot rolling heating furnace, and the scale appears due to metal deformation in the hot rolling process to form macroscopic scale defects.
Based on the research on the scale (peeling) defect of the 200 series stainless steel hot rolled edge part, the invention adjusts the parameters in the preparation process, and controls the water quantity of the crystallizer to be 155m under the premise of certain superheat degree and casting speed3/h～165m3The columnar crystal size of the casting blank is relatively uniform under the cooling strength; then, the surface temperature of the plate blank entering the heating furnace is 350-650 ℃, and after the plate blank is cooled and then enters the heating furnace for heating, the temperature gradient is too large, and the micro-cracks are caused by the stress between columnar crystal grains; the thickness of the liquid slag layer of the protective slag in the crystallizer is 8-15 mm, which is beneficial to uniform cooling of the slab, improvement of the internal structure and reduction of the stress between casting blank structures; then, in the total heating time of 180-230 minutes, the heating process of the heating furnace adopts slow temperature rise, the temperature of a preheating section is 900-950 ℃, the temperature of a first heating section is 1100-1120 ℃, the temperature of a second heating section is 1240-1255 ℃, and the temperature of a 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 expansion of microcracks on the edge part caused by increase of columnar crystal intercrystalline stress is relieved.
In the process of the invention, each step is annularly buckled, and one of the steps is absent, so that when the casting speed of the continuous casting machine is 1.2 m/min; the water quantity of the crystallizer of the continuous casting machine is controlled at 155m3H; the covering slag isThe thickness of the liquid slag layer in the crystallizer is 8 mm; the temperature of a plate blank of a heating furnace in the hot rolling step is 350 ℃; the temperature of a preheating section of the heating furnace is 920 ℃, the temperature of a first heating section is 1110 ℃, the temperature of a second heating section is 1240 ℃, and the temperature of a soaking section is 1258 ℃; the total time of the first heating stage and the second heating stage is controlled to be 92 minutes, and when the total heating time in the furnace is 210 minutes, the edge scale defects of the high-carbon-nitrogen 200-series stainless steel are finally reduced to 1.55% from 20% -30%, the defect rate is effectively controlled, and the product quality and the market competitiveness are improved.
Detailed Description
The following is a detailed description of the preferred embodiments of the invention.
Example 1:
a production method for reducing mountain scales on a hot-rolled edge part of 200 series stainless steel 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, and controlling the temperature, wherein the casting superheat degree is 25 ℃;
2) continuous casting: wherein the casting speed of the continuous casting machine is 1.2 m/min; the water quantity of the crystallizer of the continuous casting machine is controlled at 155m3H; 200 systems of crystallizer covering slag for stainless steel are uniformly added into a crystallizer during casting, and the thickness of a liquid slag layer of the covering slag in the crystallizer is 8 mm;
3) hot rolling: wherein, the casting blank is sent to a hot rolling heating furnace or a heat preservation furnace for heat preservation immediately after being cast, formed and cut off, and the temperature of the plate blank entering the heating furnace is 350 ℃; the heating process of the heating furnace is slowly heated up through 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 stage and the second heating stage is controlled to 92 minutes, and the total heating time in the furnace is 210 minutes.
Example 2:
a production method for reducing mountain scale on a hot-rolled edge part of 200-series stainless steel 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, and carrying out temperature control treatment, wherein the casting superheat degree is 40 ℃;
2) continuous casting: wherein the casting speed of the continuous casting machine is 1.0 m/min; water quantity control of 160m for continuous casting machine crystallizer3H; 200 systems of crystallizer covering slag for stainless steel are uniformly added into a crystallizer during casting, and the thickness of a liquid slag layer of the covering slag in the crystallizer is 12 mm;
3) hot rolling: wherein, the casting blank is sent to a hot rolling heating furnace or a heat preservation furnace for heat preservation immediately after being cast, formed and cut off, and the temperature of the plate blank entering the heating furnace is 402 ℃; the heating process of the heating furnace is slowly heated up through 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 mountain scales on a hot-rolled edge part of 200 series stainless steel 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, and controlling the temperature, wherein the casting superheat degree is 30 ℃;
2) continuous casting: wherein the casting speed of the continuous casting machine is 1.1 m/min; the water quantity of the crystallizer of the continuous casting machine is controlled to be 165m3H; during casting, 200 systems of crystallizer covering slag for stainless steel is uniformly added into a crystallizer, and the thickness of the liquid slag layer of the covering slag in the crystallizer is 10 mm;
3) hot rolling: wherein, the casting blank is sent to a hot rolling heating furnace or a heat preservation furnace for heat preservation immediately after being cast, formed and cut off, and the temperature of the plate blank entering the heating furnace is 650 ℃; the heating process of the heating furnace is slowly heated up through a preheating section, a first heating section, a second heating section and a soaking section, wherein 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 mountain scale on a hot-rolled edge part of 200-series stainless steel 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, and carrying out temperature control treatment, wherein the casting superheat degree is 33 ℃;
2) continuous casting: wherein the casting speed of the continuous casting machine is 1.06 m/min; the water quantity of the crystallizer of the continuous casting machine is controlled at 163m3H; 200 systems of crystallizer covering slag for stainless steel are uniformly added into a crystallizer during casting, and the thickness of a liquid slag layer of the covering slag in the crystallizer is 11 mm;
3) hot rolling: wherein, the casting blank is sent to a hot rolling heating furnace or a heat preservation furnace for heat preservation immediately after being cast, formed and cut off, and the temperature of the plate blank entering the heating furnace is 455 ℃; the heating process of the heating furnace is slowly heated up through 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 1245 ℃, and the temperature of the soaking section is 1265 ℃; the total time of the first heating stage and the second heating stage is controlled to be 95 minutes, and the total heating time in the furnace is 212 minutes.
Example 5:
a production method for reducing mountain scales on a hot-rolled edge part of 200 series stainless steel 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, and controlling the temperature, wherein the casting superheat degree is 28 ℃;
2) continuous casting: wherein the casting speed of the continuous casting machine is 1.08 m/min; the water quantity of the crystallizer of the continuous casting machine is controlled to be 155m3H; 200 systems of crystallizer covering slag for stainless steel are uniformly added into a crystallizer during casting, and the thickness of a liquid slag layer of the covering slag in the crystallizer is 10 mm;
3) hot rolling: wherein, the casting blank is sent to a hot rolling heating furnace or a heat preservation furnace for heat preservation immediately after being cast, formed and cut off, and the temperature of the plate blank entering the heating furnace is 435 ℃; the heating process of the heating furnace is slowly heated up through a preheating section, a first heating section, a second heating section and a soaking section, wherein the temperature of the preheating section is 910 ℃, the temperature of the first heating section is 1102 ℃, the temperature of the second heating section is 1250 ℃, and the temperature of the soaking section is 1260 ℃; the total time of the first heating stage and the second heating stage is controlled to be 83 minutes, and the total heating time in the furnace is 190 minutes.
The crystallizer casting powder for 200 series stainless steel in this embodiment is a commercially available product, and is not described herein again.
The above-mentioned embodiment was referred to as a 452 coil of 200-series stainless steel strip, and after pickling, the quality inspector visually determined that the degraded coil with the mountain scale defect at the edge was 7 coils and the defect rate was 1.55%. From the practical situation of mass production, the defect rate is effectively controlled.
The casting superheat degree is limited to 25-40 ℃, the casting speed of a continuous casting machine is limited to 1.0-1.2 m/min, and the casting superheat degree is limited to 25-40 ℃, so that good internal structures are formed in the casting blank cooling and forming process, the internal stress is reduced, and the cracking in the subsequent hot rolling and heating rolling process is reduced, and the scale fracture defect is caused; in the heating process of the hot rolling heating furnace, the heating speed of the plate blank is controlled as much as possible, the temperature gradient in the plate blank is reduced, the internal stress is reduced, and cracking is prevented. After a large number of experiments on the heating process of the heating furnace, the inventor finds that the edge crack defect of the hot-rolled steel coil can be caused by too slow heating and too low temperature control, and the edge mountain scale defect rate is obviously increased by too fast heating speed and too high temperature. Therefore, the temperature of the preheating section is 900-950 ℃, the temperature of the first heating section is 1100-1120 ℃, the temperature of the second heating section is 1240-1255 ℃, and the temperature of the soaking section is 1255-1265 ℃. In order to further reduce the defect rate of mountain scale at the edge part, the casting blank is cast, formed and cut off and then is immediately sent to a hot rolling heating furnace or is subjected to heat preservation by adopting a heat preservation furnace (cover) by combining with the mechanism of reducing the internal thermal stress of the plate blank, the temperature of the plate blank entering the heating furnace is controlled to be 350-650 ℃, so that the plate blank core has certain initial temperature when the plate blank enters the heating furnace, and the temperature gradient inside and outside the plate blank is further reduced under the heating of high-temperature flame.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent flow transformations made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (1)
1. A production method for reducing mountain scales on a 200-series stainless steel hot-rolled edge part is characterized by comprising the following steps of: 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, and carrying out temperature control treatment, wherein the casting superheat degree is 25 ℃;
2) continuous casting: wherein the casting speed of the continuous casting machine is 1.2 m/min; the water quantity of the crystallizer of the continuous casting machine is controlled to be 155m3H; 200 systems of crystallizer covering slag for stainless steel are uniformly added into a crystallizer during casting, and the thickness of a liquid slag layer of the covering slag in the crystallizer is 8 mm;
3) hot rolling: wherein, the casting blank is sent to a hot rolling heating furnace or a heat preservation furnace for heat preservation immediately after being cast, formed and cut off, and the temperature of the plate blank entering the heating furnace is 350 ℃; the heating process of the heating furnace is slowly heated up through 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 stage and the second heating stage is controlled to 92 minutes, and the total heating time in the furnace is 210 minutes.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210238868.XA CN114769545B (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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
| CN202210238868.XA CN114769545B (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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| CN114769545A true CN114769545A (en) | 2022-07-22 |
| CN114769545B CN114769545B (en) | 2024-03-01 |
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| CN112387948B (en) | 2022-06-14 |
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| CN114749617A (en) | 2022-07-15 |
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