CN109382493B - Method for improving peeling defect of hot-rolled pickled plate - Google Patents
Method for improving peeling defect of hot-rolled pickled plate Download PDFInfo
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- CN109382493B CN109382493B CN201811438903.2A CN201811438903A CN109382493B CN 109382493 B CN109382493 B CN 109382493B CN 201811438903 A CN201811438903 A CN 201811438903A CN 109382493 B CN109382493 B CN 109382493B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000007547 defect Effects 0.000 title claims abstract description 21
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 55
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 51
- 238000005266 casting Methods 0.000 claims abstract description 43
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- 229910000616 Ferromanganese Inorganic materials 0.000 claims abstract description 13
- 238000005275 alloying Methods 0.000 claims abstract description 13
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000011572 manganese Substances 0.000 claims abstract description 13
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 12
- 229910000604 Ferrochrome Inorganic materials 0.000 claims abstract description 10
- 238000010079 rubber tapping Methods 0.000 claims abstract description 8
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 7
- 239000011651 chromium Substances 0.000 claims abstract description 7
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000007664 blowing Methods 0.000 claims abstract description 4
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 17
- 230000008569 process Effects 0.000 description 9
- 239000012071 phase Substances 0.000 description 8
- 238000005554 pickling Methods 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 238000009749 continuous casting Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 description 3
- 238000010587 phase diagram Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 230000005501 phase interface Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- 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
- B22D11/18—Controlling or regulating processes or operations for pouring
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
Abstract
The invention discloses a method for improving peeling defects of hot-rolled pickled plates, which comprises the following steps: controlling the content of C in the hot-rolled pickled plate to be less than or equal to 0.10 percent in percentage by weight; when a casting blank is pulled, the tundish temperature is controlled to be 1545-1565 ℃, and the casting blank pulling speed is controlled to be 1.2-1.4 m/min according to the width of the plate blank; controlling the carbon content of converter tapping at 0.03-0.05%, if the carbon content is more than 0.05% during carbon pulling, tapping after the blowing point is below 0.05%; the manganese alloying of the converter adopts medium carbon ferromanganese, and the chromium alloying adopts medium carbon ferrochrome; when the carbon content in the LF incoming molten steel is more than or equal to 0.085 percent, high-carbon ferromanganese is not adopted for manganese preparation. According to the invention, the carbon content of the hot-rolled pickled plate is controlled to be lower than the carbon content range of the peritectic steel reaction area, and the casting temperature and the blank drawing speed in the production process of the hot-rolled pickled plate are controlled, so that the probability of casting blank cracks is reduced, and the probability of the peeling defect of the hot-rolled pickled plate is reduced.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a method for improving the peeling defect of a hot-rolled pickled plate.
Background
The hot-rolled pickled plate is an intermediate product between a cold-rolled plate and a hot-rolled plate, and the hot-rolled pickled plate takes an excellent hot-rolled sheet as a raw material and is subjected to acid pickling to remove a surface oxide layer by an acid pickling unit. The hot-rolled pickled plate has the following advantages: (1) the surface quality of the hot rolled plate is close to that of the cold rolled plate, and the mechanical property of the hot rolled plate is kept; (2) welding, oil coating and painting are convenient to carry out, the product size precision is high, and unevenness can be reduced in the leveling process; (3) compared with cold-rolled sheets, the raw material purchasing cost is low.
In the field production and the subsequent forming and processing processes, the defects that the surface of a hot-rolled pickled plate is easy to peel are found, the defects on the surface of a hot-rolled coil are light, black tongue-shaped grains can be formed after pickling, and the peel can be directly turned over under severe conditions or the peel warping state can be formed in the subsequent forming and processing processes. The defect detection difficulty is very high due to the fact that the running speed of the pickling line is usually high, peeling defects are easily exposed at a user, quality objections can be generated during product handover, and bad influence is caused.
A large number of laboratory studies and production practices prove that cracks on the surface or corners of the continuous casting billet are the main cause of the peeling defects. When the continuous casting billet is heated for a short time, the surface heating temperature is higher than that of other parts, the oxidation time is long, and the edge part is easy to be over-oxidized. If cracks exist on the surface or the corner part of the supplied material slab, the slab cracks contact with air in the heating process, so that elements such as Si, Mn, Cr and the like in the slab are oxidized in different degrees, and the secondary oxidation phenomenon occurs around the iron scale. In the hot rolling process, cracks on the surface of the slab and secondary oxides generated in the heating furnace are bound and remain on the surface of the hot rolled plate, and peeling defects are formed in the subsequent pickling and forming processes.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method for improving the peeling defect of the hot-rolled pickled plate can reduce the peeling defect probability of the hot-rolled pickled plate and improve the surface quality of the hot-rolled pickled plate.
In order to solve the technical problems, the invention adopts the technical scheme that: a method for improving peeling defects of hot-rolled pickled plates comprises the following steps:
controlling the content of C in the hot-rolled pickled plate to be less than or equal to 0.10 percent in percentage by weight;
when a casting blank is pulled, the tundish temperature is controlled to be 1545-1565 ℃, and the casting blank pulling speed is controlled to be 1.2-1.4 m/min according to the width of the plate blank;
controlling the carbon content of converter tapping at 0.03-0.05%, if the carbon content is more than 0.05% during carbon pulling, and tapping after point blowing is carried out until the carbon content is below 0.05%;
the manganese alloying of the converter adopts medium carbon ferromanganese, and the chromium alloying adopts medium carbon ferrochrome;
when the carbon content in the LF incoming molten steel is more than or equal to 0.085 percent, high-carbon ferromanganese is not adopted for manganese preparation.
Further, the method comprises the following steps: when the width of the plate blank is 850-1000 mm, the tundish temperature is 1545-1554 ℃, and the casting blank drawing speed is 1.4 m/min; when the tundish temperature is 1555-1564 ℃, the casting blank drawing speed is 1.3 m/min; when the temperature of the tundish is more than or equal to 1565 ℃, the casting blank drawing speed is 1.2 m/min.
Further, the method comprises the following steps: when the width of the plate blank is 1000-1150 mm, the tundish temperature is 1545-1554 ℃, and the casting blank drawing speed is 1.4 m/min; when the tundish temperature is 1555-1564 ℃, the casting blank drawing speed is 1.3 m/min; when the temperature of the tundish is more than or equal to 1565 ℃, the casting blank drawing speed is 1.2 m/min.
Further, the method comprises the following steps: when the width of the slab is 1150-1350 mm, the tundish temperature is 1545-1554 ℃, and the casting blank drawing speed is 1.3 m/min; when the tundish temperature is 1555-1564 ℃, the casting blank drawing speed is 1.3 m/min; when the temperature of the tundish is more than or equal to 1565 ℃, the casting blank drawing speed is 1.2 m/min.
The invention has the following beneficial effects:
1. according to the invention, the carbon content of the hot-rolled pickled plate is controlled to be lower than the carbon content range of the peritectic steel reaction area, so that the probability of casting blank crack generation is reduced, and the probability of the peeling defect of the hot-rolled pickled plate is reduced;
2. according to the invention, the casting temperature and the blank drawing speed in the production process of the hot-rolled pickled plate are controlled, so that the probability of casting blank cracks is further reduced, and the surface quality of the hot-rolled pickled plate is obviously improved;
3. the invention adopts medium carbon ferromanganese and medium carbon ferrochrome in the manganese alloying and chromium alloying processes, can accurately control the carbon content and prevent the carbon content in the finished product from exceeding the upper limit.
Drawings
FIG. 1 is an iron carbon phase diagram.
FIG. 2 is a drawing speed control graph according to an embodiment of the present invention.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be further described with reference to the accompanying drawings and examples.
As shown in fig. 1, according to the iron-carbon phase diagram, at 1495 ℃, a peritectic reaction δ Fe (g) + L (L) → γ Fe (g) occurs in which δ Fe (wc ═ 0.10%), γ Fe (wc ═ 0.18%) and L (wc ═ 0.53%) 3 phases coexist, and the solidification process is: after molten steel in a peritectic reaction area is poured into a crystallizer, when the temperature of the molten steel close to the wall of the crystallizer is reduced to a liquidus temperature, solid delta Fe is crystallized from the liquid and grows up in a dendritic crystal form; when the temperature of the liquid is lower than 1495 ℃, peritectic reaction occurs, a gamma Fe cladding is formed around the delta Fe dendrite, and a delta Fe + L + gamma Fe three-phase interface is formed; as the temperature continues to decrease, the gamma Fe phase diffuses and grows on the phase interface through carbon atoms, and the delta Fe phase and the liquid phase are continuously consumed until the gamma Fe phase is completely changed.
When delta Fe (g) + L (l) → gamma Fe (g) transformation occurs, the linear shrinkage coefficient is 9.8 x 10 < -5 >/DEG C, while the linear shrinkage coefficient of a delta Fe phase which does not undergo peritectic reaction is 2 x 10 < -5 >/DEG C, the linear shrinkage is large in the phase transformation process, a large gap is generated between a casting blank and the wall of a crystallizer, the heat transfer rate at the gap is reduced, so that local solidification is retarded, the thickness of a blank shell is not uniform, and cracks are easily formed at the weak part. In addition, when a peritectic reaction occurs in the as-grown solidified layer (crystals are connected but a liquid phase remains between crystal grains), a large internal stress is generated due to a large change in specific volume between phases, and thus cracks are easily formed. Therefore, when the carbon content is in the peritectic region, the incidence of ingot cracking is high.
In the iron-carbon phase diagram, carbon steel with the carbon content of 0.10% -0.53% can be subjected to peritectic reaction, but when the carbon content is more than 0.18%, the shrinkage caused by the peritectic reaction is small due to less liquid phase, and the carbon content of a carbon steel ladle crystal region is 0.10% -0.18%.
The invention controls the carbon content in the hot-rolled pickled plate, thereby avoiding the peritectic steel reaction area to reduce the probability of casting blank cracks and further reducing the probability of peeling defects of the hot-rolled pickled plate. In the invention, the content of C in the hot-rolled pickled plate is controlled to be less than or equal to 0.10 percent by weight;
because the heat flux density is increased by the overhigh pouring temperature and the blank drawing speed, the thickness of a blank shell of a casting blank out of a crystallizer is reduced, the capability of the blank shell for bearing external force is reduced, and the probability of crack generation is increased, the pouring temperature and the blank drawing speed are optimized, when the casting blank is drawn, the tundish temperature is controlled to be 1545-1565 ℃, the casting blank drawing speed is controlled according to the width of a plate blank and the steel is poured according to the constant drawing speed as much as possible:
TABLE 1 casting blank drawing speed/m/min
In order to further accurately control the carbon content in the finished hot-rolled pickled plate, the invention also adopts the following method:
controlling the carbon content of converter tapping at 0.03-0.05%, if the carbon content is more than 0.05% during carbon pulling, tapping after the blowing point is below 0.05%;
the manganese alloying of the converter adopts medium carbon ferromanganese, the chromium alloying adopts medium carbon ferrochrome, and the high carbon ferromanganese and the high carbon ferrochrome are strictly forbidden to be adopted for molten steel alloying;
when the carbon content in the LF incoming molten steel is more than or equal to 0.085 percent, strictly prohibiting the adoption of high-carbon ferromanganese for manganese preparation.
Examples
The smelting test of the hot-rolled pickled plate in one furnace is carried out according to the requirements of the invention, and the specific converter charging information is shown in the following table 1:
TABLE 1 converter charging information
| Weight of semisteel | Amount of scrap steel | Total amount of charged | Carbon for charging into furnace | Sulfur charged into furnace | Temperature of entering furnace |
| 135.00 | 0.00 | 135.00 | 3.610 | 0.006 | 1353 |
The converter alloy addition information is shown in table 2:
TABLE 2 converter alloy addition information
| Medium carbon ferromanganese/kg | Ferro-aluminium/kg | High carbon ferrochrome/kg | Medium carbon ferrochrome/kg | Manganese metal/kg | Aluminum wire/m |
| 955 | 500 | / | 510 | 1000 | 300 |
The alloy addition information of the LF furnace is shown in Table 3:
TABLE 3LF furnace alloy addition information
As can be seen from tables 1, 2 and 3, in this example, the medium carbon ferromanganese, the metal manganese and the medium carbon ferrochrome are used to replace the high carbon ferromanganese and the high carbon ferrochrome in the manganese alloying and chromium alloying processes, and the control conditions of the chemical components in the tapped slab are shown in table 4:
TABLE 4 slab chemical composition control/%)
| C | Si | Mn | P | S | Als |
| 0.08 | 0.10 | 1.40 | 0.02 | 0.011 | 0.024 |
As can be seen from Table 4, the C content in the finished slab is 0.08%, which satisfies the requirement of the invention that the C content is less than or equal to 0.10%.
In the subsequent continuous casting process, the casting test of the furnace hot-rolled pickled plate is carried out according to the requirements of the invention on the casting temperature and the casting pulling speed, and the specific casting parameters are shown in the following table 5:
TABLE 5 casting parameters of the casting machine
As can be seen from Table 5, the temperature of the tundish is controlled at 1552 ℃ to meet the requirements of the invention; as can be seen from FIG. 2, the initial drawing speed fluctuates, the constant speed control is basically realized in the later period, and the drawing speed is basically and stably controlled to be about 1.1m/min, which is slower than the requirement of the invention.
And finally, performing off-line batch inspection on the furnace, wherein quality defects such as casting blank cracks and the like are not found, then performing hot rolling and acid pickling on the furnace steel in two coils, and detecting the surface of the furnace steel to find that the surface quality is normal and no peeling defect is found.
The embodiment shows that the method for improving the peeling defect of the hot-rolled pickled plate disclosed by the invention is beneficial to reducing the cracking probability of a casting blank by controlling and optimizing the carbon content, the pouring temperature and the blank drawing speed, so that the surface peeling defect of the hot-rolled pickled plate is obviously improved, the surface quality of the hot-rolled pickled plate is improved, and the method has a good application prospect.
Claims (1)
1. A method for improving peeling defects of hot-rolled pickled plates is characterized by comprising the following steps: the method comprises the following steps:
controlling the content of C in the hot-rolled pickled plate to be less than or equal to 0.10 percent in percentage by weight;
when a casting blank is pulled, the tundish temperature is controlled to be 1545-1565 ℃, and the casting blank pulling speed is controlled to be 1.2-1.4 m/min according to the width of the plate blank;
when the width of the plate blank is 850-1000 mm, the tundish temperature is 1545-1554 ℃, and the casting blank drawing speed is 1.4 m/min; when the tundish temperature is 1555-1564 ℃, the casting blank drawing speed is 1.3 m/min; when the temperature of the tundish is more than or equal to 1565 ℃, the casting blank drawing speed is 1.2 m/min;
when the width of the plate blank is 1000-1150 mm, the tundish temperature is 1545-1554 ℃, and the casting blank drawing speed is 1.4 m/min; when the tundish temperature is 1555-1564 ℃, the casting blank drawing speed is 1.3 m/min; when the temperature of the tundish is more than or equal to 1565 ℃, the casting blank drawing speed is 1.2 m/min;
when the width of the slab is 1150-1350 mm, the tundish temperature is 1545-1554 ℃, and the casting blank drawing speed is 1.3 m/min; when the tundish temperature is 1555-1564 ℃, the casting blank drawing speed is 1.3 m/min; when the temperature of the tundish is more than or equal to 1565 ℃, the casting blank drawing speed is 1.2 m/min;
controlling the carbon content of converter tapping at 0.03-0.05%, if the carbon content is more than 0.05% during carbon pulling, and tapping after point blowing is carried out until the carbon content is below 0.05%;
the manganese alloying of the converter adopts medium carbon ferromanganese, and the chromium alloying adopts medium carbon ferrochrome;
when the carbon content in the LF incoming molten steel is more than or equal to 0.085 percent, high-carbon ferromanganese is not adopted for manganese preparation.
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Application publication date: 20190226 Assignee: XICHANG STEEL VANADIUM CO.,LTD., PANGANG Group Assignor: Chengdu advanced metal material industry technology Research Institute Co.,Ltd. Contract record no.: X2024980001866 Denomination of invention: A method to improve the peeling defect of hot-rolled pickled plates Granted publication date: 20210316 License type: Common License Record date: 20240204 |