CN115094297A - Production method of thick Q420Q steel - Google Patents
Production method of thick Q420Q steel Download PDFInfo
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- CN115094297A CN115094297A CN202210487842.9A CN202210487842A CN115094297A CN 115094297 A CN115094297 A CN 115094297A CN 202210487842 A CN202210487842 A CN 202210487842A CN 115094297 A CN115094297 A CN 115094297A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 59
- 239000010959 steel Substances 0.000 title claims abstract description 59
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000005266 casting Methods 0.000 claims abstract description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000003756 stirring Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 230000004907 flux Effects 0.000 claims description 8
- 239000000498 cooling water Substances 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 6
- 238000003723 Smelting Methods 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 238000009692 water atomization Methods 0.000 claims description 3
- 239000012300 argon atmosphere Substances 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims description 2
- 238000010583 slow cooling Methods 0.000 claims 1
- 238000009827 uniform distribution Methods 0.000 claims 1
- 238000005204 segregation Methods 0.000 abstract description 16
- 238000005096 rolling process Methods 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 8
- 238000009434 installation Methods 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 17
- 238000009749 continuous casting Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
-
- 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
- B22D11/116—Refining the metal
- B22D11/117—Refining the metal by treating with gases
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a production method of thick Q420Q steel, which adopts technical measures on a casting machine, replaces a high-efficiency nozzle, reforms a fan-shaped section water inlet pipe, optimizes the electromagnetic stirring installation position, properly reduces the stirring force, formulates specific process parameters, and ensures that the surface quality of the prepared casting blank is good, the center segregation of the casting blank is light, and the negative segregation 'white and bright band' is weakened, thereby providing a precondition guarantee for rolling the steel plate with excellent quality and over 60mm thickness.
Description
Technical Field
The invention relates to the field of continuous casting in the metallurgical industry, in particular to a production method of thick Q420Q steel.
Background
In recent years, with the development of large span and high strength of highway bridges, the construction conditions are more and more complex, and new higher requirements are provided for the quality of steel, and the stress characteristics and the load of the highway bridges are different from those of railway bridges, particularly the production difficulty of the highway bridges with the thickness of more than 60mm is large, and the main expression is as follows: 1) cracking on the surface of the steel plate. The thick bridge steel has more component alloys and strong crack sensitivity, and even if slight cracks exist on the surface of a casting blank due to large rolling thickness, the cracks can not be welded after the thick steel plate is rolled, so that the steel plate is degraded or even rejected. 2) Flaw detection of the steel plate is not qualified. The thick specification, especially the bridge steel with the rolling thickness of more than 60mm, is required to meet the new energy flaw detection standard, a proper continuous casting process is required to be established to ensure the good metallurgical quality of a plate blank, the control of center segregation is the key point in the production process, for rolling an extra-thick steel plate, the small compression ratio is a great test for ensuring the qualified flaw detection, and when the center segregation of a casting blank is serious, segregants such as C, Mn, S and the like exist in the center corresponding to the rolling thickness, so that the flaw detection process cannot pass; on the other hand, the electromagnetic stirring position and parameters at the steel plate thickness 1/4 are not properly used, so that a serious negative segregation phenomenon appears at the casting blank thickness 1/4, equiaxed crystal bands which are regularly arranged like a mirror surface appear on a negative segregation white bright band, and during ultrasonic flaw detection, ultrasonic waves are reflected back, so that flaw detection is not successful. Therefore, the casting of qualified casting blanks is a prerequisite for obtaining steel plates with excellent quality.
The Chinese patent with the application number of 201811306461.6 discloses a low yield ratio Q420qNH steel plate and a preparation method thereof, and the prepared steel plate has the advantages of low yield ratio, good corrosion resistance, low-temperature toughness and the like, simple process flow, short production period and low production cost through reasonable component design and optimized heating and rolling processes. However, there is no description of how to improve the quality of the cast slab from the start of casting and obtain a steel sheet of acceptable quality.
The Chinese patent with the application number of 201310083385.8 discloses a continuous casting 80mm thick bridge steel Q420qE and a preparation process thereof, the document ensures the cleanliness of steel through reasonable component design and LF + VD process, adopts a high-temperature reactor cooling process to effectively avoid residual stress in the rapid cooling process, simultaneously reduces the hydrogen content in a steel plate, fully realizes the diffusion effect, and improves the flaw detection defect of the steel plate. The steel plate with various performances and qualified quality is obtained on the premise of excellent casting blank quality, but the document does not describe the steel plate.
The Chinese patent with the application number of 202110746594.0 discloses a Q420qENH heat-treatment-free steel plate for bridges and a manufacturing method thereof, measures are taken from smelting, refining, RH, continuous casting, heating and rolling links, heat treatment is not needed, and the Q420qENH steel plate for bridges with the thickness of less than 70mm can be rolled. However, the casting blank prepared in the continuous casting link of the document needs to be cleaned by flame, which indicates that the surface quality problem is not solved.
Disclosure of Invention
The invention aims to provide a production method of thick Q420Q steel, which casts a slab with qualified surface quality and internal quality by improving the technological parameters and equipment conditions of a casting machine and provides a precondition guarantee for rolling the slab into an ultra-thick steel plate with excellent quality of more than 60 mm.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a production method of thick Q420Q steel, which comprises the following chemical components in percentage by mass: 0.08 to 0.10 percent of C, 0.25 to 0.35 percent of Si, 1.5 to 1.6 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.017 to 0.027 percent of Als, 0.0008 to 0.0025 percent of Ca, 0.035 to 0.045 percent of Nb, 0.03 to 0.04 percent of V, 0.006 to 0.016 percent of Ti, and the balance of Fe and inevitable impurities; the specific production process comprises the following steps:
the casting section is 2200 mm by 300 mm;
during casting, water must be uniformly distributed, and the phenomenon of nozzle blockage cannot occur;
properly reducing the electromagnetic stirring intensity during casting, wherein the current value is 300A, and the frequency is 5 Hz; meanwhile, the electromagnetic stirring position is arranged between the 3-section outlet and the 4-section inlet;
smelting the molten steel to ensure that the nitrogen content is less than or equal to 40ppm, and installing a ladle down nozzle argon blowing device on the basis of adopting secondary protective casting by a casting machine, wherein the argon blowing device ensures that the periphery of the ladle down nozzle keeps an argon atmosphere, so that oxygen and nitrogen in the air are prevented from being sucked into the molten steel;
confirm control sector section radian and opening degree includes:
A. the radian error of the roller in the sector section and between the sections is less than or equal to 0.3 mm;
B. and calibrating and adjusting the opening degree of the sector section, and ensuring that the error is not more than 1 mm.
Further, guarantee that fan-shaped section nozzle does not have the jam, adopt the fourth generation novel high-efficient air water atomizing nozzle of smelting company in Beijing, the model: ZYGXPZ-91.
Further, install two cold water additional at fan-shaped section water pipe diameter 1/2 center and spray a parent tube automatic water diversion device, intake before flowing into the parent tube, for two the tunnel via the water distribution piece evenly distributed of parent tube water diversion device entry 1/2 department to equivalent flow direction both sides, guarantee the terminal shape in the inside liquid cavity of casting blank through the evenly distributed of cooling water, show improvement casting blank surface and internal quality.
Further, the superheat degree of the molten steel is controlled to be 15-30 ℃.
Further, the pulling speed is stabilized at 0.8 m/min.
Further, the water quantity of the wide side of the crystallizer is set to 4800L/min, and the water inlet temperature is set to 35-38 ℃; the secondary cooling water temperature is set to be 25-28 ℃, and the specific water amount is set to be 0.62L/kg steel.
Further, the mold flux was of a Stobber 34S-PA1-PE type.
Furthermore, after the casting blank is cut, the casting blank needs to be intensively stacked and slowly cooled for more than 48 hours.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention adopts technical measures on the casting machine, changes the high-efficiency nozzle, reforms the fan-shaped section water inlet pipe, optimizes the electromagnetic stirring installation position and properly reduces the stirring force, formulates targeted process parameters, and ensures that the prepared casting blank has good surface quality, light center segregation of the casting blank and weakened negative segregation white bright band, thereby providing precondition guarantee for rolling the casting blank into an ultra-thick steel plate with excellent quality of more than 60 mm.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a low-magnification result chart of a cast slab of example 1.
FIG. 2 is a low-magnification result chart of the cast slab of example 2.
FIG. 3 is a low-magnification result chart of the cast slab of example 3.
FIG. 4 is a manual flaw detection pattern for the steel plate of example 1.
FIG. 5 is a manual flaw detection map of the steel plate of example 2.
FIG. 6 is a manual flaw detection map of a steel plate of example 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be described in detail and fully below with reference to the embodiments.
In order to evenly distribute water and not block the nozzle, the improved fan-shaped section nozzle is a fourth generation novel high-efficiency air-water atomizing nozzle (model: ZYGXPZ-91) of Beijing Zhongmei company; reform transform fan-shaped section inlet tube: the center of a water inlet pipe diameter 1/2 of the fan-shaped section is additionally provided with two cold water spraying strip base pipe automatic water distribution devices; the electromagnetic stirring positions are set at the 3-stage outlet and the 4-stage inlet, and meanwhile, the weaker stirring force is adopted, the current value is 300A, and the frequency is 5 Hz.
Accurately adjusting the radian and the opening degree of a sector section before casting: the radian error of the roller in the sector section and between the sections is less than or equal to 0.3mm, and the opening degree of the sector section is calibrated and adjusted, so that the error is not more than 1 mm.
Example 1:
the casting section is 2200 multiplied by 300, the crystallizer water is set to be 4800L/min during casting, and the water inlet temperature is 35 ℃; the secondary cooling water has the temperature of 25 ℃ and the specific water amount of 0.62L/kg steel; the superheat degree is controlled to be 15-20 ℃, and the pulling speed is stabilized at 0.8 m/min; the mold flux adopts Sidoberg 34S-PA1-PE mold flux; taking a tundish sample, wherein the nitrogen content is 36 ppm; and after the casting blank is cut, the casting blanks are integrally stacked and slowly cooled for more than 48 hours. The chemical composition is shown in Table 1. The center segregation of the casting blank prepared in the embodiment is graded as C1.0 according to YB/T4003-1997, and FIG. 1 is a result graph of the center segregation of the casting blank in the embodiment. No cracks were observed on the surface of the cast slab obtained in this example by surface inspection.
The steel plate with the thickness of 60mm rolled by the casting blank prepared by the embodiment has good surface quality and qualified performance, and is qualified according to the flaw detection standard of new energy. FIG. 4 is a manual flaw detection map of the present example.
Example 2:
the casting section is 2200 multiplied by 300, the crystallizer water is set to be 4800L/min during casting, and the water inlet temperature is 38 ℃; the secondary cooling water has the temperature of 28 ℃ and the specific water amount of 0.62L/kg steel; the superheat degree is controlled to be 25-30 ℃, and the pulling speed is stabilized at 0.8 m/min; the mold flux adopts Sidoberg 34S-PA1-PE mold flux; taking a tundish sample, wherein the nitrogen content is 43 ppm; and after the casting blank is cut, the casting blanks are integrally stacked and slowly cooled for more than 48 hours. The chemical composition is shown in table 1. The center segregation of the casting blank prepared in the embodiment is graded as C2.0 according to YB/T4003-1997, and FIG. 2 is a result graph of the center segregation of the casting blank in the embodiment. No cracks were observed on the surface of the cast slab obtained in this example by surface inspection.
The steel plate with the thickness of 80mm rolled by the casting blank prepared by the embodiment has good surface quality and qualified various performances, and is qualified according to the flaw detection standard of new energy. FIG. 5 is a manual flaw detection map of the present example.
Example 3:
the casting section is 2200 multiplied by 300, the crystallizer water is set to be 4800L/min during casting, and the water inlet temperature is 36 ℃; the secondary cooling water has the temperature of 27 ℃, and the specific water amount is set to be 0.62L/kg steel; the superheat degree is controlled to be 20-25 ℃, and the pulling speed is stabilized at 0.8 m/min; the mold flux adopts Sidoberg 34S-PA1-PE mold flux; taking a tundish sample, wherein the nitrogen content is 32 ppm; and after the casting blank is cut, the casting blanks are integrally stacked and slowly cooled for more than 48 hours. The chemical composition is shown in table 1. The center segregation of the casting blank prepared in the embodiment is graded as C0.5 according to YB/T4003-1997, and FIG. 3 is a result graph of the center segregation of the casting blank in the embodiment. No cracks were observed on the surface of the cast slab obtained in this example by surface inspection.
The steel plate with the thickness of 100mm rolled by the casting blank prepared by the embodiment has good surface quality and qualified performance, and is qualified according to the flaw detection standard of new energy. FIG. 6 is a manual flaw detection map of the present example.
TABLE 1 chemical composition of each example
| Examples | Steel grade | C | Si | Mn | P | S | Alt | Als | Ca | Nb | V | Ti |
| Example 1 | Q420q | 0.091 | 0.29 | 1.54 | 0.012 | 0.003 | 0.022 | 0.019 | 0.0012 | 0.041 | 0.033 | 0.01 |
| Example 2 | Q420q | 0.082 | 0.25 | 1.51 | 0.011 | 0.002 | 0.02 | 0.018 | 0.0009 | 0.035 | 0.031 | 0.007 |
| Example 3 | Q420q | 0.098 | 0.34 | 1.59 | 0.014 | 0.004 | 0.029 | 0.027 | 0.0023 | 0.044 | 0.038 | 0.015 |
Therefore, the Q420Q bridge steel is cast according to the control method of the invention, the surface quality of the prepared casting blank is crack-free, the center segregation is reduced, the negative segregation white bright band is reduced, the surface quality of the casting blank is excellent after the casting blank is rolled into an extra-thick steel plate with the thickness of more than 60mm, all the performances are qualified, and the new energy flaw detection standard is met.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solution of the present invention is defined by the claims.
Claims (8)
1. The production method of the thick Q420Q steel is characterized in that the thick Q420Q steel comprises the following chemical components in percentage by mass: 0.08 to 0.10 percent of C, 0.25 to 0.35 percent of Si, 1.5 to 1.6 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.017 to 0.027 percent of Als, 0.0008 to 0.0025 percent of Ca, 0.035 to 0.045 percent of Nb, 0.03 to 0.04 percent of V, 0.006 to 0.016 percent of Ti, and the balance of Fe and inevitable impurities; the specific production process comprises the following steps:
the casting section is 2200 mm by 300 mm;
during casting, water must be uniformly distributed, and the phenomenon of nozzle blockage cannot occur;
properly reducing the electromagnetic stirring intensity during casting, wherein the current value is 300A, and the frequency is 5 Hz; meanwhile, the electromagnetic stirring position is arranged between the 3-section outlet and the 4-section inlet;
smelting and treating the molten steel to enable the nitrogen content to be less than or equal to 40ppm, installing a ladle lower nozzle argon blowing device on the basis of adopting secondary protection casting by a casting machine, and enabling the argon blowing device to keep an argon atmosphere around the ladle lower nozzle so as to prevent oxygen and nitrogen in the air from being sucked into the molten steel;
confirm control fan-shaped section radian and opening degree, include:
A. the radian error of the roller in the sector section and between the sections is less than or equal to 0.3 mm;
B. and calibrating and adjusting the opening degree of the sector section, and ensuring that the error is not more than 1 mm.
2. The method for producing the thick Q420Q steel according to claim 1, wherein the non-clogging of the fan-shaped nozzle is ensured, and a fourth-generation novel high-efficiency gas-water atomizing nozzle of Beijing Zhongmei company is adopted, the model is as follows: ZYGXPZ-91.
3. The method for producing the thick Q420Q steel according to claim 1, wherein two cold water spray strip base pipe automatic water diversion devices are additionally installed at the center of a water inlet pipe diameter 1/2 of the segment, inlet water is uniformly distributed into two paths through water diversion pieces at inlets 1/2 of the base pipe water diversion devices before flowing into the base pipe, the two paths flow to two sides in equal amount, the shape of the tail end of a liquid cavity inside the casting blank is guaranteed through uniform distribution of cooling water, and the surface quality and the internal quality of the casting blank are remarkably improved.
4. The method for producing the thick Q420Q steel as claimed in claim 1, wherein the superheat degree of the molten steel is controlled to be 15-30 ℃.
5. The method of producing thick gauge Q420Q steel according to claim 1, wherein the pull rate is stabilized at 0.8 m/min.
6. The method for producing the thick Q420Q steel according to claim 1, wherein the amount of water on the wide side of the crystallizer is set at 4800L/min, and the temperature of inlet water is set at 35-38 ℃; the secondary cooling water temperature is set to be 25-28 ℃, and the specific water amount is set to be 0.62L/kg steel.
7. The method for producing thick Q420Q steel according to claim 1, wherein the mold flux is of the type Stedberg 34S-PA 1-PE.
8. The method for producing the thick Q420Q steel according to claim 1, wherein the slab requires intensive stacking and slow cooling for more than 48 hours after the slab is cut.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101513695A (en) * | 2009-04-03 | 2009-08-26 | 燕山大学 | Welding method of Q420qE grade ultra-low-carbon bainite steel for bridges |
| CN103572023A (en) * | 2013-10-24 | 2014-02-12 | 南京钢铁股份有限公司 | Method for producing ultra-fine grains on surface layer of thick/ultra-thick low-alloy steel plate |
| CN108330399A (en) * | 2018-01-09 | 2018-07-27 | 唐山钢铁集团有限责任公司 | A kind of low-cost and high-performance bridge steel and its production method |
| CN114054707A (en) * | 2021-10-11 | 2022-02-18 | 包头钢铁（集团）有限责任公司 | Method for reducing center segregation of pipeline steel continuous casting billet |
| CN114346194A (en) * | 2021-12-16 | 2022-04-15 | 包头钢铁（集团）有限责任公司 | Q1100D ultrahigh-strength steel casting method |
-
2022
- 2022-05-06 CN CN202210487842.9A patent/CN115094297A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101513695A (en) * | 2009-04-03 | 2009-08-26 | 燕山大学 | Welding method of Q420qE grade ultra-low-carbon bainite steel for bridges |
| CN103572023A (en) * | 2013-10-24 | 2014-02-12 | 南京钢铁股份有限公司 | Method for producing ultra-fine grains on surface layer of thick/ultra-thick low-alloy steel plate |
| CN108330399A (en) * | 2018-01-09 | 2018-07-27 | 唐山钢铁集团有限责任公司 | A kind of low-cost and high-performance bridge steel and its production method |
| CN114054707A (en) * | 2021-10-11 | 2022-02-18 | 包头钢铁（集团）有限责任公司 | Method for reducing center segregation of pipeline steel continuous casting billet |
| CN114346194A (en) * | 2021-12-16 | 2022-04-15 | 包头钢铁（集团）有限责任公司 | Q1100D ultrahigh-strength steel casting method |
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Application publication date: 20220923 |