CN114570897A - NM450 casting blank production method - Google Patents
NM450 casting blank production method Download PDFInfo
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- CN114570897A CN114570897A CN202210134162.9A CN202210134162A CN114570897A CN 114570897 A CN114570897 A CN 114570897A CN 202210134162 A CN202210134162 A CN 202210134162A CN 114570897 A CN114570897 A CN 114570897A
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- 238000005266 casting Methods 0.000 title claims abstract description 60
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 40
- 239000010959 steel Substances 0.000 claims abstract description 40
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 26
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 15
- 229910052786 argon Inorganic materials 0.000 claims abstract description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 238000007664 blowing Methods 0.000 claims abstract description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 7
- 239000001301 oxygen Substances 0.000 claims abstract description 7
- 239000012300 argon atmosphere Substances 0.000 claims abstract description 4
- 230000001681 protective effect Effects 0.000 claims abstract description 4
- 238000010521 absorption reaction Methods 0.000 claims abstract description 3
- 239000000498 cooling water Substances 0.000 claims abstract description 3
- 230000009467 reduction Effects 0.000 claims description 7
- 238000005096 rolling process Methods 0.000 claims description 7
- 238000010583 slow cooling Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 4
- 229910052758 niobium Inorganic materials 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 7
- 238000005204 segregation Methods 0.000 abstract description 6
- 230000000052 comparative effect Effects 0.000 description 12
- 230000000694 effects Effects 0.000 description 7
- 230000008901 benefit Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- 229910000617 Mangalloy Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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Classifications
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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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
-
- 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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/58—Pouring-nozzles with gas injecting means
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a NM450 casting blank production method, which comprises the following steps: 1) the method for controlling the surface quality of the casting blank comprises the following steps: 1.1) protective casting is well done, oxygen absorption and nitrogen increase of molten steel are prevented, and the content of nitrogen element is ensured not to exceed 50 ppm; installing a ladle down nozzle argon blowing device, wherein the argon blowing device enables the periphery of the ladle down nozzle to keep an argon atmosphere, and oxygen and nitrogen in air are prevented from being sucked into molten steel; argon is blown between the tundish upper nozzle and the submerged nozzle; 1.2) the secondary cooling water adopts weak cooling, and the specific water amount is 0.36-0.40L/kg steel; 1.3) the water quantity of a crystallizer is 4800L/min, and the water temperature is controlled to be 35-38 ℃; 1.4) accurately adjusting the accuracy of the roller of the sector section, wherein the radian is less than or equal to 0.3 mm. According to the invention, by optimizing the casting parameters of the casting machine process, the prepared casting blank has no surface cracks, the center segregation of the casting blank is obviously reduced, and the low-power rating of the casting blank is more than the C system level 1.0 according to YB/T4003-1997.
Description
Technical Field
The invention relates to the technical field of continuous casting in the metallurgical industry, in particular to a method for producing an NM450 casting blank.
Background
NM450 is a novel wear-resistant steel, compared with the traditional wear-resistant metal materials such as nodular cast iron and high manganese steel, the wear-resistant steel has good obdurability and wear resistance, can bear medium-strength impact wear, and along with the rapid development of the heavy industry in China, the current NM450 steel plate is widely applied in the fields of mining machinery, water conservancy equipment, rail transit, national defense military industry and the like, the market demand is increased day by day, and the wear-resistant steel has good economic benefit and social benefit. However, the production of wear-resistant steel is difficult, not only is the comprehensive mechanical properties such as hardness and wear resistance difficult to guarantee, but also delayed cracks are generated when the steel plate is cut by flame. The defects can be partially alleviated by adopting a heat treatment process and an optimized steel plate cutting method, but the problem needs to be solved fundamentally and the center segregation of the casting blank needs to be improved from casting. Since the steel contains Nb, Ti and other alloys, surface cracks are easily generated on the surface of a casting blank, and the surface of a steel plate after being rolled into a steel plate is cracked, so that the steel plate cannot be used. The root cause of the above defects in the steel sheet is defects in the quality of the cast slab used for rolling the steel sheet, and therefore, casting a cast slab having excellent internal and external quality by a casting machine is a prerequisite for solving the above defects in the steel sheet.
The Chinese patent with the application number of 201710204563.6 discloses a method for producing thin-gauge wear-resistant steel 450 by a hot continuous rolling ultrafast cooling process, and the document controls microstructure by ultrafast cooling quenching after rolling through reasonable alloying design, fully exerts the performance strengthening effect of alloy, improves the strength and toughness ratio of steel and reduces the production cost. However, this document does not give any details about how slabs with good internal and external quality can be cast by casting machines, and the method described in this document makes it difficult to ensure the quality of the cast slab.
The Chinese patent with the application number of 201610642720.7 discloses wear-resistant steel with the Brinell hardness of 450 and a manufacturing method thereof, and the method disclosed by the document has the advantages that the residual stress uniformity of the wear-resistant steel is good, the wear resistance is good, and cracking and deformation do not occur in the using process through the component design and the heat treatment process, so that the service life of the wear-resistant steel is prolonged. However, there is no description on how to improve the quality of the inside and outside of a cast slab from the casting angle of a casting machine to produce a cast slab having excellent quality to satisfy various properties after rolling into a steel sheet.
Disclosure of Invention
The invention aims to provide an NM450 casting blank production method, which ensures that the prepared casting blank has no surface cracks and the center segregation of the casting blank is obviously reduced by optimizing the casting parameters of a casting machine process, and the low-power rating of the casting blank is more than the C system 1.0 according to YB/T4003-1997.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a NM450 casting blank production method, which comprises the following steps:
1) the casting blank surface quality control method comprises the following steps:
1.1) protective casting is well carried out, oxygen absorption and nitrogen increase of molten steel are prevented, and the content of nitrogen elements is not more than 50 ppm;
installing a ladle down nozzle argon blowing device, wherein the argon blowing device keeps the argon atmosphere around the ladle down nozzle, and oxygen and nitrogen in the air are prevented from being sucked into molten steel; argon is blown between the tundish upper nozzle and the submerged nozzle;
1.2) the secondary cooling water adopts weak cooling, and the specific water amount is 0.36-0.40L/kg steel;
the water amount in each area is shown in table 1:
TABLE 1 amount of water in each zone of secondary cooling during NM450 casting
1.3) the water quantity of a crystallizer is 4800L/min, and the water temperature is controlled to be 35-38 ℃;
1.4) accurately adjusting the accuracy of the roller of the sector section, wherein the radian is less than or equal to 0.3 mm.
Further, the method also comprises the following steps:
2) the method for controlling the internal quality of the casting blank comprises the following steps:
2.1) adopting constant pulling speed, stabilizing at 0.9m/min, adopting terminal soft reduction under soft reduction, wherein the reduction amount reaches 1.2 mm/m;
2.2) electromagnetic stirring adopts a double-roller type, the double-roller type electromagnetic stirring device is arranged at an outlet of 3 sections and an inlet of 4 sections, and the current adopts the high current 380A and the frequency is 5 Hz;
2.3) ensuring the opening degree of the sector section, wherein the error is less than or equal to 1.0 mm;
2.4) directly discharging the casting blank into a slow cooling pit after the casting blank is cut, wherein hot charging is not required, a burner is arranged in the slow cooling pit, the burner is ignited before discharging, and the pit is filled with a rear cover; and after slowly cooling for 72 hours, the steel plate can be subjected to furnace rolling.
Further, in the step 1.2), the water temperature is controlled to be 26-28 ℃.
Further, the NM450 wear-resistant steel comprises the following chemical components in percentage by mass: 0.19 to 0.21 percent of C, 0.2 to 0.3 percent of Si, 1.15 to 1.25 percent of Mn, less than or equal to 0.012 percent of P, less than or equal to 0.005 percent of S, 0.65 to 0.75 percent of Cr, 0.015 to 0.025 percent of Nb, 0.017 to 0.027 percent of Als, 0.0010 to 0.0025 percent of Ca, 0.001 to 0.002 percent of B, and the balance of Fe and inevitable impurities.
Further, the casting section of the NM450 wear-resistant steel is 2000 x 250 mm.
Compared with the prior art, the invention has the beneficial technical effects that:
when the NM450 is cast by the casting machine, a reasonable casting process is adopted, the surface quality of the prepared casting blank is good, the center segregation is light, the low-power rating of the continuous casting blank is over the C system 1.0 level according to YB/T4003-1997, the internal and external quality of the casting blank is obviously improved, and the guarantee is provided for the subsequent rolling of a steel plate with excellent performance, no delayed crack and good surface quality.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 shows the macroscopic effects of the cast slab of example 1 of the present invention.
FIG. 2 shows the macroscopic effect of the cast slab in example 2 of the present invention.
FIG. 3 shows the low-magnification effect of the cast slab in example 3 of the present invention.
FIG. 4 shows the low effect of the cast slab of comparative example 1.
FIG. 5 shows the low effect of the cast slab of comparative example 2.
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.
Table 2 shows the chemical compositions of the examples and comparative examples:
table 2 chemical compositions (% by mass) of examples 1 to 3 and comparative examples 1 to 2
| Composition (I) | C | Si | Mn | P | S | Alt | Als | Ca | Cr | Nb | B |
| Example 1 | 0.19 | 0.21 | 1.16 | 0.011 | 0.002 | 0.02 | 0.018 | 0.0011 | 0.66 | 0.015 | 0.0011 |
| Example 2 | 0.2 | 0.24 | 1.21 | 0.012 | 0.005 | 0.024 | 0.022 | 0.0019 | 0.71 | 0.021 | 0.0016 |
| Example 3 | 0.21 | 0.29 | 1.24 | 0.009 | 0.003 | 0.026 | 0.023 | 0.0024 | 0.75 | 0.024 | 0.0019 |
| Comparative example 1 | 0.196 | 0.23 | 1.21 | 0.011 | 0.003 | 0.023 | 0.02 | 0.0014 | 0.68 | 0.018 | 0.0013 |
| Comparative example 2 | 0.204 | 0.22 | 1.22 | 0.01 | 0.002 | 0.026 | 0.023 | 0.0017 | 0.71 | 0.021 | 0.0015 |
Table 3 shows the casting process parameters for the examples and comparative examples:
TABLE 3 casting Process parameters of examples 1-3 and comparative examples 1-2
The radian and the opening degree of the sector section are accurately adjusted before casting, and the errors are respectively not more than 0.3mm and 1.0 mm;
the water spraying condition of the spraying strips is checked, and the spraying strips are immediately replaced when being blocked;
the electromagnetic stirring adopts a double-roller type, and is arranged at the outlet of the 3 sections and the inlet of the 4 sections;
installing a ladle down nozzle argon blowing device, wherein the argon blowing device enables the periphery of the ladle down nozzle to keep argon atmosphere, oxygen and nitrogen in air are prevented from sucking molten steel, argon is blown between a tundish upper nozzle and an immersed nozzle, and the content of nitrogen elements is ensured not to exceed 50 ppm;
directly discharging the casting blank into a slow cooling pit after the casting blank is cut, wherein the slow cooling pit cannot be subjected to hot charging, a burner is arranged in the slow cooling pit, the burner is ignited before the casting blank is discharged, and the pit is fully covered with a rear cover;
the casting section is set to 2000X 250mm, and the pulling speed is stabilized at 0.9 m/min.
The difference between the comparative example 1 and the example is that the ladle is not provided with a down nozzle argon blowing device, protective casting measures are not taken, and the nitrogen content of molten steel reaches 68 ppm. The secondary cooling adopts strong cooling, and the specific water amount reaches 0.56L/kg steel.
Comparative example 2 differs from the examples in that the reduction amount under light pressure is less than 1.2mm/m and only 1.0 mm/m.
The surface quality and the center segregation of the cast slabs prepared in examples 1 to 3 and comparative examples 1 to 2 are shown in Table 4:
TABLE 4 surface quality and internal quality of slabs of examples and comparative examples
Therefore, when NM450 is produced, the casting machine optimizes the process casting parameters, so that the prepared casting blank has no surface cracks, the center segregation of the casting blank is obviously reduced, the low power rating is above the C system 1.0 level, the internal and external quality of the casting blank is obviously improved, and the guarantee is provided for the casting blank to be rolled into a steel plate with all qualified performances.
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 solutions 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 solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (5)
1. An NM450 casting blank production method is characterized by comprising the following steps:
1) the method for controlling the surface quality of the casting blank comprises the following steps:
1.1) protective casting is well done, oxygen absorption and nitrogen increase of molten steel are prevented, and the content of nitrogen element is ensured not to exceed 50 ppm;
installing a ladle down nozzle argon blowing device, wherein the argon blowing device enables the periphery of the ladle down nozzle to keep an argon atmosphere, and oxygen and nitrogen in air are prevented from being sucked into molten steel; argon is blown between the tundish upper nozzle and the submerged nozzle;
1.2) the secondary cooling water adopts weak cooling, and the specific water amount is 0.36-0.40L/kg steel;
1.3) the water quantity of a crystallizer is 4800L/min, and the water temperature is controlled to be 35-38 ℃;
1.4) accurately adjusting the accuracy of the roller of the sector section, wherein the radian is less than or equal to 0.3 mm.
2. The NM450 slab production method according to claim 1, further comprising:
2) the method for controlling the internal quality of the casting blank comprises the following steps:
2.1) adopting constant drawing speed and stabilizing at 0.9m/min, adopting tail end soft reduction under soft reduction, wherein the reduction amount reaches 1.2 mm/m;
2.2) electromagnetic stirring adopts a double-roller type, the double-roller type electromagnetic stirring device is arranged at an outlet of 3 sections and an inlet of 4 sections, and the current adopts the high current 380A and the frequency is 5 Hz;
2.3) ensuring the opening degree of the sector section, wherein the error is less than or equal to 1.0 mm;
2.4) directly discharging the casting blank into a slow cooling pit after the casting blank is cut, wherein hot charging is not required, a burner is arranged in the slow cooling pit, the burner is ignited before discharging, and the pit is filled with a rear cover; and after slowly cooling for 72 hours, the steel plate can be subjected to furnace rolling.
3. The NM450 casting blank production method according to claim 1, wherein in the 1.2), the water temperature is controlled to be 26-28 ℃.
4. The NM450 casting blank production method according to claim 1, wherein the NM450 wear-resistant steel comprises the following chemical components in percentage by mass: 0.19 to 0.21 percent of C, 0.2 to 0.3 percent of Si, 1.15 to 1.25 percent of Mn, less than or equal to 0.012 percent of P, less than or equal to 0.005 percent of S, 0.65 to 0.75 percent of Cr, 0.015 to 0.025 percent of Nb, 0.017 to 0.027 percent of Als, 0.0010 to 0.0025 percent of Ca, 0.001 to 0.002 percent of B, and the balance of Fe and inevitable impurities.
5. The NM450 slab production method according to claim 1, wherein the casting section of the NM450 wear resistant steel is 2000 x 250 mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012020316A (en) * | 2010-07-15 | 2012-02-02 | Jfe Steel Corp | Continuous casting method of wear resisting steel and wear resisting steel |
| CN102634728A (en) * | 2012-04-28 | 2012-08-15 | 首钢贵阳特殊钢有限责任公司 | Small square Billet continuous casting production technique of Fe-Mn-C high-manganese steel |
| CN103014543A (en) * | 2012-12-30 | 2013-04-03 | 南阳汉冶特钢有限公司 | Production process of wear-resistant steel NM400E medium plate |
| WO2019223209A1 (en) * | 2018-05-24 | 2019-11-28 | 南京钢铁股份有限公司 | 500 mpa-grade engineering machinery steel and manufacturing method therefor |
| CN110541108A (en) * | 2019-07-26 | 2019-12-06 | 马鞍山钢铁股份有限公司 | nb and V composite 700MPa grade high-strength anti-seismic steel bar steel and production method thereof |
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| CN113817957A (en) * | 2021-08-04 | 2021-12-21 | 敬业钢铁有限公司 | W-containing high-hardness corrosion-resistant high-carbon bearing steel and production process thereof |
-
2022
- 2022-02-14 CN CN202210134162.9A patent/CN114570897B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012020316A (en) * | 2010-07-15 | 2012-02-02 | Jfe Steel Corp | Continuous casting method of wear resisting steel and wear resisting steel |
| CN102634728A (en) * | 2012-04-28 | 2012-08-15 | 首钢贵阳特殊钢有限责任公司 | Small square Billet continuous casting production technique of Fe-Mn-C high-manganese steel |
| CN103014543A (en) * | 2012-12-30 | 2013-04-03 | 南阳汉冶特钢有限公司 | Production process of wear-resistant steel NM400E medium plate |
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| CN112725564A (en) * | 2020-11-17 | 2021-04-30 | 邯郸钢铁集团有限责任公司 | Production method of high-toughness nickel-containing gear steel for heavy-duty transmission |
| CN113664174A (en) * | 2021-07-02 | 2021-11-19 | 包头钢铁（集团）有限责任公司 | Production method of steel S355NL commodity blank for wind power flange |
| CN113817957A (en) * | 2021-08-04 | 2021-12-21 | 敬业钢铁有限公司 | W-containing high-hardness corrosion-resistant high-carbon bearing steel and production process thereof |
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