CN114570897B - NM450 casting blank production method - Google Patents
NM450 casting blank production method Download PDFInfo
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- CN114570897B CN114570897B CN202210134162.9A CN202210134162A CN114570897B CN 114570897 B CN114570897 B CN 114570897B CN 202210134162 A CN202210134162 A CN 202210134162A CN 114570897 B CN114570897 B CN 114570897B
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- 238000005266 casting Methods 0.000 title claims abstract description 64
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 34
- 239000010959 steel Substances 0.000 claims abstract description 34
- 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 15
- 229910052786 argon Inorganic materials 0.000 claims abstract description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 12
- 238000007664 blowing Methods 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 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
- 238000003908 quality control method Methods 0.000 claims abstract description 5
- 239000012300 argon atmosphere Substances 0.000 claims abstract description 4
- 239000000498 cooling water Substances 0.000 claims abstract description 3
- 238000005096 rolling process Methods 0.000 claims description 8
- 238000010583 slow cooling Methods 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 3
- 229910052758 niobium Inorganic materials 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 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
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 238000005204 segregation Methods 0.000 abstract description 6
- 238000009749 continuous casting Methods 0.000 abstract description 4
- 230000001276 controlling effect Effects 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 12
- 238000000034 method Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000008901 benefit Effects 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
- 239000000203 mixture Substances 0.000 description 2
- 239000007921 spray 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
- 230000000903 blocking effect Effects 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
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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
- B22D11/12—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 surface quality control method of the casting blank comprises the following steps: 1.1 Protection casting is carried out, molten steel is prevented from absorbing oxygen and increasing nitrogen, and the content of nitrogen elements is ensured not to exceed 50ppm; installing an argon blowing device at the ladle drain opening, wherein the argon blowing device enables the periphery of the ladle drain opening to be kept in argon atmosphere, and oxygen and nitrogen in air are prevented from being absorbed into molten steel; argon is blown between the tundish upper nozzle and the immersed nozzle; 1.2 The secondary cooling water quantity adopts weak cooling, and the specific water quantity is 0.36-0.40L/kg of steel; 1.3 4800L/min of crystallizer water, and controlling the water temperature at 35-38 ℃;1.4 The roller precision of the sector section is accurately regulated, and the radian is less than or equal to 0.3mm. According to the invention, through optimizing casting parameters of a casting 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 continuous casting blank is more than the C-series 1.0 level 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 NM450 casting blank production method.
Background
NM450 is a novel wear-resistant steel, and compared with traditional wear-resistant metal materials such as spheroidal graphite cast iron, high manganese steel and the like, the wear-resistant steel has good toughness and wear resistance, can bear moderate-strength impact wear, is widely applied to the fields of mining machinery, hydraulic equipment, rail transit, national defense and military industry and the like along with the rapid development of heavy industry in China, has increased market demand and has better economic and social benefits. However, the abrasion-resistant steel is difficult to produce, not only is the comprehensive mechanical properties such as hardness and abrasion resistance difficult to ensure, 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 is fundamentally solved, and the center segregation of a casting blank is improved from casting. Because the steel contains Nb, ti and other alloys, surface cracks are easy to occur on the surface of a casting blank, and the surface of the steel plate is cracked after being rolled into the steel plate, so that the steel plate cannot be used. The root cause of the above defects in the steel sheet is caused by the quality defects of the cast slab used for rolling the steel sheet, so casting a cast slab excellent in the inner and outer quality by a casting machine is a precondition for solving the above defects in the steel sheet.
The China patent with the application number 201710204563.6 discloses a method for producing thin wear-resistant steel 450 by a hot continuous rolling ultra-fast cooling process, and the method controls microstructure by ultra-fast cooling quenching after rolling through reasonable alloying design, fully plays the role of strengthening the performance of the alloy, improves the strength and toughness ratio of the steel and reduces the production cost. However, this document does not describe in detail how a slab having excellent internal and external quality is cast by a casting machine, and the quality of a cast slab is difficult to be ensured by the method described in the document.
The Chinese patent with the application number 201610642720.7 discloses a Brinell hardness 450-level wear-resistant steel and a manufacturing method thereof, and the method mainly adopts component design and a heat treatment process to ensure that the wear-resistant steel has good uniformity of residual stress and good wear resistance, and does not crack or deform in the use process, thereby prolonging the service life of the wear-resistant steel. However, there is no description on how to improve the internal and external quality of a cast slab from the casting point of view of a casting machine, and to produce a cast slab excellent in quality so as to satisfy various properties after rolling into a steel sheet.
Disclosure of Invention
The invention aims to provide a 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 casting process casting parameters, and the low-power rating of the continuous casting blank according to YB/T4003-1997 is over 1.0 level.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention discloses a NM450 casting blank production method, which comprises the following steps:
1) The surface quality control method of the casting blank comprises the following steps:
1.1 Protection casting is carried out, molten steel is prevented from absorbing oxygen and increasing nitrogen, and the content of nitrogen elements is ensured not to exceed 50ppm;
installing an argon blowing device at the ladle drain opening, wherein the argon blowing device enables the periphery of the ladle drain opening to be kept in argon atmosphere, and oxygen and nitrogen in air are prevented from being absorbed into molten steel; argon is blown between the tundish upper nozzle and the immersed nozzle;
1.2 The secondary cooling water quantity adopts weak cooling, and the specific water quantity is 0.36-0.40L/kg of steel;
The water content of each specific zone is shown in Table 1:
Table 1 amount of water in each zone of the secondary cooling during NM450 casting
1.3 4800L/min of crystallizer water, and controlling the water temperature at 35-38 ℃;
1.4 The roller precision of the sector section is accurately regulated, and the radian is less than or equal to 0.3mm.
Further, the method further comprises the following steps:
2) The internal quality control method of the casting blank comprises the following steps:
2.1 Constant pulling speed is adopted and is stabilized at 0.9m/min, and the light pressing adopts the light pressing at the tail end, so that the pressing amount reaches 1.2mm/m;
2.2 The electromagnetic stirring adopts a double roller type, is arranged at a 3-section outlet and a 4-section inlet, and adopts a large current 380A and the frequency is 5Hz;
2.3 Ensuring the opening degree of the sector section, wherein the error is less than or equal to 1.0mm;
2.4 Directly taking off the casting blank into a slow cooling pit after cutting, and not hot charging, wherein a burner is arranged in the slow cooling pit, the burner is ignited before taking off, and a rear cover is fully arranged in the pit; and (5) after slow cooling for 72 hours, charging and rolling.
Further, in the 1.2), the water temperature is controlled to be 26-28 ℃.
Further, the chemical components and the mass percentages of the NM450 wear-resistant steel are ：C:0.19％～0.21％,Si:0.2％～0.3％,Mn:1.15％～1.25％,P:≤0.012％,S:≤0.005％,Cr:0.65％～0.75％,Nb:0.015％～0.025％,Als:0.017％～0.027％,Ca:0.0010％～0.0025％,B:0.001％～0.002％, as follows, and the balance is Fe and unavoidable impurities.
Further, the casting section of the NM450 wear-resistant steel is 2000×250mm.
Compared with the prior art, the invention has the beneficial technical effects that:
When NM450 is cast by a 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 according to YB/T4003-1997 is above C series 1.0 level, meanwhile, the internal and external quality of the casting blank is obviously improved, and the method provides guarantee for the steel plate with excellent subsequent rolling performance, no delayed crack and good surface quality.
Drawings
The invention is further described with reference to the following description of the drawings.
FIG. 1 shows the effect of casting billet in example 1 of the present invention.
Fig. 2 shows the effect of casting billet in example 2 of the present invention.
Fig. 3 shows the effect of casting billet in example 3 of the present invention.
Fig. 4 shows the effect of the casting slab of comparative example 1 at a low power.
Fig. 5 shows the effect of the casting slab of comparative example 2 at a low power.
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 clearly and completely described below in connection with the embodiments.
Table 2 shows the chemical compositions of examples and comparative examples:
TABLE 2 chemical Components (in mass%) of examples 1 to 3 and comparative examples 1 to 2
| Composition of the components | 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 casting process parameters of examples and comparative examples:
table 3 casting process parameters for examples 1 to 3 and comparative examples 1 to 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 1.0mm;
Checking the water spraying condition of the spray bars, and immediately replacing the spray bars with blocking phenomenon;
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 an argon blowing device at the ladle lower nozzle, wherein the argon blowing device keeps argon atmosphere around the ladle lower nozzle, so that oxygen and nitrogen in air are prevented from being absorbed into molten steel, argon is blown between the tundish upper nozzle and the immersed nozzle, and the nitrogen element content is ensured not to exceed 50ppm;
After the casting blank is cut, directly taking off the casting blank into a slow cooling pit, and not hot charging, wherein a burner is arranged in the slow cooling pit, igniting the burner before taking off the casting blank, and fully filling a rear cover in the pit;
the casting section was set at 2000X 250mm and the pull rate was stabilized at 0.9m/min.
Comparative example 1 differs from the example in that the ladle is not provided with a lower nozzle argon blowing device, no protection casting measures are taken, and the nitrogen content of molten steel reaches 68ppm. The secondary cooling adopts strong cooling, and the specific water quantity reaches 0.56L/kg of steel.
Comparative example 2 differs from the example in that the soft reduction is less than 1.2mm/m, but only 1.0mm/m.
The surface quality and center segregation of the cast slabs obtained in examples 1 to 3 and comparative examples 1 to 2 are shown in Table 4:
TABLE 4 surface quality and internal quality of casting blanks of examples and comparative examples
Therefore, when NM450 is produced, the casting machine optimizes the process casting parameters, so that the manufactured casting blank has no surface cracks, the center segregation of the casting blank is obviously reduced, the low-power rating is more than C series 1.0 grade, the internal and external quality of the casting blank is obviously improved, and the guarantee is provided for rolling the casting blank into steel plates with all qualified performances.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (4)
1. A method for producing NM450 cast slab, comprising:
1) The surface quality control method of the casting blank comprises the following steps:
1.1 Protection casting is carried out, molten steel is prevented from absorbing oxygen and increasing nitrogen, and the content of nitrogen elements is ensured not to exceed 50ppm;
installing an argon blowing device at the ladle drain opening, wherein the argon blowing device enables the periphery of the ladle drain opening to be kept in argon atmosphere, and oxygen and nitrogen in air are prevented from being absorbed into molten steel; argon is blown between the tundish upper nozzle and the immersed nozzle;
1.2 The secondary cooling water quantity adopts weak cooling, and the specific water quantity is 0.36-0.40L/kg of steel;
1.3 4800L/min of crystallizer water, and controlling the water temperature to be 35-38 ℃;
1.4 Precisely adjusting the roller precision of the sector section, wherein the radian is less than or equal to 0.3mm;
2) The internal quality control method of the casting blank comprises the following steps:
2.1 Constant pulling speed is adopted and is stabilized at 0.9m/min, and the light pressing adopts the light pressing at the tail end, so that the pressing amount reaches 1.2mm/m;
2.2 The electromagnetic stirring adopts a double roller type, is arranged at a 3-section outlet and a 4-section inlet, and adopts a large current 380A and the frequency is 5Hz;
2.3 Ensuring the opening degree of the sector section, wherein the error is less than or equal to 1.0mm;
2.4 Directly taking off the casting blank into a slow cooling pit after cutting, and not hot charging, wherein a burner is arranged in the slow cooling pit, the burner is ignited before taking off, and a rear cover is fully arranged in the pit; and (5) after slow cooling for 72 hours, charging and rolling.
2. The NM450 casting blank production method according to claim 1, wherein in 1.2), the water temperature is controlled to be 26-28 ℃.
3. The NM450 casting blank production method according to claim 1, wherein the NM450 casting blank comprises the following chemical components in percentage by mass:
C:0.19%~0.21%,Si:0.2%~0.3%,Mn:1.15%~1.25%,P:≤0.012%,S:≤0.005%,Cr:0.65%~0.75%,Nb:0.015%~0.025%,Als:0.017%~0.027%,
0.0010 to 0.0025 percent of Ca, 0.001 to 0.002 percent of B, and the balance of Fe and unavoidable impurities.
4. The NM450 casting blank production method according to claim 1, wherein the NM450 casting blank has a casting section of 2000 x 250mm.
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| CN202210134162.9A CN114570897B (en) | 2022-02-14 | 2022-02-14 | NM450 casting blank production method |
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| CN114570897B true CN114570897B (en) | 2024-06-11 |
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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 |
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| 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 |
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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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