CN113579177A - Die cast steel pouring process - Google Patents
Die cast steel pouring process Download PDFInfo
- Publication number
- CN113579177A CN113579177A CN202110646747.4A CN202110646747A CN113579177A CN 113579177 A CN113579177 A CN 113579177A CN 202110646747 A CN202110646747 A CN 202110646747A CN 113579177 A CN113579177 A CN 113579177A
- Authority
- CN
- China
- Prior art keywords
- steel
- pouring
- riser
- ingot
- molten steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 40
- 229910001208 Crucible steel Inorganic materials 0.000 title claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 76
- 239000010959 steel Substances 0.000 claims abstract description 76
- 238000004512 die casting Methods 0.000 claims abstract description 8
- 238000004321 preservation Methods 0.000 claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 29
- 230000001502 supplementing effect Effects 0.000 claims description 6
- 235000007164 Oryza sativa Nutrition 0.000 claims description 3
- 238000003723 Smelting Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 235000009566 rice Nutrition 0.000 claims description 3
- 238000010583 slow cooling Methods 0.000 claims description 3
- 235000014347 soups Nutrition 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims 2
- 240000007594 Oryza sativa Species 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 8
- 238000010438 heat treatment Methods 0.000 abstract description 7
- 238000005242 forging Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 239000012535 impurity Substances 0.000 abstract description 2
- 230000000630 rising effect Effects 0.000 abstract 1
- 239000002893 slag Substances 0.000 description 8
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 241000209094 Oryza Species 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010309 melting process Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000003031 feeding effect Effects 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 239000010903 husk Substances 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 239000002436 steel type Substances 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
- B22D7/00—Casting ingots, e.g. from ferrous metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/06—Ingot moulds or their manufacture
- B22D7/10—Hot tops therefor
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a die casting steel pouring process, which can timely finely adjust the pouring speed according to the rising condition of the liquid level of an ingot die during pouring; the feeding time of the feeder head is reduced by about 10 percent compared with the prior art, the heat capacity value of the molten steel temperature of the feeder head is increased, and the secondary shrinkage cavity of the steel ingot and the removal of gas and impurities are favorably eliminated; and in the later feeding stage of the riser, the heating agent is not added, and the covering agent adding time is advanced by 1-2 minutes, so that the effect of heat preservation in advance is achieved, meanwhile, the production cost is reduced, and the environmental pollution caused by the heating agent is eliminated. In particular, the yield of die-cast steel is increased for the subsequent process (forging or forging). Mainly, the utilization rate of the riser can reach 20-30%. The utilization rate of the dead head of the original process for adding the heating agent is almost zero. Therefore, the invention of the pouring process has obvious economic benefit and social benefit.
Description
Technical Field
The invention relates to the field of die-cast steel ingots, in particular to a die-cast steel pouring process.
Background
In the traditional three-stage pouring process, under the condition that the steel type is the same as the ingot type, the ingot body pouring time and the riser feeding time are relatively fixed. And the feeding time of the riser is too long, so that the secondary oxidation of the molten steel is serious, and the inherent quality of the steel is influenced. Secondly, the longer the feeding time of the riser is, the faster the molten steel passing through a nozzle is cooled, so that the temperature and the heat capacity value of the molten steel of the riser are lower, the precipitation effect on gas and impurities is poorer, and the feeding effect on cast steel, the quality of the molten steel in the riser and the yield of forged steel are influenced to a certain extent.
No matter the traditional textbook or the current production process requirement, a certain amount of exothermic agent is required to be added in the later stage of steel ingot riser feeding in the production and pouring process of the die-cast steel. The dosage of the steel is 0.5 KG-1.0 KG per ton of steel. Aims to increase the temperature of riser molten steel, be beneficial to feeding an ingot body at the lower end of a riser and solve the problems of serious loosening and shrinkage of a steel ingot
The main components of the heat generating agent are: aluminum powder, ferrosilicon powder, fluorite, ferric oxide powder and the like. The heat generating agent is added into liquid high-temperature molten steel, and the melting process is an endothermic reaction (actually, a temperature reduction process). Only when the heating agent is fully melted, a large amount of heat can be released, the heat is absorbed in the melting process, and the heat generated in the heating (heat release) process can be accurately calculated through a formula. The heat absorption and the heat release are balanced, and the residual heat is the newly added heat.
However, the heat released is not completely generated in the vacuum vessel, and a considerable portion is dissipated in the atmosphere. That is, the released heat is not absorbed by the liquid molten steel in the riser, lost in the atmosphere, and causes environmental pollution. Therefore, it is considered that the effect of the exothermic agent added in this case on feeder locking is not as good as imaginable, and that there are also many adverse effects.
Therefore, a die casting steel pouring process which is capable of timely adjusting pouring time and riser locking time and does not adopt a heating agent is needed.
Disclosure of Invention
The invention mainly aims to provide a die casting steel pouring process which can timely adjust pouring time and riser locking time and does not adopt a heating agent.
The invention provides a die casting steel pouring process, which comprises the following process flows:
1) carrying out VD treatment on the molten steel obtained by smelting, and hoisting after final deoxidation;
2) molten steel is calmed;
3) pouring the ingot body, namely pouring molten steel into the ingot mould, and slowly reducing the pouring speed when the molten steel rises too fast;
4) feeding a riser;
5) adding a covering agent, and when the steel ingot riser is fed to about 95 percent of the steel ingot riser, adding the covering agent;
6) the trickle is used for supplementing, and the trickle is used for supplementing after the riser is supplemented, so that the soup channel and the middle injection pipe are filled;
7) and covering the steel ingot with a cover for slow cooling, and hanging a heat-preservation cover for covering the steel ingot.
Preferably, the superheat degree of the molten steel pouring process is controlled to be 46-50 ℃.
Preferably, the insulated risers must be dry, with a baking temperature of around 80 ℃ before use.
Preferably, the covering agent is carbonised rice husk.
The beneficial effects of the die casting steel pouring process of the invention are as follows:
1. the pouring speed is invariable all the time when the traditional molten steel is poured, but in the actual pouring process, the situation that the liquid molten steel is easy to go out of the steel ingot mould and rise too fast is mostly shown as follows: firstly, the covering slag is diluted and melted, secondly, the liquid molten steel and the covering slag are convex at the center of the steel die, and the rolling phenomenon is generated when the liquid molten steel and the covering slag are serious, and thirdly, the color of the molten steel is bright and dazzling. By reducing the pouring speed slowly in time, the defects of slag rolling of molten steel, secondary oxidation of the molten steel, increase of gas content and gas inclusion, center looseness, inclusion aggregation and the like can be avoided.
2. The exothermic agent is not added in the riser feeding process, so that the pollution to the environment after the exothermic agent is added can be reduced and eliminated, the cost increased by the addition of the exothermic agent is reduced, the steel ingot yield in the subsequent process (forging or forging) is improved, the riser utilization rate can reach 20% -30%, the riser utilization rate is almost zero in the original process of adding the exothermic agent, the addition time of the covering agent is advanced by 1-2 minutes because the exothermic agent is not added in the riser, and the effect of advanced heat preservation is achieved.
3. By adding the covering agent in advance, the whole process time can be shortened, so that the effect of heat preservation in advance is achieved, the whole process time of riser feeding is shortened, secondary oxidation of molten steel is reduced, and the internal quality of steel ingots is guaranteed.
Drawings
FIG. 1 is a process flow diagram of the cast steel pouring process of the present invention;
the implementation, functional features and advantages of the objects of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, an embodiment of the cast steel pouring process of the present invention is provided:
a die casting steel pouring process is characterized by comprising the following process flows:
1) carrying out VD treatment on the molten steel obtained by smelting, and hoisting after final deoxidation;
2) molten steel is calmed;
3) pouring an ingot body, namely pouring molten steel into the ingot mould, slowly reducing the pouring speed when the molten steel rises too fast, and controlling the superheat degree of the molten steel pouring process to be 46-50 ℃;
4) feeding risers, drying the insulated risers, and baking at about 80 ℃ before use;
5) adding a covering agent, wherein when the steel ingot feeder head is fed to about 95 percent of the steel ingot feeder head, the covering agent is carbonized rice hulls;
6) the trickle is used for supplementing, and the trickle is used for supplementing after the riser is supplemented, so that the soup channel and the middle injection pipe are filled;
7) and covering the steel ingot with a cover for slow cooling, and hanging a heat-preservation cover for covering the steel ingot.
The beneficial effects of the die casting steel pouring process of the invention are as follows:
1. the pouring speed is invariable all the time when the traditional molten steel is poured, but in the actual pouring process, the situation that the liquid molten steel is easy to go out of the steel ingot mould and rise too fast is mostly shown as follows: firstly, the covering slag is diluted and melted, secondly, the liquid molten steel and the covering slag are convex at the center of the steel die, and the rolling phenomenon is generated when the liquid molten steel and the covering slag are serious, and thirdly, the color of the molten steel is bright and dazzling. By reducing the pouring speed slowly in time, the defects of slag rolling of molten steel, secondary oxidation of the molten steel, increase of gas content and gas inclusion, center looseness, inclusion aggregation and the like can be avoided.
2. The exothermic agent is not added in the riser feeding process, so that the pollution to the environment after the exothermic agent is added can be reduced and eliminated, the cost increased by the addition of the exothermic agent is reduced, the steel ingot yield in the subsequent process (forging or forging) is improved, the riser utilization rate can reach 20% -30%, the riser utilization rate is almost zero in the original process of adding the exothermic agent, the addition time of the covering agent is advanced by 1-2 minutes because the exothermic agent is not added in the riser, and the effect of advanced heat preservation is achieved.
3. By adding the covering agent in advance, the whole process time can be shortened, so that the effect of heat preservation in advance is achieved, the whole process time of riser feeding is shortened, secondary oxidation of molten steel is reduced, and the internal quality of steel ingots is guaranteed.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, are included in the scope of the present invention.
Claims (4)
1. A die casting steel pouring process is characterized by comprising the following process flows:
1) carrying out VD treatment on the molten steel obtained by smelting, and hoisting after final deoxidation;
2) molten steel is calmed;
3) pouring the ingot body, namely pouring molten steel into the ingot mould, and slowly reducing the pouring speed when the molten steel rises too fast;
4) feeding a riser;
5) adding a covering agent, and when the steel ingot riser is fed to about 95 percent of the steel ingot riser, adding the covering agent;
6) the trickle is used for supplementing, and the trickle is used for supplementing after the riser is supplemented, so that the soup channel and the middle injection pipe are filled;
7) and covering the steel ingot with a cover for slow cooling, and hanging a heat-preservation cover for covering the steel ingot.
2. The mold-cast steel pouring process as claimed in claim 1, wherein the superheat degree of the molten steel pouring process is controlled to be 46-50 ℃.
3. The process of mold-casting steel according to claim 1, wherein the insulated risers must be dry and the baking temperature before use is around 80 ℃.
4. The molded steel casting process of claim 1, wherein said covering agent is carbonized rice hulls.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110646747.4A CN113579177A (en) | 2021-06-10 | 2021-06-10 | Die cast steel pouring process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110646747.4A CN113579177A (en) | 2021-06-10 | 2021-06-10 | Die cast steel pouring process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113579177A true CN113579177A (en) | 2021-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110646747.4A Pending CN113579177A (en) | 2021-06-10 | 2021-06-10 | Die cast steel pouring process |
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| Country | Link |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102886501A (en) * | 2012-10-09 | 2013-01-23 | 中国科学院金属研究所 | Tooling for efficiently manufacturing wide thick plate blank for wide thick plate rolling machine and manufacture method thereof |
| CN104070145A (en) * | 2014-06-19 | 2014-10-01 | 中国科学院金属研究所 | Manufacturing tooling and efficient production method of large height-diameter ratio circular casting billet |
| CN206662200U (en) * | 2017-01-24 | 2017-11-24 | 济南圣泉集团股份有限公司 | Rising head |
| CN112355254A (en) * | 2020-10-27 | 2021-02-12 | 上海电气上重铸锻有限公司 | Manufacturing method of ultralow-nitrogen bottom pouring steel ingot |
| CN112813227A (en) * | 2020-12-22 | 2021-05-18 | 中钢集团邢台机械轧辊有限公司 | Method for removing dust by using electric furnace |
-
2021
- 2021-06-10 CN CN202110646747.4A patent/CN113579177A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102886501A (en) * | 2012-10-09 | 2013-01-23 | 中国科学院金属研究所 | Tooling for efficiently manufacturing wide thick plate blank for wide thick plate rolling machine and manufacture method thereof |
| CN104070145A (en) * | 2014-06-19 | 2014-10-01 | 中国科学院金属研究所 | Manufacturing tooling and efficient production method of large height-diameter ratio circular casting billet |
| CN206662200U (en) * | 2017-01-24 | 2017-11-24 | 济南圣泉集团股份有限公司 | Rising head |
| CN112355254A (en) * | 2020-10-27 | 2021-02-12 | 上海电气上重铸锻有限公司 | Manufacturing method of ultralow-nitrogen bottom pouring steel ingot |
| CN112813227A (en) * | 2020-12-22 | 2021-05-18 | 中钢集团邢台机械轧辊有限公司 | Method for removing dust by using electric furnace |
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Application publication date: 20211102 |