CN111974980A - Alloy preheating process for smelting high alloy steel in converter steelmaking process - Google Patents
Alloy preheating process for smelting high alloy steel in converter steelmaking process Download PDFInfo
- Publication number
- CN111974980A CN111974980A CN202010708366.XA CN202010708366A CN111974980A CN 111974980 A CN111974980 A CN 111974980A CN 202010708366 A CN202010708366 A CN 202010708366A CN 111974980 A CN111974980 A CN 111974980A
- Authority
- CN
- China
- Prior art keywords
- alloy
- preheating
- ladle
- steel
- converter steelmaking
- 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
Images
Classifications
-
- 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
- B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
- B22D41/01—Heating means
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
Abstract
The invention discloses an alloy preheating process for smelting high alloy steel in a converter steelmaking process, which relates to the technical field of converter steelmaking and comprises the steps of preheating steel ladle preparation → preheating steel ladle protection → first alloy addition → first alloy baking and preheating → second alloy addition → second alloy baking and preheating → alloying steel ladle preparation → preheating alloy rotary ladle, wherein when alloy materials are added, half of the total amount of the alloy is added in each batch, and the alloy materials are added according to the sequence of the melting point of the alloy from low to high. The refining alloying time can be shortened by more than 70 percent, the influences of low production efficiency and unstable molten steel quality caused by long-time temperature rise of the refining furnace for alloying are greatly reduced, continuous production can be ensured, and the product quality is improved.
Description
Technical Field
The invention relates to the technical field of converter steelmaking, in particular to an alloy preheating process for smelting high alloy steel in a converter steelmaking process.
Background
The converter continuous casting steelmaking process belongs to a high-efficiency high-quality large-scale production process, but the problem of alloying is always a difficult problem for special steel grades with high content (the total content of the alloy accounts for more than 10%) of easily-oxidized alloy (such as Mn, Cr and the like). Because the whole process of converter smelting is a strong oxidation process, easily-oxidized alloy elements such as Mn, Cr and the like can not be added in the converter, but can only be added between the steel tapping and the refining furnace for alloying, so that the alloying time is long, and the alloy contents of steel grades are different. The alloying time is generally 6-12 hours, and the refining furnace can be alloyed for a long time, so that the recarburization of the electrode on the molten steel, the hydrogenation and the nitrogen on the molten steel and excessive slag steel reaction are caused, and the purity of the molten steel is seriously influenced; meanwhile, the continuous production of continuous casting cannot be ensured by long-time refining treatment, and the production efficiency is low.
Disclosure of Invention
In order to solve the technical problem, the invention provides an alloy preheating process for smelting high alloy steel in the converter steelmaking process, which comprises the steps of preheating steel ladle preparation → preheating steel ladle protection → first alloy addition → first alloy baking and preheating → second alloy addition → second alloy baking and preheating → alloying steel ladle preparation → preheating alloy rotary ladle, wherein when alloy materials are added, half of the total amount of the alloy is added in each batch, and the alloy materials are added according to the sequence of the melting point of the alloy from low to high.
The technical effects are as follows: the invention fully utilizes the existing resources of the steel plant, and shortens the alloying time of the refining furnace after the steel tapping of the converter by controlling the processes of the selection of the preheating steel ladle, the addition mode of the preheating alloy, the preheating time, the preheating batch, the baking temperature, the protection of the alloying steel ladle and the like. Compared with the normal refining alloying process, the new process can shorten the refining alloying time by more than 70 percent, greatly reduces the influence of low production efficiency and unstable molten steel quality caused by long-time temperature rise of the refining furnace to alloy, can ensure continuous production, and also improves the product quality.
The technical scheme of the invention is further defined as follows:
the alloy preheating process for smelting high alloy steel in the converter steelmaking process comprises the following steps: and using the ladle in the furnace 10 before the ladle is offline as a preheating ladle.
The alloy preheating process for smelting high alloy steel in the converter steelmaking process comprises the following steps: lime for steel making is added to the bottom of the steel ladle as a cushion bottom material, and the adding amount is 10 kg/t.
The alloy preheating process for smelting high alloy steel in the converter steelmaking process comprises the following steps of: after the first batch of alloy is added, the temperature of the ladle roaster is adjusted to 1000 ℃, and the roasting time is more than 24 hours.
The alloy preheating process for smelting high alloy steel in the converter steelmaking process comprises the following steps of: and adding a second batch of alloy after the baking time of the first batch of alloy reaches 24 hours.
The alloy preheating process for smelting high alloy steel in the converter steelmaking process comprises the following steps of: after the second batch of alloy is added, the temperature of the ladle roaster is adjusted to 850 ℃, and the ladle roaster is continuously roasted for more than 24 hours.
In the alloy preheating process for smelting the high alloy steel in the converter steelmaking process, the total time of the two alloy baking and preheating processes is controlled to be 48 to 52 hours.
The alloy preheating process for smelting the high alloy steel in the converter steelmaking process comprises the following steps: and after the alloy preheating time meets the requirement, selecting a normally circulated steel ladle as an alloying steel ladle according to field production.
The alloy preheating process for smelting high alloy steel in the converter steelmaking process comprises the following steps: and transferring the preheated alloy into a normal transfer ladle with a ladle bottom protection device, and carrying out alloying tapping operation.
The smelting of the high alloy steel in the converter steelmaking processThe alloy preheating process adopts a round ladle bottom protection device formed by cutting and welding a grating plate or a steel bar, the size of the round ladle bottom protection device is the same as the diameter of a ladle bottom, a round hole is formed, and the aperture is less than or equal to 50mm2(ii) a Before reverse alloying, the ladle bottom protection device is hung into the bottom of the ladle, and then the ladle with the ladle bottom protection device is hung to the tapping position.
The invention has the beneficial effects that:
(1) before the alloy is added, lime is added to the bottom of the steel ladle as a cushion pad base material, so that the impact damage of the added alloy to the bottom of the steel ladle is prevented, the moisture of a slagging material is reduced, and the quality of molten steel is improved;
(2) in the invention, the alloy is baked in two batches, and half of the total amount is added each time, so that the alloy is completely baked;
(3) the invention manufactures the ladle bottom protection device in advance to protect the alloying ladle drainage sand and the ladle bottom blowing system.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The alloy preheating process for smelting high alloy steel in the converter steelmaking process provided by the embodiment selects a 150t converter and a 150t LF refining furnace to smelt high alloy steel (the Mn content in steel is required to be 20% -23%, and the Cr alloy is required to be 3.5% -4.5%), 32 t of metal manganese and 10 t of micro-carbon ferrochrome are required to be added according to the component requirements of steel,
as shown in fig. 1, the specific alloy preheating process is controlled as follows:
preheating a steel ladle: the total ladle age of the ladles is 120 furnaces, and a No. 6 ladle with the ladle age of 116 furnaces is selected as an alloy preheating ladle;
preheating a steel ladle for protection: hoisting the preheated alloy steel ladle to a cold repair station, adding 1.5 tons of steelmaking lime to the bottom of No. 6 steel ladle, and uniformly spreading the steelmaking lime on the bottom of the steel ladle;
adding a first batch of alloy: according to the conditions of the melting point of the alloy, micro-carbon ferrochrome and metal manganese are adopted, the melting point of chromium is 1857 ℃, the melting point of manganese is 1244 ℃, the melting point of the micro-carbon ferrochrome is higher than that of the metal manganese, in order to prevent baking flame from sintering the alloy, the alloy is added in the sequence of the melting points from low to high, 16 tons of the metal manganese are added into a No. 6 steel ladle, and 5 tons of the micro-carbon ferrochrome are added;
baking and preheating a first batch of alloy: hoisting the No. 6 steel ladle added with the first batch of alloy to a steel ladle baking station (a normal steel ladle baking station) for preheating, adjusting the flame temperature to 1000 ℃, and baking for 24 hours;
second batch alloy addition: after the preheating time of the first batch of alloy meets the requirement, hoisting the No. 6 steel ladle to a cold repair station, adding the alloy according to the sequence of melting points from low to high, and adding 16 tons of manganese metal and 5 tons of micro-carbon ferrochrome into the No. 6 steel ladle again;
baking and preheating the second batch of alloy: after the second batch of alloy is added, the second batch of alloy is lifted to a ladle baking station to be continuously preheated and baked, the temperature of a ladle baking device is adjusted to 850 ℃, and the second batch of alloy is baked for 24 hours;
preheating an alloy ladle: hoisting a normal turnover No. 30 steel ladle provided with a steel ladle bottom protection device to a tapping position, transferring preheated alloy of the No. 6 steel ladle into the normal turnover No. 30 steel ladle provided with the steel ladle bottom protection device, and after preheating the alloy to the No. 30 steel ladle, controlling the alloy temperature to be 634 and 651 ℃;
and (4) carrying out steel tapping alloying operation, wherein the total time from steel tapping alloying to refining furnace alloying is 133 minutes.
In order to protect the alloying ladle drainage sand and a ladle bottom blowing system, a ladle bottom protection device is manufactured in advance, a grid plate or a steel bar is adopted to be cut and welded into a round shape, the size of the round shape is the same as the diameter of the ladle bottom, the round hole is formed, and the aperture is less than or equal to 50mm2. Before reverse alloying, the ladle bottom protection device is hung into the bottom of the ladle, and then the ladle with the ladle bottom protection device is hung to the tapping position.
The process greatly shortens the refining alloying time, reduces the influence of low production efficiency and unstable molten steel quality caused by long-time temperature rise of the refining furnace for alloying, ensures continuous production and improves the product quality.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (10)
1. An alloy preheating process for smelting high alloy steel in a converter steelmaking process is characterized by comprising the following steps: the method comprises the steps of preheating steel ladle preparation → preheating steel ladle protection → first alloy addition → first alloy baking and preheating → second alloy addition → second alloy baking and preheating → alloying steel ladle preparation → preheating alloy ladle transfer, wherein when the alloy materials are added, half of the total amount of the alloy is added in each batch, and the alloy materials are added in the sequence from low to high in melting point.
2. The alloy preheating process for smelting high alloy steel in the converter steelmaking process according to claim 1, which is characterized in that: preheating a steel ladle: and using the ladle in the furnace 10 before the ladle is offline as a preheating ladle.
3. The alloy preheating process for smelting high alloy steel in the converter steelmaking process according to claim 1, which is characterized in that: preheating a steel ladle for protection: lime for steel making is added to the bottom of the steel ladle as a cushion bottom material, and the adding amount is 10 kg/t.
4. The alloy preheating process for smelting high alloy steel in the converter steelmaking process according to claim 1, which is characterized in that: baking and preheating a first batch of alloy: after the first batch of alloy is added, the temperature of the ladle roaster is adjusted to 1000 ℃, and the roasting time is more than 24 hours.
5. The alloy preheating process for smelting high alloy steel in the converter steelmaking process according to claim 4, which is characterized in that: second batch alloy addition: and adding a second batch of alloy after the baking time of the first batch of alloy reaches 24 hours.
6. The alloy preheating process for smelting high alloy steel in the converter steelmaking process according to claim 4, which is characterized in that: baking and preheating the second batch of alloy: after the second batch of alloy is added, the temperature of the ladle roaster is adjusted to 850 ℃, and the ladle roaster is continuously roasted for more than 24 hours.
7. The alloy preheating process for smelting high alloy steel in the converter steelmaking process according to claim 6, which is characterized in that: the total time of the two alloy baking preheating is controlled between 48 and 52 hours.
8. The alloy preheating process for smelting high alloy steel in the converter steelmaking process according to claim 1, which is characterized in that: preparing an alloying steel ladle: and after the alloy preheating time meets the requirement, selecting a normally circulated steel ladle as an alloying steel ladle according to field production.
9. The alloy preheating process for smelting high alloy steel in the converter steelmaking process according to claim 1, which is characterized in that: preheating an alloy ladle: and transferring the preheated alloy into a normal transfer ladle with a ladle bottom protection device, and carrying out alloying tapping operation.
10. The alloy preheating process for smelting high alloy steel in the converter steelmaking process according to claim 9, wherein the alloy preheating process comprises the following steps: the round ladle bottom protection device is formed by cutting and welding a grating plate or a steel bar, has the same size as the diameter of the ladle bottom and is provided with a round hole, and the aperture is less than or equal to 50mm2(ii) a Before reverse alloying, the ladle bottom protection device is hung into the bottom of the ladle, and then the ladle with the ladle bottom protection device is hung to the tapping position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010708366.XA CN111974980A (en) | 2020-07-22 | 2020-07-22 | Alloy preheating process for smelting high alloy steel in converter steelmaking process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010708366.XA CN111974980A (en) | 2020-07-22 | 2020-07-22 | Alloy preheating process for smelting high alloy steel in converter steelmaking process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111974980A true CN111974980A (en) | 2020-11-24 |
Family
ID=73439558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010708366.XA Pending CN111974980A (en) | 2020-07-22 | 2020-07-22 | Alloy preheating process for smelting high alloy steel in converter steelmaking process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111974980A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115094196A (en) * | 2022-06-24 | 2022-09-23 | 包头钢铁（集团）有限责任公司 | High alloy steel alloy adding control method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104195289A (en) * | 2014-08-13 | 2014-12-10 | 中原特钢股份有限公司 | Alloying process for adjusting nickel content in steel |
| CN106591536A (en) * | 2016-12-20 | 2017-04-26 | 中天钢铁集团有限公司 | Production process for high-purity bearing steel |
| CN106636857A (en) * | 2016-09-29 | 2017-05-10 | 成都真火科技有限公司 | Alloy steel smelting method |
| CN109207837A (en) * | 2018-09-25 | 2019-01-15 | 山西通才工贸有限公司 | A method of producing SWRH82B wire rod |
| CN111394644A (en) * | 2020-04-24 | 2020-07-10 | 南京钢铁股份有限公司 | Rapid alloying process for high-manganese austenitic steel used at low temperature |
-
2020
- 2020-07-22 CN CN202010708366.XA patent/CN111974980A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104195289A (en) * | 2014-08-13 | 2014-12-10 | 中原特钢股份有限公司 | Alloying process for adjusting nickel content in steel |
| CN106636857A (en) * | 2016-09-29 | 2017-05-10 | 成都真火科技有限公司 | Alloy steel smelting method |
| CN106591536A (en) * | 2016-12-20 | 2017-04-26 | 中天钢铁集团有限公司 | Production process for high-purity bearing steel |
| CN109207837A (en) * | 2018-09-25 | 2019-01-15 | 山西通才工贸有限公司 | A method of producing SWRH82B wire rod |
| CN111394644A (en) * | 2020-04-24 | 2020-07-10 | 南京钢铁股份有限公司 | Rapid alloying process for high-manganese austenitic steel used at low temperature |
Non-Patent Citations (1)
| Title |
|---|
| 王文礼等: "《有色金属及合金的熔炼与铸锭》", 31 August 2009 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115094196A (en) * | 2022-06-24 | 2022-09-23 | 包头钢铁（集团）有限责任公司 | High alloy steel alloy adding control method |
| CN115094196B (en) * | 2022-06-24 | 2023-08-08 | 包头钢铁（集团）有限责任公司 | High alloy steel alloy addition control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111876649B (en) | Smelting process of high-niobium high-temperature alloy large-size ingot and high-niobium high-temperature alloy large-size ingot | |
| CN111876651B (en) | Large-size high-niobium high-temperature 706 alloy ingot and smelting process thereof | |
| CN106947908B (en) | A kind of method of continuous casting electroslag production 4Cr5MoSiV1 die steels | |
| JP7359972B2 (en) | How to produce nickel-based steel from high phosphorus molten iron | |
| AU2020443584B2 (en) | Low-temperature high-manganese austenitic steel rapid alloying process | |
| CN108866444B (en) | Corrosion-resistant mirror surface die steel and preparation method thereof | |
| CN103966515B (en) | A kind of method utilizing electric arc furnace to prepare low-alloy high-strength toughness cast steel adding | |
| CN110438413B (en) | Production process of vanadium-containing steel bar | |
| CN103627839B (en) | Semisteel steelmaking carbon content control method and semisteel steelmaking method | |
| CN114058952B (en) | High-strength antioxidant CNRE rare earth heat-resistant steel for grate plate of grate and preparation method thereof | |
| CN105132621A (en) | Smelting process for steel for low-silicon aluminum steel-free welding wire | |
| CN111974980A (en) | Alloy preheating process for smelting high alloy steel in converter steelmaking process | |
| CN113278834B (en) | VIM furnace smelting method of ultrahigh N content high-temperature alloy | |
| CN107916319B (en) | Refining method of LF furnace in container steel production of CSP production line | |
| CN109825769A (en) | One kind steel of stainless steel electrode containing molybdenum and preparation method thereof | |
| CN112961989A (en) | Low-carbon high-aluminum steel and electroslag production method thereof | |
| CN101671762A (en) | Production method for medium and low alloy special steel | |
| CN109897931B (en) | Method for optimizing alloy addition in converter process production of high-alloy-quantity easily-oxidizable element steel | |
| CN110343811B (en) | Smelting and forging method of high-toughness alloy steel forging | |
| CN109112248B (en) | Converter smelting method of high manganese steel | |
| CN113774189B (en) | Steelmaking method suitable for producing high-strength steel on CSP production line | |
| CN114908208B (en) | Method for smelting high alloy steel with Mn content of more than 12% by utilizing converter end temperature | |
| KR100426852B1 (en) | A method for increasing terminal carbon in electric furnace | |
| CN113546964B (en) | Rolling method for improving ultrasonic flaw detection qualification rate of large-size high-carbon chromium-molybdenum bearing steel | |
| CN107723414A (en) | A kind of vanadium iron desulfurization method for smelting |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201124 |