CN112430709A - Smelting method for cleaning high-construction steel refining molten steel - Google Patents
Smelting method for cleaning high-construction steel refining molten steel Download PDFInfo
- Publication number
- CN112430709A CN112430709A CN202011312155.0A CN202011312155A CN112430709A CN 112430709 A CN112430709 A CN 112430709A CN 202011312155 A CN202011312155 A CN 202011312155A CN 112430709 A CN112430709 A CN 112430709A
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- CN
- China
- Prior art keywords
- molten steel
- treatment
- controlled
- refining
- finished
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Classifications
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- 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
- C21C7/10—Handling in a vacuum
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- 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
-
- 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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
Abstract
The invention discloses a smelting method for cleaning refined molten steel of high-construction steel, which is characterized in that after 120 tons of molten steel are subjected to LF treatment, the refining end point temperature is increased to RH end point temperature + 30-40 ℃, C, Si and Mn in molten steel components are controlled to be target values +/-0.02%, Al in molten steel components is controlled to be target values +/-0.005%, Nb in molten steel components is controlled to be target values +/-0.003%, calcium-containing wires 200M +/-50M/furnace are fed after refining is finished, 80kg +/-5 kg of ferrotitanium is added within 3min of vacuum treatment in the RH treatment process, vacuumizing can be finished after pure degassing time is carried out for 17-22min after alloy addition is finished, and RH circulation gas is controlled to be 80M in the vacuumizing process3/h±10M3And h, finishing the whole RH treatment within 20-25 min. The method can greatly shorten the smelting time on the premise of quality and quantity preservation.
Description
Technical Field
The invention relates to a smelting method for cleaning high-construction steel refining molten steel.
Background
After LF treatment, the molten steel is hoisted to RH for treatment, the LF refining process is carried out with operations of molten steel temperature rise, alloying and the like, wire feeding calcium treatment is carried out after the treatment, and the RH refining process is carried out with fine adjustment on molten steel alloying.
Disclosure of Invention
The invention aims to provide a clean smelting method for high-construction steel refining molten steel, which can greatly shorten the smelting time on the premise of quality and quantity conservation.
The technical scheme for realizing the purpose of the invention is as follows: a smelting method for cleaning refined molten steel of high-construction steel comprises the steps of carrying out LF treatment on 120 tons of molten steel, increasing the refining end point temperature to RH end point temperature plus 30-40 ℃,controlling C, Si and Mn in molten steel components to be within +/-0.02% of target values, controlling Al in molten steel components to be within +/-0.005% of target values, controlling Nb in molten steel components to be within +/-0.003% of target values, feeding calcium-containing wire wires 200M +/-50M/furnace after refining is finished, adding 80kg +/-5 kg of ferrotitanium within 3min of vacuum treatment in the RH treatment process, finishing vacuumizing after the alloy is added and carrying out pure degassing for 17-22min, and controlling RH circulation gas to be within 80M in the vacuumizing process3/h±10M3The whole RH treatment time is completed within 20-25 min.
The method comprises the steps that an LF refining furnace raises the temperature of molten steel to the temperature required by RH refining, the components of the molten steel are controlled within a target range, wire feeding calcium treatment is carried out after the LF refining treatment is finished, the molten steel is hoisted to RH and then subjected to vacuum treatment, a small amount of alloy is added in the process, the vacuum treatment is finished within 3min before the vacuum treatment, the pure degassing time (defined as only vacuumizing and no material is added) is 17-22min later, the vacuum treatment can be finished when the temperature is measured to reach the target temperature, the molten steel is not subjected to calcium treatment, and the molten steel is calmed for 5-10min before continuous casting and pouring, so that the purpose of cleaning and purifying the molten steel is achieved, and the whole RH treatment time is.
After the new method is used, the RH treatment can be finished within 20-25min, and the total oxygen content in the molten steel can be controlled at 30 multiplied by 10-6. The application range is as follows: 120 ton molten steel RH refining treatment equipment can be adopted in the process of producing high-construction steel. The invention shortens the RH processing time in the RH production high-construction steel process and ensures the quality at the same time. Ensures the smooth production, so the application prospect of the technology is optimistic.
Detailed Description
A smelting method for cleaning refined molten steel of high-construction steel comprises the steps of after 120 tons of molten steel are subjected to LF treatment, increasing the refining end point temperature to RH end point temperature plus 30-40 ℃, controlling C, Si and Mn in molten steel components to be within +/-0.02% of target values, controlling Al in molten steel components to be within +/-0.005% of target values, controlling Nb in molten steel components to be within +/-0.003% of target values, feeding calcium-containing wires 200M +/-50M/furnace after refining is finished, adding 80kg +/-5 kg of ferrotitanium within 3min of vacuum treatment in the RH treatment process, finishing vacuum pumping after pure degassing for 17-22min after alloy addition is finished, and controlling RH circulation gas to be 80M in the vacuum pumping process3/h±10M3H, Whole RH treatmentThe time is finished within 20-25 min.
Claims (1)
1. A smelting method for cleaning high-construction steel refining molten steel is characterized by comprising the following steps: after LF treatment is carried out on 120 tons of molten steel, the refining end point temperature is increased to + 30-40 ℃ of RH end point temperature, C, Si and Mn in molten steel components are controlled to be within +/-0.02% of target values, Al in the molten steel components is controlled to be within +/-0.005% of target values, Nb in the molten steel components is controlled to be within +/-0.003%, calcium-containing wires are fed to a furnace at 200M +/-50M/min after refining, 80kg +/-5 kg of ferrotitanium is added within 3min of vacuum treatment in the RH treatment process, vacuumizing can be finished after pure degassing is carried out for 17-22min after alloy addition is finished, and RH circulation gas is controlled to be 80M in the vacuumizing process3/h±10M3And h, finishing the whole RH treatment within 20-25 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011312155.0A CN112430709A (en) | 2020-11-20 | 2020-11-20 | Smelting method for cleaning high-construction steel refining molten steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011312155.0A CN112430709A (en) | 2020-11-20 | 2020-11-20 | Smelting method for cleaning high-construction steel refining molten steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112430709A true CN112430709A (en) | 2021-03-02 |
Family
ID=74693250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011312155.0A Pending CN112430709A (en) | 2020-11-20 | 2020-11-20 | Smelting method for cleaning high-construction steel refining molten steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112430709A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116064998A (en) * | 2023-01-29 | 2023-05-05 | 新疆八一钢铁股份有限公司 | RH refining treatment process of Q235NH weathering steel |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110760643A (en) * | 2019-11-29 | 2020-02-07 | 新疆八一钢铁股份有限公司 | RH smelting method of high-construction steel Q390GJEZ15 steel grade |
-
2020
- 2020-11-20 CN CN202011312155.0A patent/CN112430709A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110760643A (en) * | 2019-11-29 | 2020-02-07 | 新疆八一钢铁股份有限公司 | RH smelting method of high-construction steel Q390GJEZ15 steel grade |
Non-Patent Citations (1)
| Title |
|---|
| 李立民等: "Z向高建钢洁净化生产工艺浅析", 《新疆钢铁》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116064998A (en) * | 2023-01-29 | 2023-05-05 | 新疆八一钢铁股份有限公司 | RH refining treatment process of Q235NH weathering steel |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20210302 |
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| WD01 | Invention patent application deemed withdrawn after publication |