CN110872639A - Smelting method for controlling titanium content of high-carbon chromium bearing steel - Google Patents
Smelting method for controlling titanium content of high-carbon chromium bearing steel Download PDFInfo
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
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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
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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
- C21C7/0025—Adding carbon material
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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
- C21C7/0068—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by introducing material into a current of streaming metal
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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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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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
- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- 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
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- Y02P10/20—Recycling
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Abstract
The smelting method for controlling the titanium content of the high-carbon chromium bearing steel can control the average titanium content of the finished high-carbon chromium bearing steel product to be 0.0012 percent, and meets the requirement of the high-carbon chromium bearing steel on ultralow titanium content; the smelting method for controlling the titanium content of the high-carbon chromium bearing steel has the advantages of concise and safe smelting operation flow, obvious effect contrast, obvious improvement on the control of the titanium content of the high-end bearing steel, and popularization and application.
Description
Technical Field
The invention relates to the field of metal material processing, in particular to a smelting method for controlling titanium content of high-carbon chromium bearing steel.
Background
At present, the high-carbon chromium bearing steel produced by various iron and steel metallurgical production enterprises mainly comprises the following components: [C]0.95 to 1.05 percent, 0.95 to 1.25 percent of Mn, 0.45 to 0.75 percent of Si, 1.40 to 1.65 percent of Cr, 0.0000 to 0.0015 percent of Ti and 0.0000 to 0.0015 percent of O, wherein the high-carbon chromium bearing steel is mainly used for manufacturing bearing rings, balls and other fluid bodies, so the fatigue life of the high-carbon chromium bearing steel must be ensured, titanium nitride inclusions in the high-carbon chromium bearing steel can damage the continuity of a steel metal matrix, stress concentration generated in an external processing condition can cause material cracking, and the titanium content in the high-carbon chromium bearing steel must reach the range of 0.0000 to 0.0015 percent in the production process.
Taking the national standard 'high-carbon chromium bearing steel' GB/T18254-2016 as an example, the titanium content in the steel is required to be as follows: 0.0000-0.0050% of high-quality steel, 0.0000-0.0030% of high-grade high-quality steel and 0.0000-0.0015% of special-grade high-quality steel.
The production process flow of the high-carbon chromium bearing steel in the prior art is as follows:
40 ton electric furnace (EAF) → Ladle Furnace (LF) → vacuum degassing furnace (VD) → die casting bottom pour 2.3t/3.7t ingot → blooming/forging.
The production process in the prior art mainly controls the titanium content of the high-carbon chromium bearing steel by the following means:
(1) in the process of the electric furnace, the oxygen element in the molten steel is utilized to oxidize and remove the titanium element;
(2) low-titanium alloy is adopted in the smelting process;
(3) the slag is used for adsorbing titanium oxide for removal.
However, the above-mentioned means do not deal with the increase in the titanium content in steel during the refining process.
The patent No. CN102383055A discloses a "production method for reducing titanium content in high-carbon bearing steel", which can control the titanium content to 0.0016-0.0027%, but the control range of the titanium content cannot meet the requirement that the steel grade of the high-carbon chromium bearing steel of the present application requires 0.0000% -0.0015% of titanium, and thus is obviously different from the present application. At present, no means for controlling the titanium content of the high-carbon chromium bearing steel in the later refining stage is available.
Disclosure of Invention
In order to control the titanium content of the high-carbon chromium bearing steel, the invention provides a smelting method for controlling the titanium content of the high-carbon chromium bearing steel, and the titanium content of the high-carbon chromium bearing steel produced by the method can be controlled to be 0.0000-0.0015%.
The invention relates to a smelting method for controlling titanium content of high-carbon chromium bearing steel, which comprises the following specific steps:
a smelting method for controlling titanium content of high-carbon chromium bearing steel comprises the following specific steps:
1) oxygen blowing is carried out on the molten steel discharged from the electric furnace, the titanium content in the molten steel is analyzed to be 0.0000% -0.0006% before tapping, the tapping temperature is 1640-1660 ℃, and the oxygen content is 0.0200-0.0900%;
2) the oxidizing slag is strictly prevented from flowing into a ladle during electric furnace tapping, and is added into the ladle along with steel flow during the tapping process: 1.5-2.0 kg/t of deoxidizer aluminum ingot, 200-400 kg/furnace of lime and 250-350 kg/furnace of carbon powder;
3) adding low-titanium alloy-electrolytic manganese, high-purity ferrosilicon or low-titanium high-chromium into the steel tapping process in the step 2), and then smelting in a ladle furnace;
4) controlling the temperature of the ladle furnace at 1520-1560 ℃, sampling and analyzing after confirming that no residual carbon and silicon powder exist on the slag surface, and matching the aluminum content to 0.030% according to the sampling and analyzing;
5) adding low-titanium alloy-electrolytic manganese, high-purity ferrosilicon or low-titanium high-chromium into a ladle furnace;
6) adding lime into the ladle furnace, dividing the lime into 3 batches in total, wherein each batch is separated by 10 minutes, and the total adding amount is 600-700 kg;
7) diffusing and deoxidizing the foam slag produced by the carbon powder and the silicon powder in the ladle furnace, sampling and analyzing, adding silica to adjust the slag when the sulfur content is 0.000-0.005%, wherein the adding amount of the silica is 80-140 kg, and then discharging the slag out of the ladle furnace;
8) carrying out deslagging operation from the end of discharging the ladle furnace to the beginning of the vacuum degassing furnace, wherein the deslagging amount is controlled to be 50-60%, and feeding the slag into the vacuum degassing furnace for smelting after deslagging;
9) after vacuum treatment is carried out in a vacuum degassing furnace, the carbonized rice hulls are uniformly added on the slag surface in small bags, soft argon blowing is carried out for more than or equal to 25 minutes, and the argon pressure and the flow are adjusted on the basis that molten steel does not turn over the slag surface;
10) and 9) after the soft argon blowing treatment of the vacuum degassing furnace is finished, confirming that the temperature of the molten steel is in the range of 1500-1515 ℃, then performing die casting and pouring, finishing the smelting process, and performing subsequent primary rolling and forging processes.
The smelting method for controlling the titanium content of the high-carbon chromium bearing steel has the following beneficial effects that:
1. the smelting method for controlling the titanium content of the high-carbon chromium bearing steel can control the average titanium content of the finished high-carbon chromium bearing steel product to be 0.0012 percent, and meets the requirement of the high-carbon chromium bearing steel on ultralow titanium content;
2. the smelting method for controlling the titanium content of the high-carbon chromium bearing steel has the advantages of concise and safe smelting operation flow, obvious effect contrast, obvious improvement on the control of the titanium content of the high-end bearing steel, and popularization and application.
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Detailed Description
The following will describe the method of the present invention for controlling the titanium content of high-carbon chromium bearing steel in detail with reference to the examples.
The embodiment relates to wind power bearing steel GCr15SiMn, which comprises the following specific steps:
1) the method comprises the steps of firstly blowing oxygen into initial molten steel of an electric furnace to ensure that the titanium content in the analyzed molten steel before tapping is 0.0005 percent, the temperature is 1645 ℃, and the oxygen content is less than or equal to 0.0500 percent;
2) electric furnace tapping is added into a ladle along with steel flow: 2.0kg/t of deoxidizer aluminum ingot, 300kg of lime and 300kg of carbon powder, and adding low-titanium alloy-electrolytic manganese, high-purity ferrosilicon or low-titanium high-chromium in the tapping process, and then smelting in a ladle furnace;
3) the temperature of the ladle furnace is raised to 1550 ℃, sampling and analyzing are carried out, the content of aluminum is added to 0.030 percent according to the analysis component result, and low-titanium alloy-electrolytic manganese, high-purity silicon iron or low-titanium high-chromium is added;
4) adding lime into the ladle furnace in three batches, wherein each batch is separated by 10 minutes, and the total adding amount is 600 kg;
5) diffusing and deoxidizing foam slag produced by using carbon powder and silicon powder in a ladle furnace, adding silica to adjust slag when the sulfur content is less than or equal to 0.002% through sampling analysis, and then discharging the slag out of the ladle furnace, wherein the adding amount of the slag is 120 kg;
6) pouring slag from the ladle furnace to 60% of the total slag before the vacuum degassing furnace is started, and feeding the slag into the vacuum degassing furnace for smelting;
7) after vacuum treatment in a vacuum degassing furnace, uniformly adding the carbonized rice hulls on the slag surface of the steel ladle, and blowing argon for 40 minutes in a soft mode, wherein the argon blowing strength ensures that the molten steel does not turn over the slag surface;
8) after the soft argon blowing of the vacuum degassing furnace is finished, the temperature of the molten steel is confirmed to be 1507 ℃, and the subsequent die casting and pouring are carried out until the smelting process is finished, and the subsequent primary rolling and forging processes are carried out.
The invention relates to a smelting method for controlling titanium content of high-carbon chromium bearing steel, which is characterized in that the components of finished products before and after the smelting are compared with the components in the following tables 1 and 2:
| sample furnace number | Steel grade | C | Si | Mn | P | S | Cr | Ti |
| 757A0276 | GCr15SiMn | 0.97 | 0.61 | 1.05 | 0.007 | 0.003 | 1.50 | 0.0020 |
| 757A0277 | GCr15SiMn | 0.98 | 0.60 | 1.03 | 0.008 | 0.002 | 1.52 | 0.0018 |
TABLE 1 composition of the finished product before the practice of the invention, Unit (wt%)
| Sample furnace number | Steel grade | C | Si | Mn | P | S | Cr | Ti |
| 757A1618 | GCr15SiMn | 0.99 | 0.57 | 1.02 | 0.005 | 0.002 | 1.49 | 0.0010 |
| 757A1619 | GCr15SiMn | 0.98 | 0.55 | 1.03 | 0.008 | 0.002 | 1.47 | 0.0010 |
TABLE 2 composition of the finished product after the practice of the invention, Unit (wt%)
The steps and the embodiment of the invention relate to a sampling and sample preparation method for sampling and analyzing a chemical component determination sample of the national standard steel and iron of the people's republic of China, and the content of titanium in the steel is determined according to the regulation in the standard No. GB/T20066-.
The smelting method for controlling the titanium content of the high-carbon chromium bearing steel can control the average titanium content of the finished high-carbon chromium bearing steel product to be 0.0012 percent, and meets the requirement of the high-carbon chromium bearing steel on ultralow titanium content; the smelting method for controlling the titanium content of the high-carbon chromium bearing steel has the advantages of concise and safe smelting operation flow, obvious effect contrast, obvious improvement on the control of the titanium content of the high-end bearing steel, and popularization and application.
Claims (1)
1. A smelting method for controlling titanium content of high-carbon chromium bearing steel comprises the following specific steps:
1) oxygen blowing is carried out on the molten steel discharged from the electric furnace, the titanium content in the molten steel is analyzed to be 0.0000% -0.0006% before tapping, the tapping temperature is 1640-1660 ℃, and the oxygen content is 0.0200-0.0900%;
2) the oxidizing slag is strictly prevented from flowing into a ladle during electric furnace tapping, and is added into the ladle along with steel flow during the tapping process: 1.5-2.0 kg/t of deoxidizer aluminum ingot, 200-400 kg/furnace of lime and 250-350 kg/furnace of carbon powder;
3) adding low-titanium alloy-electrolytic manganese, high-purity ferrosilicon or low-titanium high-chromium into the steel tapping process in the step 2), and then smelting in a ladle furnace;
4) controlling the temperature of the ladle furnace at 1520-1560 ℃, sampling and analyzing after confirming that no residual carbon and silicon powder exist on the slag surface, and matching the aluminum content to 0.030% according to the sampling and analyzing;
5) adding low-titanium alloy-electrolytic manganese, high-purity ferrosilicon or low-titanium high-chromium into a ladle furnace;
6) adding lime into the ladle furnace, dividing the lime into 3 batches in total, wherein each batch is separated by 10 minutes, and the total adding amount is 600-700 kg;
7) diffusing and deoxidizing the foam slag produced by the carbon powder and the silicon powder in the ladle furnace, sampling and analyzing, adding silica to adjust the slag when the sulfur content is 0.000-0.005%, wherein the adding amount of the silica is 80-140 kg, and then discharging the slag out of the ladle furnace;
8) carrying out deslagging operation from the end of discharging the ladle furnace to the beginning of the vacuum degassing furnace, wherein the deslagging amount is controlled to be 50-60%, and feeding the slag into the vacuum degassing furnace for smelting after deslagging;
9) after vacuum treatment is carried out in a vacuum degassing furnace, the carbonized rice hulls are uniformly added on the slag surface in small bags, soft argon blowing is carried out for more than or equal to 25 minutes, and the argon pressure and the flow are adjusted on the basis that molten steel does not turn over the slag surface;
10) and 9) after the soft argon blowing treatment of the vacuum degassing furnace is finished, confirming that the temperature of the molten steel is in the range of 1500-1515 ℃, then performing die casting and pouring, finishing the smelting process, and performing subsequent primary rolling and forging processes.
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| CN201811015428.8A CN110872639A (en) | 2018-08-31 | 2018-08-31 | Smelting method for controlling titanium content of high-carbon chromium bearing steel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112251561A (en) * | 2020-09-30 | 2021-01-22 | 山东钢铁股份有限公司 | Method for smelting low-titanium steel in electric furnace under high molten iron ratio condition |
| CN114182056A (en) * | 2021-11-16 | 2022-03-15 | 南京钢铁股份有限公司 | Smelting control method for high-carbon chromium bearing steel titanium nitride inclusion |
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| CN103849710A (en) * | 2014-03-01 | 2014-06-11 | 首钢总公司 | Method for producing high-carbon-chromium bearing steel employing molten iron smelting process of electric furnace |
| CN107312906A (en) * | 2017-07-10 | 2017-11-03 | 西王金属科技有限公司 | A kind of smelting process of inexpensive ultrapure low titanium bearing steel |
| JP2018059148A (en) * | 2016-10-04 | 2018-04-12 | 日本冶金工業株式会社 | Fe-Cr-Ni ALLOY AND MANUFACTURING METHOD THEREFOR |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101376948A (en) * | 2007-08-27 | 2009-03-04 | 宝山钢铁股份有限公司 | Low-cost high-purity medium carbon bearing steel for automobile hub and manufacturing method thereof |
| CN101397628A (en) * | 2007-09-25 | 2009-04-01 | 宝山钢铁股份有限公司 | Continuous casting bearing steel round steel and method for producing the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112251561A (en) * | 2020-09-30 | 2021-01-22 | 山东钢铁股份有限公司 | Method for smelting low-titanium steel in electric furnace under high molten iron ratio condition |
| CN112251561B (en) * | 2020-09-30 | 2022-04-01 | 山东钢铁股份有限公司 | Method for smelting low-titanium steel in electric furnace under high molten iron ratio condition |
| CN114182056A (en) * | 2021-11-16 | 2022-03-15 | 南京钢铁股份有限公司 | Smelting control method for high-carbon chromium bearing steel titanium nitride inclusion |
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Effective date of registration: 20200521 Address after: 200940 room 1277, building 216, 1269 Shuishui Road, Baoshan District, Shanghai Applicant after: Baowu Special Metallurgy Co.,Ltd. Address before: 200940 No. 1269, Fisheries Road, Shanghai, Baoshan District Applicant before: BAOSTEEL SPECIAL STEEL Co.,Ltd. |
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Application publication date: 20200310 |
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