CN111041368A - High-performance 82B wire rod steel and production method thereof - Google Patents
High-performance 82B wire rod steel and production method thereof Download PDFInfo
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- CN111041368A CN111041368A CN201911367434.4A CN201911367434A CN111041368A CN 111041368 A CN111041368 A CN 111041368A CN 201911367434 A CN201911367434 A CN 201911367434A CN 111041368 A CN111041368 A CN 111041368A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
-
- 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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention provides high-performance 82B wire rod steel and a production method thereof, wherein the high-performance 82B wire rod steel comprises the following components in percentage by mass: 0.80-0.82%, Si: 0.20 to 0.25%, Mn: 0.82-0.87%, P is less than or equal to 0.018%, S is less than or equal to 0.010%, Cr: 0.20-0.30%, Al: 0.003-0.010% and the balance of Fe and inevitable impurities. Compared with the prior art, the method has the advantages that the micro-aluminum is added into the molten steel after the converter, the subsequent LF furnace, continuous casting and rolling procedures are combined, the performance of the steel is improved, the aging problem is solved, the wire breakage rate of 82B wire rod steel in the drawing process is reduced, the product quality is improved, and huge benefits are brought to enterprises.
Description
Technical Field
The invention belongs to the field of smelting, and particularly relates to high-performance 82B wire rod steel and a production method thereof.
Background
The high-carbon steel SWRH82B wire rod steel is a raw material for producing prestressed strand steel, is mainly applied to the fields of bridges, houses, roads and the like, has large annual demand and is a mainstream product of a plurality of domestic steel mills at present.
However, the 82B wire rod steel needs to be drawn and stranded for multiple passes to obtain a steel strand steel with a certain specification, and in the processing process, the 82B wire rod steel needs to have sufficient strength, surface shrinkage and good drawing performance to avoid the brittle failure problem. However, because of the special characteristics of the 82B high-carbon steel, the strength and the hardness are high, so that the wire breakage is easy to occur in the processing process.
At present, the conventional process mainly reduces the broken wire rate by regulating and controlling the production process parameters of steelmaking and steel rolling, reduces the central carbon segregation by mainly reducing the superheat degree, increasing the cooling strength, electric stirring parameters and the like in the steelmaking production, controls the cooling speed by mainly controlling the opening degree of a fan, a heat-insulating cover, the speed of a roller way and the like in the steel rolling production, and reduces the broken wire rate of 82B to a certain extent through the process regulation.
Disclosure of Invention
The invention aims to provide high-performance 82B wire rod steel and a production method thereof, wherein the SWRH82B wire rod steel with stable performance is prepared by optimizing the component proportion of the wire rod steel, adding micro aluminum after a steel-making converter and combining a specific production process, so that the wire breakage rate of 82B is reduced, the section shrinkage rate of the steel is improved, the aging period is shortened, and the tensile strength meets the requirements.
The specific technical scheme of the invention is as follows:
a high-performance 82B wire rod steel comprises the following components in percentage by mass:
c: 0.80-0.82%, Si: 0.20 to 0.25%, Mn: 0.82-0.87%, P is less than or equal to 0.018%, S is less than or equal to 0.010%, Cr: 0.20-0.30%, Al: 0.003-0.010% and the balance of Fe and inevitable impurities.
The control and the effect of each chemical component in the invention have the following characteristics: c: carbon is a main alloy element of the steel material, the higher the carbon content is, the higher the hardness is, the better the wear resistance is, but the toughness and the corrosion resistance of the steel with the excessively high carbon content are deteriorated, and the carbon content is controlled to be 0.80-0.82%; si: the silicon can improve the hardness and the strength of steel in the steel, but the plasticity and the toughness of the steel with over-high silicon content can be obviously reduced, and the silicon content is controlled to be 0.20 to 0.25 percent; mn: manganese can effectively improve the strength and toughness of steel, eliminate the influence of sulfur and oxygen on hot brittleness of steel, improve the hot workability of steel and improve the cold brittleness tendency of steel, and the invention controls the ratio of Mn: 0.82 to 0.87; p: phosphorus is a harmful element in steel, and when the phosphorus content is high, brittle fracture is easy to occur during cold working, so that the phosphorus is generally harmful in the steel, and the phosphorus content is controlled to be less than or equal to 0.018 percent; s: sulfur is a harmful element in most steel, when the sulfur content is higher, the steel is easy to generate hot brittleness when being subjected to pressure processing at high temperature, and the sulfur content is controlled to be less than or equal to 0.010 percent; cr: chromium is a carbide forming element, the carbide has high strength, hardness and wear resistance, the performance is stronger when the chromium content is higher, and the chromium content is controlled to be 0.20-0.30%; al: aluminum is an element for strongly reducing a gamma-phase ring, has strong affinity with oxygen and nitrogen, can fix nitrogen and refine grains in steel, and improves the toughness of the steel, but the high-temperature strength and the toughness of the steel can be reduced due to overhigh content of the aluminum, and simultaneously, the difficulty is brought to smelting and casting, and the content of the Al is controlled as follows: 0.003 to 0.010 percent.
The invention provides a production method of high-performance 82B wire rod steel, which comprises the following steps:
1) smelting in a converter;
2) an LF furnace procedure;
3) a continuous casting process;
4) and (5) rolling.
Further, the step 1) is specifically as follows: adding molten iron and scrap steel into an LD converter for top-bottom combined blowing smelting, and adding lime, dolomite and magnesium balls for slagging in the smelting; adding high-carbon ferromanganese, silicomanganese and aluminum into a steel ladle during converter tapping;
further, in the step 1), adding molten iron and scrap steel into an LD converter for top-bottom combined blowing smelting, wherein lime, dolomite and magnesium balls are added for slagging in the smelting, the addition amount of the lime is 40-50 kg/t of steel, the addition amount of the dolomite is 20-25 kg/t of steel, and the addition amount of the magnesium balls is 4.0-4.5 kg/t of steel;
preferably, 3-5 kg/t of high-carbon ferromanganese, 5-7 kg/t of silicomanganese and 0.03-0.04kg/t of aluminum are added into the ladle when the converter tapping in the step 1) is carried out for 30 t.
Further, the tapping temperature in the step 1) is 1500-1530 ℃.
Further, in the step 2), 2-4kg/t of lime is added in the heating process of the LF furnace, 3-4kg/t of refining slag is added, the alkalinity R is controlled at 2.0, and the soft blowing time is ensured to be more than 15 min.
The continuous casting drawing speed in the step 3) is controlled at 1.4 m/min; further, in the continuous casting process in the step 3), the superheat degree is controlled to be 20-35 ℃, and the straightening temperature is more than or equal to 900 ℃.
In the step 4), the rolling temperature of the heating furnace is controlled between 1020 ℃ and 1050 ℃, and the temperature before the heating furnace is loaded on a cooling bed is controlled between 890 ℃ and 910 ℃.
Further, in the step 4), the rolling production specification is phi 12.5.
The invention adds a certain amount of micro aluminum after the converter, which has strong affinity with oxygen and nitrogen, can inhibit recrystallization and grain growth after recrystallization in the rolling process, can fix free nitrogen in steel, forms fine aluminum nitride particles to inhibit growth of austenite grains, plays a role in fine grain strengthening, thereby improving the tensile strength of steel and improving the plasticity of steelAnd (4) the performance and the timeliness. However, the aluminum content should not be too high, which would lead to the formation of a large amount of Al2O3Impurities are easy to cause continuous casting flocculation, which brings difficulties to smelting and casting, and the B-type Al2O3The inclusion in the rolled stock reduces the high-temperature strength and toughness thereof, and easily causes brittle fracture of the finished product. Therefore, the addition of aluminum into the 82B molten steel improves the tensile strength and the timeliness of the 82B finished product, and simultaneously, excessive Al is not added2O3The inclusion causes a reduction in its performance.
Compared with the prior art, the method has the advantages that the micro-aluminum is added into the molten steel after the converter, the subsequent LF furnace, continuous casting and rolling procedures are combined, the performance of the steel is improved, the aging problem is solved, the wire breakage rate of 82B wire rod steel in the drawing process is reduced, the product quality is improved, and huge benefits are brought to enterprises.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1 to example 3
A high-performance 82B wire rod steel comprises the following components in percentage by mass: see table 1 below, with the balance being Fe and unavoidable impurities.
Comparative examples 1 to 3
An 82B wire rod steel comprises the following components in percentage by mass: see table 1 below, with the balance being Fe and unavoidable impurities.
TABLE 1 chemical composition and weight percent of examples 1-3 and comparative examples 1-3%
The method for producing the 82B wire rod steel of the above examples 1 to 3 and comparative examples 1 to 3 includes the steps of:
1) smelting in a converter: 105t of molten iron and 35t of scrap steel are added into an LD converter for top-bottom combined blowing smelting, lime, dolomite and magnesium balls are added for slagging in the smelting, the addition amount of the lime is 40-50 kg/t of steel, the addition amount of the dolomite is 20-25 kg/t of steel, the addition amount of the magnesium balls is 4.0-4.5 kg/t of steel, and 3-5 kg/t of high-carbon ferromanganese, 5-7 kg/t of silicon-manganese and 0.03-0.04kg/t of aluminum are added into a steel ladle when 30t of converter tapping is carried out. The tapping temperature is 1500-1530 ℃;
2) an LF furnace process: adding lime 2-4kg/t, refining slag 3-4kg/t, controlling alkalinity R at 2.0, and ensuring soft blowing time to be more than 15 min;
3) and (3) continuous casting process: the continuous casting drawing speed is controlled to be 1.4m/min, the superheat degree is controlled to be 20-35 ℃, and the straightening temperature is more than or equal to 900 ℃;
4) a rolling procedure: the production specification is phi 12.5, the starting temperature of the heating furnace is controlled between 1020 ℃ and 1050 ℃, and the temperature before the heating furnace is loaded on a cooling bed is controlled between 890 ℃ and 910 ℃.
The specific material addition and process parameters in the production method of the 82B wire rod steel of the above examples 1 to 3 and comparative examples 1 to 3 are shown in the following tables 1 and 2.
TABLE 1 addition of materials for examples 1-3 and comparative examples 1-3
TABLE 2 Process parameters for examples 1-3 and comparative examples 1-3
The tensile strength and reduction of area of 82B steel produced by the above method are shown in table 3.
TABLE 3 tensile Strength and reduction of area data for 82B steels produced in examples 1-3 and comparative examples 1-3
The following conclusions can be drawn from table 3: when the Al content is controlled to be 0.003-0.010%, the reduction of area of the steel is improved, and the aging period is shortened; when the Al content is less than 0.003 percent, the reduction of area of the steel is qualified, but is less than that of the micro-aluminum steel, and the service life is prolonged; when the Al content exceeds 0.010%, the reduction of area of the steel is reduced and the aging period is also prolonged.
The 82B steel produced by the method has different aluminum contents, and the performance detection of the produced samples is as follows in the following table 4:
TABLE 4 Final Properties of 5.05mm of 82B steels of different Al contents according to the invention
According to the invention, by feeding a certain amount of aluminum and regulating and controlling the production process, the performance and the section shrinkage rate can be improved, the aging period can be shortened, the wire breakage rate in the drawing process is reduced, the product quality is improved, and finally the brand popularity of enterprises can be improved, which can not be estimated by the specific amount.
Claims (10)
1. The high-performance 82B wire rod steel is characterized by comprising the following components in percentage by mass:
c: 0.80-0.82%, Si: 0.20 to 0.25%, Mn: 0.82-0.87%, P is less than or equal to 0.018%, S is less than or equal to 0.010%, Cr: 0.20-0.30%, Al: 0.003-0.010% and the balance of Fe and inevitable impurities.
2. A method of producing the high performance 82B wire rod of claim 1, comprising the steps of:
1) smelting in a converter;
2) an LF furnace procedure;
3) a continuous casting process;
4) and (5) rolling.
3. The production method according to claim 2, wherein step 1) is specifically: adding molten iron and scrap steel into an LD converter for top-bottom combined blowing smelting, and adding lime, dolomite and magnesium balls for slagging in the smelting; and adding high-carbon ferromanganese, silicomanganese and aluminum into the steel ladle when tapping from the converter.
4. The production method of claim 2, wherein 3 to 5kg/t of high carbon ferromanganese, 5 to 7kg/t of silicomanganese and 0.03 to 0.04kg/t of aluminum are added to the ladle at 30t of the converter steel tapping in the step 1).
5. The production method according to claim 2, wherein the tapping temperature in step 1) is 1500-1530 ℃.
6. The production method of claim 2, wherein lime is added in 2-4kg/t and refining slag is added in 3-4kg/t during the heating process of the LF furnace in the step 2).
7. The production method according to claim 2, wherein the continuous casting speed in the step 3) is controlled to 1.4 m/min.
8. The production method according to claim 2, wherein in the continuous casting process in the step 3), the superheat degree is controlled to be 20-35 ℃, and the straightening temperature is more than or equal to 900 ℃.
9. The production method according to claim 2, wherein in the step 4), the start rolling temperature of the heating furnace is controlled to be 1020 to 1050 ℃.
10. The production method according to claim 2, wherein in the step 4), the temperature before the cooling bed is controlled to be 890-910 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911367434.4A CN111041368A (en) | 2019-12-26 | 2019-12-26 | High-performance 82B wire rod steel and production method thereof |
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| CN201911367434.4A CN111041368A (en) | 2019-12-26 | 2019-12-26 | High-performance 82B wire rod steel and production method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111471831A (en) * | 2020-05-18 | 2020-07-31 | 芜湖新兴铸管有限责任公司 | Ternary refining slag for high-carbon stranded wire steel, high-carbon stranded wire steel and slagging method thereof |
| CN114000048A (en) * | 2021-09-29 | 2022-02-01 | 武钢集团昆明钢铁股份有限公司 | SWRH82B hot-rolled wire rod for prestress steel strand with nominal diameter of 12.5mm and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107208208A (en) * | 2014-12-05 | 2017-09-26 | 新日铁住金株式会社 | The carbon steel wire rod with high of excellent in wire-drawing workability |
-
2019
- 2019-12-26 CN CN201911367434.4A patent/CN111041368A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107208208A (en) * | 2014-12-05 | 2017-09-26 | 新日铁住金株式会社 | The carbon steel wire rod with high of excellent in wire-drawing workability |
Non-Patent Citations (1)
| Title |
|---|
| 刘章满等: "SWRH82B热轧盘条生产工艺与实践", 《鞍钢技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111471831A (en) * | 2020-05-18 | 2020-07-31 | 芜湖新兴铸管有限责任公司 | Ternary refining slag for high-carbon stranded wire steel, high-carbon stranded wire steel and slagging method thereof |
| CN114000048A (en) * | 2021-09-29 | 2022-02-01 | 武钢集团昆明钢铁股份有限公司 | SWRH82B hot-rolled wire rod for prestress steel strand with nominal diameter of 12.5mm and preparation method thereof |
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