CN113278869A - Smelting process and production method of blank for atmospheric corrosion resistant steel bar - Google Patents
Smelting process and production method of blank for atmospheric corrosion resistant steel bar Download PDFInfo
- Publication number
- CN113278869A CN113278869A CN202110495234.8A CN202110495234A CN113278869A CN 113278869 A CN113278869 A CN 113278869A CN 202110495234 A CN202110495234 A CN 202110495234A CN 113278869 A CN113278869 A CN 113278869A
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- CN
- China
- Prior art keywords
- blank
- steel bar
- corrosion resistant
- atmospheric corrosion
- resistant steel
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Classifications
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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
- C22C38/02—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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
Abstract
A blank for atmospheric corrosion resistant steel bars comprises the chemical components of C, Si, Mn, P, S, Cr, Ni, Cu and V, and the balance of Fe and inevitable impurities in percentage by weight. The method does not need pretreatment on molten iron, and obtains the blank of the atmospheric corrosion resistant reinforcing steel bar with high purity and low defect by optimizing converter double-slag dephosphorization operation, converter tapping deoxidation operation, LF furnace slagging system, deoxidation system, aluminum content control, soft blowing system, continuous casting protection pouring, electromagnetic stirring and ultra-weak cooling system.
Description
Technical Field
The invention relates to a process for smelting a blank for a steel bar, in particular to a process for smelting a blank for an atmospheric corrosion resistant steel bar and a production method thereof.
Background
The steel bar is used as an important building material and widely applied to modern engineering construction, and the steel bar is required to have certain strength to bear various forces and certain corrosion resistance in the using process. In order to meet the requirement of the market on the steel bar, a smelting process of a blank for the atmospheric corrosion resistant steel bar and a production method thereof are specially developed.
Disclosure of Invention
The invention provides a smelting process of a blank for atmospheric corrosion resistant steel bars and a production method thereof.
Adding high-aluminum refining slag and steel core aluminum in the converter tapping process, using aluminum particles and ferrosilicon powder to carry out diffusion deoxidation in the refining furnace, manufacturing high-alkalinity ternary slag system (CaO-SiO 2-Al2O 3) refining slag by the refining furnace, adsorbing impurities in molten steel, confirming that the AIt content is more than 0.020% when the oxygen determination of the refining furnace is less than 5ppm, or supplementing aluminum by using the steel core aluminum, then carrying out calcium wire feeding treatment, and finally promoting the impurities to float into the slag by soft blowing to improve the purity of the molten steel.
The continuous casting adopts the compound flow control and the automatic control of the stopper rod, so that the stability of the liquid level of the crystallizer in the pouring process is ensured; protective pouring is adopted in the pouring process to prevent the molten steel from being secondarily oxidized; electromagnetic stirring is carried out by using a crystallizer to promote impurities to float upwards and improve the isometric crystal rate of the continuous casting billet; and an ultra-weak cooling system is adopted in the pouring process, and finally the blank for the atmospheric corrosion resistant reinforcing steel bar with high purity and low defect is obtained.
Carbon: at present, the C content of the common hot-rolled ribbed steel bar is 0.18-0.25%, the performance requirements and the amount of other alloy elements are comprehensively considered, the C content of the steel for the low-temperature steel bar is 0.05-0.15%, and the reduction of the C content is beneficial to improving the welding performance and the plasticity and the toughness.
Silicon: si can promote precipitation of proeutectoid ferrite, has little influence on pearlite formation, is low in cost, can improve A3 and A1 critical points, and has strong solid solution strengthening effect.
Manganese: mn can reduce the critical points of A3 and A1, delay pearlite transformation and ferrite transformation, and has the functions of solid solution strengthening and hardenability improvement.
Nickel: ni has the effects of refining the structure of steel, improving the low-temperature performance of the steel, strengthening solid solution and improving hardenability.
The method does not need pretreatment on the molten iron, and obtains the blank of the atmospheric corrosion resistant steel bar with high purity and low defect by optimizing converter double-slag dephosphorization operation, converter tapping deoxidation operation, LF furnace slagging system, deoxidation system, aluminum content, soft blowing system, continuous casting protection pouring, electromagnetic stirring and ultra-weak cooling system.
Detailed Description
In order to obtain a qualified blank for the atmospheric corrosion resistant steel bar, the following measures are mainly adopted:
(1) the converter adopts double-slag operation, the end point carbon is controlled within 0.05 percent, and the end point phosphorus is controlled within 0.008 percent.
(2) The converter adopts the sliding plate to block slag and tap, so that the slag discharging amount during tapping is reduced, the phosphorus return amount during tapping is controlled within 0.002 percent, the slag discharging amount during tapping of the converter is reduced, and the refining and deoxidation burden is reduced. And steel core aluminum is added in the converter tapping process, so that the content of ALs in the station of the refining furnace is ensured to be about 0.040%.
(3) In order to ensure good refining effect and optimize a refining and slagging process, the alkalinity of refining slag is controlled to be 3.5-4.0, and aluminum particles and ferrosilicon powder are used for deoxidation operation to produce a ternary slag system (CaO-SiO)2-Al2O3) And the calcium aluminate inclusion generated after adding aluminum is absorbed. The steel tapping components of the refining furnace are controlled according to the following table:
| composition (I) | C | Si | Mn | P | S | Cr | Ni | Cu | V | Alt |
| Inner control range | 0.08～0.13 | 0.45～0.65 | 1.00～1.20 | ≤0.025 | ≤0.020 | 0.15～0.35 | 0.40～0.55 | 0.35～0.55 | 0.120～0.130 | ＞0.020 |
(4) After the free oxygen content in the steel is measured to be 5ppm by an oxygen determinator for the refining furnace, the Alt content of the molten steel is confirmed to be more than 0.020%, otherwise, the steel core aluminum is used for aluminum increasing operation.
(5) After the aluminum content in the steel is qualified, calcium treatment is carried out on the molten steel by feeding calcium wires, the calcium-aluminum ratio is controlled to be 0.08-0.10, the impurities are promoted to be denatured, and 12CaO 7 Al with a low melting point is generated2O3Or CaO 2 Al2O3。
(6) The refining furnace adopts an automatic argon blowing technology to control the bottom blowing flow of the ladle, on one hand, the floating of impurities is promoted, the fluidity of molten steel is improved, and the nozzle nodulation is avoided. On the other hand, secondary oxidation of aluminum element in the soft blowing stage is reduced.
(7) The continuous casting adopts the duplex flow control and the automatic control of the stopper rod, ensures the stability of the liquid level of the crystallizer in the pouring process, and avoids the slag entrapment of the crystallizer.
(8) Full-protection pouring is adopted in the continuous casting pouring process, and secondary oxidation of molten steel in the pouring process is prevented.
(9) In the casting process, a crystallizer is adopted for electromagnetic stirring, so that the floating of impurities in the steel is further promoted, and the isometric crystal rate of the continuous casting billet is improved.
(10) An ultra-weak cooling system is adopted in the continuous casting pouring process, so that the low-power quality of a casting blank is improved.
The invention has been described in an illustrative manner, and it is to be understood that the invention is not limited to the precise form disclosed, and that various insubstantial modifications of the inventive concepts and solutions, or their direct application to other applications without such modifications, are intended to be covered by the scope of the invention.
Claims (2)
1. A smelting process of blank for atmospheric corrosion resistant steel bar and a production method thereof are characterized in that: the steel bar blank comprises the following chemical components in percentage by weight: 0.08-0.13%, Si: 0.45-0.65%, Mn: 1.00-1.20%, P: less than or equal to 0.025 percent, S: not more than 0.02%, Cr 0.15-0.35%, Ni: 0.40-0.55%, Cu: 0.35-0.55%, V: 0.120-0.130%, Alt > 0.020, and the balance of Fe and inevitable impurities.
2. The atmospheric corrosion resistant steel bar blank smelting process and the production method thereof as claimed in claim 1, wherein the process comprises the following steps: the method comprises converter double-slag dephosphorization operation, converter tapping deoxidation operation, LF furnace slagging system, deoxidation system, aluminum content, soft blowing system, continuous casting protective pouring, electromagnetic stirring and ultra-weak cooling system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110495234.8A CN113278869A (en) | 2021-05-07 | 2021-05-07 | Smelting process and production method of blank for atmospheric corrosion resistant steel bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110495234.8A CN113278869A (en) | 2021-05-07 | 2021-05-07 | Smelting process and production method of blank for atmospheric corrosion resistant steel bar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113278869A true CN113278869A (en) | 2021-08-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110495234.8A Pending CN113278869A (en) | 2021-05-07 | 2021-05-07 | Smelting process and production method of blank for atmospheric corrosion resistant steel bar |
Country Status (1)
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62188754A (en) * | 1986-02-14 | 1987-08-18 | Mitsubishi Steel Mfg Co Ltd | Corrosion resistant steel reinforcing bar for concrete |
| JPH05171265A (en) * | 1991-12-20 | 1993-07-09 | Sumitomo Metal Ind Ltd | Production of steel material with high atmosphere corrosion resistance for steel frame structure excellent in high temperature strength characteristic |
| JP2012188754A (en) * | 2011-02-25 | 2012-10-04 | Jfe Steel Corp | Steel with excellent weather resistance |
| CN109023041A (en) * | 2018-07-24 | 2018-12-18 | 包头钢铁（集团）有限责任公司 | 400MPa grades of antidetonation anti-chlorine ion corrosion reinforcing bars and its manufacturing method |
| CN109402508A (en) * | 2018-11-12 | 2019-03-01 | 东北大学 | A kind of low-carbon microalloyed Q690 grade high-strength weathering steel and preparation method thereof |
| CN111876654A (en) * | 2020-07-01 | 2020-11-03 | 石横特钢集团有限公司 | Production method of low-temperature impact resistant blank for D-level power angle steel |
-
2021
- 2021-05-07 CN CN202110495234.8A patent/CN113278869A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62188754A (en) * | 1986-02-14 | 1987-08-18 | Mitsubishi Steel Mfg Co Ltd | Corrosion resistant steel reinforcing bar for concrete |
| JPH05171265A (en) * | 1991-12-20 | 1993-07-09 | Sumitomo Metal Ind Ltd | Production of steel material with high atmosphere corrosion resistance for steel frame structure excellent in high temperature strength characteristic |
| JP2012188754A (en) * | 2011-02-25 | 2012-10-04 | Jfe Steel Corp | Steel with excellent weather resistance |
| CN109023041A (en) * | 2018-07-24 | 2018-12-18 | 包头钢铁（集团）有限责任公司 | 400MPa grades of antidetonation anti-chlorine ion corrosion reinforcing bars and its manufacturing method |
| CN109402508A (en) * | 2018-11-12 | 2019-03-01 | 东北大学 | A kind of low-carbon microalloyed Q690 grade high-strength weathering steel and preparation method thereof |
| CN111876654A (en) * | 2020-07-01 | 2020-11-03 | 石横特钢集团有限公司 | Production method of low-temperature impact resistant blank for D-level power angle steel |
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Application publication date: 20210820 |
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