CN110735086A - control process for solving problem of unobvious yield of niobium-containing deformed steel bars - Google Patents
control process for solving problem of unobvious yield of niobium-containing deformed steel bars Download PDFInfo
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- CN110735086A CN110735086A CN201910970781.XA CN201910970781A CN110735086A CN 110735086 A CN110735086 A CN 110735086A CN 201910970781 A CN201910970781 A CN 201910970781A CN 110735086 A CN110735086 A CN 110735086A
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- niobium
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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
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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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
- C22C38/04—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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
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- Physics & Mathematics (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
The invention relates to the technical field of metallurgy, in particular to control processes for solving the problem of unobvious yield of niobium-containing deformed steel bars, which comprise the following operations of controlling the niobium content to be 0.020-0.030%, controlling the carbon content of molten steel to be 0.21-0.24%, controlling the manganese content of the molten steel to be lower than 1.3-1.45%, controlling the initial rolling temperature to be 980-1050 ℃, controlling the final rolling temperature to be 880-900 ℃, and controlling the temperature of an upper cooling bed to be 850-900 ℃.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to control processes for solving the problem of unobvious yield of niobium-containing deformed steel.
Background
After 2018, China cancels the production permission of secondary deformed steel bars, and completely changes to the production of deformed steel bars with more than three HRB400 grades, the three-grade deformed steel bars belong to the category of low-alloy high-strength steel, the steel strengthening mechanism comprises solid solution strengthening, precipitation strengthening and fine grain strengthening, wherein the microalloy precipitation strengthening and fine grain strengthening effects of niobium, vanadium and titanium elements are most obvious, the price of vanadium-nitrogen alloy is ten thousand yuan/ton sharply, the niobium microalloy strengthening effect is the best, but the obvious defect of yield is easy to generate, the niobium microalloying of a plurality of steel works in China cannot achieve the satisfactory effect, in order to avoid the unidentified yield strength of the deformed steel bars, many steel works in China adopt niobium-titanium composite microalloying and molten steel strong deoxidation, and the continuous casting process is protected, but the adoption of the process method has the following defects:
1. the niobium-titanium composite micro-alloying increases the production cost of the deformed steel bar;
2. titanium is an easily oxidized element, and the yield is very unstable;
3. titanium element is oxidized to produce high-melting-point titanium oxide, so that the problems of molten steel flocculation, continuous casting interruption and the like are easily caused;
disclosure of Invention
The invention aims to solve the technical problem of providing control processes for solving the problem of unobvious yield of niobium-containing deformed steel bar, which have low cost and can overcome the problems of unstable components of titanium oxide and flocculation flow of molten steel, and the invention is realized by the following technical scheme:
control process for solving the problem of unobvious yield of the niobium-containing deformed steel bar, which comprises the following operations:
controlling the content of niobium to be 0.020-0.030%;
controlling the carbon content of the molten steel to be 0.21-0.24%;
controlling the manganese content of the molten steel to be lower than 1.3-1.5%;
controlling the initial rolling temperature to be 980-1050 ℃;
controlling the finish rolling temperature to 880-900 ℃;
the temperature of the upper cooling bed is controlled to 850-.
Specific example A control process for solving the problem of insignificant yield of niobium-containing deformed steel,
controlling the content of niobium to be 0.020%;
controlling the carbon content of the molten steel to be 0.21%;
controlling the manganese content of the molten steel to be lower than 1.3 percent;
controlling the initial rolling temperature to be 980 ℃;
controlling the finish rolling temperature to be 880 ℃;
controlling the temperature of an upper cooling bed to be 850 ℃;
in the second embodiment, control processes for solving the problem of unobvious yield of the niobium-containing deformed steel,
controlling the content of niobium to be 0.030 percent;
controlling the carbon content of the molten steel to be 0.24%;
controlling the manganese content of the molten steel to be 1.5 percent;
controlling the initial rolling temperature to 1050 ℃;
controlling the finish rolling temperature to be 900 ℃;
the temperature of the upper cooling bed is controlled to be 900 ℃.
In the third concrete example, control processes for solving the problem of unobvious yield of the niobium-containing deformed steel,
controlling the content of niobium to be 0.025 percent;
controlling the carbon content of the molten steel to be 0.22%;
controlling the manganese content of the molten steel to be 1.4 percent;
controlling the initial rolling temperature to be 1015 ℃;
controlling the finish rolling temperature to be 890 ℃;
the temperature of the upper cooling bed is controlled to be 875 ℃.
Advantageous effects of the invention
The control processes for solving the problem of unobvious yield of the niobium-containing deformed steel bar, which are provided by the invention, only adopt niobium single element micro-alloying, thereby reducing the alloying cost, improving the fluidity of molten steel and stabilizing the yield strength of the niobium micro-alloying deformed steel bar.
Detailed Description
control process for solving the problem of unobvious yield of the niobium-containing deformed steel bar, which comprises the following operations:
controlling the content of niobium to be 0.020-0.030%;
controlling the carbon content of the molten steel to be 0.21-0.24%;
controlling the manganese content of the molten steel to be lower than 1.3-1.5%; during operation, only the microelements with the contents are added into the molten steel in the smelting process.
Controlling the initial rolling temperature to be 980-1050 ℃;
controlling the finish rolling temperature to 880-900 ℃;
the temperature of the upper cooling bed is controlled to 850-.
Specific example A control process for solving the problem of insignificant yield of niobium-containing deformed steel,
controlling the content of niobium to be 0.020%;
controlling the carbon content of the molten steel to be 0.21%;
controlling the manganese content of the molten steel to be lower than 1.3 percent;
controlling the initial rolling temperature to be 980 ℃;
controlling the finish rolling temperature to be 880 ℃;
controlling the temperature of an upper cooling bed to be 850 ℃;
in the second embodiment, control processes for solving the problem of unobvious yield of the niobium-containing deformed steel,
controlling the content of niobium to be 0.030 percent;
controlling the carbon content of the molten steel to be 0.24%;
controlling the manganese content of the molten steel to be 1.5 percent;
controlling the initial rolling temperature to 1050 ℃;
controlling the finish rolling temperature to be 900 ℃;
the temperature of the upper cooling bed is controlled to be 900 ℃.
In the third concrete example, control processes for solving the problem of unobvious yield of the niobium-containing deformed steel,
controlling the content of niobium to be 0.025 percent;
controlling the carbon content of the molten steel to be 0.22%;
controlling the manganese content of the molten steel to be 1.4 percent;
controlling the initial rolling temperature to be 1015 ℃;
controlling the finish rolling temperature to be 890 ℃;
the temperature of the upper cooling bed is controlled to be 875 ℃.
Due to the control process provided by the invention, the appropriate contents of carbon, manganese and niobium elements are adjusted, the controlled cooling temperature is adjusted, the crystal grains are refined, a microstructure with excellent performance is generated, the steel performance is improved, the defect that the yield of the deformed steel bar is not obvious is overcome, and the inspection data are shown in a table in detail.
As can be seen from the table above, the yield strength and tensile strength of the steel produced by the control process meet the standard requirements.
In conclusion, the control processes for solving the problem of unobvious yield of the niobium-containing deformed steel bar, which are protected by the invention, only adopt niobium single element for microalloying, reduce the alloying cost, overcome the problems of unstable components of titanium oxide-prone elements and molten steel flocculation, control the initial rolling temperature and the upper cooling bed temperature by adjusting the contents of carbon and manganese in the molten steel, refine grains and overcome the defect of unobvious yield of the deformed steel bar.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1, control process for solving the problem of unobvious yield of niobium-containing deformed steel, which is characterized by comprising the following operations:
controlling the content of niobium to be 0.020-0.030%;
controlling the carbon content of the molten steel to be 0.21-0.24%;
controlling the manganese content of the molten steel to be lower than 1.3-1.5%;
controlling the initial rolling temperature to be 980-1050 ℃;
controlling the finish rolling temperature to 880-900 ℃;
the temperature of the upper cooling bed is controlled to 850-.
2. A control process for solving the problem of insignificant yield of the niobium-containing deformed steel bar as claimed in claim 1,
controlling the content of niobium to be 0.020%;
controlling the carbon content of the molten steel to be 0.21%;
controlling the manganese content of the molten steel to be lower than 1.3 percent;
controlling the initial rolling temperature to be 980 ℃;
controlling the finish rolling temperature to be 880 ℃;
the temperature of the upper cooling bed is controlled to be 850 ℃.
3. A control process for solving the problem of insignificant yield of the niobium-containing deformed steel bar as claimed in claim 1,
controlling the content of niobium to be 0.030 percent;
controlling the carbon content of the molten steel to be 0.24%;
controlling the manganese content of the molten steel to be 1.5 percent;
controlling the initial rolling temperature to 1050 ℃;
controlling the finish rolling temperature to be 900 ℃;
the temperature of the upper cooling bed is controlled to be 900 ℃.
4. A control process for solving the problem of insignificant yield of the niobium-containing deformed steel bar as claimed in claim 1,
controlling the content of niobium to be 0.025 percent;
controlling the carbon content of the molten steel to be 0.22%;
controlling the manganese content of the molten steel to be 1.4 percent;
controlling the initial rolling temperature to be 1015 ℃;
controlling the finish rolling temperature to be 890 ℃;
the temperature of the upper cooling bed is controlled to be 875 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910970781.XA CN110735086A (en) | 2019-10-14 | 2019-10-14 | control process for solving problem of unobvious yield of niobium-containing deformed steel bars |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910970781.XA CN110735086A (en) | 2019-10-14 | 2019-10-14 | control process for solving problem of unobvious yield of niobium-containing deformed steel bars |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101144137A (en) * | 2007-09-22 | 2008-03-19 | 马鞍山钢铁股份有限公司 | Steel for niobium-containing high-strength corrosion-resistant steel bar and rolling technique thereof |
| CN109554624A (en) * | 2018-12-12 | 2019-04-02 | 张家港宏昌钢板有限公司 | 400MPa grades of reinforcing bars of Nb, N complex intensifying and its manufacturing method |
-
2019
- 2019-10-14 CN CN201910970781.XA patent/CN110735086A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101144137A (en) * | 2007-09-22 | 2008-03-19 | 马鞍山钢铁股份有限公司 | Steel for niobium-containing high-strength corrosion-resistant steel bar and rolling technique thereof |
| CN109554624A (en) * | 2018-12-12 | 2019-04-02 | 张家港宏昌钢板有限公司 | 400MPa grades of reinforcing bars of Nb, N complex intensifying and its manufacturing method |
Non-Patent Citations (1)
| Title |
|---|
| 完卫国等: "节约型铌微合金化HRB400钢筋的成分与工艺研究", 《钢铁研究》 * |
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