CN112080707A - Low-niobium deformed steel bar and production method thereof - Google Patents
Low-niobium deformed steel bar and production method thereof Download PDFInfo
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- CN112080707A CN112080707A CN202010788888.5A CN202010788888A CN112080707A CN 112080707 A CN112080707 A CN 112080707A CN 202010788888 A CN202010788888 A CN 202010788888A CN 112080707 A CN112080707 A CN 112080707A
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- deformed steel
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- B21B1/463—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 in a continuous process, i.e. the cast not being cut before rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
-
- 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
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- 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
-
- 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
-
- 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
Abstract
The invention relates to the technical field of deformed steel bars and discloses low-niobium deformed steel bars, which comprise the following chemical components in percentage by mass: c: (0.10-0.40%), Mn < 1.80%, P < 0.050%, S < 0.050%, Si: (0.60-1.00%), Nb is less than or equal to 1.5%, and the balance is Fe, wherein the low-niobium deformed steel comprises the following chemical components in percentage by mass: c: 0.21%, Mn: 0.8%, P: 0.045%, S: 0.045%, Si: 0.52%, Nb: 0.2 percent of Fe and the balance of Fe, and the production method thereof can produce fine niobium carbide in the deformed steel bar by adding a small amount of niobium element in the deformed steel bar, thereby improving the strength and the hardness of the deformed steel bar, facilitating the use of the deformed steel bar and prolonging the service life of the deformed steel bar.
Description
Technical Field
The invention relates to the technical field of deformed steel bars, in particular to low-niobium deformed steel bars and a production method thereof.
Background
The thread steel is mainly used for concrete structure engineering of roads, railways, bridges, hydropower, houses, municipal construction and the like and is an important building material.
The deformed steel is divided into two categories of carbon steel and alloy steel according to chemical components. The carbon steel mainly comprises iron and carbon, the carbon content is 0.02-2.06%, and a small amount of silicon, manganese and trace amounts of sulfur and phosphorus are contained. Carbon steels are generally classified by carbon content as: low carbon steel (the carbon content is less than 0.25%), medium carbon steel (the carbon content is 0.25% -0.6%) and high carbon steel (the carbon content is more than 0.6%). The alloy steel has one or more alloy elements capable of improving the performance of steel besides iron and carbon, and the common alloy elements include manganese, silicon, chromium, niobium, titanium, vanadium and the like. The alloy steel is divided into low alloy steel (the total content of alloy elements is less than 5%), medium alloy steel (the total content of alloy elements is 5% -10%) and high alloy steel (the total content of alloy elements is more than 10%) according to the total content of alloy elements, niobium in the alloy elements can refine grains, reduce the overheating sensitivity and the tempering brittleness of the steel and improve the strength, but the plasticity and the toughness are reduced to a certain extent, and the addition of niobium in the common low alloy steel can improve the atmospheric corrosion resistance and the hydrogen, nitrogen and ammonia corrosion resistance at high temperature. Niobium can improve the weldability. The austenitic stainless steel is added with niobium to prevent intergranular corrosion, but when the content of niobium is too high, the hardness and toughness of the deformed steel are reduced, and the content of niobium in the conventional deformed steel is too high.
Disclosure of Invention
Aiming at the defects of the existing low-niobium deformed steel, the invention provides the low-niobium deformed steel and the production method thereof, which have the advantages of reducing the addition of the niobium element in the deformed steel, improving the strength, toughness and the like of the deformed steel and solve the problems in the background technology.
The invention provides the following technical scheme: the low-niobium deformed steel comprises the following chemical components in percentage by mass: c: (0.10-0.40%), Mn < 1.80%, P < 0.050 %, S < 0.050%, Si: (0.60-1.00%), Nb is less than or equal to 1.5%, and the balance is Fe.
Preferably, the low-niobium deformed steel comprises the following chemical components in percentage by mass: c: 0.19%, Mn: 0.8%, P: 0.045 %, S: 0.045%, Si: 0.52%, Nb: 0.2 percent and the balance of Fe.
Preferably, the surface of the low-niobium deformed steel bar is wrapped with a heat insulation layer.
Preferably, the outer part of the heat insulation layer on the low-niobium deformed steel is wrapped with a corrosion-proof layer.
A low-niobium deformed steel bar and a production method thereof comprise the following steps:
the first step is as follows: the preparation of all materials required for producing the deformed steel bar is complete;
the second step is that: feeding iron ore, coke and limestone which are raw materials required in the iron making process into a blast furnace for smelting, decomposing and melting the iron ore in the blast furnace to generate pig iron, and taking out the generated pig iron by workers;
the third step: the taken pig iron and the scrap steel are put into an electric arc furnace together for conversion, the pig iron is blown with oxygen and impurities are removed in the smelting process in the electric arc furnace, alloys such as silicon, manganese, ferroniobium and the like are added into the pig iron for alloying in the conversion process, the pig iron and the scrap steel are converted into molten steel together, and the generated molten steel is taken out;
the fourth step: the produced molten steel is refined in a ladle furnace, an LF refining method is generally adopted, an inclusion control box melts ferroalloy by using electric arc heating, and the components or the temperature in the molten steel are adjusted to improve the quality of the molten steel;
the fifth step: solidifying, cooling, drawing and cutting molten steel meeting the steel quality requirement into continuous casting billet with various lengths by a continuous casting machine;
and a sixth step: conveying the plate blank drawn out from the continuous casting machine to a hot rolling machine through different processing routes, heating to 1120-1150 ℃, conveying to a continuous small rolling machine for rolling at the temperature required by rolling, and cooling the blank as required in the rolling process;
the seventh step: under the rolling of a rolling mill, the billet is gradually thinned and is closer to the final diameter of a product, the billet is sent into a bar cooling bed for cooling, and a patterned roller is used on a final bar finished product rolling mill to produce deformed steel;
eighth step: and spraying heat insulation paint on the surface of the deformed steel bar by using spraying equipment, drying the paint sprayed on the surface of the deformed steel bar by using a blowing device, and spraying an anti-corrosion protective layer on the surface of the deformed steel bar by using another spraying equipment after the paint on the surface of the deformed steel bar is dried.
Preferably, the side length of the billet in the fifth step is generally between 130 and 160mm, the length is generally about 6 to 12 meters, and the single weight of the billet is 1.5 to 3 tons.
Compared with the existing low-niobium deformed steel, the invention has the following beneficial effects:
1. according to the low-niobium deformed steel bar and the production method thereof, a small amount of niobium element is added into the deformed steel bar, and the niobium element can produce fine niobium carbide in the deformed steel bar, so that the strength and the hardness of the deformed steel bar are improved, the deformed steel bar is convenient to use, and the service life of the deformed steel bar is prolonged.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The low-niobium deformed steel comprises the following chemical components in percentage by mass: c: (0.10-0.40%), Mn < 1.80%, P < 0.050 %, S < 0.050%, Si: (0.60-1.00%), Nb is less than or equal to 1.5%, and the balance is Fe.
The low-niobium deformed steel comprises the following chemical components in percentage by mass: c: 0.19%, Mn: 0.8%, P: 0.045 %, S: 0.045%, Si: 0.52%, Nb: 0.2 percent and the balance of Fe, the strength and the toughness of the deformed steel bar can be increased by adding 0.2 percent of niobium into the deformed steel bar, the deformed steel bar is convenient to use, the hardness of the deformed steel bar can be influenced by the high content of C in steel, and in order to obtain good weldability, the content of carbon is not more than 0, preferably 2 percent, so the content of the carbon is selected to be 0.19 percent in the document.
Wherein, the surface coating of low niobium screw-thread steel has the insulating layer, through the setting of insulating layer, can make the inside temperature of this screw-thread steel remain stable, prevents that the inside temperature of this screw-thread steel from differing too greatly with outside temperature, influences the life of this screw-thread steel, and the setting up of insulating layer makes this screw-thread steel have the function of fire prevention, the use of this screw-thread steel of being convenient for.
The outer wrapping of the heat insulation layer on the low-niobium deformed steel bar is provided with the anti-corrosion layer, the anti-corrosion layer can isolate the deformed steel bar from the outside through the anti-corrosion layer, impurities such as external dust are prevented from being adhered to the surface of the deformed steel bar, the deformed steel bar is prevented from being corroded, and the service life of the deformed steel bar is prolonged.
The low-niobium deformed steel bar and the production method thereof are characterized in that: the method comprises the following steps:
the first step is as follows: the preparation of all materials required for producing the deformed steel bar is complete;
the second step is that: feeding iron ore, coke and limestone which are raw materials required in the iron making process into a blast furnace for smelting, decomposing and melting the iron ore in the blast furnace to generate pig iron, and taking out the generated pig iron by workers;
the third step: the taken pig iron and the scrap steel are put into an electric arc furnace together for conversion, the pig iron is blown with oxygen and impurities are removed in the smelting process in the electric arc furnace, alloys such as silicon, manganese, ferroniobium and the like are added into the pig iron for alloying in the conversion process, the pig iron and the scrap steel are converted into molten steel together, and the generated molten steel is taken out;
the fourth step: the produced molten steel is refined in a ladle furnace, an LF refining method is generally adopted, an inclusion control box melts ferroalloy by using electric arc heating, and the components or the temperature in the molten steel are adjusted to improve the quality of the molten steel;
the fifth step: solidifying, cooling, drawing and cutting molten steel meeting the steel quality requirement into continuous casting billet with various lengths by a continuous casting machine;
and a sixth step: conveying the plate blank drawn out from the continuous casting machine to a hot rolling machine through different processing routes, heating to 1120-1150 ℃, conveying to a continuous small rolling machine for rolling at the temperature required by rolling, and cooling the blank as required in the rolling process;
the seventh step: under the rolling of a rolling mill, the billet is gradually thinned and is closer to the final diameter of a product, the billet is sent into a bar cooling bed for cooling, and a patterned roller is used on a final bar finished product rolling mill to produce deformed steel;
eighth step: and spraying heat insulation paint on the surface of the deformed steel bar by using spraying equipment, drying the paint sprayed on the surface of the deformed steel bar by using a blowing device, and spraying an anti-corrosion protective layer on the surface of the deformed steel bar by using another spraying equipment after the paint on the surface of the deformed steel bar is dried.
Wherein, the side length of the small square billet in the step five is generally between 130 and 160mm, the length is generally about 6 to 12 meters, and the single weight of the billet is 1.5 to 3 tons.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A low-niobium deformed steel bar is characterized in that: the low-niobium deformed steel comprises the following chemical components in percentage by mass: c: (0.10-0.40%), Mn < 1.80%, P < 0.050 %, S < 0.050%, Si: (0.60-1.00%), Nb is less than or equal to 1.5%, and the balance is Fe.
2. A low niobium deformed steel bar as claimed in claim 1, wherein: the low-niobium deformed steel comprises the following chemical components in percentage by mass: c: 0.19%, Mn: 0.8%, P: 0.045 %, S: 0.045%, Si: 0.52%, Nb: 0.2 percent and the balance of Fe.
3. A low niobium deformed steel bar as claimed in claim 1, wherein: and the surface of the low-niobium deformed steel is wrapped with a heat insulation layer.
4. A low niobium deformed steel bar as claimed in claim 3, wherein: and the outer part of the heat insulation layer on the low-niobium deformed steel is wrapped with an anti-corrosion layer.
5. The low-niobium deformed steel bar and the production method thereof are characterized in that: the method comprises the following steps:
the first step is as follows: the preparation of all materials required for producing the deformed steel bar is complete;
the second step is that: feeding iron ore, coke and limestone which are raw materials required in the iron making process into a blast furnace for smelting, decomposing and melting the iron ore in the blast furnace to generate pig iron, and taking out the generated pig iron by workers;
the third step: the taken pig iron and the scrap steel are put into an electric arc furnace together for conversion, the pig iron is blown with oxygen and impurities are removed in the smelting process in the electric arc furnace, alloys such as silicon, manganese, ferroniobium and the like are added into the pig iron for alloying in the conversion process, the pig iron and the scrap steel are converted into molten steel together, and the generated molten steel is taken out;
the fourth step: the produced molten steel is refined in a ladle furnace, an LF refining method is generally adopted, an inclusion control box melts ferroalloy by using electric arc heating, and the components or the temperature in the molten steel are adjusted to improve the quality of the molten steel;
the fifth step: solidifying, cooling, drawing and cutting molten steel meeting the steel quality requirement into continuous casting billet with various lengths by a continuous casting machine;
and a sixth step: conveying the plate blank drawn out from the continuous casting machine to a hot rolling machine through different processing routes, heating to 1120-1150 ℃, conveying to a continuous small rolling machine for rolling at the temperature required by rolling, and cooling the blank as required in the rolling process;
the seventh step: under the rolling of a rolling mill, the billet is gradually thinned and is closer to the final diameter of a product, the billet is sent into a bar cooling bed for cooling, and a patterned roller is used on a final bar finished product rolling mill to produce deformed steel;
eighth step: and spraying heat insulation paint on the surface of the deformed steel bar by using spraying equipment, drying the paint sprayed on the surface of the deformed steel bar by using a blowing device, and spraying an anti-corrosion protective layer on the surface of the deformed steel bar by using another spraying equipment after the paint on the surface of the deformed steel bar is dried.
6. A low niobium deformed steel bar as claimed in claim 5, wherein: the side length of the small square billet in the step five is generally between 130 and 160mm, the length is generally about 6 to 12 meters, and the single weight of the billet is 1.5 to 3 tons.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010788888.5A CN112080707A (en) | 2020-08-07 | 2020-08-07 | Low-niobium deformed steel bar and production method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010788888.5A CN112080707A (en) | 2020-08-07 | 2020-08-07 | Low-niobium deformed steel bar and production method thereof |
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| CN112080707A true CN112080707A (en) | 2020-12-15 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1982489A (en) * | 2006-02-11 | 2007-06-20 | 湖南华菱涟源钢铁有限公司 | Production of III threading reinforcing bar |
| CN101921954A (en) * | 2010-07-27 | 2010-12-22 | 福建三宝特钢有限公司 | Earthquake-resistant hot rolled ribbed steel bar and production process thereof |
| CN110373611A (en) * | 2019-08-28 | 2019-10-25 | 福建三宝钢铁有限公司 | One kind screw-thread steel containing Ti and preparation method thereof |
| JP2020002455A (en) * | 2018-07-02 | 2020-01-09 | 日本製鉄株式会社 | Steel bar or steel product, and manufacturing method therefor |
| CN110684931A (en) * | 2019-10-24 | 2020-01-14 | 柳州钢铁股份有限公司 | Control method for non-yield phenomenon of niobium microalloyed HRB400E hot-rolled ribbed steel bar |
-
2020
- 2020-08-07 CN CN202010788888.5A patent/CN112080707A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1982489A (en) * | 2006-02-11 | 2007-06-20 | 湖南华菱涟源钢铁有限公司 | Production of III threading reinforcing bar |
| CN101921954A (en) * | 2010-07-27 | 2010-12-22 | 福建三宝特钢有限公司 | Earthquake-resistant hot rolled ribbed steel bar and production process thereof |
| JP2020002455A (en) * | 2018-07-02 | 2020-01-09 | 日本製鉄株式会社 | Steel bar or steel product, and manufacturing method therefor |
| CN110373611A (en) * | 2019-08-28 | 2019-10-25 | 福建三宝钢铁有限公司 | One kind screw-thread steel containing Ti and preparation method thereof |
| CN110684931A (en) * | 2019-10-24 | 2020-01-14 | 柳州钢铁股份有限公司 | Control method for non-yield phenomenon of niobium microalloyed HRB400E hot-rolled ribbed steel bar |
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| 付上金: "《金属期货》", 30 June 2018, 中国宇航出版社 * |
| 吴润 等: "《钢铁质量及其构件失效分析》", 30 April 2018, 北京航空航天大学出版社 * |
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