CN113930655A - Method for producing high-strength weather-resistant 310B-shaped steel by using square billet with thickness of 280mm multiplied by 380mm - Google Patents
Method for producing high-strength weather-resistant 310B-shaped steel by using square billet with thickness of 280mm multiplied by 380mm Download PDFInfo
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- CN113930655A CN113930655A CN202111020925.9A CN202111020925A CN113930655A CN 113930655 A CN113930655 A CN 113930655A CN 202111020925 A CN202111020925 A CN 202111020925A CN 113930655 A CN113930655 A CN 113930655A
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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
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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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
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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 discloses a method for producing high-strength weather-resistant 310B-shaped steel by using a square billet with the thickness of 280mm multiplied by 380mm, wherein the steel-making process comprises molten iron desulphurization, converter, external refining and continuous casting; the converter tapping C is less than or equal to 0.10 percent, the tapping temperature is more than or equal to 1605 ℃, and the final slag alkalinity is controlled according to 3.0; the degree of superheat is less than or equal to 25 ℃; the drawing speed is less than or equal to 0.65m/min, secondary cooling water is cooled in a weak cooling mode, and the specific water amount is controlled to be 0.18-0.21L/Kg; the rolling process comprises the following steps: the heating time is more than or equal to 4 hours, the temperature of the preheating section is less than or equal to 800 ℃, and the soaking temperature is 1120-1180 ℃; the initial rolling temperature is less than or equal to 1150 ℃; the finish rolling temperature is less than or equal to 860 ℃, the section with the specification of 280mm multiplied by 380mm is adopted to produce the 310B-shaped steel, the surface quality of the casting blank is good, the product yield is improved, and the heating time and the surface burning loss rate of the casting blank are reduced.
Description
Technical Field
The invention relates to the field of material metallurgy, in particular to a method for producing high-strength weather-resistant 310B-shaped steel by using a square billet with the thickness of 280mm multiplied by 380 mm.
Background
Along with the driving of economic development of China to railway transportation, the steel for railways is continuously developed, and YQ450NQR1 high-strength high-weather-resistance 310B-shaped steel is used as an important variety of steel for railways, has the performance characteristics of high strength, corrosion resistance and the like, is special section steel for manufacturing middle beams of train carriages, and is an important guarantee for heavy load of trains. From the appearance, the 310Z-shaped steel belongs to a large-scale asymmetric section profile, although the section shape is simple, the upper leg and the lower leg are different in length and thickness, so that severe uneven deformation exists in the rolling process, a rolled piece tends to bend in the direction of the short leg, and meanwhile, the rolled piece tends to twist relative to the longitudinal axis of the rolled piece, the rolling precision control difficulty is high, and the increase of the rolling difficulty further provides extremely high requirements for a large square billet casting blank quality control window.
At present, the 310B-shaped steel rolled by domestic iron and steel works generally uses a 320mm multiplied by 410mm bloom section, and the use of the bloom causes the following problems.
With the development of the market, the current 310B-shaped steel ordered batch is small and is lower than the minimum yield of a casting machine, the production of the casting machine cannot be supported sufficiently, and the fund overstock of blank preparation is serious.
The fluctuation of the surface quality of the blank directly influences the quality and the yield of finished products, and the working efficiency is low.
The size of the section of the blank is large, the time of the heating procedure is long, and the contradiction exists between the control of the internal and external temperature difference and the control of the oxidation burning loss.
The rail beam cogging procedure has many passes, the guide control function is not obvious, the size fluctuation of the head and the tail is large, the cutting loss is influenced, and the yield is not favorably improved.
The difference between the same strip size and the different strip size is large, the difficulty is more when the user uses the device, and the difficulty in batching is large.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a method for producing high-strength weather-resistant 310B-shaped steel by using a square billet with the thickness of 280mm multiplied by 380 mm.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a method for producing high-strength weather-resistant 310B-shaped steel by using a square billet with the thickness of 280mm multiplied by 380mm, and the steel-making process comprises molten iron desulphurization, converter, external refining and continuous casting;
the converter tapping C is less than or equal to 0.10 percent, the tapping temperature is more than or equal to 1605 ℃, and the final slag alkalinity is controlled according to 3.0;
the degree of superheat is less than or equal to 25 ℃;
the drawing speed is less than or equal to 0.65m/min, secondary cooling water is cooled in a weak cooling mode, and the specific water amount is controlled to be 0.18-0.21L/Kg;
the rolling process comprises the following steps:
the heating time is more than or equal to 4 hours, the temperature of the preheating section is less than or equal to 800 ℃, and the soaking temperature is 1120-1180 ℃;
the initial rolling temperature is less than or equal to 1150 ℃;
the reduction system of the section of 280mm multiplied by 380mm is as follows:
| number of holes | Roll gap (mm) |
| 1 | 110 |
| 1 | 50 |
| 1 | 10 |
| 2 | 220 |
| 3 | 54 |
| 3 | 20 |
| 3 | 5 |
The finishing temperature is less than or equal to 860 ℃.
Further, the chemical component range of the 310B-shaped steel in percentage by mass is C: 0.10-0.14%, Si 0.40-0.50%, Mn: 1.30-1.40%, P is less than or equal to 0.015%, S: less than or equal to 0.010 percent, Cr: 0.24-0.28%, Cu: 0.25% -0.30%, Ni: 0.25% -0.30%, V: 0.10-0.13%, Al: 0.020% -0.040%, RE: 0.0010-0.0020%, N: 0.009-0.013%, and the balance of Fe and residual elements.
Further, the chemical component range of the 310B-shaped steel in percentage by mass is C: 0.13%, Si 0.45%, Mn: 1.34%, P: 0.012%, S: 0.006%, Cr: 0.26%, Cu: 0.28%, Ni: 0.27%, V: 0.10%, Al: 0.030%, RE: 0.0016%, N: 0.011 percent, and the balance of Fe and residual elements.
Further, the chemical component range of the 310B-shaped steel in percentage by mass is C: 0.12%, Si 0.47%, Mn: 1.36%, P: 0.012%, S: 0.005%, Cr: 0.25%, Cu: 0.27%, Ni: 0.26%, V: 0.11%, Al: 0.040%, RE: 0.0015%, N: 0.010% and the balance of Fe and residual elements.
Compared with the prior art, the invention has the beneficial technical effects that:
the section with the specification of 280mm multiplied by 380mm is adopted to produce the 310B-shaped steel, the surface quality of a casting blank is good, and the product yield is improved.
The heating time of the casting blank and the surface burning loss rate are reduced.
The rolling piece can be well controlled to swing in the guide device, the size precision of the 310Z-shaped steel is improved, and the product yield is improved.
Detailed Description
The chemical composition range of the 310B-shaped steel is C: 0.10-0.14%, Si 0.40-0.50%, Mn: 1.30-1.40%, P is less than or equal to 0.015%, S: less than or equal to 0.010 percent, Cr: 0.24-0.28%, Cu: 0.25% -0.30%, Ni: 0.25% -0.30%, V: 0.10-0.13%, Al: 0.020% -0.040%, RE: 0.0010-0.0020%, N: 0.009-0.013%, and the balance of Fe and residual elements.
As the 310Z-shaped steel is rolled by adopting the smaller section of 280mm multiplied by 380mm, the compression ratio is reduced, and the content of C is controlled between 0.10 percent and 0.14 percent.
Si can improve the corrosion resistance of steel, and is often added into stainless steel, low alloy steel and corrosion resistant alloy to improve the corrosion resistance of the alloy, so that the alloy has the performances of resisting chloride stress corrosion cracking, pitting corrosion, hot concentrated nitric acid corrosion, oxidation and seawater corrosion, and the like, and the content of Si is controlled to be 0.40-0.50 percent of that of Si.
V: both V and C, O, N have strong bonding ability and form extremely stable compounds with them, thus refining grains and reducing heat sensitivity and temper brittleness of steel. Can obviously improve the welding performance of common low alloy steel. The content of the V element in the steel is controlled to be 0.10-0.13%.
N: n, V, Ti and the like are easy to produce nitride or nitrogen carbide, the crystal grains are refined, and the strength and toughness of the steel are improved through precipitation strengthening; on the other hand, if the mass percentage of N in the steel is too high, void defects are likely to occur, and the content of N element in the steel of the present invention is controlled to 0.009% to 0.013%.
RE is known to be a clean and significant deterioration in steel. The cleanliness of steel is continuously improved, and the microalloying effect of rare earth elements is increasingly prominent. The microalloying of the rare earth comprises the solid solution strengthening of trace rare earth elements, the interaction of the rare earth elements with other solute elements and compounds, the existence state (atoms, inclusions or compounds), the size, the shape and the distribution of the rare earth elements, particularly the segregation at grain boundaries and the influence of the rare earth on the steel surface and the matrix structure. The RE element content of the steel is controlled to be 0.0010-0.0020 percent.
The steel-making process comprises the following steps:
molten iron desulfurization, converter, external refining and continuous casting
The converter tapping C is less than or equal to 0.10 percent, the tapping temperature is more than or equal to 1605 ℃, and the final slag alkalinity is controlled according to 3.0.
The degree of superheat is less than or equal to 25 ℃.
The drawing speed is less than or equal to 0.65m/min, the secondary cooling water is cooled by adopting a weak cooling mode, and the specific water amount is controlled to be 0.18-0.21L/Kg.
The rolling process comprises the following steps:
the heating time is more than or equal to 4 hours, the temperature of the preheating section is less than or equal to 800 ℃, and the soaking temperature is 1120-1180 ℃.
The initial rolling temperature is less than or equal to 1150 ℃.
The reduction system of the section of 280mm multiplied by 380mm is as follows:
| number of holes | Roll gap (mm) |
| 1 | 110 |
| 1 | 50 |
| 1 | 10 |
| 2 | 220 |
| 3 | 54 |
| 3 | 20 |
| 3 | 5 |
The finishing temperature is less than or equal to 860 ℃.
The invention is further described below:
table 1 is a table listing the chemical components and weight percent content of each example of the present invention,
table 2 is a table of the results of mechanical and toughness tests of the examples of the present invention.
TABLE 1 chemical composition and weight percentage of the examples
Table 2 shows the results of mechanical measurements and the like of the examples
Meanwhile, the embodiment adopts the 280mm multiplied by 380mm section to produce the 310B-shaped steel, so that the surface quality of the casting blank is good, the product yield is improved, and the heating time and the surface burning loss rate of the casting blank are effectively reduced. The rolling piece can be well controlled to swing in the guide device, the size precision of the 310Z-shaped steel is improved, and the product yield is improved.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (4)
1. A method for producing high-strength weather-resistant 310B steel by using a 280mm multiplied by 380mm square billet is characterized in that the steel-making process comprises molten iron desulphurization, converter, external refining and continuous casting;
the converter tapping C is less than or equal to 0.10 percent, the tapping temperature is more than or equal to 1605 ℃, and the final slag alkalinity is controlled according to 3.0;
the degree of superheat is less than or equal to 25 ℃;
the drawing speed is less than or equal to 0.65m/min, secondary cooling water is cooled in a weak cooling mode, and the specific water amount is controlled to be 0.18-0.21L/Kg;
the rolling process comprises the following steps:
the heating time is more than or equal to 4 hours, the temperature of the preheating section is less than or equal to 800 ℃, and the soaking temperature is 1120-1180 ℃;
the initial rolling temperature is less than or equal to 1150 ℃;
the finishing temperature is less than or equal to 860 ℃.
2. The method for producing the high-strength weather-resistant 310B-steel by using the 280mm x 380mm square billet according to the claim 1, wherein the chemical composition range of the 310B-steel in percentage by mass is C: 0.10-0.14%, Si 0.40-0.50%, Mn: 1.30-1.40%, P is less than or equal to 0.015%, S: less than or equal to 0.010 percent, Cr: 0.24-0.28%, Cu: 0.25% -0.30%, Ni: 0.25% -0.30%, V: 0.10-0.13%, Al: 0.020% -0.040%, RE: 0.0010-0.0020%, N: 0.009-0.013%, and the balance of Fe and residual elements.
3. The method for producing the high-strength weather-resistant 310B-steel by using the 280mm x 380mm square billet according to the claim 1, wherein the chemical composition range of the 310B-steel in percentage by mass is C: 0.13%, Si 0.45%, Mn: 1.34%, P: 0.012%, S: 0.006%, Cr: 0.26%, Cu: 0.28%, Ni: 0.27%, V: 0.10%, Al: 0.030%, RE: 0.0016%, N: 0.011 percent, and the balance of Fe and residual elements.
4. The method for producing the high-strength weather-resistant 310B-steel by using the 280mm x 380mm square billet according to the claim 1, wherein the chemical composition range of the 310B-steel in percentage by mass is C: 0.12%, Si 0.47%, Mn: 1.36%, P: 0.012%, S: 0.005%, Cr: 0.25%, Cu: 0.27%, Ni: 0.26%, V: 0.11%, Al: 0.040%, RE: 0.0015%, N: 0.010% and the balance of Fe and residual elements.
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|---|---|---|---|
| CN202111020925.9A CN113930655A (en) | 2021-09-01 | 2021-09-01 | Method for producing high-strength weather-resistant 310B-shaped steel by using square billet with thickness of 280mm multiplied by 380mm |
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|---|---|---|---|
| CN202111020925.9A CN113930655A (en) | 2021-09-01 | 2021-09-01 | Method for producing high-strength weather-resistant 310B-shaped steel by using square billet with thickness of 280mm multiplied by 380mm |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116377350A (en) * | 2023-02-01 | 2023-07-04 | 包头钢铁（集团）有限责任公司 | Preparation method of high-strength, low-temperature-resistant and sulfuric acid corrosion-resistant S450AW steel for railway freight car |
| CN116657035A (en) * | 2023-05-11 | 2023-08-29 | 包头钢铁（集团）有限责任公司 | Production and preparation method of high-strength low-temperature-resistant YQ500NQR1 steel for railway freight car |
Citations (3)
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| CN101760704A (en) * | 2009-12-24 | 2010-06-30 | 马鞍山钢铁股份有限公司 | Economical high-strength high-weatherability hot-rolled H beam steel containing vanadium and nitrogen and rolling method thereof |
| 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 |
| CN110846578A (en) * | 2019-11-25 | 2020-02-28 | 包头钢铁（集团）有限责任公司 | High-strength weather-resistant hot-rolled 310B-shaped steel with low surface crack rate and preparation method thereof |
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2021
- 2021-09-01 CN CN202111020925.9A patent/CN113930655A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101760704A (en) * | 2009-12-24 | 2010-06-30 | 马鞍山钢铁股份有限公司 | Economical high-strength high-weatherability hot-rolled H beam steel containing vanadium and nitrogen and rolling method thereof |
| 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 |
| CN110846578A (en) * | 2019-11-25 | 2020-02-28 | 包头钢铁（集团）有限责任公司 | High-strength weather-resistant hot-rolled 310B-shaped steel with low surface crack rate and preparation method thereof |
Non-Patent Citations (1)
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| 罗莉萍等: "《炼钢生产》", 29 February 2016 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116377350A (en) * | 2023-02-01 | 2023-07-04 | 包头钢铁（集团）有限责任公司 | Preparation method of high-strength, low-temperature-resistant and sulfuric acid corrosion-resistant S450AW steel for railway freight car |
| CN116657035A (en) * | 2023-05-11 | 2023-08-29 | 包头钢铁（集团）有限责任公司 | Production and preparation method of high-strength low-temperature-resistant YQ500NQR1 steel for railway freight car |
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