CN115058649B - Economical hot-rolled steel for U-shaped sheet pile and production method - Google Patents
Economical hot-rolled steel for U-shaped sheet pile and production method Download PDFInfo
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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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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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
- C22C38/04—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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- 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
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Abstract
The economical hot-rolled U-shaped sheet pile steel comprises the following components in percentage by weight: c:0.24 to 0.30 percent of Si:0.20 to 0.30 percent of Mn:0.8 to 1.30 percent of Nb:0.007 to 0.011 percent, P is less than or equal to 0.035 percent, and S is less than or equal to 0.035 percent; the production method comprises the following steps: pouring into a converter after smelting; heating a casting blank; descaling with high-pressure water; carrying out two-stage hot rolling; the post-process is conventionally performed. The invention has tensile strength not lower than 630MPa, ferrite grain size not lower than 8 grade, use times not lower than 15 times, no need of desulfurizing molten iron, no need of electromagnetic stirring during casting, and relatively reduced production cost by at least 10%.
Description
Technical Field
The invention relates to steel for a hot-rolled U-shaped steel sheet pile and a production method thereof, and in particular belongs to economical steel for a hot-rolled U-shaped steel sheet pile and a production method thereof.
Background
The steel sheet pile is a profile steel with a locking notch, and is suitable for water seepage prevention engineering such as embankment reinforcement, closure cofferdam and the like, retaining wall, building foundation pit support and the like. As a construction material for important engineering construction in the fields of modern foundation and underground engineering, the steel sheet pile can meet the construction requirements of a plurality of engineering fields such as traditional water conservancy, civil engineering, road traffic engineering, environmental pollution remediation, sudden disaster control and the like. The steel sheet pile products are divided into two types of cold-formed thin-wall steel sheet piles and hot-rolled steel sheet piles according to the production process. The cold-formed steel sheet pile is formed by adopting thinner plates (the common thickness is 8-14 mm) and processing the plates by a cold-forming machine set. However, the thickness of each part of the pile body is the same due to the simple processing mode, and the section size cannot be optimized, so that the steel consumption is increased; the shape of the locking port is difficult to control, the joint is not tightly buckled, and water can not be stopped; limited by the capacity of cold bending processing equipment, only products with low strength grade and single thickness of steel grades can be produced; and the stress generated in the cold bending process is larger, the pile body is easy to tear in use, and the application has larger limitation. The hot rolled steel sheet pile is formed by a cogging mill, a rail beam rolling mill or a universal rolling mill through high-temperature rolling, and has the advantages of standard size, excellent performance, reasonable section, high quality and the like. The hot rolled steel sheet pile is classified from the sectional shape into basic types such as U-shape, Z-shape, and straight-line type, and combinations thereof. Compared with other materials adopted in engineering construction, the hot rolled steel sheet pile is an excellent environment-friendly building foundation construction material. The water-stopping agent has the advantages of high strength, light weight, good water stopping performance and the like, has strong durability, can be used for 20-50 years, can be reused and is generally used for 5-10 times.
At present, the most commonly used steel sheet pile is generally Q390P, and because the carbon content of Q390P produced by national standards is required to be less than or equal to 0.20%, more expensive alloy such as manganese of at most 1.70%, vanadium of 0.2%, niobium of 0.06% and titanium of 0.2% is required to be added to achieve the expected mechanical properties. This tends to increase not only the production cost but also the difficulty of production control. Therefore, for cost control, common manufacturers control the carbon content of the components to be about 0.18%, manganese to be about 1.5%, vanadium to be about 0.04%, and niobium to be about 0.02% when Q390P is produced. However, due to the low carbon content, even if a small amount of alloy elements are added, the tensile strength of the steel sheet pile finished product is generally low and is generally below 550 MPa. Finally, the steel sheet pile is generally used for less than 10 times, and the recycling rate is not high. Further, the alloy cost is still high due to the addition of about 1.5% manganese and about 0.04% vanadium, and about 0.02% niobium. And (3) searching:
the document with the Chinese patent application number of CN200810197630.7 discloses a hot-rolled U-shaped steel sheet pile and a microalloying production method thereof, wherein the steel comprises the following chemical components in percentage by weight: 0.12 to 0.26 percent of C, 0.6 to 1.8 percent of Mn, 0.25 to 0.60 percent of Si, less than or equal to 0.020 percent of P, less than or equal to 0.020 percent of S, 0.010 to 0.050 percent of Als, 0.01 to 0.20 percent of V and less than or equal to 0.005 percent of N. The preferable range is as follows: the carbon content is mainly 0.17-0.22%, the aluminum content is 0.01-0.04%, and the vanadium content is 0.03-0.10%. Because of the addition of aluminum, calcium treatment is needed, and the castability is poor. Meanwhile, the vanadium content is higher, and the overall manufacturing cost is higher. And the tensile strength of the product is lower than 610 MPa.
The document of Chinese patent application No. CN201010147686.9 discloses steel for hot-rolled U-shaped steel sheet piles resistant to low-temperature impact and a production method thereof, wherein the steel comprises the following components in percentage by weight: 0.15 to 0.20 percent of C, 0.8 to 1.5 percent of Mn, 0.26 to 0.46 percent of Si, less than or equal to 0.02 percent of P, less than or equal to 0.02 percent of S, 0.015 to 0.05 percent of Als, 0.015 to 0.035 percent of Nb, 0.0005 to 0.0012 percent of B, 0.001 to 0.005 percent of Ca, less than or equal to 0.005 percent of [ O ] and less than or equal to 0.004 percent of N; the steps are as follows: smelting; refining in a converter; vacuum deoxidation treatment, wherein the total oxygen content in molten steel is controlled to be less than or equal to 0.005%; continuous casting; heating the casting blank to 1180-1280 ℃; and rolling in two stages in an austenite recrystallization region and an unrecrystallized region. Because of the addition of aluminum, calcium treatment is needed, and the castability is poor. Meanwhile, elements such as niobium, boron and the like are added, vacuum treatment is also needed, the production difficulty is high, and the overall manufacturing cost is high.
The document of Chinese patent application No. CN201010167972.1 discloses steel for hot-rolled U-shaped steel sheet pile with acid soil corrosion resistance and a production method thereof, wherein the steel comprises the following components in percentage by weight: 0.13 to 0.28 percent of C, 0.6 to 1.5 percent of Mn, 0.10 to 0.6 percent of Si, less than or equal to 0.020 percent of S, less than or equal to 0.02 percent of P, 0.5 to 1.2 percent of Cr, 0.15 to 0.3 percent of Mo, and the balance of Fe and unavoidable impurities; the method comprises the following steps: smelting: adopting [ Al ] < 0.005% to deoxidize, adding lime at one time when discharging from the furnace, and ensuring the thickness of the slag layer to be 6-15mm; continuous casting: the casting temperature is 1570-1580 ℃, the superheat degree is 15-35 ℃, the pulling speed is 1.0-2.0 m/min, and the thickness of the covering slag is 2-5 mm; preheating a continuous casting blank to 300 ℃ and then heating to 1150-1300 ℃; preserving heat for 10-30 minutes; rolling: the initial rolling temperature is 1100-1250 ℃ and the final rolling temperature is 850-920 ℃. Because of the high chromium content and noble metal molybdenum, the production difficulty is high and the overall manufacturing cost is high.
The document of Chinese patent application No. CN201010147773.4 discloses steel for hot rolled U-shaped steel sheet piles with yield ratio less than or equal to 0.8 and a production method thereof, wherein the steel comprises the following chemical components in percentage by weight: 0.12 to 0.20 percent of C, 1.0 to 1.8 percent of Mn, 0.22 to 0.5 percent of Si, less than or equal to 0.02 percent of P, less than or equal to 0.02 percent of S, 0.01 to 006 percent of Als, 0.02 to 0.18 percent of V, 0.001 to 0.008 percent of Ca, and the balance of Fe and unavoidable impurities, and the production method comprises the following steps: smelting; refining in a converter; al wire is added according to 3-5 m/ton steel 5-10 minutes before finishing converter refining; adding Si-Ca wires according to 3-10 m/ton steel 2.5-7 minutes before finishing converter refining; continuous casting is carried out; heating the continuous casting billet to 1150-1250 ℃; rolling is performed. Because of the addition of aluminum, calcium treatment is needed, and the castability is poor.
The document of Chinese patent application No. CN201010168491.2 discloses steel for hot-rolled U-shaped steel sheet piles resistant to alkali soil corrosion and a production method thereof, wherein the steel comprises the following chemical components in percentage by weight: 0.15 to 0.26 percent of C, 0.8 to 1.4 percent of Mn, 0.10 to 0.6 percent of Si, less than or equal to 0.020 percent of S, less than or equal to 0.02 percent of P, 0.2 to 0.5 percent of Cu, 0.1 to 0.25 percent of Ni, and the balance of Fe and unavoidable impurities; the method comprises the following steps: smelting and refining in a converter: controlling the final slag alkalinity R to be 2-5; continuous casting: controlling the depth of the long nozzle inserted into the crystallizer to be 100-300 mm; heating the continuous casting billet to 1050-1150 ℃; rolling: the initial rolling temperature is 1020-1100 ℃ and the copper melting point temperature is 1083 ℃ or lower. Because of the copper and noble metal nickel with higher addition content, the production difficulty is higher, and the overall manufacturing cost is higher.
The document of Chinese patent application No. CN201010147762.6 discloses a hot rolled U-shaped steel sheet pile steel with tensile strength more than or equal to 600MPa and a production method thereof, wherein the steel comprises the following components in percentage by weight: 0.31 to 0.50 percent of C, 1.0 to 2.0 percent of Mn, 0.10 to 0.60 percent of Si, less than or equal to 0.02 percent of P, less than or equal to 0.02 percent of S, 0.01 to 0.06 percent of TAl, 0.015 to 0.035 percent of Nb and 0.005 to 0.030 percent of Ti; the method comprises the following steps: smelting; refining in a converter; adding Si-Ca wire 5-10 minutes before finishing converter refining; continuous casting: controlling casting temperature and stirring, and controlling the end face size of the continuous casting blank; heating the continuous casting billet; rolling: the compression ratio is controlled to be 18-40, and the density of the steel is controlled to be not lower than 98%. The carbon content is higher, aluminum is added, calcium treatment is needed, and the castability is poor. In addition, niobium and titanium alloy elements are added at the same time, so that the control difficulty is high and the production cost is high.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the economical steel for the hot-rolled U-shaped steel sheet pile, which has the tensile strength of not less than 630MPa, ferrite grain size of not less than 8 levels, use times of not less than 15 times, simple process and production cost which can be reduced by at least 10 percent compared with the prior art, and the production method.
Measures for achieving the above object:
the economical hot-rolled U-shaped sheet pile steel comprises the following components in percentage by weight: c:0.24 to 0.30 percent of Si:0.20 to 0.30 percent of Mn:0.8 to 1.30 percent of Nb:0.007 to 0.011 percent, less than or equal to 0.035 percent of P, less than or equal to 0.035 percent of S, and the balance of Fe and unavoidable impurities.
Preferably: the weight percentage content of C is 0.26-0.28%.
Preferably: the weight percentage content of Nb is 0.008-0.010%.
Preferably: the weight percentage content of Mn is 0.85-1.15%.
The method for producing the economical hot-rolled U-shaped sheet pile steel comprises the following steps:
1) Pouring into a blank after converter smelting, and adopting a large scrap ratio mode; the tapping temperature of the converter is controlled to be not lower than 1600 ℃;
deoxidizing and alloying by argon blowing refining, wherein the argon blowing refining time is controlled to be 18-22 min; the width of the casting blank is not less than 400mm; the superheat degree is controlled at 15-25 ℃, and the pulling speed is controlled at 0.5-0.7 m/min;
2) Heating a casting blank, controlling the temperature of the casting blank entering a furnace to be not lower than 400 ℃, and controlling the heating temperature of the casting blank to be 1150-1250 ℃;
3) Performing high-pressure water descaling, wherein the pressure is controlled to be 16-25 MPa;
4) Performing two-stage hot rolling, and controlling the final rolling temperature to be 750-850 ℃;
5) The post-process is conventionally performed.
The function and mechanism of each metal element and main process in the invention
C is an effective strengthening element in steel, and in addition to solid solution strengthening, it forms nano-sized second phase precipitation particles with micro-alloying elements such as Ti and Nb, and plays roles of precipitation strengthening and refining structure, which is also a method conventionally used for improving strength in general steel. As the most economical strengthening element, the invention designs that the content of C is more than or equal to 0.24 percent, and the weight percentage content of C is preferably 0.26 to 0.28 percent; however, too much C can form more carbide in the steel, so that the toughness and the formability of the material are reduced, and the welding performance of the steel is reduced, so that the C content is less than or equal to 0.30 percent.
Si is a deoxidizing element commonly used in steel, has solid solution strengthening effect on steel, and can also improve the yield strength and yield ratio of the material. However, a higher Si content reduces the weldability of the material, resulting in deterioration of toughness of the weld heat affected zone, and thus Si content in the range of 0.20 to 0.30% is designed.
Mn is an important strengthening element in steel, and has the function of solid solution strengthening. The brittleness of the steel caused by sulfur can be eliminated or reduced by containing a certain amount of manganese. The supercooling austenite transformation temperature can be reduced, the ferrite transformation temperature can be reduced, the tissue refinement is facilitated, and the strength and toughness of the material are improved. However, excessive Mn content can significantly inhibit ferrite transformation, and the transformation of the structure into bainite, so that the plasticity and cold forming performance of the material are reduced. The invention is therefore designed to have a Mn content of 0.8-1.3%, preferably a Mn content of 0.85-1.15% by weight.
Nb is also a strong nitrogen carbide forming element, and can form NbC and Nb (CN) carbide particles to produce precipitation strengthening. Improving the strength without reducing the low temperature impact toughness of the steel. However, niobium reduces the high-temperature thermoplastic properties of the steel, and thus increases the hot cracking tendency of the niobium-containing cast slab, so that the content is not excessively high. While niobium is a noble metal. The present invention is therefore designed to have a Nb content of 0.007-0.011%, preferably 0.008-0.010% by weight Nb.
P, S is a common harmful impurity element in steel, and has adverse effects on low-temperature toughness, welding performance, cold forming performance and the like, so the P, S content is required to be less than or equal to 0.035%.
The argon blowing refining time is controlled to be 18-22 min, so that the uniformity of the temperature and components of molten steel can be ensured due to a certain argon blowing refining time, and the heating operation of an LF furnace due to the large temperature drop of molten steel caused by long-time refining is avoided.
The casting width of the invention is not less than 400mm, and the maximum carbon content of the steel grade is only 0.3 percent, so that the carbon segregation can be ensured by controlling the superheat degree and the drawing speed matched with the section, and the required grain size can be obtained by controlling the rolling temperature and cooling in the aspect of the grain size of the finished product.
The invention controls the superheat degree at 15-25 ℃, and is beneficial to controlling the carbon segregation of casting blank and the like as the temperature range not only satisfies the smooth proceeding of molten steel continuous casting.
The invention heats the casting blank, controls the temperature of the casting blank in the furnace to be not lower than 400 ℃ and controls the heating temperature to be 1150-1250 ℃, and can be realized by adopting simple heat preservation measures as a certain temperature of the casting blank in the furnace can improve the heating quality and reduce the heating time and the fuel consumption. The heating temperature is controlled to meet the rolling requirement, and adverse effects of energy consumption increase, finished product surface decarburization and the like caused by high temperature are avoided.
The final rolling temperature is controlled to be 750-850 ℃, and the temperature is still in the austenite range, so that the influence of two-phase rolling on the performance can be avoided, and the temperature is lower, thereby being beneficial to improving the final mechanical property of the material.
Compared with the prior art, the invention has the advantages that the tensile strength is not lower than 630MPa, the ferrite grain size is not lower than 8 levels, the use times are not lower than 15 times, the desulfurization of molten iron is not needed, the electromagnetic stirring is not needed during casting, and the production cost can be reduced by at least 10 percent relatively.
Detailed Description
The present invention will be described in detail below:
table 1 is a listing of chemical components of each example and comparative example of the present invention;
table 2 is a list of the main process parameters for each example and comparative example of the present invention;
table 3 shows a list of performance tests for each example and comparative example of the present invention.
The embodiments of the invention are produced according to the following steps:
1) Pouring into a blank after converter smelting, and adopting a large scrap ratio mode; the tapping temperature of the converter is controlled to be not lower than 1600 ℃; deoxidizing and alloying by argon blowing refining, wherein the argon blowing refining time is controlled to be 18-22 min; the width of the casting blank is not less than 400mm; the superheat degree is controlled at 15-25 ℃, and the pulling speed is controlled at 0.5-0.7 m/min;
2) Heating a casting blank, controlling the temperature of the casting blank entering a furnace to be not lower than 400 ℃, and controlling the heating temperature of the casting blank to be 1150-1250 ℃;
3) Performing high-pressure water descaling, wherein the pressure is controlled to be 16-25 MPa;
4) Performing two-stage hot rolling, and controlling the final rolling temperature to be 750-850 ℃;
5) The post-process is conventionally performed.
TABLE 1 chemical composition (wt%) of each example and comparative example of the present invention
TABLE 2 Main production Process parameters for examples and comparative examples of the present invention
TABLE 3 product Performance and use List for the examples and comparative examples of the invention
As can be seen from Table 3, the yield strength and tensile strength of the embodiments of the present invention are significantly higher than those of comparative example Q390P produced by national standards, but the elongation thereof is not reduced much, and the number of recycling times is significantly higher than that of national standard Q390P as seen in tracking trial at the user. In addition, the manufacturing cost of steelmaking and rolling of the invention can be reduced by not less than 150 yuan/ton of steel, namely not less than 10 percent.
This embodiment is merely a best example and is not intended to limit the implementation of the technical solution of the present invention.
Claims (1)
1. A method for producing economical hot-rolled U-shaped sheet pile steel comprises the following steps:
1) Pouring into a blank after converter smelting, and adopting a large scrap ratio mode; the tapping temperature of the converter is controlled to be not lower than 1600 ℃; deoxidizing and alloying by argon blowing refining, wherein the argon blowing refining time is controlled to be 18-22 min; the width of the casting blank is not less than 400mm; the superheat degree is controlled at 15-25 ℃, and the pulling speed is controlled at 0.5-0.7 m/min;
2) Heating a casting blank, controlling the temperature of the casting blank entering a furnace to be not lower than 400 ℃, and controlling the heating temperature of the casting blank to be 1150-1250 ℃;
3) Performing high-pressure water descaling, wherein the pressure is controlled to be 16-25 MPa;
4) Performing two-stage hot rolling, and controlling the final rolling temperature to be 750-811 ℃;
5) Carrying out a post-process conventionally;
the economical hot-rolled U-shaped sheet pile steel comprises the following components in percentage by weight: c:0.295 to 0.30 percent of Si:0.20 to 0.30 percent of Mn:0.8 to 1.30 percent of Nb:0.007 to 0.011 percent, less than or equal to 0.035 percent of P, less than or equal to 0.035 percent of S, and the balance of Fe and unavoidable impurities.
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| CN202210700589.0A CN115058649B (en) | 2022-06-20 | 2022-06-20 | Economical hot-rolled steel for U-shaped sheet pile and production method |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007197801A (en) * | 2006-01-30 | 2007-08-09 | Jfe Steel Kk | Hot-rolled non-thermally refined bar steel having excellent toughness and manufacturing method therefor |
| CN101838773A (en) * | 2010-04-30 | 2010-09-22 | 武汉钢铁(集团)公司 | Steel for acid soil corrosion-resistant hot rolling U-shaped steel sheet pile and production method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007197801A (en) * | 2006-01-30 | 2007-08-09 | Jfe Steel Kk | Hot-rolled non-thermally refined bar steel having excellent toughness and manufacturing method therefor |
| CN101838773A (en) * | 2010-04-30 | 2010-09-22 | 武汉钢铁(集团)公司 | Steel for acid soil corrosion-resistant hot rolling U-shaped steel sheet pile and production method thereof |
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