CN115058649A - Economical steel for hot-rolled U-shaped sheet pile and production method - Google Patents
Economical steel for hot-rolled 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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- 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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- 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%, Si: 0.20 to 0.30%, Mn: 0.8 to 1.30%, Nb: 0.007-0.011 percent, less than or equal to 0.035 percent of P and less than or equal to 0.035 percent of S; the production method comprises the following steps: pouring after smelting in a converter; heating a casting blank; descaling by high-pressure water; carrying out two-stage hot rolling; and conventionally performing post-processing. The invention has the tensile strength of not less than 630MPa, the ferrite grain size of not less than 8 grade, the use times of not less than 15 times, the molten iron desulphurization is not needed, the electromagnetic stirring is not needed during the pouring, and the production cost can be relatively reduced by at least 10 percent.
Description
Technical Field
The invention relates to steel for a hot-rolled U-shaped steel sheet pile and a production method, and particularly belongs to economical steel for a hot-rolled U-shaped steel sheet pile and a production method.
Background
The steel sheet pile is a section steel with a locking notch, and is suitable for watertight projects such as dyke reinforcement and closure cofferdams and structural foundation projects such as retaining walls, building foundation pit support and the like. As a construction material for important engineering construction in the fields of modern foundations 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 product is divided into two types of cold-bending thin-wall steel sheet piles and hot-rolled steel sheet piles according to the production process. The cold-bending steel sheet pile is formed by processing a thin plate (the common thickness is 8-14 mm) by a cold-bending forming unit. However, the processing mode is simple and crude, the thickness of each part of the pile body is the same, and the section size cannot be optimized, so that the steel consumption is increased; the shape of the fore shaft part is difficult to control, the buckle at the joint is not tight, and water cannot be stopped; limited by the capability of cold-bending processing equipment, only products with low steel strength grade and thinner thickness can be produced; and the stress generated in the cold bending process is large, the pile body is easy to tear in use, and the application has large limitation. The hot-rolled steel sheet pile is formed by a cogging mill and 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 divided from the section shape, and has basic types such as U-shaped, Z-shaped, linear type and the like and combination forms thereof. Compared with other materials adopted in engineering construction, the hot-rolled steel sheet pile is an excellent green environment-friendly building foundation construction material. The novel water-stop pipe has the advantages of high strength, light weight, good water-stop performance and the like, is strong in service durability, can be reused for 5-10 times, and has a service life of 20-50 years.
At present, the material of the most common steel sheet pile is usually Q390P, because the carbon content of Q390P produced by adopting the national standard is required to be less than or equal to 0.20%, in order to achieve the expected mechanical property, more expensive alloys are required to be added, such as manganese with the maximum content of 1.70%, vanadium with the maximum content of 0.2%, niobium with the maximum content of 0.06% and titanium with the maximum content of 0.2%. This inevitably increases not only the production cost but also the difficulty of production control. Therefore, in order to control the cost, a general manufacturer controls the carbon content in the component to be about 0.18%, the manganese content to be about 1.5%, the vanadium content to be about 0.04%, and the niobium content to be about 0.02% when producing Q390P. However, because of its low carbon content, the tensile strength of the steel sheet pile product is generally low, generally below 550MPa, even if a small amount of alloying elements are added. Finally, the steel sheet pile is commonly used for less than 10 times, and the recycling rate is not high. Further, since about 1.5% of manganese and about 0.04% of vanadium are added, and about 0.02% of niobium is added, the alloy cost is still high. After retrieval:
the Chinese patent application No. CN200810197630.7 discloses a hot-rolled U-shaped steel sheet pile and a micro-alloying production method thereof, wherein the chemical components of the steel are as follows according to the weight percentage: 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. Preferred ranges thereof are: 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 aluminum is added, calcium treatment is needed, and the castability is poor. And simultaneously, the vanadium content is higher, and the total manufacturing cost is higher. And the tensile strength of the product is lower than 610 MPa.
The Chinese patent application No. CN201010147686.9 discloses a steel for a low-temperature impact resistant hot-rolled U-shaped steel sheet pile and a production method thereof, and the steel comprises the following components in percentage by weight: 0.15-0.20% of C, 0.8-1.5% of Mn, 0.26-0.46% of Si, less than or equal to 0.02% of P, less than or equal to 0.02% of S, 0.015-0.05% of Als, 0.015-0.035% of Nb, 0.0005-0.0012% of B, 0.001-0.005% of Ca, less than or equal to 0.005% of [ O ], and less than or equal to 0.004% of N; the method comprises the following steps: smelting; refining in a converter; vacuum deoxidation treatment, wherein the total oxygen content in the molten steel is controlled to be less than or equal to 0.005 percent; continuous casting; heating the casting blank to 1180-1280 ℃; two-stage rolling is distinguished between austenite recrystallization zones and non-recrystallization zones. Because aluminum is added, calcium treatment is needed, and the castability is poor. Simultaneously, elements such as niobium, boron and the like are added, and vacuum treatment is needed, so that the production difficulty is high, and the total manufacturing cost is high.
The Chinese patent application No. CN201010167972.1 discloses 'steel for hot-rolled U-shaped steel sheet pile resistant to acid soil corrosion and production method thereof', which comprises the following components in percentage by weight: 0.13-0.28% of C, 0.6-1.5% of Mn, 0.10-0.6% of Si, less than or equal to 0.020% of S, less than or equal to 0.02% of P, 0.5-1.2% of Cr, 0.15-0.3% of Mo, and the balance of Fe and inevitable impurities; the method comprises the following steps: smelting: deoxidizing by using Al less than 0.005 percent, and adding lime once when the slag is discharged from the furnace, wherein the thickness of a slag layer is 6-15 mm; continuous casting: pouring temperature is 1570-1580 ℃, superheat degree is 15-35 ℃, pulling speed is 1.0-2.0 m/min, and casting powder thickness is 2-5 mm; preheating a continuous casting billet to 300 ℃ and then to 1150-1300 ℃; preserving the heat for 10-30 minutes; rolling: the initial rolling temperature is 1100-1250 ℃, and the final rolling temperature is 850-920 ℃. Because of the addition of chromium and noble metal molybdenum with high content, the production difficulty is high, and the total manufacturing cost is high.
The Chinese patent application No. CN201010147773.4 discloses a steel for hot-rolled U-shaped steel sheet piles with a yield ratio less than or equal to 0.8 and a production method thereof, and 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 inevitable impurities, and the production method comprises the following steps: smelting; carrying out converter refining; adding Al wires 5-10 minutes before the refining of the converter according to the proportion of 3-5 m/ton steel; adding Si-Ca wires 2.5-7 minutes before the refining of the converter according to the length of 3-10 m/ton steel; carrying out continuous casting; heating the continuous casting billet to 1150-1250 ℃; and (4) rolling. Because aluminum is added, calcium treatment is needed, and the castability is poor.
The Chinese patent application No. CN201010168491.2 discloses a steel for hot-rolled U-shaped steel sheet piles resisting alkaline soil corrosion and a production method thereof, and the steel comprises the following chemical components in percentage by weight: 0.15-0.26% of C, 0.8-1.4% of Mn, 0.10-0.6% of Si, less than or equal to 0.020% of S, less than or equal to 0.02% of P, 0.2-0.5% of Cu, 0.1-0.25% of Ni, and the balance of Fe and inevitable impurities; the method comprises the following steps: smelting and refining in a converter: controlling the alkalinity R of the final slag to be 2-5; continuous casting: controlling the depth of the long nozzle inserted into the crystallizer to be 100-300 mm; heating a continuous casting slab to 1050-1150 ℃; rolling: the initial rolling temperature is 1020-1100 ℃, and the rolling is carried out at the melting point temperature of copper of less than 1083 ℃. Because the copper and the noble metal nickel with higher content are added, the production difficulty is higher, and the total manufacturing cost is higher.
The Chinese patent application No. CN201010147762.6 discloses a steel for hot-rolled U-shaped steel sheet piles with tensile strength of more than or equal to 600MPa and a production method thereof, and the steel comprises the following components in percentage by weight: 0.31-0.50% of C, 1.0-2.0% of Mn, 0.10-0.60% of Si, less than or equal to 0.02% of P, less than or equal to 0.02% of S, 0.01-0.06% of TAl, 0.015-0.035% of Nb and 0.005-0.030% of Ti; the method comprises the following steps: smelting; refining in a converter; adding Si-Ca wires 5-10 minutes before the refining of the converter is finished; continuous casting: controlling the casting temperature and stirring, and controlling the size of the end surface of the continuous casting billet; 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 less than 98%. The carbon content is high, aluminum is added, calcium treatment is needed, and the castability is poor. In addition, niobium and titanium alloy elements are added simultaneously, so that the control difficulty is high, and the production cost is high.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides the economical steel for the hot-rolled U-shaped steel sheet pile and the production method, wherein the steel has the tensile strength of not less than 630MPa, the ferrite grain size of not less than 8 grades, the use times of not less than 15 times, the process is simple, and the production cost is reduced by at least 10 percent compared with the prior art.
The measures for realizing the aim are as follows:
the economical hot-rolled U-shaped sheet pile steel comprises the following components in percentage by weight: c: 0.24-0.30%, Si: 0.20 to 0.30%, Mn: 0.8 to 1.30%, Nb: 0.007-0.011 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 inevitable impurities.
Preferably: the content of C is 0.26-0.28% by weight.
Preferably: the Nb content is 0.008-0.010% by weight.
Preferably: the Mn content is 0.85-1.15 wt%.
A method for producing an economical hot-rolled U-shaped sheet pile steel, comprising the steps of:
1) performing converter smelting, pouring into a blank, and adopting a large scrap ratio mode; controlling the tapping temperature of the converter 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 400 mm; controlling the superheat degree at 15-25 ℃ and the pulling speed at 0.5-0.7 m/min;
2) heating a casting blank, wherein the charging temperature of the casting blank is controlled to be not lower than 400 ℃, and the heating temperature of the casting blank is controlled to be 1150-1250 ℃;
3) carrying out high-pressure water descaling, wherein the pressure is controlled to be 16-25 MPa;
4) carrying out two-stage hot rolling, and controlling the finish rolling temperature to be 750-850 ℃;
5) and conventionally performing post-processing.
The action and mechanism of each metal element and main process in the invention
C is an effective strengthening element in steel, and forms second-phase precipitated particles of a nanometer order with microalloy elements such as Ti and Nb in addition to solid solution strengthening, and plays a role in precipitation strengthening and refining the structure, which is also a common method for improving the strength in general steel. As the most economic strengthening element, the content of C is more than or equal to 0.24 percent, preferably the content of C in percentage by weight is 0.26-0.28 percent; however, excessive C forms more carbide in steel, which reduces the toughness and the forming property of the material and also reduces the welding property of steel, so the content of C is designed to be less than or equal to 0.30 percent.
Si is a common deoxidizing element in steel, has a solid solution strengthening effect on the steel, and can also improve the yield strength and yield ratio of the material. However, the higher Si content lowers the weldability of the material, resulting in deterioration of the toughness of the weld heat-affected zone, and therefore the Si content is designed to be in the range of 0.20 to 0.30%.
Mn is an important strengthening and toughening element in steel and has the effect of solid solution strengthening. The inclusion of certain manganese can eliminate or reduce brittleness of the steel caused by sulfur. Can also reduce the transformation temperature of super-cooled austenite, reduce the phase transition temperature of ferrite, facilitate the tissue refinement and improve the strength and toughness of the material. However, the excessive content of Mn significantly suppresses ferrite transformation and transformation of the structure into bainite, which leads to a decrease in the plasticity and cold formability of the material. Therefore, the Mn content is designed to be 0.8-1.3%, and the Mn content is preferably 0.85-1.15% by weight.
Nb is also a strong element forming a nitride, and may form NbC and Nb (CN) carbide particles to produce a precipitation strengthening effect. Improving the strength without reducing the low temperature impact toughness of the steel. However, niobium reduces the high-temperature thermoplasticity of the steel, thereby increasing the tendency of niobium-containing cast ingots to crack, so that the content should not be too high. While niobium is a noble metal. Therefore, the Nb content is designed to be 0.007-0.011%, and preferably the Nb content is 0.008-0.010% by weight.
P, S is a common harmful impurity element in steel, which has adverse effects on low temperature toughness, welding performance, cold formability, etc., therefore, 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, and the certain argon blowing refining time can ensure the uniformity of the temperature and the components of the molten steel and avoid the temperature rise operation of an LF furnace caused by large molten steel temperature drop due to long-time refining.
The casting width is not less than 400mm, the highest carbon content of the steel grade is only 0.3%, 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 a finished product.
The superheat degree is controlled to be 15-25 ℃ because the temperature range meets the requirements of smooth continuous casting of molten steel and is beneficial to controlling carbon segregation of a casting blank and the like.
The casting blank is heated, the charging temperature of the casting blank is controlled to be not lower than 400 ℃, and the heating temperature is controlled to be 1150-1250 ℃, because the certain charging temperature of the casting blank can improve the heating quality, reduce the heating time and the fuel consumption, and can be realized by only adopting simple heat preservation measures. The heating temperature is controlled to meet the rolling requirement, and the adverse effects of energy consumption increase, surface decarburization of finished products and the like caused by high temperature are avoided.
The final rolling temperature is controlled to be 750-850 ℃ because the temperature is still in the austenite range, the influence of two-phase rolling on the performance can be avoided, and the temperature is low, so that the final mechanical property of the material is favorably improved.
Compared with the prior art, the invention has the tensile strength of not less than 630MPa, the ferrite grain size of not less than 8 grade, the use frequency of not less than 15 times, the molten iron desulphurization is not needed, the electromagnetic stirring is not needed during the pouring, and the production cost can be relatively reduced by at least 10 percent.
Detailed Description
The present invention is described in detail below:
table 1 is a list of chemical compositions for each example of the present invention and comparative example;
table 2 is a table of the main process parameters of each example of the present invention and comparative example;
table 3 is a table of the performance test of each example and comparative example of the present invention.
The embodiments of the invention are produced according to the following steps:
1) after smelting in a converter, pouring the steel into a blank by adopting a large scrap ratio mode; controlling the tapping temperature of the converter 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 400 mm; controlling the superheat degree at 15-25 ℃ and the pulling speed at 0.5-0.7 m/min;
2) heating a casting blank, wherein the charging temperature of the casting blank is controlled to be not lower than 400 ℃, and the heating temperature of the casting blank is controlled to be 1150-1250 ℃;
3) carrying out high-pressure water descaling, wherein the pressure is controlled to be 16-25 MPa;
4) carrying out two-stage hot rolling, and controlling the finish rolling temperature to be 750-850 ℃;
5) and conventionally performing post-processing.
TABLE 1 chemical composition (wt%) of inventive and comparative examples
TABLE 2 Main production Process parameters of examples of the invention and comparative examples
TABLE 3 tabulated product performance and use condition of each example and comparative example of the invention
As can be seen from Table 3, the yield strength and tensile strength of the embodiment of the present invention are significantly higher than those of the comparative example Q390P produced by the national standard, while the elongation is not reduced, and the number of recycling times is significantly higher than that of the Q390P of the national standard in the tracking trial at the user. In addition, the steel-making and rolling manufacturing cost can be reduced by not less than 150 yuan per ton of steel, namely, the steel-making and rolling manufacturing cost is reduced by not less than 10%.
The present embodiments are to be considered in all respects as illustrative and not restrictive.
Claims (5)
1. The economical hot-rolled U-shaped sheet pile steel comprises the following components in percentage by weight: c: 0.24-0.30%, Si: 0.20 to 0.30%, Mn: 0.8 to 1.30%, Nb: 0.007-0.011 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 inevitable impurities.
2. The economical hot-rolled steel for U-shaped sheet piles as claimed in claim 1, wherein: the content of C is 0.26-0.28% by weight.
3. The economical hot-rolled steel for U-shaped sheet piles as claimed in claim 1, wherein: the Nb content is 0.008-0.010% by weight.
4. The economical hot-rolled steel for U-shaped sheet piles as claimed in claim 1, wherein: the Mn content is 0.85-1.15 wt%.
5. A method for producing an economical hot-rolled steel for U-shaped sheet piles according to claim 1, comprising the steps of:
1) performing converter smelting, pouring into a blank, and adopting a large scrap ratio mode; controlling the tapping temperature of the converter 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 400 mm; controlling the superheat degree at 15-25 ℃ and the pulling speed at 0.5-0.7 m/min;
2) heating a casting blank, wherein the charging temperature of the casting blank is controlled to be not lower than 400 ℃, and the heating temperature of the casting blank is controlled to be 1150-1250 ℃;
3) carrying out high-pressure water descaling, wherein the pressure is controlled to be 16-25 MPa;
4) carrying out two-stage hot rolling, and controlling the finish rolling temperature to be 750-850 ℃;
5) and conventionally performing post-processing.
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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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