CN111500937A - 460 MPa-level bridge channel steel and production method thereof - Google Patents
460 MPa-level bridge channel steel and production method thereof 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- 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
- B21B1/08—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 structural sections, i.e. work of special cross-section, e.g. angle steel
- B21B1/095—U-or channel sections
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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Abstract
The invention relates to a 460 MPa-level channel steel for a bridge, which comprises the following chemical components in percentage by weight: 0.140 to 0.200 percent of C, 0.10 to 0.40 percent of Si, 1.15 to 1.45 percent of Mn, 0.010 to 0.030 percent of Nb, 0.050 to 0.090 percent of V, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S, 0.0130 to 0.0170 percent of N, 0.015 to 0.030 percent of Als, and the balance of Fe and inevitable impurities; the production method comprises the processes of smelting, continuous casting, heating, rolling and cooling; according to the invention, the channel steel for the bridge with excellent mechanical properties is finally obtained by designing the chemical components of the channel steel and designing the production process matched with the chemical components; the groove for welding is directly processed outside the leg of the channel steel by hot working, so that the procedure of processing the welding groove in the later period is omitted, and the engineering construction period is shortened.
Description
Technical Field
The invention relates to the technical field of channel steel production, in particular to a 460 MPa-level channel steel for a bridge and a production method.
Background
Channel steel is an important component of profile steel and is widely applied to steel structures, municipal construction, ship bridges and mechanical products; generally, the shape of the channel steel is required to be produced and supplied according to the GB/T706 standard, and the thickness of the channel steel is only 14.5mm at most according to the standard. At present, some bridge projects put forward new requirements on channel steel, for example, the requirement on the thickness of the waist of the channel steel is greater, and the requirement on the mechanical property of the channel steel is more severe, so that the channel steel is required to have excellent strength, plasticity and toughness.
The Chinese patent application with the application number of 201610544205.5 discloses 'a low-temperature resistant hot-rolled channel steel for ocean engineering and a manufacturing method thereof', wherein the yield strength of the channel steel is more than or equal to 355MPa, the tensile strength is more than or equal to 470MPa, and the low-temperature impact energy is more than or equal to 34J, but the chemical components of the channel steel contain higher Mn content, the maximum content reaches 1.6%, the central segregation of the channel steel is increased, the maximum thickness of the waist part of the channel steel is only about 12mm, and the requirement of bridge engineering can not be met.
Disclosure of Invention
The invention provides a 460 MPa-level channel steel for a bridge and a production method thereof, and the channel steel with excellent mechanical property for the bridge is finally obtained by designing chemical components of the channel steel and designing a production process matched with the chemical components; the groove for welding is directly processed outside the leg of the channel steel by hot working, so that the procedure of processing the welding groove in the later period is omitted, and the engineering construction period is shortened.
In order to achieve the purpose, the invention adopts the following technical scheme:
a460 MPa-grade channel steel for a bridge comprises the following chemical components in percentage by weight: 0.140 to 0.200 percent of C, 0.10 to 0.40 percent of Si, 1.15 to 1.45 percent of Mn, 0.010 to 0.030 percent of Nb, 0.050 to 0.090 percent of V, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S, 0.0130 to 0.0170 percent of N, 0.015 to 0.030 percent of Als, and the balance of Fe and inevitable impurities; the thickness of the waist of the channel steel is 20-50 mm, grooves formed by rolling are arranged on the outer sides of the legs, and the groove angle is 30-60 degrees; the yield strength of the channel steel is more than 480MPa, the elongation after fracture is more than 26.0 percent, the impact absorption energy at minus 20 ℃ is more than 150J, and the impact absorption energy at minus 40 ℃ is more than 100J.
A production method of 460 MPa-level channel steel for bridges comprises the processes of smelting, continuous casting, heating, rolling and cooling; the production process specifically comprises the following steps:
1) molten steel smelting is carried out according to the designed components, and the smelting process route comprises the steps of molten iron pretreatment, converter smelting, L F refining, RH refining and continuous casting, nitrogen blowing treatment is carried out in the converter smelting or RH refining process, the nitrogen content in the molten steel is controlled to reach the target range, the RH treatment time is 25-50 min, and [ H ] is controlled to be less than or equal to 2.0ppm and [ O ] is controlled to be less than or equal to 20ppm in the steel;
2) continuously casting the molten steel obtained in the step 1) to obtain a casting blank, wherein the superheat degree of a tundish is controlled to be 30-40 ℃ during continuous casting, and the specific water amount of secondary cooling water is 0.45-0.50 m3T, enabling the isometric crystal proportion of the continuous casting billet section to be less than 4.5 percent;
3) stacking and slowly cooling the casting blank obtained in the step 2) for more than or equal to 20 h;
4) heating the casting blank subjected to slow cooling in the step 3), wherein the heating temperature is 1210-1280 ℃, the heating speed is 5-30 ℃/min, and the soaking time is 60-300 min;
5) rolling the casting blank heated in the step 4), wherein the rolling process is divided into three stages of cogging, rough rolling and finish rolling, and the control process parameters are as follows:
a) cogging, namely, descaling the heated casting blank by high-pressure water, and cogging, wherein the size of the cogged blank is (220-280) × (220-280) × (100-150) mm;
b) rough rolling, namely rolling the cogging blank for 3-5 times to prepare a blank for finish rolling, wherein the size of the blank for finish rolling is (180-240) × (180-240) × (90-120), and the rough rolling starting temperature is 1150-1180 ℃;
c) fine rolling; rolling the blank for finish rolling for 5-7 times to obtain channel steel, and rolling a groove for welding directly on the outer side of a leg of the channel steel by using pass rolling; the initial rolling temperature of finish rolling is 880-930 ℃, and the final rolling temperature is 850-880 ℃;
6) cooling after rolling; and (3) rapidly cooling the channel steel obtained in the step 5), wherein the temperature of the red returning is 550-650 ℃, then air-cooling to below 80 ℃, and straightening to obtain a channel steel finished product.
Compared with the prior art, the invention has the beneficial effects that:
1) the channel steel for the bridge with excellent mechanical property is finally obtained by designing the chemical components of the channel steel and designing the production process matched with the chemical components.
2) The groove for welding is directly processed outside the leg of the channel steel by hot working, so that the procedure of processing the welding groove in the later period is omitted, and the engineering construction period is shortened.
Drawings
FIG. 1 is a schematic cross-sectional structure view of a 460 MPa-level bridge channel steel.
In the figure: 1. groove 2. groove of channel steel
Detailed Description
The invention discloses a 460 MPa-level channel steel for a bridge, which comprises the following chemical components in percentage by weight: 0.140 to 0.200 percent of C, 0.10 to 0.40 percent of Si, 1.15 to 1.45 percent of Mn, 0.010 to 0.030 percent of Nb, 0.050 to 0.090 percent of V, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S, 0.0130 to 0.0170 percent of N, 0.015 to 0.030 percent of Als, and the balance of Fe and inevitable impurities; the thickness of the waist of the channel steel is 20-50 mm, grooves formed by rolling are arranged on the outer sides of the legs, and the groove angle is 30-60 degrees; the yield strength of the channel steel is more than 480MPa, the elongation after fracture is more than 26.0 percent, the impact absorption energy at minus 20 ℃ is more than 150J, and the impact absorption energy at minus 40 ℃ is more than 100J.
A production method of 460 MPa-level channel steel for bridges comprises the processes of smelting, continuous casting, heating, rolling and cooling; the production process specifically comprises the following steps:
1) molten steel smelting is carried out according to the designed components, and the smelting process route comprises the steps of molten iron pretreatment, converter smelting, L F refining, RH refining and continuous casting, nitrogen blowing treatment is carried out in the converter smelting or RH refining process, the nitrogen content in the molten steel is controlled to reach the target range, the RH treatment time is 25-50 min, and [ H ] is controlled to be less than or equal to 2.0ppm and [ O ] is controlled to be less than or equal to 20ppm in the steel;
2) continuously casting the molten steel obtained in the step 1) to obtain a casting blank, wherein the superheat degree of a tundish is controlled to be 30-40 ℃ during continuous casting, and the specific water amount of secondary cooling water is 0.45-0.50 m3T, enabling the isometric crystal proportion of the continuous casting billet section to be less than 4.5 percent;
3) stacking and slowly cooling the casting blank obtained in the step 2) for more than or equal to 20 h;
4) heating the casting blank subjected to slow cooling in the step 3), wherein the heating temperature is 1210-1280 ℃, the heating speed is 5-30 ℃/min, and the soaking time is 60-300 min;
5) rolling the casting blank heated in the step 4), wherein the rolling process is divided into three stages of cogging, rough rolling and finish rolling, and the control process parameters are as follows:
a) cogging, namely, descaling the heated casting blank by high-pressure water, and cogging, wherein the size of the cogged blank is (220-280) × (220-280) × (100-150) mm;
b) rough rolling, namely rolling the cogging blank for 3-5 times to prepare a blank for finish rolling, wherein the size of the blank for finish rolling is (180-240) × (180-240) × (90-120), and the rough rolling starting temperature is 1150-1180 ℃;
c) fine rolling; rolling the blank for finish rolling for 5-7 times to obtain channel steel, and rolling a groove for welding directly on the outer side of a leg of the channel steel by using pass rolling; the initial rolling temperature of finish rolling is 880-930 ℃, and the final rolling temperature is 850-880 ℃;
6) cooling after rolling; and (3) rapidly cooling the channel steel obtained in the step 5), wherein the temperature of the red returning is 550-650 ℃, then air-cooling to below 80 ℃, and straightening to obtain a channel steel finished product.
The invention discloses a 460 MPa-level bridge channel steel, which comprises the following chemical components:
c: the main strengthening elements in the steel are main elements for improving the hardenability of the steel; if the content is too low, the amount of carbide and the like produced decreases, and the effect of refining grains during rolling is impaired. When the content is too high, the low-temperature toughness and weldability of the steel are adversely affected. Therefore, the invention comprehensively considers the factors of cost, performance and the like, and the range of C control is 0.140-0.200%.
Si: the necessary elements for steel-making deoxidation have strong solid solution capability in steel and can play a certain strengthening role, but the low-temperature toughness and welding performance of the steel are seriously damaged due to too high content. The invention controls the range of Si to be 0.10-0.40%.
Mn: can delay the transformation of ferrite and pearlite in steel, greatly increase the hardenability of the steel, reduce the brittle transformation temperature of the steel and improve the impact toughness, but the Mn content is too high, so that segregation is easily formed in the steel, and the plasticity and the toughness of the steel are adversely affected. Comprehensively, the range of Mn controlled by the invention is 1.15-1.45%.
Nb: can refine grains, reduce the overheating sensitivity and the tempering brittleness of steel and improve the strength of the steel, but the plasticity and the toughness are reduced. The range of Nb controlled by the invention is 0.010 percent to 0.030 percent.
V: a strong carbide forming element. The influence on austenite recrystallization is small, and a large amount of V carbon and nitride are separated out at low temperature to play the roles of refining and strengthening crystal grains, so that the strength of the steel is improved. The range of V controlled by the invention is 0.050% -0.090%.
N: n exists in the steel mainly in a free state and a compound state, wherein the existence of the former is unfavorable for the toughness of the steel, and the existence of the latter has a good influence on the comprehensive performance of the steel. In the case of a steel containing V, most of V does not sufficiently exhibit its precipitation strengthening action when nitrogen is deficient in the steel. In addition, the nitrogen-containing steel not only eliminates the cost increase caused by degassing and refining denitrogenation in the steel-making process, but also can fully play the role of microalloy elements by increasing nitrogen in the steel, saves the using amount of alloying elements and greatly reduces the production cost. The invention controls the range of N to be 0.0130-0.0170%.
Al: the strong deoxidizer generates highly-finely-divided and ultra-microscopic oxides in the steel, and plays a role in refining grains. The invention controls the range of Als to be 0.015-0.030%.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ examples ] A method for producing a compound
The designed chemical composition range of the invention is smelted, the chemical composition is shown in table 1, and the smelting process is shown in table 2.
TABLE 1 chemical composition of channel steel (wt%)
| Examples | C | Si | Mn | P | S | Nb | | N | Als | |
| 1 | 0.167 | 0.19 | 1.18 | 0.004 | 0.005 | 0.013 | 0.061 | 0.0139 | 0.018 | |
| 2 | 0.176 | 0.26 | 1.22 | 0.007 | 0.003 | 0.017 | 0.082 | 0.0146 | 0.024 | |
| 3 | 0.146 | 0.32 | 1.29 | 0.005 | 0.004 | 0.028 | 0.073 | 0.0169 | 0.016 | |
| 4 | 0.194 | 0.14 | 1.44 | 0.006 | 0.002 | 0.021 | 0.056 | 0.0158 | 0.021 | |
| 5 | 0.186 | 0.21 | 1.31 | 0.008 | 0.003 | 0.024 | 0.081 | 0.0163 | 0.028 | |
| 6 | 0.142 | 0.37 | 1.37 | 0.009 | 0.004 | 0.019 | 0.074 | 0.0153 | 0.022 |
TABLE 2 molten steel smelting process parameters
| Examples | Degree of superheat/. degree.C | Specific water volume of secondary cooling water/m3/t | Isometric ratio/%) |
| 1 | 33 | 0.47 | 2.8 |
| 2 | 38 | 0.49 | 3.7 |
| 3 | 32 | 0.46 | 1.8 |
| 4 | 36 | 0.48 | 2.7 |
| 5 | 34 | 0.48 | 2.9 |
| 6 | 37 | 0.46 | 2.4 |
And casting the molten steel into a casting blank, and heating, rolling, cooling and the like to obtain the channel steel. The heating and rolling process parameters are shown in table 3.
TABLE 3 heating and Rolling Process parameters
The mechanical properties of the steels corresponding to the examples of the invention are shown in table 4.
TABLE 4 mechanical Properties of the channel steels
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (2)
1. The 460 MPa-level channel steel for the bridge is characterized by comprising the following chemical components in percentage by weight: 0.140 to 0.200 percent of C, 0.10 to 0.40 percent of Si, 1.15 to 1.45 percent of Mn, 0.010 to 0.030 percent of Nb, 0.050 to 0.090 percent of V, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S, 0.0130 to 0.0170 percent of N, 0.015 to 0.030 percent of Als, and the balance of Fe and inevitable impurities; the thickness of the waist of the channel steel is 20-50 mm, grooves formed by rolling are arranged on the outer sides of the legs, and the groove angle is 30-60 degrees; the yield strength of the channel steel is more than 480MPa, the elongation after fracture is more than 26.0 percent, the impact absorption energy at minus 20 ℃ is more than 150J, and the impact absorption energy at minus 40 ℃ is more than 100J.
2. The production method of 460MPa grade channel steel for bridge of claim 1, comprising smelting, continuous casting, heating, rolling and cooling processes; the method is characterized by comprising the following specific production processes:
1) molten steel smelting is carried out according to the designed components, and the smelting process route comprises the steps of molten iron pretreatment, converter smelting, L F refining, RH refining and continuous casting, nitrogen blowing treatment is carried out in the converter smelting or RH refining process, the nitrogen content in the molten steel is controlled to reach the target range, the RH treatment time is 25-50 min, and [ H ] is controlled to be less than or equal to 2.0ppm and [ O ] is controlled to be less than or equal to 20ppm in the steel;
2) continuously casting the molten steel obtained in the step 1) to obtain a casting blank, wherein the superheat degree of a tundish is controlled to be 30-40 ℃ during continuous casting, and the specific water amount of secondary cooling water is 0.45-0.50 m3T, enabling the isometric crystal proportion of the continuous casting billet section to be less than 4.5 percent;
3) stacking and slowly cooling the casting blank obtained in the step 2) for more than or equal to 20 h;
4) heating the casting blank subjected to slow cooling in the step 3), wherein the heating temperature is 1210-1280 ℃, the heating speed is 5-30 ℃/min, and the soaking time is 60-300 min;
5) rolling the casting blank heated in the step 4), wherein the rolling process is divided into three stages of cogging, rough rolling and finish rolling, and the control process parameters are as follows:
a) cogging, namely, descaling the heated casting blank by high-pressure water, and cogging, wherein the size of the cogged blank is (220-280) × (220-280) × (100-150) mm;
b) rough rolling, namely rolling the cogging blank for 3-5 times to prepare a blank for finish rolling, wherein the size of the blank for finish rolling is (180-240) × (180-240) × (90-120), and the rough rolling starting temperature is 1150-1180 ℃;
c) fine rolling; rolling the blank for finish rolling for 5-7 times to obtain channel steel, and rolling a groove for welding directly on the outer side of a leg of the channel steel by using pass rolling; the initial rolling temperature of finish rolling is 880-930 ℃, and the final rolling temperature is 850-880 ℃;
6) cooling after rolling; and (3) rapidly cooling the channel steel obtained in the step 5), wherein the temperature of the red returning is 550-650 ℃, then air-cooling to below 80 ℃, and straightening to obtain a channel steel finished product.
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| CN113174539A (en) * | 2021-04-25 | 2021-07-27 | 鞍钢股份有限公司 | Q345-grade FCB high heat input welding bridge steel, manufacturing method and welding process |
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