CN111647810B - Channel steel with yield strength of 355MPa for bridge and production method thereof - Google Patents
Channel steel with yield strength of 355MPa for bridge and production method thereof Download PDFInfo
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- CN111647810B CN111647810B CN202010470134.5A CN202010470134A CN111647810B CN 111647810 B CN111647810 B CN 111647810B CN 202010470134 A CN202010470134 A CN 202010470134A CN 111647810 B CN111647810 B CN 111647810B
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/08—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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- 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
- C22C38/04—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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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Abstract
The invention relates to a channel steel with yield strength of 355MPa for a bridge, which comprises the following chemical components in percentage by weight: 0.010-0.200% of C, 0.10-0.25% of Si, 0.70-1.00% of Mn, 0.010-0.035% of V, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.015-0.030% of Als, and the balance of Fe and inevitable impurities; the waist thickness of the channel steel is 20-50 mm, the yield strength is more than 390MPa, the elongation after fracture is more than 28.0%, the impact absorption energy at minus 20 ℃ is more than 180J, and the impact absorption energy at minus 40 ℃ is more than 100J. The production method comprises the processes of smelting, continuous casting, heating by a heating furnace, rolling and cooling; the invention designs the chemical components of the channel steel and the production process matched with the chemical components, so that the channel steel has excellent strength, plasticity, toughness and comprehensive mechanical properties.
Description
Technical Field
The invention relates to the technical field of channel steel production, in particular to channel steel with yield strength of 355MPa for a bridge and a production method thereof.
Background
The channel steel belongs to one of the shaped steel, has extensive application in fields such as bridge, building structure, curtain wall engineering, mechanical equipment and vehicle manufacturing. The channel steel is required to have better welding performance and excellent comprehensive mechanical performance in the using process. Generally, the shape of the channel steel is required to be produced and supplied according to the GB/T706 standard, wherein the thickness of the channel steel is specified to be maximum 14.5 mm. At present, however, some projects are individually constructed, requirements for special-shaped channel steel with certain functional simplicity (such as welding simplicity and the like) are provided, the size and specification of the special-shaped channel steel are generally different from those of standard channel steel, higher requirements are generally provided for the thickness of the channel steel, the maximum thickness even reaches more than 50mm, and the difficulty in rolling the channel steel is greatly increased. In addition, due to the high requirements of engineering construction, the grade requirements on channel steel are higher and higher, and the increase of the thickness of the channel steel increases the difficulty in controlling the mechanical property of the channel steel in the production process.
Disclosure of Invention
The invention provides a channel steel with 355 MPa-grade yield strength for a bridge and a production method thereof, and the channel steel finally obtained has excellent strength, plasticity, toughness and comprehensive mechanical properties by designing chemical components of the channel steel and a production process matched with the chemical components, and the maximum thickness of the waist part of the channel steel can reach 50 mm.
In order to achieve the purpose, the invention adopts the following technical scheme:
the channel steel for the bridge with the yield strength of 355MPa comprises the following chemical components in percentage by weight: 0.010-0.200% of C, 0.10-0.25% of Si, 0.70-1.00% of Mn, 0.010-0.035% of V, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.015-0.030% of Als, and the balance of Fe and inevitable impurities; the waist thickness of the channel steel is 20-50 mm, the yield strength is more than 390MPa, the elongation after fracture is more than 28.0%, the impact absorption energy at-20 ℃ is more than 180J, and the impact absorption energy at-40 ℃ is more than 100J.
A production method of channel steel with yield strength of 355MPa for bridges comprises the processes of smelting, continuous casting, heating by a heating furnace, rolling and cooling; the specific process is as follows:
1) smelting molten steel according to set components, wherein the smelting process route is as follows: pretreating molten iron, smelting in a converter, and refining in an LF (ladle furnace);
2) continuously casting the molten steel obtained in the step 1) to obtain a casting blank; during continuous casting, the superheat degree of the tundish is controlled to be 35-50 ℃, and the specific water amount of secondary cooling water is controlled to be 0.35-0.40 m3And t, ensuring that the isometric crystal proportion of the section of the casting blank is less than 5.0 percent, and the size of the casting blank is as follows: width x height (200-300) × (300-400) mm;
3) heating the casting blank obtained in the step 2), wherein the heating temperature is 1120-1150 ℃, and the heat preservation time is 30-300 min;
4) rolling the heated casting blank obtained in the step 3), wherein the rolling process is divided into a rough rolling stage and a finish rolling stage, and the control process parameters are as follows:
a) rough rolling; rolling the casting blank into a blank for finish rolling by 5-7 passes, wherein the blank has the following dimensions: length, width and height (180-240) x (90-120) mm; the initial rolling temperature of rough rolling is 1050-1080 ℃;
b) fine rolling; rolling the blank obtained in the step a) for 5-7 times to obtain channel steel, wherein the final rolling temperature is more than or equal to 860 ℃;
5) cooling after rolling; air-cooling the channel steel obtained in the step 4) to below 80 ℃, and then straightening to obtain a channel steel finished product.
In the step 4), a groove for welding is directly rolled on the outer side of the leg of the channel steel by pass rolling in the finish rolling stage.
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, wherein the thickness of the waist part of the channel steel reaches 20-50 mm;
2) the produced channel steel has excellent strength, plasticity, toughness and comprehensive mechanical properties; the yield strength is more than 390MPa, the elongation after fracture is more than 28.0 percent, the impact absorption energy at minus 20 ℃ is more than 180J, and the impact absorption energy at minus 40 ℃ is more than 100J;
3) the groove for welding is directly processed by hot working on the outer side of the steel leg part by pass rolling, so that the working procedure of processing the welding groove in the later period is reduced, and the engineering construction period is shortened.
Drawings
FIG. 1 is a schematic sectional view of a channel steel for a bridge with a yield strength of 355 MPa.
In the figure: 1. groove 2. groove of channel steel
Detailed Description
The invention discloses a channel steel with yield strength of 355MPa for a bridge, which comprises the following chemical components in percentage by weight: 0.010-0.200% of C, 0.10-0.25% of Si, 0.70-1.00% of Mn, 0.010-0.035% of V, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.015-0.030% of Als, and the balance of Fe and inevitable impurities; the waist thickness of the channel steel is 20-50 mm, the yield strength is more than 390MPa, the elongation after fracture is more than 28.0%, the impact absorption energy at-20 ℃ is more than 180J, and the impact absorption energy at-40 ℃ is more than 100J.
The design principle of each chemical component in the channel steel with the yield strength of 355MPa for the bridge is as follows:
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 of C is too high, it is unfavorable for low-temperature toughness and weldability of steel. Therefore, the invention comprehensively considers the factors of cost, performance and the like, and the range of the control C is 0.010-0.200%.
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 0.10-0.25%.
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 0.70-1.00%.
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 is controlled to be 0.010-0.035%.
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%.
A production method of channel steel with yield strength of 355MPa for bridges comprises the processes of smelting, continuous casting, heating by a heating furnace, rolling and cooling; the specific process is as follows:
1) smelting molten steel according to set components, wherein the smelting process route is as follows: pretreating molten iron, smelting in a converter, and refining in an LF (ladle furnace);
2) continuously casting the molten steel obtained in the step 1) to obtain a casting blank; during continuous casting, the superheat degree of the tundish is controlled to be 35-50 ℃, and the specific water amount of secondary cooling water is controlled to be 0.35-0.40 m3And t, ensuring that the isometric crystal proportion of the section of the casting blank is less than 5.0 percent, and the size of the casting blank is as follows: width x height (200-300) × (300-400) mm;
3) heating the casting blank obtained in the step 2), wherein the heating temperature is 1120-1150 ℃, and the heat preservation time is 30-300 min;
4) rolling the heated casting blank obtained in the step 3), wherein the rolling process is divided into a rough rolling stage and a finish rolling stage, and the control process parameters are as follows:
a) rough rolling; rolling the casting blank into a blank for finish rolling by 5-7 passes, wherein the blank has the following dimensions: length, width and height (180-240) x (90-120) mm; the initial rolling temperature of rough rolling is 1050-1080 ℃;
b) fine rolling; rolling the blank obtained in the step a) for 5-7 times to obtain channel steel, wherein the final rolling temperature is more than or equal to 860 ℃;
5) cooling after rolling; air-cooling the channel steel obtained in the step 4) to below 80 ℃, and then straightening to obtain a channel steel finished product.
In the above step 4), the groove 2 for welding is directly rolled outside the leg of the channel steel 1 by pass rolling in the finish rolling stage (as shown in fig. 1).
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
In the embodiment, the chemical components of the channel steel for the bridge with the yield strength of 355MPa are shown in table 1, and the main smelting process parameters are shown in table 2.
TABLE 1 chemical composition of channel steel (wt%)
| Examples | C | Si | Mn | P | S | V | Als |
| 1 | 0.167 | 0.13 | 0.82 | 0.008 | 0.004 | 0.026 | 0.018 |
| 2 | 0.176 | 0.22 | 0.78 | 0.009 | 0.003 | 0.024 | 0.028 |
| 3 | 0.146 | 0.16 | 0.99 | 0.007 | 0.001 | 0.014 | 0.017 |
| 4 | 0.124 | 0.21 | 0.93 | 0.006 | 0.002 | 0.028 | 0.023 |
| 5 | 0.137 | 0.19 | 0.88 | 0.005 | 0.003 | 0.032 | 0.027 |
| 6 | 0.189 | 0.23 | 0.73 | 0.006 | 0.004 | 0.016 | 0.026 |
TABLE 2 Main smelting Process parameters
| Examples | Degree of superheat/. degree.C | Specific water volume of secondary cooling water/m3/t | Isometric ratio/%) |
| 1 | 38 | 0.38 | 3.4 |
| 2 | 43 | 0.36 | 4.1 |
| 3 | 48 | 0.39 | 2.2 |
| 4 | 46 | 0.37 | 3.1 |
| 5 | 41 | 0.36 | 4.6 |
| 6 | 39 | 0.37 | 2.8 |
And continuously casting the smelted 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
| Examples | Thickness of | Bevel angle | Temperature of heating | Time of heat preservation | Roughing mill pass | Initial rolling temperature | Finishing rolling way | Temperature of finish rolling |
| 1 | 34 | 46 | 1140 | 80 | 7 | 1065 | 7 | 880 |
| 2 | 23 | 53 | 1130 | 90 | 7 | 1075 | 7 | 875 |
| 3 | 46 | 58 | 1125 | 100 | 5 | 1055 | 5 | 900 |
| 4 | 39 | 42 | 1145 | 180 | 5 | 1070 | 7 | 880 |
| 5 | 43 | 38 | 1125 | 200 | 5 | 1060 | 5 | 890 |
| 6 | 29 | 33 | 1135 | 60 | 7 | 1055 | 7 | 865 |
In this example, the mechanical properties of the channel steel are shown in table 4.
TABLE 4 mechanical Properties of steels of examples of the invention
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 (1)
1. The channel steel for the bridge with the yield strength of 355MPa is characterized by comprising the following chemical components in percentage by weight: 0.124-0.200% of C, 0.10-0.25% of Si, 0.70-0.88% of Mn, 0.010-0.035% of V, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.015-0.030% of Als, and the balance of Fe and inevitable impurities; the waist thickness of the channel steel is 20-50 mm, the yield strength is more than 390MPa, the elongation after fracture is more than 28.0 percent, the impact absorption energy at-20 ℃ is more than 180J, and the impact absorption energy at-40 ℃ is more than 100J;
a production method of channel steel with yield strength of 355MPa for bridges comprises the processes of smelting, continuous casting, heating by a heating furnace, rolling and cooling; the specific process is as follows:
1) smelting molten steel according to set components, wherein the smelting process route is as follows: pretreating molten iron, smelting in a converter, and refining in an LF (ladle furnace);
2) continuously casting the molten steel obtained in the step 1) to obtain a casting blank; during continuous casting, the superheat degree of the tundish is controlled to be 35-50 ℃, and the specific water amount of secondary cooling water is controlled to be 0.35-0.40 m3And t, ensuring that the isometric crystal proportion of the section of the casting blank is less than 5.0 percent, and the size of the casting blank is as follows: width x height (200-300) × (300-400) mm;
3) heating the casting blank obtained in the step 2), wherein the heating temperature is 1120-1145 ℃, and the heat preservation time is 30-300 min;
4) rolling the heated casting blank obtained in the step 3), wherein the rolling process is divided into a rough rolling stage and a finish rolling stage, and the control process parameters are as follows:
a) rough rolling; rolling the casting blank into a blank for finish rolling by 5-7 passes, wherein the blank has the following dimensions: length, width and height (180-240) x (90-120) mm; the initial rolling temperature of rough rolling is 1050-1080 ℃;
b) fine rolling; rolling the blank obtained in the step a) for 5-7 times to obtain channel steel, wherein the final rolling temperature is more than or equal to 860 ℃; directly rolling a groove for welding on the outer side of the leg part of the channel steel by groove rolling;
5) cooling after rolling; air-cooling the channel steel obtained in the step 4) to below 80 ℃, and then straightening to obtain a channel steel finished product.
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