CN117802296A - Production method of ultra-large H-shaped steel with yield strength of 420MPa - Google Patents
Production method of ultra-large H-shaped steel with yield strength of 420MPa Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 177
- 239000010959 steel Substances 0.000 title claims abstract description 177
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 112
- 238000005496 tempering Methods 0.000 claims abstract description 18
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 64
- 238000000034 method Methods 0.000 claims description 20
- 239000002344 surface layer Substances 0.000 claims description 16
- 239000010410 layer Substances 0.000 claims description 12
- 239000012535 impurity Substances 0.000 claims description 10
- 229910001562 pearlite Inorganic materials 0.000 claims description 10
- 229910000859 α-Fe Inorganic materials 0.000 claims description 10
- 238000005096 rolling process Methods 0.000 abstract description 19
- 229910000746 Structural steel Inorganic materials 0.000 abstract description 2
- 239000000126 substance Substances 0.000 description 11
- 229910052799 carbon Inorganic materials 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
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Abstract
A production method of ultra-large H-shaped steel with yield strength of 420MPa belongs to the field of structural steel manufacturing. The invention provides a production method of ultra-large H-shaped steel with yield strength of 420MPa, which mainly comprises the steps of component design of ultra-large H-shaped steel and ultra-rapid cooling after rolling to obtain ultra-large H-shaped steel with flange thickness of 40-65 mm, flange tempering sorbite layer thickness of 4.5-12 mm, maximum deformation in the horizontal direction of less than 6mm, yield strength of more than or equal to 420MPa, tensile strength of more than or equal to 520MPa, elongation of more than or equal to 20%, longitudinal impact energy of 0 ℃ of more than 34J and excellent comprehensive mechanical properties. The invention not only controls the deformation condition of the oversized H-shaped steel, but also improves the strength and toughness of the oversized H-shaped steel and improves the comprehensive mechanical property of the oversized H-shaped steel.
Description
Technical Field
The invention belongs to the field of structural steel manufacturing, and particularly relates to a production method of ultra-large H-shaped steel with yield strength of 420 MPa.
Background
In recent years, the demand for H-section steel of large size and height in the construction industry has been increasing. The application of oversized H-steel is beneficial to improving the construction efficiency of large structures and social infrastructures. The width of the web plate of the H-shaped steel with the maximum size which can be produced in China at present is 1000mm; the width of the web of the H-shaped steel with the maximum size which can be produced abroad is 1200mm. At present, research and production of oversized H-shaped steel at home and abroad are still in a starting stage.
In the cooling process of the H-shaped steel after rolling, the cooling of each part is uneven, so that the temperature difference of the section of the H-shaped steel is overlarge, and the section of the H-shaped steel is greatly deformed, and the yield and the subsequent use safety of the H-shaped steel are affected by the cooling deformation of the H-shaped steel after rolling. For smaller deformation, straightening treatment can be performed by a straightener, and when the deformation is too large, the H-shaped steel cannot be effectively straightened. Even if the straightening can be effectively carried out, when the H-shaped steel is cut and used, the stress generated by uneven cooling can be released, so that the H-shaped steel is cracked. Meanwhile, the uneven cooling of the H-shaped steel after rolling can also affect the overall structure uniformity, so that the structure types and the contents of different parts of the H-shaped steel are different, and the mechanical properties and the quality of finished products are seriously affected. At present, many students study the cooling and deformation of the middle and small H-shaped steel after rolling, and the middle and small H-shaped steel is smaller in deformation and more uniform in tissue distribution after being cooled by the ultra-fast cooling technology after rolling. The oversized H-shaped steel is oversized, so that the control difficulty of deformation and structural performance is far higher than that of the H-shaped steel with smaller specification.
Disclosure of Invention
In order to solve the technical problems, the invention provides a production method of ultra-large H-shaped steel with yield strength of 420MPa, which mainly comprises component design of ultra-large H-shaped steel and ultra-rapid cooling after rolling to obtain ultra-large H-shaped steel with flange thickness of 40-65 mm, flange tempered sorbite layer thickness of 4.5-12 mm, maximum deformation in horizontal direction of less than 6mm, yield strength of more than or equal to 420MPa, tensile strength of more than or equal to 520MPa, elongation of more than or equal to 20%, longitudinal impact energy of 0 ℃ of more than 34J and excellent comprehensive mechanical properties.
In order to achieve the above purpose, the invention adopts the following specific technical scheme:
a production method of ultra-large H-shaped steel with yield strength of 420MPa level comprises the following steps:
s1: and (3) feeding the finish-rolled oversized H-shaped steel into an ultra-fast cooling device for water cooling, controlling the deformation of the ultra-large H-shaped steel by controlling the water flow of different parts of the ultra-large H-shaped steel, wherein the cooling temperature is 950-1000 ℃, the water cooling time is 15-25 s, the roller way speed is 0.8-1.2 m/s, the cooling speed is 22.4-46.7 ℃/s, and the final cooling temperature is 300-390 ℃ to obtain the final-cooled oversized H-shaped steel.
S2: and after final cooling, the surface layer of the oversized H-shaped steel is subjected to temperature returning phenomenon, the temperature is 580-670 ℃, tempered sorbite is generated, and the oversized H-shaped steel with the yield strength of 420MPa is obtained, wherein the maximum deformation in the horizontal direction is less than 6mm.
In the S1, the components of the oversized H-shaped steel are required to be as follows, wherein the components comprise the following chemical components in percentage by mass: c:0.15 to 0.20 percent, si:0.22 to 0.35 percent, mn:1.51 to 1.70 percent; v:0.15 to 0.20 percent; ti:0.15 to 0.20 percent; p: less than or equal to 0.012 percent, S: less than or equal to 0.010%, al:0.015 to 0.036 percent, nb:0.028 to 0.046 percent, and the balance of Fe and unavoidable impurities.
In the S1, ultra-fast cooling equipment is adopted to cool water at different positions of the ultra-large H-shaped steel, the water pressure of the ultra-fast cooling equipment is 1.2-1.5 MPa, and the water flow rate of a nozzle at the outer surface of a flange is 3.3-4.1 m 3 And/h, nozzle water flow at the inner surface of the flange is 3.8-4.5 m 3 And/h, the water flow rate of the nozzle at the lower R angle is 4.1-4.6 m 3 And/h, nozzle water flow at the lower surface of the web plate is 3.3-3.8 m 3 /h。
The ultra-large H-shaped steel with the yield strength of 420MPa is produced by adopting the method, and after cooling, the yield strength is more than or equal to 420MPa, the tensile strength is more than or equal to 520MPa, the elongation is more than or equal to 20%, the impact energy at the longitudinal temperature of 0 ℃ is more than 34J, and the maximum deformation in the horizontal direction is less than 6mm.
The yield strength of the ultra-large H-shaped steel with 420MPa grade is 1600mm multiplied by 500mm, the thickness of a flange is 40-65 mm, the thickness of a flange tempering sorbite layer is 4.5-12 mm, and a core structure is ferrite and pearlite structure.
The invention relates to a method for controlling the action of each chemical component of ultra-large H-shaped steel with yield strength of 420MPa, which comprises the following steps:
c:0.15 to 0.20 percent, wherein, C can improve the strength and hardness of the steel, and excessive C can reduce the plasticity and toughness of the steel;
si:0.22 to 0.35 percent, the Si element has stronger solid solution effect, and the too small content can reduce the hardenability, hardness, wear resistance and corrosion resistance of the steel; si is excessive to reduce the toughness of the steel;
mn:1.51 to 1.70 percent, mn can improve the hardenability of steel, the too little content can reduce the strength of the steel, and the excessive Mn is unfavorable for the forming of the steel;
p: less than or equal to 0.012 percent, S: less than or equal to 0.010 percent, P, S can reduce the mechanical property of the steel, and the content of the two elements in the steel should be reduced as much as possible;
al:0.015 to 0.036 percent, the oxide can prevent the growth of crystal grains when the steel is heated, the content is too low, the oxidation resistance and the wear resistance of the steel can be reduced, the graphitization of the steel can be promoted by excessive content, the carbon solution concentration in alloy items can be reduced, and the strength and the hardness of the steel can be reduced;
nb: 0.028-0.046%, nb enhances the strength and corrosion resistance of the steel by fine crystal strengthening and dispersion strengthening. Too low a content can increase the tempering brittleness of the steel, and too high a content can generate brittle phases, so that the toughness and hot workability of the steel are reduced;
v: 0.15-0.20%, V can be used as grain refiner, reduce grain size, improve plasticity and toughness of steel; too low a content can reduce the toughness of the steel, and too high a content can reduce the hardness of the steel;
ti:0.15 to 0.20 percent, ti can effectively improve the corrosion resistance of steel, meanwhile, grains can be refined, the inter-crystal corrosion can be caused by the excessively low content, and the hardness of the steel can be reduced by the excessively high content.
The beneficial effects of the invention are as follows:
the invention provides a production method of ultra-large H-shaped steel with yield strength of 420MPa, which mainly develops the ultra-large H-shaped steel with flange thickness of 40-65 mm, flange tempering sorbite layer thickness of 4.5-12 mm, maximum deformation in the horizontal direction of less than 6mm, yield strength of more than or equal to 420MPa, tensile strength of more than or equal to 520MPa, elongation of more than or equal to 20%, longitudinal impact energy of 0 ℃ of more than 34J and excellent comprehensive mechanical properties of 1600mm multiplied by 500mm specification.
The deformation control and the structure property regulation of the ultra-large H-shaped steel at 420MPa level are realized by controlling the components of the ultra-large H-shaped steel and an ultra-rapid cooling process (nozzle water flow and cooling time). And (3) after finish rolling, the oversized H-shaped steel enters ultra-fast cooling equipment through a roller way, the surface of the oversized H-shaped steel is subjected to fast cooling, and the temperature is rapidly reduced to below the martensite or bainite transformation temperature, so that a corresponding phase change product is obtained. After water cooling is finished, the core part of the oversized H-shaped steel still has higher temperature, and the surface of the oversized H-shaped steel is subjected to temperature returning. The final surface layer structure is tempered sorbite, and the core structure is ferrite+pearlite structure. The method not only controls the deformation condition of the oversized H-shaped steel, but also improves the strength and toughness of the oversized H-shaped steel and improves the comprehensive mechanical property of the oversized H-shaped steel.
Drawings
FIG. 1 is a schematic diagram of a cooling location for oversized H-section steel;
FIG. 2 is a metallographic structure of the flange surface layer of the oversized H-steel in example 1;
FIG. 3 is a metallographic structure of the flange core of the oversized H-section steel in example 1;
FIG. 4 is a metallographic structure of the flange surface layer of the oversized H-steel in example 2;
FIG. 5 is a metallographic structure of the flange core of the oversized H-section steel of example 2;
FIG. 6 is a metallographic structure of the flange surface layer of the oversized H-steel in example 3;
FIG. 7 is a metallographic structure of the flange core of the oversized H-section steel of example 3;
FIG. 8 is a metallographic structure of the flange surface layer of the oversized H-steel in example 4;
FIG. 9 is a metallographic structure of the flange core of the oversized H-steel in example 4.
Detailed Description
The present invention will be further described with reference to specific embodiments and fig. 1-9, but is not limited to these embodiments, wherein a schematic diagram of the cooling position of the oversized H-section steel in the embodiments of the present invention is shown in fig. 1.
Example 1
A control method for cooling deformation and structural performance of ultra-large H-shaped steel with yield strength of 420MPa level after rolling comprises the following steps:
step 1: the ultra-large H-shaped steel enters ultra-fast cooling equipment for water cooling, the water pressure of the ultra-fast cooling equipment is 1.2MPa, and the water flow of a nozzle at the outer surface of a flange is 3.3m 3 And/h, nozzle water flow at the inner surface of the flange 3.8m 3 And/h, the water flow rate of the nozzle at the lower R angle is 4.2m 3 And/h, nozzle water flow at the lower surface of the web 3.3m 3 And/h. The roller way speed is 1.2m/s, the ultra-large H-shaped steel with the flange thickness of 45mm is subjected to ultra-rapid cooling, the cooling temperature is 961 ℃, the cooling time is 15s, the final cooling temperature is 377 ℃, and the cooling speed is 36.3 ℃/s, so that the ultra-large H-shaped steel after final cooling is obtained.
Step 2: and (3) carrying out temperature return on the surface layer of the finally cooled oversized H-shaped steel, wherein the temperature of the temperature return is 663 ℃, and finally obtaining the oversized H-shaped steel with the maximum deformation in the horizontal direction less than 6mm and the yield strength of 420 MPa.
The prepared ultra-large H-shaped steel with the yield strength of 420MPa comprises the following chemical components in percentage by weight: c:0.153%, si:0.25%, mn:1.63%, V:0.15%, ti:0.18%, P:0.009%, S:0.009%, al:0.033%, nb:0.028%, the balance being Fe and unavoidable impurities.
The whole dimension of the prepared ultra-large H-shaped steel with the yield strength of 420MPa grade is 1600mm multiplied by 500mm, the flange thickness is 45mm, the flange tempering layer thickness is 4.5mm, the tempering sorbite is adopted as a tempering layer structure (see figure 2), and the ferrite and pearlite are adopted as a core structure (see figure 3).
The prepared ultra-large H-shaped steel with the yield strength of 420MPa has the yield strength of 447MPa, the tensile strength of 562MPa, the elongation of 23.9 percent and the longitudinal impact energy of 51.2J at 0 ℃.
Example 2
A control method for cooling deformation and structural performance of ultra-large H-shaped steel with yield strength of 420MPa level after rolling comprises the following steps:
step 1: the ultra-large H-shaped steel enters ultra-fast cooling equipment for water cooling, the water pressure of the ultra-fast cooling equipment is 1.3MPa, and the water flow of a nozzle at the outer surface of a flange is 3.4m 3 And/h, nozzle water flow at the inner surface of the flange 3.8m 3 And/h, the water flow rate of the nozzle at the lower R angle is 4.3m 3 And/h, nozzle water flow at the lower surface of the web 3.4m 3 And/h. The roller way speed is 1.0m/s, the oversized H-shaped steel is quenched on line, the cooling temperature is 977 ℃, the cooling time is 20s, the final cooling temperature is 342 ℃, and the cooling speed is 29.0 ℃/s, so that the oversized H-shaped steel after final cooling is obtained.
Step 2: and (3) carrying out temperature returning on the finally cooled oversized H-shaped steel, wherein the temperature returning is 621 ℃, and in the subsequent air cooling process, self tempering is carried out on the surface layer of the oversized H-shaped steel, so that the oversized H-shaped steel with the yield strength of 420MPa, the maximum deformation of which is less than 6mm in the horizontal direction, is obtained.
The prepared ultra-large H-shaped steel with the yield strength of 420MPa comprises the following chemical components in percentage by weight: c:0.162%, si:0.29%, mn:1.69%, V:0.16%, ti:0.18%, P:0.008%, S:0.008%, al:0.028%, nb:0.035%, the balance being Fe and unavoidable impurities.
The whole dimension of the prepared ultra-large H-shaped steel with the yield strength of 420MPa grade is 1600mm multiplied by 500mm, the flange thickness is 45mm, the flange tempering layer thickness is 7.0mm, the tempering sorbite is adopted as a tempering layer structure (see figure 4), and the ferrite and pearlite are adopted as a core structure (see figure 5).
The prepared ultra-large H-shaped steel with the yield strength of 420MPa has the yield strength of 482MPa, the tensile strength of 598MPa, the elongation of 23.1 percent and the longitudinal impact energy of 45.6J at 0 ℃.
Example 3
A control method for cooling deformation and structural performance of ultra-large H-shaped steel with yield strength of 420MPa level after rolling comprises the following steps:
step 1: the ultra-large H-shaped steel enters ultra-fast cooling equipment for water cooling, the water pressure of the ultra-fast cooling equipment is 1.2MPa, and the water flow of a nozzle at the outer surface of a flange is 3.3m 3 And/h, nozzle water flow at the inner surface of the flange 3.9m 3 And/h, the water flow rate of the nozzle at the lower R angle is 4.2m 3 And/h, nozzle water flow at the lower surface of the web 3.3m 3 And/h. The roller speed is 0.8m/s,and carrying out online quenching on the oversized H-shaped steel, wherein the opening cooling temperature is 966 ℃, the cooling time is 25s, the final cooling temperature is 315 ℃, and the cooling speed is 24.4 ℃/s, so as to obtain the final-cooled oversized H-shaped steel.
Step 2: and (3) carrying out temperature returning on the finally cooled oversized H-shaped steel, wherein the temperature returning is 581 ℃, and in the subsequent air cooling process, self tempering is carried out on the surface layer of the oversized H-shaped steel, so that the oversized H-shaped steel with the yield strength of 420MPa, wherein the maximum deformation of the oversized H-shaped steel in the horizontal direction is less than 6mm, is obtained.
The prepared ultra-large H-shaped steel with the yield strength of 420MPa comprises the following chemical components in percentage by weight: c:0.16%, si:0.22%, mn:1.70%, V:0.16%, ti:0.20%, P:0.009%, S:0.006%, al:0.036%, nb:0.036% and the balance of Fe and unavoidable impurities.
The whole dimension of the prepared ultra-large H-shaped steel with the yield strength of 420MPa grade is 1600mm multiplied by 500mm, the flange thickness is 45mm, the flange tempering layer thickness is 10mm, the tempering layer structure is tempered sorbite (see figure 6), and the core structure is ferrite and pearlite (see figure 7).
The prepared ultra-large H-shaped steel with the yield strength of 420MPa has the yield strength of 523MPa, the tensile strength of 639MPa, the elongation of 22.4 percent and the longitudinal impact energy of 37.2J at 0 ℃.
Example 4
A control method for cooling deformation and structural performance of ultra-large H-shaped steel with yield strength of 420MPa level after rolling comprises the following steps:
step 1: the ultra-large H-shaped steel enters ultra-fast cooling equipment for water cooling, the water pressure of the ultra-fast cooling equipment is 1.5MPa, and the water flow of the fan-shaped nozzle at the outer surface of the flange is 3.6m 3 /h, fan nozzle water flow at the inner surface of the flange 4.1m 3 /h, the water flow rate of the fan nozzle at the lower R angle is 4.5m 3 /h, fan nozzle water flow at the lower surface of the web 3.8m 3 And (3) carrying out online quenching on the oversized H-shaped steel at the roller way speed of 0.8m/s, wherein the cooling temperature is 978 ℃, the cooling time is 20s, the final cooling temperature is 305 ℃, and the cooling speed is 31.2 ℃/s, so as to obtain the final-cooled oversized H-shaped steel.
Step 2: and (3) carrying out temperature returning on the finally cooled oversized H-shaped steel, wherein the temperature returning is 602 ℃, and in the subsequent air cooling process, self tempering is carried out on the surface layer of the oversized H-shaped steel, so that the oversized H-shaped steel with the yield strength of 420MPa, wherein the maximum deformation of the oversized H-shaped steel in the horizontal direction is less than 6mm, is obtained.
The prepared ultra-large H-shaped steel with the yield strength of 420MPa comprises the following chemical components in percentage by weight: c:0.187%, si:0.30%, mn:1.67%, V:0.18%, ti:0.18%, P:0.008%, S:0.009%, al:0.021%, nb:0.033% and the balance of Fe and unavoidable impurities.
The whole dimension of the prepared ultra-large H-shaped steel with the yield strength of 420MPa grade is 1600mm multiplied by 500mm, the flange thickness is 60mm, the flange tempering layer thickness is 8mm, the tempering layer structure is tempered sorbite (see figure 8), and the core structure is ferrite and pearlite (see figure 9).
The prepared ultra-large H-shaped steel with the yield strength of 420MPa has the yield strength of 517MPa, the tensile strength of 626MPa, the elongation of 22.9 percent and the longitudinal impact energy of 39.6J at 0 ℃.
Comparative example 1
A control method for cooling deformation and structural performance of ultra-large H-shaped steel with yield strength of 420MPa after rolling is similar to that of the embodiment 1, and is different in water flow rate of different parts of the ultra-large H-shaped steel, and comprises the following steps:
step 1: the ultra-large H-shaped steel enters ultra-fast cooling equipment for water cooling, the water pressure of the ultra-fast cooling equipment is 1.2MPa, and the water flow of a nozzle at the outer surface of a flange is 3.3m 3 And/h, nozzle water flow at the inner surface of the flange 3.8m 3 And/h, the water flow rate of the nozzle at the lower R angle is 4.2m 3 And/h, nozzle water flow at the lower surface of the web 4.5m 3 And/h. The roller way speed is 1.2m/s, the ultra-large H-shaped steel with the flange thickness of 45mm is subjected to ultra-rapid cooling, the cooling temperature is 930 ℃, the cooling time is 15s, the final cooling temperature is 352 ℃, and the cooling speed is 38.5 ℃/s, so that the ultra-large H-shaped steel after final cooling is obtained.
Step 2: and the surface layer of the finally cooled oversized H-shaped steel is subjected to temperature returning, and the temperature returning is 641 ℃.
The chemical components of the oversized H-shaped steel are as follows in percentage by weight: c:0.153%, si:0.25%, mn:1.63%, V:0.15%, ti:0.18%, P:0.009%, S:0.009%, al:0.033%, nb:0.028%, the balance being Fe and unavoidable impurities.
The maximum deformation of the ultra-large H-shaped steel with the yield strength of 420MPa in the horizontal direction is 57mm.
The prepared ultra-large H-shaped steel with the yield strength of 420MPa has the yield strength of 425MPa, the tensile strength of 533MPa, the elongation of 21.4 percent and the longitudinal impact energy of 46.1J at 0 ℃.
Comparative example 2
The method for controlling the cooling deformation and the structural performance of the ultra-large H-shaped steel with the yield strength of 420MPa after rolling is similar to the method in the embodiment 1, and is different in that the method for controlling the cooling deformation and the structural performance of the ultra-large H-shaped steel after rolling comprises the following steps:
step 1: and (5) performing air cooling and cooling to room temperature after rolling the oversized H-shaped steel. The flange thickness is 45mm, the cooling temperature is 930 ℃, and the oversized H-shaped steel at room temperature is obtained.
The chemical components of the prepared oversized H-shaped steel are as follows in percentage by weight: c:0.153%, si:0.25%, mn:1.63%, V:0.15%, ti:0.18%, P:0.009%, S:0.009%, al:0.033%, nb:0.028%, the balance being Fe and unavoidable impurities.
The whole dimension of the prepared ultra-large H-shaped steel with the yield strength of 420MPa is 1600mm multiplied by 500mm, the flange thickness is 45mm, and the structures are ferrite and pearlite.
The prepared ultra-large H-shaped steel with the yield strength of 420MPa has the yield strength of 294MPa, the tensile strength of 456MPa, the elongation of 28.8 percent and the longitudinal impact energy of 87.4J at 0 ℃.
Comparative example 3
A control method for cooling deformation and structural performance of ultra-large H-shaped steel with yield strength of 420MPa grade after rolling is similar to that of the embodiment 1, and is different in cooling time after rolling of the ultra-large H-shaped steel, and comprises the following steps:
step 1: the ultra-large H-shaped steel enters ultra-fast cooling equipment for water cooling, the water pressure of the ultra-fast cooling equipment is 1.2MPa, and the water flow of a nozzle at the outer surface of a flange is 3.3m 3 And/h, nozzle water flow at the inner surface of the flange 3.7m 3 And/h, the water flow rate of the nozzle at the lower R angle is 4.2m 3 And/h, nozzle water flow at the lower surface of the web 3.3m 3 And/h. The roller way speed is 1.2m/s, the ultra-large H-shaped steel with the flange thickness of 45mm is subjected to ultra-rapid cooling, and the cooling temperature is 921 DEG CThe cooling time is 35s, the final cooling temperature is 241 ℃, and the cooling speed is 19.4 ℃/s, so that the ultra-large H-shaped steel after final cooling is obtained.
Step 2: and (3) carrying out temperature return on the surface layer of the finally cooled oversized H-shaped steel, wherein the temperature return is 478 ℃.
The chemical components of the prepared oversized H-shaped steel are as follows in percentage by weight: c:0.153%, si:0.25%, mn:1.63%, V:0.15%, ti:0.18%, P:0.009%, S:0.009%, al:0.033%, nb:0.028%, the balance being Fe and unavoidable impurities.
The whole dimension of the prepared ultra-large H-shaped steel with the yield strength of 420MPa is 1600mm multiplied by 500mm, the flange thickness is 45mm, the surface layer structure of the flange is tempered troostite, and the core structure is ferrite and pearlite.
The prepared ultra-large H-shaped steel with the yield strength of 420MPa has the yield strength of 383MPa, the tensile strength of 471MPa, the elongation of 24.6 percent and the longitudinal impact energy of 59.4J at 0 ℃.
Comparative example 4
The control method for the cooling deformation and the structural performance of the ultra-large H-shaped steel with the yield strength of 420MPa after rolling is similar to that of the embodiment 1, and is different in chemical components and percentages of the chemical components are as follows: c:0.27%, si:0.49%, mn:1.72%, V:0.10%, ti:0.12%, P:0.016%, S:0.012%, al:0.017%, nb:0.012%, the balance being Fe and unavoidable impurities.
Step 1: the ultra-large H-shaped steel enters ultra-fast cooling equipment for water cooling, the water pressure of the ultra-fast cooling equipment is 1.2MPa, and the water flow of a nozzle at the outer surface of a flange is 3.3m 3 And/h, nozzle water flow at the inner surface of the flange 3.7m 3 And/h, the water flow rate of the nozzle at the lower R angle is 4.2m 3 And/h, nozzle water flow at the lower surface of the web 3.3m 3 And/h. The roller way speed is 1.2m/s, the ultra-large H-shaped steel with the flange thickness of 45mm is subjected to ultra-rapid cooling, the cooling temperature is 922 ℃, the cooling time is 15s, the final cooling temperature is 362 ℃, and the cooling speed is 37.3 ℃/s, so that the ultra-large H-shaped steel after final cooling is obtained.
Step 2: and (3) carrying out temperature returning on the surface layer of the finally cooled oversized H-shaped steel, wherein the temperature returning is 643 ℃, and finally obtaining the oversized H-shaped steel with the maximum deformation in the horizontal direction of less than 6mm and the yield strength of 420 MPa.
The whole dimension of the prepared ultra-large H-shaped steel with the yield strength of 420MPa is 1600mm multiplied by 500mm, the flange thickness is 65mm, the surface layer structure of the flange is tempered sorbite, and the core structure is ferrite and pearlite.
The prepared ultra-large H-shaped steel with the yield strength of 420MPa has the yield strength of 358MPa, the tensile strength of 459MPa, the elongation of 25.4 percent and the longitudinal impact energy of 62.5J at 0 ℃.
Claims (6)
1. The production method of the ultra-large H-shaped steel with the yield strength of 420MPa is characterized by comprising the following steps:
step 1, performing water cooling on the finish-rolled oversized H-shaped steel, and controlling the deformation of the oversized H-shaped steel by controlling the water flow of different parts of the oversized H-shaped steel to obtain final-cooled oversized H-shaped steel; wherein the water cooling time is 15-25 s;
step 2, generating tempered sorbite after the temperature return phenomenon of the surface layer of the oversized H-shaped steel after final cooling to obtain oversized H-shaped steel with the yield strength of 420MPa, wherein the maximum deformation in the horizontal direction is less than 6mm;
wherein, each component in the oversized H-shaped steel is respectively as follows by mass percent: c:0.15 to 0.20 percent, si:0.22 to 0.35 percent, mn:1.51 to 1.70 percent; v:0.15 to 0.20 percent; ti:0.15 to 0.20 percent; p: less than or equal to 0.012 percent, S: less than or equal to 0.010%, al:0.015 to 0.036 percent, nb:0.028 to 0.046 percent, and the balance of Fe and unavoidable impurities.
2. The method for producing the ultra-large H-shaped steel with the yield strength of 420MPa grade according to claim 1, wherein in the step 1, ultra-fast cooling equipment is adopted to water-cool different positions of the ultra-large H-shaped steel, the water pressure of the ultra-fast cooling equipment is 1.2-1.5 MPa, and the water flow rate of a nozzle at the outer surface of a flange is 3.3-4.1 m 3 And/h, nozzle water flow at the inner surface of the flange is 3.8-4.5 m 3 And/h, the water flow rate of the nozzle at the lower R angle is 4.1-4.6 m 3 And/h, nozzle water flow at the lower surface of the web plate is 3.3-3.8 m 3 /h。
3. The method for producing the ultra-large H-shaped steel with the yield strength of 420MPa grade according to claim 1, wherein in the step 1, the cooling temperature is 950-1000 ℃ in the water cooling process, the water cooling time is 15-25 s, the roller way speed is 0.8-1.2 m/s, the cooling speed is 22.4-46.7 ℃/s, and the final cooling temperature is 300-390 ℃.
4. The method for producing the oversized H-shaped steel with the yield strength of 420MPa grade according to claim 1, wherein in the step 2, the temperature of the oversized H-shaped steel after final cooling is 580-670 ℃.
5. The ultra-large H-shaped steel with the yield strength of 420MPa, which is produced by the method of any one of claims 1 to 4, is characterized in that the yield strength of the ultra-large H-shaped steel after cooling is more than or equal to 420MPa, the tensile strength is more than or equal to 520MPa, the elongation is more than or equal to 20%, the impact energy at the longitudinal 0 ℃ is more than 34J, and the maximum deformation in the horizontal direction is less than 6mm.
6. The ultra-large H-shaped steel with the yield strength of 420MPa according to claim 5, wherein the overall dimension of the ultra-large H-shaped steel with the yield strength of 420MPa is 1600mm multiplied by 500mm, the flange thickness is 40-65 mm, the flange tempering sorbite layer thickness is 4.5-12 mm, and the core structure is ferrite and pearlite structure.
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