CN112246864A - Production method of weather-resistant hot-rolled H-shaped steel - Google Patents
Production method of weather-resistant hot-rolled H-shaped steel Download PDFInfo
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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
- B21B1/088—H- or I-sections
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
- B21B37/76—Cooling control on the run-out table
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0269—Cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B2045/0221—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for structural sections, e.g. H-beams
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Abstract
The invention discloses a production method of weather-resistant hot-rolled H-shaped steel, and belongs to the field of metal material production. The invention comprises the following steps: s1, heating the steel billet: the soaking temperature of the blank in the heating furnace is 1220-1260 ℃, and the soaking time is 120-160 min; s2, cogging and pre-rolling: the blank is taken out of the heating furnace and is subjected to cogging pre-rolling of not less than 2 times, a mode of firstly vertical rolling and then flat rolling is adopted, and the pass reduction is not less than 10 mm; the finishing temperature is controlled to be 1050-1150 ℃; s3, spraying water to remove phosphorus; and S4, blowing, cleaning and then performing universal rolling. The method overcomes the defect that the surface defect of the hot-rolled H-shaped steel is easily caused by the pressing-in of the iron scale in the prior art, obviously reduces the residual iron scale on the surface of a rolled piece under the condition of not carrying out large-scale process adjustment, further reduces the occurrence probability of the defect of the weather-resistant hot-rolled H-shaped steel caused by the pressing-in of the iron scale, and improves the primary qualified rate of the surface quality of the product.
Description
Technical Field
The invention relates to the technical field of metal material production, in particular to a production method of weather-resistant hot-rolled H-shaped steel.
Background
In recent years, coating-free weather-resistant hot-rolled H-shaped steel is increasingly adopted in the fields of buildings, bridges, railways and the like, and the requirements on the surface quality of products are higher and higher from the aspects of safety, attractiveness and economy. Because the weathering steel is added with elements such as Cr, Ni, Cu and the like, the compactness of a surface oxidation layer and the binding force with a substrate are enhanced, so that the aim of preventing corrosion from penetrating into the substrate is fulfilled. The water spraying dephosphorization effect in the conventional hot rolling process is greatly limited, and the furnace-generated oxide scales on the surface of the blank are left to the universal rolling stage and are pressed into the matrix in the reciprocating rolling process, so that the defects of pits, trouble and the like are caused, and the appearance of the product is influenced. In addition, for special-purpose products, surface defects need to be polished and welded, and defects with large depth and large area need to be cut to waste, so that the production cost is increased. According to statistics, the ratio of unqualified surface quality caused by pressing in of iron scale in recent weather-resistant hot-rolled H-shaped steel reaches up to 23 percent at most and accounts for 75 percent of the total number of surface quality defects. Along with the higher and higher requirements of the market on the surface quality of products, the judgment standard is further tightened, if the current situation is not changed, the unqualified proportion is greatly improved, and the challenge is brought to efficient production.
Through retrieval, the Chinese patent application number: 2012105192282, the name of invention creation is: the application discloses an H-shaped steel hot rolling production method, which comprises the working procedures of billet heating, high-pressure water dephosphorization, cogging rolling, reversible universal mill rolling and the like, wherein in the step of billet heating, the soaking temperature of a heating furnace is 1250-1320 ℃, and the blank interval in the furnace is 500-1500 mm; 1-3 vertical rolling passes under light reduction are added in the cogging rolling process; the method is characterized in that a compressed gas purging step is added before and after the rolling process of the reversible universal rolling mill, and the application can increase the Fe in the furnace scale by increasing the soaking temperature of the heating furnace and increasing the blank interval in the furnace2O3And Fe3O4And (4) thickness. The furnace-generated iron scale generated by the heating method is in a loose state and is easier to be removed by a high-pressure water dephosphorization device; and the vertical rolling pass is added to remove the rolled piece web plate iron scale, and the surface quality of the finished product is improved. However, there is still a need in the industry for more versatile and efficient production methods, and the pursuit of the quality of hot-rolled H-section steel has not been stopped.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to overcome the defect that surface defects are easily caused by pressing of iron scales into hot-rolled H-shaped steel in the prior art, and provides a production method of weather-resistant hot-rolled H-shaped steel, which is used for remarkably reducing the iron scale residues on the surface of a rolled piece under the condition of not greatly adjusting the process, further reducing the occurrence probability of the defects caused by pressing of the iron scales into the weather-resistant hot-rolled H-shaped steel and improving the primary qualified rate of the surface quality of a product.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention relates to a production method of weather-resistant hot-rolled H-shaped steel, which comprises the following steps:
s1, heating the steel billet: the soaking temperature of the blank in the heating furnace is 1220-1260 ℃, and the soaking time is 120-160 min;
s2, cogging and pre-rolling: the blank is taken out of the heating furnace and is subjected to cogging pre-rolling of not less than 2 times, a mode of firstly vertical rolling and then flat rolling is adopted, and the pass reduction is not less than 10 mm; the finishing temperature is controlled to be 1050-1150 ℃;
s3, spraying water to remove phosphorus;
and S4, blowing, cleaning and then performing universal rolling.
Research shows that the compositions of the furnace scale from the inner layer to the outer layer are FeO and Fe respectively3O4And Fe2O3. The FeO layer at the innermost layer is compact in structure, sticky in property, strong in binding force with a steel substrate and the most difficult to remove; fe3O4The layer structure is relatively loose, the surface layer and the inner layer of the oxide layer are cut, the stress is prevented from concentrating to the inner layer, and the dephosphorization effect is limited; fe2O3The layer tissue is loose and has larger brittleness. Practice of the invention finds that increasing the soaking temperature or prolonging the soaking time promotes the diffusion of O atoms to the substrate, so that the FeO layer is thickened, the binding force between the FeO layer and the substrate is enhanced, and the effects of water spraying dephosphorization and soft pressure oxide layer crushing are reduced. For weather-resistant hot-rolled H-shaped steel, the content of Ni, Cu and Si elements is higher, so that the binding force between an FeO layer and a substrate is further enhanced, and Fe3O4Layer splitting action. At the moment, if a conventional method of firstly spraying water and then crushing is adopted, an FeO layer cannot be effectively removed, a large amount of iron scales are pressed in the cogging rolling stage and cannot be completely blown and swept before universal rolling, and the surface quality of a product is damaged.
The method is carried out in a reverse way, firstly, the soaking temperature of the blank in a heating furnace is reduced, the soaking time is shortened, the thickness of an FeO layer is reduced, then, the water spraying dephosphorization is not carried out, the cogging and the pre-rolling are directly carried out, the vertical rolling and the flat rolling are combined, the FeO layer is mainly stripped and broken, and then, the high-pressure water spraying dephosphorization, the purging and cleaning before the universal rolling and the like are combined, so that the residual iron oxide scale on the surface of the rolled piece is effectively reduced.
Specifically, the soaking temperature is 1220-1260 ℃, the soaking time is 120-160min, and the basic requirements of the production of the weather-resistant hot-rolled H-shaped steel are met on the basis of properly reducing the soaking temperature and the soaking time to reduce the thickness of an FeO layer; the invention discovers that when the temperature is higher than 1260 ℃, and the soaking time is higher than 160min, the thickness of FeO layer is obviously increased, the thickness of FeO layer accounts for more than 60% of the thickness of the whole oxide layer, and the compound formed by Fe and Si is in the state of Fe3O4The layer enrichment degree increases, has further cracked skin and inlayer for the effort of water spray dephosphorization can not be followed the skin and transmitted inboard, and the oxide layer is got rid of the degree of difficulty and is promoted by a wide margin.
Furthermore, the soaking temperature of the blank in the heating furnace in S1 is 1225-1250 ℃, and the soaking time is 125-150 min.
Furthermore, the soaking temperature of the blank in the heating furnace in S1 is 1230-1245 ℃, and the soaking time is 130-140 min.
As shown in FIG. 1, the cross section of the beam blank adopted in the production of the H-shaped steel is divided into two areas, namely a web 100 and a flange 101, H is the inner height of the web 100, H is the overall height of the beam blank, L is the width of the flange 101, t1 is the thickness of the web 100, and t2 is the thickness of the flange 101. The oxide layer has high hardness and poor plasticity, while the matrix has good plasticity at high temperature. The blank is pre-deformed by vertical rolling, the deformation is concentrated in the area of a web plate 100 due to the restriction of a hole pattern, the height h in the web plate 100 is reduced, the thickness t1 is increased, and at the moment, an oxide layer and a matrix which are distributed along the height direction in the web plate 100 form pressure difference on two sides of an interface due to different deformation degrees, so that the stripping of a maintenance layer is promoted; the oxide layer is subjected to compressive stress in the deformation process and is broken due to high brittleness. The billet is then turned to the orientation shown in FIG. 1 for flat pre-rolling, where the deformation is concentrated in the area of the flange 101, the width L of the flange 101 decreases and the thickness t2 increases, stripping and breaking the oxygen distributed in the width direction on both sides of the flange 101And (7) layering. Through at least 2 times of pre-deformation of the first vertical rolling and the second horizontal rolling, the FeO layer which is in direct contact with the matrix is effectively stripped and crushed, and the Fe2O3And Fe3O4The layer is more brittle and is completely broken and loosened. At the moment, most of the oxide layer automatically falls off, only a small amount of FeO layer remains, and the thickness is thin, thereby providing a good foundation for improving the subsequent water spraying dephosphorization effect.
Further, the present invention has found that if the billet is not pre-deformed for at least 2 passes, the oxide layer is not crushed sufficiently, and the oxide layer on the surface of the web 100 or the flange 101 cannot be crushed sufficiently; if the reduction is less than 10mm, the stress difference between the oxide layer and the two sides of the substrate interface is insufficient, the peeling and crushing effects of the oxide layer are reduced, the residual FeO layer is increased, and even the residual Fe is remained3O4The layer increases the difficulty of subsequent phosphorus removal; if the flat rolling is firstly carried out, the outer side of the flange 101 is protruded to be in a small drum shape, when the blank is turned and rolled vertically, the blank is not placed stably due to the small drum shape and small contact area with a roller way, rolling torsion can occur in the pressing-down process, and then subsequent rolling folding or meat cutting is caused, and the performance quality is damaged. The invention finally adopts at least 2 passes of pre-rolling mode of firstly vertical rolling and then flat rolling, and the pass reduction is controlled to be not less than 10 mm.
Furthermore, the blank in the S2 is taken out of the heating furnace and then is pre-rolled for 2 passes including the vertical rolling and the horizontal rolling, and the pass reduction is respectively 13-20mm and 10-14 mm.
Furthermore, the blank in the S2 is taken out of the heating furnace and then is pre-rolled for 3 times in total, wherein the rolling reduction of each pass is 14-18mm, 12-14mm and 10-12 mm.
The finish rolling temperature of cogging and pre-rolling is clearly controlled, practice shows that the brittleness of the FeO layer is increased along with the reduction of the finish rolling temperature, so that the residual FeO layer can be removed in a water spraying dephosphorization stage, and when the temperature is reduced to 1150 ℃, the brittleness of the FeO is obviously increased, and the bonding force between the FeO and a substrate is greatly reduced. When the water spraying pressure reaches 13.0MPa, the oxide layer can be completely removed, which is also a technical level that production line equipment can easily reach. If the finish rolling temperature is lower than 1050 ℃, the temperature of the blank after water spraying and dephosphorization is lower, so that the subsequent rolling deformation resistance is increased rapidly, and the load of a rolling mill is too high; when the final rolling temperature is higher than 1150 ℃, the brittleness of an oxide layer is reduced, the binding force of other matrixes is increased, and the risk of incomplete subsequent phosphorus removal exists.
Further, the finish rolling temperature of cogging and pre-rolling in S2 is controlled to be 1080-1140 ℃.
Further, the finish rolling temperature of cogging pre-rolling in S2 is controlled to be 1100-1135 ℃.
Furthermore, the water spraying pressure in the water spraying dephosphorization stage in S3 is not lower than 13.0MPa, so that the acting force is ensured to be sufficient, the residual FeO layer can be completely removed, and the equipment capacity and the energy consumption are met.
Furthermore, the water spraying pressure of the water spraying dephosphorization stage in S3 is 14.0 MPa-23.0 MPa.
Furthermore, in S4, compressed gas of 0.5 MPa-2.0 MPa is adopted to purge the web part of the rolled piece before universal rolling.
For the production of hot-rolled H-shaped steel, the universal rolling is a main stage of compression deformation of flanges 101 and a web 100 in the thickness direction and also a main stage of generating scale pressing-in defects, a compressed gas purging device is added before the universal rolling, so that the scale scattered on the surface of a rolled piece can be effectively removed, the risk that the broken scale falls on the surface of the web 100, a concave cavity is formed by the flanges 101 on two sides, and the scale cannot fall automatically due to the fact that the rolled piece is long, and then the scale is pressed into a base body is avoided.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) according to the production method of the weather-resistant hot-rolled H-shaped steel, disclosed by the invention, by reducing the soaking temperature of the blank in the heating furnace, shortening the soaking time, combining cogging and pre-rolling, high-pressure water spraying for dephosphorization and universal pre-rolling blowing, the iron oxide scale residue on the surface of a rolled piece is obviously reduced, the occurrence probability of defects caused by iron oxide pressing in the weather-resistant hot-rolled H-shaped steel is further reduced, and the primary qualified rate of product surface quality inspection is increased.
Drawings
Fig. 1 is a schematic cross-sectional structure of a preform.
The reference numerals in the schematic drawings illustrate:
100. a web; 101. and (4) flanges.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The present invention will be further described with reference to the following examples.
Example 1
The production method of the weather-resistant hot-rolled H-shaped steel comprises the following steps:
s1, heating the steel billet: soaking the blank in a heating furnace at 1260 ℃ for 150 min;
s2, cogging and pre-rolling: the blank is taken out of the heating furnace and is subjected to cogging and pre-rolling for 3 times, and the rolling reduction of each time is 18mm, 14mm and 12mm by adopting a vertical rolling-flat rolling mode; the finishing temperature is controlled to be 1140 ℃;
s3, spraying water to remove phosphorus; the water spraying pressure is 23 MPa.
And S4, after purging and cleaning, universal rolling is carried out, and before universal rolling, 2.0MPa compressed gas is used for purging the web part of the rolled piece.
By practice, the method of the embodiment is adopted, the one-time qualified rate of the surface quality of the product reaches 99%, and the yield strength level of the product reaches 355 MPa.
Example 2
The production method of the weather-resistant hot-rolled H-shaped steel comprises the following steps:
s1, heating the steel billet: soaking the blank in a heating furnace at 1250 ℃ for 160 min;
s2, cogging and pre-rolling: the blank is taken out of the heating furnace and is subjected to cogging and pre-rolling for 3 times, and the rolling reduction of each time is 16mm, 12mm and 10mm by adopting a vertical rolling-flat rolling mode; the finishing temperature is controlled to be 1089 ℃;
s3, spraying water to remove phosphorus; the water spraying pressure is 22 MPa;
and S4, after purging and cleaning, universal rolling is carried out, and before universal rolling, 1.7MPa compressed gas is used for purging the web part of the rolled piece.
By practice, the method of the embodiment is adopted, the one-time qualified rate of the surface quality of the product reaches 96%, and the yield strength level of the product reaches 450 MPa.
Example 3
The production method of the weather-resistant hot-rolled H-shaped steel comprises the following steps:
s1, heating the steel billet: soaking the blank in a heating furnace at 1241 deg.C for 140 min;
s2, cogging and pre-rolling: the blank is taken out of the heating furnace and is subjected to cogging and pre-rolling for 3 times, and the rolling reduction of each time is 14mm, 12mm and 10mm by adopting a vertical rolling-flat rolling mode; the finishing temperature is controlled to 1050 ℃;
s3, spraying water to remove phosphorus; the water spraying pressure is 22 MPa;
and S4, after purging and cleaning, universal rolling is carried out, and before universal rolling, 1.5MPa compressed gas is used for purging the web part of the rolled piece.
By practice, the method of the embodiment is adopted, the one-time qualified rate of the surface quality of the product reaches 98%, and the yield strength level of the product reaches 355 MPa.
Example 4
The production method of the weather-resistant hot-rolled H-shaped steel comprises the following steps:
s1, heating the steel billet: soaking the blank in a heating furnace at 1245 deg.C for 143 min;
s2, cogging and pre-rolling: the blank is taken out of the heating furnace and is subjected to cogging and pre-rolling for 3 times, and the rolling reduction of each time is 14mm, 12mm and 10mm by adopting a vertical rolling-flat rolling mode; the finishing temperature is controlled to be 1092 ℃;
s3, spraying water to remove phosphorus; the water spraying pressure is 22 MPa;
and S4, after purging and cleaning, universal rolling is carried out, and before universal rolling, 1.4MPa compressed gas is used for purging the web part of the rolled piece.
By practice, the method of the embodiment is adopted, the one-time qualified rate of the surface quality of the product reaches 97%, and the yield strength level of the product reaches 450 MPa.
Example 5
The production method of the weather-resistant hot-rolled H-shaped steel comprises the following steps:
s1, heating the steel billet: the soaking temperature of the blank in the heating furnace is 1240 ℃, and the soaking time is 125 min;
s2, cogging and pre-rolling: the blank is taken out of the heating furnace and is subjected to cogging and pre-rolling for 2 times, and the rolling reduction of each time is 20mm and 14mm by adopting a vertical rolling-flat rolling mode; the finishing temperature is controlled to 1150 ℃;
s3, spraying water to remove phosphorus; the water spraying pressure is 20 MPa;
and S4, blowing, cleaning, and then performing universal rolling, wherein a web part of the rolled piece is blown by 0.8MPa compressed gas before universal rolling.
By practice, the method of the embodiment is adopted, the one-time qualified rate of the surface quality of the product reaches 98%, and the yield strength level of the product reaches 355 MPa.
Example 6
The production method of the weather-resistant hot-rolled H-shaped steel comprises the following steps:
s1, heating the steel billet: soaking the blank in a heating furnace at 1242 deg.C for 130 min;
s2, cogging and pre-rolling: the blank is taken out of the heating furnace and is subjected to cogging and pre-rolling for 2 times, a vertical rolling-flat rolling mode is adopted, and the pass rolling reduction is respectively 16mm and 14 mm; the finishing temperature is controlled to be 1135 ℃;
s3, spraying water to remove phosphorus; the water spraying pressure is 20 MPa;
and S4, blowing, cleaning, and then performing universal rolling, wherein a web part of the rolled piece is blown by 0.8MPa compressed gas before universal rolling.
By practice, the method of the embodiment is adopted, the one-time qualified rate of the surface quality of the product reaches 97%, and the yield strength level of the product reaches 450 MPa.
Example 7
The production method of the weather-resistant hot-rolled H-shaped steel comprises the following steps:
s1, heating the steel billet: soaking the blank in a heating furnace at 1235 ℃ for 129 min;
s2, cogging and pre-rolling: the blank is taken out of the heating furnace and is subjected to cogging and pre-rolling for 2 times, a vertical rolling-flat rolling mode is adopted, and the pass rolling reduction is respectively 18mm and 13 mm; the finishing temperature is controlled to be 1100 ℃;
s3, spraying water to remove phosphorus; the water spraying pressure is 18 MPa;
and S4, blowing, cleaning, and then performing universal rolling, wherein a web part of the rolled piece is blown by 0.8MPa compressed gas before universal rolling.
By practice, the method of the embodiment is adopted, the one-time qualified rate of the surface quality of the product reaches 98%, and the yield strength level of the product reaches 355 MPa.
Example 8
The production method of the weather-resistant hot-rolled H-shaped steel comprises the following steps:
s1, heating the steel billet: soaking the blank in a heating furnace at 1230 ℃ for 133 min;
s2, cogging and pre-rolling: the blank is taken out of the heating furnace and is subjected to cogging and pre-rolling for 2 times, a vertical rolling-flat rolling mode is adopted, and the pass rolling reduction is respectively 18mm and 13 mm; the finishing temperature is controlled to be 1096 ℃;
s3, spraying water to remove phosphorus; the water spraying pressure is 17 MPa;
and S4, blowing, cleaning, and then performing universal rolling, wherein a web part of the rolled piece is blown by 0.8MPa compressed gas before universal rolling.
By practice, the method of the embodiment is adopted, the one-time qualified rate of the surface quality of the product reaches 96%, and the yield strength level of the product reaches 450 MPa.
Example 9
The production method of the weather-resistant hot-rolled H-shaped steel comprises the following steps:
s1, heating the steel billet: soaking the blank in the heating furnace at 1225 deg.C for 135 min;
s2, cogging and pre-rolling: the blank is taken out of the heating furnace and is subjected to cogging and pre-rolling for 2 times, and the pass rolling reduction is respectively 13mm and 11mm by adopting a vertical rolling-flat rolling mode; the finishing temperature is controlled to be 1087 ℃;
s3, spraying water to remove phosphorus; the water spraying pressure is 14 MPa;
and S4, blowing, cleaning, and then performing universal rolling, wherein a web part of the rolled piece is blown by 0.6MPa compressed gas before universal rolling.
By practice, the method of the embodiment is adopted, the one-time qualified rate of the surface quality of the product reaches 96%, and the yield strength level of the product reaches 355 MPa.
Example 10
The production method of the weather-resistant hot-rolled H-shaped steel comprises the following steps:
s1, heating the steel billet: soaking the blank in a heating furnace at 1220 ℃ for 120 min;
s2, cogging and pre-rolling: the blank is taken out of the heating furnace and is subjected to cogging and pre-rolling for 2 times, and the pass rolling reduction is respectively 13mm and 10mm by adopting a vertical rolling-flat rolling mode; the finishing temperature is controlled to be 1080 ℃;
s3, spraying water to remove phosphorus; the water spraying pressure is 13 MPa;
and S4, blowing, cleaning, and then performing universal rolling, wherein a web part of the rolled piece is blown by 0.5MPa compressed gas before universal rolling.
By practice, the method of the embodiment is adopted, the one-time qualified rate of the surface quality of the product reaches 95%, and the yield strength level of the product reaches 450 MPa.
As shown in the following tables 1 and 2, which are tables of main process parameter information of the above examples, it can be seen that, for producing weather-resistant hot-rolled H-shaped steel with flanges 101 and 102 having a thickness of 16-50mm, the first pass yield of the surface quality inspection can be remarkably improved by the method of the above examples, and the pass yield is improved from less than 80% on average to more than 95%. The above embodiments show specifications that cover the current market demand and are therefore representative.
TABLE 1 Main Process parameters of examples 1 to 10 of the present invention
TABLE 2 Effect of examples 1 to 10 of the present invention
Comparative example 1
The comparative example is basically the same as the example 1 except that the soaking temperature is 1300 ℃ and the soaking time is 180min in the billet heating stage in the comparative example, and the primary qualified rate of the surface quality of the finally obtained product is 86%.
Comparative example 2
The comparative example is basically the same as the example 3 except that in the comparative example, one-pass pre-rolling is adopted in the cogging pre-rolling stage, the reduction rate is 5mm, and the primary qualified rate of the surface quality of the finally obtained product is 89%.
Comparative example 3
The comparison example is basically the same as the example 5 in the production of the weather-resistant hot-rolled H steel, except that compressed air blowing is not adopted before universal rolling in the comparison example, and the first-pass yield of the surface quality of the finally obtained product is 93%.
Comparative example 4
The comparison example is basically the same as the example 7 in the production of the weather-resistant hot-rolled H steel, except that the water spraying dephosphorization pressure in the comparison example is 10MPa, and the first-pass yield of the surface quality of the finally obtained product is 90%.
Comparative example 5
The comparative example was substantially the same as example 9 except that cogging pre-rolling was not performed, and the primary pass rate of the surface quality of the final product was 79%.
As shown in table 3 below, the process parameter information of the above comparative example shows that the object of effectively improving the surface quality of the product cannot be achieved.
TABLE 3 comparative examples with out-going process parameters according to the invention
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (10)
1. A production method of weather-resistant hot-rolled H-shaped steel is characterized by comprising the following steps: the method comprises the following steps:
s1, heating the steel billet: the soaking temperature of the blank in the heating furnace is 1220-1260 ℃, and the soaking time is 120-160 min;
s2, cogging and pre-rolling: the blank is taken out of the heating furnace and is subjected to cogging pre-rolling of not less than 2 times, a mode of firstly vertical rolling and then flat rolling is adopted, and the pass reduction is not less than 10 mm; the finishing temperature is controlled to be 1050-1150 ℃;
s3, spraying water to remove phosphorus;
and S4, blowing, cleaning and then performing universal rolling.
2. The method for producing a weather-resistant hot-rolled H-shaped steel according to claim 1, wherein: in S1, the soaking temperature of the blank in the heating furnace is 1225-1250 ℃, and the soaking time is 125-150 min.
3. The method for producing a weather-resistant hot-rolled H-shaped steel according to claim 1, wherein: in S1, the soaking temperature of the blank in the heating furnace is 1230-1245 ℃, and the soaking time is 130-140 min.
4. The method for producing a weather-resistant hot-rolled H-shaped steel according to claim 1, wherein: and (3) after the blank in the S2 is taken out of the heating furnace, carrying out pre-rolling for 2 passes including vertical rolling and horizontal rolling, wherein the pass reduction is respectively 13-20mm and 10-14 mm.
5. The method for producing a weather-resistant hot-rolled H-shaped steel according to claim 1, wherein: and (3) after the blank in the S2 is taken out of the heating furnace, carrying out pre-rolling for 3 passes in total, wherein the pass reduction is 14-18mm, 12-14mm and 10-12mm respectively.
6. The method for producing a weather-resistant hot-rolled H-shaped steel according to claim 1, wherein: the finish rolling temperature of cogging and pre-rolling in S2 is controlled to be 1080-1140 ℃.
7. The method for producing a weather-resistant hot-rolled H-shaped steel according to claim 1, wherein: the finishing temperature of cogging and pre-rolling in S2 is controlled to be 1100-1135 ℃.
8. The method for producing a weather-resistant hot-rolled H-section steel according to any one of claims 1 to 7, wherein: and the water spraying pressure of the water spraying dephosphorization stage in the S3 is not lower than 13.0 MPa.
9. The method for producing a weather-resistant hot-rolled H-section steel according to claim 8, wherein: the water spraying pressure of the water spraying dephosphorization stage in S3 is 14.0 MPa-23.0 MPa.
10. The method for producing a weather-resistant hot-rolled H-section steel according to any one of claims 1 to 7, wherein: and in S4, compressed gas of 0.5-2.0 MPa is adopted to purge the web part of the rolled piece before universal rolling.
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