CN115418566B - Manufacturing method of low-cost high-P weather-resistant steel - Google Patents
Manufacturing method of low-cost high-P weather-resistant steel Download PDFInfo
- Publication number
- CN115418566B CN115418566B CN202211045026.9A CN202211045026A CN115418566B CN 115418566 B CN115418566 B CN 115418566B CN 202211045026 A CN202211045026 A CN 202211045026A CN 115418566 B CN115418566 B CN 115418566B
- Authority
- CN
- China
- Prior art keywords
- percent
- low
- equal
- manufacturing
- rolling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
-
- 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
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The application discloses a manufacturing method of low-cost high-P weather-resistant steel, which belongs to the field of steel production and comprises the following steps of smelting, continuous casting, rough rolling, induction heating, finish rolling, laminar cooling and coiling, wherein the mass percentages of the chemical components of molten steel are as follows: c:0.01 to 0.06 percent, 0.05 to 0.18 percent of Si, mn:0.10 to 0.28 percent, P:0.10 to 0.15 percent, S: less than or equal to 0.005 percent, cu:0.25 to 0.35 percent of Cr:0.30 to 0.50 percent of Ti:0.03 to 0.06 percent, and the balance being iron and unavoidable impurities; and [%P ] + [%Ti ]. Gtoreq.0.15. Compared with the prior art, the high-strength aluminum alloy can still maintain good strength under the conditions of low Si and low Mn, and excellent processing and forming performances are obtained.
Description
Technical Field
The application relates to a steel manufacturing method, in particular to a manufacturing method of high P weather-resistant steel suitable for hot continuous rolling.
Background
The weather-resistant steel has the characteristics of high-quality steel such as toughness, plastic elongation, forming, welding and cutting, abrasion, high temperature, fatigue resistance and the like, and has been widely used for steel structures such as buildings, vehicles, bridges, towers and the like.
In the prior art, weather-resistant steel is generally realized by adding a large amount of precious alloy elements for improving strength and corrosion resistance, and the cost is high. The element P has the characteristics of good corrosion resistance and low cost, and is valued in the industry in recent years. But P has an adverse effect on the low temperature toughness and cold forming of the steel, while strength, toughness and weldability are important properties of weathering steel. Therefore, in order to improve the strength of the weathering steel on the basis of corrosion resistance, the high-P weathering steel needs relatively high content of Si, mn or other micro-alloy elements in the component proportion, for example, the component of a high-P high-strength high-weather-resistance hot-continuous steel (CN 110284053B) with high Mn design: c:0.04 to 0.07 percent, 0.01 to 0.03 percent of Si, mn:1.50 to 1.70 percent of P:0.11 to 0.13 percent, S: less than or equal to 0.005 percent, cu:0.15 to 0.22 percent, cu+P is less than or equal to 0.34 percent, and the balance is Fe and unavoidable impurities; the yield strength is more than or equal to 450MPa, the tensile strength is 550-700 MPa, and the elongation A is more than or equal to 20%. High Si design, a method for producing weathering steel based on ESP sheet bar continuous casting and rolling process (CN 106367686A) comprises the following components: 0.01 to 0.04 percent of C, 0.30 to 0.60 percent of Si, 0.30 to 0.60 percent of Mn, 0.05 to 0.12 percent of P, 0.25 to 0.45 percent of Cu, 0.30 to 0.80 percent of Cr, less than or equal to 0.30 percent of Ni, less than or equal to 0.01 percent of S and the balance of iron element; yield strength: 380-478Mpa, tensile strength: 459-591MPa, elongation: 25-41%, wherein Mn less than 0.40% results in yield strength less than 400MPa and tensile strength less than 550MPa. A high toughness, high weather resistant steel and a method for producing the same (CN 103695801B) composition: 0.035-0.075% of C, less than or equal to 0.30% of Si, 0.40-0.80% of Mn, 0.07-0.11% of P, less than or equal to 0.004% of S, 0.20-0.50% of Cu, 0.10-0.40% of Ni, 0.40-0.70% of Cr, 0.008-0.016% of Ti, 0.010-0.030% of Nb, less than or equal to 0.0050% of N, 0.001-0.004% of Ca, and the balance of Fe and unavoidable impurities; the yield strength is more than or equal to 355MPa, and the tensile strength is more than or equal to 490MPa.
It can be seen that if the yield strength is kept to be more than or equal to 450MPa, the Mn and Si contents of the prior art cannot be reduced, and the method is not beneficial to cost reduction.
Disclosure of Invention
The technical task of the application is to provide a manufacturing method of low-cost high-P weather-resistant steel aiming at the defects of the prior art. The weather resistance is ensured through high P, and the FeTiP precipitation is realized through controlling the alloy proportion, so that the manufacturing method of the low-cost weather-resistant steel with improved strength is realized.
The technical scheme for solving the technical problems is as follows: a manufacturing method of low-cost high-P weather-resistant steel comprises the following steps: smelting, continuous casting, rough rolling, induction heating, finish rolling, laminar cooling and coiling, and is characterized in that: wherein,,
s1, smelting: the molten steel is obtained, and the molten steel comprises the following chemical components in percentage by mass: c:0.01 to 0.06 percent, 0.05 to 0.18 percent of Si, mn:0.10 to 0.28 percent, P:0.10 to 0.15 percent, S: less than or equal to 0.005 percent, cu:0.25 to 0.35 percent of Cr:0.30 to 0.50 percent of Ti:0.03 to 0.06 percent, and the balance being iron and unavoidable impurities; and [%P ] + [%Ti ]. Gtoreq.0.15;
s2, continuous casting: the thickness of the obtained slab is 70-120mm;
s3, rough rolling: 3 times of rolling are adopted, the intermediate billet is 8-20mm, and the rough rolling outlet temperature is 960-1040 ℃;
s4, induction heating: the temperature of the induction furnace is more than or equal to 1100 ℃;
s5, finish rolling: the temperature of a finish rolling outlet is less than or equal to 850 ℃;
s6, layer cooling: quick cooling after rolling;
s7, coiling: and cooling the coiled material to 550-650 ℃ by laminar flow.
Further, in the above molten steel composition, [% P ]/[% C+% Mn/6 ]. Gtoreq.1.
Further, in the continuous casting step, casting is performed at a draw rate of not less than 4.0 m/min.
Further, the temperature of the induction furnace is 1100-1180 ℃.
Further, in the finish rolling step, the temperature of the finish rolling outlet is 790 to 830 ℃.
Further, after the finish rolling, the thickness of the finished product is 1.2-4.0mm.
In the layer cooling process, the cooling speed is more than or equal to 30 ℃/S.
Compared with the prior art, the application has the following outstanding beneficial effects:
1. according to the application, weather resistance is ensured through high P, the use cost of noble metal alloy is reduced, the corrosion resistance is reliable, and good weather resistance is achieved;
2. under the conditions of low Si and low Mn, feTiP precipitation is realized by controlling alloy proportion to improve strength, the technical defect that the strength cannot be ensured by low Mn in the prior art is overcome, and the following comprehensive performance is stably achieved: the yield strength is more than or equal to 450MPa, the tensile strength is 550-650 MPa, and the elongation A is more than or equal to 20%;
3. the cold forming of the steel plate is greatly improved by controlling the proportion of alloy components and controlling the rolling process, and the steel plate has the characteristics of high strength, excellent forming property, good welding property and the like.
Drawings
FIG. 1 is a scatter plot of P content versus tensile strength of steel.
FIG. 2 is a schematic diagram showing the comparative metallographic structure of example 1 of the present application.
FIG. 3 is the results of the two-way cold roll test of example 1 of the present application.
Detailed Description
The application is further described below in connection with the following detailed description.
For the purposes of the following detailed description, it is to be understood that the application may assume various alternative variations and step sequences, except where expressly specified to the contrary. Furthermore, all numbers expressing, for example, quantities of ingredients used in the specification and claims, other than in any operating example or where otherwise indicated, are to be understood as being modified in all instances by the term "about". At the very least, and not as an attempt to limit the application of the doctrine of equivalents to the scope of the claims, each numerical parameter should at least be construed in light of the number of reported significant digits and by applying ordinary rounding techniques.
Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the application are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. Any numerical value, however, inherently contains certain errors necessarily resulting from the standard deviation found in their respective testing measurements.
It should also be understood that any numerical range recited herein is intended to include all sub-ranges subsumed therein. For example, a range of "1 to 10" is intended to include all subranges between (and including) the stated minimum value of 1 and the stated maximum value of 10, that is, having a minimum value equal to or greater than 1 and a maximum value equal to or less than 10.
In the present application, the use of the singular includes the plural and plural encompasses singular, unless specifically stated otherwise. In addition, in the present application, unless explicitly stated otherwise, the use of "or" means "and/or", even if "and/or" may be explicitly used in some cases. Further, in the present application, the use of "a" or "an" means "at least one" unless specifically stated otherwise. For example, "a" first material, "a" coating composition, etc., refer to one or more of any of these items.
The application provides a manufacturing method of low-cost hot continuous rolling weathering steel, which ensures weather resistance through high P and realizes FeTiP precipitation to improve strength through controlling alloy proportion.
The weather-resistant steel comprises the following chemical components in percentage by mass: c:0.01 to 0.06 percent, 0.05 to 0.18 percent of Si, mn:0.10 to 0.28 percent, P:0.10 to 0.15 percent, S: less than or equal to 0.005 percent, cu:0.25 to 0.35 percent of Cr:0.30 to 0.50 percent of Ti:0.03 to 0.06 percent, and the balance of iron and unavoidable impurities. And [%P ]/[%C+% Mn/6] is not less than 1, [%P ] + [%Ti ]. Gtoreq.0.15. In the optimized scheme, the value of [%P ]/[%C+% Mn/6] is between 1.1 and 1.9, and the sum of [%P ] and [%Ti ] is between 0.4 and 06.
On the basis of high P design, the components of the scheme have the composite effects of low Si and low Mn and Cu, ti and Cr elements, and finally good comprehensive performance is obtained.
C is an element that contributes most to the strength of steel. However, as the carbon content increases, the plasticity and weldability decrease, the low content of C increases the transformation temperature, and more substructures are produced and retained during rolling, which can reduce the deterioration of toughness due to P segregation at coarse grain boundaries to some extent. The content of C is controlled to be 0.01-0.06%, preferably 0.02-0.05% by experimental study in the application.
Si is added as a reducing agent and a deoxidizing agent in the steelmaking process, which is beneficial to increasing the strength and the yield point of steel, but under the condition of high P, the Si promotes the increase of the internal segregation degree of a plate blank, seriously worsens the internal quality of the steel plate, worsens the welding performance of the steel and is unfavorable for low-temperature toughness. Therefore, the Si content is controlled to be 0.05-0.18% in the present application.
Mn is an important solid solution strengthening element. Has important influence on the strength and toughness of steel. The maximum effect of Mn is to improve the hardenability of steel and also an important solid solution strengthening element, so that the strength and hardness of ferrite austenite can be improved. If the Mn content is low, the steel plate grains are coarse, the strength of the steel for designing the low carbon component cannot be ensured, and the problem of cost reduction in the prior art is also solved. And when the Mn content is high, the grains tend to be coarsened and the temper brittleness tends to be increased, which makes processing difficult. Under the condition of high P, mn which is too high can be overlapped to deteriorate the internal quality and low-temperature toughness of the steel plate, and the welding performance is reduced. The application utilizes FeTiP precipitation to improve the strength, so that the application reduces the alloy cost, and the Mn content is controlled to be 0.10-0.28%.
P is one of the most effective alloying elements for improving the atmospheric corrosion resistance of steel, and when P and Cu are added into steel in combination, the P and Cu show better composite effect. However, P has a great damage to the low-temperature impact toughness and weldability of the steel sheet. P is a substitutional solid solution strengthening element, and when P atoms substitute for iron atoms, these atoms cause lattice distortion due to a difference in radius, and the movement of dislocation during deformation is hindered to strengthen the steel sheet. The inventor researches find that the contribution of P to the strength, the action mechanism is related to the quantity, and if the action mechanism is lower than 0.10%, the main strength contribution of P is solid solution strengthening, and FeTiP is not precipitated or the precipitation strengthening effect is not obvious; when the P content is more than or equal to 0.10%, the precipitation of FeTiP can be promoted under the participation of a proper amount of Ti, the strength mutation is improved (figure 1), a large amount of precipitated phases exist in a metallographic structure (the left part of figure 2 is the example 1, and the right part is plain carbon weathering steel), and the precipitated phases are distributed in a grain boundary and a crystal; however, if the content is more than 0.15%, P tends to form a severe segregation band, which deteriorates low-temperature toughness and cold forming. Therefore, the P content is controlled to be 0.10-0.15% in the present application. The promotion of FeTiP precipitation is not only related to the P content but also to the low carbon equivalent, so [%P ]/[%C+%Mn/6 ]. Gtoreq.1 in the present application.
Ti is a strong carbonitride forming element in steel, and TiN and Ti occur in continuous casting and cooling stages 4 C 2 S 2 Liquid precipitation and solid precipitation of particles; tiC and FeTiP are precipitated in the rolling stage and the cooling and coiling stages, and are main elements for improving the strength, so that the steel plate can obtain excellent performance under the comprehensive actions of fine grain strengthening, phase change strengthening and precipitation strengthening. But the TiN particles have larger size and have edges and corners, which can deteriorate cold bending performance and reduce toughness and welding performance of steel. The application promotes the precipitation of FeTiP and improves the strength by controlling the temperature-controlled binding process, so that the Ti content is controlled to be 0.03-0.06% in the application. [% P]+[％Ti]If the ratio is not less than 0.15, insufficient FeTiP precipitation is caused.
In addition, S is used as a harmful inclusion in steel, S is combined with Mn in the steel to form MnS inclusion, and in the hot rolling process, the plasticity of MnS enables the MnS to extend along the rolling direction to form a strip of MnS inclusion along the rolling direction, so that the transverse toughness of the steel plate is seriously damaged; s is also a main element for generating hot shortness in the casting and hot rolling processes. In order to reduce the influence of P on toughness, the S content is controlled to be less than or equal to 0.005%, preferably less than or equal to 0.003%.
The application provides a manufacturing method of low-cost high-P weather-resistant steel. The production method comprises the following steps: smelting, continuous casting, rough rolling, induction heating, finish rolling, laminar cooling and coiling.
S1, smelting
The target component is obtained through molten iron pretreatment, BOF (converter smelting) and LF (LF furnace smelting S removal).
An RH (vacuum deep decarburization) step may be added between BOF and LF.
The molten steel comprises the following chemical components in percentage by mass: c:0.01 to 0.06 percent, 0.05 to 0.18 percent of Si, mn:0.10 to 0.28 percent, P:0.10 to 0.15 percent, S: less than or equal to 0.005 percent, cu:0.25 to 0.35 percent of Cr:0.30 to 0.50 percent of Ti:0.03 to 0.06 percent, and the balance of iron and unavoidable impurities. And [%P ]/[%C+% Mn/6] is not less than 1, [%P ] + [%Ti ]. Gtoreq.0.15.
S2, continuous casting
Casting at a drawing speed of not less than 4.0m/min to obtain a slab with a thickness of 70-120mm.
S3, rough rolling
3 times of rolling are adopted, the intermediate billet is 8-20mm, and the rough rolling outlet temperature is 960-1040 ℃.
S4, induction heating
In order to obtain a target tissue and fully exert the action of Ti precipitation strengthening, the temperature of the induction furnace is more than or equal to 1100 ℃, and specifically is 1100-1180 ℃.
S5, finish rolling
The thickness of the finished product is 1.2-4.0mm, and the temperature of a finish rolling outlet is less than or equal to 850 ℃ and is preferably 790-830 ℃ in order to promote the precipitation of FeTiP.
S6, layer cooling
And (3) quick cooling after rolling, wherein the cooling speed is more than or equal to 30 ℃/S. And (5) rapidly cooling after rolling to obtain a fine tissue.
S7, coiling
And cooling the coiled material to 550-650 ℃ by laminar flow.
In order to better compare the formulations of the present application with the prior art, comparative tests were carried out in which examples 1 to 4 employed the chemical composition and process characteristics of the present application. For better comparison, the thickness gauge of each group was set to 1.2-3.5mm.
The chemical compositions (in weight%) of examples 1-4 and comparative examples 1-2 are shown in the following table, with the balance being iron and unavoidable impurities.
Examples 1-4 and comparative examples 1-2 are ESP processes, flow schemes: continuous casting, rough rolling, induction heating, finish rolling, laminar cooling (the cooling strategy is the front section), and coiling.
The main process control parameters are shown in the following table:
all groups are weather-resistant steel with high phosphorus content, and the weather resistance meets the requirements.
The steel properties of each example and comparative example are shown in the following table:
from the data in the table above, examples 1 to 3 stably meet the steel performance requirements (yield strength is not less than 450MPa, tensile strength is 550 to 650MPa, and elongation A is not less than 20%); and through a two-way cold bending test (fig. 3 is example 1, no cracking), the cold workability of the obtained product is proved to be good, and the deterioration caused by high P is overcome.
While comparative examples 1-2 were also designed for high P, the strength was not acceptable as a whole because of the low Mn alone in comparative example 1. The comparative example 2 maintains the original high Mn design, the strength is qualified, but the qualification rate of the bidirectional cold bending test is 96.5 percent, which is obviously lower than 100 percent of the embodiment group, and the product requirement is not met, because a serious segregation zone is formed after the P content is increased, and the cold forming is deteriorated.
It is noted that while the present application has been described in detail with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various modifications can be made therein without departing from the spirit and scope thereof.
Claims (6)
1. A manufacturing method of low-cost high-P weather-resistant steel comprises the following steps: smelting, continuous casting, rough rolling, induction heating, finish rolling, laminar cooling and coiling, and is characterized in that: wherein,,
s1, smelting: the molten steel is obtained, and the molten steel comprises the following chemical components in percentage by mass: c:0.01 to 0.06 percent, 0.05 to 0.18 percent of Si, mn:0.10 to 0.28 percent, P:0.10 to 0.15 percent, S: less than or equal to 0.005 percent, cu:0.25 to 0.35 percent of Cr:0.30 to 0.50 percent of Ti:0.03 to 0.06 percent, and the balance being iron and unavoidable impurities; and [%P ] + [%Ti ]. Gtoreq.0.15, [%P ]/[%C+% Mn/6 ]. Gtoreq.1;
s2, continuous casting: the thickness of the obtained slab is 70-120mm;
s3, rough rolling: 3 times of rolling are adopted, the intermediate billet is 8-20mm, and the rough rolling outlet temperature is 960-1040 ℃;
s4, induction heating: the temperature of the induction furnace is more than or equal to 1100 ℃;
s5, finish rolling: the temperature of a finish rolling outlet is less than or equal to 850 ℃;
s6, layer cooling: quick cooling after rolling;
s7, coiling: laminar cooling to 550-650 ℃ and coiling;
the yield strength of the obtained weathering steel is more than or equal to 450MPa.
2. The method for manufacturing a low-cost high-P weathering steel according to claim 1, characterized in that: in the continuous casting process, casting is carried out at a drawing speed of not less than 4.0 m/min.
3. The method for manufacturing a low-cost high-P weathering steel according to claim 1, characterized in that: the temperature of the induction furnace is 1100-1180 ℃.
4. The method for manufacturing a low-cost high-P weathering steel according to claim 1, characterized in that: in the finish rolling process, the temperature of a finish rolling outlet is 790-830 ℃.
5. The method for manufacturing a low-cost high-P weathering steel according to claim 1, characterized in that: after finish rolling, the thickness of the finished product is 1.2-4.0mm.
6. The method for manufacturing a low-cost high-P weathering steel according to claim 1, characterized in that: in the layer cooling process, the cooling speed is more than or equal to 30 ℃/S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211045026.9A CN115418566B (en) | 2022-08-30 | 2022-08-30 | Manufacturing method of low-cost high-P weather-resistant steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211045026.9A CN115418566B (en) | 2022-08-30 | 2022-08-30 | Manufacturing method of low-cost high-P weather-resistant steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115418566A CN115418566A (en) | 2022-12-02 |
| CN115418566B true CN115418566B (en) | 2023-09-08 |
Family
ID=84200932
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211045026.9A Active CN115418566B (en) | 2022-08-30 | 2022-08-30 | Manufacturing method of low-cost high-P weather-resistant steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115418566B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100815709B1 (en) * | 2006-12-12 | 2008-03-20 | 주식회사 포스코 | High strength cold rolled steel with excellent weatherability and workability and its manufacturing method |
| ES2726767T3 (en) * | 2010-06-03 | 2019-10-09 | Nippon Steel Corp | Steel tube for airbags and a manufacturing process |
| CN106591707A (en) * | 2016-12-20 | 2017-04-26 | 河钢股份有限公司承德分公司 | Titanium-containing low-nickel high-strength weathering steel and production method thereof |
| CN109825767A (en) * | 2019-02-28 | 2019-05-31 | 日照钢铁控股集团有限公司 | It is a kind of based on ESP thin slab continuous casting and rolling production 400MPa grade cupric without nickel container plate and its production method |
| CN113637905B (en) * | 2021-07-28 | 2022-06-17 | 武汉钢铁有限公司 | Low-cost weathering steel for 310MPa cold-rolled automobile and preparation method thereof |
-
2022
- 2022-08-30 CN CN202211045026.9A patent/CN115418566B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN115418566A (en) | 2022-12-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101638719B1 (en) | Galvanized steel sheet and method for manufacturing the same | |
| CN112048681A (en) | 980 MPa-grade high-formability cold-rolled DH steel and preparation method thereof | |
| CN113249648B (en) | 800 MPa-grade hot-base zinc-aluminum-magnesium coating complex-phase steel and preparation method thereof | |
| EP3696292A1 (en) | A high tensile strength galvanized steel sheet with excellent formability and anti-crush properties and method of manufacturing the same | |
| CN113403550A (en) | High-plasticity fatigue-resistant cold-rolled hot-galvanized DH1180 steel plate and preparation method thereof | |
| JP5394306B2 (en) | High-strength steel plate with excellent plating properties and manufacturing method thereof | |
| CN110088347B (en) | Hot-dip galvanized steel sheet having excellent bake hardenability and room-temperature aging resistance, and method for producing same | |
| JP2010512460A (en) | High yield ratio cold rolled steel sheet with excellent weather resistance | |
| KR102200227B1 (en) | Cord rolled steel sheet, hot-dip galvanized steel sheet having good workability, and manufacturing method thereof | |
| CN110578085A (en) | Hot-rolled steel plate with yield strength of 500MPa and atmospheric corrosion resistance | |
| CN114480972A (en) | Thin-specification Ni-free weathering steel produced based on CSP process and production method thereof | |
| KR20150075307A (en) | Ultra-high strength hot-rolled steel sheet with solid diffusion bonding properties, and method for producing the same | |
| KR101038826B1 (en) | High strength hot rolled steel sheet with excellent weather resistance and impact resistance and its manufacturing method | |
| KR20150075306A (en) | Ultra-high strength hot-rolled steel sheet with excellent in bending workability, and method for producing the same | |
| JP7482231B2 (en) | Low carbon, low cost, ultra-high strength multi-phase steel sheet/strip and manufacturing method thereof | |
| CN107109601B (en) | Composite structure steel sheet having excellent formability and method for producing same | |
| KR100925639B1 (en) | High strength cold rolled steel sheet with excellent weather resistance and manufacturing method | |
| CN113737108A (en) | Delay cracking resistant electro-galvanized super-strong dual-phase steel and manufacturing method thereof | |
| WO2013061543A1 (en) | High-tension hot-rolled steel plate and method for manufacturing same | |
| CN115418566B (en) | Manufacturing method of low-cost high-P weather-resistant steel | |
| CN110997963A (en) | Plated steel sheet excellent in surface quality, strength and ductility | |
| KR101560948B1 (en) | High strength multi-matrix hot rolled steel sheet having excellent impact resistance and formability of edge part and method for manufacturing the same | |
| KR102729466B1 (en) | High strength cold_rolled, plated steel sheet for home applicances having excellent homogeneous material properties, and method for manufacturing the same | |
| CN114657479B (en) | Hot-rolled corrosion-resistant steel with thick specification, high strength and excellent low-temperature toughness, and manufacturing method and application thereof | |
| KR101105040B1 (en) | Bevel hardened steel with excellent surface properties and secondary work brittleness and its manufacturing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A manufacturing method of low-cost and high P weathering steel Effective date of registration: 20231215 Granted publication date: 20230908 Pledgee: Rizhao Bank Co.,Ltd. Pledgor: RIZHAO STEEL HOLDING GROUP Co.,Ltd. Registration number: Y2023980072204 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right |