CN111411301A - Weather-resistant steel used as roof, weather-resistant steel plate and preparation method thereof - Google Patents
Weather-resistant steel used as roof, weather-resistant steel plate and preparation method thereof Download PDFInfo
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- CN111411301A CN111411301A CN202010373124.XA CN202010373124A CN111411301A CN 111411301 A CN111411301 A CN 111411301A CN 202010373124 A CN202010373124 A CN 202010373124A CN 111411301 A CN111411301 A CN 111411301A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- 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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—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
- C21D8/0236—Cold rolling
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
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- Mechanical Engineering (AREA)
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- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a weather-resistant steel plate used as a roof and a weather-resistant steel plate, which comprise, by mass, 0.01-0.04% of C, 0.10-0.30% of Si, 0.30-0.50% of Mn, 0-0.015% of P, 0-0.005% of S, 0.30-0.50% of Cu, 0.20-0.40% of Ni, 3.60-4.20% of Cr, 0.02-0.05% of Nb, 0.01-0.03% of Ti, and the balance of Fe and inevitable impurities. The weather-resistant steel is used for a roof, and has excellent atmospheric corrosion resistance. Thereby prolonging the service life of the roof and reducing the maintenance cost and the safety risk of personnel during maintenance. And the weathering steel adopting the components has the advantage that the cost is obviously reduced compared with stainless steel while the atmospheric corrosion resistance is ensured. The invention also discloses a preparation method of the weather-resistant steel plate used as the roof, and the weather-resistant steel plate prepared by the method can obviously improve the effectiveness of atmospheric corrosion resistance of the roof when used as the roof.
Description
Technical Field
The invention relates to the technical field of steel making, in particular to weather-resistant steel for a roof, a weather-resistant steel plate for the roof and a preparation method thereof.
Background
The effectiveness of weather-resistant steel against atmospheric corrosion relative to carbon steel and the economy relative to stainless steel lead the weather-resistant steel to be rapidly developed in various countries in the world and to be widely applied to the fields of buildings, vehicles, containers, bridges and the like. Through research, the total corrosion cost of steel in China, including loss and corrosion prevention investment caused by corrosion, accounts for about 3.34% of GDP in the same year, the total amount of the GDP is over 2.1 trillion RMB, the number of the RMB is far greater than the total loss of natural disasters and various accidents, and the method is equivalent to that 1555-yuan corrosion cost is borne by each Chinese in the same year. Production and manufacturing enterprises cost a lot of expenses and energy each year for replacing and maintaining factory building roofs, and the danger coefficient of overhead operation is high and takes a long time.
In summary, how to effectively solve the problems of high maintenance cost and the like caused by poor corrosion resistance of the roof steel plate is a problem to be solved by the technical personnel in the field at present.
Disclosure of Invention
In view of the above, a first object of the present invention is to provide a weathering steel for roof use which can effectively solve the problem of high maintenance cost due to poor corrosion resistance of a steel sheet for roof use, and a second object of the present invention is to provide a weathering steel sheet for roof use and prevention of preparation thereof.
In order to achieve the first object, the invention provides the following technical scheme:
the weather-resistant steel for the roof comprises, by mass, 0.01-0.04% of C, 0.10-0.30% of Si, 0.30-0.50% of Mn, 0-0.015% of P, 0-0.005% of S, 0.30-0.50% of Cu, 0.20-0.40% of Ni, 3.60-4.20% of Cr, 0.02-0.05% of Nb, 0.01-0.03% of Ti, and the balance Fe and inevitable impurities.
The weather-resistant steel for the roof comprises, by mass, 0.01-0.04% of C, 0.10-0.30% of Si, 0.30-0.50% of Mn, 0-0.015% of P, 0-0.005% of S, 0.30-0.50% of Cu, 0.20-0.40% of Ni, 3.60-4.20% of Cr, 0.02-0.05% of Nb, 0.01-0.03% of Ti, and the balance Fe and inevitable impurities. The weather-resistant steel is adopted to be used as a roof, and the weather-resistant steel has excellent atmospheric corrosion resistance through the composition arrangement. Thereby prolonging the service life of the roof and reducing the maintenance cost and the safety risk of personnel during maintenance. And the weathering steel adopting the components has the advantage that the cost is obviously reduced compared with stainless steel while the atmospheric corrosion resistance is ensured.
The invention also provides a weather-resistant steel plate for a roof, which comprises a steel plate main body and a zinc coating formed on the surface of the steel plate main body, wherein the steel plate main body is the weather-resistant steel with the components as described above. Since the weathering steel has the technical effects, the weathering steel plate also has the corresponding technical effects. Meanwhile, the surface of the steel plate main body is provided with a zinc coating, and zinc is base metal relative to steel, so the zinc coating can be used as a sacrificial anode to play a role in cathodic protection on the steel plate main body. Namely, the effectiveness of atmospheric corrosion resistance of the weather-resistant steel plate is further improved by arranging the zinc coating. Thereby prolonging the service life of the roof and reducing the maintenance cost and the safety risk of personnel during maintenance. And compared with stainless steel, the cost is obviously reduced while the atmospheric corrosion resistance is ensured.
The invention also provides a preparation method of the weather-resistant steel plate for the roof, which comprises the following steps:
s1: converter steelmaking;
s2: RH refining;
s3, L F refining;
s4: continuous casting;
s5: hot rolling;
s6: cold rolling to obtain the weather-resistant steel plate, wherein the weather-resistant steel plate comprises the following components: the alloy comprises, by mass, 0.01-0.04% of C, 0.10-0.30% of Si, 0.30-0.50% of Mn, 0-0.015% of P, 0-0.005% of S, 0.30-0.50% of Cu, 0.20-0.40% of Ni, 3.60-4.20% of Cr, 0.02-0.05% of Nb, 0.01-0.03% of Ti, and the balance of Fe and inevitable impurities;
s6: the weathering steel sheet obtained in S6 was subjected to galvanization.
Preferably, in the above preparation method, during the cold rolling, the reduction rate ranges from 36.8% to 53.8%, and the rolling speed ranges from 100 to 150 m/min.
Preferably, in the above preparation method, during the galvanizing process, the heating temperature is set to a target of 805 ℃, the slow cooling outlet temperature is set to a target of 710 ℃, and the temperature of the zinc pot is set to a target of 460 ℃.
Preferably, in the above preparation method, in the step S1, the converter tapping process is not deoxidized and is not alloyed.
By optimizing the components of the weather-resistant steel plate, the process route of converter steelmaking, RH refining, L F refining, continuous casting, hot rolling and cold rolling is adopted, the effectiveness of resisting atmospheric corrosion of the formed weather-resistant steel plate is improved, meanwhile, the precision galvanizing procedure of the cold-rolled steel plate avoids the formation of a galvanizing coat, and the zinc is base metal relative to the steel, so that the zinc can be used as a sacrificial anode to play a role in protecting the main body of the steel plate.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart illustrating a method for manufacturing a weathering steel sheet for roof according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention discloses weather-resistant steel and a weather-resistant steel plate for a roof and a preparation method thereof, which are used for greatly prolonging the service life of the roof and reducing the risk and cost of roof maintenance.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In one embodiment, the weather-resistant steel for the roof comprises, by mass, 0.01-0.04% of C, 0.10-0.30% of Si, 0.30-0.50% of Mn, 0-0.015% of P, 0-0.005% of S, 0.30-0.50% of Cu, 0.20-0.40% of Ni, 3.60-4.20% of Cr, 0.02-0.05% of Nb, 0.01-0.03% of Ti, and the balance Fe and inevitable impurities.
The industry standard of the atmospheric corrosion resistant steel Q45OEWR1 is that the content ranges of the components are as follows by mass fraction:
c: less than or equal to 0.07 percent; si: less than or equal to 0.50 percent; mn: less than or equal to 1.5 percent; p: less than or equal to 0.020%; s: less than or equal to 0.010 percent; cu: 0.30-0.55%; ni: 0.10-0.65%; cr: 3.00-5.50%; the balance of iron and inevitable impurities.
In the application, the carbon content is lower, and the carbon is unfavorable for atmospheric corrosion resistance of the steel and influences welding, cold brittleness and stamping performance, so that better atmospheric corrosion resistance can be obtained by adopting lower carbon content.
Silicon can significantly improve the elastic limit, yield point and tensile strength of steel. The combination of silicon and chromium can improve the corrosion resistance and oxidation resistance. Manganese can improve the quenching property of steel and the hot working property of steel, but the manganese content is increased, the corrosion resistance of the steel is weakened, and the welding property is reduced.
P, Cu, Cr and Ni are corrosion-resistant elements, and the high corrosion resistance is achieved through the content design and matching of P, Cu, Cr and Ni. And the chromium can improve the oxidation resistance and the corrosion resistance of the steel and can also obviously improve the strength, the hardness and the wear resistance. Nickel improves the strength of the steel while maintaining good ductility and toughness. The nickel has higher corrosion resistance to acid and alkali and has antirust and heat-resisting capabilities at high temperature.
Niobium and titanium are added into the weathering steel as alloy elements, and the structure and the performance of the steel are influenced by grain refinement and precipitation strengthening. Meanwhile, in order to effectively exert the effect of niobium on inhibiting austenite recrystallization, the ultra-fine structure of the ferrite can be obtained within a wider temperature range after the weathering steel is subjected to niobium microalloying by adopting low carbon content, titanium can generate strong precipitation strengthening and medium-degree refining effect, and TiN can effectively prevent austenite grains from growing in the heating process and play a role in refining the austenite grains.
In conclusion, the weather-resistant steel is adopted to be used as a roof, and has excellent atmospheric corrosion resistance through the composition arrangement. Thereby prolonging the service life of the roof and reducing the maintenance cost and the safety risk of personnel during maintenance. And the weathering steel adopting the components has the advantage that the cost is obviously reduced compared with stainless steel while the atmospheric corrosion resistance is ensured.
The weathering steel provided by the invention has good atmospheric corrosion resistance when being used for roof, and the specific composition refers to the following examples.
Example 1:
in this example, the weathering steel for roofing comprises, in mass fraction, 0.02% of C, 0.20% of Si, 0.40% of Mn, 0.01% of P, 0.003% of S, 0.40% of Cu, 0.30% of Ni, 4.00% of Cr, 0.03% of Nb, 0.02% of Ti, and the balance Fe and unavoidable impurities.
Example 2:
in this example, the weathering steel for roofing comprises, in mass fraction, 0.01% of C, 0.30% of Si, 0.30% of Mn, 0.015% of P, 0.005% of S, 0.50% of Cu, 0.40% of Ni, 3.60% of Cr, 0.02% of Nb, 0.01% of Ti, and the balance Fe and unavoidable impurities.
The invention also provides a weather-resistant steel plate for a roof, which comprises a steel plate main body and a zinc coating formed on the surface of the steel plate main body, wherein the steel plate main body is the weather-resistant steel with the components as described above. That is, a steel sheet main body comprising, in mass fraction, 0.01 to 0.04% of C, 0.10 to 0.30% of Si, 0.30 to 0.50% of Mn, 0 to 0.015% of P, 0 to 0.005% of S, 0.30 to 0.50% of Cu, 0.20 to 0.40% of Ni, 3.60 to 4.20% of Cr, 0.02 to 0.05% of Nb, 0.01 to 0.03% of Ti, and the balance of Fe and unavoidable impurities.
Since the weathering steel has the technical effects, the weathering steel plate also has the corresponding technical effects. Meanwhile, the surface of the steel plate main body is provided with a zinc coating, and zinc is base metal relative to steel, so the zinc coating can be used as a sacrificial anode to play a role in cathodic protection on the steel plate main body. Namely, the effectiveness of atmospheric corrosion resistance of the weather-resistant steel plate is further improved by arranging the zinc coating. Thereby prolonging the service life of the roof and reducing the maintenance cost and the safety risk of personnel during maintenance. And compared with stainless steel, the cost is obviously reduced while the atmospheric corrosion resistance is ensured.
The present invention also provides a method for preparing a weather-resistant steel plate for a roof, referring to fig. 1, fig. 1 is a schematic flow chart of a method for preparing a weather-resistant steel plate for a roof according to an embodiment of the present invention, including the following steps:
s1: converter steelmaking;
s2: RH refining;
s3, L F refining;
s4: continuous casting;
s5: hot rolling;
s6: and (3) cold rolling to obtain the weather-resistant steel plate, wherein the weather-resistant steel plate comprises the following components: the alloy comprises, by mass, 0.01-0.04% of C, 0.10-0.30% of Si, 0.30-0.50% of Mn, 0-0.015% of P, 0-0.005% of S, 0.30-0.50% of Cu, 0.20-0.40% of Ni, 3.60-4.20% of Cr, 0.02-0.05% of Nb, 0.01-0.03% of Ti, and the balance of Fe and inevitable impurities;
s7: and galvanizing the weather-resistant steel plate.
And S1-S4, namely, steelmaking is performed according to the process route of converter steelmaking-RH refining-L F refining-continuous casting, specifically, because the component design C is low, a pre-deoxidation process is adopted, deoxidation and alloying are not performed in the converter tapping process, carbon and oxygen in molten steel react by utilizing vacuum in an RH refining furnace after the molten steel is tapped so as to achieve the purpose of reducing the C content, deoxidation is performed after the C content is removed to the minimum, and then the molten steel is fed into a L F furnace for slagging, deep S removal and alloying.
And after continuous casting, hot rolling to obtain the weather-resistant steel plate with the components meeting the component design. Specifically, a casting blank is subjected to hot conveying and hot charging, the charging temperature is less than or equal to 800 ℃, the preheating section is 800-1150 ℃, and the discharging temperature is 1220-1280 ℃; the final pass rolling temperature of rough rolling is more than or equal to 980 ℃; the finishing temperature is 800-860 ℃; the coiling temperature is 580-640 ℃.
And carrying out cold rolling after hot rolling, and carrying out galvanizing after cold rolling. The steel sheet obtains better surface quality and mechanical property through the cold rolling process, and a zinc coating is formed on the surface of the cold-rolled steel sheet through the galvanizing process.
By optimizing the components of the weather-resistant steel plate, the process route of converter steelmaking, RH refining, L F refining, continuous casting, hot rolling and cold rolling is adopted, the effectiveness of resisting atmospheric corrosion of the formed weather-resistant steel plate is improved, meanwhile, the precision galvanizing procedure of the cold-rolled steel plate avoids the formation of a galvanizing coat, and the zinc is base metal relative to the steel, so that the zinc can be used as a sacrificial anode to play a role in protecting the main body of the steel plate.
Specifically, in step S6, the reduction rate of the cold rolling process ranges from 36.8% to 53.8%, and the rolling speed ranges from 100 to 150 m/min. By combining the component design of the weathering steel plate and controlling the reduction and the rolling speed within the above ranges, good cold rolling effect can be obtained.
In addition to the above embodiments, in step S7, the heating temperature is set to the target 805 ℃, the slow cooling outlet temperature is set to the target 710 ℃, and the zinc pot temperature is set to the target 460 ℃. Namely, the target temperature corresponding to each process parameter is respectively set so as to obtain excellent galvanizing effect and ensure the quality of a galvanized layer.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The weather-resistant steel for the roof is characterized by comprising, by mass, 0.01-0.04% of C, 0.10-0.30% of Si, 0.30-0.50% of Mn, 0-0.015% of P, 0-0.005% of S, 0.30-0.50% of Cu, 0.20-0.40% of Ni, 3.60-4.20% of Cr, 0.02-0.05% of Nb, 0.01-0.03% of Ti and the balance Fe and inevitable impurities.
2. A weathering steel sheet for roofing, comprising a steel sheet main body and a zinc coating layer formed on the surface of the steel sheet main body, wherein the steel sheet main body is the weathering steel according to claim 1.
3. A preparation method of a weather-resistant steel plate for a roof is characterized by comprising the following steps:
s1: converter steelmaking;
s2: RH refining;
s3, L F refining;
s4: continuous casting;
s5: hot rolling;
s6: cold rolling to obtain the weather-resistant steel plate, wherein the weather-resistant steel plate comprises the following components: the alloy comprises, by mass, 0.01-0.04% of C, 0.10-0.30% of Si, 0.30-0.50% of Mn, 0-0.015% of P, 0-0.005% of S, 0.30-0.50% of Cu, 0.20-0.40% of Ni, 3.60-4.20% of Cr, 0.02-0.05% of Nb, 0.01-0.03% of Ti, and the balance of Fe and inevitable impurities;
s7: the weathering steel sheet obtained in S6 was subjected to galvanization.
4. The method for preparing weather-resistant steel plate for roof as claimed in claim 3, wherein the rolling reduction range is 36.8% -53.8% and the rolling speed range is 100-150m/min during the cold rolling process.
5. The method of preparing weather-resistant steel sheet for roof use according to claim 3, wherein in the step S1, converter tapping is not deoxidized and is not alloyed.
6. The method for manufacturing a roof weathering steel plate according to any of claims 3 to 5, characterized in that the heating temperature is set to a target of 805 ℃, the slow cooling outlet temperature is set to a target of 710 ℃, and the zinc inlet temperature is set to a target of 460 ℃ during the galvanizing process.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114892095A (en) * | 2022-06-01 | 2022-08-12 | 张家港扬子江冷轧板有限公司 | High-strength weathering steel for thin S450NH carriage and preparation method thereof |
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2020
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| JPH06248409A (en) * | 1993-02-23 | 1994-09-06 | Nippon Steel Corp | Checkered steel plate excellent in workability and corrosion resistance |
| CN101994063A (en) * | 2009-08-18 | 2011-03-30 | 宝山钢铁股份有限公司 | Weathering steel with yield strength of more than 700MPa and manufacturing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114892095A (en) * | 2022-06-01 | 2022-08-12 | 张家港扬子江冷轧板有限公司 | High-strength weathering steel for thin S450NH carriage and preparation method thereof |
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