CN110699602A - Cold-rolled weathering steel based on cover-type annealing process and manufacturing method thereof - Google Patents
Cold-rolled weathering steel based on cover-type annealing process and manufacturing method thereof Download PDFInfo
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- CN110699602A CN110699602A CN201911103678.1A CN201911103678A CN110699602A CN 110699602 A CN110699602 A CN 110699602A CN 201911103678 A CN201911103678 A CN 201911103678A CN 110699602 A CN110699602 A CN 110699602A
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- 238000000137 annealing Methods 0.000 title claims abstract description 28
- 230000008569 process Effects 0.000 title claims abstract description 27
- 229910000870 Weathering steel Inorganic materials 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 238000003672 processing method Methods 0.000 title description 2
- 238000000034 method Methods 0.000 claims abstract description 28
- 238000005096 rolling process Methods 0.000 claims abstract description 21
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 8
- 239000000956 alloy Substances 0.000 claims abstract description 8
- 239000000126 substance Substances 0.000 claims abstract description 7
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 229910052802 copper Inorganic materials 0.000 claims abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 6
- 239000002253 acid Substances 0.000 claims abstract description 5
- 238000005098 hot rolling Methods 0.000 claims abstract description 5
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 5
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims abstract description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 52
- 239000010959 steel Substances 0.000 claims description 52
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 11
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 230000002441 reversible effect Effects 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 claims description 3
- 238000005097 cold rolling Methods 0.000 claims description 3
- 238000005238 degreasing Methods 0.000 claims description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- 238000005275 alloying Methods 0.000 claims description 2
- 238000005452 bending Methods 0.000 claims description 2
- 238000005266 casting Methods 0.000 claims description 2
- 238000009749 continuous casting Methods 0.000 claims description 2
- 230000002708 enhancing effect Effects 0.000 claims description 2
- 239000013072 incoming material Substances 0.000 claims description 2
- 238000004806 packaging method and process Methods 0.000 claims description 2
- 230000009467 reduction Effects 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 239000011593 sulfur Substances 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 abstract description 9
- 230000007797 corrosion Effects 0.000 abstract description 9
- 238000003466 welding Methods 0.000 abstract description 5
- 239000000203 mixture Substances 0.000 abstract description 4
- 239000010949 copper Substances 0.000 description 7
- 239000011651 chromium Substances 0.000 description 6
- 239000011572 manganese Substances 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 206010057040 Temperature intolerance Diseases 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000008543 heat sensitivity Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- 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
- C21D8/0221—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
-
- 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
- C21D8/0242—Flattening; Dressing; Flexing
-
- 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
- C22C38/04—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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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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- 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 Sheet Steel (AREA)
Abstract
The invention discloses cold-rolled weathering steel based on a cover-type annealing process and a manufacturing method thereof, wherein the cold-rolled weathering steel comprises the following chemical components in percentage by weight: c: 0.6-0.10%, Si: 0.25 to 0.45%, Mn: 0.35-0.50%, P: 0.080-0.120%, S: less than or equal to 0.015 percent, Als: 0.008-0.030%, Ni: 0.12 to 0.20%, Cu: 0.25-0.30%, Cr: 0.30-0.50%, N: less than or equal to 0.0080 percent, and the balance of Fe and inevitable impurities. Through reasonable chemical composition design, hot rolling process control, acid rolling process and cover annealing process, the invention obtains the alloy with surface quality grade above FB level, excellent plate shape, material yield strength higher than 310-350 MPa, tensile strength higher than 450-500 MPa, yield ratio less than or equal to 0.75, excellent stamping forming performance, excellent welding performance and excellent atmospheric corrosion resistance.
Description
Technical Field
The invention belongs to the field of metal materials, and particularly relates to a method for producing cold-rolled weathering steel based on a cover-type annealing process.
Background
The atmospheric corrosion resistant steel plate is also called weather resistant steel, has wide application, and is mainly used in the industries of railway carriages, highway protective guards, steel for bridge structures, containers of ships and the like. The weathering steel plate is required to have not only a certain corrosion resistance but also a higher strength and better weldability. Since hot-rolled weathering steel sheets are widely used for structural purposes, but as society develops, steel for cars, containers and partial structural purposes needs to be lightweight and stamped into parts having a complicated shape, there is an increasing demand for cold-rolled weathering steel sheets.
The patent publication No. CN106636897A is a low-alloy weather-resistant steel plate, and the preparation method and application thereof, the patent mainly reduces the use of high-cost alloy elements Cr and Ni by improving low-cost Si elements, and achieves good corrosion resistance and mechanical property by a hot rolling process. The yield strength of the weathering steel prepared by the method provided by the patent is more than or equal to 422MPa, the tensile strength is more than or equal to 528MPa, the elongation is more than or equal to 28.8, and the patent also only provides a manufacturing method of the hot-rolled weathering steel plate, and is not suitable for cold-rolling weathering; the ultrahigh-strength cold-rolled weather-resistant steel plate with the domestic patent publication number of CN101376950A and the manufacturing method thereof have the advantages that the yield strength of the produced steel plate is 700-1000 MPa, the tensile strength is 800-1070 MPa, and the elongation is only 5-14%.
Along with the development of domestic high-speed railways, the steel for the shell of the motor car carriage is more and more in demand, the carriage top beam needs to be stamped into a beam by using cold-rolled weather-resistant steel, and cracks often appear in the actual stamping process, so that certain forming performance, namely a lower yield ratio, is needed when the cold-rolled weather-resistant steel is stamped into a roof trabecula, and the stamping forming is convenient, but the weather-resistant steel needs to be added with micro-alloy elements such as Cu, P, Ni and the like to improve the weather resistance, and because micro-alloys are added, the normally prepared cold-rolled weather-resistant steel has higher strength, poorer forming performance and higher yield ratio, and related reports known at present all adopt a continuous annealing mode; the heat preservation time of the cover annealing is longer, about 30-40h is usually needed, the surface of the steel plate is easy to bond due to the stacking annealing, the surface quality is poor, the shape of the steel plate is easy to bend, and the stamping quality is influenced in the subsequent stamping process.
Disclosure of Invention
Compared with the prior art, the invention provides cold-rolled weathering steel based on the cover annealing process and a manufacturing method thereof, and the problems of bonding, buckling and the like easily occurring in the cover annealing process are solved through reasonable chemical composition design, hot rolling process control, acid rolling, cover annealing process and wet leveling process.
The cold-rolled weathering steel based on the cover-type annealing process is characterized by comprising the following chemical components in percentage by weight: c: 0.6-0.10%, Si: 0.25 to 0.45%, Mn: 0.35-0.50%, P: 0.080-0.120%, S: less than or equal to 0.015 percent, Als: 0.008-0.030%, Ni: 0.12 to 0.20%, Cu: 0.25-0.30%, Cr: 0.30-0.50%, N: less than or equal to 0.0080 percent, and the balance of Fe and inevitable impurities.
In order to ensure the plate shape control and the mechanical property of the cold-rolled weather-resistant steel plate for the bullet train, the invention is mainly based on the following principles:
1) c, carbon C: the steel is the most economic strengthening element of the steel grade, the strength of the steel is improved mainly through solid solution strengthening and precipitation strengthening, but the strength of the steel plate is obviously improved along with the increase of the carbon content, but the plasticity is obviously reduced. While too high a carbon content in the alloy steel deteriorates the weldability of the steel.
2) Silicon Si: the silicon element can be used as a reducing agent and a deoxidizing agent to be added into the steel in the smelting process, the hardenability and the tempering resistance of the steel can be improved by the silicon element, the overall corrosion resistance rate of the steel plate can be reduced by the increase of the Si element, the weather resistance of the steel can be effectively improved by matching with Cu and Cr in the steel, the atmospheric corrosion resistance is improved, but the low-temperature toughness and the welding performance of the steel can be reduced by excessively high Si content.
3) Manganese Mn: as a commonly used desulfurization and deoxidation element, the alloy can prevent hot brittleness and welding hot cracks caused by FeS, can be infinitely dissolved in ferrite and austenite, improves the strength of a steel plate, reduces the transformation critical temperature of the steel plate, refines a pearlite structure and improves toughness. However, excessive Mn causes coarsening of crystal grains, resulting in temper brittleness and increased heat sensitivity of the steel.
4) Phosphorus P: the atmospheric corrosion resistance of the steel sheet can be improved, but P is likely to be segregated, thereby reducing the plasticity, low-temperature toughness and weldability of the steel.
5) Copper Cu: a barrier layer mainly comprising Cu and P can be formed between the substrate and the rust layer, and is firmly combined with the substrate to have good protection on the steel plate. However, excessive Cu addition causes a problem of "Cu brittleness".
6) Chromium Cr: the method can form a compact oxide film on the surface of the steel plate to improve the passivation capability of the steel plate, and the effect is more obvious when Cr is combined with Cu.
7) Nickel Ni: has the effects of strengthening the solid solution of the steel plate and improving the hardenability. Meanwhile, Ni can refine ferrite grains, improve the toughness of the steel plate, increase the stability of the steel plate and improve the corrosion resistance of the steel plate.
A manufacturing method of cold-rolled weathering steel based on a cover annealing process comprises the following steps:
1) pretreating molten iron: pre-slagging and post-slagging are required; the target sulfur content after molten iron desulphurization is less than 0.015 percent
2) Smelting in a converter: enhancing slag stopping operation; deoxidation alloying is needed during tapping;
3) alloy fine adjustment station: reducing the top slag of the steel ladle;
4) and (4) LF furnace: weakly stirring before and after Ca feeding, wherein the stirring time is not less than 11 min;
5) continuous casting: the target temperature of the tundish is controlled to be 20-40 ℃ above the liquidus temperature, and the casting blank needs to be checked in time and cleaned if necessary;
6) controlling a hot rolling process:
tapping temperature: 1230-1270 ℃; firstly, rough rolling is carried out by two-roller reversible rough rolling and four-roller reversible rough rolling to reach the target thickness, then the rough rolling is carried out by 7-frame hot continuous rolling, a finishing mill is provided with a working roller shifting system and a working roller bending system, the convexity and wedge shape of the plate shape are controlled, and the convexity is required: c40 is more than or equal to 20 mu m and less than or equal to 60 mu m, and the wedge requirement is as follows: the | W40| is less than or equal to 40 μm;
the finishing temperature is as follows: 880 to 910 ℃;
coiling temperature: the coiling temperature is 600-640 ℃, and the mechanical property and the surface oxygen pressure condition of the hot rolled plate can be influenced if the coiling temperature is too high or too low;
7) cold rolling: the total reduction rate of the five-stand cold continuous rolling is 40-60 percent;
8) cover type annealing process: acid rolling incoming material → electrolytic degreasing → cover annealing → wet flattening → coiling packaging.
Wherein the cold spot temperature in the hood annealing temperature is as follows: 670 to 690 ℃; annealing the sealing gas in a full hydrogen mode;
wet temper rolling elongation is as required in Table 1 below
TABLE 1 Flat elongation
| Thickness/mm | Percent flat elongation/%) |
| ＜0.8 | 0.6～0.9 |
| ≥0.8～＜1.0 | 0.7～1.0 |
| ≥1.0～＜1.2 | 0.9～1.2 |
| ≥1.2～＜1.6 | 1.0～1.3 |
| ≥1.6 | 1.1～1.4 |
The flattening process can eliminate a yield platform and solve the plate shape problems of steel plate wrinkling and the like, and meanwhile, the method adopts a wet flattening process, has small rolling force, can clean the surfaces of the roller and the strip steel through blowing and sweeping, and improves the smoothness of the surface of the strip steel.
Compared with the prior art, the invention has the beneficial effects that:
the cold-rolled weather-resistant steel obtained by the invention has the advantages of high surface quality grade FB level, excellent plate shape, material yield strength higher than 310-350 MPa, tensile strength higher than 450-500 MPa and yield ratio less than or equal to 0.75, excellent stamping forming performance, excellent welding performance and excellent atmospheric corrosion resistance.
Detailed Description
The technical solution of the present invention will be described below by way of specific examples.
To realize the cold-rolled weather-resistant steel sheet mentioned in this patent, the following examples are given:
table 1 shows the chemical composition of each set of examples, with the balance being inevitable impurities and Fe.
TABLE 1 chemical composition Table for each set of examples
After the molten steel of each group of examples in the table is continuously cast, the molten steel is subjected to processes such as seven-frame hot continuous rolling, acid pickling, five-frame full six-roller cold continuous rolling, electrolytic degreasing, cover annealing, wet leveling and the like, the main process parameters are shown in table 2, and the final performance is shown in table 3.
TABLE 2 production Process parameters
The properties of each example are shown in table 3.
TABLE 3 mechanical Properties of the examples
As can be seen from the above examples, the cold-rolled weather-resistant steel plate produced by the invention has the yield strength of 310 MPa-350 MPa, the tensile strength of 450 MPa-500 MPa, the yield ratio of less than or equal to 0.75, excellent stamping formability, and good welding performance and atmospheric corrosion resistance.
The above description is only for specific exemplary description of the present invention, and it should be noted that the specific implementation of the present invention is not limited by the above manner, and it is within the protection scope of the present invention as long as various insubstantial modifications are made by using the technical idea and technical solution of the present invention, or the technical idea and technical solution of the present invention are directly applied to other occasions without modifications.
Claims (7)
1. The cold-rolled weathering steel based on the cover-type annealing process is characterized by comprising the following chemical components in percentage by weight: c: 0.6-0.10%, Si: 0.25 to 0.45%, Mn: 0.35-0.50%, P: 0.080-0.120%, S: less than or equal to 0.015 percent, Als: 0.008-0.030%, Ni: 0.12 to 0.20%, Cu: 0.25-0.30%, Cr: 0.30-0.50%, N: less than or equal to 0.0080 percent, and the balance of Fe and inevitable impurities.
2. The cold-rolled weathering steel based on the hood-type annealing process according to claim 1, characterized in that the yield strength of the cold-rolled weathering steel material is higher than 310-350 MPa, the tensile strength is higher than 450-500 MPa, the yield ratio is less than or equal to 0.75, and the quality grade of the plate surface is higher than FB grade.
3. The manufacturing method of cold-rolled weathering steel based on hood annealing process according to any of claims 1-2, characterized by comprising the following steps:
1) pretreating molten iron: pre-slagging and post-slagging are required; the target sulfur content after molten iron desulphurization is less than 0.015 percent;
2) smelting in a converter: enhancing slag stopping operation; deoxidation alloying is needed during tapping;
3) alloy fine adjustment station: reducing the top slag of the steel ladle;
4) and (4) LF furnace: weakly stirring before and after Ca feeding, wherein the stirring time is not less than 11 min;
5) continuous casting: the target temperature of the tundish is controlled to be 20-40 ℃ above the liquidus temperature, and the casting blank needs to be checked in time and cleaned if necessary;
6) hot rolling: firstly, rough rolling is carried out by two-roller reversible rough rolling and four-roller reversible rough rolling to reach the target thickness, then the rough rolling is carried out by 7-frame hot continuous rolling, a finishing mill is provided with a working roller shifting system and a working roller bending system, the convexity and wedge shape of the plate shape are controlled, and the convexity is required: c40 is more than or equal to 20 mu m and less than or equal to 60 mu m, and the wedge requirement is as follows: the | W40| is less than or equal to 40 μm;
7) cold rolling;
8) cover type annealing process: acid rolling incoming material → electrolytic degreasing → cover annealing → wet flattening → coiling packaging.
4. The manufacturing method of cold-rolled weathering steel based on hood-type annealing process according to claim 3, characterized in that in the step 6, the tapping temperature is: 1230-1270 ℃; the finishing temperature is as follows: 880 to 910 ℃; coiling temperature: 600-640 ℃.
5. The manufacturing method of cold-rolled weathering steel based on hood-type annealing process according to claim 3, characterized in that in step 7, the total rolling reduction of five-stand cold continuous rolling is 40% -60%.
6. The manufacturing method of cold-rolled weathering steel based on hood annealing process as claimed in claim 3, characterized in that in step 8, the cold spot temperature in the hood annealing temperature is: 670 to 690 ℃; the sealing gas is annealed with perhydrogen.
7. The manufacturing method of cold-rolled weathering steel based on hood-type annealing process as claimed in claim 3, characterized in that in the step 8, the wet flat elongation is selected according to the following criteria:
the thickness of the steel plate is less than 0.8mm, and the leveling elongation is 0.6-0.9%;
the thickness of the steel plate is more than or equal to 0.8-less than 1.0mm, and the flat elongation is 0.7-1.0%
The thickness of the steel plate is more than or equal to 1.0-less than 1.2mm, and the leveling elongation is 0.9-1.2%;
the thickness of the steel plate is more than or equal to 1.2-less than 1.6mm, and the leveling elongation is 1.0-1.3%;
the thickness of the steel plate is more than or equal to 1.6mm, and the leveling elongation is 1.1-1.4%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911103678.1A CN110699602A (en) | 2019-11-13 | 2019-11-13 | Cold-rolled weathering steel based on cover-type annealing process and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911103678.1A CN110699602A (en) | 2019-11-13 | 2019-11-13 | Cold-rolled weathering steel based on cover-type annealing process and manufacturing method thereof |
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| CN110699602A true CN110699602A (en) | 2020-01-17 |
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| CN201911103678.1A Pending CN110699602A (en) | 2019-11-13 | 2019-11-13 | Cold-rolled weathering steel based on cover-type annealing process and manufacturing method thereof |
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| CN113637902A (en) * | 2021-07-28 | 2021-11-12 | 武汉钢铁有限公司 | Cold-rolled automobile weathering steel containing rare earth and having yield strength of 280MPa and production method thereof |
| CN113637903A (en) * | 2021-07-28 | 2021-11-12 | 武汉钢铁有限公司 | Cold-rolled automobile weathering steel containing rare earth and having yield strength of 310MPa and production method thereof |
| CN117181810A (en) * | 2023-09-26 | 2023-12-08 | 江苏甬金金属科技有限公司 | A method for preparing ultra-thin cold-rolled weather-resistant steel strip |
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| CN111349771A (en) * | 2020-04-22 | 2020-06-30 | 马鞍山钢铁股份有限公司 | 980 MPa-grade cold-rolled Q & P steel with excellent plasticity and manufacturing method thereof |
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| CN113637902A (en) * | 2021-07-28 | 2021-11-12 | 武汉钢铁有限公司 | Cold-rolled automobile weathering steel containing rare earth and having yield strength of 280MPa and production method thereof |
| CN113637903A (en) * | 2021-07-28 | 2021-11-12 | 武汉钢铁有限公司 | Cold-rolled automobile weathering steel containing rare earth and having yield strength of 310MPa and production method thereof |
| CN117181810A (en) * | 2023-09-26 | 2023-12-08 | 江苏甬金金属科技有限公司 | A method for preparing ultra-thin cold-rolled weather-resistant steel strip |
| CN117181810B (en) * | 2023-09-26 | 2024-04-19 | 江苏甬金金属科技有限公司 | Preparation method of ultrathin cold-rolled weather-resistant steel strip |
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