CN112226691B - Hot rolled steel plate for 1800 MPa-grade hot stamping wheel spoke and manufacturing method thereof - Google Patents
Hot rolled steel plate for 1800 MPa-grade hot stamping wheel spoke and manufacturing method thereof Download PDFInfo
- Publication number
- CN112226691B CN112226691B CN202011059391.6A CN202011059391A CN112226691B CN 112226691 B CN112226691 B CN 112226691B CN 202011059391 A CN202011059391 A CN 202011059391A CN 112226691 B CN112226691 B CN 112226691B
- Authority
- CN
- China
- Prior art keywords
- steel plate
- equal
- less
- grade
- hot stamping
- 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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 97
- 239000010959 steel Substances 0.000 title claims abstract description 97
- 238000004519 manufacturing process Methods 0.000 title claims description 20
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 9
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 8
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 6
- 229910052796 boron Inorganic materials 0.000 claims abstract description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 4
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 9
- 238000005266 casting Methods 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 claims description 8
- 238000005516 engineering process Methods 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 6
- 239000011575 calcium Substances 0.000 claims description 5
- 229910000734 martensite Inorganic materials 0.000 claims description 5
- 238000001953 recrystallisation Methods 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 238000009749 continuous casting Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000007670 refining Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 2
- 238000010583 slow cooling Methods 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims 1
- 238000002360 preparation method Methods 0.000 abstract 2
- 238000005728 strengthening Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 239000010955 niobium Substances 0.000 description 8
- 238000001556 precipitation Methods 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910001566 austenite Inorganic materials 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 239000011572 manganese Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 4
- 239000006104 solid solution Substances 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 150000002910 rare earth metals Chemical class 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 3
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012761 high-performance material Substances 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
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
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- 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
- 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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C2007/0093—Duplex process; Two stage processes
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a hot rolled steel plate for a 1800 MPa-level hot stamping wheel spoke and a preparation method thereof, wherein the preparation method comprises the following steps: 0.34% -0.36%, Si: 0.01% -0.10%, Mn: 1.20% -1.55%, P: less than or equal to 0.010 percent, S: less than or equal to 0.004%, Al: 0.015% -0.055%, Nb: 0.03-0.045%, V: 0.031-0.050%, Mo: 0.26-0.35%, B: 0.002-0.004%, rare earth element La + Ce: 0.020% -0.034%, N: less than or equal to 0.003 percent, and the balance of Fe and inevitable impurities.
Description
Technical Field
The invention relates to a steel plate for an automobile, in particular to a hot rolled steel plate for a hot stamping wheel spoke with good surface quality and impact property and a manufacturing method thereof.
Background
In recent years, in order to meet the goals of safety, environmental protection and energy conservation, automobile enterprises have increasingly put forward the requirements of light weight of the whole automobile and safety of collision. In order to meet the development requirements of the automobile industry, steel enterprises continuously develop products such as high-strength steel, advanced high-strength steel, ultrahigh-strength steel, hot forming steel and the like, correspondingly develop advanced steel plate deep processing technologies such as hot forming, hydraulic forming, spinning forming and the like, and ensure that high-performance materials are widely applied to automobile body manufacturing. As an important component of an automobile, the development of light weight of automobile wheels is continuously accelerated, and the production of the wheels by adopting high-strength and ultrahigh-strength steel with excellent performance is an effective way for realizing the aims of light weight and safety. At present, along with the improvement of the production process of automobile wheels, steel is required to have good strength indexes and forming performance indexes, and also required to have good surface quality, dimensional accuracy, impact toughness and the like so as to meet the requirements of use, forming and appearance of the steel. In view of the good characteristics of the hot stamping technology, steel mills and automobile wheel production enterprises at home and abroad introduce the hot stamping technology into the field of automobile wheel manufacturing at present, and the aims of light weight and safety of the wheels can be achieved to a great extent. However, when the conventional hot stamping steel is used for manufacturing the wheel, the problems in the aspects of surface quality, impact performance and the like generally exist, the manufacturing requirements of the automobile wheel are not met, and particularly, the hot stamping steel is not suitable for the process for producing the wheel spoke by performing the pre-forming before the hot stamping.
In view of the above problems, it is imperative to develop hot rolled steel sheets for hot stamped wheel spokes having good surface quality and impact properties.
Disclosure of Invention
Aiming at the defects in the prior art and aiming at the development requirements of light weight and safety of automobiles, the invention provides a hot-rolled steel plate for a hot-stamping wheel spoke with good surface quality and impact property and a manufacturing method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a hot rolled steel plate for a 1800 MPa-grade hot stamping wheel spoke is characterized by comprising the following chemical components in percentage by mass: c: 0.34% -0.36%, Si: 0.01% -0.10%, Mn: 1.20% -1.55%, P: less than or equal to 0.010 percent, S: less than or equal to 0.004%, Al: 0.015% -0.055%, Nb: 0.03-0.045%, V: 0.031-0.050%, Mo: 0.26-0.35%, B: 0.002-0.004%, rare earth element La + Ce: 0.020% -0.034%, N: less than or equal to 0.003 percent, and the balance of Fe and inevitable impurities.
The tensile strength of the hot rolled steel plate is 500-550MPa, the yield strength is 350-400MPa, the elongation is more than or equal to 28%, the band structure is less than or equal to 1.0 grade, and the grade of the non-metallic inclusion is less than or equal to 1.0 grade.
The thickness specification of the steel plate is 6-10mm, and the surface of the steel plate has no defects such as scale stripes, chromatic aberration, cracks and the like;
when the steel plate is used for manufacturing the spoke, after more than 70% of pre-deformation and hot stamping forming, the steel plate structure is a full martensite structure, the tensile strength is more than or equal to 1800MPa, the yield strength is more than or equal to 1400MPa, the elongation is more than or equal to 8%, and the impact energy at the temperature of minus 20 ℃ is more than or equal to 120J.
The manufacturing method of the hot rolled steel plate for the 1800 MPa-grade hot stamping wheel spoke comprises the following steps of:
1. adopting RH + LF process, strictly controlling H, O content, H less than or equal to 0.0002%, O less than or equal to 0.0015%;
2. calcium treatment is carried out in the refining process, and w (Ca)/w (Al) is ensured to be 0.09-0.14;
3. electromagnetic stirring and soft reduction technology are put into the continuous casting process, the casting blank pulling speed is less than or equal to 1.1m/min, and stacking and slow cooling are carried out after the casting blank is off line;
4. heating the casting blank with the thickness of 170 plus 230mm to 1220 +/-20 ℃, and preserving the heat for 1.5-2 hours;
5. two-stage controlled rolling is adopted, the reduction rate of a non-recrystallization area is more than 92 percent, and the finish rolling temperature is 910-; after the final rolling, adopting a front-section rapid cooling mode, wherein the cooling speed is more than 60 ℃/s, cooling the steel plate to 650-680 ℃, then coiling, rapidly placing the coiled steel coil into a heat-preservation cover for heat preservation, and taking out when the temperature is below 300 ℃;
6. the thickness of the finished hot rolled steel plate is 6-10 mm.
The steel plate of the invention mainly comprises the following components:
c: carbon is the guarantee of the strength of the steel plate, the carbon content is too low, the strength of the steel plate after hot stamping cannot reach the expected target, the carbon content is too high, and the strength of the steel plate after hot rolling and coiling is high, so that the steel plate is not beneficial to predeformation. Meanwhile, the improvement of the carbon element is beneficial to improving the hardenability of the steel, and the optimal range of C in the invention is 0.34-0.36%.
Si: silicon is a solid-solution strengthening element, and has an effect of improving the strength of a steel sheet by a solid-solution strengthening effect and also improving the hardenability of the steel sheet. However, too high Si content causes a large amount of scale, color difference, etc. on the surface of the hot rolled steel sheet. The steel plate provided by the invention adopts a low-Si component system, and the Si content is 0.01-0.10%.
Mn: manganese also has the effect of improving the strength of the steel sheet by solid solution strengthening, and can also significantly improve the hardenability of the steel. However, the Mn content is too high, which deteriorates the uniformity of the steel sheet structure during the smelting and hot rolling processes and tends to cause severe band-shaped structure defects in the structure. The Mn content selected by the invention is 1.20-1.55%.
P, S: phosphorus and sulfur are harmful elements, P is easy to cause the casting blank to have segregation defect, S can form MnS inclusion to deteriorate the microstructure, mechanical property and impact property of the steel plate, P is less than or equal to 0.010 percent, and S is less than or equal to 0.004 percent.
Al: the aluminum plays a role in deoxidation and nitrogen determination in the smelting process and can effectively improve the oxidation resistance of the steel plate, but excessive aluminum can cause a large amount of aluminum inclusions. The range of Al in the invention is 0.015% -0.055%.
Mo: molybdenum is a medium-strength carbide forming element and can improve the strength and toughness of the steel plate; mo can obviously improve the stability of austenite, increase the hardenability of steel and facilitate the transformation from austenite to martensite in the hot stamping process. The Mo content of the invention is 0.26-0.35%.
Nb: niobium mainly plays roles of fine grain strengthening, precipitation strengthening and the like in steel. At high temperature, niobium exists in austenite in a solid solution state, can inhibit austenite grain growth and static and dynamic recrystallization in a thermal deformation process, and can improve the recrystallization termination temperature and the finish rolling temperature; meanwhile, the niobium carbonitride precipitation can also delay recrystallization, thereby preventing austenite grains from growing large, having obvious fine grain strengthening and precipitation strengthening effects, effectively reducing the steel plate banded structure grade and improving the impact property. The optimum range of niobium content in the present invention is between 0.03 and 0.045%.
V: the vanadium has remarkable precipitation strengthening and fine-grain strengthening effects, the vanadium effect is mainly realized by forming precipitates with carbon and nitrogen, particularly VN precipitation formed with nitrogen can greatly improve the strength of the steel plate, BN precipitation can be inhibited, and strength reduction caused by B precipitation is avoided. In addition, the addition of V can be combined with H to improve the delayed fracture resistance of the steel plate. The optimal range of vanadium in the invention is 0.031-0.05%.
B: boron is added into the steel, so that the hardenability of the steel can be obviously improved, and the strength stability of the steel plate can be ensured after quenching. When the content of B is too low, the effect is not obvious, and when the content of B is too high, the B and N in the steel can easily form a compound of B, so that the performance of the steel plate is reduced. The content of B in the invention is 0.002-0.004%.
RE: the rare earth has strong deoxidizing and desulfurizing capacities, can change the appearance of sulfide inclusions, can improve the plasticity of the steel plate and reduce the anisotropy; the rare earth can improve the fatigue property of the steel plate, improve the welding property of the steel plate and simultaneously improve the cold forming property of the steel plate. The content of the rare earth (La + Ce) in the invention is 0.020-0.034%.
N: for B-containing steel, the lower the content of N, the better, but the lower the content of N, the production difficulty and the cost increase are caused, so the content of N is less than or equal to 0.003 percent in the invention.
The steel plate is designed by adopting low Si components, Nb, V, Mo, B and rare earth elements are added in a compounding way, the microstructure of the steel plate is effectively refined, the grades of the banded structure and the inclusion of the steel plate can be obviously reduced by matching with a reasonable hot rolling process, the impact property of the hot-stamped steel plate is improved, and the surface quality of the steel plate is good. The low strength of the steel plate is beneficial to the pre-deformation before hot stamping, and the addition of each alloy element ensures that the steel plate has good hardenability, ensures that the steel plate obtains a full martensite structure after hot stamping, and ensures that the strength of the steel plate reaches the expected target.
The hot rolled steel plate for the hot stamping wheel spoke with excellent impact property has the following beneficial effects: the Si content in the components is low, and the surface quality of the steel plate is good; the coiling temperature is relatively high, the coiled steel plate is placed in a heat-insulating cover after being coiled, the strength of the steel plate is lower than 550MPa, and the smooth pre-deformation of the spoke under the normal temperature condition before hot stamping is ensured; by adding rare earth elements into the components, strictly controlling the P, S content, carrying out wire feeding treatment in the smelting process, putting into electromagnetic stirring and light pressing and other measures, the steel plate has a banded structure and inclusion grade below 1.0 grade, and the forming requirement of the steel plate is met; the steel plate structure is refined through the action of alloy elements such as Nb, V, Mo and the like, and the hot stamped steel plate has good structural property uniformity and impact toughness.
Drawings
FIG. 1 is a microstructure of a hot rolled steel sheet according to example 3;
FIG. 2 is a microstructure of a hot stamped steel sheet according to example 3.
Detailed Description
The following description is given with reference to specific examples:
the specific composition, temperature profile, and structure and properties of the steel sheet of 5 examples of the present invention are shown in tables 1 to 3. The mechanical properties of the steel sheet after pre-deformation and hot stamping in the spoke manufacturing process are shown in table 4. The microstructure of the steel sheet of example 3 is shown in fig. 1, and is ferrite and pearlite; the structure of the steel sheet after hot stamping is an all-martensite structure, as shown in fig. 2.
TABLE 1 chemical composition of inventive examples (wt%)
TABLE 2 temperature regime for the examples of the invention
TABLE 3 organization and mechanical Property parameters of embodiments of the invention
TABLE 4 mechanical Properties after Hot stamping of the examples of the invention
As can be seen from tables 1-4 and FIGS. 1-2, the hot rolled steel plate provided by the invention has lower strength and good structural uniformity, the steel plate meets the requirements of pre-deformation and hot stamping forming in the manufacturing process of the automobile spoke, the tensile strength after hot stamping can reach more than 1800MPa, the elongation is higher than 8.0%, the hot rolled steel plate has good impact resistance, and the hot rolled steel plate can be used for manufacturing the automobile spoke and can achieve remarkable light weight effect and safety target.
Claims (2)
1. A hot rolled steel plate for a 1800 MPa-grade hot stamping wheel spoke is characterized by comprising the following chemical components in percentage by mass: c: 0.34% -0.36%, Si: 0.01% -0.10%, Mn: 1.20% -1.55%, P: less than or equal to 0.010 percent, S: less than or equal to 0.004%, Al: 0.015% -0.055%, Nb: 0.03-0.045%, V: 0.031-0.050%, Mo: 0.26-0.35%, B: 0.002-0.004%, rare earth element La + Ce: 0.020% -0.034%, N: less than or equal to 0.003 percent, and the balance of Fe and inevitable impurities;
the manufacturing method of the hot rolled steel plate for the 1800 MPa-grade hot stamping wheel spoke comprises the following steps of: performing calcium treatment in a refining process by adopting an RH + LF process, putting electromagnetic stirring and light reduction technology in a continuous casting process, heating a casting blank with the thickness of 230mm in 170-; after the final rolling, adopting a front-section rapid cooling mode, wherein the cooling speed is more than 60 ℃/s, cooling the steel plate to 650-680 ℃, then coiling, rapidly placing the coiled steel coil into a heat-preservation cover for heat preservation, and taking out when the temperature is below 300 ℃;
the tensile strength of the hot rolled steel plate is 500-550MPa, the yield strength is 350-400MPa, the elongation is more than or equal to 28%, the band structure is less than or equal to 1.0 grade, and the grade of the non-metallic inclusion is less than or equal to 1.0 grade; the thickness specification of the steel plate is 6-10 mm; when the steel plate is used for manufacturing the spoke, after more than 70% of pre-deformation and hot stamping forming, the steel plate has a full martensite structure, the tensile strength is more than or equal to 1800MPa, the yield strength is more than or equal to 1400MPa, the elongation is more than or equal to 8%, and the impact energy at the temperature of minus 20 ℃ is more than or equal to 120J.
2. A manufacturing method of the hot rolled steel plate for the 1800MPa grade hot stamping wheel spoke according to claim 1 is characterized by comprising the following steps:
a. adopting RH + LF process, strictly controlling H, O content, H less than or equal to 0.0002%, O less than or equal to 0.0015%;
b. performing calcium treatment in a refining process to ensure that w (Ca)/w (Al) = 0.09-0.14;
c. electromagnetic stirring and soft reduction technology are put into the continuous casting process, the casting blank pulling speed is less than or equal to 1.1m/min, and stacking and slow cooling are carried out after the casting blank is off line;
d. heating the casting blank with the thickness of 170 plus 230mm to 1220 +/-20 ℃, and preserving the heat for 1.5-2 hours;
e. two-stage controlled rolling is adopted, the reduction rate of a non-recrystallization area is more than 92 percent, and the finish rolling temperature is 910-; and (3) after the final rolling, adopting a front-section rapid cooling mode, cooling the steel plate to 650-680 ℃ at a cooling speed of more than 60 ℃/s, then coiling, rapidly placing the coiled steel coil into a heat-insulating cover for heat insulation, and taking out the steel coil when the temperature is below 300 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011059391.6A CN112226691B (en) | 2020-09-30 | 2020-09-30 | Hot rolled steel plate for 1800 MPa-grade hot stamping wheel spoke and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011059391.6A CN112226691B (en) | 2020-09-30 | 2020-09-30 | Hot rolled steel plate for 1800 MPa-grade hot stamping wheel spoke and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112226691A CN112226691A (en) | 2021-01-15 |
| CN112226691B true CN112226691B (en) | 2022-02-15 |
Family
ID=74120471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011059391.6A Active CN112226691B (en) | 2020-09-30 | 2020-09-30 | Hot rolled steel plate for 1800 MPa-grade hot stamping wheel spoke and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112226691B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114107636B (en) * | 2021-10-19 | 2023-02-24 | 北京科技大学 | 2000 MPa-grade hot-rolled hot-forming steel for ultrahigh-strength and high-toughness spoke and preparation method thereof |
| CN118434887A (en) * | 2021-12-29 | 2024-08-02 | 普利司通美国轮胎运营有限责任公司 | Non-pneumatic tire with curved spokes and method of making the same |
| CN114836696B (en) * | 2022-04-27 | 2023-06-20 | 鞍钢股份有限公司 | 390 MPa-level steel for automobile axle housing for hot stamping and production method thereof |
| EP4324950A1 (en) * | 2022-08-18 | 2024-02-21 | ThyssenKrupp Steel Europe AG | Steel with improved processing properties for forming at elevated temperatures |
| CN116875891A (en) * | 2023-06-29 | 2023-10-13 | 鞍钢股份有限公司 | 1000 MPa-level hot rolled steel plate for automobile upper assembly and production method thereof |
| CN116875895B (en) * | 2023-06-29 | 2024-08-16 | 鞍钢股份有限公司 | Hot rolled steel plate for automobile upper mounting of 1350MPa level without heat treatment and production method |
| CN116875896B (en) * | 2023-06-29 | 2024-07-23 | 鞍钢股份有限公司 | Hot rolled steel plate for 1700 MPa-grade high-strength automobile upper mounting and production method thereof |
| CN116875892A (en) * | 2023-06-29 | 2023-10-13 | 鞍钢股份有限公司 | 1300 MPa-grade hot rolled steel plate for automobile upper assembly and production method thereof |
| CN116875890A (en) * | 2023-06-29 | 2023-10-13 | 鞍钢股份有限公司 | Hot rolled steel plate for 850 MPa-level automobile upper assembly and production method thereof |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102770571A (en) * | 2010-01-29 | 2012-11-07 | 新日本制铁株式会社 | Steel sheet and process for producing steel sheet |
| CN102939399A (en) * | 2010-06-14 | 2013-02-20 | 新日铁住金株式会社 | Hot-stamp-molded article, process for production of steel sheet for hot stamping, and process for production of hot-stamp-molded article |
| CN103443317A (en) * | 2011-03-18 | 2013-12-11 | 新日铁住金株式会社 | Steel sheet for hot-tamped member and process for producing same |
| CN107614722A (en) * | 2015-05-07 | 2018-01-19 | 新日铁住金株式会社 | High-strength steel sheet and its manufacture method |
| CN107815597A (en) * | 2017-11-17 | 2018-03-20 | 武汉钢铁有限公司 | A kind of high-intensity rim steel and production method with good flanging forming |
| CN107858598A (en) * | 2017-11-17 | 2018-03-30 | 武汉钢铁有限公司 | A kind of tensile strength is 490MPa level wheel rim steel and production method |
| CN108884531A (en) * | 2016-04-19 | 2018-11-23 | 杰富意钢铁株式会社 | The manufacturing method of wear-resistant steel plate and wear-resistant steel plate |
| CN109797336A (en) * | 2019-01-17 | 2019-05-24 | 武汉钢铁有限公司 | The tubeless rim steel and production method of a kind of thickness in 9 ~ 11mm |
| CN110366603A (en) * | 2017-03-13 | 2019-10-22 | 杰富意钢铁株式会社 | The manufacturing method of wear-resistant steel plate and wear-resistant steel plate |
-
2020
- 2020-09-30 CN CN202011059391.6A patent/CN112226691B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102770571A (en) * | 2010-01-29 | 2012-11-07 | 新日本制铁株式会社 | Steel sheet and process for producing steel sheet |
| CN102939399A (en) * | 2010-06-14 | 2013-02-20 | 新日铁住金株式会社 | Hot-stamp-molded article, process for production of steel sheet for hot stamping, and process for production of hot-stamp-molded article |
| CN103443317A (en) * | 2011-03-18 | 2013-12-11 | 新日铁住金株式会社 | Steel sheet for hot-tamped member and process for producing same |
| CN107614722A (en) * | 2015-05-07 | 2018-01-19 | 新日铁住金株式会社 | High-strength steel sheet and its manufacture method |
| CN108884531A (en) * | 2016-04-19 | 2018-11-23 | 杰富意钢铁株式会社 | The manufacturing method of wear-resistant steel plate and wear-resistant steel plate |
| CN110366603A (en) * | 2017-03-13 | 2019-10-22 | 杰富意钢铁株式会社 | The manufacturing method of wear-resistant steel plate and wear-resistant steel plate |
| CN107815597A (en) * | 2017-11-17 | 2018-03-20 | 武汉钢铁有限公司 | A kind of high-intensity rim steel and production method with good flanging forming |
| CN107858598A (en) * | 2017-11-17 | 2018-03-30 | 武汉钢铁有限公司 | A kind of tensile strength is 490MPa level wheel rim steel and production method |
| CN109797336A (en) * | 2019-01-17 | 2019-05-24 | 武汉钢铁有限公司 | The tubeless rim steel and production method of a kind of thickness in 9 ~ 11mm |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112226691A (en) | 2021-01-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112226691B (en) | Hot rolled steel plate for 1800 MPa-grade hot stamping wheel spoke and manufacturing method thereof | |
| CN112251669B (en) | Hot rolled steel plate for 2000 MPa-level hot stamping wheel spoke and manufacturing method thereof | |
| CN111254354B (en) | V microalloyed high-strength high-toughness bainite non-quenched and tempered steel and forging and cooling control process and production process thereof | |
| CN112267067B (en) | Hot rolled steel plate for 2000 MPa-level hot stamping wheel rim and manufacturing method thereof | |
| CN106011643B (en) | A kind of tensile strength 590MPa grades of cold-rolled biphase steels and preparation method thereof | |
| CN111979489B (en) | 780 MPa-grade high-plasticity cold-rolled DH steel and preparation method thereof | |
| CN106011644B (en) | High elongation rate cold rolling high strength steel plate and preparation method thereof | |
| CN110079740B (en) | High-toughness hot-rolled 530 MPa-grade automobile cold-stamped axle housing steel plate and manufacturing method thereof | |
| CN112095046B (en) | Ultrahigh-strength cold-rolled DH1180 steel and preparation method thereof | |
| CN111118403B (en) | Ti microalloyed high-strength high-toughness bainite non-quenched and tempered steel and forging and cooling control process and production process thereof | |
| CN111172466B (en) | Plasticity-enhanced cold-rolled dual-phase steel with tensile strength of 590MPa and production method thereof | |
| CN109943765B (en) | 800 MPa-grade cold-rolled dual-phase steel with high yield ratio and preparation method thereof | |
| CN110669913B (en) | Hot-rolled and acid-washed dual-phase steel for high-strength automobile wheels and production method thereof | |
| CN109023055B (en) | High-strength high-formability automobile steel plate and production process thereof | |
| CN109136759B (en) | 1300 MPa-grade thick-specification hot forming steel for spoke and preparation method thereof | |
| CN112267066B (en) | Hot rolled steel plate for 1800 MPa-grade hot stamping wheel rim and manufacturing method thereof | |
| CN112226690B (en) | Pickled steel plate for 1800 MPa-level hot stamping wheel rim and manufacturing method thereof | |
| CN112267065B (en) | Pickled steel plate for 2000 MPa-level hot stamping wheel rim and manufacturing method thereof | |
| CN111979488A (en) | 780 MPa-grade alloying hot-dip galvanized DH steel and preparation method thereof | |
| CN116848282A (en) | Steel material for thermoforming, thermoformed part, and method for producing same | |
| CN113846269B (en) | Cold-rolled high-weather-resistance steel plate with high strength and plasticity and preparation method thereof | |
| CN109097681B (en) | High-strength low-inclusion automobile steel plate and electromagnetic stirring process thereof in continuous casting process | |
| CN113957359A (en) | High-strength steel for automobile wheels and preparation method thereof | |
| CN109023092B (en) | 1300 MPa-grade hot forming steel for wheel rim and preparation method thereof | |
| CN115491593B (en) | Hot rolled thin strip steel with tensile strength more than or equal to 1800MPa and produced by adopting TSR production line and 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 |