CN110592471A - 1200 MPa-grade cold-rolled martensite steel plate and preparation method thereof - Google Patents
1200 MPa-grade cold-rolled martensite steel plate and preparation method thereof Download PDFInfo
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- CN110592471A CN110592471A CN201910790089.9A CN201910790089A CN110592471A CN 110592471 A CN110592471 A CN 110592471A CN 201910790089 A CN201910790089 A CN 201910790089A CN 110592471 A CN110592471 A CN 110592471A
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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
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- 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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
-
- 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
Abstract
The invention relates to a 1200 MPa-grade cold-rolled martensite steel plate which comprises the following chemical components in percentage by weight: c0.12-0.17; 0.2-0.6% of Si; 2.0-2.5 Mn; 0.01 to 0.04% of Ti; 0.2-0.5% of Cr; p is less than or equal to 0.015; s is less than or equal to 0.008; als 0.03-0.06; n is less than or equal to 0.005, and the balance of Fe and inevitable impurities. The invention also provides a preparation method of the 1200 MPa-grade cold-rolled martensite steel plate, wherein the finish rolling temperature of the hot rolling procedure is controlled to be 890-930 ℃, and the steel plate is cooled to 620-690 ℃ through a laminar cooling system after being rolled and coiled; the rolling reduction rate of the cold rolling process is controlled to be 48-60%; the annealing mode adopts continuous annealing. The martensite steel with stable and uniform structure performance and excellent processing and forming performance can be obtained, and can be widely applied to automobile safety structural members such as automobile anti-collision beams, anti-collision rods, threshold members and the like; the invention has simple production flow and strong universality, is suitable for most of steel enterprises and has wide popularization prospect.
Description
Technical Field
The invention relates to a 1200 MPa-grade cold-rolled martensite steel plate and a preparation method thereof, belonging to the technical field of automobile plate rolling.
Background
With the rapid development of the automobile industry, the use of cold-rolled ultra-high strength steel to achieve light weight of automobiles has become an important direction for the development of automobiles. Currently, cold-rolled ultrahigh-strength steel with the strength level of 1200MPa or below is widely applied and popularized in the automobile industry, wherein ferrite + martensite dual-phase steel is used for relatively more research, and 1200MPa cold-rolled martensite steel is used for relatively less research. According to the requirements of the production process of the dual-phase steel with the same strength level, hardenability alloy elements such as Cr or Mo and the like with higher content and precipitation strengthening elements such as Nb, V or Ti and the like are often added in the chemical composition design, so that the production process, particularly the control difficulty of the acid rolling and annealing processes is relatively high, and the stability of the coil passing performance of the finished steel plate and the plate shape are relatively poor. The microstructure of the cold-rolled martensite steel plate is almost all martensite, has higher strength and stable and uniform structure performance, still has better processing and forming performance, and is mainly used for manufacturing safety structural members such as automobile threshold members, bumpers, crash bars and the like. At present, the highest-strength-level cold-rolled ultrahigh-strength steel with higher universality in the automobile industry is 1200MPa level, so that the research and development of the 1200 MPa-level cold-rolled martensitic steel are particularly important for better meeting the requirement of the automobile industry on light weight.
Chinese patent CN108977726A discloses an anti-delayed cracking martensite ultrahigh strength cold-rolled steel strip and a manufacturing method thereof, in the technical scheme of the document, a water cooling process is adopted in an annealing fast cooling section, the required speed is not less than 500 ℃/s, but the water cooling process is not beneficial to the surface quality and the shape of the steel strip, and pickling and induction heating are needed after water cooling, so that the production cost is high; meanwhile, the preparation method is low in universality, and only a few manufacturers of annealing equipment at home and abroad have water cooling capacity at present.
Disclosure of Invention
The invention aims to solve the technical problem of providing a 1200 MPa-grade cold-rolled martensitic steel plate and a preparation method thereof, wherein martensitic steel with stable and uniform structure performance and excellent processing and forming performance is obtained by designing Ti microalloying components, matching with a reasonable rolling and annealing process and fully utilizing a phase change strengthening mechanism and a precipitation strengthening mechanism.
The technical scheme of the invention is as follows:
the 1200 MPa-grade cold-rolled martensite steel plate comprises the following chemical components in percentage by weight: c0.12-0.17; 0.2-0.6% of Si; 2.0-2.5 Mn; 0.01 to 0.04% of Ti; 0.2-0.5% of Cr; p is less than or equal to 0.015; s is less than or equal to 0.008; als 0.03-0.06; n is less than or equal to 0.005, and the balance of Fe and inevitable impurities.
The 1200 MPa-grade cold-rolled martensite steel plate preferably comprises the following chemical components in percentage by weight: c0.13-0.17; 0.3-0.6% of Si; 2.0-2.5 Mn; 0.02 to 0.04 percent of Ti; 0.2-0.5% of Cr; p is less than or equal to 0.012; s is less than or equal to 0.006; als 0.03-0.06; n is less than or equal to 0.005, and the balance of Fe and inevitable impurities.
The preparation method of the 1200 MPa-level cold-rolled martensite steel plate comprises the working procedures of converter smelting, LF + RH duplex refining, hot rolling, cold rolling and annealing, wherein continuous casting is carried out after the duplex refining, and the chemical components and the weight percentage content of a plate blank prepared by continuous casting are respectively as follows: c0.12-0.17, preferably C0.13-0.17; 0.2 to 0.6, preferably 0.3 to 0.6, of Si; 2.0-2.5 Mn; 0.01 to 0.04wt% of Ti0.02 to 0.04wt%, preferably 0.02 to 0.04 wt%; 0.2-0.5% of Cr; p is less than or equal to 0.015, preferably P is less than or equal to 0.012; s is less than or equal to 0.008, preferably S is less than or equal to 0.006; als 0.03-0.06; n is less than or equal to 0.005, and the balance of Fe and inevitable impurities.
The preparation method of the 1200 MPa-grade cold-rolled martensite steel plate comprises the hot rolling process: and controlling the finishing temperature to be 890-930 ℃, and cooling to 620-690 ℃ through a laminar cooling system after rolling.
The rolling reduction rate of the cold rolling procedure is controlled to be 48-60%; the annealing mode adopts continuous annealing.
The preparation method of the 1200 MPa-grade cold-rolled martensite steel plate comprises the following steps of carrying out air cooling on a quick cooling mode of an annealing process, keeping the high hydrogen content of a quick cooling section at 12 ~ 30wt%, heating the steel plate to 850-900 ℃ at a heating rate of 1-3 ℃/s, carrying out heat preservation for 90-140 s, basically realizing complete austenitization of the steel plate, carrying out slow cooling to 780-830 ℃ at a cooling rate of 0.9-2 ℃/s, carrying out fast cooling to 280-340 ℃ at a cooling rate of 40-50 ℃/s, enabling the steel plate to generate martensite phase transformation, fully inhibiting pearlite or bainite phase transformation, carrying out overaging treatment for 250-400 s, and enabling the flattening elongation to be 0.2-0.5%, and obtaining good plate shape through flattening.
The content of each element disclosed by the invention is the optimal content obtained by a large amount of experimental data and field production, and the effect of each element is as follows:
c: carbon is an effective strengthening element and can greatly improve the strength of the steel; however, too high carbon content deteriorates the weldability of steel, and the solid solution strengthening leads to an increase in strength and a decrease in plasticity; according to the invention, the C content is selected to be 0.12-0.17 wt%, and the steel plate strength cannot be ensured if the C content is too low.
Si: silicon is a ferrite forming element and exists in the steel mainly in a solid solution mode to play a strengthening role; si is a non-carbide forming element, can expand an alpha + gamma region in an Fe-C phase diagram, improve the transformation temperature from austenite to ferrite and promote the precipitation of the ferrite; the Si content is selected to be 0.2-0.6 wt%.
Mn: manganese is an austenite stabilizing element, has an obvious inhibiting effect on the recrystallization process of austenite, and can play a role in solid solution strengthening and grain refinement. The Mn content is selected to be 2.0-2.5 wt%.
Ti: the addition of Ti in a sufficient amount has obvious effect on controlling the shape of the sulfide; even with the addition of small amounts of Ti (< 0.02 wt%), grain growth is significantly inhibited at high temperatures. The Ti content is selected to be 0.01-0.04 wt%.
Cr: chromium is a medium-strength carbide forming element, can remarkably improve the hardenability of steel and strongly postpones pearlite transformation and bainite transformation; chromium may also promote the diffusion of carbon into austenite and may reduce the yield strength of ferrite. The Cr content is selected to be 0.2-0.5 wt%.
P: the impurity elements in the steel are required to be less than or equal to 0.015 wt%.
S: the content of impurity elements in the steel is required to be less than or equal to 0.008 wt%.
And Als: the alloy plays roles in deoxidizing and refining grains in steel, and the content of Als is required to be 0.03-0.06 wt%.
N: the impurity elements in the steel are required to be less than or equal to 0.005 wt%.
The hot rolling process of the invention: controlling the final rolling temperature to be 890-930 ℃, and cooling to 620-690 ℃ through a laminar cooling system after rolling; at the higher finishing rolling temperature and coiling temperature, the deformation energy storage of austenite during rolling is relatively less, so that the hot-rolled structure grains are relatively coarse, the strength of the hot-rolled steel plate is reduced, and the subsequent acid rolling stability is facilitated.
In the annealing process, firstly, a steel plate is heated to 850-900 ℃ at a heating rate of 1-3 ℃/s, heat preservation is carried out for 90-140 s, the steel plate basically realizes complete austenitization, carbon elements in steel are diffused more uniformly, the stability of the strip steel coiling performance is improved, then, the steel plate is slowly cooled to 780-830 ℃ at a cooling rate of 0.9-2 ℃/s, then, the steel plate is rapidly cooled to 280-340 ℃ at a cooling rate of 40-50 ℃/s, martensite phase transformation of the steel plate is caused, pearlite or bainite phase transformation is fully inhibited, overaging treatment is carried out for 250-400 s, the flattening elongation is 0.2-0.5%, and the steel plate obtains a good plate shape through flattening.
The invention has the beneficial effects that:
according to the invention, through the component design of Cr and Ti microalloying and the matching of reasonable rolling and annealing processes, the effects of phase transformation strengthening and precipitation strengthening of the steel plate are enhanced, the martensitic steel with stable and uniform structure performance and excellent processing and forming performance is obtained, the tensile strength reaches over 1200MPa, the structure is a uniform lath martensitic structure, and the martensitic steel can be widely applied to automobile safety structural members such as automobile anti-collision beams, anti-collision rods, threshold members and the like; the invention has simple production flow and strong universality, is suitable for most of steel enterprises and has wide popularization prospect.
Drawings
FIG. 1 is a metallographic structure diagram (1000X) of a 1200 MPa-grade cold-rolled martensitic steel sheet produced in example 1;
FIG. 2 is a metallographic structure drawing (1000X) of a 1200 MPa-grade cold-rolled martensitic steel sheet produced in example 2;
FIG. 3 is a metallographic structure drawing (1000X) of a 1200 MPa-grade cold-rolled martensitic steel sheet produced in example 3;
FIG. 4 is a metallographic structure drawing (1000X) of a 1200 MPa-grade cold-rolled martensitic steel sheet produced in example 4;
FIG. 5 is a metallographic structure drawing (1000X) of a 1200 MPa-grade cold-rolled martensitic steel sheet produced in example 5;
FIG. 6 is a metallographic structure drawing (1000X) of a 1200 MPa-grade cold-rolled martensitic steel sheet produced in example 6;
FIG. 7 is a metallographic structure drawing (1000X) of a 1200 MPa-grade cold-rolled martensitic steel sheet produced in example 7;
FIG. 8 is a metallographic structure drawing (1000X) of a 1200 MPa-grade cold-rolled martensitic steel sheet produced in example 8;
FIG. 9 is a metallographic structure drawing (1000X) of a 1200 MPa-grade cold-rolled martensitic steel sheet produced in example 9;
FIG. 10 is a metallographic structure drawing (1000X) of a 1200 MPa-grade cold-rolled martensitic steel sheet produced in example 10.
Detailed Description
The invention relates to a 1200 MPa-grade cold-rolled martensite steel plate, which comprises the following chemical components in percentage by weight: c0.12-0.17, preferably C0.13-0.17; 0.2 to 0.6, preferably 0.3 to 0.6, of Si; 2.0-2.5 Mn; 0.01 to 0.04, preferably 0.02 to 0.04, of Ti; 0.2-0.5% of Cr; p is less than or equal to 0.015, preferably P is less than or equal to 0.012; s is less than or equal to 0.008, preferably S is less than or equal to 0.006; als0.03-0.06; n is less than or equal to 0.005, and the balance of Fe and inevitable impurities;
the invention discloses a preparation method of a 1200 MPa-grade cold-rolled martensite steel plate, which comprises the following steps:
(1) smelting: smelting in a converter, carrying out LF + RH duplex, and continuously casting to obtain a plate blank;
(2) hot rolling: controlling the final rolling temperature to be 890-930 ℃, and cooling to 620-690 ℃ through a laminar cooling system after rolling;
(3) cold rolling: the reduction rate is controlled to be 48-60%;
(4) annealing: the annealing mode adopts continuous annealing;
the annealing process comprises the specific steps of heating a steel plate to 850-900 ℃ at a heating rate of 1-3 ℃/s, preserving heat for 90-140 s, then slowly cooling to 780-830 ℃ at a cooling rate of 0.9-2 ℃/s, then rapidly cooling to 280-340 ℃ at a cooling rate of 40-50 ℃/s, and carrying out overaging treatment for 250-400 s, wherein the flat elongation is 0.2-0.5%.
According to the invention, through Cr and Ti microalloying component design, matching with reasonable rolling and annealing process design, the phase transformation strengthening and precipitation strengthening effects of the strengthened steel plate are achieved, and the martensitic steel with stable and uniform structure performance and excellent processing and forming performance is obtained, and the tensile strength reaches over 1200 MPa.
The present invention will be described in detail below with reference to specific examples 1 to 10:
in the embodiment 1-10, a 260-ton converter is adopted for smelting, the main tasks of the converter process are decarburization, dephosphorization and temperature control, LF and RH duplex refining are mainly for desulfurization, degassing, alloy fine adjustment, inclusion removal and the like, protective casting is adopted for continuous casting, nitrogen addition and secondary oxidation are prevented, constant-pulling-speed casting is adopted, the process is controlled stably, the fluctuation of the liquid level is controlled within +/-3 mm, a 2250-mm hot rolling unit is adopted for hot rolling, the heating temperature is 1220-1280 ℃, the finish rolling temperature is 890-930 ℃, the steel plate is cooled to 620-690 ℃ through a laminar cooling system after rolling, the cold rolling reduction rate is controlled to 48-60%, continuous annealing is adopted for an annealing process, the rapid cooling mode is air cooling, the high hydrogen content of the rapid cooling section is 12-12 ~ 30wt%, the steel plate is heated to 850-900 ℃ at the heating rate of 1-3 ℃/s, the heat is preserved for 90-140 s, then the steel plate is slowly cooled to 780-830 ℃ at the cooling rate of 0.9-2 ℃/s, the annealing process is performed to 280-340 ℃ for rapid cooling, and the aging and the flattening is performed for 250-400 s, and.
Table 1 shows the chemical compositions (wt%) of the cold-rolled martensite steel sheets of 1200MPa grade prepared in examples 1-10:
TABLE 1 chemical composition
Table 2 lists the hot rolling process parameters used for preparing 1200MPa cold-rolled martensite steel plates in examples 1-10:
TABLE 2 Hot Rolling Process parameters
Table 3 lists the parameters of the cold rolling and annealing process used for preparing the 1200MPa cold-rolled martensite steel plate in the examples 1-10:
TABLE 3 Cold Rolling and annealing Process parameters
Table 4 shows the mechanical properties of finished products of the 1200MPa cold-rolled martensite steel plates prepared in the examples 1-10:
TABLE 4 Cold Rolling and annealing Process parameters
As can be seen from Table 4, the 1200 MPa-grade cold-rolled martensite steel plate produced by the invention has the tensile strength of more than 1200MPa and excellent mechanical properties.
As can be seen from FIGS. 1 to 10, the metallographic structure of the 1200 MPa-grade cold-rolled martensitic steel sheet produced by the present invention is a uniform lath martensite structure.
Claims (5)
1.1200MPa level cold-rolled martensite steel plate, characterized by: the steel plate comprises the following chemical components in percentage by weight: c0.12-0.17; 0.2-0.6% of Si; 2.0-2.5 Mn; 0.01 to 0.04% of Ti; 0.2-0.5% of Cr; p is less than or equal to 0.015; s is less than or equal to 0.008; als 0.03-0.06; n is less than or equal to 0.005, and the balance of Fe and inevitable impurities.
2. The cold-rolled martensitic steel sheet as claimed in claim 1, wherein: the steel plate preferably comprises the following chemical components in percentage by weight: c0.13-0.17; 0.3-0.6% of Si; 2.0-2.5 Mn; 0.02 to 0.04 percent of Ti; 0.2-0.5% of Cr; p is less than or equal to 0.012; s is less than or equal to 0.006; als 0.03-0.06; n is less than or equal to 0.005, and the balance of Fe and inevitable impurities.
The preparation method of the 3.1200 MPa-level cold-rolled martensite steel plate comprises the working procedures of converter smelting, LF + RH duplex refining, hot rolling, cold rolling and annealing, and continuous casting is carried out after the duplex refining, and the preparation method is characterized in that: the chemical components and the weight percentage of the plate blank prepared by continuous casting are respectively as follows: c0.12-0.17, preferably C0.13-0.17; 0.2 to 0.6, preferably 0.3 to 0.6, of Si; 2.0-2.5 Mn; 0.01 to 0.04wt% of Ti0.02 to 0.04wt%, preferably 0.02 to 0.04 wt%; 0.2-0.5% of Cr; p is less than or equal to 0.015, preferably P is less than or equal to 0.012; s is less than or equal to 0.008, preferably S is less than or equal to 0.006; als 0.03-0.06; n is less than or equal to 0.005, and the balance of Fe and inevitable impurities.
4. The method of manufacturing a 1200MPa grade cold rolled martensitic steel sheet as claimed in claim 3 wherein: in the hot rolling procedure, the final rolling temperature is controlled to be 890-930 ℃, and the rolled steel is cooled to 620-690 ℃ through a laminar cooling system and coiled; the rolling reduction rate of the cold rolling procedure is controlled to be 48-60%; the annealing mode adopts continuous annealing.
5. The preparation method of the 1200 MPa-grade cold-rolled martensite steel plate according to claim 3 or 4, wherein the annealing process is carried out in a quick cooling mode in an air cooling mode, the high hydrogen content of the quick cooling section is 12 ~ 30wt%, and the annealing process specifically comprises the steps of heating the steel plate to 850-900 ℃ at a heating rate of 1-3 ℃/s, preserving the temperature for 90-140 s, slowly cooling to 780-830 ℃ at a cooling rate of 0.9-2 ℃/s, then rapidly cooling to 280-340 ℃ at a cooling rate of 40-50 ℃/s, carrying out overaging treatment for 250-400 s, and the flat elongation is 0.2-0.5%.
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Cited By (4)
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| CN111519109A (en) * | 2020-06-09 | 2020-08-11 | 首钢集团有限公司 | Ultrahigh-strength martensitic steel and preparation method and application thereof |
| CN111979489A (en) * | 2020-09-07 | 2020-11-24 | 鞍钢股份有限公司 | 780 MPa-grade high-plasticity cold-rolled DH steel and preparation method thereof |
| CN112981252A (en) * | 2021-02-06 | 2021-06-18 | 邯郸钢铁集团有限责任公司 | 1500 MPa-grade steel plate for automobile and production method thereof |
| CN113528932A (en) * | 2021-05-31 | 2021-10-22 | 唐山钢铁集团高强汽车板有限公司 | Martensite steel plate and preparation method thereof |
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