CN112442635B - High-performance low-alloy high-strength steel plate with strength of above 800MPa and preparation method thereof - Google Patents
High-performance low-alloy high-strength steel plate with strength of above 800MPa and preparation method thereofDownload PDFInfo
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- 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
- 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
- C21D8/0247—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
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- 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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
- 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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
- 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
- C21D2211/005—Ferrite
- 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
- C21D2211/009—Pearlite
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Abstract
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a low-alloy high-strength steel plate with high performance of more than 800MPa and a preparation method thereof.
Background
With the rapid development of the automobile industry, people have higher and higher requirements on safety, energy conservation and emission of automobiles, and the application proportion of high-strength steel in the field of automobile parts is higher and higher.
Generally, the high-grade low-alloy high-strength steel gradually deteriorates in processing and forming performance along with further improvement of strength, and particularly, the high-grade low-alloy high-strength steel cracks in processing modes such as high drawing, flanging and beating, so that the use of the high-grade low-alloy high-strength steel is limited.
Under normal conditions, the low-alloy high-strength steel realizes the control of grain structures by adding some strengthening elements and by matching with a certain process system through a fine-grain and solid-solution strengthening principle, thereby realizing the requirement on strength. The low-alloy high-strength steel with the grade of more than 800MPa has serious microstructure segregation, grain size segregation or obvious fiber shape due to large amount of added alloy and low annealing temperature, thereby seriously influencing subsequent processing performance and greatly limiting the application range of high-grade low-alloy high-strength steel.
Disclosure of Invention
The invention aims to provide a low-alloy high-strength steel plate with high performance of more than 800MPa and a preparation method thereof. The invention realizes the production of the low-alloy high-strength steel plate with high performance of more than 800MPa grade, which is suitable for the complex deformation high-strength parts of automobiles.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a low-alloy high-strength steel plate with high performance of more than 800MPa comprises the following chemical components in percentage by mass: c: 0.15-0.30%, Si: 0.10-0.40%, Mn: 1.20-2.0%, Ti: 0.02 to 0.10%, Nb: 0.010-0.050%, Cr: 0.10 to 0.50 percent of Fe, less than or equal to 0.012 percent of P, less than or equal to 0.0090 percent of S, more than or equal to 0.030 percent of Als, less than or equal to 0.0070 percent of N, less than or equal to 0.0015 percent of B, and the balance of Fe and inevitable impurities.
The thickness of the low-alloy high-strength steel plate is 0.9-2.5mm, and the width is 900-1550 mm.
The low-alloy high-strength steel plate provided by the invention has a structure of pearlite and ferrite, wherein the pearlite accounts for 7-15%.
The low-alloy high-strength steel plate has the following properties: tensile strength: 950-: 800-950MPa, A80: not less than 10.0%, hole expansion ratio: 25-40%, cold bending: not less than 2a (a is the thickness of the strip steel).
The invention also provides a preparation method of the low-alloy high-strength steel plate with the high performance of more than 800MPa, which comprises the working procedures of hot rolling, cold rolling and tempering; the hot rolling procedure comprises the hot rolling finishing temperature of 840-890 ℃ and the coiling temperature of 610-650 ℃.
In the cold rolling process, the heating and soaking temperatures of the cold rolling strip steel are controlled to be 810-845 ℃, the processes of quick cooling and then natural cooling are adopted, the quick cooling speed is more than or equal to 27 ℃/s, the quick cooling ending temperature is 300-845 ℃, and the natural cooling final cooling temperature is less than or equal to 150 ℃.
In the tempering process, the tempering temperature is 285-415 ℃, and the tempering time is 10-40 min.
The standard of the low-alloy high-strength steel plate product with the high performance of above 800MPa is referred to GB/T20564.4-2010; the product performance detection method is in standard reference GB/T228.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: 1. according to the invention, by innovating chemical component design and hot rolling, cold rolling and tempering processes, the performance indexes of the produced low-alloy high-strength steel plate such as structure, elongation and hole expansion rate are further improved and homogenized, and the processing formability of the product is greatly improved. 2. The low-alloy high-strength steel plate with the high performance of more than 800MPa has the following properties: tensile strength: 950-: 800-950MPa, A80: not less than 10.0%, hole expansion ratio: 25-40%, cold bending: not less than 2a (a is the thickness of the strip steel).
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
The specification of the low-alloy high-strength steel plate with the high performance of more than 800MPa grade of the embodiment is 0.9 multiplied by 1250mm, and the chemical composition and the mass percentage content are shown in Table 1.
The preparation method of the low-alloy high-strength steel plate with the high performance of above 800MPa comprises the working procedures of hot rolling, cold rolling and tempering, and the specific process steps are as follows:
(1) a hot rolling procedure: the hot rolling finishing temperature is 890 ℃, and the coiling temperature is 650 ℃;
(2) a cold rolling procedure: controlling the heating temperature of the strip steel at 810 ℃ and the soaking temperature at 810 ℃ by cold rolling, and adopting the processes of firstly fast cooling and then natural cooling, wherein the fast cooling speed is 57 ℃/s, the fast cooling finishing temperature is 300 ℃, and the natural cooling final cooling temperature is 130 ℃;
(3) a tempering procedure: the tempering temperature of the low-alloy high-strength steel plate is 400 ℃, and the tempering time is 23 min.
In the embodiment, the structure of the low-alloy high-strength steel plate with the high performance of above 800MPa level is pearlite + ferrite, and the pearlite accounts for 11%.
The performance indexes of the low-alloy high-strength steel plate with the high performance of more than 800MPa are shown in Table 2.
Example 2
The specification of the low-alloy high-strength steel plate with the high performance of more than 800MPa grade of the embodiment is 1.0 multiplied by 1250mm, and the chemical composition and the mass percentage content are shown in Table 1.
The preparation method of the low-alloy high-strength steel plate with the high performance of above 800MPa comprises the working procedures of hot rolling, cold rolling and tempering, and the specific process steps are as follows:
(1) a hot rolling procedure: the hot rolling finishing temperature is 880 ℃, and the coiling temperature is 650 ℃;
(2) a cold rolling procedure: cold rolling, wherein the heating temperature of the strip steel is controlled to be 825 ℃, the soaking temperature is controlled to be 815 ℃, the processes of rapid cooling and then natural cooling are adopted, the rapid cooling speed is 52 ℃/s, the rapid cooling ending temperature is 307 ℃, and the natural cooling final cooling temperature is 130 ℃;
(3) a tempering procedure: the tempering temperature of the low-alloy high-strength steel plate is 410 ℃, and the tempering time is 20 min.
In the embodiment, the structure of the low-alloy high-strength steel plate with the high performance of above 800MPa level is pearlite + ferrite, and the pearlite accounts for 8%.
The performance indexes of the low-alloy high-strength steel plate with the high performance of more than 800MPa are shown in Table 2.
Example 3
The specification of the low-alloy high-strength steel plate with the high performance of more than 800MPa grade of the embodiment is 1.2 multiplied by 1250mm, and the chemical composition and the mass percentage content are shown in Table 1.
The preparation method of the low-alloy high-strength steel plate with the high performance of above 800MPa comprises the working procedures of hot rolling, cold rolling and tempering, and the specific process steps are as follows:
(1) a hot rolling procedure: the hot rolling finishing temperature is 870 ℃, and the coiling temperature is 650 ℃;
(2) a cold rolling procedure: controlling the heating temperature of the strip steel at 830 ℃ and the soaking temperature at 815 ℃ by cold rolling, and adopting a process of firstly quickly cooling and then naturally cooling, wherein the quick cooling speed is 47 ℃/s, the quick cooling finishing temperature is 310 ℃, and the naturally cooling final cooling temperature is 132 ℃;
(3) a tempering procedure: the tempering temperature of the low-alloy high-strength steel plate is 405 ℃, and the tempering time is 28 min.
In the embodiment, the structure of the low-alloy high-strength steel plate with the high performance of above 800MPa level is pearlite + ferrite, and the pearlite accounts for 13%.
The performance indexes of the low-alloy high-strength steel plate with the high performance of more than 800MPa are shown in Table 2.
Example 4
The specification of the low-alloy high-strength steel plate with the high performance of more than 800MPa grade of the embodiment is 1.4 multiplied by 1250mm, and the chemical composition and the mass percentage content are shown in Table 1.
The preparation method of the low-alloy high-strength steel plate with the high performance of above 800MPa comprises the working procedures of hot rolling, cold rolling and tempering, and the specific process steps are as follows:
(1) a hot rolling procedure: the hot rolling finishing temperature is 860 ℃, and the coiling temperature is 640 ℃;
(2) a cold rolling procedure: controlling the heating temperature of the strip steel to be 840 ℃ and the soaking temperature to be 820 ℃ in cold rolling, adopting the processes of firstly fast cooling and then naturally cooling, wherein the fast cooling speed is 45 ℃/s, the fast cooling ending temperature is 313 ℃, and the naturally cooling final cooling temperature is 135 ℃;
(3) a tempering procedure: the tempering temperature of the low-alloy high-strength steel plate is 403 ℃ and the tempering time is 30 min.
In the embodiment, the structure of the low-alloy high-strength steel plate with the high performance of above 800MPa is pearlite + ferrite, and the pearlite accounts for 12%.
The performance indexes of the low-alloy high-strength steel plate with the high performance of more than 800MPa are shown in Table 2.
Example 5
The specification of the low-alloy high-strength steel plate with the high performance of more than 800MPa grade of the embodiment is 1.6 multiplied by 1050mm, and the chemical component composition and the mass percentage content are shown in Table 1.
The preparation method of the low-alloy high-strength steel plate with the high performance of above 800MPa comprises the working procedures of hot rolling, cold rolling and tempering, and the specific process steps are as follows:
(1) a hot rolling procedure: the hot rolling finishing temperature is 850 ℃, and the coiling temperature is 640 ℃;
(2) a cold rolling procedure: controlling the heating temperature of the strip steel to be 837 ℃ and the soaking temperature to be 822 ℃ in cold rolling, adopting the processes of firstly fast cooling and then naturally cooling, wherein the fast cooling speed is 43 ℃/s, the fast cooling ending temperature is 316 ℃, and the naturally cooling final cooling temperature is 140 ℃;
(3) a tempering procedure: the tempering temperature of the low-alloy high-strength steel plate is 398 ℃, and the tempering time is 33 min.
In the embodiment, the structure of the low-alloy high-strength steel plate with the high performance of above 800MPa is pearlite + ferrite, and the pearlite accounts for 9%.
The performance indexes of the low-alloy high-strength steel plate with the high performance of more than 800MPa are shown in Table 2.
Example 6
The specification of the low-alloy high-strength steel plate with the high performance of more than 800MPa grade of the embodiment is 1.8 multiplied by 1250mm, and the chemical composition and the mass percentage content are shown in Table 1.
The preparation method of the low-alloy high-strength steel plate with the high performance of above 800MPa comprises the working procedures of hot rolling, cold rolling and tempering, and the specific process steps are as follows:
(1) a hot rolling procedure: the hot rolling finishing temperature is 850 ℃, and the coiling temperature is 620 ℃;
(2) a cold rolling procedure: controlling the heating temperature of the strip steel by cold rolling to be 841 ℃ and the soaking temperature to be 830 ℃, adopting the processes of firstly fast cooling and then naturally cooling, wherein the fast cooling speed is 39 ℃/s, the fast cooling finishing temperature is 319 ℃, and the naturally cooling finishing temperature is 145 ℃;
(3) a tempering procedure: the tempering temperature of the low-alloy high-strength steel plate is 395 ℃ and the tempering time is 36 min.
In the embodiment, the structure of the low-alloy high-strength steel plate with the high performance of above 800MPa level is pearlite + ferrite, and the pearlite accounts for 11%.
The performance indexes of the low-alloy high-strength steel plate with the high performance of more than 800MPa are shown in Table 2.
Example 7
The specification of the low-alloy high-strength steel plate with the high performance of more than 800MPa grade of the embodiment is 2.0 multiplied by 1150mm, and the chemical composition and the mass percentage content are shown in Table 1.
The preparation method of the low-alloy high-strength steel plate with the high performance of above 800MPa comprises the working procedures of hot rolling, cold rolling and tempering, and the specific process steps are as follows:
(1) a hot rolling procedure: the hot rolling finishing temperature is 840 ℃, and the coiling temperature is 620 ℃;
(2) a cold rolling procedure: the heating temperature of the cold-rolled control strip steel is 845 ℃, the soaking temperature is 835 ℃, the processes of quick cooling and then natural cooling are adopted, the quick cooling speed is 35 ℃/s, the quick cooling ending temperature is 321 ℃, and the natural cooling final cooling temperature is 140 ℃;
(3) a tempering procedure: the tempering temperature of the low-alloy high-strength steel plate is 393 ℃ and the tempering time is 38 min.
In the embodiment, the structure of the low-alloy high-strength steel plate with the high performance of above 800MPa level is pearlite + ferrite, and the pearlite accounts for 10%.
The performance indexes of the low-alloy high-strength steel plate with the high performance of more than 800MPa are shown in Table 2.
Example 8
The specification of the low-alloy high-strength steel plate with the high performance of more than 800MPa grade of the embodiment is 2.3 multiplied by 1250mm, and the chemical composition and the mass percentage content are shown in Table 1.
The preparation method of the low-alloy high-strength steel plate with the high performance of above 800MPa comprises the working procedures of hot rolling, cold rolling and tempering, and the specific process steps are as follows:
(1) a hot rolling procedure: the hot rolling finishing temperature is 840 ℃, and the coiling temperature is 610 ℃;
(2) the cold rolling procedure is to control the heating temperature of the strip steel to 845 ℃ and the soaking temperature to 845 ℃, and adopt the processes of firstly fast cooling and then natural cooling, wherein the fast cooling speed is 30 ℃/s, the fast cooling ending temperature is 323 ℃, and the natural cooling final cooling temperature is 147 ℃;
(3) a tempering procedure: the tempering temperature of the low-alloy high-strength steel plate is 390 ℃, and the tempering time is 40 min.
In the embodiment, the structure of the low-alloy high-strength steel plate with the high performance of above 800MPa is pearlite + ferrite, and the pearlite accounts for 14%.
The performance indexes of the low-alloy high-strength steel plate with the high performance of more than 800MPa are shown in Table 2.
Example 9
The specification of the low-alloy high-strength steel plate with the high performance of more than 800MPa grade of the embodiment is 2.5 multiplied by 1250mm, and the chemical composition and the mass percentage content are shown in Table 1.
The preparation method of the low-alloy high-strength steel plate with the high performance of above 800MPa comprises the working procedures of hot rolling, cold rolling and tempering, and the specific process steps are as follows:
(1) a hot rolling procedure: the hot rolling finishing temperature is 840 ℃, and the coiling temperature is 610 ℃;
(2) a cold rolling procedure: controlling the heating temperature of the strip steel 843 ℃ and the soaking temperature of the strip steel 838 ℃ in cold rolling, adopting the processes of quick cooling and then natural cooling, wherein the quick cooling speed is 27 ℃/s, the quick cooling ending temperature is 325 ℃, and the natural cooling final cooling temperature is 150 ℃;
(3) a tempering procedure: the tempering temperature of the low-alloy high-strength steel plate is 290 ℃, and the tempering time is 17 min.
In the embodiment, the structure of the low-alloy high-strength steel plate with the high performance of above 800MPa level is pearlite + ferrite, and the pearlite accounts for 7%.
The performance indexes of the low-alloy high-strength steel plate with the high performance of more than 800MPa are shown in Table 2.
Example 10
The specification of the low-alloy high-strength steel plate with the high performance of more than 800MPa grade of the embodiment is 2.0 multiplied by 1000mm, and the chemical composition and the mass percentage content are shown in Table 1.
The preparation method of the low-alloy high-strength steel plate with the high performance of above 800MPa comprises the working procedures of hot rolling, cold rolling and tempering, and the specific process steps are as follows:
(1) a hot rolling procedure: the hot rolling finishing temperature is 840 ℃, and the coiling temperature is 620 ℃;
(2) a cold rolling procedure: controlling the heating temperature of the strip steel to be 840 ℃ and the soaking temperature to be 835 ℃, adopting the processes of firstly fast cooling and then naturally cooling, wherein the fast cooling speed is 35 ℃/s, the fast cooling finishing temperature is 328 ℃, and the naturally cooling final cooling temperature is 147 ℃;
(3) a tempering procedure: the tempering temperature of the low-alloy high-strength steel plate is 285 ℃, and the tempering time is 30 min.
In the embodiment, the structure of the low-alloy high-strength steel plate with the high performance of above 800MPa is pearlite + ferrite, and the pearlite accounts for 15%.
The performance indexes of the low-alloy high-strength steel plate with the high performance of more than 800MPa are shown in Table 2.
Example 11
The specification of the low-alloy high-strength steel plate with the high performance of more than 800MPa grade of the embodiment is 1.6 multiplied by 1250mm, and the chemical composition and the mass percentage content are shown in Table 1.
The preparation method of the low-alloy high-strength steel plate with the high performance of above 800MPa comprises the working procedures of hot rolling, cold rolling and tempering, and the specific process steps are as follows:
(1) a hot rolling procedure: the hot rolling finishing temperature is 850 ℃, and the coiling temperature is 640 ℃;
(2) a cold rolling procedure: controlling the heating temperature of the strip steel at 829 ℃ and the soaking temperature of the cold rolling at 820 ℃, adopting the processes of quick cooling and then natural cooling, wherein the quick cooling speed is 43 ℃/s, the quick cooling ending temperature is 338 ℃, and the natural cooling final cooling temperature is 140 ℃;
(3) a tempering procedure: the tempering temperature of the low-alloy high-strength steel plate is 303 ℃, and the tempering time is 10 min.
In the embodiment, the structure of the low-alloy high-strength steel plate with the high performance of above 800MPa level is pearlite + ferrite, and the pearlite accounts for 12.5%.
The performance indexes of the low-alloy high-strength steel plate with the high performance of more than 800MPa are shown in Table 2.
Example 12
The specification of the low-alloy high-strength steel plate with the high performance of more than 800MPa grade of the embodiment is 1.2 multiplied by 900mm, and the chemical component composition and the mass percentage content are shown in Table 1.
The preparation method of the low-alloy high-strength steel plate with the high performance of above 800MPa comprises the working procedures of hot rolling, cold rolling and tempering, and the specific process steps are as follows:
(1) a hot rolling procedure: the hot rolling finishing temperature is 870 ℃, and the coiling temperature is 650 ℃;
(2) a cold rolling procedure: controlling the heating temperature of the strip steel to 819 ℃ and the soaking temperature to 815 ℃ in cold rolling, and adopting the processes of quick cooling and then natural cooling, wherein the quick cooling speed is 47 ℃/s, the quick cooling finishing temperature is 335 ℃, and the natural cooling finishing temperature is 130 ℃;
(3) a tempering procedure: the tempering temperature of the low-alloy high-strength steel plate is 305 ℃ and the tempering time is 15 min.
In the embodiment, the structure of the low-alloy high-strength steel plate with the high performance of above 800MPa level is pearlite + ferrite, and the pearlite accounts for 9.8%.
The performance indexes of the low-alloy high-strength steel plate with the high performance of more than 800MPa are shown in Table 2.
Example 13
The specification of the low-alloy high-strength steel plate with the high performance of more than 800MPa grade of the embodiment is 1.0 multiplied by 1550mm, and the chemical composition and the mass percentage content are shown in Table 1.
The preparation method of the low-alloy high-strength steel plate with the high performance of above 800MPa comprises the working procedures of hot rolling, cold rolling and tempering, and the specific process steps are as follows:
(1) a hot rolling procedure: the hot rolling finishing temperature is 880 ℃, and the coiling temperature is 650 ℃;
(2) a cold rolling procedure: cold rolling, wherein the heating temperature of the strip steel is controlled to be 831 ℃ and the soaking temperature is controlled to be 815 ℃, the processes of quick cooling and then natural cooling are adopted, the quick cooling speed is 52 ℃/s, the quick cooling finishing temperature is 332 ℃, and the natural cooling finishing temperature is 141 ℃;
(3) a tempering procedure: the tempering temperature of the low-alloy high-strength steel plate is 385 ℃, and the tempering time is 30 min.
In the embodiment, the structure of the low-alloy high-strength steel plate with the high performance of above 800MPa level is pearlite + ferrite, and the pearlite accounts for 7.5%.
The performance indexes of the low-alloy high-strength steel plate with the high performance of more than 800MPa are shown in Table 2.
Example 14
The specification of the low-alloy high-strength steel plate with the high performance of more than 800MPa grade of the embodiment is 1.4 multiplied by 1250mm, and the chemical composition and the mass percentage content are shown in Table 1.
The preparation method of the low-alloy high-strength steel plate with the high performance of above 800MPa comprises the working procedures of hot rolling, cold rolling and tempering, and the specific process steps are as follows:
(1) a hot rolling procedure: the hot rolling finishing temperature is 860 ℃, and the coiling temperature is 640 ℃;
(2) a cold rolling procedure: controlling the heating temperature of the strip steel to be 840 ℃ and the soaking temperature to be 820 ℃ in cold rolling, adopting the processes of firstly fast cooling and then naturally cooling, wherein the fast cooling speed is 45 ℃/s, the fast cooling finishing temperature is 336 ℃, and the naturally cooling final cooling temperature is 120 ℃;
(3) a tempering procedure: the tempering temperature of the low-alloy high-strength steel plate is 310 ℃, and the tempering time is 11 min.
In the embodiment, the structure of the low-alloy high-strength steel plate with the high performance of above 800MPa level is pearlite + ferrite, and the pearlite accounts for 11%.
The performance indexes of the low-alloy high-strength steel plate with the high performance of more than 800MPa are shown in Table 2.
Example 15
The specification of the low-alloy high-strength steel plate with the high performance of more than 800MPa grade of the embodiment is 2.5 multiplied by 1250mm, and the chemical composition and the mass percentage content are shown in Table 1.
The preparation method of the low-alloy high-strength steel plate with the high performance of above 800MPa comprises the working procedures of hot rolling, cold rolling and tempering, and the specific process steps are as follows:
(1) a hot rolling procedure: the hot rolling finishing temperature is 840 ℃ and the coiling temperature is 650 ℃;
(2) a cold rolling procedure: controlling the heating temperature of the strip steel to 845 ℃ and the soaking temperature to 810 ℃ in cold rolling, adopting the processes of firstly fast cooling and then naturally cooling, wherein the fast cooling speed is 27 ℃/s, the fast cooling finishing temperature is 340 ℃, and the naturally cooling final cooling temperature is 150 ℃;
(3) a tempering procedure: the tempering temperature of the low-alloy high-strength steel plate is 415 ℃, and the tempering time is 35 min.
In the embodiment, the structure of the low-alloy high-strength steel plate with the high performance of above 800MPa level is pearlite + ferrite, and the pearlite accounts for 8%.
The performance indexes of the low-alloy high-strength steel plate with the high performance of more than 800MPa are shown in Table 2.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Table 1 examples 1-15 chemical composition and mass% of low alloy high strength steel sheet having high performance of 800MPa or more
The balance of the ingredients in table 1 is Fe and unavoidable impurities.
TABLE 2 examples 1-15 Performance indices of high Performance Low alloy high Strength Steel plates above 800MPa
Claims (6)
1. A low-alloy high-strength steel plate with high performance of more than 800MPa is characterized by comprising the following chemical components in percentage by mass: c: 0.15-0.30%, Si: 0.10-0.40%, Mn: 1.20-2.0%, Ti: 0.02 to 0.10%, Nb: 0.010-0.050%, Cr: 0.10 to 0.50 percent of Fe, less than or equal to 0.012 percent of P, less than or equal to 0.0090 percent of S, more than or equal to 0.030 percent of Als, less than or equal to 0.0070 percent of N, less than or equal to 0.0015 percent of B, and the balance of Fe and inevitable impurities;
the pearlite proportion of the low-alloy high-strength steel plate is 7-15%;
the performance of the low-alloy high-strength steel plate is as follows: a80: not less than 10.0%, hole expansion ratio: 25-40%, cold bending: more than or equal to 2a (a is the thickness of the strip steel);
a preparation method of a low-alloy high-strength steel plate with high performance of more than 800MPa comprises the working procedures of hot rolling, cold rolling and tempering; the hot rolling procedure comprises the steps of hot rolling finishing temperature of 840-890 ℃ and coiling temperature of 610-650 ℃;
in the cold rolling procedure, the heating and soaking temperatures of the cold rolling strip steel are controlled to be 810-845 ℃, the processes of firstly fast cooling and then natural cooling are adopted, the fast cooling speed is more than or equal to 27 ℃/s, the fast cooling ending temperature is 300-845 ℃, and the natural cooling final cooling temperature is less than or equal to 150 ℃.
2. The low-alloy high-strength steel plate with the high performance of more than 800MPa grade as claimed in claim 1, wherein the thickness of the low-alloy high-strength steel plate is 0.9-2.5mm, and the width is 900-1550 mm.
3. The low-alloy high-strength steel sheet with high performance of 800MPa or higher according to claim 1, wherein the low-alloy high-strength steel sheet has a pearlite + ferrite structure.
4. The low-alloy high-strength steel sheet with high performance of 800MPa or more according to claim 1, wherein the low-alloy high-strength steel sheet has the following properties: tensile strength: 950-: 800-950 MPa.
5. The method for preparing the low-alloy high-strength steel plate with the high performance of more than 800MPa is characterized by comprising the working procedures of hot rolling, cold rolling and tempering according to any one of claims 1 to 4; the hot rolling procedure comprises the steps of hot rolling finishing temperature of 840-890 ℃ and coiling temperature of 610-650 ℃;
in the cold rolling procedure, the heating and soaking temperatures of the cold rolling strip steel are controlled to be 810-845 ℃, the processes of firstly fast cooling and then natural cooling are adopted, the fast cooling speed is more than or equal to 27 ℃/s, the fast cooling ending temperature is 300-845 ℃, and the natural cooling final cooling temperature is less than or equal to 150 ℃.
6. The method for preparing the low-alloy high-strength steel plate with the high performance of more than 800MPa grade according to claim 5, wherein the tempering process comprises the tempering temperature of 285-415 ℃ and the tempering time of 10-40 min.
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