CN116200677A - High-strength hot-rolled coiled plate with tensile strength of 1100MPa for frame and manufacturing method thereof - Google Patents
High-strength hot-rolled coiled plate with tensile strength of 1100MPa for frame and manufacturing method thereof Download PDFInfo
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- CN116200677A CN116200677A CN202211617806.6A CN202211617806A CN116200677A CN 116200677 A CN116200677 A CN 116200677A CN 202211617806 A CN202211617806 A CN 202211617806A CN 116200677 A CN116200677 A CN 116200677A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 4
- 238000005096 rolling process Methods 0.000 claims description 64
- 230000009467 reduction Effects 0.000 claims description 31
- 238000001816 cooling Methods 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 15
- 238000007664 blowing Methods 0.000 claims description 8
- 238000007670 refining Methods 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 238000009749 continuous casting Methods 0.000 claims description 5
- 238000005496 tempering Methods 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 abstract description 34
- 239000010959 steel Substances 0.000 abstract description 34
- 239000013585 weight reducing agent Substances 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 238000005098 hot rolling Methods 0.000 description 6
- 239000002893 slag Substances 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 238000010791 quenching Methods 0.000 description 4
- 230000000171 quenching effect Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 238000010079 rubber tapping Methods 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910000616 Ferromanganese Inorganic materials 0.000 description 1
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 229910001200 Ferrotitanium Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
- C22C38/02—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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention belongs to the technical field of metallurgical production, and particularly relates to a high-strength hot-rolled coil with tensile strength of 1100MPa for a frame and a manufacturing method thereof. The hot rolled coil comprises the following chemical components in percentage by mass: c:0.2% -0.4%, si:0.2% -0.35%, mn:0.65% -1%, S: less than or equal to 0.02 percent, P: less than or equal to 0.03 percent of Al:0.01% -0.05%, B0.001-0.004%, ti:0.01-0.05%, cr:0.1 to 0.25 percent, N is less than or equal to 0.007 percent, and the balance is Fe and other unavoidable impurities. The high-strength steel for the 1100 MPa-level frame, produced by the invention, has the advantages that all mechanical properties meet the requirements, the cost is well controlled, the high-strength steel is used on a new energy automobile, the weight reduction of the new energy automobile body is further realized, and the defect of insufficient endurance of the new energy automobile is solved to a certain extent.
Description
Technical Field
The invention belongs to the technical field of metallurgical production, and particularly relates to a high-strength hot-rolled coil with tensile strength of 1100MPa for a frame and a manufacturing method thereof.
Background
In recent years, new energy automobiles are vigorously developed, and each cart enterprise promotes new energy automobile products, and continues to voyage to become a problem to be solved in the new energy automobiles, so that the requirements on the weight reduction of the automobiles are further improved, and the ultrahigh-strength hot-rolled steel plate is a new hot spot in the field of high-strength steel. All large steel factories are actively laid out on ultra-high strength steel with tensile strength of more than 1100MPa, and the ultra-high strength of the hot rolled steel plate is achieved by adopting different system alloy element composite strengthening and subsequent heat treatment modes in the large steel factories such as national treasures, first steel and the like.
Disclosure of Invention
The invention aims to provide a high-strength hot-rolled coil plate with tensile strength of 1100MPa for a frame and a manufacturing method thereof, so as to realize the weight reduction of a new energy automobile body, reduce the production cost and improve the endurance and the overall reliability of the automobile.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
the invention provides a high-strength hot-rolled coil with 1100 MPa-level tensile strength for a frame, which comprises the following chemical components in percentage by mass: c:0.2% -0.4%, si:0.2% -0.35%, mn:0.65% -1%, S: less than or equal to 0.02 percent, P: less than or equal to 0.03 percent of Al:0.01% -0.05%, B0.001-0.004%, ti:0.01-0.05%, cr:0.1 to 0.25 percent, N is less than or equal to 0.007 percent, and the balance is Fe and other unavoidable impurities.
In the technical scheme, further, the thickness of the hot rolled coil is 1.5-5.0mm.
In the above technical scheme, further, the hot rolled coil has mechanical properties: the tensile strength is more than or equal to 1100MPa, the yield strength is more than or equal to 950MPa, and the elongation is more than or equal to 9.0%.
The invention also provides a manufacturing method of the high-strength hot-rolled coil with the tensile strength of 1100MPa for the frame, which comprises the following steps:
(1) Molten iron pretreatment is put into a furnace, and a plate blank is formed after the procedures of converter combined blowing, LF refining and plate blank continuous casting;
(2) The plate blank is put into a heating furnace, the furnace outlet temperature of the heating furnace is 1200-1250 ℃, and the furnace time is 155-190min;
(3) The rough rolling pass adopts a 3+3 mode, namely R1 is rolled back and forth for 3 times, R2 is rolled back and forth for 3 times, and the thickness of the rough rolling intermediate billet is 30-35mm;
(4) The initial rolling temperature of the finish rolling is 1000-1080 ℃, the final rolling temperature is 860-900 ℃, and the finish rolling is carried out until the thickness is 1.5-5.0mm;
(5) Cooling to coiling temperature by adopting a discontinuous cooling mode;
(6) And (5) coiling after cooling, wherein the coiling temperature is controlled to be 660-700 ℃.
(7) Heating to 805-950 ℃ along with the furnace after coiling, preserving heat for 3-8h, tempering at 180-250 ℃ and preserving heat for 10-20min.
In the technical scheme, in the rough rolling process, R1 is rolled back and forth for 3 times, the rolling reduction rate of each pass is less than or equal to 25%, R2 is rolled back and forth for 3 times, the rolling reduction rate of each pass is 30% -45%, and the total rolling reduction rate is more than 80%.
In the technical proposal, in the finish rolling process, F1 and F2 pass reduction is more than or equal to 40 percent, F3-F7 reduction is 10 percent to 40 percent, and total reduction is more than 85 percent
In the technical scheme, further, in the rough rolling and finish rolling processes, dephosphorization is carried out after each pass of rolling, and the pressure is more than 210bar.
The steelmaking process requires:
a. the mass percentage of the raw material molten iron S is less than or equal to 0.030 percent, slag is scraped, and refined scrap steel is adopted;
b. the red tank is subjected to steel, so that the air permeability and self-casting property of the steel ladle are ensured, the steel ladle is clean and has no residual steel and residues, and the use of the steel ladle needs to consider calcium feeding;
c. the converter carbon drawing reaches the design range once, point blowing is avoided, low-carbon low-phosphorus ferromanganese, ferrosilicon and ferrotitanium are adopted for tapping, argon of a ladle is purged before tapping, a tapping hole is controlled, scattering is avoided, and ladle Als is controlled according to 0.015-0.060%; the steel ladle N is required to be less than or equal to 25ppm, slag is blocked, steel is tapped, and the slag quantity entering the steel ladle is strictly controlled;
d. the refining requires that LF treatment process keeps micro positive pressure, LF is strictly controlled to increase N, the amount of N is required to be less than or equal to 10ppm, LF adopts active lime and fluorite to produce reducing slag with good fluidity, the argon blowing intensity is strictly controlled, molten steel is prevented from being exposed as much as possible, calcium treatment is carried out after RH treatment, soft blowing time is increased, inclusions in the molten steel are strictly controlled, and gas samples are taken before and after refining for N, O content analysis.
e. The whole process of protection pouring is carried out, gas sample analysis N, O is adopted, argon purging is adopted before pouring, no molten steel is exposed in the pouring process, water gap N absorption is strictly controlled, N is controlled to be less than or equal to 5ppm, high alkalinity middle ladle slag is adopted, so that impurities in steel are removed, soft reduction function is put into the steel pouring process, the constant pulling speed is kept in the steel pouring process, the middle ladle is controlled according to the superheat degree of less than or equal to 30 ℃, the whole part of a casting blank is in a line, heap cooling is adopted, slow cooling of the casting blank is guaranteed, and rolling is carried out after 72 hours.
The beneficial effects of the invention are as follows:
(1) The chemical components of the hot rolled coil plate are reinforced by Cr element, the quenching degree is improved, the cost is controlled, the Ti element is added for reinforcement, and the mechanical property of the steel is further improved by utilizing the precipitation strengthening effect of the Ti element.
(2) The invention improves the final rolling temperature, reasonably distributes the rolling force and other processes, improves the curling temperature and ensures that the steel has good forming performance before heat treatment.
The high-strength steel for the 1100 MPa-level frame, produced by the invention, has the advantages that all mechanical properties meet the requirements, the cost is well controlled, the high-strength steel is used on a new energy automobile, the weight reduction of the new energy automobile body is further realized, and the defect of insufficient endurance of the new energy automobile is solved to a certain extent.
Drawings
FIG. 1 is a flow chart of a process for manufacturing a hot rolled coil according to the present invention;
fig. 2 is a photograph of metallographic structure of a rolled plate of BG1100HS according to example 1 of the present invention;
fig. 3 is a photograph of metallographic structure of a rolled plate of example 2BG1100HS according to the present invention;
fig. 4 is a photograph showing metallographic structure of a rolled plate of example 3BG1100HS according to the present invention.
Detailed Description
The following examples will enable those of ordinary skill in the art to more fully understand the invention and are not intended to limit the invention in any way.
Example 1
The present example further illustrates the present invention using the high-strength steel BG1100HS for vehicle frames, which is produced by the present steel sheet stock company, with a product specification of 2.0mm x 1250 mm.
The hot-rolled coil for the frame of the embodiment comprises the following components in percentage by weight: c0.28%, si:0.26%, mn:0.77%, P:0.013%, S:0.003%, al:0.024%, B:0.0017%, ti 0.039%, cr 0.14%, N0.0052%, and the balance Fe and unavoidable impurities.
The production route of the hot rolled coil for the frame of the embodiment comprises molten iron pretreatment, converter combined blowing, LF refining, slab continuous casting, hot rolling, intermittent cooling, coiling and heat treatment.
And (3) hot rolling: the furnace outlet temperature of the heating furnace is 1269 ℃, and the furnace time is 171min; the rough rolling pass adopts a '3+3' mode, the outlet temperature of rough rolling R1 is 1043 ℃, the outlet temperature of R2 is 1128 ℃, R1 is rolled back and forth for 3 times, the rolling reduction rate of each pass is 15%, 20% and 21%, R2 is rolled back and forth for 3 times, the rolling reduction rate of each pass is 30%, 37% and 45%, the total rolling reduction rate is 87%, and the thickness of an intermediate blank is 30mm; the inlet temperature of finish rolling F1 is 1053 ℃, the finish rolling temperature is 885 ℃, the F1 and F2 pass reduction rates are 50%, 44%, F3-F7 reduction rates are 37%, 29%, 25%, 19% and 13%, the total reduction rate is 93.3%, and the finish rolling is carried out until the thickness is 2mm; dephosphorization is carried out in each pass of rough rolling and finish rolling, and the water pressure is 230bar;
and (5) intermittent cooling: after finishing finish rolling, cooling to the coiling temperature by adopting an intermittent cooling mode;
and (3) coiling: coiling after cooling, wherein the coiling temperature is controlled to be 632 ℃;
and (3) heat treatment: heating along with the furnace, quenching at 860 ℃, preserving heat for 5 minutes, tempering at 200 ℃, and preserving heat for 15 minutes.
The hot rolled coil produced according to the procedure of this example has the performance index shown in Table 1 and the metallographic structure shown in FIG. 2.
TABLE 1
As can be seen from the table, the hot rolled coil for the vehicle frame produced by the embodiment meets the mechanical property requirements of strength, plasticity, toughness and the like, and as can be seen from fig. 2, the metallographic structure of the embodiment is mainly martensite.
Example 2
In this example, the present invention will be further described using a hot rolled sheet BG1100HS for a vehicle frame as an example of the product specification produced by the present steel sheet stock limited company being 2.5mm x 1500 mm.
The hot-rolled coil for the frame of the embodiment comprises the following components in percentage by weight: c0.26%, si:0.23%, mn:0.73%, P:0.009%, S:0.001%, al:0.038%, B:0.0019%, ti 0.038%, cr 0.14%, N:0.0045% and the balance Fe and unavoidable impurities.
The production route of the hot rolled coil for the frame of the embodiment comprises molten iron pretreatment, converter combined blowing, LF refining, slab continuous casting, hot rolling, intermittent cooling, coiling and heat treatment.
And (3) hot rolling: the furnace outlet temperature of the heating furnace is 1280 ℃ and the furnace time is 168min; the rough rolling pass adopts a '3+3' mode, the outlet temperature of rough rolling R1 is 1034 ℃, the outlet temperature of R2 is 1116 ℃, R1 is rolled back and forth for 3 times, the rolling reduction rate of each pass is 15%, 17% and 19%, R2 is rolled back and forth for 3 times, the rolling reduction rate of each pass is 30%, 36% and 43%, the total rolling reduction rate is 85.7%, and the thickness of an intermediate blank is 33mm; the inlet temperature of finish rolling F1 is 1043 ℃, the finish rolling temperature is 910 ℃, the F1 and F2 pass reduction rates are 48 percent, 43 percent, the F3-F7 reduction rates are 36 percent, 28 percent, 23 percent, 17 percent and 12 percent, the total reduction rate is 92.4 percent, and the finish rolling is carried out until the thickness is 2.5mm; dephosphorization is carried out in each pass of rough rolling and finish rolling, and the water pressure is 235bar;
and (5) intermittent cooling: after finishing finish rolling, cooling to the coiling temperature by adopting an intermittent cooling mode;
and (3) coiling: coiling after cooling, and controlling the coiling temperature to be 675 ℃;
and (3) heat treatment: heating along with the furnace, quenching at 900 ℃, preserving heat for 5 minutes, tempering at 220 ℃, and preserving heat for 15 minutes.
The steel strip produced according to the procedure of this example has the performance index shown in Table 2 and the metallographic structure shown in FIG. 3.
TABLE 2
As can be seen from the table, the hot rolled coil for the rack produced in the embodiment meets the mechanical property requirements of strength, plasticity, toughness and the like, and as can be seen from FIG. 3, the metallographic structure of the embodiment is mainly martensite.
Example 3
In this example, the present invention will be further described using the hot rolled sheet BG1100HS for a vehicle frame as an example of the product specification manufactured by the present steel sheet stock limited company of 3.0mm x 1550 mm.
The high-strength steel for the frame of the embodiment comprises the following components in percentage by weight: c0.26%, si:0.24%, mn:0.76%, P:0.014%, S:0.003%, al:0.038%, B:0.0017%, ti 0.038%, cr 0.15%, N:0.0044% and the balance Fe and unavoidable impurities.
The production route of the hot rolled coil for the frame of the embodiment comprises molten iron pretreatment, converter combined blowing, LF refining, slab continuous casting, hot rolling, intermittent cooling, coiling and heat treatment.
And (3) hot rolling: the furnace outlet temperature of the heating furnace is 1268 ℃ and the furnace time is 167min; the rough rolling pass adopts a '3+3' mode, the outlet temperature of rough rolling R1 is 1012 ℃, the outlet temperature of R2 is 1106 ℃, R1 is rolled back and forth for 3 times, the rolling reduction rate of each pass is 15%, 16%, 18% and R2 is rolled back and forth for 3 times, the rolling reduction rate of each pass is 30%, 35%, 41%, the total rolling reduction rate is 84.7%, and the thickness of an intermediate blank is 35mm; the inlet temperature of finish rolling F1 is 1047 ℃, the finish rolling temperature is 874 ℃, the F1 and F2 pass reduction rates are 46%, 40%, and F3-F7 reduction rates are 34%, 26%, 23%, 17% and 11%, the total reduction rate is 91.4%, and the finish rolling is carried out until the thickness is 3.0mm; dephosphorization is carried out in each pass of rough rolling and finish rolling, and the water pressure is 233bar;
and (5) intermittent cooling: after finishing finish rolling, cooling to the coiling temperature by adopting an intermittent cooling mode;
and (3) coiling: coiling after cooling, and controlling the coiling temperature to be 663 ℃;
and (3) heat treatment: heating along with the furnace, quenching at 920 ℃, preserving heat for 5 minutes, tempering at 240 ℃ and preserving heat for 15 minutes.
The steel strip produced according to the procedure of this example has the performance index shown in Table 3 and the metallographic structure shown in FIG. 4.
TABLE 3 Table 3
As can be seen from the table, the hot rolled coil for the vehicle frame produced in this embodiment meets the mechanical performance requirements of strength, plasticity, toughness and the like, and as can be seen from FIG. 4, the metallographic structure of this embodiment is mainly martensite.
The above examples are only preferred embodiments of the present invention and are not limiting of the implementation. The protection scope of the present invention shall be subject to the scope defined by the claims. Other variations or modifications may be made in the various forms based on the above description. Obvious variations or modifications of the embodiments are within the scope of the invention.
Claims (7)
1. The high-strength hot-rolled coil with the tensile strength of 1100MPa for the frame is characterized by comprising the following chemical components in percentage by mass: c:0.2% -0.4%, si:0.2% -0.35%, mn:0.65% -1%, S: less than or equal to 0.02 percent, P: less than or equal to 0.03 percent of Al:0.01% -0.05%, B0.001-0.004%, ti:0.01-0.05%, cr:0.1 to 0.25 percent, N is less than or equal to 0.007 percent, and the balance is Fe and other unavoidable impurities.
2. The high-strength hot-rolled coil for a vehicle frame with a tensile strength of 1100 MPa-level according to claim 1, wherein the thickness of the hot-rolled coil is 1.5-5.0mm.
3. The high-strength hot-rolled coil for a vehicle frame with a tensile strength of 1100 MPa-level according to claim 1, wherein the hot-rolled coil has mechanical properties: the tensile strength is more than or equal to 1100MPa, the yield strength is more than or equal to 950MPa, and the elongation is more than or equal to 9.0%.
4. A method of manufacturing a high strength hot rolled coil for a vehicle frame having a tensile strength of 1100MPa grade according to any one of claims 1-3, comprising the steps of:
(1) Molten iron pretreatment is put into a furnace, and a plate blank is formed after the procedures of converter combined blowing, LF refining and plate blank continuous casting;
(2) The plate blank is put into a heating furnace, the furnace outlet temperature of the heating furnace is 1200-1250 ℃, and the furnace time is 155-190min;
(3) The rough rolling pass adopts a 3+3 mode, namely R1 is rolled back and forth for 3 times, R2 is rolled back and forth for 3 times, and the thickness of the rough rolling intermediate billet is 30-35mm;
(4) The initial rolling temperature of the finish rolling is 1000-1080 ℃, the final rolling temperature is 860-900 ℃, and the finish rolling is carried out until the thickness is 1.5-5.0mm;
(5) Cooling to coiling temperature by adopting a discontinuous cooling mode;
(6) And (5) coiling after cooling, wherein the coiling temperature is controlled to be 660-700 ℃.
(7) Heating to 805-950 ℃ along with the furnace after coiling, preserving heat for 3-8h, tempering at 180-250 ℃ and preserving heat for 10-20min.
5. The method according to claim 4, wherein in the rough rolling step, R1 is rolled back and forth 3 times, the rolling reduction rate is less than or equal to 25% per pass, R2 is rolled back and forth 3 times, the rolling reduction rate is 30% -45% per pass, and the total rolling reduction rate is > 80%.
6. The method according to claim 4, wherein in the finish rolling step, F1 and F2 pass reduction is not less than 40%, F3 to F7 reduction is 10% to 40%, and total reduction is > 85%.
7. The method according to claim 5, wherein the dephosphorization is performed after each pass of rolling in the rough rolling and the finish rolling steps, and the pressure is more than 210bar.
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| CN202211617806.6A CN116200677A (en) | 2022-12-15 | 2022-12-15 | High-strength hot-rolled coiled plate with tensile strength of 1100MPa for frame and manufacturing method thereof |
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| CN202211617806.6A CN116200677A (en) | 2022-12-15 | 2022-12-15 | High-strength hot-rolled coiled plate with tensile strength of 1100MPa for frame and manufacturing method thereof |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN112962026A (en) * | 2021-01-31 | 2021-06-15 | 邯郸钢铁集团有限责任公司 | Wide-width high-wear-resistance automobile compartment body steel and manufacturing method thereof |
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| CN104195443A (en) * | 2014-05-19 | 2014-12-10 | 首钢总公司 | High-flexural-behavior hot-formed steel used for automobiles and manufacturing method thereof |
| CN104513936A (en) * | 2014-12-19 | 2015-04-15 | 宝山钢铁股份有限公司 | Hardened and tempered high-strength steel with yield strength of 1100MPa and production method thereof |
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| CN112210725A (en) * | 2020-08-10 | 2021-01-12 | 唐山钢铁集团有限责任公司 | Steel strip for hot forming with tensile strength of 1900MPa and production method thereof |
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