CN106811689B - A kind of preparation method of tensile strength >=2000MPa hot forming steel - Google Patents
A kind of preparation method of tensile strength >=2000MPa hot forming steel Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 51
- 239000010959 steel Substances 0.000 title claims abstract description 51
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 238000005097 cold rolling Methods 0.000 claims abstract description 23
- 238000000137 annealing Methods 0.000 claims abstract description 21
- 238000010791 quenching Methods 0.000 claims abstract description 16
- 230000000171 quenching effect Effects 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 239000000126 substance Substances 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 102220008919 rs41282026 Human genes 0.000 claims abstract description 6
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 6
- 238000005098 hot rolling Methods 0.000 claims abstract description 3
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 6
- 238000005554 pickling Methods 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 5
- 238000010008 shearing Methods 0.000 abstract description 5
- 238000005520 cutting process Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 238000003723 Smelting Methods 0.000 abstract description 2
- 239000007769 metal material Substances 0.000 abstract 1
- 238000009740 moulding (composite fabrication) Methods 0.000 description 24
- 230000000052 comparative effect Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000004088 simulation Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 241001062472 Stokellia anisodon Species 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000037396 body weight Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing 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
- 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
- C22C38/02—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
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing 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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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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
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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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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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
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
A kind of preparation method of tensile strength >=2000MPa hot forming steel, belongs to metal material field.Chemical composition is by percentage to the quality：C 0.3%~0.5%, Si 1.2%~1.7%, Mn1.4%~2.0%, Al0.01%~0.07%, Cr≤1.5%, P≤0.008%, S≤0.005%, B 0.001%~0.01%, Ti 0.05%~0.1%, Nb0.01%~0.08%, remaining is Fe and inevitable impurity element；Hot forming steel is obtained using smelting, hot rolling, cold rolling, bell-type annealing, steel preparation flow of the present invention is simple, after austenitizing quenching, yield strength Rp0.2=1000MPa~1200MPa, tensile strength Rm >=2000MPa, elongation percentage A50=8%~9%；Using bell-type annealing technique, base-material intensity before hot forming is down to yield strength 424MPa~588MPa, tensile strength 616MPa~760MPa, elongation percentage A50 is improved to 17.3%~20.4%, greatly reduce carry out before hot forming shape cut and cutting process in uncoiling caused by because intensity is too high it is difficult, uncoiling broken belt, shear blanking embrittlement, edge stress is too high, damage shearing blade the problems such as, for realizing that the high-strength lightweight of automobile has very important meaning.
Description
Technical field
The invention belongs to automobile cold-rolled super-high strength steel technical field, more particularly to a kind of tensile strength >=2000MPa
Hot forming steel and preparation method thereof.
Background technology
The intensity of body of a motor car depends on the design and armor plate strength of vehicle body, therefore the steel plate at the important protection position of vehicle body is strong
Degree just seems most important, and thermoforming steel plate is undoubtedly the outstanding person in all kinds of high-strength plates.
Hot forming steel plate technology refer to by steel plate after high-temperature heating it is once-forming, and rapid cooling is so as to carrying comprehensively
Risen a kind of technology of armor plate strength, it is hot press-formed after steel plate, its yield strength up to 1000Mpa height, every square li
Rice can bear more than 10 tons of pressure, and this material with when on automobile, situation is not almost changed much in car body weight
Under, endurance improves 30%, so that the intensity of automobile reaches a brand-new level, at present, uses the vapour of hot forming steel
Car can reach five-star standard in Euro-NCAP crash tests.
Use of the hot forming steel on automobile body part, not only can because of its high intensity and be thinned part thickness from
And lightweight is realized, and when automobile hits, especially at front and side impact, can effectively reduce driving cabin change
Shape, the safety of driver and crew is protected, substantially increase the safety coefficient of automobile.
At present, conventional superhigh-strength hot forming steel is mostly 22MnB5 and 30MnB5 steel both at home and abroad, 22MnB5 drop stampings into
Yield strength >=1000MPa after shape, tensile strength >=1500MPa, elongation percentage is 5% or so；Bent after 30MnB5 is hot press-formed
Intensity >=1000MPa is taken, tensile strength >=1600MPa, elongation percentage is 5% or so；Therefore how plasticity be not greatly lowered
In the case of, improving the intensity of steel turns into one of urgent problem to be solved in hot forming techniques.
The present invention by the optimization of rational composition design and preparation technology parameter, obtained while improving intensity compared with
Good elongation percentage, comprehensive mechanical property is excellent, there is extraordinary realisation and economy.
The content of the invention
It is an object of the invention to provide a kind of tensile strength >=2000MPa hot forming steel and preparation method thereof, with biography
System hot forming steel is compared, and tensile strength >=2000MPa after steel austenitizing quenching of the present invention, plasticity is more preferable, elongation percentage A50=
8%~9%, the present invention not only can effectively reach automotive light weight technology purpose, and substantially increase safety coefficient, in addition, this
Invention uses bell-type annealing technique, and the base-material intensity before hot forming is down into yield strength 424MPa-588MPa, tensile strength
616MPa-760MPa, elongation percentage A50 are improved to 17.3%-20.4%, so as to greatly reduce progress shape cutting before hot forming
With in cutting process because intensity is too high caused by uncoiling it is difficult, uncoiling broken belt, shear blanking embrittlement, edge stress mistake
Height, damage shearing blade a series of problems, such as, have extraordinary realisation and economy.
A kind of preparation method of tensile strength >=2000MPa hot forming steel, it is characterised in that chemical composition is with quality hundred
Ratio is divided to be calculated as：C 0.3%~0.5%, Si 1.2%~1.7%, Mn 1.4%~2.0%, Al 0.01%~0.07%, Cr
≤ 1.5%, P≤0.008%, S≤0.005%, B 0.001%~0.01%, Ti 0.05%~0.1%, Nb 0.01%~
0.08%, remaining is Fe and inevitable impurity element.
Preparation process is as follows：
(1) strand for meeting mentioned component is smelted；
(2) strand enters heating furnace using hot-loading and hot-conveying mode, and furnace atmosphere is weak oxide atmosphere, and strand goes out heating furnace
Temperature is 1200 DEG C~1250 DEG C, and the soaking time after strand to temperature in stove is 0.5h-1h；
(3) strand after coming out of the stove passes through two passage roughing, then carries out finish rolling, 800 DEG C~900 DEG C of finish rolling finishing temperature,
Last percentage pass reduction is 20%~30%, and whole roller repairing batches, and coiling temperature is 600 DEG C~700 DEG C, obtains 5mm thickness
Hot-rolled strip；
(4) hot-rolled strip pickling and cold-rolling, cold rolling total reduction are 65%~85%, and the cold rolling reduction ratio of last a time controls
In 8%-15%, the thick cold rolling straps of 1.2mm are obtained；
(5) cold rolling strap carries out bell-type annealing, and the rate of heat addition is 0.5 DEG C/s, when being heated to 700 DEG C, is incubated 2-8h, Ran Houkong
It is cooled to room temperature, obtains hot forming steel band；
Hot forming steel band after annealing carries out austenitizing quenching, 850 DEG C~950 DEG C of austenitizing temperature, quenching cooling
Speed is more than 30 DEG C/s, and the mechanical property of steel band is after quenching：Rp0.2=1000MPa~1200MPa, Rm >=2000MPa, A50
=8%~9%.
Further, chemical composition contains Cr 0.6%~1.2% by percentage to the quality.
Further, chemical composition contains B 0.002~0.005% by percentage to the quality.
Further, chemical composition contains Nb0.03%~0.06% by percentage to the quality.
Further, the yield strength of hot forming steel is 424MPa~588MPa after bell-type annealing, and tensile strength is
616MPa~760MPa, elongation percentage A50=17.3%~20.4%.
Beneficial effects of the present invention
Compared with traditional 30MnB5 steel, the mechanical property of steel of the present invention is substantially dominant in intensity and ductility, the present invention
Steel preparation flow is simple, and the Composition And Process of reasonably optimizing, which designs, causes steel of the present invention to have excellent mechanical property, austenitizing
After quenching, yield strength Rp0.2=1000MPa~1200MPa, tensile strength Rm >=2000MPa, elongation percentage A50=8%~
9%；Also, the present invention use bell-type annealing technique, by the base-material intensity before hot forming be down to yield strength 424MPa~
588MPa, tensile strength 616MPa~760MPa, elongation percentage A50 are improved to 17.3%~20.4%, so as to greatly reduce heat
Carried out before shaping shape cut and cutting process in uncoiling caused by because intensity is too high it is difficult, uncoiling broken belt, shearing falls
Expect embrittlement, edge stress is too high, damage shearing blade a series of problems, such as, have extraordinary realisation and economy.
Brief description of the drawings
Fig. 1：Microstructure picture after the quenching of the embodiment of the present invention 1；
Fig. 2：Microstructure picture after the quenching of comparative example 1 of the present invention.
Embodiment
Embodiment 1
The chemical composition of embodiment 1 is 0.38%C, 1.48%Si, 1.58%Mn, 0.035%Al by percentage to the quality,
0.91%Cr, 0.005%P, 0.004%S, 0.0037%B, 0.07%Ti, 0.048%Nb, remaining is for Fe and inevitably
Impurity element.
Preparation process is：Smelt the strand for meeting component requirements；For strand hot-loading and hot-conveying to heating furnace, furnace atmosphere is weak oxygen
Change atmosphere, strand goes out furnace temp for 1220 DEG C, and the soaking time arrived in stove after temperature is 40min；After coming out of the stove, strand is carried out
Two passage roughing, multi-pass finish rolling, 850 DEG C of finish rolling finishing temperature, last percentage pass reduction are 25%, whole roller repairing volume
Take, coiling temperature is 650 DEG C, obtains 5mm thickness hot-rolled strips；Hot-rolled strip pickling and cold-rolling, cold rolling total reduction 72%, last a time
The control of cold rolling reduction ratio 12%, obtain the thick cold rolling straps of 1.2mm；Cold rolling strap progress bell-type annealing, 700 DEG C of annealing temperature,
Time 2h, is then air-cooled to room temperature, obtains hot forming steel band, detects the mechanical property of steel band, the specific performance index such as institute of table 1
Show；Hot forming steel band after annealing carries out austenitizing quenching, 930 DEG C of austenitizing temperature, quenches, 50 DEG C/s of cooldown rate,
The mechanical property of steel band is detected after quenching and carries out microstructure observation, obtained mechanical property is as shown in table 1, and microscopic structure is such as
Shown in Fig. 1.
Embodiment 2
The chemical composition of embodiment 2 is 0.42%C, 1.57%Si, 1.72%Mn, 0.037%Al by percentage to the quality,
1.06%Cr, 0.008%P, 0.002%S, 0.0041%B, 0.031%Ti, 0.036%Nb, remaining is for Fe and inevitably
Impurity element.
Preparation process is：Smelt the strand for meeting component requirements；For strand hot-loading and hot-conveying to heating furnace, furnace atmosphere is weak oxygen
Change atmosphere, strand goes out furnace temp for 1220 DEG C, and the soaking time arrived in stove after temperature is 50min；After coming out of the stove, strand is carried out
Two passage roughing, multi-pass finish rolling, 870 DEG C of finish rolling finishing temperature, last percentage pass reduction are 21%, whole roller repairing volume
Take, coiling temperature is 660 DEG C, obtains 5mm thickness hot-rolled strips；Hot-rolled strip pickling and cold-rolling, cold rolling total reduction 72%, last a time
The control of cold rolling reduction ratio 14%, obtain the thick cold rolling straps of 1.2mm；Cold rolling strap progress bell-type annealing, 700 DEG C of annealing temperature,
Time 5h, is then air-cooled to room temperature, obtains hot forming steel band, detects the mechanical property of steel band, the specific performance index such as institute of table 1
Show；Hot forming steel band after annealing carries out austenitizing quenching, 890 DEG C of austenitizing temperature, quenches, cooling velocity, 40 DEG C/s,
The mechanical property of steel band is detected after quenching and carries out microstructure observation, obtained mechanical property is as shown in table 1.
Embodiment 3
The chemical composition of embodiment 3 is 0.33%C, 1.39%Si, 1.84%Mn, 0.061%Al by percentage to the quality,
1.33%Cr, 0.005%P, 0.003%S, 0.0032%B, 0.049%Ti, 0.051%Nb, remaining is for Fe and inevitably
Impurity element, preparation process is substantially the same manner as Example 1, only difference is that the time of bell-type annealing is 8h, bell-type moves back
The mechanical property of steel is as shown in table 1 after the mechanical property of steel plate, austenitizing quenching after fire.
Comparative example 1
Choose University of Science ＆ Technology, Beijing's journal in October, 2014 phase open source literature of volume 36 10《30SiMnCrB5 hot forming steel
Microstructure and mechanical property》The 30SiMnCrB5 hot formings steel of middle report is as a comparison case.The steel chemical composition is with quality hundred
Ratio is divided to be calculated as：0.3%C, 1.5%Si, 1.0%Mn, 1.0%Cr, 0.002%B, remaining is Fe and inevitable impurity.
After strand forging after smelting, 5 passes are carried out after 1200 DEG C are incubated 1h, obtain the hot rolling that thickness is 6mm
Plate, it is 870 DEG C to control finishing temperature, and water cooling cools to room temperature with the furnace to being incubated in holding furnace after 660 DEG C after 1h simulations are batched；
Then pass through pickling and cold-rolling, cold rolling reduction ratio 75%, obtain 1.5mm thickness cold-reduced sheets；Then tied again in box Muffle furnace
Crystalline substance annealing, 760 DEG C of annealing temperature；Then austenitizing quenching simulation, heating-up temperature 950 are carried out on Simulated Tests For The Heat Treatment machine
DEG C, 10min is incubated, then simulation cooling；Mechanics properties testing and microstructure observation are then carried out, the mechanical property measured is such as
Shown in table 1, microscopic structure is as shown in Figure 2.
The mechanical property of the embodiment of table 1 and comparative example
It was found from the mechanical property of the embodiment of table 1 and comparative example：Embodiment 1, embodiment 2, the yield strength of embodiment 3 are omited
Higher than comparative example 1, tensile strength is higher 200-300MPa than comparative example, and elongation percentage is lower slightly, and overall performance is seen, while realizing high-strength
There is preferably elongation percentage value；The intensity of all embodiments is decreased obviously after bell-type annealing, correspondingly, on elongation percentage is obvious
Rise, and as downward trend is presented in the extension intensity of bell-type annealing time, and elongation percentage is optimal to be incubated 5h performances, it is overall suitable
For the uncoiling shearing requirement before hot forming.
It should be noted last that above-described embodiment, to the purpose of the present invention, technical scheme and beneficial
Effect is further described, and should be understood that the embodiment that the foregoing is only the present invention, and
It is non-to be used to limit the present invention, all any modifications within the spirit and principle of technical solution of the present invention, made, equivalent substitution,
Improve etc., it should be included within the claims of the present invention.
Claims (5)
1. a kind of preparation method of tensile strength >=2000MPa hot forming steel, it is characterised in that chemical composition is with quality percentage
Than being calculated as：C 0.3%~0.5%, Si 1.2%~1.7%, Mn 1.4%~2.0%, Al 0.01%~0.07%, Cr≤
1.5%, P≤0.008%, S≤0.005%, B 0.001%~0.01%, Ti 0.05%~0.1%, Nb 0.01%~
0.08%, remaining is Fe and inevitable impurity element；
Preparation process is as follows：
(1) strand for meeting mentioned component is smelted；
(2) strand enters heating furnace using hot-loading and hot-conveying mode, and furnace atmosphere is weak oxide atmosphere, and strand goes out the temperature of heating furnace
For 1200 DEG C~1250 DEG C, the soaking time after strand to temperature in stove is 0.5h-1h；
(3) strand after coming out of the stove passes through two passage roughing, then carries out finish rolling, 800 DEG C~900 DEG C of finish rolling finishing temperature, finally
A time reduction ratio is 20%~30%, and whole roller repairing batches, and coiling temperature is 600 DEG C~700 DEG C, obtains 5mm thickness hot rollings
Band；
(4) hot-rolled strip pickling and cold-rolling, cold rolling total reduction are 65%~85%, and the cold rolling reduction ratio control of last a time exists
8%-15%, obtain the thick cold rolling straps of 1.2mm；
(5) cold rolling strap carries out bell-type annealing, and the rate of heat addition is 0.5 DEG C/s, when being heated to 700 DEG C, is incubated 2-8h, is then air-cooled to
Room temperature, obtain hot forming steel band；
Hot forming steel band after annealing carries out austenitizing quenching, 850 DEG C~950 DEG C of austenitizing temperature, quenches cooling velocity
More than 30 DEG C/s, the mechanical property of steel band is after quenching：Rp0.2=1000MPa~1200MPa, Rm >=2000MPa, A50=
8%~9%.
A kind of 2. preparation method of tensile strength >=2000MPa hot forming steel as claimed in claim 1, it is characterised in that
Cr contents are 0.6%~1.2%.
3. a kind of tensile strength >=2000MPa as claimed in claim 1 hot forming steel Preparation Method, it is characterised in that B contains
Measure as 0.002~0.005%.
A kind of 4. preparation method of tensile strength >=2000MPa hot forming steel as claimed in claim 1, it is characterised in that
Nb contents are 0.03%~0.06%.
A kind of 5. preparation method of tensile strength >=2000MPa hot forming steel as claimed in claim 1, it is characterised in that
The yield strength of hot forming steel is 424MPa~588MPa after bell-type annealing, and tensile strength is 616MPa~760MPa, elongation percentage
A50=17.3%~20.4%.
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| US20220119929A1 (en) * | 2019-03-20 | 2022-04-21 | Nippon Steel Corporation | Hot-stamping formed body |
| CN109881080B (en) * | 2019-03-20 | 2021-07-20 | 包头钢铁（集团）有限责任公司 | Medium-carbon spring hot-rolled coil and manufacturing method thereof |
| CN110079743B (en) * | 2019-05-21 | 2020-12-11 | 武汉钢铁有限公司 | 1500 MPa-grade low-hydrogen delayed cracking sensitive hot forming steel and production method thereof |
| CN111500944A (en) * | 2020-06-09 | 2020-08-07 | 首钢集团有限公司 | High-yield-strength low-hydrogen-brittleness-sensitivity hot forming steel and preparation method thereof |
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| JP5181517B2 (en) * | 2007-04-13 | 2013-04-10 | Ｊｆｅスチール株式会社 | Steel sheet for hot pressing |
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| CN102965591A (en) * | 2012-12-07 | 2013-03-13 | 上海宝钢型钢有限公司 | High-strength steel rolling hot-forming technology |
| CN103469090A (en) * | 2013-09-17 | 2013-12-25 | 北京科技大学 | Annealing method of ultrahigh-strength hot-forming steel |
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