CN109735775A - A kind of 1000MPa grades of superhigh-strength hot strip rolling and its production method - Google Patents
A kind of 1000MPa grades of superhigh-strength hot strip rolling and its production method Download PDFInfo
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Abstract
The invention discloses a kind of 1000MPa grades of superhigh-strength hot strip rolling and its production methods, hot rolled strip chemical component composition and mass percentage are as follows: C:0.08~0.15%, Mn:2.30~2.83%, Si≤0.80%, Als:0.025~0.052%, S≤0.020%, P≤0.030%, Cr:0.50~0.70%, Ti:0.01~0.05%, Mo:0.15~0.30%, surplus are Fe and inevitable impurity；Production method includes converter smelting, the refining of LF furnace, sheet billet continuous casting, heating, roughing, finish rolling, cooling and coiling process.The present invention plays the role of refined crystalline strengthening by the way that micro Mo, Ti alloy is added；Hot-rolled temperature and cooling rate are rationally designed, gained hot rolled strip is suitable for automobile structural steel, while improving bus body strength, mitigates complete vehicle weight, reduces Fuel consumption.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of 1000MPa grades of superhigh-strength hot strip rolling and its producer
Method.
Background technique
High-strength hot-rolled steel band has wide range of applications, in automobile industry, machine industry, mineral industry, building trade
In applied.Especially automobile industry, in use due to automobile structural steel, in addition to bearing automobile own wt
Outside, the influence of many factors such as impact, distortion, the inertia force in vehicle traveling process is still suffered from, such as vehicle bottom cross member,
Seat slide, crash bar, reinforcing beam, collision prevention girders, chassis suspender etc..With the raising of automotive light weight technology and security requirement,
Requirement to vehicle body " improve intensity, mitigate weight " is also higher and higher, and thin gauge high-strength vehicle has become large size with steel at present
Steel mill falls over each other the object of exploitation.
From the point of view of previous experience, hot rolled strip intensity is more than the loss for inherently bringing toughness of 1000MPa, modern times enterprise
For industry generally by the way of press quenching, that is, the mode for rolling rear ultrafast cold+low temperature curling obtains martensitic structure to realize intensity
Promotion.
Due to the limitation of 1580 producing line abilities, to reach the promotion of intensity and the optimization of cost, by chemical component
The effective control and innovative design of cooling system etc. of optimization design, rolling temperature, using alloy Mn ingredient, Cr ingredient and Mo at
Point rational proportion, austenite Unhydrated cement have abundant cumulative deformation finishing temperature design, exit temperature at finishing and
Threading speed matches, coiling temperature and threading speed match, control cooling two sections of cooling means using air-cooled+water cooling,
Guarantee that phase transformation is abundant, is precipitated sufficiently, realizes the combination of refined crystalline strengthening, precipitation strength, largely compensate for 1580
The deficiency of the capacities of equipment such as line level cold strength deficiency, coiling machine scarce capacity, realizes the strength hot rolled steel band of 1000MPa
Industrialized production.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of 1000MPa grades of superhigh-strength hot strip rolling and its production methods.
In order to solve the above technical problems, the technical solution used in the present invention is: a kind of 1000MPa grades of superhigh-strength hot steel rolling
Band, the hot rolled strip chemical component composition and its mass percentage are as follows: C:0.08~0.15%, Mn:2.30~2.83%, Si
≤ 0.80%, Als:0.025~0.052%, S≤0.020%, P≤0.030%, Cr:0.50~0.70%, Ti:0.01~0.05%,
Mo:0.15~0.30%, surplus are Fe and inevitable impurity.
Hot rolled strip of the present invention is with a thickness of 2.0~4.0mm；Hot rolled strip metallographic structure is ferrite+bainite+horse
Family name's body tissue.
Hot rolled strip performance of the present invention: yield strength Rp0.2>=700MPa, tensile strength Rm >=1000MPa, has no progeny
Elongation A80≥8%。
The present invention also provides a kind of production method of 1000MPa grades of superhigh-strength hot strip rolling, the production method includes
Converter smelting, the refining of LF furnace, sheet billet continuous casting, heating, roughing, finish rolling, cooling and coiling process；The finishing rolling step, by 7
The steel band that secondary finish rolling rolls into a thickness of 2.0~4.0mm, 1040~1080 DEG C of entry temperature at finishing, 850~910 DEG C of finishing temperature；
The cooling process, air-cooled using 3.0~5.0s of leading portion, it is 800~840 DEG C that water cooling, which opens cold temperature, and cooling rate is 20~30
℃/s。
Converter smelting and LF furnace refining procedure of the present invention, control ladle chemistry composition and its mass percentage
Are as follows: C:0.08~0.15%, Mn:2.30~2.83%, Si≤0.80%, Als:0.025~0.052%, S≤0.020%, P≤
0.030%, Cr:0.50~0.70%, Ti:0.01~0.05%, Mo:0.15~0.30%, surplus are Fe and inevitable impurity.
Sheet billet continuous casting process of the present invention, continuous casting obtain the steel billet of 180~230mm of thickness.
Heating process of the present invention, through stepped heating stove heating, heating steel billet soaking section temperature >=1260 DEG C, soaking
30~35min of time, total 170~230min of heating time.
Roughing operation of the present invention, the reciprocating 5 passage roughing of single chassis, single pass high-pressure water descaling, de-scaling water pressure
For 20~25MPa, 32~38mm of sotck thinkness among gained reaches that reduce head and tail temperature poor after Coil Box is batched and overturned end to end
Purpose.
Coiling process of the present invention, coiling temperature are 590~640 DEG C, and superhigh-strength hot strip rolling is obtained after batching.
1000MPa grades of superhigh-strength hot strip rolling product standard of the present invention refers to PREN10338-2010；Properties of product detection
Method standard refers to GB/T228-2002.
The beneficial effects of adopting the technical scheme are that 1, Design of Chemical Composition of the present invention is reasonable, it is stringent to control
S, P, Cr constituent content processed plays the role of refined crystalline strengthening by the way that micro Mo, Ti alloy is added.2, rolling process of the present invention closes
Reason design hot-rolling temperature system and cooling rate, meet the performance requirement of the strong automobile structural steel of superelevation.3, superhigh-strength hot of the present invention
The metallographic structure of strip rolling is configured to ferrite, bainite and martensite tissue, yield strength Rp0.2>=700MPa, tensile strength
Rm >=1000MPa, elongation after fracture A80>=8%, it is suitable for automobile structural steel, while improving bus body strength, can reduce makes
With steel plate thickness, mitigate complete vehicle weight, reduces Fuel consumption.
Detailed description of the invention
Fig. 1 is 1 superhigh-strength hot strip rolling metallographic structure figure of embodiment；
Fig. 2 is 2 superhigh-strength hot strip rolling metallographic structure figure of embodiment；
Fig. 3 is 3 superhigh-strength hot strip rolling metallographic structure figure of embodiment；
Fig. 4 is 4 superhigh-strength hot strip rolling metallographic structure figure of embodiment；
Fig. 5 is 5 superhigh-strength hot strip rolling metallographic structure figure of embodiment；
Fig. 6 is 6 superhigh-strength hot strip rolling metallographic structure figure of embodiment；
Fig. 7 is 7 superhigh-strength hot strip rolling metallographic structure figure of embodiment；
Fig. 8 is 8 superhigh-strength hot strip rolling metallographic structure figure of embodiment；
Fig. 9 is 9 superhigh-strength hot strip rolling metallographic structure figure of embodiment；
Figure 10 is 10 superhigh-strength hot strip rolling metallographic structure figure of embodiment.
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments
Embodiment 1
1000MPa grades of superhigh-strength hot strip rollings of the present embodiment are shown in a thickness of 3.0mm, chemical component composition and mass percentage
Table 1.
The production method of 1000MPa grades of superhigh-strength hot strip rollings of the present embodiment includes converter smelting, the refining of LF furnace, slab company
Casting, heating, roughing, finish rolling, cooling and coiling process, specific process step are as described below:
(1) converter smelting and LF furnace refining procedure: the chemical component composition and its mass percentage for controlling molten steel are shown in Table 1；
(2) sheet billet continuous casting process: continuous casting obtains the steel billet of thickness 200mm；
(3) heating process: through stepped heating stove heating, 1280 DEG C of heating steel billet soaking section temperature, soaking time 30min, always
Heating time 190min；
(4) roughing operation: the reciprocating 5 passage roughing of single chassis, single pass high-pressure water descaling, de-scaling water pressure are 21MPa, gained
Intermediate sotck thinkness 32mm, batches through Coil Box and overturns end to end；
(5) finishing rolling step: rolling into the steel band with a thickness of 3.0mm by 7 passage finish rolling, and 1060 DEG C of entry temperature at finishing, finish to gauge temperature
900 DEG C of degree；
(6) cooling process:, air cooling time 3.5s air-cooled using leading portion, it is 830 DEG C that water cooling, which opens cold temperature, cooling rate 23
℃/s；
(7) coiling process, coiling temperature are 620 DEG C, and superhigh-strength hot strip rolling is obtained after batching.
The mechanical property of 1000MPa grades of superhigh-strength hot strip rollings of the present embodiment is shown in Table 2；Hot rolled strip metallographic structure is iron element
Body+bainite+martensitic structure, metallographic structure figure are shown in Fig. 1.
Embodiment 2
1000MPa grades of superhigh-strength hot strip rollings of the present embodiment are shown in a thickness of 3.5mm, chemical component composition and mass percentage
Table 1.
The production method of 1000MPa grades of superhigh-strength hot strip rollings of the present embodiment includes converter smelting, the refining of LF furnace, slab company
Casting, heating, roughing, finish rolling, cooling and coiling process, specific process step are as described below:
(1) converter smelting and LF furnace refining procedure: the chemical component composition and its mass percentage for controlling molten steel are shown in Table 1；
(2) sheet billet continuous casting process: continuous casting obtains the steel billet of thickness 230mm；
(3) heating process: through stepped heating stove heating, 1270 DEG C of heating steel billet soaking section temperature, soaking time 35min, always
Heating time 180min；
(4) roughing operation: the reciprocating 5 passage roughing of single chassis, single pass high-pressure water descaling, de-scaling water pressure are 23MPa, gained
Intermediate sotck thinkness 35mm, batches through Coil Box and overturns end to end；
(5) finishing rolling step: rolling into the steel band with a thickness of 3.5mm by 7 passage finish rolling, and 1065 DEG C of entry temperature at finishing, finish to gauge temperature
850 DEG C of degree；
(6) cooling process, air cooling time 3s air-cooled using leading portion, water cooling open cold temperature be 810 DEG C, cooling rate be 27 DEG C/
s；
(7) coiling process: coiling temperature is 620 DEG C, and superhigh-strength hot strip rolling is obtained after batching.
The mechanical property of 1000MPa grades of superhigh-strength hot strip rollings of the present embodiment is shown in Table 2；Hot rolled strip metallographic structure is iron element
Body+bainite+martensitic structure, metallographic structure figure are shown in Fig. 2.
Embodiment 3
1000MPa grades of superhigh-strength hot strip rollings of the present embodiment are shown in a thickness of 4.0mm, chemical component composition and mass percentage
Table 1.
The production method of 1000MPa grades of superhigh-strength hot strip rollings of the present embodiment includes converter smelting, the refining of LF furnace, slab company
Casting, heating, roughing, finish rolling, cooling and coiling process, specific process step are as described below:
(1) converter smelting and LF furnace refining procedure: the chemical component composition and mass percentage for controlling molten steel are shown in Table 1；
(2) sheet billet continuous casting process: continuous casting obtains the steel billet of thickness 230mm；
(3) heating process: through stepped heating stove heating, 1290 DEG C of heating steel billet soaking section temperature, soaking time 35min, always
Heating time 190min；
(4) roughing operation: the reciprocating 5 passage roughing of single chassis, single pass high-pressure water descaling, de-scaling water pressure are 24MPa, gained
Intermediate sotck thinkness 37mm, batches through Coil Box and overturns end to end；
(5) finishing rolling step: rolling into the steel band with a thickness of 4.0mm by 7 passage finish rolling, and 1060 DEG C of entry temperature at finishing, finish to gauge temperature
880 DEG C of degree；
(6) cooling process, air cooling time 3.5s air-cooled using leading portion, it is 820 DEG C that water cooling, which opens cold temperature, cooling rate 26
℃/s；
(7) coiling process: coiling temperature is 590 DEG C, and superhigh-strength hot strip rolling is obtained after batching.
The mechanical property of 1000MPa grades of superhigh-strength hot strip rollings of the present embodiment is shown in Table 2；Hot rolled strip metallographic structure is iron element
Body+bainite+martensitic structure, metallographic structure figure are shown in Fig. 3.
Embodiment 4
1000MPa grades of superhigh-strength hot strip rollings of the present embodiment are shown in a thickness of 2.5mm, chemical component composition and mass percentage
Table 1.
The production method of 1000MPa grades of superhigh-strength hot strip rollings of the present embodiment includes converter smelting, the refining of LF furnace, slab company
Casting, heating, roughing, finish rolling, cooling and coiling process, specific process step are as described below:
(1) converter smelting and LF furnace refining procedure: the chemical component composition and its mass percentage for controlling molten steel are shown in Table 1；
(2) sheet billet continuous casting process: continuous casting obtains the steel billet of thickness 180mm；
(3) heating process: through stepped heating stove heating, 1280 DEG C of heating steel billet soaking section temperature, soaking time 30min, always
Heating time 170min；
(4) roughing operation: the reciprocating 5 passage roughing of single chassis, single pass high-pressure water descaling, de-scaling water pressure are 24MPa, gained
Intermediate sotck thinkness 33mm, batches through Coil Box and overturns end to end；
(5) finishing rolling step: rolling into the steel band with a thickness of 2.5mm by 7 passage finish rolling, and 1040 DEG C of entry temperature at finishing, finish to gauge temperature
880 DEG C of degree；
(6) cooling process:, air cooling time 5.0s air-cooled using leading portion, it is 810 DEG C that water cooling, which opens cold temperature, cooling rate 20
℃/s；
(7) coiling process: coiling temperature is 600 DEG C, and superhigh-strength hot strip rolling is obtained after batching.
The mechanical property of 1000MPa grades of superhigh-strength hot strip rollings of the present embodiment is shown in Table 2；Hot rolled strip metallographic structure is iron element
Body+bainite+martensitic structure, metallographic structure figure are shown in Fig. 4.
Embodiment 5
1000MPa grades of superhigh-strength hot strip rollings of the present embodiment are shown in a thickness of 4.0mm, chemical component composition and mass percentage
Table 1.
The production method of 1000MPa grades of superhigh-strength hot strip rollings of the present embodiment includes converter smelting, the refining of LF furnace, slab company
Casting, heating, roughing, finish rolling, cooling and coiling process, specific process step are as described below:
(1) converter smelting and LF furnace refining procedure: the chemical component composition and its mass percentage for controlling molten steel are shown in Table 1；
(2) sheet billet continuous casting process: continuous casting obtains the steel billet of thickness 200mm；
(3) heating process: through stepped heating stove heating, 1280 DEG C of heating steel billet soaking section temperature, soaking time 35min, always
Heating time 180min；
(4) roughing operation: the reciprocating 5 passage roughing of single chassis, single pass high-pressure water descaling, de-scaling water pressure are 22MPa, gained
Intermediate sotck thinkness 35mm, batches through Coil Box and overturns end to end；
(5) finishing rolling step: rolling into the steel band with a thickness of 4.0mm by 7 passage finish rolling, and 1075 DEG C of entry temperature at finishing, finish to gauge temperature
860 DEG C of degree；
(6) cooling process: using leading portion it is air-cooled, air cooling time 3s, water cooling open cold temperature be 820 DEG C, cooling rate be 25 DEG C/
s；
(7) coiling process, coiling temperature are 610 DEG C, and superhigh-strength hot strip rolling is obtained after batching.
The mechanical property of 1000MPa grades of superhigh-strength hot strip rollings of the present embodiment is shown in Table 2；Hot rolled strip metallographic structure is iron element
Body+bainite+martensitic structure, metallographic structure figure are shown in Fig. 5.
Embodiment 6
1000MPa grades of superhigh-strength hot strip rollings of the present embodiment are shown in a thickness of 3.0mm, chemical component composition and mass percentage
Table 1.
The production method of 1000MPa grades of superhigh-strength hot strip rollings of the present embodiment includes converter smelting, the refining of LF furnace, slab company
Casting, heating, roughing, finish rolling, cooling and coiling process, specific process step are as described below:
(1) converter smelting and LF furnace refining procedure: the chemical component composition and its mass percentage for controlling molten steel are shown in Table 1；
(2) sheet billet continuous casting process: continuous casting obtains the steel billet of thickness 200mm；
(3) heating process: through stepped heating stove heating, 1290 DEG C of heating steel billet soaking section temperature, soaking time 33min, always
Heating time 180min；
(4) roughing operation: the reciprocating 5 passage roughing of single chassis, single pass high-pressure water descaling, de-scaling water pressure are 24MPa, gained
Intermediate sotck thinkness 32mm, batches through Coil Box and overturns end to end；
(5) finishing rolling step: rolling into the steel band with a thickness of 3.0mm by 7 passage finish rolling, and 1060 DEG C of entry temperature at finishing, finish to gauge temperature
890 DEG C of degree；
(6) cooling process:, air cooling time 3.5s air-cooled using leading portion, it is 830 DEG C that water cooling, which opens cold temperature, cooling rate 26
℃/s；
(7) coiling process: coiling temperature is 620 DEG C, and superhigh-strength hot strip rolling is obtained after batching.
The mechanical property of 1000MPa grades of superhigh-strength hot strip rollings of the present embodiment is shown in Table 2；Hot rolled strip metallographic structure is iron element
Body+bainite+martensitic structure, metallographic structure figure are shown in Fig. 6.
Embodiment 7
1000MPa grades of superhigh-strength hot strip rollings of the present embodiment are shown in a thickness of 2.2mm, chemical component composition and mass percentage
Table 1.
The production method of 1000MPa grades of superhigh-strength hot strip rollings of the present embodiment includes converter smelting, the refining of LF furnace, slab company
Casting, heating, roughing, finish rolling, cooling and coiling process, specific process step are as described below:
(1) converter smelting and LF furnace refining procedure: the chemical component composition and its mass percentage for controlling molten steel are shown in Table 1；
(2) sheet billet continuous casting process: continuous casting obtains the steel billet of thickness 180mm；
(3) heating process: through stepped heating stove heating, 1260 DEG C of heating steel billet soaking section temperature, soaking time 32min, always
Heating time 230min；
(4) roughing operation: the reciprocating 5 passage roughing of single chassis, single pass high-pressure water descaling, de-scaling water pressure are 25MPa, gained
Intermediate sotck thinkness 38mm, batches through Coil Box and overturns end to end；
(5) finishing rolling step: rolling into the steel band with a thickness of 2.2mm by 7 passage finish rolling, and 1080 DEG C of entry temperature at finishing, finish to gauge temperature
900 DEG C of degree；
(6) cooling process:, air cooling time 3.5s air-cooled using leading portion, it is 840 DEG C that water cooling, which opens cold temperature, cooling rate 20
℃/s；
(7) coiling process: coiling temperature is 640 DEG C, and superhigh-strength hot strip rolling is obtained after batching.
The mechanical property of 1000MPa grades of superhigh-strength hot strip rollings of the present embodiment is shown in Table 2；Hot rolled strip metallographic structure is iron element
Body+bainite+martensitic structure, metallographic structure figure are shown in Fig. 7.
Embodiment 8
1000MPa grades of superhigh-strength hot strip rollings of the present embodiment are shown in a thickness of 3.4mm, chemical component composition and mass percentage
Table 1.
The production method of 1000MPa grades of superhigh-strength hot strip rollings of the present embodiment includes converter smelting, the refining of LF furnace, slab company
Casting, heating, roughing, finish rolling, cooling and coiling process, specific process step are as described below:
(1) converter smelting and LF furnace refining procedure: the chemical component composition and its mass percentage for controlling molten steel are shown in Table 1；
(2) sheet billet continuous casting process: continuous casting obtains the steel billet of thickness 200mm；
(3) heating process: through stepped heating stove heating, 1265 DEG C of heating steel billet soaking section temperature, soaking time 35min, always
Heating time 190min；
(4) roughing operation: the reciprocating 5 passage roughing of single chassis, single pass high-pressure water descaling, de-scaling water pressure are 22MPa, gained
Intermediate sotck thinkness 34mm, batches through Coil Box and overturns end to end；
(5) finishing rolling step: rolling into the steel band with a thickness of 3.4mm by 7 passage finish rolling, and 1050 DEG C of entry temperature at finishing, finish to gauge temperature
910 DEG C of degree；
(6) cooling process:, air cooling time 4.0s air-cooled using leading portion, it is 840 DEG C that water cooling, which opens cold temperature, cooling rate 30
℃/s；
(7) coiling process: coiling temperature is 620 DEG C, and superhigh-strength hot strip rolling is obtained after batching.
The mechanical property of 1000MPa grades of superhigh-strength hot strip rollings of the present embodiment is shown in Table 2；Hot rolled strip metallographic structure is iron element
Body+bainite+martensitic structure, metallographic structure figure are shown in Fig. 8.
Embodiment 9
1000MPa grades of superhigh-strength hot strip rollings of the present embodiment are shown in a thickness of 2.0mm, chemical component composition and mass percentage
Table 1.
The production method of 1000MPa grades of superhigh-strength hot strip rollings of the present embodiment includes converter smelting, the refining of LF furnace, slab company
Casting, heating, roughing, finish rolling, cooling and coiling process, specific process step are as described below:
(1) converter smelting and LF furnace refining procedure: the chemical component composition and its mass percentage for controlling molten steel are shown in Table 1；
(2) sheet billet continuous casting process: continuous casting obtains the steel billet of thickness 190mm；
(3) heating process: through stepped heating stove heating, 1275 DEG C of heating steel billet soaking section temperature, soaking time 32min, always
Heating time 210min；
(4) roughing operation: the reciprocating 5 passage roughing of single chassis, single pass high-pressure water descaling, de-scaling water pressure are 20MPa, gained
Intermediate sotck thinkness 35mm, batches through Coil Box and overturns end to end；
(5) finishing rolling step: rolling into the steel band with a thickness of 2.0mm by 7 passage finish rolling, and 1055 DEG C of entry temperature at finishing, finish to gauge temperature
870 DEG C of degree；
(6) cooling process:, air cooling time 4.5s air-cooled using leading portion, it is 800 DEG C that water cooling, which opens cold temperature, cooling rate 22
℃/s；
(7) coiling process: coiling temperature is 610 DEG C, and superhigh-strength hot strip rolling is obtained after batching.
The mechanical property of 1000MPa grades of superhigh-strength hot strip rollings of the present embodiment is shown in Table 2；Hot rolled strip metallographic structure is iron element
Body+bainite+martensitic structure, metallographic structure figure are shown in Fig. 9.
Embodiment 10
1000MPa grades of superhigh-strength hot strip rollings of the present embodiment are shown in a thickness of 3.8mm, chemical component composition and mass percentage
Table 1.
The production method of 1000MPa grades of superhigh-strength hot strip rollings of the present embodiment includes converter smelting, the refining of LF furnace, slab company
Casting, heating, roughing, finish rolling, cooling and coiling process, specific process step are as described below:
(1) converter smelting and LF furnace refining procedure: the chemical component composition and its mass percentage for controlling molten steel are shown in Table 1；
(2) sheet billet continuous casting process: continuous casting obtains the steel billet of thickness 210mm；
(3) heating process: through stepped heating stove heating, 1285 DEG C of heating steel billet soaking section temperature, soaking time 33min, always
Heating time 220min；
(4) finishing rolling step: rolling into the steel band with a thickness of 3.8mm by 7 passage finish rolling, and 1070 DEG C of entry temperature at finishing, finish to gauge temperature
880 DEG C of degree；
(5) roughing operation: the reciprocating 5 passage roughing of single chassis, single pass high-pressure water descaling, de-scaling water pressure are 20:MPa, institute
Intermediate sotck thinkness 33mm is obtained, batches through Coil Box and overturns end to end；
(6) cooling process:, air cooling time 5.0s air-cooled using leading portion, it is 830 DEG C that water cooling, which opens cold temperature, cooling rate 27
℃/s；
(7) coiling process: coiling temperature is 630 DEG C, and superhigh-strength hot strip rolling is obtained after batching.
The mechanical property of 1000MPa grades of superhigh-strength hot strip rollings of the present embodiment is shown in Table 2；Hot rolled strip metallographic structure is iron element
Body+bainite+martensitic structure, metallographic structure figure are shown in Figure 10.
The chemical component of the 1000MPa grade superhigh-strength hot strip rolling of 1 embodiment 1-10 of table forms
And its mass percentage (%)
The mechanical property of the 1000MPa grade superhigh-strength hot strip rolling of 2 embodiment 1-8 of table
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to the present invention into
Go detailed description, those skilled in the art should understand that: it can still modify to the present invention or equally replace
It changes, without departing from the spirit or scope of the invention, or any substitutions, should all cover and be wanted in right of the invention
It asks in range.
Claims (9)
1. a kind of 1000MPa grades of superhigh-strength hot strip rolling, which is characterized in that the hot rolled strip chemical component composition and its quality
Percentage composition are as follows: C:0.08~0.15%, Mn:2.30~2.83%, Si≤0.80%, Als:0.025~0.052%, S≤
0.020%, P≤0.030%, Cr:0.50~0.70%, Ti:0.01~0.05%, Mo:0.15~0.30%, surplus are Fe and can not
The impurity avoided.
2. a kind of 1000MPa grades of superhigh-strength hot strip rollings according to claim 1, which is characterized in that the hot rolled strip
With a thickness of 2.0~4.0mm；Hot rolled strip metallographic structure is ferrite+bainite+martensitic structure.
3. a kind of 1000MPa grades of superhigh-strength hot strip rollings according to claim 1, which is characterized in that the hot rolled strip
Performance: yield strength Rp0.2>=700MPa, tensile strength Rm >=1000MPa, elongation after fracture A80≥8%。
4. special based on a kind of production method of 1000MPa grades of superhigh-strength hot strip rolling described in claim 1-3 any one
Sign is that the production method includes converter smelting, the refining of LF furnace, sheet billet continuous casting, heating, roughing, finish rolling, cooling and fourth hand
Sequence；The finishing rolling step rolls into the steel band with a thickness of 2.0~4.0mm by 7 passage finish rolling, and entry temperature at finishing 1040~
1080 DEG C, 850~910 DEG C of finishing temperature；The cooling process, air-cooled using 3.0~5.0s of leading portion, water cooling opens cold temperature and is
800~840 DEG C, cooling rate is 20~30 DEG C/s.
5. a kind of production method of 1000MPa grades of superhigh-strength hot strip rollings according to claim 4, which is characterized in that institute
State converter smelting and LF furnace refining procedure, control ladle chemistry composition and its mass percentage are as follows: C:0.08~
0.15%, Mn:2.30~2.83%, Si≤0.80%, Als:0.025~0.052%, S≤0.020%, P≤0.030%, Cr:0.50
~0.70%, Ti:0.01~0.05%, Mo:0.15~0.30%, surplus are Fe and inevitable impurity.
6. a kind of production method of 1000MPa grades of superhigh-strength hot strip rollings according to claim 4, which is characterized in that institute
Sheet billet continuous casting process is stated, continuous casting obtains the steel billet of 180~230mm of thickness.
7. a kind of production method of 1000MPa grades of superhigh-strength hot strip rolling according to claim 4-6 any one, special
Sign is, the heating process, through stepped heating stove heating, heating steel billet soaking section temperature >=1260 DEG C, soaking time 30
~35min, total 170~230min of heating time.
8. a kind of production method of 1000MPa grades of superhigh-strength hot strip rolling according to claim 4-6 any one, special
Sign is, the roughing operation, the reciprocating 5 passage roughing of single chassis, single pass high-pressure water descaling, de-scaling water pressure is 20~
25MPa, gained centre 32~38mm of sotck thinkness, batches through Coil Box and overturns end to end.
9. a kind of production method of 1000MPa grades of superhigh-strength hot strip rolling according to claim 4-6 any one, special
Sign is that the coiling process, coiling temperature is 590~640 DEG C.
Priority Applications (1)
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110527810A (en) * | 2019-08-28 | 2019-12-03 | 唐山钢铁集团有限责任公司 | A method of improving slab center toughness using De-scaling box |
| CN111139399A (en) * | 2019-12-19 | 2020-05-12 | 唐山不锈钢有限责任公司 | High-silicon wear-resistant steel NM360 hot-rolled steel strip and production method thereof |
| CN111719082A (en) * | 2020-05-06 | 2020-09-29 | 唐山不锈钢有限责任公司 | Hot-rolled weather-resistant steel strip and flexible manufacturing method thereof |
| CN112572621A (en) * | 2020-12-29 | 2021-03-30 | 安徽安凯华夏汽车配件制造有限公司 | High-strength rear suspension device for automobile cab |
| CN114000064A (en) * | 2021-10-29 | 2022-02-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Ultrahigh-strength hot-rolled steel strip with thickness less than 4mm and production method thereof |
| CN114101339A (en) * | 2021-10-29 | 2022-03-01 | 唐山钢铁集团有限责任公司 | Production method for thinning hot-rolled high-strength strip steel with over 980MPa |
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| CN110527810A (en) * | 2019-08-28 | 2019-12-03 | 唐山钢铁集团有限责任公司 | A method of improving slab center toughness using De-scaling box |
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| CN111139399A (en) * | 2019-12-19 | 2020-05-12 | 唐山不锈钢有限责任公司 | High-silicon wear-resistant steel NM360 hot-rolled steel strip and production method thereof |
| CN111139399B (en) * | 2019-12-19 | 2021-08-13 | 唐山不锈钢有限责任公司 | High-silicon wear-resistant steel NM360 hot-rolled steel strip and production method thereof |
| CN111719082A (en) * | 2020-05-06 | 2020-09-29 | 唐山不锈钢有限责任公司 | Hot-rolled weather-resistant steel strip and flexible manufacturing method thereof |
| CN112572621A (en) * | 2020-12-29 | 2021-03-30 | 安徽安凯华夏汽车配件制造有限公司 | High-strength rear suspension device for automobile cab |
| CN114000064A (en) * | 2021-10-29 | 2022-02-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Ultrahigh-strength hot-rolled steel strip with thickness less than 4mm and production method thereof |
| CN114101339A (en) * | 2021-10-29 | 2022-03-01 | 唐山钢铁集团有限责任公司 | Production method for thinning hot-rolled high-strength strip steel with over 980MPa |
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