CN108411206A - A kind of tensile strength 540MPa grades of Thin Specs hot-rolled dual-phase steels and its manufacturing method - Google Patents
A kind of tensile strength 540MPa grades of Thin Specs hot-rolled dual-phase steels and its manufacturing method Download PDFInfo
- Publication number
- CN108411206A CN108411206A CN201810320324.1A CN201810320324A CN108411206A CN 108411206 A CN108411206 A CN 108411206A CN 201810320324 A CN201810320324 A CN 201810320324A CN 108411206 A CN108411206 A CN 108411206A
- Authority
- CN
- China
- Prior art keywords
- tensile strength
- thin specs
- rolled dual
- specs hot
- hot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- 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
- C22C38/04—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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
A kind of tensile strength 540MPa grades of Thin Specs hot-rolled dual-phase steels and its manufacturing method, belong to metallurgical technology field；The chemical composition of dual phase steel is by weight percent：C：0.04~0.065%, Si：0.05~0.14%, Mn：0.40~0.56%, Cr：0.20~0.30%, S：≤ 0.014%, P：≤ 0.018%, Als：0.02~0.04%, surplus is Fe and inevitable impurity.The manufacturing method of dual phase steel：1) by pouring molten steel at ingot casting；2) Direct Rolling is carried out to ingot casting；3) the air-cooled water cooling three-stage of water cooling is carried out to strip to cool down；The present invention uses strand direct rolling process, reduce the preceding heating process of rolling, give full play to the effect of large deformation crystal grain thinning, reduce the usage amount of manganese, chromium and silicon, it is not required to add other valuable microalloy elements, production cost significantly reduces, and production efficiency improves, steel plate even tissue, surface quality are good, realize dual phase steel with hot Dai Leng.
Description
Technical field
The invention belongs to metallurgical technology field, more particularly to a kind of tensile strength 540MPa grades of Thin Specs hot-rolled dual-phase steels and
Its manufacturing method.
Background technology
In order to realize automobile minimizing and improve fuel efficiency, high-strength steel sheet gradually increases in the application of automobile manufacturing field
Add.In these high-strength steel sheets, dual phase steel is because with the combination of good obdurability, lower yield tensile ratio (Rp0.2/Rm), it is higher
Elongation percentage and work hardening rate, and continuous surrender is presented, punching component is readily formed, springs back small, diel abrasion
It is small, the application conditions of a variety of components of automobile can be met, the application of wherein 540~600MPa of tensile strength grades hot-rolled dual-phase steels is most
To be extensive, but the thickness of such steel plate is mostly in 2.0mm or more, and to be 2.0mm or less bands mostly use greatly cold rolling+company to thickness
Continuous annealing way is produced, and production cost is higher, and production efficiency is relatively low.Therefore, the Thin Specs hot rolling of thickness≤2.0mm is developed
Dual phase steel promotes automotive sheet to be of great significance with hot Dai Leng the application range of expansion hot-rolled dual-phase steel.
Patent CN200910302439.9 disclose a kind of tensile strength 540MPa grades of hot rolling biphase plate for vehicle wheel and its
Production method, added in composition design 1.50~1.70% manganese (Mn), 0.30~0.60% chromium (Cr) and 0.01~
0.06% titanium (Ti), cost is higher, and silicon (Si) content is 0.6~1.0%, easily forms red scale, leads to steel plate table
Face is second-rate, while rolling preceding strand and needing to heat, and production efficiency is relatively low；Patent CN200610045847.7 discloses one kind
540MPa grades of dual phase sheet steels of tensile strength and manufacturing method, steel plate thickness are 2.5~6.0mm, and 1.00 are added in composition design
~1.30% manganese (Mn), cost is higher, and silicon (Si) content is 0.20~0.40%, easily forms red scale, leads to steel
Plate surface is second-rate, while rolling preceding strand and needing to heat, and production efficiency is relatively low；Patent CN200510047979.9 is disclosed
The hot-rolled dual-phase steel and its production technology that a kind of tensile strength is 500~610MPa, steel plate thickness are 2.5~4.5mm, ingredient
0.015~0.02% niobium (Nb) and 0.013~0.03% titanium (Ti) are added in design, cost is higher, and carbon (C) content is
0.08~0.10%, elongation percentage is relatively low, is also degrading forming property and welding performance, while rolling preceding strand and needing to heat, raw
It produces less efficient；Patent CN200680051836.8 discloses a kind of hot rolled dual phase steel strip with cold-strip characteristic, steel
Plate thickness is 1.0~8.0mm, the manganese (Mn) of addition 1.0~2.0% in composition design ,≤0.30% nickel (Ni) and≤
0.03% molybdenum (Mo), cost is higher, and silicon (Si) content≤0.80% easily forms red scale, leads to surface of steel plate matter
It measures poor, while needing in induction furnace heating after roughing and in the stove inside holding with internal mandrel, production efficiency is relatively low.
Invention content
For various problems of the existing technology, it is double that the present invention provides a kind of tensile strength 540MPa grades of Thin Specs hot rolling
Phase steel and its manufacturing method.
A kind of tensile strength 540MPa grades of Thin Specs hot-rolled dual-phase steels of the present invention, chemical composition is by weight percent
For：C：0.04~0.065%, Si：0.05~0.14%, Mn：0.40~0.56%, Cr：0.20~0.30%, S：≤
0.014%, P：≤ 0.018%, Als：0.02~0.04%, surplus is Fe and inevitable impurity.
The Thin Specs hot-rolled dual-phase steel is organized as ferrite and martensite duplex structure, and wherein ferrite volume fraction is
86~95%, Martensite Volume Fraction is 5~14%, and ferrite average grain size is 3.1~5.2 μm.
The Thin Specs hot-rolled dual-phase steel thickness is 1.4~2.0mm, and tensile strength is 565~597MPa, and yield strength is
347~370MPa, yield tensile ratio are 0.61~0.62, and elongation after fracture is 31.0~34.4%.
A kind of manufacturing method of tensile strength 540MPa grades of Thin Specs hot-rolled dual-phase steels, comprises the following steps that：
(1) molten steel is gone out using vacuum induction melting and pours into ingot casting, the chemical composition of ingot casting is by weight percent：
C: 0.04~0.065%, Si：0.05~0.14%, Mn：0.40~0.56%, Cr：0.20~0.30%, S：≤ 0.014%,
P：≤ 0.018%, Als：0.02~0.04%, surplus is Fe and inevitable impurity；
(2) Direct Rolling is carried out to ingot casting, start rolling temperature is 1125~1170 DEG C, it is total accumulate reduction ratio be 96.0~
97.2%, finishing temperature is 845~880 DEG C, obtains the strip that thickness is 1.4~2.0mm；
(3)-water cooling three-stage air-cooled to strip progress water cooling-cools down, and I sections of cooling by water speed are 5~10 DEG C/s, cold eventually
Temperature is 690~730 DEG C, and II sections of air cooling times are 1.2~4.0s, and III sections of cooling by water speed are 37~44 DEG C/s, eventually cold temperature
Degree is 250~350 DEG C, obtains 540MPa grades of Thin Specs hot-rolled dual-phase steels of tensile strength.
The manufacturing method of above-mentioned 540MPa grades of Thin Specs hot-rolled dual-phase steels of tensile strength, wherein：
In the step (1), the thickness of ingot casting is 50mm；
In the step (1), the Direct Rolling of demoulding progress immediately after ingot solidification (without heating)；
In the step (2), by 4~5 passes, single pass reduction ratio is 46.9~56.0%.
A kind of tensile strength 540MPa grades of Thin Specs hot-rolled dual-phase steels and its manufacturing method of the present invention, with prior art phase
Than having the beneficial effect that：
(1) usage amount for substantially reducing manganese in steel (Mn) and chromium (Cr) is not required to add other valuable microalloy elements, give birth to
The more traditional hot-rolled dual-phase steel cost of 540MPa grades of Thin Specs hot-rolled dual-phase steels of tensile strength of production declines to a great extent；
(2) while substantially reducing the usage amount of manganese in steel (Mn), the banded structure in steel is significantly alleviated, steel is reduced
In MnS be mingled with, improve steel plate structural homogenity；
(3) using the composition design thinking of low silicon (Si), reduce the red scale of surface of steel plate, surface of steel plate matter
Amount is good；
(4) strand direct rolling process is used, the heating process before rolling is reduced, production efficiency significantly improves；
(5) finished product thickness is 1.4~2.0mm, effectively thin by large deformation (single pass reduction ratio is 46.9~56.0%)
Change crystal grain (ferrite average grain size is only 3.1~5.2 μm), reduces the usage amount of alloying element in steel；
(6) there is Thin Specs hot-rolled dual-phase steel of the invention high-strength plasticity, low yield strength ratio to be readily formed, and can substitute biography
Unite cold-rolled biphase steel be used for automotive body structure part manufacture, realize dual phase steel with hot Dai Leng.
Description of the drawings
540MPa grades of Thin Specs hot-rolled dual-phase steels of tensile strength prepared by Fig. 1 embodiment of the present invention 2 are through LEPERA reagents
(1%Na2S2O5+ 4% picral of aqueous solution) corrosion after macrograph；
The stress strain curve of 540MPa grades of Thin Specs hot-rolled dual-phase steels of tensile strength prepared by Fig. 2 embodiment of the present invention 3.
Specific implementation mode
With reference to embodiment, the invention will be further described, but protection scope of the present invention is not limited only to following implementation
Example.
Embodiment 1
A kind of tensile strength 540MPa grades of Thin Specs hot-rolled dual-phase steels, chemical composition are by weight percent：C：
0.065%, Si：0.14%, Mn：0.56%, Cr：0.30%, S：0.008%, P：0.010%, Als：0.04%, surplus Fe
With inevitable impurity.
A kind of manufacturing method for the 540MPa grades of Thin Specs hot-rolled dual-phase steels of tensile strength that thickness is 1.4mm, including it is following
Processing step：
(1) vacuum induction melting is used, pours into the ingot casting that thickness is 50mm, the chemical composition of ingot casting is by weight percent
For：C：0.065%, Si：0.14%, Mn：0.56%, Cr：0.30%, S：0.008%, P：0.010%, Als：0.04%, it is remaining
Amount is Fe and inevitable impurity, is demoulded immediately after ingot solidification and carries out Direct Rolling (without heating)；
(2) Direct Rolling is carried out to ingot casting, start rolling temperature is 1125 DEG C, and by 5 passes, pressure passage is assigned as
50mm → 24mm → 11.8mm → 5.9mm → 2.9mm → 1.4mm, total reduction ratio of accumulating is 97.2%, and finishing temperature is 845 DEG C,
Obtain the strip that thickness is 1.4mm；
(3)-water cooling three-stage air-cooled to strip progress water cooling-cools down, and I sections of cooling by water speed are 10 DEG C/s, eventually cold temperature
Degree is 730 DEG C, and II sections of air cooling times are 1.2s, and III sections of cooling by water speed are 44 DEG C/s, and final cooling temperature is 350 DEG C, is resisted
540MPa grades of Thin Specs hot-rolled dual-phase steels of tensile strength.
Thickness is that the Thin Specs hot-rolled dual-phase steel of 1.4mm is organized as ferrite and martensite duplex structure, wherein ferrite
Volume fraction is 86%, Martensite Volume Fraction 14%, and ferrite average grain size is 3.1 μm；Tensile strength is
597MPa, yield strength 370MPa, yield tensile ratio 0.62, elongation after fracture 31.0%.
Embodiment 2
A kind of tensile strength 540MPa grades of Thin Specs hot-rolled dual-phase steels, chemical composition are by weight percent：C∶
0.051%, Si：0.11%, Mn：0.44%, Cr：0.24%, S：0.011%, P：0.018%, Als：0.04%, surplus Fe
With inevitable impurity.
A kind of manufacturing method for the 540MPa grades of Thin Specs hot-rolled dual-phase steels of tensile strength that thickness is 1.7mm, including it is following
Processing step：
(1) vacuum induction melting is used, pours into the ingot casting that thickness is 50mm, the chemical composition of ingot casting is by weight percent
For：C：0.051%, Si：0.11%, Mn：0.44%, Cr：0.24%, S：0.011%, P：0.018%, Als：0.04%, it is remaining
Amount is Fe and inevitable impurity, is demoulded immediately after ingot solidification and carries out Direct Rolling (without heating)；
(2) Direct Rolling is carried out to ingot casting, start rolling temperature is 1150 DEG C, and by 5 passes, pressure passage is assigned as
50mm → 25mm → 12.5mm → 6.2mm → 3.2mm → 1.7mm, total reduction ratio of accumulating is 96.6%, and finishing temperature is 860 DEG C,
Obtain the strip that thickness is 1.7mm；
(3)-water cooling three-stage air-cooled to strip progress water cooling-cools down, and I sections of cooling by water speed are 8 DEG C/s, final cooling temperature
It it is 710 DEG C, II sections of air cooling times are 2.6s, and III sections of cooling by water speed are 40 DEG C/s, and final cooling temperature is 285 DEG C, obtains tension
540MPa grades of Thin Specs hot-rolled dual-phase steels of intensity.
Thickness is that the Thin Specs hot-rolled dual-phase steel of 1.7mm is organized as ferrite and martensite duplex structure, is tried through LEPERA
Agent (1%Na2S2O5+ 4% picral of aqueous solution) macrograph after corrosion is as shown in Figure 1, wherein ferrite
Score is 91%, Martensite Volume Fraction 9%, and ferrite average grain size is 4.2 μm；Tensile strength is 583MPa, is bent
It is 355MPa, yield tensile ratio 0.61, elongation after fracture 32.9% to take intensity.
Embodiment 3
A kind of tensile strength 540MPa grades of Thin Specs hot-rolled dual-phase steels, chemical composition are by weight percent：C：
0.04%, Si：0.05%, Mn：0.40%, Cr：0.20%, S：0.014%, P：0.016%, Als：0.02%, surplus Fe
With inevitable impurity.
A kind of manufacturing method for the 540MPa grades of Thin Specs hot-rolled dual-phase steels of tensile strength that thickness is 2.0mm, including it is following
Processing step：
(1) vacuum induction melting is used, pours into the ingot casting that thickness is 50mm, the chemical composition of ingot casting is by weight percent
For：C：0.04%, Si：0.05%, Mn：0.40%, Cr：0.20%, S：0.014%, P：0.016%, Als：0.02%, surplus
For Fe and inevitable impurity, after ingot solidification demoulding immediately carry out Direct Rolling (without heating)；
(2) Direct Rolling is carried out to ingot casting, start rolling temperature is 1170 DEG C, and by 4 passes, pressure passage is assigned as
50mm → 22mm → 9.7mm → 4.4mm → 2.0mm, total reduction ratio of accumulating is 96.0%, and finishing temperature is 880 DEG C, obtains thickness
For the strip of 2.0mm；
(3)-water cooling three-stage air-cooled to strip progress water cooling-cools down, and I sections of cooling by water speed are 5 DEG C/s, final cooling temperature
It it is 690 DEG C, II sections of air cooling times are 4.0s, and III sections of cooling by water speed are 37 DEG C/s, and final cooling temperature is 250 DEG C, obtains tension
540MPa grades of Thin Specs hot-rolled dual-phase steels of intensity.
Thickness is that the Thin Specs hot-rolled dual-phase steel of 2.0mm is organized as ferrite and martensite duplex structure, wherein ferrite
Volume fraction is 95%, Martensite Volume Fraction 5%, and ferrite average grain size is 5.2 μm；Stress strain curve such as Fig. 2 institutes
Show, tensile strength 565MPa, yield strength 347MPa, yield tensile ratio 0.61, elongation after fracture 34.4%.
Embodiment 4
A kind of tensile strength 540MPa grades of Thin Specs hot-rolled dual-phase steels, chemical composition are by weight percent：C：
0.062%, Si：0.09%, Mn：0.51%, Cr：0.28%, S：0.012%, P：0.009%, Als：0.03%, surplus Fe
With inevitable impurity.
A kind of manufacturing method for the 540MPa grades of Thin Specs hot-rolled dual-phase steels of tensile strength that thickness is 1.5mm, including it is following
Processing step：
(1) vacuum induction melting is used, pours into the ingot casting that thickness is 50mm, the chemical composition of ingot casting is by weight percent
For：C：0.062%, Si：0.09%, Mn：0.51%, Cr：0.28%, S：0.012%, P：0.009%, Als：0.03%, it is remaining
Amount is Fe and inevitable impurity, is demoulded immediately after ingot solidification and carries out Direct Rolling (without heating)；
(2) Direct Rolling is carried out to ingot casting, start rolling temperature is 1135 DEG C, and by 5 passes, pressure passage is assigned as
50mm → 25mm → 12.5mm → 6.2mm → 3.1mm → 1.5mm, total reduction ratio of accumulating is 97.0%, and finishing temperature is 850 DEG C,
Obtain the strip that thickness is 1.5mm；
(3)-water cooling three-stage air-cooled to strip progress water cooling-cools down, and I sections of cooling by water speed are 9 DEG C/s, final cooling temperature
It it is 725 DEG C, II sections of air cooling times are 1.7s, and III sections of cooling by water speed are 43 DEG C/s, and final cooling temperature is 330 DEG C, obtains tension
540MPa grades of Thin Specs hot-rolled dual-phase steels of intensity.
Thickness is that the Thin Specs hot-rolled dual-phase steel of 1.5mm is organized as ferrite and martensite duplex structure, wherein ferrite
Volume fraction is 89%, Martensite Volume Fraction 11%, and ferrite average grain size is 3.4 μm；Tensile strength is
592MPa, yield strength 366MPa, yield tensile ratio 0.62, elongation after fracture 31.7%.
Embodiment 5
A kind of tensile strength 540MPa grades of Thin Specs hot-rolled dual-phase steels, chemical composition are by weight percent：C：
0.047%, Si：0.10%, Mn：0.43%, Cr：0.22%, S：0.010%, P：0.006%, Als：0.02%, surplus Fe
With inevitable impurity.
A kind of manufacturing method for the 540MPa grades of Thin Specs hot-rolled dual-phase steels of tensile strength that thickness is 1.8mm, including it is following
Processing step：
(1) vacuum induction melting is used, pours into the ingot casting that thickness is 50mm, the chemical composition of ingot casting is by weight percent
For：C：0.047%, Si：0.10%, Mn：0.43%, Cr：0.22%, S：0.010%, P：0.006%, Als：0.02%, it is remaining
Amount is Fe and inevitable impurity, is demoulded immediately after ingot solidification and carries out Direct Rolling (without heating)；
(2) Direct Rolling is carried out to ingot casting, start rolling temperature is 1155 DEG C, and by 5 passes, pressure passage is assigned as
50mm → 26mm → 12.9mm → 6.6mm → 3.4mm → 1.8mm, total reduction ratio of accumulating is 96.4%, and finishing temperature is 870 DEG C,
Obtain the strip that thickness is 1.8mm；
(3)-water cooling three-stage air-cooled to strip progress water cooling-cools down, and I sections of cooling by water speed are 7 DEG C/s, final cooling temperature
It it is 705 DEG C, II sections of air cooling times are 3.1s, and III sections of cooling by water speed are 39 DEG C/s, and final cooling temperature is 280 DEG C, obtains tension
540MPa grades of Thin Specs hot-rolled dual-phase steels of intensity.
Thickness is that the Thin Specs hot-rolled dual-phase steel of 1.8mm is organized as ferrite and martensite duplex structure, wherein ferrite
Volume fraction is 93%, Martensite Volume Fraction 7%, and ferrite average grain size is 4.6 μm；Tensile strength is
578MPa, yield strength 353MPa, yield tensile ratio 0.61, elongation after fracture 33.3%.
Claims (6)
1. a kind of tensile strength 540MPa grades of Thin Specs hot-rolled dual-phase steels, which is characterized in that the two-phase steel chemical composition presses matter
Measuring percentage is：C：0.04~0.065%, Si：0.05~0.14%, Mn：0.40~0.56%, Cr：0.20~0.30%, S：
≤ 0.014%, P：≤ 0.018%, Als：0.02~0.04%, surplus is Fe and inevitable impurity.
2. a kind of tensile strength 540MPa grades of Thin Specs hot-rolled dual-phase steels according to claim 1, which is characterized in that described
Thin Specs hot-rolled dual-phase steel is organized as ferrite and martensite duplex structure, and wherein ferrite volume fraction is 86~95%, horse
Family name's body volume fraction is 5~14%, and ferrite average grain size is 3.1~5.2 μm.
3. a kind of tensile strength 540MPa grades of Thin Specs hot-rolled dual-phase steels according to claim 1, which is characterized in that described
Thin Specs hot-rolled dual-phase steel thickness is 1.4~2.0mm, and tensile strength is 565~597MPa, and yield strength is 347~370MPa,
Yield tensile ratio is 0.61~0.62, and elongation after fracture is 31.0~34.4%.
4. a kind of manufacturing method of tensile strength 540MPa grades of Thin Specs hot-rolled dual-phase steels described in claim 1, feature exist
In comprising the following steps that：
(1) molten steel is gone out using vacuum induction melting and pours into ingot casting, the chemical composition of ingot casting is by weight percent：C：
0.04~0.065%, Si：0.05~0.14%, Mn：0.40~0.56%, Cr：0.20~0.30%, S：≤ 0.014%, P：
≤ 0.018%, Als：0.02~0.04%, surplus is Fe and inevitable impurity；
(2) Direct Rolling being carried out to ingot casting, start rolling temperature is 1125~1170 DEG C, and total reduction ratio of accumulating is 96.0~97.2%,
Finishing temperature is 845~880 DEG C, obtains the strip that thickness is 1.4~2.0mm；
(3)-water cooling three-stage air-cooled to strip progress water cooling-cools down, and I sections of cooling by water speed are 5~10 DEG C/s, final cooling temperature
It it is 690~730 DEG C, II sections of air cooling times are 1.2~4.0s, and III sections of cooling by water speed are 37~44 DEG C/s, and final cooling temperature is
250~350 DEG C, obtain 540MPa grades of Thin Specs hot-rolled dual-phase steels of tensile strength.
5. a kind of manufacturing method of tensile strength 540MPa grades of Thin Specs hot-rolled dual-phase steels according to claim 4, special
Sign is, in the step (1), the thickness of ingot casting is 50mm.
6. a kind of manufacturing method of tensile strength 540MPa grades of Thin Specs hot-rolled dual-phase steels according to claim 4, special
Sign is, in the step (2), by 4~5 passes, single pass reduction ratio is 46.9~56.0%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810320324.1A CN108411206B (en) | 2018-04-11 | 2018-04-11 | Thin-specification hot-rolled dual-phase steel with tensile strength of 540MPa and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810320324.1A CN108411206B (en) | 2018-04-11 | 2018-04-11 | Thin-specification hot-rolled dual-phase steel with tensile strength of 540MPa and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108411206A true CN108411206A (en) | 2018-08-17 |
| CN108411206B CN108411206B (en) | 2020-01-21 |
Family
ID=63135347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810320324.1A Active CN108411206B (en) | 2018-04-11 | 2018-04-11 | Thin-specification hot-rolled dual-phase steel with tensile strength of 540MPa and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108411206B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115354240A (en) * | 2022-08-24 | 2022-11-18 | 山东钢铁集团日照有限公司 | Economical seawater erosion resistant steel plate and manufacturing method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1172505A (en) * | 1994-12-06 | 1998-02-04 | 埃克森研究工程公司 | Dual-phase high strength steel sheet with good toughness and weldability |
| CN1367846A (en) * | 1999-07-31 | 2002-09-04 | 蒂森克虏伯钢铁(股份)公司 | High resistance steel band or sheet and method for production theirof |
| US20040118489A1 (en) * | 2002-12-18 | 2004-06-24 | Weiping Sun | Dual phase hot rolled steel sheet having excellent formability and stretch flangeability |
| CN101130847A (en) * | 2006-08-24 | 2008-02-27 | 鞍钢股份有限公司 | Diphasic steel plate by continuous casting and rolling middle bar strip and manufacturing method thereof |
| CN103031493A (en) * | 2011-09-29 | 2013-04-10 | 鞍钢股份有限公司 | 650MPa-level low-Si Cr-containing hot-rolled dual phase steel plate and manufacturing method thereof |
| CN104838026A (en) * | 2012-12-11 | 2015-08-12 | 新日铁住金株式会社 | Hot-rolled steel sheet and production method therefor |
| CN106715742A (en) * | 2014-09-17 | 2017-05-24 | 新日铁住金株式会社 | Hot-rolled steel sheet |
-
2018
- 2018-04-11 CN CN201810320324.1A patent/CN108411206B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1172505A (en) * | 1994-12-06 | 1998-02-04 | 埃克森研究工程公司 | Dual-phase high strength steel sheet with good toughness and weldability |
| CN1367846A (en) * | 1999-07-31 | 2002-09-04 | 蒂森克虏伯钢铁(股份)公司 | High resistance steel band or sheet and method for production theirof |
| US20040118489A1 (en) * | 2002-12-18 | 2004-06-24 | Weiping Sun | Dual phase hot rolled steel sheet having excellent formability and stretch flangeability |
| CN101130847A (en) * | 2006-08-24 | 2008-02-27 | 鞍钢股份有限公司 | Diphasic steel plate by continuous casting and rolling middle bar strip and manufacturing method thereof |
| CN103031493A (en) * | 2011-09-29 | 2013-04-10 | 鞍钢股份有限公司 | 650MPa-level low-Si Cr-containing hot-rolled dual phase steel plate and manufacturing method thereof |
| CN104838026A (en) * | 2012-12-11 | 2015-08-12 | 新日铁住金株式会社 | Hot-rolled steel sheet and production method therefor |
| CN106715742A (en) * | 2014-09-17 | 2017-05-24 | 新日铁住金株式会社 | Hot-rolled steel sheet |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115354240A (en) * | 2022-08-24 | 2022-11-18 | 山东钢铁集团日照有限公司 | Economical seawater erosion resistant steel plate and manufacturing method thereof |
| CN115354240B (en) * | 2022-08-24 | 2022-12-27 | 山东钢铁集团日照有限公司 | Economical seawater erosion resistant steel plate and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108411206B (en) | 2020-01-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103243262B (en) | High-strength hot rolled steel plate roll for automobile wheels as well as preparation method thereof | |
| CN100510144C (en) | Steel for extended automobile crossbeam and manufacturing method thereof | |
| CN107881430A (en) | A kind of tensile strength 600MPa levels hot-rolled dual-phase steel and its manufacture method | |
| CN109536846B (en) | High-toughness hot-rolled steel plate with yield strength of 700MPa and manufacturing method thereof | |
| CN107557673B (en) | A kind of high-strength hot rolling acid-cleaning steel plate of high-elongation and its manufacturing method | |
| CN102226250B (en) | Hot rolled steel plate with yield strength being 700MPa and preparation method thereof | |
| CN102925794B (en) | Cold-rolled steel strip for double-layer welded tube and its manufacture mathod | |
| CN110777296B (en) | Ultra-thick X52 pipeline steel hot-rolled coil and production method thereof | |
| CN105239013B (en) | A kind of cold machine-shaping axle housing steel and its manufacture method | |
| CN102618790B (en) | High-strength low-Cr ferrite stainless steel and manufacturing method thereof | |
| CN102363858A (en) | High-strength steel for 750 to 880 MPa-level vehicles and production method thereof | |
| CN101928881A (en) | Hot rolling high-chambering steel plate with tensile strength of 590 MPa and manufacturing process thereof | |
| CN103194689A (en) | High-strength ferrite stainless steel with excellent formability and corrosion-resistant performance and preparation method thereof | |
| CN108754319A (en) | Using the tensile strength >=1800MPa grades of hot forming steel and method of the production of ESP producing lines | |
| CN106609335A (en) | Tensile strength 700 MPa-grade high broaching hot-rolled steel plate and manufacturing method thereof | |
| CN105483545A (en) | 800MPa level hot-rolling high broaching steel plate and manufacturing method thereof | |
| CN113430467B (en) | Thin 1400 MPa-grade bainite steel and manufacturing method thereof | |
| CN108359907A (en) | A kind of high 540MPa grades of hot rolling acid-cleaning strips of reaming performance of no niobium and its production method | |
| CN107385319A (en) | Yield strength 400MPa level Precision Welded Pipe steel plates and its manufacture method | |
| CN109112417A (en) | A kind of tensile strength 590MPa grades of hot rolled steel plates used for automobile wheels | |
| CN109023055B (en) | High-strength high-formability automobile steel plate and production process thereof | |
| CN109943765A (en) | A kind of 800MPa grades of high-yield-ratio cold-rolled biphase steel and preparation method thereof | |
| CN108277441B (en) | A kind of 600MPa grade Ti micro-alloying hot rolling biphase plate and preparation method thereof | |
| CN114150227B (en) | High-toughness hot stamping steel rolled by medium and thin slabs with Rm more than or equal to 1500MPa and production method | |
| CN108411207A (en) | A kind of tensile strength 600MPa grades of Thin Specs hot-rolled dual-phase steels and its manufacturing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |