CN108396259A - A kind of high reaming performance hot rolling galvanized steel plain sheet and its manufacturing method - Google Patents
A kind of high reaming performance hot rolling galvanized steel plain sheet and its manufacturing method Download PDFInfo
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- CN108396259A CN108396259A CN201710064832.3A CN201710064832A CN108396259A CN 108396259 A CN108396259 A CN 108396259A CN 201710064832 A CN201710064832 A CN 201710064832A CN 108396259 A CN108396259 A CN 108396259A
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- 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
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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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
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- 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
- C21D2211/001—Austenite
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- 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
- C21D2211/002—Bainite
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
A kind of high reaming performance hot rolling galvanized steel plain sheet and its manufacturing method, chemical composition are：C 0.08~0.40%, Si 0.50~2.50%, Mn 1.10~3.00%, P≤0.020%, S≤0.010%, Al 0.02~2.00%；Also contain at least one of Cr 0.20~1.00%, Ni 0.20~3.00%, Mo 0.20~1.50%, V 0.05~0.20%, Nb 0.02~0.10%, Ti 0.02~0.10% in its chemical composition.Finally it is organized as ferrite bainite+retained austenite.Hot-strip finishing temperature and the beginning of cooling temperature are controlled in austenitic area, are batched after being cooled to bainite transformation temperature；Continuous Hot Dip Galvanizing Line heating temperature, holding temperature are 450~600 DEG C, and galvanizing flux ingredient contains Al 0.2%~0.5%.The present invention can be energy saving, reduces cost, and the hot rolling galvanized steel plain sheet yield strength >=600MPa produced, elongation >=20%, λ >=40 are fully able to meet the high demand of the industries such as automobile, building, electromechanics.
Description
Technical field
The invention belongs to metallurgical technology fields, more particularly to a kind of to have high intensity, high tenacity, high fatigue property, high expansion
The hot rolling galvanized steel plain sheet and its manufacturing method of pore performance.
Background technology
High intensity, long-life are both the needs that steel comply with technological progress, and build a conservation-minded society, realize it is sustainable
The requirement of development, therefore high-strength galvanized sheet is increasingly becoming the developing direction of steel in recent years.It is compared to lvanized cold rolled strip, heat
It rolls galvanized sheet and has some unique advantages, be in particular in：1, cold rolling process is needed not move through, cost is reduced；2, it is plating
The heat treatments such as sufficient recrystallization annealing need not be carried out in annealing operation before zinc, saved the energy；It 3, can be fully sharp
Steel performance is easily controlled with the controlled rolling and controlled cooling in course of hot rolling, improves the comprehensive mechanical property of steel.
According to hot rolling heat zinc coating plate process study and application (Zhang Juanmei, Shanxi is metallurgical, the 1st phase in 2010) and China
The reality in (world's metal Leader, December 14 the 001st edition in 2000), existing hot rolling base are urgently developed in hot rolled galvanized sheet market
For plate galvanized sheet kind mainly based on mild steel, straight carbon steel and low-alloy steel, low-carbon hot-rolled steel is mainly SPHC, CPHD, SPHE
Deng for straight carbon steel based on Q195, Q235, Q345, low-alloy steel is mainly yield strength 350MPa steel grades below.Existing steel grade
Intensity rank is relatively low, in order to improve the service efficiency of hot rolled steel plate, is badly in need of the efficient high-strength high-toughness hot of exploitation and rolls substrate plating
Zine plate.
Invention content
The present invention is intended to provide one kind can be energy saving, cost is reduced, meets the high-end of the industries such as automobile, building, electromechanics
Demand, the hot-rolled substrate galvanized steel plain sheet with high intensity, high tenacity and excellent reaming performance.
For this purpose, the technical solution that the present invention is taken is：
A kind of high reaming performance hot rolling galvanized steel plain sheet, chemical composition mass percent are：C 0.08%~0.40%,
Si0.50%~2.50%, Mn1.10%~3.00%, P≤0.020%, S≤0.010%, Al 0.02%~2.00%；Its
In chemical composition also contain Cr0.20%~1.00%, Ni0.20%~3.00%, Mo0.20%~1.50%, V0.05%~
0.20%, the one or several kinds in Nb0.02%~0.10%, Ti0.02%~0.10%, remaining can not keep away for Fe with some
The impurity element exempted from；
Finally tissue group becomes the steel plate：Ferrite bainite+retained austenite, volume fraction are respectively：Lath shellfish
Family name's body 60%~90%, retained austenite 10%~40%.
The mechanism of action of chemical composition of the present invention is：
C 0.08%~0.40% improves the quenching degree of steel, improves the intensity of bainite, is carried for the rich carbon of retained austenite
For enough carbon, expand austenitic area.The intensity of the too low steel of content is insufficient, and content too high welding performance is poor, and the plasticity of steel is deteriorated.
Si 0.50%~2.50%, solution strengthening element, while the precipitation of cementite can be inhibited, it postpones pearlite and turns
Become, stable austenite.
Mn 1.10%~3.00%, solution strengthening element improve the quenching degree of steel, expand austenitic area, reduce martensite
Transition temperature.
P≤0.020%, the fewer impurity element the better, but is less than the performance after 0.020% for steel without too big
Influence.
The fewer S≤0.010%, the impurity element in steel the better.
Al 0.02%~2.00%, main deoxidant element in steel, solution strengthening element, while cementite can be inhibited
Precipitation, stable austenite reduces influence of the selective oxidation for hot-dip of steel.
Cr 0.20%~1.00%, solution strengthening element can significantly improve the stability and quenching degree of metastable austenite,
Increase the supercooling ability of austenite, postpones ferrite and pearlite transformation, be conducive to the appearance in metastable austenite area.
Ni 0.20%~3.00%, solution strengthening element improve the quenching degree of steel.
Mo0.20%~1.50%, solution strengthening element improve the quenching degree of steel, reduce technique and the performance of steel is stablized
Property influence, Mo has very strong solute drag interaction, clearly to the inhibiting effect of perlitic transformation.
V, Nb, Ti can be with crystal grain thinning, precipitation strength steel plates.
A kind of manufacturing method of high reaming performance hot rolling galvanized steel plain sheet carries out hot-dip by raw steel plate of hot rolling acid-cleaning plate
Zinc, specific method are：
The steel of the ingredient after smelting, casting, hot rolling, pickling, the finishing temperature control of hot-strip in austenitic area,
The beginning of cooling temperature is controlled in austenitic area, and the cooling velocity to be more than 20 DEG C/s is rolled up after being cooled to the bainite transformation temperature of steel
It takes；It is controlled at 450~600 DEG C in heating temperature, the holding temperature of Continuous Hot Dip Galvanizing Line, then carries out galvanizing, zinc
Liquid ingredient contains Al 0.2%~0.5%, and surplus is the zinc liquid of Zn and inevitable impurity element, obtains being organized as lath after zinc-plated
The high reaming performance hot rolling galvanized steel plain sheet of bainite+retained austenite.
Galvanizing heating temperature, the holding temperature of preferential recommendation are 460~520 DEG C.
Hot rolling finishing temperature control avoids the unstable of mixed crystal and the operation of rolling, water cooling start temperature exists in austenitic area
Austenitic area can obtain the tissue of bainite+austenite.Cooling terminal is the bainite transformation temperature section of the steel, can
It is organized as ferrite bainite and retained austenite with ensure steel.Galvanizing heating temperature, holding temperature control are at 450 DEG C -600
DEG C, temperature is less than 450 DEG C, cannot meet the technological requirement of galvanizing by dipping, temperature is excessively high, will cause the decomposition of bainite, causes
The drastically decline of hardness of steel, while being heated to the temperature region and can promote expansion of the carbon atom in steel into retained austenite
It dissipates, stable residual austenite.Hot dipping plating is carried out after hot rolled plate pickling immediately, avoids the shadow for hot-dip due to corrosion
It rings.Strip cooling velocity after hot rolling is more than 20 degree per seconds, can avoid perlitic transformation.
Beneficial effects of the present invention are：
Present component assembles rationally, simple for process, can be energy saving, reduces cost, the hot-rolled substrate produced
Galvanized steel plain sheet, have high intensity, high tenacity and excellent reaming performance, yield strength >=600MPa, elongation >=20%, λ >=
40, it is fully able to meet the high demand of the industries such as automobile, building, electromechanics.
Specific implementation mode
Embodiment 1：
The chemical composition of steel：C 0.09%, Si0.51%, Mn1.11%, P≤0.015%, S≤0.005%,
Al0.80%, remaining is Fe and some inevitable impurity elements.
Manufacturing method：The steel of the ingredient after smelting, casting, hot rolling, pickling, steel plate Continuous Hot Dip Galvanizing Line into
Row galvanizing obtains super high strength hot rolled substrate galvanized sheet.880 DEG C of hot rolling finishing temperature, it is 850 DEG C to open cold temperature, cooling speed
Spend >=40 DEG C/s, 480 DEG C of coiling temperature, thickness specification 3.0mm；Galvanizing heating and thermal insulation temperature is 460 DEG C, soaking time
120s, plating solution composition are：Zinc liquid contains 0.3%Al.Finally it is organized as：+ 10% remnants A of 90% ferrite bainite.
End properties：Yield strength 610MPa, tensile strength 790MPa, elongation 30%, λ >=70, coating adhesion are good
Good, surface quality meets FB grades of surface requirements.
Embodiment 2：
The chemical composition of steel：C0.40%, Si1.20%, Mn3.00%, P≤0.018%, S≤0.005%,
Al0.03%, Ni0.40%, remaining is Fe and some inevitable impurity elements.
Manufacturing process：The steel of the ingredient after smelting, casting, hot rolling, pickling, steel plate Continuous Hot Dip Galvanizing Line into
Row galvanizing obtains super high strength hot rolled substrate galvanized sheet.900 DEG C of hot rolling finishing temperature opens 850 DEG C of cold temperature, cooling velocity
>=30 DEG C/s, 350 DEG C of coiling temperature, thickness specification 4.0mm；480 DEG C, soaking time 160s of galvanizing heating and thermal insulation temperature, plating
Liquid ingredient is：Zinc liquid contains 0.5%Al.Finally it is organized as：+ 40% retained austenite of 60% ferrite bainite.
End properties：Yield strength 930MPa, tensile strength 1260MPa, elongation 21%, λ >=41, coating adhesion are good
Good, surface quality meets FB grades of surface requirements.
Embodiment 3：
The chemical composition of steel：C 0.30%, Si2.49%, Mn2.50%, P≤0.020%, S≤0.002%,
Al0.02%, Mo0.40%, remaining is Fe and some inevitable impurity elements.
Manufacturing process：The steel of the ingredient after smelting, casting, hot rolling, pickling, steel plate Continuous Hot Dip Galvanizing Line into
Row galvanizing obtains super high strength hot rolled substrate galvanized sheet.880 DEG C of hot rolling finishing temperature opens 840 DEG C of cold temperature, cooling velocity
>=20 DEG C/s, 550 DEG C of coiling temperature, thickness specification 6.0mm；520 DEG C, soaking time 100s of galvanizing heating and thermal insulation temperature, plating
Liquid ingredient is：Zinc liquid contains 0.3%Al.Finally it is organized as：+ 28% retained austenite of 72% ferrite bainite.
End properties：Yield strength 780MPa, tensile strength 1020MPa, elongation 27%, the coating adhesions of λ >=51 are good
Good, surface quality meets FA grades of surface requirements.
Embodiment 4：
The chemical composition of steel：C 0.25%, Si0.80%, Mn2.00%, P0.20%, S≤0.030%, Al1.90%,
Cr0.50%, remaining is Fe and some inevitable impurity elements.
Manufacturing process：The steel of the ingredient after smelting, casting, hot rolling, pickling, steel plate Continuous Hot Dip Galvanizing Line into
Row galvanizing obtains super high strength hot rolled substrate galvanized sheet.910 DEG C of hot rolling finishing temperature opens 870 DEG C of cold temperature, cooling velocity
>=100 DEG C/s, 420 DEG C of coiling temperature, thickness specification 2.0mm；500 DEG C, soaking time 90s of galvanizing heating and thermal insulation temperature, plating
Liquid ingredient is：Zinc liquid contains 0.3%Al.Finally it is organized as：+ 32% remnants A of 68% ferrite bainite.
End properties：Yield strength 740MPa, tensile strength 1080MPa, elongation 30%, λ >=68, coating adhesion are good
Good, surface quality meets FB grades of surface requirements.
Embodiment 5：
The chemical composition of steel：C 0.15%, Si1.80%, Mn2.50%, P≤0.020%, S≤0.030%,
Al0.050%, Ni0.50%, Mo0.50%, Ti0.03%, remaining is Fe and some inevitable impurity elements.
Manufacturing process：The steel of the ingredient after smelting, casting, hot rolling, pickling, steel plate Continuous Hot Dip Galvanizing Line into
Row galvanizing obtains super high strength hot rolled substrate galvanized sheet.930 DEG C of hot rolling finishing temperature opens 890 DEG C of cold temperature, cooling velocity
>=60 DEG C/s, 550 DEG C of coiling temperature, thickness specification 2.5mm；590 DEG C, soaking time 60s of galvanizing heating and thermal insulation temperature, plating solution
Ingredient is：Zinc liquid contains 0.3%Al.Finally it is organized as：+ 15% retained austenite of 85% ferrite bainite.
End properties：Yield strength 1050MPa, tensile strength 1270MPa, elongation 28%, λ >=47, coating adhesion
Well, surface quality meets FA grades of surface requirements.
Embodiment 6：
The chemical composition of steel：C 0.28%, Si1.60%, Mn2.20%, P≤0.010%, S≤0.010%,
Al0.040%, Ni3.00%, Nb0.04%, remaining is Fe and some inevitable impurity elements.
Manufacturing process：The steel of the ingredient after smelting, casting, hot rolling, pickling, steel plate Continuous Hot Dip Galvanizing Line into
Row galvanizing obtains super high strength hot rolled substrate galvanized sheet.870 DEG C of hot rolling finishing temperature opens 840 DEG C of cold temperature, cooling velocity
>=150 DEG C/s, 480 DEG C of coiling temperature, thickness specification 3.0mm；550 DEG C, soaking time 90s of galvanizing heating and thermal insulation temperature, plating
Liquid ingredient is：Zinc liquid contains 0.4%Al.Finally it is organized as：+ 23% retained austenite of 77% ferrite bainite.
End properties：Yield strength 960MPa, tensile strength 1120MPa, elongation 25%, λ >=58, coating adhesion are good
Good, surface quality meets FB grades of surface requirements.
Embodiment 7：
The chemical composition of steel：C 0.30%, Si1.00%, Mn1.80%, P≤0.015%, S≤0.020%,
Al0.70%, Mo1.50%, V0.10% remaining be Fe and some inevitable impurity elements.
Manufacturing process：The steel of the ingredient after smelting, casting, hot rolling, pickling, steel plate Continuous Hot Dip Galvanizing Line into
Row galvanizing obtains super high strength hot rolled substrate galvanized sheet.930 DEG C of hot rolling finishing temperature opens 900 DEG C of cold temperature, cooling velocity
>=45 DEG C/s, 550 DEG C of coiling temperature, thickness specification 3.5mm；480 DEG C, soaking time 150s of galvanizing heating and thermal insulation temperature, plating
Liquid ingredient is：Zinc liquid contains 0.2%Al.Finally it is organized as：+ 36% retained austenite of 64% ferrite bainite.
End properties：Yield strength 820MPa, tensile strength 1080MPa, elongation 36%, λ >=88, coating adhesion are good
Good, surface quality meets FA grades of surface requirements.
Embodiment 8：
The chemical composition of steel：C 0.15%, Si1.50%, Mn2.10%, P≤0.010%, S≤0.015%,
Al0.03%, Cr0.40%, Ni0.50%, Mo0.30%, remaining is Fe and some inevitable impurity elements.
Manufacturing process：The steel of the ingredient after smelting, casting, hot rolling, pickling, steel plate Continuous Hot Dip Galvanizing Line into
Row galvanizing obtains super high strength hot rolled substrate galvanized sheet.900 DEG C of hot rolling finishing temperature opens 870 DEG C of cold temperature, cooling velocity
>=28 DEG C/s, 470 DEG C of coiling temperature, thickness specification 4.5mm；490 DEG C, soaking time 120s of galvanizing heating and thermal insulation temperature, plating
Liquid ingredient is：Zinc liquid contains 0.24%Al.Finally it is organized as：+ 20% retained austenite of 80% ferrite bainite.
End properties：Yield strength 810MPa, tensile strength 1180MPa, elongation 30%, λ >=74, coating adhesion are good
Good, surface quality meets FA grades of surface requirements.
Embodiment 9：
The chemical composition of steel：C 0.33%, Si1.40%, Mn2.10%, P≤0.008%, S≤0.008%,
Al0.04%, Ti0.02%, Nb0.02%, remaining is Fe and some inevitable impurity elements.
Manufacturing process：The steel of the ingredient after smelting, casting, hot rolling, pickling, steel plate Continuous Hot Dip Galvanizing Line into
Row galvanizing obtains super high strength hot rolled substrate galvanized sheet.940 DEG C of hot rolling finishing temperature opens 900 DEG C of cold temperature, cooling velocity
>=80 DEG C/s, 480 DEG C of coiling temperature, thickness specification 2.5mm；510 DEG C, soaking time 100s of galvanizing heating and thermal insulation temperature, plating
Liquid ingredient is：Zinc liquid contains 0.35%Al.Finally it is organized as：+ 24% retained austenite of 76% ferrite bainite.
End properties：Yield strength 1050MPa, tensile strength 1240MPa, elongation 24%, λ >=55, coating adhesion
Well, surface quality meets FB grades of surface requirements.
Embodiment 10：
The chemical composition of steel：C 0.15%, Si0.50%, Mn1.70%, P≤0.020%, S≤0.020%,
Al0.02%, Cr0.60%, Mo0.20%, remaining is Fe and some inevitable impurity elements.
Manufacturing process：The steel of the ingredient after smelting, casting, hot rolling, pickling, steel plate Continuous Hot Dip Galvanizing Line into
Row galvanizing obtains super high strength hot rolled substrate galvanized sheet.850 DEG C of hot rolling finishing temperature opens 730 DEG C of cold temperature, cooling velocity
>=30 DEG C/s, 440 DEG C of coiling temperature, thickness specification 3.0mm；460 DEG C, soaking time 120s of galvanizing heating and thermal insulation temperature, plating
Liquid ingredient is：Zinc liquid contains 0.3%Al.Finally it is organized as：+ 35% retained austenite of 65% ferrite bainite.
End properties：Yield strength 610MPa, tensile strength 1000MPa, elongation 39%, λ >=88, coating adhesion are good
Good, surface quality meets FB grades of surface requirements.
Claims (3)
1. a kind of high reaming performance hot rolling galvanized steel plain sheet, which is characterized in that chemical composition mass percent is：C0.08%~
0.40%, Si0.50%~2.50%, Mn1.10%~3.00%, P≤0.020%, S≤0.010%, Al0.02%~
2.00%；In its chemical composition also contain Cr0.20%~1.00%, Ni0.20%~3.00%, Mo0.20%~1.50%,
One or several kinds in V0.05%~0.20%, Nb0.02%~0.10%, Ti0.02%~0.10%, remaining for Fe and
Some inevitable impurity elements；
Finally tissue group becomes the steel plate：Ferrite bainite+retained austenite, volume fraction are respectively：Ferrite bainite
60%~90%, retained austenite 10%~40%.
2. a kind of manufacturing method of high reaming performance hot rolling galvanized steel plain sheet as described in claim 1, which is characterized in that with hot rolling acid
Board-washing is that raw steel plate carries out galvanizing by dipping, and specific method is：
The steel of the ingredient is after smelting, casting, hot rolling, pickling, and the finishing temperature control of hot-strip is in austenitic area, cooling
Start temperature is controlled in austenitic area, and the cooling velocity to be more than 20 DEG C/s is batched after being cooled to the bainite transformation temperature of steel；
Controlled at 450~600 DEG C in heating temperature, the holding temperature of Continuous Hot Dip Galvanizing Line, then carry out galvanizing, zinc liquid at
Divide and contain Al 0.2%~0.5%, surplus is the zinc liquid of Zn and inevitable impurity element, obtains being organized as lath bayesian after zinc-plated
The high reaming performance hot rolling galvanized steel plain sheet of body+retained austenite.
3. the manufacturing method of high reaming performance hot rolling galvanized steel plain sheet according to claim 2, which is characterized in that preferential recommendation
Galvanizing heating temperature, holding temperature be 460~520 DEG C.
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| CN110512146A (en) * | 2019-09-05 | 2019-11-29 | 首钢集团有限公司 | A kind of super high strength hot rolled pickling reaming steel and its production method with Good All-around Property |
| CN111979490A (en) * | 2020-09-07 | 2020-11-24 | 鞍钢股份有限公司 | High-ductility and high-formability cold-rolled DH590 steel and production method thereof |
| CN112647011A (en) * | 2020-12-19 | 2021-04-13 | 台州学院 | Preparation method of fine-grain high-strength and high-toughness bainitic steel |
| CN113403548A (en) * | 2021-05-21 | 2021-09-17 | 鞍钢股份有限公司 | 1470 MPa-grade high-hole-expansion steel plate for cold stamping and preparation method thereof |
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