CN108396260B - High-strength high-hole-expansion-performance galvanized steel sheet and manufacturing method thereof - Google Patents
High-strength high-hole-expansion-performance galvanized steel sheet and manufacturing method thereof Download PDFInfo
- Publication number
- CN108396260B CN108396260B CN201710064850.1A CN201710064850A CN108396260B CN 108396260 B CN108396260 B CN 108396260B CN 201710064850 A CN201710064850 A CN 201710064850A CN 108396260 B CN108396260 B CN 108396260B
- Authority
- CN
- China
- Prior art keywords
- percent
- bainite
- equal
- steel sheet
- less
- 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.)
- Active
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
- C22C38/18—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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- 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
- 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
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
-
- 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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
-
- 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
-
- 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
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
-
- 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
-
- 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
-
- 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 high-strength high-hole-expansion-performance galvanized steel sheet and a manufacturing method thereof are disclosed, the steel sheet comprises the following components: 0.16 to 0.60 percent of C, 0.50 to 2.5 percent of Si, 1.10 to 4.00 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, 0.02 to 3.00 percent of Al, and at least one of 0.30 to 1.50 percent of Cr, 0.25 to 0.60 percent of Mo, 0.50 to 2.50 percent of Ni, 0.20 to 0.50 percent of Cu, 0.05 to 0.50 percent of V, 0.02 to 0.20 percent of Ti and 0.02 to 0.20 percent of Nb. And (2) carrying out recrystallization annealing hot galvanizing on a continuous hot galvanizing line, controlling the structure of the hot rolled steel plate to be ferrite and lower bainite, controlling the cold rolling compression ratio to be 30-70%, heating the continuous annealing to 800-930 ℃ at the speed of more than or equal to 20 ℃/s, cooling the continuous annealing to the bainite transformation temperature at the speed of more than or equal to 40 ℃/s, adjusting the temperature of the strip steel to 450-480 ℃ after transformation, carrying out hot dip galvanizing, and then cooling to room temperature. The galvanized steel sheet has excellent plasticity, welding performance, forming performance, hole expanding performance and flange extending performance, and the production method has excellent economical efficiency and high efficiency.
Description
Technical Field
The invention belongs to the technical field of cold-rolled galvanized steel sheet manufacturing, and particularly relates to a high-strength high-plasticity cold-rolled galvanized steel sheet and a manufacturing method thereof.
Background
With the increasing requirements of energy-saving and environment-friendly laws and regulations, the steel industry must continuously improve the performance of products to meet the requirements. The strength of steel products is improved to save the total usage amount of steel, the corrosion resistance of steel is improved to prolong the service life of steel, and high-strength galvanized plates just meet the requirements of the two aspects, so that great development is achieved in recent years, and galvanized plates of steel types such as dual-phase steel and TRIP steel are developed successively and have great commercial success.
However, soft phase ferrite and hard phase martensite/bainite exist in these steels, and the soft phase and the hard phase cannot be matched in the processes of stamping deformation and hole expansion, so that cracks are generated, and the hole expansion performance of the steel plate is poor. The bainite steel plate has relatively excellent hole expanding performance, but the plasticity of the bainite steel plate does not influence the comprehensive mechanical performance.
Patent application nos. 201010283882.9, 201110383478.3, 201210195411.1, 201210268312.1 are directed mainly to the production of hot rolled steel sheets. 201010283882.9 discloses a high-elongation high-strength low-carbon bainite steel plate and its production method, the chemical components of which are C0.06-0.18%, Si 0.55-1.70%, Mn1.1-1.7, and also contains some Nb, V, Ti, Cr, Ni, Mo, Cu, etc., the process is controlled rolling and cooling of hot rolling, and some heat treatments are carried out subsequently; the structure is bainite, martensite and retained austenite. 201110383478.3 provides an ultra low carbon bainite steel plate and its manufacturing method, the chemical composition is C less than or equal to 0.03%, Si less than or equal to 0.15%, Mn1.2-1.6%, also contains some Nb, V, Ti, Cu, Ni, B, etc., the ultra low carbon bainite steel plate is obtained by controlled rolling and controlled cooling method, and is tempered at 500-. 201210195411.1 discloses an ultra low carbon bainite steel plate and its manufacturing method, similar to 201110383478.3, but with a slightly higher C content and a 3.0-4.5% higher Mn content, and without Cu, Ni and other noble elements. 201210268312.1A boron-containing bainite steel plate contains C0.20-0.35%, Si 0.6-1.6%, Mn 1.5-2.0%, Ti, B, Al and impurities, and is hot rolled plate.
The prior publications are directed to the research results of hot-rolled steel plates in most cases, and there are few reports of cold-rolled high-strength galvanized bainite steel plates.
Disclosure of Invention
The invention provides a high-strength high-hole-expansion-performance galvanized steel sheet and a manufacturing method thereof, and aims to enable the steel sheet to have high strength, high hole expansion performance and high corrosion resistance, reduce the consumption of energy resources and promote sustainable development.
To achieve the purpose, the invention adopts the following technical solutions:
a high-strength high-hole-expansion-performance galvanized steel sheet comprises the following chemical components in percentage by mass: 0.16 to 0.60 percent of C, 0.50 to 2.5 percent of Si, 1.10 to 4.00 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, 0.02 to 3.00 percent of Al, and at least one of 0.30 to 1.50 percent of Cr0.25 to 0.60 percent of Mo0.50 to 2.50 percent of Ni0.50, 0.20 to 0.50 percent of Cu0.05 to 0.50 percent of V, 0.02 to 0.20 percent of Ti0.02 to 0.20 percent of Nb0.02 to 0.20 percent of chemical components; the balance of Fe and some inevitable impurity elements; the steel plate structure comprises 55-85% of bainite and 15-45% of residual austenite, namely B + A, wherein the volume fraction of the bainite is lath-shaped and granular, and the residual austenite is distributed between the bainitics and inside the bainitics.
The steel plate also contains one or two of Ca0.0005% -0.005% and Mg0.0005% -0.005% in chemical components.
A method for manufacturing a galvanized steel sheet with high strength and high hole expansion performance comprises the steps of smelting, continuous casting, hot rolling, acid washing, cold rolling, and then carrying out recrystallization annealing hot galvanizing on a continuous hot galvanizing production line, wherein the hot rolling finishing temperature is not less than 800 ℃, the coiling temperature is 400-600 ℃, the organization structure of the hot rolled steel sheet is controlled to be ferrite and lower bainite, finely dispersed carbides are distributed in bainite tissues, the cold rolling compression ratio is 30-70%, the continuous hot galvanizing production line is not provided with a heat preservation section, and the heating section is selected for rapid induction heating; the continuous annealing process was controlled as follows: rapidly heating to 800-930 ℃ at a speed of not less than 20 ℃/s, immediately cooling to bainite transformation temperature at a speed of not less than 40 ℃/s, adjusting the temperature of the strip steel to 450-480 ℃ after completing bainite isothermal transformation, carrying out hot dip galvanizing, controlling the bainite isothermal transformation time to be 15-150 s, controlling the components of a zinc liquid to be the zinc liquid containing 0.18-0.50% of Al and the balance of Zn and inevitable impurities, and then cooling to room temperature.
0.16 to 0.60 percent of C, and the carbon determines the strength of bainite in the steel of the invention through solid solution strengthening and influences the stability of the residual austenite in the later period. To ensure the stability of the supercooled austenite, it is required to have a high carbon content; to ensure the weldability, it is required to limit the carbon content.
0.50 to 2.50 percent of Si is a non-carbide forming element, has higher solid solution strengthening effect, can promote the enrichment of C to austenite, has the functions of 'clearing' and 'purifying' the C dissolved in ferrite, and is insoluble in cementite, thereby being capable of hindering the transformation of austenite-cementite through carbon diffusion reaction, stabilizing the austenite and leading the residual austenite to stably exist at room temperature. Too high Si content deteriorates the hot dip galvanizability of the steel sheet.
1.10-4.00% of Mn, wherein Mn is a typical austenite stabilizing element, can improve the hardenability of steel and plays a certain role in solid solution strengthening, and Mn is an element for expanding a gamma phase region, can reduce critical points A3 and A1, can delay pearlite transformation and reduce bainite transformation temperature, but also delays and prolongs ferrite transformation, so that a bainite region is shifted to the right, and the sensitivity of steel to the cooling control process condition is slightly reduced. The high Mn content tends to cause a band-like distribution of the strengthening phase in the two-phase structure, resulting in non-uniformity of the properties.
P is less than or equal to 0.020%, and solid solution strengthening elements inhibit the precipitation of cementite.
S is less than or equal to 0.010 percent, and the less the impurity elements in the steel, the better. 0.02% to 3.00% of Al, which has an influence on the austenite form similar to that of Si, is a non-carbide-forming element, promotes the enrichment of C into austenite, and suppresses the precipitation of cementite.
Al can also form AlN precipitation, and plays a certain role in grain refinement.
0.3-1.5 percent of Cr0.3 percent, can effectively improve the hardenability of steel, prevent high-temperature surface oxidation, and simultaneously improve the corrosion resistance and the strength.
Mo0.25-0.60% effectively improves the hardenability of the steel and strengthens the grain boundary. The above effect is hardly obtained when the content is less than 0.25%, but the effect is saturated when the content exceeds 0.60%, and the cost is high, and it should be controlled within the range of 0.2 to 0.6 wt%.
Ni0.5-2.5%: ni is an austenitizing stable element, can effectively reduce Ms point, and can improve the plasticity and low-temperature toughness of the material, but the price of Ni is high, and the content of Ni is controlled to be below 2.5 percent.
0.2-0.50% of Cu0.2%, and the strength of the steel is improved by separating out epsilon-Cu to realize precipitation strengthening.
0.05-0.50% of V, 0.02-0.20% of Ti0.02-0.20% of Nb0.02-0.20% of V, and plays a significant role in grain refinement, phase change behavior and C enrichment in austenite. The Nb in a solid solution state retards static and dynamic recrystallization and austenite-to-ferrite transformation during hot deformation, thereby expanding the temperature range between the dynamic recrystallization termination temperature and Ac3 and facilitating rolling in the non-recrystallized zone. Nb is combined with C and N to form fine carbonitride, so that recrystallization can be delayed, ferrite grains are prevented from growing, and the steel has a strong fine-grain strengthening effect and a strong precipitation strengthening effect.
Ti and V have a precipitation strengthening effect.
0.0005 to 0.005 percent of Ca0.0005 to 0.005 percent of Mg0.0005 to 0.005 percent of Ca and Mg can purify steel, modify inclusions and improve the comprehensive performance of the steel.
Controlling hot rolling coiling temperature to enable the tissue structure of the hot rolled steel plate to be a ferrite and bainite tissue, distributing fine dispersed carbide in the bainite tissue, carrying out cold rolling (the reduction rate is 30-70%), carrying out continuous annealing, controlling the continuous annealing process as follows, rapidly heating at the speed of not less than 20 ℃/s, immediately cooling to the bainite transformation temperature at the speed of not less than 40 ℃/s after reaching 800-930 ℃, carrying out bainite isothermal transformation, then adjusting the temperature to complete hot dip galvanizing, and cooling to room temperature. Considering the cold rolling capability, the reduction rate of 30-70% is selected, and the rapid heating and rapid cooling ensure that the crystal grains of the steel are fine in the austenitizing process, and the austenite does not realize complete homogenization, so that the uniformity and fineness of the bainite structure in the subsequent bainite transformation process can be ensured. The higher cooling rate ensures the formation of lath and granular bainite and residual austenite. The bainite region is isothermal, and simultaneously C atoms can be diffused into the residual austenite to stabilize the residual austenite, so that the steel plate has better toughness.
The invention has the beneficial effects that:
the invention provides a cold-rolled galvanized steel sheet with high strength and high hole expansion performance and a production method thereof. The production method has excellent economical efficiency and high efficiency. The tensile strength is more than or equal to 800MPa, the elongation after fracture (A50) is more than or equal to 28 percent, the lambda is more than or equal to 40 percent, and the high-toughness steel has good toughness.
Detailed Description
The chemical compositions of the steels of the specific examples are shown in Table 1, and the process treatment parameters and properties are shown in Table 2.
TABLE 1 chemical composition in wt% of steel sheet
TABLE 2 Process treatment parameters and Properties of the Steel sheets
Claims (2)
1. A high-strength high-hole-expansion-performance galvanized steel sheet is characterized by comprising the following chemical components in percentage by mass: 0.16 to 0.44 percent of C, 0.50 to 2.5 percent of Si, 1.10 to 4.00 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, 0.02 to 3.00 percent of Al, and at least one of 0.30 to 1.50 percent of Cr0.25 to 0.60 percent of Mos, 0.50 to 2.50 percent of Nis, 0.20 to 0.50 percent of Cu0.05 to 0.50 percent of V, 0.02 to 0.20 percent of Ti and 0.02 to 0.20 percent of Nb0.02 to 0.20 percent of chemical components; the steel plate also contains one or two of Ca0.0005% -0.005% and Mg0.0005% -0.005% in chemical components; the balance of Fe and some inevitable impurity elements; the steel plate structure comprises 55-85% of bainite and 15-45% of residual austenite, namely B + A, wherein the volume fraction of the bainite is lath-shaped and granular, and the residual austenite is distributed between the bainitics and inside the bainitics; the tensile strength is more than or equal to 800MPa, the elongation A50 after fracture is more than or equal to 28 percent, the lambda is more than or equal to 40, and the high-toughness steel has good toughness.
2. A method for manufacturing the galvanized steel sheet with high strength and high hole expansibility as claimed in claim 1, wherein the steel sheet is subjected to smelting, continuous casting, hot rolling, pickling and cold rolling, and then is subjected to recrystallization annealing hot galvanizing on a continuous hot galvanizing production line, wherein the hot rolling finishing temperature is not less than 800 ℃, the coiling temperature is 400-600 ℃, the organization structure of the hot rolled steel sheet is controlled to be ferrite and lower bainite, finely dispersed carbides are distributed in a bainite structure, the compression ratio of the cold rolling is 30-70%, the continuous hot galvanizing production line is not provided with a heat preservation section, and the heating section is selected to be subjected to rapid induction heating; the continuous annealing process was controlled as follows: rapidly heating to 800-930 ℃ at a speed of not less than 20 ℃/s, immediately cooling to bainite transformation temperature at a speed of not less than 40 ℃/s, adjusting the temperature of the strip steel to 450-480 ℃ after completing bainite isothermal transformation, carrying out hot dip galvanizing, controlling the bainite isothermal transformation time to be 15-150 s, controlling the components of a zinc liquid to be the zinc liquid containing 0.18-0.50% of Al and the balance of Zn and inevitable impurities, and then cooling to room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710064850.1A CN108396260B (en) | 2017-02-05 | 2017-02-05 | High-strength high-hole-expansion-performance galvanized steel sheet and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710064850.1A CN108396260B (en) | 2017-02-05 | 2017-02-05 | High-strength high-hole-expansion-performance galvanized steel sheet and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108396260A CN108396260A (en) | 2018-08-14 |
| CN108396260B true CN108396260B (en) | 2020-01-07 |
Family
ID=63093480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710064850.1A Active CN108396260B (en) | 2017-02-05 | 2017-02-05 | High-strength high-hole-expansion-performance galvanized steel sheet and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108396260B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110499465A (en) * | 2019-09-02 | 2019-11-26 | 鞍钢股份有限公司 | A kind of low-cost high-strength galvanized steel plain sheet and its manufacturing method |
| CN113832386A (en) * | 2020-06-23 | 2021-12-24 | 宝山钢铁股份有限公司 | High-strength hot-rolled substrate, hot-dip galvanized steel and manufacturing method thereof |
| CN111945075B (en) * | 2020-09-07 | 2021-11-12 | 鞍钢股份有限公司 | Alloying hot galvanizing DH590 steel with high hole expansion performance and preparation method thereof |
| CN111979488B (en) * | 2020-09-07 | 2021-11-16 | 鞍钢股份有限公司 | 780 MPa-grade alloying hot-dip galvanized DH steel and preparation method thereof |
| CN112048680B (en) * | 2020-09-07 | 2021-12-24 | 鞍钢股份有限公司 | Alloyed hot-dip galvanized DH980 steel and preparation method thereof |
| CN113403548B (en) * | 2021-05-21 | 2022-08-16 | 鞍钢股份有限公司 | 1470 MPa-grade high-hole-expansion steel plate for cold stamping and preparation method thereof |
| CN113528950B (en) * | 2021-06-22 | 2022-10-21 | 首钢集团有限公司 | Preparation method of hot-dip galvanized high-strength steel with good welding performance |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102325916A (en) * | 2008-12-24 | 2012-01-18 | Posco公司 | High-strength elongation steel sheet, hot-rolled steel sheet, cold-rolled steel sheet, zinc-coated steel sheet, and method for manufacturing alloyed zinc-coated steel sheet |
| CN103993243A (en) * | 2014-05-14 | 2014-08-20 | 东北大学 | Super-strength bainite steel plate and preparation method thereof |
| CN104204261A (en) * | 2012-03-30 | 2014-12-10 | 奥钢联钢铁有限责任公司 | High strength cold rolled steel sheet and method of producing such steel sheet |
| CN106119702A (en) * | 2016-06-21 | 2016-11-16 | 宝山钢铁股份有限公司 | A kind of 980MPa level hot-rolled high-strength height reaming steel and manufacture method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000256788A (en) * | 1999-03-10 | 2000-09-19 | Kobe Steel Ltd | Galvannealed steel sheet excellent in workability, and its manufacture |
-
2017
- 2017-02-05 CN CN201710064850.1A patent/CN108396260B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102325916A (en) * | 2008-12-24 | 2012-01-18 | Posco公司 | High-strength elongation steel sheet, hot-rolled steel sheet, cold-rolled steel sheet, zinc-coated steel sheet, and method for manufacturing alloyed zinc-coated steel sheet |
| CN104204261A (en) * | 2012-03-30 | 2014-12-10 | 奥钢联钢铁有限责任公司 | High strength cold rolled steel sheet and method of producing such steel sheet |
| CN103993243A (en) * | 2014-05-14 | 2014-08-20 | 东北大学 | Super-strength bainite steel plate and preparation method thereof |
| CN106119702A (en) * | 2016-06-21 | 2016-11-16 | 宝山钢铁股份有限公司 | A kind of 980MPa level hot-rolled high-strength height reaming steel and manufacture method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108396260A (en) | 2018-08-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108396260B (en) | High-strength high-hole-expansion-performance galvanized steel sheet and manufacturing method thereof | |
| CN108396237B (en) | High-plasticity cold-rolled sheet and production method thereof | |
| CN101487096B (en) | Low-alloy high-strength C-Mn-Al Q & P steel and method of manufacturing the same | |
| CN102409222B (en) | Continuously annealed or hot galvanized cold rolled transformation induced plasticity steel plate and preparation method thereof | |
| CN104561812B (en) | A kind of 1000MPa level high alumina hot dip galvanized dual phase steel and preparation method thereof | |
| CN106811678B (en) | A kind of quenching alloy galvanized steel plate and its manufacturing method | |
| CN111235470A (en) | 980MPa grade cold-rolled steel plate with high hole expanding rate and high elongation and manufacturing method thereof | |
| CN104928568A (en) | Ferrite low-density high-strength steel and manufacturing method thereof | |
| CN103882320B (en) | Stretch flangeability and the excellent high strength cold rolled steel plate of spot weldability and manufacture method thereof | |
| CN105803321A (en) | 980 MPa-level vanadium-contained ultrafine grain cold rolled dual-phase steel and preparing method thereof | |
| CN104498821B (en) | Medium-manganese high-strength steel for automobiles and production method thereof | |
| CN102699031B (en) | 900 MPa grade ultrahigh-toughness low alloy steel and manufacture method thereof | |
| CN103147000B (en) | Polygonal ferrite-acicular ferrite two-phase steel plate/belt and production method thereof | |
| CN109628840B (en) | 550 MPa-grade cold-rolled corrosion-resistant dual-phase steel and manufacturing method thereof | |
| CN113502382B (en) | Preparation method of 980 MPa-grade ultrahigh-ductility cold-rolled high-strength steel | |
| CN103422025A (en) | Steel for low-yield-ratio structure with yield strength larger than or equal to 690MPa and production method of steel | |
| CN109957714B (en) | Steel for pipeline excellent in strength and low-temperature toughness and method for producing same | |
| CN112430787B (en) | Low-yield-ratio high-strength cold-rolled hot-dip galvanized steel plate and manufacturing method thereof | |
| CN102605287A (en) | Steel for high-ductility anti-seismic structure with yield ratio smaller than or equal to 0.70 and production method of steel | |
| CN113930670B (en) | Low-cost NM400 hot-rolled wear-resistant steel plate and production method thereof | |
| CN102712978A (en) | High-strength hot-dip galvanized steel sheet with excellent processability and spot weldability and process for producing same | |
| CN103422021A (en) | Low-yield-ratio structural steel with yield ratio equal to or larger than 550MPa and manufacturing method thereof | |
| CN104928456A (en) | Manufacturing method for improving extensibility of commonly-cooled ferrite lightweight steel | |
| CN109161793A (en) | A kind of low yield strength ratio high-strength weathering steel and its production method | |
| CN112760554A (en) | High-strength steel with excellent ductility and manufacturing method thereof |
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 |