CN109371325A - A kind of electrogalvanized thermoforming steel plate that cold-bending property is excellent or steel band and its manufacturing method - Google Patents

A kind of electrogalvanized thermoforming steel plate that cold-bending property is excellent or steel band and its manufacturing method Download PDF

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Publication number
CN109371325A
CN109371325A CN201811454798.1A CN201811454798A CN109371325A CN 109371325 A CN109371325 A CN 109371325A CN 201811454798 A CN201811454798 A CN 201811454798A CN 109371325 A CN109371325 A CN 109371325A
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steel plate
cold
steel band
electrogalvanized
thermoforming
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毕文珍
洪继要
王利
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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Priority to CN201811454798.1A priority Critical patent/CN109371325A/en
Publication of CN109371325A publication Critical patent/CN109371325A/en
Priority to PCT/CN2019/121860 priority patent/WO2020108594A1/en
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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
    • C22C38/02—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
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • 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

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  • 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)
  • Chemical Kinetics & Catalysis (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

It in 20um substrate below and thereon adhesion amount is 10~100g/m that a kind of electrogalvanized thermoforming steel plate that cold-bending property is excellent or steel band and its manufacturing method, the electrogalvanized thermoforming steel plate or steel band, which include surface-carburized layer thickness,2Zinc system coating；The composition by weight percent of the substrate are as follows: C:0.1~0.8%, Si:0.05~2.0%, Mn:0.5~3.0%, P≤0.1%, S≤0.05%, Al≤0.1%, N≤0.01%, remaining Fe and inevitable impurity；The original austenite grains average-size of the substrate is in 15um or less.Thermoforming steel plate or steel band the tensile strength 1500MPa after meeting substrate thermoforming of the present invention, on the basis of elongation after fracture 5%, coating is continuous whole, without the crackle for extending to substrate, and steel plate cold bending function admirable.

Description

A kind of electrogalvanized thermoforming steel plate that cold-bending property is excellent or steel band and its manufacture Method
Technical field
The present invention relates to metal material field, in particular to a kind of electrogalvanized thermoforming steel plate that cold-bending property is excellent or Steel band and its manufacturing method are mainly used in the structural members components such as manufacture automobile B-column, door anti-collision joist, bumper.
Background technique
Automobile light weight, safety, the development trend of low energy consumption promote the development of high-strength steel sheet.Using advanced super-high strength steel Substituting traditional low-intensity steel plate becomes inevitable, and the use of high-strength steel sheet can also significantly improve the crashworthiness of automobile. But with the raising of armor plate strength, the difficulty of part processing is also continuously increased.For process for stamping and forming, be thinned is with high-strength The double factor for deteriorating formability not only makes bodywork parts be easy cracking in forming process, but also is easy to produce excessive return Bullet influences the subsequent assembly of vehicle body.The high intensity that final part is realized by way of heat treatment is one such approach, and Hot press-formed technology be it is a kind of realize part high intensity by way of being heat-treated and hot forming combines, can be preferable Solve the high-intensitive contradictory problems with cold forming.But with the extensive application of drop stamping steel, thereupon to material drop stamping after The collision performance of part, if the requirement of cold-bending property and impact flexibility also correspondinglys increase, and traditional drop stamping steel is not able to satisfy Demand.
In addition, stamping steel plate surface oxidation peeling, oxide skin can be caused in traditional no coating heat-punch member heating process It then increases the coefficient of friction of steel plate and mold, reduce the service life of mold, simultaneous oxidation skin results in the need for timing and clears up mould Tool, greatly reduces production efficiency.For the subsequent processing requirement for meeting stamping parts, need to remove the oxygen of Surface Creation by shot-peening Change skin, blasting process makes stamping parts surface generate fine crack, limits production and application.To avoid drop stamping surface of steel plate Oxidation and decarburization make drop stamping steel plate have heat-resisting quantity and corrosion resistance, have developed be suitable for drop stamping steel coating at present Technology.Drop stamping steel coating mainly has Al-Si coating, GI coating, GA coating and Zn-Ni coating etc. at present.Heat punching with coating Laminated steel, working environment is good when punching press, and surface quality of workpieces is high, subsequent to be not necessarily to blasting process, can not only prevent forming process Middle surface oxidation and decarburization, moreover it is possible to the Corrosion Protection after improving paint dress.
Summary of the invention
The purpose of the present invention is to provide a kind of electrogalvanized thermoforming steel plate that cold-bending property is excellent or steel band and its systems Method is made, the tensile strength of the electrogalvanized thermoforming steel plate is greater than 1400MPa, and elongation after fracture is greater than 5%, main application In structural members components such as manufacture automobile B-column, door anti-collision joist, bumpers.
In order to achieve the above objectives, the technical scheme is that
The intensity and elongation percentage of drop stamping steel plate can not characterize the collision performance of part completely, and cold-bending property is then table The important feature of collision performance is levied, because extreme plastic deformation is generated in drop stamping part in collision, to make drop stamping The surface of part be subjected to it is serious be badly deformed, cold-bending property is especially heavy in the material especially more than tensile strength 980MPa It wants.The present invention has found after relevant research, adds a small amount of Nb element in conventional drop stamping steel plate, can be to the original of steel plate Beginning austenite grain and final martensitic structure are refined, and the cold-bending property of material is correspondingly improved.Meanwhile research is found Dew point is improved in steel plate annealing, it can be in the decarburized layer of galvanized sheet substrate surface generation certain depth, due to iron element in decarburized layer Body content is high, equally beneficial to the cold-bending property of material.
Specifically, electrogalvanized thermoforming steel plate or steel band that a kind of cold-bending property of the invention is excellent, the zinc system plating It covers thermoforming steel plate or steel band include surface-carburized layer thickness in 20um substrate below and thereon adhesion amount is 10~100g/m2 Zinc system coating；The composition by weight percent of the substrate are as follows: C:0.1~0.8%, Si:0.05~2.0%, Mn:0.5~ 3.0%, P≤0.1%, S≤0.05%, Al≤0.1%, N≤0.01%, remaining Fe and inevitable impurity；The substrate Original austenite grains average-size is in 15um or less.
Preferably, zinc system coating is pure zinc coating or the zn-fe alloy coating containing 10%~20% iron.
Preferably, the substrate ingredient also contains Cr:0.01~1.0%, Mo:0.01~1.0%, Ti≤0.2%, Nb: 0.01~0.08%, at least one of V:0.01~1.0%, B:0.001~0.08%.
Preferably, the original austenite grains average-size of the substrate is in 15um or less.
In the ingredient design of steel of the present invention:
1, the chemical composition of substrate
C:0.10~0.8%
Carbon content is to determine that the main factor of the mechanical properties such as armor plate strength, hardness, intensity, the hardness of steel increase And improve, plasticity, toughness decrease, and cold short tendentiousness and timeliness tendentiousness also increase accordingly.Carbon content also quenches steel Mechanical property has a significant impact afterwards, and reason is that the hardness level of martensitic structure after quenching depends primarily on phosphorus content therein Just.Make the tensile strength of drop stamping part in 1000MPa or more, it is necessary to make C content 0.10% or more.On the other hand, C When content is more than 0.8%, the toughness deterioration of quenched member is significant.Therefore C content be set as 0.8% hereinafter, preferably 0.5% with Under.
Si:0.05~2.0%
Si is displacement solid solution alloy element, it can promote enrichment of the C in austenite, so that stabilization of austenite increases Add, improve the intensity of steel, and improves its toughness to a certain extent.But Si content is when being more than 2.0%, when hot rolling, generates red The probability of the surface defect of color iron scale increases, and roll-force increases, and the ductility of hot rolled steel plate is caused to deteriorate.Therefore, Si Content should be less than 2.0%.
Mn:0.5~3.0%
Mn is the very effective element of intensity after improving the harden ability of steel plate and steadily ensuring to quench.Mn makees simultaneously For the element for expanding austenite phase field, Ac3 and Ac1 point temperature can be reduced, delays pearlitic transformation, adds to reduce drop stamping Hot temperature.In addition, Mn can be diffused into plating overlay film in heating process before hot forming, the oxidation of Mn is formed in coating surface Object, so that zinc oxide layer is inhibited to be excessively generated, it is advantageous to spot welding characteristics after hot forming.When Mn content is less than 0.5%, effect is not Sufficiently.On the other hand, when Mn content is more than 3%, segregation can be generated, is caused under substrate steel plate and drop stamping part performance uniformity Drop.
Al:0.005~1.0%
Al has the function of steel-deoxidizing.When Sol.Al content is less than 0.005%, it is difficult to obtain the effect based on above-mentioned effect Fruit, therefore, Sol.Al content are set as 0.005% or more.On the other hand, when Sol.Al content is more than 1.0%, above-mentioned effect Effect saturation, and it is unfavorable in cost.Therefore, Sol.Al content is set as 1.0% or less.
N:0.01% or less
When N content is more than 0.01%, the nitride of AlN will form in hot rolling, lead to the punch press process of substrate steel plate It can be reduced with harden ability.
Nb:0.01~0.08%
Nb is microalloy element important in steel, and micro Nb is added in steel can guarantee the steel situation lower in carbon equivalent Under, by the solid solution of its carbon, the disperse educt and Nb of nitride particle (size is less than 5nm), crystal grain is refined, steel is greatlyd improve Intensity, toughness, especially low-temperature flexibility, while making steel that there is good cold-bending property and solderability.Preferred Nb in the present invention Content can effectively refine the original austenite grains of steel substrate 0.02~0.05%, it is therefore intended that improve part after hot forming Cold-bending property.
B:0.005~0.08%
B is the element that crystal boundary segregation is strong in steel, can reduce the crystal boundary energy of austenite, inhibits pro-eutectoid ferrite nucleus It is formed, the harden ability effect for improving steel has the characteristics that three is big: improving the very capable of harden ability, has document to point out 0.001%~0.003% B effect can be respectively equivalent to 0.6% Mn, 0.7% Cr, 0.5% Mo and 1.5% Ni, Only need minimal amount of B that can save a large amount of expensive alloying elements；B is improved the optimum content of harden ability, is different from general close With it, the content in steel increases and increases the effect of gold element raising harden ability, and B has an optimum content range, and content is very micro- It is small.The control of preferred B content is excessive or very few unfavorable to harden ability is improved 0.001%~0.004% in the present invention.
It in the present invention,, can be further in prescribed limit on the basis of above-mentioned neccessary composition in substrate steel plate Contain optional member below.It should be noted that different from neccessary composition, can also without containing it is described below optionally at Point: Ti:0~0.20%, V:0~1.0%, W:0~1.0%, Cr:0~1.0%, Mo:0~1.0%.
2, Zn system's coating
In the present invention, for the generation of inhibition oxide skin when the heating before hot forming, it is arranged in surface of steel plate and adheres to Amount is 10g/m2Zn system coating.Here, the adhesion amount (each single side of steel plate) of coating is 10~90g/m2, less than 10~ 90g/m2When, it is unable to give full play the sacrificial anode anticorrosion ability of Zn, more than 90g/m2, effect saturation, and cause in cost It rises.
It can also be in addition to pure Zn coating (such as the coating formed with hot galvanizing line, electrogalvanizing line) as Zn system coating Zn-Fe alloy coating (coating for implementing Alloying Treatment with hot galvanizing line), Zn-Ni alloy coating, zn-al alloy coating, Zn-Mg alloy layer, Zn-Al-Mg alloy layer etc..Further, it is also possible to be dispersed in using metal oxide, polymer etc. this The Zn system composite deposite formed in Zn system coating is also possible to the coating for forming the multiple stackings of this Zn system coating.
3, the tissue of substrate steel plate
The internal oxidation layer of steel plate surface layer of the invention there are thickness at 1~5 μm, the internal oxidation layer contain oxide particle, The oxide particle is one or more, the steel plate surface layer one of the present invention among Si oxide and Si, Mn composite oxides The internal oxidation layer for determining thickness is characterized in required, has with Si, Mn content in steel plate and the dew point in annealing immersion processes Inevitable connection.Due to being added to Nb element in steel plate in the present invention, original austenite grains, crystal grain have effectively been refined Size is in 15um or less.
The manufacturing method of the excellent electrogalvanized thermoforming steel plate of cold-bending property of the present invention or steel band comprising such as Lower step:
1) it is smelted by above-mentioned ingredient, continuous casting slab；
2) hot rolling: controlled rolling after slab is heated to 1100~1250 DEG C, start rolling temperature are 950~1150 DEG C, finish to gauge Temperature is 750~900 DEG C, and hot rolling plate thickness is less than or equal to 20mm；
3) it is batched after rolling at 500~850 DEG C, tissue is ferrite and pearlite tissue after being cooled to room temperature；
4) pickling is to remove the iron scale generated in course of hot rolling；
5) coil of strip cold rolling: is cold-rolled to 2.0mm thickness below, cold roling reduction >=35%；
6) it anneals and zinc-plated: coil of strip being heated to 650-850 DEG C in -40~30 DEG C of dew point, is plating coil of strip With the decarburized layer of 20um before zinc, then in the H of 1~30 percentage by volume %2In range, with the cooling velocity of 10~30 DEG C/s 400~500 DEG C are cooled to, 0~100s is kept the temperature, subsequent immersion plating is into plating solution, and bath temperature is 440~480 DEG C, finally with >=30 DEG C/s cooling velocity is cooled to room temperature；
If 7) coating is galvanneal coating, after galvanizing by dipping processing, reheated with steam stove, induction heater etc. It carries out, alloying temperature is set as 480 DEG C or more, preferably 500~650 DEG C.
Preferably, cold roling reduction described in the step 5) is 50~60%.
Preferably, in the step 6), coil of strip is heated to 500-800 DEG C in 0~10 DEG C of dew point.
Further, the invention also includes following heat stamping and shaping steps:
1) it heats: steel plate or steel band is put into the heating furnace of continuous annealing, with the heating speed greater than 5 DEG C/s by steel plate Or steel band is heated to above Ac3Temperature, soaking time 1-10 minutes, keep steel plate or steel band austenitizing uniform；
2) it is quenched in heat stamping and shaping and mould: the steel plate of complete austenitizing is moved to punch forming on hot stamping die Quenching, forming temperature scope be lower than 780 DEG C, preferably 400~650 DEG C, the heat stamping and shaping dwell time 3~15 seconds, stamping press It is 300~1000 tons；After the completion of heat stamping and shaping, steel plate or steel band cool down in a mold, and in a mold, or take out from mold After be cooled to room temperature, complete martensitic traoformation.
Preferably, in heat stamping and shaping step, steel plate or steel band are pre-chilled before punch forming, precool speed be greater than 30 DEG C/ s。
Preferably, in step 2) described in heat stamping and shaping step, steel plate or steel band are pre-chilled before punch forming, precools Speed is greater than 30 DEG C/s.
Preferably, step 2) light plate described in heat stamping and shaping step or steel band are cooled down in a mold to be greater than 30 DEG C/cooling velocity of s is cooled to room temperature.
In the manufacturing method of thermoforming steel plate of the present invention or steel band
The substrate, which is smelted, can also use electric furnace or induction furnace using converter.
If coating is galvanneal coating, after galvanizing by dipping processing, reheated with steam stove or induction heater etc. It carries out, metal diffusion is carried out between coating layer and substrate steel plate, plating overlay film carries out alloying (zn-fe alloy is formed). In order to improve the Fe content (%) in coating layer, alloying temperature is set as 480 DEG C or more.When less than 480 DEG C, alloying speed Degree is slow, therefore production efficiency reduces, and alloying temperature is higher, and alloying speed is faster, in Ac1Or more when, steel plate can be made strong Degree reduces, therefore alloying temperature preferred scope is 500~650 DEG C.
In the heat stamping and shaping step of drop stamping components:
Based on it is of the invention the study found that formative stage must avoid as far as possible fusing zinc contacted with austenite, because This, it is necessary to heat stamping and shaping is carried out in the temperature lower than coating fusing point after drop stamping.In order to still guarantee steel plate in these cases Energy quench hardening, can be by adding boron element, and delay austenite improves the harden ability of steel plate or steel band to martensitic transformation.This Detailed process is as follows for the heat stamping and shaping technique of invention:
(1) heat: the steel plate or steel band that coat zinc or zinc-iron alloy are put into temperature >=Ac3, and (austenitizing transformation terminates Temperature) vertical continuous annealing heating furnace in, steel plate or steel band to be heated to above not less than the heating speed of 5 DEG C/s Ac3Temperature, keep the temperature 1-3 minutes, keep steel plate or steel band austenitizing uniform；
(2) quenching in heat stamping and shaping and mould: by after blanking steel plate or steel band move quickly on hot stamping die and rush Molded quenching, forming temperature scope are that preferably 400~650 DEG C of the present invention, can increase before punch forming lower than 780 DEG C Pre-cooling.The heat stamping and shaping dwell time about 3~15 seconds, stamping press was 300~1000 tons.After the completion of heat stamping and shaping, steel plate or Steel band cools down in a mold, and in a mold, or is cooled to room temperature after mold taking-up, completes martensitic traoformation.
Method of the invention can be by traditional band coating drop stamping steel 22MnB5 before drop stamping as seen from Figure 1 Contain decarburized layer afterwards, and its original austenite grains refines obvious (Fig. 3 and Fig. 4) than traditional drop stamping steel plate, therefore this hair Drop stamping part cold-bending property in bright greatly improves (Fig. 5).Drop stamping technique of the present invention can also avoid zinc-base from plating Since (Liquid Metal Embrittlement, marks liquid metal embrittlement below after the drop stamping steel plate punched molding of layer For matrix cracking caused by LME), it is of great significance to the development of zinc-base drop stamping steel.
Beneficial effects of the present invention:
The drop stamping part that the present invention obtains, cold-bending property is better than traditional drop stamping part, to drop stamping steel Development is of great significance.
Detailed description of the invention
Fig. 1 is the section metallographic of thermoforming steel plate of the present invention (after hot forming)；
Fig. 2 is thermoforming steel plate of the present invention section internal oxidation layer metallographic (before hot forming)；
Fig. 3 is example thermoforming steel plate original austenite grains picture of the present invention；
Fig. 4 is comparative example thermoforming steel plate original austenite grains picture；
Fig. 5 is clod wash angle contrast figure after steel plate of the present invention and the thermoforming of comparative example steel plate.
Specific embodiment
Below with reference to embodiment and attached drawing, the present invention will be further described.
The embodiment of the present invention is referring to table 1 and table 2.
Melting has simultaneously cast the steel plate 1-6 with chemical component shown in table 1.These steel plates are heated to 1230 DEG C of controls to roll System, finishing temperature are 900 DEG C, the hot rolled steel plate of thickness about 3mm are then obtained under 600 DEG C of coiling temperatures, by the hot rolled steel plate Thickness 1.4mm is cold-rolled to after pickling rolls hardboard.
Roll hardboard recrystallization annealing and hot galvanizing for above-mentioned according to the 1-6 condition of table 2, obtain galvanized steel plain sheet, then by these After steel plate keeps the temperature 4 minutes at 930 DEG C, according still further to the forming technology in table 2, send and be shaped to B column part into mold.
From comparative example and the embodiment result of table 1 as it can be seen that being not added with Nb element, original austenite grains in comparative example 6 Visible crystallite dimension is more obvious than embodiment (Fig. 3) coarse in (Fig. 4).The embodiment and comparative example result of contrast table 2 is as it can be seen that even In continuous hot galvanizing process, if the dew point in heating furnace is too low (such as comparative example 6), the practical decarburized depth of substrate is 0um, from Fig. 5 As a result its visible cold-bending property is more obvious than embodiment poor.Comparative example and embodiment result in contrast table 3 is visible in conventional heat punching Under the conditions of pressure, when steel plate, which is transferred out of heating furnace, to be transferred in mold, such as do not apply pre-cooling, it is (such as right to crack in part Ratio 6).Therefore, there is good service performance according to the steel plate and drop stamping technique of the method for the present invention production.

Claims (10)

1. a kind of electrogalvanized thermoforming steel plate or steel band that cold-bending property is excellent, which is characterized in that the electrogalvanized heat at It is 10~100g/m that shape steel plate or steel band, which include surface-carburized layer thickness in 20um substrate below and thereon adhesion amount,2Zinc system Coating；The composition by weight percent of the substrate are as follows: C:0.1~0.8%, Si:0.05~2.0%, Mn:0.5~3.0%, P≤ 0.1%, S≤0.05%, Al≤0.1%, N≤0.01%, remaining Fe and inevitable impurity；The original austenite of the substrate Average grain size is in 15um or less.
2. cold-bending property according to claim 1 excellent electrogalvanized thermoforming steel plate or steel band, which is characterized in that institute Stating zinc system coating is pure zinc coating or the zn-fe alloy coating containing 10%~20%Fe.
3. the excellent electrogalvanized thermoforming steel plate of cold-bending property according to claim 1 or 2 or steel band, feature exist In, the substrate ingredient also contain Cr:0.01~1.0%, Mo:0.01~1.0%, Ti≤0.2%, Nb:0.01~0.08%, At least one of V:0.01~1.0%, B:0.001~0.08%.
4. cold-bending property described according to claim 1~any one of 3 excellent electrogalvanized thermoforming steel plate or steel band Manufacturing method, it is characterized in that: including the following steps:
1) ingredient smelting according to claim 1, continuous casting slab；
2) hot rolling: controlled rolling after slab is heated to 1100~1250 DEG C, start rolling temperature are 950~1150 DEG C, finishing temperature It is 750~900 DEG C, hot rolling plate thickness is less than or equal to 20mm；
3) it is batched after rolling at 500~850 DEG C, tissue is ferrite and pearlite tissue after being cooled to room temperature；
4) pickling is to remove the iron scale generated in course of hot rolling；
5) coil of strip cold rolling: is cold-rolled to 2.0mm thickness below, cold roling reduction >=35%；
6) it anneals and zinc-plated: coil of strip being heated to 650-850 DEG C in -40~30 DEG C of dew point, makes coil of strip before zinc-plated Decarburized layer with 20um, then in the H of 1~30 percentage by volume %2It is cooling with the cooling velocity of 10~30 DEG C/s in range To 400~500 DEG C, 0~100s is kept the temperature, subsequent immersion plating is into plating solution, and bath temperature is 440~480 DEG C, finally with >=30 DEG C/s Cooling velocity is cooled to room temperature；
If 7) coating be galvanneal coating, galvanizing by dipping processing after, with steam stove or induction heater reheated come into Row, alloying temperature are set as 480 DEG C or more, preferably 500~650 DEG C.
5. the manufacturing method of the excellent electrogalvanized thermoforming steel plate of cold-bending property according to claim 4 or steel band, It is characterized in: further includes following heat stamping and shaping step:
1) it heats: steel plate or steel band is put into the heating furnace of continuous annealing, with the heating speed greater than 5 DEG C/s by steel plate or steel Band is heated to above Ac3Temperature, soaking time 1-10 minutes, keep steel plate or steel band austenitizing uniform；
2) it is quenched in heat stamping and shaping and mould: the steel plate of complete austenitizing or steel band being moved on hot stamping die and struck out Type quenching, forming temperature scope be lower than 780 DEG C, preferably 400~650 DEG C, the heat stamping and shaping dwell time 3~15 seconds, punching press Power is 300~1000 tons；After the completion of heat stamping and shaping, steel plate or steel band cool down in a mold, and take in a mold or from mold It is cooled to room temperature after out, completes martensitic traoformation.
6. the manufacturing method of the excellent electrogalvanized thermoforming steel plate of cold-bending property according to claim 5 or steel band, It is characterized in: in the step 2), steel plate or steel band is pre-chilled before punch forming, precools speed and be greater than 30 DEG C/s.
7. the manufacturing method of the excellent electrogalvanized thermoforming steel plate of cold-bending property according to claim 5 or steel band, Be characterized in: the step 2) light plate or steel band are cooled to room temperature in a mold with the cooling velocity greater than 30 DEG C/s.
8. the manufacturing method of the excellent electrogalvanized thermoforming steel plate of cold-bending property according to claim 4 or steel band, Be characterized in: cold roling reduction described in the step 5) is 50~60%.
9. the manufacturing method of the excellent electrogalvanized thermoforming steel plate of cold-bending property according to claim 4 or steel band, Be characterized in: in the step 6), coil of strip is heated to 500-800 DEG C in 0~10 DEG C of dew point.
10. the manufacturing method of the excellent electrogalvanized thermoforming steel plate of cold-bending property according to claim 5 or steel band, Be characterized in: the tensile strength of the electrogalvanized thermoforming steel plate or steel band is greater than 1400MPa, and elongation after fracture is greater than 5%.
CN201811454798.1A 2018-11-30 2018-11-30 A kind of electrogalvanized thermoforming steel plate that cold-bending property is excellent or steel band and its manufacturing method Pending CN109371325A (en)

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PCT/CN2019/121860 WO2020108594A1 (en) 2018-11-30 2019-11-29 Zinc-based plated hot-formed steel plate or steel strip having excellent cold bending performance, and manufacturing method thereof

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