CN105401071B - A kind of 500MPa levels car Galvanized Dual Phase Steel and production method - Google Patents

A kind of 500MPa levels car Galvanized Dual Phase Steel and production method Download PDF

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CN105401071B
CN105401071B CN201510968625.1A CN201510968625A CN105401071B CN 105401071 B CN105401071 B CN 105401071B CN 201510968625 A CN201510968625 A CN 201510968625A CN 105401071 B CN105401071 B CN 105401071B
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temperature
finishing
pickling
cold rolling
dual phase
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CN105401071A (en
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林承江
潘利波
王辉
刘祥东
张道良
刘安哲
陈迟辉
李金�
周文强
刘亮
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Wuhan Iron and Steel Co Ltd
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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
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • 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
    • C22C38/12—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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • 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
    • C21D2211/005—Ferrite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

A kind of 500MPa levels car Galvanized Dual Phase Steel, its component and wt% are：C：0.04~0.09%, Si：≤ 0.01%, Mn：1.0~2.0%, P：≤ 0.015%, S：≤ 0.010%, Als：0.01~0.08%, Mo 0.01 ~ 0.30% or Cr 0.02 ~ 0.9%, Nb：0.001 ~ 0.03%, N：≤ 0.005%；Production stage：Through smelt, refine and continuous casting after to heating strand；Finish rolling；Batch；Cold rolling after pickling；Galvanizing；Finishing.Product mechanical property of the present invention reaches：295~365MPa of yield strength, 515~558MPa of tensile strength, elongation percentage 25 ~ 30%, n values 0.165 ~ 0.18；Product platability is good, coating surface uniform color zero defect, and inhibition layer is continuously fine and close, and Zinc attachability reaches ball and rushes 1 grade of level, and zinc layers and base steel bend test are qualified, and intermediate car can be met to high strength structure part and the surface quality requirements of outer covering piece.

Description

A kind of 500MPa levels car Galvanized Dual Phase Steel and production method
Technical field
The present invention relates to a kind of automobile using galvanized steel and method, specifically belongs to a kind of zinc-plated two-phase of 500MPa levels car Steel and production method.
Background technology
With the continuous improvement that the continuous development of automotive light weight technology and occupant safety require, high-strength steel is in automobile in recent years Ratio and dosage in white body quickly increase, and dual phase steel is more next because it has high intensity, low yield strength ratio and good formability More favored by auto industry circle, application percentage is improving constantly on automobile.Compared with cold-rolled biphase steel, Galvanized Dual Phase Steel Also there is excellent antiseptic property, can guarantee that automobile has good corrosion resistant piercing capability, be mainly used at present middle-and-high-ranking The structural member and reinforcer of car, great surface quality Galvanized Dual Phase Steel apply also for Car panel.Great surface quality is zinc-plated Dual phase steel is on the premise of mechanical property is ensured, the surface quality such as substrate platability, surface defect level, Zinc attachability rank Index also has higher requirement.At present, in the actual production of great surface quality Galvanized Dual Phase Steel, due to Si members in composition design Cellulose content is higher, Partial key technique does not carry out the reasons such as strict control, plating leakage, exceeded, the zinc layers bending dezincification of surface defect etc. Problem occurs often.
Through retrieval, Chinese Patent Application No. is 201410536158.0 document, and it discloses " 500MPa level cold rolling two-phases Steel and its production method ", a kind of 500MPa levels cold-rolled biphase steel is born using C-Si-Mn-B component systems, due to Si Element in annealing process easily in surface enrichment, thus be not suitable for produce great surface quality Galvanized Dual Phase Steel.
The content of the invention
The present invention exists in view of the deficienciess of the prior art, providing a kind of yield strength in 295~365MPa, tensile strength 515~558MPa, elongation percentage 25 ~ 30%, n values be 0.165 ~ 0.18, platability is good, coating surface uniform color zero defect and The excellent car Galvanized Dual Phase Steel of Zinc attachability and production method.
Realize the measure of above-mentioned purpose：
A kind of 500MPa levels car Galvanized Dual Phase Steel, its component and weight percent content are：C：0.04~0.09%, Si：≤ 0.01%, Mn：1.0~2.0%, P：≤ 0.015%, S：≤ 0.010%, Als：0.01~0.08%, Mo 0.01 ~ 0.30% or Cr 0.02 ~ 0.9%, Nb：0.001 ~ 0.03%, N：≤ 0.005%, remaining is iron and other inevitable impurity；Gold Phase constitution is：Ferrite and martensite.
It is：Mo and the compound additions of Cr, wherein Cr addition substitute 0.1%Mo meters according to 0.2 ~ 0.3%Cr, and control Cr+Mo≤1.0% processed.
Produce a kind of method of 500MPa levels car Galvanized Dual Phase Steel, its step：
1）Strand is heated after smelting, refining and be casting continuously to form strand by set composition, heating-up temperature 1200 ~ 1260℃；
2）Finish rolling is carried out, controls its finishing temperature at 880~920 DEG C；
3）Batched：Oiler temperature control is at 570~610 DEG C；
4）Cold rolling is carried out after pickling：Pickling temperature is controlled at 70~90 DEG C, and the acid number in sour pond is not less than 40g/l；Control Cold rolling total reduction is 45~75%；And control surface of steel plate reflectivity≤60%；
5）Carry out galvanizing：In the case where ensuring to enter annealing furnace front spring clean surface, annealed, control annealing temperature exists 770~830 DEG C, dew point control is below -40 DEG C in annealing furnace, oxygen content≤3ppm；Zinc liquid temperature is controlled 455~465 DEG C, aluminium content control is in 0.18~0.23%, Fe%≤0.009% in zinc liquid；
6）Carry out finishing：Finishing elongation control is 0.6~1.0%.
The effect of each element in the present invention
C：Carbon in dual phase steel significantly affects all phase transition process no longer based on solution strengthening, and controls Final microstructure and mechanical property, to ensure to separate out finished product mechanical property favourable larger ferrite the shape of area and martensitic phase Looks and hardness, carbon content can not be too high；Meanwhile carbon content has significant impact to galvanizing in steel, phosphorus content is higher, iron-zinc Reaction is more violent, and the weight loss of iron is bigger, while fe-zn alloy layer is thicker so that zinc coat adhesiveness degenerates and easily made There is list edge defect into zinc surface；Other carbon content also has a great impact to welding performance, although after being welded vehicle stiffness The intensity of steel used is heavily dependent on, but due to being connected mostly using solder joint between part and part, thus weld The intensity of point is also the important indicator of complete automobile collision security, and for consideration in this respect, many automobile factorys are intended to dual phase steel Carbon content control within 0.1%.In summary consider, carbon content range set of the present invention is 0.04~0.09%.
Si：For hot dip galvanized dual phase steel, Si elements easily form SiO in annealing in belt steel surface enrichment oxidation2 Oxide-film, it is difficult to by hydrogen reducing, so as to reduce zinc-plated wellability, plating leakage, pin hole, Zinc attachability is caused the coating such as not to conform to Defect, while Si elements also have harmful effect to the spot welding characteristics of galvanized sheet, therefore in order to reduce silicon to greatest extent to surface The influence of quality, application claims control Si constituent contents within 0.01%.
Mn：Mn is typical austenite stabilizer element, can postpone pearlite and bayesian as the element for expanding γ phase regions The formation of body, the quenching degree of steel is improved, promote to form martensite in rapid cooling cooling procedure, and play solution strengthening and refinement iron element The effect of body crystal grain, but Mn can be oxidized and deposit in steel strip surface in annealing process, and excessive Mn will deteriorate zinc-plated infiltration Property, therefore the present invention controls Mn contents in the range of 1.0 ~ 2.0%.
P、S：S, P is impurity element, and P is prone to be segregated, and makes dual phase steel that phase boundary embrittlement occur, causes brittle fracture, S Welding performance is adversely affected, while forms field trash to reduce the fatigue behaviour of steel, therefore application claims P≤ 0.015%, S≤0.010%.
Als：Aluminium adds for deoxidation, when Als contents are less than 0.010%, it is impossible to play its effect；The opposing party Face, because the aluminium for adding volume easily forms aluminum oxide agglomerate, so, it is specified that the Als upper limits are 0.08%.
Mo、Cr：Addition Mo, Cr can be such that CCT curve substantially moves to right, and strong inhibition pearlite and bainite transformation, be advantageous to Martensitic structure is obtained in Continuous Hot Dip Galvanizing Line.But the price of Mo alloys is costly, to reduce cost, it is also possible to Cr To replace part Mo, 0.1%Mo can be substituted with 0.2 ~ 0.3%Cr in general；Further, since the generation of Cr, Mo oxide Gibbs free energy is higher than the oxides such as Mn, Si, P, so surface oxidation is not susceptible to when galvanizing is annealed, also without table Face segregation phenomena, therefore the wellability of zinc liquid is not interfered with, but it must is fulfilled for the condition of Cr+Mo≤1.0%.
Nb：Nb plays remarkable effect to C enrichments in crystal grain refinement, transformation behavior, austenite.The Nb delayed heats of solid solution condition Static and dynamic recrystallization and austenite are to ferritic phase transformation in deformation process, so as to expand between recrystallization temperature and Ac3 Temperature range, be Unhydrated cement final rolling temperature determine provide convenience.Nb also promotees while fining ferrite grains Enter the refinement of martensitic phase and be uniformly distributed, be greatly enhanced the performance uniformity of steel, but the Nb of excessive addition can cause iron Nb carbonitride is separated out in ferritic, significantly improves the yield strength of finished product, it is unnecessary to stamping unfavorable and increase into This, therefore application claims control Nb content in the range of 0.001 ~ 0.03%.
N：N is more few better in steel, therefore requires N≤0.005%
In the technique of the present invention,
Why slab heating temperature is controlled at 1200 ~ 1260 DEG C, its reason can be ensured in this temperature range All alloying elements are dissolved, and ensure the control of follow-up final rolling temperature；
Why final rolling temperature is controlled at 880~920 DEG C, its reason is that finishing temperature is less than less than 880 DEG C, hot rolling temperature Degree somewhat fluctuation is possible to enter two-phase section rolling, easily produces mixed grain structure, and this uneven brilliant tissue has heredity Property, also it is not easy to eliminate even if by cold rolling and annealing, the inhomogeneities of tissue is except can produce the uniformity of mechanical property Outside influenceing, the uniformity of galvanizing surface can also be had an impact；
Why by oiler temperature control at 570~610 DEG C, its reason is that hot rolling coiling temperature is too high, easily causes heat Roll substrate coarse grains and banded structure occur, the uniformity of hot-rolled substrate tissue can be effectively improved by reducing coiling temperature, Make the crystal grain of hot-rolled substrate fine and smooth uniformly, so as to improve hot rolling banded structure, and then reduce cold rolling recrystallization crystal particle dimension so that Cold rolled annealed tissue is more uniform.
Why pickling temperature is controlled at 70~90 DEG C, the acid number requirement in sour pond is not less than 40g/l, and its reason is effective Ensure that the iron scale of hot rolling plate surface thoroughly cleans up, avoid residual oxidization iron sheet from being pressed into matrix after acid rolls, cause leak Plating or the generation of other surfaces quality.
Why reduction ratio is limited 45~75%, and its reason is by cold rolling, the deformation energy storage increase of steel plate, crystal grain quilt Flatten, crushing, the ferrite of elongation is interlaced with pearlite, is advantageous to the recrystallization softening and austenite of ferrite crystal grain Formed, but cold rolling reduction ratio is too big, resistance of deformation increase, adds the load of milling train, wastes the energy；
Why cold rolling exported into the surface reflectivity control of steel plate≤60%, be to show surface of steel plate because reflectivity is low The residual iron level of Residual oil is relatively low, is advantageous to follow-up zinc-plated cleaning and finally improves coating surface quality；
Why annealing temperature is controlled at 770~830 DEG C, its reason is to control the volume of ferrite and austenite Fraction, and then martensite and ferritic ratio are controlled, and the mechanical property of finished product is finally controlled, temperature is too low, and carbide does not have Be completely dissolved, temperature it is too high, austenite volume fraction can accordingly increase, and both of which can cause the quenching degree of austenite to reduce, So as to reduce the volume fraction of martensite in finished product, ultimately result in finished product low cross-intensity or yield strength is higher.
Why dew point in annealing furnace is controlled below -40 DEG C, oxygen content≤3ppm, its reason is to ensure steel plate table Face fully reduces and improves the wellability of steel plate；
Why aluminium content in zinc liquid is controlled in 0.18~0.23%, Fe%≤0.009%, its reason is suppressed in zinc liquid Push up the formation of bottom ash, so as to reduce the generation of surface cadmia and roll marks defect, while can ensure the aluminium in zinc liquid and base steel it Between form fine and close continuous inhibition layer, so as to improve the adhesive force of coating.
Why by finishing elongation control 0.7~1.0%, main function is adjustment finished product plate shape, roughness and bent Take intensity.
Compared with prior art, product material object mechanical property reaches the present invention：295~365MPa of yield strength, tension are strong Spend 515~558MPa, elongation percentage 25 ~ 30%, n values 0.165 ~ 0.18；Product platability is good, coating surface uniform color zero defect, Inhibition layer is continuously fine and close, and Zinc attachability reaches ball and rushes 1 grade of level, and zinc layers and base steel bend test are qualified, can meet middle-and-high-ranking Car is to high strength structure part and the surface quality requirements of outer covering piece.
Brief description of the drawings
Fig. 1 is the metallographic structure figure of Galvanized Dual Phase Steel of the present invention；
Fig. 2 is Galvanized Dual Phase Steel inhibition layer shape appearance figure of the present invention；
Fig. 3 is surface topography after 500MPa levels Galvanized Dual Phase Steel of the present invention bending.
Embodiment
The present invention is described in detail below：
Table 1 is the component comparative example of various embodiments of the present invention and comparative example；
Table 2 is the main technologic parameters comparative example of various embodiments of the present invention and comparative example；
Table 3 is the performance text list of various embodiments of the present invention and comparative example.
Various embodiments of the present invention produce according to following steps：
1）Strand is heated after smelting, refining and be casting continuously to form strand by set composition, heating-up temperature 1200 ~ 1260℃；
2）Finish rolling is carried out, controls its finishing temperature at 880~920 DEG C；
3）Batched：Oiler temperature control is at 570~610 DEG C；
4）Cold rolling is carried out after pickling：Pickling temperature is controlled at 70~90 DEG C, and the acid number in sour pond is not less than 40g/l；Control Cold rolling total reduction is 45~75%；And control surface of steel plate reflectivity≤60%；
5）Carry out galvanizing：In the case where ensuring to enter annealing furnace front spring clean surface, annealed, control annealing temperature exists 770~830 DEG C, dew point control is below -40 DEG C in annealing furnace, oxygen content≤3ppm；Zinc liquid temperature is controlled 455~465 DEG C, aluminium content control is in 0.18~0.23%, Fe%≤0.009% in zinc liquid；
6）Carry out finishing：Finishing elongation control is 0.6~1.0%.
Explanation：Value in one table 1 below and table 2 is not corresponding relation
The chemical composition comparative example of the various embodiments of the present invention of table 1 and comparative example（wt%）
The main technologic parameters list of the various embodiments of the present invention of table 2 and comparative example
The performance test results list of the various embodiments of the present invention of table 3 and comparative example
From table 3 it can be seen that 500MPa levels Galvanized Dual Phase Steel of the present invention is attached in mechanical property, coating surface quality and zinc layers To put forth effort excellent, comparative example 1 is because silicone content is higher, although mechanical property is close with embodiment, coating surface quality and attachment Power is not as good as embodiment；Although the composition of embodiment 2 is close with embodiment, because surface of steel plate reflectivity is too high, zinc liquid aluminium content Relatively low and finishing elongation percentage is too high, causes the rise of finished product yield strength, elongation percentage n values to reduce, while surface quality and coating are attached Put forth effort also not as good as embodiment.
Embodiment shows that 500MPa levels Galvanized Dual Phase Steel product material object mechanical property of the present invention reaches：Yield strength 295~ 365MPa, 515~558MPa of tensile strength, elongation percentage 25 ~ 30%, n values 0.165 ~ 0.18；Product surface quality reaches：Coating Surface color is uniform, and surface zero defect reaches C levels level, and inhibition layer is continuously fine and close, and Zinc attachability reaches ball and rushes 1 grade of level, Zinc layers bend test is qualified, and intermediate car can be met to high strength structure part and the surface quality requirements of outer covering piece.With vapour The light-weighted development of car, the steel have good market prospects.
Present embodiment is only the best example, not to the restricted implementation of technical solution of the present invention.

Claims (4)

1. a kind of 500MPa levels car Galvanized Dual Phase Steel, its component and weight percent content are：C：0.049%, Si： 0.005%, Mn：1.81%, P：0.01%, S：0.005%, Als：0.04%, Mo：0.21%, Cr：0.01%, Nb：0.015%, N：0.0043%, remaining is iron and other inevitable impurity；Metallographic structure is：Ferrite and martensite；Its production stage：
1）Strand is heated after smelting, refining and be casting continuously to form strand by set composition, heating-up temperature is at 1200 DEG C；
2）Finish rolling is carried out, finishing temperature is at 890 DEG C；
3）Batched：Coiling temperature is at 590 DEG C；
4）Cold rolling is carried out after pickling：For pickling temperature at 50 DEG C, the acid number in sour pond is not less than 40g/l；Cold rolling total reduction exists 72.5%；Surface of steel plate reflectivity is 59%；
5）Carry out galvanizing：In the case where ensuring to enter annealing furnace front spring clean surface, annealed, annealing temperature is moved back at 828 DEG C Dew point control is below -40 DEG C in stove, oxygen content≤3ppm；Zinc liquid temperature control aluminium content in 455~465 DEG C, zinc liquid Control is in 0.181%, Fe%≤0.009%；
6）Carry out finishing：Finishing elongation percentage is 0.9%.
2. a kind of 500MPa levels car Galvanized Dual Phase Steel, its component and weight percent content are：C：0.063%, Si： 0.007%, Mn：1.71%, P：0.012%, S：0.002%, Als：0.06%, Mo：0.18%, Cr：0.15%, Nb： 0.012%, N：0.0041%, remaining is iron and other inevitable impurity；Metallographic structure is：Ferrite and martensite；It is produced Step：
1）Strand is heated after smelting, refining and be casting continuously to form strand by set composition, heating-up temperature is at 1220 DEG C；
2）Finish rolling is carried out, finishing temperature is at 900 DEG C；
3）Batched：Coiling temperature is at 600 DEG C；
4）Cold rolling is carried out after pickling：For pickling temperature at 65 DEG C, the acid number in sour pond is not less than 40g/l；Cold rolling total reduction exists 66%；Surface of steel plate reflectivity is 56%；
5）Carry out galvanizing：In the case where ensuring to enter annealing furnace front spring clean surface, annealed, annealing temperature is moved back at 820 DEG C Dew point control is below -40 DEG C in stove, oxygen content≤3ppm；Zinc liquid temperature control aluminium content in 455~465 DEG C, zinc liquid Control is in 0.192%, Fe%≤0.009%；
6）Carry out finishing：Finishing elongation percentage is 1.0%.
3. a kind of 500MPa levels car Galvanized Dual Phase Steel, its component and weight percent content are：C：0.078%, Si： 0.006%, Mn：1.42%, P：0.009%, S：0.004%, Als：0.03%, Mo：0.14%, Cr：0.40%, Nb：0.008%, N：0.0045%, remaining is iron and other inevitable impurity；Metallographic structure is：Ferrite and martensite；Its production stage：
1）Strand is heated after smelting, refining and be casting continuously to form strand by set composition, heating-up temperature is at 1240 DEG C；
2）Finish rolling is carried out, finishing temperature is at 880 DEG C；
3）Batched：Coiling temperature is at 580 DEG C；
4）Cold rolling is carried out after pickling：For pickling temperature at 75 DEG C, the acid number in sour pond is not less than 40g/l；Cold rolling total reduction exists 63%；Surface of steel plate reflectivity is 54%；
5）Carry out galvanizing：In the case where ensuring to enter annealing furnace front spring clean surface, annealed, annealing temperature is moved back at 790 DEG C Dew point control is below -40 DEG C in stove, oxygen content≤3ppm；Zinc liquid temperature control aluminium content in 455~465 DEG C, zinc liquid Control is in 0.212%, Fe%≤0.009%；
6）Carry out finishing：Finishing elongation percentage is 0.8%.
4. a kind of 500MPa levels car Galvanized Dual Phase Steel, its component and weight percent content are：C：0.082%, Si： 0.004%, Mn：1.51%, P：0.006%, S：0.003%, Als：0.07%, Mo：0.04%, Cr：0.50%, Nb：0.009%, N：0.0042%, remaining is iron and other inevitable impurity；Metallographic structure is：Ferrite and martensite；Its production stage：
1）Strand is heated after smelting, refining and be casting continuously to form strand by set composition, heating-up temperature is at 1235 DEG C；
2）Finish rolling is carried out, finishing temperature is at 895 DEG C；
3）Batched：Coiling temperature is at 570 DEG C；
4）Cold rolling is carried out after pickling：For pickling temperature at 83 DEG C, the acid number in sour pond is not less than 40g/l；Cold rolling total reduction exists 58%；Surface of steel plate reflectivity is 53%；
5）Carry out galvanizing：In the case where ensuring to enter annealing furnace front spring clean surface, annealed, annealing temperature is moved back at 785 DEG C Dew point control is below -40 DEG C in stove, oxygen content≤3ppm；Zinc liquid temperature control aluminium content in 455~465 DEG C, zinc liquid Control is in 0.223%, Fe%≤0.009%；
6）Carry out finishing：Finishing elongation percentage is 0.6%.
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CN107099736A (en) * 2017-06-06 2017-08-29 武汉钢铁有限公司 The production method of 500MPa grades of cold-rolled biphase steels
CN107267727A (en) * 2017-06-06 2017-10-20 武汉钢铁有限公司 The manufacture method of 500MPa grades of automobile exterior panel zn-fe alloy coating dual phase sheet steels
CN109868416A (en) * 2019-03-29 2019-06-11 本钢板材股份有限公司 A kind of production technology of low cost hot dip galvanized dual phase steel DP590
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