CN100584984C - Alloyed hot galvanizing bake hardening steel plate and method for manufacturing same - Google Patents
Alloyed hot galvanizing bake hardening steel plate and method for manufacturing same Download PDFInfo
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Abstract
The invention relates to an alloyed hot-galvanized baking-hardened steel plate and the manufacturing method thereof, which solves the problems of the anti-pulverization of the galvanized layer, the surface quality and the baking-hardened value. The mass percentage for the chemical components of a baseplate is as follows: C 0.0015 to 0.0025 percent, Si less than or equal to 0.030 percent, Mn 0.50 to 0.60 percent, P 0.050 to 0.060 percent, S less than or equal to 0.015 percent, N less than or equal to 0.003 percent, sol.Al 0.030 to 0.055 percent, Nb 0.004 to 0.015 percent, O less than or equal to 0.0050 percent and the rest are Fe and unavoidable impurities. The weight of the galvanized layer (for a single side) is 30-60g/m2 and the mass percentage for the Fe component of the galvanized layer is 8 to 12 percent. The steel plate of the invention has excellent anti-pulverization performance of the galvanized layer, excellent surface quality and appropriate baking-hardened value.
Description
Technical field
The present invention relates to a kind of alloyed hot galvanizing bake hardening steel and manufacture method thereof, be meant especially to be used for auto sheet and tame electroplax, this steel plate not only has good coating resistance to chalking energy, also has good surface quality and suitable baking hardening value.
Background technology
The raising that requires along with vehicle safety performance in recent years, the intensity rank of auto sheet is improving constantly, and adopt the high intensity levels steel plate under the prerequisite of not losing vehicle safety performance, to alleviate tare, thereby can reduce automobile fuel consumption and reduce environmental pollution.Therefore, increasing auto sheet adopts High Strength Steel Plate.Yet, the anti-collision performance that auto sheet is not only had relatively high expectations, and require when drawing, to have good forming property.And other improves along with the armor plate strength level usually, and the forming property of steel plate can descend gradually, thereby has limited the application of High Strength Steel Plate on vehicle body.Bake hardening steel but has lower yield strength when punching press, forming property is good, and can improve 30～80MPa by intensity behind the paint baking, thereby have preferably anti-depression and an anti-collision performance, therefore, bake hardening steel can solve the contradiction between steel formability performance and the intensity preferably, good forming property is arranged when reaching punching press and higher intensity is arranged when using.Therefore bake hardening steel is a kind of comparatively ideal high-strength vehicle plate.
Alloyed hot galvanizing bake hardening steel through pot galvanize and coating alloying anneal, not only has excellent corrosion resistant performance, also have good welding property, coating performance and anti-stone and hit performance, be fit to very much be applied to the automobile inner and outer plates that oceanic climate area, the relatively poor area of road conditions and cold district use.Thereby the ratio that alloyed hot-dip galvanized steel sheet uses on vehicle body is improving constantly.At present, Japanese sedan limousine outside plate has all adopted alloyed hot-dip galvanized steel sheet.
In recent years, the usage quantity of alloyed hot galvanizing bake hardening steel on body of a motor car is increasing, but the easy efflorescence when drawing of its coating, not only influences the corrosion resisting property of steel plate, and atomizing coating is easy to influence the surface quality of punching parts in the mould inner accumulated.In addition, in order to guarantee the safety performance of automobile, automobile exterior panel requires the tensile strength of alloyed hot galvanizing bake hardening steel usually more than 340MPa now.In order to reach this intensity rank, solution strengthening elements such as more Mn, Si, P have been added in the substrate of alloyed hot galvanizing bake hardening steel.These elements easily in the surface of steel plate enrichment, form oxide compound in annealing process, influence the wetting property of plating bath to surface of steel plate, form the plating leakage point defect easily, have a strong impact on the surface quality after the automobile exterior panel application, and the alloying annealing process of obstruction coating.
In order to improve the resistance to chalking energy of alloyed hot-dip galvanized steel sheet coating, Japanese Patent No.4285126 proposes compound interpolation Ti and B element in substrate, and adds Zr, La, Ce, Y, one or more elements among the Ca can be produced the alloyed hot galvanizing bake hardening steel that the coating resistance to chalking can be good, its concrete substrate composition requires: C≤0.005%, Si≤1.0%, Mn 0.01～2.0%, P≤0.15%, S≤0.015%, N≤0.005%, sol.Al 0.01～0.1%, and B 0.0005～0.0020%, { (48/12) * [C]+(48/14) * [N] }～0.1%Ti, and contain Zr, La, Ce, Y, one or more elements among the Ca, its total amount are Duoed than S content but less than 0.1%, all the other are Fe and unavoidable impurities element.This patent does not limit the lower limit of C content, be difficult to guarantee stable baking hardening value, and Si content is too high, the platability and the surface quality of steel plate are poor, and the P upper content limit is high too, the coating alloying difficulty, in addition, also have more Ti element in this composition, coating forms a large amount of alloying strip flaws at surface of steel plate easily in the alloying annealing process.This patent requires hot rolling finishing temperature to be controlled at more than 800 ℃, this lower limit temperature is obviously too low, be difficult to guarantee the homogeneity of steel plate tissue and performance when hot rolling finishing temperature is controlled at below 870 ℃ in the actual production process, its finished product are difficult to satisfy the requirement of auto sheet.Annealing temperature was more than 800 ℃ when this patent required substrate annealing, and annealing time is more than 1 second.This annealing time lower limit is also obviously too short, and existing pot galvanize unit annealing time is during less than 10 seconds, and substrate recrystal grain tissue is difficult to evenly, and forming property is poor, and the performance of the finished product also is difficult to satisfy the requirement of auto sheet.
Japan patent of invention No.2002-146475A proposes to add the Sb of total amount between 0.001～0.1% in substrate, Sn, Pb, As, Bi, a kind of or more than one elements among Te and the Se, can also to wherein add (C% * 3+0.02%)～(Nb of quality percentage composition of C% * 8+0.02%) and 0.01～0.06% Ti, can produce tensile strength in the above r value of 340MPa at the alloyed hot galvanizing bake hardening steel more than 1.5.This patent need be added Sb in substrate, Sn, Pb, As, Bi, Te or Se element, cost is higher, in addition, also will add a certain amount of Nb and Ti element, not only production cost is higher relatively, and the interpolation of Ti element produces tangible alloying strip flaw at surface of steel plate easily.This patent requires zinc pot temperature to be controlled between 450～500 ℃, and zinc pot aluminium content is controlled between 0.130～0.150%, and the alloying temperature is controlled between 490～550 ℃.The span of control of this Several Parameters is all obviously bigger than normal, very unreasonable, the reasons are as follows: when zinc pot temperature is controlled between 465～500 ℃, not only zinc pot energy consumption is big, and be easy to generate a large amount of cadmias in the zinc liquid, influence surface quality of products, also be easy to generate a large amount of " prominent quick-fried " tissues during hot dip process, reduce the bonding force of coating.For baking hardened steel, in the time of between zinc pot aluminium content is controlled at 0.135～0.150%, coating is difficult to alloying.And when the alloying temperature is controlled between 530～550 ℃, generating a large amount of Γ phases in the coating easily, the coating efflorescence is serious.
Japan patent of invention No.2004-263238 proposes only to add Nb in substrate promptly can produce the alloyed hot galvanizing bake hardening steel with excellent formability energy and surface quality, the concrete composition quality percentage composition of its substrate requires: C (%) :≤0.003, Si (%) :≤0.10, Mn (%): 0.20～1.0, P (%): 0.01～0.03, Sol.Al (%): 0.01～0.10, Nb (%): (2 * [C]+0.01)～(8 * [C]+0.01).This patent does not limit the lower limit of C content, therefore is difficult to obtain stable baking hardening value.This patent is high too to the restriction upper limit of Si content, and the platability of steel plate is poor, and surface of steel plate is easy to generate the plating leakage point defect, is difficult to produce the alloyed hot galvanizing bake hardening steel of great surface quality.This patent P constituent content is controlled between 0.01～0.03%, though the relatively easy alloying of coating is easy to generate a large amount of Γ phases in the coating in the coating alloying annealing process, the resistance to chalking of coating can be relatively poor.In addition, this patent does not all provide very crucial parameter such as zinc pot temperature, zinc pot aluminium content, coating alloying annealing temperature and coating alloying annealing time, is difficult to directly apply to industrial production.
Has other alloyed hot galvanizing bake hardening steel of 340MPa level in order to produce, U.S. Patent No. 5897967 proposes to add 0.017～0.045% P in substrate, and the content of Si is controlled between 2.5 * P (%)～0.20% according to the content of P, but this patent requires C content to be controlled between 0.004～0.008%, C content is obviously higher, influence the forming property of steel plate, and the baking hardening value of this steel plate can only guarantee more than 10MPa, can't satisfy the requirement of Hyundai Motor plate to baking hardened steel baking hardening value.In addition, add a large amount of Si elements in this substrate, be easy to when pot galvanize, form the plating leakage point defect, influence the surface quality of the finished product, be difficult to be applied to automobile exterior panel.
U.S. Patent No. US6623691 then proposes compound interpolation Ti in substrate, and Nb and B element can be produced baking hardening value suitable hot pure zinc plating and alloyed hot-dip galvanized steel sheet.But because this patent has been added the Ti element in substrate, coating surface is easy to generate the alloying strip flaw when the coating alloying anneal, influences the surface quality of automobile exterior panel.
Summary of the invention
The object of the present invention is to provide a kind of alloyed hot galvanizing bake hardening steel and manufacture method thereof, this steel plate has good coating resistance to chalking energy, also have good surface quality and suitable baking hardening value, be fit to very much be applied to inside and outside plate of automobile and tame electroplax.
For achieving the above object, technical solution of the present invention is,
A kind of alloyed hot galvanizing bake hardening steel, its chemical ingredients mass percent is: C0.0015～0.0025, Si≤0.030, Mn 0.50～0.60, P 0.050～0.060, S≤0.015, N≤0.003, sol.Al 0.030～0.055, Nb 0.004～0.015, O≤0.0050, all the other are Fe and unavoidable impurities.
Wherein, preferably, O≤0.0040, S is controlled at≤and 0.010, by percentage to the quality.
Do not add the Ti element in the substrate of the present invention, only add minor N b element, therefore be not easy to produce the alloying striped, also will suitably add lower-cost P element in addition, overall cost is relatively low, and Si content is low, and the platability of steel plate and surface quality are all good.In addition, substrate C content is carried out strictness control, can guarantee that the finished product baking hardening value is between 30～60MPa.The drawing performance of balance material, baking and hardening performance, ageing resistance performance and surface quality preferably, so prospects for commercial application is wide.
In the present invention,
The C:C element is the key element that influences baking hardening value and steel formability performance.During the drawing of normal temperature lower steel plate, wish that steel plate has lower yield strength, higher unit elongation and r value, and have good ageing resistance performance at normal temperatures.When C content increases, steel formability degradation, and also variation of anti-natural ageing performance at room temperature, for the baking hardening value that is not higher than 60MPa and normal temperature ageing resistance performance preferably, the present invention requires the C constituent content to be controlled at below 0.0025%.When the C constituent content was low, steel plate was more difficult to get enough baking hardening values, and in order to guarantee the baking hardening value more than 30MPa, the present invention requires the C constituent content to be controlled at more than 0.0015%.
Si:Si is a strengthening element, but increase along with Si content, surface of steel plate Si enrichment is obvious after the thermal treatment, the platability of steel plate can descend, and surface of steel plate is easy to generate the plating leakage point defect, and instrument does not influence the corrosion resisting property of steel plate, and have a strong impact on the surface quality of steel plate, can not be used for automobile exterior panel, so the present invention requires Si content to be strict controlled in below 0.030%.
Mn:Mn is a main solution strengthening element of the present invention, and it has considerable influence to the performance of the finished product.Mn content of the present invention surpasses at 0.60% o'clock, and the intensity of steel plate is higher, and forming property descends, and surface of steel plate is easy to generate plating leakage point and alloying strip flaw, therefore, requires Mn content to surpass 0.60%.In order to guarantee enough intensity, the present invention also requires Mn content must not be lower than 0.50%.
P:P is a kind of effective solution strengthening element, and the present invention requires the P element to be controlled between 0.05～0.06%.When P content was higher than 0.060%, armor plate strength increased, and the platability variation, and the more difficult alloying of coating.When the P constituent content less than 0.05% the time, the intensity of steel plate be cannot say for sure card, and during coating alloying annealing, forms a large amount of Γ mutually easily between coating and the substrate, the steel plate coating resistance to chalking can be relatively poor.
Deoxidant element when Al:Al is steel-making, when the Al constituent content is lower than 0.030%, the deoxidizing capacity deficiency, when the Al constituent content surpasses 0.55%, also can not increase deoxidation effect, and along with the increase of Al content, cost increases and influences the surface quality of the finished product.Therefore, the present invention requires solid solution sol.Al content is controlled between 0.030%～0.055%.
Nb:Nb is a carbide forming element, suitably adds the intensity that Nb can improve steel plate, and substitutes the coating surface quality that Ti can improve steel plate with Nb.The present invention requires Nb content to be controlled between 0.004%～0.015%.When Nb content surpassed 0.015%, production cost increased, and the baking and hardening performance of steel plate is variation also.When Nb content was lower than 0.004%, the r value of steel plate reduces, and was unfavorable to the forming property of steel plate, and the baking hardening value surpasses 60MPa, the also easy variation of the ageing resistance performance of material easily.
Ti:Ti also is a carbide forming element, suitably add Ti and can reduce the alloying annealing temperature of coating significantly, reduce the coating alloying annealing time, but adding the Ti element makes steel plate form a large amount of " prominent quick-fried " tissues easily in the hot dip process process, reduce binding force of cladding material, and, the existence of Ti element, be easy to make coating in alloying anneal process, to form tangible alloying striped, have a strong impact on the surface quality of coating.Therefore, do not add the Ti element among the present invention.
N:N is the detrimental impurity element, and in order to make the finished product obtain forming property and ageing resistance performance preferably, the present invention requires the N constituent content to be controlled at below 0.003%, is controlled at below 0.002% even more ideal.
S:S is the detrimental impurity element, and the present invention requires the S constituent content to be controlled at below 0.015%, is controlled at below 0.010% even more ideal.
O:O also is the detrimental impurity element, how much O's has reflected the quantity of non-metallic inclusion in the material, and too much inclusion not only influences punching performance, and can influence surface quality, so the present invention requires the O constituent content to be controlled at below 0.0050%, is controlled at below 0.0040% even more ideal.
The manufacture method of alloyed hot galvanizing bake hardening steel of the present invention, it comprises the steps:
1) its chemical ingredients mass percent of steel plate is: C 0.0015～0.0025, Si≤0.030, Mn 0.50～0.60, P 0.050～0.060, S≤0.015, N≤0.003, sol.Al0.030～0.055, Nb 0.004～0.015, O≤0.0050, all the other are Fe and unavoidable impurities;
2) smelt, be continuously cast into slab by mentioned component;
3) hot rolling: slab heating, Heating temperature: 1190～1250 ℃; Hot rolling finishing temperature: 890～930 ℃; Coiling temperature: 650～750 ℃;
4) pickling and cold rolling: cold rolling draft is controlled between 75%～80%;
5) annealing before the hot dip process: annealing temperature: 780～870 ℃, soaking time: 20～50s;
6) galvanizing: the band steel is gone into zinc pot temperature greater than zinc bath temperature, and is less than or equal to 480 ℃; Galvanizing bath temperature: 455～465 ℃; Total aluminium quality percentage composition of hot-dip galvanizing bath is controlled at 0.120～0.130%;
7) annealing of the coating alloying after the hot dip process: annealing temperature is controlled between 470～530 ℃; The coating alloying annealing time is controlled between 12～25s.
Further, step 8) coating alloying annealing back is smooth, and smooth elongation control is between 1.0～1.5%.Step 8) coating alloying annealing back is smooth, and smooth working roll roller is directly selected for use more than the Φ 420mm.
Again, in the step 6), coating weight (single face) is controlled at 30～60g/m
2Between.
In the step 3), coiling temperature is controlled between 690 ℃～730 ℃.
Alloyed hot galvanizing bake hardening steel of the present invention adopts following operation production: associating → continuous annealing and pot galvanize → coating alloying anneal → smooth are rolled in steel-making → continuous casting → hot rolling → acid;
Perhaps, adopt steel-making → continuous casting → hot rolling → pickling → cold (company) to roll → continuous annealing and pot galvanize → coating alloying anneal → smooth or steel-making → continuous casting → hot rolling → pickling → (repeatedly reversible) cold rolling → continuous annealing and pot galvanize → coating alloying anneal → flattening process production.
Steel-making: molten steel suitable blow off [C] and ladle F[O in converter smelting] be the key of the follow-up concise deoxidation effect of assurance.Carry out the RH vacuum outgas and handle in refining, [C] control is the key of the suitable baking hardening value of assurance the finished product, considers in the operation process of back to have the carburetting phenomenon, and [C] should be controlled between 0.0015～0.0022% during steel-making.In addition, the control of steel inclusion also is the key of steel making working procedure, so should strictly control O content, O content should be controlled at below 0.0050% during steel-making.
Hot rolling: the tapping temperature of slab is controlled between 1190 ℃～1250 ℃ before the hot rolling; Hot rolling finishing temperature is controlled between 890 ℃～930 ℃.Theoretical and production practice have all proved finishing temperature greater than 930 ℃, and the hot rolled strip surface oxidation is serious, and product surface quality is poor, but finishing temperature causes the inequality of the finished product structure property when being lower than 890 ℃ easily.The alloyed hot galvanizing bake hardening steel that the present invention produces, when hot rolling finishing temperature was controlled at 900 ℃ of left and right sides, the belt steel surface oxidation was lighter, and follow-up pickling efficient is improved, and product surface quality also improves, and the finished product structure property is even.The hot rolling reeling temperature requirement is controlled between 650 ℃～750 ℃, and preferably is controlled between 690 ℃～730 ℃.Adopt higher hot rolling reeling temperature, though can make the postorder pickling difficulty that becomes relatively, higher hot rolling reeling temperature helps the raising of substrate punching performance, forms thicker Γ mutually when also helping suppressing coating alloying annealing between coating and substrate.When the hot rolling reeling temperature surpassed 750 ℃, steel plate easily scratched end to end, and follow-up pickling is very difficult, thereby roll hard material the association iron scale is pressed into.When the hot rolling reeling temperature was lower than 650 ℃, the band steel mechanical property was relatively poor, and particularly yield strength increases and plasticity decline.
Pickling and cold rolling: can adopt acid to roll the production of associating unit, perhaps first pickling, after carry out cold continuous rolling or repeatedly reversible cold rolling, but preferably adopt acid to roll the production of associating unit, to enhance productivity and lumber recovery.Should adjust unit speed according to the pickling ability of unit during pickling, guarantee pickling effect.Cold rolling draft is controlled between 75%～80%, as adopting five frame tandem rollings.Cold rolling deflection will influence the mechanical property of material, and suitable cold rolling reduction is convenient to roll the assurance of hard material dimensional precision and the control of plate shape.The forming property of the too little then material of deflection is poor, and it is poor that the too greatly then cold rolling production of deflection consumes increase and rolls hardwood board shape, influences the stable logical plate of the zinc-plated unit of subsequent thermal and the plate shape of the finished product.
Annealing and pot galvanize: alloyed hot galvanizing bake hardening steel annealing of the present invention and pot galvanize are all carried out at the pot galvanize unit.During annealing, annealing temperature is controlled between 780 ℃～870 ℃, and soaking time is controlled between 20s～50s.When annealing temperature was higher than 870 ℃, armor plate strength can be on the low side, and influence surface quality, and energy expenditure also will increase simultaneously.When annealing temperature was lower than 780 ℃, armor plate strength was higher, and the finished product forming property is poor.During pot galvanize, zinc pot temperature is controlled between 455 ℃～465 ℃, and the total aluminium content of zinc pot is controlled between 0.120%～0.130%.The total aluminium content of zinc pot is lower than at 0.120% o'clock, the Fe that generates between coating and the substrate
2Al
5The blocking layer is inhomogeneous, and not only coating is easy to occur alloying, and coating is easy to occur the alloying level inequality, and plate surface quality is poor.The total aluminium content of zinc pot is higher than at 0.130% o'clock, the Fe that produces between coating and the substrate
2Al
5The blocking layer is blocked up, and the coating alloying difficulty needs to improve the alloying annealing temperature or reduces unit speed, and the easy efflorescence of coating.Therefore, the present invention requires the total aluminium content of zinc pot to be controlled between 0.120%～0.130%.Thickness of coating can have bigger influence to the resistance to chalking of coating alloying annealing back steel plate.When coating weight less than 30g/m
2The time, corrosion resistance coating is lower, when coating weight greater than 60g/m
2The time, the coating resistance to chalking can be relatively poor.Therefore, the present invention requires the single-face plating weight control at 30g/m
2～60g/m
2Between.
Coating alloying annealing: require the alloying annealing temperature to be controlled between 470 ℃～530 ℃ when alloyed hot galvanizing bake hardening steel of the present invention carries out the coating alloying anneal, soaking time is controlled between 12s～25s, and requires the coating iron level to be controlled between 8%～12%.When the coating alloying annealing temperature is lower than 470 ℃, the difficult alloying fully of coating, the coating iron level is low, and coating surface is residual a large amount of ζ phases easily, and corrosion resistance coating, welding property and coating performance are all relatively poor at this moment, and the forming property of steel plate is also relatively poor.When the coating alloying annealing temperature is higher than 530 ℃, generate a large amount of Γ mutually easily between coating and the substrate, coating iron level height, the coating resistance to chalking can be relatively poor.In order to obtain good coating resistance to chalking energy, the adjustment by above-mentioned parameter is controlled between 8%～12% the coating iron level.
Adopt the single stand four-roller levelling machine to carry out smooth after the alloyed hot galvanizing bake hardening steel alloying anneal of the present invention, smooth elongation control is between 1.0%～1.5%, smooth unit elongation was less than 1.0% o'clock, be difficult to eliminate the yield point elongation of material, the surface is easy to occur slip line during material deformation, smooth in addition unit elongation hour, the slight defective of some of surface of steel plate also is difficult to eliminate by smooth operation, therefore cause the surface quality of steel plate poor, and steel surface roughness value difficulty satisfies customer requirements, smooth unit elongation was greater than 1.5% o'clock, the plasticity of the finished product descends, forming property worsens, and cause the BH value on the low side, and smooth roller roller consumption also can increase, and in addition in order to ensure the surface quality and the material capability of alloyed zinc hot dip galvanized baking hardened steel, smooth working roll roller footpath is preferably selected for use more than the Φ 420mm.
Embodiment
It below is the example explanation that the present invention produces alloyed hot galvanizing bake hardening steel.
Molten steel is handled through RH refining vacuum outgas, and has adopted the measure of various control inclusion, produces continuously cast bloom through conventional continuous casting process at last, and the chemical ingredients of molten steel is as shown in table 1.
Table 1 substrate chemical ingredients actual achievement, Wt%
| Embodiment | C | Si | Mn | P | S | N | Sol.Al | Ti | Nb | O | Fe |
| 1 | 0.0015 | 0.030 | 0.60 | 0.050 | 0.010 | 0.0018 | 0.037 | 0 | 0.004 | 0.0038 | Surplus |
| 2 | 0.0020 | 0.021 | 0.55 | 0.052 | 0.008 | 0.0025 | 0.030 | 0 | 0.009 | 0.0040 | Surplus |
| 3 | 0.0023 | 0.005 | 0.50 | 0.055 | 0.015 | 0.0023 | 0.046 | 0 | 0.013 | 0.0035 | Surplus |
| 4 | 0.0024 | 0.009 | 0.52 | 0.058 | 0.007 | 0.0030 | 0.055 | 0 | 0.012 | 0.0045 | Surplus |
| 5 | 0.0019 | 0.007 | 0.56 | 0.060 | 0.005 | 0.0022 | 0.050 | 0 | 0.008 | 0.0050 | Surplus |
| 6 | 0.0025 | 0.006 | 0.51 | 0.057 | 0.009 | 0.0026 | 0.053 | 0 | 0.015 | 0.0032 | Surplus |
| Comparative Examples 1 | 0.0015 | 0.01 | 0.15 | 0.005 | 0.006 | 0.0020 | 0.025 | 0.032 | - | - | Zr：0.04 |
| 2 | 0.0030 | 0.10 | 0.10 | 0.011 | 0.010 | 0.0025 | 0.031 | 0.042 | - | - | La：0.05 |
| 3 | 0.0021 | 0.08 | 0.09 | 0.008 | 0.004 | 0.0018 | 0.035 | 0.035 | - | - | Ce：0.03 |
The hot rolling cogging temperature that continuously cast bloom heats before hot rolling is batched after roughing, finish rolling and laminar flow cooling, cools off after CDCM unit (pickling and cold continuous rolling associating unit) is produced cold-reduced sheet through 2～3 days room temperatures.Concrete processing parameter sees Table 2:
Table 2 main technologic parameters actual achievement
| Embodiment | Tapping temperature (℃) | Hot rolling finishing temperature (℃) | The hot rolling reeling temperature (℃) | Cold rolling draft (%) |
| 1 | 1190 | 890 | 690 | 75 |
| 2 | 1200 | 910 | 750 | 78 |
| 3 | 1210 | 900 | 720 | 78 |
| 4 | 1250 | 920 | 700 | 78 |
| 5 | 1220 | 930 | 700 | 80 |
| 6 | 1200 | 910 | 650 | 78 |
| Comparative Examples | - | ＞800 | 500～800 | - |
With cold rolled strip clean at the pot galvanize unit, annealing, pot galvanize, coating alloying annealing and smooth, parameter and annealing, coating alloying annealing and smooth parameter are as shown in table 3.
Table 3 parameter and annealing actual achievement
| Embodiment | Annealing temperature (℃) | Annealing time (s) | The total aluminium content of zinc pot (%) | The coating alloying annealing temperature (℃) | Coating alloying soaking time (s) | Smooth extension (%) |
| 1 | 850 | 30 | 0.125 | 510 | 18 | 1.0 |
| 2 | 870 | 20 | 0.120 | 520 | 12 | 1.3 |
| 3 | 850 | 40 | 0.124 | 480 | 24 | 1.5 |
| 4 | 830 | 40 | 0.130 | 505 | 24 | 1.2 |
| 5 | 780 | 50 | 0.125 | 470 | 30 | 1.3 |
| 6 | 840 | 40 | 0.128 | 490 | 24 | 1.4 |
| Comparative Examples | 800～Ar 3 | ＞1 | - | - | - | - |
The mechanical property of the finished product and the curved ranks of 60 ° of V of coating resistance to chalking energy are as shown in table 4.
Table 4 mechanical property actual achievement and coating resistance to chalking can the curved ranks of V
| Embodiment | σ 0.2 (MPa) | σ h (MPa) | Tension set (%) | r 90 | The BH value * (MPa) | The coating resistance to chalking can 60 ° of curved ranks of V ** |
| 1 | 229 | 346 | 42 | 1.68 | 30 | Secondary |
| 2 | 231 | 350 | 41 | 1.66 | 37 | Level Four |
| 3 | 225 | 344 | 42 | 1.70 | 45 | Secondary |
| 4 | 233 | 349 | 40 | 1.63 | 50 | Three grades |
| 5 | 235 | 358 | 39 | 1.64 | 35 | One-level |
| 6 | 228 | 346 | 40 | 1.65 | 52 | Secondary |
*Annotate: the BH value is BH herein
2, during measurement, the predeformation amount of steel plate is: 2%, and storing temperature is 170 ℃, storing time is: 20min.
*Annotate: 60 ° of curved ranks of V are divided into nine grades, and one-level is best with regard to the resistance to chalking energy, and nine grades the poorest, and one～Pyatyi is qualified.
In sum, the present invention is by adding minor N b element in substrate, and P constituent content that raises the cost lower and raising hot rolling reeling temperature, promptly can produce the alloyed hot galvanizing bake hardening steel that the coating resistance to chalking can be good, and need not add Si and Ti in the substrate, so the surface quality of steel plate is good, is fit to very much be applied to inside and outside plate of automobile and tame electroplax.
Claims (8)
1. alloyed hot galvanizing bake hardening steel, its chemical ingredients mass percent is:
C 0.0015～0.0025
Si ≤0.030
Mn 0.50～0.60
P 0.050～0.060
S ≤0.015
N ≤0.003
sol.Al 0.030～0.055
Nb 0.004～0.015
O ≤0.0050
All the other are Fe and unavoidable impurities.
2. alloyed hot galvanizing bake hardening steel as claimed in claim 1 is characterized in that, O≤0.0040%, by percentage to the quality.
3. alloyed hot galvanizing bake hardening steel as claimed in claim 1 is characterized in that S is controlled at 0.010%, by percentage to the quality.
4. the manufacture method of alloyed hot galvanizing bake hardening steel as claimed in claim 1, it comprises the steps:
1) smelts, is continuously cast into slab by following composition; The chemical ingredients mass percent of steel plate is: C 0.0015～0.0025, Si≤0.030, Mn 0.50～0.60, P0.050～0.060, S≤0.015, N≤0.003, sol.Al 0.030～0.055, Nb0.004～0.015, O≤0.0050, all the other are Fe and unavoidable impurities;
Wherein, carry out decarburization and remove detrimental impurity in convertor steelmaking process, carry out vacuum outgas and handle in refining, C is controlled at 0.0015～0.0022%; O content is controlled at below 0.0050%;
2) hot rolling: slab heating, Heating temperature: 1190～1250 ℃; Hot rolling finishing temperature: 890～930 ℃; Coiling temperature: 650～750 ℃;
3) pickling and cold rolling: cold rolling draft is controlled between 75%～80%;
4) annealing before the hot dip process: annealing temperature: 780～870 ℃; Soaking time: 20～50s;
5) galvanizing: the band steel is gone into zinc pot temperature greater than zinc bath temperature, and is less than or equal to 480 ℃; Galvanizing bath temperature: 455～465 ℃; Total aluminium quality percentage composition of hot-dip galvanizing bath is controlled at 0.120～0.130%;
6) annealing of the coating alloying behind the galvanizing: annealing temperature is controlled between 470～530 ℃; The coating alloying annealing time is controlled between 12～25s.
5. the manufacture method of alloyed hot galvanizing bake hardening steel as claimed in claim 4 is characterized in that, step 7) coating alloying annealing back is smooth, and smooth elongation control is between 1.0～1.5%.
6. the manufacture method of alloyed hot galvanizing bake hardening steel as claimed in claim 5 is characterized in that, step 7) coating alloying annealing back is smooth, and smooth working roll roller is directly selected for use more than the Φ 420mm.
7. the manufacture method of alloyed hot galvanizing bake hardening steel as claimed in claim 4 is characterized in that, in the step 5), the coating weight single face is controlled at 30～60g/m
2Between.
8. the manufacture method of alloyed hot galvanizing bake hardening steel as claimed in claim 4 is characterized in that step 2) in, coiling temperature is controlled between 690 ℃～730 ℃.
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