CN102199723B - High-strength cold-rolled hot-galvanized precipitation reinforced steel and manufacturing method thereof - Google Patents
High-strength cold-rolled hot-galvanized precipitation reinforced steel and manufacturing method thereof Download PDFInfo
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- CN102199723B CN102199723B CN 201010132846 CN201010132846A CN102199723B CN 102199723 B CN102199723 B CN 102199723B CN 201010132846 CN201010132846 CN 201010132846 CN 201010132846 A CN201010132846 A CN 201010132846A CN 102199723 B CN102199723 B CN 102199723B
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Abstract
The invention discloses a high-strength cold-rolled hot-galvanized precipitation reinforced steel plate and a manufacturing method thereof. The steel plate comprises the following components: 0.09 to 0.12 weight percent of C, less than or equal to 0.05 weight percent of Si, 0.8 to 1.8 weight percent of Mn, less than or equal to 0.02 weight percent of P, less than or equal to 0.01 weight percent of S, less than or equal to 0.008 weight percent of N, 0.02 to 0.06 weight percent of Al, 0.05 to 0.08 weight percent of Nb and Ti and the balance of Fe and inevitable impurities. The microstructure of the steel plate is ferrite and second phase particles, wherein the diameter of the second phase particles is about less than 6 mu m, the yield strength is 500 to 600MPa, the tensile strength is 570 to 710MPa, and the total coefficient of elongation is over 14 percent (80 gauge length and transverse stretching). The hot-galvanized steel plate has high welding performance and surface quality and can be widely used in automotive structural membranes.
Description
Technical field
The invention belongs to metal material field, relate to 500MPa level pot galvanize precipitation strength steel sheet.Be particularly related to a kind of high strength cold rolling hot dip galvanizing precipitation strength steel and manufacture method thereof, can be widely used in automobile structure, its welding property is good, surface quality is good.
Background technology
In recent years, be starting point from security, lightweight and the minimizing energy consumption of automobile, various countries have formulated corresponding statutes and regulations, as automotive sheet, use more and more the high-strength hot-dip zinc-coated steel sheet of excellent corrosion resistance.
Past is mainly improved armor plate strength by solution strengthening take carbon aluminium-killed steel and phosphor-containing steel as main.But along with other rising of strength of materials level, consider the welding property of material, can not add carbon and phosphorus, be main so material develops into the precipitation strength steel gradually again, mainly adds the trace alloying elements such as molybdenum, chromium, niobium, titanium, vanadium with low carbon component system again and realize by the compound precipitation strength.On the other hand, in order to improve the solidity to corrosion of steel plate, the surface of steel plate pot galvanize is development trend.But add in a large number the platability that alloying element will worsen the surface.
On general, in order to make the strength increase of steel plate, usually will add the solution strengthening elements such as Mn, but during the reduced anneal before plating, these elements can be in the surface of steel plate enrichment, makes the tackiness with fused zinc reduce the defective that surface of steel plate can not plate.So in order to obtain good pot galvanize high tensile steel plate, need suitable chemical ingredients and manufacturing process.
The characteristics of pot galvanize precipitation strength steel are that yield tensile ratio is higher, have moderate unit elongation and good spot weldability, to plasticity require relatively lowly, be fit to make automobile structure and safety member, such as the stiffener of car door, the base support part of seat etc.
According to the regulation of European standard EN10292, according to yield strength substantially be divided into 260,300,340,380, five ranks of 420MPa, and YS, TS all have the bound requirement, the concrete trade mark and performance requriements are as shown in table 1.Along with the requirement to auto parts intensity further promotes, the current yield strength that also lacks is greater than 500MPa pot galvanize precipitation strength steel.
Table 1: Europe superscript EN10292 standard pot galvanize precipitation strength steel series
| YS rank (MPa) | YS(MPa) | TS(MPa) | EL 80(％) | Note |
| H260LAD+Z/ZF | 260～330 | 350～430 | ≥26 | Laterally |
| H300LAD+Z/ |
300～380 | 380～480 | ≥23 | Laterally |
| H340LAD+Z/ZF | 340～420 | 410～510 | ≥21 | Laterally |
| H380LAD+Z/ZF | 380～480 | 440～560 | ≥19 | Laterally |
| H420LAD+Z/ZF | 420～520 | 470～590 | ≥17 | Laterally |
Show that by the international online update search yield strength is that patent and the document of other high strength cold rolling hot dip galvanizing precipitation strength steel of 500MPa level not yet found, its Patents is as follows:
It is low-carbon (LC) (0.01～0.2%) that Chinese patent application CN99801687.X " high-strength steel sheet, high strength alloyed hot-dip zinc-coated steel plate and their manufacture method " discloses its composition system, added a certain amount of Si (0～1.0%), Gao Meng (more than 1.0%) has also added a small amount of Mo and Cr in addition.The mechanical property scope of final finished be yield strength at 321～412MPa, tensile strength is at 590～678MPa, yield tensile ratio is 0.52～0.63.
Chinese patent application CN02800375.6 " high-strength hot-dip zinc-coated steel sheet and manufacture method thereof " discloses a kind of pot galvanize high tensile steel plate, its chemical ingredients C:0.03～0.25wt%, Si:0.7wt% are following, Mn:1.4～3.5wt%, Cr:0.05～1wt%, Nb:0.005～0.1wt%, all the other are Fe, and are comprised of the complex tissue of ferrite and second-phase.The median size of complex tissue is below 10 μ m.Go out tensile strength greater than 700MPa by explained hereafter such as hot rolling, pickling, pot galvanizes, be difficult for producing the softening high-strength hot-dip zinc-coated steel sheet of HAZ during welding.
Chinese patent application CN200910046439.7 " a kind of steel used for hot galvanizing structural component with high yield ratio and manufacture method thereof " discloses a kind of manufacture method of high-yield-ratio hot-dip galvanizing sheet steel of tensile strength 350Mpa level, welding property is good, surface quality is good, mainly is used as the automobile structural part; The chemical component weight per-cent of its substrate is (wt%): C:0.06～0.08%, Si≤0.03%, Mn:0.15～0.25%, P≤0.02%, S≤0.015%, Al:0.02～0.06%, Nb:0.002～0.01%, and all the other are Fe and inevitable impurity.Microtexture is that ferrite adds second phase particles, and the second phase particles diameter is at 6～10um, and tensile strength is at 360～420MPa, and yield strength is at 270～320MPa, and breaking elongation is greater than 26% (80 gauge lengths, cross directional stretch), and yield tensile ratio is more than 0.7.
From above-mentioned Patents as can be known, Chinese patent CN99801687.X has added a certain amount of Cr and Mo, and manufacturing cost improves accordingly, and yield strength is less than 500MPa.Chinese patent CN02800375.6 has added Cr equally, has affected manufacturing cost, and the addition of Si and Mn is higher, affects the surface quality of pot galvanize.The yield strength of Chinese patent CN200910046439.7 and tensile strength are all on the low side.
Summary of the invention
The purpose of this invention is to provide a kind of high strength cold rolling hot dip galvanizing precipitation strength steel and manufacture method thereof, be used for automobile structure, it has the characteristics such as high-yield-ratio, welding property are good, excellent surface quality, the transverse mechanical performance satisfies yield strength: 500～600Mpa, tensile strength: 570～710Mpa, unit elongation EL80 〉=14%.
Technical scheme of the present invention is: by controlling a certain amount of carbon content, do not add Si, low manganese content, consider Cost Problems, do not add Mo and Cr, add a small amount of microalloy element Nb or Ti, the effect of the solution strengthening by carbon manganese and the precipitation strength of TiNb (C, N) obtains the precipitation strength steel of yield strength 500Mpa, thereby very low Si, Mn content makes hot-dip galvanizing sheet steel have good platability to guarantee that material has good surface quality simultaneously.
Manufacturing for the cold rolling hot dip galvanizing vehicle structural spare of yield strength 500MPa level, Composition Design and production technique are extremely important, in order to satisfy the requirement of vehicle structural spare pressing and jointing, prevent avulsion, resilience etc., so will reduce the fluctuation of material property, will consider simultaneously the impact on welding property during Composition Design as far as possible; On the other hand, the annealing of pot galvanize product is finished at continuous hot galvanizing line, will be through about 460 ℃ zinc pond, so carry the high-intensity while adding alloying element, consider the platability of substrate and the requirement of automobile structure Surface Quality, Si, in annealing process, easily form enrichment when the Mn element is too much on the surface, affect the wetting property of substrate when zinc-plated, cause the zinc-plated defectives such as plating leakage, so do not add the Si element, added the seldom Mn element of amount.
Particularly, high strength cold rolling hot dip galvanizing precipitation strength steel of the present invention, its composition weight percent is:
C：0.09～0.12wt％
Si：≤0.05wt％
Mn：0.8～1.8wt％
P：≤0.02wt％
S：≤0.01wt％
N：≤0.008wt％
Al：0.02～0.06wt％
Nb+Ti：0.05～0.08wt％
Surplus is Fe and inevitable impurity.
In steel of the present invention,
C: be important solution strengthening element, can make material obtain high intensity, but high carbon content can make the stampability of material and weldability worsen, so carbon can not be too high, take again the intensity rank of the 500Mpa that material require reaches and the performance range of standard-required into consideration, so carbon is controlled at 0.09～0.12%.
Si: be ferrite solution strengthening element, but for hot-dip galvanizing sheet steel, surface of steel plate was separated out the generation oxide film when Si content was high affects surface treatment, thereby reduce the moistening adhesive tension of steel plate and liquid zinc, can directly affect the platability of substrate, thereby affect the hot-dip galvanizing sheet steel surface quality, so the Si element is controlled at below 0.05 as far as possible.
Mn: in order to guarantee the comprehensive mechanical performance of steel, need to add a certain amount of Mn, Mn is solid solution element, and is especially favourable to intensity.But one side when Mn content is high is owing to form platability and the surface quality that oxide film affects substrate in the surface of steel plate enrichment in annealing furnace, welding is can produce HAZ softening on the other hand, so should reduce the addition of manganese element under the prerequisite that guarantees the strength of materials as far as possible.Therefore preferable range is 0.8～1.8%.
Al: major function is reductor, should not be excessively low, but affect continuous casting production when too high.Therefore be controlled at 0.02～0.06%.
P: be a kind of solution strengthening element, an amount of P is useful to intensity, but affects weldability when too high, and content is easy to cause central segregation of slab and grain boundary segregation greater than 0.02%, causes along brilliant fracture.So the present invention controls the P element under the prerequisite that guarantees the strength of materials, preferably be no more than 0.02% as far as possible.
S: separate out with MnS inclusion form at steel grade, MnS is elongated in rolling, and when lacking Ca, these inclusiones tend to the toughness of steel is produced adverse influence especially.Too high for fear of inclusion content, so be controlled at below 0.01%.
Ti: be strong carbon, nitride forming element, improve the intensity of steel plate by grain refining.So added the seldom Ti element of amount, under the prerequisite that reduces C, Si, Mn, P constituent content, guarantee on the one hand the intensity of material, make simultaneously material that high yield tensile ratio is arranged, guarantee that finally material has good comprehensive mechanical performance, good weldability and surface quality.But the content of Ti should not surpass 0.08%, otherwise worsens welding property.
Nb: the same with Ti, Nb also is strong carbon, nitride forming element, and by separating out and the refined crystalline strengthening ferrite, same too high levels is with deteriorated processibility.Both compound interpolations can form TiNb (C, the N) compound that disperse distributes in 550 ℃～650 ℃ coiling temperature, and the Effective Raise yield tensile ratio.If compound addition less than 0.05%, is difficult to guarantee yield strength more than 500MPa, therefore the preferred scope of compound interpolation is 0.05～0.08%.
The manufacture method of high strength cold rolling hot dip galvanizing precipitation strength steel of the present invention comprises, at converter or electrosmelting, then is cast as slab by the said ratio material; Carry out again hot rolling, pickling, cold rolling, pot galvanize annealing, flattening process manufactures finished steel coils; Wherein, hot incoming slab Heating temperature 〉=1200 ℃, preferred 1230 ℃; Hot rolling finishing temperature 〉=870 ℃, coiling temperature 〉=550 ℃～650 ℃; Cold rolling draft: 40～70%, annealing temperature: 750 ℃～800 ℃, smooth rate: 0.4%～1.2%; The mechanical property that finally obtains product is: yield strength 500MPa～600MPa, tensile strength 570MPa～710MPa, unit elongation EL80 〉=14%.
In manufacture method of the present invention,
Heating temperature: for so that in the slab Ti, Nb compound fully dissolve, so Heating temperature need to greater than 1200 ℃, preferably reach 1230 ℃.
Finishing temperature: material is that to carry out perfect recrystallization rolling during hot rolling, enters the rolling mixed crystal that causes of two-phase region for fear of material, so finishing temperature will be on the Ar3 temperature, greater than 870 ℃.
Curling temperature: curling excess Temperature, precipitate is thick can to cause TiNb (C, N), and coiling temperature is lower than 550 ℃, it is insufficient to cause precipitate to separate out.Consider separating out and growing up of precipitate, adopt 550～650 ℃ curling, to obtain the suitable carbon of more tiny ferrite matrix grain structure and size, nitrogen precipitate tissue.
Annealing temperature: hot dip galvanizing annealing process as shown in Figure 1, the recrystallization annealing temperature is the of paramount importance technological factor of control high-strength steel performance, the critical recrystallization annealing temperature of steel grade of the present invention is 750～800 ℃, under the prerequisite that guarantees material perfect recrystallization annealing and not alligatoring of austenite structure, take low annealing temperature as far as possible, but consider the platability of zinc layer, so annealing temperature is too not high, better at 750～780 ℃.
Smooth rate: smoothly can improve template, and can eliminate the yield extension platform.But smooth draught is crossed conference and is affected the mechanical properties, and reduces unit elongation.So smooth rate preferably is no more than 1.2%.
Compare from above-mentioned Patents, Chinese patent CN99801687.X has added a certain amount of Cr and Mo, and manufacturing cost improves accordingly, and yield strength is less than 500MPa.Chinese patent CN02800375.6 has added Cr equally, has affected manufacturing cost, and the addition of Si and Mn is higher, affects the surface quality of pot galvanize.The yield strength of Chinese patent CN200910046439.7 and tensile strength are all on the low side, far away not as good as the yield strength 500MPa of steel of the present invention～600MPa, tensile strength 570MPa～710MPa.
Beneficial effect of the present invention
The manufacturing technology of the yield strength 500Mpa pot galvanize precipitation strength steel that the present invention relates to has good weldability and the surface quality of high-quality, and substrate is cold-reduced sheet, and coating divides hot pure zinc plating and hot dip Zn-Fe alloying.Microtexture is illustrated in figure 2 as the complex tissue that ferrite adds second-phase and forms, and the second phase particles disperse distributes, and the diameter of second phase particles is less than 6um.Coating as shown in Figure 3, thickness of coating is at 6～10um.
Steel grade of the present invention is difficult for occuring the softening of HAZ in when welding, according to the carbon equivalent of the experimental formula estimation steel grade of the present invention of carbon equivalent Pcm about 0.226 (general carbon equivalent Pcm can guarantee the material welding property less than 0.24, and steel Pcm of the present invention is:
Pcm＝C+Si/30+Mn/20+2P+4S＝0.10+0.03/30+1.5/20+2×0.01+4×0.005＝0.226
The mechanical property scope of steel of the present invention is yield strength 500～600MPa, tensile strength is at 570～710MPa, tension set EL80 〉=14%, have moderate unit elongation and good spot weldability, be fit to make automobile structure and safety member, such as the stiffener of car door, the base support part of seat etc., has preferably application prospect.
Description of drawings
Fig. 1 is pot galvanize annealing simulation process synoptic diagram;
Fig. 2 is the metallographic structure photo of steel grade of the present invention;
Fig. 3 is the zinc coating photo of steel grade of the present invention;
Fig. 4 is that typical stress-strain(ed) curve comes.
Embodiment
The present invention will be further described below in conjunction with embodiment.
Table 2 is that the chemical ingredients of the embodiment of the invention and comparative example compares, table 3 be the complete processing of the embodiment of the invention and comparative example and Performance Ratio, wherein A～J represents respectively the embodiment of the invention, K, L and M represent respectively comparative example, i.e. China Patent No. CN99801687.X, CN02800375.6 and CN200910046439.7.
Find out that from table 2 and table 3 the production path of present embodiment is conventional production path, steel-making-hot rolling-pickling-cold rolling-pot galvanize-smooth.Compare with comparative example, present embodiment has been saved valuable alloy Cr, the content of Mo from chemical ingredients, effective control by hot rolling technology, annealing temperature and smooth rate, the Mechanical Fluctuation of final finished is less, yield strength is in 500MPa～600MPa scope, and yield tensile ratio remains on more than 0.75.From the typical stress-strain(ed) curve of Fig. 4, annealed and smooth after, top and bottom yield point and yield extension phenomenon do not appear, yield tensile ratio is about 0.84, tensile strength reaches 650MPa, unit elongation is 18%.
Claims (1)
1. high strength cold rolling hot dip galvanizing precipitation strength steel, its composition weight percent is:
C：0.09～0.12wt％
Si：≤0.05wt％
Mn：0.8～1.8wt％
P：≤0.02wt％
S：≤0.01wt％
N：≤0.008wt％
Al：0.02～0.06wt％
Nb+Ti：0.05～0.08wt％
Surplus is Fe and inevitable impurity;
And by following method acquisition, comprise, at converter or electrosmelting, then be cast as slab by said ratio; Carry out again hot rolling, pickling, cold rolling, pot galvanize annealing, flattening process manufactures finished steel coils; Wherein, hot incoming slab Heating temperature 〉=1200 ℃, hot rolling finishing temperature 〉=870 ℃, 550 ℃～650 ℃ of coiling temperatures; Cold rolling draft: 40～70%, annealing temperature: 750 ℃～800 ℃, smooth rate: 0.4%～1.2%; The mechanical property that finally obtains product is: yield strength 500MPa～600MPa, tensile strength 570MPa～710MPa, unit elongation EL80 〉=14%.
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| CN1399001A (en) * | 1997-09-04 | 2003-02-26 | 川崎制铁株式会社 | Steel plate for barrel and its making process and barrel |
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| CN1399001A (en) * | 1997-09-04 | 2003-02-26 | 川崎制铁株式会社 | Steel plate for barrel and its making process and barrel |
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