CN103451519B - A kind of thickness is greater than cold rolling hot dipping steel plating and the production method thereof of 1.5mm bending and forming - Google Patents
A kind of thickness is greater than cold rolling hot dipping steel plating and the production method thereof of 1.5mm bending and forming Download PDFInfo
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Abstract
The present invention relates to cold rolling hot dipping steel plating and production method thereof that a kind of thickness is greater than 1.5mm bending and forming, mainly solving the existing technical problem by reducing annealing speed or the raising insurmountable think gauge of annealing temperature cold rolling hot dipping steel plating cracking during bending.Production method adopts desulfurizing iron after smelting by composition successively, converter top bottom blowing, steel ladle bottom argon blowing or the refining of LF stove, low-carbon steel protecting slag blows Ar protective casting, bar plate heating stove heats, de-scaling, roughing, finish rolling, back segment controlled cooling model, batch acquisition hot rolled strip, then uncoiling again, through pickling, cold rolling, horizontal chamber oven continuous annealing, hot dip process, batch and obtain finished product, continuous casting steel billet Heating temperature is 1180 ~ 1220 DEG C, after roughing, intermediate blank is after Coil Box rolling, uncoiling enters finish rolling first passage frame again, finish rolling start rolling temperature is 1000 ~ 1040 DEG C, finish rolling finishing temperature is 860 ~ 900 DEG C, coiling temperature is 570 ~ 650 DEG C, cold rolling draft is 40 ~ 60%, the hard state band steel that rolls after cold rolling is 720 ~ 770 DEG C in the temperature range of the soaking zone of horizontal chamber oven continuous annealing, band steel is 60-90s in the soaking zone time.Product of the present invention is mainly for the manufacture of products such as industrial electro gas holder casing, the stupefied bars in light steel construction roof.
Description
Technical field
The present invention relates to a kind of cold rolling hot dipping steel plating and manufacture method thereof, particularly a kind of cold rolling hot dipping steel plating of bending and forming and production method thereof.
Background technology
In building, industrial electric industry, the usage quantity of the cold rolling hot dipping of the think gauge for bending and forming steel plating is increasing, and such as the product such as industrial electro gas holder casing, the stupefied bar in light steel construction roof uses this kind of material all in a large number.
Compared with traditional hot-rolled steel sheet, sandblasting steel plate, pickled plate, cold rolling hot dip plated steel has that forming property is good, dimensional precision is high, performance evenly.Along with society is to the raising of environmental protection, material cost-effectiveness requirement, in building, industrial electric industry, more multiple enterprises requires to use cold rolling hot dipping steel plating to substitute traditional hot-rolled steel sheet, sandblasting steel plate, pickled plate.For ensureing structural strength, the rigidity of structural part, the cold rolling hot dipping steel plating of think gauge is used widely.The cold rolling hot dipping steel plating of think gauge is using, is adding man-hour, generally all want bending and forming, particularly wide-angle bending and forming, higher to the intensity of material, toughness reguirements, the Properties Control of material is bad there will be cracking during bending phenomenon, has a strong impact on the safe handling of structural part.
For ensureing that material has good bending and forming performance, traditional method reduces yield strength, raising unit elongation.Concerning the cold rolling hot dipping steel plating of think gauge, general selection reduces annealing speed or raising annealing temperature ensures that material obtains lower yield strength, but this can not significantly improve the unit elongation of material, sometimes even also can reduce unit elongation, cause still there is a certain proportion of product cracking during bending.The patent document of Chinese Patent Application No. CN200710093976.8 discloses a kind of production technique being applicable to hot-dip aluminizing zincium steel plate/belt for deep drawing, calculate by its invention case 2, when producing > 1.2mm hot-dip aluminizing zinc product, for ensureing material low yield strength, under soaking zone temperature ensures 850 DEG C of conditions, require that annealing speed is at below 50m/min, under this annealing speed, product surface quality is poor.If material composition selects ultra low-carbon steel to produce the cold rolling hot dipping steel plating of think gauge, although can solve cracking during bending problem, product strength is lower, production cost is higher, cannot meet user's service requirements and cost-effectiveness requirement.
Cold rolling draft affects punching press, the forming property of material, volume the 2nd phase in June, 2000 Chinese periodical " steel vanadium titanium " the 21st " cold rolling draft is on the impact of carbon aluminium-killed steel cold-reduced sheet deep drawability " describes the cold rolling draft of the best that material obtains good deep drawability and is respectively: soft steel is about 70%, micro-carbon steel is about 80%, the r value that ultra low-carbon steel is about 90%, IF steel then increases with the increase of cold rolling draft.At present, the cold rolling draft of domestic and international enterprise think gauge cold rolling hot dip process product made from steel is generally not less than 60%, such as, the product of thickness 2mm generally uses the hot-rolled sheet pickling, cold rolling of 5 or 5.5mm, draft is respectively 60%, 63.6%, but improve draft again and then need thicker hot-rolled sheet, require higher to the rolling power of cold-rolling equipment.Because draft is lower, the forming property of material declines obviously, and therefore, the cold rolling hot dip process product made from steel of think gauge is generally not suitable for deep hole pinching.
Summary of the invention
The object of the invention is to meet lower cost, in batches, the think gauge cold rolling hot dip process product made from steel demand of stably manufactured bending and forming purposes, the cold rolling hot dipping steel plating of a kind of think gauge of bending and forming excellent property and manufacture method thereof are provided, solve the cold rolling hot dipping steel plating of existing think gauge to exist due to Composition Design and hot rolling, cold-rolling process aspect, cause during the bending and forming course of processing, occurring that the technical problem of cracking during bending easily occurs material.
The technical solution used in the present invention is:
Thickness is greater than a cold rolling hot dipping steel plating for 1.5mm bending and forming, chemical component weight per-cent: C:0.025 ~ 0.1%, Si:0 ~ 0.05%, Mn:0.1 ~ 0.4%, P≤0.015%, S≤0.015%, Alt:0.025 ~ 0.065%, surplus is Fe and inevitable impurity element.
The reason that bending and forming of the present invention is limited in above-mentioned scope by the chemical composition of cold rolling hot dipping steel plating is as follows:
Carbon: the C content in steel, is conducive to low cost and obtains suitable yield strength and higher unit elongation, ensures the economy of the forming property of material, intensity and material.C content in suitable increase steel, can reduce Mn content, and materials'use performance does not decline, and the economy of material improves further.Therefore, C content range set of the present invention is 0.025 ~ 0.1%;
Silicon: the Si content in soft steel aluminium killed steel increases, the plasticity of infringement cold-rolled steel sheet and forming property.Si content requirement is too low, can improve the cost of steel-making refining procedure.Technical solution of the present invention setting Si content 0 ~ 0.05%;
Manganese: Mn mainly exists with solid solution condition in steel, and Main Function is raising intensity, if but Mn too high levels, then unfavorable to forming property index r value, and cost increases, economy declines.Technical solution of the present invention setting Mn content range is 0.1 ~ 0.4%;
Phosphorus: P is generally solid-solubilized in ferrite, there is very strong solution strengthening effect, phosphorus also has serious segregation tendency, and spreads very slow in perlite and ferrite, is not easy homogenizing and produces high phosphorus band and low-phosphorous band, along with phosphorus content in steel increases, phosphorus strengthens the solution strengthening effect of steel, and banded structure increases the weight of, and the intensity of steel plate and hardness raise, and plasticity and toughness sharply decline, forming property degenerates.Consider actual dephosphorizing capacity, technical solution of the present invention setting P≤0.015%;
Sulphur: in bending deformation process, first stress concentration makes sulfide inclusion split, or makes to be mingled with to be separated with metallic matrix and produce micro-hole, and these holes are constantly grown up with deformation process, then further expand and cause steel plate to ftracture.For ensureing certain forming property, technical solution of the present invention setting S≤0.015%;
Aluminium: because Si content is little, steel-making adopts aluminium deoxidation, needs aluminium content to be not less than 0.015%.In order to ensure that deoxidation is abundant, setting lower limit is 0.025%.But when Al amount is too high, can increase cost of alloy, and have certain influence to continuous casting casting cycle, the oxide compound Al2O3 that also can form too much deoxidation products Al is in addition mingled with.Al content range of the present invention is 0.025 ~ 0.065%.
A kind of thickness is greater than the production method of the cold rolling hot dipping steel plating of 1.5mm bending and forming, smelt by following Ingredient percent: C:0.025 ~ 0.1%, Si:0 ~ 0.05%, Mn:0.1 ~ 0.4%, P≤0.015%, S≤0.015%, Alt:0.025 ~ 0.065%, surplus is Fe and inevitable impurity element; Desulfurizing iron, converter top bottom blowing, steel ladle bottom argon blowing or the refining of LF stove, low-carbon steel protecting slag is adopted to blow Ar protective casting, bar plate heating stove heating, de-scaling, roughing, finish rolling, back segment controlled cooling model, batch acquisition coils of hot-rolled steel successively; then uncoiling again, through pickling, cold rolling, horizontal chamber oven continuous annealing, hot dip process, batch and obtain finished product, it is characterized in that:
1, the carbon content setting in steel
C content in steel, is conducive to low cost and obtains suitable yield strength and higher unit elongation, ensures the economy of the forming property of material, intensity and material.C content in suitable increase steel, can reduce Mn content, and reduce smelting cost, materials'use performance does not decline, and the economy of material improves further.Therefore, C content range set of the present invention is 0.025 ~ 0.1%; The preferred content target value of carbon is 0.03 ~ 0.04%.
2, finish rolling end temp setting
For preventing finish rolling in two-phase region rolling, the height that finishing temperature will set; But consider the factor that fining austenite grains degree and minimizing precipitate are grown up, finishing temperature again can not be too high.Therefore, consider, finish rolling end temp of the present invention is set as 860 DEG C ~ 900 DEG C, is preferably 880 DEG C.
3, coiling temperature setting
Coiling temperature major effect materials microstructure, performance and cold rolling after company move back recrystallization temperature and stamping formabilily.According to lower coiling temperature, material re-crystallizes temperature improves, and is unfavorable for the carrying out of subsequent anneal; If coiling temperature is higher, then can produces a large amount of iron scale batching rear surface, be unfavorable for follow-up pickling, product grain length is large, precipitate alligatoring, and stamping formabilily declines.Therefore, consider, coiling temperature of the present invention is set as 570 ~ 650 DEG C, is preferably 600 DEG C.
The invention provides cold-rolling process and the continuous annealing process of the said products.By above-mentioned coils of hot-rolled steel again uncoiling, remove after scale on surface and trimming through overpickling, on cold continuous rolling or cold rolling on reciprocating single stand mill after, crucial cold rolling draft is 40 ~ 60%.Annealing process is characterized as: the hard state band steel that rolls after cold rolling is 720 ~ 770 DEG C in the soaking zone annealing region of horizontal chamber oven continuous annealing furnace, and annealing time is 60-90s, does not carry out smooth after annealing.
4, cold rolling draft
Hot-dip aluminizing zinc band steel r value increases and monotone increasing with cold rolling draft, and along with the raising of cold rolling draft, the deformation energy stored in steel plate increases, and increases recrystallize motivating force, is conducive to the carrying out of annealing process.If but cold rolling draft is too high, obviously can increases cold rolling mill load, be unfavorable for the stably manufactured of rolling, especially, when producing the band steel of 2mm thickness specification, if draft is too high, require that hot rolling Thickness Ratio is thicker, welding machine for continuous rolling unit requires higher, adds production difficulty.Under the prerequisite ensureing the strength of materials, bending and forming performance, low draft is cold rolling reduces supplied materials thickness, because cold rolling front and back need each end to end segment length shearing coil of strip, therefore, reduces hot-rolled sheet thickness, can improve cold rolling lumber recovery, reduce cost.Consider, the preferably cold rolling draft of the present invention is 40 ~ 60%.
5, annealing temperature setting
In cold-rolled process, metal grain is elongated along the direction of distortion, and grain orientation changes, thus in polycrystal, form the texture of certain type, and when cold rolling, intracrystalline textural defect also can increase simultaneously.The tissue change that cold-rolled process causes is reflected to change mechanical property showing as structure sensitive character, as: the anisotropy etc. occurring work hardening (hardness, intensity raise, plasticity, toughness decline), mechanics and physicals.These defects and change all need to be eliminated by the recrystallization annealing process after rolling.Therefore, the necessary means of the recrystallization annealing cold rolling rear control of foot and change metal material tissue, texture and performance.After cold rolling roll recovery and recrystallization that hard steel experiences in annealing process and grain growth three processes all have influence on end properties.The setting of annealing temperature is generally recrystallization temperature, product performance demands scope two factors of considering band steel, for the cold rolling supplied materials of low draft, it is 720 ~ 770 DEG C that the present invention sets steel band in the annealing region of the soaking zone of horizontal chamber oven continuous annealing furnace, and band steel is 60-90s in the soaking zone time.
The present invention has following positively effect compared to existing technology:
The present invention by carbon content design, hot rolling finish to gauge, batch, low draft is cold rolling, horizontal chamber oven connects annealing technology optimum combination, under the prerequisite ensureing steel strength and bending and forming performance, lower cost, in batches, stably produce the cold rolling hot dipping steel plating of the think gauge with bending and forming excellent property feature, solve the technical problem of material bending and forming cracking, meet the demand of downstream user cost efficiency, the raising of lumber recovery, can production efficiency be increased substantially, reduce production cost.
Accompanying drawing explanation
Accompanying drawing 1 is the metallographic structure photo of the embodiment of the present invention 2.
Accompanying drawing 2 is the metallographic structure photo of the embodiment of the present invention 4.
Embodiment
This enforcement selects product grade to be DC51D+AZ, and specification is 2mm*1250mm, and below in conjunction with embodiment 1-4, the invention will be further described, as shown in table 1 ~ table 4.
Table 1 the present invention (weight percent %), surplus is Fe and inevitable impurity.
| Element | C | Si | Mn | P | S | Alt |
| The present invention | 0.021～0.1 | 0～0.05 | 0.1～0.4 | ≤0.015 | ≤0.015 | 0.025～0.065 |
| Embodiment 1 | 0.028 | 0.005 | 0.171 | 0.0067 | 0.0055 | 0.039 |
| Embodiment 2 | 0.035 | 0.0055 | 0.16 | 0.0085 | 0.0055 | 0.035 |
| Embodiment 3 | 0.053 | 0.0041 | 0.1568 | 0.0069 | 0.0267 | 0.053 |
| Embodiment 4 | 0.097 | 0.011 | 0.393 | 0.016 | 0.006 | 0.036 |
| Comparative example 1 | 0.021 | 0.0055 | 0.172 | 0.017 | 0.006 | 0.053 |
The continuously cast bloom of the chemical composition that obtains meeting the requirements by converter melting, thickness is 210 ~ 240mm, and width is 800 ~ 1300mm, and length is 5000 ~ 10000mm.Scale slab is delivered to process furnace and is reheated, and delivers to rolling on Continuous Heat tandem rolling mill after dephosphorization of coming out of the stove.After roughing milling train and the controlled rolling of finish rolling Continuous mill train, carry out back segment controlled cooling model, then batch, qualified coils of hot-rolled steel output.Technology controlling and process is in table 2.
Table 2 hot rolling technology controling parameters of the present invention
| Hot Rolling Parameters | Slab heating temperature (DEG C) | Finish rolling starts temperature (DEG C) | Finish rolling end temp (DEG C) | Coiling temperature (DEG C) |
| The present invention | 1180-1220 | 1000～1040 | 860～900 | 570～650 |
| Embodiment 1 | 1200 | 1010 | 880 | 580 |
| Embodiment 2 | 1200 | 1010 | 880 | 600 |
| Embodiment 3 | 1200 | 1010 | 880 | 620 |
| Embodiment 4 | 1200 | 1010 | 880 | 640 |
| Comparative example 1 | 1220 | 1030 | 900 | 680 |
By above-mentioned coils of hot-rolled steel again uncoiling after overpickling, reversible rolling or 5 Stands Cold Tandem Mills carry out cold rolling, cold rolling draft is 40 ~ 60%, and the steel band rolling hard state after cold rolling obtains the finished product cold-rolled steel strip of thickness 2mm through horizontal chamber oven continuous annealing.Annealing process is: steel band is 720 ~ 770 DEG C in the annealing region of the soaking zone of continuous annealing furnace, in the time of soaking zone be: 60-90s, without smooth after horizontal chamber oven continuous annealing, hot dip process (immersion routinely control of product band steel enters pot temperature, zinc pot temperature), plating, finally batch and obtain finished product.Process control parameter is in table 3.
Table 3 the present invention is cold rolling, annealing process controling parameters
| Cold rolling, annealing parameter | Cold rolling draft (%) | The temperature (DEG C) of soaking zone steel | Soaking zone time (s) |
| The present invention | 40～60 | 720～770 | 60-90 |
| Embodiment 1 | 43 | 750 | 72 |
| Embodiment 2 | 43 | 750 | 72 |
| Embodiment 3 | 50 | 730 | 72 |
| Embodiment 4 | 50 | 750 | 72 |
| Comparative example 1 | 63.6 | 770 | 72 |
The mechanical property of the cold rolling hot dip process product made from steel of the final think gauge utilizing aforesaid method to obtain is in table 4.
Table 4 product strength of the present invention and bending mechanical property
| Performance index | Yield strength (MPa) | Tensile strength (MPa) | 0a180 ° of bending |
| Embodiment 1 | 310 | 360 | Do not ftracture |
| Embodiment 2 | 315 | 365 | Do not ftracture |
| Embodiment 3 | 325 | 363 | Do not ftracture |
| Embodiment 4 | 339 | 406 | Do not ftracture |
| Comparative example 1 | 245 | 339 | Cracking |
As can be seen from above-described embodiment, 0a180 ° of buckling performance of comparative example 1 product cannot be stablized and meet bending and forming performance requriements; Product anti-cracking performance of the present invention is good, can meet bending and forming processing request, is specially adapted to the manufacture to the high product of bending performance requriements such as box body of electric cabinet, the stupefied bar in light steel construction roof.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (2)
1. a thickness is greater than the production method of the cold rolling hot dipping steel plating of 1.5mm bending and forming, smelt by following Ingredient percent: C:0.025 ~ 0.1%, Si:0 ~ 0.05%, Mn:0.1 ~ 0.4%, P≤0.015%, S≤0.015%, Alt:0.025 ~ 0.065%, surplus is Fe and inevitable impurity element, adopt desulfurizing iron successively, converter top bottom blowing, steel ladle bottom argon blowing or the refining of LF stove, low-carbon steel protecting slag blows Ar protective casting, bar plate heating stove heats, de-scaling, roughing, finish rolling, back segment controlled cooling model, batch acquisition coils of hot-rolled steel, then uncoiling again, through pickling, cold rolling, horizontal chamber oven continuous annealing, hot dip process, batch and obtain finished product, it is characterized in that: continuous casting steel billet Heating temperature is 1180 ~ 1220 DEG C, continuous or semicontinuous hot continuous rolling frame carries out rolling, after roughing, intermediate blank is after Coil Box rolling, uncoiling enters finish rolling first passage frame again, finish rolling start rolling temperature is 1000 ~ 1040 DEG C, finish rolling end temp is 860 ~ 900 DEG C, after finish rolling, coiling temperature is 570 ~ 650 DEG C, cold rolling draft is 40 ~ 60%, the hard state band steel that rolls after cold rolling is 720 ~ 770 DEG C in the soaking zone annealing region of continuous annealing furnace, band steel is 60-90s in the soaking zone time.
2. a kind of thickness as claimed in claim 1 is greater than the production method of the cold rolling hot dipping steel plating of 1.5mm bending and forming purposes, and it is characterized in that, finish rolling end temp is 880 DEG C, and after finish rolling, coiling temperature is 600 DEG C.
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| CN104480259B (en) * | 2015-01-05 | 2016-08-17 | 攀钢集团攀枝花钢铁研究院有限公司 | The continuous annealing method of cold rolling think gauge high strength steel plate |
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| CN106917041A (en) * | 2015-12-28 | 2017-07-04 | 上海梅山钢铁股份有限公司 | A kind of cold rolling hot-dip aluminizing zincium steel plate of think gauge and its manufacture method |
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