CN103451519A - Cold rolling hot-dip steel with thickness greater than 1.5 mm for folding forming and production method thereof - Google Patents
Cold rolling hot-dip steel with thickness greater than 1.5 mm for folding forming and production method thereof Download PDFInfo
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Abstract
The invention relates to a cold rolling hot-dip steel with thickness greater than 1.5 mm for folding forming and a production method thereof, and mainly solves the technical problem that folding cracking of cold rolling hot-dip steel of thick specification can not be solved through annealing speed reduction or annealing temperature raising in the prior art. The method comprises the steps of: smelting according to components; carrying out molten iron desulphurization, converter top-bottom blowing, ladle bottom argon blowing or LF furnace refining, mild steel protection slag Ar blowing protective atmosphere pouring, slab heating furnace heating, de-scaling, rough rolling, finish rolling, post-segment control cooling and reeling to obtain a hot rolled strip; and then carrying out uncoiling, acid pickling, cold rolling, horizontal-chamber furnace continuous annealing, hot dipping and reeling to obtain a finished product. The continuous casting slab heating temperature is 1180-1220 DEG C; after rough rolling, an intermediate blank is rolled by a hot coil box, and uncoiled and sent into a first frame for finish rolling; rolling temperature of finish rolling is 1000-1040 DEG C, and the finishing temperature of finish rolling is 860-900 DEG C; the reeling temperature is 570-650 DEG C; the cold rolling reduction is 40-60%; the isothermal segment temperature for continuous annealing of cold-rolled strip steel in a hard state in the horizontal-chamber furnace is 720-770 DEG C; and the strip steel stays at the isothermal segment for 60-90 s. The product provided by the invention is mainly used in manufacture of industrial regulator cubicle casing and roof fillet of light steel building, etc.
Description
Technical field
The present invention relates to a kind of cold rolling hot dipping steel plating and manufacture method thereof, cold rolling hot dipping steel plating and production method thereof that particularly a kind of bending and forming is used.
Background technology
In building, industrial electric industry, increasing for the usage quantity of the cold rolling hot dipping steel plating of thick specification of bending and forming, all use in a large number this class material such as products such as stupefied of industrial electro gas holder casings, light steel building roof.
With traditional hot-rolled steel sheet, sandblast steel plate, pickled plate, compare, cold rolling hot dip process steel plate has that forming property is good, dimensional precision is high, performance is more even.Along with the raising that society requires environmental protection, material economy, in building, industrial electric industry, more multiple enterprises requires to use cold rolling hot dipping steel plating to substitute traditional hot-rolled steel sheet, sandblast steel plate, pickled plate.For guaranteeing structural strength, the rigidity of structural part, the cold rolling hot dipping steel plating of thick specification is used widely.The cold rolling hot dipping steel plating of thick specification is being used, is adding man-hour, generally all want bending and forming, particularly wide-angle bending and forming, higher to intensity, the toughness reguirements of material, the bad cracking during bending phenomenon that there will be of the Properties Control of material, have a strong impact on the safe handling of structural part.
For guaranteeing that material has bending and forming performance preferably, traditional method is to reduce yield strength, raising unit elongation.Concerning the cold rolling hot dipping steel plating of thick specification, general reduction annealing speed or the raising annealing temperature selected guarantees that material obtains lower yield strength, but the unit elongation that this can not obviously improve material, even also can reduce unit elongation sometimes, cause still existing a certain proportion of product cracking during bending.The patent document of Chinese Patent Application No. CN 200710093976.8 has been announced a kind of production technique that is applicable to hot-dip aluminizing zincium steel plate/belt for deep drawing, by its invention case 2, calculate, when production>1.2mm hot-dip aluminizing zinc product, for guaranteeing the material low yield strength, the soaking zone temperature guarantees under 850 ℃ of conditions, require annealing speed 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 thick specification, although can solve the cracking during bending problem, product strength is lower, production cost is higher, can't meet user's service requirements and economy requirement.
Cold rolling draft affects punching press, the forming property of material, the cold rolling draft of the best that in June, 2000 Chinese periodical " steel vanadium titanium " the 21st the 2nd phase of volume " impact of cold rolling draft on carbon aluminium-killed steel cold-reduced sheet deep drawability " description material obtains good deep drawability 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 increases with the increase of cold rolling draft.At present, the cold rolling draft of the cold rolling hot dip process product made from steel of the thick specification of enterprise generally is not less than 60% both at home and abroad, for example, the product of thickness 2mm is generally with 5 or the hot-rolled sheet pickling of 5.5mm, cold rolling, draft is respectively 60%, 63.6%, need thicker hot-rolled sheet but improve again draft, higher to the rolling power requirement of cold-rolling equipment.Because draft is lower, the forming property of material descends obviously, and therefore, the cold rolling hot dip process product made from steel of thick specification generally is not suitable for deep hole pinching.
Summary of the invention
The objective of the invention is to meet lower cost, in batches, the cold rolling hot dip process product made from steel of the thick specification demand of stably manufactured bending and forming purposes, a kind of cold rolling hot dipping steel plating of thick specification and manufacture method thereof of bending and forming excellent property are provided, solve the cold rolling hot dipping steel plating of existing thick specification because Composition Design and hot rolling, cold-rolling process aspect exist, occur while causing the bending and forming course of processing that the technical problem of cracking during bending easily occurs material.
The technical solution used in the present invention is:
A kind of thickness is greater than the cold rolling hot dipping steel plating that the 1.5mm bending and forming is used, 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.
Bending and forming of the present invention is limited to the reasons are as follows in above-mentioned scope by the chemical composition of cold rolling hot dipping steel plating:
Carbon: the C content in steel, be conducive to low-cost suitable yield strength and the higher unit elongation of obtaining, guarantee the economy of forming property, intensity and the material of material.Suitably increase the C content in steel, can reduce Mn content, the materials'use performance does not descend, and the economy of material further improves.Therefore, C content range of the present invention is set as 0.025～0.1%;
Silicon: the Si content in the soft steel aluminium killed steel increases, plasticity and the forming property of infringement cold-rolled steel sheet.The too low cost that can improve the steel-making refining procedure of Si content requirement.Technical solution of the present invention is set Si content 0～0.05%;
Manganese: Mn mainly exists with solid solution condition in steel, and Main Function is raising intensity, if but the Mn too high levels is unfavorable to forming property index r value, and cost increases, economy descends.It is 0.1～0.4% that technical solution of the present invention is set the Mn content range;
Phosphorus: P generally is solid-solubilized in ferrite, there is very strong solution strengthening effect, phosphorus also has serious segregation tendency, and diffusion is 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 descend, forming property degenerates.Consider actual dephosphorizing capacity, technical solution of the present invention is set P≤0.015%;
Sulphur: in the bending deformation process, at first stress concentration makes sulfide inclusion split, or makes to be mingled with to separate with metallic matrix and produce micro-hole, and these holes are constantly grown up with the distortion process, then further expand and cause the steel plate cracking.For guaranteeing certain forming property, technical solution of the present invention is set S≤0.015%;
Aluminium: due to Si content seldom, steel-making adopts aluminium deoxidation, needs aluminium content to be not less than 0.015%.Abundant in order to guarantee deoxidation, be limited to 0.025% under setting.But, when Al measures when too high, can increase cost of alloy, and, to the continuous casting casting cycle is had to certain influence, the oxide compound Al2O3 that also can form in addition too much deoxidation products Al is 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 that the 1.5mm bending and forming uses, by following composition quality per-cent, smelt: 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 successively desulfurizing iron, converter top bottom blowing, steel ladle bottom argon blowing or the refining of LF stove, low-carbon steel protecting slag blow Ar protective casting, bar plate heating stove heating, de-scaling, roughing, finish rolling, back segment control cooling, batch the 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:
1, the carbon content in steel is set
C content in steel, be conducive to low-cost suitable yield strength and the higher unit elongation of obtaining, and guarantees the economy of forming property, intensity and the material of material.Suitably increase the C content in steel, can reduce Mn content, reduce smelting cost, the materials'use performance does not descend, and the economy of material further improves.Therefore, C content range of the present invention is set as 0.025～0.1%; The preferred content target value of carbon is 0.03～0.04%.
2, the finish rolling end temp is set
For preventing that finish rolling is in the two-phase region rolling, the height that finishing temperature will be set; But consider the refine austenite grain fineness number and reduce the factor that precipitate is grown up, finishing temperature again can not be too high.Therefore, consider, finish rolling end temp of the present invention is set as 860 ℃～900 ℃, is preferably 880 ℃.
3, coiling temperature is set
The tissue of coiling temperature major effect material, performance and cold rolling after company move back recrystallization temperature and stamping performance.If adopt lower coiling temperature, the material recrystallization temperature improves, and is unfavorable for the carrying out of subsequent anneal; If coiling temperature is higher, can produce a large amount of iron scales batching rear surface, be unfavorable for follow-up pickling, the product grain length is large, the precipitate alligatoring, stamping performance descends.Therefore, consider, coiling temperature of the present invention is set as 570～650 ℃, is preferably 600 ℃.
The invention provides cold-rolling process and the continuous annealing process of the said products.By above-mentioned coils of hot-rolled steel uncoiling again, after overpickling is removed scale on surface and trimming, on cold continuous rolling or after cold rolling on reciprocating single stand mill, 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 ℃ in the soaking zone annealing region of horizontal chamber oven continuous annealing furnace, and annealing time is 60-90s, after annealing, does not carry out smooth.
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 of storing in steel plate increases, and increases the recrystallize motivating force, is conducive to the carrying out of annealing process.But if cold rolling draft is too high, can obviously increase the 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 the hot rolling Thickness Ratio thicker, welding machine for the continuous rolling unit is had relatively high expectations, and has increased production difficulty.Under the prerequisite that guarantees the strength of materials, bending and forming performance, the low cold rolling supplied materials thickness that reduced of draft, because cold rolling front and back need to shear each segment length end to end of coil of strip, therefore, reduce hot-rolled sheet thickness, can improve cold rolling lumber recovery, reduced cost.Consider, the present invention preferably cold rolling draft is 40～60%.
5, annealing temperature is set
In cold-rolled process, metal grain is elongated along the direction of distortion, and grain orientation changes, thereby forms the texture of certain type in polycrystal, and when cold rolling, intracrystalline textural defect also can increase simultaneously.The tissue variation that cold-rolled process causes is reflected on mechanical property the change that shows as structure sensitive property matter, as: the anisotropy of work hardening (hardness, intensity raise, and plasticity, toughness descend), mechanics and physicals etc. appears.These defects and variation 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.Recovery and recrystallization and three processes of grain growth that hard steel experiences in annealing process of rolling after cold rolling all have influence on end properties.The setting of annealing temperature is generally two factors of recrystallization temperature, product performance demands scope that consider with steel, for the cold rolling supplied materials of low draft, it is 720～770 ℃ in the annealing region of the soaking zone of horizontal chamber oven continuous annealing furnace that the present invention sets steel band, and the 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, the low optimum combination that draft is cold rolling, horizontal chamber oven connects annealing technology, under the prerequisite that guarantees steel strength and bending and forming performance, lower cost, in batches, stably produce the cold rolling hot dipping steel plating of the thick specification with bending and forming excellent property characteristics, solved the technical problem of material bending and forming cracking, met the demand of downstream user cost efficiency, the raising of lumber recovery, can increase substantially production efficiency, reduce production cost.
The accompanying drawing explanation
The metallographic structure photo that accompanying drawing 1 is the embodiment of the present invention 2.
The metallographic structure photo that accompanying drawing 2 is the embodiment of the present invention 4.
Embodiment
It is DC51D+AZ that product grade is selected in this enforcement, 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 |
By converter melting obtain the meeting the requirements continuously cast bloom of chemical composition, thickness is 210～240mm, and width is 800～1300mm, and length is 5000～10000mm.The scale slab is delivered to process furnace and is reheated, and delivers to rolling on the Continuous Heat tandem rolling mill after the dephosphorization of coming out of the stove.After roughing milling train and the controlled rolling of finish rolling tandem rolling unit, carry out back segment control cooling, then batched qualified coils of hot-rolled steel output.Technology controlling and process is in Table 2.
Table 2 hot rolling technology of the present invention is controlled parameter
| Hot Rolling Parameters | Slab heating temperature (℃) | Finish rolling start temperature (℃) | The finish rolling end temp (℃) | Coiling temperature (℃) |
| 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 uncoiling again after overpickling, on reversible rolling or 5 Stands Cold Tandem Mills, carry out cold rolling, cold rolling draft is 40～60%, and the steel band process horizontal chamber oven continuous annealing of rolling hard state after cold rolling obtains the finished product cold-rolled steel strip of thickness 2mm.Annealing process is: steel band is 720～770 ℃ in the annealing region of the soaking zone of continuous annealing furnace, time at soaking zone is: 60-90s, without smooth, finally batch and obtain finished product after horizontal chamber oven continuous annealing, hot dip process (immersion control of product band steel routinely enters pot temperature, zinc pot temperature), plating.Process control parameter is in Table 3.
Table 3 the present invention is cold rolling, annealing process is controlled parameter
| Cold rolling, annealing parameter | Cold rolling draft (%) | The temperature of soaking zone steel (℃) | The 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 final thick specification that utilizes 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 |
From above-described embodiment, can find out, 0a180 ° of buckling performance of comparative example 1 product can't be stablized and meet the bending and forming performance requriements; Product anti-cracking performance of the present invention is good, can meet the bending and forming processing request, is specially adapted to the manufacture of the high product to the bending performance requriements such as stupefied of box body of electric cabinet, light steel building 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 requirement of the present invention.
Claims (4)
1. a thickness is greater than the cold rolling hot dipping steel plating that the 1.5mm bending and forming is used, its chemical composition mass 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.
2. a kind of thickness as claimed in claim 1 is greater than the cold rolling hot dipping steel plating that the 1.5mm bending and forming is used, and it is characterized in that, in steel, the carbon mass percent is 0.03～0.04%.
3. a thickness is greater than the production method of the cold rolling hot dipping steel plating that the 1.5mm bending and forming uses, by following composition quality per-cent, smelt: 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 successively desulfurizing iron, the converter top bottom blowing, steel ladle bottom argon blowing or the refining of LF stove, low-carbon steel protecting slag blows the Ar protective casting, the bar plate heating stove heating, de-scaling, roughing, finish rolling, back segment is controlled cooling, batch the 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: the continuous casting steel billet Heating temperature is 1180～1220 ℃, carry out rolling on continuous or semicontinuous hot continuous rolling frame, after roughing, intermediate blank is after the Coil Box rolling, uncoiling enters finish rolling the first passage frame again, the finish rolling start rolling temperature is 1000～1040 ℃, the finish rolling end temp is 860～900 ℃, after finish rolling, coiling temperature is 570～650 ℃, cold rolling draft is 40～60%, the hard state band steel that rolls after cold rolling is 720～770 ℃ in the soaking zone annealing region of continuous annealing furnace, the band steel is 60-90s in the soaking zone time.
4. a kind of thickness as claimed in claim 3 is greater than the production method of the cold rolling hot dipping steel plating of 1.5mm bending and forming purposes, it is characterized in that, the finish rolling end temp is 880 ℃, and after finish rolling, coiling temperature is 600 ℃.
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