CN103789608A - Cold-based ultra-high strength galvanized sheet for structures and production method thereof - Google Patents
Cold-based ultra-high strength galvanized sheet for structures and production method thereof Download PDFInfo
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Abstract
The invention discloses a cold-based ultra-high strength galvanized sheet for structures and a production method thereof. The cold-based ultra-high strength galvanized sheet comprises the following chemical components in percent by mass: 0.18-0.25% of C, 0.16-0.17% of Si, 0.3-0.4% of Mn, less than or equal to 0.012% of P, less than or equal to 0.009% of S, 0.016-0.035% of Al and the balance of Fe. The percent by mass of the Mn content in the galvanized sheet is only 0.3-0.4%, and other alloying elements are not added, so that the production cost is reduced; in order to ensure the mechanical property of the finished product, the cold rolling working procedure and the continuous annealing galvanization working procedure are correspondingly adjusted in the production process, so that the consumption of energy sources is reduced, and the production cost is further reduced; rapid-cooling equipment is not adopted, so that the equipment cost and the maintenance cost are not increased. The product is the galvanized sheet and has the characteristics of high strength, high ductility and high corrosivity. Upon inspection, the yield strength of the product is 600-700Mpa, the tensile strength of the product is 660-786Mpa, and the ductility of the product is 12-20%. The product meets the performance requirements of the cold-based ultra-high strength galvanized sheet.
Description
Technical field
The present invention relates to a kind of galvanized sheet and production method, cold based ultra-high strength degree galvanized sheet and production method thereof for especially a kind of structure.
Background technology
Owing to having higher corrosion resistance nature, zinc-plated structure replaces cold-rolling structure plate just gradually with plate, and more and more to height strengthening development.Structure improves product strength with increasing Mn alloy in the most employing of high-strength galvanized sheet production general carbon steel at present, or for superstrength galvanized sheet (yield strength is greater than 500MPa), in order to guarantee its processability, also adding other one or more alloying elements (as Nb, Cr etc.) improves final finished intensity and guarantees certain unit elongation, thereby increase production cost and worsened zinc-plated performance, even add more expensive fast cool equipment, increased equipment cost and maintenance cost.
Publication number CN101348880A discloses a kind of production method of high-strength galvanizing plate for structure, its actual product yield strength is distributed between 350～423MPa, strength level is little, although do not add other microalloy element, its Mn content requirement is also up to more than 0.9%.
Publication number CN102212666A discloses the production method of a kind of structure high-strength steel S550GD+Z, the consisting of of steel plate described in it: C 0.15～0.30%; Si 0.02～0.10%; Mn 1～2%; P 0.01～0.06%; S 0.01-0.06%.Product example yield strength is 575MPa, and tensile strength is 650 and 645MPa, unit elongation (A
80) be 7% and 8%.The high strength structure plate Mn content that utilizes the method to produce is higher, and actual finished product yield strength is less than 600MPa, and unit elongation (A80) only has 7%.
Publication number CN101956126A discloses a kind of cold base high-strength galvanized sheet and production method, this high-strength galvanized sheet finished product yield strength is 420～650MPa, but its alloy Mn content is also higher, be more than 0.65%, increase production cost, and when product yield strength is less than 600MPa, unit elongation is less than 10%.
Publication number CN101760694A discloses a kind of hot radical high-strength galvanized sheet and production method, and its product yield strength is less than 420MPa, and its alloy Mn content is more than 0.65%.
Publication number CN101871078A discloses a kind of super-high strength cold rolled steel and manufacture method thereof, it is by having added Cr and having promoted the Mn alloy that martensite forms, with the Si that improves martensite temper resistance, recycling fast cool equipment makes cooling rate reach 500 ℃/s to have produced super-high strength cold rolled steel, this processing requirement is added too much Mn and Si alloy, cold-reduced sheet is produced without too large impact, but can affect zinc-plated plating adhesion, be not suitable for zinc-plated production, and need to add the expensive follow-up tempering equipment of fast cold-peace, increased manufacturing cost.
Working method, publication number CN102071359A superstrength automobile structural steel and the production method thereof of publication number CN101928873A high strength and ultrahigh-strength steel plates, publication number CN102286701A thick plate for ultra-high-intensity boat body structure and production method thereof, all by adding Mn, Nb, one or more alloys raising intensity of Ti, Si, produce high-strength hot-rolled state product, increased manufacturing cost and be not suitable for galvanized sheet production technique.
The high tensile steel plate production technology more than relating to or form martensite with high rate of cooling and improve product strength by increasing fast cool equipment, or increase alloy part element and produce common intensity galvanized sheet, even add more alloying element and produce the strong As rolled of superelevation or cold rolling state sheet material, its result or insufficient strength, or increase manufacturing cost, the technique even having can have a strong impact on zinc-plated coating surface quality, is not suitable for galvanized sheet and produces.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of alloying element, cold based ultra-high strength degree galvanized sheet for structure that cost is low of not adding; The invention also discloses the production method of a kind of structure with cold based ultra-high strength degree galvanized sheet.
For solving the problems of the technologies described above, the quality proportioning of the chemical composition that the present invention takes is: C 0.18～0.25%; Si 0.06～0.17%; Mn 0.3～0.4%; P≤0.012%; S≤0.009%; Als 0.016～0.035%; Surplus is Fe.
The yield strength of galvanized sheet of the present invention is 600～700MPa, tensile strength 660～786MPa, and unit elongation is 12～20%.
Production method of the present invention comprises hot-rolled process, cold rolling process and zinc-plated operation, adopts the chemical composition of above-mentioned quality proportioning;
In described hot-rolled process, adopt CSP explained hereafter, process furnace tapping temperature is 1120～1170 ℃, 870 ± 20 ℃ of finishing temperatures, 570 ± 20 ℃ of coiling temperatures; Accumulative total draft in described cold rolling process is controlled at 50～70%; Described zinc-plated operation adopts U.S. steel connection method explained hereafter, and annealing heating and soaking temperature are 565 ± 5 ℃, heat-up time 119～239s, soaking time 23～46s.
Adopt the beneficial effect that produces of technique scheme to be: the present invention utilizes content to only have 0.3～0.4% Mn and the plain carbon stool that do not add any other alloying element is produced yield strength and is greater than 600MPa, cold based ultra-high strength degree galvanized sheet for more than 10% structure of unit elongation; Have the advantages that product cost is low, performance is good.
The inventive method is mainly utilized smelting-continuous casting and hot rolling-pickling-cold rolling-continuous annealing-zinc-plated long process features, do not add any alloying element, do not use any fast cool equipment, by optimizing Composition Design, simultaneously correspondingly adjust hot rolling in long flow process operation, cold rolling and connect strip zinc technology parameter, utilize content to only have 0.3～0.4% Mn and the plain carbon stool that do not add any other alloying element is produced yield strength and is greater than cold based ultra-high strength degree galvanized sheet for more than 10% structure of 600MPa, unit elongation.Compared with prior art, advantage of the present invention is: 1. in product composition proportioning, Mn content only has 0.3～0.4%, and does not add other alloying element, has reduced production cost; 2. for guaranteeing finished product mechanical property, in production process, to cold rolling and connect strip zinc operation and carried out corresponding adjustment, energy consumption is reduced, further reduce production cost; 3. do not adopt any fast cool equipment, do not increase equipment cost and maintenance cost; 4. product is galvanized sheet, has the feature of high strength, high-elongation and high corrosion resistance.Be 600～700MPa through check product yield strength of the present invention, tensile strength 660～786MPa, unit elongation is 12～20%, meets the performance requriements of cold based ultra-high strength degree galvanized sheet.Therefore, when the inventive method reduces manufacturing cost in process of production, product performance have met the market requirement, can create considerable economic benefit for enterprise.
Embodiment
Below in conjunction with specific embodiment, the present invention is further detailed explanation.
This structure with cold based ultra-high strength degree galvanized sheet and production method thereof mainly improve following several aspect:
1. for reducing costs, galvanized sheet chemical composition is optimized to proportioning, in composition, does not add expensive alloying element, reduced Mn constituent content, only retain 0.3～0.4%.Suitably reduce the content of P, S in impurity according to smelting ability in addition, for the subsequent forming processing of zinc-plated finished product provides assurance.In addition, common galvanized sheet has strictly limited Si upper content limit, reduces Si percentage composition as far as possible, avoids Sandelin effect to guarantee surface quality and the coating adhesion of zinc-plated finished product.But chamber test by experiment, when Si content is no more than 0.17%, can not exert an influence to galvanized sheet surface quality and coating tissue, has therefore retained part Si, and this part content needn't deliberately be removed in smelting process, has increased product intensity.
2. present method Hot Rolling Plate Production adopts CSP technique, and the hot rolling technology of conventional zinc-plated substrate, for meeting the demand under follow-up cold rolling, adopt and reduce grain size number, the technique of coarsened grain, general finishing temperature is set as 890 ± 20 ℃, and coiling temperature is 660 ± 20 ℃.Even for improve cold rolling product intensity, reduce bar plate heating stove tapping temperature be 1100～1150 ℃ and reduce finishing temperature be 850 ± 20 ℃ to control austenite recrystallization behavior.But adopt above-mentioned technique all can not meet the requirement of cold rolling finished product high strength and high-elongation, therefore present method is on the basis of CSP hot rolling technology, improving bar plate heating stove tapping temperature is 1120～1170 ℃, and retaining high finishing temperature is 870 ± 20 ℃, is 570 ± 20 ℃ but reduce coiling temperature.High Heating temperature is conducive to the dissolving of the second phase particles such as carbide, AlN in strand, the more important thing is that to impel grain structure even, adopts lower coiling temperature after rolling, refinement ferrite crystal grain and avoid the gathering of carbide.
3. cold rolling effect is to be reduced to the thickness going for steel, has produced cold rolling work hardening simultaneously and can make to obtain certain mechanical property with steel.Present method, by test, is controlled at 50～70% by cold rolling draft.Cold rolling rear metal structure is out of shape through External Force Acting, and crystal grain elongates broken, and the inner dislocation of crystal boundary and crystal grain increases, and makes the mechanical property of chill volume have intensity high, and yield tensile ratio is high, the feature that unit elongation is low.Under present method process acts, the deformation extent of product reduces, and crystal grain defect reduces relatively, has suitably retained high-intensity feature simultaneously.
4. adopt U.S. steel connection method to utilize chill volume to produce galvanized sheet, need carry out anneal, the too high or overlong time of annealing heating temperature and soaking temperature, can impel the inhomogeneous of ferrite crystal grain to grow up, and dislocation desity reduces, and does not reach the intensity of zinc-plated finished product requirement; If anneal is insufficient, easily cause product unit elongation too low, subsequent forming poor processability.Mainly in conjunction with the adjustment of chemical composition proportioning, hot rolling technology and cold rolling draft and chamber test by experiment, optimize zinc-plated annealing parameter and be: heating and soaking temperature are 565 ± 5 ℃, heat-up time 119～239s, soaking time 23～46s.Zinc-plated finished product under this technique, more than yield strength has reached 600MPa, processability has also obtained remarkable improvement simultaneously.
Embodiment 1: this structure adopts composition and the production method of following proportioning with cold based ultra-high strength degree galvanized sheet.
Following (mass percent): the C 0.18% of superstrength galvanized sheet chemical composition proportioning; Si 0.06%; Mn 0.36%; P 0.012%; S 0.0078%; Als 0.016%; Fe surplus.
Main processes and parameter: in hot-rolled process, 1130 ℃ of process furnace tapping temperatures, 886 ℃ of finishing temperatures, 585 ℃ of coiling temperatures; Cold rolling accumulative total draft 65%; 563 ℃ of annealing heating temperature in zinc-plated operation, heat-up time 160s, 565 ℃ of soaking temperatures, soaking time 35s.
Gained superstrength galvanized sheet finished product yield strength 610MPa, tensile strength 665MPa, unit elongation 19%.
Embodiment 2: this structure adopts composition and the production method of following proportioning with cold based ultra-high strength degree galvanized sheet.
Following (mass percent): the C 0.23% of superstrength galvanized sheet chemical composition proportioning; Si 0.07%; Mn 0.30%; P 0.008%; S 0.009%; Als 0.02%; Fe surplus.
Main processes and parameter: in hot-rolled process, 1140 ℃ of process furnace tapping temperatures, 870 ℃ of finishing temperatures, 580 ℃ of coiling temperatures; Cold rolling accumulative total draft 60%; 563 ℃ of annealing heating temperature in zinc-plated operation, heat-up time 150s, 565 ℃ of soaking temperatures, soaking time 30s.
Gained superstrength galvanized sheet finished product yield strength 665MPa, tensile strength 730MPa, unit elongation 13.5%.
Embodiment 3: this structure adopts composition and the production method of following proportioning with cold based ultra-high strength degree galvanized sheet.
Following (mass percent): the C 0.189% of superstrength galvanized sheet chemical composition proportioning; Si 0.16%; Mn 0.4%; P 0.01%; S 0.007%; Als 0.033%; Fe surplus.
Main processes and parameter: in hot-rolled process, 1150 ℃ of process furnace tapping temperatures, 880 ℃ of finishing temperatures, 583 ℃ of coiling temperatures; Cold rolling accumulative total draft 58%; 565 ℃ of annealing heating temperature in zinc-plated operation, heat-up time 135s, 565 ℃ of soaking temperatures, soaking time 26s.
Gained superstrength galvanized sheet finished product yield strength 680MPa, tensile strength 776MPa, unit elongation 13%.
Embodiment 4: this structure adopts composition and the production method of following proportioning with cold based ultra-high strength degree galvanized sheet.
Following (mass percent): the C 0.24% of superstrength galvanized sheet chemical composition proportioning; Si 0.09%; Mn 0.3%; P 0.009%; S 0.007%; Als 0.016%; Fe surplus.
Main processes and parameter: in hot-rolled process, 1135 ℃ of process furnace tapping temperatures, 875 ℃ of finishing temperatures, 555 ℃ of coiling temperatures; Cold rolling accumulative total draft 50%; 568 ℃ of annealing heating temperature in zinc-plated operation, heat-up time 200s, 565 ℃ of soaking temperatures, soaking time 40s.
Gained superstrength galvanized sheet finished product yield strength 660MPa, tensile strength 710MPa, unit elongation 15%.
Embodiment 5: this structure adopts composition and the production method of following proportioning with cold based ultra-high strength degree galvanized sheet.
Following (mass percent): the C 0.21% of superstrength galvanized sheet chemical composition proportioning; Si 0.10%; Mn 0.32%; P 0.012%; S 0.006%; Als 0.035%; Fe surplus.
Main processes and parameter: in hot-rolled process, 1135 ℃ of process furnace tapping temperatures, 870 ℃ of finishing temperatures, 571 ℃ of coiling temperatures; Cold rolling accumulative total draft 56%; 561 ℃ of annealing heating temperature in zinc-plated operation, heat-up time 198s, 565 ℃ of soaking temperatures, soaking time 39s.
Gained superstrength galvanized sheet finished product yield strength 665MPa, tensile strength 725MPa, unit elongation 14%.
Embodiment 6: this structure adopts composition and the production method of following proportioning with cold based ultra-high strength degree galvanized sheet.
Following (mass percent): the C 0.23% of superstrength galvanized sheet chemical composition proportioning; Si 0.09%; Mn 0.4%; P 0.009%; S 0.006%; Als 0.026%; Fe surplus.
Main processes and parameter: in hot-rolled process, 1170 ℃ of process furnace tapping temperatures, 890 ℃ of finishing temperatures, 589 ℃ of coiling temperatures; Cold rolling accumulative total draft 70%; 568 ℃ of annealing heating temperature in zinc-plated operation, heat-up time 121s, 569 ℃ of soaking temperatures, soaking time 24s.
Gained superstrength galvanized sheet finished product Yield strength 700 MPa, tensile strength 786MPa, unit elongation 12%.
Embodiment 7: this structure adopts composition and the production method of following proportioning with cold based ultra-high strength degree galvanized sheet.
Following (mass percent): the C 0.25% of superstrength galvanized sheet chemical composition proportioning; Si 0.06%; Mn 0.32%; P 0.01%; S 0.007%; Als 0.028%; Fe surplus.
Main processes and parameter: in hot-rolled process, 1120 ℃ of process furnace tapping temperatures, 850 ℃ of finishing temperatures, 551 ℃ of coiling temperatures; Cold rolling accumulative total draft 58%; 565 ℃ of annealing heating temperature in zinc-plated operation, heat-up time 238s, 560 ℃ of soaking temperatures, soaking time 44s.
Gained superstrength galvanized sheet finished product yield strength 609MPa, tensile strength 670MPa, unit elongation 20%.
Embodiment 8: this structure adopts composition and the production method of following proportioning with cold based ultra-high strength degree galvanized sheet.
Following (mass percent): the C 0.20% of superstrength galvanized sheet chemical composition proportioning; Si 0.17%; Mn 0.38%; P 0.011%; S 0.0065%; Als 0.022%; Fe surplus.
Main processes and parameter: in hot-rolled process, 1165 ℃ of process furnace tapping temperatures, 880 ℃ of finishing temperatures, 589 ℃ of coiling temperatures; Cold rolling accumulative total draft 50%; 560 ℃ of annealing heating temperature in zinc-plated operation, heat-up time 239s, 565 ℃ of soaking temperatures, soaking time 46s.
Gained superstrength galvanized sheet finished product yield strength 629MPa, tensile strength 690MPa, unit elongation 16%.
Claims (4)
1. a cold based ultra-high strength degree galvanized sheet for structure, is characterized in that, the quality proportioning of its chemical composition is: C 0.18～0.25%; Si 0.06～0.17%; Mn 0.3～0.4%; P≤0.012%; S≤0.009%; Als 0.016～0.035%; Surplus is Fe.
2. cold based ultra-high strength degree galvanized sheet for structure according to claim 1, is characterized in that: the yield strength of described galvanized sheet is 600～700MPa, tensile strength 660～786MPa, and unit elongation is 12～20%.
3. a production method for cold based ultra-high strength degree galvanized sheet for structure, it comprises hot-rolled process, cold rolling process and zinc-plated operation, it is characterized in that, the quality proportioning of described chemical composition is: C 0.18～0.25%; Si 0.06～0.17%; Mn 0.3～0.4%; P≤0.012%; S≤0.009%; Als 0.016～0.035%; Surplus is Fe;
In described hot-rolled process, adopt CSP explained hereafter, process furnace tapping temperature is 1120～1170 ℃, 870 ± 20 ℃ of finishing temperatures, 570 ± 20 ℃ of coiling temperatures; Accumulative total draft in described cold rolling process is controlled at 50～70%; Described zinc-plated operation adopts U.S. steel connection method explained hereafter, and annealing heating and soaking temperature are 565 ± 5 ℃, heat-up time 119～239s, soaking time 23～46s.
4. the production method of cold based ultra-high strength degree galvanized sheet for structure according to claim 3, is characterized in that: the yield strength of described galvanized sheet is 600～700MPa, tensile strength 660～786MPa, and unit elongation is 12～20%.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103993150A (en) * | 2014-05-30 | 2014-08-20 | 广东华冠钢铁有限公司 | Production process of hot-dip aluminum-zinc steel plate |
| CN109487193A (en) * | 2018-12-20 | 2019-03-19 | 唐山钢铁集团高强汽车板有限公司 | Inexpensive 600MPa or more high strength steel product and its production method |
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Application publication date: 20140514 |