CN101787486B - Baking-aging resistant colored steel plate/strip and manufacturing method thereof - Google Patents
Baking-aging resistant colored steel plate/strip and manufacturing method thereof Download PDFInfo
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- CN101787486B CN101787486B CN2009100458447A CN200910045844A CN101787486B CN 101787486 B CN101787486 B CN 101787486B CN 2009100458447 A CN2009100458447 A CN 2009100458447A CN 200910045844 A CN200910045844 A CN 200910045844A CN 101787486 B CN101787486 B CN 101787486B
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Abstract
The invention relates to a baking-aging resistant colored steel plate/strip and a manufacturing method thereof. The base plate of the steel plate/strip comprises the following components in percentage by weight: less than or equal to 0.003 percent of C, 0.15 to 0.25 percent of Si, 0.5 to 0.8 percent of Mn, 0.06 to 0.08 percent of P, less than or equal to 0.01 percent of S, 0.04 to 0.07 percent of Ti, 0.0004 to 0.0008 percent of B, less than or equal to 0.003 percent of N, 0.025 to 0.065 percent of Al and the balance of Fe and unavoidable impurities. The manufacturing method comprises the steps of smelting, casting, hot rolling, cold rolling, annealing, electroplating and coating an organic membrane. The annealing process is performed in a continuous annealing furnace, wherein protective gas in the annealing furnace comprises the following components: 2 to 7 percent of hydrogen and the balance of nitrogen. The electroplating process is performed in a plating bath, wherein the current intensity is 6 to 21 kiloamperes; the zinc ion concentration in plating solution is 100 to 150 g/L; and the plating solution temperature is 50 to 55 DEG C. The baking temperature of the process of coating the organic membrane is 230 to 250 DEG C. The method has the advantages of simple production process and high operability.
Description
Technical field
The present invention relates to colored steel plate/strip and method of manufacture thereof, product particularly mainly is used as the colored steel plate/strip and the method for manufacture thereof of the baking-aging resistant of the appearance component that produces household appliances.
Background technology
With the colour coated plate of aluminium killed steel, when color coating applies operation, passed through the high bake of about 250 degree as substrate; The C of solid solution, N atom produce timeliness in the substrate; Precipitate into the crystal boundary place, form the Ke Shi air mass, cause the yield point elongation of material to raise; Maximum can reach about 60MPa, and the yield extension rate was from being 0 to bring up to more than 5% originally.When the user utilized colour coated plate to carry out the circular arc Bending Processing, the bending part cylindrical is drawn, extends to be increased comparatively fast, interior round pressurized; Make uniform flexural deformation become nonaffine deformation, material generation yield deformation effect is promptly because the Ke Shi air mass of C, the formation of N atom has very strong pinning effect to dislocation; It must just can make dislocation shake off the pinning of air mass under bigger applied stress, and in a single day dislocation has shaken off the pinning of air mass, just can under lower stress, move; After waiting to produce extension to a certain degree; Stress rises again immediately, causes producing the barring defective at the deflection larger part, and this defective has seriously influenced the aesthetic property of household electrical appliance appearance component.
Summary of the invention
The object of the present invention is to provide a kind of colored steel plate/strip and method of manufacture thereof of baking-aging resistant; Both can eliminate the mass defect of existing method; Need not to carry out any scrap build again; Under the prerequisite that does not increase production difficulty and cost, the quality in kind of baking-aging resistant color coating product reaches the like product advanced level.
Technical scheme of the present invention is:
The colored steel plate/strip of baking-aging resistant, its substrate composition weight percent is:
C：≤0.003％
Si：0.15％～0.25％
Mn：0.5％～0.8％
P：0.06％～0.08％
S：≤0.01％
Ti：0.04％～0.07％
B：0.0004％～0.0008％
N：≤0.003％
Al：0.025％～0.065％
All the other are Fe and inevitably are mingled with.
The present invention at first starts with from the composition of optimizing precoated substrate, designs the alloying constituent system of baking-aging resistant, and the C content in the control steel is below 0.003%; Improve Al content to 0.025%～0.065% in the steel, utilize the strong bonding force of Al and N to generate AlN, reduce solid solution N, suppress timeliness; An amount of interpolation Ti, B element fix the N element, also reduce solid solution N; Mn content is increased to 0.5%～0.8%, and the one, improve the intensity of material, the 2nd, make carbide, nitride more stable, suppress timeliness; Improve Si content, play the solution strengthening effect.
C: the C content in the steel is controlled at below 0.003%, makes the crystal boundary of C in the subsequent production process separate out ratio and reduces, and eliminates yield point elongation, prevents barring or slip line defective.
Si: little to the aging performance influence, have certain solution strengthening effect, be controlled at proper range.
Mn:,, favourable more to aging resistance so Mn content is high more because Mn makes carbide become more stable.Consider the influence to the strength of materials, Mn content is controlled at 0.5～0.8%.
P: solid solution has sclerization to steel in ferritic in steel, reduce unit elongation and punching performance, especially toughness of material can be along with the increase of P deterioration, embrittlement takes place.For the baking-aging resistant steel grade, the scope of P is controlled at 0.06～0.08%.
The S:S segregation is more serious, can reduce unit elongation, and the FeS fusing point of formation is low, produces embrittlement at the crystal boundary place, and general through adding the high MnS of Mn generation fusing point, the S content of this steel grade is controlled at below 0.01%.
Units such as Ti:Ti and N, C, S have strong avidity, particularly form fine separating out behind carbide, the oxide compound, and the steel plate characteristic is had very big influence, have improved the ageing of steel plate.The span of control of Ti content is 0.04%～0.07%.
B:B is preferential to combine to generate compound with N, the separating out of AlN in the inhibition course of hot rolling makes the damaging effect minimizing of AlN; B can fix N fully, improves timeliness.This steel grade has added micro-B, and scope is 0.0004%～0.0008%.
N:N has remarkable influence to mechanical property, and ys and tensile strength increase with the increase of N content, and unit elongation descends.N has tangible room temperature ageing effect, in order to improve aging performance, in steel, adds the elements strong with N avidity such as Al, Ti, B usually.N content is low more good more, but considers steel-making cost and actual operability, and the span of control of N is below 0.003%.
Al:Al is strong reductor, with N strong bonding force is arranged, and generates AlN, reduces solid solution N amount, improves ageing; Al can crystal grain thinning, improve toughness; Utilize AlN to the grain growth retarding effect, crystal grain thinning in annealing can improve deep drawability.Product A l content of the present invention is 0.025～0.065%.
The method of manufacture of the colored steel plate/strip of baking-aging resistant of the present invention, it comprises the steps:
1) by mentioned component smelting, secondary refining, be cast as slab;
2) hot rolling: finishing temperature 900-930 ℃, coiling temperature 580-620 ℃;
3) cold rolling: pickling, rolling;
4) anneal: shielding gas is arranged in the lehre, and annealing temperature 260-800 ℃, annealing time 250～400 seconds carries out smooth after the annealing;
5) electroplating processes: strength of current scope 6～21 KAs, plating bath zinc ion concentration 100～150g/l, 50～55 ℃ of bath temperatures;
6) apply organic membrane: storing temperature is 230～250 ℃.
Wherein, described hot rolling finishing temperature 900-930 ℃, coiling temperature 580-620 ℃.
Described shielding gas comprises hydrogen and nitrogen, and in volume percent, wherein hydrogen accounts for 2～7%, and surplus is a nitrogen.
Again, anneal of the present invention comprises thermal pretreatment, heat treated, all thermal treatment, jet cooling, roller deepfreeze and overaging processing.
The preheating temperature of described thermal pretreatment does not have and explicitly calls for 8～20 seconds warm up time.
730～800 ℃ of the Heating temperatures of described heat treated, 60～90 seconds heat-up times.
730～800 ℃ of the soaking temperatures of described equal thermal treatment, soaking time is no less than 40 seconds.
550～650 ℃ of described jet cooling temperatures, 6～20 seconds cooling times.
400～500 ℃ of the cold temperature of described roller, 6～20 seconds cooling times.
260～380 ℃ of described overaging treatment temperature, 100～180 seconds cooling times.
In addition, described smooth draft is 0.6～1.0%.
Adopt the coiling temperature of 900-930 ℃ finishing temperature, 580-620 ℃ at hot-rolled process, guarantee suitable, the steel substrate homogeneous microstructure of hot-rolled sheet grain size, satisfy follow-up cold rolling processing request, make the color coating finished product have certain intensity.Adopt 260-800 ℃ of annealing temperature in cold rolled annealed operation; Preheating, heating and all thermal treatment make that heterogeneous structure after cold roller and deformed is replied, recrystallize, make uniform crystal particlesization, obtain optimum processing characteristics and intensity; Generate carbide to the full extent; Reduce separating out of solid solution C, N, jet cooling, the overaging of roller cold-peace are handled remaining solid solution C, N are fully separated out, and improve the ageing resistance performance.Dislocation desity in the smooth minimizing steel matrix reduces because of machining deformation starts the barring probability that dislocation causes, further improves the ageing resistance performance.
Beneficial effect of the present invention
Compared with prior art; Technical characterstic of the present invention is to carry out suitable alloy system design, is equipped with follow-up suitable hot rolling and cold-rolling production process, need not to transform any production unit, need not production technique is done great adjustment; Particularly need not to carry out big smooth and back ageing treatment at the annealing unit; Just can produce the color coating product of baking-aging resistant, reduce production cost, improve the product price ratio and the market competitiveness.
Embodiment
Below in conjunction with embodiment the present invention is described further.Table 1 is the embodiment of the colored steel plate/strip substrate of baking-aging resistant of the present invention.
Table 1 embodiment component content (%)
| Embodiment | C | Si | Mn | P | S | Ti | B | N | Al | Fe |
| 1 | 0.0012 | 0.192 | 0.586 | 0.076 | 0.006 | 0.054 | 0.0006 | 0.0023 | 0.039 | Surplus |
| 2 | 0.0018 | 0.182 | 0.576 | 0.075 | 0.007 | 0.056 | 0.0008 | 0.0026 | 0.032 | Surplus |
| 3 | 0.0017 | 0.173 | 0.589 | 0.076 | 0.007 | 0.054 | 0.0007 | 0.0025 | 0.038 | Surplus |
| 4 | 0.0028 | 0.191 | 0.761 | 0.068 | 0.007 | 0.045 | 0.0006 | 0.0022 | 0.054 | Surplus |
| 5 | 0.0012 | 0.20 | 0.782 | 0.065 | 0.006 | 0.052 | 0.0006 | 0.0023 | 0.052 | Surplus |
Embodiment 1:
Invention steel A contains C:0.0012%, Si:0.192%, Mn:0.586%, P:0.076%, S:0.006%, Ti:0.054%, B:0.0006%, N:0.0023%, Al:0.039%; All the other are iron and unavoidable impurities; 921 ℃ of finishing temperatures; 594 ℃ of coiling temperatures, 766 ℃ of annealing soaking temperatures, ys (σ
0.2) be 260MPa, tensile strength is 419MPa, the yield extension rate is 0%, the yield point elongation height is 0MPa.Baking back performance, yield extension rate are 0%, the yield point elongation height is 0MPa.
Embodiment 2:
Invention steel B contains C:0.0018%, Si:0.182%, Mn:0.576%, P:0.075%, S:0.007%, Ti:0.056%, B:0.0008%, N:0.0026%, Al:0.032%; All the other are iron and unavoidable impurities; 921 ℃ of finishing temperatures; 592 ℃ of coiling temperatures, 781 ℃ of annealing soaking temperatures, ys (σ
0.2) be 283MPa, tensile strength is 428MPa, the yield extension rate is 0%, the yield point elongation height is 0MPa.Baking back performance, yield extension rate are 0%, the yield point elongation height is 0MPa.
Embodiment 3:
Invention steel C contains C:0.0017%, Si:0.173%, Mn:0.589%, P:0.076%, S:0.007%, Ti:0.054%, B:0.0007%, N:0.0025%, Al:0.038%; All the other are iron and unavoidable impurities; 927 ℃ of finishing temperatures; 602 ℃ of coiling temperatures, 775 ℃ of annealing soaking temperatures, ys (σ
0.2) be 243MPa, tensile strength is 422MPa, the yield extension rate is 0%, the yield point elongation height is 0MPa.Baking back performance, yield extension rate are 0%, the yield point elongation height is 0MPa.
Embodiment 4:
Invention steel D contains C:0.0028%, Si:0.191%, Mn:0.761%, P:0.068%, S:0.007%, Ti:0.045%, B:0.0006%, N:0.0022%, Al:0.054%; All the other are iron and unavoidable impurities; 910 ℃ of finishing temperatures; 593 ℃ of coiling temperatures, 774 ℃ of annealing soaking temperatures, ys (σ
0.2) be 281MPa, tensile strength is 437MPa, the yield extension rate is 0%, the yield point elongation height is 0MPa.Baking back performance, yield extension rate are 0%, the yield point elongation height is 0MPa.
Embodiment 5:
Invention steel E contains C:0.0012%, Si:0.20%, Mn:0.782%, P:0.065%, S:0.006%, Ti:0.052%, B:0.0006%, N:0.0023%, Al:0.052%; All the other are iron and unavoidable impurities; 924 ℃ of finishing temperatures; 608 ℃ of coiling temperatures, 763 ℃ of annealing soaking temperatures, ys (σ
0.2) be 256MPa, tensile strength is 425MPa, the yield extension rate is 0%, the yield point elongation height is 0MPa.Baking back performance, yield extension rate are 0%, the yield point elongation height is 0MPa.
The present invention adopts Ultra-low carbon, suitably improves the composition System Design of Si, Mn content and adopt high-temperature final rolling, low temperature coiling technique; Barring defective in the time of not only can eliminating the use of conventional aluminium killed steel color coating product; And guaranteed certain intensity; Satisfy user's requirement to aesthetic property when carrying out big radian bending, its ageing resistance level reaches highest level.Because production technique is optimized, suitably adjusted to technology of the present invention mainly through composition again; Need not to transform any equipment; Thereby be the method for a kind of technology production baking-aging resistant color coating product simple, with low cost, have very strong flexibility, economy and the feature of environmental protection.
Claims (4)
1. the colored steel plate/strip of baking-aging resistant, its substrate composition weight percent is:
C：≤0.003％
Si：0.15％～0.25％
Mn：0.5％～0.8％
P：0.06％～0.08％
S：≤0.01％
Ti：0.04％～0.07％
B：0.0004％～0.0008％
N：≤0.003％
Al：0.025％～0.065％
All the other are Fe and inevitably are mingled with.
2. the method for manufacture of the colored steel plate/strip of baking-aging resistant as claimed in claim 1, it comprises the steps:
1) by mentioned component smelting, secondary refining, be cast as slab;
2) hot rolling: finishing temperature 900-930 ℃, coiling temperature 580-620 ℃;
3) cold rolling: pickling, rolling;
4) anneal: shielding gas is arranged in the lehre, and annealing temperature 260-800 ℃, annealing time 250～400 seconds carries out smooth after the annealing;
Described anneal comprises thermal pretreatment, heat treated, all thermal treatment, jet cooling, roller deepfreeze and overaging processing; Wherein, the preheating temperature of thermal pretreatment does not have and explicitly calls for 8～20 seconds warm up time; 730～800 ℃ of the Heating temperatures of heat treated, 60～90 seconds heat-up times; 730～800 ℃ of the soaking temperatures of equal thermal treatment, soaking time is no less than 40 seconds; 550～650 ℃ of jet cooling temperatures, 6～20 seconds cooling times; 400～500 ℃ of the cold temperature of roller, 6～20 seconds cooling times; 260～380 ℃ of overaging treatment temperature, 100～180 seconds cooling times;
5) electroplating processes: strength of current scope 6～21 KAs, plating bath zinc ion concentration 100～150g/l, 50～55 ℃ of bath temperatures;
6) apply organic membrane: storing temperature is 230～250 ℃.
3. the method for manufacture of the colored steel plate/strip of baking-aging resistant as claimed in claim 2 is characterized in that, described shielding gas comprises hydrogen and nitrogen, and in volume percent, wherein hydrogen accounts for 2～7%, and surplus is a nitrogen.
4. the method for manufacture of the colored steel plate/strip of baking-aging resistant as claimed in claim 2 is characterized in that, described smooth draft is 0.6～1.0%.
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| TR201809068T4 (en) * | 2011-07-15 | 2018-07-23 | Tata Steel Ijmuiden Bv | Apparatus for producing annealed steels and a process for producing said steels. |
| CN103074546B (en) * | 2011-10-25 | 2014-12-10 | 上海梅山钢铁股份有限公司 | Cold-rolled strip steel for condenser tube of refrigerator and manufacturing method thereof |
| CN102605163A (en) * | 2012-01-10 | 2012-07-25 | 山西太钢不锈钢股份有限公司 | Drying method of continuous annealing furnace |
| DE102012110972B3 (en) * | 2012-11-14 | 2014-03-06 | Muhr Und Bender Kg | A method of making a product from flexibly rolled strip material and product from flexibly rolled strip material |
| CN107604141A (en) * | 2017-08-21 | 2018-01-19 | 河钢股份有限公司邯郸分公司 | A kind of anti-mild steel two applies two production methods for drying color coating timeliness |
| CN110656282A (en) * | 2018-06-29 | 2020-01-07 | 宝山钢铁股份有限公司 | Economical hot-dip galvanized color-coated substrate with excellent bending surface quality and manufacturing method thereof |
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| CN111850263B (en) * | 2020-06-22 | 2022-07-26 | 鞍钢蒂森克虏伯汽车钢有限公司 | Production method for improving aging resistance of continuous hot-dip galvanizing baking hardened steel plate |
| CN111850262B (en) * | 2020-06-22 | 2022-07-26 | 鞍钢蒂森克虏伯汽车钢有限公司 | Production method of ultra-low carbon baking hardening continuous hot-dip galvanized steel sheet |
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