CN101597674A - A kind of continuous annealing method of DC 01 steel plate with low yield and high tensile strength for automobiles - Google Patents
A kind of continuous annealing method of DC 01 steel plate with low yield and high tensile strength for automobiles Download PDFInfo
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- CN101597674A CN101597674A CNA2009100881465A CN200910088146A CN101597674A CN 101597674 A CN101597674 A CN 101597674A CN A2009100881465 A CNA2009100881465 A CN A2009100881465A CN 200910088146 A CN200910088146 A CN 200910088146A CN 101597674 A CN101597674 A CN 101597674A
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Abstract
A kind of continuous annealing method of DC 01 steel plate with low yield and high tensile strength for automobiles belongs to the metal material processing field.The chemical ingredients mass percent of steel plate is: C, 0.02-0.04%; Mn, 0.2-0.35%; Si ,≤0.03%; P ,≤0.010%; S ,≤0.010%; Als, 0.02-0.06%, N, 0.0020～0.0050, surplus is Fe; Hot-rolled process parameter: Heating temperature, 1250 ± 30 ℃; Finishing temperature, 930 ± 20 ℃; Coiling temperature, 730 ± 20 ℃; Cold rolling draft: be controlled at 75-85%; Soaking time: 50～100s; Annealing temperature: 780 ± 20 ℃; Slow cooling section temperature out: 675 ± 20 ℃; Fast cold section temperature out: 400 ± 20 ℃; Overaging temperature: 350 ± 20 ℃; Smooth unit elongation: 0.9 ± 0.3%.Advantage is, the steel plate of being produced has that yield strength is low, tensile strength is high, forming property is good, quality product is high, brings considerable economic.
Description
Technical field
The invention belongs to the metal material processing field, particularly relate to a kind of continuous annealing method of DC 01 steel plate with low yield and high tensile strength for automobiles, be applicable to low carbon aluminum-killed steel plate (DC01).
Background technology
Low carbon aluminum-killed steel plate (DC01), bell-type annealing production commonly used, with the renewal of production unit, existing a large amount of continuous annealing process productions of adopting, it is used for automotive industry, household electrical appliances industry and building field etc. more.By the requirement of GB/T 5213-2001 to similar steel grade, its composition is: C ,≤0.08%; Mn ,≤0.4%; Si ,≤0.03%; P ,≤0.020%; S ,≤0.025%; Als, 0.02-0.07%, surplus is Fe.GB is to its yield strength requirement≤240MPa, and tensile strength requires 270～350MPa, n
90〉=1.8, r
90〉=1.6.Among the Europe superscript EN 10130-2006 its composition is required to be C ,≤0.12%; Mn ,≤0.60%; S ,≤0.45%; P ,≤0.045%, its performance requriements is yield strength Re≤280MPa, tensile strength Rm270～410MPa.Usually adopt constituent contents such as control C, Mn etc. to satisfy the requirement of tensile strength for this steel grade, the rising that often brings yield strength, yield tensile ratio (ratio of yield strength and tensile strength) improves, and the reduction of r value is unfavorable for the drawing of auto sheet.In order to obtain suitable yield tensile ratio, need control reasonable component, hot rolling technology, cold rolling draft, annealing process, smooth unit elongation etc., thereby obtain suitable two-phase precipitation particles and help { the 111} texture of deep-draw.
Summary of the invention
The object of the invention is to provide a kind of continuous annealing method of DC 01 steel plate with low yield and high tensile strength for automobiles, and it is higher to have solved carbon aluminium-killed steel (DC01) yield strength, and tensile strength is on the low side, forming property, the relatively poor problem of ageing resistance performance.
The present invention adopts a kind of production technique of new continuous annealing, and concrete chemical composition quality per-cent is: C, 0.02-0.04%; Mn, 0.2-0.35%; Si ,≤0.03%; P ,≤0.010%; S ,≤0.010%; Als, 0.02-0.06%, N, 0.0020～0.0050, surplus is Fe.
Hot-rolled process parameter: Heating temperature, 1250 ± 30 ℃; Finishing temperature, 930 ± 20 ℃; Coiling temperature, 730 ± 20 ℃.
Cold rolling draft:, be controlled at 75-85% according to different size.
Each process section temperature is as shown in the table in the continuous annealing furnace:
| Heating zone (℃) | Soaking zone (℃) | The slow cooling section outlet (℃) | Fast cold section outlet (℃) | The overaging section (℃) |
| 780±20 | 780±20 | 675±20 | 400±20 | 350±20 |
Soaking time: 50～100s.
Slow cooling section speed of cooling: 3～15 ℃/s; Fast cold section speed of cooling: 30～100 ℃/s.
Smooth unit elongation: 0.9 ± 0.3%.
On average about 190MPa, on average about 335MPa, yield tensile ratio is 0.567 to tensile strength to the yield strength of the product of producing.
Be adjusted at 750 ℃ ± 20 o'clock in the hot rolling reeling temperature, its yield strength mean value is about 180MPa.
The height of coiling temperature plays significant effect to the reduction of continuous annealing DC01 steel plate yield strength.High temperature batches the original grain that helps obtaining large-size, promotes separating out of AlN to grow up simultaneously; Help { the formation of 111} texture in the recrystallization annealing process after cold roller and deformed.
Certain cold rolling draft is the motivating force of zinc-plated subsequently operation annealing recrystallization, and recrystallize forming core point what have determined.This invention roughly is controlled at level greater than 75% according to different belt steel thickness specifications with cold rolling draft.
The relative reduction of chemical element C content has reduced Fe in the matrix
3C and pearlitic content help obtaining lower yield strength, the product yield strength are reduced have significant effect.
Higher annealing temperature is to reduce the another inducement of yield strength, and the present invention adopts 780 ℃ of annealing temperatures, makes steel plate that abundant recrystallize take place, and better regulates the size of grain-size by the control soaking time, thereby better controls the yield strength level.
But, when yield strength reduces, return the reduction that causes tensile strength equally.In order to obtain higher tensile strength and suitable yield tensile ratio, the present invention regulates by fast cold section temperature out of control continuous annealing and slow cooling section temperature out.Higher annealing temperature makes the Fe in the steel matrix
3C decomposes, and rationally controls the slow cooling temperature out, can control the dissolved carbon content level in the matrix, adopt lower happy temperature out, free carbon that is solidly soluted in the matrix fully is solidly soluted in the steel matrix, thereby plays the effect of solution strengthening, improve tensile strength.
Yield point elongation when eliminating the product stretching experiment prevents that the steel plate finished product from the L defective occurring and improving the ageing resistance performance of product in stamping process, and the present invention adopts 0.9 ± 0.3% smooth unit elongation to control.
The present invention is by being optimized to branch design, adjusts and optimizes hot rolling, cold rolling and parameter and annealing, flattening technological parameter, successfully produces the low-carbon (LC) al-killed automotive sheet (DC01) than low yield strength ratio.By adjusting C content on the basis that technologies such as hot rolling, cold rolling and continuous annealing are optimized, the continuous annealing steel plate of being produced have low yield strength ratio, high formability can characteristics.Improve quality product, can bring considerable economic.
Description of drawings
Fig. 1 is the distribution statistics situation of the yield strength of 20 volumes of the present invention: yield strength is distributed between the 175-210MPa, mean value 190MPa, standard deviation 7.8MPa.
The distribution statistics situation of the tensile strength of Fig. 2 20 volumes of the present invention, tensile strength is distributed in 310～370MPa, mean value 335MPa, standard deviation 15.8MPa.
Fig. 3 is a steel plate metallographic structure photo of the present invention, can know the carbide precipitated phase of seeing that crystal grain is inner tiny.
Embodiment
Be the mechanical property of the continuous annealing product that produces according to described method (comprising chemical ingredients and technology) in the present invention below.As can be seen, by adjusting the hot rolling reeling temperature, adopt suitable parameter and annealing, but the production mechanical property satisfies the requirement of auto sheet drawing performance.
| Sequence number | Soaking time, s | Heating temperature, ℃ | Soaking temperature, ℃ | The slow cooling outlet, ℃ | Fast cold outlet, ℃ | Overaging, ℃ | Re， MPa | Rm， MPa | A 80， ％ | Draft, % | Coiling temperature, ℃ | Carbon content, % |
| 1 | 65 | 750 | 750 | 646 | 404 | 376 | 192 | 340 | 41.5 | 75 | 727 | 0.05 |
| 2 | 65 | 750 | 750 | 650 | 400 | 360 | 188 | 335 | 39.5 | 75 | 720 | 0.04 |
| 3 | 65 | 750 | 750 | 650 | 400 | 360 | 188 | 340 | 42.5 | 75 | 720 | 0.04 |
| 4 | 65 | 750 ～ 760 | 750 ～ 760 | 651 | 400 ～ 421 | 370 | 195 | 335 | 44.0 | 75 | 728 | 0.03 |
| 5 | 65 | 760 | 760 | 650 | 420 | 390 ～ 370 | 195 | 335 | 44.0 | 75 | 729 | 0.03 |
| 6 | 58 | 780 | 780 | 670 | 420 | 390 | 186 | 335 | 40.0 | 75 | 730 | 0.04 |
| 7 | 58 | 780 | 780 | 670 | 420 | 390 | 185 | 335 | 42.0 | 75 | 730 | 0.04 |
| 8 | 58 | 780 | 780 | 670 | 420 | 390 | 189 | 335 | 41.0 | 75 | 730 | 0.04 |
Steel plate specification: 0.8 * 1250mm.
Claims (2)
1, a kind of continuous annealing method of DC 01 steel plate with low yield and high tensile strength for automobiles is characterized in that,
Hot-rolled process parameter: Heating temperature, 1220～1280 ℃; Finishing temperature, 950～990 ℃; Coiling temperature, 710～710 ℃; Cold rolling draft:, be controlled at 75-85% according to different size;
Each technological control temperature is in the continuous annealing furnace:
Heating zone: 760～800 ℃, soaking zone: 760～800 ℃, the slow cooling section temperature out: 655～695 ℃, slow cooling section speed of cooling: 3～15 ℃/second; Fast cold section temperature out: 380～420 ℃, fast cold section speed of cooling: 30～100 ℃/second; Overaging section: 330～370 ℃;
Soaking time: 50～100 seconds.
2, method according to claim 1 is characterized in that, the chemical ingredients mass percent of described steel plate is: C, 0.02-0.04%; Mn, 0.2-0.35%; Si ,≤0.03%; P ,≤0.010%; S ,≤0.010%; Als, 0.02-0.06%, N, 0.0020～0.0050, surplus is Fe.
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