CN104862583A - Pickle sheet for 400MPa-level automobile structure and production method of pickle sheet - Google Patents
Pickle sheet for 400MPa-level automobile structure and production method of pickle sheet Download PDFInfo
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- CN104862583A CN104862583A CN201510197147.9A CN201510197147A CN104862583A CN 104862583 A CN104862583 A CN 104862583A CN 201510197147 A CN201510197147 A CN 201510197147A CN 104862583 A CN104862583 A CN 104862583A
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Abstract
The invention discloses a hot-rolling pickle sheet for a 400MPa-level automobile structure and a production method of the pickle sheet. Main elements of the hot-rolling pickle sheet comprise 0.06 percent to 0.08 percent of C, Si smaller than or equal to 0.05 percent, 1.0 percent to 1.15 percent of Mn, 0.02 percent to 0.05 percent of Al, P smaller than or equal to 0.015 percent, S smaller than or equal to 0.008 percent, and the balanced Fe and trace elements. When the hot-rolling pickle sheet with the thickness of 2 mm to 6 mm is rolled, the heating temperature ranges from 1160 DEG C to 1220 DEG C, the final rolling temperature ranges from 820 DEG C to 860 DEG C, a front-segment-area rapid cooling mode is adopted in a cooling mode, and the reeling temperature ranges from 560 DEG C to 600 DEG C. Low-carbon low-silicon component design is adopted, and through control over the technology in the rolling process and the acid pickling process, the hot-rolling pickle sheet for the automobile structure can be produced and is good in surface quality and stamping performance.
Description
Technical field
The invention belongs to technical field of steel rolling, be specifically related to a kind of 400MPa level vehicle structure hot rolling acid-cleaning plate and production method thereof.
Background technology
The auto output of China in 2014 has broken through 2,300 ten thousand, and within continuous 6 years, keep the status of the large automobile production state of the first in the world, the demand of vehicle structure steel plate is increasing.At present, the steel plate be applied on automobile structure is mainly carbon structural steel or structural low alloy steel.Carbon structural steel and structural low alloy steel, for reducing production cost, adopt C as the main solution strengthening element of steel grade, C content 0.15 ~ 0.2% usually.
As patent CN102912229A, the chemical composition of slab: C0.15% ~ 0.20%, Si 0.05% ~ 0.20%, Mn0.1% ~ 0.5%, B0.0005% ~ 0.004%, N≤0.0060%, Al0.02% ~ 0.05%, Ti0.015% ~ 0.025%, Ca0.0025% ~ 0.0060%, 0.12≤Ca/Al≤0.2, remaining is Fe.Heating of plate blank 1100 ~ 1180 DEG C, be incubated 2 ~ 3 hours, roughing open rolling 1020 ~ 1100 DEG C, workpiece thickness/finished product thickness >5, finish rolling open rolling 950 ~ 1000 DEG C, cumulative deformation is greater than 50%, finishing temperature 850 ~ 900 DEG C, 6 ~ 20 DEG C/s is chilled to 500 ~ 600 DEG C and batches after rolling, and air cooling afterwards, can obtain 390MPa level hot rolled steel plate.This patent improves intensity mainly through C solution strengthening, and unit elongation≤30%, punching performance is poor, there is stamping cracking problem in cold forming process.
There is metalluster sense on vehicle structure hot rolling acid-cleaning plate surface, and has good punching performance and electrocoating paint coating performance.Meanwhile, acid-cleaning plate is having the closed production line production in acid regeneration workshop, and whole process is discharged without spent acid, and solve Automobile Enterprises " mud acid is washed " spent acid pollution problem afterwards, social benefit is remarkable.Along with constantly perfect to legislative work for protecting environment of the whole world, modern automobile industry is towards energy-saving and environmental protection and the development of security aspect, and vehicle structure hot rolling acid-cleaning plate will progressively replace common hot-rolled structural steel to produce automobile structure.
For ensureing punching performance, vehicle structure acid-cleaning plate usually will lean in chemical composition and add the alloying elements such as Nb, V, Ti, Cr to ensure that its obdurability mates.If Chinese patent CN 102719754 A and CN102732795 A etc. is mainly by adding microalloy element Cr crystal grain thinning, improve obdurability.The vehicle structure acid-cleaning plate excellent performance that this method is produced, but cost is higher.
Summary of the invention
The object of the present invention is to provide a kind of 400MPa level vehicle structure hot rolling acid-cleaning plate and production method thereof, adopt low carbon low silicon Composition Design, by the technology controlling and process to the operation of rolling and acid cleaning process, produce the vehicle structure hot rolling acid-cleaning plate that surface quality is good, punching performance is excellent.
To achieve these goals, the present invention adopts following technical scheme:
A kind of 400MPa level vehicle structure hot rolling acid-cleaning plate, by weight percentage, described hot rolling acid-cleaning plate contains C 0.06 ~ 0.08%, Si≤0.05%, Mn 1.00 ~ 1.15%, Al 0.02 ~ 0.05%, P≤0.015%, S≤0.008%, and the Fe of surplus and inevitable impurity.
Preferably, the yield strength >=270MPa of 400MPa level vehicle structure hot rolling acid-cleaning plate, tensile strength is 400 ~ 460MPa, unit elongation >=40%.
A production method for 400MPa level vehicle structure hot rolling acid-cleaning plate, comprises the steps:
(1) prepare steel billet, wherein, by weight percentage, described steel billet contains C 0.06 ~ 0.08%, Si≤0.05%, Mn 1.00 ~ 1.15%, Al 0.02 ~ 0.05%, P≤0.015%, S≤0.008%, and the Fe of surplus and inevitable impurity;
(2) hot rolling, by behind heating steel billet to 1160 ~ 1220 DEG C, roughing becomes intermediate blank, and roughing draft is 80 ~ 85%; Be the coil of strip of thickness 2 ~ 6mm by intermediate blank finish rolling after insulation again, wherein, finishing temperature is 820 ~ 860 DEG C, and coiling temperature is 560 ~ 600 DEG C, and cooling mode adopts the quick cooling mode in leading portion district;
(3) smooth, flat line on hot rolling is carried out skin pass rolling, and smooth unit elongation is 1.0 ~ 2.0%;
(4) pickling, adopt chlorohydric acid pickling, acid liquor temperature is 70 ~ 85 DEG C, and in acid solution, the concentration of hydrochloric acid is no more than 160g/L, Fe
2+mass concentration control at below 130g/L, add in acid solution during pickling inhibiter formed Acidwash solution, the weight percent that inhibiter accounts for Acidwash solution is 0.05 ~ 0.10%;
(5) carry out oiling-bundling-packaging after pickling, obtain finished product.
Preferably, in the production method of described 400MPa level vehicle structure hot rolling acid-cleaning plate, behind heating steel billet to 1160 ~ 1220 DEG C, roughing becomes intermediate blank, and roughing draft is 80 ~ 85%; Be the coil of strip of thickness 2 ~ 6mm by intermediate blank finish rolling after insulation again, wherein, finishing temperature is 820 ~ 860 DEG C, and coiling temperature is 560 ~ 600 DEG C, and cooling mode adopts the quick cooling mode in leading portion district.
Preferably, in the production method of described 400MPa level vehicle structure hot rolling acid-cleaning plate, adopt chlorohydric acid pickling, acid liquor temperature is 70 ~ 85 DEG C, and in acid solution, the concentration of hydrochloric acid is no more than 160g/L, Fe
2+mass concentration control at below 130g/L, add in acid solution during pickling inhibiter formed Acidwash solution, the weight percent that inhibiter accounts for Acidwash solution is 0.05 ~ 0.10%.
Beneficial effect of the present invention:
(1) vehicle structure acid-cleaning plate of the present invention adopts low-carbon (LC) Composition Design, improves acid-cleaning plate punching performance; Adopt low silicon Composition Design, avoid pickling substrate surface to form difficult pickling Fe
2siO
4oxide skin; By the technology controlling and process to the operation of rolling and acid cleaning process, the vehicle structure hot rolling acid-cleaning plate that surface quality is good, punching performance is excellent can be produced.
(2) do not add the alloying elements such as Nb, V, Ti, Cr in acid-cleaning plate of the present invention, production cost is lower.
(3) acid-cleaning plate of the present invention is having the closed production line production in acid regeneration workshop, and whole process is discharged without spent acid, and solve Automobile Enterprises " mud acid is washed " spent acid pollution problem afterwards, social benefit is remarkable.
Accompanying drawing explanation
Fig. 1 is the structure figure of acid-cleaning plate in embodiment 1;
Fig. 2 is the structure figure of acid-cleaning plate in embodiment 1.
Embodiment
Below by specific embodiment, vehicle structure hot rolling acid-cleaning plate of the present invention and production method are described.Wherein, the measuring method of the yield strength in example of the present invention, tensile strength, unit elongation all measures by national standard.
Embodiment one
By weight percentage, the chemical composition of steel billet is: C:0.07%, Si:0.03%, Mn:1.10%, P:0.011%, S:0.003%, Als:0.036%, and all the other are Fe and inevitable impurity.
Its production process is: steel billet → hot rolling → section cooling → batch → smooth → pickling → oiling → finished product.The thick steel billet of 220mm is after 1200 DEG C of heating, through the intermediate blank that the roughing of two reversing rougher 6 passages becomes 35mm thick, roughing draft is 84.1%, finishing train is entered again after Coil Box insulation, through the coil of strip that 7 passes become 2.8mm thick, finish rolling draft is 92.0%, and finishing temperature is 850 DEG C.Coil of strip enters reeling machine and batches to obtain band steel after section cooling, and coiling temperature is 580 DEG C.After steel roll temperature is lower than 50 degree, coil of strip is transported to skin pass mill group smooth, smooth unit elongation is 1.2%.Finally smooth rear coil of strip is transported to push pull pickling line pickling, pickling adopts chlorohydric acid pickling, and acid liquor temperature is 70 ~ 85 DEG C, and in acid solution, the concentration of hydrochloric acid is no more than 160g/L, and the mass concentration of Fe2+ controls at below 130g/L.In acid solution, add inhibiter during pickling form Acidwash solution, the weight percent that inhibiter accounts for Acidwash solution is 0.05 ~ 0.10%.Carry out oiling (bundling)-packaging after pickling, obtain the vehicle structure hot rolling acid-cleaning plate that 2.8mm is thick.
After measured, the performance of the vehicle structure hot rolling deep-draw acid-cleaning plate that the present embodiment is produced is as follows: yield strength, tensile strength, unit elongation are respectively 324MPa, 432MPa, 43%, and the metallographic structure of acid-cleaning plate is ferrite+pearlitic structure, as shown in Figure 1.
Embodiment two
By weight percentage, the chemical composition of steel billet is: C:0.08%, Si:0.03%, Mn:1.08%, P:0.012%, S:0.005%, Als:0.042%, and all the other are Fe and inevitable impurity.
Its production process is: steel billet → hot rolling → section cooling → batch → smooth → pickling → oiling → finished product.The thick steel billet of 220mm is after 1200 DEG C of heating, through the intermediate blank that the roughing of two reversing rougher 6 passages becomes 40mm thick, roughing draft is 81.8%, finishing train is entered again after Coil Box insulation, through the coil of strip that 7 passes become 3.5mm thick, finish rolling draft is 91.3%, and finishing temperature is 850 DEG C.Coil of strip enters reeling machine and batches to obtain band steel after section cooling, and coiling temperature is 590 DEG C.After steel roll temperature is lower than 50 degree, coil of strip is transported to skin pass mill group smooth, smooth unit elongation is 1.2%.Finally smooth rear coil of strip is transported to push pull pickling line pickling, pickling adopts chlorohydric acid pickling, and acid liquor temperature is 70 ~ 85 DEG C, and in acid solution, the concentration of hydrochloric acid is no more than 160g/L, and the mass concentration of Fe2+ controls at below 130g/L.In acid solution, add inhibiter during pickling form Acidwash solution, the weight percent that inhibiter accounts for Acidwash solution is 0.05 ~ 0.10%.Carry out oiling (bundling)-packaging after pickling, obtain the vehicle structure hot rolling acid-cleaning plate that 3.5mm is thick.
After measured, the performance of the vehicle structure hot rolling deep-draw acid-cleaning plate that the present embodiment is produced is as follows: yield strength, tensile strength, unit elongation are respectively 338MPa, 439MPa, 44%, and the metallographic structure of acid-cleaning plate is ferrite+pearlitic structure, as shown in Figure 2.
The above embodiment only have expressed the specific embodiment of the present invention, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.Those skilled in the art all drops in protection scope of the present invention any variation that the present invention does under the enlightenment that the present invention conceives.
Claims (5)
1. a 400MPa level vehicle structure hot rolling acid-cleaning plate, it is characterized in that, by weight percentage, described hot rolling acid-cleaning plate contains C 0.06 ~ 0.08%, Si≤0.05%, Mn 1.00 ~ 1.15%, Al 0.02 ~ 0.05%, P≤0.015%, S≤0.008%, and the Fe of surplus and inevitable impurity.
2. 400MPa level vehicle structure hot rolling acid-cleaning plate according to claim 1, it is characterized in that, the yield strength >=270MPa of described hot rolling acid-cleaning plate, tensile strength is 400 ~ 460MPa, unit elongation >=40%.
3. a production method for 400MPa level vehicle structure hot rolling acid-cleaning plate, is characterized in that, described production method comprises the steps:
(1) prepare steel billet, wherein, by weight percentage, described steel billet contains C 0.06 ~ 0.08%, Si≤0.05%, Mn 1.00 ~ 1.15%, Al 0.02 ~ 0.05%, P≤0.015%, S≤0.008%, and the Fe of surplus and inevitable impurity;
(2) hot rolling, by behind heating steel billet to 1160 ~ 1220 DEG C, roughing becomes intermediate blank, and roughing draft is 80 ~ 85%; Be the coil of strip of thickness 2 ~ 6mm by intermediate blank finish rolling after insulation again, wherein, finishing temperature is 820 ~ 860 DEG C, and coiling temperature is 560 ~ 600 DEG C, and cooling mode adopts the quick cooling mode in leading portion district;
(3) smooth, flat line on hot rolling is carried out skin pass rolling, and smooth unit elongation is 1.0 ~ 2.0%;
(4) pickling, adopt chlorohydric acid pickling, acid liquor temperature is 70 ~ 85 DEG C, and in acid solution, the concentration of hydrochloric acid is no more than 160g/L, Fe
2+mass concentration control at below 130g/L, add in acid solution during pickling inhibiter formed Acidwash solution, the weight percent that inhibiter accounts for Acidwash solution is 0.05 ~ 0.10%;
(5) carry out oiling-bundling-packaging after pickling, obtain finished product.
4. the production method of 400MPa level vehicle structure hot rolling acid-cleaning plate according to claim 3, is characterized in that, behind heating steel billet to 1160 ~ 1220 DEG C, roughing becomes intermediate blank, and roughing draft is 80 ~ 85%; Be the coil of strip of thickness 2 ~ 6mm by intermediate blank finish rolling after insulation again, wherein, finishing temperature is 820 ~ 860 DEG C, and coiling temperature is 560 ~ 600 DEG C, and cooling mode adopts the quick cooling mode in leading portion district.
5. the production method of 400MPa level vehicle structure hot rolling acid-cleaning plate according to claim 3, is characterized in that, adopt chlorohydric acid pickling, acid liquor temperature is 70 ~ 85 DEG C, and in acid solution, the concentration of hydrochloric acid is no more than 160g/L, Fe
2+mass concentration control at below 130g/L, add in acid solution during pickling inhibiter formed Acidwash solution, the weight percent that inhibiter accounts for Acidwash solution is 0.05 ~ 0.10%.
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| CN201510197147.9A CN104862583A (en) | 2015-04-23 | 2015-04-23 | Pickle sheet for 400MPa-level automobile structure and production method of pickle sheet |
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| CN201510197147.9A CN104862583A (en) | 2015-04-23 | 2015-04-23 | Pickle sheet for 400MPa-level automobile structure and production method of pickle sheet |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105925900A (en) * | 2016-07-15 | 2016-09-07 | 武汉钢铁股份有限公司 | Hot-rolled pickled steel with tensile strength of 400MPa grade and used for high-surface quality automobiles, and production method thereof |
| CN105925901A (en) * | 2016-07-15 | 2016-09-07 | 武汉钢铁股份有限公司 | Hot-rolled pickled steel with tensile strength of 370MPa grade and used for high-surface quality automobiles, and production method thereof |
| CN105925891A (en) * | 2016-07-15 | 2016-09-07 | 武汉钢铁股份有限公司 | Hot-rolled pickled steel with tensile strength of 310MPa grade and used for high-surface quality automobiles, and production method thereof |
| CN106011632A (en) * | 2016-07-15 | 2016-10-12 | 武汉钢铁股份有限公司 | High-surface-quality hot-rolled pickling steel with tensile strength being 440 MPa and for automobiles and production method |
| CN107587052A (en) * | 2017-08-03 | 2018-01-16 | 江苏省沙钢钢铁研究院有限公司 | A kind of automobile structure cold rolling high-strength steel and its manufacture method |
| CN109865742A (en) * | 2019-02-27 | 2019-06-11 | 江苏省沙钢钢铁研究院有限公司 | A kind of production method of 440MPa grades of thin gauge hot rolling acid-cleaning Automobile Plate |
| CN110055458A (en) * | 2019-03-28 | 2019-07-26 | 江苏省沙钢钢铁研究院有限公司 | A kind of production method of hot rolling acid-cleaning Automobile Plate |
| CN111151578A (en) * | 2020-01-19 | 2020-05-15 | 河钢股份有限公司承德分公司 | Method for eliminating transverse crease lines at head of low-carbon steel hot-rolled pickled plate |
| CN114774783A (en) * | 2022-03-29 | 2022-07-22 | 本钢板材股份有限公司 | Preparation method of low-cost high-weldability 440 MPa-grade hot-rolled pickled plate for automobile structure |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105925900A (en) * | 2016-07-15 | 2016-09-07 | 武汉钢铁股份有限公司 | Hot-rolled pickled steel with tensile strength of 400MPa grade and used for high-surface quality automobiles, and production method thereof |
| CN105925901A (en) * | 2016-07-15 | 2016-09-07 | 武汉钢铁股份有限公司 | Hot-rolled pickled steel with tensile strength of 370MPa grade and used for high-surface quality automobiles, and production method thereof |
| CN105925891A (en) * | 2016-07-15 | 2016-09-07 | 武汉钢铁股份有限公司 | Hot-rolled pickled steel with tensile strength of 310MPa grade and used for high-surface quality automobiles, and production method thereof |
| CN106011632A (en) * | 2016-07-15 | 2016-10-12 | 武汉钢铁股份有限公司 | High-surface-quality hot-rolled pickling steel with tensile strength being 440 MPa and for automobiles and production method |
| CN106011632B (en) * | 2016-07-15 | 2018-08-07 | 武汉钢铁有限公司 | Tensile strength is 440MPa grades of great surface quality automobile hot rolling acid-cleaning steel and production method |
| CN105925891B (en) * | 2016-07-15 | 2018-09-14 | 武汉钢铁有限公司 | Tensile strength is 310MPa grades of great surface quality automobile hot rolling acid-cleaning steel and production method |
| CN105925900B (en) * | 2016-07-15 | 2018-09-18 | 武汉钢铁有限公司 | Tensile strength is 400MPa grades of great surface quality automobile hot rolling acid-cleaning steel and production method |
| CN107587052A (en) * | 2017-08-03 | 2018-01-16 | 江苏省沙钢钢铁研究院有限公司 | A kind of automobile structure cold rolling high-strength steel and its manufacture method |
| CN109865742A (en) * | 2019-02-27 | 2019-06-11 | 江苏省沙钢钢铁研究院有限公司 | A kind of production method of 440MPa grades of thin gauge hot rolling acid-cleaning Automobile Plate |
| CN110055458A (en) * | 2019-03-28 | 2019-07-26 | 江苏省沙钢钢铁研究院有限公司 | A kind of production method of hot rolling acid-cleaning Automobile Plate |
| CN111151578A (en) * | 2020-01-19 | 2020-05-15 | 河钢股份有限公司承德分公司 | Method for eliminating transverse crease lines at head of low-carbon steel hot-rolled pickled plate |
| CN114774783A (en) * | 2022-03-29 | 2022-07-22 | 本钢板材股份有限公司 | Preparation method of low-cost high-weldability 440 MPa-grade hot-rolled pickled plate for automobile structure |
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