CN102071359A - Ultra-high-intensity automobile structural steel and production method thereof - Google Patents
Ultra-high-intensity automobile structural steel and production method thereof Download PDFInfo
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Abstract
The invention relates to ultra-high-intensity automobile structural steel and a production method thereof, which are applicable to middle thin slab production lines and belong to the technical field of high-intensity steel production in metallurgical industry. The invention has the technical scheme that the ultra-high-intensity automobile structural steel comprises the following chemical ingredients in percentage by mass: at most 0.11 percent of C, 1.6 to 2.0 percent of Mn, 0.3 to 0.5 percent of Si, 0.02 to 0.06 percent of Nb, 0.07 to 0.12 percent of Ti, 0.15 to 0.40 percent of Mo, 0.015 to 0.030 percent of Als and the balance Fe. The ultra-high-intensity automobile structural steel is used for manufacturing steel plates of automobile structural elements, the tensile strength is higher than or equal to 800Mpa, the yield strength is higher than or equal to 700, the elongation rate is higher than or equal to 14 percent, and the zero DEG C impact is higher than or equal to 60J. Through optimizing the ingredient design and improving process parameters of each work procedure in the production, the produced steel plate used for manufacturing automobile structural elements can meet various mechanical property indexes of the steel for the automobile, the steel grade can completely meet the performance requirement for manufacturing the ultra-high-intensity automobile structural element through a production method of controlling the coarse milling, the fine milling, the rolling temperature and the like in the thin slab milling process, the intensity of the automobile structural steel is improved, the dead weight of an automobile is greatly reduced, and the design is favorable for energy saving and emission reduction.
Description
Technical field
The present invention relates to a kind of superstrength vehicle structure steel and production method thereof, be applicable to the medium thin slab production line, belong to metallurgy industry high-strength steel production technical field.
Background technology
Along with the development of metallurgical technology, more and more higher to the control accuracy of various elements in the steel, and the removal of impurity element has been reached higher level.These technical progresses make the smelting of superstrength steel grade become possibility; The raising of steel rolling technology simultaneously is for the Rolling Production of superstrength steel grade provides assurance.At present, the steel plate that is applied on the automobile structure is mainly the Q345B rank, and Q345B is the solution strengthening by C-Mn, and its chemical ingredients is: C:0.16-0.20%, Mn: 1.00-1.55%, Si:0.20-0.50%, Als: 〉=0.015%, and all the other are iron.Its requirement of strength only is tensile strength: 〉=470Mpa, yield strength: 〉=345.Therefore production technique is simple, and main process is: the tapping temperature of (1) slab: 1100-1200 ℃; The finish rolling inlet temperature is 1020-1080 ℃.(2) finishing temperature is: 860-890 ℃; (3) coiling temperature is: 580-630 ℃; Steel grade mechanical property level according to this explained hereafter is: tensile strength: 520-610Mpa; Yield strength: 385-430Mpa.Because intensity is not high, can only improve anchorage force by increasing steel plate thickness, caused waste of material, increased automotive dead weight simultaneously.In recent years under the background of the global low-carbon economy and the economy of energy, the light-weighted industry requirement of automobile improves year by year, especially along with automobile pollution constantly increases, rising steadily of fuel price, automotive industry requires also more and more higher to lightweight, safety, environmental protection and fuel economy, energy-conservation and environmental protection then requires automobile production producer guaranteeing to reduce tare on the basis of vehicle safety as far as possible.The light-weighted main path of automobile is that the specification of automobile steel is carried out attenuate, alleviates automotive dead weight thereby reach, and how producing superstrength vehicle structure steel becomes the technical problem that this area needs to be resolved hurrily.
Summary of the invention
The object of the invention provides a kind of superstrength vehicle structure steel and production method thereof, improves the vehicle structure hardness of steel, and the deadweight of automobile is alleviated greatly, helps energy-saving and emission-reduction, solves the problems referred to above that exist in the background technology.
Technical scheme of the present invention is:
A kind of superstrength vehicle structure steel, its special feature are that the chemical ingredients massfraction is C≤0.11%; Mn 1.6-2.0%; Si 0.3-0.5%; Nb 0.02-0.06%; Ti 0.07-0.12%; Mo 0.15-0.40%; Als 0.015-0.030%; Surplus Fe.
Above-mentioned superstrength vehicle structure steel is used to make the steel plate of automobile structure, tensile strength: 〉=800Mpa, yield strength: 〉=700 unit elongation: 〉=14%, 0 ℃ of impact: 〉=60J.
A kind of production method of superstrength vehicle structure steel, it comprises the following technological process of production: blast furnace ironmaking, converter steelmaking, LF refining, intermediate gauge sheet billet continuous casting, walking beam furnace heating, roughing, Coil Box, finish rolling, laminar flow cooling control, batch, finished product; Control molten steel chemical ingredients massfraction in converter steelmaking, the LF refining procedure: C≤0.11%; Mn 1.6-2.0%; Si 0.3-0.5%; Nb 0.02-0.06%; Ti 0.07-0.12%; Mo 0.15-0.40%; Als 0.015-0.030%; Surplus Fe.
Converter steel making working procedure in the described technical process, the alloying of Mo element is carried out alloying by add Mo-Fe in converter; Mn carries out alloying with low carbon ferromanganese after by deoxidation in tapping process; Ti carries out alloying after the LF refining.
Described medium heavy slab continuous casting working procedure, pulling rate is 1.2-2.0m/min, and the slab thickness that goes out crystallizer is 150mm, and the continuous casting whole process adopts the protection of inert gas cast.
Described Coil Box operation is that the head and the afterbody that will roll plate after roughing replaced, and makes intermediate blank carry out soaking.
Described roughing operation, start rolling temperature are 1150-1200 ℃, intermediate blank size 35-40mm.
Described finish rolling operation, temperature in 980-1050 ℃; Finishing temperature 830-870 ℃.
Described coiling process is 500-580 ℃ according to product performance and specification control coiling temperature.
Adopt above-mentioned processing method can be met the superstrength steel of producing automobile structure.
Beneficial effect of the present invention: the present invention is by being optimized to the processing parameter of each operation in branch design, the improvement production, production is used to make the steel plate of automobile structure, can satisfy every mechanical performance index of automobile steel, and by the production methods such as roughing, finish rolling and coiling temperature in the control medium thin slab operation of rolling, make steel grade satisfy the performance requriements of making the superstrength automobile structure fully, improve the vehicle structure hardness of steel, the deadweight of automobile is alleviated greatly, help energy-saving and emission-reduction.
Description of drawings
Fig. 1 is the metallographic structure figure of the embodiment of the invention.
Embodiment
The invention will be further described by the following examples.
A kind of superstrength vehicle structure steel, its special feature are that the chemical ingredients massfraction is C :≤0.11%; Mn:1.6-2.0%; Si:0.3-0.5%; Nb:0.02-0.06%; Ti:0.07-0.12%; Mo:0.15-0.40%; Als:0.015-0.030%; Surplus Fe.Above-mentioned superstrength vehicle structure steel is used to make the steel plate of automobile structure, tensile strength: 〉=800Mpa, yield strength: 〉=700 unit elongation: 〉=14%, 0 ℃ of impact: 〉=60J.
A kind of production method of superstrength vehicle structure steel, it comprises the following technological process of production: blast furnace ironmaking, converter steelmaking, LF refining, intermediate gauge sheet billet continuous casting, walking beam furnace heating, roughing, Coil Box, finish rolling, laminar flow cooling control, batch, finished product; Control molten steel chemical ingredients massfraction: C :≤0.11% in converter steelmaking, the LF refining procedure; Mn:1.6-2.0%; Si:0.3-0.5%; Nb:0.02-0.06%; Ti:0.07-0.12%; Mo:0.15-0.40%; Als:0.015-0.030%; Surplus Fe.Converter steel making working procedure in the described technical process, the alloying of Mo element is carried out alloying by add Mo-Fe in converter; Mn carries out alloying with low carbon ferromanganese after by deoxidation in tapping process; Ti carries out alloying after the LF refining.Described medium heavy slab continuous casting working procedure, pulling rate is 1.2-2.0m/min, and the slab thickness that goes out crystallizer is 150mm, and the continuous casting whole process adopts the protection of inert gas cast.Described Coil Box operation is that the head and the afterbody that will roll plate after roughing replaced, and makes intermediate blank carry out soaking.Described roughing operation, start rolling temperature are 1150-1200 ℃, intermediate blank size 35-40mm.Described finish rolling operation, temperature in 980-1050 ℃; Finishing temperature 830-870 ℃.Described coiling process is 500-580 ℃ according to product performance and specification control coiling temperature.
With reference to accompanying drawing 1, metallographic structure of the present invention is an acicular ferrite.
Specific embodiments of the invention are as follows:
Embodiment one:
Produce 8.0mm thickness steel, chemical ingredients is as follows: C%:0.10; Mn%:1.86; Si%:0.48; Nb%:0.057; Ti%:0. 11; Mo%:0.34; Als%:0.020; All the other are iron.The slab start rolling temperature is 1190 ℃, enters the roughing mill roughing; Intermediate blank 40mm is thick, enters the Coil Box samming; Intermediate blank through samming enters finishing mill finish rolling, and its finishing mill temperature in is 1000 ℃, and finishing temperature is 840 ℃; Coiling temperature is 520 ℃.
Embodiment two:
Produce 6.0mm thickness steel, chemical ingredients is as follows: C%:0.07; Mn%:1.80; Si%:0.42; Nb%:0.043; Ti%:0. 098; Mo%:0.29; Als%:0.028; All the other are iron.Slab heating temperature is 1160 ℃, enters the roughing mill roughing; Intermediate blank 35mm is thick, and the intermediate blank after the roughing enters the Coil Box samming; Intermediate blank through samming enters finishing mill finish rolling, and its finishing mill temperature in is 1020 ℃, and finishing temperature is 850 ℃; Coiling temperature is 550 ℃.
Embodiment three:
Rolling 3.0mm thickness steel, chemical ingredients is as follows: C%:0.0.05; Mn%:1.62; Si%:0.34; Nb%:0.023; Ti%:0. 073; Mo%:0.18; Als%:0.018; All the other are iron.Slab heating temperature is 1170 ℃, enters the roughing mill roughing; Intermediate blank 35mm is thick, and the intermediate blank after the roughing enters the Coil Box samming; Intermediate blank through samming enters finishing mill finish rolling, and its finishing mill temperature in is 1050 ℃, and finishing temperature is 870 ℃; Coiling temperature is 580 ℃.
Embodiment four:
Rolling 10.0mm thickness steel, the chemical ingredients proportioning is as follows: C:0.11%; Mn:1.6%; Si:0.3 ~ 0.5%; Nb:0.02%; Ti:0.07%; Mo:0.15%; Als:0.015%; Surplus Fe.Slab heating temperature (start rolling temperature) is 1150 ℃, enters the roughing mill roughing; Intermediate blank 35mm is thick, and the intermediate blank after the roughing enters the Coil Box samming; Intermediate blank through samming enters finishing mill finish rolling, and its finishing mill temperature in is 980 ℃, and finishing temperature is 830 ℃; Coiling temperature is 500 ℃.
Embodiment five:
Rolling 3.5mm thickness steel, the chemical ingredients proportioning is as follows: C:0.11%; Mn:2.0%; Si:0.5%; Nb:0.06%; Ti:0.12%; Mo:0.40%; Als:0.030%; Surplus Fe.Slab heating temperature (start rolling temperature) is 1200 ℃, enters the roughing mill roughing; Intermediate blank 40mm is thick, and the intermediate blank after the roughing enters the Coil Box samming; Intermediate blank through samming enters finishing mill finish rolling, and its finishing mill temperature in is 1050 ℃, and finishing temperature is 870 ℃; Coiling temperature is 580 ℃.
The various embodiments described above superstrength vehicle structure steel is used to make the steel plate of automobile structure, tensile strength: 〉=800Mpa, yield strength: 〉=700 unit elongation: 〉=14%, 0 ℃ of impact: 〉=60J.
Claims (9)
1. a superstrength vehicle structure steel is characterized in that chemical ingredients massfraction: C :≤0.11%; Mn:1.6 ~ 2.0%; Si:0.3 ~ 0.5%; Nb:0.02 ~ 0.06%; Ti:0.07 ~ 0.12%; Mo:0.15 ~ 0.40%; Als:0.015～0.030%; Surplus Fe.
2. the superstrength vehicle structure steel according to claim 1, it is characterized in that above-mentioned superstrength vehicle structure steel is used to make the steel plate of automobile structure, tensile strength: 〉=800Mpa, yield strength: 〉=700 unit elongation: 〉=14%, 0 ℃ of impact: 〉=60J.
3. the production method of a superstrength vehicle structure steel is characterized in that it comprises the following technological process of production: blast furnace ironmaking, converter steelmaking, LF refining, intermediate gauge sheet billet continuous casting, walking beam furnace heating, roughing, Coil Box, finish rolling, laminar flow cooling control, batch, finished product; Control molten steel chemical ingredients massfraction: C :≤0.11% in converter steelmaking, the LF refining procedure; Mn:1.6 ~ 2.0%; Si:0.3 ~ 0.5%; Nb:0.02 ~ 0.06%; Ti:0.07 ~ 0.12%; Mo:0.15 ~ 0.40%; Als:0.015～0.030%; Surplus Fe.
4. according to the production method of the described superstrength vehicle structure steel of claim 3, it is characterized in that converter steel making working procedure in the described technical process, the alloying of Mo element is carried out alloying by add Mo-Fe in converter; Mn carries out alloying with low carbon ferromanganese after by deoxidation in tapping process; Ti carries out alloying after the LF refining.
5. according to the production method of claim 3 or 4 described superstrength vehicle structure steel; it is characterized in that described medium heavy slab continuous casting working procedure; pulling rate is 1.2-2.0m/min, and the slab thickness that goes out crystallizer is 150mm, and the continuous casting whole process adopts the protection of inert gas cast.
6. according to the production method of claim 3 or 4 described superstrength vehicle structure steel, it is characterized in that described Coil Box operation, is that the head and the afterbody that will roll plate after roughing replaced, and makes intermediate blank carry out soaking.
7. according to the production method of claim 3 or 4 described superstrength vehicle structure steel, it is characterized in that described roughing operation, start rolling temperature is 1150-1200 ℃, intermediate blank size 35-40mm.
8. according to the production method of claim 3 or 4 described superstrength vehicle structure steel, it is characterized in that described finish rolling operation, temperature in 980-1050 ℃; Finishing temperature 830-870 ℃.
9. according to the production method of claim 3 or 4 described superstrength vehicle structure steel, it is characterized in that described coiling process, is 500-580 ℃ according to product performance and specification control coiling temperature.
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Cited By (4)
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| CN104846276A (en) * | 2015-05-11 | 2015-08-19 | 唐山钢铁集团有限责任公司 | Automobile structural steel and production method thereof |
| CN107475485A (en) * | 2017-08-07 | 2017-12-15 | 唐山钢铁集团有限责任公司 | The control method of the narrow composition of LF refining automobile steel alloy |
| CN108342656A (en) * | 2018-03-13 | 2018-07-31 | 朱威威 | A kind of superhigh intensity automobile structural steel and its production method |
| CN114101339A (en) * | 2021-10-29 | 2022-03-01 | 唐山钢铁集团有限责任公司 | Production method for thinning hot-rolled high-strength strip steel with over 980MPa |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104846276A (en) * | 2015-05-11 | 2015-08-19 | 唐山钢铁集团有限责任公司 | Automobile structural steel and production method thereof |
| CN107475485A (en) * | 2017-08-07 | 2017-12-15 | 唐山钢铁集团有限责任公司 | The control method of the narrow composition of LF refining automobile steel alloy |
| CN107475485B (en) * | 2017-08-07 | 2019-05-24 | 唐山钢铁集团有限责任公司 | The control method of the narrow ingredient of LF refining automobile steel alloy |
| CN108342656A (en) * | 2018-03-13 | 2018-07-31 | 朱威威 | A kind of superhigh intensity automobile structural steel and its production method |
| CN114101339A (en) * | 2021-10-29 | 2022-03-01 | 唐山钢铁集团有限责任公司 | Production method for thinning hot-rolled high-strength strip steel with over 980MPa |
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Address after: 063016 Hebei province Tangshan City Road North Binhe Road, No. 9 Patentee after: River steel Limited by Share Ltd Tangshan branch Address before: 063016 Hebei province Tangshan City Road North Binhe Road, No. 9 Patentee before: Hebei Steel Co., Ltd., Tangshan Branch |