CN102747295A - Bainite sheet steel produced by controlled rolling and cooling method and preparation method thereof - Google Patents
Bainite sheet steel produced by controlled rolling and cooling method and preparation method thereof Download PDFInfo
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- CN102747295A CN102747295A CN2012102644841A CN201210264484A CN102747295A CN 102747295 A CN102747295 A CN 102747295A CN 2012102644841 A CN2012102644841 A CN 2012102644841A CN 201210264484 A CN201210264484 A CN 201210264484A CN 102747295 A CN102747295 A CN 102747295A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 55
- 239000010959 steel Substances 0.000 title claims abstract description 55
- 238000005096 rolling process Methods 0.000 title claims abstract description 49
- 238000001816 cooling Methods 0.000 title claims abstract description 40
- 229910001563 bainite Inorganic materials 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims description 11
- 238000005516 engineering process Methods 0.000 claims abstract description 20
- 239000000126 substance Substances 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 15
- 238000005496 tempering Methods 0.000 claims description 9
- 238000003801 milling Methods 0.000 claims description 8
- 239000002918 waste heat Substances 0.000 claims description 8
- 230000009467 reduction Effects 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims description 4
- 238000007669 thermal treatment Methods 0.000 claims description 4
- 238000009825 accumulation Methods 0.000 claims description 3
- 239000004615 ingredient Substances 0.000 claims description 3
- 229910052758 niobium Inorganic materials 0.000 claims description 3
- 241001417490 Sillaginidae Species 0.000 claims description 2
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 11
- 239000011572 manganese Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 230000009466 transformation Effects 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000004411 aluminium Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
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- 238000013461 design Methods 0.000 description 2
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- 238000012360 testing method Methods 0.000 description 2
- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 101150090128 PCM1 gene Proteins 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
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- 239000002253 acid Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
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- 229910001567 cementite Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
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- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention belongs to the field of single rolled steel plate rolling processes in metallurgy industry, in particular relates to a bainite sheet steel produced by controlled rolling and cooling technology, and is characterized by comprising the following chemical components by weight: 0.02-0.08% of C, 0.25-0.55% of Si, 1.65-1.85% of Mn, not more than 0.015% of P, not more than 0.008% of S, 0.05-0.08% of Nb+Ti, 0.30-0.50% of Mo+Cr, 0.015-0.05% of Als and the balance of Fe and trace impurity elements, wherein C+Si/30+(Mn+Cr)/20+Mo/15 is not more than 0.25. According to the bainite sheet steel, the thickness specification range is 10-20 mm, the width of a finished product is not less than 0.85 time of nominal width of a rolling mill, unevenness of the steel plate is not more than 6 mm/m, the intensity index ReL is not less than 550 MPa, Rm is not less than 670 MPa, A is not less than 20%, and -20 DEG C Akv is not less than 200 J.
Description
Technical field
The invention belongs to metallurgy industry list rolled steel plate rolling technology field, particularly a kind of bainite tole that utilizes controlled rolling and controlled cooling method production and preparation method thereof.
Background technology
According to the difference of tissue topography, the kind of steel generally is divided into the heterogeneous type that pearlite type, bainite type, martensite type and heterogeneous structure thereof constitute.Wherein, bainitic steel is the steel class of tool development and application prospect, and it has kept H.T., good welding property, cold formability, erosion resistance and other application performance when intensity improves.In the production; Other steel of ys 460 ~ 620MPa level mainly adopts the bainite type tissue; Be mainly used in economic construction every field such as starting material exploitation, energy development, communications and transportation, construction of water conservancy works, town and country construction; Become of paramount importance structured material, (thickness≤20mm) the steel plate market demand is very big for wherein thin specification.
At present; In the high-strength steel of uni-tension rolling is produced; Realized implementing for traditional hardening and tempering process through controlled rolling and controlled cooling (TMCP) technology generations, thereby reduced production costs, reduce energy consumption, enhance productivity, its deficiency is to reaching the bainite structure controlled target; Generally to each processing parameter in the production process; Like Heating temperature, each stage rolling temperature, draft and roll postcooling parameter etc. strict requirement is all arranged, the technology controlling and process difficulty is especially for thin specification wide plate width of cloth steel plate; In existing given process parameters range, be difficult to according to production practical situation adjusting process to satisfy the steel-plate shape requirement, it is the factor that influences the maximum of this type of steel plate production that the roughness of therefore thin specification (10-20mm) wide plate width of cloth steel plate (finished width be >=0.85 times of milling train nominal width) steel plate exceeds standard.
Summary of the invention
Technical problem to be solved by this invention is to overcome the deficiency of prior art and product quality level, from the angle of the market requirement, a kind of bainite tole that utilizes controlled rolling and controlled cooling method production and preparation method thereof is provided.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of bainite tole that utilizes the controlled rolling and controlled cooling technology to produce; It is characterized in that: its chemical ingredients content by weight percentage is: C:0.02 ~ 0.08%, Si:0.25 ~ 0.55%, Mn:1.65 ~ 1.85%, P: S≤0.015% :≤0.008%, Nb+Ti:0.05 ~ 0.08%, Mo+Cr:0.30 ~ 0.50%, Als:0.015 ~ 0.05%; All the other are Fe and micro impurity element, and C+Si/30+ (Mn+Cr)/20+Mo/15≤0.25.
Press such scheme, described bainite tole thickness specification limit is 10 ~ 20mm, finished width>=0.85 times milling train nominal width, roughness≤6mm/m.
A kind of bainite steel-sheet preparation method who utilizes the controlled rolling and controlled cooling technology to produce, it is characterized in that: it may further comprise the steps:
(1) smelts by predetermined composition, obtain continuously cast bloom;
(2) rolling:
Continuously cast bloom in 1180 ℃～1240 ℃ equal thermal treatments, is carried out the controlled rolling of two stages then on milling train, the start rolling temperature of said fs >=1070 ℃ are guaranteeing to adopt heavy reduction rolling as far as possible under the milled sheet shape prerequisite; 950 ℃～980 ℃ of subordinate phase start rolling temperatures, finishing temperature >=850 ℃, rolling pass is controlled at 6 ~ 8 passages, every time draft is not less than 15%, and last passage to adopt draught be that 1 ~ 2mm gently presses;
(3) quicken cooling:
Adopt Mulpic to quicken cooling, said final cooling temperature is controlled at 400 ℃～450 ℃, 10～20 ℃/s of rate of cooling, and last lower collector pipe water is than being 1:1.2 ~ 1.8;
(4) waste heat self-tempering and straightening process:
Before quickening that the back is accomplished in cooling and steel plate being aligned, with aforementioned processing and steel plate on roller-way, swing 80 ~ 120s, to carry out the waste heat self-tempering, carry out the light reduction multi-pass according to the steel-plate shape situation then to align, till leveling.
Press such scheme, accumulation draft >=35% of fs in the said rolling technology, the intermediate blank thickness after rolling be finished product thickness 3-4 doubly.
C, Mn are the most effective solution strengthening elements; The content that increases Mn in the steel will reduce the transformation temperature of steel, and crystal grain thinning is when the content of Mn surpasses 1.5%; Also has the effect that promotes the steel bainiteization; And the bainite productivity in the steel improves with the increase of Mn, takes all factors into consideration the welding property factor, thus the present invention adopt low-carbon high-manganese be the basis chemical composition design.
Cr is medium carbide forming element, dissolves in austenitic Cr during heating and improves hardening capacity strongly.Cr part displacement iron in the steel forms alloyed cementite, improves its stability; A part is dissolved in the bainite ferrite, produces solution strengthening, improves the intensity and the hardness of matrix.Cr can not only make C curve obviously move to right, and bainite is separated with the bainite transformation zone, can significantly postpone perlitic transformation, makes steel in big cooling rate scope, obtain bainite structure.
Mo is present in the sosoloid and carbide of steel, and the solution strengthening effect is arranged, and can improve the bainite hardening capacity of steel.Mo has significant retardation function to perlitic transformation, and less to the influence of bainite transformation, thereby in sizable cooling rate scope, can obtain whole bainite structures.Cr and Mo add in the steel simultaneously, stop polygonal ferrite to be separated out strongly, and full bainite structure effect is more obvious for obtaining.Thereby guaranteed that Plate Steel obtains uniform bainite structure in broad cooling rate scope.
In steel, add Nb, can through Nb (CN) not solute point and strain inducing separate out the recrystallize that suppresses the high temperature deformation process, enlarge non-recrystallization district scope so that the execution of TMCP technology, thereby reach the purpose of refinement ferrite crystal grain; The interpolation of Ti can be played the effect of growing up that suppresses austenite crystal in the heat-processed, and simultaneously, micro-alloy low-temperature district precipitate also can play the effect of precipitation strength.
The adding of Al then can form molten aluminium (Als) of acid and sour insoluble aluminium in the steel, and Als comprises solid solution aluminium and AlN, and the AlN particle of disperse can stop growing up of austenite crystal, crystal grain thinning.
S, P are the detrimental impurity elements in the steel, and P in the steel, S content are low more good more.S content is easy to generate problems such as hot-short more for a long time during hot rolling in steel; And in the steel P content more for a long time, it is cold short that steel takes place easily, in addition, segregation also takes place in phosphorus easily.
Preparation technology of the present invention heats through the controlling packet rubbing board base of rolling technology in advance, to the optimized distribution of rolling pass and draught etc., can be before quickening cooling the increase relaxation time; Help separating out and structure refinement of carboritride; And under certain external force effect, reduce, help the raising of steel plate over-all properties, on the other hand because the dislocation desity that high-temperature reply causes reduces; At draft or the draught of rolling technology subordinate phase through each passage of control; The capacity of equipment of milling train capable of using is carried out high-temperature straightening to steel plate, reaches certain smooth effect, improves rolled sheet material plate shape; Can guarantee that through adjustment Mulpic accelerated cooling process parameter steel plate evenly cools off; Thereby avoid steel plate problems such as plate shapes such as wooden dipper song are bad to occur in process of cooling; Controlled chilling process steel-plate shape does not worsen; Utilize the structural stress that warm phase transformation produced during the waste heat self-tempering made after quickening to cool off fully to discharge then; Adopt light reduction multi-pass straightening process can avoid increasing the steel plate unrelieved stress again, can guarantee that plate shape problems such as wooden dipper song can not appear because of stress relief in steel plate in the cold bed process of cooling, and final through control steel high temperature austenite tissue morphology, phase transition process; Types of organization, the form of control steel, distribute and separate out equal factor, make the bainite tole that meets the demands.
The bainite steel-sheet method of manufacture that the present invention relates to adopts control to prick cooling control technology, through regulating and control the processing parameter in each process step, has solved thin specification wide plate width of cloth steel-plate shape problem; Do not need thermal treatment, and need not to add other any equipment, can prepare the bainite tole of excellent performance; The bainite tole thickness specification limit of preparation is 10 ~ 20mm thus, finished width>=0.85 times milling train nominal width, steel plate roughness≤6mm/m; Intensity index: ReL (ys)>=550MPa; Rm (tensile strength)>=670MPa, A (unit elongation)>=20% ,-20 ℃ of Akv (ballistic work)>=200J; Compare with domestic and international equal ys rank steel grade, (20 ℃ of Akv>=200J), be applicable to be manufactured on the steel equipment of working in the extreme cold environment have enlarged product applications to have better low-temperature impact toughness;
Production technique is easy to be controlled, and production efficiency is high.
Description of drawings
Fig. 1 is the bainite steel-sheet rolling pattern figure in the embodiment of the invention 1;
Fig. 2 is the bainite structure figure of the rich steel plate of bainite in the embodiment of the invention 1.
Embodiment
Below in conjunction with instance summary of the invention of the present invention is described further:
Embodiment 1
The bainite tole that utilizes the controlled rolling and controlled cooling technology to produce; Thickness is 10mm; Width 3800mm, its chemical ingredients content is by weight percentage seen table 1, is specially: C:0.05%, Si:0.39%, Mn:1.68%, P:0.013%, S:0.004%, Nb+Ti:0.07%, Mo+Cr:0.35%, Als:0.035%; All the other are Fe and micro impurity element, and C+Si/30+ (Mn+Cr)/20+Mo/15 (abbreviating Pcm in the table 1 as)＜0.25;
Concrete preparation method is following:
(1) according to predetermined composition, sees table 1, produce on the line in the 130t converter and smelt, and be cast into the continuously cast bloom that specification is 250mm * 1600mm * L.
Table 1 instance steel chemical composition of the present invention (wt%)
| Instance | C | Si | Mn | P | S | Cr+Mo | Nb+ Ti | Als | Pcm |
| 1 | 0.05 | 0.39 | 1.68 | 0.013 | 0.004 | 0.35 | 0.07 | 0.035 | ＜0.25 |
| 2 | 0.02 | 0.50 | 1.70 | 0.012 | 0.005 | 0.40 | 0.08 | 0.030 | ＜0.25 |
| 3 | 0.08 | 0.35 | 1.65 | 0.012 | 0.004 | 0.32 | 0.05 | 0.015 | ＜0.25 |
| 4 | 0.06 | 0.40 | 1.72 | 0.014 | 0.003 | 0.36 | 0.06 | 0.019 | ＜0.25 |
(2) rolling:
After the continuously cast bloom acceptance(check); In 1180 ℃～1240 ℃ equal thermal treatments; On the 4300mm milling train, carry out the controlled rolling of two stages then, 1198 ℃ of the start rolling temperatures of said fs are guaranteeing to adopt heavy reduction rolling as far as possible under the milled sheet shape prerequisite; Make accumulation draft >=35% of fs, the intermediate blank thickness after rolling is 40mm; 968 ℃ of subordinate phase start rolling temperatures, finishing temperature are 860 ℃, and rolling pass is 7 passages, and every time draft is not less than 15%, and last passage employing draught is that 1 ~ 2mm gently presses; Concrete rolling procedure is seen Fig. 1, and the rolling technological parameter condition setting is seen table 2;
The control of table 2 controlled rolling process significant parameter
(3) quicken cooling:
Adopt Mulpic to quicken cooling, said final cooling temperature is controlled at 420 ℃, 18 ℃/s of rate of cooling, and last lower collector pipe water is than being 1:1.3, accelerated cooling process parameter condition setting is seen table 3.
The control of table 3 cooling control technology significant parameter
| Instance | Last lower collector pipe water ratio | Speed of cooling/℃/s | Final cooling temperature/℃ |
| 1 | 1:1.2 | 18 | 420 |
| 2 | 1:1.8 | 16 | 440 |
| 3 | 1:1.4 | 10 | 400 |
| 4 | 1:1.6 | 20 | 450 |
(4) waste heat self-tempering and straightening process:
Before quickening cooling and accomplishing back and steel plate aligning, with aforementioned processing and steel plate on roller-way, swing 100s, to carry out the waste heat self-tempering, carry out the light reduction multi-pass according to the steel-plate shape situation then to align, till leveling.Steel plate is cooled to the room temperature non-planeness measurement and the service check result sees table 4, and bainite structure figure sees Fig. 2.Can be found out by Fig. 2: steel plate is organized as granular bainite and lath-shaped mixed structure, and homogeneous microstructure is tiny.
Steel plate irregularity degree among each embodiment of table 4 and mechanical properties test result
| Instance | Roughness/mm/m | ReL/MPa | Rm/Mpa | A/% | -20 ℃ of Akv/J | Clod wash d=3a |
| 1 | 5 | 575 | 705 | 21.0 | 230 | Qualified |
| 2 | 4 | 565 | 690 | 21.5 | 215 | Qualified |
| 3 | 4 | 580 | 710 | 20.5 | 220 | Qualified |
| 4 | 5 | 570 | 715 | 21.0 | 235 | Qualified |
Embodiment 2-4
Method with reference to embodiment 1; According to component concentration design and each the bainite tole of the corresponding preparation of processing condition in the table 1-table 3; Wherein: the rolling time of waste heat self-tempering light plate on roller-way is respectively 80s, 90s, 120s among the embodiment 2-4; The bainite tole chemical composition content for preparing is thus seen table 1, and steel plate irregularity degree and mechanical properties test result see table 4.
Claims (4)
1. one kind is utilized the technological bainite tole of producing of controlled rolling and controlled cooling; It is characterized in that: its chemical ingredients content by weight percentage is: C:0.02 ~ 0.08%, Si:0.25 ~ 0.55%, Mn:1.65 ~ 1.85%, P: S≤0.015% :≤0.008%, Nb+Ti:0.05 ~ 0.08%, Mo+Cr:0.30 ~ 0.50%, Als:0.015 ~ 0.05%; All the other are Fe and micro impurity element, and C+Si/30+ (Mn+Cr)/20+Mo/15≤0.25.
2. the bainite tole that utilizes the controlled rolling and controlled cooling technology to produce according to claim 1, it is characterized in that: described bainite tole thickness specification limit is 10 ~ 20mm, finished width>=0.85 times milling train nominal width, roughness≤6mm/m.
3. the bainite steel-sheet preparation method who utilizes the controlled rolling and controlled cooling technology to produce according to claim 1, it is characterized in that: it may further comprise the steps:
(1) smelts by predetermined composition, obtain continuously cast bloom;
(2) rolling:
Continuously cast bloom in 1180 ℃～1240 ℃ equal thermal treatments, is carried out the controlled rolling of two stages then on milling train, the start rolling temperature of said fs >=1070 ℃ are guaranteeing to adopt heavy reduction rolling as far as possible under the milled sheet shape prerequisite; 950 ℃～980 ℃ of subordinate phase start rolling temperatures, finishing temperature >=850 ℃, rolling pass is controlled at 6 ~ 8 passages, every time draft is not less than 15%, and last passage to adopt draught be that 1 ~ 2mm gently presses;
(3) quicken cooling:
Adopt Mulpic to quicken cooling, said final cooling temperature is controlled at 400 ℃～450 ℃, 10～20 ℃/s of rate of cooling, and last lower collector pipe water is than being 1:1.2 ~ 1.8;
(4) waste heat self-tempering and straightening process:
Before quickening that the back is accomplished in cooling and steel plate being aligned, with aforementioned processing and steel plate on roller-way, swing 80 ~ 120s, to carry out the waste heat self-tempering, carry out the light reduction multi-pass according to the steel-plate shape situation then to align, till leveling.
4. the bainite steel-sheet preparation method who utilizes controlled rolling and controlled cooling technology to produce according to claim 3 is characterized in that: accumulation draft >=35% of fs in the said rolling technology, the intermediate blank thickness after rolling be finished product thickness 3-4 doubly.
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| CN111690801A (en) * | 2020-05-25 | 2020-09-22 | 中天钢铁集团有限公司 | Production process of alloy tool steel wire rod for obtaining full bainite structure |
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| CN103484768A (en) * | 2013-09-30 | 2014-01-01 | 武汉钢铁(集团)公司 | High-strength engineering steel plate with length of larger than or equal to 30 m and production method |
| CN103484768B (en) * | 2013-09-30 | 2016-03-09 | 武汉钢铁(集团)公司 | The high-strength engineering steel plate of a kind of length >=30m and production method |
| CN110983184A (en) * | 2019-12-17 | 2020-04-10 | 邯郸钢铁集团有限责任公司 | Low-carbon TMCP state ship plate steel and production method thereof |
| CN111690801A (en) * | 2020-05-25 | 2020-09-22 | 中天钢铁集团有限公司 | Production process of alloy tool steel wire rod for obtaining full bainite structure |
| CN111690801B (en) * | 2020-05-25 | 2021-11-02 | 中天钢铁集团有限公司 | Production process of alloy tool steel wire rod for obtaining full bainite structure |
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