CN103757530A - Thin strip continuous casting economic ultrahigh-strength binding strip with tensile strength of at least 1250 MPa and manufacturing method thereof - Google Patents
Thin strip continuous casting economic ultrahigh-strength binding strip with tensile strength of at least 1250 MPa and manufacturing method thereof Download PDFInfo
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- CN103757530A CN103757530A CN201410035057.5A CN201410035057A CN103757530A CN 103757530 A CN103757530 A CN 103757530A CN 201410035057 A CN201410035057 A CN 201410035057A CN 103757530 A CN103757530 A CN 103757530A
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Abstract
The invention relates to a thin strip continuous casting economic ultrahigh-strength binding strip with a tensile strength of at least 1250 MPa and a manufacturing method thereof. The manufacturing method comprises the following steps: 1) casting a casting strip with a thickness of 1.0-2.4 mm through a double-roll thin strip continuous casting process, wherein the casting strip comprises the following chemical components in percentage by weight: 0.28-0.38% of C, 0.25-0.35% of Si, 1.5-1.8% of Mn, no more than 0.015% of P, no more than 0.01% of S, no more than 0.012% of N and the balance of Fe and inevitable impurities; 2) cooling the casting strip; 3) performing on-line hot rolling on the casting strip; 4) performing lead bath isothermal quenching; and 5) coiling. According to the ultrahigh-strength binding strip produced through the thin strip continuous casting economic process, the tensile strength is at least 1250 MPa, and the elongation percentage is at least 6.5%.
Description
Technical field
The present invention relates to ultrahigh-strength steel tie and manufacture method thereof, relate in particular to thin strap continuous casting economy ultrahigh-strength steel tie and the manufacture method thereof of a kind of tensile strength >=1250MPa.
Background technology
Steel tie is a kind of thin ribbon shaped deep processed product of steel, is mainly used to tie up steel, non-ferrous metal, light textile goods, building materials, paper roll (plate) and wool and other items.In order to guarantee safe handling of cargo and transportation, require tie to there is higher tensile strength and certain unit elongation.In addition,, because tie is used for a long time in outdoor environment, also require to have certain corrosion resistance.
Steel tie is divided according to intensity, can be divided into low strong, in strong, high-strength and strong four classes of superelevation.The strong tie of superelevation wherein, is mainly used in paper industry, tobacco industry, and the tying up of compressed cotton, wool etc.Especially compress wool and tie up, be in great demand.
In order to facilitate transportation and the cost saving of wool volume, generally first wool is compressed, then bundle with tie, roll into the wool piece of one cubic metre of left and right, reinstall freight container.Due in transportation, the outside bulging force of compression wool is very large, thereby requires very high to the intensity of tie and plasticity.Although high-strength tie has good unit elongation, often intensity can not meet the demands.
At present, the production of ultrahigh-strength steel tie, is mainly to adopt lead patenting technique, by bainite, strengthens, and reaches the strong tie performance requriements of superelevation.This technique generally includes following steps: 1) utilize reheat+hot continuous rolling process of traditional continuous casting+slab to produce hot-rolled strip; 2) by cold rolling, hot-rolled strip is thinned to the needed thickness of the strong tie of superelevation; 3) steel band after cold rolling is heated to austenitizing; 4) lead patenting.
Denomination of invention is the US Patent No. 6814817 of " Steel Strap Composition ", by composition, be C0.30-0.36%, Mn0.90-1.25%, the cold-rolled steel strip of Si0.75-1.10%, first be preheating to 370-510 ℃, then be heated to 815-900 ℃ and carry out Ovshinsky, then carry out 370-510 ℃ of lead patenting and process.The steel tie tensile strength >=1170MPa that utilizes this explained hereafter, can reach 1240MPa, unit elongation >=6.5%.
Denomination of invention is the Chinese patent 200810200449.7 of " a kind of heat treating method of steel belt for packages ", and employing composition is C0.29-0.35%, Si0.15-0.35%, Mn1.20-1.55%, P0.030%, S0.030%, the hot-rolled sheet that surplus is Fe, after cold rolling, first in lead bath, be preheating to 355-365 ℃, warm up time, 6.75-9s, was then heated to 860 ± 20 ℃, and insulation 30-40s carries out austenitizing, carry out 355-365 ℃ of lead patenting again and process, isothermal quenching time is 21-28s.Utilize the steel tie tensile strength >=1350MPa of this explained hereafter, unit elongation >=6%.
Utilize the strong tie of prior art production superelevation, because processing route is long, complex process, causes its production efficiency lower, and production cost is higher.Can reduce tie production cost by Optimization Technology path, for example, the production of hot-rolled strip can adopt some emerging short flow process technology, as CSP, and thin strap continuous casting etc.Wherein, strip continuous casting technology is a cutting edge technology in metallurgy and investigation of materials field, its Iron And Steel Industry that appears as is brought a revolution, it has changed traditional production process of controlling hot rolled strip in metal working industry, by continuous casting, rolling, even thermal treatment etc. integrates, make the online hot rolling of strip base process a time of producing with regard to the thin steel band of disposable formation, greatly simplified production process, shortened the production cycle.Facility investment is corresponding minimizing also, and product cost significantly reduces.
The patent of relevant thin strap continuous casting product and manufacturing process thereof, mainly concentrate on soft steel and low-carbon microalloy product made from steel and manufacturing process thereof, the aspects such as product surface quality improvement, for example exercise question is the Chinese patent 201080008606.X of " hot rolled thin cast steel strip product and manufacture method thereof ", exercise question is the Chinese patent 201080017436.1 of " high strength thin cast strip product and preparation method thereof ", the Chinese patent 200880109715.3 that exercise question is " thin strip slab that tiny crack is reduced ", etc.The steel band of manufacturing by above-mentioned thin strap continuous casting patent, is not all to produce and design for high-strength tie, has not yet to see the precedent of utilizing thin band continuous casting technique to produce high-strength tie.
Summary of the invention
The object of the present invention is to provide the strong tie of thin strap continuous casting economy superelevation and the manufacture method thereof of a kind of tensile strength >=1250MPa, by reasonable component design and processes, design, solve the problem that processing route is long, production efficiency is lower, production cost is higher that prior art exists.
For achieving the above object, technical scheme of the present invention is:
It is main simple chemical composition design that the present invention adopts C, Si, Mn, does not add valuable alloying element and microalloy element.By thin strap continuous casting+online hot rolling technology, direct production goes out the hot steel band that thickness specification meets the strong tie requirement of superelevation, saves the processing step that hot-rolled strip is carried out to attenuate by cold rolling.By the hot-rolled strip that thin strap continuous casting+online hot rolling technology obtains, it is not carried out coolingly, directly carry out lead patenting, save cold rolling strap and reheat austenitizing treatment step.
Above-mentioned technical conceive, is equivalent to utilize first three step of the strong tie of prior art production superelevation, is reduced to a step and completes.
Particularly, the strong tie of thin strap continuous casting economy superelevation of tensile strength >=1250MPa of the present invention, its chemical component weight per-cent is: C0.28～0.38%, Si0.25～0.35%, Mn1.5～1.8%, P≤0.015%, S≤0.01%, N≤0.012%, all the other are Fe and inevitable impurity; Steel band microstructure mainly consists of bainite, and its cementite particle diameter is nanometer scale, and contains a small amount of martensite; Its tensile strength >=1250MPa, unit elongation >=6.5%.
In chemical composition design of the present invention:
C:C is strengthening element most economical, the most basic in steel, improves the intensity of steel by solution strengthening and precipitation strength.C can be dissolved in and in ferrite, form interstitial solid solution, but at room temperature its solubleness in ferrite is very limited, so its solution strengthening effect is restricted.Under processing condition of the present invention, C mainly separates out with cementite form, as the integral part of bainite.The content of cementite and C content are closely related, and when C content increases, cementite content increases, and intensity, the hardness of steel improve thereupon, and plasticity, the corresponding reduction of toughness.Therefore C content can not be too high, and the C content range that the present invention adopts is 0.28-0.38%.
Si:Si plays solution strengthening effect in steel.When Si content is suitable, not only make the intensity of steel be improved, and little on plasticity impact.The Si content range that the present invention adopts is 0.25-0.35%.
Mn:Mn is one of alloying element that price is the most cheap, it has sizable solid solubility in steel, improves the intensity of steel by solution strengthening, and its content is when suitable, substantially harmless to the plasticity of steel, be the topmost strengthening element of intensity that improves steel in C content situation reducing.The Mn content range that the present invention adopts is 1.5-1.8%.
P:P solubleness in α-Fe is very large.Compare with other elements, P caused solid solution strengthening effect in α-Fe is larger.But when P content is higher, along with the intensity raising of steel, its plasticity obviously reduces.Particularly in steel, P occurs in segregation situation, will cause larger cold shortness.In the present invention, P controls as impurity element, its content≤0.015%.
The solubleness of S:S in Fe is minimum, and the S in steel mostly chemical combination is FeS, and its harm is can cause the red brittleness of steel when carrying out hot-work, reduces ductility and the toughness of steel, causes crackle when rolling.In the present invention, S controls as impurity element, its content≤0.01%.
N: similar with C element, N element can improve the intensity of steel by gap solid solution, and still, the gap solid solution of N has larger harm to the plasticity of steel and toughness, so N content can not be too high.N content≤0.012% that the present invention adopts.
The strong tie manufacture method of thin strap continuous casting economy superelevation of tensile strength >=1250MPa of the present invention, comprises the steps:
1) adopt the Cast Strip that twin-roll thin strip continuous casting cast thickness is 1.0-2.4mm, its chemical component weight per-cent is: C0.28-0.38%, Si0.25-0.35%, Mn1.5-1.8%, P≤0.015%, S≤0.01%, N≤0.012%, all the other are Fe and inevitable impurity;
2) Cast Strip is carried out cooling, rate of cooling is 20-80 ℃/s;
3) online hot rolling is carried out in Cast Strip, finishing temperature >=900 ℃, hot rolling draft is 20-50%, after Band by Hot-rolling, there is the online recrystallize of austenite in the thickness≤1.2mm of steel band after hot rolling;
4) hot-rolled strip is carried out to lead patenting, lead bath temperature is 450-500 ℃, and the cool time is 15-25s;
5) steel band is carried out water-cooled and batched.Steel band microstructure mainly consists of bainite, and its cementite particle diameter is nanometer scale.
Further, described step 2) in, Cast Strip rate of cooling is 30-60 ℃/s.
In described step 3), finishing temperature >=950 ℃.
In described step 3), hot rolling draft is 30-50%.
In described manufacture method, can also increase as required step 6) to steel band turn blue, japanning, waxing or the subsequent disposal such as zinc-plated.
The strong tie of superelevation obtaining by above technical scheme, its tensile strength >=1250MPa, unit elongation >=6.5%.
In manufacturing process of the present invention:
1) thin strap continuous casting
Within molten steel is introduced in the crystallization roll of a pair of relative rotation and internal water cooling and the molten bath of side seal board formation, after rapid solidification, direct pouring goes out the Cast Strip that thickness is 1.0-2.4mm.This thickness piece scale value is by the strong tie finished product thickness of superelevation, and the online hot rolling draft inverse of subsequent design draws.
2) Cast Strip is cooling
Cast Strip from crystallization roll continuous casting out, through confined chamber, in confined chamber, carry out cooling.In order to keep inside, Cast Strip and surface quality, prevent that austenite crystal from high temperature growing up too fastly simultaneously, the rate of cooling of controlling Cast Strip is 20-80 ℃/s.Preferably, the rate of cooling of Cast Strip is 30-60 ℃/s.The cooling employing air cooling in Cast Strip mode, the pressure of cooling gas, the gentle nozzle location of flow can regulation and control.Cooling gas can be the rare gas elementes such as argon gas, nitrogen, helium, or the mixed gas of several gases.By controlling type, pressure, the flow of cooling gas, and nozzle is to the distance between Cast Strip etc., realizes the control to Cast Strip rate of cooling.
3) the online hot rolling in Cast Strip
By online hot rolling, hot-rolled strip is thinned to the required thickness specification of the strong tie of superelevation, and makes, after austenite hot rolling, online recrystallize occurs, refine austenite crystal grain, improves the homogeneity of organizing.
Recrystallization nucleation rate and growth rate are all the growth (Yong Qilong work, micro-alloyed steel-physics and mechanics are metallurgical) of exponential type relation with the rising of deformation temperature, temperature is higher, and recrystallize more easily occurs.
Deformation is the basis of generation recrystallize, is the motivating force of recrystallize---deformation stores the source of energy, after must surpassing certain motivating force, just recrystallize can occur, therefore only have over just recrystallize occurring after certain deformation quantity.Deformation quantity is larger, and deformation stores can be larger, and deformation storage can be larger, and Recrystallization nucleation and growth rate are all larger, even if also can start rapid enough and complete recrystallize at a lower temperature.And, deformation quantity increases, also can reduce the grain-size after austenite recrystallization, this is because Recrystallization nucleation rate is growth (the Yong Qilong work of exponential type relation with the rising of deformation storage energy, micro-alloyed steel-physics and mechanics are metallurgical), therefore being conducive to obtain the phase-change product of more tiny γ → α, is all favourable to improving the strong plasticity of steel band.
The present invention controls finishing temperature >=900 ℃, and hot rolling draft is 20-50%.By hot rolling, thickness of strips is thinned to 1.2mm and following, there is online recrystallize in austenite, so that steel band is obtaining tiny uniform bainite structure after follow-up lead patenting after hot rolling.
Preferably, finishing temperature >=950 ℃, hot rolling draft is 30-50%.
4) lead patenting, water-cooled and batch
Hot-rolled strip is carried out to lead patenting.Austempering temperature and time can be to lath of bainite and cementite particle size, and bainite transformation amount impacts, and then affects the performance of the strong tie of superelevation.In bainite transformation temperature range, austempering temperature is lower, and the lath of bainite obtaining is thinner, and cementite particle size is less; Isothermal quenching time is longer, and bainite transformation amount is larger.The lead bath temperature that the present invention controls austempering is 450-500 ℃, and the cool time is 15-25s.
By water-cooled, complete the subsequent transition of small portion residual austenite, this is very necessary for improving steel band intensity.
Steel band microstructure mainly consists of bainite, and its cementite particle diameter is nanometer scale, and contains a small amount of martensite.Steel band tensile strength >=1250MPa, unit elongation >=6.5%.
6) japanning, waxing or the subsequent disposal such as zinc-plated
Can be according to the application target of the strong tie of superelevation and environment for use etc., to steel band turn blue, japanning, waxing or the subsequent disposal such as zinc-plated.
The difference of the present invention and prior art and beneficial effect:
1) technique of the strong tie of prior art production superelevation is: reheat+hot continuous rolling of traditional continuous casting+slab+cold rolling+cold rolling strap heating austenitizing+lead patenting; The present invention adopts thin strap continuous casting+online strong tie of hot rolling+lead patenting explained hereafter superelevation, " slab reheats ", " hot continuous rolling ", " hot-rolled strip being carried out to attenuate by cold rolling " and " cold rolling strap is reheated to austenitizing to be processed " four processing steps, greatly simplification of flowsheets have been saved.
2), by the strong tie of superelevation of thin strap continuous casting of the present invention+online hot rolling economy explained hereafter, its performance is suitable with the strong tie of superelevation that utilizes prior art to produce.
3) technology of the strong tie of production superelevation of the present invention, flow process is short, energy consumption is few, discharge is few.Solved the problem that production efficiency is lower, production cost is higher that prior art exists.
Embodiment
Below in conjunction with embodiment, the present invention will be further described.
The molten steel of the embodiment of the present invention all adopts electrosmelting to obtain, and specific chemical composition is as shown in table 1.The Cast Strip thickness obtaining after thin strap continuous casting, Cast Strip rate of cooling, hot rolling finishing temperature, hot rolling draft, hot-rolled strip thickness, lead patenting temperature and time, and the tensile property of hot-rolled strip and high-strength tie is in Table 2.As can be seen from Table 2, the tensile strength >=1250MPa of the strong tie of superelevation of the present invention, unit elongation >=6.5%.
The molten steel chemical composition (wt.%) of table 1 embodiment
| Embodiment | C | Si | Mn | P | S | N |
| 1 | 0.29 | 0.28 | 1.51 | 0.015 | 0.009 | 0.0057 |
| 2 | 0.34 | 0.34 | 1.64 | 0.013 | 0.002 | 0.0062 |
| 3 | 0.38 | 0.25 | 1.78 | 0.011 | 0.005 | 0.0120 |
| 4 | 0.37 | 0.32 | 1.80 | 0.012 | 0.003 | 0.0096 |
| 5 | 0.28 | 0.35 | 1.69 | 0.009 | 0.004 | 0.0048 |
The strong tie tensile property of the processing parameter of table 2 embodiment 1-5 and superelevation
In sum, the present invention adopts thin strap continuous casting+online strong tie of hot rolling+lead patenting explained hereafter superelevation, " slab reheats ", " hot continuous rolling ", " hot-rolled strip being carried out to attenuate by cold rolling " and " cold rolling strap is reheated to austenitizing to be processed " four processing steps have been saved, simplification of flowsheet greatly, energy consumption is few, discharge is few.Solved the problem that production efficiency is lower, production cost is higher that prior art exists.
Claims (6)
1. the strong tie of thin strap continuous casting economy superelevation of tensile strength >=1250MPa, its chemical component weight per-cent is: C0.28～0.38%, Si0.25～0.35%, Mn1.5～1.8%, P≤0.015%, S≤0.01%, N≤0.012%, all the other are Fe and inevitable impurity; Steel band microstructure mainly consists of bainite, and its cementite particle diameter is nanometer scale; Its tensile strength >=1250MPa, unit elongation >=6.5%.
2. the strong tie manufacture method of thin strap continuous casting economy superelevation of tensile strength >=1250MPa, comprises the steps:
1) adopt the Cast Strip that twin-roll thin strip continuous casting cast thickness is 1.0～2.4mm, its chemical component weight per-cent is: C0.28～0.38%, Si0.25～0.35%, Mn1.5～1.8%, P≤0.015%, S≤0.01%, N≤0.012%, all the other are Fe and inevitable impurity;
2) Cast Strip is carried out cooling, rate of cooling is 20-80 ℃/s;
3) online hot rolling is carried out in Cast Strip, finishing temperature >=900 ℃, hot rolling draft is 20～50%, after Band by Hot-rolling, there is the online recrystallize of austenite in the thickness≤1.2mm of steel band after hot rolling;
4) hot rolled strip is carried out to lead patenting, lead bath temperature is 450～500 ℃, and the cool time is 15～25s;
5) steel band is carried out water-cooled and batched, steel band microstructure mainly consists of bainite, and its cementite particle diameter is nanometer scale; Its tensile strength >=1250MPa, unit elongation >=6.5%.
3. the strong tie manufacture method of thin strap continuous casting economy superelevation of tensile strength >=1250MPa as claimed in claim 2, is characterized in that: described step 2), Cast Strip rate of cooling is 30-60 ℃/s.
4. the strong tie manufacture method of thin strap continuous casting economy superelevation of tensile strength >=1250MPa as claimed in claim 2, is characterized in that: in described step 3), and finishing temperature >=950 ℃.
5. the strong tie manufacture method of thin strap continuous casting economy superelevation of tensile strength >=1250MPa as claimed in claim 2, is characterized in that: in described step 3), hot rolling draft is 30～50%.
6. the strong tie manufacture method of thin strap continuous casting economy superelevation of tensile strength >=1250MPa as claimed in claim 2, is characterized in that: also comprise step 6) to steel band turn blue, japanning, waxing or the subsequent disposal such as zinc-plated.
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| CN104178621A (en) * | 2014-09-05 | 2014-12-03 | 上海宝钢包装钢带有限公司 | Heat treatment method of steel band for packaging |
| CN106282878A (en) * | 2016-08-31 | 2017-01-04 | 大连理工大学 | A kind of preparation method of galvanizing warm working high intensity medium managese steel part |
| CN108950379A (en) * | 2018-06-08 | 2018-12-07 | 铃木加普腾钢丝（苏州）有限公司 | A kind of piano wire and preparation method of low stress high life |
| CN111663080A (en) * | 2020-06-23 | 2020-09-15 | 中南大学 | Manufacturing method of fine-grain low-carbon high-strength steel thin strip |
| CN112522633A (en) * | 2019-09-19 | 2021-03-19 | 宝山钢铁股份有限公司 | Thin-gauge martensitic steel strip and manufacturing method thereof |
| CN113751679A (en) * | 2021-09-09 | 2021-12-07 | 中南大学 | Manufacturing method of cobalt-free maraging steel cold-rolled thin strip |
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| CN104178621A (en) * | 2014-09-05 | 2014-12-03 | 上海宝钢包装钢带有限公司 | Heat treatment method of steel band for packaging |
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| CN108950379A (en) * | 2018-06-08 | 2018-12-07 | 铃木加普腾钢丝（苏州）有限公司 | A kind of piano wire and preparation method of low stress high life |
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| CN111663080A (en) * | 2020-06-23 | 2020-09-15 | 中南大学 | Manufacturing method of fine-grain low-carbon high-strength steel thin strip |
| CN111663080B (en) * | 2020-06-23 | 2021-11-12 | 中南大学 | Manufacturing method of fine-grain low-carbon high-strength steel thin strip |
| CN113751679A (en) * | 2021-09-09 | 2021-12-07 | 中南大学 | Manufacturing method of cobalt-free maraging steel cold-rolled thin strip |
| CN113751679B (en) * | 2021-09-09 | 2022-10-28 | 中南大学 | Manufacturing method of cobalt-free maraging steel cold-rolled thin strip |
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