CN103757530B - The thin strap continuous casting economy ultra-high strength package binding band of tensile strength >=1250MPa and manufacture method thereof - Google Patents

The thin strap continuous casting economy ultra-high strength package binding band of tensile strength >=1250MPa and manufacture method thereof Download PDF

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CN103757530B
CN103757530B CN201410035057.5A CN201410035057A CN103757530B CN 103757530 B CN103757530 B CN 103757530B CN 201410035057 A CN201410035057 A CN 201410035057A CN 103757530 B CN103757530 B CN 103757530B
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continuous casting
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ultra
1250mpa
tensile strength
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CN103757530A (en
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王秀芳
王成全
于艳
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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Abstract

The thin strap continuous casting economy ultra-high strength package binding band of tensile strength >=1250MPa and manufacture method thereof, it comprises the steps: 1) to use twin-roll thin strip continuous casting cast thickness be the Cast Strip of 1.0 2.4mm, its chemical component weight percentage ratio is: C0.28 0.38%, Si0.25 0.35%, Mn1.5 1.8%, P≤0.015%, S≤0.01%, N≤0.012%, remaining is Fe and inevitable impurity;2) Cast Strip cooling;3) the online hot rolling in Cast Strip;4) lead patenting;5) batch.The ultra-high strength package binding band that the present invention is produced by thin strap continuous casting economy technique, tensile strength >=1250MPa, elongation percentage >=6.5%.

Description

The thin strap continuous casting economy ultra-high strength package binding band of tensile strength >=1250MPa and manufacture thereof Method
Technical field
The present invention relates to unimach tie and manufacture method thereof, particularly relate to a kind of tensile strength >=1250MPa's Thin strap continuous casting economy unimach tie and manufacture method thereof.
Background technology
Steel tie is a kind of thin ribbon shaped deep processed product of steel, be mainly used to tie up steel, non-ferrous metal, light textile goods, Building materials, paper roll (plate) and Pilus Caprae seu Ovis and other items.In order to ensure safe handling of cargo and transport, it is desirable to it is strong that tie has higher tension Degree and certain elongation percentage.Additionally, due to tie uses for a long time in outdoor environment, it is also desirable to have certain corrosion resistance Energy.
Steel tie divides according to intensity, can be divided into low strong, in strong, high-strength and strong four classes of superelevation.Ultra-high strength package binding band therein, It is mainly used in tying up of paper industry, tobacco business, and compressed cotton, Pilus Caprae seu Ovis etc..Especially compression Pilus Caprae seu Ovis is tied up, and demand is very Greatly.
For convenience Pilus Caprae seu Ovis volume transport and save expense, the most first Pilus Caprae seu Ovis is compressed, then bundlees with tie, Roll into the Pilus Caprae seu Ovis block of about a cubic metre, reinstall container.Owing to, in transportation, the outward expansion power of compression Pilus Caprae seu Ovis is very Greatly, intensity and plasticity requirements thus to tie are the highest.Although high-strength tie has a preferable elongation percentage, but often intensity is not Requirement can be met.
At present, the production of unimach tie, mainly use lead patenting technique, strengthened by bainite, Reach ultra-high strength package binding band performance requirement.This technique generally includes following steps: 1) utilize tradition continuous casting+slab to reheat+heat Continuous rolling process produces hot-rolled strip;2) by cold rolling thickness hot-rolled strip being thinned to required for ultra-high strength package binding band;3) to after cold rolling Steel band carry out heat austenitizing;4) lead patenting.
United States Patent (USP) US6814817 of invention entitled " Steel Strap Composition ", is C0.30-by composition The cold-rolled strip of 0.36%, Mn0.90-1.25%, Si0.75-1.10%, is initially pre-heated to 370-510 DEG C, is then heated to 815- 900 DEG C carry out Ovshinsky, then carry out 370-510 DEG C of lead patenting process.The steel tie tension utilizing this technique to produce is strong Degree >=1170MPa, can reach 1240MPa, elongation percentage >=6.5%.
The Chinese patent 200810200449.7 of invention entitled " heat treatment method of a kind of steel belt for packages ", uses into Being divided into C0.29-0.35%, Si0.15-0.35%, Mn1.20-1.55%, P0.030%, S0.030%, surplus is the hot rolled plate of Fe, cold First being preheating to 355-365 DEG C in lead bath after rolling, preheating time, 6.75-9s, was then heated to 860 ± 20 DEG C, was incubated 30- 40s carries out austenitizing, then carries out 355-365 DEG C of lead patenting process, and isothermal quenching time is 21-28s.Utilize this work Steel tie tensile strength >=1350MPa that skill produces, elongation percentage >=6%.
Utilize prior art to produce ultra-high strength package binding band, owing to processing route is long, complex process, cause its production efficiency relatively Low, production cost is higher.Can reduce tie production cost by optimizing processing route, such as, the production of hot-rolled strip is permissible Use the short route technology that some are emerging, such as CSP, thin strap continuous casting etc..Wherein, strip continuous casting technology is metallurgical And a cutting edge technology in investigation of materials field, its steel and iron industry that appears as brings a revolution, and it changes tradition and controls The production process of hot rolled strip in metal working industry, by casting continuously, roll, even heat treatment etc. integrates, and makes the thin of production Made-up belt the most disposably forms thin steel strip through the online hot rolling of a time, enormously simplify production process, shortens the production cycle.If Standby investment reduces the most accordingly, and product cost significantly reduces.
About thin strap continuous casting product and the patent of manufacturing process thereof, it is concentrated mainly on mild steel and low-carbon microalloy product made from steel And manufacturing process, the aspect such as product surface quality improvement, the most entitled " hot rolled thin cast steel strip product and manufacturer thereof Method " Chinese patent 201080008606.X, the Chinese patent of entitled " high strength thin cast strip product and preparation method thereof " 201080017436.1, the Chinese patent 200880109715.3 of entitled " thin strip slab that micro-crack is reduced ", etc.. By above-mentioned thin strap continuous casting patent manufacture steel band, be not for high-strength tie produce and design, have not yet to see utilize thin The precedent of high-strength tie is produced with continuous casting process.
Summary of the invention
It is an object of the invention to provide a kind of tensile strength >=1250MPa thin strap continuous casting economy ultra-high strength package binding band and Its manufacture method, is designed by rational composition design and processes, solves processing route length, production effect that prior art exists The problem that rate is relatively low, production cost is higher.
For reaching above-mentioned purpose, the technical scheme is that
The present invention uses C, Si, Mn to be main simple Design of Chemical Composition, without valuable alloying element and microalloy Element.By thin strap continuous casting+online hot rolling technology, it is directly produced out thickness specification and meets the hot steel band that ultra-high strength package binding band requires, Save, by cold rolling, hot-rolled strip carried out thinning processing step.The hot rolling obtained by thin strap continuous casting+online hot rolling technology Band, does not cools down it, directly carries out lead patenting, saves cold rolling strap and reheats austenitizing process step.
Above-mentioned technology is conceived, and is equivalent to first three step that prior art will be utilized to produce ultra-high strength package binding band, is reduced to one Walk.
Specifically, the thin strap continuous casting economy ultra-high strength package binding band of the tensile strength >=1250MPa of the present invention, its chemical composition Percentage by weight is: C0.28~0.38%, Si0.25~0.35%, Mn1.5~1.8%, P≤0.015%, S≤0.01%, N≤ 0.012%, remaining is Fe and inevitable impurity;Steel band microscopic structure is mainly made up of bainite, its cementite particle diameter For nanometer scale, and containing a small amount of martensite;Its tensile strength >=1250MPa, elongation percentage >=6.5%.
In the Design of Chemical Composition of the present invention:
C:C is intensified element most economical, most basic in steel, improves the strong of steel by solution strengthening and precipitation strength Degree.C can be dissolved in ferrite formation interstitial solid solution, but at room temperature its dissolubility in ferrite is extremely limited, therefore Its solution strengthening effect is restricted.Under the conditions of present invention process, C mainly separates out with cementite form, as bainite Ingredient.The content of cementite is closely related with C content, and when C content increases, cementite content increases, the intensity of steel, hard Degree improves therewith, and plasticity, toughness reduce accordingly.Therefore C content can not be too high, and the C content scope that the present invention uses is 0.28- 0.38%。
Si:Si plays solution strengthening effect in steel.When Si content is suitable, the intensity of steel is not only made to be improved, and right Plasticity impact is little.The Si content range that the present invention uses is 0.25-0.35%.
Mn:Mn is one of generally the least expensive alloying element of price, and it has sizable solid solubility in steel, strong by solid solution Change the intensity improving steel, and when its content is suitable, the most harmless to the plasticity of steel, it is to improve in the case of reducing C content The topmost intensified element of intensity of steel.The Mn content range that the present invention uses is 1.5-1.8%.
P:P dissolubility in α-Fe is the biggest.Compared with other elements, solid solution strengthening effect caused in α-Fe for P is relatively Greatly.But when P content is higher, along with the intensity of steel improves, its plasticity substantially reduces.In the case of particularly in steel, there is segregation in P, Bigger cold brittleness will be caused.In the present invention, P is to control as impurity element, its content≤0.015%.
S:S dissolubility in Fe is minimum, and the mostly chemical combination of the S in steel is FeS, and its harm is to draw when carrying out hot-working Play the red brittleness of steel, reduce ductility and the toughness of steel, cause crackle when rolling.In the present invention, S is as impurity element Control, its content≤0.01%.
N: similar with C element, N element can improve the intensity of steel by gap solid solution, but, the gap solid solution of N is to steel Plasticity and toughness have bigger harm, and therefore N content can not be too high.N content≤0.012% that the present invention uses.
The thin strap continuous casting economy ultra-high strength package binding band manufacture method of the tensile strength >=1250MPa of the present invention, including as follows Step:
1) using twin-roll thin strip continuous casting cast thickness is the Cast Strip of 1.0-2.4mm, its chemical component weight percentage ratio For: C0.28-0.38%, Si0.25-0.35%, Mn1.5-1.8%, P≤0.015%, S≤0.01%, N≤0.012%, remaining is Fe With inevitable impurity;
2) cooling down Cast Strip, cooldown rate is 20-80 DEG C/s;
3) Cast Strip carrying out online hot rolling, finishing temperature >=900 DEG C, hot rolling reduction ratio is 20-50%, steel band after hot rolling , after Band by Hot-rolling, there is the online recrystallization of austenite in thickness≤1.2mm;
4) hot-rolled strip carrying out lead patenting, lead bath temperature is 450-500 DEG C, and the cool time is 15-25s;
5) steel band is carried out water-cooled and batches.Steel band microscopic structure is mainly made up of bainite, its cementite particle diameter For nanometer scale.
Further, described step 2) in, Cast Strip cooldown rate is 30-60 DEG C/s.
In described step 3), finishing temperature >=950 DEG C.
In described step 3), hot rolling reduction ratio is 30-50%.
In described manufacture method, it is also possible to increase step 6) as required and steel band is turned blue, paint, wax or zinc-plated Etc. subsequent treatment.
The ultra-high strength package binding band obtained by above technical scheme, its tensile strength >=1250MPa, elongation percentage >=6.5%.
In the manufacturing process of the present invention:
1) thin strap continuous casting
Molten steel is introduced in a pair and rotates against and within the molten bath of the crystallization roll of internal water cooling and side seal board formation, pass through After rapid solidification, direct pouring goes out the Cast Strip that thickness is 1.0-2.4mm.This thickness specification value passes through ultra-high strength package binding band finished product thickness, And the online hot rolling reduction ratio inverse of subsequent design draws.
2) Cast Strip cooling
Cast Strip from crystallization roll continuous casting out after, through confined chamber, cool down in confined chamber.In order to keep inside Cast Strip And surface quality, prevent austenite crystal from high temperature growing up too fast simultaneously, the cooldown rate controlling Cast Strip is 20-80 DEG C/s. Preferably, the cooldown rate of Cast Strip is 30-60 DEG C/s.Cast Strip cooling uses air cooling mode, and the cooling pressure of gas, flow are gentle Nozzle location can regulate and control.Cooling gas can be the noble gases such as argon, nitrogen, helium, or several gas Mixing gas.By controlling the cooling type of gas, pressure, flow, and nozzle is to the distance etc. between Cast Strip, it is achieved right The control of Cast Strip cooldown rate.
3) the online hot rolling in Cast Strip
By online hot rolling, hot-rolled strip is thinned to the thickness specification needed for ultra-high strength package binding band, and after making austenite hot rolling There is online recrystallization, fining austenite grains, improve the uniformity of tissue.
Recrystallization nucleation rate and growth rate are all with the rising of deformation temperature and the growth (Yong Qilong of exponentially type relation Writing, micro alloyed steel-physics and mechanics are metallurgical), temperature is the highest, is more susceptible to recrystallization.
Deformation is the basis that recrystallization occurs, and is the source of the driving force deformation storage energy of recrystallization, due to necessary Recrystallization just can occur after exceeding certain driving force, therefore recrystallization just can occur after only having more than certain deformation quantity. Deformation quantity is the biggest, and deformation stores can be the biggest, and deformation storage can be the biggest, and Recrystallization nucleation and growth rate are the biggest, even if Also can sufficiently rapidly start and complete recrystallization under lower temperature.And, deformation quantity increases, and also can reduce austenite recrystallization After crystallite dimension, this is because Recrystallization nucleation rate with deformation store can rising and the growth (Yong Qi of exponentially type relation Dragon writes, and micro alloyed steel-physics and mechanics are metallurgical), it is thus advantageous to obtain the phase-change product of more tiny γ → α, to improving steel The strong plasticity of band is all favourable.
The present invention controls finishing temperature >=900 DEG C, and hot rolling reduction ratio is 20-50%.By hot rolling, thickness of strips is thinning To 1.2mm and following, there is online recrystallization after hot rolling in austenite, so that steel band is through follow-up lead patenting The bainite structure of rear acquisition fine uniform.
Preferably, finishing temperature >=950 DEG C, hot rolling reduction ratio is 30-50%.
4) lead patenting, water-cooled and batch
Hot-rolled strip is carried out lead patenting.Austempering temperature and time can be to lath of bainite and cementite particles Size, and bainite transformation amount impacts, and then affects the performance of ultra-high strength package binding band.In bainite transformation temperature scope In, austempering temperature is the lowest, and the lath of bainite obtained is the thinnest, and cementite particle size is the least;Isothermal quenching time is more Long, bainite transformation amount is the biggest.The present invention controls the lead bath temperature of austempering and is 450-500 DEG C, and the cool time is 15-25s。
Completed the subsequent transition of fraction retained austenite by water-cooled, this is the most necessary for improving steel band intensity.
Steel band microscopic structure is mainly made up of bainite, a diameter of nanometer scale of its cementite particle, and containing a small amount of Martensite.Steel band tensile strength >=1250MPa, elongation percentage >=6.5%.
6) paint, wax or the subsequent treatment such as zinc-plated
Steel band can be turned blue according to the application target of ultra-high strength package binding band and use environment etc., paint, wax or plates The subsequent treatment such as zinc.
The difference of the present invention and prior art and beneficial effect:
1) technique of prior art production ultra-high strength package binding band is: tradition continuous casting+slab reheating+hot continuous rolling+cold rolling+ Cold rolling strap heating austenitizing+lead patenting;The present invention uses thin strap continuous casting+online hot rolling+lead patenting work Skill produces ultra-high strength package binding band, eliminates " slab reheating ", " hot continuous rolling ", " carrying out thinning to hot-rolled strip by cold rolling " and " right Cold rolling strap reheats austenitizing and processes " four processing steps, it is greatly simplified technological process.
2) ultra-high strength package binding band produced by the thin strap continuous casting of the present invention+online hot rolling economy technique, its performance and profit The ultra-high strength package binding band produced by prior art is suitable.
3) present invention produces the technology of ultra-high strength package binding band, and flow process is short, energy resource consumption is few, discharge is few.Solve prior art The problem that production efficiency is relatively low, production cost is higher existed.
Detailed description of the invention
Below in conjunction with embodiment, the present invention will be further described.
The molten steel of the embodiment of the present invention all uses electric furnace smelting to obtain, and specific chemical composition is as shown in table 1.After thin strap continuous casting The Cast Strip thickness obtained, Cast Strip cooldown rate, hot rolling finishing temperature, hot rolling reduction ratio, hot-rolled strip thickness, lead patenting temperature Spend and the time, and the tensile property of hot-rolled strip and high-strength tie is shown in Table 2.From table 2 it can be seen that ultra-high strength package binding band of the present invention Tensile strength >=1250MPa, elongation percentage >=6.5%.
The ladle chemistry (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 technological parameter of table 2 embodiment 1-5 and ultra-high strength package binding band tensile property
In sum, the present invention uses thin strap continuous casting+online hot rolling+lead patenting technique to produce superelevation and tie by force Band, eliminates " slab reheating ", " hot continuous rolling ", " carrying out thinning to hot-rolled strip by cold rolling " and " cold rolling strap is reheated Austria Family name's bodyization processes " four processing steps, it is greatly simplified technological process, energy resource consumption is few, discharge is few.Solve prior art to exist The problem that production efficiency is relatively low, production cost is higher.

Claims (6)

1. the thin strap continuous casting economy ultra-high strength package binding band of tensile strength >=1250MPa, its chemical component weight percentage ratio is: C 0.28~0.38%, Si 0.25~0.35%, Mn 1.64~1.8%, P≤0.015%, S≤0.01%, N≤0.012%, Remaining is Fe and inevitable impurity;Steel band microscopic structure is mainly made up of bainite, a diameter of nanometer of its cementite particle Magnitude;Its tensile strength >=1250MPa, elongation percentage >=6.5%;
The manufacture method of described thin strap continuous casting economy ultra-high strength package binding band comprises the steps:
1) according to above-mentioned chemical composition, the Cast Strip using twin-roll thin strip continuous casting cast thickness to be 1.0~2.4mm;
2) cooling down Cast Strip, cooldown rate is 20-80 DEG C/s;
3) Cast Strip carrying out online hot rolling, finishing temperature >=900 DEG C, hot rolling reduction ratio is 20~50%, the thickness of steel band after hot rolling , after Band by Hot-rolling, there is the online recrystallization of austenite in degree≤1.2mm;
4) hot rolled strip carrying out lead patenting, lead bath temperature is 450~500 DEG C, and the cool time is 15~25s;
5) steel band is carried out water-cooled and batches.
2. the thin strap continuous casting economy ultra-high strength package binding band manufacture method of tensile strength >=1250MPa, comprises the steps:
1) Cast Strip using twin-roll thin strip continuous casting cast thickness to be 1.0~2.4mm, its chemical component weight percentage ratio is: C 0.28~0.38%, Si 0.25~0.35%, Mn 1.64~1.8%, P≤0.015%, S≤0.01%, N≤0.012%, Remaining is Fe and inevitable impurity;
2) cooling down Cast Strip, cooldown rate is 20-80 DEG C/s;
3) Cast Strip carrying out online hot rolling, finishing temperature >=900 DEG C, hot rolling reduction ratio is 20~50%, the thickness of steel band after hot rolling , after Band by Hot-rolling, there is the online recrystallization of austenite in degree≤1.2mm;
4) hot rolled strip carrying out lead patenting, lead bath temperature is 450~500 DEG C, and the cool time is 15~25s;
5) steel band carrying out water-cooled and batches, steel band microscopic structure is mainly made up of bainite, and its cementite particle is a diameter of to be received Rice magnitude;Its tensile strength >=1250MPa, elongation percentage >=6.5%.
3. the thin strap continuous casting economy ultra-high strength package binding band manufacture method of tensile strength >=1250MPa as claimed in claim 2, its It is characterised by: described step 2) in, Cast Strip cooldown rate is 30-60 DEG C/s.
4. the thin strap continuous casting economy ultra-high strength package binding band manufacture method of tensile strength >=1250MPa as claimed in claim 2, its It is characterised by: described step 3) in, finishing temperature >=950 DEG C.
5. the thin strap continuous casting economy ultra-high strength package binding band manufacture method of tensile strength >=1250MPa as claimed in claim 2, its It is characterised by: described step 3) in, hot rolling reduction ratio is 30~50%.
6. the thin strap continuous casting economy ultra-high strength package binding band manufacture method of tensile strength >=1250MPa as claimed in claim 2, its It is characterised by: also include step 6) steel band is turned blue, paint, wax or zinc-plated subsequent treatment.
CN201410035057.5A 2014-01-24 2014-01-24 The thin strap continuous casting economy ultra-high strength package binding band of tensile strength >=1250MPa and manufacture method thereof Active CN103757530B (en)

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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
CN106282878B (en) * 2016-08-31 2018-09-04 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
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

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