CN103774041B - The high-strength tie of thin strap continuous casting economy of tensile strength >=1100MPa and manufacture method thereof - Google Patents
The high-strength tie of thin strap continuous casting economy of tensile strength >=1100MPa and manufacture method thereof Download PDFInfo
- Publication number
- CN103774041B CN103774041B CN201410035079.1A CN201410035079A CN103774041B CN 103774041 B CN103774041 B CN 103774041B CN 201410035079 A CN201410035079 A CN 201410035079A CN 103774041 B CN103774041 B CN 103774041B
- Authority
- CN
- China
- Prior art keywords
- strength
- continuous casting
- hot
- 1100mpa
- tensile strength
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The high-strength tie of thin strap continuous casting economy of tensile strength >=1100MPa and manufacture method thereof, it comprises the steps: 1) to use double roller continuous casting cast thickness be the Cast Strip of 1.0 5.0mm, its chemical component weight percentage ratio is: C0.25 0.40%, Si0.15 0.40%, Mn1.3 2.0%, P≤0.015%, S≤0.01%, N≤0.012%, in addition, also comprise at least one in microalloy element Nb, V, Ti, Mo, Nb0.01 0.06%, V0.01 0.06%, Ti0.01 0.06%, Mo0.10 0.25%, remaining is Fe and inevitable impurity；2) Cast Strip cooling；3) the online hot rolling in Cast Strip；4) hot-rolled strip cooling；5) batch；6) cold rolling；7) blue annealing.The high-strength tie that the present invention is produced by the economy technique carrying out recovery annealing after thin strap continuous casting+cold rolling, tensile strength >=1100MPa, elongation percentage >=12%.
Description
Technical field
The present invention relates to high strength steel tie and manufacture method thereof, particularly relate to a kind of tensile strength
The thin strap continuous casting economy high strength steel tie of >=1100MPa 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 fortune
Defeated, it is desirable to tie has higher tensile strength and certain elongation percentage.Additionally, due to tie is long-term
Use in outdoor environment, it is also desirable to have certain corrosion resistance.
Steel tie divides according to intensity, can be divided into low strong, in strong, high-strength and strong four classes of superelevation.Wherein
High-strength tie, be mainly used in tying up in iron and steel enterprise coils of hot-rolled steel, round steel, shaped steel, steel pipe,
The product such as wire rod and pipe line steel, it is in great demand.
Along with developing rapidly of metallurgy industry, high-quality, the steel products volume of production of high intensity grade are got over
Coming the biggest, the coil diameter of coil of strip is also increasing, and monovolume reaches 30 tons, even 40 tons, strong for tie
The requirement of degree improves constantly, and consumption is also constantly increasing.Therefore, the height that low cost process produces is used
Strength steel tie has boundless market prospect.
But, owing to high strength steel tie requires have higher intensity and elongation percentage simultaneously, therefore give birth to
Dystocia degree is bigger.At present, the production technology of high strength steel tie mainly has three kinds:
One, the technique carrying out recovery annealing process after cold rolling.
This technique generally includes following steps: 1) utilize tradition continuous casting+slab reheating+hot continuous rolling
Technique produces hot-rolled strip；2) by cold rolling thickness hot-rolled strip being thinned to required for high-strength tie；3)
Cold rolling strap is carried out blue annealing process.
Hot rolled strip intensity after cold rolling is largely increased, but elongation percentage falls too low.By replying
After annealing, steel band intensity decreases, but elongation percentage is improved, so that steel band reaches one
Fixed strong plasticity coupling, forms blue layer oxide-film in steel strip surface simultaneously, plays antioxidative and makees
With.The final microscopic structure of steel band usually cold working recovery annealing ferrite matrix and spread all over matrix more
Dissipate carbide.This technological operation is simple, with low cost, energy resource consumption is few, environmental pollution is little.
Owing to first tensile strength and the elongation percentage of tie are to be affected by hot rolling material performance, then pass through
Cold rolling power rate and annealing treating process regulate.It is not the most that high-strength tie produces specially
The hot rolling raw material of design, high-strength tie produces and is generally selected the alloy being mainly composed of C, Si, Mn
Structural steel.Organization type and the various composition phase content of this kind of hot-rolled product of the market supply of material fluctuate relatively
Greatly, determining that its tensile property changes greatly, so it will ripple to the influence degree of high-strength tie performance
Dynamic bigger；Additionally the thickness specification of this kind of hot-rolled product of the market supply of material compares limitation, if different thick
The high-strength tie of degree uses the hot rolled plate of similar thickness to produce, then the change model of cold rolling reduction ratio
Enclosing the biggest, the Hot Rolling Plate Production thickness for example with 2.8mm is respectively 1.0mm's and 0.5mm
High-strength tie, cold rolling reduction ratio is respectively 64% and 82%, its performance impact degree to high-strength tie
Will fluctuate bigger.Two above fluctuation determines for different hot rolling raw materials, it is necessary to use difference
Annealing process carry out the last adjustment of tie performance, otherwise tie performance can be very different.Moving back
During ignition technique adjusts, tie performance is very sensitive to parameter and annealing, when tie tensile strength
Time higher, elongation percentage is the most relatively low；And when the elongation percentage of tie is higher, tensile strength is the most relatively low,
Tie to be made has higher intensity and elongation percentage simultaneously, relatively difficult.Above-mentioned reason causes, and utilizes
Carrying out the steel tie that recovery annealing process technique produces after cold rolling, its tensile strength and elongation percentage are difficult to prominent
Broken 980MPa and 12%.This technique seems simple, must with production tensile strength and elongation percentage have
The more preferably high-strength tie of coupling, difficulty is bigger.
Chinese patent 02109635.X open " a kind of high-intensity packing steel belt and Technology for Heating Processing ", its
Employing composition is C0.22-0.29%, Si0.015%, Mn1.30-1.50%, P≤0.015%, S≤
0.010%, Als0.015%, Nb0.012%, surplus is the hot rolled plate raw material of Fe, cold rolling after carry out
Electrical heating blue annealing processes, and annealing furnace temperature is 550-650 DEG C, and steel belt operating speed is
Its speed of 2.5-3.5m/min(is directly proportional to furnace temperature and body of heater length).Utilize the steel that this patent produces
Tie tensile strength reaches 920MPa, and elongation percentage reaches 11%.
Chinese patent 200410031162.8 disclosed " high-intensity packing steel belt and manufacturing process thereof ", its
Using composition is C0.25-0.28%, Si0.02-0.06%, Mn1.30-1.50%, P0.01-0.02%,
S0.001-0.012%, Als0.03-0.06%, surplus is the hot rolled plate raw material of Fe, and hot rolled plate thickness is
1.8-3.75mm, after 68-83% is cold rolling, obtaining thickness is 0.3-1.2mm steel band, utilizes continuous way
Heating furnace makes annealing treatment, and steel band heating-up temperature is 450-550 DEG C.Utilize the steel that this patent produces
Tie tensile strength >=930MPa, elongation percentage >=8%.
Chinese patent 201210232927.9 disclosure " production method of high intensity blue steel strip ", it uses
C0.19-0.21%, Mn1.62-1.71%, Si0.02-0.028%, P0.014-0.018%, S
0.0042-0.006%, Als0.033-0.05%, surplus is the composition design of Fe, through smelting, even
The processing steps such as casting, hot rolling, cold rolling, blue annealing carry out steel tie production.Cold rolling reduction ratio is 70%,
Blue annealing temperature is 580-700 DEG C, and the time of turning blue is 100-160s.Utilize the steel that this patent produces
Tie tensile strength is 950-960MPa, and elongation percentage is 11.5-12%.
Two, the technique of cold rolling laggard quadrat bath means of isothermal quenching.
This technique generally includes following steps: 1) utilize tradition continuous casting+slab reheating+hot continuous rolling
Technique produces hot-rolled strip；2) by cold rolling thickness hot-rolled strip being thinned to required for high-strength tie；3)
Carry out heating austenitizing to the steel band after cold rolling；4) lead patenting.
Pass through lead patenting, it is thus achieved that bainite structure, thus obtain steel band intensity to be wanted and
Plasticity.The greatest problem utilizing this technique to produce is to produce device structure complexity, expensive, equipment
Cost is high；Lead bath cooling capacity is limited, needs time enough to complete austenite to bainite transformation,
Production efficiency is low；Serious environmental pollution can be caused；Production cost is high.Some countries have started to limit
Use.And, although the steel tie intensity utilizing this technique to produce is higher, but elongation percentage is relatively low,
Brittle failure it is susceptible to during use.
United States Patent (USP) US6814817 is disclosed " Steel Strap Composition ", and composition is C by it
The cold-rolled strip of 0.30-0.36%, Mn0.90-1.25%, Si0.75-1.10%, is initially pre-heated to
370-510 DEG C, it is then heated to 815-900 DEG C and carries out Ovshinsky, then carry out 370-510 DEG C of lead bath etc.
Temperature Quenching Treatment.Utilize steel tie tensile strength >=1170MPa that this technique produces, elongation percentage >=6.5%.
Chinese patent 200810200449.7 disclosed " heat treatment method of a kind of steel belt for packages ", adopts
It is C0.29-0.35% with composition, Si0.15-0.35%, Mn1.20-1.55%, P0.030%, S
0.030%, surplus is the hot rolled plate of Fe, cold rolling after first in lead bath, be preheating to 355-365 DEG C, in advance
Heat time 6.75-9s, is then heated to 860 ± 20 DEG C, and insulation 30-40s carries out austenitizing, then enters
355-365 DEG C of lead patenting of row processes, and isothermal quenching time is 21-28s.Utilize this technique raw
The steel tie tensile strength >=1350MPa produced, elongation percentage >=6%.
Three, the technique carrying out two-phase section Quenching Treatment after cold rolling.
This technique generally includes following steps: 1) utilize tradition continuous casting+slab reheating+hot continuous rolling
Technique produces hot-rolled strip；2) by cold rolling thickness hot-rolled strip being thinned to required for high-strength tie；3)
Steel band after cold rolling is heated to ferrite and austenite two-phase section；4) rapid quenching.
Quenched by two-phase section, it is thus achieved that microscopic structure be martensite+cold working recovery annealing ferrite
Matrix and the diffusion carbide spreading all over matrix, thus obtain steel band intensity to be wanted and plasticity.Utilize
The steel tie that this technique produces, intensity and elongation percentage are the highest.But this technique Structure of need complexity
Electromagnetic induction rapid-heating device and strength water cooling equipment, equipment cost is high；Production process is more complicated,
Production cost is higher；And thin plate is the most not ideal enough in two-phase section quenching back plate shape.
United States Patent (USP) US6635127 is disclosed " Steel strapping and method of making ",
It uses composition to be C≤0.2%, Mn≤2.0%, Si0.2-0.4%, Ti0.025-0.045%, V
0.05-0.07%, Cr≤0.25%, Ni≤0.30%, Mo≤0.10%, Cu≤0.20%, Al≤0.08%,
Nb≤0.005%, N≤0.005%, P≤0.035%, S≤0.02%, surplus is the steel billet warp of Fe
Hot rolling, cold rolling after, quickly sensing is heated to 750 DEG C, is incubated 2s, is then rapidly quenched to room temperature.Utilize
The steel tie tensile strength that this technique produces is 970-1070MPa, and elongation percentage is 10-14%.
Chinese patent 200910046229.8 " tensile strength high-strength binding band steel higher than 1100MPa and
Its manufacture method ", employing C0.25-0.35%, Mn1.24-2.0%, Si≤0.45%, S≤0.04%,
The composition design of P≤0.04%, through smelting, continuous casting, hot rolling, cold rolling, ferrite+austenite two
The processing steps such as phase region quenching, tempering carry out steel tie production.Hardening heat is 730-790 DEG C, quenches
>=100 DEG C/s of degree at top speed, temperature is 430-530 DEG C.Utilize the steel tie tension that this technique produces
Intensity >=1100MPa, elongation percentage >=10%.
In above-mentioned patent, produce the hot-rolled strip raw material that high-strength tie is used, be all to utilize tradition even
Casting+hot rolling technology flow process produces.Due to the specification of hot-rolled strip raw material own, tissue, the limit of aspect of performance
System, and the restriction of the operation such as follow-up cold rolling, heat treatment itself so that utilize above-mentioned technique to produce
High-strength tie production cost or performance are difficult to obtain and break through.
At present, some emerging technologies, such as CSP, thin strap continuous casting etc., it is also possible to use
Produce hot-rolled strip.Wherein, a forward position in strip continuous casting technology is metallurgy and investigation of materials field
Technology, its steel and iron industry that appears as brings a revolution, and it changes tradition and controls hot rolling in metal working industry
The production process of steel band, by casting continuously, roll, even heat treatment etc. integrates, and makes production
Strip base the most disposably form thin steel strip through the online hot rolling of a time, enormously simplify production work
Sequence, shortens the production cycle.Equipment 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 (LC) is micro-
Alloy steel product and manufacturing process thereof, the aspect such as product surface quality improvement, such as Chinese patent
201080008606.X " hot rolled thin cast steel strip product and manufacture method thereof ", Chinese patent
" 201080017436.1 high strength thin cast strip product and preparation method thereof ", Chinese patent
" 200880109715.3 thin strip slab that micro-crack is reduced " etc..
The steel band manufactured by above-mentioned thin strap continuous casting patent, is not to design for high-strength tie produces,
Have not yet to see and the steel band that thin band continuous casting technique produces is used for the precedent that high-strength tie produces.Actual
On, the final performance of high-strength tie is by the specification of hot rolling carrying raw material, and hot-rolled strip tissue and performance shadow
Ring relatively big, during in particular by the first technique of relatively inexpensive high-strength tie production.Therefore,
Want that the steel band using thin band continuous casting technique to produce, as raw material, produces to economy the height of excellent performance
Strong tie, carries out specialized designs and manufacture to thin strap continuous casting steel band, most important.
Summary of the invention
The thin strap continuous casting economy that it is an object of the invention to provide a kind of tensile strength >=1100MPa is high
Strong tie and manufacture method thereof, designed by rational composition design and processes, to solve prior art
The problem that environmental pollution is serious, production efficiency is relatively low, production cost is high existed, and utilize existing
The strong plasticity of high-strength tie that economy technology produces mates undesirable problem.
To achieve the object of the present invention, the present invention adopts the following technical scheme that
The present invention use cold rolling after carry out the processing technology routine of recovery annealing process to produce high-strength bundle
Band.Taking this process route to produce high-strength tie, its performance design mainly considers three aspects: one is
By the proper property of the produced Cast Strip of thin band continuous casting technique, mainly determined by composition and tissue morphology；
Two is cold rolling working hardening, is mainly determined by cold rolling reduction ratio；Three is that recovery annealing matrix softens and micro-
Alloying element precipitation strength, the former mainly determines by the annealing process after cold rolling, and the latter is by alloying element
Content and annealing process together decide on.Closely, each side is both needed in contact between these three aspect
Want stability contorting, and the stability contorting of a rear step must obtain the base of stability contorting at back
Just can be achieved on plinth, thus realize the high-strength tie ideal coupling of strong plasticity, it is achieved the present invention
Effect.
The present invention is designed by chemical composition and thin band continuous casting technique, the microscopic structure type to hot-rolled strip
Carry out fixing quantity with composition phase content, the existence of added microalloy element be controlled,
And then the mechanical property of stability contorting hot-rolled strip, and the impact on high-strength tie mechanical property.Pass through
Thin band continuous casting technique designs, and accurately controls the thickness specification of hot-rolled strip, and then stability contorting is not
The high-strength tie of stack pile produces the cold rolling reduction ratio used, and the shadow to high-strength tie mechanical property
Ring.And design is suitable for thin strap continuous casting hot-rolled strip microscopic structure type, cold rolling reduction ratio, and can
Realize the blue annealing technological parameter that in steel band, microalloy element separates out.By after thin strap continuous casting+cold rolling
Carry out the economic production technique of recovery annealing, it is achieved high-strength tie tensile strength and elongation percentage more excellent
Coupling.
Concrete, the high-strength tie of thin strap continuous casting economy of the tensile strength >=1100MPa of the present invention,
Its chemical component weight percentage ratio is: C0.25-0.40%, Si0.15-0.40%, Mn1.3-2.0%, P
≤ 0.015%, S≤0.01%, N≤0.012%, additionally it contained microalloy element Nb, V, Ti,
In Mo at least one, Nb0.01-0.06%, V0.01-0.06%, Ti0.01-0.06%, Mo
0.10-0.25%, remaining is Fe and inevitable impurity.
In the Design of Chemical Composition of the present invention:
C:C is intensified element most economical, most basic in steel, by solution strengthening and precipitation strength
Improve the intensity of steel.C can be dissolved in ferrite formation interstitial solid solution, but at room temperature it is at ferrum
Dissolubility in ferritic is extremely limited, and therefore its solution strengthening effect is restricted.At present invention process
Under the conditions of, C mainly separates out with cementite form, as the ingredient of pearlite.Containing of pearlite
Measuring closely related with C content, when C content increases, content of pearlite in alloy increases, the intensity of steel, hard
Degree improves therewith, and plasticity, toughness reduce accordingly.Therefore C content can not be too high, and the present invention uses
C content scope be 0.25-0.40%.
Preferably, C content scope is 0.28-0.38%, and steel band can obtain more suitably content of pearlite in alloy,
Can have more excellent tensile strength and elongation percentage coupling.
Si:Si plays solution strengthening effect in steel.When Si content is suitable, the intensity of steel is not only made to obtain
Improve, and little on plasticity impact.The Si content range that the present invention uses is 0.15-0.4%.
Preferably, Si content range is 0.25-0.35%, and steel band can have more excellent tensile strength and prolong
Stretch rate coupling.
Mn:Mn is one of generally the least expensive alloying element of price, and it has sizable solid solution in steel
Degree, improves the intensity of steel by solution strengthening, and when its content is suitable, to the plasticity of steel substantially without
Infringement, is the topmost intensified element of intensity improving steel in the case of reducing C content.The present invention adopts
Mn content range be 1.3-2.0%.
Preferably, Mn content range is 1.5-1.8%, and steel band can have more excellent tensile strength and prolong
Stretch rate coupling.
P:P dissolubility in α-Fe is the biggest.Compared with other elements, P is caused in α-Fe
Solid solution strengthening effect is bigger.But when P content is higher, along with the intensity of steel improves, its plasticity is obvious
Reduce.In the case of particularly segregation occurs in P in steel, 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, its harm be
The red brittleness of steel can be caused when carrying out hot-working, reduce ductility and the toughness of steel, cause when rolling
Crackle.In the present invention, S is to control as impurity element, its content≤0.01%.
N: similar with C element, N element can improve the intensity of steel by gap solid solution, but, N
Gap solid solution plasticity and the toughness of steel are had bigger harm, therefore N content can not be too high.The present invention
N content≤0.012% used.
Nb, V, Ti, Mo: in the high-strength steel of Traditional control rolling, often add microalloy element
Nb, V, Ti, Mo, main performance two aspect effects: is that after suppressing hot rolling, austenite occurs to tie again
Brilliant, it is achieved the purpose of deformation fining austenite grains.Microalloy element can pass through solute atoms towing aircraft
System, and the Second Phase Particles pinning mechanism that separated out and effectively stop big angle crystal boundary and sub boundary
Migrating, thus stop recrystallization process significantly, wherein Second Phase Particles stops the effect of recrystallization more
For significantly；Two is the effect playing precipitation strength.
In thin band continuous casting technique, due to steel band rapid solidification and the quick cooling characteristics of its uniqueness, as
The amount that fruit adds microalloy element is suitable, and microalloy element will mainly be present in steel band with solid solution state,
Even if steel band is cooled to room temperature, the most also it is barely perceivable the precipitation of microalloy element.Cause
This, microalloy element can only pass through solute atoms drag mechanism, suppresses austenite recrystallization, and it is made
With being limited.In the present invention, it is undesirable to recrystallization occurs after austenite hot rolling, mainly passes through
Control (see below the elaboration about manufacturing process of the present invention) that hot rolling reduction ratio realizes.The present invention
Add microalloy element, mainly play its precipitation strength effect.It has been mentioned hereinbefore that at strip even
Under the conditions of casting process, main solid solution state is present in steel band by the microalloy element added, and solid solution is strong
The effect changed is limited.Only when alloying element is with tiny, the precipitate form of disperse state distribution
In the presence of, its strengthening effect is optimal.
The high-strength tie manufacture of the present invention is by the economy by carrying out recovery annealing after thin strap continuous casting+cold rolling
Property production technology realizes.The microalloy element existed with solid solution state in thin strap continuous casting hot-rolled strip, will
Annealing process after cold rolling separates out, but must is fulfilled for two preconditions.First
Individual precondition be the design content of microalloy element be suitable.If microalloy element content mistake
Height, it is possible to separate out in thin strap continuous casting hot-rolled strip, then in subsequent anneal processing procedure,
Precipitate can be grown up further, thus causes steel band intensity to reduce.If microalloy element content is too low,
Although will not separate out in hot-rolled strip, but precipitate limited amount during annealing, invigoration effect is limited,
High-strength tie performance design requirement can not be met.Second precondition is, the design of annealing process is
Reasonably (see below the elaboration about manufacturing process of the present invention).
In a word, microalloy element to be controlled does not separates out in hot-rolled strip, and its content can not be the highest；
Microalloy element to be made can play enough invigoration effects, meets high-strength tie performance design requirement, its
Content can not be the lowest.Nb, V, Ti content range that the present invention uses is all 0.01-0.06%, Mo
Content range is 0.10-0.25%.
Preferably, the content range of Nb, V, Ti is 0.01-0.05%, and steel band can have more excellent strong
Degree and plasticity proportioning.
The thin strap continuous casting economy high-strength tie manufacture method of the tensile strength >=1100MPa of the present invention,
Comprise the steps:
1) using twin-roll thin strip continuous casting cast thickness is the Cast Strip of 1.0-5.0mm, its chemical composition
Percentage by weight is: C0.25-0.40%, Si0.15-0.40%, Mn1.3-2.0%, P≤
0.015%, S≤0.01%, N≤0.012%, additionally it contained microalloy element Nb, V,
In Ti, Mo at least one, Nb0.01-0.06%, V0.01-0.06%, Ti0.01-0.06%,
Mo0.10-0.25%, remaining is Fe and inevitable impurity；
2) cooling down Cast Strip, cooldown rate is 20-80 DEG C/s；
3) Cast Strip is carried out online hot rolling, finishing temperature >=900 DEG C, hot rolling reduction ratio≤10%, hot rolling
The thickness of rear steel band is 0.9-5.0mm；
4) cooling down hot-rolled strip, cooldown rate is 10-50 DEG C/s；
5) batching hot-rolled strip, coiling temperature is 630-730 DEG C；Hot-rolled strip microscopic structure is by 80%
Above pearlite, and polygonal ferrite and acicular ferrite are constituted on a small quantity, and pearlite
Middle cemetite lamellae layer thickness is nanometer scale, and cemetite lamellae interlamellar spacing is nanometer or submicron amount
Level；
6) carrying out cold rolling to hot-rolled strip, cold rolling reduction ratio is 65-75%, and cold rolling rear thickness of strips is
0.3-1.2mm；
7) cold rolling strap being carried out blue annealing, annealing temperature is 550-600 DEG C, and annealing time is
120-180s.Microscopic structure after cold rolling strap annealing, on the ferrite matrix of recovery annealing
Dispersed precipitate cementite particle or the cementite stub of a diameter of nanometer scale, and chi
The very little microalloy element precipitate for nanometer scale.
Further, in described step 1), the content range of C is 0.28-0.38%, with weight percent
Than meter.
In described step 1), the content range of Mn is 1.5-1.8%, by weight percentage.
In described step 1), the content range of Si is 0.25-0.35%, by weight percentage.
In described step 1), the content range of Nb, V, Ti is 0.01-0.05%, with weight hundred
Proportion by subtraction meter.
Also, described step 2) in, Cast Strip cooldown rate is 30-60 DEG C/s.
In described step 3), hot rolling reduction ratio is 5-10%.
In described step 4), hot-rolled strip cooldown rate is 10-40 DEG C/s.
In described step 5), the tensile strength of hot-rolled strip is 680-730MPa, elongation percentage >=15%.
It addition, in described manufacture method, it is also possible to increase step 8) as required and steel band is coated with
Paint or the subsequent treatment such as zinc-plated.
The high-strength tie obtained by above technical scheme, its tensile strength >=1100MPa, elongation percentage
≥12%。
In the manufacturing process of the present invention:
1) thin strap continuous casting
Molten steel is introduced in a pair and rotates against and that the crystallization roll of internal water cooling and side seal board are formed is molten
Within pond, after rapid solidification, direct pouring goes out the Cast Strip that thickness is 1.0-5.0mm.This finger gauge
Lattice pass through high-strength tie finished product thickness, and the online hot rolling reduction ratio of subsequent design and cold rolling strengthening institute
Reduction ratio inverse is needed to obtain.
2) Cast Strip cooling
Cast Strip from crystallization roll continuous casting out after, through confined chamber, cool down in confined chamber.In order to
Control inside, Cast Strip and surface quality, prevent austenite crystal from high temperature growing up too fast simultaneously, control
The cooldown rate of Cast Strip is 20-80 DEG C/s.Preferably, the cooldown rate of Cast Strip is 30-60 DEG C/s.Casting
Band cooling uses air cooling mode, the cooling pressure of gas, the gentle nozzle location of flow can to regulate and control
System.Cooling gas can be the noble gases such as argon, nitrogen, helium, or several gas is mixed
And gas.By controlling the cooling type of gas, pressure, flow, and nozzle is between Cast Strip
Distance etc., it is achieved the control to Cast Strip cooldown rate.
3) the online hot rolling in Cast Strip, cool down and batch
The performance of high-strength tie is had a significant impact by the tensile property of hot-rolled strip.Produce same intensity rank
High-strength tie, the performance of hot-rolled strip used should not change too big, otherwise cannot realize high-strength bundle
Stability contorting with performance.The performance of hot-rolled strip is determined by composition and organization type.Hot-rolled strip to be controlled
Stable performance, its organization type and composition phase content should be stablized as far as possible.Because organization type is cold to steel band
The ability resisting recrystallization after rolling also has considerable influence, and therefore tissue stabilization is also beneficial to cold rolled annealed work
Skill designs.
The control of organization type and tissue phase content is mainly realized by hot rolling reeling process.
The present invention controls temperature >=900 DEG C processed eventually, makes hot rolling carry out in austenitic area.
The present invention controls hot rolling reduction ratio≤10%, it is preferred that hot rolling reduction ratio is 5-10%.After hot rolling
The thickness range of steel band is 0.9-5.0mm.In actual production, the thickness of hot-rolled strip is by be produced
High-strength tie thickness specification, and needed for cold rolling processing, reduction ratio carries out inverse.Such as, thickness is produced
Degree is the high-strength tie of 0.5mm, and required cold rolling reduction ratio is 65%, then the thickness of hot-rolled strip should
For 1.43mm.Product thickness specification can be realized by adjustment thin band continuous casting technique parameter to change flexibly,
This is a big advantage of strip continuous casting technology.
Being controlled by hot rolling reduction ratio in such scope, reason has three: first, by a small amount of hot rolling
Improve inside, Cast Strip and surface quality further；Second, in order to make austenite the most not occur again
Crystallization, hot rolling drafts can not be the biggest.Deformation is the basis that recrystallization occurs, and is the driving of recrystallization
Power deformation stores the source of energy, owing to just can occur to tie after must be over certain driving force again
Crystalline substance, therefore recrystallization just can occur after only having more than certain deformation quantity.Deformation quantity is the biggest, and deformation is stored up
Depositing can be the biggest, and deformation storage can be the biggest, and Recrystallization nucleation and growth rate are the biggest, even if relatively
Also can sufficiently rapidly start and complete recrystallization under low temperature.Once austenite occurs after hot rolling again
Crystallization, austenite structure stability is difficult to control, and in turn results in by controlling follow-up cooling and batching
The content of pearlite in alloy generation larger fluctuation that technological parameter is obtained, thus affect the steady of steel band tensile property
Fixed control.3rd, make that hot-rolled strip thickness will not subtract is the thinnest.Because producing high-strength tie to also need to
Ensureing certain reduction ratio in follow-up cold rolling step, the control thinking of reduction ratio is as detailed below.
Use the modes such as aerosol cooling, section cooling or spraying cooling that hot-rolled strip is cooled down.Cold
But the flow of water, flow velocity, and outlet position etc. can regulate, thus realize hot-rolled strip is cooled down
The control of speed.It is 10-50 DEG C/s that the present invention controls the cooldown rate of hot-rolled strip, it is preferred that hot-rolled strip
Cooldown rate be 10-40 DEG C/s.The speed of cooldown rate determines last coiling temperature.Technical process
In, different cooldown rates need to be taked according to the difference of thin strap continuous casting steel band pulling rate and tape thickness, will
Oiler temperature control is in desired scope.
The present invention controls the coiling temperature of hot-rolled strip and is 630-730 DEG C, in the range of this coiling temperature,
The microscopic structure of hot-rolled strip can be controlled by more than 80% pearlite, and a small amount of polygonal ferrite and
Acicular ferrite is constituted.And cemetite lamellae layer thickness is nanometer scale in pearlite, cemetite lamellae interlayer
Away from for nanometer or sub-micrometer scale.Having the hot-rolled strip of this microscopic structure, its tensile strength is
680-730MPa, elongation percentage >=15%.
4) hot-rolled strip is carried out cold rolling
The cold rolling reduction ratio of hot-rolled strip is very big to the performance impact of high-strength tie, is to improve tie performance
Important parameter, the performance of tie can increase along with the increase of cold rolling reduction ratio.Produce same intensity level
Other high-strength tie, cold rolling reduction ratio should not change too big, otherwise cannot realize high-strength tie
The stability contorting of energy.And cold rolling reduction ratio changes the most greatly to the ability resisting recrystallization after cold rolling band steel
Also having considerable influence, thus have influence on the selection of parameter and annealing, this also can affect high-strength tie
The stability contorting of performance.It addition, the design of cold rolling reduction ratio total amount, high-strength tie performance should be met and set
Meter requirement, guarantees that material does not ftractures in cold-rolled process again, can not be formed at material internal
Micro-crack.The hot-rolled strip that the present invention obtains, in microscopic structure, more than 80% is pearlite, cemetite lamellae
Layer thickness is nanometer scale, can elongate, the deformation of the form such as bending in cold-rolled process, no
Easily occur broken, thus will not cause defect at material internal.Based on above-mentioned consideration, control of the present invention
It is 65-75% that refrigeration rolls reduction ratio, changes in the range of 10%.
5) cold rolling strap blue annealing
The selection of parameter and annealing is most important.Its reply behavior that matrix material is annealed should be considered
Impact, consider its impact on microalloy element pick-up behavior again.The former will cause steel band intensity
Reduce elongation percentage to improve；The latter can cause steel band intensity to improve, after thin strap continuous casting hot-rolled strip is cold rolled annealed,
When precipitation size is the most tiny, usually below tens nanometers, the elongation percentage of steel band is affected little.
Therefore annealing temperature can not too high or time can not be long, otherwise can reply due to matrix and cause steel
Band strength declines too many, causes owing to precipitation size is excessive and reduces intensity contribution；Annealing temperature is also
Can not be too low or the time is too short, otherwise can be caused by matrix and reply the elongation percentage caused and go up not,
Insufficient not enough to intensity contribution owing to separating out.Suitably annealing temperature and the time is the most corresponding, is extending
In the case of rate gos up to reach requirement, matrix is replied the intensity reduction caused and is passed right through precipitation strength
Make up.
Selecting suitable parameter and annealing when, also to simultaneously take account of, the height of annealing temperature
The biggest with hot-rolled strip microscopic structure type and cold rolling reduction ratio relation.The hot-rolled strip that the present invention obtains, aobvious
In micro-assembly robot, more than 80% is pearlite, and cemetite lamellae layer thickness is nanometer scale, cemetite lamellae interlayer
Away from for nanometer or sub-micrometer scale, make material relative to Recovery and recrystallization resistivity in annealing process
Stronger.It addition, the nanoscale precipitate formed in annealing process also can improve material opposing recrystallization
Ability, therefore can properly increase annealing temperature and or annealing time.
In view of above-mentioned, the present invention controls annealing temperature and is 550-600 DEG C, and annealing time is 120-180s.
Under the conditions of this annealing process, the microscopic structure of steel band is that on the ferrite matrix of recovery annealing, disperse divides
Cloth cementite particle or the cementite stub of a diameter of nanometer scale, and a size of tens nanometers
Following microalloy element precipitate.Tie finally obtains ideal tensile strength and elongation percentage
Coupling.
6) japanning or the subsequent treatment such as zinc-plated
According to the application target of high-strength tie and use environment etc., the steel band after blue annealing can be entered
Row japanning or the subsequent treatment such as zinc-plated.
The difference of the present invention and prior art and beneficial effect:
1) the high-strength tie of existing production cold rolling after carry out the technique of recovery annealing process, not to hot rolling
Composition phase content and hot rolling raw thickness specification in raw material microscopic structure are controlled, and cause steel band
Tensile strength and elongation percentage coupling are undesirable, are difficult to break through 980MPa and 12%.
Designed by the thin band continuous casting technique of the present invention, control micro-group of thin strap continuous casting hot-rolled strip
Knit the content mainly comprising phase in type, and fixing quantity microscopic structure；Control the microalloy added
Element is in solid solution condition and does not separates out；Thin according to high-strength tie thickness specification inverse to be produced
Thickness with continuous casting hot-rolled strip also accurately controls.And then the mechanical property of stability contorting hot-rolled strip and
The impact on high-strength tie mechanical property of the cold rolling reduction ratio.It is micro-that design is suitable for thin strap continuous casting hot-rolled strip
The blue annealing technological parameter of organization type and cold rolling reduction ratio, gos up to reach the feelings of requirement at elongation percentage
Under condition, matrix is replied the intensity reduction caused and is made up by microalloy element precipitation strength, it is achieved
High-strength tie tensile strength and the more excellent coupling of elongation percentage, tensile strength >=1100MPa, elongation percentage
≥12%。
2) technique of the high-strength tie of prior art production is: tradition continuous casting+slab reheating+heat is even
Roll+cold rolling+recovery annealing or lead patenting or two-phase section quenching.The present invention produces high-strength tie
Technique be: carry out recovery annealing after thin strap continuous casting+online hot rolling+cold rolling, shorten technological process,
Simplify processing step, after the high-strength tie performance produced is better than utilizing existing tradition continuous casting+cold rolling
Carry out the high-strength tie of recovery annealing technique production, be better than or close to utilizing existing lead patenting
The high-strength tie that technique and two-phase section isothermal quenching technique produce.
3) present invention produces the technology of high-strength tie, flow process is short, technological operation is simple, with low cost,
Energy resource consumption is few, discharge less, environmental pollution little.Solve the environmental pollution that prior art exists serious,
The problem that production efficiency is relatively low, production cost is high, and utilize that existing economy technology produces high-strength
The problem that tie strong plasticity coupling is undesirable.
Detailed description of the invention
Below in conjunction with embodiment, the present invention will be further described.
The molten steel of embodiment of the present invention 1-8 all uses electric furnace smelting to obtain, specific chemical composition such as table 1
Shown in.
The Cast Strip thickness obtained after thin strap continuous casting, Cast Strip cooldown rate, hot rolling finishing temperature, hot rolling
Lower rate, hot-rolled strip thickness, hot-rolled strip cooldown rate, coiling temperature, cold rolling reduction ratio, annealing temperature,
The technological parameters such as annealing time are shown in Table 2；The tensile property of hot-rolled strip and high-strength tie is shown in Table 3.
From table 3 it can be seen that the tensile strength >=1100MPa of the high-strength tie of the present invention, elongation percentage >=
12%。
The ladle chemistry (wt.%) of table 1 embodiment 1-8
| Embodiment | C | Si | Mn | P | S | N | Nb | V | Ti | Mo |
| 1 | 0.30 | 0.28 | 1.30 | 0.013 | 0.004 | 0.0047 | 0.010 | 0.030 | 0.14 | |
| 2 | 0.32 | 0.34 | 1.45 | 0.013 | 0.006 | 0.0060 | 0.026 | 0.028 | ||
| 3 | 0.40 | 0.15 | 1.76 | 0.011 | 0.004 | 0.012 | 0.045 | 0.10 | ||
| 4 | 0.35 | 0.32 | 2.00 | 0.012 | 0.003 | 0.0092 | 0.060 | |||
| 5 | 0.25 | 0.39 | 1.69 | 0.015 | 0.005 | 0.0078 | 0.048 | |||
| 6 | 0.29 | 0.18 | 1.50 | 0.012 | 0.003 | 0.0052 | 0.011 | 0.043 | 0.25 | |
| 7 | 0.32 | 0.30 | 1.81 | 0.015 | 0.008 | 0.0048 | 0.060 | |||
| 8 | 0.33 | 0.36 | 1.92 | 0.010 | 0.005 | 0.0063 | 0.059 | 0.010 |
Table 2
Table 3
Claims (15)
1. the high-strength tie of thin strap continuous casting economy of tensile strength >=1100MPa, its chemical component weight percentage
Ratio is: C 0.25-0.40%, Si 0.15-0.40%, Mn 1.3-2.0%, P≤0.015%, S≤
0.01%, N≤0.012%, additionally it contained in microalloy element Nb, V, Ti, Mo at least
One, Nb 0.01-0.06%, V 0.01-0.06%, Ti 0.01-0.06%, Mo 0.10-0.25%,
Remaining is Fe and inevitable impurity；Steel band microscopic structure is the ferrite matrix of recovery annealing
Upper Dispersed precipitate cementite particle or the cementite stub of a diameter of nanometer scale, and chi
The very little precipitate for nanometer scale；
The manufacture method of the described high-strength tie of thin strap continuous casting economy comprises the steps:
1) using twin-roll thin strip continuous casting cast thickness is the Cast Strip of 1.0-5.0mm, its chemical composition
Percentage by weight is described above；
2) cooling down Cast Strip, cooldown rate is 20-80 DEG C/s；
3) Cast Strip is carried out online hot rolling, finishing temperature >=900 DEG C, hot rolling reduction ratio≤10%, hot rolling
The thickness of rear steel band is 0.9-5.0mm；
4) cooling down hot rolled strip, cooldown rate is 10-50 DEG C/s；
5) batching hot rolled strip, coiling temperature is 630-730 DEG C；Hot-rolled strip microscopic structure by
More than 80% pearlite, and polygonal ferrite and acicular ferrite are constituted on a small quantity, and pearl
In body of light, cemetite lamellae layer thickness is nanometer scale, and cemetite lamellae interlamellar spacing is nanometer or sub-micro
Rice magnitude；
6) carrying out cold rolling to hot rolled strip, cold rolling reduction ratio is 65-75%, and cold rolling rear thickness of strips is
0.3-1.2mm；
7) cold-rolled strip being carried out blue annealing, annealing temperature is 550-600 DEG C, and annealing time is
120-180s。
2. the high-strength tie of thin strap continuous casting economy of tensile strength >=1100MPa as claimed in claim 1,
It is characterized in that: the content range of C is 0.28-0.38%, by weight percentage.
3. the high-strength tie of thin strap continuous casting economy of tensile strength >=1100MPa as claimed in claim 1,
It is characterized in that: the content range of Mn is 1.5-1.8%, by weight percentage.
4. the high-strength tie of thin strap continuous casting economy of tensile strength >=1100MPa as claimed in claim 1,
It is characterized in that: the content range of Si is 0.25-0.35%, by weight percentage.
5. the high-strength tie of thin strap continuous casting economy of tensile strength >=1100MPa as claimed in claim 1,
It is characterized in that: the content range of Nb, V, Ti is 0.01-0.05%, with percentage by weight
Meter.
6. the thin strap continuous casting economy high-strength tie manufacture method of tensile strength >=1100MPa, including walking as follows
Rapid:
1) using twin-roll thin strip continuous casting cast thickness is the Cast Strip of 1.0-5.0mm, its chemical composition
Percentage by weight is: C 0.25-0.40%, Si 0.15-0.40%, Mn 1.3-2.0%, P≤
0.015%, S≤0.01%, N≤0.012%, additionally it contained microalloy element Nb, V,
In Ti, Mo at least one, Nb 0.01-0.06%, V 0.01-0.06%, Ti 0.01-0.06%,
Mo 0.10-0.25%, remaining is Fe and inevitable impurity；
2) cooling down Cast Strip, cooldown rate is 20-80 DEG C/s；
3) Cast Strip is carried out online hot rolling, finishing temperature >=900 DEG C, hot rolling reduction ratio≤10%, hot rolling
The thickness of rear steel band is 0.9-5.0mm；
4) cooling down hot rolled strip, cooldown rate is 10-50 DEG C/s；
5) batching hot rolled strip, coiling temperature is 630-730 DEG C；Hot-rolled strip microscopic structure by
More than 80% pearlite, and polygonal ferrite and acicular ferrite are constituted on a small quantity, and pearl
In body of light, cemetite lamellae layer thickness is nanometer scale, and cemetite lamellae interlamellar spacing is nanometer or sub-micro
Rice magnitude；
6) carrying out cold rolling to hot rolled strip, cold rolling reduction ratio is 65-75%, and cold rolling rear thickness of strips is
0.3-1.2mm；
7) cold-rolled strip being carried out blue annealing, annealing temperature is 550-600 DEG C, and annealing time is
120-180s；Microscopic structure after cold-rolled strip annealing, for the ferrite matrix of recovery annealing
Upper Dispersed precipitate cementite particle or the cementite stub of a diameter of nanometer scale, and
The a size of precipitate of nanometer scale；Steel band tensile strength >=1100MPa, elongation percentage >=12%.
7. the high-strength tie system of thin strap continuous casting economy of tensile strength >=1100MPa as claimed in claim 6
Make method, it is characterised in that: described step 1) in, the content range of C is 0.28-0.38%,
By weight percentage.
8. the high-strength tie system of thin strap continuous casting economy of tensile strength >=1100MPa as claimed in claim 6
Make method, it is characterised in that: described step 1) in, the content range of Mn is 1.5-1.8%,
By weight percentage.
9. the high-strength tie system of thin strap continuous casting economy of tensile strength >=1100MPa as claimed in claim 6
Make method, it is characterised in that: described step 1) in, the content range of Si is 0.25-0.35%,
By weight percentage.
10. the high-strength tie system of thin strap continuous casting economy of tensile strength >=1100MPa as claimed in claim 6
Make method, it is characterised in that: described step 1) in, the content range of Nb, V, Ti is
0.01-0.05%, by weight percentage.
The high-strength tie system of thin strap continuous casting economy of 11. tensile strength >=1100MPa as claimed in claim 6
Make method, it is characterised in that: described step 2) in, Cast Strip cooldown rate is 30-60 DEG C/s.
The high-strength tie system of thin strap continuous casting economy of 12. tensile strength >=1100MPa as claimed in claim 6
Make method, it is characterised in that: described step 3) in, hot rolling reduction ratio is 5-10%.
The high-strength tie system of thin strap continuous casting economy of 13. tensile strength >=1100MPa as claimed in claim 6
Make method, it is characterised in that: described step 4) in, hot-rolled strip cooldown rate is 10-40 DEG C/s.
The high-strength tie system of thin strap continuous casting economy of 14. tensile strength >=1100MPa as claimed in claim 6
Make method, it is characterised in that: described step 5) in, the tensile strength of hot-rolled strip is
680-730MPa, elongation percentage >=15%.
The high-strength tie system of thin strap continuous casting economy of 15. tensile strength >=1100MPa as claimed in claim 6
Make method, it is characterised in that: as required increase step 8) steel band is painted or is zinc-plated after
Continuous process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410035079.1A CN103774041B (en) | 2014-01-24 | 2014-01-24 | The high-strength tie of thin strap continuous casting economy of tensile strength >=1100MPa and manufacture method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410035079.1A CN103774041B (en) | 2014-01-24 | 2014-01-24 | The high-strength tie of thin strap continuous casting economy of tensile strength >=1100MPa and manufacture method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103774041A CN103774041A (en) | 2014-05-07 |
| CN103774041B true CN103774041B (en) | 2016-08-24 |
Family
ID=50566794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410035079.1A Active CN103774041B (en) | 2014-01-24 | 2014-01-24 | The high-strength tie of thin strap continuous casting economy of tensile strength >=1100MPa and manufacture method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103774041B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103757536B (en) * | 2014-01-24 | 2016-10-05 | 宝山钢铁股份有限公司 | The high-strength tie of thin strap continuous casting economy of tensile strength >=1100MPa and manufacture method thereof |
| US10618107B2 (en) | 2016-04-14 | 2020-04-14 | GM Global Technology Operations LLC | Variable thickness continuous casting for tailor rolling |
| CN106119722A (en) * | 2016-08-12 | 2016-11-16 | 山东钢铁股份有限公司 | Superelevation strong steel belt for packages hot rolling raw sheet and preparation method thereof |
| CN106566989B (en) * | 2016-11-01 | 2019-04-05 | 河钢股份有限公司承德分公司 | One kind broad hot strip of tool containing vanadium and its production method |
| CN109440010B (en) * | 2018-12-20 | 2021-08-13 | 唐山钢铁集团高强汽车板有限公司 | 1100 MPa-grade high-strength strapping steel and production method thereof |
| CN112522593B (en) * | 2019-09-19 | 2022-06-24 | 宝山钢铁股份有限公司 | Thin 30CrMo hot rolled steel plate/strip and production method thereof |
| CN116356125A (en) * | 2020-04-16 | 2023-06-30 | 江苏沙钢集团有限公司 | High-strength steel for seat slide rail and method based on thin strip casting and rolling production |
| CN115478203A (en) * | 2022-09-27 | 2022-12-16 | 张家港中美超薄带科技有限公司 | Method for producing hot-rolled thin strip steel based on thin strip casting and rolling and ultrahigh-strength part |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5825434A (en) * | 1981-08-10 | 1983-02-15 | Kawasaki Steel Corp | Manufacture of band material for high tension bundling |
| CN1270942C (en) * | 2003-01-30 | 2006-08-23 | 伊利诺斯工具公司 | Steel strapping |
| CN101805870A (en) * | 2009-02-17 | 2010-08-18 | 宝山钢铁股份有限公司 | High strength strapping steel with tensile strength over 1,100 MPa and manufacturing method thereof |
-
2014
- 2014-01-24 CN CN201410035079.1A patent/CN103774041B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5825434A (en) * | 1981-08-10 | 1983-02-15 | Kawasaki Steel Corp | Manufacture of band material for high tension bundling |
| CN1270942C (en) * | 2003-01-30 | 2006-08-23 | 伊利诺斯工具公司 | Steel strapping |
| CN101805870A (en) * | 2009-02-17 | 2010-08-18 | 宝山钢铁股份有限公司 | High strength strapping steel with tensile strength over 1,100 MPa and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103774041A (en) | 2014-05-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103774041B (en) | The high-strength tie of thin strap continuous casting economy of tensile strength >=1100MPa and manufacture method thereof | |
| US9987669B2 (en) | Method for manufacturing thin strip continuously cast 700MPa-grade high strength weather-resistant steel | |
| CN102174683B (en) | Method for producing cold-rolling low-carbon aluminum killed steel with uniform through plate mechanical property | |
| CN102080192B (en) | Low-yield ratio, high-plasticity, ultrafine-grain and high-strength steel and manufacturing method thereof | |
| CN103305746B (en) | The high-strength steel band manufacture method of a kind of age hardening thin strap continuous casting low-carbon microalloy | |
| CN107177770A (en) | The production method of cold rolling low-alloy high-strength steel plate | |
| CN103757532B (en) | The high-strength tie of thin strap continuous casting economy of tensile strength >=980MPa and manufacture method thereof | |
| CN107419078A (en) | Yield strength 345MPa level low cost hot rolled steel plates and its manufacture method | |
| CN107557692B (en) | 1000MPa grade analysis of producing hot rolled TRIP and manufacturing method based on CSP process | |
| CN105177415A (en) | Ultrahigh-strength hot-rolled Q and P steel and production method thereof | |
| CN102277539A (en) | High-strength steel with low yield ratio, high plasticity and ultrafine grain and preparation method thereof | |
| CN107475627B (en) | 600MPa grade analysis of producing hot rolled TRIP and manufacturing method based on CSP process | |
| CN103757536B (en) | The high-strength tie of thin strap continuous casting economy of tensile strength >=1100MPa and manufacture method thereof | |
| CN106191682B (en) | A kind of easy-open end draw ring cold rolling hot-dip galvanized steel sheet and its production method | |
| CN103233161A (en) | Low-yield-ratio high-strength hot-rolled Q&P steel and manufacturing method thereof | |
| CN106566989B (en) | One kind broad hot strip of tool containing vanadium and its production method | |
| CN102581008A (en) | Processing method for producing low-cost high-formability IF (interstitial-free) steel | |
| CN106676392B (en) | Heat zinc coating plate and its production method | |
| CN112430787B (en) | Low-yield-ratio high-strength cold-rolled hot-dip galvanized steel plate and manufacturing method thereof | |
| CN107923013A (en) | High-strength steel sheet and its manufacture method | |
| CN109055651A (en) | A method of 600MPa grades of carriage body steel of hot rolling thin gauge are produced completely without head bar strip continuous casting and rolling flow path based on ESP | |
| CN103757530B (en) | The thin strap continuous casting economy ultra-high strength package binding band of tensile strength >=1250MPa and manufacture method thereof | |
| CN104451400B (en) | The TRIP-added high-strength steel of a kind of galvanizing by dipping and production method thereof | |
| CN103757533B (en) | The high-strength tie of thin strap continuous casting economy of tensile strength >=1000MPa and manufacture method thereof | |
| CN103757531B (en) | The high-strength tie of thin strap continuous casting economy of tensile strength >=1000MPa and manufacture method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |