CN104561486B - Thick-gauge hot continuous rolling steel belt with excellent ultralow temperature CTOD (Crack Tip Opening Displacement) performance and production method of thick-gauge hot continuous rolling steel belt - Google Patents
Thick-gauge hot continuous rolling steel belt with excellent ultralow temperature CTOD (Crack Tip Opening Displacement) performance and production method of thick-gauge hot continuous rolling steel belt Download PDFInfo
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Abstract
The invention relates to the technical field of hot continuous rolling steel belts for use in submarine oil/gas transmission pipelines and provides a thick-gauge hot continuous rolling steel belt with excellent ultralow temperature CTOD (Crack Tip Opening Displacement) performance and a production method of the thick-gauge hot continuous rolling steel belt. According to the thick-gauge hot continuous rolling steel belt and the production method, the technical problem of high technical difficulty in the production of the thick-gauge hot continuous rolling steel belt with the excellent ultralow temperature CTOD performance in the prior art is solved. The production method comprises the following steps: (1) continuously casting a plate blank into a casting blank with the thickness of 230mm-240mm by virtue of 'complete pretreatment' smelting and LF refining; (2) carrying out offline detection on the casting blank; (3) putting the casting blank in a heating furnace, and heating, wherein the heating temperature is 1190-1230 DEG C, and the temperature equalizing time is more than or equal to 30 minutes; (4) carrying out a rough rolling process; (5) carrying out a precision rolling process, wherein the thickness of the rolled steel belt is 16mm-20.2mm; (6) carrying out a laminar flow cooling process; and (7) reeling at the temperature of 480-560 DEG C. The production method can be used for producing the thick-gauge hot continuous rolling steel belt with the excellent ultralow temperature CTOD at relatively low difficulties.
Description
Technical field
The present invention relates to the technical field of submarine oil-transportation/gas pipeline hot continuous rolling steel band, particularly relate to one and have
The production method of the think gauge hot continuous rolling steel band of excellent ultralow temperature CTOD performance.
Background technology
Over nearly 10 years, more than the 50% of the newly-increased oil production rate of China is from ocean, and offshore and gas development is in weight
Point field, the demand of Submarine pipeline steel is the most increasing.Owing to using environment harsh, Submarine pipeline steel
Stricter than the requirement of general buried gas transmission line steel, except general execution DNV (DET NORSKE
VERITAS: Norske Veritas) outside standard, design Fang Junhui proposes harsher requirement and ensures safety
Property.As, Submarine pipeline steel requires higher solderability, it is desirable to relatively low-carbon-equivalent, and X65 rank requires carbon
Equivalent CE≤0.39, user may require CE≤0.38, and the general X65 pipe line steel carbon equivalent upper limit is 0.43,
Actual product often requires that≤low-temperature impact toughness of-30 DEG C, and≤-15 DEG C of drop weight tearing performances, require higher simultaneously
Vertical, horizontal performance, low temperature CTOD (Crack Tip Opening Displacement: crack tip opening
Displacement) performance is the important evaluation index of Submarine pipeline steel, particularly think gauge product, splits for evaluation
Stricture of vagina crack arrest ability, this safety in utilization being directly connected to submerged pipeline and service life, generally,
ERW welding submerged pipeline CTOD requires it is 0 DEG C of value >=0.20mm, uses environment, Yong Huyou according to difference
Shi Yaoqiu-15 DEG C value >=0.30mm.The Submarine pipeline steel with good low temperature performance will be greatly improved Submarine Pipeline
The dependability of line and active time.
In general, deep-sea pipeline steel wall thickness requires relatively big, main employing cut deal steel plate；And hot continuous rolling
After roll bending can weld (ERW) or crosscutting one-tenth steel plate by high-frequency resistance welding (HFRW), submerged-arc welding is connected into pipe, for the degree of depth
The most shallower environments such as subsea, vertical, the flat and bend pipe in the pipeline of shallow sea all can use hot-rolled coil tubulation, heat
Roll roll bending and there is production efficiency height, control accuracy high.Although being all Submarine pipeline steel, but heat is even
The Physical Metallurgy process rolling (strip product) production and cut deal Plate Production has the biggest difference.It is heated
Equipment for continuously rolling limits, and the compression ratio of hot continuous rolling steel band is limited, treats that temperature space is little, hot continuous rolling strip product thickness
The biggest, Rolling Production and to batch difficulty the biggest, it is ensured that the difficulty of every ultralow temperature performance is the biggest, and low
Cost, the requirement of low-carbon-equivalent, difficult by further improving the production technology requiring cryogenic property steel band undoubtedly
Degree.Accordingly, it would be desirable to carry out alloy system, smelting and rolling mill practice design targetedly.
At present, for have superior low temperature CTOD performance submerged pipeline hot-rolled coil patent report relatively
Few.
The patent of publication number CN 101701315A provides " manufacture method of submerged pipeline steel pipe ", its feature
It is to use C:0.04-0.08%, Si≤0.25%, Mn≤1.65%, Nb+V+Ti≤0.15%, Ceq≤0.41
Hot-rolled coil raw material carry out ERW welding procedure tubulation, its patent only focuses on tube-making process, is not directed to heat
Have bigger in tandem rolling steel band production technology, low temperature CTOD performance and low-temperature impact toughness, with this patent
Difference.The patent of publication number CN 101082108A provides " a kind of steel plate for submerged pipeline and rolling
Scheme processed ", describe the production decision of a kind of submerged pipeline hot-rolled coil, its composition be C:0.030～0.075%,
Si:0.10～0.30%, Mn:1.40～1.60%, Cu :≤0.20%, Ni:0.10～0.25%, Mo:0.07～0.20%,
Nb:0.03～0.05%, V :≤0.060%, Ti:0.001～0.02%, Al:0.01～0.06%, Cr :≤0.20%,
But the thickness that this patent relates to hot-rolled sheet coil is only 6-14mm, and impact average temperature, only at-15 DEG C, is worth
168～336J, low temperature CTOD only relates to-5 DEG C, and value only shows more than 0.25mm, the thickness of the patented product
Scope and low-temperature impact toughness, CTOD value level of relative are relatively low, and add costly in its product
Ni, Cu alloying element, relatively costly, more harsh environment is still needed to enhance product performance, with this specially
Larger difference is had in profit.The patent of publication number CN 103451536A describes " a kind of low cost think gauge
Submerged pipeline steel plate and manufacture method thereof ", the chemical composition that steel plate comprises is: C:0.04～0.06%, Si:
0.15～0.20%, Mn:1.43～1.47%, P :≤0.008%, S :≤0.003%, Ni:0.10～
0.15%, Nb:0.030～0.040%, Ti:0.012～0.023%, Al:0.015～0.025%,
N :≤0.006%, Nb+V+Ti≤0.15%.It is cut deal product that this patent relates to product, and its intensity is at 470MPa
Hereinafter ,-30 ° of impact averages, at about 300J, do not describe the low temperature CTOD value of steel sheet product, with this specially
Larger difference is had in profit.Patent " a kind of raising submerged pipeline steel low temperature of publication number CN 103846277A
The production decision of arrest toughness " it is applicable to the production of submerged pipeline steel Wide and Thick Slab product, describe one and improve
Submerged pipeline steel thickness direction heart portion Charpy impact toughness, low temperature drop hammer toughness DWTT and crack tip opening
The method of displacement CTOD, this patent is not directed to composition design, and CTOD value test temperature is-15 DEG C, with
Larger difference is had in this patent.
Analyzed from above, prior art also exists and produces the think gauge heat of ultralow temperature CTOD performance even
The technical problem that the technical difficulty of strip rolling is higher, production cost is higher.
Summary of the invention
The present invention provides a kind of think gauge hot continuous rolling steel band with excellent ultralow temperature CTOD performance and production
Method, to solve to produce in prior art to have the think gauge hot continuous rolling steel band of excellent ultralow temperature CTOD performance
The higher technical problem of technical difficulty.
First aspect, the embodiment of the present invention provides a kind of think gauge heat with excellent ultralow temperature CTOD performance
The production method of tandem rolling steel band, comprises the following steps:
(1) strand that " complete three take off " smelting, LF refine, slab direct casting become thickness to be 230-240mm；
(2) described strand is carried out lower ray examination, if inspection of rolling off the production line described in Jing Guo shows that described strand is unsatisfactory for
Condition, carries out scafing to described strand；
(3) being heated by described strand loading heating furnace, wherein, heating-up temperature is 1190～1230 DEG C,
Equal temperature time >=30min；
(4) roughing technique, it is 1020～980 DEG C that last passes of described roughing technique starts temperature,
Last reduction in pass 19～22% described, workpiece thickness is 50～58mm；
(5) finish-rolling process, the inlet temperature of described finish-rolling process is 900～960 DEG C, finish rolling extreme trace time pressure
Amount controls 9～12%, and finishing temperature is 800～860 DEG C, and after rolling, the thickness of steel band is 16～20.2mm；
(6) laminar flow cooling technology；
(7) when coiling temperature is 480～560 DEG C, batch, and then obtain described hot continuous rolling steel band.
Optionally, described " complete three take off " smelting, LF refine, slab direct casting become thickness to be 230-240mm
Strand, specifically include following steps:
Molten iron carrying out de-S and the pretreatment of de-P, makes S content≤0.0050% in described molten iron, P contains
Amount≤0.015%；
Adding steel scrap and Mo-Fe alloy at described molten iron, described Mo-Fe alloy is used for adjusting in described molten iron
The content of Mo, adding amount of scrap steel accounts for the 8-10% of total molten steel amount；Described molten iron is blended into de-C converter carry out turning
Stove is smelted；
Carry out converter tapping, add Al-Fe alloy at tapping process with the steel stream of described molten steel and carry out described molten steel
Deoxidation operation；It is subsequently added Si-Fe alloy, low-carbon Mn-Fe alloy, low-carbon (LC) Cr-Fe alloy, to carry out
The first successive step of Si, Mn, Cr element；
Carry out LF stove refine；
Processed by continuous casting and be cast into the described strand that thickness is 230～240mm, in described casting processing procedure
In, the solidification end at described molten steel carries out dynamic soft-reduction.
Optionally, described in carry out LF stove refine, specifically include:
Heating makes molten steel to being suitable for pouring temperature, it is ensured that molten steel overheat 15-30 DEG C described in casting process；
Carry out de-S operation, make S content≤0.0030% in described molten steel；
Al-Fe, Si-Fe alloy, middle carbon Mn-Fe alloy, low-carbon (LC) Cr-Fe, Ti-Fe is added in described molten steel
Alloy and C powder, thus carry out the adjustment of Al, Si, Mn, Cr, Ti, C element；
By feeding Ca-Fe line in described molten steel, field trash is carried out degenerative treatments；
Be blown into, by the bottom blowing hole of ladle bottom, the argon that single channel flow is 50～150L/min, make described in be mingled with
Thing floats.
Optionally, the mass percent of the chemical composition of described hot continuous rolling steel band is: C:0.040-0.080wt%,
Si:0.05-0.20wt%, Mn:1.20-1.60wt%, P :≤0.015wt%；S :≤0.0030wt%, Nb:
≤ 0.060wt%, Cr :≤0.20wt%, Ti:0.010-0.025wt%, V :≤0.040wt%, Mo :≤0.15wt%,
Remaining is Fe and inevitable impurity.
Optionally, carbon equivalent ce≤0.38 of described hot continuous rolling steel band, welding cold cracking Sensitivity rate Pcm≤0.17.
Optionally, the transverse yield strength R of described hot continuous rolling steel bandt0.5>=510MPa, tensile strength
Rm>=610MPa, percentage elongation A50.8mm>=35% ,-35 DEG C of low-temperature impacts absorb merit average >=390J, and-15 DEG C are dropped hammer
Tear test DWTT average is 100% ,-15 DEG C of crack tip opening displacement CTOD average >=1.2mm,
-40 DEG C of CTOD average >=0.9mm.
Second aspect, the embodiment of the present invention provides a kind of think gauge heat with excellent ultralow temperature CTOD performance
Tandem rolling steel band, its feature functionality is, the tool that described hot continuous rolling steel band is introduced by any embodiment of the present invention
The production method having the think gauge hot continuous rolling steel band of excellent ultralow temperature CTOD performance is fabricated by.
Optionally, the mass percent of the chemical composition of described hot continuous rolling steel band is: C:0.040-0.080wt%,
Si:0.05-0.20wt%, Mn:1.20-1.60wt%, P :≤0.015wt%；S :≤0.0030wt%, Nb:
≤ 0.060wt%, Cr :≤0.20wt%, Ti:0.010-0.025wt%, V :≤0.040wt%, Mo :≤0.15wt%,
Remaining is Fe and inevitable impurity.
Optionally, carbon equivalent ce≤0.38 of described hot continuous rolling steel band, welding cold cracking Sensitivity rate Pcm≤0.17.
Optionally, the transverse yield strength R of described hot continuous rolling steel bandt0.5 >=510MPa, tensile strength
Rm>=610MPa, percentage elongation A50.8mm>=35% ,-35 DEG C of low-temperature impacts absorb merit average >=390J, and-15 DEG C are dropped hammer
Tear test DWTT average is 100% ,-15 DEG C of crack tip opening displacement CTOD average >=1.2mm,
-40 DEG C of CTOD average >=0.9mm.
The present invention has the beneficial effect that:
Due in embodiments of the present invention, it is provided that a kind of think gauge heat with excellent ultralow temperature CTOD performance
The production method of tandem rolling steel band, comprises the following steps: (1) " complete three take off " smelting, LF refine, slab are continuous
It is cast into the strand that thickness is 230-240mm, is wherein smelted by " complete three take off ", LF refine can be so that steel
Water obtains relatively high cleanliness, reduces the impurity contents such as S, P, and then makes S content≤0.0030% in strand,
P content≤0.015%, (2) carry out lower ray examination to strand, if showing that strand is unsatisfactory for bar through inspection of rolling off the production line
Part, carries out scafing, thus ensures that strand is loaded heating furnace and carries out by steel strip surface quality (3) strand
Heating, wherein, heating-up temperature is 1190～1230 DEG C, equal temperature time >=30min, so that each regional temperature of strand
Uniformly, it is ensured that the abundant solid solution of alloying element, undue and uneven the growing up of austenite is prevented again；(4) roughing
Technique, it is 1020～980 DEG C that last passes of roughing technique starts temperature, last reduction in pass
19～22%, the 3rd workpiece thickness is 50～58mm, thus ensures that austenite crystal passes through repeatedly static state and ties
The brilliant full and uniform refinement of behavior, ensures the fairly static recrystallization behavior under lower temperature simultaneously, suppresses with this
Growing up of recrystal grain, it is thus achieved that tiny austenite crystal；(5) finish-rolling process, the entrance of finish-rolling process
Temperature is 900～960 DEG C, and finish rolling end reduction in pass controls 9～12%, and finishing temperature is 800～860 DEG C,
After rolling, the thickness of steel band is 16～20.2mm, ensures sufficiently flatization of austenite crystal with this, leads to simultaneously
Cross finish rolling and obtain higher strain accumulation, it is ensured that the abundant refinement of phase-change organization, reduce effective particle size,
Ensure sufficiently flatization of austenite crystal with this, obtain higher strain accumulation by finish rolling simultaneously, it is ensured that
The abundant refinement of phase-change organization, reduces effective particle size；(6) laminar flow cooling technology；(7) batch
Temperature is the taking-up activities of 480～560 DEG C, to obtain the microscopic structure with acicular ferrite as target, thus makes
Obtain the think gauge submerged pipeline hot continuous rolling steel band of more than 16mm.So providing one and having excellent ultralow
The production method of the think gauge hot continuous rolling steel band of temperature CTOD performance, the method production difficulty is relatively low, Jin Erneng
Enough reduce production cost.
Accompanying drawing explanation
Fig. 1 is the think gauge hot continuous rolling steel band in the embodiment of the present invention with excellent ultralow temperature CTOD performance
The flow chart of production method；
Fig. 2 is the life that the embodiment of the present invention has the think gauge hot continuous rolling steel band of excellent ultralow temperature CTOD performance
The strand that in product method, " complete three take off " smelting, LF refine, slab direct casting become thickness to be 230-240mm
Flow chart；
Fig. 3 is the flow chart carrying out LF stove refine in the embodiment of the present invention.
Detailed description of the invention
The present invention provides a kind of think gauge hot continuous rolling steel band with excellent ultralow temperature CTOD performance and production
Method, to solve to produce in prior art to have the think gauge hot continuous rolling steel band of excellent ultralow temperature CTOD performance
The higher technical problem of technical difficulty.
Technical scheme in the embodiment of the present application is to solve above-mentioned technical problem, and general thought is as follows:
There is provided the production method of a kind of think gauge hot continuous rolling steel band with excellent ultralow temperature CTOD performance, bag
Include following steps: (1) " complete three take off " smelting, LF refine, slab direct casting become thickness to be 230-240mm
Strand, wherein smelted by " complete three take off ", LF refine can reduce so that molten steel obtains relatively high cleanliness
The impurity contents such as S, P, and then make S content≤0.0030% in strand, P content≤0.015%, (2)
Strand being carried out lower ray examination, if showing that strand is unsatisfactory for condition through inspection of rolling off the production line, strand being carried out flame
Cleaning, thus ensure that strand is loaded heating furnace and heats by steel strip surface quality (3), wherein, heating temperature
Degree is 1190～1230 DEG C, equal temperature time >=30min, so that each regional temperature of strand is uniform, it is ensured that alloying element
Fully solid solution, prevents again undue and uneven the growing up of austenite；(4) roughing technique, roughing technique is
It is 1020～980 DEG C that the rolling of rear a time starts temperature, last reduction in pass 19～22%, the 3rd intermediate blank
Thickness is 50～58mm, thus ensures that austenite crystal passes through the repeatedly full and uniform refinement of Static Recrystallization behavior,
Ensure the fairly static recrystallization behavior under lower temperature simultaneously, suppress growing up of recrystal grain with this, obtain
Obtain tiny austenite crystal；(5) finish-rolling process, the inlet temperature of finish-rolling process is 900～960 DEG C, finish rolling
End reduction in pass controls 9～12%, and finishing temperature is 800～860 DEG C, and after rolling, the thickness of steel band is
16～20.2mm, ensure sufficiently flatization of austenite crystal with this, obtain higher strain by finish rolling simultaneously
Accumulation, it is ensured that the abundant refinement of phase-change organization, reduces effective particle size, ensures austenite crystal with this
Sufficiently flatization, obtains higher strain accumulation by finish rolling simultaneously, it is ensured that the abundant refinement of phase-change organization,
Reduce effective particle size；(6) laminar flow cooling technology；(7) carrying out coiling temperature is 480～560 DEG C batch
Operation, to obtain the microscopic structure with acicular ferrite as target, thus prepares the think gauge of more than 16mm
Submerged pipeline hot continuous rolling steel band.To provide a kind of think gauge heat with excellent ultralow temperature CTOD performance to connect
The production method of strip rolling, the method production difficulty is relatively low, and then can reduce production cost.
In order to be better understood from technique scheme, below by accompanying drawing and specific embodiment to skill of the present invention
Art scheme is described in detail, it should be understood that the specific features in the embodiment of the present invention and embodiment is to this
The detailed description of inventive technique scheme rather than the restriction to technical solution of the present invention, in the feelings do not conflicted
Under condition, the technical characteristic in the embodiment of the present invention and embodiment can be mutually combined.
First aspect, the embodiment of the present invention provides a kind of think gauge heat with excellent ultralow temperature CTOD performance
The production method of tandem rolling steel band, refer to Fig. 1, comprises the following steps:
Step S101: " complete three take off " smelting, LF (Ladle Furnace: ladle refining furnace) refine, slab are continuous
It is cast into the strand that thickness is 230-240mm；
In above-mentioned steps, first carry out complete three and take off " smelt, then carry out LF refine, finally that slab is continuous
It is cast into the strand that thickness is 230-240mm.
Step S102: strand is carried out lower ray examination, if showing that strand is unsatisfactory for condition through inspection of rolling off the production line,
Strand is carried out scafing；
Wherein, lower ray examination mainly checks surface quality and the quality of edges of strand, if problematic, needs
Carry out scafing and chamfered, thus ensure that the surface quality of the hot-rolled sheet coil of final rolling is (as without sticking up
Skin, bubble) and quality of edges (without edge cracks, fine rule), because these all can affect later stage tubulation steel
The surface quality of pipe and welding.
Wherein, scafing, is to utilize the gas cutting of thermal-flame and molten removing to act on steel billet surface defect burning
Remove.It is to ensure that the important procedure of billet quality.
Steel band quality is can ensure that by above-mentioned steps.
Step S103: strand is loaded heating furnace and heats, wherein, heating-up temperature is 1190～1230 DEG C,
Equal temperature time >=30min, being wherein in cold conditions at strand is to be loaded into heating furnace to heat, and cold conditions refers to
After strand cools down completely, it is re-fed into heating furnace.
By the control of above-mentioned heating parameters, each regional temperature of strand can be made uniform, it is ensured that alloying element fills
Divide solid solution, prevent again undue and uneven the growing up of austenite.
Step S104: roughing technique, it is 1020～980 DEG C that last passes of roughing technique starts temperature,
Last reduction in pass 19～22%, workpiece thickness is 50～58mm.
Control by above-mentioned roughing parameter, it is ensured that austenite crystal passes through repeatedly Static Recrystallization behavior
Full and uniform refinement, ensures the fairly static recrystallization behavior under lower temperature simultaneously, suppresses recrystallization with this
Growing up of crystal grain, it is thus achieved that tiny austenite crystal.
Step S105: finish-rolling process, the inlet temperature of finish-rolling process is 900～960 DEG C, finish rolling extreme trace time pressure
Lower amount controls 9～12%, and finishing temperature is 800～860 DEG C, and after rolling, the thickness of steel band is 16～20.2mm；
Control by above-mentioned finish rolling parameter, it is ensured that sufficiently flatization of austenite crystal, passes through simultaneously
Finish rolling obtains higher strain accumulation, it is ensured that the abundant refinement of phase-change organization, reduces effective particle size, with
This ensures sufficiently flatization of austenite crystal, obtains higher strain accumulation by finish rolling, it is ensured that phase simultaneously
Become the abundant refinement of tissue, reduce effective particle size.
In specific implementation process, if the steel band that thickness specification to be obtained is 16～18mm, then finish rolling 7 road
Secondary；If thickness specification to be obtained is the steel band of more than 18mm, then finish rolling 6 passage.
Step S106: laminar flow cooling technology；
Step S107: when coiling temperature is 480～560 DEG C, batch, and then obtain hot continuous rolling steel band.
Under normal circumstances, can prepare, by such scheme, the think gauge seabed that thickness specification is more than 16mm
Pipeline hot continuous rolling steel band.
As further preferred embodiment, in step S101, " complete three take off " smelting, LF refine, slab are even
Continuous it is cast into the strand that thickness is 230-240mm, refer to Fig. 2, specifically include following steps:
Step S201: molten iron is carried out de-S and the pretreatment of de-P, makes S content≤0.0050% in molten iron,
P content≤0.015%；
Wherein it is possible to take off S by the de-S device of KR (Kanbara reactor), make molten steel S content≤
0.0050%；Utilize the independent converter laid to take off P and de-Si, make molten steel P content≤0.015%；
Step S202: adding steel scrap and Mo-Fe alloy at molten iron, Mo-Fe alloy is used for adjusting in molten iron
The content of Mo, adding amount of scrap steel accounts for the 8-10% of total molten steel amount；Molten iron is blended into de-C converter and carries out converter smelting
Refining；
Step S203: carry out converter tapping, adds Al-Fe alloy at tapping process with the steel stream of molten steel and carries out
The deoxidation operation of molten steel；It is subsequently added Si-Fe alloy, low-carbon Mn-Fe alloy, low-carbon (LC) Cr-Fe alloy, with
Carry out the first successive step of Si, Mn, Cr element；
Step S204: carry out LF stove refine；
Step S205: processed by continuous casting and be cast into the strand that thickness is 230～240mm, processed in casting
Cheng Zhong, the solidification end at molten steel carries out dynamic soft-reduction.
In specific implementation process, solidification end refers to molten steel by liquid to solid state crystallization process of setting, solidifying
Position before Gu,
As further preferred embodiment, step S205 carries out LF stove refine, refer to Fig. 3, tool
Body includes:
Step S301: heating makes molten steel to being suitable for pouring temperature, it is ensured that casting process molten steel overheat 15-30 DEG C；
Step S302: carry out de-S operation, make S content≤0.0030% in molten steel；
Wherein, mainly carry out de-S by the addition material such as synthetic slag, fluorite to operate.
Step S303: in molten steel add Al-Fe, Si-Fe alloy, middle carbon Mn-Fe alloy, low-carbon (LC) Cr-Fe,
Ti-Fe alloy and C powder, thus carry out the adjustment of Al, Si, Mn, Cr, Ti, C element；
Step S304: by feeding Ca-Fe line in molten steel, field trash is carried out degenerative treatments；
Step S305: by the bottom blowing hole of ladle bottom be blown into little tolerance argon (single channel flow 50～
150L/min), inclusion floating is made.
In such scheme, employing low cost, the composition design of low-carbon-equivalent produce one and have excellent super
The think gauge hot continuous rolling steel band of low temperature CTOD performance, the production method of invention is: " complete three take off " smelts, LF
The strand that refine, slab direct casting become thickness to be 230-240mm, so that molten steel obtains relatively high cleanliness,
Reduce the impurity contents such as S, P.Under strand, ray examination, cleaning ensure steel strip surface quality.Rolling is again
Heating-up temperature is 1190～1230 DEG C, equal temperature time >=30min, so that each regional temperature of strand is uniform, it is ensured that
The abundant solid solution of alloying element, prevents again undue and uneven the growing up of austenite；In hot continuous rolling, roughing divides 8 roads
Secondary rolling, controls last passes of roughing and starts temperature, 1020～980 DEG C, last reduction in pass
19～22%, it is ensured that austenite crystal passes through the repeatedly full and uniform refinement of Static Recrystallization behavior, ensures relatively simultaneously
Fairly static recrystallization behavior under low temperature, suppresses growing up of recrystal grain with this, it is thus achieved that tiny Austria
Family name's body crystal grain.Workpiece thickness controls 50～58mm, and entry temperature at finishing is 900～960 DEG C, and 16～18mm
Thickness specification, finish rolling 7 passage, more than 18mm specification, finish rolling 6 passage, finish rolling end reduction in pass controls
9～12%, finishing temperature is 800～860 DEG C, ensures sufficiently flatization of austenite crystal with this, leads to simultaneously
Cross finish rolling and obtain higher strain accumulation, it is ensured that the abundant refinement of phase-change organization, reduce effective particle size.
Steel band after rolling, uses laminar flow quickly to cool down, and coiling temperature is 480～560 DEG C, it is thus achieved that with acicular ferrite be
The microscopic structure of target, thus prepare the think gauge with excellent ultralow temperature CTOD performance of more than 16mm
Hot continuous rolling steel band.
As further preferred embodiment, the mass percent of the chemical composition of hot continuous rolling steel band is: C:
0.040-0.080wt%, Si:0.05-0.20wt%, Mn:1.20-1.60wt%, P :≤0.015wt%；S:
≤ 0.0030wt%, Nb :≤0.060wt%, Cr :≤0.20wt%, Ti:0.010-0.025wt%, V :≤0.040wt%,
Mo :≤0.15wt%, remaining is Fe and inevitable impurity.
In the submerged pipeline hot continuous rolling steel band that the present invention provides, each alloy element action is as follows:
C: intensified element most economical, most basic in steel, but C content increase by reduce steel toughness and can
Welding, for ensureing relatively low carbon equivalent level, improves low-temperature impact toughness and low temperature CTOD performance simultaneously.
Patent C addition of the present invention is 0.04-0.08wt%.
Si: improve the intensity of steel with solution strengthening form, but more Si content is unfavorable for the low-carbon-equivalent of steel
Controlling and welding performance, the most too high Si would potentially result in more serious scale on surface.This patent Si
Addition is 0.05-0.25wt%.
Mn: solution strengthening element, can be effectively ensured intensity, but Mn is too high will significantly improve carbon equivalent, with
Time produce segregation in the middle of serious, affect the cryogenic property of product.Patent Mn addition of the present invention is 1.20-1.60
Wt%.
P, S are objectionable impurities element, will increase material fragility, more apparent on low-temperature flexibility impact, therefore,
Its content is the lowest more good, this patent by complete three de-smelting, LF refinery practice, P :≤0.015wt%；S:
≤ 0.0030wt%.
Nb: thin brilliant effect is obvious, can significantly improve obdurability, add a certain amount of Nb microalloy and can suppress
The crystal grain of welding heat affected zone is grown up.Patent Nb addition of the present invention is Nb:0.020-0.060wt%.
Ti: microalloy element, it is mainly solid N that trace adds, and the most tiny precipitation rose in the high-temperature heating stage
And play a part to suppress austenite to grow up, the beneficially raising of low-temperature flexibility.Patent Ti addition of the present invention
It is 0.010～0.020wt%.
Mo, Cr: there is relatively strong molten strengthening effect, quenching degree can be effectively improved, strength-enhancing effect is obvious,
Mo can suppress ferrite transformation, reduces starting temperature of transformation, and especially under the conditions of hot continuous rolling, strain is accumulative relatively
Under conditions of height, Mo can effectively suppress the generation of high-temperature phase-change tissue, makes up hot continuous rolling cooling capacity not enough.
But too high Mo, Cr will be greatly improved carbon equivalent, do not reach the requirement less than 0.38, the most too high Cr pair
ERW welding there is also adverse effect, and the price of Mo own is higher, will improve material cost.The present invention is special
Profit Cr :≤0.25wt%, Mo :≤0.15wt%.
V: microalloy element, has about solid solution and precipitation strength, particularly the precipitation in ferrite, can have
Effect proof strength level, this patent V≤0.050wt%.
As further preferred embodiment, carbon equivalent ce≤0.38 of hot continuous rolling steel band, welding cold cracking is sensitive
Rate Pcm≤0.17.
As further preferred embodiment, the transverse yield strength R of hot continuous rolling steel bandt0.5>=510MPa, tension
Intensity Rm>=610MPa, percentage elongation A50.8mm>=35% ,-35 DEG C of low-temperature impacts absorption merit average >=390J ,-15 DEG C
DWTT DWTT average is 100% ,-15 DEG C of crack tip opening displacement CTOD average >=1.2mm,
-40 DEG C of CTOD average >=0.9mm.
The sea that the embodiment of the present invention is introduced will be introduced below with four instantiations (example 1 to example 4)
The production method of end pipeline hot rolled strip.
The thickness specification of the submerged pipeline hot continuous rolling steel band of example 1,2,3,4 be respectively 16.2mm, 17.3mm,
18mm、20.2mm；
Chemical composition such as table 1 institute of the submerged pipeline hot continuous rolling steel band of the present example 1,2,3,4 produced
Show.
As shown in table 1, for the chemical composition (wt%) of hot continuous rolling steel band example 1,2,3,4 of the present invention.
Table 1
As shown in table 2 to table 5, for every test of the submerged pipeline hot continuous rolling steel band of example 1,2,3,4
Result.
The tensile property of the submerged pipeline hot continuous rolling steel band of table 2 example 1,2,3,4.
Table 2
Table 3 represents low-temperature impact toughness and the low temperature of the submerged pipeline hot continuous rolling steel band of example 1,2,3,4
DWTT performance.
Table 3
Table 4 is serial low-temperature impact toughness and the series low temperature of the submerged pipeline hot continuous rolling steel band of example 4
DWTT performance.
Table 4
Table 5 is the series of CT OD performance of the submerged pipeline hot continuous rolling steel band of example 4.
Table 5
The submerged pipeline hot continuous rolling steel strip substrate tissue generated based on acicular ferrite, contain simultaneously a small amount of horse-
Constituent element tissue difficult to understand.EBSD (EBSD) analyzes and shows, CTOD cracks can spread region, crystal grain
Orientation differs greatly, and big angle grain boundary density is high.
Second aspect, based on same inventive concept, the embodiment of the present invention provides one to have excellent ultralow temperature
The think gauge hot continuous rolling steel band of CTOD performance, hot continuous rolling steel band is introduced based on any embodiment of the present invention
The production method of submerged pipeline hot rolled strip is fabricated by.
Optionally, the mass percent of the chemical composition of submerged pipeline hot rolled strip is: C:
0.040-0.080wt%, Si:0.05-0.20wt%, Mn:1.20-1.60wt%, P :≤0.015wt%；S:
≤ 0.0030wt%, Nb :≤0.060wt%, Cr :≤0.20wt%, Ti:0.010-0.025wt%, V :≤0.040wt%,
Mo :≤0.15wt%, remaining is Fe and inevitable impurity.
Optionally, carbon equivalent ce≤0.38 of submerged pipeline hot rolled strip, welding cold cracking Sensitivity rate
Pcm≤0.17。
Optionally, the transverse yield strength R of hot continuous rolling steel bandt0.5 >=510MPa, tensile strength Rm>=610MPa,
Percentage elongation A50.8mm>=35% ,-35 DEG C of low-temperature impacts absorb merit average >=390J ,-15 DEG C of DWTTs
DWTT average is 100% ,-15 DEG C of crack tip opening displacement CTOD average >=1.2mm ,-40 DEG C of CTOD
Average >=0.9mm.
One or more embodiments of the invention, at least has the advantages that
There is provided the production method of a kind of think gauge hot continuous rolling steel band with excellent ultralow temperature CTOD performance, bag
Include following steps: (1) " complete three take off " smelting, LF refine, slab direct casting become thickness to be 230-240mm
Strand, wherein smelted by " complete three take off ", LF refine can reduce so that molten steel obtains relatively high cleanliness
The impurity contents such as S, P, and then make S content≤0.0030% in strand, P content≤0.015%, (2)
Strand being carried out lower ray examination, if showing that strand is unsatisfactory for condition through inspection of rolling off the production line, strand being carried out flame
Cleaning, thus ensure that strand is loaded heating furnace and heats by steel strip surface quality (3), wherein, heating temperature
Degree is 1190～1230 DEG C, equal temperature time >=30min, so that each regional temperature of strand is uniform, it is ensured that alloying element
Fully solid solution, prevents again undue and uneven the growing up of austenite；(4) roughing technique, roughing technique is
It is 1020～980 DEG C that the rolling of rear a time starts temperature, last reduction in pass 19～22%, the 3rd intermediate blank
Thickness is 50～58mm, thus ensures that austenite crystal passes through the repeatedly full and uniform refinement of Static Recrystallization behavior,
Ensure the fairly static recrystallization behavior under lower temperature simultaneously, suppress growing up of recrystal grain with this, obtain
Obtain tiny austenite crystal；(5) finish-rolling process, the inlet temperature of finish-rolling process is 900～960 DEG C, finish rolling
End reduction in pass controls 9～12%, and finishing temperature is 800～860 DEG C, and after rolling, the thickness of steel band is
16～20.2mm, ensure sufficiently flatization of austenite crystal with this, obtain higher strain by finish rolling simultaneously
Accumulation, it is ensured that the abundant refinement of phase-change organization, reduces effective particle size, ensures austenite crystal with this
Sufficiently flatization, obtains higher strain accumulation by finish rolling simultaneously, it is ensured that the abundant refinement of phase-change organization,
Reduce effective particle size；(6) laminar flow cooling technology；(7) carrying out coiling temperature is 480～560 DEG C batch
Operation, to obtain the microscopic structure with acicular ferrite as target, thus prepares the think gauge of more than 16mm
Submerged pipeline hot continuous rolling steel band.To provide a kind of think gauge heat with excellent ultralow temperature CTOD performance to connect
The production method of strip rolling, the method production difficulty is relatively low, and then can reduce production cost.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know base
This creativeness concept, then can make other change and amendment to these embodiments.So, appended right is wanted
Ask and be intended to be construed to include preferred embodiment and fall into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the embodiment of the present invention and not take off
Spirit and scope from the embodiment of the present invention.So, if these amendments of the embodiment of the present invention and modification belong to
Within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention be also intended to comprise these change and
Including modification.
Claims (8)
1. having a production method for the think gauge hot continuous rolling steel band of excellent ultralow temperature CTOD performance, it is special
Levy and be, comprise the following steps:
(1) complete three de-smeltings, ladle refining furnace LF refine, slab direct casting become thickness to be 230-240mm
Strand；
(2) described strand is carried out lower ray examination, if inspection of rolling off the production line described in Jing Guo shows that described strand is unsatisfactory for
Condition, carries out scafing to described strand；
(3) being heated by described strand loading heating furnace, wherein, heating-up temperature is 1190～1230 DEG C,
Equal temperature time >=30min；
(4) roughing technique, it is 1020～980 DEG C that last passes of described roughing technique starts temperature,
Last reduction in pass 19～22% described, workpiece thickness is 50～58mm；
(5) finish-rolling process, the inlet temperature of described finish-rolling process is 900～960 DEG C, finish rolling extreme trace time pressure
Amount controls 9～12%, and finishing temperature is 800～860 DEG C, and after rolling, the thickness of steel band is 16～20.2mm；
(6) laminar flow cooling technology；
(7) when coiling temperature is 480～560 DEG C, batch, and then obtain described hot continuous rolling steel band；
Wherein, the mass percent of the chemical composition of described hot continuous rolling steel band is: C:0.040-0.080wt%,
Si:0.05-0.20wt%, Mn:1.20-1.60wt%, P :≤0.015wt%；S :≤0.0030wt%, Nb:
≤ 0.060wt%, Cr :≤0.20wt%, Ti:0.010-0.025wt%, V :≤0.040wt%, Mo :≤0.15wt%,
Remaining is Fe and inevitable impurity.
2. the method for claim 1, it is characterised in that described " complete three take off " smelting, LF refine,
The strand that slab direct casting becomes thickness to be 230-240mm, specifically includes following steps:
Molten iron carrying out de-S and the pretreatment of de-P, makes S content≤0.0050% in described molten iron, P contains
Amount≤0.015%；
Adding steel scrap and Mo-Fe alloy at described molten iron, described Mo-Fe alloy is used for adjusting in described molten iron
The content of Mo, adding amount of scrap steel accounts for the 8-10% of total molten steel amount；Described molten iron is blended into de-C converter carry out turning
Stove is smelted；
Carry out converter tapping, add Al-Fe alloy at tapping process with the steel stream of described molten steel and carry out described molten steel
Deoxidation operation；It is subsequently added Si-Fe alloy, low-carbon Mn-Fe alloy, low-carbon (LC) Cr-Fe alloy, to carry out
The first successive step of Si, Mn, Cr element；
Carry out LF stove refine；
Processed by continuous casting and be cast into the described strand that thickness is 230～240mm, in described casting processing procedure
In, the solidification end at described molten steel carries out dynamic soft-reduction.
3. method as claimed in claim 2, it is characterised in that described in carry out LF stove refine, specifically wrap
Include:
Heating makes molten steel to being suitable for pouring temperature, it is ensured that molten steel overheat 15-30 DEG C described in casting process；
Carry out de-S operation, make S content≤0.0030% in described molten steel；
Al-Fe, Si-Fe alloy, middle carbon Mn-Fe alloy, low-carbon (LC) Cr-Fe, Ti-Fe is added in described molten steel
Alloy and C powder, thus carry out the adjustment of Al, Si, Mn, Cr, Ti, C element；
By feeding Ca-Fe line in described molten steel, field trash is carried out degenerative treatments；
Be blown into, by the bottom blowing hole of ladle bottom, the argon that single channel flow is 50～150L/min, make described in be mingled with
Thing floats.
4. the method as described in claim 1-3 is arbitrary, it is characterised in that the carbon of described hot continuous rolling steel band is worked as
Amount CE≤0.38, welding cold cracking Sensitivity rate Pcm≤0.17.
5. the method as described in claim 1-3 is arbitrary, it is characterised in that described hot continuous rolling steel band horizontal
Yield strength Rt0.5>=510MPa, tensile strength Rm>=610MPa, percentage elongation A50.8mm>=35% ,-35 DEG C low
Temperature impact absorbing energy average >=390J ,-15 DEG C of DWTT DWTT averages are 100% ,-15 DEG C of crackles
Tip opening displacement CTOD average >=1.2mm ,-40 DEG C of CTOD average >=0.9mm.
6. a think gauge hot continuous rolling steel band with excellent ultralow temperature CTOD performance, it is characterised in that institute
State hot continuous rolling steel band to be fabricated by based on the method described in the arbitrary claim of claim 1-3.
7. hot continuous rolling steel band as claimed in claim 6, it is characterised in that the carbon of described hot continuous rolling steel band is worked as
Amount CE≤0.38, welding cold cracking Sensitivity rate Pcm≤0.17.
8. hot continuous rolling steel band as claimed in claim 6, it is characterised in that described hot continuous rolling steel band horizontal
Yield strength Rt0.5 >=510MPa, tensile strength Rm>=610MPa, percentage elongation A50.8mm>=35% ,-35 DEG C low
Temperature impact absorbing energy average >=390J ,-15 DEG C of DWTT DWTT averages are 100% ,-15 DEG C of crackles
Tip opening displacement CTOD average >=1.2mm ,-40 DEG C of CTOD average >=0.9mm.
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| CN107604259A (en) * | 2017-08-31 | 2018-01-19 | 包头钢铁（集团）有限责任公司 | A kind of X70 line steel hot rollings coiled sheet and its production method |
| CN107829024A (en) * | 2017-10-16 | 2018-03-23 | 首钢京唐钢铁联合有限责任公司 | A kind of 700MPa levels above superhigh intensity weather-resistant steel plate and its hot continuous rolling process |
| CN110616300B (en) * | 2018-06-19 | 2021-02-19 | 宝山钢铁股份有限公司 | Low-temperature steel with excellent CTOD (carbon to steel) characteristics and manufacturing method thereof |
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| CN109182922A (en) * | 2018-10-30 | 2019-01-11 | 攀钢集团攀枝花钢铁研究院有限公司 | High tenacity ferrite type oil-gas pipeline hot continuous rolling steel band and its production method |
| CN110241360B (en) * | 2019-07-30 | 2020-11-03 | 马鞍山钢铁股份有限公司 | Hot rolled steel plate coil for thick-wall large-caliber ERW submarine pipeline and preparation method thereof |
| CN113278880A (en) * | 2021-04-15 | 2021-08-20 | 邯郸钢铁集团有限责任公司 | Low-yield-ratio and low-hardness submarine pipeline steel L485MO and production method thereof |
| CN115232938A (en) * | 2022-06-30 | 2022-10-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot rolled steel strip for 700 MPa-level high-strength engineering machinery and production method thereof |
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| JPS56156715A (en) * | 1980-05-07 | 1981-12-03 | Nippon Kokan Kk <Nkk> | Manufacture of ni-containing steel for low temperature excellent in crack tip opening displacement |
| CN101397626B (en) * | 2007-12-07 | 2012-04-11 | 江苏沙钢集团有限公司 | High intensity and high-toughness hot-rolled steel sheet and method for producing the same |
| CN100560771C (en) * | 2007-12-25 | 2009-11-18 | 莱芜钢铁集团有限公司 | High ductility steel strip for J 55 petroleum sleeve and manufacture method thereof |
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