CN106148846A - A kind of thick-specification high-tenacity X80 pipe fitting steel steel plate and manufacture method - Google Patents
A kind of thick-specification high-tenacity X80 pipe fitting steel steel plate and manufacture method Download PDFInfo
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- CN106148846A CN106148846A CN201610689676.5A CN201610689676A CN106148846A CN 106148846 A CN106148846 A CN 106148846A CN 201610689676 A CN201610689676 A CN 201610689676A CN 106148846 A CN106148846 A CN 106148846A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
Abstract
The invention discloses a kind of thick-specification high-tenacity X80 pipe fitting steel steel plate and manufacture method.Use low-carbon (LC) " Nb+Mo+V+Ni+Ti " polynary microalloy unique component design, ensure that think gauge X80 pipe fitting steel has excellent intensity surplus and high tenacity performance after heat treatment, utilize High Clean Steel Melts and the gradual flexible soft reduction technique of flawless continuous-casting billet, improve steel inclusion, make all kinds of inclusion behavior≤1.5 grade in steel, eliminate steel billet or even steel plate crack defect, improve the toughness properties of think gauge X80 pipe fitting steel plate by TMCP rolling and omnidistance system stress-removal technique, improve steel-plate shape, by high tempering Technology for Heating Processing, realize heat diffusion treatment, release internal stress and institutional framework and the toughness of improving plate centre line region；Solve the problems such as intensity surplus on the low side, toughness plasticity difference, welding performance plate bad, whole performance uniformity difference, deformed steel strip after X80 rank pipe fitting steel plate hot is processed.
Description
Technical field
The present invention relates to low-alloy high-strength pipe line steel manufacturing technology field, particularly relate to a kind of thick-specification high-tenacity
X80 pipe fitting steel steel plate and manufacture method.
Background technology
It with developing rapidly of domestic and international pipe-line, is also required to build substantial amounts of calming the anger in pipe-laying process
Stand, transmission & distribution station yard, valve chamber, pipe cap and isometrical reduced three-way pipe fitting.Pipeline pipe fitting in conveyance conduit, one can be according to need
The direction of pipeline to be changed；Two can be attached with stratum migration, earthquake and the external environment change etc. of region, buffering pipe place
Be added on straight tube draw, compression and moment of torsion effect, be that pipeline carries more harsh important component.Owing to pipe fitting steel makes
Complicated by middle stress, and technology difficulty is big in bending heat treatment process, furthermore with pipeline constantly to permafrost or
Seismic region extends, and also (includes the side such as mechanical property and dimension limit deviation to pipe fitting steel plate, the manufacture of steel pipe and quality thereof
Face) have higher requirement, directly influence safe and reliable property and the economic benefit of investment of pipe-line.A lot of works
Cheng Suoxu pipe fitting need exposed temperature less than at-46 DEG C, even up to less than-50 DEG C, pipe fitting thickness reaches more than 50mm,
This is one and stern challenge to strong fragility and the ultralow-temperature flexibility of pipe line steel material.At present, due to pipe fitting steel particularly
High-grade pipe line hardness of steel strength retrogression's effect after heat treatment is strong, needs higher carbon equivalent, and alloy is high, think gauge pipe line steel
Smelting and rolling cooling procedure is difficult to penetrate into steel plate heart portion, therefore, it is difficult to ensure Hi-grade steel pipe fitting steel low-temperature flexibility
Can, particularly pipe fitting steel welding seam toughness performance.Therefore the pipe fitting steel in the urgent need to intensity and toughness under environment of extremely trembling with fear are had both
Study and produce.
The patent of invention more close with the present invention has: 1) Chinese patent, Application Number (patent):
CN201310736900.8, a kind of novel low-cost Wear-resisting pipe fitting steel X65 steel plate；2) Chinese patent, Application Number (patent):
201110042499.9, the preparation method of a kind of X70 steel-grade bent and pipe fitting；3) Chinese patent, Application Number (patent):
CN201010199050.9, the preparation method of a kind of X80 bend pipe and steel for pipe fittings；4) Chinese patent, Application Number (patent):
CN201110043719.X, the preparation method of a kind of X90 steel-grade bent pipes and pipe fitting；5) Chinese patent, Application Number (patent):
CN201110043324.X, the preparation method of a kind of X100 steel-grade bent and pipe fitting.
Patent documents above all refer at different levels don't bother about part steel plate.For 1) in the design of the product composition announced, do not add
Add Cu element, requirement is not made to welding Sensitivity Index Pcm and Ceq key index, only relate to produce the pipe fitting of 16-25mm
With steel X65 steel, it is difficult to ensure that the welding performance of steel plate and low-temperature flexibility performance；2) 3) 4) 5) relate generally to X70, X80, X90,
X100 pipe fitting steel composition design in C(>=0.1%) use in carbon component design, it is difficult to ensure that the low-temperature flexibility of pipe fitting steel plate and
Intensity, and relate generally to composition design, rolling mill practice, pipe rolling technique and the Post isothermal treatment technique of pipe fitting steel plate, without tool
The technique that the release steel plate internal stress of smelting process and system that body relates to high tenacity pipe fitting steel improves pipe fitting steel plate low-temperature flexibility.
Content of the invention
The purpose of the present invention is aiming at the defect of above-mentioned existence and provides a kind of thick-specification high-tenacity X80 pipe fitting steel steel plate
And manufacture method, for meeting wanting of the performance indications such as X80 pipe fitting hardness of steel, low-temperature flexibility, weldability, elongation percentage and yield tensile ratio
Asking, with its high-performance as target, at the beginning of production technology and composition design, just careful in detail formulation, uses these technology to carry
For safe and reliable system, the engineer applied of Simultaneous Stabilization production and safety, solve high-strength pipe fitting steel based on this design and exist
The practical problem of application in engineering conveying.The X80 pipe fitting steel plate property using the present invention to produce is stable, particularly has excellent
Different low-temperature flexibility.
A kind of thick-specification high-tenacity X80 pipe fitting steel steel plate of the present invention and manufacture method technical scheme be, a kind of think gauge
High tenacity X80 pipe fitting steel steel plate, chemical composition is by weight percentage: C:0.05 ~ 0.08%, Si:0.20 ~ 0.30%, Mn:1.65
~ 1.85%, P≤0.01%, S≤0.005%, Nb:0.025 ~ 0.070%, Mo:0.18 ~ 0.25%, Nb+V+Ti≤0.15%, Cu:
0.10 ~ 0.20%:Cr:0.15 ~ 0.25%, Ni:0.15 ~ 0.30%, V:0.02 ~ 0.05%, Pcm=C+Si/30+ (Mn+Cu+Cr)/20
+ Ni/60+Mo/15+V/10+5B=0.16-0.23%, Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15=0.41-0.53%,
Remaining composition is Fe and inevitable impurity.
The preparation method of described a kind of thick-specification high-tenacity X80 pipe fitting steel steel plate, processing step includes successively:
By composition proportion get the raw materials ready-molten iron KR desulfurization processes-BOF-CAS Argon-LF+RH-CCM-continuous casting billet and rolls off the production line slow cooling 48 hours
Above-surface inspection, cleaning-roller phase coupling preparation-slab reheating-roughing-water under high pressure cooling-finish rolling-pre-straightening-ACC mould
Formula section cooling-aligning-stacking slow cooling-ultrasonic examination.
BOF is particularly as follows: according to the thick-specification high-tenacity X80 pipe fitting steel of corresponding chemical composition proportion when BOF, use high-quality
The scrap smeltings such as edges of boards, useless base, TSC(i.e. make steel thermometric in converting process, determine carbon) measure and terminate after, rifle is drawn be down to draw rapidly
Carbon rifle position, it is ensured that low rifle bit time 1-2min, reduces FeO content in slag；The tapping time at 6min, tapping hole must not diffusing, subtract
Inhaling nitrogen less, converter terminal temperature controls at >=1660 DEG C, and alloy addition sequence is in strict accordance with aluminium block-aluminium ferromanganese-manganese metal-silicon
Iron-ferrochrome-ferro-niobium-vanadium iron is carried out, and molybdenum-iron, nickel plate, copper coin add together with steel scrap.
During CAS Argon, aluminum steel feeding speed is at 0.5-0.8m/t, and CAS stands argon blowing time 15min, CAS terminal composition P
≤ 0.01%, S≤0.005%, 0.020%≤Alt≤0.060%.
Wrapping the first furnace temperature temperature in LF district and controlling at 1625-1660 DEG C, after the second stove, molten steel out-station temperature controls
1620-1650 DEG C, vacuum tank thermocouple temperature measurement point temperature >=1000 DEG C, RH district, vacuum ＜ 1000Pa, when processing under vacuum
Between 20min, pure degassing time 10min；Calcium iron wire feed quantity 1.8m/t, wire-feeding velocity 240m/min, guarantee [Ca] after Calcium treatment=
10-25ppm, after line feeding, little argon flow amount is blown into and ensures soft argon blowing time 16min.
During described CCM, using the dynamic gradual flexible soft reduction technique of continuous casting billet, Soft reduction rate is
0.80mm/min, drafts is gradual increase, minimum drafts 2mm, measures 6mm, reduction ratio 1.6mm/m, pressure under maximal pressure
Interval 0.5 ＜ FSC ＜ 0.9, strand constant pulling rate 0.85m/min, carry out weak water-cooled in two cold-zones, and nozzle total Water is 2.5L/
min。
In described roller phase coupling preparatory process, Finish Mill Roll Changing, roll other steel plates of similar width specification after roll change
35-40 props up, and treats heat in advance, it is ensured that transition blank and X80 continuous rolling.
Slab reheats in operation, after continuous casting billet heated stove soaking is come out of the stove, carries out 1 road water under high pressure dephosphorization, removes casting
Base scale on surface, after dephosphorization, casting blank surface temperature controls at 1080 DEG C ~ 1110 DEG C.
In described roughing, finish rolling and ACC mode section cooling and aligning operation, continuous casting billet milling selects horizontal stroke-axial rolling
Molding formula, rough rolling step steel plate biting speed 1.5m/s, mill speed 3.0m/s, roll 8 passages；Finishing mill rolls 13 passages,
Open rolling before machine, finish to gauge surface temperature control is at 800 DEG C, and section cooling opens cold temperature 780 ± 10 DEG C, surface of steel plate target cold temperature eventually
Spend 350 DEG C, use three passage aligning modes after cooling, strengthen drafts by passage.
Original thickness of strand is 250mm.
The invention have the benefit that the effect of each element in present component design is as follows:
C: carbon is that improving intensity main is also element the most cheap, and with the increase of carbon content, the intensity of steel increases, but simultaneously
The welding performance of steel plate and plasticity and toughness are deteriorated, and therefore the present invention selects low carbon component to design so that steel plate have good mould tough
Property and excellent welding performance.
Mn: manganese is the effective element improving intensity and toughness, and it is weak carbide former, its effect in smelting
Be deoxidation and the impact eliminating sulphur, can also reduce austenite transformation temperature, fining ferrite grains, to improve armor plate strength and
Toughness is beneficial.Simultaneously can also solution strengthening ferrite and the quenching degree increasing steel.Under the conditions of low-carbon (LC), bainite transformation is had by it
Significant facilitation.But during Mn too high levels, then hardening of steel and ductility degenerates.Mn is obvious because of its effect, with low cost
Quality plate becomes one of main addition element in producing.
Si: silicon plays the effect of deoxidier, has solution strengthening effect simultaneously, can also delay the shape of carbide greatly
Become, growing up of delayed cementite, add stabilization of austenite.But Si content is high, and field trash easily occurs in steel grade, and steel are easily given birth to
Rust, during hot rolling produces, iron rust is easily rolled into steel plate top layer, and galvanizing poor performance, when Si demonstrates and welds multithreading simultaneously
Local brittle zones has harmfulness.
The precipitation strength of Cu: copper is to improve the important means of intensity of steel, additionally, Cu is to the corrosion resistance of steel, improvement
Weldability, low-temperature flexibility, mouldability are all highly profitable with machinability etc..But on the other hand, continuous casting steel during Cu content height
It is easily generated crackle when base heating or hot rolling, deteriorate surface of steel plate performance, it is necessary to add according to the difference of intensity rank and steel plate thickness
Add appropriate Ni to stop the generation of this crackle.
Ni: nickel does not has harmful effect to welding heat affected zone hardening and toughness, the intensity of mother metal can be made again to improve, and make
Low-temperature flexibility is greatly improved.But it is compared with noble element, causes the cost of steel significantly to rise, less economical.Steel adds
The purpose of Ni element is mainly the tendency stoping the steel billet that the amount containing Cu is high to crack when heating or hot rolling.
Ti: add the titanium of trace, be to fix the nitrogen element in steel.Other Ti has strong precipitation strength effect, can
With improve steel intensity, the influence that the hardness at welding heat affected zone has also been had in the best condition, the nitride of Ti
The existence of particle can suppress the grain coarsening of welding heat affected zone to stop the length of steel billet crystal grain in heating, rolling, welding process
Greatly, the toughness of mother metal and welding heat affected zone is improved.When Ti is less than 0.005%, Gu N effect difference, during more than 0.03%, Gu N effect
Reaching saturated, superfluous Ti individually or form carbonitride together with Nb can strengthen steel, but the analysis of formation bulk sometimes
Go out phase, it will make the toughness of steel deteriorate.When the ratio of Ti, N atom in steel is 1:1, TiN particle is the most tiny and is distributed more
Dissipate, the strongest to the refining effect of high temperature austenite crystal grain, not only can obtain excellent toughness, and be capable of 30KJ/cm with
On Large Heat Input Welding.But, too much Ti content can cause the roughening of the nitride of titanium, unfavorable to low-temperature flexibility.
The interpolation of Cr: chromium can reduce the transformation temperature of steel grade, thinning microstructure, effectively improves intensity, can also improve steel
Kind of non-oxidizability and high temperature corrosion-resisting performance etc., but Cr crosses and separates out thick at most, causes the embrittlement of steel, to welding performance not
Good, therefore Cr content is designed as≤0.30%.
The present invention is directed to produce many difficult problems of high-level X80 low-temperature high-toughness pipe fitting steel, in conjunction with on-the-spot production practices
And technological equipment, use the design of low-carbon (LC) " Nb+Mo+V+Ni+Ti " polynary microalloy unique component, play each characteristic of elements and mutually
Between synergy, it is ensured that think gauge X80 pipe fitting steel has excellent intensity surplus and high tenacity performance after heat treatment,
Utilize High Clean Steel Melts and the gradual flexible soft reduction technique of flawless continuous-casting billet, improve steel inclusion, make all kinds of in steel being mingled with
Thing rank≤1.5 grade, eliminate steel billet or even steel plate crack defect, improve thickness by TMCP rolling and omnidistance system stress-removal technique
The toughness properties of specification X80 pipe fitting steel plate, improves steel-plate shape, by high tempering Technology for Heating Processing, it is achieved heat diffusion treatment,
Release internal stress and institutional framework and the toughness of improving plate centre line region；Solve X80 rank pipe fitting steel plate hot process
The problems such as rear intensity surplus is on the low side, toughness plasticity difference, welding performance plate bad, whole performance uniformity difference, deformed steel strip.Achieve
Stable, the mass production of thick-specification high-tenacity X80 pipe fitting steel.For advancing the extensive of anti-thick-specification high-tenacity X80 pipe fitting steel
Industrialized production serves the effect of positive important.
The equal field practice of present invention process data obtains, and through the use test of user, technology implements the steel of rear tubular member steel
Matter is purer, performance particularly low-temperature flexibility performance is more excellent, and yield strength Rt0.5 is 580MPa～620MPa, tensile strength
Rm is 740MPa～780MPa, yield tensile ratio Rt0.5/Rm≤0.82 ,-20 DEG C of Charpy-V impact power >=310J, shearing area rate is
100%, elongation percentage A >=48%, grain size >=11 grade, banded structure≤2.0, nonmetal inclusion is all≤1.5.
Brief description:
Fig. 1 show the embodiment of the present invention 1 gained steel plate thickness surface structure photo；
Fig. 2 show structure photo at the embodiment of the present invention 1 gained steel plate thickness 1/4th；
Fig. 3 show the embodiment of the present invention 1 gained steel plate thickness center structure photo.
Detailed description of the invention:
In order to be more fully understood that the present invention, describe technical scheme in detail with instantiation below, but the present invention
It is not limited thereto.
Embodiment 1
The thick-specification high-tenacity X80 pipe fitting steel steel plate of the present embodiment is to be prepared from by the component of following mass percent: C:
0.08%, Si:0.30%, Mn:1.85%, P:0.0064%, S:0.0016%, Cr:0.25%, Ni:0.30%, Nb:0.070%, Mo:
The balance of Fe of 0.25%, Ti:0.013%, V:0.05%, Cu:0.20%, Pcm=0.23%, Ceq=0.53% and inevitably miscellaneous
Matter.
The preparation method of the thick-specification high-tenacity X80 pipe fitting steel steel plate of the present embodiment is as follows:
1) BOF operation: use the scrap smelting such as high-quality edges of boards, useless base, after TSC measurement terminates, rifle is drawn be down to catch carbon rifle rapidly
Position, it is ensured that low rifle bit time 1min；The tapping time, tapping hole was without diffusing, and converter terminal temperature controls at=1660 DEG C at 6min,
Alloy addition sequence: aluminium block-aluminium ferromanganese-manganese metal-ferrosilicon-ferrochrome-ferro-niobium-vanadium iron is carried out, molybdenum-iron, nickel plate, copper coin and steel scrap
Add together.
2 CAS operations: during CAS Argon, aluminum steel feeding speed is at 0.5m/t, CAS stands argon blowing time 15min, and CAS is eventually
Point composition P=0.005%, S≤0.001%, Alt=0.020%.
3) fining cell: wrap the first furnace temperature temperature in LF district and control at 1625 DEG C, RH district vacuum tank thermocouple temperature measurement point temperature
Spend=1000 DEG C, vacuum 999Pa, process time 20min, pure degassing time 10min under vacuum；Calcium iron wire feed quantity 1.8m/
T, wire-feeding velocity 240m/min, [Ca]=10ppm after Calcium treatment, little argon flow amount argon blowing time 16min after line feeding,
In 4 CCM operations: using the dynamic gradual flexible soft reduction technique of continuous casting billet, Soft reduction rate is 0.80mm/min, pressure
Amount is gradual increase, minimum drafts 2mm, measures 6mm, reduction ratio 1.6mm/m, pressure range FSC=0.51, casting under maximal pressure
Base constant pulling rate 0.85m/min, carries out weak water-cooled in two cold-zones, and nozzle total Water is 2.5L/min.
5), in roller phase coupling preparatory process: finishing mill rolls roll change before premise, other steel of similar width specification after roll change, are rolled
Plate 35, treats heat, transition blank and X80 continuous rolling in advance.
6 slabs reheat in operation: carry out 1 road water under high pressure dephosphorization, remove oxidized iron sheets on surface of casting blank, strand after dephosphorization
Surface temperature control is at 1080 DEG C.
In 7 roughing, finish rolling and ACC mode section cooling and aligning operation: continuous casting billet milling selects horizontal-vertical rolling mode,
Rough rolling step steel plate biting speed 1.5m/s, mill speed 3.0m/s, roll 8 passages；Finishing mill rolls 13 passages, opens before machine
Rolling, finish to gauge surface temperature control is at 800 DEG C, and section cooling opens cold temperature 770 DEG C, and surface of steel plate target final cooling temperature 350 DEG C is cold
But use three passage aligning modes afterwards, strengthen drafts by passage,
8) to the steel plate edge of the present embodiment, 1/4th, heart portion detect respectively, internal structure such as Figure of description Fig. 1-3
Shown in, testing result is as follows:
After testing, the main performance of this example is as follows: Rt0.5 is 620MPa, and tensile strength Rm is 780MPa, yield tensile ratio
Rt0.5/Rm=0.79 ,-20 DEG C of impact=330J, 332J and 328J, the section of shear is 100%, 100%, 100%, elongation percentage A50.8=
50%, grain size=12 grade, banded structure=1.0, A, B, C, D class thickness nonmetal inclusion is=0.5.
Embodiment 2
The thick-specification high-tenacity X80 pipe fitting steel steel plate of the present embodiment is to be prepared from by the component of following mass percent: C:
0.05%, Si:0.2%, Mn:1.65%, P:0.0084%, S:0.003%, Cr:0.15%, Ni:0.15%, Nb:0.025%, Mo:
The balance of Fe of 0.18%, Ti:0.013%, V:0.02%, Cu:0.10%, Pcm=0.17%, Ceq=0.41% and inevitably miscellaneous
Matter.
The preparation method of the thick-specification high-tenacity X80 pipe fitting steel steel plate of the present embodiment is as follows:
1) BOF operation: use the scrap smelting such as high-quality edges of boards, useless base, after TSC measurement terminates, rifle is drawn be down to catch carbon rifle rapidly
Position, it is ensured that low rifle bit time 2min；The tapping time, tapping hole was without diffusing, and converter terminal temperature controls at=1700 DEG C at 6min,
Alloy addition sequence: aluminium block-aluminium ferromanganese-manganese metal-ferrosilicon-ferrochrome-ferro-niobium-vanadium iron is carried out, molybdenum-iron, nickel plate, copper coin and steel scrap
Add together.
2 CAS operations: during CAS Argon, aluminum steel feeding speed is at 0.8m/t, CAS stands argon blowing time 15min, and CAS is eventually
Point composition P=0.008%, S≤0.003%, Alt=0.060%.
3) fining cell: wrap the first furnace temperature temperature in LF district and control at 1660 DEG C, RH district vacuum tank thermocouple temperature measurement point temperature
Spend=1100 DEG C, vacuum 950Pa, process time 20min, pure degassing time 10min under vacuum；Calcium iron wire feed quantity 1.8m/
T, wire-feeding velocity 240m/min, [Ca]=25ppm after Calcium treatment, little argon flow amount argon blowing time 16min after line feeding,
In 4 CCM operations: using the dynamic gradual flexible soft reduction technique of continuous casting billet, Soft reduction rate is 0.80mm/min, pressure
Amount is gradual increase, minimum drafts 2mm, measures 6mm, reduction ratio 1.6mm/m, pressure range FSC=0.89, casting under maximal pressure
Base constant pulling rate 0.85m/min, carries out weak water-cooled in two cold-zones, and nozzle total Water is 2.5L/min.
5), in roller phase coupling preparatory process: finishing mill rolls roll change before premise, other steel of similar width specification after roll change, are rolled
Plate 40, treats heat, transition blank and X80 continuous rolling in advance.
6 slabs reheat in operation: carry out 1 road water under high pressure dephosphorization, remove oxidized iron sheets on surface of casting blank, strand after dephosphorization
Surface temperature control is at 1110 DEG C.
In 7 roughing, finish rolling and ACC mode section cooling and aligning operation: continuous casting billet milling selects horizontal-vertical rolling mode,
Rough rolling step steel plate biting speed 1.5m/s, mill speed 3.0m/s, roll 8 passages；Finishing mill rolls 13 passages, opens before machine
Rolling, finish to gauge surface temperature control is at 800 DEG C, and section cooling opens cold temperature 790 DEG C, and surface of steel plate target final cooling temperature 350 DEG C is cold
But use three passage aligning modes afterwards, strengthen drafts by passage,
8) after testing, the main performance of this example is as follows: Rt0.5 is 580MPa, and tensile strength Rm is 740MPa, yield tensile ratio
Rt0.5/Rm=0.78 ,-20 DEG C of impact=320J, 325J and 328J, the section of shear is 100%, 100%, 100%, elongation percentage A=
48%, grain size=11 grade, banded structure=2.0, A, B, C, D class thickness nonmetal inclusion is=1.5.
Embodiment 3
The thick-specification high-tenacity X80 pipe fitting steel steel plate of the present embodiment is to be prepared from by the component of following mass percent: C:
0.065%, Si:0.25%, Mn:1.75%, P:0.0054%, S:0.002%, Cr:0.15%, Ni:0.26%, Nb:0.060%, Mo:
The balance of Fe of 0.20%, Ti:0.013%, V:0.04%, Cu:0.15%, Pcm=0.20%, Ceq=0.46% and inevitably miscellaneous
Matter.
The preparation method of the thick-specification high-tenacity X80 pipe fitting steel steel plate of the present embodiment is as follows:
1) BOF operation: use the scrap smelting such as high-quality edges of boards, useless base, after TSC measurement terminates, rifle is drawn be down to catch carbon rifle rapidly
Position, it is ensured that low rifle bit time 1.5min；The tapping time controls=1675 without diffusing, converter terminal temperature at 6min, tapping hole
DEG C, alloy addition sequence: aluminium block-aluminium ferromanganese-manganese metal-ferrosilicon-ferrochrome-ferro-niobium-vanadium iron is carried out, molybdenum-iron, nickel plate, copper coin and useless
Steel adds together.
2 CAS operations: during CAS Argon, aluminum steel feeding speed is at 0.6m/t, CAS stands argon blowing time 15min, and CAS is eventually
Point composition P=0.006%, S≤0.004%, Alt=0.030%.
3) fining cell: wrap the first furnace temperature temperature in LF district and control at 1650 DEG C, RH district vacuum tank thermocouple temperature measurement point temperature
Spend=1050 DEG C, vacuum 970Pa, process time 20min, pure degassing time 10min under vacuum；Calcium iron wire feed quantity 1.8m/
T, wire-feeding velocity 240m/min, [Ca]=25ppm after Calcium treatment, little argon flow amount argon blowing time 16min after line feeding,
In 4 CCM operations: using the dynamic gradual flexible soft reduction technique of continuous casting billet, Soft reduction rate is 0.80mm/min, pressure
Amount is gradual increase, minimum drafts 2mm, measures 6mm, reduction ratio 1.6mm/m, pressure range FSC=0.75, casting under maximal pressure
Base constant pulling rate 0.85m/min, carries out weak water-cooled in two cold-zones, and nozzle total Water is 2.5L/min.
5), in roller phase coupling preparatory process: finishing mill rolls roll change before premise, other steel of similar width specification after roll change, are rolled
Plate 40, treats heat, transition blank and X80 continuous rolling in advance.
6 slabs reheat in operation: carry out 1 road water under high pressure dephosphorization, remove oxidized iron sheets on surface of casting blank, strand after dephosphorization
Surface temperature control is at 1100 DEG C.
In 7 roughing, finish rolling and ACC mode section cooling and aligning operation: continuous casting billet milling selects horizontal-vertical rolling mode,
Rough rolling step steel plate biting speed 1.5m/s, mill speed 3.0m/s, roll 8 passages；Finishing mill rolls 13 passages, opens before machine
Rolling, finish to gauge surface temperature control is at 800 DEG C, and section cooling opens cold temperature 780 DEG C, and surface of steel plate target final cooling temperature 350 DEG C is cold
But use three passage aligning modes afterwards, strengthen drafts by passage,
8) after testing, the main performance of this example is as follows: Rt0.5 is 600MPa, and tensile strength Rm is 760MPa, yield tensile ratio
Rt0.5/Rm=0.79 ,-20 DEG C of impact=333J, 326J and 325J, the section of shear is 100%, 100%, 100%, elongation percentage A50.8=
49%, grain size=12 grade, banded structure=1.5, A, B, C, D class thickness nonmetal inclusion is=0.5.
Claims (10)
1. a thick-specification high-tenacity X80 pipe fitting steel steel plate, it is characterised in that chemical composition is by weight percentage: C:0.05 ~
0.08%, Si:0.20 ~ 0.30%, Mn:1.65 ~ 1.85%, P≤0.01%, S≤0.005%, Nb:0.025 ~ 0.070%, Mo:0.18 ~
0.25%, Nb+V+Ti≤0.15%, Cu:0.10 ~ 0.20%:Cr:0.15 ~ 0.25%, Ni:0.15 ~ 0.30%, V:0.02 ~ 0.05%,
Pcm=C+Si/30+(Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B=0.16-0.23%,Ceq=C+Mn/6+(Cr+Mo+
V)/5+ (Ni+Cu)/15=0.41-0.53%, remaining composition is Fe and inevitable impurity.
2. the preparation method of a kind of thick-specification high-tenacity X80 pipe fitting steel steel plate as claimed in claim 1, it is characterised in that work
Skill step includes successively:
By composition proportion get the raw materials ready-molten iron KR desulfurization processes-BOF-CAS Argon-LF+RH-CCM-continuous casting billet and rolls off the production line slow cooling 48 hours
Above-surface inspection, cleaning-roller phase coupling preparation-slab reheating-roughing-water under high pressure cooling-finish rolling-pre-straightening-ACC mould
Formula section cooling-aligning-stacking slow cooling-ultrasonic examination.
3. the manufacture method of a kind of thick-specification high-tenacity X80 pipe fitting steel steel plate according to claim 2, it is characterised in that
BOF particularly as follows: according to the thick-specification high-tenacity X80 pipe fitting steel of corresponding chemical composition proportion when BOF, uses high-quality edges of boards, useless
Rifle after TSC measurement terminates, is drawn rapidly and is down to catch carbon rifle position, it is ensured that low rifle bit time 1-2min by the scrap smeltings such as base, reduces slag
Middle FeO content；The tapping time at 6min, tapping hole must not diffusing, reduce and inhale nitrogen, converter terminal temperature controls at >=1660 DEG C,
Alloy addition sequence is carried out in strict accordance with aluminium block-aluminium ferromanganese-manganese metal-ferrosilicon-ferrochrome-ferro-niobium-vanadium iron, molybdenum-iron, nickel plate, copper coin
Add together with steel scrap.
4. the manufacture method of a kind of thick-specification high-tenacity X80 pipe fitting steel steel plate according to claim 2, it is characterised in that
During CAS Argon, aluminum steel feeding speed is at 0.5-0.8m/t, and CAS stands argon blowing time 15min, CAS terminal composition P≤0.01%,
S≤0.005%, 0.020%≤Alt≤0.060%.
5. the manufacture method of a kind of thick-specification high-tenacity X80 pipe fitting steel steel plate according to claim 2, it is characterised in that
Wrapping the first furnace temperature temperature in LF district and controlling at 1625-1660 DEG C, after the second stove, molten steel out-station temperature controls at 1620-1650
DEG C, vacuum tank thermocouple temperature measurement point temperature >=1000 DEG C, RH district, vacuum ＜ 1000Pa, process time 20min under vacuum, pure
Degassing time 10min；Calcium iron wire feed quantity 1.8m/t, wire-feeding velocity 240m/min, ensure [Ca]=10-25ppm after Calcium treatment,
After line feeding, little argon flow amount is blown into and ensures soft argon blowing time 16min.
6. the manufacture method of a kind of thick-specification high-tenacity X80 pipe fitting steel steel plate according to claim 2, it is characterised in that
During described CCM, using the dynamic gradual flexible soft reduction technique of continuous casting billet, Soft reduction rate is 0.80mm/min, pressure
Lower amount is gradual increase, minimum drafts 2mm, measures 6mm, reduction ratio 1.6mm/m, pressure range 0.5 ＜ FSC ＜ under maximal pressure
0.9, strand constant pulling rate 0.85m/min, carry out weak water-cooled in two cold-zones, and nozzle total Water is 2.5L/min.
7. the manufacture method of a kind of thick-specification high-tenacity X80 pipe fitting steel steel plate according to claim 2, it is characterised in that
In described roller phase coupling preparatory process, Finish Mill Roll Changing, roll similar width specification other steel plates 35-40 after roll change and prop up,
And treat heat in advance, it is ensured that transition blank and X80 continuous rolling.
8. the manufacture method of a kind of thick-specification high-tenacity X80 pipe fitting steel steel plate according to claim 2, it is characterised in that
Slab reheats in operation, after continuous casting billet heated stove soaking is come out of the stove, carries out 1 road water under high pressure dephosphorization, removes casting billet surface oxygen
Changing iron sheet, after dephosphorization, casting blank surface temperature controls at 1080 DEG C ~ 1110 DEG C.
9. the manufacture method of a kind of thick-specification high-tenacity X80 pipe fitting steel steel plate according to claim 2, it is characterised in that
In described roughing, finish rolling and ACC mode section cooling and aligning operation, continuous casting billet milling selects horizontal-vertical rolling mode, slightly
Roll stage steel plate biting speed 1.5m/s, mill speed 3.0m/s, roll 8 passages；Finishing mill rolling 13 passages, open rolling before machine,
Finish to gauge surface temperature control is at 800 DEG C, and section cooling opens cold temperature 780 ± 10 DEG C, surface of steel plate target final cooling temperature 350 DEG C,
Use three passage aligning modes after cooling, strengthen drafts by passage.
10. the manufacture method of a kind of thick-specification high-tenacity X80 pipe fitting steel steel plate according to claim 2, it is characterised in that
Original thickness of strand is 250mm.
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| CN107604249A (en) * | 2017-08-11 | 2018-01-19 | 江阴兴澄特种钢铁有限公司 | A kind of economical hic resistance and anti-SSCCX80MS pipe line steels and its manufacture method |
| CN108411197A (en) * | 2018-03-27 | 2018-08-17 | 宝钢湛江钢铁有限公司 | A kind of effective think gauge X80 hot rolled coils of Φ 1422mm super large caliber spiral submerged arc weldeds and its manufacturing method |
| CN108704951A (en) * | 2018-05-10 | 2018-10-26 | 舞阳钢铁有限责任公司 | A kind of production method of large-scale steel ingot rolling super thick ultra-wide steel plate |
| CN109550915A (en) * | 2017-09-25 | 2019-04-02 | 上海梅山钢铁股份有限公司 | A method of control fine steel center segregation of continuous cast slab and loose |
| CN109663818A (en) * | 2018-11-19 | 2019-04-23 | 包头钢铁（集团）有限责任公司 | A kind of method that elimination steel plate rolling cracks in the process |
| CN110791702A (en) * | 2019-09-29 | 2020-02-14 | 鞍钢股份有限公司 | Marine steel plate with good welding performance and low yield ratio and manufacturing method thereof |
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| CN114875312A (en) * | 2022-04-26 | 2022-08-09 | 湖南华菱湘潭钢铁有限公司 | Production method of 485MPa tee pipe fitting steel |
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| CN112126865A (en) * | 2020-09-25 | 2020-12-25 | 湖南华菱湘潭钢铁有限公司 | Rolling method of X80 pipeline steel plate |
| CN114875312A (en) * | 2022-04-26 | 2022-08-09 | 湖南华菱湘潭钢铁有限公司 | Production method of 485MPa tee pipe fitting steel |
| CN116752045A (en) * | 2023-06-27 | 2023-09-15 | 湖南华菱湘潭钢铁有限公司 | Production method of thick-wall longitudinal submerged arc welded pipe X80Q |
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