CN106148846B - A kind of thick-specification high-tenacity X80 pipe fitting steel steel plates and manufacture method - Google Patents
A kind of thick-specification high-tenacity X80 pipe fitting steel steel plates and manufacture method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- 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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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- 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
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- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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Abstract
The invention discloses a kind of thick-specification high-tenacity X80 pipe fitting steel steel plates and manufacture method.Using the polynary microalloy unique component design of low-carbon " Nb+Mo+V+Ni+Ti ", ensure that think gauge X80 pipe fittings steel has excellent intensity surplus and high tenacity performance after heat treatment, utilize the gradual flexible soft reduction technique of High Clean Steel Melts and 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, the toughness properties that think gauge X80 pipe fitting steel plates are improved with whole system stress-removal technique are rolled by TMCP, improve steel-plate shape, by high tempering Technology for Heating Processing, realize heat diffusion treatment, discharge internal stress and improve the institutional framework and toughness in plate centre line region；Solve X80 rank pipe fittings steel plate heat treatment after intensity surplus is relatively low, toughness plasticity is poor, welding performance is bad, poor whole plate performance uniformity, deformed steel strip the problems such as.
Description
Technical field
The present invention relates to low-alloy high-strength pipe line steel manufacturing technology field, more particularly to a kind of thick-specification high-tenacity
X80 pipe fitting steel steel plates and manufacture method.
Background technology
With developing rapidly for domestic and international pipe-line, it is also required to build substantial amounts of calm 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
Change the direction of pipeline；Two can be attached with the stratum migration, earthquake and external environment change of region where buffering pipe etc.
Drawing on straight tube, compression and moment of torsion effect are added in, is to carry more harsh important component in pipeline.Because pipe fitting steel makes
It is complicated with middle stress, and technology difficulty is big in heat treatment process is bent, furthermore with pipeline constantly to permafrost or
Seismic region extends, also to pipe fitting steel plate, the manufacture of steel pipe and its quality (including the side such as mechanical property and dimension limit deviation
Face) higher requirement is proposed, directly influence the safe and reliable property and economic benefit of investment of pipe-line.Many works
Cheng Suoxu pipe fittings need it is exposed temperature be less than -46 DEG C at, even up to less than -50 DEG C, pipe fitting thickness reaches more than 50mm,
This strong fragility and ultralow-temperature flexibility to pipe line steel material is one and its stern challenge.At present, because pipe fitting steel is particularly
Strength retrogression's effect is strong, it is necessary to higher carbon equivalent, alloy is high after heat treatment for high-grade pipe line hardness of steel, think gauge pipe line steel
It is difficult to penetrate into steel plate center portion in smelting and rolling cooling procedure, therefore, it is difficult to ensure Hi-grade steel pipe fitting steel low-temperature flexibility
Energy, particularly pipe fitting steel welding seam toughness performance.Therefore in the urgent need to the pipe fitting steel that has both of intensity and toughness under environment of extremely trembling with fear
Studied and produced.
Have with the present invention more close patent of invention：1）Chinese patent, Application Number (patent):CN201310736900.8,
A kind of novel low-cost Wear-resisting pipe fitting steel X65 steel plates；2）Chinese patent, Application Number (patent):201110042499.9, it is a kind of
The preparation method of X70 steel-grade bents and pipe fitting；3）Chinese patent, Application Number (patent):CN201010199050.9, a kind of X80
The preparation method of bend pipe and steel for pipe fittings；4）Chinese patent, Application Number (patent):CN201110043719.X, a kind of X90 grade of steels
The preparation method of bend pipe and pipe fitting； 5）Chinese patent, Application Number (patent):CN201110043324.X, a kind of X100 grade of steels
The preparation method of bend pipe and pipe fitting.
Patent documents above all refers at different levels no matter part steel plate.For 1）In the product composition design of announcement, do not add
Plus Cu elements, requirement is not made to welding Sensitivity Index Pcm and Ceq key index, is simply related to production 16-25mm pipe fitting
With steel X65 steel, it is difficult to ensure that the welding performance and low-temperature flexibility performance of steel plate；2）3）4）5）Relate generally to X70, X80, X90,
C in the composition design of X100 pipe fitting steel（≥0.1%）In carbon component design, it is difficult to ensure that the low-temperature flexibility of pipe fitting steel plate and
Intensity, and composition design, rolling mill practice, pipe rolling technique and the Post isothermal treatment technique of pipe fitting steel plate are related generally to, without having
Body is related to the technique that the smelting process of high tenacity pipe fitting steel and the release steel plate internal stress of system improve pipe fitting steel plate low-temperature flexibility.
The content of the invention
The purpose of the present invention provides a kind of thick-specification high-tenacity X80 pipe fittings steel steel plate aiming at above-mentioned defect
And manufacture method, to meet wanting for the performance indications such as X80 pipe fittings hardness of steel, low-temperature flexibility, weldability, elongation percentage and yield tensile ratio
Ask, it is just careful in detail at the beginning of the production technology and composition design to formulate using its high-performance as target, it can be carried using these technologies
For safe and reliable system, the engineer applied of Simultaneous Stabilization production and safety solves high-strength pipe fitting steel based on this design and existed
The practical problem applied in engineering conveying.The X80 pipe fitting steel plate property produced using the present invention is stable, particularly with excellent
Different low-temperature flexibility.
The present invention a kind of thick-specification high-tenacity X80 pipe fitting steel steel plates and manufacture method technical scheme be, a kind of think gauge
High tenacity X80 pipe fitting steel steel plates, 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.
A kind of preparation method of described thick-specification high-tenacity X80 pipe fittings steel steel plate, processing step includes successively：
Got the raw materials ready-offline the slow cooling 48 of molten iron KR desulfurization process-BOF-CAS Argon-LF+RH-CCM- continuous casting billets by composition proportion
The hour above-surface inspection, cleaning-roller phase matching preparation-slab reheating-roughing-high pressure water cooling-finish rolling-pre-straightening-
ACC mode section cooling-aligning-stacking slow cooling-ultrasonic examination.
BOF is specially：According to the thick-specification high-tenacity X80 pipe fittings steel of corresponding chemical composition proportion in BOF, using high-quality
The scrap smeltings, TSC such as edges of boards, useless base（Make steel thermometric in converting process, determine carbon）After measurement terminates, rifle is drawn be down to drawing rapidly
Carbon rifle position, it is ensured that low rifle position time 1-2min, reduces FeO contents in slag；The tapping time in 6min, tapping hole must not diffusing, subtract
Nitrogen is inhaled less, and converter terminal temperature control is 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 and steel scrap are added together.
Aluminum steel feeding speed is in 0.5-0.8m/t, CAS stations argon blowing time 15min, CAS terminal composition P during CAS Argons
≤ 0.01%, S≤0.005%, 0.020%≤Alt≤0.060%.
The molten steel out-station temperature control after 1625-1660 DEG C, the second stove of the first furnace temperature temperature control is wrapped in LF areas to exist
1620-1650 DEG C, RH areas vacuum tank thermocouple temperature measurement point temperature >=1000 DEG C, vacuum ＜ 1000Pa, when handling under vacuum
Between 20min, pure degassing time 10min；Ensure after calcium iron wire feed quantity 1.8m/t, wire-feeding velocity 240m/min, Calcium treatment [Ca]=
10-25ppm, small argon flow amount is blown into and ensures soft argon blowing time 16min after line feeding.
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, highest drafts 6mm, reduction ratio 1.6mm/m, pressure
Interval 0.5 ＜ FSC ＜ 0.9, the constant pulling rate 0.85m/min of strand, weak water cooling is carried out in two cold-zones, and nozzle total Water is 2.5L/
min。
In described roller phase matching preparatory process, Finish Mill Roll Changing rolls the other steel plates of similar width specification after roll change
35-40 branch, and heat is treated in advance, it is ensured that transition blank and X80 continuous rollings.
In slab reheating operation, after the heated stove soaking of continuous casting billet is come out of the stove, 1 road water under high pressure dephosphorization is carried out, casting is removed
Casting blank surface temperature control is at 1080 DEG C ~ 1110 DEG C after base scale on surface, dephosphorization.
In described roughing, finish rolling and ACC mode section cooling and aligning process, continuous casting billet milling selection 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 780 ± 10 DEG C of temperature, surface of steel plate target cold temperature eventually
350 DEG C of degree, mode is aligned after cooling using three passages, and drafts is increased by passage.
Original thickness of strand is 250mm.
Beneficial effects of the present invention are：The effect of each element is as follows in present component design：
C：Carbon is that to improve intensity main be also most cheap element, with the increase of carbon content, the intensity increase of steel, but
The welding performance and plasticity and toughness of steel plate are deteriorated simultaneously, therefore the present invention selects low-carbon composition design so that steel plate has good
Plasticity and toughness and excellent welding performance.
Mn：Manganese is the effective element for improving intensity and toughness, and it is weak carbide formation element, its effect in smelting
Be deoxidation and eliminate the influence of 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 increase steel quenching degree.It has to bainite transformation under the conditions of low-carbon
Significant facilitation.But during Mn too high levels, then hardening of steel and ductility degenerates.Mn because its effect substantially, it is with low cost
Turn into one of main addition element in quality plate production.
Si：Silicon plays a part of deoxidier, while there is solution strengthening effect, can also greatly delay the shape of carbide
Into growing up for delayed cementite adds stabilization of austenite.But Si contents are high, easily there is field trash in steel grade, and steel are easily given birth to
Rust, iron rust is easily rolled into steel plate top layer, galvanizing poor performance in hot rolling production, while Si is shown when being welded to multithreading
Local brittle zones have harmfulness.
Cu：The precipitation strength of copper is the important means for the intensity for improving steel, in addition, Cu to the corrosion resistance of steel, improve
Weldability, low-temperature flexibility, mouldability and machinability etc. are all highly profitable.But on the other hand, continuous casting steel when Cu contents are high
Crackle is also easy to produce when base heating or hot rolling, deteriorates surface of steel plate performance, it is necessary to add according to the difference of intensity rank and steel plate thickness
Plus appropriate Ni is to prevent the generation of this crackle.
Ni：Nickel does not have harmful effect to welding heat affected zone hardening and toughness, the intensity of mother metal can again improved, and make
Low-temperature flexibility is greatly improved.But it is that the cost for causing steel compared with noble element significantly rises, less economical.Added in steel
The purpose of Ni elements is mainly the tendency that the high steel billet of the amount containing Cu of prevention is cracked in heating or hot rolling.
Ti：Micro titanium is added, is to fix the nitrogen in steel.Other Ti has strong precipitation strength effect, can
To improve the intensity of steel, the influence also having had to the hardness at welding heat affected zone in the best condition, Ti nitride
The presence of particle can suppress the length of grain coarsening prevention steel billet crystal grain in heating, rolling, welding process of welding heat affected zone
Greatly, the toughness of mother metal and welding heat affected zone is improved.When Ti is less than 0.005%, Gu N effects are poor, during more than 0.03%, Gu N effects
Saturation is reached, superfluous Ti can form carbonitride individually or together with Nb, strengthen steel, but form the analysis of bulk sometimes
Go out phase, it will deteriorate the toughness of steel.When the ratio between Ti, N atom in steel is 1：When 1, TiN particles are the most tiny and are distributed more
Dissipate, it is most strong to the refining effect of high temperature austenite crystal grain, can not only obtain excellent toughness, and can realize 30KJ/cm with
On Large Heat Input Welding.But, excessive Ti contents can cause the roughening of the nitride of titanium, unfavorable to low-temperature flexibility.
Cr：The addition of chromium can reduce the transformation temperature of steel grade, and thinning microstructure effectively improves intensity, can also improve steel
Kind of inoxidizability and high temperature corrosion-resisting performance etc., but Cr is crossed and is at most separated out thick, causes the embrittlement of steel, to welding performance not
It is good, therefore Cr contents are designed as≤0.30%.
The present invention is directed to many problems for producing high-level X80 low-temperature high-toughness pipe fitting steel, with reference to the production practices at scene
And technological equipment, designed using the polynary microalloy unique component of low-carbon " Nb+Mo+V+Ni+Ti ", play each element characteristic and mutual
Between synergy, it is ensured that think gauge X80 pipe fittings steel after heat treatment have excellent intensity surplus and high tenacity performance,
Using the gradual flexible soft reduction technique of High Clean Steel Melts and flawless continuous-casting billet, improve steel inclusion, make all kinds of in steel be mingled with
Thing rank≤1.5 grade, eliminate steel billet or even steel plate crack defect, improve thick by TMCP rollings and whole system stress-removal technique
The toughness properties of specification X80 pipe fitting steel plates, improve steel-plate shape, by high tempering Technology for Heating Processing, realize heat diffusion treatment,
Discharge internal stress and improve the institutional framework and toughness in plate centre line region；Solve the heat treatment of X80 rank pipe fittings steel plate
Intensity surplus is relatively low afterwards, toughness plasticity is poor, welding performance is bad, poor whole plate performance uniformity, deformed steel strip the problems such as.Realize
The stabilization of thick-specification high-tenacity X80 pipe fitting steel, mass production.To promote 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 is obtained, and is tested by the use 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 ≤1.5.
Brief description of the drawings：
Fig. 1 show structure photo at the gained steel plate thickness surface of the embodiment of the present invention 1；
Fig. 2 show structure photo at the gained steel plate thickness a quarter of the embodiment of the present invention 1；
Fig. 3 show the gained steel plate thickness center structure photo of the embodiment of the present invention 1.
Embodiment：
For a better understanding of the present invention, technical scheme is described in detail with instantiation below, but originally
Invention is not limited thereto.
Embodiment 1
The thick-specification high-tenacity X80 pipe fitting steel steel plates of the present embodiment are 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：
0.25%, Ti: 0.013%,V：0.05%, Cu：The surplus of 0.20%, Pcm=0.23%, Ceq=0.53% is Fe and inevitably miscellaneous
Matter.
The preparation method of the thick-specification high-tenacity X80 pipe fitting steel steel plates of the present embodiment is as follows：
1）BOF processes：Using scrap smeltings such as high-quality edges of boards, useless bases, after TSC measurements terminate, rifle is drawn be down to drawing rapidly
Carbon rifle position, it is ensured that low rifle position time 1min；The tapping time, tapping hole was without diffusing, and converter terminal temperature control is=1660 in 6min
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 is added together.
2 ﹚ CAS processes：Aluminum steel feeding speed is in 0.5m/t during CAS Argons, and CAS stations argon blowing time 15min, CAS are whole
Point composition P=0.005%, S≤0.001%, Alt=0.020%.
3）Fining cell：The first furnace temperature temperature control is wrapped in LF areas in 1625 DEG C, RH areas vacuum tank thermocouple temperature measurement point temperature
=1000 DEG C of degree, vacuum 999Pa, vacuum 20min of lower processing time, pure degassing time 10min；Calcium iron wire feed quantity 1.8m/
[Ca]=10ppm after t, wire-feeding velocity 240m/min, Calcium treatment, small argon flow amount argon blowing time 16min after line feeding,
In 4 ﹚ CCM processes：Using the dynamic gradual flexible soft reduction technique of continuous casting billet, Soft reduction rate is 0.80mm/min,
Drafts be gradual increase, minimum drafts 2mm, highest drafts 6mm, reduction ratio 1.6mm/m, pressure range FSC=
0.51, the constant pulling rate 0.85m/min of strand, weak water cooling is carried out in two cold-zones, and nozzle total Water is 2.5L/min.
5）In roller phase matching preparatory process：Roll change in advance before finishing mill rolls, rolls the other steel of similar width specification after roll change
Plate 35, treats heat, transition blank and X80 continuous rollings in advance.
In 6 ﹚ slab reheating operations：1 road water under high pressure dephosphorization is carried out, oxidized iron sheets on surface of casting blank, strand after dephosphorization is removed
Surface temperature control is at 1080 DEG C.
In 7 ﹚ roughing, finish rolling and ACC mode section cooling and aligning process：Horizontal-vertical rolling mode of continuous casting billet milling selection,
Rough rolling step steel plate biting speed 1.5m/s, mill speed 3.0m/s, roll 8 passages；Finishing mill is opened before rolling 13 passages, machine
Roll, finish to gauge surface temperature control is at 800 DEG C, and section cooling opens cold 770 DEG C of temperature, and 350 DEG C of surface of steel plate target final cooling temperature is cold
But mode is aligned using three passages afterwards, drafts is increased by passage,
8）Steel plate edge, a quarter portion to the present embodiment, center portion detect respectively, internal structure such as Figure of description figure
Shown in 1-3, 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 are=0.5.
Embodiment 2
The thick-specification high-tenacity X80 pipe fitting steel steel plates of the present embodiment are 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：
0.18%, Ti: 0.013%,V：0.02%, Cu：The surplus of 0.10%, Pcm=0.17%, Ceq=0.41% is Fe and inevitably miscellaneous
Matter.
The preparation method of the thick-specification high-tenacity X80 pipe fitting steel steel plates of the present embodiment is as follows：
1）BOF processes：Using scrap smeltings such as high-quality edges of boards, useless bases, after TSC measurements terminate, rifle is drawn be down to drawing rapidly
Carbon rifle position, it is ensured that low rifle position time 2min；The tapping time, tapping hole was without diffusing, and converter terminal temperature control is=1700 in 6min
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 is added together.
2 ﹚ CAS processes：Aluminum steel feeding speed is in 0.8m/t during CAS Argons, and CAS stations argon blowing time 15min, CAS are whole
Point composition P=0.008%, S≤0.003%, Alt=0.060%.
3）Fining cell：The first furnace temperature temperature control is wrapped in LF areas in 1660 DEG C, RH areas vacuum tank thermocouple temperature measurement point temperature
=1100 DEG C of degree, vacuum 950Pa, vacuum 20min of lower processing time, pure degassing time 10min；Calcium iron wire feed quantity 1.8m/
[Ca]=25ppm after t, wire-feeding velocity 240m/min, Calcium treatment, small argon flow amount argon blowing time 16min after line feeding,
In 4 ﹚ CCM processes：Using the dynamic gradual flexible soft reduction technique of continuous casting billet, Soft reduction rate is 0.80mm/min,
Drafts be gradual increase, minimum drafts 2mm, highest drafts 6mm, reduction ratio 1.6mm/m, pressure range FSC=
0.89, the constant pulling rate 0.85m/min of strand, weak water cooling is carried out in two cold-zones, and nozzle total Water is 2.5L/min.
5）In roller phase matching preparatory process：Roll change in advance before finishing mill rolls, rolls the other steel of similar width specification after roll change
Plate 40, treats heat, transition blank and X80 continuous rollings in advance.
In 6 ﹚ slab reheating operations：1 road water under high pressure dephosphorization is carried out, oxidized iron sheets on surface of casting blank, strand after dephosphorization is removed
Surface temperature control is at 1110 DEG C.
In 7 ﹚ roughing, finish rolling and ACC mode section cooling and aligning process：Horizontal-vertical rolling mode of continuous casting billet milling selection,
Rough rolling step steel plate biting speed 1.5m/s, mill speed 3.0m/s, roll 8 passages；Finishing mill is opened before rolling 13 passages, machine
Roll, finish to gauge surface temperature control is at 800 DEG C, and section cooling opens cold 790 DEG C of temperature, and 350 DEG C of surface of steel plate target final cooling temperature is cold
But mode is aligned using three passages afterwards, drafts is increased 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 are=1.5.
Embodiment 3
The thick-specification high-tenacity X80 pipe fitting steel steel plates of the present embodiment are 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：
0.20%, Ti: 0.013%,V：0.04%, Cu：The surplus of 0.15%, Pcm=0.20%, Ceq=0.46% is Fe and inevitably miscellaneous
Matter.
The preparation method of the thick-specification high-tenacity X80 pipe fitting steel steel plates of the present embodiment is as follows：
1）BOF processes：Using scrap smeltings such as high-quality edges of boards, useless bases, after TSC measurements terminate, rifle is drawn be down to drawing rapidly
Carbon rifle position, it is ensured that low rifle position time 1.5min；The tapping time in 6min, tapping hole without diffusing, converter terminal temperature control=
1675 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
Added together with steel scrap.
2 ﹚ CAS processes：Aluminum steel feeding speed is in 0.6m/t during CAS Argons, and CAS stations argon blowing time 15min, CAS are whole
Point composition P=0.006%, S≤0.004%, Alt=0.030%.
3）Fining cell：The first furnace temperature temperature control is wrapped in LF areas in 1650 DEG C, RH areas vacuum tank thermocouple temperature measurement point temperature
=1050 DEG C of degree, vacuum 970Pa, vacuum 20min of lower processing time, pure degassing time 10min；Calcium iron wire feed quantity 1.8m/
[Ca]=25ppm after t, wire-feeding velocity 240m/min, Calcium treatment, small argon flow amount argon blowing time 16min after line feeding,
In 4 ﹚ CCM processes：Using the dynamic gradual flexible soft reduction technique of continuous casting billet, Soft reduction rate is 0.80mm/min,
Drafts be gradual increase, minimum drafts 2mm, highest drafts 6mm, reduction ratio 1.6mm/m, pressure range FSC=
0.75, the constant pulling rate 0.85m/min of strand, weak water cooling is carried out in two cold-zones, and nozzle total Water is 2.5L/min.
5）In roller phase matching preparatory process：Roll change in advance before finishing mill rolls, rolls the other steel of similar width specification after roll change
Plate 40, treats heat, transition blank and X80 continuous rollings in advance.
In 6 ﹚ slab reheating operations：1 road water under high pressure dephosphorization is carried out, oxidized iron sheets on surface of casting blank, strand after dephosphorization is removed
Surface temperature control is at 1100 DEG C.
In 7 ﹚ roughing, finish rolling and ACC mode section cooling and aligning process：Horizontal-vertical rolling mode of continuous casting billet milling selection,
Rough rolling step steel plate biting speed 1.5m/s, mill speed 3.0m/s, roll 8 passages；Finishing mill is opened before rolling 13 passages, machine
Roll, finish to gauge surface temperature control is at 800 DEG C, and section cooling opens cold 780 DEG C of temperature, and 350 DEG C of surface of steel plate target final cooling temperature is cold
But mode is aligned using three passages afterwards, drafts is increased by passage,
8）After testing, the main performance of this example is as follows：Rt0.5 is 600MPa, and tensile strength Rm is 760MPa, Qu Qiang
Than 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 are=0.5.
Claims (6)
1. a kind of preparation method of thick-specification high-tenacity X80 pipe fittings steel steel plate, it is characterised in that thick-specification high-tenacity X80 is managed
Part 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；
Processing step includes successively：
Get the raw materials ready by composition proportion-offline the slow cooling of molten iron KR desulfurization process-BOF-CAS Argon-LF+RH-CCM- continuous casting billets 48 hours
The above-surface inspection, cleaning-roller phase matching preparation-slab reheating-roughing-high pressure water cooling-finish rolling-pre-straightening-ACC moulds
Formula section cooling-aligning-stacking slow cooling-ultrasonic examination；
BOF is specially：According to the thick-specification high-tenacity X80 pipe fittings steel of corresponding chemical composition proportion in BOF, using high-quality plate
Side, useless base are smelted, after TSC measurements terminate, and draw rifle be down to catch carbon rifle position rapidly, it is ensured that low rifle position time 1-2min, reduce slag
Middle FeO contents；The tapping time in 6min, tapping hole must not diffusing, reduce and inhale nitrogen, converter terminal temperature control 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
Added together with steel scrap；
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, highest drafts 6mm, reduction ratio 1.6mm/m, pressure range 0.5
＜ FSC ＜ 0.9, the constant pulling rate 0.85m/min of strand, weak water cooling is carried out in two cold-zones, and nozzle total Water is 2.5L/min；
In described roughing, finish rolling and ACC mode section cooling and aligning process, continuous casting billet milling selection 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 is rolled before 13 passages, machine
Open rolling, finish to gauge surface temperature control is at 800 DEG C, and section cooling opens cold 780 ± 10 DEG C of temperature, surface of steel plate target final cooling temperature
350 DEG C, mode is aligned using three passages after cooling, drafts is increased by passage.
2. a kind of preparation method of thick-specification high-tenacity X80 pipe fittings steel steel plate according to claim 1, it is characterised in that
Aluminum steel feeding speed is in 0.5-0.8m/t during CAS Argons, CAS stations argon blowing time 15min, CAS terminal composition P≤0.01%,
S≤0.005%, 0.020%≤Alt≤0.060%.
3. a kind of preparation method of thick-specification high-tenacity X80 pipe fittings steel steel plate according to claim 1, it is characterised in that
The first furnace temperature control molten steel out-station temperature after 1625-1660 DEG C, the second stove is wrapped in LF areas to control at 1620-1650 DEG C,
RH areas vacuum tank thermocouple temperature measurement point temperature >=1000 DEG C, vacuum ＜ 1000Pa, vacuum 20min of lower processing time are pure de-
Gas time 10min；Ensure [Ca]=10-25ppm after calcium iron wire feed quantity 1.8m/t, wire-feeding velocity 240m/min, Calcium treatment, feed
Small argon flow amount is blown into and ensures soft argon blowing time 16min after line.
4. a kind of preparation method of thick-specification high-tenacity X80 pipe fittings steel steel plate according to claim 1, it is characterised in that
In described roller phase matching preparatory process, Finish Mill Roll Changing rolls the other steel plate 35-40 branch of similar width specification after roll change,
And heat is treated in advance, it is ensured that transition blank and X80 continuous rollings.
5. a kind of preparation method of thick-specification high-tenacity X80 pipe fittings steel steel plate according to claim 1, it is characterised in that
In slab reheating operation, after the heated stove soaking of continuous casting billet is come out of the stove, 1 road water under high pressure dephosphorization is carried out, casting billet surface oxygen is removed
Change iron sheet, casting blank surface temperature control is at 1080 DEG C ~ 1110 DEG C after dephosphorization.
6. a kind of preparation method of thick-specification high-tenacity X80 pipe fittings steel steel plate according to claim 1, 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 |
| CN109550915B (en) * | 2017-09-25 | 2021-06-08 | 上海梅山钢铁股份有限公司 | Method for controlling center segregation and loosening of fine blanking steel continuous casting slab |
| CN108411197B (en) * | 2018-03-27 | 2020-01-24 | 宝钢湛江钢铁有限公司 | Thick X80 hot-rolled coil for phi 1422mm ultra-large-caliber spiral submerged arc welding pipe and manufacturing method thereof |
| 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 |
| CN109663818B (en) * | 2018-11-19 | 2021-03-02 | 包头钢铁（集团）有限责任公司 | Method for eliminating cracks generated in steel plate rolling process |
| CN110791702B (en) * | 2019-09-29 | 2021-04-02 | 鞍钢股份有限公司 | Marine steel plate with good welding performance and low yield ratio and manufacturing method thereof |
| 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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| CN101768703A (en) * | 2010-01-26 | 2010-07-07 | 东北大学 | Grade X80 pipe line steel with low yield ratio and manufacturing method thereof |
| CN103556079A (en) * | 2013-10-14 | 2014-02-05 | 宝鸡石油钢管有限责任公司 | High-strength water riser main-pipe with excellent anti-fatigue performance and manufacturing method thereof |
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| JPS589925A (en) * | 1981-07-09 | 1983-01-20 | Kawasaki Steel Corp | Production of api standard class x80 steel pipe of superior low temperature toughness |
| JPH09209038A (en) * | 1996-01-31 | 1997-08-12 | Nkk Corp | Production of high strength steel plate for line pipe excellent in hic resistance |
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| CN101768703A (en) * | 2010-01-26 | 2010-07-07 | 东北大学 | Grade X80 pipe line steel with low yield ratio and manufacturing method thereof |
| CN103556079A (en) * | 2013-10-14 | 2014-02-05 | 宝鸡石油钢管有限责任公司 | High-strength water riser main-pipe with excellent anti-fatigue performance and manufacturing method thereof |
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