CN107746940A - A kind of two-phase pipe line steel hot continuous rolling steel band and its production method - Google Patents
A kind of two-phase pipe line steel hot continuous rolling steel band and its production method Download PDFInfo
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- CN107746940A CN107746940A CN201710957998.8A CN201710957998A CN107746940A CN 107746940 A CN107746940 A CN 107746940A CN 201710957998 A CN201710957998 A CN 201710957998A CN 107746940 A CN107746940 A CN 107746940A
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
- C21D8/0426—Hot rolling
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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
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
Abstract
The invention discloses a kind of two-phase pipe line steel hot continuous rolling steel band and its production method, is related to metallurgical technology field, and the composition of the steel band includes：C, Si, Mn, P, S, Nb, Cr, Ti, V, Mo, Cu, Ni, B, Fe, inevitable impurity.Solve steel band in the prior art to produce using hot continuous rolling, mill speed is fast, particularly think gauge product cooling process is difficult to control, it is not easy effectively to control chilling temperature and phase transition process, so as to cause to be difficult to obtain preferable duplex structure, steel band the bad technical problem of cryogenic property, the preparation of the think gauge two-phase pipe line steel hot continuous rolling steel band with good low temperature performance is realized, available for the manufacture anti-large deformation spiral submerged welded pipe of heavy wall, there is Large strain ability, the technique effect of high intensity.
Description
Technical field
The present invention relates to metallurgical technology field, more particularly to a kind of two-phase pipe line steel hot continuous rolling steel band and its production method.
Background technology
Energy demand promotes the development of pipeline engineering, and pipe-line construction extends to harsher geological environment, and steel pipe needs full
The harsher service demand of foot, pipeline should also have in addition to it need to have excellent intensity and cryogenic property and bear necessarily to strain
Ability.At present, the large deformation pipe line steel of development is mostly steel sheet product, using vertical masonry joint submerged arc welding tubulation, and is used
Two-phase pipe line steel steel band carries out spiral welded into pipe almost without being related to.
But present inventor has found above-mentioned prior art extremely during technical scheme in realizing the embodiment of the present application
Following technical problem less be present：
Because steel band is produced using hot continuous rolling in the prior art, continuous rolling, mill speed is fast, and section cooling is difficult to realize
Complicated treats temperature cooling control, and particularly think gauge product cooling process is difficult to control, and is not easy effectively to control chilling temperature and phase
Change process, so as to cause to be difficult to the technical problem for obtaining preferable duplex structure, the cryogenic property of steel band deteriorates.
The content of the invention
The embodiments of the invention provide a kind of two-phase pipe line steel hot continuous rolling steel band and its production method, to solve existing skill
Steel band is produced using hot continuous rolling in art, and mill speed is fast, in the case of section cooling ability of regulation and control deficiency, so as to cause to be difficult to obtain
The bad technical problem of preferable duplex structure, the cryogenic property of steel band, realize the think gauge for preparing good low temperature performance
Two-phase pipe line steel hot continuous rolling steel band, there is Large strain ability, the technique effect of high intensity.
In order to solve the above problems, in a first aspect, the embodiments of the invention provide a kind of two-phase pipe line steel hot continuous rolling steel band,
The ingredient percent of the steel band is C：0.030-0.070wt%, Si：0.10-0.30wt%, Mn：1.55-
1.90wt%, P：≤ 0.012wt%, S：≤ 0.0020wt%, Nb：0.05-0.10wt%, Cr：0.10-0.40wt%, Ti：
0.010-0.030wt%, V：≤ 0.03wt%, Mo：0.10~0.30wt%, Cu:≤ 0.15wt%, Ni:0.05~
0.30wt%, B:≤ 0.0005wt%, remaining is Fe and inevitable impurity.
Preferably, thickness >=16mm of the steel band.
Preferably, the matrix of the steel band includes：Ferrite and bainite two-phase feature.
Preferably, yield strength Rt0.5 >=510MPa of the steel band, tensile strength Rm >=610MPa, yield tensile ratio≤
0.85。
Preferably, low-temperature impact ductile-brittle transition temperature≤- 50 DEG C of the steel band, low temperature drop hammer ductile-brittle transition temperature≤-
30℃。
Second aspect, it is described the embodiments of the invention provide a kind of its production method of two-phase pipe line steel hot continuous rolling steel band
Method using low S, P content, thickness 230~240mm specifications strand, cold conditions shove charge reheat, heating-up temperature be 1160~
1200 DEG C, equal temperature time is more than or equal to 35min；
Hot tandem is rolled, and controls last two reduction in pass of roughing：Reduction in pass 20 second from the bottom~
25%, last reduction in pass 22~27%, workpiece thickness is controlled in 56~60mm；
The passage of finish rolling 6~7, mill speed≤1.6m/s, finish rolling end reduction in pass >=10%；
Steel band after rolling uses common section cooling, the boiling water slow cooling of leading portion interval, the quick refrigerating mode of back segment.
Preferably, entry temperature at finishing≤920 DEG C, finishing temperature are 740~790 DEG C.
Preferably, the back segment rapid chilling section cooling manifold number is 4~6 groups, wherein, what the back segment quickly cooled down enters
Mouth temperature control is at 640~700 DEG C, and oiler temperature control is at 300~450 DEG C.
Said one or multiple technical schemes in the embodiment of the present invention, at least there is following one or more technology effects
Fruit：
1st, the embodiments of the invention provide a kind of two-phase pipe line steel hot continuous rolling steel band, the ingredient percent of the steel band
For C：0.030-0.070wt%, Si：0.10-0.30wt%, Mn：1.55-1.90wt%, P：≤ 0.012wt%, S：≤
0.0020wt%, Nb：0.05-0.10wt%, Cr：0.10-0.40wt%, Ti：0.010-0.030wt%, V：≤ 0.03wt%,
Mo：0.10~0.30wt%, Cu:≤ 0.15wt%, Ni:0.05~0.30wt%, B:≤ 0.0005wt%, remaining is for Fe and not
Evitable impurity.Solve it is of the prior art produced due to steel band in the prior art using hot continuous rolling, mill speed is fast, especially
It is that think gauge product cooling process is difficult to control, is not easy effectively to control chilling temperature and phase transition process, so as to cause to be difficult to obtain
The technical problem that preferable duplex structure, the cryogenic property of steel band deteriorate, the content of alloying element is added by controlling, further
Realize the intensity and toughness, crystal grain thinning, the technique effect for being effectively improved cryogenic property for improving steel.
2nd, the matrix of the invention by steel band, the matrix of the steel band include：Ferrite and bainite two-phase
Feature.Solve it is of the prior art produced due to steel band in the prior art using hot continuous rolling, mill speed is fast, particularly think gauge
Product cooling process is difficult to control, and is not easy effectively to control chilling temperature and phase transition process, preferably double so as to cause to be difficult to obtain
The technical problem that phase constitution, the cryogenic property of steel band deteriorate, realizing think gauge hot continuous rolling steel band has preferable duplex structure,
And the technique effect of high tenacity, high intensity.
3rd, yield strength, tensile strength of the present invention by steel band, yield strength Rt0.5 >=510MPa of the steel band,
Tensile strength Rm >=610MPa, yield tensile ratio≤0.85.Solve of the prior art because steel band in the prior art uses hot continuous rolling
Production, mill speed is fast, and particularly think gauge product cooling process is difficult to control, and is not easy effectively to control chilling temperature and phase transformation
Journey, so as to cause to be difficult to the technical problem for obtaining preferable duplex structure, the cryogenic property of steel band deteriorates, it furthermore achieved that thickness
Specification hot continuous rolling steel band improves adaptability to changes, the technique effect of high intensity.
4th, the embodiments of the invention provide a kind of its production method of two-phase pipe line steel hot continuous rolling steel band, methods described to use
Low S, P content, thickness are 1160~1200 DEG C in the strand of 230~240mm specifications, cold conditions shove charge reheating, heating-up temperature,
The warm time is more than or equal to 35min；Hot tandem is rolled, and controls last two reduction in pass of roughing：Passage second from the bottom
Drafts 20~25%, last reduction in pass 22~27%, workpiece thickness are controlled in 56~60mm；Finish rolling 6~7
It is secondary, mill speed≤1.6m/s, finish rolling end reduction in pass >=10%；Steel band after rolling uses common section cooling, leading portion
It is spaced boiling water slow cooling, the quick refrigerating mode of back segment.Solve of the prior art to give birth to using hot continuous rolling due to steel band in the prior art
Production, mill speed is fast, and particularly think gauge product cooling process is difficult to control, and is not easy effectively to control chilling temperature and phase transformation
Journey, so as to cause to be difficult to the technical problem for obtaining preferable duplex structure, the cryogenic property of steel band deteriorates, it is cold to improve conventional laminar flow
But the regulation and control space equipped, reaches duplex structure's target, while realizes the skill for the cryogenic property for improving think gauge dual phase steel band
Art effect.
5th, the present invention is 740~790 DEG C by finish rolling, entry temperature at finishing≤920 DEG C, finishing temperature.Solve existing
Have in technology because steel band in the prior art is produced using hot continuous rolling, mill speed is fast, particularly think gauge product cooling mistake
Journey is difficult to control, and is not easy effectively to control chilling temperature and phase transition process, so as to cause to be difficult to obtain preferable duplex structure, steel band
Cryogenic property deteriorate technical problem, ensure sufficiently flatization of austenite crystal, at the same realize obtain improved strain product
Technique effect that is tired, being laid a solid foundation for refinement phase-change organization.
6th, the present invention is quickly cooled down by back segment, and the back segment rapid chilling section cooling manifold number is 4~6 groups, wherein, institute
State the inlet temperature that back segment quickly cools down to control at 640~700 DEG C, oiler temperature control is at 300~450 DEG C.Solves existing skill
Being produced using hot continuous rolling due to steel band in the prior art in art, mill speed is fast, and particularly think gauge product cooling process is difficult
With control, be not easy effectively to control chilling temperature and phase transition process, so as to cause to be difficult to obtain preferable duplex structure, steel band it is low
The technical problem of warm penalty, using different rapid cooling inlet temperatures and low coiling temperature, make medium temperature bainitic transformation compared with
Fully completed under high cooling condition, obtain tiny ferrite crystal grain and bainite structure, realized and obtain preferable two-phase group
The technique effect knitted.
Described above is only the general introduction of technical solution of the present invention, in order to better understand the technological means of the present invention,
And can be practiced according to the content of specification, and in order to allow above and other objects of the present invention, feature and advantage can
Become apparent, below especially exemplified by the embodiment of the present invention.
Brief description of the drawings
Fig. 1 is a kind of duplex structure's schematic diagram of two-phase pipe line steel hot continuous rolling steel band in the embodiment of the present invention.
Embodiment
The embodiments of the invention provide a kind of two-phase pipe line steel hot continuous rolling steel band and its production method, to solve existing skill
Steel band is produced using hot continuous rolling in art, and mill speed is fast, and particularly think gauge product cooling process is difficult to control, and is not easy effectively to control
Chilling temperature and phase transition process processed, so as to cause to be difficult to the technology for obtaining preferable duplex structure, the cryogenic property of steel band deteriorates
Problem, the think gauge two-phase pipe line steel hot continuous rolling steel band for preparing good low temperature performance is realized, there is Large strain ability, high intensity
Technique effect.
Technical scheme in the embodiment of the present invention, general thought are as follows：Using low S, P content, thickness is in 230~240mm
The strand of specification, cold conditions shove charge reheat, and heating-up temperature is 1160~1200 DEG C, and equal temperature time is more than or equal to 35min；Hot continuous rolling
Unit is rolled, and controls last two reduction in pass of roughing：Reduction in pass 20~25% second from the bottom, last a time pressure
Lower amount 22~27%, workpiece thickness are controlled in 56~60mm；The passage of finish rolling 6~7, mill speed≤1.6m/s, finish rolling extreme trace
Secondary drafts >=10%；Steel band after rolling uses common section cooling, and the boiling water slow cooling of leading portion interval, back segment quickly cool down mould
Formula, low temperature batch acquisition steel band, and the steel band ingredient percent is C：0.030-0.070wt%, Si：0.10-
0.30wt%, Mn：1.55-1.90wt%, P：≤ 0.012wt%, S：≤ 0.0020wt%, Nb：0.05-0.10wt%, Cr：
0.10-0.40wt%, Ti：0.010-0.030wt%, V：≤ 0.03wt%, Mo：0.10~0.30wt%, Cu:≤
0.15wt%, Ni:0.05~0.30wt%, B:≤ 0.0005wt%, remaining is Fe and inevitable impurity.Solves existing skill
Steel band is produced using hot continuous rolling in art, and mill speed is fast, and particularly think gauge product air cooling temperature drop is slow, is not easy effectively control cooling
Temperature and phase transition process, it is real so as to cause to be difficult to the technical problem for obtaining preferable duplex structure, the cryogenic property of steel band deteriorates
The think gauge two-phase pipe line steel hot continuous rolling steel band for preparing good low temperature performance is showed, there is Large strain ability, the technology of high intensity
Effect.
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Embodiment one
The embodiments of the invention provide a kind of two-phase pipe line steel hot continuous rolling steel band, the ingredient percent of the steel band is
C：0.030-0.070wt%, Si：0.10-0.30wt%, Mn：1.55-1.90wt%, P：≤ 0.012wt%, S：≤
0.0020wt%, Nb：0.05-0.10wt%, Cr：0.10-0.40wt%, Ti：0.010-0.030wt%, V：≤ 0.03wt%,
Mo：0.10-0.30wt%, Cu:≤ 0.15wt%, Ni:0.05-0.30wt%, B:≤ 0.0005wt%, remaining is Fe and can not
The impurity avoided.
Further, thickness >=16mm of the steel band.The matrix of the steel band includes：Ferrite and bainite are double
Phase character.Yield strength Rt0.5 >=510MPa of the steel band, tensile strength Rm >=610MPa, yield tensile ratio≤0.85；The steel
Low-temperature impact ductile-brittle transition temperature≤- 50 DEG C of band, low temperature drop hammer ductile-brittle transition temperature≤- 30 DEG C.
Specifically, the composition of the steel band includes：C mass percent is 0.03-0.07wt%, C：Most passed through in steel
Ji, most basic intensified element, too high C content will reduce the toughness of steel, to ensure the low-temperature flexibility of duplex structure, should not add
Too high C element.Si mass percent is 0.10-0.30wt%, Si：With the intensity of solution strengthening form raising steel, but compared with
More Si contents will cause serious surface problem.Mn mass percent is 1.55-1.90wt%, Mn：Solution strengthening element, can have
Proof strength, while fine grain positive effect are imitated, but too high will likely bring of Mn is segregated among serious, in laminar cooling process, in
Between segregation will suppress ferrite transformation, be also easy to get to hard phase constitution under low cooling condition, obtain extremely uneven duplex structure, should
Apparent thickness is different to add suitable Mn amounts, should not use too high Mn.P：≤ 0.012wt%；S：≤ 0.0020wt%, P, S are equal
For objectionable impurities elements, material fragility will be increased, more apparent, the two-phase particularly in high temperature slow cooling production is influenceed on low-temperature flexibility
In tissue, the tissue is more more sensitive than the acicular ferrite structure that rapid cooling obtains.Nb mass percent is 0.05-0.10wt%,
Nb：Fine grain positive effect, obdurability can be significantly improved, grain coarsening can be suppressed by adding a certain amount of Nb microalloys.Ti quality
Percentage is 0.010-0.030wt%, Ti：Microalloy element, micro addition are mainly solid N, while tiny precipitation is being heated
Stage can suppress austenite roughening.V≤0.03wt%, V：Microalloy element, there are solid solution and precipitation strength effect, particularly in iron
Precipitation in ferritic, but due in the duplex structure ferrite transformation occur temperature it is higher, afterwards in rapid cooling V separate out again pressed down
System, should not add excessive V.Cr：0.10-0.40wt%, Mo：0.10~0.30wt%, Mo, Cr:With relatively strong molten reinforcing
Effect, quenching degree can be effectively improved, the tissue inter-variable that can optimize back segment rapid cooling obtains higher intensity.Cu≤0.15wt%, Ni：
0.05~0.30wt%, Cu, Ni：With certain solid solution strengthening effect, while Ni elements can effectively improve cryogenic property, but Ni is closed
Golden cost is higher, and Cu can optimize decay resistance, and visual user requires situation addition or do not added.
The thickness of the steel band is not less than 16mm, belongs to the steel band of think gauge.It refer to Fig. 1, the matrix group of the steel band
Knit including：Ferrite and bainite two-phase feature, crystal grain is tiny, the uniform plastic that improves material, the skill with Large strain ability
Art effect.
Yield strength Rt0.5 >=510MPa of the steel band, tensile strength Rm >=610MPa, yield tensile ratio≤0.85, Qu Qiang
Plasticity than low expression material is preferable, and the non-deformability of the high expression material of yield tensile ratio is stronger；The low-temperature impact of the steel band is tough
Crisp transition temperature≤- 50 DEG C, low temperature drop hammer ductile-brittle transition temperature≤- 30 DEG C, have the regulation and control for improving conventional laminar flow cooling equipment
Space, while improve the technique effect of the cryogenic property of think gauge dual phase steel band.
Embodiment two
The embodiments of the invention provide a kind of its production method of two-phase pipe line steel hot continuous rolling steel band, methods described is using low
S, P content, thickness are 1160~1200 DEG C in the strand of 230~240mm specifications, cold conditions shove charge reheating, heating-up temperature, samming
Time is more than or equal to 35min；Hot tandem is rolled, and controls last two reduction in pass of roughing：Passage pressure second from the bottom
Lower amount 20~25%, last reduction in pass 22~27%, workpiece thickness are controlled in 56~60mm；The passage of finish rolling 6~7,
Mill speed≤1.6m/s, finish rolling end reduction in pass >=10%；Steel band after rolling uses common section cooling, leading portion interval
Boiling water slow cooling, the quick refrigerating mode of back segment.
Further, entry temperature at finishing≤920 DEG C, finishing temperature are 740~790 DEG C.The fast quickly cooling of back segment
But section cooling manifold number is 4~6 groups.The control of inlet temperature that the back segment quickly cools down is at 640~700 DEG C, coiling temperature control
System is at 300~450 DEG C.
Specifically, pouring molten steel process carries out dynamic soft-reduction in solidification end, inclined so as to reach mitigation slab center
The purpose of analysis, pours into 230~240mm thickness continuous casting billets, under strand ray examination, scafing ensure steel strip surface quality；Casting
The shove charge of base cold conditions reheats, and heating-up temperature is 1160~1200 DEG C, equal temperature time >=35min, using appropriate heating-up temperature and
Sufficient soaking time, ensure that each regional temperature of strand is uniform, micro alloying element is fully dissolved while prevents that austenite is undue
And uneven grow up；The hot tandem is rolled, and controls last two reduction in pass of roughing：Passage pressure second from the bottom
Amount 20~25%, last reduction in pass 22~27%, by effectively recrystallizing full and uniform fining austenite grains, obtain
Fine austenite crystal grain；Workpiece thickness regards thickness of strips, controls in 56~60mm.
The entry temperature at finishing is less than or equal to 920 DEG C, the passage of finish rolling 6~7, mill speed≤1.6m/s；Finish rolling extreme trace
Secondary drafts >=10%, finishing temperature are 740~790 DEG C；Ensure sufficiently flatization of austenite crystal, while obtain higher answer
Become accumulation, phase-change organization lays a solid foundation for refinement, while can properly increase the phase transition temperature under the conditions of slow cooling, expands bayesian body phase
Become regulation and control space, reduce mill speed, the time of laminar flow cooling section can be extended, increase cooling regulation and control space.
Steel band after rolling uses common section cooling, using the boiling water slow cooling of leading portion interval, the quick refrigerating mode of back segment, after
Section rapid chilling section cooling manifold number ensures that back segment quickly cools down inlet temperature control at 640~700 DEG C, batches at 4~6 groups
Temperature control is at 300~450 DEG C.Experiment and actual production show, on the basis of conventional hot continuous rolling machine section cooling equipment, between leading portion
Separate water and carry out slow cooling, properly increase low cooling rate, ensure to obtain tiny ferritic structure；Back segment is relatively low using being cooled fast to
Coiling temperature, the sufficient bainite structure of phase transformation is obtained, reaches duplex structure's target.Using the boiling water slow cooling of leading portion interval, can contract
The short slow cooling section time, avoid using back segment rapid cooling cooling capacity deficiency caused by air cooling slow cooling, while using water cooling spaced apart
The cooling velocity of think gauge steel band can be properly increased, is so advantageous to refine high-temperature phase-change tissue, while regards thickness of strips, is used
Different rapid cooling inlet temperatures and low coiling temperature, make medium temperature bainitic transformation fully be completed under the conditions of higher cooling rate, obtain
Tiny ferrite crystal grain and bainite structure；It is final that a kind of two-phase pipe line steel hot continuous rolling steel with good low temperature performance is made
Band.
Embodiment three
It is 20mm the embodiments of the invention provide a kind of two-phase pipe line steel hot continuous rolling thickness of strips specification；
The embodiments of the invention provide a kind of two-phase pipe line steel hot continuous rolling steel band, connects by using a kind of two-phase pipe line steel heat
Its production method of strip rolling produces two kinds of steel bands, and example 1, the chemical composition 1,2 of 2 steel bands are as shown in table 1, the steel band
Composition includes：C, Si, Mn, P, S, Nb, Cr, Ti, V, Mo, Ni, B, Fe, impurity, by adding appropriate alloying element, realize
The intensity and toughness, crystal grain thinning of raising steel band, quenching degree is improved, cryogenic property is effectively improved, strengthens solid solution strengthening effect, be excellent
Change the technique effect of decay resistance.
A kind of chemical composition of two-phase pipe line steel hot continuous rolling steel band example 1,2 of the present invention of table 1, wt%
The embodiments of the invention provide a kind of every test result such as table 2 of two-phase pipe line steel hot continuous rolling steel band example 1,2,
Shown in table 3, table 4, by detecting the tensile property, low-temperature impact toughness and low temperature DWTT performances of steel band example 1,2, the steel band
Yield strength Rt0.5 >=510MPa, tensile strength Rm >=610MPa, yield tensile ratio≤0.85, the low-temperature impact of the steel band is tough
Crisp transition temperature≤- 50 DEG C, low temperature drop hammer ductile-brittle transition temperature≤- 30 DEG C, have the regulation and control for improving conventional laminar flow cooling equipment
Space, reach and improved adaptability to changes, high intensity, the technique effect of good low temperature performance.
A kind of tensile property of two-phase pipe line steel hot continuous rolling steel band example 1,2 of the present invention of table 2
The present invention of the table 3 a kind of low-temperature impact toughness and low temperature DWTT performances of two-phase pipe line steel hot continuous rolling steel band example 1,2
The serial low-temperature impact toughness and serial low temperature of a kind of two-phase pipe line steel hot continuous rolling steel band example 1,2 of the present invention of table 4
DWTT performances
The technical scheme provided in the embodiment of the present application, has at least the following technical effects or advantages：
1st, the embodiments of the invention provide a kind of two-phase pipe line steel hot continuous rolling steel band, the ingredient percent of the steel band
For C：0.030-0.070wt%, Si：0.10-0.30wt%, Mn：1.55-1.90wt%, P：≤ 0.012wt%, S：≤
0.0020wt%, Nb：0.05-0.10wt%, Cr：0.10-0.40wt%, Ti：0.010-0.030wt%, V：≤ 0.03wt%,
Mo：0.10~0.30wt%, Cu:≤ 0.15wt%, Ni:0.05~0.30wt%, B:≤ 0.0005wt%, remaining is for Fe and not
Evitable impurity.Solve it is of the prior art produced due to steel band in the prior art using hot continuous rolling, mill speed is fast, especially
It is that think gauge product cooling process is difficult to control, is not easy effectively to control chilling temperature and phase transition process, so as to cause to be difficult to obtain
The technical problem that preferable duplex structure, the cryogenic property of steel band deteriorate, the content of alloying element is added by controlling, further
Realize the intensity and toughness, crystal grain thinning, the technique effect for being effectively improved cryogenic property for improving steel.
2nd, the matrix of the invention by steel band, the matrix of the steel band include：Ferrite and bainite two-phase
Feature.Solve it is of the prior art produced due to steel band in the prior art using hot continuous rolling, mill speed is fast, particularly think gauge
Product cooling process is difficult to control, and is not easy effectively to control chilling temperature and phase transition process, preferably double so as to cause to be difficult to obtain
The technical problem that phase constitution, the cryogenic property of steel band deteriorate, realizing think gauge hot continuous rolling steel band has preferable duplex structure,
And the technique effect of high tenacity, high intensity.
3rd, yield strength, tensile strength of the present invention by steel band, yield strength Rt0.5 >=510MPa of the steel band,
Tensile strength Rm >=610MPa, yield tensile ratio≤0.85.Solve of the prior art because steel band in the prior art uses hot continuous rolling
Production, mill speed is fast, and particularly think gauge product cooling process is difficult to control, and is not easy effectively to control chilling temperature and phase transformation
Journey, so as to cause to be difficult to the technical problem for obtaining preferable duplex structure, the cryogenic property of steel band deteriorates, it furthermore achieved that thickness
Specification hot continuous rolling steel band improves adaptability to changes, the technique effect of high intensity.
4th, the embodiments of the invention provide a kind of its production method of two-phase pipe line steel hot continuous rolling steel band, methods described to use
Low S, P content, thickness are 1160~1200 DEG C in the strand of 230~240mm specifications, cold conditions shove charge reheating, heating-up temperature,
The warm time is more than or equal to 35min；Hot tandem is rolled, and controls last two reduction in pass of roughing：Passage second from the bottom
Drafts 20~25%, last reduction in pass 22~27%, workpiece thickness are controlled in 56~60mm；Finish rolling 6~7
It is secondary, mill speed≤1.6m/s, finish rolling end reduction in pass >=10%；Steel band after rolling uses common section cooling, leading portion
It is spaced boiling water slow cooling, the quick refrigerating mode of back segment.Solve of the prior art to give birth to using hot continuous rolling due to steel band in the prior art
Production, mill speed is fast, and particularly think gauge product cooling process is difficult to control, and is not easy effectively to control chilling temperature and phase transformation
Journey, so as to cause to be difficult to the technical problem for obtaining preferable duplex structure, the cryogenic property of steel band deteriorates, it is cold to improve conventional laminar flow
But the regulation and control space equipped, reaches duplex structure's target, while realizes the skill for the cryogenic property for improving think gauge dual phase steel band
Art effect.
5th, the present invention is 740~790 DEG C by finish rolling, entry temperature at finishing≤920 DEG C, finishing temperature.Solve existing
Have in technology because steel band in the prior art is produced using hot continuous rolling, mill speed is fast, particularly think gauge product cooling mistake
Journey is difficult to control, and is not easy effectively to control chilling temperature and phase transition process, so as to cause to be difficult to obtain preferable duplex structure, steel band
Cryogenic property deteriorate technical problem, ensure sufficiently flatization of austenite crystal, at the same realize obtain improved strain product
Technique effect that is tired, being laid a solid foundation for refinement phase-change organization.
6th, the present invention is quickly cooled down by back segment, and the back segment rapid chilling section cooling manifold number is 4~6 groups, wherein, institute
State the inlet temperature that back segment quickly cools down to control at 640~700 DEG C, oiler temperature control is at 300~450 DEG C.Solves existing skill
Being produced using hot continuous rolling due to steel band in the prior art in art, mill speed is fast, and particularly think gauge product cooling process is difficult
With control, be not easy effectively to control chilling temperature and phase transition process, so as to cause to be difficult to obtain preferable duplex structure, steel band it is low
The technical problem of warm penalty, using different rapid cooling inlet temperatures and low coiling temperature, make medium temperature bainitic transformation compared with
Fully completed under high cooling condition, obtain tiny ferrite crystal grain and bainite structure, realized and obtain preferable two-phase group
The technique effect knitted.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make other change and modification to these embodiments.So appended claims be intended to be construed to include it is excellent
Select embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification without departing from this hair to the embodiment of the present invention
The spirit and scope of bright embodiment.So, if these modifications and variations of the embodiment of the present invention belong to the claims in the present invention
And its within the scope of equivalent technologies, then the present invention is also intended to comprising including these changes and modification.
Claims (8)
1. a kind of two-phase pipe line steel hot continuous rolling steel band, it is characterised in that the ingredient percent of the steel band is C：0.030-
0.070wt%, Si：0.10-0.30wt%, Mn：1.55-1.90wt%, P：≤ 0.012wt%, S：≤ 0.0020wt%, Nb：
0.05-0.10wt%, Cr：0.10-0.40wt%, Ti：0.010-0.030wt%, V：≤ 0.03wt%, Mo：0.10~
0.30wt%, Cu:≤ 0.15wt%, Ni:0.05~0.30wt%, B:≤ 0.0005wt%, remaining is for Fe and inevitably
Impurity.
2. steel band as claimed in claim 1, it is characterised in that thickness >=16mm of the steel band.
3. steel band as claimed in claim 1, it is characterised in that the matrix of the steel band includes：Ferrite and bainite
Two-phase feature.
4. steel band as claimed in claim 1, it is characterised in that yield strength Rt0.5 >=510MPa of the steel band, tension are strong
Spend Rm >=610MPa, yield tensile ratio≤0.85.
5. steel band as claimed in claim 1, it is characterised in that low-temperature impact ductile-brittle transition temperature≤- 50 DEG C of the steel band,
Low temperature drops hammer ductile-brittle transition temperature≤- 30 DEG C.
A kind of 6. its production method of two-phase pipe line steel hot continuous rolling steel band, it is characterised in that methods described uses low S, P content,
Thickness is 1160~1200 DEG C in the strand of 230~240mm specifications, cold conditions shove charge reheating, heating-up temperature, equal temperature time >=
35min；
Hot tandem is rolled, and controls last two reduction in pass of roughing：Reduction in pass 20~25% second from the bottom, most
Latter reduction in pass 22~27%, workpiece thickness are controlled in 56~60mm；
The passage of finish rolling 6~7, mill speed≤1.6m/s, finish rolling end reduction in pass >=10%；
Steel band after rolling uses common section cooling, the boiling water slow cooling of leading portion interval, the quick refrigerating mode of back segment.
7. finish rolling as claimed in claim 6, it is characterised in that entry temperature at finishing≤920 DEG C, finishing temperature 740
~790 DEG C.
8. back segment as claimed in claim 6 quickly cools down, it is characterised in that the back segment rapid chilling section cooling manifold number is
4~6 groups, wherein, the inlet temperature that the back segment quickly cools down is controlled at 640~700 DEG C, and oiler temperature control is 300~450
℃。
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| CN1785544A (en) * | 2005-12-15 | 2006-06-14 | 广州珠江钢铁有限责任公司 | Technology of eliminating Nb microalloyed steel mixed crystal fexture in thin plate blank continuous casting continuous milling process |
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| CN1785544A (en) * | 2005-12-15 | 2006-06-14 | 广州珠江钢铁有限责任公司 | Technology of eliminating Nb microalloyed steel mixed crystal fexture in thin plate blank continuous casting continuous milling process |
| CN101962733A (en) * | 2010-10-29 | 2011-02-02 | 北京科技大学 | Low-cost and high-toughness X80 pipe steel with high deformation resistance and manufacture method thereof |
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