CN107746940B - 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
- Publication number
- CN107746940B CN107746940B CN201710957998.8A CN201710957998A CN107746940B CN 107746940 B CN107746940 B CN 107746940B CN 201710957998 A CN201710957998 A CN 201710957998A CN 107746940 B CN107746940 B CN 107746940B
- Authority
- CN
- China
- Prior art keywords
- steel band
- temperature
- continuous rolling
- hot continuous
- steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a kind of two-phase pipe line steel hot continuous rolling steel band and its production methods, are related to metallurgical technology field, and the ingredient of the steel band includes: C, Si, Mn, P, S, Nb, Cr, Ti, V, Mo, Cu, Ni, B, Fe, inevitable impurity.Steel band in the prior art is solved to produce using hot continuous rolling, mill speed is fast, especially think gauge product cooling procedure is difficult to control, it is not easy effectively to control cooling temperature and phase transition process, the bad technical problem of cryogenic property to cause to be difficult to obtain ideal duplex structure, steel band, the preparation for realizing the think gauge two-phase pipe line steel hot continuous rolling steel band with good low temperature performance, can be used for manufacturing the anti-large deformation spiral submerged welded pipe of heavy wall, with Large strain ability, high-intensitive technical effect.
Description
Technical field
The present invention relates to metallurgical technology field, in particular to a kind of two-phase pipe line steel hot continuous rolling steel band and its production method.
Background technique
Energy demand pushes 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 the certain strain of receiving other than need to have excellent intensity and cryogenic property
Ability.Currently, the large deformation pipe line steel of development is mostly steel sheet product, using vertical masonry joint submerged arc welding tubulation, and use
Two-phase pipe line steel steel band carries out spiral welded into pipe almost without being related to.
But present inventor during technical solution, has found the above-mentioned prior art extremely in realizing the embodiment of the present application
It has the following technical problems less:
Since steel band is using hot continuous rolling production in the prior art, continuous rolling, mill speed is fast, and section cooling is difficult to realize
Complicated controls to temperature cooling, and especially think gauge product cooling procedure is difficult to control, and is not easy effectively to control cooling temperature and phase
Change process, to cause to be difficult to obtain ideal duplex structure, the technical issues of cryogenic property of steel band deteriorates.
Summary of the invention
The embodiment of the invention provides a kind of two-phase pipe line steel hot continuous rolling steel band and its production methods, to solve existing skill
Steel band is produced using hot continuous rolling in art, and mill speed is fast, in the insufficient situation of section cooling ability of regulation and control, to cause to be difficult to obtain
Ideal duplex structure, steel band the bad technical problem of cryogenic property, realize the think gauge for preparing good low temperature performance
Two-phase pipe line steel hot continuous rolling steel band, with Large strain ability, high-intensitive technical effect.
To solve the above-mentioned problems, in a first aspect, the embodiment of the invention provides 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 embodiment of the invention provides a kind of its production method of two-phase pipe line steel hot continuous rolling steel band
Method use low S, P content, thickness 230~240mm specification slab, cold conditions shove charge reheat, heating 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 second from the bottom 20~
25%, last reduction in pass 22~27%, workpiece thickness is controlled in 56~60mm；
6~7 passage of finish rolling, mill speed≤1.6m/s, finish rolling end reduction in pass >=10%；
Steel band after rolling uses common section cooling, and the boiled water slow cooling of leading portion interval, back segment are quickly cooled down mode.
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 was 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 solutions in the embodiment of the present invention at least have following one or more technology effects
Fruit:
1, the embodiment of the invention provides a kind of two-phase pipe line steel hot continuous rolling steel band, the ingredient percents 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 in 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 procedure is difficult to control, is not easy effectively to control cooling temperature and phase transition process, to cause to be difficult to obtain
Ideal duplex structure, steel band cryogenic property the technical issues of deteriorating, by the content of control addition alloying element, further
Realize the intensity for improving steel and toughness, the technical effect that refines crystal grain, be effectively improved cryogenic property.
2, for the present invention by the matrix of steel band, the matrix of the steel band includes: ferrite and bainite two-phase
Feature.Solve it is in the prior art produced due to steel band in the prior art using hot continuous rolling, mill speed is fast, especially think gauge
Product cooling procedure is difficult to control, and is not easy effectively to control cooling temperature and phase transition process, to cause to be difficult to obtain ideal double
Cryogenic property the technical issues of deteriorating of phase constitution, steel band, realize think gauge hot continuous rolling steel band with ideal duplex structure,
And high tenacity, the technical effect of high intensity.
3, 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.It solves in the prior art since steel band in the prior art uses hot continuous rolling
Production, mill speed is fast, and especially think gauge product cooling procedure is difficult to control, and is not easy effectively to control cooling temperature and phase transformation
Thickness is furthermore achieved to cause to be difficult to obtain ideal duplex structure, the technical issues of cryogenic property of steel band deteriorates in journey
Specification hot continuous rolling steel band improves adaptability to changes, high-intensitive technical effect.
4, the embodiment of the invention provides a kind of its production method of two-phase pipe line steel hot continuous rolling steel band, the method is used
Low S, P content, slab of the thickness in 230~240mm specification, cold conditions shove charge reheating, heating temperature is 1160~1200 DEG C,
The warm time is more than or equal to 35min；Hot tandem is rolled, and last two reduction in pass of roughing: passage second from the bottom is controlled
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 boiled water slow cooling, back segment is quickly cooled down mode.It solves in the prior art raw using hot continuous rolling due to steel band in the prior art
It produces, mill speed is fast, and especially think gauge product cooling procedure is difficult to control, and is not easy effectively to control cooling temperature and phase transformation
It is cold to improve conventional laminar flow to cause to be difficult to obtain ideal duplex structure, the technical issues of cryogenic property of steel band deteriorates for journey
But the regulation space equipped, reaches duplex structure's target, while realizing the skill for improving the cryogenic property of think gauge dual phase steel band
Art effect.
5, the present invention is by finish rolling, and entry temperature at finishing≤920 DEG C, finishing temperature is 740~790 DEG C.It solves existing
Have in technology since steel band in the prior art is produced using hot continuous rolling, mill speed is fast, and especially think gauge product is cooled
Journey is difficult to control, and is not easy effectively to control cooling temperature and phase transition process, to cause to be difficult to obtain ideal duplex structure, steel band
Cryogenic property deteriorate the technical issues of, guarantee sufficiently flatization of austenite grain, at the same realize obtain improved strain product
Technical effect that is tired, laying a solid foundation for refinement phase-change organization.
6, 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
The inlet temperature for stating back segment rapid cooling is controlled at 640~700 DEG C, and oiler temperature control is at 300~450 DEG C.Solve existing skill
Being produced using hot continuous rolling due to steel band in the prior art in art, mill speed is fast, and especially think gauge product cooling procedure is difficult
With control, be not easy effectively to control cooling temperature and phase transition process, thus cause to be difficult to obtain ideal duplex structure, steel band it is low
The technical issues of warm penalty, using different rapid cooling inlet temperatures and low coiling temperature, make medium temperature bainitic transformation compared with
It is sufficiently completed under high cooling condition, obtains tiny ferrite crystal grain and bainite structure, realized and obtain ideal two-phase group
The technical effect knitted.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And it can be implemented in accordance with the contents of the specification, and in order to allow above and other objects of the present invention, feature and advantage can
It is clearer and more comprehensible, the followings are specific embodiments of the present invention.
Detailed description of the invention
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.
Specific embodiment
The embodiment of the invention provides a kind of two-phase pipe line steel hot continuous rolling steel band and its production methods, to solve existing skill
Steel band is produced using hot continuous rolling in art, and mill speed is fast, and especially think gauge product cooling procedure is difficult to control, and is not easy effectively to control
Cooling temperature and phase transition process processed, to cause the technology for being difficult to obtain ideal duplex structure, the cryogenic property of steel band deteriorates
Problem realizes the think gauge two-phase pipe line steel hot continuous rolling steel band for preparing good low temperature performance, has Large strain ability, high intensity
Technical effect.
Technical solution in the embodiment of the present invention, general thought are as follows: using low S, P content, thickness is in 230~240mm
The slab of specification, cold conditions shove charge reheat, and heating temperature is 1160~1200 DEG C, and equal temperature time is more than or equal to 35min；Hot continuous rolling
Unit is rolled, and last two reduction in pass of roughing: reduction in pass 20~25% second from the bottom, last a time pressure is controlled
Lower amount 22~27%, workpiece thickness are controlled in 56~60mm；6~7 passage of finish rolling, mill speed≤1.6m/s, finish rolling extreme trace
Secondary drafts >=10%；Steel band after rolling uses common section cooling, and the boiled water slow cooling of leading portion interval, back segment are quickly cooled 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.Solve existing skill
Steel band is produced using hot continuous rolling in art, and mill speed is fast, and the especially air-cooled temperature drop of think gauge product is slow, is not easy effectively to control cooling
Temperature and phase transition process, thus cause to be difficult to obtain ideal duplex structure, the technical issues of cryogenic property of steel band deteriorates, it is real
The think gauge two-phase pipe line steel hot continuous rolling steel band for preparing good low temperature performance is showed, with Large strain ability, high-intensitive technology
Effect.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Embodiment one
The embodiment of the invention provides 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: that 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 mass percent that the ingredient of the steel band includes: C is 0.03-0.07wt%, C: most being passed through in steel
Ji, most basic intensified element, excessively high C content will reduce the toughness of steel, for the low-temperature flexibility for guaranteeing duplex structure, should not add
Excessively high C element.The mass percent of Si is 0.10-0.30wt%, Si: with the intensity of solution strengthening form raising steel, but compared with
More Si contents will lead to serious surface problem.The mass percent of Mn is 1.55-1.90wt%, Mn: solution strengthening element can have
Proof strength is imitated, while fine grain effect is obvious, but excessively high will likely bring of Mn is segregated among serious, in laminar cooling process, in
Between segregation will inhibit ferrite transformation, be also easy to get under low cooling condition to hard phase constitution, obtain extremely non-uniform duplex structure, answer
Apparent thickness difference adds suitable Mn amount, should not use excessively high Mn.P :≤0.012wt%；S :≤0.0020wt%, P, S are equal
For objectionable impurities elements, material fragility will be increased, more apparent two-phase especially in high temperature slow cooling production is influenced on low-temperature flexibility
In tissue, the tissue is more more sensitive than the acicular ferrite structure that rapid cooling obtains.The mass percent of Nb is 0.05-0.10wt%,
Nb: fine grain effect is obvious, can significantly improve obdurability, and grain coarsening can be inhibited by adding a certain amount of Nb microalloy.The quality of Ti
Percentage is 0.010-0.030wt%, Ti: microalloy element, and micro addition is mainly solid N, while tiny precipitation is being heated
Stage can inhibit austenite to be roughened.V≤0.03wt%, V: microalloy element has solid solution and precipitation strength effect, especially in iron
Precipitation in ferritic, but due in the duplex structure ferrite transformation occur temperature it is higher, later in rapid cooling V be precipitated again pressed down
System, should not add excessive V.Cr:0.10-0.40wt%, Mo:0.10~0.30wt%, Mo, Cr: there is relatively strong molten reinforcing
Effect can effectively improve harden ability, and the tissue inter-variable that can optimize back segment rapid cooling obtains higher intensity.Cu≤0.15wt%, Ni:
0.05~0.30wt%, Cu, Ni: there is certain solid solution strengthening effect, while Ni element can effectively improve cryogenic property, but Ni is closed
Golden higher cost, Cu can optimize corrosion resistance, and visual user requires situation addition or do not add.
The thickness of the steel band is not less than 16mm, belongs to the steel band of think gauge.Referring to FIG. 1, the matrix group of the steel band
Knitting includes: ferrite and bainite two-phase feature, and 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
Preferable than the low plasticity for indicating material, yield tensile ratio height indicates that the non-deformability of material 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 for improving conventional laminar flow cooling equipment
Space, while improving the technical effect of the cryogenic property of think gauge dual phase steel band.
Embodiment two
The embodiment of the invention provides a kind of its production method of two-phase pipe line steel hot continuous rolling steel band, the method is using low
S, P content, slab of the thickness in 230~240mm specification, cold conditions shove charge reheating, heating temperature is 1160~1200 DEG C, samming
Time is more than or equal to 35min；Hot tandem is rolled, and last two reduction in pass of roughing: passage pressure second from the bottom is controlled
Lower amount 20~25%, last reduction in pass 22~27%, workpiece thickness are controlled in 56~60mm；6~7 passage of finish rolling,
Mill speed≤1.6m/s, finish rolling end reduction in pass >=10%；Steel band after rolling uses common section cooling, leading portion interval
Boiled water slow cooling, back segment are quickly cooled down mode.
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 inlet temperature control that the back segment is quickly cooled 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, so that it is inclined to reach mitigation slab center
The purpose of analysis pours into 230~240mm thickness continuous casting billet, and ray examination, scafing guarantee steel strip surface quality under slab；Casting
Base cold conditions shove charge reheats, and heating temperature is 1160~1200 DEG C, equal temperature time >=35min, using heating temperature appropriate and
Sufficient soaking time guarantees that each regional temperature of slab is uniform, and micro alloying element is sufficiently dissolved while preventing austenite excessive
And it unevenly grows up；The hot tandem is rolled, and last two reduction in pass of roughing is controlled: passage pressure second from the bottom
Amount 20~25%, last reduction in pass 22~27% are obtained by effectively recrystallizing full and uniform fining austenite grains
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, 6~7 passage of finish rolling, mill speed≤1.6m/s；Finish rolling extreme trace
Secondary drafts >=10%, finishing temperature are 740~790 DEG C；Guarantee sufficiently flatization of austenite grain, while obtaining 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 bainite phase
Modified tone control space, reduces mill speed, can extend the time of laminar flow cooling section, increases cooling regulation space.
Steel band after rolling uses common section cooling, is quickly cooled down mode using the boiled water slow cooling of leading portion interval, back segment, after
Section rapid chilling section cooling manifold number guarantees that back segment is quickly cooled down inlet temperature control at 640~700 DEG C at 4~6 groups, batches
Temperature is controlled at 300~450 DEG C.Test and actual production show on the basis of conventional hot continuous rolling machine section cooling is equipped, between leading portion
It separates water and carries out slow cooling, properly increase low cooling rate, guarantee to obtain tiny ferritic structure；Back segment is lower using being cooled fast to
Coiling temperature obtains the sufficient bainite structure of phase transformation, reaches duplex structure's target.Using the boiled water slow cooling of leading portion interval, can contract
The short slow cooling section time avoids insufficient using back segment rapid cooling cooling capacity caused by air-cooled slow cooling while cooling using water is spaced apart
The cooling velocity of think gauge steel band can be properly increased, is conducive to refine high-temperature phase-change tissue in this way, while regarding thickness of strips, use
Different rapid cooling inlet temperatures and low coiling temperature, complete medium temperature bainitic transformation sufficiently 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 embodiment of the invention provides a kind of two-phase pipe line steel hot continuous rolling thickness of strips specification；
The embodiment of the invention provides a kind of two-phase pipe line steel hot continuous rolling steel bands, connect 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 component of 2 steel bands 1,2 are as shown in table 1, the steel band
Ingredient includes: C, Si, Mn, P, S, Nb, Cr, Ti, V, Mo, Ni, B, Fe, and impurity is realized by adding suitable alloying element
The intensity and toughness of raising steel band refine crystal grain, improve harden ability, be effectively improved cryogenic property, enhance solid solution strengthening effect, is excellent
Change the technical effect of corrosion resistance.
A kind of 1 chemical component of two-phase pipe line steel hot continuous rolling steel band example 1,2 of the present invention of table, wt%
The embodiment of the invention provides 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 tensile property, low-temperature impact toughness and the low temperature DWTT performance of steel band example 1,2, the steel band
Yield strength Rt0.5 >=510MPa, the low-temperature impact of tensile strength Rm >=610MPa, yield tensile ratio≤0.85, 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 for improving conventional laminar flow cooling equipment
Space has reached and has improved adaptability to changes, high intensity, the technical effect of good low temperature performance.
A kind of 2 tensile property of two-phase pipe line steel hot continuous rolling steel band example 1,2 of the present invention of table
Table 3 the present invention a kind of low-temperature impact toughness and low temperature DWTT performance 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 4 two-phase pipe line steel hot continuous rolling steel band example 1,2 of the present invention of table
DWTT performance
The technical solution provided in the embodiment of the present application, has at least the following technical effects or advantages:
1, the embodiment of the invention provides a kind of two-phase pipe line steel hot continuous rolling steel band, the ingredient percents 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 in 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 procedure is difficult to control, is not easy effectively to control cooling temperature and phase transition process, to cause to be difficult to obtain
Ideal duplex structure, steel band cryogenic property the technical issues of deteriorating, by the content of control addition alloying element, further
Realize the intensity for improving steel and toughness, the technical effect that refines crystal grain, be effectively improved cryogenic property.
2, for the present invention by the matrix of steel band, the matrix of the steel band includes: ferrite and bainite two-phase
Feature.Solve it is in the prior art produced due to steel band in the prior art using hot continuous rolling, mill speed is fast, especially think gauge
Product cooling procedure is difficult to control, and is not easy effectively to control cooling temperature and phase transition process, to cause to be difficult to obtain ideal double
Cryogenic property the technical issues of deteriorating of phase constitution, steel band, realize think gauge hot continuous rolling steel band with ideal duplex structure,
And high tenacity, the technical effect of high intensity.
3, 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.It solves in the prior art since steel band in the prior art uses hot continuous rolling
Production, mill speed is fast, and especially think gauge product cooling procedure is difficult to control, and is not easy effectively to control cooling temperature and phase transformation
Thickness is furthermore achieved to cause to be difficult to obtain ideal duplex structure, the technical issues of cryogenic property of steel band deteriorates in journey
Specification hot continuous rolling steel band improves adaptability to changes, high-intensitive technical effect.
4, the embodiment of the invention provides a kind of its production method of two-phase pipe line steel hot continuous rolling steel band, the method is used
Low S, P content, slab of the thickness in 230~240mm specification, cold conditions shove charge reheating, heating temperature is 1160~1200 DEG C,
The warm time is more than or equal to 35min；Hot tandem is rolled, and last two reduction in pass of roughing: passage second from the bottom is controlled
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 boiled water slow cooling, back segment is quickly cooled down mode.It solves in the prior art raw using hot continuous rolling due to steel band in the prior art
It produces, mill speed is fast, and especially think gauge product cooling procedure is difficult to control, and is not easy effectively to control cooling temperature and phase transformation
It is cold to improve conventional laminar flow to cause to be difficult to obtain ideal duplex structure, the technical issues of cryogenic property of steel band deteriorates for journey
But the regulation space equipped, reaches duplex structure's target, while realizing the skill for improving the cryogenic property of think gauge dual phase steel band
Art effect.
5, the present invention is by finish rolling, and entry temperature at finishing≤920 DEG C, finishing temperature is 740~790 DEG C.It solves existing
Have in technology since steel band in the prior art is produced using hot continuous rolling, mill speed is fast, and especially think gauge product is cooled
Journey is difficult to control, and is not easy effectively to control cooling temperature and phase transition process, to cause to be difficult to obtain ideal duplex structure, steel band
Cryogenic property deteriorate the technical issues of, guarantee sufficiently flatization of austenite grain, at the same realize obtain improved strain product
Technical effect that is tired, laying a solid foundation for refinement phase-change organization.
6, 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
The inlet temperature for stating back segment rapid cooling is controlled at 640~700 DEG C, and oiler temperature control is at 300~450 DEG C.Solve existing skill
Being produced using hot continuous rolling due to steel band in the prior art in art, mill speed is fast, and especially think gauge product cooling procedure is difficult
With control, be not easy effectively to control cooling temperature and phase transition process, thus cause to be difficult to obtain ideal duplex structure, steel band it is low
The technical issues of warm penalty, using different rapid cooling inlet temperatures and low coiling temperature, make medium temperature bainitic transformation compared with
It is sufficiently completed under high cooling condition, obtains tiny ferrite crystal grain and bainite structure, realized and obtain ideal two-phase group
The technical effect knitted.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications can be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, those skilled in the art can carry out various modification and variations without departing from this hair to the embodiment of the present invention
The spirit and scope of bright embodiment.In this way, 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 include these modifications and variations.
Claims (4)
1. a kind of two-phase pipe line steel hot continuous rolling steel band, which is characterized 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；
The matrix of the steel band includes: ferrite and bainite two-phase feature；
Thickness >=16mm of the steel band；
Yield strength Rt0.5 >=510MPa of the steel band, tensile strength Rm >=610MPa, yield tensile ratio≤0.85；
Low-temperature impact ductile-brittle transition temperature≤- 50 DEG C of the steel band, low temperature drop hammer ductile-brittle transition temperature≤- 30 DEG C.
2. a kind of its production method of two-phase pipe line steel hot continuous rolling steel band, which is characterized in that the method uses low S, P content,
Slab of the thickness in 230~240mm specification, cold conditions shove charge reheating, heating temperature is 1160~1200 DEG C, 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；
6~7 passage of finish rolling, mill speed≤1.6m/s, finish rolling end reduction in pass >=10%；
Steel band after rolling uses common section cooling, and the boiled water slow cooling of leading portion interval, back segment are quickly cooled down mode.
3. finish rolling as claimed in claim 2, which is characterized in that entry temperature at finishing≤920 DEG C, finishing temperature 740
~790 DEG C.
4. back segment as claimed in claim 3 is quickly cooled down, which is characterized in that the back segment rapid chilling section cooling manifold number is
4~6 groups, wherein the inlet temperature that the back segment is quickly cooled down is controlled at 640~700 DEG C, and oiler temperature control is 300~450
℃。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710957998.8A CN107746940B (en) | 2017-10-16 | 2017-10-16 | A kind of two-phase pipe line steel hot continuous rolling steel band and its production method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710957998.8A CN107746940B (en) | 2017-10-16 | 2017-10-16 | A kind of two-phase pipe line steel hot continuous rolling steel band and its production method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107746940A CN107746940A (en) | 2018-03-02 |
| CN107746940B true CN107746940B (en) | 2019-07-02 |
Family
ID=61252795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710957998.8A Active CN107746940B (en) | 2017-10-16 | 2017-10-16 | A kind of two-phase pipe line steel hot continuous rolling steel band and its production method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107746940B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105568143A (en) * | 2016-03-15 | 2016-05-11 | 首钢总公司 | Thick pipeline steel hot continuous rolling steel belt easy to coil and excellent in low-temperature performance and manufacturing method thereof |
-
2017
- 2017-10-16 CN CN201710957998.8A patent/CN107746940B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105568143A (en) * | 2016-03-15 | 2016-05-11 | 首钢总公司 | Thick pipeline steel hot continuous rolling steel belt easy to coil and excellent in low-temperature performance and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107746940A (en) | 2018-03-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101985722B (en) | Pipeline steel plate with low yield ratio, fine grains and high strength and production method thereof | |
| CN101613828B (en) | Super-thick steel plate for low yield ratio buildings with 460 MPa grade yield strength and manufacturing method | |
| CN101812635B (en) | Class Q345F steel sheet with thickness of 80mm and manufacturing method thereof | |
| CN107130191B (en) | A kind of air-cooled dual phase steel of ferrite and bainite plate of low yield strength ratio and its production method | |
| CN101864536B (en) | Q 390E class super-thick steel plate with thickness of 100mm and manufacturing method thereof | |
| CN103225047B (en) | The X80 pipeline steel of thickness >=26.5mm and production method thereof | |
| CN102560284B (en) | High-strength high-toughness X100 pipeline steel hot-rolled steel strip and manufacturing method thereof | |
| CN109385576A (en) | A kind of inexpensive X65 pipe line steel and its manufacturing method based on magnesium processing | |
| CN109136482A (en) | Inexpensive yield strength >=960Mpa high intensity cut deal and its production method | |
| CN102041446A (en) | Method for manufacturing Q390E-Z35 low-alloy and high-strength thick plate | |
| CN105039870B (en) | A kind of preparation method of X80M pipe line steel of low temperature resistant big strain and application | |
| CN105112782A (en) | Low-temperature ferrite LT-FH40 steel plate applied to hot-rolled ships and production method thereof | |
| CN112692074A (en) | Hot-rolled thin-specification anti-seismic refractory steel plate with yield strength of 460MPa and preparation method thereof | |
| CN103451520A (en) | Q345 engineering steel and production method thereof | |
| CN110438395A (en) | A kind of 50-80mm thickness AS NZS 3678-350L15Z15-Z35 controlled rolling state structural steel plate and its manufacturing method | |
| CN103320701A (en) | Ferrite bainite advanced high strength steel plate and manufacturing method thereof | |
| CN102220547B (en) | Steel strips used for CT80-grade continuous oil pipe and preparation method thereof | |
| CN109536847A (en) | 390MPa grades of welded tube hot rolled steel plates of yield strength and its manufacturing method | |
| CN103422022B (en) | Large-thickness steel plate for low-temperature structure and production method thereof | |
| CN104018063B (en) | The production method of low-alloy high-strength Q420C medium plates | |
| CN103540850B (en) | The super thick steel for engineering machinery of yield strength >=550MPa and production method | |
| CN103276315A (en) | 900MPa-level ultrahigh-tenacity high-toughness pipeline steel plate and manufacturing method thereof | |
| CN104480384A (en) | Steel plate for 510MPa-grade hydrogen induced cracking resistant pressure vessel and production method of steel plate | |
| CN104073744B (en) | The high tenacity X80 pipe line steel coiled sheet of thickness >=18.5mm and production method | |
| CN103045945B (en) | Economical fabrication method of high-toughness X70 pipeline hot rolled steel plate coil |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |