CN108486464A - 900MPa grades of ferrite base tempering steel plates of yield strength and production method - Google Patents
900MPa grades of ferrite base tempering steel plates of yield strength and production method Download PDFInfo
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- CN108486464A CN108486464A CN201810293804.3A CN201810293804A CN108486464A CN 108486464 A CN108486464 A CN 108486464A CN 201810293804 A CN201810293804 A CN 201810293804A CN 108486464 A CN108486464 A CN 108486464A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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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
- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
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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
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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 yield strength 900MPa grades of ferrite bases tempering steel plate and production methods, and the chemical composition of steel plate is in addition to that in place of C, Si, Mn, P, S, Ti, Mo, Nb, Alt, Ca and N, can add suitable Cr, surplus Fe.It is smelted using the dual refining of ladle+vacuum, cast, continuous casting billet hot-loading and hot-conveying, the charging temperature that continuous casting billet enters heating furnace is more than 400 DEG C, 1230~1280 DEG C of heating temperature in heating furnace, 820~900 DEG C of hot rolling finishing temperature is cooled down after rolling using the rapid cooling more than 25 DEG C/s, 560~640 DEG C of coiling temperature, coil of strip opened through traverse it is flat, open plain plate wide flat steel heat-treatment lines carry out（500~650 DEG C）/（15~50min）Tempering.It opens the production method of flat+steel plate tempering using hot continuous rolling+coil of strip, the microscopic structure of steel is ferrite matrix, and strengthening mechanism is added with precipitation strength based on refined crystalline strengthening, is mild steel, with excellent welding, extend plasticity and processability, is suitable for using on engineering machinery vehicle or automobile.
Description
Technical field
It is that 2.5~7.0mm ferrite bases are tempered steel plate and production the present invention relates to a kind of yield strength 900MPa grades, thickness
Method is a kind of suitable fabrication motor vehicles and machines or automobile steel plate.
Background technology
Advanced high-strength steel is to realize vehicle lightweight, material cost-effective, competitiveness is strong, at present construction machinery industry with
The Major grades of high-strength steel used in automobile commercialization garage industry are 420~960MPa grades of yield strength, wherein 420~700MPa
Grade both can be used hot rolling technology and quenching-and-tempering process production can also be used, and 700MPa grades or more then uses at quenched heat substantially
Manage technique productions.Use of the high strength steel with yield strength of 900 MPa in engineering machinery and Coal Mechanical is increasingly extensive, and gradually
Start to use on automobile commercial car vehicle, main product form and the cut deal that production technology is Tempering and Quenching state produce
Product, using quenching+high tempering technique, i.e., the steel plate produced on heavy and medium plate mill uses quenching+high tempering technique；But
It is hot-strip opening plate or its returning fire plate to have a small amount of 900MPa grade steel plates, using controlled rolling and controlled cooling（TMCP）Or controlled rolling and controlled cooling+
Tempering process produces, and typical microscopic structure is bainite+martensite heterogeneous structure.Separately there is portioned product（Steel plate）, by adopting
With medium high carbon chemical composition or increase the deep process such as cold rolling, thermoforming, can also reach yield strength 900MPa's or more
Rank.
The high-tensile structural steel production technology in forward position is to be designed using low-carbon+Ti, V microalloying ingredients both at home and abroad at present,
It is produced by TMCP or TMCP+ tempering process, microscopic structure type is ferrite base+a large amount of Nano-Scaled Carbides.But mesh
Before to be capable of the maximum intensity rank of steady production be 800MPa grades of yield strength, the advantages of high-strength steel is：1. carbon content and weldering
It is low to connect carbon equivalent, welding performance is excellent；2. improving intensity using Ti, V excellent precipitation enhancement, need not add more expensive
Heavy metal, cost are relatively low；3. matrix is ferritic structure, the plastic height of cold forming, function admirable.But this kind of high-strength steel there is also
Some disadvantages, it is big to be mainly manifested in strength fluctuation, unstable mechanical property；Precipitation hardening effect is strong, while being easy shape
At the irregular islands Ma Ao, toughness is relatively poor；Tiny crystal grain is easy to grow up after welding, and it is higher that strong rate is lost in welding.
Through having looked into ZL201310412998.1（CN103484764B）" Ti precipitation strength type superhigh-strength hots roll thin plate and its life
Production method ", using low-carbon（0.07~0.12wt%）Ti-B combined microalloyings are added to add the ingredient of a certain amount of Ni, Cr, Mo or Cu
Design, the Ti precipitation strength type superhigh-strength hots for obtaining bainite+acicular ferrite type roll volume, open Heisei steel plate using tempering
Technique and thermal straightening obtain the hot rolled sheet that flatness is 2mm/m, Rel >=900MPa and good forming property；Shortcoming
It is that cost is higher, because being added to Ni, Cr, Mo or Cu precious alloy；In addition it is that acicular ferrite structure's class is added using bainite
For type relative to ferritic structure type, cooling after hot rolling is fast, and plate shape is difficult to controlled, and plasticity and formability also want poor.
Patent No. ZL201310111953.X（CN103194676B）" a kind of 1000MPa grades of ferritic steel and its preparation side
Method ", using low-carbon（0.085~0.090wt%）Add Ti microalloyings to add the composition design of Mo, passes through on 350mm duo mills
It controls cold and batches rear 1~2h of isothermal furnace cooling techniques and obtain single ferrite matrix increasing amount carbide particle dispersion-strengtherning
Microscopic structure, the Rel for being prepared for 2~6mm thickness are 900MPa（Rm=1000MPa grades）Hot rolled sheet；Shortcoming is 1. also to locate
In laboratory stage, examined without industrialized production；2. being added to precious alloy Mo（0.37~0.55wt%）Production cost
It is high；3. the technique for batching rear 1~2h of isothermal and furnace cooling lacks similar devices and performance difficulty in most iron and steel enterprises.
Application number CN201510845321.6（CN105463329A）" a kind of 980MPa grades of pure ferrite base hot rolling superelevation is strong
Steel and preparation method thereof ", the carbon in（0.10~0.20wt%）The composition design for adding Ti-V-Mo combined microalloyings, passes through heat
It rolls plus rolls rear rapid cooling technique productions and go out the superhigh-strength hot of 2.5~10.0mm of Rel ＞ 900MPa, Rm ＞ 980MPa and thickness and roll volume,
Product is pure ferrite matrix, ferrite crystal grain（It is average）About 4~5 μm, include a large amount of Nano-Scaled Carbide.It is produced
Carbon content is relatively high in product, and the raising of carbon content can significantly reduce welding performance；In addition, product without tempering process at
Reason, haves the shortcomings that performance inconsistency is big and impact flexibility is relatively low.
Invention content
The purpose of the present invention is to provide a kind of low production cost, comprehensive mechanical property is good, molding makes with welding etc.
With 900MPa grades of the yield strength of superior performance, thickness 2.5~7.0mm ferrite bases be tempered steel plate, while the present invention also provides
The production method of this ferrite base tempering steel plate.
To achieve the above object, the technical solution adopted by the present invention is：A kind of 2.5~7.0mm of thickness of the present invention,
900MPa grades of ferrite bases of yield strength are tempered steel plate, chemical composition（Mass percentage）For：C=0.06~0.12, Si=
0.05~0.30, Mn=1.5~2.0, P≤0.025, S≤0.005, Ti=0.15~0.20, Mo=0.10~0.30, Nb=0.04
~0.07, Alt=0.03~0.06, Ca=0.0010~0.0030, N≤0.006 can also be added as needed on suitable Cr, remaining
Amount is Fe.
The production method of the 900MPa grades of ferrite base tempering steel plates of 2.5~7.0mm of thickness and yield strength, including
Converter or the dual refining → continuous casting of electric furnace smelting → ladle+vacuum → heating stove heat → roughing → finish rolling → ultrafast cold → laminar flow
Cool down → batch → cross section is flat → tempering heat treatment.
Molten steel is smelted using ladle+vacuum Double Refining Process.
Continuous casting billet uses hot-loading and hot-conveying technique, charging temperature when continuous casting billet enters heating furnace to be more than 400 DEG C, and continuous casting billet exists
1230~1280 DEG C of heating temperature in heating furnace.
Hot rolling finishing temperature is controlled at 820~900 DEG C.
Strip is cooled down using the cooling rate more than 25 DEG C/s after rolling；
Oiler temperature control is rolled into hot rolled coil at 560~640 DEG C.
Coil of strip through open it is gentle it is crosscutting after, heat-treatment lines carry out（500~650 DEG C）/（15~50min）Tempering.
Understand that ferrite base described herein is tempered steel plate compared with existing yield strength 900MPa grades of steel, in technique
Traditional Tempering and Quenching route is given up on route, the technique being tempered using TMCP+.Low C+Ti- is used in chemical composition
The design of V-Nb-Mo microalloyings reduces carbon content and welding carbon equivalent.Ultra-fine grained ferrite base is selected in microscopic structure
The organizational form of body+a large amount of Nano-Scaled Carbides, ensure that steel plate has good plasticity.The application absorbs at present both at home and abroad
The production technology of microalloy high strength steel forefront breaches existing 800MPa grades of the limit, realizes 900MPa grades of yield strength
The industrialized production of steel.In addition added steel plate tempering process, improve steel plate impact flexibility and performance uniformity with
Stability utilizes heat-treatment lines production hot continuous rolling yield strength because heat-treatment lines are used for producing cut deal substantially in the application
900MPa grades are opened plain plate, and it is also a big innovation in form to be delivered in product.
900MPa grades of 2.5~7.0mm of thickness, the yield strength ferrite bases provided using technical solution as above are tempered steel plate
Compared with prior art, it has technical effect that：1. production cost reduces.Steel plate need not carry out quenching treatment, save process at
This 200 yuan/t or more；In addition, significantly improving the plate shape lumber recovery of quenching process, a ton steel production cost is reduced；2. resultant force
Learn function admirable.While meeting strength and toughness, the elongation after fracture of steel plate can be maintained at 15% or more, and plasticity is superior.Steel
For plate after tempering heat treatment, the deformation ferrite in course of hot rolling is recrystallized into polygonal ferrite, and Ma Ao resolves into carbon in island
Compound, dislocation density reduce, and insufficient region, which is precipitated, in microalloy element continues to be precipitated, and sufficient region precipitation particles is precipitated
It grows up, these change so that the performance uniformity of steel plate improves, and laterally and longitudinally mechanical property otherness is reduced, performance inconsistency model
It encloses and becomes smaller, stability improves；3. glacing flatness is high.After tempering heat treatment, steel plate internal stress level is low, and glacing flatness is high；4. welding
It is good to connect performance.Steel plate thermal stability specific heat rolled steel plate improves, and the density of Second Phase Precipitation particle is also than hot rolled steel plate higher, favorably
In preventing weld heat-affected zone grain coarsening, improve the mechanical property of welding point, welding performance is more excellent；5. processability
Improve.Steel plate after tempering is pure ferrite matrix, and anisotropic is small, and internal stress level is low, and small, processability is sprung back after molding
It is significantly improved than hot rolled steel plate.
Specific implementation mode
The specific implementation mode of the present invention is described in further detail with reference to embodiment.
Thickness of the present invention is 2.5~7.0mm, 900MPa grade ferrite bases of yield strength are tempered steel plates, it is chemical at
Point（In terms of wt%）C=0.06~0.12, Si=0.05~0.30, Mn=1.5~2.0, P≤0.025, S≤0.005, Ti=0.15~
0.20, Mo=0.10~0.30, Nb=0.04~0.07, Alt=0.03~0.06, Ca=0.010~0.0030, N≤0.006, also
It can be added as needed on suitable Cr, remaining is Fe.Steel plate thickness control is tempered in 2.5~7.0mm.The C, Si, Mn, S, P,
The effect of Ti, Nb and Mo are as follows.
C：It is designed using low carbon content, reduces carbon equivalent with improving welding property.In addition, suitable carbon is solid-solution in ferrite
It matrix and is combined to form second phase particles with microalloy element, plays invigoration effect.
Si：It adds a small amount of silicon and plays solution strengthening effect.
Mn：Intensity can be significantly improved by solution strengthening；Secondly the non-recrystallization temperature of austenite can also be significantly improved,
Fining ferrite grains size.
S：Should be low as possible, such as 30ppm is hereinafter, reduce the formation without the Secondary phase particle of reinforcing effect such as TiS, raising
Effective Ti contents in steel.
P：Should be low as possible, such as 200ppm, hereinafter, phosphorus is crystal boundary segregation element, excessively high phosphorus content can reduce rushing for steel
Hit toughness.
Ti：Very important precipitation strength element, using high Ti（≥0.08wt%）Composition design, by it is alternate precipitation and
The transgranular precipitation mechanism of ferrite forms a large amount of tiny, disperse TiC nanometer particles, significantly improves the intensity of steel.
Nb：Austenite non-recrystallization temperature can be significantly improved, grain refinement effect clearly, while having certain journey
The precipitation strength of degree acts on.It is easy to form the more islands M/A when Nb too high levels, to deteriorate impact flexibility.
Mo：Compound Second Phase Precipitation object can be formed with the carbide of Ti, V, these particles are not easy rapid in tempering
It grows up, there is good anti-temper resistance.
The thickness is 2.5~7.0mm, the production method of 900MPa grades of ferrite bases tempering steel plates of yield strength is as follows.
Using 210t oxygen top bottom blowing converter smeltings.It taps after liquid steel temperature and ingredient reach requirement, steel will be contained
Water ladle send Argon station Argon to handle（BOTTOM ARGON BLOWING）, laggard LF stations and RH stoves refine.Through the dual refining work of ladle+vacuum
Molten steel after skill refining pours into continuous casting billet, thickness of strand 230mm by 2150mm slab casters.Continuous casting billet uses hot charging
Hot sending technique, the charging temperature that continuous casting billet enters heating furnace are more than 400 DEG C, and heating and temperature control of the continuous casting billet in heating furnace exists
1230~1280 DEG C.Continuous casting billet after heating is rolled in 2250mm conventional hot continuous rolling machine production lines, first rolls into continuous casting billet
The intermediate base of 38.0~52.0mm thickness, intermediate base enter 1030~1060 DEG C of the inlet temperature of finishing tandem rolling unit, intermediate base finish rolling
Outlet temperature afterwards is 820~900 DEG C, becomes the steel plate of 2.5~7.0mm thickness after intermediate base finish rolling（That is strip）.After rolling
Steel plate, which uses, is more than 25 DEG C/S（Such as 25~40 DEG C/s）Fast speed of cooling mode be cooled to coiling temperature, the control of coiler plate temperature
At 560~600 DEG C, become coils of hot-rolled steel, it is air-cooled.After steel roll temperature is less than 60 DEG C, coil of strip is opened into flat, steel in high-strength switching line
Wind off it is gentle it is crosscutting after, carried out one by one in wide flat steel heat-treatment lines（500~650 DEG C）/（15~50min）Temper.
The ferrite base obtained through production method as above is tempered steel plate, and microscopic structure is pure ferrite matrix, average crystal grain
Size is 2.5~4.5 μm（Micron）, steel plate flatness can be controlled in 3.0~5.0mm/m.Mechanical property is improved, such as
Rp0.2=920~960MPa.The steel of ferrite base the tempering steel plate and other same intensity ranks（Plate）It compares, laterally surrenders
Intensity（Rp0.2）At least it is higher by 10~70MPa, and transverse tensile strength（Rm）At least it is higher by 10~50MPa.
Embodiment 1
Using 210 tons of converter smeltings, the bottom blowing of Argon station is sent, molten steel is refined through LF stations and RH stoves, in 2150mm slab casters
Pour into continuous casting billet, chemical composition（Wt% is counted）For：C=0.097、Si=0.188、Mn=1.801、P=0.0135、S=0.0025、
Alt=0.0495, Ca=0.0015, Nb=0.052, Ti=0.165, Mo=0.197, N=0.0047, remaining is for Fe and inevitably
Impurity.Thickness of strand is 230mm, is rolled in 2250mm conventional hot continuous rolling machine production lines.Continuous casting billet heats in heating furnace
Temperature is 1260 DEG C, and continuous casting billet rolls into intermediate base, and the entry temperature at finishing that the intermediate base after roughing enters finishing tandem rolling unit is 1042
DEG C, workpiece thickness 39.3mm, intermediate base is 900 DEG C in the finishing temperature of finishing tandem rolling unit, the strip after intermediate base finish rolling
Thickness is 2.5mm.Strip roll after through it is ultrafast cold and ACC layer it is cold be cooled to 600 DEG C of target coiling temperature, be averaged cooling rate 28 DEG C/s,
Coil of strip batches rear air-cooled.In steel roll temperature less than after 60 DEG C, coil of strip is opened flat in high-strength horizontal line of opening, opens plain plate in wide flat steel
Heat-treatment lines carry out 600 DEG C × 20min tempering one by one.
According to 900MPa grades of tempering steel plates of yield strength of above method production, microscopic structure is pure ferrite matrix, separately
Containing a small amount of carbide, crystallite dimension is very tiny, and average grain size is about 2.5 μm, uniform in size.Steel plate flatness can
Within 5mm/m, steel plate internal stress level significantly reduces for control.Gained tempered steel（Plate）With other steel of same intensity rank
（Plate）It compares, yield strength is at least higher by 60MPa, and tensile strength is at least higher by 50MPa, and plasticity index is substantially better than other steel.
In addition, horizontal, longitudinal mechanical property difference is smaller than other hot rolling raw steels, steel plate respectively to performance evenly, it is more stable.
Embodiment 2
Using 210 tons of converter smeltings, the bottom blowing of Argon station is sent, molten steel is refined through LF stations and RH stoves, in 2150mm slab casters
Pour into continuous casting billet, chemical composition（In terms of wt%）For：C=0.097、Si=0.188、Mn=1.801、P=0.0135、S=
0.0025, Alt=0.0495, Ca=0.0015, Nb=0.052, Ti=0.165, Mo=0.197, N=0.0047, remaining is for Fe and not
Evitable impurity.Thickness of strand is 230mm, is rolled in 2250mm conventional hot continuous rolling machine production lines.Continuous casting billet is heating
Heating temperature is 1250 DEG C in stove, and the entry temperature at finishing that the intermediate base after roughing enters finishing tandem rolling unit is 1030 DEG C, intermediate base
Thickness is 44.6mm, and intermediate base is 860 DEG C in the finishing temperature of finishing tandem rolling unit, and the belt steel thickness after intermediate base finish rolling is 5mm,
Strip roll after through it is ultrafast cold and ACC layer it is cold be cooled to 580 DEG C of target coiling temperature, average 32 DEG C/s of cooling rate, sky after coil of strip batches
It is cold.It is flat less than after 60 DEG C, the traverse of coil of strip is carried out out in steel roll temperature, open plain plate wide flat steel heat-treatment lines one by one
Carry out 600 DEG C × 25min tempering.
According to 900MPa grades of tempering steel plates of yield strength of above method production, microscopic structure is pure ferrite matrix, separately
Containing a small amount of carbide, crystallite dimension is very tiny, and average grain size is about 3.0 μm, and size is more uniform.Steel plate is straight
Degree is can be controlled within 3mm/m, and steel plate internal stress level significantly reduces.Gained tempered steel（Plate）It is other with same intensity rank
Steel（Plate）It compares, transverse yield strength is at least higher by 70MPa, and transverse tensile strength is at least higher by about 10MPa, and plasticity index is apparent
Better than other steel.In addition, horizontal, longitudinal mechanical property difference is smaller than other hot rolling raw steels, steel plate is respectively more equal to performance
It is even, it is more stable.
Embodiment 3
Using 210 tons of converter smeltings, the bottom blowing of Argon station is sent, molten steel is refined through LF stations and RH stoves, in 2150mm slab casters
Pour into continuous casting billet, chemical composition（In terms of wt%）For：C=0.097、Si=0.188、Mn=1.801、P=0.0135、S=
0.0025, Alt=0.0495, Ca=0.0015, Nb=0.052, Ti=0.165, Mo=0.197, N=0.0047, remaining is for Fe and not
Evitable impurity.Thickness of strand is 230mm, is rolled in 2250mm conventional hot continuous rolling machine production lines, continuous casting billet is heating
Heating temperature is 1250 DEG C in stove, and the entry temperature at finishing that the intermediate base after roughing enters finishing tandem rolling unit is 1058 DEG C, intermediate base
Thickness is 50.6mm, and intermediate base is 840 DEG C in the finishing temperature of finishing tandem rolling unit, and the belt steel thickness after intermediate base finish rolling is 7mm,
Strip roll after through it is ultrafast cold and ACC layer it is cold be cooled to 560 DEG C of target coiling temperature, average 38 DEG C/s of cooling rate, sky after coil of strip batches
It is cold.In steel roll temperature less than after 60 DEG C, coil of strip is carried out out in traverse it is flat, open plain plate wide flat steel heat-treatment lines one by one
Carry out 600 DEG C × 28min tempering.
According to 900MPa grades of tempering steel plates of yield strength of above method production, microscopic structure is pure ferrite matrix, separately
Containing a small amount of carbide, crystallite dimension is very small, and average grain size is about 4.5 μm, and size is more uniform.Steel plate flatness
It can be controlled within 3mm/n, steel plate internal stress level significantly reduces.Gained is tempered other steel of steel plate and same intensity rank
（Plate）It compares, transverse yield strength is at least higher by 10MPa, and transverse tensile strength is substantially suitable, extends plasticity index and is equal to or excellent
In other steel, -20 DEG C of low-temperature impact toughness are no worse than other steel.Significant advantage is that horizontal, longitudinal mechanical property difference is hotter than it
Roll raw steel and want small, steel plate respectively to performance evenly, it is more stable.
Claims (8)
1. 900MPa grades of ferrite bases of yield strength are tempered steel plate, it is characterised in that：The chemical composition of steel in terms of Wt% C=0.06~
0.12, Si=0.05~0.30, Mn=1.5~2.0, P≤0.025, S≤0.005, Ti=0.15~0.20, Mo=0.10~0.30,
Nb=0.04~0.07, Alt=0.03~0.06, Ca=0.0010~0.0030, N≤0.006, surplus Fe.
2. yield strength 900MPa grades of ferrite bases according to claim 1 are tempered steel plate, it is characterised in that：It is tempered steel plate
In in addition to containing C, Si, Mn, P, S, Ti, Mo, Nb, Alt, Ca and N in place of, can also add Cr.
3. implementing 900MPa grades of ferrite base tempered steel plate producing process of yield strength described in claim 1, it is characterised in that：
Converter smelting, steel ladle bottom argon blowing, LF stations and RH application of vacuum, continuous casting, heating stove heat, continuous casting billet roughing, finishing tandem rolling unit
Finish rolling, ultrafast cold, section cooling, batch, cross section is flat and tempering heat treatment.
4. the production method of yield strength 900MPa grades of ferrite bases tempering steel plate according to claim 3, feature exist
In：Molten steel after steel ladle bottom argon blowing, LF stations and RH application of vacuum is poured into thickness by 2150mm slab casters is
The continuous casting billet of 230mm.
5. the production method of yield strength 900MPa grades of ferrite bases tempering steel plate according to claim 4, feature exist
In：Continuous casting billet uses hot-loading and hot-conveying technique, the charging temperature that continuous casting billet enters heating furnace to be more than 400 DEG C, and continuous casting billet is in heating furnace
In 1230~1280 DEG C of heating temperature.
6. the production method of yield strength 900MPa grades of ferrite bases tempering steel plate according to claim 4 or 5, feature
It is：Continuous casting billet rolls into base among 38.0~52.0mm thickness by roughing mill, and intermediate base enters the inlet temperature of finishing tandem rolling unit
1030~1060 DEG C, 820~900 DEG C of the hot rolling finishing temperature of intermediate base, as 2.5~7.0mm thickness after intermediate base finish rolling
Steel plate.
7. the production method of yield strength 900MPa grades of ferrite bases tempering steel plate according to claim 6, feature exist
In：Steel plate after finish rolling uses the cooling rate more than 25 DEG C/S to carry out rapid cooling to steel plate, is rolled up when steel plate is cooled to 560~600 DEG C
Coil of strip is taken into, hot rolled coil is become.
8. the production method of yield strength 900MPa grades of ferrite bases tempering steel plate according to claim 7, feature exist
In：Coil of strip opened after steel roll temperature is less than 60 DEG C it is gentle crosscutting, wide flat steel heat-treatment lines in 500~650 DEG C of temperature next time
15~50min of fire.
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