CN107058898A - A kind of Q690D low-carbon bainite steels and its production method - Google Patents
A kind of Q690D low-carbon bainite steels and its production method Download PDFInfo
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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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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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
- C21D8/0226—Hot rolling
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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
- C21D8/0242—Flattening; Dressing; Flexing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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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
- C21D2211/002—Bainite
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Abstract
A kind of Q690D low-carbon bainite steels, chemical composition wt%：C 0.06~0.09, Si 0.25~0.35, Mn 1.55~1.70, Cr 0.35~0.45, P≤0.014, S≤0.010, Als 0.025~0.040, Nb 0.050~0.060, Ti 0.010~0.025, Mo 0.15~0.25, surplus is Fe；The rolling process first stage rolls overall reduction 55~70%, treats 2.5~4.0 times of steel plate finished product thicknesses of temperature thickness；Second stage rolls 800~820 DEG C of finishing temperature, after accumulative reduction ratio >=65% after temperature；Control cooling working procedure steel plate opens cold 760~790 DEG C of temperature, 150 DEG C~300 DEG C of final cooling temperature, 15~30 DEG C/s of cooling rate.The present invention can disposably produce qualified Q690D steel grades, and cost is low, and flow is simple.
Description
Technical field
The invention belongs to technical field of metallurgical sheet production, more particularly to a kind of Q690D low-carbon bainite steels and its production
Method.
Background technology
Low-carbon bainite steel is the new steel system developed in recent decades, is described as environment-friendly steel grade, with high intensity,
The features such as high tenacity, excellent welding performance, be widely used in engineering machinery, excavation machinery, heavy-duty car, the bridge of boats, shipbuilding,
The fields such as bridge, naval ship, pressure vessel.Low-carbon is used on its composition, the alloys such as addition Mn, Cr, Mo, Nb, Ti, Ni are combined
Element, obtains uniform tiny bainite structure, to improve steel plate by measures such as dislocation strengthening, refined crystalline strengthening and phase transformation strengthenings
Intensity.Q690D low-carbon bainite steels are mostly produced using modifier treatment or TMCP+ tempering process, will to meet properties of product
Ask, but the method process is more, the production cycle is long, low production efficiency.With the upgrading of rolling equipment, part producer is
The Q690D low-carbon bainite steels of TMCP states are developed, but rolls rear final cooling temperature and is generally 400~500 DEG C, this temperature range steel plate
Just start bainite transformation, if inhomogeneous cooling easily causes occur wooden dipper song after steel plates straightening again；It is reported that template of steel plate
Qualification rate（The qualified steel plate of TMCP state unevenness accounts for the percentage of rolled plate）Only 80% or so, considerably increase the life of steel plate
Produce difficulty.
Chinese patent " a kind of high strength low-temperature-used low carbon bainite steel and its production technology ", number of patent application
200810022600.2, by using the TMCP+ technique productions≤30mm being tempered low-carbon bainite steel, not only complex process,
Steel plate template qualification rate is not referred to yet.
Chinese patent " a kind of 690 grade super strength steel plate for ocean engineering and its production method ", number of patent application
201310291572.5, it is prepared for 690MPa high intensity offshore platform steels, the party by using TMCP, slow cooling, hardening and tempering process
Method is produced complex due to adding retarded cooling process.
Chinese patent " think gauge Q690D high-strength high-toughness steel plates and its production method ", number of patent application
201410221530.9, control cold+hardening and tempering process by using TMCP+ and produce think gauge Q690D high-intensity high-tenacity steel
Plate；This method is in cooling procedure, in order to ensure steel plate integral head, afterbody, edge and plate body temperature are uniform, using 50~
Low-carbon bainite steel thick 80mm, not only complex process, and control is cold using masking and edge-masking end to end, control steel plate returns red
Afterwards bulk temperature it is poor≤50 DEG C, control-cooling equipment is actual to be extremely difficult to above-mentioned requirements, and production difficulty is very big.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of Q690D low-carbon bainite steels and its production method；The hair
Bright use TMCP techniques directly produce the Q690D low-carbon bainite steels of high comprehensive performance, with cost is low, technique simple,
The advantages of template qualification rate is high.
In order to solve the above technical problems, the technical solution adopted in the present invention is：
A kind of Q690D low-carbon bainite steels, the weight/mass percentage composition of chemical composition is respectively：C 0.06~0.09, Si 0.25~
0.35, Mn 1.55~1.70, Cr 0.35~0.45, P≤0.014, S≤0.010, Als 0.025~0.040, Nb 0.050
~0.060, Ti 0.010~0.025, Mo 0.15~0.25, surplus is Fe.
A kind of above-mentioned Q690D low-carbon bainite steels, the weight/mass percentage composition of the chemical composition is preferably：C 0.06~
0.07, Si 0.25~0.30, Mn 1.55~1.65, Cr 0.39~0.41, P 0.010~0.012, S 0.005~0.008,
Als 0.030~0.035, Nb 0.050~0.060, Ti 0.010~0.020, Mo 0.15~0.21, surplus is Fe.
A kind of production method of Q690D low-carbon bainite steels, including smelting molten steel, continuous casting, heating of plate blank, rolling, control it is cold
With aligning process；Weight/mass percentage composition into the continuous casting billet chemical composition of hot-rolled process is：C 0.06~0.09, Si 0.25
~0.35, Mn 1.55~1.70, Cr 0.35~0.45, P≤0.014, S≤0.010, Als 0.025~0.040, Nb
0.050~0.060, Ti 0.010~0.025, Mo 0.15~0.25, surplus is Fe.
A kind of above-mentioned Q690D method for producing low-carbon bainite steel, the rolling process uses two benches temperature-controlled rolling, the
One stage rolling overall reduction is 55%~70%, and it is 2.5~4.0 times of steel plate finished product thicknesses to treat temperature thickness；Second stage is rolled
Finishing temperature be 800~820 DEG C, after after temperature add up reduction ratio >=65%；The control cooling working procedure sets steel plate to open cold temperature
760 DEG C~790 DEG C, final cooling temperature is 150 DEG C~300 DEG C, and cooling rate is 15~30 DEG C/s.
A kind of above-mentioned Q690D method for producing low-carbon bainite steel, the aligning process aligning drafts is 4~7mm, is rectified
Straight speed 0.7~1.0m/s, 7000~16000kN of straightening force.
A kind of above-mentioned Q690D method for producing low-carbon bainite steel, the smelting molten steel process includes converter smelting, LF essences
Refining and RH refinings;LF stoves refining time >=35min, RH application of vacuum time >=30min, below vacuum level requirements 1mbar；Institute
State using permanent pulling rate technique during sheet billet continuous casting, pulling rate is 0.80m/min~0.90m/min；In the heating of plate blank process
One section of temperature range of heating is 950 DEG C~1150 DEG C, and two sections of temperature ranges of heating are 1200 ± 20 DEG C, and soaking zone temperature range is
1150 ± 20 DEG C, slab is 4~5 hours in the heating furnace time.
The present invention is by process above flow, and the Q690D low-carbon bainite steels produced roll rear steel plate yield strength and are more than
700MPa, tensile strength is 780~930MPa, and elongation percentage is 16%~25%, and mechanical property has met or exceeded relevant criterion
It is required that；The present invention not only reduced by only production cost, and simplify production procedure without subsequent heat treatment, it is often more important that,
The Q690D low-carbon bainite steel good plate cuts produced using this method, one time template qualification rate reaches more than 95%.
The advantage of the invention is that：
(1) by smelting reasonable in design, heat, roll, the technological parameter such as cold controlled, using controlled rolling and controlled cooling (TMCP) technique
Qualified Q690D low-carbon bainite steels are disposably produced, without subsequent heat treatment, production cost are not only reduced by only, and
Simplify production procedure.
(2) by using 150~300 DEG C of low temperature cold technique, then impose heavy reduction aligning eventually, make steel plate follow-up without change
Shape, good plate cut, one time template qualification rate reaches more than 95%, far above a template qualification rate of domestic same type 80%.
Theory analysis：High-strength steel is generally controlled cooling to steel plate using cooling control after rolling, and typically controlling cold final cooling temperature is
400~500 DEG C, the structural transformation of ferrite → bainite has just taken place in this temperature range steel plate, and now steel billet temperature is high,
It is easy to leveling, but is due to controlled cooling device that steel plate is cooled into 400~500 DEG C from 800 DEG C, steel plate is with least 80 DEG C of the plate temperature difference
More than, even as high as 100 DEG C, the uneven steel plate of temperature upper cold bed cooling after having rectified, it also occur that ferrite → pearlite/bayesian
Body, in addition martensite phase transformation, phase transformation volume expanded necessarily leads to internal stress, and the compression inside steel plate is met or exceeded
Steel plate will occur wooden dipper song again during the yield strength of steel plate, be commonly called as " secondary wooden dipper is bent ".And the cooling control after rolling that the present invention is used is whole
Cold temperature be 150~300 DEG C, steel plate from finishing temperature with the continuous temperature drop of 15~30 DEG C/S cooling rate to 150~300 DEG C, cooling
Path can produce bainite structure by bainite transformation region, still, and cooling rate does not reach that martensite transfor mation is needed
The cooling rate wanted, thus bainite structure will not be produced；150~300 DEG C of final cooling temperature, bainite structure transformation is basically completed, though
Right steel billet temperature is low, but completely can be with leveling under the effect of strength straightener, the structural transformation that cold bed is produced on steel plate after rectifying
Stress is small, is not enough to reach the yield strength of steel plate, therefore, and steel plate will not be deformed, and one time template qualification rate is significantly lifted.
Embodiment
A kind of Q690D low-carbon bainite steels of the present invention, the weight/mass percentage composition of the Chemical Composition in Cast Billet used for：C
0.06~0.09, Si 0.25~0.35, Mn 1.55~1.70, Cr 0.35~0.45, P≤0.014, S≤0.010, Als
0.025~0.040, Nb 0.050~0.060, Ti 0.010~0.025, Mo 0.15~0.25, surplus is Fe.
A kind of Q690D method for producing low-carbon bainite steel, including smelting molten steel, continuous casting, heating of plate blank, rolling, control it is cold and
Align process；
Smelting molten steel process includes converter smelting, LF refining and RH refinings;LF stoves refining time >=35min, during RH application of vacuum
Between >=30min, below vacuum level requirements 1mbar；
Using permanent pulling rate technique during sheet billet continuous casting, pulling rate is 0.80m/min~0.90m/min；Add in heating of plate blank process
One section of temperature range of heat is 950 DEG C~1150 DEG C, and two sections of temperature ranges of heating are 1200 ± 20 DEG C, and soaking zone temperature range is
1150 ± 20 DEG C, slab is 4~5 hours in the heating furnace time；
Rolling process uses two benches temperature-controlled rolling, and first stage rolling overall reduction is 55%~70%, and it is 2.5 to treat temperature thickness
~4.0 times of steel plate finished product thicknesses；The finishing temperature of second stage rolling is 800~820 DEG C, after accumulative reduction ratio >=65% after temperature；
Control cooling working procedure sets steel plate to open cold temperature for 760 DEG C~790 DEG C, and final cooling temperature is 150 DEG C~300 DEG C, and cooling rate is 15~30 DEG C/
s；
It is 4~7mm to align process aligning drafts, aligns 0.7~1.0m/s of speed, 7000~16000kN of straightening force.
With reference to specific embodiment, the present invention is further detailed explanation.
Embodiment 1~10 is joined by techniques such as On-line Control smelting molten steel, continuous casting, heating of plate blank, rolling, the cold, alignings of control
Number, realizes the content ratio of ferrite and bainite in steel in the range of 0.25~0.55, it is ensured that Q690D intensity meets what is required
Meanwhile, meet the requirement such as user's request template, surface；Specific production process includes：
（1）Converter smelting：Using desulphurised hot metal and low-sulfur steel scrap, scrap ratio is not more than 10%, terminal target：[C]≤0.04%、P
≤0.012%；T=1630 DEG C~1680 DEG C；
（2）LF refining：Refining time >=35min, 1560 DEG C~1600 DEG C of the molten steel reference temperature that enters the station adds lime, aluminium after entering the station
Line, aluminum shot etc. make white slag, rapid slagging；1630 DEG C~1650 DEG C of molten steel out-station temperature, Als=300~500ppm, S after LF processing
≤ 0.005%, other compositions press internally controlling requirement；
（3）RH is refined：RH processing times >=40min, vacuum processing time >=30 minute, the full pump input of processing procedure, vacuum
Below 1mbar, it is ensured that pure degassing time >=6min；Calcium treatment uses calcium line, 100~300m of calcium line feed quantity；Calcium treatment after-blow
The argon time is more than 6 minutes, and liquid steel level is not exposed；Outbound 1570 DEG C~1590 DEG C of reference temperature；
（4）Continuous casting：Tundish selects Ultra-low carbon coverture, and crystallizer selects low-carbon steel protecting slag；Stirring parameter：Electric current
160A, frequency 6Hz；10 DEG C~35 DEG C of the suitable degree of superheat of Metal in Tundish；0.80~0.90m/min of casting machine perseverance pulling rate；Strand heap
Pile temperature retention time is not less than 24 hours；
The chemical composition of casting is as shown in table 1 obtained by each embodiment continuous casting working procedure：
Table 1：Casting chemical composition（wt%）
（5）Heating of plate blank：Each embodiment heating of plate blank technological parameter is as shown in table 2：
Table 2：Heating of plate blank technological parameter
（6）Rolling process：Rolling process required using two benches controlled rollings rolling, first stage rolling overall reduction is 55%~
70%, it is 2.5~4.0 times of steel plate finished product thicknesses to treat temperature thickness；The finishing temperature of second stage rolling is 800~820 DEG C, treats temperature
Add up reduction ratio >=65% afterwards；Each specific technological parameter of embodiment rolling process is shown in Table 3：
Table 3：Hot-rolled process parameter
（7）Control cooling working procedure：It is 760 DEG C~790 DEG C that cooling stage, which sets steel plate to open cold temperature, and final cooling temperature is 150 DEG C~300
DEG C, cooling rate is 15~30 DEG C/S；Specifically control cold technological parameter and be shown in Table 4：
Table 4：Control cold technological parameter
（8）Align process：Steel plate goes out to control the cold rear thermal straightening machine that enters and aligned, aligning drafts 4-7mm, and straightening force 7000~
16000kN, aligning speed 0.7-1.0m/s；Specific straightening process parameter is shown in Table 5：
Table 5：Straightening process parameter
Each embodiment products obtained therefrom mechanical property is shown in Table 6：
Table:6：Product mechanical property
As shown in Table 6, embodiment 1-10 products obtained therefroms are fully able to meet the performance requirement of Q690D low-carbon bainite steels.
Claims (6)
1. a kind of Q690D low-carbon bainite steels, it is characterised in that：The weight/mass percentage composition of its chemical composition is respectively：C 0.06
~0.09, Si 0.25~0.35, Mn 1.55~1.70, Cr 0.35~0.45, P≤0.014, S≤0.010, Als 0.025
~0.040, Nb 0.050~0.060, Ti 0.010~0.025, Mo 0.15~0.25, surplus is Fe.
2. a kind of Q690D low-carbon bainite steels as claimed in claim 1, it is characterised in that：The quality hundred of the chemical composition
Point content is preferably：C 0.06~0.07, Si 0.25~0.30, Mn 1.55~1.65, Cr 0.39~0.41, P 0.010~
0.012, S 0.005~0.008, Als 0.030~0.035, Nb 0.050~0.060, Ti 0.010~0.020, Mo 0.15
~0.21, surplus is Fe.
3. a kind of production method of Q690D low-carbon bainite steels, including smelting molten steel, continuous casting, heating of plate blank, rolling, control it is cold and
Align process；It is characterized in that：Weight/mass percentage composition into the continuous casting billet chemical composition of hot-rolled process is：C 0.06~
0.09, Si 0.25~0.35, Mn 1.55~1.70, Cr 0.35~0.45, P≤0.014, S≤0.010, Als 0.025~
0.040, Nb 0.050~0.060, Ti 0.010~0.025, Mo 0.15~0.25, surplus is Fe.
4. a kind of Q690D method for producing low-carbon bainite steel as claimed in claim 3, it is characterised in that：The rolling process
Using two benches temperature-controlled rolling, first stage rolling overall reduction is 55%~70%, and it is 2.5~4.0 times of steel plates to treat temperature thickness
Finished product thickness；The finishing temperature of second stage rolling is 800~820 DEG C, after accumulative reduction ratio >=65% after temperature；The cold work of control
It is 760 DEG C~790 DEG C that sequence, which sets steel plate to open cold temperature, and final cooling temperature is 150 DEG C~300 DEG C, and cooling rate is 15~30 DEG C/s.
5. a kind of Q690D method for producing low-carbon bainite steel as claimed in claim 4, it is characterised in that：The aligning process
Aligning drafts is 4~7mm, aligns 0.7~1.0m/s of speed, 7000~16000kN of straightening force.
6. a kind of Q690D method for producing low-carbon bainite steel as claimed in claim 5, it is characterised in that：The smelting molten steel
Process includes converter smelting, LF refining and RH refinings;LF stoves refining time >=35min, the RH application of vacuum time >=30min, very
Reciprocal of duty cycle requires below 1mbar；Using permanent pulling rate technique during the sheet billet continuous casting, pulling rate is 0.80m/min~0.90m/
min；It is 950 DEG C~1150 DEG C that one section of temperature range is heated in the heating of plate blank process, and two sections of temperature ranges of heating are 1200
± 20 DEG C, soaking zone temperature range is 1150 ± 20 DEG C, and slab is 4~5 hours in the heating furnace time.
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Cited By (4)
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| CN109550806A (en) * | 2017-09-27 | 2019-04-02 | 鞍钢股份有限公司 | A kind of production method of 500MPa grades of low yield strength ratio bridge steel plate |
| CN109632852A (en) * | 2018-12-14 | 2019-04-16 | 河钢股份有限公司 | A kind of electron microscopic sample preparation method showing bainite structure at fracture surface |
| CN114535310A (en) * | 2022-02-27 | 2022-05-27 | 湖南华菱湘潭钢铁有限公司 | Method for controlling shape of low-carbon bainite steel |
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