CN108300939A - A kind of low cost Q550D high strength steel plates and its production method - Google Patents
A kind of low cost Q550D high strength steel plates and its production method Download PDFInfo
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- CN108300939A CN108300939A CN201810059519.5A CN201810059519A CN108300939A CN 108300939 A CN108300939 A CN 108300939A CN 201810059519 A CN201810059519 A CN 201810059519A CN 108300939 A CN108300939 A CN 108300939A
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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
- C21D8/0221—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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- 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
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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- 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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- 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
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- 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
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- 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
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- 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
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- 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
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- 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
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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- 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
Abstract
The invention discloses a kind of low cost Q550D high-strength steel and its production methods：C：0.03 0.07%, Si：0.20 0.40%, Mn：1.55 1.70%, P：≤ 0.015%, S：≤ 0.003%, Alt：0.02 0.06%, Nb：0.03 0.05%, Ti：0.010 0.025%, V：0.025 0.040%, Cr：0.35 0.50%, Mo：0.10 0.20%, B：0.0010 0.0020%, Ni：≤ 0.30%, Cu：≤ 0.30%, surplus is Fe and inevitable impurity element；Production method includes mainly converter smelting, the refining of LF stoves, continuous casting, rolling, water cooling and temper, pass through controlled rolling and lower final cooling temperature, the tempering process of cooperation proper temperature produces the good 50 80mm think gauges Q550D high-strength steel of intensity, toughness, by adding Cr, Mo, V microalloy element and lower final cooling temperature come proof strength performance, the tempering heat treatment for coordinating proper temperature, improves the impact flexibility of material.50 80mm think gauge Q550D high-strength steel simple process and low costs of this method production, function admirable.
Description
Technical field
The present invention relates to medium plate technical fields, and in particular to a kind of low cost Q550D high strength steel plates and its producer
Method.
Background technology
Q550D is that the yield strength in GB/T1591 and GB/T16270 is not less than 550MPa, it is desirable that -20 DEG C of impact flexibility
Low-alloy high-tensile structural steel, be widely used in all kinds of engineering machinery, coal mine machinery and steel construction.Thickness is less than
The thin specification steel plate of 50mm, is designed using low-carbon-equivalent, with TMCP（Or add-back fire）Technique productions easily reach standard requirement.
But for 50mm or more thick steel plates, TMCP technique productions are such as used, since controlled rolling thinning effect is not as good as Thin Specs steel
Plate and cooling velocity after rolling are not easy to reach control, and toughness can be very unstable.So the Q550D of think gauge substantially take C >=
0.12% composition design, cooperation hardening and tempering process production, leads to high expensive, complex procedures, and be unfavorable for changing for welding performance
It is kind.
Invention content
The purpose of the present invention is being dedicated under the premise of low carbon content, it is thick that 50-80mm is produced by TMCP+ tempering methods
Inexpensive Q550D high strength steel plates and its production method.Make material that there is good welding while ensureing steel plate obdurability
Property index, compared to the technique that produce with hardening and tempering method, with lower production cost.
In order to achieve the above objectives, steel plate chemical Composition Control range of the invention by weight percentage, is：C：0.03-
0.07%, Si：0.20-0.40%, Mn：1.55-1.70%, P：≤ 0.015%, S：≤ 0.003%, Alt：0.02-0.06%, Nb：
0.03-0.05%, Ti：0.010-0.025%, V：0.025-0.040%, Cr：0.35-0.50%, Mo：0.10-0.20%, B：
0.0010-0.0020%, Ni：≤ 0.30%, Cu：≤ 0.30%, PCm=C+ (Mn+ Cr+Cu)/20+Si/30+Mo/15+V/10+
Ni/60+5B：0.16 ~ 0.22%, surplus is Fe and inevitable impurity element, using above ingredient blank production 50-80mm thickness
Steel plate is spent, is included the following steps：
（1）Sotck thinkness is 300 ~ 350mm or more；
（2）Heating：1180-1250 DEG C of soaking temperature, 0.15 ~ 0.20min/mm of control soaking time；
（3）By being rolled using two-phase control rolling method after high-pressure water descaling case de-scaling, the first stage rolls at 980 DEG C or more
Cogging, controls each passage absolute draft amount >=25mm and last two passage single pass are with respect to reduction ratio >=17%, and workpiece thickness t0 is not
Less than 2 times finished product thicknesses；
（4）Second stage is not higher than Tnr-0.45 × t0（mm）It is rolled at a temperature of DEG C, single pass compressive deformation ratio is pressed
10 ~ 20% controls, wherein Tnr=887+464 × C+890 × Ti+363 × Al-357 × Si+6445 × Nb-644 × Nb1/2+(732
×V-230×V1/2；
（5）Start into water cooling after 20 ~ 60S after rolling, and control into coolant-temperature gage >=780 DEG C, red temperature is returned in cooling velocity >=10 DEG C/s
300-450 DEG C of degree；
（6）Stacking slow cooling after steel plate water cooling carries out tempering heat treatment until entering in heat-treatment furnace after room temperature, is tempered holding temperature model
System is contained at 470 ~ 510 DEG C, tempering insulation time is（2.5-3.5）Min × finished steel plate thickness（mm）.
Main alloy element effect of the present invention and range specification are as follows：
C：As interstitial solid solution element, it is remarkably improved the intensity of steel, but to toughness, plasticity, cold formability and weldability
It can be unfavorable.The present invention controls 0.03-0.07%, is to be easier to obtain low-carbon ferrite bainite；Carbon is obtained less than 0.03%
Lath of bainite beamwidth, intensity are insufficient.Carbon is higher than 0.07%, then an interfascicular is easy to carbide precipitate, influences toughness；
Mn：Bainitic steel quenching degree can be improved, while reducing bainite transformation temperature, promotes structure refinement, while can provide
Solution strengthening effect, improves the intensity of steel, and Mn element weight percents content of the present invention is 1.55-1.70%；
Nb：Austenite recrystallization can be significantly inhibited, Unhydrated cement is expanded, is provided to implement Unhydrated cement controlled rolling
Very wide temperature window, Nb element weight percents content of the present invention are 0.03-0.05%；
Cr：The separation that can promote pearlite and bayesian body curve in, significantly moves to right pro-eutectoid ferrite under conditions of low-carbon
Start transformation line with pearlite, while the quenching degree of steel can be improved, improves the mechanical property of steel, Cr elements weight of the present invention
Amount degree is 0.35-0.50%；
Mo：Play the role of postponing pro-eutectoid ferrite phase transformation jointly with B element, promotes the shape of acicular ferrite and bainite
At improving the obdurability of steel, Mo element weight percents content of the present invention is 0.10-0.20%；
V：With very strong precipitation strength effect, especially under tempering process, the strength character of steel can be effectively improved, the present invention
V element weight percent content is 0.025-0.040%；
B：Hardenability of steel can be significantly improved, is the common addition intensified element of high-strength steel, the valuable conjunction such as other Mo can be reduced
Gold dollar cellulose content is present in competence exertion in steel with solid solution condition and acts on.B element weight percent content of the present invention is
0.0010-0.0020%；
Ti：Strong carbonitride-forming elements, it is so that B is existed with solid solution condition in order to fix the N in steel to add it in of the invention
Yu Gangzhong, to inhibit balance change.Ti element weight percents content is 0.010-0.025% in the present invention；
Al：The element of strong deoxidant element and refinement austenite, it is to ensure the element of Ti in steel to add it in of the invention
Recovery rate, the present invention in its weight percent content be calculated as Alt by full aluminium：0.02-0.06%, substantially with other substantial fine grains steel
Unanimously；
PCm：In the present invention, the effective element in steel can add Cu and Ni elements in addition to the above-mentioned element of clear stipulaties.At this
In invention, need to ensure PCm（= C+(Mn+ Cr+Cu)/20+Si/30+Mo/15+V/10+Ni/60+5B）It is arrived 0.16%
0.22%, it is less than 0.16%, then yield strength is easy deficiency, is higher than 0.22%, weldability will be deteriorated.
The reason of main manufacturing processes state modulator of the present invention, is as follows：
The present invention limits sotck thinkness as 300 ~ 350mm or more, is to need thick stock because target steel plate thickness is 50 ~ 80mm
Expect, to obtain enough overall compression ratios, to eliminate steel plate internal flaw, to ensure that entire section densification is uniform, prevent internal in the presence of tight
The lamination defect of weight.
The present invention contain higher Nb Ti the carbides such as V, control soaking temperature at 1180-1250 DEG C,
Soaking time in 0.15-0.20min/mm, be in order to make the precipitated phase of these elements fully be dissolved into austenite so that its
The effect of recrystallization is inhibited to give full play in second stage rolling, the fine grain and substructure tissue to obtain final are prepared.It is low
In selected temperature and time lower limit, solid solution will be insufficient, is higher than selected time and temperature upper limit, then billet oxidization is tight
Weight causes iron scale removal in surface difficult, while also waste of energy.
The present invention after high-pressure water descaling case de-scaling using two-phase control rolling method by being rolled, and the first stage is at 980 DEG C
The above rolling-cogging is it is expected that this stage completes to deform in perfect recrystallization area, obtains uniform original austenite grains.First
Less than 980 DEG C deformations of stage, are easy to generate non-uniform austenite grain, unfavorable to the toughness of final products.
First stage roll control absolute draft >=25mm and two passage single pass are it is expected to exist with respect to reduction ratio >=17%
Effective cooperative transformation can occur for the entire section of this stage steel, so that full face austenite grain is uniform, eliminate simultaneously
Inherent lamination defect in steel.Less than this limit, it is not enough to ensure the necessary even tissue consistency of entire section of steel, to make
Finished product center toughness is bad.
Workpiece thickness t0 is not less than 2 times of finished product thicknesses in the present invention, is to make the Unhydrated cement in second stage
Deflection reaches 50%, and required condition is created for final phase transformation strengthening.Less than this value, the toughness fluctuation of final products is big.
Second stage needs of the present invention are rolled in austenite Unhydrated cement, that is, Tnr or less completely, to obtain deformation Ovshinsky
The body dislocation density as big as possible with accumulation, the difference of intermediate base center portion temperature and surface temperature is about 0.45 × t0 after temperature
（mm）DEG C, therefore control in Tnr-0.45 × t0（mm）The rolling of second stage is carried out at a temperature of DEG C can ensure that tunneling boring exists
The long period does not recrystallize after deformation, to create conditions for final structural state uniformity.Tnr in the present invention=
887+464×C+890×Ti+363×Al-357×Si+6445×Nb-644×Nb1/2+(732×V-230×V1/2。
The single pass compressive deformation ratio of second stage is by 10 ~ 20% controls in the present invention, it is therefore an objective to and entire section is made to assist
With deformation, dislocation integral density reaches unanimity.Less than 10%, the austenite deformation state of interior tissue and the difference on surface are big, high
It in 20%, has portion of tissue and recrystallization occurs to early, influence final structural transformation consistency.
Light plate of the present invention starts after needing air-cooled 20 ~ 60S after rolling into water cooling, is to make deformed austenite that dislocation occur
Relaxation, and nanoscale precipitated phase is precipitated, anchoring dislocation weakens the consistency of crystalline orientation in deformed austenite, and refinement is final
Tissue.It rolls rear air cooling time and is less than 20S, the dislocation degree that relaxes is inadequate, finally organizes coarse, then precipitated phase was precipitated higher than 60S
Amount, it is final to organize toughness that be deteriorated.
It controls into coolant-temperature gage >=780 DEG C, cooling velocity >=10 DEG C/s can inhibit and ferrite is first precipitated, and control in final tissue
Bainite ratio, improve yield strength.Enter coolant-temperature gage less than 780 DEG C and cooling velocity is less than 10 DEG C, yield strength has not
The risk of foot.It is that the bainite structure with excellent toughness, temperature are less than in order to obtain at 300-450 DEG C that red temperature, which is controlled,
300 DEG C, tissue intensity is excessively high, and toughness is bad, and temperature is higher than 450 DEG C, is easy to precipitation flaky carbide after tempering between lath,
Influence toughness.
Stacking slow cooling after steel plate water cooling is to prevent water cooling stress from leading to cracked defect inside steel plate.
At 470 ~ 510 DEG C, tempering insulation time is the tempering holding temperature scope control of steel plate（2.5-3.5）Min × at
Product steel plate thickness（mm）.Holding temperature is tempered less than 470 DEG C and soaking time is less than 2.5min/mm, the toughness of steel plate is insufficient,
Intensity is higher.It is tempered holding temperature and is higher than 510 DEG C, steel plate of the present invention can enter temper brittleness area, and toughness is gradually deteriorated, and tempering is protected
The warm time is higher than 3.5min/mm, then is also easy to toughness fluctuation occur.
The invention difference from existing technology is that the present invention achieves following technique effect：
50-80mm thick steel plates are produced using single tempering heat treatment process, more conventional hardening and tempering process process is simple, cost
It is low.Welding crack sensibility can be greatly lowered simultaneously, ensure the reliability of welding processing and simplify welding procedure.
Description of the drawings
Fig. 1 is the metallograph that state is tempered in the embodiment of the present invention 1；
Fig. 2 is the metallograph that state is tempered in the embodiment of the present invention 4；
Fig. 3 is the metallograph that state is tempered in the embodiment of the present invention 7.
Below in conjunction with attached drawing by example, invention is further described in detail, but following examples are only this hair
Bright example, does not represent rights protection scope defined by the present invention, and the scope of the present invention is wanted with right
It asks subject to book.
Specific implementation mode
Embodiment 1
Rolled plate finished product thickness is 50mm, Q550D high-strength steel, chemical composition（wt%）It is as follows：C：0.053%, Si：
0.289%, Mn：1.66%, P：0.011%, S：0.001%, Alt：0.032%, Nb：0.034%, Ti：0.017%, V：0.029%, Cr：
0.43%, Mo：0.15%, B：0.0016%, Ni：0.013%, Cu：0.017%, Pcm：0.19%, surplus is Fe and inevitable impurity
Element, production technology include converter smelting, the refining of LF stoves, continuous casting, rolling, water cooling and temper process.Smelting molten steel pours
Casting thickness of strand is 300mm, and steel billet enters recuperative heater and is heated to 1210 DEG C, is in soaking zone soaking time
46min is 1050 DEG C into roughing mill start rolling temperature, and through broadening and longitudinal rolling, maximum single pass rolling reduction is 28mm, end two
Passage single pass is 17% and 20% with respect to reduction ratio, and workpiece thickness 140mm, roughing finishing temperature is 1012 DEG C, into essence
Milling train start rolling temperature is 850 DEG C, and effective deformation passage is 6, and single pass compressive deformation ratio is 11 ~ 20%, and finish rolling finishing temperature is
840 DEG C, ACC section coolings are immediately entered after rolling, it is 831 DEG C, 15 DEG C/s of cooling velocity to open cold temperature, and red temperature is
432 DEG C, steel plate after aligning offline stacking slow cooling to room temperature.Subsequent steel plate, which enters, carries out temper in heat-treatment furnace, be tempered
Temperature is 510 DEG C, soaking time 170min, cooled to room temperature in air after coming out of the stove.Under this ingredient and technique, steel plate
Comprehensive mechanical property see the table below shown in 1.
Embodiment 2
Rolled plate finished product thickness is 50mm, Q550D high-strength steel, chemical composition（wt%）It is as follows：C：0.032%, Si：0.22%,
Mn：1.58%, P：0.014%, S：0.003%, Alt：0.045%, Nb：0.032%, Ti：0.012%, V：0.028%, Cr：0.38%,
Mo：0.12%, B：0.0012%, Ni：0.014%, Cu：0.016%, Pcm：0.16%, surplus be Fe and inevitable impurity element,
Its production technology includes converter smelting, the refining of LF stoves, continuous casting, rolling, water cooling and temper process.Smelting molten steel casting continuous casting
Base thickness is 300mm, and steel billet enters recuperative heater and is heated to 1202 DEG C, is 50min in soaking zone soaking time, enters
Roughing mill start rolling temperature is 1070 DEG C, and through broadening and longitudinal rolling, maximum single pass rolling reduction is 26mm, last two passage single pass
Opposite reduction ratio is 16% and 18%, and workpiece thickness 120mm, roughing finishing temperature is 1024 DEG C, into finishing mill open rolling temperature
Degree is 840 DEG C, and effective deformation passage is 6, and single pass compressive deformation ratio is 11 ~ 20%, and finish rolling finishing temperature is 828 DEG C, rolling
After immediately enter ACC section coolings, open cold temperature be 808 DEG C, 15 DEG C/s of cooling velocity, red temperature be 381 DEG C, steel plate
Offline stacking slow cooling is to room temperature after aligning.Subsequent steel plate, which enters, carries out temper in heat-treatment furnace, temperature 500
DEG C, soaking time 130min, cooled to room temperature in air after coming out of the stove.Under this ingredient and technique, steel plate integrates mechanics
Performance see the table below shown in 1.
Embodiment 3
Rolled plate finished product thickness is 50mm, Q550D high-strength steel, chemical composition（wt%）It is as follows：C：0.068%, Si：0.35%,
Mn：1.68%, P：0.012%, S：0.001%, Alt：0.03%, Nb：0.05%, Ti：0.02%, V：0.038%, Cr：0.48%, Mo：
0.20%, B：0.0022%, Ni：0.014%, Cu：0.017%, Pcm：0.22%, surplus is Fe and inevitable impurity element, life
Production. art includes converter smelting, the refining of LF stoves, continuous casting, rolling, water cooling and temper process.Smelting molten steel casting continuous casting billet is thick
Degree is 300mm, and steel billet enters recuperative heater and is heated to 1227 DEG C, is 55min in soaking zone soaking time, into roughing
Machine start rolling temperature is 1091 DEG C, and through broadening and longitudinal rolling, maximum single pass rolling reduction is 26mm, and last two passage single pass are opposite
Reduction ratio is 16% and 18%, and workpiece thickness 105mm, roughing finishing temperature is 1032 DEG C, is into finishing mill start rolling temperature
820 DEG C, effective deformation passage is 6, and single pass compressive deformation ratio is 11 ~ 20%, and finish rolling finishing temperature is 807 DEG C, and rolling terminates
After immediately enter ACC section coolings, open cold temperature be 792 DEG C, 15 DEG C/s of cooling velocity, red temperature be 430 DEG C, steel plate through rectify
Offline stacking slow cooling is to room temperature after straight.Subsequent steel plate, which enters, carries out temper in heat-treatment furnace, temperature is 470 DEG C, is protected
The warm time is 170min, cooled to room temperature in air after coming out of the stove.Under this ingredient and technique, steel plate comprehensive mechanical property is shown in
Shown in the following table 1.
Embodiment 4
Rolled plate finished product thickness is 60mm, Q550D high-strength steel, chemical composition（wt%）It is as follows：C：0.057%, Si：
0.269%, Mn：1.63%, P：0.011%, S：0.002%, Alt：0.022%, Nb：0.04%, Ti：0.016%, V：0.035%, Cr：
0.42%, Mo：0.156%, B：0.0015%, Ni：0.015%, Cu：0.017%, Pcm：0.19%, surplus is Fe and inevitable miscellaneous
Prime element, production technology include converter smelting, the refining of LF stoves, continuous casting, rolling, water cooling and temper process.Smelting molten steel
Casting thickness of strand is 300mm, and steel billet enters recuperative heater and is heated to 1190 DEG C, is in soaking zone soaking time
49min is 1007 DEG C into roughing mill start rolling temperature, and through broadening and longitudinal rolling, maximum single pass rolling reduction is 28mm, end two
Passage single pass is 16% and 18% with respect to reduction ratio, and workpiece thickness 121mm, roughing finishing temperature is 985 DEG C, into finish rolling
Machine start rolling temperature is 825 DEG C, and effective deformation passage is 4, and single pass compressive deformation ratio is 12 ~ 20%, and finish rolling finishing temperature is
810 DEG C, ACC section coolings are immediately entered after rolling, it is 785 DEG C, 14 DEG C/s of cooling velocity to open cold temperature, and red temperature is
375 DEG C, steel plate after aligning offline stacking slow cooling to room temperature.Subsequent steel plate, which enters, carries out temper in heat-treatment furnace, be tempered
Temperature is 480 DEG C, soaking time 150min, cooled to room temperature in air after coming out of the stove.Under this ingredient and technique, steel plate
Comprehensive mechanical property see the table below shown in 1.
Embodiment 5
Rolled plate finished product thickness is 60mm, Q550D high-strength steel, chemical composition（wt%）It is as follows：C：0.032%, Si：0.22%,
Mn：1.58%, P：0.014%, S：0.003%, Alt：0.045%, Nb：0.032%, Ti：0.012%, V：0.028%, Cr：0.38%,
Mo：0.12%, B：0.0012%, Ni：0.014%, Cu：0.016%, Pcm：0.16%, surplus be Fe and inevitable impurity element,
Its production technology includes converter smelting, the refining of LF stoves, continuous casting, rolling, water cooling and temper process.Smelting molten steel casting continuous casting
Base thickness is 300mm, and steel billet enters recuperative heater and is heated to 1241 DEG C, is 48min in soaking zone soaking time, enters
Roughing mill start rolling temperature is 1110 DEG C, and through broadening and longitudinal rolling, maximum single pass rolling reduction is 29mm, last two passage single pass
Opposite reduction ratio is 17% and 20%, and workpiece thickness 135mm, roughing finishing temperature is 1040 DEG C, into finishing mill open rolling temperature
Degree is 847 DEG C, and effective deformation passage is 4, and single pass compressive deformation ratio is 12 ~ 20%, and finish rolling finishing temperature is 834 DEG C, rolling
After immediately enter ACC section coolings, open cold temperature be 821 DEG C, 12 DEG C/s of cooling velocity, red temperature be 416 DEG C, steel plate
Offline stacking slow cooling is to room temperature after aligning.Subsequent steel plate, which enters, carries out temper in heat-treatment furnace, temperature 500
DEG C, soaking time 180min, cooled to room temperature in air after coming out of the stove.Under this ingredient and technique, steel plate integrates mechanics
Performance see the table below shown in 1.
Embodiment 6
Rolled plate finished product thickness is 60mm, Q550D high-strength steel, chemical composition（wt%）It is as follows：C：0.068%, Si：0.35%,
Mn：1.68%, P：0.012%, S：0.001%, Alt：0.03%, Nb：0.05%, Ti：0.02%, V：0.038%, Cr：0.48%, Mo：
0.20%, B：0.0022%, Ni：0.014%, Cu：0.017%, Pcm：0.22%, surplus is Fe and inevitable impurity element, life
Production. art includes converter smelting, the refining of LF stoves, continuous casting, rolling, water cooling and temper process.Smelting molten steel casting continuous casting billet is thick
Degree is 300mm, and steel billet enters recuperative heater and is heated to 1207 DEG C, is 55min in soaking zone soaking time, into roughing
Machine start rolling temperature is 1011 DEG C, and through broadening and longitudinal rolling, maximum single pass rolling reduction is 30mm, and last two passage single pass are opposite
Reduction ratio is 18% and 20%, and workpiece thickness 121mm, roughing finishing temperature is 995 DEG C, is into finishing mill start rolling temperature
830 DEG C, effective deformation passage is 4, and single pass compressive deformation ratio is 12 ~ 20%, and finish rolling finishing temperature is 814 DEG C, and rolling terminates
After immediately enter ACC section coolings, open cold temperature be 803 DEG C, 16 DEG C/s of cooling velocity, red temperature be 372 DEG C, steel plate through rectify
Offline stacking slow cooling is to room temperature after straight.Subsequent steel plate, which enters, carries out temper in heat-treatment furnace, temperature is 510 DEG C, is protected
The warm time is 210min, cooled to room temperature in air after coming out of the stove.Under this ingredient and technique, steel plate comprehensive mechanical property is shown in
Shown in the following table 1.
Embodiment 7
Rolled plate finished product thickness is 80mm, Q550D high-strength steel, chemical composition（wt%）It is as follows：C：0.053%, Si：
0.289%, Mn：1.66%, P：0.011%, S：0.001%, Alt：0.032%, Nb：0.034%, Ti：0.017%, V：0.029%, Cr：
0.43%, Mo：0.15%, B：0.0016%, Ni：0.013%, Cu：0.017%, Pcm：0.19%, surplus is Fe and inevitable impurity
Element, production technology include converter smelting, the refining of LF stoves, continuous casting, rolling, water cooling and temper process.Smelting molten steel pours
Casting thickness of strand is 300mm, and steel billet enters recuperative heater and is heated to 1212 DEG C, is in soaking zone soaking time
46min is 1054 DEG C into roughing mill start rolling temperature, and through broadening and longitudinal rolling, maximum single pass rolling reduction is 26mm, end two
Passage single pass is 17% and 21% with respect to reduction ratio, and workpiece thickness 162mm, roughing finishing temperature is 1002 DEG C, into essence
Milling train start rolling temperature is 845 DEG C, and effective deformation passage is 6, and single pass compressive deformation ratio is 10 ~ 18%, and finish rolling finishing temperature is
837 DEG C, ACC section coolings are immediately entered after rolling, it is 832 DEG C, 11 DEG C/s of cooling velocity to open cold temperature, and red temperature is
368 DEG C, steel plate after aligning offline stacking slow cooling to room temperature.Subsequent steel plate, which enters, carries out temper in heat-treatment furnace, be tempered
Temperature is 505 DEG C, soaking time 200min, cooled to room temperature in air after coming out of the stove.Under this ingredient and technique, steel plate
Comprehensive mechanical property see the table below shown in 1.
Embodiment 8
Rolled plate finished product thickness is 80mm, Q550D high-strength steel, chemical composition（wt%）It is as follows：C：0.032%, Si：0.22%,
Mn：1.58%, P：0.014%, S：0.003%, Alt：0.045%, Nb：0.032%, Ti：0.012%, V：0.028%, Cr：0.38%,
Mo：0.12%, B：0.0012%, Ni：0.014%, Cu：0.016%, Pcm：0.16%, surplus be Fe and inevitable impurity element,
Its production technology includes converter smelting, the refining of LF stoves, continuous casting, rolling, water cooling and temper process.Smelting molten steel casting continuous casting
Base thickness is 300mm, and steel billet enters recuperative heater and is heated to 1211 DEG C, is 56min in soaking zone soaking time, enters
Roughing mill start rolling temperature is 1024 DEG C, and through broadening and longitudinal rolling, maximum single pass rolling reduction is 28mm, last two passage single pass
Opposite reduction ratio is 17% and 19%, and workpiece thickness 165mm, roughing finishing temperature is 987 DEG C, into finishing mill start rolling temperature
It it is 827 DEG C, effective deformation passage is 6, and single pass compressive deformation ratio is 10 ~ 18%, and finish rolling finishing temperature is 803 DEG C, rolling knot
ACC section coolings are immediately entered after beam, it is 796 DEG C, 13 DEG C/s of cooling velocity to open cold temperature, and red temperature is 369 DEG C, steel plate warp
Offline stacking slow cooling is to room temperature after aligning.Subsequent steel plate, which enters, carries out temper in heat-treatment furnace, temperature is 480 DEG C,
Soaking time is 280min, cooled to room temperature in air after coming out of the stove.Under this ingredient and technique, steel plate comprehensive mechanical property
It see the table below shown in 1.
Embodiment 9
Rolled plate finished product thickness is 80mm, Q550D high-strength steel, chemical composition（wt%）It is as follows：C：0.068%, Si：0.35%,
Mn：1.68%, P：0.012%, S：0.001%, Alt：0.03%, Nb：0.05%, Ti：0.02%, V：0.038%, Cr：0.48%, Mo：
0.20%, B：0.0022%, Ni：0.014%, Cu：0.017%, Pcm：0.22%, surplus is Fe and inevitable impurity element, life
Production. art includes converter smelting, the refining of LF stoves, continuous casting, rolling, water cooling and temper process.Smelting molten steel casting continuous casting billet is thick
Degree is 300mm, and steel billet enters recuperative heater and is heated to 1216 DEG C, is 55min in soaking zone soaking time, into roughing
Machine start rolling temperature is 1007 DEG C, and through broadening and longitudinal rolling, maximum single pass rolling reduction is 29mm, and last two passage single pass are opposite
Reduction ratio is 17% and 20%, and workpiece thickness 165mm, roughing finishing temperature is 986 DEG C, is into finishing mill start rolling temperature
840 DEG C, effective deformation passage is 6, and single pass compressive deformation ratio is 10 ~ 18%, and finish rolling finishing temperature is 829 DEG C, and rolling terminates
After immediately enter ACC section coolings, open cold temperature be 814 DEG C, 17 DEG C/s of cooling velocity, red temperature be 440 DEG C, steel plate through rectify
Offline stacking slow cooling is to room temperature after straight.Subsequent steel plate, which enters, carries out temper in heat-treatment furnace, temperature is 500 DEG C, is protected
The warm time is 240min, cooled to room temperature in air after coming out of the stove.Under this ingredient and technique, steel plate comprehensive mechanical property is shown in
Shown in the following table 1.
1 steel plate comprehensive mechanical property of table
Claims (2)
1. a kind of low cost Q550D high strength steel plates, it is characterised in that：Chemical component weight percentage meter, C：0.03-0.07%,
Si：0.20-0.40%, Mn：1.55-1.70%, P：≤ 0.015%, S：≤ 0.003%, Alt：0.02-0.05%, Nb：0.03-
0.05%, Ti：0.010-0.025%, V：0.025-0.040%, Cr：0.35-0.50%, Mo：0.10-0.20%, B：0.0010-
0.0020%, Ni：≤ 0.30%, Cu：≤ 0.30%, PCm=C+ (Mn+ Cr+Cu)/20+Si/30+Mo/15+V/10+Ni/60+
5B：0.16 ~ 0.22%, surplus is Fe and inevitable impurity element.
2. a kind of production method of low cost Q550D high strength steel plates, it is characterised in that：Chemical component weight percentage meter, C：
0.03-0.07%, Si：0.20-0.40%, Mn：1.55-1.70%, P：≤ 0.015%, S：≤ 0.003%, Alt：0.02-0.05%,
Nb：0.03-0.05%, Ti：0.010-0.025%, V：0.025-0.040%, Cr：0.35-0.50%, Mo：0.10-0.20%, B：
0.0010-0.0020%, Ni：≤ 0.30%, Cu：≤ 0.30%, PCm=C+ (Mn+ Cr+Cu)/20+Si/30+Mo/15+V/10+
Ni/60+5B：0.16 ~ 0.22%, surplus is Fe and inevitable impurity element；300 ~ 350mm thickness strands of mentioned component add
Heat arrives 1180-1250 DEG C, controls 0.15 ~ 0.20min/mm of soaking time, by using two benches after high-pressure water descaling case de-scaling
Rolling is rolled, and the wherein first stage in 980 DEG C of above rolling-coggings of temperature, controls each passage absolute draft amount >=25mm
And last two passage single pass, with respect to reduction ratio >=17%, workpiece thickness t0 is not less than 2 times of finished product thicknesses；Second stage is not high
In Tnr-0.45 × t0（mm）It is rolled at a temperature of DEG C（Tnr=887+464×C+890×Ti+363×Al-357×Si+
6445×Nb-644×Nb1/2+(732×V-230×V1/2), single pass compressive deformation ratio is by 10 ~ 20% controls, 20 ~ 60S after rolling
After start into water cooling, and control into coolant-temperature gage >=780 DEG C, cooling velocity >=10 DEG C/s, 300-450 DEG C of red temperature；After rolling
After steel plate stacking slow cooling to room temperature, tempering heat treatment is carried out, tempering holding temperature scope control is at 470 ~ 510 DEG C, tempering heat preservation
Time is（2.5-3.5）Min × finished product 50-80mm steel plates.
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| CN109136482A (en) * | 2018-10-16 | 2019-01-04 | 五矿营口中板有限责任公司 | Inexpensive yield strength >=960Mpa high intensity cut deal and its production method |
| CN113957336A (en) * | 2021-09-14 | 2022-01-21 | 包头钢铁（集团）有限责任公司 | Production method of low-cost high-toughness Q460qNHD steel plate |
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| CN109136482A (en) * | 2018-10-16 | 2019-01-04 | 五矿营口中板有限责任公司 | Inexpensive yield strength >=960Mpa high intensity cut deal and its production method |
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| CN115029633A (en) * | 2022-06-21 | 2022-09-09 | 湖南华菱湘潭钢铁有限公司 | Multi-process adaptive Q550 medium-thickness steel plate and production method thereof |
| CN115074643A (en) * | 2022-06-21 | 2022-09-20 | 湖南华菱湘潭钢铁有限公司 | Multi-process adaptive Q690 medium-thickness steel plate and production method thereof |
| CN115198192A (en) * | 2022-07-28 | 2022-10-18 | 湖南华菱湘潭钢铁有限公司 | Production method of low-yield-ratio high-toughness Q690GJ steel plate |
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| CN115710672A (en) * | 2022-10-28 | 2023-02-24 | 武安市裕华钢铁有限公司 | Microalloyed high-strength steel plate capable of avoiding layering defect and production process thereof |
| CN116043104A (en) * | 2022-10-28 | 2023-05-02 | 南阳汉冶特钢有限公司 | Low-cost Q550D steel produced by TMCP (thermal mechanical control process) technology and production method thereof |
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Application publication date: 20180720 |