CN106399830A - High hole expanding steel with stable hole expanding performance and production method thereof - Google Patents
High hole expanding steel with stable hole expanding performance and production method thereof Download PDFInfo
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- CN106399830A CN106399830A CN201610898760.8A CN201610898760A CN106399830A CN 106399830 A CN106399830 A CN 106399830A CN 201610898760 A CN201610898760 A CN 201610898760A CN 106399830 A CN106399830 A CN 106399830A
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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
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
Abstract
The invention discloses high hole expanding steel with stable hole expanding performance and a production method thereof, and belongs to the technical field of automobile steel. The high hole expanding steel provided by the invention comprises the following chemical components in percentage by mass: 0.06 to 0.10 percent of C, 0.10 to 0.25 percent of Si, 1.40 to 1.60 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, 0.03 to 0.049 percent of Nb, and the balance of Fe and unavoidable impurities. The key process of the production method disclosed by the invention comprises the following steps: performing a casting blank heating process to obtain casting blanks with the short blank lengths of 4 to 8 m; adopting a quasi-constant speed rolling process in a rolling process, wherein the steel rolling acceleration is less than or equal to 0.007 m/s<2>; adopting two-stage cooling , wherein the first-stage cooling is a super fast cooling process, the water cooling speed is 80 to 220 DEG C/s, the second-stage cooling is an intensified cooling process, and the water cooling speed is 40 to 140 DEG C/s; adopting side spraying after the first-stage cooling, and allocating a fan, wherein an air cooling section is arranged between the first-stage cooling and the second-stage cooling, and a temperature measuring point of the air cooling section moves between the positions 30 to 40 m away from an F7 rolling machine. The hole expansion rate of a prepared steel coil is 98 percent or above; the hole expansion rate volatility at the head part, the middle part and the tail part of the same steel coil is 5 percent or below.
Description
Technical field
The present invention relates to automobile steel technical field, the high reaming steel more particularly to a kind of reaming stable performance and its life
Product method.
Background technology
With the fast development of auto industry, the impact of motor vehicle emission environmental pollution becomes increasingly conspicuous, and energy-saving and emission-reduction are carved not
Rong Huan, automotive light weight technology is the effective means of automotive energy-saving emission-reducing.As the part of high-speed rotation, its lightweight energy-conservation is wheel
1.5 times of other parts about, effect is especially pronounced.The parts such as automotive wheel, chassis due to the shaping of its complexity, flange,
Reaming operation and require material have high become performance, high flange performance.Domestic passenger car steel wheel, chassis structure part master at present
Low-alloy high-strength steel to be used, wherein wheel spoke part part use ferrite/martensite dual phase steel (DP steel), in actual production
Because the reaming performance of low-alloy high-strength steel and DP steel is relatively low, therefore often cracking in reaming overturning process, impact produces
Efficiency and lumber recovery, and, if undiscovered fine cracks are existed on wheel, serious safety can be caused hidden vehicle traveling
Suffer from.
Compared with traditional material low-alloy high-strength steel, DP steel, hot-rolled ferrite-bainite steel (FB steel) have high intensity and
Good cold formability, good reaming, welding and fatigue behaviour, are that the part hot rolling such as automotive wheel and chassis structure part is high-strength
The ideal material of degree steel plate.
As Chinese invention patent (Authorization Notice No.：CN103526116B, authorized announcement date：2015-07-08) disclose topic
There is the Ferrite bainitic steel of high reaming performance and its Chinese patent literature of production method for tensile strength 590MPa level.Should
The chemical composition percentage of steel is：C：0.05～0.10%, Si：0.10～0.50%, Mn：0.80～1.50%,
P：0.03～0.06%, S≤0.008%, Cr：0.20～0.60%, Nb：0.03～0.06%, Al：0.01～0.06%, remaining
Measure as Fe and inevitable impurity.The production method of this steel includes converter smelting, application of vacuum, continuous casting, heating strand, thick
Roll, finish rolling, the step cooling down, batching.It was verified that the reaming flange performance of this steel, stamping formabilily and welding performance are excellent
Good, can be suitably used for the structural members such as automotive wheel, chassis, meanwhile, its production method technological process is simple, with low cost.Shortcoming is
Due in actual production process, to ensure strip steel temperature homogeneity end to end, generally adopt increasing speed rolling technology, the rolling of strip steel
Speed processed is more and more faster, and it can accordingly shorten in the time of water-cooled section, causes cooling not, that is, the temperature fluctuation batched is big, from
And cause the performance inconsistency including reaming performance larger.Additionally, air cooling section measurement temperature is by cooling down that surface of steel plate remains
Water and the impact of water smoke, the certainty of measurement of air cooling section steel plate temperature is not high, can bring detrimental effect to technique execution.
Content of the invention
Object of the present invention is to provide a kind of high reaming steel of reaming stable performance and its production method.This producer
Method adopts relatively low niobium alloy content, and preferably 6～8 meters of short base carries out quasi- constant speed rolling, cooling procedure is controlled simultaneously,
Prepare hole expandability rate high, and the coil of strip of reaming stable performance.
For achieving the above object, the invention discloses a kind of high reaming steel chemical composition of reaming stable performance presses quality hundred
Fraction is calculated as：
C：0.06～0.10%, Si：0.10～0.25%, Mn：1.40～1.60%, P≤0.015%, S≤0.010%,
Nb：0.015～0.049%, balance of Fe and inevitable impurity.
Further, chemical composition is by mass percentage：
C：0.06～0.10%, Si：0.10～0.25%, Mn：1.40～1.60%, P≤0.015%, S≤0.010%,
Nb：0.015～0.025%, balance of Fe and inevitable impurity.
Yet further, the hole expansibility of described high reaming steel is more than or equal to 98%, and is less than or equal to 105%, high expansion
Undulatory property≤5% of afterbody position hole expansibility in the steel toe of hole.
Further, yield strength R of described high reaming steeleL>=460MPa, tensile strength RmFor 580～700MPa,
In elongation percentage A >=21%, and high reaming steel toe, the Mechanical Fluctuation of afterbody position is between 20Mpa.
The invention also discloses a kind of production method of the high reaming steel of reaming stable performance, including converter smelting, vacuum
Process, continuous casting, heating strand, roughing, finish rolling, the step cooling down, batching, it is characterized in that：Critical process process is as follows：
Heating strand technical process, the strand obtaining is short base, and the length of short base is 4～8m；
Roughing and finish-rolling process process, using quasi- constant speed rolling technique, steel rolling acceleration≤0.007m/s2；
Cooling technique process, using two-stage cooling, the water-cooled cooling rate of first paragraph cooling is 80～220 DEG C/s, second segment
The water-cooled cooling rate of cooling is 40～140 DEG C/s；And be air cooling section between first paragraph cooling and second segment cooling, air cooling section point for measuring temperature
Move between 30～40m apart from F7 milling train.
Further, adopt side spray after first paragraph cooling, and be equipped with blower fan.
Yet further, heating strand technical process, heating-up temperature is 1220～1260 DEG C, and the strand obtaining is short base,
The length of short base is 6～8m；
Roughing and finish-rolling process process, using quasi- constant speed rolling technique, steel rolling acceleration≤0.005m/s2；
Cooling technique process, using two-stage cooling, first paragraph is cooled to ultrafast cooling technique, water-cooled cooling rate be 100～
200 DEG C/s, second segment is cooled to encrypt cooling technique, and water-cooled cooling rate is 60～120 DEG C/s.
Yet further, adopt side spray after first paragraph cooling, and be equipped with blower fan.
Further, the started temperature of air cooling section is 680～740 DEG C, and air cooling time is 8～12s.
Further, roughing technical process, 1080～1120 DEG C of the outlet temperature of roughing；
Finish-rolling process process, the steel billet before finish rolling adopts thermal insulation cover isothermal holding, 820～860 DEG C of the finishing temperature of finish rolling；
Coiling technique process, oiler temperature control is between 400～450 DEG C.
The principle of the present invention：
1st, the selection principle of various chemical compositions：
Carbon (C)：It is solution strengthening element the most cheap, the volume fraction of bainite and phosphorus content in impact FB steel, thus
The intensity of FB steel is had a major impact.If its content is less than 0.06%, the requirement of the strength of materials can not be met, if over
The raising of carbon content, then press formability and weldability can reduce, using compared with low carbon content therefore on the premise of proof strength,
So, its content is limited to 0.06～0.10% scope.
Silicon (Si)：Steel strength can be improved by solution strengthening, may also suppress the precipitation of carbide, it is to avoid pearly-lustre body phase
Appearance.If its content is less than 0.10%, its effect can not be played；If its content is more than 0.25%, heat can be deteriorated
The surface quality of rolled steel plate and welding performance, so, its content is limited between 0.10～0.25%.
Manganese (Mn)：It is effective solution strengthening and promotion bainite generation element, in order to play its effect it is necessary to add
More than 0.8%.But add the manganese of volume, the plasticity of steel can be led to decline, therefore on the premise of proof strength, reduce Mn's
Addition, so Mn content is limited to 0.8～2.0% scope, preferably 1.40～1.60%.
Phosphorus (P)：It is good solution strengthening element, the quenching degree of steel can be improved, be conducive to obtaining the relatively thin bayesian of lamella
Body phase, but when P addition is higher than 0.03%, easily effectively causes stamping formabilily due to segregation, toughness, suitability for secondary processing are sent out
Raw deterioration, therefore, P content is limited to less than 0.03, preferably less than 0.015%.
Sulfur (S)：It is very harmful element, the sulfur in steel is often existed with the oxide morphology of manganese, this sulphide inculsion
Impact flexibility to steel is very unfavorable, and causes the anisotropy of performance, therefore, need to control lower by sulfur content in steel
Better.Based on the consideration to Steel Sheet technique Manufacturing cost, plan sulfur content in steel and control below 0.010%.
Niobium (Nb)：It is very effective crystal grain thinning, improve intensity and toughness element.Can be after suppressing rolling deformation
Recrystallization the growing up of austenite crystal, obtain the tissue such as tiny ferrite of crystal grain after cooling, improve intensity and the toughness of steel.
In addition the NbC separating out, is conducive to the raising of steel strength.When Nb content is less than 0.015%, NbC separates out not enough it is difficult to reach this
The intensity that invention requires, strengthens effect close to saturation, and cost of alloy raises when content is higher than 0.049%.Therefore by Nb unit
The content of element is limited to 0.015～0.049%, preferably 0.015～0.025%.
2nd, the operation principle of production method of the present invention：
(1) present invention employs relatively low niobium element content, make full use of the fine grain effect of niobium and the tissue of high reaming steel
Strengthening effect, the coiling temperature due to high reaming steel is 400～450 DEG C, and this is the temperature range that bainite is formed, but at this
Under temperature range, the effect of Second Phase Precipitation strengthening is very weak, therefore reduces niobium element content, makes full use of build up, i.e. profit
Improve intensity with the amount of bainite.
(2) during in order to ensure two stage type cooling technique, the stability of tail temperature in the middle part of steel coil head, final guarantee
The stablizing of entire volume reaming performance, adopts " short base+quasi- constant speed rolling " pattern, the purpose of quasi- constant speed rolling exactly by acceleration set to
Minimum, to realize constant speed rolling, short base can ensure that the temperature drop of coil of strip afterbody is little under quasi- constant speed rolling pattern, thus reaching liter
Speed rolling technique identical effect；And quasi- constant speed rolling pattern it is ensured that time when by section cooling for the strip steel equal, this
Sample cooling effect is identical, and technique shoots straight.
(3) in order to ensure the measurement accuracy of air cooling section temperature, air cooling section adopts blower fan and side spray, and side spray is to remove
Surface of steel plate water stain, blower fan is to purge aqueous vapor, simultaneously measurement air cooling section temperature temperature-measuring gun be moveable, thus
Thermometric in the middle part of air cooling section, allow surface of steel plate and middle portion temperature uniform after measure again, make temperature more representative, Er Qieyuan
From first paragraph water-cooled, the side spray water nozzle of configuration and blower fan after water-cooled, equally can reduce surface of steel plate residual cooling water and steam
Adverse effect to measurement result.
(4) adopt ultrafast cool equipment so that the cooling rate of first paragraph water-cooled is up to 100～200 DEG C/s, carry after such finish rolling
The internal substantial amounts of deformation band of crystalline grain of steel is retained, and many at forming core in phase transition process, fetrite grain refinement after phase transformation, such
Under high cooling rate, the first paragraph water-cooled time is only 1.0～1.5s, so in the limited length of section cooling section, to air cooling section
Reserve enough air cooling times.And second segment water-cooled, using encryption cooling, also can make cooling rate be up to 60～120 DEG C/s, thus
The formation that pearlite can be avoided is interval, makes the austenite not changed be completely reformed into bainite.
Beneficial effect：
Using the coil of strip of the production method preparation of the present invention, reaming stable performance, make the expansion of afterbody in the middle part of the head of coil of strip
Porosity has reached the hole expansibility undulatory property of afterbody in the middle part of more than 98%, and the head of same coil of strip below 5%, obtains coil of strip
Yield strength ReL>=460MPa, tensile strength RmFor 580～700MPa, afterbody in elongation percentage A >=21%, and high reaming steel toe
The Mechanical Fluctuation of position is between 20Mpa.The high reaming steel of therefore present invention preparation is applied to high to material performance requirement
The production of the parts such as automotive wheel, chassis.
Brief description
Fig. 1 is the structure organization chartss of the coil of strip afterbody of embodiment 1 preparation；
The structure organization chartss of the coil of strip afterbody that Fig. 2 is prepared for comparative example；
The scanning electron microscope schematic diagram of the coil of strip afterbody reaming sample that Fig. 3 is prepared for comparative example.
Specific embodiment
In order to preferably explain the present invention, it is further elucidated with the main contents of the present invention below in conjunction with specific embodiment, but
The content of invention is not limited solely to following examples.
Embodiment 1
The present embodiment prepares the high reaming steel of reaming stable performance, and chemical composition is by mass percentage：
C：0.06%th, Si：0.10%th, Mn：1.40%th, P：0.015%th, S：0.010%th, Nb：0.03%, balance of Fe and
Inevitably impurity.
The production method of the high reaming steel of the reaming stable performance of the present embodiment, including converter smelting, application of vacuum, company
Casting, heating strand, roughing, finish rolling, the step cooling down, batching, wherein, critical process procedure parameter is as follows：
Slab heating temperature is 1220 DEG C, and the strand obtaining is short base, and the length of short base is 6.1m；
1080 DEG C of the outlet temperature of roughing, the steel billet before finish rolling adopts thermal insulation cover isothermal holding, the finishing temperature 820 of finish rolling
℃；In the rolling process of roughing and finish rolling, steel rolling is rolled using quasi- constant speed technique, and the acceleration of steel rolling is
0.005m/s2.
In two-stage cooling, first paragraph is cooled to ultrafast cooling technique, and water-cooled cooling rate is 110 DEG C/s, and second segment is cooled to
Encryption cooling technique, water-cooled cooling rate is 120 DEG C/s；There is air cooling section between first paragraph cooling and second segment cooling, using joining
Blower fan, and the mode of side spray carries out air cooling, 740 DEG C of the started temperature of air cooling, air cooling time 12s；The instrument of measurement air cooling section temperature
Device can 30 meters of movements after the 7th milling train；
Oiler temperature control is between 430～450 DEG C.
The performance of the high reaming steel that the present embodiment prepares is as shown in table 1.
Embodiment 2
The present embodiment prepares the high reaming steel of reaming stable performance, and chemical composition is by mass percentage：
C：0.10%th, Si：0.25%th, Mn：1.60%th, P：0.010%th, S：0.008%th, Nb：0.049%, balance of Fe
And inevitable impurity.
The production method of the high reaming steel of the reaming stable performance of the present embodiment, including converter smelting, application of vacuum, company
Casting, heating strand, roughing, finish rolling, the step cooling down, batching, wherein, critical process procedure parameter is as follows：
Slab heating temperature is 1260 DEG C, and the strand obtaining is short base, and the length of short base is 6.8m；
1100 DEG C of the outlet temperature of roughing, the steel billet before finish rolling adopts thermal insulation cover isothermal holding, the finishing temperature 840 of finish rolling
℃；In the rolling process of roughing and finish rolling, steel rolling is rolled using quasi- constant speed technique, and the acceleration of steel rolling is
0.003m/s2.
In two-stage cooling, first paragraph is cooled to ultrafast cooling technique, and water-cooled cooling rate is 130 DEG C/s, and second segment is cooled to
Encryption cooling technique, water-cooled cooling rate is 100 DEG C/s；There is air cooling section between first paragraph cooling and second segment cooling, using joining
Blower fan, and the mode of side spray carries out air cooling, 720 DEG C of the started temperature of air cooling, air cooling time 10s；The instrument of measurement air cooling section temperature
Device can 35 meters of movements after the 7th milling train；
Oiler temperature control is between 400～410 DEG C.
The performance of the high reaming steel that the present embodiment prepares is as shown in table 1.
Embodiment 3
The present embodiment prepares the high reaming steel of reaming stable performance, and chemical composition is by mass percentage：
C：0.07%th, Si：0.15%th, Mn：1.50%th, P：0.008%th, S：0.005%th, Nb：0.015%, balance of Fe
And inevitable impurity.
The production method of the high reaming steel of the reaming stable performance of the present embodiment, including converter smelting, application of vacuum, company
Casting, heating strand, roughing, finish rolling, the step cooling down, batching, wherein, critical process procedure parameter is as follows：
Slab heating temperature is 1240 DEG C, and the strand obtaining is short base, and the length of short base is 7.5m；
1100 DEG C of the outlet temperature of roughing, the steel billet before finish rolling adopts thermal insulation cover isothermal holding, the finishing temperature 840 of finish rolling
℃；In the rolling process of roughing and finish rolling, steel rolling is rolled using quasi- constant speed technique, and the acceleration of steel rolling is
0.002m/s2.
In two-stage cooling, first paragraph is cooled to ultrafast cooling technique, and water-cooled cooling rate is 150 DEG C/s, and second segment is cooled to
Encryption cooling technique, water-cooled cooling rate is 80 DEG C/s；There is air cooling section between first paragraph cooling and second segment cooling, using air distribution
Machine, and the mode of side spray carries out air cooling, 700 DEG C of the started temperature of air cooling, air cooling time 9s；The instrument of measurement air cooling section temperature can
With 35 meters of movements after the 7th milling train；
Oiler temperature control is between 420～440 DEG C.
The performance of the high reaming steel that the present embodiment prepares is as shown in table 1.
Embodiment 4
The present embodiment prepares the high reaming steel of reaming stable performance, and chemical composition is by mass percentage：
C：0.09%th, Si：0.20%th, Mn：1.50%th, P：0.005%th, S：0.005%th, Nb：0.025%, balance of Fe
And inevitable impurity.
The production method of the high reaming steel of the reaming stable performance of the present embodiment, including converter smelting, application of vacuum, company
Casting, heating strand, roughing, finish rolling, the step cooling down, batching, wherein, critical process procedure parameter is as follows：
Slab heating temperature is 1250 DEG C, and the strand obtaining is short base, and the length of short base is 8.0m；
1120 DEG C of the outlet temperature of roughing, the steel billet before finish rolling adopts thermal insulation cover isothermal holding, the finishing temperature 850 of finish rolling
℃；In the rolling process of roughing and finish rolling, steel rolling is rolled using quasi- constant speed technique, and the acceleration of steel rolling is
0.001m/s2.
In two-stage cooling, first paragraph is cooled to ultrafast cooling technique, and water-cooled cooling rate is 180 DEG C/s, and second segment is cooled to
Encryption cooling technique, water-cooled cooling rate is 60 DEG C/s；There is air cooling section between first paragraph cooling and second segment cooling, using air distribution
Machine, and the mode of side spray carries out air cooling, 680 DEG C of the started temperature of air cooling, air cooling time 8s；The instrument of measurement air cooling section temperature can
With 340 meters of movements after the 7th milling train；
Oiler temperature control is between 400～420 DEG C.
The performance of the high reaming steel that the present embodiment prepares is as shown in table 1.
Comparative example
Comparative example prepares the high reaming steel of reaming stable performance, and chemical composition is by mass percentage：
C：0.07%th, Si：0.15%th, Mn：1.50%th, P：0.005%th, S：0.005%th, Nb：0.065%, balance of Fe
And inevitable impurity.
The production method of the high reaming steel of the reaming stable performance of this comparative example, including converter smelting, application of vacuum, company
Casting, heating strand, roughing, finish rolling, the step cooling down, batching, wherein, critical process procedure parameter is as follows：
Slab heating temperature is 1250 DEG C, and the length of the strand obtaining is 10.0m；
1120 DEG C of the outlet temperature of roughing, 850 DEG C of the finishing temperature of finish rolling；Rolling process in roughing and finish rolling
In, steel rolling is rolled using quasi- constant speed technique, and the acceleration of steel rolling is 0.025m/s2.
In two-stage cooling, first paragraph cooling water-cooled cooling rate be 60 DEG C/s, second segment cooling water-cooled cooling rate be 40 DEG C/
s；There is air cooling section between first paragraph cooling and second segment cooling, using gas-distributing fan, and the mode of side spray carries out air cooling, air cooling
700 DEG C of started temperature, air cooling time 5s；The instrument of measurement air cooling section temperature can 35 meters of movements after the 7th milling train；
Oiler temperature control is between 430～520 DEG C.
The performance of the high reaming steel that comparative example prepares is as shown in table 1.
The performance parameter table of the high reaming steel of table 1 embodiment and comparative example preparation
Compared with comparative example, embodiment preferentially adopts the short base between a length of 6～8m of base to embodiment in Rolling production,
Before finish rolling, isothermal holding is carried out using thermal insulation cover, using quasi- constant speed rolling technique in the operation of rolling, steel rolling acceleration≤
0.005m/s2, and first paragraph cooling adopts ultrafast cold technique, up to 100～200 DEG C/s, second segment cooling is using encryption for cooling rate
Cooling technique, cooling rate is 60～120 DEG C/s, using above-mentioned technique, the high reaming steel of preparation, understands, mechanical property is full in conjunction with table 1
Sufficient yield strength ReL>=460MPa, tensile strength RmFor 580～700MPa, the requirement of elongation percentage A >=21%, and prepare
Coil of strip head, middle and end Mechanical Fluctuation within 20MPa, hole expansibility all more than or equal to 98%, and can be less than or equal to
105%, not only reaming performance raising, and the fluctuation range of same coil of strip head, middle and end hole expansibility is within 5%.
As depicted in figs. 1 and 2, embodiment 1 and the high reaming steel of comparative example preparation, the i.e. tail tissue of coil of strip are respectively obtained
Metallurgical structure figure, it can be seen from figure 1 that high reaming steel metallographic structure manufactured in the present embodiment is uniformly, hole is little.
Fig. 3 is the scanning electron microscope schematic diagram of comparative example coil of strip afterbody reaming sample, and as can be seen from Figure 3, coil of strip afterbody goes out
Existing more cavity, and these cavities are all caused by pearlite, it follows that in cooling stage, due to cooling technique
Improper, define substantial amounts of pearlite.
Above example is only optimal and illustrates, and is not the restriction to embodiments of the present invention.Except above-described embodiment
Outward, the present invention also has other embodiment.All employing equivalents or the technical scheme of equivalent transformation formation, all fall within the present invention
The protection domain requiring.
Claims (10)
1. a kind of reaming stable performance high reaming steel it is characterised in that：Chemical composition is by mass percentage：
C：0.06～0.10%, Si：0.10～0.25%, Mn：1.40～1.60%, P≤0.015%, S≤0.010%, Nb：
0.015～0.049%, balance of Fe and inevitable impurity.
2. reaming stable performance according to claim 1 high reaming steel it is characterised in that：Chemical composition presses percent mass
Number is calculated as：
C：0.06～0.10%, Si：0.10～0.25%, Mn：1.40～1.60%, P≤0.015%, S≤0.010%, Nb：
0.015～0.025%, balance of Fe and inevitable impurity.
3. reaming stable performance according to claim 1 and 2 high reaming steel it is characterised in that：Described high reaming steel
Hole expansibility is more than or equal to 98%, and is less than or equal to 105%, undulatory property≤5% of afterbody position hole expansibility in high reaming steel toe.
4. reaming stable performance according to claim 1 and 2 high reaming steel it is characterised in that：Described high reaming steel
Yield strength ReL>=460MPa, tensile strength RmFor 580～700MPa, afterbody position in elongation percentage A >=21%, and high reaming steel toe
Mechanical Fluctuation between 20Mpa.
5. reaming stable performance according to claim 3 high reaming steel it is characterised in that：The surrender of described high reaming steel
Intensity ReL>=460MPa, tensile strength RmFor 580～700MPa, the power of afterbody position in elongation percentage A >=21%, and high reaming steel toe
Learn performance inconsistency between 20MPa.
6. the production method of the high reaming steel of reaming stable performance described in a kind of claim 1, at converter smelting, vacuum
Reason, continuous casting, heating strand, roughing, finish rolling, the step that cools down, batch it is characterised in that：Critical process process is as follows：
Heating strand technical process, the strand obtaining is short base, and the length of short base is 4～8m；
Roughing and finish-rolling process process, using quasi- constant speed rolling technique, steel rolling acceleration≤0.007m/s2；
Cooling technique process, using two-stage cooling, the water-cooled cooling rate of first paragraph cooling is 80～220 DEG C/s, and second segment cools down
Water-cooled cooling rate be 40～140 DEG C/s；And first paragraph cooling and second segment cooling between be air cooling section, air cooling section point for measuring temperature away from
Move between 30～40m of F7 milling train.
7. the high reaming steel of reaming stable performance according to claim 6 production method it is characterised in that：First paragraph is cold
But adopt side spray afterwards, and be equipped with blower fan.
8. the high reaming steel of reaming stable performance according to claim 6 production method it is characterised in that：Heating strand
Technical process, heating-up temperature is 1220～1260 DEG C, and the strand obtaining is short base, and the length of short base is 6～8m；
Roughing and finish-rolling process process, using quasi- constant speed rolling technique, steel rolling acceleration≤0.005m/s2；
Cooling technique process, using two-stage cooling, first paragraph is cooled to ultrafast cooling technique, and water-cooled cooling rate is 100～200
DEG C/s, second segment be cooled to encrypt cooling technique, water-cooled cooling rate be 60～120 DEG C/s.
9. the high reaming steel of the reaming stable performance according to claim 6 or 7 or 8 production method it is characterised in that：Empty
Cold section of started temperature is 680～740 DEG C, and air cooling time is 8～12s.
10. the high reaming steel of the reaming stable performance according to claim 6 or 7 or 8 production method it is characterised in that：
Roughing technical process, 1080～1120 DEG C of the outlet temperature of roughing；
Finish-rolling process process, the steel billet before finish rolling adopts thermal insulation cover isothermal holding, 820～860 DEG C of the finishing temperature of finish rolling；
Coiling technique process, oiler temperature control is between 400～450 DEG C.
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| CN107747042A (en) * | 2017-11-06 | 2018-03-02 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of high reaming steel of the economical great surface quality of 690MPa levels and preparation method thereof |
| CN107760996A (en) * | 2017-09-25 | 2018-03-06 | 武汉钢铁有限公司 | A kind of hot-rolled dual-phase steel and its processing method |
| CN107829028A (en) * | 2017-11-06 | 2018-03-23 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of high reaming steel of the economical great surface quality of 450MPa levels and preparation method thereof |
| CN107868909A (en) * | 2017-11-06 | 2018-04-03 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of high reaming steel of the economical great surface quality of 580MPa levels and preparation method thereof |
| CN112779401A (en) * | 2019-11-07 | 2021-05-11 | 上海梅山钢铁股份有限公司 | High-reaming hot-rolled pickled steel plate with yield strength of 550MPa |
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| CN112779401A (en) * | 2019-11-07 | 2021-05-11 | 上海梅山钢铁股份有限公司 | High-reaming hot-rolled pickled steel plate with yield strength of 550MPa |
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