CN109402508A - A kind of low-carbon microalloyed Q690 grade high-strength weathering steel and preparation method thereof - Google Patents
A kind of low-carbon microalloyed Q690 grade high-strength weathering steel and preparation method thereof Download PDFInfo
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- 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
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- 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
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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Abstract
A kind of low-carbon microalloyed Q690 grade high-strength weathering steel and preparation method thereof, ingredient contains C 0.03~0.10% by weight percentage, Si 0.10~0.50%, Mn 1.20~2.00%, S 0.002~0.010%, P 0.003~0.015%, Al 0.01~0.05%, V 0.05~0.15%, N 0.01~0.02%, Cr 0.30~0.80%, Ni 0.30~0.80%, Cu 0.15~0.55%, Mo 0.15~0.55%, surplus Fe, 700~798MPa of yield strength, 795~950MPa of tensile strength, elongation percentage 15.5~18.6%；The preparation method comprises the following steps: (1) smelting molten steel, casts and forges；(2) 1100~1200 DEG C of heat preservation solid solutions are heated to；(3) roughing and finish rolling are carried out；Then water cooling is to 400~520 DEG C；(4) slow cooling of insulation quilt slot is to room temperature.Steel grade rolling operations of the invention are simple, handle without Q-tempering, atmospheric corrosion resistance, obdurability good combination property, have good low temperature impact properties.
Description
Technical field
The invention belongs to metallurgical technology field, in particular to a kind of low-carbon microalloyed Q690 grade high-strength weathering steel and its system
Preparation Method.
Background technique
The weathering steel accepted extensively in recent years by market is mainly 295MPa grades 09CuPTiRE, 345MPa grades
09CuPCrNi, 450MPa grades of Q450NQR1 several types, and the multiple field such as be widely used in railway, building, bridge, can
Resist the corrosion of industrial atmosphere, acid rain, marine atmosphere and seawater.But the intensity of weather-resistant steel plate is there are also to be hoisted, due to tradition
High-strength steel not only impact flexibility, weldability, fatigability are poor, but also be not resistant to atmosphere, marine environment, it is therefore, potential
The market demand promote to develop and high-intensitive have both the Thin Strip Steel of good weatherability properties to replace low-intensity Deformation in thick to become main
Research and development direction proposes the concept of high-performance weather-proof steel both at home and abroad；Weathering steel, which refers to, has protection rusty scale and resistance to atmosphere
The low-alloy structural steel of corrosion；For straight carbon steel, weathering steel supports erosion-resisting property with more excellent in atmospheric environment
Can, compared to for stainless steel, weathering steel can greatly reduce the additive amount of alloying element, the alloying elements such as P, Cu, Cr, V, Mo
Total amount only account for a few percent, steel product cost is effectively reduced.
Up to the present, domestic weathering steel and its manufacturing method about high-strength and high-weather-resistance has been applied multinomial；
The patent of application number 200710045329.X, describes a kind of high-corrosion resistant high-strength weather resisting steel and its manufacturing method, this method are adopted
It is designed, with the Cr-Ni-Cu set member of Ultra-low carbon, low manganese, middle chromium using Ti microalloying, produces yield strength and be greater than
High-weatherability high-strength weathering steel of 700MPa, 72h the alternate-immersion rate less than 25% (compared with Q345 straight carbon steel)；But it should
Cr content is up to 4.50% or more in scheme, be easy to cause cost of alloy higher, welding performance is bad；Application number
201010246778.2 patent, describe a kind of 700MPa grade Micro Alloyings of inexpensive yield strength handle high-strength weathering steels and its
Manufacturing method, this method are designed using high Ti ingredient, increase strengthening effect；The patent of application number 201410236616.9 is introduced
A kind of 700MPa grades of type of resistance to industrial atmospheric martensite steel plate and preparation method thereof；This method is tied to form using Nb-Ti to be set up separately
Meter makes the steel plate yield strength range prepared in 695~720MPa, tensile strength >=800MPa, elongation percentage >=18%, and -40
DEG C low-temperature impact work > 100J, resistance to industrial atmosphere year corrosion loss < 350g/m2。
The high-strength air corrosion-resistant steel of above-mentioned yield strength 700MPa intensity rank has been all made of low-carbon (or Ultra-low carbon)-
Based on silico-manganese steel, and the alloying elements microalloying route such as add suitable Cu, Ni, Cr, stress using Nb-Ti microalloying
Final products are obtained in conjunction with TMCP technology；But it is deposited using the high strength steel plate that Nb-Ti microalloy component system is produced
In drawback, hot rolling load weight, hot rolling technology control difficulty are big, steel yield tensile ratio is high, cost of alloy is high and strip rolls
Heat treatment procedure after system can also improve production cost.
Summary of the invention
For the above problem existing for existing weathering steel technology of preparing, the present invention provides a kind of low-carbon microalloyed Q690 grades
High-strength weathering steel and preparation method thereof designs the content for reducing alloying component by ingredient using V-N-Cr micro-alloying technology,
Promote Intragranular Acicular Ferrite forming core during billet rolling simultaneously, promotes plate center portion toughness and tenacity, pass through crystal grain refinement and analysis
Strengthen preparation Q690 grade high-strength weathering steel out.
The ingredient of low-carbon microalloyed Q690 grade high-strength weathering steel of the invention contain by weight percentage C 0.03~
0.10%, Si0.10~0.50%, Mn 1.20~2.00%, S 0.002~0.010%, P 0.003~0.015%, Al
0.01~0.05%, V 0.05~0.15%, N 0.01~0.02%, Cr 0.30~0.80%, Ni 0.30~0.80%, Cu
0.15~0.55%, Mo 0.15~0.55%, surplus are Fe and other inevitable impurity；Its yield strength 700~
798MPa, 795~950MPa of tensile strength, elongation percentage 15.5~18.6%, -60 DEG C of ballistic work >=100J, yield tensile ratio 0.84~
0.88。
Above-mentioned low-carbon microalloyed Q690 grade high-strength weathering steel with a thickness of 4~14mm.
The tissue of above-mentioned low-carbon microalloyed Q690 grade high-strength weathering steel is polygonal ferrite, acicular ferrite and grain
Shape bainite.
The preparation method of low-carbon microalloyed Q690 grade high-strength weathering steel of the invention the following steps are included:
1, set component smelting molten steel is pressed, then cast and is forged to 60~140mm of thickness, steel billet, ingredient are obtained
By weight percentage contain C 0.03~0.10%, Si 0.10~0.50%, Mn 1.20~2.00%, S 0.002~
0.010%, P 0.003~0.015%, Al 0.01~0.05%, V 0.05~0.15%, N 0.01~0.02%, Cr
0.30~0.80%, Ni 0.30~0.80%, Cu 0.15~0.55%, Mo 0.15~0.55%, surplus be Fe and other not
Evitable impurity；
2, using heating furnace by steel billet with stove heating to 1100~1200 DEG C and keep the temperature 2~4h, to guarantee that steel billet is sufficiently difficult to understand
Family name's body and microalloy element are sufficiently dissolved；
3, the steel billet after heat preservation is subjected to roughing and finish rolling；Wherein the start rolling temperature of roughing is 1050~1160 DEG C, finish to gauge
Temperature is 960~1080 DEG C；Finish rolling start rolling temperature is 860~900 DEG C, and finish rolling finishing temperature is 810~850 DEG C；Finish rolling is completed
Water cooling obtains hot rolled plate to 400~520 DEG C afterwards；
4, it puts hot rolled plate into insulation quilt slot slow cooling and low-carbon microalloyed Q690 grade high-strength weathering steel is made to room temperature.
In the above method, the rolling pass of roughing is 2~4 times, and reduction ratio is 24~28.6% per pass.
In the above method, the rolling pass of finish rolling is 6~7 times, and reduction ratio is 13~28% per pass.
In the above method, control cooling velocity is 25~45 DEG C/s when water cooling.
Weathering steel requires the ability of higher intensity and atmospheric corrosion resistance, while having both good impact flexibility and weldering
Connect performance；The present invention obtains the optimal effect of steel by the way of compound addition alloying element, passes through the members such as addition Cr, Mo
The atmospheric corrosion resistance of steel is usually significantly improved, while adding micro alloying element to improve the toughness of steel；The present invention
Ingredient design principle it is as follows:
C:C is most economical, most effective intensified element in steel, and the height of C content directly affects the intensity rank of steel, but
It is the atmospheric corrosion resistance that excessively high C content can not only destroy steel, also will affect the welding performance, toughness and punching performance of steel
Deng；Therefore the C content range used is 0.03~0.10%, by other alloying elements such as addition Si, Mn come compensation intensity；
Si:Si is conducive to improve intensity, yield point and the wearability of steel, and the solubility in α-Fe and γ-Fe is larger, rises
To solution strengthening effect, ferrite volume fraction in steel can be increased, refine crystal grain, be conducive to improve toughness；Si can also be improved
The resistivity of steel forms rich Si protective film in steel surface, improves corrosion resistance, with other elements such as Cu, Cr, P with the use of can be with
Improve the corrosion resistance of steel；The Si content range of use all can between 0.10~0.50% below or above this range
The toughness and plasticity of Resistance of Weld Metal have an adverse effect；
Mn:Mn is that one of most effective element of intensity of steel is compensated in the case where reducing C content, is added in steel appropriate
Mn, the harden ability of steel can be increased, play solution strengthening and Grain refinement, can also be reduced while improving intensity crisp
Sex reversal temperature is conducive to that middle temperature transformation occurs, but the excessive Mn content that increases can deteriorate the solderability of steel and welding heat affected
The toughness in area；Using Mn content range 1.20~2.00%, to obtain optimal acicular ferrite content and tough optimal
Match；
The presence of S:S can deteriorate the atmospheric corrosion resistance of steel, and S content is lower under the same terms, and the corrosion resistance of steel is better；
But Cu can obviously offset the illeffects of S in steel, the content of S is higher, and the effect that Cu reduces corrosion rate is more obvious, the two
The hole that rusty scale is filled in conjunction with insoluble compound is capable of forming prevents the further occurrence of corrosion；Therefore by the range of S content
Control is between 0.002~0.01%；
P:P is to improve one of most effective alloying element of steel weatherability, and the rusty scale of weathering steel is promoted to have amorphous nature
Fe3O4, have special effect；But the P of high-content will increase the cold brittleness of steel, deteriorate welding performance, cold-bending property；?
Under the conditions of atmospheric corrosion, the P in steel is anode depolarizing agent, can accelerate the uniform dissolution and Fe of steel2+Oxidation rate, facilitate
Uniform FeOOH rusty scale is formed in steel surface and promotes to generate the FeO for being rich in amorphous state FeOOHX(OH)3-2xFine and close protect
Cuticula makes to become the protective barrier that tissue corrosive medium enters steel matrix from atmospheric corrosion inside steel, therefore use
P content range is between 0.003~0.01%.
Al: the effect of fixed nitrogen and deoxidation is primarily served, Al, which engages the AlN to be formed with N, can effectively refine crystal grain, but Al
Too high levels can damage the tough of steel, therefore control its content in 0.01~0.05% range；
Cu:Cu is the key element for improving the atmospheric corrosion resistance of steel, when combining in addition steel with P, is shown excellent
The weather-proof effect of collaboration, improve the weather-resistant performance of steel；The Cu that face-centred cubic structure is added can make the cold short transformation of steel
Temperature improves, and increases amount containing Cu, and the yield strength of weathering steel is also accordingly increased；Therefore the Cu content used is in 0.15%-
In 0.55% range；
V: compared with Nb, the cracked probability of microalloy continuous casting billet is low, and V and N affinity are strong, easily combines, promotes VN's
It is precipitated, so that the V in steel is changed into precipitation state by solid solution state, significantly improve intensity, precipitation strength is up to 250~300MPa；V is still
Most economical micro alloying element, it can convert useful cheap alloying element for harmful N element originally, can be effective
Cost is reduced, therefore is 0.05~0.15% using the range of V content；
N: it is similar with the effect of C element, the intensity of steel can be improved in such a way that gap is dissolved, but be dissolved the N of state
There is biggish harm to plasticity, the toughness of steel, therefore the N content range used is 0.01~0.02%；
Ni:Ni is a kind of more stable element, and Ni, which is added, can be such that the corrosion potential of steel changes to positive direction, is increased
The stability of steel can improve toughness while improving intensity again, and improve harden ability, can effectively prevent the hot-short of Cu from causing
Check crack phenomenon；But excessively high Ni will increase cost, improve the adhesiveness of oxide skin, therefore by N content control 0.30~
In 0.80% range.
Cr:Cr has significant effect to the passivation ability for improving steel, can promote steel surface formed fine and close passivating film or
Person's protective rust, the enrichment in rusty scale can effectively improve rusty scale and penetrate characteristic to the selectivity of corrosive media, with
When Cu is added in steel simultaneously, effect is particularly evident, and Cr content is generally 0.4%~1.0% (up to 1.3%) in weathering steel；
The increase of Cr content can promote the yield strength of steel slightly to rise, but strengthening effect is not so good as Cu, and conjunction can be improved in the addition of Cr
The Cold Brittleness Transition Temperature of gold, therefore the range of Cr content is 0.30~0.80%.
Mo:Mo element can improve the brittleness of steel while increasing intensity, reduce the toughness of steel；When containing 0.4% in steel
When~0.5% Mo, the atmospheric corrosion rate of steel may be decreased half or less；Preferably, when Mo is in 0.1~0.25% model
In enclosing, there is steel excellent intensity and plasticity to match；Comprehensive various conditions, the content range of the Mo of use is 0.15~
0.55%.
Compared with prior art, present invention has an advantage that
(1) V-N-Cr micro-alloying technology is utilized, VN, V (C, N) nano-scale precipitate can be with during billet rolling
Promote Intragranular Acicular Ferrite forming core, promotes plate center portion toughness and tenacity, it is raw by the refining effect of crystal grain and the principle of precipitation strength
Produce Q690 grade high-strength weathering steel；The carbon content of the weathering steel is low, and weight percentage is 0.03~0.10%, and low-carbon design reduces
Carbon equivalent, can improving welding property, and avoid by controlled rolling and controlled cooling the formation of coarse cementite in steel plate tissue, steel plate is low
Warm impact flexibility is good.For the steel plate of different-thickness specification, optimize and have adjusted the content of the alloys such as Cr, Ni, V, Mo, saves
Cost, for iron and steel enterprise's product up-gradation, energy-saving significant；
(2) rolling operations are simple, using two-phase control rolling, roll state delivery, handle without Q-tempering, to equipment and
Technical requirements are not harsh, have atmospheric corrosion resistance, and obdurability good combination property has good low temperature impact properties, hold
It is easy to realize industrial production and promotes.
Steel prepared by the present invention after the alternate-immersion experiment of 360 hours simulation industrial atmospheric environments, lose by corrosion
Weight speed ratio straight carbon steel Q345B is slow, more obvious in the initial stage difference of abrasion cycle, using Q345B as control sample
Relatively corrosive rate reduces by 50% within 72 hours.
Steel grade rolling operations of the invention are simple, handle without Q-tempering, atmospheric corrosion resistance, and obdurability is comprehensive
Can be good, there are good low temperature impact properties, industrialized production easy to accomplish can be used for rolling stock manufacturing.
Detailed description of the invention
Fig. 1 is the preparation method flow diagram of the low-carbon microalloyed Q690 grade high-strength weathering steel of the present invention；
Fig. 2 is the OM organization chart of the low-carbon microalloyed Q690 grade high-strength weathering steel of embodiment 1；
Fig. 3 is the transmission shape appearance figure of the low-carbon microalloyed Q690 grade high-strength weathering steel of embodiment 2；
Fig. 4 is the low-carbon microalloyed Q690 grade high-strength weathering steel OM organization chart of embodiment 3.
Specific embodiment
Following non-limiting embodiments can with a person of ordinary skill in the art will more fully understand the present invention, but not with
Any mode limits the present invention.
Test method described in the embodiment of the present invention is unless otherwise specified conventional method；The reagent and material,
Unless otherwise specified, it commercially obtains.
Hot-rolling mill used in the embodiment of the present invention is that Northeastern University's rolling technique and tandem rolling automate National Key Laboratory
Φ 450mm hot-rolling mill.
The heating furnace used when furnace cooling in the embodiment of the present invention is high temperature box type resistance furnace, model RX4-85-
13B。
Transmission electron microscope used is FEI Tecnai G in the embodiment of the present invention2F20 Flied emission transmission electron microscopy
Mirror；
Scanning electron microscope used is LEICA-DMIRM optical electron microscope in the embodiment of the present invention.
Atmospheric corrosion resistance test is that " TB/T 2375-93 railway is used according to railroad industry standard in the embodiment of the present invention
Weathering steel alternate-immersion test method ".
The standard of welding crack sensibility index foundation is GB/T 1591-2008 in the embodiment of the present invention.
Embodiment 1
Process is as shown in Figure 1；
By set component smelting molten steel, is then cast and forged to thickness 140mm, obtain steel billet, ingredient is by weight
Percentage contains C 0.03%, Si 0.50%, Mn 2.00%, S 0.002%, P 0.010%, Al 0.04%, V 0.15%, N
0.02%, Cr 0.80%, Ni 0.80%, Cu 0.45%, Mo 0.55%, surplus are Fe and other inevitable impurity；
Steel billet to 1200 DEG C and is kept the temperature with stove heating by 2h using heating furnace, to guarantee the abundant austenitizing of steel billet and micro- conjunction
Gold element is sufficiently dissolved；
Steel billet after heat preservation is subjected to roughing and finish rolling；Wherein the start rolling temperature of roughing is 1160 DEG C, and finishing temperature is
1080℃；The rolling pass of roughing is 2 times, and reduction ratio is respectively 24% and 28.6%, roughing plate thickness 76mm per pass；Finish rolling
Start rolling temperature is 900 DEG C, and finish rolling finishing temperature is 850 DEG C；The rolling pass of finish rolling be 6 times, per pass reduction ratio be 13~
28%, total reduction 81%；Water cooling is to 520 DEG C (red temperature) after the completion of finish rolling, and control average cooling rate is 25 when water cooling
DEG C/s, obtain hot rolled plate, thickness 14mm；
It puts hot rolled plate into insulation quilt slot slow cooling and low-carbon microalloyed Q690 grade high-strength weathering steel is made to room temperature；
The yield strength 700MPa of low-carbon microalloyed Q690 grade high-strength weathering steel, tensile strength 795MPa, elongation percentage
18.6%, -60 DEG C of ballistic work 188J, yield tensile ratio 0.88；Tissue be polygonal ferrite, acicular ferrite and granular bainite,
OM tissue is as shown in Figure 2；Welding crack sensibility indices P cm is 0.27%；
Atmospheric corrosion resistance test is carried out, and as a comparison with ordinary carbon steel Q345B, each steel grade chooses 3 pieces of samples
Parallel test is carried out, the corrosion weight loss amount of every piece of sample per area per time is calculated, is averaged to obtain average corrosion
Rate；By above-mentioned weathering steel compared with the average corrosion rate of Q345B, its relatively corrosive rate is obtained；Above-mentioned weathering steel is put down
Equal corrosion weight loss rate is 2.896g/ (m2H), the average corrosion weight-loss ratio of Q345B straight carbon steel is 6.102g/ (m2H), relatively
Corrosion rate is 47.5%, illustrates that above-mentioned weathering steel also possesses apparent corrosion resisting property while intensity is greatly improved,
Corrosion resisting property is about twice of Q345B straight carbon steel.
Embodiment 2
With embodiment 1, difference is method:
(1) steel billet thickness 90mm, ingredient contain C 0.06%, Si 0.40%, Mn 1.60%, S by weight percentage
0.005%, P 0.015%, Al 0.05%, V 0.11%, N 0.015%, Cr 0.60%, Ni 0.50%, Cu 0.55%,
Mo 0.35%；
(2) to 1150 DEG C and 3h is kept the temperature with stove heating；
(3) start rolling temperature of roughing is 1080 DEG C, and finishing temperature is 980 DEG C；The rolling pass of roughing is 3 times, per pass
Reduction ratio is respectively 25%, 26% and 27%, roughing plate thickness 36.5mm；Finish rolling start rolling temperature is 900 DEG C, finish rolling finishing temperature
It is 810 DEG C；The rolling pass of finish rolling is 6 times, and reduction ratio is 13~28% per pass, total reduction 78%；Water after the completion of finish rolling
It is cooled to 460 DEG C, control average cooling rate is 36 DEG C/s, hot rolling plate thickness 8mm when water cooling；
(4) the yield strength 769MPa of low-carbon microalloyed Q690 grade high-strength weathering steel, tensile strength 910MPa, elongation percentage
16.2%, -60 DEG C of ballistic work 161J, yield tensile ratio 0.85；It is as shown in Figure 3 to transmit pattern；Welding crack sensibility indices P cm is
0.25%；
(5) atmospheric corrosion resistance test result are as follows: the average corrosion weight-loss ratio of above-mentioned weathering steel is 2.655g/ (m2·
H), relatively corrosive rate is 43.5%.
Embodiment 3
With embodiment 1, difference is method:
(1) steel billet thickness 60mm, ingredient contain C 0.10%, Si 0.10%, Mn 1.20%, S by weight percentage
0.010%, P 0.003%, Al 0.01%, V 0.05%, N 0.01%, Cr 0.30%, Ni 0.30%, Cu 0.15%,
Mo 0.15%；
(2) to 1100 DEG C and 4h is kept the temperature with stove heating；
(3) start rolling temperature of roughing be 1050~DEG C, finishing temperature be 960 DEG C；The rolling pass of roughing is 4 times, per pass
Secondary reduction ratio is 28%, 25%, 25% and 25%, roughing plate thickness 18mm；；Finish rolling start rolling temperature is 860 DEG C, finish rolling finish to gauge temperature
Degree is 810 DEG C；The rolling pass of finish rolling is 7 times, and reduction ratio is 13~28% per pass, total reduction 78%；After the completion of finish rolling
Water cooling is to 400 DEG C, and control average cooling rate is 45 DEG C/s, hot rolling plate thickness 4mm when water cooling；
(4) the yield strength 798MPa of low-carbon microalloyed Q690 grade high-strength weathering steel, tensile strength 950MPa, elongation percentage
15.5%, -60 DEG C of ballistic work 100J, yield tensile ratio 0.84；OM tissue is as shown in Figure 4；Welding crack sensibility indices P cm is
0.21%；
(5) atmospheric corrosion resistance test result are as follows: the average corrosion weight-loss ratio of above-mentioned weathering steel is 2.504g/ (m2·
H), relatively corrosive rate is 41.0%.
Claims (7)
1. a kind of low-carbon microalloyed Q690 grade high-strength weathering steel, it is characterised in that ingredient contain by weight percentage C 0.03~
0.10%, Si 0.10~0.50%, Mn 1.20~2.00%, S 0.002~0.010%, P 0.003~0.015%, Al
0.01~0.05%, V 0.05~0.15%, N 0.01~0.02%, Cr 0.30~0.80%, Ni 0.30~0.80%, Cu
0.15~0.55%, Mo 0.15~0.55%, surplus are Fe and other inevitable impurity；Its yield strength 700~
798MPa, 795~950MPa of tensile strength, elongation percentage 15.5~18.6%, -60 DEG C of ballistic work >=100J, yield tensile ratio 0.84~
0.88。
2. low-carbon microalloyed Q690 grade high-strength weathering steel according to claim 1, it is characterised in that low-carbon microalloyed
Q690 grade high-strength weathering steel with a thickness of 4~14mm.
3. low-carbon microalloyed Q690 grade high-strength weathering steel according to claim 1, it is characterised in that low-carbon microalloyed
The tissue of Q690 grade high-strength weathering steel is polygonal ferrite, acicular ferrite and granular bainite.
4. a kind of preparation method of low-carbon microalloyed Q690 grade high-strength weathering steel, it is characterised in that the following steps are included:
(1) set component smelting molten steel is pressed, then cast and is forged to 60~140mm of thickness, obtains steel billet, ingredient is by weight
It measures percentage and contains C 0.03~0.10%, Si 0.10~0.50%, Mn 1.20~2.00%, S 0.002~0.010%, P
0.003~0.015%, Al 0.01~0.05%, V 0.05~0.15%, N 0.01~0.02%, Cr 0.30~0.80%,
Ni 0.30~0.80%, Cu 0.15~0.55%, Mo 0.15~0.55%, surplus are Fe and other inevitable impurity；
(2) using heating furnace by steel billet with stove heating to 1100~1200 DEG C and keep the temperature 2~4h, to guarantee the abundant austenite of steel billet
Change and microalloy element is sufficiently dissolved；
(3) steel billet after heat preservation is subjected to roughing and finish rolling；Wherein the start rolling temperature of roughing is 1050~1160 DEG C, finishing temperature
It is 960~1080 DEG C；Finish rolling start rolling temperature is 860~900 DEG C, and finish rolling finishing temperature is 810~850 DEG C；Water after the completion of finish rolling
It is cooled to 400~520 DEG C, obtains hot rolled plate；
(4) it puts hot rolled plate into insulation quilt slot slow cooling and low-carbon microalloyed Q690 grade high-strength weathering steel is made to room temperature.
5. the preparation method of low-carbon microalloyed Q690 grade high-strength weathering steel according to claim 4, it is characterised in that step
Suddenly the rolling pass of roughing is 2~4 times in (3), and reduction ratio is 24~28.6% per pass.
6. the preparation method of low-carbon microalloyed Q690 grade high-strength weathering steel according to claim 4, it is characterised in that step
Suddenly the rolling pass of finish rolling is 6~7 times in (3), and reduction ratio is 13~28% per pass.
7. the preparation method of low-carbon microalloyed Q690 grade high-strength weathering steel according to claim 4, it is characterised in that step
Suddenly controlling cooling velocity in (3) when water cooling is 25~45 DEG C/s.
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