CN103695801B - A kind of high tenacity, high weather resistance steel and manufacture method thereof - Google Patents
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Abstract
A kind of high tenacity, high weather resistance steel and manufacture method thereof, its composition by weight percent is: C0.035～0.075%, Si≤0.30%, Mn0.40～0.80%, P0.07～0.11%, S≤0.004%, Cu0.20～0.50%, Ni0.10～0.40%, Cr0.40～0.70%, Ti0.008～0.016%, Nb0.010～0.030%, N≤0.0050%, Ca0.001%～0.004%, all the other are for Fe and are unavoidably mingled with；It adopts based on the carbon manganese steel component system of the low Mn-height P of low C-, by Cu+Ni+Cr alloying, controls [%C]/[%P] >=0.49, [%Mn]/[%C] >=10, weatherability index DNH>=6.50%, [%C] × ([%P]+2.5 [%S])≤0.0025, [%Ca]/[%S]=1.0～3.0, ([%Cu]+0.36 [%Ni]+0.27 [%Cr]) × [%P] >=0.030, [%Ca] × [%S]0.28≤ 0.002, adopt TMCP technique, there is superior low-temperature toughness, bending cold working characteristic and high-weatherability, be suitable for being used as without application speed train cars body structure.
Description
Technical field
The present invention relates to a kind of high tenacity, high weather resistance steel and manufacture method thereof, its yield strength >=355MPa, tensile strength >=490MPa, Charpy side knock merit (single the value) >=47J of-40 DEG C, relatively common structural steel rate of corrosion≤20%, be mainly used in various speed train cars housing.
Background technology
It is known that, low-carbon (LC) (high intensity) low-alloy steel is one of most important structural timber, is widely used among petroleum natural gas pipeline, ocean platform, shipbuilding, bridge structure, boilers and pressure vessel, building structure, auto industry, railway transportation and machine-building.Low-carbon (LC) (high intensity) low-alloy steel performance depends on the process system of its chemical composition, manufacture process, wherein intensity, toughness and weldability are the most important performances of low-carbon (LC) (high intensity) low-alloy steel, and it is finally decided by the microscopic structure state of finished steel.Along with science and technology constantly advances, the obdurability of steel, weldability are proposed higher requirement by people, namely while maintaining relatively low manufacturing cost, comprehensive mechanical performance and the serviceability of steel plate are significantly increased, save cost to reduce the consumption of steel, alleviate steel beam column own wt, stability and safety.
The research climax of development a new generation high-performance steel iron material has been started in current world wide, designed by alloy combination, reform controlled rolling/TMCP technology and Technology for Heating Processing acquisition better microscopic structure coupling, so that steel plate obtains more excellent strength-toughness, strong plasticity coupling, low yield strength ratio, atmospheric corrosion resistance, more excellent weldability and anti-fatigue performance；Steel plate of the present invention adopts above-mentioned technology just, develops the weather-proof building structural steel plate that comprehensive mechanical property, welding performance are all excellent at low cost.
When prior art manufactures atmospheric corrosion resistance Welding Structure steel plate; in steel, generally to add the weatherability alloying elements such as a certain amount of P, Ni, Cu, Cr; purpose is to form amorphous protecting film one layer fine and close at surface of steel plate, stops air to enter inside steel plate, reaches atmospheric corrosion resistance effect.Thus bringing mother metal steel plate toughness, weldability, especially steel plate cold-forming property is poor, it is impossible to meet the requirement such as imposite length direction, imposite 90 degree of machine-shapings of width clod wash；Adopt the design of low C content composition for this Japan, add tiny alloying element Ti, Nb, in conjunction with controlled rolling technique, make Plate Welding and low-temperature flexibility be greatly improved, (referring to " ferrum processed research ", 1982, Vol.309, P98；R&D Kobe Steel skill report, 1988, Vol.38, P97).
For the weathering steel that exploitation cold district uses, Japan adopts the low C-height Al-micro-Ti of low N-to be processed into a point designing technique, successfully produces satisfied-40 DEG C of low-temperature flexibility weather-resistant steel plates in conjunction with controlled rolling technique, (referring to " ferrum と steel ", 1985, Vol.71, S593).
But these steel plates are also without when relating to cold-formed, imposite length direction, 90 degree of clod wash machine-shapings of width；Secondly, Cr element is greatly lowered the intensity of ferrite+pearlitic microstructure controlled rolling steel plate and the amplitude of reduction yield strength more than the amplitude reducing tensile strength (referring to " Western Hills souvenir technology lecture " 86-87, P11), adopting controlled rolling process to produce high working property, there is bigger difficulty in the high durable steel plate of high tenacity；A large amount of patent documentations only illustrate how to realize the low-temperature flexibility of mother metal steel plate simultaneously, for how under soldering conditions, obtain excellent heat affected area (HAZ) low-temperature flexibility and illustrate less, during especially with Large Heat Input Welding, how to ensure that the low-temperature flexibility of heat affected area (HAZ) is few.
Summary of the invention
It is an object of the invention to provide a kind of high tenacity, high weather resistance steel and manufacture method thereof, its yield strength >=355MPa, tensile strength >=490MPa, Charpy side knock merit (single the value) >=47J of-40 DEG C, relatively common structural steel rate of corrosion≤20%, be suitable for being used as without application speed train cars body structure, and be capable of low cost stablize bulk industrial produce.
For reaching above-mentioned purpose, the technical scheme is that
High tenacity, high cold worked high durable steel plate are one of kinds that in plate product, difficulty is bigger, its reason is that such steel plate does not require nothing more than ultralow C content and high intensity, high-weatherability and excellent low-temperature flexibility and cold-formed property, and steel plate also to have good weldability, can implementing weld job under lowered in field environment, quality of weld joint meets the high ferro requirement to compartment；These performance requirements are difficult to meet simultaneously.Collide with each other on composition design and processes designs between ultralow C content and high intensity, high-weatherability and excellent low-temperature flexibility and cold-formed property, be difficult to be in harmonious proportion, when namely reducing C content, be difficulty with the high intensity of high durable steel plate；When improving weatherability, it is difficulty with the excellent low-temperature flexibility of steel plate and cold-formed property；How balancing ultralow C content and high intensity, high-weatherability and high P content and low-temperature flexibility and cold-formed property is one of maximum difficult point of this product, is also key core technology；Therefore the present invention is in key technology route, composition and technological design, combine key factors such as affecting steel plate high tenacity, high-weatherability, high intensity, high cold-formed property and steel plate solderability, creatively have employed based on the carbon manganese steel component system of the low Mn-height P content of low C-, adopt Cu+Ni+Cr alloying, control [%C]/[%P] >=0.49, [%Mn]/[%C] >=10, weatherability index DNH>=6.50% and ([%Cu]+0.36 [%Ni]+0.27 [%Cr]) × [%P] >=0.030, control [%C] × ([%P]+2.5 [%S])≤0.0025, Ca processes and [%Ca]/[%S] ratio controls between 1.0～3.0 and [%Ca] × [%S]0.28≤ 0.002, adopt special TMCP technique, it is thus achieved that superior low-temperature toughness, bending cold working characteristic and high-weatherability steel plate, be particularly suitable for being used as without application speed train cars body structure, and be capable of low cost and stablize bulk industrial production.
Concrete, the high tenacity of the present invention, high weather resistance steel, its composition by weight percent is:
C:0.035%～0.075%
Si :≤0.30%
Mn:0.40%～0.80%
P:0.07%～0.11%
S :≤0.004%
Cu:0.20%～0.50%
Ni:0.10%～0.40%
Cr:0.40%～0.70%
Ti:0.008%～0.016%
Nb:0.010%～0.030%
N :≤0.0050%
Ca:0.001%～0.004%
All the other are for Fe and are inevitably mingled with；And above-mentioned element must simultaneously meet following relation:
[%Mn]/[%C] >=10, with ensure steel plate crystal grain uniformly tiny and at-40 DEG C Charpy bar fracture fibre ratio at least above 50%；
[%C]/[%P] >=0.49, it is ensured that abundant C atom segregation is on crystal boundary, it is suppressed that P atom is at Grain Boundary Segregation, it is prevented that intergranular flwrittle fracture pattern occurs, improves weather-resistant steel plate low-temperature flexibility and bending cold working characteristic；This is one of key component design of the present invention.
Weatherability index DNH>=6.5% and ([%Cu]+0.36 [%Ni]+0.27 [%Cr]) × [%P] >=0.03, it is ensured that steel plate has high weatherability, weatherability index DNH=26.01 [%Cu]+3.88 [%Ni]+1.2 [%Cr]+1.49 [%Si]+17.28 [%P]-7.29 [%Cu] × [%Ni]-9.10 [%Ni] × P-33.39 [%Cu]2；This is also one of key component design of the present invention.
Control [%C] × ([%P]+2.5 [%S])≤0.0025, Ca processes and [%Ca]/[%S] ratio controls between 1.0～3.0 and [%Ca] × [%S]0.28≤ 0.002, it is ensured that steel plate has high bending cold working characteristic, it is adaptable to imposite length direction, 90 degree of clod wash machine-shaping requirements of width, meet the cold forming requirement manufacturing high ferro railway car；This is also one of key component design of the present invention.
It is known that carbon is very big on steel plate low-temperature flexibility, weldability impact, from low-temperature flexibility and the weldability angle of improving steel plate, it is desirable in steel, C content is relatively low is advisable；But from the intensity of steel plate, prior unsuitable too low from TMCP process microstructures Control, C content, it is high that too low C content not only results in austenite grain boundary mobility, and this brings bigger problem to the uniform thinning microstructure of TMCP process, is easily formed mixed grain structure；Too low C content also results in Grain-boundary Junctions reduction with joint efforts simultaneously, and especially when high P content, aggravation P, at Grain Boundary Segregation, weakens Grain-boundary Junctions and makes a concerted effort, cause steel plate low temperature intergranular flwrittle fracture；When C content is higher than 0.09%, not only molten steel solidification enters peritectic reaction district, causes that slab internal segregation, face crack form probability and increase, especially, when high P content, high C promotes that slab internal segregation is geometrical progression increase, severe exacerbation steel plate endoplasm and mechanical performance；Comprehensive above factor, the content of C controls between 0.035%～0.075%.
Si promotes deoxidation of molten steel and can improve armor plate strength, but adopt the molten steel of Al deoxidation, the deoxidation of Si is little, although Si can improve the intensity of steel plate, but Si seriously damages low-temperature flexibility and the weldability of steel plate, especially when high P content, Si promotes the increase of slab internal segregation degree, severe exacerbation steel plate endoplasm and mechanical performance, and therefore the Si content in steel should control low as far as possible, considering economy and the operability of steelmaking process, Si content controls≤0.30%.
Mn as alloying element in steel plate except improving intensity and except improving toughness, also there is expansion austenite phase field, reduce Ac1、Ac3、Ar1、Ar3Point temperature, the effect of thinning microstructure crystal grain；Addition is very few, and mixed crystal phenomenon even occurs in steel plate coarse grains；Adding too much Mn and can increase steel plate internal segregation degree, reduce uniformity and the low-temperature flexibility of mechanical property of steel plate, especially when high P content, high Mn promotes that slab internal segregation is geometrical progression increase, severe exacerbation steel plate endoplasm and low-temperature flexibility；Considering above-mentioned factor, Mn content controls between 0.40%～0.80%.
P is the element that the contribution of steel plate weatherability is maximum, but P is huge to the low-temperature impact toughness of steel plate, weldability infringement；For ensureing that steel plate has high-weatherability, steel adds a number of P inevitable；But can be by adding a certain amount of Cu, Cr, Ni unit in steel and usually increase steel plate weatherability, Substitute For Partial substitutes P element and reduces P element addition, improves steel plate low-temperature flexibility and cold-workability；Therefore, when comprehensive steel plate mechanical performance, weldability and manufacturing cost, rational P content controls between 0.07%～0.11%.
To be mingled with the low-temperature flexibility to steel plate (especially horizontal low-temperature flexibility), weatherability infringement very big as harmful in steel for S, the more important thing is that S is combined with Mn in steel, form MnS field trash, in the hot rolling, the plasticity of MnS makes MnS along rolling to extension, formed along rolling to MnS field trash band, the serious infringement horizontal low-temperature flexibility of steel plate, Z-direction performance and clod wash processability；Simultaneously S still casts, produces hot short essential element in course of hot rolling；Wish that S content is more low more good in theory, but consider economy and the operability of steelmaking process, it is desirable to S content controls≤0.004%.
The contribution of steel plate weatherability is only second to P element by Cu element, and it is requisite for adding a number of Cu in high weather resistance steel；Additionally, Cu is as austenite stabilizer element, it is possible to improve armor plate strength and the impact of steel plate low-temperature flexibility is less simultaneously；But when adding too much Cu (>=0.50%), especially when high P content, form low melting point Cu at crystal boundaryxPyIntermetallic compound, causes serious copper brittleness and intergranular flwrittle fracture；If but added Cu content very few (< 0.20%), steel plate would not reach and improves high-weatherability requirement, and therefore Cu content controls between 0.20%～0.50%.
Xiang Gangzhong adds a number of Ni, it is also possible to improve steel plate weatherability；The more important thing is that adding Ni in steel is possible to prevent copper brittleness to occur, reduce the fire check sensitivity of casting, hot rolling and welding process；Additionally, Ni is steel plate obtains the indispensable alloying element of superior low-temperature toughness；Therefore theoretically, in steel, Ni content is more high more good within the specific limits, but Ni is expensive heavy alloying element, produces angle in batches from low cost, and suitable addition is 0.10%～0.40%.
For high weather resistance steel, Cr element promotes that fine and close amorphous oxide layer effect is relatively big, and it is requisite for adding a number of Cr in high weather resistance steel；Add a number of Cr (≤0.70%) and and can bend under cold worked condition not damaging the low-temperature flexibility of steel plate, improve the weatherability of steel plate；If but added Cr content very few (< 0.40%), Cr would be less to the contribution of steel plate weatherability, does not reach high-weatherability requirement；Add too much (> 0.70%), damage low-temperature flexibility and the bending cold-workability of steel plate；Therefore Cr content controls between 0.40%～0.70%.
The span of control of N is corresponding with the span of control of Ti, and for controlling steel plate crystal grain, improving steel plate low-temperature flexibility and weldability, Ti/N is best between 1.5～3.5.N content is too low, and TiN number of particles is few, size is big in generation, it is impossible to plays the effect controlling steel plate crystal grain and improves steel plate low-temperature flexibility and weldability, on the contrary steel plate low-temperature flexibility is harmful to weldability；But when N content is too high, in steel, freely [N] increases, especially when Large Heat Input Welding, heat affected area (HAZ) freely [N] content sharply increases, and seriously infringement HAZ low-temperature flexibility and bending cold-workability, worsen the processing operating characteristic of steel.Therefore N content controls≤0.0050%.
The Ti purpose adding trace in steel is that N is combined in steel, generates the TiN particle that stability is significantly high, it is suppressed that steel plate crystal grain and welded thin-wall box component district grain growth；The Ti content added in steel to mate with the N content in steel, and the principle of coupling is that TiN can not precipitate out in liquid molten steel and must precipitate out in solid phase；Therefore the Precipitation Temperature of TiN must assure that lower than 1400 DEG C；When Ti addition very few (< 0.008%) in steel, form TiN number of particles not enough, be not enough to inhibiting grain growth and change welded thin-wall box component second-order phase transition product and improve low-temperature flexibility and the weldability of steel plate；Add Ti content too much (> 0.016%) time, TiN Precipitation Temperature is more than 1400 DEG C, part TiN granule precipitates out large-sized TiN particle in solidification of molten steel process, this large scale TiN particle not only can not inhibiting grain growth, become the starting point of crack initiation on the contrary；Therefore the optimum controling range of Ti content is 0.008%～0.016%.
The Nb element purpose adding trace in steel is to improve recrystallization to stop temperature, expands controlled rolling process window, carries out non-recrystallization controlled rolling, improves TMCP steel plate obdurability, improve TMCP steel plate cold working characteristic；When Nb addition is lower than 0.010%, except the controlled rolling effect that can not effectively play, TMCP steel plate phase transformation strengthening ability is also not enough；When Nb addition is more than 0.030%, Nb improves steel plate low-temperature flexibility effect by controlled rolling and reaches capacity, and causes valuable Nb element resource to waste, and increases manufacturing cost, and therefore Nb content controls 0.015%～0.030%.
Steel is carried out Ca process, on the one hand can pure molten steel, on the other hand steel medium sulphide content is carried out degenerative treatments, so as to become non deformable, stablize tiny spherical sulfide, suppress the red brittleness of S, improve steel plate impact flexibility and cold working characteristic, improve the anisotropy of steel plate mechanical performance；The number of Ca addition, depend on the height of S content in steel, Ca addition is too low, and treatment effect is little, and Ca addition is too high, form Ca (O, S) size is thick, and fragility also increases, and can become fracture crack starting point, reduce low-temperature flexibility and the cold working characteristic of steel, also reduce purity of steel simultaneously, pollute molten steel.General control Ca content presses ACR=Ca [1-1.24 × O]/1.25 × S, and wherein ACR is sulphide inculsion shape control characteristic, is advisable between span 1.0～3.0, and therefore the span of control of Ca content is 0.001%～0.004%.
It is uniformly tiny according to steel plate tissue of the present invention and comprises the bainite of ferrite+pearlite+Dispersed precipitate of substructure, it is achieved the high intensity of steel plate, high tenacity, high-weatherability and excellent bending cold working characteristic.
The high tenacity of the present invention, high weather resistance steel manufacture method, it comprises the steps:
1) smelt, cast
By mentioned component smelting, continuous casting process, and adopting soft reduction technique, Continuous Casting Soft Reduction amount controls between 3mm～8mm, basket pouring temperature 1535 DEG C～1555 DEG C, casting speed 0.7m/min～1.0m/min；
2) heating of plate blank, heating-up temperature 1100 DEG C～1200 DEG C, slab adopts high-pressure water descaling after coming out of the stove, and de-scaling not to the utmost can de-scaling repeatedly；
3) rolling
First stage is common rolling, adopts uninterrupted continuous rolling mode, it is ensured that shape changing metal occurrence dynamics/Static Recrystallization, fining austenite grains；
Second stage adopts the controlled rolling of austenite one phase district, controlled rolling start rolling temperature 860 DEG C～900 DEG C, rolling pass reduction ratio >=7%, accumulative reduction ratio >=60%, finishing temperature 780 DEG C～820 DEG C；
4) cooling
After controlled rolling terminates, steel plate is transported to ACC equipment place, time of delivery≤30s immediately, and steel plate is accelerated cooling immediately；Cold temperature 770 DEG C～810 DEG C opened by steel plate, rate of cooling >=10 DEG C/s, stop cold temperature and be≤400 DEG C, steel plate natural air cooling to room temperature stops cold temperature with rate of cooling setting subsequently is one of key technology of the present invention, rate of cooling >=10 DEG C/s, stop cold temperature and be≤400 DEG C, can fully suppress the high durable steel plate P of high P content at Grain Boundary Segregation, cause steel plate intergranular flwrittle fracture, improve steel plate low-temperature flexibility and bending cold-workability；This is one of critical process design of the present invention.
In order to obtain excellent cold-forming property, reducing C content and other alloying element contents are necessary, especially when high P content, adopting the design of Ultra-low carbon, low-carbon-equivalent is unique selection；But the design of Ultra-low carbon, low-carbon-equivalent will cause that armor plate strength is not enough, therefore adopt bainite strengthening essential, in order to obtain bainite structure, it is necessary to adopt and roll rear accelerated cooling process, it is ensured that obtain bainite structure；Secondly, when high P content, in order to obtain excellent low-temperature flexibility, crystal grain thinning is unique selection, it is therefore necessary to adopt controlled rolling technique, it is ensured that grain refinement；2 contents of summary, in the composition range of above-mentioned design, adopt TMCP technique (i.e. controlled rolling+acceleration cooling), it is thus achieved that comprise the bainite of the ferrite+pearlite+Dispersed precipitate of substructure, it is achieved the high cold working characteristic of high P content steel plate and excellent low-temperature flexibility.
The invention has the beneficial effects as follows:
The present invention adopts alloying element modular design to combine with special TMCP technique, improve alloying element P, Cu, Ni, Cr to greatest extent and improve weather resisteant and the potential of comprehensive mechanical property (especially tensile strength and low-temperature flexibility), reduce a ton consumption of steel expensive alloying elements Cu, Ni, Cr；And by special TMCP technology generations for Technology for Heating Processing, decrease manufacturing process, shorten the manufacturing cycle；Steel plate obtains high intensity, high tenacity, high-weatherability and excellent bending cold working characteristic, be particularly suitable for manufacture speed train cars housing, and be capable of low cost stablize bulk industrial production；The present invention is not only greatly lowered precious resource consumption, reduces manufacturing cost, shortens the manufacturing cycle, also eliminates the difficulty that a large amount of waste steel recycling containing Cu, Ni recycles, it is achieved the environmental protection of manufacture process simultaneously；Steel plate end-of-development of the present invention high ferro train tank material from method, moral import situation, has filled up domestic blank.
Accompanying drawing explanation
Fig. 1 is the microscopic structure (1/4 thickness place) of embodiment of the present invention steel 5.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention will be further described.
Table 1 is the composition of embodiment of the present invention steel, and table 2 is the manufacturing process of embodiment of the present invention steel.Table 3 is the performance of embodiment of the present invention steel.
Embodiment of the present invention technique is: TDS molten iron deep desulfuration → converter smelting → LF → RH (feed Si-Ca silk) → continuous casting (adopts slighter compress technique), and → slab rolls off the production line that finishing → slab scale fire cuts → heat → TMCP → steel plate slow cooling → AUT/MUT → swarf, crop end → sampling and performance test → cut scale steel plate → surface quality and apparent size, mark and detection → dispatch from the factory.
Referring to Fig. 1, it show the microscopic structure of the embodiment of the present invention 5 steel plate, it is the bainite of ferrite+pearlite+Dispersed precipitate that is uniformly tiny and that comprise substructure, it is achieved that the high intensity of steel plate, high tenacity, high-weatherability and excellent bending cold working characteristic.
The present invention is according to steel plate technical characterstic, combined with special TMCP technique by the modular design of rational alloying element, steel plate obtains high intensity, high tenacity and excellent bending cold working characteristic, thus improves component security reliability, shortens time and difficulty, the cost having saved the manufacture of user's component of user's component manufacture；The high durable of steel plate, without coating, greatly reduces user's maintenance, use cost, extends component and is on active service the cycle, creates huge value for user；Thus this type of steel plate is the product of high added value, green environmental protection；Owing to need not add any equipment in Plate Production process of the present invention, manufacturing process is succinct, production process controls easily, therefore cheap for manufacturing cost, has very high cost performance and the market competitiveness；And technological adaptability is strong, it is possible to all Heavy Plate Production producer popularizations having and accelerating cooling device, there is very strong business promotion, there is higher technology trade and be worth.
Along with China's sustained economic development, especially high-speed railway traffic engineering construction amount is increasing for railway traffic, the project that green environmental protection material is promoted as state key increasingly comes into one's own, environmental protection firm constraints index will expand to infrastructure project project gradually, have wide market prospect as environmental type high-performance weather-proof vehicle high strength steel plate.Current Baogang Stocks Trading Co. Thick Plate Plant successfully adopts the high durable steel plate of special high-strength, the high-ductility of this technology low cost, the stable high ferro train producing high comprehensive performance in bulk, first batch of 150 tons of high durable steel plates are used for high ferro engineering project, manufacture high-speed train end structure in Nanjing carshop.
Claims (2)
1. high tenacity, a high weather resistance steel, its composition by weight percent is:
C:0.035%～0.075%
Si :≤0.30%
Mn:0.40%～0.80%
P:0.07%～0.11%
S :≤0.004%
Cu:0.20%～0.50%
Ni:0.10%～0.40%
Cr:0.40%～0.70%
Ti:0.008%～0.016%
Nb:0.010%～0.030%
N :≤0.0050%
Ca:0.001%～0.004%
All the other are for Fe and are inevitably mingled with；And above-mentioned element must simultaneously meet following relation:
[%Mn]/[%C] >=10；
[%C]/[%P] >=0.49,
Weatherability index DNH>=6.5%,
([%Cu]+0.36 [%Ni]+0.27 [%Cr]) × [%P]) >=0.03,
Weatherability index DNH=26.01 [%Cu]+3.88 [%Ni]+1.2 [%Cr]+1.49 [%Si]+17.28 [%P]-7.29 [%Cu] × [%Ni]-9.10 [%Ni] × P-33.39 [%Cu]2；
[%C] × ([%P]+2.5 [%S])≤0.0025；
[%Ca]/[%S] ratio controls between 1.0～3.0, [%Ca] × [%S]0 . 28≤ 0.002, it is thus achieved that steel plate tissue be uniformly tiny and comprise the bainite of ferrite+pearlite+Dispersed precipitate of substructure；Yield strength >=the 355MPa of described steel, tensile strength >=490MPa, the single value >=47J of Charpy side knock merit of-40 DEG C, relatively common structural steel rate of corrosion≤20%.
2. the manufacture method of high tenacity as claimed in claim 1, high weather resistance steel, it comprises the steps:
1) smelt, cast
By mentioned component smelting, continuous casting process, and adopting soft reduction technique, Continuous Casting Soft Reduction amount controls between 3mm～8mm, basket pouring temperature 1535 DEG C～1555 DEG C, casting speed 0.7m/min～1.0m/min；
2) heating of plate blank, heating-up temperature 1100 DEG C～1200 DEG C, slab adopts high-pressure water descaling after coming out of the stove, and de-scaling not to the utmost can de-scaling repeatedly；
3) rolling
First stage is common rolling, adopts uninterrupted continuous rolling mode, it is ensured that shape changing metal occurrence dynamics/Static Recrystallization, fining austenite grains；
Second stage adopts the controlled rolling of austenite one phase district, controlled rolling start rolling temperature 860 DEG C～900 DEG C, rolling pass reduction ratio >=7%, accumulative reduction ratio >=60%, finishing temperature 780 DEG C～820 DEG C；
4) cooling
After controlled rolling terminates, steel plate is transported to ACC equipment place, time of delivery≤30s immediately, and steel plate is accelerated cooling immediately；Steel plate opens cold temperature 770 DEG C～810 DEG C, rate of cooling >=10 DEG C/s, stops cold temperature and is≤400 DEG C, and steel plate natural air cooling is to room temperature subsequently；The steel plate tissue obtained is uniformly tiny and comprises the bainite of ferrite+pearlite+Dispersed precipitate of substructure；Yield strength >=the 355MPa of described steel, tensile strength >=490MPa, the single value >=47J of Charpy side knock merit of-40 DEG C, relatively common structural steel rate of corrosion≤20%.
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