CN103695801A - High-toughness and high-weather-resistance steel and manufacturing method thereof - Google Patents
High-toughness and high-weather-resistance steel and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses high-toughness and high-weather-resistance steel and a manufacturing method thereof. The high-toughness and high-weather-resistance steel comprises the following components in percentage by weight: 0.035-0.075% of C, no more than 0.30% of Si, 0.40-0.80% of Mn, 0.07-0.11% of P, no more than 0.004% of S, 0.20-0.50% of Cu, 0.10-0.40% of Ni, 0.40-0.70% of Cr, 0.008-0.016% of Ti, 0.010-0.030% of Nb, no more than 0.0050% of N, 0.001%-0. 004% of Ca, and the balance of Fe and unavoidable impurities, wherein by taking a C-Mn-P component system with low C, low Mn and high P as a foundation and through the alloying of Cu, Ni and Cr, [%C]/[%P] is controlled to be not smaller than 0.49, [%Mn]/[%C] is controlled to be not smaller than 10, the weather resistance index DNH is controlled to be not smaller than 6.50%, [%C]*([%P]+2.5[%S]) is controlled to be not more than 0.0025, [%Ca]/[%S] is controlled to be equal to 1.0-3.0, ([%Cu]+0.36[%Ni]+0.27[%Cr])*[%P] is controlled to be not smaller than 0.030, [%Ca]*[%S]0.28 is controlled to be not more than 0.002, and a TMCP (ThermoMechanical Control Process) is adopted. Therefore, the high-toughness and high-weather-resistance steel has excellent low-temperature toughness, bending cold machining characteristic and high weather resistance, and is suitable to be used as a compartment body structure of a coating-free high-speed train.
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 transverse impact merit (single the value) >=47J of-40 ℃, relative General Structural Steel corrosion rate≤20%, be mainly used in various speed train cars housings.
Background technology
As everyone knows, low-carbon (LC) (high strength) 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, automotive industry, transportation by railroad and machinofacture.Low-carbon (LC) (high strength) low alloy steel performance depends on the process system of its chemical composition, manufacturing processed, wherein intensity, toughness and weldability are the most important performances of low-carbon (LC) (high strength) low alloy steel, and its final decision is in the microstructure state of finished steel.Along with science and technology constantly advances, people propose higher requirement to the obdurability of steel, weldability, when maintaining lower manufacturing cost, improve significantly comprehensive mechanical performance and the use properties of steel plate, cost-saving with the consumption of minimizing steel, subtract lightweight steel component own wt, stability and security.
In world wide, started the research climax that develops high-performance steel iron material of new generation at present, by alloy combination, design, reform controlled rolling/TMCP technology and thermal treatment process and obtain better microstructure coupling, thereby make steel plate obtain excellent strength-toughness more, strong plasticity coupling, low yield strength ratio, resistance to atmospheric corrosion, better weldability and anti-fatigue performance; Steel plate of the present invention adopts above-mentioned technology just, develops at low cost all weather-proof building structural Plate Steels of excellence of comprehensive mechanical property, welding property.
When prior art manufacture atmospheric corrosion resistance welded construction is used Plate Steel; generally in steel, add the weathering resistance alloying elements such as a certain amount of P, Ni, Cu, Cr; object is at surface of steel plate, to form the amorphous protective membrane of one deck densification, stops air to enter steel plate inside, reaches atmospheric corrosion resistance effect.Bring thus mother metal steel plate toughness, weldability, especially steel plate cold-forming property is poor, cannot meet the requirements such as whole plate length direction, whole plate width clod wash 90 degree machine-shapings; Japan adopts low C content Composition Design for this reason, add tiny alloying element Ti, Nb, in conjunction with controlled rolling technique, Plate Welding and low-temperature flexibility are greatly improved, (referring to < < iron research processed > >, 1982, Vol.309, P98; R & D Kobe Steel skill report, 1988, Vol.38, P97).
Weathering steel for the use of exploitation cold district, Japan adopts the micro-Ti of the low N-of the high Al-of low C-to process Composition Design technology, in conjunction with controlled rolling technique, successfully produce satisfied-40 ℃ low-temperature flexibility weather-resistant steel plate, (referring to < < iron と steel > >, 1985, Vol.71, S593).
But these steel plates do not relate to when cold-formed yet, whole plate length direction, width 90 degree clod wash machine-shapings; Secondly, the amplitude that Cr element significantly reduces the intensity of ferrite+pearlitic microstructure controlled rolling steel plate and reduces yield strength is greater than the amplitude that reduces tensile strength and (referring to < < Western Hills, commemorates technology lecture > > 86-87, there is larger difficulty in the high weather resistance steel plate that P11), adopts controlled rolling process to produce high working property, high tenacity; Simultaneously a large amount of patent documentations just illustrate the low-temperature flexibility that how to realize mother metal steel plate, for how under welding conditions, obtain good heat affected zone (HAZ) low-temperature flexibility and illustrate lessly, while especially adopting Large Heat Input Welding, how to guarantee that the low-temperature flexibility of heat affected zone (HAZ) is few.
Summary of the invention
The object of the present invention is to provide a kind of high tenacity, high weather resistance steel and manufacture method thereof, its yield strength >=355MPa, tensile strength >=490MPa, Charpy transverse impact merit (single the value) >=47J of-40 ℃, relative General Structural Steel corrosion rate≤20%, be suitable for being used as without application speed train cars body structure, and can realize low-cost stable suitability for industrialized production in batches.
For achieving the above object, technical scheme of the present invention is:
High tenacity, high cold worked high weather resistance steel plate are one of kinds that in slab product, difficulty is larger, its reason is that such steel plate not only requires ultralow C content and high strength, high-weatherability and good low-temperature flexibility and cold-formed property, and steel plate also will have good weldability, can under lowered in field environment, implement welding operation, quality of weld joint meets the requirement of high ferro to compartment; These performance requriementss are difficult to meet simultaneously.Ultralow C content and high strength are mutually conflicted between high-weatherability and good low-temperature flexibility and cold-formed property in Composition Design and technological design, are difficult to be in harmonious proportion, and while reducing C content, are difficult to realize the high strength of high weather resistance steel plate; When improving weathering resistance, be difficult to realize the good low-temperature flexibility of steel plate and cold-formed property; How the ultralow C content of balance and high strength, high-weatherability are one of high P content and low-temperature flexibility and cold-formed property difficult point that is this product maximum, are also key core technology; Therefore the present invention is in gordian technique route, composition and technological design, combine key factors such as affecting steel plate high tenacity, high-weatherability, high strength, high cold-formed property and steel plate weldability, creatively adopted the carbon manganese steel composition system of the high P content of the low Mn-of low C-as basis, adopt Cu+Ni+Cr alloying, control [%C]/[%P]>=0.49, [%Mn]/[%C]>=10, weathering resistance index D
nH>=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] than between being controlled at 1.0～3.0 and [%Ca] * [%S]
0.28≤ 0.002, adopt special TMCP technique, obtain good low-temperature flexibility, crooked cold working characteristic and high-weatherability steel plate, be particularly suitable for being used as without application speed train cars body structure, and can realize low-cost stable suitability for industrialized production in batches.
Concrete, high tenacity of the present invention, high weather resistance steel, its composition 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 Fe and are inevitably mingled with; And above-mentioned element must meet following relation simultaneously:
[%Mn]/[%C] >=10, with guarantee steel plate uniform crystal particles tiny and at-40 ℃ Charpy bar fracture fibre ratio at least higher than 50%;
[%C]/[%P] >=0.49, guarantees that abundant C atom segregation is on crystal boundary, suppresses P atom at Grain Boundary Segregation, prevents that intergranular flwrittle fracture pattern from occurring, and improves weather-resistant steel plate low-temperature flexibility and crooked cold working characteristic; This is one of key component design of the present invention.
Weathering resistance index D
nH>=6.5% and ([%Cu]+0.36[%Ni]+0.27[%Cr]) * [%P]>=0.03, guarantee that steel plate has high weathering resistance, weathering resistance index D
nH=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] than between being controlled at 1.0～3.0 and [%Ca] * [%S]
0.28≤ 0.002, guarantee that steel plate has high crooked cold working characteristic, be applicable to whole plate length direction, width 90 degree clod wash machine-shaping requirements, meet the cold-forming requirement of manufacturing high ferro railway car; This is also one of key component design of the present invention.
As everyone knows, carbon is very large on the impact of steel plate low-temperature flexibility, weldability, from improving low-temperature flexibility and the weldability angle of steel plate, wishes in steel that C content is lower to be advisable; But from the intensity of steel plate, prior unsuitable too low from TMCP process microstructures Control, C content, too low C content not only causes austenite grain boundary mobility high, and this brings larger problem to the even thinning microstructure of TMCP process, easily forms mixed grain structure; Too low C content also causes Grain-boundary Junctions to make a concerted effort to reduce simultaneously, and especially, under high P content condition, P is at Grain Boundary Segregation in aggravation, weakens Grain-boundary Junctions and makes a concerted effort, and causes steel plate low temperature intergranular flwrittle fracture; C content is higher than 0.09% time, not only molten steel solidification enters Peritectic Reaction district, causes the inner segregation of slab, surface crack to form probability and increase, especially under high P content condition, high C promotes the inner segregation of slab to be geometricprogression to be increased, severe exacerbation steel plate endoplasm and mechanical property; Comprehensive above factor, the content of C is controlled 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 desoxydatoin of Si is little, although Si can improve the intensity of steel plate, and low-temperature flexibility and the weldability of Si grievous injury steel plate, especially under high P content condition, Si promotes the inner segregation degree of slab to increase, severe exacerbation steel plate endoplasm and mechanical property, so the Si content in steel should be controlled lowly as far as possible, consider economy and the operability of steelmaking process, Si content is controlled at≤and 0.30%.
Mn as alloying element in steel plate except improving intensity and improving toughness, also there is the austenite of expansion phase region, reduce Ac
1, Ac
3, Ar
1, Ar
3point temperature, the effect of thinning microstructure crystal grain; Add-on is very few, and mixed crystal phenomenon even appears in steel plate coarse grains; Add too much Mn can increase the inner segregation degree of steel plate, reduce homogeneity and the low-temperature flexibility of mechanical property of steel plate, especially, under high P content condition, high Mn promotes the inner segregation of slab to be geometricprogression to be increased, severe exacerbation steel plate endoplasm and low-temperature flexibility; Consider above-mentioned factor, Mn content is controlled between 0.40%～0.80%.
P contributes maximum element to steel plate weathering resistance, but P is huge to the low-temperature impact toughness of steel plate, weldability infringement; For guaranteeing that steel plate has high-weatherability, the P that adds some amount in steel is inevitable; But can be by adding a certain amount of Cu, Cr in steel, Ni unit usually increases steel plate weathering resistance, Substitute For Partial substitutes P element and reduces P element addition, improves steel plate low-temperature flexibility and cold-workability; Therefore under the condition of comprehensive steel plate mechanical property, weldability and manufacturing cost, reasonably P content is controlled between 0.07%～0.11%.
S is very large as harmful low-temperature flexibility (especially laterally low-temperature flexibility), weathering resistance infringement being mingled with steel plate in steel, the more important thing is that S is combined with Mn in steel, form MnS inclusion, in course of hot rolling, the plasticity-of MnS makes MnS along rolling to extension, form along rolling to MnS inclusion band the horizontal low-temperature flexibility of grievous injury steel plate, Z-direction performance and clod wash processibility; Simultaneously S still casts, produces hot short principal element in course of hot rolling; Wish that in theory S content is more low better, but consider economy and the operability of steelmaking process, require S content be controlled at≤0.004%.
To steel plate weathering resistance, contribution is only second to P element to Cu element, and the Cu that adds some amount in high weather resistance steel is absolutely necessary; In addition, Cu, as austenite stabilizer element, can improve armor plate strength and less on the impact of steel plate low-temperature flexibility simultaneously; But while adding too much Cu (>=0.50%), especially, under high P content condition, at crystal boundary, form low melting point Cu
xp
yintermetallic 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, so Cu content is controlled between 0.20%～0.50%.
Xiang Gangzhong adds the Ni of some amount, also can improve steel plate weathering resistance; The more important thing is that in steel, adding Ni can prevent that copper brittleness from occurring, and reduces the thermal crack susceptibility of casting, hot rolling and welding process; In addition, Ni is that steel plate obtains the indispensable alloying element of good low-temperature flexibility; Therefore theoretically, in steel, Ni content is more high better within the specific limits, but Ni is very valuable alloying element, and from low cost batch production angle, suitable add-on is 0.10%～0.40%.
For high weather resistance steel, Cr element promotes that fine and close amorphous oxide layer effect is larger, and the Cr that adds some amount in high weather resistance steel is absolutely necessary; Add the Cr (≤0.70%) of some amount not damaging under the low-temperature flexibility and crooked cold worked condition of steel plate, improve the weathering resistance of steel plate; If but added Cr content very few (<0.40%), Cr would be less to the contribution of steel plate weathering resistance, does not reach high-weatherability requirement; Add too much (>0.70%), low-temperature flexibility and the crooked cold-workability of infringement steel plate; Therefore Cr content is controlled 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, generates that TiN number of particles is few, size is large, can not play to control the effect of steel plate crystal grain and improve steel plate low-temperature flexibility and weldability, on the contrary steel plate low-temperature flexibility and weldability is harmful to; But during N too high levels, in steel, freely [N] increases, especially under Large Heat Input Welding condition, heat affected zone (HAZ) free [N] content sharply increases, grievous injury HAZ low-temperature flexibility and crooked cold-workability, the processing service performance of deterioration steel.Therefore N content be controlled at≤0.0050%.
In steel, adding micro-Ti object is that N is combined in steel, generates the very high TiN particle of stability, suppresses steel plate crystal grain and welded H AZ district grain growth; The Ti content adding in steel will with steel in N containing flux matched, the principle of coupling is that TiN can not separate out and must in solid phase, separate out in liquid molten steel; Therefore the Precipitation Temperature of TiN must be guaranteed lower than 1400 ℃; Ti add-on very few (<0.008%) in steel, forms TiN number of particles not enough, is not enough to inhibiting grain growth and changes welded H AZ second-order phase transition product and improve low-temperature flexibility and the weldability of steel plate; While adding Ti content too much (>0.016%), TiN Precipitation Temperature is over 1400 ℃, part TiN particle is separated out large-sized TiN particle in solidification of molten steel process, and this large size TiN particle not only can not inhibiting grain growth, becomes on the contrary the starting point of crack initiation; Therefore the optimum controling range of Ti content is 0.008%～0.016%.
In steel, adding micro-Nb element object is to improve recrystallize to stop temperature, expands controlled rolling process window, carries out non-recrystallization controlled rolling, improves TMCP steel plate obdurability, improves TMCP steel plate cold working characteristic; When Nb addition is lower than 0.010% time, except the controlled rolling effect that can not effectively bring into play, also not enough to TMCP steel plate phase transformation strengthening ability; When Nb addition surpasses 0.030%, Nb improves the effect of steel plate low-temperature flexibility by controlled rolling and reaches capacity, and causes valuable Nb element resource waste, increase manufacturing cost, so Nb content is controlled at 0.015%～0.030%.
Steel is carried out to Ca processing, on the one hand can pure molten steel, on the other hand steel medium sulphide content is carried out to denaturing treatment, make it to become non deformable, stablize tiny spherical sulfide, the red brittleness that suppresses S, improves steel plate impelling strength and cold working characteristic, improves the anisotropy of steel plate mechanical property; The number of Ca add-on, the height that depends on S content in steel, Ca add-on is too low, and treatment effect is little, and Ca add-on 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 is pressed ACR=Ca[1-1.24 * O]/1.25 * S, wherein ACR is sulfide inclusion shape control index, be advisable, so the span of control of Ca content is 0.001%～0.004% between span 1.0～3.0.
According to the present invention, steel plate tissue is the bainite that evenly ferrite+perlite+disperse tiny and that comprise substructure distributes, and realizes high strength, high tenacity, high-weatherability and the good crooked cold working characteristic of steel plate.
The manufacture method of high tenacity of the present invention, high weather resistance steel, it comprises the steps:
1) smelt, cast
Press mentioned component smelting, continuous casting process, and adopt light Reduction Technology, Continuous Casting Soft Reduction amount is controlled between 3mm～8mm, 1535 ℃～1555 ℃ of basket pouring temperature, casting speed 0.7m/min～1.0m/min;
2) heating of plate blank, 1100 ℃～1200 ℃ of Heating temperatures, slab adopts high-pressure water descaling after coming out of the stove, and de-scaling is de-scaling not to the utmost repeatedly;
3) rolling
First stage is common rolling, adopts uninterrupted continuous rolling mode, guarantees that dynamically/Static Recrystallization, refine austenite crystal grain occur deformation metal;
Subordinate phase adopts the controlled rolling of austenite one phase district, 860 ℃～900 ℃ of controlled rolling start rolling temperatures, rolling pass draft >=7%, accumulative total draft >=60%, 780 ℃～820 ℃ of finishing temperatures;
4) cooling
After controlled rolling finishes, steel plate is transported to ACC equipment place immediately, and time of delivery≤30s accelerates cooling immediately to steel plate; Steel plate is opened 770 ℃～810 ℃ of cold temperature, speed of cooling >=10 ℃/s, stop cold temperature and be≤400 ℃, to stop that cold temperature and speed of cooling set be one of gordian technique of the present invention to steel plate natural air cooling to room temperature subsequently, speed of cooling >=10 ℃/s, stop cold temperature and be≤400 ℃, can fully suppress the high weather resistance steel plate P of high P content at Grain Boundary Segregation, cause steel plate intergranular flwrittle fracture, improve steel plate low-temperature flexibility and crooked cold-workability; This is one of critical process design of the present invention.
In order to obtain good cold-forming property, it is necessary reducing C content and other alloying element contents, and especially, under high P content condition, adopting Ultra-low carbon, low-carbon-equivalent design is unique selection; But Ultra-low carbon, low-carbon-equivalent design will cause armor plate strength not enough, therefore adopt bainite strengthening essential, in order to obtain bainite structure, must adopt and roll rear accelerated cooling process, guarantee to obtain bainite structure; Secondly, under high P content condition, in order to obtain good low-temperature flexibility, crystal grain thinning is unique selection, therefore must adopt controlled rolling technique, guarantees grain refining; Comprehensive above-mentioned 2 contents, in the composition range of above-mentioned design, adopt TMCP technique (be controlled rolling+accelerate cooling), obtain the bainite that ferrite+perlite+disperse of comprising substructure distributes, realize the high cold working characteristic of high P content steel plate and good low-temperature flexibility.
The invention has the beneficial effects as follows:
The present invention adopts alloying element unitized design to combine with special TMCP technique, improve to greatest extent the potential that alloying element P, Cu, Ni, Cr improve weather resisteant and comprehensive mechanical property (especially tensile strength and low-temperature flexibility), reduced the consumption of ton steel precious alloy element Cu, Ni, Cr; And by special TMCP technology generations, for thermal treatment process, reduced manufacturing process, shortened the manufacturing cycle; Steel plate has obtained high strength, high tenacity, high-weatherability and good crooked cold working characteristic, is particularly suitable for manufacturing speed train cars housing, and can realize low-cost stable suitability for industrialized production in batches; The present invention not only significantly reduces precious resource consumption, reduces manufacturing cost, has shortened the manufacturing cycle, has also eliminated the difficulty of a large amount of steel scrap recyclings containing Cu, Ni simultaneously, realizes the environmental protection of manufacturing processed; Steel plate end-of-development of the present invention high ferro train tank material from method, moral import situation, filled up domestic blank.
Accompanying drawing explanation
Fig. 1 is the microstructure (1/4 thickness place) of embodiment of the present invention steel 5.
Embodiment
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 (adopting light soft reduction process) → slab finishing → slab scale fire that rolls off the production line is cut → heat → TMCP → steel plate slow cooling → AUT/MUT → swarf, crop end → sampling and performance test → cut scale steel plate → surface quality and apparent size, sign and detection → dispatch from the factory.
Referring to Fig. 1, it is depicted as the microstructure of the embodiment of the present invention 5 steel plates, it is the bainite that evenly ferrite+perlite+disperse tiny and that comprise substructure distributes, and has realized high strength, high tenacity, high-weatherability and the good crooked cold working characteristic of steel plate.
The present invention is according to steel plate technical characterstic, unitized design by rational alloying element combines with special TMCP technique, steel plate has obtained high strength, high tenacity and good crooked cold working characteristic, thus improve member safe reliability, time of having shortened the manufacture of user's member with difficulty, saved the cost that user's member is manufactured; The height of steel plate is weather-proof without coating, greatly reduces user's maintenance, use cost, has extended member and has been on active service the cycle, for user has created huge value; Thereby this type of steel plate is the product of high added value, green environmental protection; Owing to not needing to add any equipment in Plate Production process of the present invention, manufacturing process is succinct, production process is controlled easily, therefore cheap for manufacturing cost, has very high performance-price ratio and the market competitiveness; And technological adaptability is strong, can promote to all Heavy Plate Production producers with acceleration cooling apparatus, 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 more and more comes into one's own, the rigid binding target of environmental protection will expand to infrastructure project project gradually, as environmental type high-performance weather-proof vehicle, with High Strength Steel Plate, have wide market outlook.At present Baogang Stocks Trading Co.'s Thick Plate Plant successfully adopts that low-cost, the stable high ferro train special use of producing in bulk high comprehensive performance of this technology is high-strength, the high weather resistance steel plate of high-ductility, first batch of 150 tons of high weather resistance steel plates, for high ferro engineering project, are manufactured high-speed train end structure in Nanjing carshop.
Claims (2)
1. high tenacity, a high weather resistance steel, its composition 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 Fe and are inevitably mingled with; And above-mentioned element must meet following relation simultaneously:
[%Mn]/[%C]≥10；
[%C]/[%P]≥0.49，
Weathering resistance index D
nH>=6.5%,
（[%Cu]+0.36[%Ni]+0.27[%Cr])×[%P]）≥0.03，
Weathering resistance index D
nH=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] be than being controlled between 1.0～3.0, [%Ca] * [%S]
0.28≤ 0.002, the steel plate tissue of acquisition is the bainite that evenly ferrite+perlite+disperse tiny and that comprise substructure distributes.
2. the manufacture method of high tenacity as claimed in claim 1, high weather resistance steel, it comprises the steps:
1) smelt, cast
Press mentioned component smelting, continuous casting process, and adopt light Reduction Technology, Continuous Casting Soft Reduction amount is controlled between 3mm～8mm, 1535 ℃～1555 ℃ of basket pouring temperature, casting speed 0.7m/min～1.0m/min;
2) heating of plate blank, 1100 ℃～1200 ℃ of Heating temperatures, slab adopts high-pressure water descaling after coming out of the stove, and de-scaling is de-scaling not to the utmost repeatedly;
3) rolling
First stage is common rolling, adopts uninterrupted continuous rolling mode, guarantees that dynamically/Static Recrystallization, refine austenite crystal grain occur deformation metal;
Subordinate phase adopts the controlled rolling of austenite one phase district, 860 ℃～900 ℃ of controlled rolling start rolling temperatures, rolling pass draft >=7%, accumulative total draft >=60%, 780 ℃～820 ℃ of finishing temperatures;
4) cooling
After controlled rolling finishes, steel plate is transported to ACC equipment place immediately, and time of delivery≤30s accelerates cooling immediately to steel plate; Steel plate is opened 770 ℃～810 ℃ of cold temperature, and speed of cooling >=10 ℃/s, stops cold temperature and be≤400 ℃, and steel plate natural air cooling is to room temperature subsequently.
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| CN109576576A (en) * | 2018-11-22 | 2019-04-05 | 包头钢铁（集团）有限责任公司 | A kind of railcar of rare earth treatment Q450NQR1 fashioned iron and preparation method thereof |
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| CN105154784A (en) * | 2015-10-08 | 2015-12-16 | 山东钢铁股份有限公司 | High-phosphorus steel plate of weather-proof structure and method for preparing steel plate |
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| CN108103398A (en) * | 2017-12-07 | 2018-06-01 | 新疆八钢铁股份有限公司 | A kind of 460Mpa grade high-strengths high durable steel plate and its production method |
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| CN111057968A (en) * | 2019-12-19 | 2020-04-24 | 钢铁研究总院 | Corrosion-resistant hot-rolled steel plate for street lamp pole and preparation method thereof |
| CN111057968B (en) * | 2019-12-19 | 2021-03-30 | 钢铁研究总院 | Corrosion-resistant hot-rolled steel plate for street lamp pole and preparation method thereof |
| CN115090844A (en) * | 2022-05-06 | 2022-09-23 | 包头钢铁（集团）有限责任公司 | Casting method for reducing copper brittle cracks of weathering steel |
| CN115090844B (en) * | 2022-05-06 | 2023-08-08 | 包头钢铁（集团）有限责任公司 | Casting method for relieving copper brittle cracks of weathering steel |
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