CN103290335A - High-strength and high-corrosion-resistance steel plate material with yield strength of 900 MPa and production method thereof - Google Patents
High-strength and high-corrosion-resistance steel plate material with yield strength of 900 MPa and production method thereof Download PDFInfo
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Abstract
The invention relates to a high-strength and high-corrosion-resistance steel plate material with the yield strength of 900 MPa and a production method thereof. The steel plate material with the yield strength of 900 MPa contains the following chemical ingredients in percentage by weight: 0.002-0.0045% of C, 0.15-0.25% of Si, 0.1-0.9% of Mn, not higher than 0.012% of P, not higher than 0.008% of S, 0.25-0.5% of Cu, 2.80-4.0% of Cr, 0.12-0.35% of Ni, 0.01-0.05% of Al, 0.015-0.040% of Nb, 0.01-0.02% of Ti, 0.008-0.013% of V and the balance of Fe and unavoidable impurity elements. The hot-rolled continuous casting billet heating temperature is 1,200-1,250 DEG C, the initial rough rolling temperature is above 1,110 DEG C, the initial fine rolling temperature is 1,110-960 DEG C, the final rolling temperature is 980-830 DEG C, and the coiling temperature is 550-650 DEG C; and according to the steel plate material disclosed by the invention, the yield strength is not lower than 900 MPa, the tensile strength is not lower than 1,050 MPa, the elongation percentage is higher than 15%, and the atmospheric-corrosion-resisting relative corrosion rate is below 30% of Q345B. The steel plate material disclosed by the invention is high in atmospheric corrosion resistance, strong in toughness and good in comprehensive performance, and has good low temperature impact resistance and weldability.
Description
Technical field
The present invention relates to highly corrosion resistant performance steel, relate in particular to high strength highly corrosion resistant performance steel board, or other high strength highly corrosion resistant performance steel hot-rolled sheet material, be specially adapted to high strength highly corrosion resistant performance rail truck weathering steel, engineering machinery and engineering are used steel, are specifically related to high strength highly corrosion resistant performance steel board and the production method thereof of a kind of yield strength 900MPa.
Background technology
In several years of past, each lorry is newly made C70 type open-top car, P70 type box car, G70 tank car L70 type foodstuff hopper wagon and the various container flat car of main lorry product for adopting the Q450NQR1 high-strength weathering steel to make that factory produces in enormous quantities, the C80B type stainless steel fortune coal open-top car that employing T4003 ferritic stainless steel is made etc.
The novel weathering resistant steel of present research and development, on the basis of existing Q450NQR1 high-strength weathering steel, keep mechanical property constant substantially, the high anti-corrosion type weathering steel S450EW that corrosion resistance nature doubles, passed through the technological audit meeting of equipment department's tissue in October, 2010, and trial-production part sample car, on-line running.
The possibility direction in future of China's railway cargo vehicles: the Ministry of Railways roughly may take three kinds of schemes to realize according to the requirement of the national 12 5,000,000,000 freight tonne kilometres/a transportcapacities of planning:
1. build the weight-carrying ability of heavy-haul line: 〉=80-120t again, speed of a motor vehicle 120km/h;
2. existing line: realize heavy duty fast ,≤90t, speed of a motor vehicle 120km/h;
3. existing high speed passenger transportation circuit: run the high speed light loading lorry, speed 160km/h, load-carrying 60-70t.
Following most possible direction is the fast heavily loaded of existing line, replaces present C70 and light-weighted quick and three directions of high speed with C80.
Adopt weathering steel rather than stainless steel to produce C80, C80 most possibly adopts the manufacturing of S450EW weathering steel.
Along with the fast development of China Railway, railway freight-car heavy duty speed-raising loss of weight improves supporting capacity and be the direction of railway freight-car work-ing life, and so just there is potential demand in the weathering steel to high-strength and high-weather-resistance.
Engineering and engineering machinery field if be extensive use of the weathering steel of high-strength and high-weather-resistance, not only can improve work-ing life, and can reduce maintenance cost, and a large amount of weathering steels that adopt of society can improve social benefit greatly.
Up to the present, the patent application of the weathering steel of domestic high-strength and high-weather-resistance is:
The disclosed patent table look-up of the high anti-corrosion type weathering steel of table 1
The patent of patent No. Zl200810197846.3 has been introduced a kind of yield strength greater than 550MPa grade ultra-low-carbon weathering steel, has good welding property and low temperature impact properties, but has added Mo, and cost improves greatly; Simultaneously, the weathering steel of this patent does not have the high-weatherability that erosion rate is lower than Q345B 30%.
The patent of patent No. Zl200810304030.6, a kind of high-strength atmospheric corrosion resistant hot-rolled strip steel and production method thereof have been introduced, have over-all propertieies such as high-strength high-plasticity low yield strength ratio, but yield strengths such as this steel grade are 450MPa, yield strength is greater than 550MPa grade ultra-low-carbon weathering steel, have good welding property and low temperature impact properties, intensity rank is low; Simultaneously, the weathering steel of this patent does not have the high-weatherability that erosion rate is lower than Q345B 30%.
The patent of patent No. Zl200910301054.0, a kind of high-strength weather resisting steel and production method thereof have been introduced, this patent has been added V (0.09-0.15%) especially, cost increases, welding property and low temperature impact properties have been worsened simultaneously, simultaneously, the weathering steel of this patent does not have the high-weatherability that erosion rate is lower than Q345B 30%.
The patent of patent No. Zl200510111858.6, a kind of air corrosion resisting high strength low alloy metal and production method thereof have been introduced, added Nb (≤0.07%) in this patent, Ti (≤0.25%) and Mo (≤0.35%) two kinds or two or more, Nb and Mo content height, the cost height. simultaneously, the weathering steel of this patent does not have the high anti-corrosion that erosion rate is lower than Q345B 30%.
The patent of patent No. Zl200710045329.X, a kind of high-corrosion resistant high-strength weathering steel and manufacture method thereof have been introduced, this patent steel grade yield strength is that 700MPa. has the high anti-corrosion that erosion rate is lower than Q345B 30%. but added the Cr of 4.5-5.0% in this patent, Cr content is very high, and cost improves and smelts difficulty and increases.
The patent of patent No. Zl200610125365.2 has been introduced a kind of high-strength weathering steel and production method thereof, and this steel grade has high strength, excellence but low-temperature impact toughness, but unit elongation is on the low side, and having added Mo (0.10%-0.40%), cost increases; Simultaneously, process using quenching+tempering hardening and tempering process has prolonged the production cycle. and simultaneously, the weathering steel of this patent does not have the high-weatherability that erosion rate is lower than Q345B 30%.
In addition, also have 2006, patent No. publication number is CN1718832A, has the low temperature high toughness weather corrosion resistant steel of 600MPa level and the patent of manufacture method thereof; Patent No. publication number is CN1800428A, a kind of economy type weathering-resistant steel; Patent No. publication number is CN1609257A, acicular structure high strength weathering steel and manufacture method thereof etc.
Abroad: the patent of patent No. US6066833, a kind of high strength low yield ratio weathering resistant steel and production method (Thermomechanically controlled processed high strength weathering steel with low yield/tensile ratio) thereof that adopts the controlled rolling and cooling method to produce, this steel grade yield strength is 483-518MPa, yield tensile ratio is less than 0.85, this patent adopts the Nb-Ti-Mo microalloying, also added the route of the microalloying that the V. of 0.06%-0.14% adopts especially, the cost of Zeng Jiaing not only, and welding property and low temperature impact properties deterioration, yield strength is also about the highest 520MPa.
High intensity high corrosion resistance type weathering steel
Composition design: the composition range that provides from each patent, it is base that the high anti-corrosion type weathering steel composition of yield strength 460MPa ~ 700MPa adopts low-carbon (LC) (or Ultra-low carbon)-silicon manganese steel, add proper C u, Ni, Cr, wherein Cr content is compared existing weathering steel SPA-H or the Q450NQR1 steel increases substantially, the part steel has added micro-Nb, Ti alloy, the part steel has carried out adding rare earth in Ca processing or the steel, guarantees low S, low N content and hangs down P content.
Number of patent application is the other compositions of 201010022912.0 460 MPa grade yield strengths
Number of patent application is that the 460MPa level high anti-corrosion weathering steel composition proportion of 201010022912.0 applications is (Wt): C:0.01 ~ 0.06, Si:0.1 ~ 0.4, Mn:0.2 ~ 0.8, P :≤0.01, S :≤0.006, Cu:0.2 ~ 0.5, Cr:2.5 ~ 7.0, Ni:0.2 ~ 1.2, Al:0.01 ~ 0.05, N :≤0.005, Ti:0.01 ~ 0.10, surplus is Fe and unavoidable impurities, to the industrial S450EW(450MPa level of Baosteel) hot-rolled sheet chemical ingredients spectral detection in kind result, each element component content is all in the mentioned component ratio range, but also added the Nb about 0.03Wt%, and carried out the Ca processing.
Number of patent application is 200910056603.2; 201010125410.0 and 201010291603.3 yield strength 550MPa rank compositions
Number of patent application is that the 550MPa level high anti-corrosion weathering steel composition proportion of 200910056603.2 applications is (Wt): C:0.02 ~ 0.08, Si:0.15 ~ 0.55, Mn:0.2 ~ 1.0, P :≤0.01, S :≤0.006, Cu:0.2 ~ 0.5, Cr:2.5 ~ 7.0, Ni:0.2 ~ 1.2, Al:0.01 ~ 0.05, N :≤0.005, Ti:0.01 ~ 0.10, Nb:0.02 ~ 0.06 surplus is Fe and unavoidable impurities, compare with the high anti-corrosion type weathering steel of its 460 MPa grade yield strength, yield strength 550MPa level composition design change is mainly: on the basis of 460MPa composition design, C element bound, Si element bound, the Mn upper limit slightly improves, and has increased 0.02 ~ 0.06% Nb.
Number of patent application is that the 550MPa level high anti-corrosion weathering steel composition proportion of 201010125410.0 applications is (Wt): C:0.001 ~ 0.004, Si:0.10 ~ 0.30, Mn:0.40 ~ 0.70, P :≤0.02, S :≤0.008, Cu:0.25 ~ 0.50, Cr:2.50 ~ 3.50, Ni:0.20 ~ 0.40, Al:0.02 ~ 0.06, N:0.001 ~ 0.005, Ti:0.01 ~ 0.03, Nb:0.01 ~ 0.03, Re:0.01 ~ 0.03, Ca:0.001 ~ 0.004, surplus is Fe and unavoidable impurities element.
Number of patent application is that the 550MPa level high anti-corrosion weathering steel composition proportion of 201010291603.3 applications is (Wt%): C:0.001 ~ 0.0065, Si:0.10 ~ 0.50, Mn:0.20 ~ 0.60, P :≤0.015, S :≤0.008, Cu:0.25 ~ 0.60, Cr:2.15 ~ 4.0, Ni:0.12 ~ 1.0, Al:0.01 ~ 0.05, N:0.001 ~ 0.005, Ti:0.005 ~ 0.05, Nb:0.01 ~ 0.08, Re:0.01 ~ 0.03, surplus are Fe and unavoidable impurities element.
Number of patent application is 200910056602.8 and the other composition of 200710045329.X Yield strength 700 MPa grade
Number of patent application be 200910056602.8 and the Yield strength 700 MPa grade weathering steel of 200710045329.X application low-carbon (LC) and the low two kinds of composition design systems of manganese of Ultra-low carbon are arranged:
(1) first kind of composition system (low-carbon (LC)) number of patent application is 200910056602.8: composition proportion is (Wt): C:0.02 ~ 0.10, Si:0.10 ~ 0.40, Mn:0.3 ~ 1.3, P :≤0.01, S :≤0.006, Cu:0.2 ~ 0.5, Cr:2.5 ~ 10.0, Ni:0.2 ~ 1.0, Al:0.01 ~ 0.05, N :≤0.005, Ti:0.02 ~ 0.10, Nb:0.02 ~ 0.06 surplus is Fe and unavoidable impurities, compare with the high anti-corrosion type weathering steel composition design of its 550MPa level, this 700MPa level composition design change is mainly: on the basis of 460MPa level composition design, the C element upper limit, the Mn bound, the Cr element upper limit, Ti element lower limit slightly improves, and Si element bound and the Ni element upper limit slightly descend.
(2) second kinds of composition systems (Ultra-low carbon is hanged down manganese) number of patent application is 200710045329.X: composition proportion is (Wt): C:0.002 ~ 0.005, Si:0.20 ~ 0.40, Mn:0.01 ~ 0.05, P :≤0.020, S :≤0.008, Cu:0.2 ~ 0.4, Cr:4.50 ~ 5.50, Ni:0.10 ~ 0.40, Al:0.01 ~ 0.05, N:0.01 ~ 0.006, Ti:0.01 ~ 0.03, surplus are Fe and unavoidable impurities element.
Number of patent application is that the patent operational path of the 550MPa level high anti-corrosion weathering steel of 201010125410.0 applications is: electrosmelting → refining → sheet billet continuous casting → slab reheat → controlled rolling → control is cooled off → is batched → finishing.Different with operational path of the present invention.
The chemical ingredients of each patent of table 2
The hot rolling technology main points that each patent of table 3 provides
The mechanical property of the case study on implementation steel that each patent of table 4 provides
The corrosion resistance nature of the case study on implementation steel that each patent of table 5 provides
Up to the present, it is 200910056602.8 and the patent application of 200710045329.X that the weathering steel of the economy of other high-corrosion resistant high-strength of Yield strength 700 MPa grade has only number of patent application. two patents all adopt constituent contents such as high Cr, manufacturing cost is higher, and the production difficulty is bigger.
And the weathering steel of other high-corrosion resistant high-strength of yield strength 900MPa level does not have patent application.
In order to overcome shortcomings and deficiencies that prior art exists and the vacancy of product, the object of the invention just provides a kind of weathering steel and technical manufacture method that is easy to actual production thereof of economy of other high-corrosion resistant high-strength of yield strength 900MPa level, reduces manufacturing cost.
Summary of the invention
The object of the present invention is to provide high strength highly corrosion resistant performance steel board and the production method thereof of a kind of yield strength 900MPa, simultaneously, in order to form the high-intensity weathering steel series of high anti-big cavitation erosion, form 450 with the patent application of the weathering steel of the weathering steel of other high-corrosion resistant high-strength of yield strength 450MPa level of our unit and other high-corrosion resistant high-strength of yield strength 900MPa level is common, 700 and the series of the weathering steel of other high-corrosion resistant high-strength of 900MPa level, better services economic construction and user.
Concrete technical scheme is as follows:
The high strength highly corrosion resistant performance steel board of a kind of yield strength 900MPa, by mass percentage, its composition proportion is: C:0.002 ~ 0.0045, Si:0.15 ~ 0.25, Mn:0.1 ~ 0.9, P :≤0.012, S :≤0.008, Cu:0.25 ~ 0.5, Cr:2.80 ~ 4.0, Ni:0.12 ~ 0.35, Al:0.01 ~ 0.05, Nb:0.015 ~ 0.040, Ti:0.01 ~ 0.02, V:0.008 ~ 0.013, surplus are Fe and unavoidable impurities element.
Further, the relative erosion rate of resistance to atmospheric corrosion is below 30% of Q345B, yield strength 〉=900MPa, and tensile strength 〉=1050MPa, unit elongation is more than 15%.
Further, adopt following steps:
(1) converter smelting;
(2) continuous casting;
(3) hot continuous rolling;
(4) laminar flow cooling;
(5) batch.
Further, in the step (1), in the converter operation, C content is controlled under 300PPm, and O content is controlled under 400PPm, and Cr content reaches 1.5 ~ 2.0%.
Further, in the step (1), C, O, the composition outside the Cr is finished at refining procedure.
Further, in the step (2), continuously cast bloom adopts hot charging or cold charge.
Further, if hot charging, the hot charging temperature of hot charging continuously cast bloom is not less than 580 ℃, if cold charge, continuously cast bloom needs insulating ring cold, and holding temperature is not less than 580 ℃, and ring is as cold as room temperature then;
Perhaps,
When steel plate thickness≤8.0mm, can adopt two sections coolings or directly be cooled to 610 ~ 630 ℃, batch then.
Further, in the step (3),
During hot rolling, guarantee the abundant austenitizing of continuously cast bloom, the abundant solid solution of micro alloying element, 1200 ~ 1250 ℃ of Heating temperatures;
Be divided into roughing and finish rolling in rolling, 1100 ~ 1200 ℃ of roughing start rolling temperatures, 1110 ~ 960 ℃ of finish rolling start rolling temperatures, 980-830 ℃ of finishing temperature start rolling temperature;
Controlled rolling and cooling requires to have 3 percentage pass reductions more than 930 ℃ at least more than 35%.
Further, in the step (4), the mode of segmentation cooling is adopted in the laminar flow cooling, and leading portion is cooled to 690 ~ 730 ℃, 10 ~ 20 ℃/s of rate of cooling, and air cooling 10 ~ 15s cools off with back segment more then, and 10 ~ 15 ℃/s of rate of cooling is cooled to coiling temperature; Perhaps intuition adopts the coiling temperature that is cooled to of 10 ~ 15 ℃/s of rate of cooling.
Further, the middle coiling temperature of step (5) is 550 ~ 650 ℃.
Steel grade of the present invention: satisfy: yield strength is the high strength of 900MPa, high anti-corrosion: erosion rate, the weathering steel of this patent has the high anti-corrosion that relative erosion rate is lower than Q345B 30%.
Overall design philosophy: steel grade design and the difficult point that realizes are 1. corrosion resistance natures; 2. high strength; 3. high strength and deep drawing quality requirement; 4. the over-all properties of high strength and corrosion resistance nature; 5. the extension and the punching performance that use of user; 6. the high crack sensitivity of this steel grade.So overall design philosophy is: 1. the comprehensive mechanical performance that satisfies corrosion resistance nature, high strength, high strength and deep drawing quality requirement, high strength and corrosion resistance nature; 2. consider to prevent and evade the high crack sensitivity of actual production process; 3. satisfy the high crack sensitivity of extension, punching performance, welding property and this steel grade of user's use; 4. economic rationality and benefit.
Composition design philosophy: 1. consider to adopt the thinking of ferritic stainless steel, to satisfy the requirement of corrosion resistance nature; 2. consider to prevent and evade the high crack sensitivity of actual production process; 3. slot milling realizes that build up and microalloying design realize precipitation strength, thereby guarantees the requirement of product mechanical property.
Organize design philosophy: a pair of composition design contradiction of one of difficult point of this steel grade erosion resistance and assurance mechanical property so composition design first-selection satisfies the corrosion resistance nature requirement, guarantees that mechanical property requires then to adopt build up and precipitation strength.Organize design philosophy to be: to adopt ferrite+bainite or ferrite+island martensite body.Adopt heterogeneity design, TMCP technology, temperature schedule, rolling pattern and roll the back cooling, obtain the ferrite+bainite duplex structure of different bainite content, 2. pilot scale designs ferrite+island martensite body: adopt heterogeneity design, TMCP technology, temperature schedule, rolling pattern and roll the back cooling,, obtain the ferrite+island martensite body duplex structure of different island martensite body burdens.
Rolling design philosophy: 1. adopt different TMCP technology; 2. different back cooling schemes that roll; 3. different temperature schedule; 4. different rolling pattern.
Compare with present prior art, high strength highly corrosion resistant performance steel board of the present invention is because intensity improves, can save steel, reduce laid down cost, the highly corrosion resistant performance, improve the work-ing life of product, reduce and safeguard, reduce maintenance cost, save human cost, the service efficiency of raising equipment or equipment, save social cost simultaneously, economize on resources, increase the social total benefit.
Simultaneously, in order to form the high-intensity weathering steel series of high anti-big cavitation erosion, form 450 with the patent application of the weathering steel of the weathering steel of other high-corrosion resistant high-strength of yield strength 4500MPa level of our unit and other high-corrosion resistant high-strength of Yield strength 700 MPa grade is common, 700 and the series of the weathering steel of other high-corrosion resistant high-strength of 900MPa level, better services economic construction and user.
Embodiment
Describe the present invention below, it is a kind of preferred embodiment in the numerous embodiments of the present invention.
The composition design
The composition proportion of yield strength 900MPa is (Wt): C:0.002 ~ 0.0045, Si:0.15 ~ 0.25, Mn:0.1 ~ 0.9, P :≤0.012, S :≤0.008, Cu:0.25 ~ 0.5, Cr:2.80 ~ 4.0, Ni:0.12 ~ 0.35, Al:0.01 ~ 0.05, Nb:0.015 ~ 0.040, Ti:0.01 ~ 0.02, V:0.008 ~ 0.013, surplus are Fe and unavoidable impurities element.
The main foundation of composition design is as follows:
(1) adopting low-carbon (LC) or Ultra-low carbon purpose of design is to have limited the formation of pearlitic structure or other carbide, guarantees that the microstructure of steel is equal phase constitution, has avoided the potential difference between the out-phase to cause galvanic corrosion, to improve the corrosive nature of steel;
(2) an amount of Si content because Si has higher solid solubility in steel, can increase steel grade ferrite volume fraction, crystal grain thinning, thereby be conducive to improve toughness, too high levels can cause welding property to descend;
(3) an amount of Mn content, Mn has stronger solution strengthening effect, can significantly reduce the transformation temperature of steel simultaneously, the microstructure of refinement steel, be important highly malleablized element, but Mn content too much makes hardening capacity increase, thereby cause weldability and welding heat influence area toughness to worsen;
(4) low S, P content, S will worsen the atmospheric corrosion resistance of steel, and P can effectively improve the atmospheric corrosion resistance of steel, but the P too high levels can reduce toughness and the plasticity of steel, and P easily causes segregation simultaneously;
(5) Al, Al are the reductors that adds in the steel, add an amount of Al and are conducive to crystal grain thinning, improve the toughness and tenacity of steel;
(6) Cr, Cr has significant effect to the passivation ability that improves steel, can promote the steel surface to form fine and close passive film or protectiveness rusty scale, its enrichment in rusty scale can effectively improve rusty scale to the selective permeation characteristic of corrosive medium, studies show that, when Cr content in the steel alloy surpasses more than 3.0%, the atmospheric corrosion resistance of steel is expected to double;
(7) Ni, Ni improve intensity to improve the element of toughness simultaneously, and can improve hardening capacity, the hot-short check crack that causes that can effectively stop Cu is because Ni is noble element, for cost consideration, and too high Ni can improve the adhesivity of oxide skin, is pressed in the steel and can forms the hot rolling defective on the surface;
(8) Cu, Cu and Ni act on identical substantially, and solid solution and precipitation strength effect are arranged, and with the suitable proportioning of Ni, can significantly improve the atmospheric corrosion resistance of steel, but too high unfavorable to welding, and check crack easily takes place during hot rolling;
(9) N, N can reduce toughness and the welding property of steel, therefore guarantee low N content;
(10) Ti, a spot of Ti grow up for the austenite crystal that suppresses in the slab reheat process, suppress ferrite crystal grain simultaneously and grow up in recrystallize controlled rolling process, improve the toughness of steel;
(11) Nb, Nb are carbide forming elements, the fine carbide particle energy thinning microstructure of formation, and produce the precipitation strength effect, significantly improve the intensity of steel plate, but the welding property of more Nb is unfavorable;
Technical process is: converter smelting-continuous casting-hot continuous rolling-laminar flow cools off-batches.Further:
1) converter operation: converter operation C content is controlled under 300PPm, and O content is controlled under 400PPm, and Cr content reaches 1.5 ~ 2.0%, and remaining composition is finished at refining procedure;
2) continuously cast bloom can carry out hot charging or cold charge, if cold charge, continuously cast bloom needs insulating ring cold;
3) hot rolling: guarantee the abundant austenitizing of continuously cast bloom, the abundant solid solution of micro alloying element, 1200 ~ 1250 ℃ of Heating temperatures;
4) rolling:
Roughing: 1100 ~ 1200 ℃ of start rolling temperatures;
Finish rolling: 1110 ~ 960 ℃ of start rolling temperatures, 980 ~ 830 ℃ of finishing temperature start rolling temperatures;
5) rolling: controlled rolling and cooling, in order to guarantee homogeneous microstructure, thereby guaranteed performance is even, requires to have at least more than 930 ℃ 3 percentage pass reductions more than 35%.
6) laminar flow cooling
The laminar flow cooling is carried out in rolling end, adopts the mode of segmentation cooling, and leading portion is cooled to 690 ~ 730 ℃, 10 ~ 20 ℃/s of rate of cooling, and air cooling 10 ~ 15s cools off with back segment more then, and 10 ~ 15 ℃/s of rate of cooling is cooled to coiling temperature; Perhaps directly adopt the coiling temperature that is cooled to of 10 ~ 15 ℃/s of rate of cooling;
6) coiling temperature: 550-650 ℃.
Continuously cast bloom adopts hot charging or cold charge, and the hot charging temperature of hot charging continuously cast bloom is not less than 580 ℃; Cold charge: continuously cast bloom must adopt insulating ring cold, and holding temperature is not less than 580 ℃, and ring is as cold as room temperature then.
When steel plate thickness≤8.0mm, can adopt two sections coolings or directly be cooled to 610 ~ 630 ℃, batch then.
A kind of yield strength 900MPa erosion rate is the manufacture method of the high strength highly corrosion resistant performance steel board below 30% of Q345B.Its chemical ingredients by mass percentage, the composition proportion of yield strength 900MPa is (Wt): C:0.002 ~ 0.0045, Si:0.15 ~ 0.25, Mn:0.1 ~ 0.9, P :≤0.012, S :≤0.008, Cu:0.25 ~ 0.5, Cr:2.80 ~ 4.0, Ni:0.12 ~ 0.35, Al:0.01 ~ 0.05, Nb:0.015 ~ 0.040, Ti:0.01 ~ 0.02, V:0.008 ~ 0.013, surplus are Fe and unavoidable impurities element.
Technical process is: converter smelting-continuous casting-hot continuous rolling-laminar flow cools off-batches.Further:
1) converter operation: converter operation C content is controlled under 300PPm, and O content is controlled under 400PPm, and Cr content reaches 1.5 ~ 2.0%, and remaining composition is finished at refining procedure;
2) continuously cast bloom can carry out hot charging or cold charge, if cold charge, continuously cast bloom needs insulating ring cold;
3) hot rolling: guarantee the abundant austenitizing of continuously cast bloom, the abundant solid solution of micro alloying element, 1200 ~ 1250 ℃ of Heating temperatures;
4) rolling:
Roughing: 1100 ~ 1200 ℃ of start rolling temperatures;
Finish rolling: 1110 ~ 960 ℃ of start rolling temperatures, 980 ~ 830 ℃ of finishing temperature start rolling temperatures;
6) laminar flow cooling
The laminar flow cooling is carried out in rolling end, adopts the mode of segmentation cooling, and leading portion is cooled to 690 ~ 730 ℃, 10 ~ 20 ℃/s of rate of cooling, and air cooling 10 ~ 15s cools off with back segment more then, and 10 ~ 15 ℃/s of rate of cooling is cooled to coiling temperature; Perhaps intuition adopts the coiling temperature that is cooled to of 10 ~ 15 ℃/s of rate of cooling;
6) coiling temperature: 550 ~ 650 ℃.
Continuously cast bloom adopts hot charging or cold charge, and the hot charging temperature of hot charging continuously cast bloom is not less than 580 ℃; Cold charge: continuously cast bloom must adopt insulating ring cold, and holding temperature is not less than 580 ℃, and ring is as cold as room temperature then.
When steel plate thickness≤8.0mm, can adopt two sections coolings or directly be cooled to 610 ~ 630 ℃, batch then.
Preferred embodiment 1:
(1) technical process: converter smelting-continuous casting-hot continuous rolling-laminar flow cools off-batches.
(2) chemical ingredients: main chemical compositions sees Table 1;
(3) rolling technology: the hot rolling main technologic parameters sees Table 2;
Steel plate finished product mechanical property sees Table 3.
Soak into corrosion test method TB/T2375-93 according to railway with the weathering steel cycle and carry out 72 hours periods infiltration corrosion test, adopt Q345B straight carbon steel and horse steel high-strength weathering steel Q450NQR1 to be the test comparative sample, the atmospheric corrosion resistance test result sees Table 4.
Preferred embodiment 2:
(1) technical process: converter smelting-continuous casting-hot continuous rolling-laminar flow cools off-batches.
(2) chemical ingredients: main chemical compositions sees Table 1;
(3) rolling technology: the hot rolling main technologic parameters sees Table 2;
Steel plate finished product mechanical property sees Table 3.
Soak into corrosion test method TB/T2375-93 according to railway with the weathering steel cycle and carry out 72 hours periods infiltration corrosion test, adopt Q345B straight carbon steel and horse steel high-strength weathering steel Q450NQR1 to be the test comparative sample, the atmospheric corrosion resistance test result sees Table 4.
Preferred embodiment 3:
(4) technical process: converter smelting-continuous casting-hot continuous rolling-laminar flow cools off-batches.
(1) chemical ingredients: main chemical compositions sees Table 1;
(2) rolling technology: the hot rolling main technologic parameters sees Table 2;
Steel plate finished product mechanical property sees Table 3.
Soak into corrosion test method TB/T2375-93 according to railway with the weathering steel cycle and carry out 72 hours periods infiltration corrosion test, adopt Q345B straight carbon steel and horse steel high-strength weathering steel Q450NQR1 to be the test comparative sample, the atmospheric corrosion resistance test result sees Table 4.
The chemical ingredients of table 1 embodiment
The hot-rolled process parameter of table 2 embodiment
The mechanical property of table 3 embodiment
The atmospheric corrosion resistance test result of table 4 embodiment
In sum, according to steel grades design of the present invention and technology controlling and process, yield strength 〉=the 900MPa of the steel of gained example steel, tensile strength 〉=1050MPa, unit elongation is more than 15%, the relative erosion rate of resistance to atmospheric corrosion is below 30% of Q345B. steel grade atmospheric corrosion resistance height of the present invention, the obdurability good combination property has good low temperature impact properties and weldability.
Can be applied to the goods train vehicle weathering steel, fields such as engineering machinery and engineering and bridge construction.
Above the present invention has been carried out exemplary description; obviously specific implementation of the present invention is not subjected to the restriction of aforesaid way; as long as the various improvement of having adopted method of the present invention design and technical scheme to carry out, or directly apply to other occasion without improvement, all within protection scope of the present invention.
Claims (10)
1. the high strength highly corrosion resistant performance steel board of a yield strength 900MPa, it is characterized in that, by mass percentage, its composition proportion is: C:0.002 ~ 0.0045, Si:0.15 ~ 0.25, Mn:0.1 ~ 0.9, P :≤0.012, S :≤0.008, Cu:0.25 ~ 0.5, Cr:2.80 ~ 4.0, Ni:0.12 ~ 0.35, Al:0.01 ~ 0.05, Nb:0.015 ~ 0.040, Ti:0.01 ~ 0.02, V:0.008 ~ 0.013, surplus are Fe and unavoidable impurities element.
2. the high strength highly corrosion resistant performance steel board of yield strength 900MPa as claimed in claim 1, it is characterized in that the relative erosion rate of resistance to atmospheric corrosion is below 30% of Q345B, yield strength 〉=900MPa, tensile strength 〉=1050MPa, unit elongation is more than 15%.
3. the production method of the high strength highly corrosion resistant performance steel board of yield strength 900MPa as claimed in claim 1 or 2 is characterized in that, adopts following steps:
(1) converter smelting;
(2) continuous casting;
(3) hot continuous rolling;
(4) laminar flow cooling;
(5) batch.
4. as the production method of the high strength highly corrosion resistant performance steel board of yield strength 900MPa as described in the claim 3, it is characterized in that, in the step (1), in the converter operation, the control of C content is under 300PPm, and O content is controlled under 400PPm, and Cr content reaches 1.5 ~ 2.0%.
5. as the production method of the high strength highly corrosion resistant performance steel board of yield strength 900MPa as described in the claim 4, it is characterized in that, in the step (1), C, O, the composition outside the Cr is finished at refining procedure.
6. as the production method of the high strength highly corrosion resistant performance steel board of yield strength 900MPa as described in each among the claim 3-5, it is characterized in that in the step (2), continuously cast bloom adopts hot charging or cold charge.
7. as the production method of the high strength highly corrosion resistant performance steel board of yield strength 900MPa as described in the claim 6, it is characterized in that, if hot charging, the hot charging temperature of hot charging continuously cast bloom is not less than 580 ℃, if cold charge, continuously cast bloom needs insulating ring cold, and holding temperature is not less than 580 ℃, and ring is as cold as room temperature then;
Perhaps,
When steel plate thickness≤8.0mm, can adopt two sections coolings or directly be cooled to 610 ~ 630 ℃, batch then.
8. as the production method of the high strength highly corrosion resistant performance steel board of yield strength 900MPa as described in each among the claim 3-7, it is characterized in that, in the step (3),
During hot rolling, guarantee the abundant austenitizing of continuously cast bloom, the abundant solid solution of micro alloying element, 1200 ~ 1250 ℃ of Heating temperatures;
Be divided into roughing and finish rolling in rolling, 1100 ~ 1200 ℃ of roughing start rolling temperatures, 1110 ~ 960 ℃ of finish rolling start rolling temperatures, 980 ~ 830 ℃ of finishing temperature start rolling temperatures;
Controlled rolling and cooling requires to have 3 percentage pass reductions more than 930 ℃ at least more than 35%.
9. as the production method of the high strength highly corrosion resistant performance steel board of yield strength 900MPa as described in each among the claim 3-8, it is characterized in that, in the step (4), the mode of segmentation cooling is adopted in the laminar flow cooling, leading portion is cooled to 690 ~ 730 ℃, 10 ~ 20 ℃/s of rate of cooling, air cooling 10 ~ 15s then, with the back segment cooling, 10 ~ 15 ℃/s of rate of cooling is cooled to coiling temperature again; Perhaps intuition adopts the coiling temperature that is cooled to of 10 ~ 15 ℃/s of rate of cooling.
10. as the production method of the high strength highly corrosion resistant performance steel board of yield strength 900MPa as described in each among the claim 3-9, it is characterized in that coiling temperature is 550 ~ 650 ℃ in the step (5).
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