CN103290339B - High-strength steel plate for 800MPa hydropower station pressure pipeline and production method thereof - Google Patents
High-strength steel plate for 800MPa hydropower station pressure pipeline and production method thereof Download PDFInfo
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Abstract
The invention provides a high-strength steel plate for an 800MPa hydropower station pressure pipeline and a production method thereof, and belongs to the technical field of steel for hydropower stations. The steel is composed of the following chemical ingredients in percentage by weight: 0.08-0.10% of C, not larger than 0.25% of Si, 1.2-1.6% Mn, not larger than 0.013% of P, not larger than 0.02% of S, 0.01-0.03% of Nb, not larger than 0.03% of V, 0.01-0.02% of Ti, 0.15-0.50% of Ni, 0.20-0.60% of Cr, 0.05-0.30% of Mo, 0.0010-0.0015% of B and the balance of Fe and inevitable impurities. Since element ingredients are reasonably combined and designed and corresponding rolling and heat treatment techniques are matched, the steel plate has excellent welding adaptability while having excellent strength, plasticity and low-temperature impact toughness, and the welding cold cracking sensitivity index Pcm is not larger than 0.22%.
Description
Technical field
The invention belongs to power station steel technical field, particularly relate to a kind of 800MPa level hydropower station pressure pipeline High Strength Steel Plate and production method.
Background technology
In construction of hydropower stations evolution, along with unit is towards high-parameters, Large Copacity future development, pressure steel pipe of hydropower station caliber is day by day huge, the steel plate that current power station generally uses is 610MPa level, need to ensure steel plate-20 DEG C ~-40 DEG C impelling strength, and there is good weldability adaptability.Along with new design power station head constantly increases, the continuous increase of steel penstock design caliber, pressure, when not promoting steel strength grade, need increase steel plate thickness to ensure to design needs, so both add construction difficulty, also make laid down cost significantly increase.Adopt the steel plate of more high intensity levels (800MPa level) to manufacture pressure steel pipe of hydropower station, can thickness of steel pipe be effectively reduced, reduce rolled steel dosage, reduce difficulty of construction, cost-saving, to construction of hydropower stations important in inhibiting.
The steel construction Service Environment such as hydropower station pressure pipeline, bifurcated pipe, spiral case belong to wet environment, and one-piece construction bears larger internal pressure, is vulnerable to environmental corrosion.According to construction of hydropower stations diverse geographic location, steel pipe Service Environment temperature is minimum reaches-20 DEG C.Steel penstock manufactures in the course of processing, needs to carry out in pipe crimping, welded tube, rotproofing, hole the multiple working procedures such as welding assembly to steel plate.Therefore except the intensity to steel plate, plastic property require higher except, also require that there is the enough toughness deposits of steel plate (can reach-40 DEG C), excellent weldability (low welding cold cracking Sensitivity Index), good cold working and welding usability.Very high requirement is proposed to the composition of material, organization design and stable manufacturing process.
Hydropower station pressure pipeline steel plate generally adopts hardening and tempering process to produce.Hardened and tempered steel plate often needs to add the alloying elements such as a large amount of Cr, Mo, Ni, Cu, ensures that steel plate has enough hardening capacity, to guarantee that steel plate all has enough intensity, excellent low-temperature flexibility and homogeneity good in the width direction.But adding of a large amount of alloying element, the steel plate manufacturing cost increased on the one hand, improves steel plate carbon equivalent (Ceq) and welding cold cracking Sensitivity Index (Pcm) on the other hand, causes welding pre-heating temperature to increase, and difficulty of construction increases.Need to consider the relation between carbon content, alloying element and Ceq, Pcm value in the Composition Design process of hydraulic power pressure steel for steel pipes plate, under the prerequisite ensureing hardening capacity, improve the welding usability of steel plate as far as possible.
Application number is that the patent of 201210311306.X proposes a kind of high strength adjustment steel plate low-cost manufacture method, and it can produce product specification is 6-60mm, and strength grade is 600-800MPa steel plate.Wherein said steel plate primary alloy constituent is C:0.14-0.18%, Si:0.1-0.4%, Mn:1.4-1.7%, Cr:0.4-0.6%, Ti:0.01-0.03%, B:0.001-0.003%.This patent visible take Cr as main raising intensity element, calculates Pcm≤0.32, have larger welding cold cracking sensitivity coefficient according to its composition provided.If for hydropower station pressure pipeline, will greatly increase welding difficulty, and increase welding cost, the requirement of power station 800MPa level hydropower station pressure pipeline steel plate can not be met.
Application number is CN200810119502.0, CN200810224730.4 and CN200810032333.7, the patent of CN200510047196.0 all proposes a kind of low-welding crack-sensitive, tensile strength is 610MPa level high pressure Plate Production method, and steel plate is applicable to pressurized vessel, construction machinery production field.Have good welds adaptability, but yield strength is only more than 460-500MPa, tensile strength is only 570-630MPa, can not arrive the requirement of 800MPa level hydropower station pressure pipeline Steel Properties.
Application number is that the patent of CN2005100191165.4 and CN02115877.0 all proposes a kind of steel in use for soldering pressure pipe in hydraulic power station under large line energy production method, chemical composition C:0.04 ~ 0.12%, Si:0.1 ~ 1.0%, Mn1.1 ~ 2.0%, Cr :≤2.0%, Ni:0.26 ~ 0.5%, Cu :≤0.5%, Nb≤0.05%, Ti:0.01 ~ 0.040%, Al:0.02 ~ 0.04%, B:0.0005 ~ 0.003%, N:0.0003 ~ 0.005%, O:0.003 ~ 0.007, P :≤0.02%, S :≤0.015% steel plate is applicable to hydropower station pressure pipeline Working environment, there is good corrosion resistance and welding adaptability, but its yield strength is only 500MPa, it uses higher Ni, Cr precious alloy, cost of alloy is higher.
Application number be 200710094177.2 patent propose a kind of yield strength 800MPa low welding crack sensitivity steel plate manufacture method, steel plate composition is C:0.03 ~ 0.08%, Si:0.05 ~ 0.70%, Mn1.3 ~ 2.2%, Mo0.10 ~ 0.3%, Nb0.03 ~ 0.10% V:0.03 ~ 0.45%, Ti:0.002 ~ 0.040%, Al:0.02 ~ 0.04%, B:0.001 ~ 0.002%, although this steel plate intensity is higher, welding cold cracking sensitivity coefficient Pcm≤0.20%, but adopt controlled rolling and controlled cooling rolling technology to produce, only ensure-20 DEG C of Charpy-V impact powers.
Application number is the low welding crack sensitivity steel plate manufacture method that the patent of CN200710094178.7 proposes that a kind of yield strength is 690MPa, and its steel plate composition is C:0.03 ~ 0.06%, Si:0.05 ~ 0.40%, Mn:1.30 ~ 2.00%, Mo:0.10 ~ 0.25%, Nb:0.03 ~ 0.08% V:0.03 ~ 0.12%, Ti:0.002 ~ 0.030%, Al:0.02 ~ 0.04%, B:0.001 ~ 0.002%.Adopt thermo-mechanical rolling+controlled cooling technique obtain needed for performance, but due to the impact property that can ensure to the greatest extent-20 DEG C of this type of steel plate, the rigors that hydropower industry is laid in steel plate toughness cannot be reached.
Application number is that the patent of CN201210078313.X and CN200910046442.9 all proposes a kind of low-carbon-equivalent high-performance adjustment steel sheet manufacturing method, and tensile strength reaches 780MPa, and steel plate described in it is mainly used in engineering machinery, equipment manufacturing field.Steel plate Composition Design involved in patent and manufacturing process cannot ensure performance after plate strain, cannot be applied to the manufacture of hydropower station pressure pipeline.Patent is obviously different from rolling technological parameter described in this patent in addition.
Summary of the invention
The object of the present invention is to provide a kind of 800MPa level hydropower station pressure pipeline High Strength Steel Plate and production method, combine by rational elemental composition and design, mate corresponding rolling and thermal treatment process, obtaining excellent intensity (tensile strength >=780MPa), plasticity (unit elongation >=16%) and low-temperature impact toughness (-40 DEG C of Charpy-V impact power >=130J) are simultaneously, steel plate has good welding adaptability, welding cold cracking Sensitivity Index Pcm≤0.22%.And after ensureing steel plate cold deformation, each mechanical property is substantially even, and has enough toughness deposits.
For reaching above object, technical scheme of the present invention is:
The present invention adopts low C-low Si-height Mn-(Nb+Ti) based on microalloyed steel component system, rational interpolation Ni, Cr, Mo, B alloying element improves steel plate hardening capacity, control welding cold cracking Sensitivity Index simultaneously, adopt the hardening and tempering process of the controlled rolling scheme+optimization optimized, obtain tiny tempered martensite+tempering bainite tissue, ensure that steel plate obtains good obdurability coupling.
Concrete, the 800MPa level hydropower station pressure pipeline High Strength Steel Plate that the present invention relates to, its Ingredients Weight very number is: C:0.08 ~ 0.10%, Si :≤0.25%, Mn:1.2 ~ 1.6%, P :≤0.013%, S :≤0.002%, Nb:0.01 ~ 0.03%, V :≤0.03%, Ti:0.01 ~ 0.02%, Ni:0.15 ~ 0.50%, Cr:0.20 ~ 0.60%, Mo:0.05 ~ 0.30%, B:0.0010 ~ 0.0015%, surplus is Fe and inevitable impurity.Meanwhile, the content of above-mentioned element also should meet welding cold cracking Sensitivity Index Pcm0.22%, Pcm(%)=C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B.
In the Composition Design of steel of the present invention:
C: all have remarkably influenced to armor plate strength, plasticity, low-temperature flexibility.C mainly to play solution strengthening effect, finally plays the effect improving intensity, but damages plasticity, toughness and welding property simultaneously in steel.Consider its influence to plate property, C content is unsuitable too high, and its loss of strength caused containing quantity not sufficient can be compensated by the interpolation of other elements.Determine that C content is 0.08 ~ 0.10%.
Si: play the effect improving intensity in quenched and tempered steel, alloying element conventional in steel is become because it is cheap, but it too much adds the reduction by causing plasticity toughness, unfavorable to welding property especially, in Large Heat Input Welding process, Si can aggravate the formation on thick uneven MA island, the low-temperature impact toughness of grievous injury heat affected zone, so Si content is :≤0.25%
Mn: the while of playing the effect improving intensity in quenched and tempered steel, reduce austenite and expand austenite phase field to ferrite transformation temperature, be conducive to the control to grain-size in controlled rolling process, comparatively tiny grain structure can be obtained, improve steel plate toughness.But when Mn too high levels, central segregation of slab increases the weight of, and easily forms abnormal structure in follow-up rolling and process of cooling, affects steel plate impact property, particularly steel plate heart portion performance.And the determination of Mn content should be mated with C content, when C content increase is, Mn content can suitably reduce, and vice versa.Be 0.06 ~ 0.10% according to the C content that the present invention determines, determine that its suitable Mn content range is 1.2 ~ 1.6%.
P, S: be the harmful element in steel, should strictly control its content, P has a strong impact on steel plate low-temperature flexibility to welding property is totally unfavorable simultaneously; S and Mn combines may generate the MnS inclusion having a strong impact on steel plate Z-direction performance, and consider to smelt and cost benefit, this patent P content controls below 0.013%, and S controls below 0.002%.
Nb, V, Ti: for obtaining the important element of small grains tissue in controlled rolling process.The carbon that Nb, V, Ti are formed, nitride can crystal grain thinnings, suppress Austenite Grain Growth in slab heat-processed, thus obtain the austenite structure of fine uniform, improve armor plate strength and improve steel plate toughness.The carbonitride particle of the too low generation of its content is very few, can not reach the effect suppressing austenite to be grown up, and content too much will damage steel plate toughness.Because Nb, Ti do not contribute welding cooling cracks the susceptible index number Pcm, and V is comparatively large to Pcm contribution, so select Nb, Ti to reach the object of crystal grain thinning, Nb:0.01 ~ 0.03%, Ti:0.01 ~ 0.02% as main microalloy element.Suitably V is added, V for thickness specification >=40mm steel plate :≤0.03%.
Ni:Ni not only can expand austenite phase field, reduce austenite ferrite transition temperature, refinement martensite/bainite grain-size, and the phasic difference that can increase between martensite/ferrite lath, increase the resistance of crackle through martensite/bainite crystal grain, improve intensity and the toughness of hardened and tempered steel plate simultaneously.Ni is very useful for raising hardened and tempered steel plate low-temperature impact toughness, limited to welding performance impact within the specific limits.Ni to Pcm to contribute to other element phase transformations less, so as alloying element important in the present invention, consider price factor and too much Ni is to the sclerization of welded heat affecting zone, Ni content is 0.15 ~ 0.50%.
Cr: be weak carbide forming element, can increase the hardening capacity of steel, improves armor plate strength, and can increase the phasic difference between martensite/ferrite lath, improve steel plate impelling strength to a certain extent.But too much Cr affects the welding property of steel plate, it is greater than Ni to the contribution of Pcm, but alloying constituent is lower than Ni, and consider plate property and cost factor, Cr content is 0.20 ~ 0.60% in this patent.
Mo: be middle carbide, significantly improve the hardening capacity of steel, promote martensite/bainitic transformation, but increase martensite/bainite grain-size, the phasic difference between Jian little Shi body/ferrite lath simultaneously, so while raising armor plate strength, reduce toughness, and damage welding property, it is greater than Cr, Ni to Pcm contribution, and Mo is a kind of precious alloy, too much adds and increases considerably manufacturing cost.Control Mo content is Mo:0.05 ~ 0.30% in the present invention.
B: the hardening capacity significantly increasing steel, but too much adding has loss to steel plate toughness and weldability, and add-on is 0.0010 ~ 0.0015%.
Production technique of the present invention is as follows:
1) strand production technique
Strand is produced and is adopted desulfurizing iron to skim → converter smelting → LF refining → RH refining → sheet billet continuous casting operational path, strictly controls slab composition: C:0.08 ~ 0.10%, Si :≤0.30%, Mn:1.20 ~ 1.60%, P :≤0.013%, S :≤0.002%, Nb:0.01 ~ 0.03%, V :≤0.03%, Ti:0.01 ~ 0.02%, Ni:0.15 ~ 0.50%, Cr:0.20 ~ 0.60%, Mo:0.05 ~ 0.30%, B:0.0010 ~ 0.0015%.
Perform LF refining and RH refining, the dark vacuum time 12min-15min of RH, [H] content in strict control steel, ensures molten steel cleanness; Ensure that in steel, Ca/S is between 1.5-2, makes inclusion obtain abundant modification, control level of inclusions.Inclusion and material matrix interface more easily occur that after effects of strain stress concentration, dislocation are assembled, and become Materials Fracture source, thus cause mechanical properties decrease, and particularly impact property declines.So control level of inclusions category-A≤0.5 in the present invention, category-B≤1.0, C class≤0.5, D class≤1.0.
2) heating of plate blank technique
Employing continuously cast bloom is produced, and heating of plate blank 1150 ~ 1250 DEG C, soaking time 3 ~ 6 hours, had both ensured the abundant solid solution of microalloy, did not make again austenite crystal too grow up.
3) rolling technology
Adopt recrystallization zone and Unhydrated cement two-phase control rolling.
First stage is recrystallization zone rolling, and start rolling temperature 1000 DEG C ~ 1100 DEG C, needs to give full play to mill milling ability, and ensure that first stage rolling single pass draft increases gradually, and last three percentage pass reductions are 25%-35%, total reduction is greater than 60%.Traditional controlled rolling technique often emphasizes subordinate phase rolling, and think that first stage rolling Main Function is that broadening extends, subordinate phase is the key of quality control.It is considered herein that for quenched and tempered steel, quenching after martensite/bainite colony size and austenite grain size closely related, require emphasis one-phase rolling procedure, ensure during first stage rolling, utilize repeatedly the rolling of heavy reduction rate, coordinate the rolling temperature of 1000 ~ 1100 DEG C, make austenite crystal fully be out of shape generation recrystallize, can obtain tiny and uniform austenite structure, grain-size is 20 ~ 50 μm.And evenly tiny tissue is to ensureing that the low-temperature impact toughness of quenched and tempered steel is extremely necessary, when quenched and tempered steel uneven microstructure, low-temperature impact toughness is easy to the situation occurring that monodrome is low, and by rational rough rolling step rolling procedure adjustment, the stability of low-temperature impact toughness can be improved, improve plate quality hit rate.
Subordinate phase is Unhydrated cement rolling, start rolling temperature 840 DEG C ~ 860 DEG C, finishing temperature 800 ~ 820 DEG C.Treat that temperature thickness is 1.2 ~ 1.6 times of thickness of slab.
4) process for cooling
Roll rear steel plate and adopt controlled rolling process for cooling, speed of cooling 7 ~ 15 DEG C/S
5) thermal treatment process
Adopt the thermal treatment process of quenching+tempering, the use of hardening and tempering process is conducive to improving plate property, the stability of improving the quality of products.
Steel plate quenching Heating temperature 920 ~ 950 DEG C, soaking time 25min-35min, soaking time is the hold-time starting timing after steel plate heart portion reaches design temperature.Ensure steel plate tensile strength > 1000MPa after quenching, surface of steel plate is organized as martensite+ferrite bainite mixed structure, 1/4 and heart portion be ferrite bainite tissue.
Steel plate tempering Heating temperature 500 ~ 600 DEG C, soaking time 25min-35min, soaking time is the hold-time starting timing after steel plate heart portion reaches design temperature, is tempered martensite+tempering bainite tissue after tempering.
Beneficial effect of the present invention:
The present invention is by rational alloying element unitized design, the rolling technology optimized and thermal treatment process, acquisition welding property is good, the high-strength water-power station penstock steel plate of low welding cold cracking Sensitivity Index, yield strength >=690MPa, tensile strength >=780MPa, section unit elongation >=16% ,-40 DEG C of low-temperature impact toughness monodrome >=130J.Steel plate still has sufficient toughness surplus in making steel penstock process, ensures that steel plate is at cold deformation mechanical property uniformity and good low-temperature impact toughness.To reduction construction of hydropower stations cost, reduce water power steel steel penstock welding difficulty, saving construction cost and have vital role, is high added value, green environmental protection product.
Accompanying drawing explanation
Fig. 1 is the microstructure at the embodiment of the present invention 4 steel plate thickness direction 1/4 place.
Fig. 2 is the microstructure in heart portion, the embodiment of the present invention 4 steel plate thickness direction.
Embodiment
The thickness specification of producing according to production method of the present invention≤60mm adjusts the embodiment of steel plate as following table.
Table 1 is the composition for the embodiment of the present invention, and table 2 is the rolling technology of the embodiment of the present invention, and table 3 is embodiment thermal treatment process, and table 4 is embodiment mechanical property.As seen from the table, manufacture method of the present invention can the 800MPa level hydropower station pressure pipeline hardened and tempered steel plate of production performance temperature, yield strength >=690MPa, tensile strength >=780MPa, unit elongation >=16% ,-40 DEG C of notched bar impact strength monodrome >=130J.
Carry out rolling up compatibility test to embodiment 4, rolling out radius-of-curvature to steel plate is 867mm segmental arc, and carry out horizontal mechanical performance inspection to roll bending outer circumferential position, result is as table 5.From result, after roll bending, properties has no obvious decline compared with before roll bending.
Table 1 embodiment ingredient w t, %
Table 2 embodiment rolling technology
Table 3 embodiment thermal treatment process
Table 4 embodiment mechanical property
Mechanical property after table 5 embodiment 4 roll bending
Welding compatibility test is carried out to embodiment after pipe crimping 4, welding setting and after union-melt weld welding joint properties if table 6, table 7, table 8 are from result, after adopting large input to weld, welding joint mechanical property is good, low-temperature impact toughness comparatively mother metal declines to some extent, but-40 DEG C still reach more than 60J, the requirement of hydropower station pressure pipeline steel plate can be reached.
Table 6 example 4 is Y cold crack test-results tiltedly
Table 7 example 4 welding joint mechanical property
Table 8 example 4 impact toughness of welded joint
Claims (1)
1. a production method for 800MPa level hydropower station pressure pipeline High Strength Steel Plate, is characterized in that, the technical parameter of production technique and control comprises:
(1) strand is produced and is adopted desulfurizing iron to skim → converter smelting → LF refining → RH refining → sheet billet continuous casting operational path, the dark vacuum time 12min-15min of RH, ensures that in steel, Ca/S is between 1.5-2;
(2) heating of plate blank technique: heating of plate blank 1150 ~ 1250 DEG C, soaking time 3 ~ 6 hours;
(3) controlled rolling process: adopt two-phase control rolling, first stage start rolling temperature 1000 DEG C ~ 1100 DEG C, ensure that first stage rolling single pass draft increases gradually, and last three percentage pass reductions are 25%-35%, total reduction is greater than 60%; Subordinate phase start rolling temperature 840 DEG C ~ 860 DEG C, finishing temperature 800 ~ 820 DEG C; Treat that temperature thickness is 1.2 ~ 1.6 times of thickness of slab;
(4) process for cooling: roll rear steel plate and adopt controlled rolling process for cooling, speed of cooling 7 ~ 15 DEG C/S;
(5) thermal treatment process: quenching+tempering, steel plate quenching Heating temperature 920 ~ 950 DEG C, soaking time 25min-35min, steel plate tempering Heating temperature 500 ~ 600 DEG C, soaking time 25min-35min;
Described steel plate chemical component weight percentage ratio is: C:0.08 ~ 0.10%, Si :≤0.25%, Mn:1.2 ~ 1.6%, P :≤0.013%, S :≤0.002%, Nb:0.01 ~ 0.03%, V :≤0.03%, Ti:0.01 ~ 0.02%, Ni:0.15 ~ 0.50%, Cr:0.20 ~ 0.60%, Mo:0.05 ~ 0.30%, B:0.0010 ~ 0.0015%, all the other be Fe and inevitably impurity simultaneously, the content of above-mentioned element also should meet welding cold cracking Sensitivity Index Pcm≤0.22%.
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| CN104532148A (en) * | 2014-12-10 | 2015-04-22 | 南京钢铁股份有限公司 | 800MPa grade low-welding crack sensitive tempering type hydroelectric steel plate |
| KR101665819B1 (en) | 2014-12-24 | 2016-10-13 | 주식회사 포스코 | Steel material for heat treating, formed component having extra high strength and high fatigue resistance and method for manufacturing the formed component |
| CN105385956A (en) * | 2015-12-12 | 2016-03-09 | 郭策 | Diversion pressure pipeline of hydropower station |
| CN106834925A (en) * | 2017-01-12 | 2017-06-13 | 河钢股份有限公司 | A kind of 780MPa grades of quenching and tempering type water-power steel plate and production method |
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| CN111876687A (en) * | 2020-08-12 | 2020-11-03 | 宝武集团鄂城钢铁有限公司 | Easy-to-weld high-strength steel with excellent low-temperature toughness and tensile strength of 800MPa and production method thereof |
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| CN113637919A (en) * | 2021-07-23 | 2021-11-12 | 南京钢铁股份有限公司 | High-efficiency low-cost 800 MPa-grade steel plate for hydropower and production method thereof |
| CN114395731B (en) * | 2021-12-16 | 2023-01-24 | 南阳汉冶特钢有限公司 | Low-welding crack sensitivity crack arrest steel HY950CF for hydroelectric engineering and production method thereof |
| CN115896622A (en) * | 2022-11-21 | 2023-04-04 | 包头钢铁（集团）有限责任公司 | 800 MPa-grade easy-welding hydroelectric steel plate with excellent low-temperature impact toughness |
| CN115612939B (en) * | 2022-12-20 | 2023-03-28 | 江苏省沙钢钢铁研究院有限公司 | 1000 MPa-grade high-strength hot-rolled steel plate and preparation method thereof |
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Inventor after: Zhou Deguang Inventor after: Zhang Xuefeng Inventor after: Feng Lulu Inventor after: Bai Xuejun Inventor after: Liu Jianming Inventor after: Zhang Xuesong Inventor after: Sui Helong Inventor after: Qin Liye Inventor after: Zou Yang Inventor after: Zhao Nan Inventor after: Lv Yanchun Inventor after: Liu Meiyan Inventor after: Liu Yinliang Inventor after: Meng Dongli Inventor before: Sui Helong Inventor before: Feng Lulu Inventor before: Bai Xuejun Inventor before: Liu Jianming Inventor before: Zhang Xuesong Inventor before: Qin Liye Inventor before: Zou Yang Inventor before: Zhao Nan Inventor before: Lv Yanchun Inventor before: Liu Meiyan Inventor before: Liu Yinliang Inventor before: Meng Dongli Inventor before: Zhang Xuefeng |
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