CN108504960A - A kind of large-scale hydroelectric project 1000MPa grades of low crackle water power steel plates and its production method - Google Patents
A kind of large-scale hydroelectric project 1000MPa grades of low crackle water power steel plates and its production method Download PDFInfo
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Abstract
The invention discloses a kind of 1000MPa grades of Low Crack Sensitivity Steel water power steel plates of large-scale hydroelectric project, thickness is 10~50mm, includes the chemical composition of following mass percent：C：0.06~0.17%, Si：≤0.15%、Mn：0.8~2.0%, P：≤0.010%、S：≤0.003%、Ni：1.0~2.0%, Cu：0.10~0.25%, Cr：0.3~1.5%, Mo：0.4~0.7%, V+Nb+Ti：≤0.1%、Als：0.015~0.045%, Ce≤0.020%, CEV≤0.64%, Pcm≤0.28%, other is Fe and relict element.Compared with prior art, the present invention has many advantages, such as that high intensity, high tenacity, low-crackle sensitive, surface quality be good, good weldability.
Description
Technical field
The present invention relates to Plate Production fields, and in particular to quick with 1000MPa grades of low crackles to a kind of large-scale hydroelectric project
Perceptual molten steel electricity steel plate and its production method.
Background technology
As power station is developed to enlarged direction, pressure steel pipe of hydropower station is with water power steel gradually to high intensity, minimizing
Direction is developed.Since 2000, the country started generally to use 600MPa grades of water power steel.It is domestic since Xiangjiabahydropower project
Start the water-power steel using 800MPa grades, currently, 800MPa grades of water power steel obtain in power stations such as white crane beach, black East Germany
It widely applies, large hydropower station has begun to propose use demand to 1000MPa grades of water power steel in the design process.Pressure steel
Pipe and volute have concentrated the most or all of head in power station with steel, are in high pressure conditions.Need to have higher intensity, tough
Property, simultaneously because needing to be attached by welding manner in the wild in the construction process, so needing the weldering for having excellent again
Connecing property, it is convenient to carry out weld job in the construction process.Since water-power steel use environment is special, to the intensity, toughness of steel plate,
Welding performance, corrosion resistance etc. require very strict.Above-mentioned mechanical property of steel plate requires under higher intensity, has good
Low-temperature impact toughness, fracture toughness and good welding performance, research and development difficulty it is very big.
Currently, to meet use demand of the power station to 1000MPa grades of water power steel, based on the neck for researching and developing field in water power steel
First status has carried out 10~50mm thickness ultra-large type hydroelectric project 1000MPa grade high-strength Low Crack Sensitivity Steel water power steel
Research and development, patent of the present invention are successfully had developed by rational composition design and series of process measure with high intensity, height
The ultra-large type hydroelectric project of the 10~50mm thickness for the features such as toughness, low-crackle sensitive, surface quality are good is high-strength with 1000MPa grades
Low Crack Sensitivity Steel steel plate is spent, and has carried out the anti-cold crack experiment of oblique Y types groove, there is good weldability.
Invention content
It low is split with 1000MPa grades in order to solve the above technical problems, the object of the present invention is to provide a kind of large-scale hydroelectric projects
Line sensitive steel water power steel plate has good, good weldability of high intensity, high tenacity, low-crackle sensitive, surface quality etc. excellent
Point.
It is a further object of the present invention to provide a kind of 1000MPa grades of Low Crack Sensitivity Steel water power steel of large-scale hydroelectric project
The production method of plate.
In order to achieve the above objectives, the technical solution adopted by the present invention is:A kind of large-scale hydroelectric project is low with 1000MPa grades
Crack sensitive steel water power steel plate, thickness are 10~50mm, include the chemical composition of following mass percent： C：0.06~
0.17%、Si：≤0.15%、Mn：0.8~2.0%, P：≤0.010%、S：≤0.003%、Ni：1.0~2.0%, Cu：0.10~
0.25%、Cr：0.3~1.5%, Mo：0.4~0.7%, V+Nb+Ti：≤0.1%、Als：0.015~0.045%, Ce≤0.020%,
CEV≤0.64%, Pcm≤0.28%, other is Fe and relict element.
Composition design be ensure performance basis, in conjunction with the infrastructure elements such as C, Si, Mn, Cr, Mo, V in chemical composition for
Improve steel grade intensity and influence the comprehensive function of steel grade plasticity and toughness, and it is right to give full play to its to be added to micro rare earth element ce
The denaturation treatment of field trash and the effect of crystal grain thinning, and P, S constituent content are controlled to reduce it for alloy high strength class
The damaging effect of steel grade gives full play to the double effects of solution strengthening and refined crystalline strengthening, under the premise of not reducing plasticity and toughness, really
The property indices for protecting steel plate reach and higher than the requirements of standard.
A kind of production method of 1000MPa grades of Low Crack Sensitivity Steel water power steel plates of large-scale hydroelectric project, feature exist
In including the following steps：Molten iron KR desulfurization → converter → LF refining → VD vacuum → water cooled mo(u)ld cast → steel ingot demoulding → steel ingot is clear
Flaw detection that reason → surface is with temperature spraying high temperature anti-oxidation coating → heating → high pressure water dephosphorization → high-temperature control rolling → heap is cold → →
Heating → high-pressure water descaling → controlled rolling and controlled cooling → the heap of removing surface → surface band temperature spraying high temperature anti-oxidation coating → again is cold →
Flaw detection → Tempering and Quenching → service check → cutting → storage.
By rational Design of Chemical Composition, make full use of that water cooled mo(u)ld inclusion content is low, Cleanliness of Molten Steel is high, segregation
The advantages that light, is effectively implemented by setting the techniques such as rational heating, rolling and Tempering and Quenching, successfully has developed 10mm
~50mm thickness ultra-large type hydroelectric projects 1000MPa grade high-strength Low Crack Sensitivity Steel water power steel, tensile strength 980~
1130 MPa；Elongation percentage >=15%, in -40 DEG C of V-type side knock work(>=80J, -20 DEG C of strain 5% timeliness impact >=80J；
Description of the drawings；
With reference to the accompanying drawings and embodiments, the technical characteristic of invention is described further；
Fig. 1 is that sorbitic microscopic structure is obtained in the present invention；
Fig. 2 is the microscopic structure that tempered martensite is obtained in the present invention.
Specific implementation mode
With reference to embodiment, the technical characteristic of the present invention is further described.
The embodiment of the present invention is a kind of production 1000MPa grades of Low Crack Sensitivity Steel water power steel of large-scale hydroelectric project
Plate, thickness are 10~50mm, include the chemical composition of following mass percent： C：0.06~0.17%, Si：≤0.15%、
Mn：0.8~2.0%, P：≤0.010%、S：≤0.003%、Ni：1.0~2.0%, Cu：0.10~0.25%, Cr：0.3~1.5%,
Mo：0.4~0.7%, V+Nb+Ti：≤0.1%、Als：0.015~0.045%, Ce≤0.020%, CEV≤0.64%, Pcm≤
0.28%, other is Fe and relict element.
Above-described embodiment uses converter smelting, water-cooled copper plate crystallizer direct casting, the rolling of 3800m wide and heavy plate mills to quench
Firewire carries out quenched mode and produces 1000MPa grade high-strength Low Crack Sensitivity Steel water power steel, and concrete technology flow process is：Molten iron
KR desulfurization → converter → LF refining → VD vacuum → water cooled mo(u)ld cast → steel ingot demoulding → steel ingot cleaning → surface band temperature spraying is high
Warm antioxidant coating → heating → high-pressure water descaling → high-temperature control rolling → heap is cold → flaw detection → removing surface → surface band temperature
Heating → high-pressure water descaling → controlled rolling and controlled cooling → the heap of spraying high temperature antioxidant coating → again is cold → and flaw detection → Tempering and Quenching →
Service check → cutting → storage.
Converter process in above-mentioned technological process：Packet age, packet condition is selected to meet the normal ladle of technological requirement, while wrapping edge
It must be clean；S must be taken off by entering stove molten iron（And selection P as possible is low, the suitable heat molten iron of temperature）, converter be added steel scrap be necessary for
Dry high-quality leftover pieces, it is ensured that tapping carbon >=0.04%, P≤0.007% of tapping.Aluminium ingot is added by 1.5Kg/t steel in tapping process,
Then mid-carbon fe-mn is added, alloy and deoxidier containing Si must not be added, avoid tapping process slag；
LF refining technique in above-mentioned technological process：Using big quantity of slag slagging process, it is desirable that it is necessary that one heating of refining terminates clinker
Bleach or yellowish-white, the white slag retention time >=30min, it is desirable that the finishing slag for refining end is good fluidity, the suitable foam of viscosity
White slag, LF refining process control within 2 times the fine tuning number of Als ingredients；It can be taken when temperature reaches 1600 DEG C or more
Sample chemically examines ingredient, meets the requirements in ingredient（P content≤0.008%, C content≤0.08%）Shi Fangke, which is determined, executes the plan；It wants
It asks and gets out alloy in advance, fast deployment ingredient and heating after determination can execute the plan avoid heating-up time long C super
Mark；The control of molten steel Si contents is using high alkalinity refining slag, lime, and deoxidier is based on calcium carbide, aluminum shot, to ensure refining slag system
For calcium aluminate slag system, it is desirable that in slag（SiO2%）It is necessary≤8% simultaneously basicity it is necessary >=8；When alloy fine tuning simultaneously, it must not use and appoint
What alloy containing Si.
VD vacuum refinings in above-mentioned technological process：The VD dwell times are according to >=20min controls, it is desirable that in the true of 66.7Pa
Under reciprocal of duty cycle, pressure maintaining period molten steel, which seethes, to work well, H content requirement≤1.2PPm；Added in time after broken empty rice husk soft blow 5~
8min, it is leaving from station to be ready for bull ladle, and temperature control leaving from station is at 1580 DEG C or so；
Water cooled mo(u)ld casting in above-mentioned technological process：Specific requirement hot top of reaching the standard grade must be toasted, baking time >=4h, be protected
It demonstrate,proves hot top temperature and is more than 100 DEG C；It is cast using 850mm thickness water cooling ingot moulds, water cooled mo(u)ld used must assure that taper（30mm）, pendulum
Mould, which finishes, to be measured；Pouring temperature is controlled according to 1560~1565 DEG C；Temperature is properly cast afterwards after molten steel arrives at a station；Cast
After must assure that cap mouth heat insulation effect.
Steel ingot cleaning in above-mentioned technological process：After demoulding for 24 hours in clean out；It must be by macroscopic crackle
Complete liquidation is clean.
Surface band temperature spraying high temperature anti-oxidation coating in above-mentioned technological process：Wait for that strand temperature is cooled to 300 DEG C or less
Afterwards, high temperature anti-oxidation coating is sprayed to by billet surface using spray gun, coating thickness requirement is more than 0.4mm.
Heating process in above-mentioned technological process:It is heated using dead soaking pit, is added according to II group of ingot case collocation temperature dress
Thermal process executes, when shove charge, furnace temperature≤600 DEG C；Stewing 400~500 DEG C of steel temperature, boils in a covered pot over a slow fire 2 or more hours of steel, with≤100 DEG C of liter
Warm speed rises to 700 DEG C, and 700~750 DEG C keep the temperature 3 hours, and 900~950 DEG C keep the temperature 3 hours, and the high temperature section heating-up time controls 8
~10h, 1260~1300 DEG C of target holding temperature, soaking time 11~13min/cm controls；2~3 hours before heat preservation terminates
Double steel after double steel, is warming up to holding temperature, taps after being kept the temperature by remaining soaking time；
High-temperature control rolling mill practice in above-mentioned technological process：In high temperature controlled rolling stage control rolling rhythm, extend road minor tick
Time can make crystal grain more fully dynamic, obtain better relaxation effect.1020 DEG C of steel billet start rolling temperature ＞, finishing temperature
950 DEG C of ＞ notices that passage interval time 1min or more, axial rolling stage reduction in pass ensure at least three passage pressures in the operation of rolling
Lower amount >=55mm controls, rotating speed≤20rad/min.
The cold technique of heap in above-mentioned technological process：Cold, 500~650 DEG C of the offline temperature using the offline clamp progress heap of high temperature,
Heap cool time >=3 day.
Defects detecting technology in above-mentioned technological process：It after steel plate de-stacking, first detects a flaw, cap mouth is cut after flaw detection and according to intermediate base ruler
Turn steel billet cleaning room after after the cutting of little progress row to be cleared up, high temperature anti-oxidation coating is sprayed into billet surface, coating after cleaning
Thickness requirement is more than 0.2mm.
Heating process again in above-mentioned technological process：It is heated using heating furnace, temperature and heating time be：900
DEG C with tripping in stove, bringing-up section temperature is controlled according to 1220~1240 DEG C, and soaking zone is controlled according to 1200~1220 DEG C, when total heating
Between according to 10~13min/cm control.
Cooling controlling and rolling controlling process in above-mentioned technological process：The rolling requirements of strict adherence " high temperature, low speed, big pressure ", are opened
980~1150 DEG C of temperature is rolled, a stage finishing temperature waits for that temperature thickness is 1.5 times of finished product thickness at 950~1050 DEG C.Second order
Section start rolling temperature≤880 DEG C, finishing temperature control is between 800~830 DEG C；
In order to obtain excellent comprehensive mechanical property, 25~50mm steel plates use section cooling after rolling, by adjusting cooling manifold
Group number, it is ensured that straight into temperature correction of robbing after cooling between 630~680 DEG C of red temperature；10~25mm steel plates roll after without water
Cold, direct heap is cold after aligning.
The cold technique of heap in above-mentioned technological process:Stacking slow cooling temperature is not less than 300 DEG C, heap cool time >=48 hour；
Hardening and tempering process in above-mentioned technological process:900~930 DEG C, 2.2~2.4min/mm of soaking time of hardening heat, tempering temperature
550~630 DEG C of degree, 4~5min/mm of soaking time；
Interpretation of result：
1）Mechanical mechanics property is analyzed
Composition and mechanical mechanics property press QJ/CTG 24-2015, and mechanical performance average value specifically see the table below：
2）The microscopic structure of sorbite and tempered martensite is obtained, as depicted in figs. 1 and 2,
It is analyzed by above-mentioned mechanical mechanics property and microscopic structure, can learn the 10~50mm produced in the embodiment of the present invention
Thick ultra-large type hydroelectric project 1000MPa grade high-strength Low Crack Sensitivity Steel water power steel, passes through rational Design of Chemical Composition
And controlling of production process, successfully develop ultra-large type hydroelectric project 1000MPa grade high-strength Low Crack Sensitivity Steel water power
Steel.The control of its yield strength is controlled in 930~980MPa, tensile strength in 996~1080 MPa；Elongation control 15%~
17%；- 40 DEG C of V-type ballistic work controls are in 80~120J, and strain 5% timeliness impact is in 89-130J.
Oblique Y types have been carried out to the 1000MPa grade high-strength Low Crack Sensitivity Steel water power steel produced in the embodiment of the present invention
Groove anti-crack is tested, and after preheating temperature reaches 120 DEG C, flawless in welding process may be implemented, and has good welding
Property, it is appropriate for field construction.
To the 1000MPa grade high-strength Low Crack Sensitivity Steel water power steel produced in the embodiment of the present invention, by using table
Mode of the face with temperature spraying high temperature anti-oxidation coating, effective solution scale on surface caused by due to containing higher Ni
The final surface quality of steel plate has been effectively ensured in the problem of being difficult to be removed with high pressure water.
The steel plate produced in the embodiment of the present invention is examined outside, the percentage of A-class goods 100%；It detects a flaw, unifies by JB/T 47030
Grade rate is 99%, and it is 100% to close three-level rate, has reached desired effect.
Described above is only presently preferred embodiments of the present invention, and above-mentioned specific embodiment is not limitation of the present invention,
Retouching, modification or the equivalent replacement that all those skilled in the art are made as described above belong to the guarantor of the present invention
Protect range.
Claims (2)
1. a kind of 1000MPa grades of low crackle water power steel plates of large-scale hydroelectric project, it is characterised in that：Thickness is 10~50mm, packet
Include the chemical composition of following mass percent： C：0.06~0.17%, Si：≤0.15%、Mn：0.8~2.0%, P：≤0.010%、
S：≤0.003%、Ni：1.0~2.0%, Cu：0.10~0.25%, Cr：0.3~1.5%, Mo：0.4~0.7%, V+Nb+Ti：≤
0.1%、Als：0.015~0.045%, Ce≤0.020%, CEV≤0.64%, Pcm≤0.28%, other is Fe and relict element.
2. a kind of large-scale hydroelectric project production method of 1000MPa grades of low crackle water power steel plates, it is characterised in that including following
Step：Molten iron KR desulfurization → converter → LF refining → VD vacuum → water cooled mo(u)ld cast → steel ingot demoulding → steel ingot cleaning → surface band
Temperature spraying high temperature anti-oxidation coating → heating → high pressure water dephosphorization → high-temperature control rolling → heap is cold → and flaw detection → removing surface →
Flaw detection → quenched that surface is with temperature spraying high temperature anti-oxidation coating → heating → high-pressure water descaling → controlled rolling and controlled cooling → heap is cold again →
Heat treatment → service check → cutting → storage.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109234632A (en) * | 2018-10-27 | 2019-01-18 | 南阳汉冶特钢有限公司 | 80-120mm thickness deep sea submarine easily welding anti-corrosion and high strength Q690E steel plate and its production method |
| CN112143958A (en) * | 2019-06-27 | 2020-12-29 | 宝山钢铁股份有限公司 | 1000 MPa-grade steel plate with super-thick, super-high toughness and excellent weldability and manufacturing method thereof |
| CN114134301A (en) * | 2021-11-24 | 2022-03-04 | 南京钢铁股份有限公司 | Two-fire rolling method for 1000 MPa-grade hydroelectric steel plate |
| CN114395731A (en) * | 2021-12-16 | 2022-04-26 | 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 |
| CN115747657A (en) * | 2022-11-26 | 2023-03-07 | 南阳汉冶特钢有限公司 | HY950CF steel plate for high-strength hydropower engineering and production method thereof |
| CN116219293A (en) * | 2023-02-27 | 2023-06-06 | 鞍钢股份有限公司 | Super-thick and super-high-power steel for hydroelectric engineering and manufacturing method thereof |
| CN116254471A (en) * | 2023-02-27 | 2023-06-13 | 鞍钢股份有限公司 | 1000 MPa-level easily-welded extra-thick steel for hydropower and manufacturing method thereof |
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| CN105925897A (en) * | 2016-07-05 | 2016-09-07 | 南阳汉冶特钢有限公司 | 10-80-mm high-strength low-crack sensitive steel SX780CF for large-scale hydroelectric project and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105925897A (en) * | 2016-07-05 | 2016-09-07 | 南阳汉冶特钢有限公司 | 10-80-mm high-strength low-crack sensitive steel SX780CF for large-scale hydroelectric project and preparation method thereof |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109234632A (en) * | 2018-10-27 | 2019-01-18 | 南阳汉冶特钢有限公司 | 80-120mm thickness deep sea submarine easily welding anti-corrosion and high strength Q690E steel plate and its production method |
| CN112143958A (en) * | 2019-06-27 | 2020-12-29 | 宝山钢铁股份有限公司 | 1000 MPa-grade steel plate with super-thick, super-high toughness and excellent weldability and manufacturing method thereof |
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Application publication date: 20180907 |