CN103540839B - A kind of spherical tank is without the production method of Cr high-strength hardened and tempered steel plate - Google Patents
A kind of spherical tank is without the production method of Cr high-strength hardened and tempered steel plate Download PDFInfo
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Abstract
Spherical tank is without a production method for Cr high-strength hardened and tempered steel plate, and processing step is converter steelmaking → ladle furnace refining → vacuum-treat → continuous casting → heating → rolling → quenching → tempering → service check → UT (Ultrasonic Testing).The percent mass of steel consists of: C=0.08 ~ 0.10, Si=0.15 ~ 0.40, Mn=1.45 ~ 1.60, P≤0.015, S≤0.003, V=0.04 ~ 0.042, Nb=0.015 ~ 0.025, Mo=0.3 ~ 0.40, Ni=0.40 ~ 0.60, B≤0.0008, all the other are Fe and inevitable impurity element, control Pcm≤0.21%.Armor plate strength brings up to 690MPa level, is thinned spherical tank wall thickness; Steel plate yield tensile ratio is less than 0.95, and uniform elongation is greater than 8%, and the impact absorbing energy that steel plate meets relevant temperature brings up to standard i.e.-50 DEG C of horizontal KV2 >=100J of more than 100J; Not adding the Composition Design of Cr, providing possibility for realizing Large Heat Input Welding; Ensure that the welding property of High Strength Steel Plate.
Description
Technical field
The invention belongs to steel-smelting technology, is the production method of a kind of spherical tank without Cr high-strength hardened and tempered steel plate.
Background technology
In the world since the eighties in 20th century develops 610MPa level ball steel plate for tanks, 610MPa level ball steel plate for tanks obtains a wide range of applications.The production technology of the spherical tank steel plate of high-parameters achieves significant progress, particularly the beginning of this century Heavy Plate Production equipment improvement, the production for higher category steel plate provides reliable guarantee.
But, along with the high speed development of various countries' national economy, large-scale high-parameters steel heavy plate for pressure vessels is had higher requirement.
For China, in existing GB19189 pressurized vessel quenched and tempered high tensile strength plate, maximum strength rank is 610MPa, and three grades of steel such as existing 07MnCrMoVR, 07MnNiMoVDR, 07MnNiMoDR, maximum use thickness is 60mm.Concrete plate property will ask for an interview to table 1.
Table 1GB19189 pressurized vessel quenched and tempered high tensile strength plate performance requriements
After 610MPa level ball steel plate for tanks is modified, its yield tensile ratio is higher, is greater than 0.95, is unfavorable for cold roll forming; Aging sensitivity factor C is comparatively large, degradation after steel plate cold working for the spherical tank that needs are cold-formed; Containing Cr element in steel plate, be unfavorable for that Large Heat Input Welding implemented by steel plate.
Along with the needs that large-size spherical tank manufactures, 610MPa level ball steel plate for tanks maximum ga(u)ge can not meet the needs of design, is badly in need of the spherical tank steel of more high intensity levels.690MPa level ball steel plate for tanks delivery technical qualification are in table 2, table 3.The element added if desired in chemical composition, must indicate after adding in quality certificate; Pcm is welding crack sensibility composition, by formula Pcm=C+Si/30+(Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B(%) calculate.When tension test detects when yield phenomenon is not obvious, adopt R
p0.2, quality certificate needs indicate.
Table 2690MPa level ball steel plate for tanks chemical composition (%)
Table 3690MPa level spherical tank mechanical property of steel plate and processing performance
Chinese Patent Application No. 201110117614.4 discloses one " tensile strength is greater than nuclear vessel steel and the production method of 690MPa level ", what relate generally to is nuclear vessel steel, require Cr0.10% ~ 0.30%, but the yield tensile ratio of steel plate, evenly extension are not required, only requires use properties during steel plate-20 DEG C simultaneously; Chinese Patent Application No. 200510047196.0 discloses one " high strength and low welding crack sensitivity Plate Steel and production method thereof ", Chinese Patent Application No. 200510047195.6 discloses one " thick steel plate with great line energy and low welding crack sensitivity and production method thereof ", Chinese Patent Application No. 200610018010.3 discloses one " low welding crack sensitivity steel plate and production method thereof ", the production method of what these three inventions related to is 610Mpa level steel plate, the yield tensile ratio of steel plate is high, and even extension is measured.
In a word, 610MPa level ball steel plate for tanks can not meet the needs that more high-parameters spherical tank manufactures, can not meet the requirement that spherical tank manufacture minimizing wall thickness reduces costs; After steel plate is modified, its yield tensile ratio is higher, is unfavorable for cold roll forming; Aging sensitivity factor C is comparatively large, degradation after steel plate cold working for the spherical tank that needs are cold-formed; Containing Cr element in steel plate, be unfavorable for that Large Heat Input Welding implemented by steel plate; Steel plate evenly extends low (evenly extending < 6%), and strength and ductility product is little, and the ability of opposing shock load is not high.
Summary of the invention
This patent purport has the production method providing a kind of spherical tank without the high-strength temper steel plate of Cr, and producing thickness is that 10 ~ 60mm easily welds, the 690MPa level of low yield strength ratio-50 DEG C of low temperature spherical tank High Strength Steel Plates, meets the demand of pressurized vessel spherical tank manufacturing.
Technical scheme of the present invention:
Spherical tank is without a production method for the high-strength temper steel plate of Cr, and processing step is converter steelmaking → ladle furnace refining → vacuum-treat → continuous casting → heating → rolling → quenching → tempering → service check → UT (Ultrasonic Testing).The percent mass of steel consists of: C=0.08 ~ 0.10, Si=0.15 ~ 0.40, Mn=1.45 ~ 1.60, P≤0.015, S≤0.003, V=0.04 ~ 0.50, Nb=0.015 ~ 0.025, Mo=0.3 ~ 0.40, Ni=0.40 ~ 0.60, B≤0.0008%, all the other are Fe and inevitable impurity element.Control Pcm≤0.21%, by formula Pcm=C+Si/30+(Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B(%) calculate;
Critical process step is:
A. converter (120 tons) is made steel: molten steel sulfur content controls at S≤0.020%, temperature >=1250 DEG C, and slag is taken off totally before entering converter by molten iron; Converter terminal control objectives is that C-T coordinates tapping P≤0.010%, S≤0.020%; Slag-stopping tapping slag is thick≤50mm, tapping time 4 ~ 7min; Tapping 1/5 adds alloy, and tapping 2/5 adds alloy; Squeeze into Al line after tapping and be no less than 300 ~ 350m deoxidation.
B. ladle furnace refining: ladle furnace refining: LF stove control molten steel conduction time >=20min, total argon blowing time >=40 minute, white slag hold-time >=15min; Feed Al line and adjust Alt, molten steel goes out to stand firm oxygen≤5ppm; Feed SiCa line or FeCa line 400 ~ 700m during departures, carry out the operation of soft blow argon to molten steel before departures, add Ti-Fe before soft blow, soft argon blowing time should be greater than 5min, adds B-Fe(if desired after soft blow terminates); VD stove controls molten steel and enters the omnidistance Argon of VD stove, total argon blowing time >=35 minute; Vacuumize below target 0.5tor, the hold-time is not less than 15min; Molten steel goes out the soft blow of VD stokehold and is greater than 12 minutes, continuous casting platform temperature 1553 ~ 1563 DEG C in departures.
C. continuous casting: molten steel overheat is less than 15 DEG C, liquidus temperature 1516 DEG C, tundish temperature 1526 ~ 1531 DEG C; Slab thickness 180,220,260, the maximum pulling rate of 300mm is respectively is 1.3,1.1,0.85,0.70m/min..
D. rolling: process furnace heating zone temperature 1220 ~ 1240 DEG C, soaking zone temperature 1200 ~ 1220 DEG C, slab adopts the heating of hot charging stove, rate of heating 6 ~ 10min/cm; Roughing
stage start rolling temperature>=1050 DEG C, finishing temperature>=980 DEG C, workpiece thickness is more than or equal to 3 times of finished product thicknesses,
stage rolling adopts large reduction system, has continuous 2 percentage pass reduction>=20% after ensureing broadening; Finish rolling
stage start rolling temperature 850 ~ 830 DEG C, finishing temperature 830 ~ 800 DEG C, several percentage pass reduction>=15% before finish rolling.
E. roller repairing: ACC enters water temp 775 DEG C ~ 800 DEG C, and ACC roller speed 2.0m/s, returns red 600 ~ 630 DEG C.
F. quench: quench at 900 ~ 930 DEG C of temperature, the time is thickness of slab mm × (1.5 ~ 2.0) min/mm, water-cooled cooling rate 35 ~ 45 DEG C/s; Tempering at 630 ~ 690 DEG C of temperature, the time is thickness of slab mm × (2.5-3.5) min/mm, air cooling.
UT (Ultrasonic Testing): carry out UT (Ultrasonic Testing) by GB2970
level is qualified.
Patent tool spherical tank of the present invention, without the feature of Cr high-strength hardened and tempered steel plate, is organized as tempering ferrite bainite+tempering acicular ferrite+a small amount of tempering granular bainite.Its know-why is the speed of cooling controlling quenching, thus reduces the yield tensile ratio of yield strength, reduction steel plate; The content of acicular ferrite after raising steel plate quenching, thus even extension when increasing substantially steel plate deformation; The Composition Design of below Pcm0.21%, improves the welding property of steel plate, and this steel plate can normal weld under the condition of not preheating and low preheating; Hot-cast base directly fills the fuel consumption reducing heating; Tensile strength brings up to 690MPa level, is thinned spherical tank wall thickness, reduces spherical tank manufacturing cost, thus realizes the theory of green iron and steel.
Therefore, with 610MPa level spherical tank with compared with High Strength Steel Plate technology, the present invention has the following advantages: armor plate strength brings up to 690MPa level, is thinned spherical tank wall thickness; Steel plate yield tensile ratio is less than 0.95, and uniform elongation is greater than 8%, and aging sensitivity significantly reduces, and the impact absorbing energy that steel plate meets relevant temperature brings up to the standard of more than 100J; Not adding the Composition Design of Cr, providing possibility for realizing Large Heat Input Welding; The Composition Design of below Pcm0.21%, ensure that the welding property of High Strength Steel Plate; The hot charging of continuously cast bloom reduces production cost.
Accompanying drawing explanation
Fig. 1, Fig. 2 are respectively XCF690L2 steel metallographic structure figure, the stress strain curve figure that the inventive method is produced.
Embodiment
The production method of embodiment 1:24mmXCF690L2 steel plate.
The chemical composition of steel is as table 4.
Table 4XCF690L2 steel plate composition actual achievement (%)
Critical process step is as follows:
A. molten steel sulfur content S≤0.020%, temperature >=1250 DEG C, slag is taken off totally before entering converter by molten iron.Converter terminal control objectives: C-T coordinates tapping, P=0.010%, S=0.018%; Strict slag-stopping tapping, slag is thick≤50mm, tapping time 7min, tapping 1/5 adds alloy, and tapping 2/5 adds alloy; Al line 320m deoxidation is squeezed into after tapping.
B. molten steel is at LF stove 25min conduction time, total argon blowing time 46 minutes, white slag hold-time 18min.Feed Al line and adjust Alt, argon station process molten steel terminates Als=0.040%, and molten steel goes out to stand firm oxygen 4ppm.Fe-Ca line is fed, feed quantity 520m during departures.Before departures, the operation of soft blow argon is carried out to molten steel, add Ti-Fe before soft blow, soft argon blowing time 7min.Molten steel entered VD stove and namely opens omnidistance Argon, the total argon blowing time of VD stove 39 minutes.Vacuumize 0.4tor, hold-time 16min.The compositions such as C, Si, Mn in molten steel are finely tuned.Molten steel goes out the soft blow of VD stokehold 20 minutes.The upper continuous casting platform temperature 1559 DEG C of molten steel departures.
C. tundish temperature 1530 DEG C, pulling rate 0.9m/min.Continuous casting becomes 260X2280 section slab.
D. process furnace heating zone temperature controls at 1230 ~ 1250 DEG C, and soaking zone temperature controls at 1220 ~ 1240 DEG C.Hot slab rate of heating 9min/cm.
stage start rolling temperature 1060 DEG C, finishing temperature 990 DEG C.Workpiece thickness 75mm, continuous 2 percentage pass reduction >=22%, finished product thickness 24mm.
stage start rolling temperature 850 DEG C, finishing temperature 820 DEG C.
E. roller repairing: ACC enters water temp 780 DEG C, and ACC roller speed 2.0m/s, returns red 600 DEG C.
F. quench: quench at 930 ± 10 DEG C of temperature 37min, water-cooled cooling rate 42 DEG C/s; Tempering 72min at 680 ± 10 DEG C of temperature, air cooling.
Actual measurement the present embodiment 24mm plate property: yield strength 687MPa, tensile strength 750MPa, yield tensile ratio 0.92, unit elongation 22.7%, uniform elongation 9.1% ,-50 DEG C of transverse impact merit Kv
2mean value 189J, aging sensitivity factor 11.1%(5% strain aging ballistic work mean value 168J), carry out UT (Ultrasonic Testing) by GB2970
level is qualified.
The production method of embodiment 2:60mmXCF690L2 steel plate.
The chemical composition of steel is as table 5.
Table 5XCF690L2 steel plate composition actual achievement (%)
Critical process step is as follows:
A. molten steel sulfur content S≤0.020%, temperature >=1250 DEG C, must take off slag totally before molten iron enters converter.Converter terminal control objectives: C-T coordinates tapping, P0.009%, S0.015%; Strict slag-stopping tapping, slag is thick≤50mm, tapping time 6min, tapping 1/5 adds alloy, and tapping 2/5 adds alloy; Al line 340m deoxidation is squeezed into after tapping.
B. molten steel is at LF stove 26min conduction time, total argon blowing time 44 minutes, white slag hold-time 17min.Feed Al line and adjust Alt, argon station process molten steel terminates Als0.042%, and molten steel goes out to stand firm oxygen 4ppm.Fe-Ca line is fed, feed quantity 600m during departures.Before departures, the operation of soft blow argon is carried out to molten steel, add Ti-Fe before soft blow, soft argon blowing time 9min, add B-Fe after soft blow terminates and amount to 8Kg.Molten steel entered VD stove and namely opens omnidistance Argon, the total argon blowing time of VD stove 37 minutes.Vacuumize 0.3tor, hold-time 17min.The compositions such as C, Si, Mn in molten steel are finely tuned.Molten steel goes out the soft blow of VD stokehold 18 minutes.The upper continuous casting platform temperature 1561 DEG C of molten steel departures.
C. tundish temperature 1528 DEG C, pulling rate 0.9m/min.Continuous casting becomes 260X2280 section slab.
D. process furnace heating zone temperature controls at 1230 ~ 1250 DEG C, and soaking zone temperature controls at 1220 ~ 1240 DEG C.Hot slab rate of heating 8.5min/cm.
stage start rolling temperature 1050 DEG C, finishing temperature 980 DEG C.Workpiece thickness 140mm, continuous 2 percentage pass reduction >=21%, finished product thickness 60mm.
stage start rolling temperature 838 DEG C, finishing temperature 815 DEG C.
E. roller repairing: ACC enters water temp 782 DEG C, and ACC roller speed 2.0m/s, returns red 613 DEG C.
F. quench: quench at 930 ± 10 DEG C of temperature 96min, water-cooled cooling rate 43 DEG C/s; Tempering 184min at 670 ± 10 DEG C of temperature, air cooling.
Actual measurement the present embodiment 60mm plate property: yield strength 667MPa, tensile strength 728MPa, yield tensile ratio 0.92, unit elongation 22.8%, uniform elongation 8.9% ,-50 DEG C of transverse impact merit Kv
2mean value 196J, aging sensitivity factor 10.7%(5% strain aging ballistic work mean value 175J), carry out UT (Ultrasonic Testing) by GB2970
level is qualified.
Claims (1)
1. the production method of spherical tank without Cr high-strength hardened and tempered steel plate, is characterized in that: the percent mass of steel consists of: C=0.08 ~ 0.10, Si=0.15 ~ 0.40, Mn=1.45 ~ 1.60, P≤0.015, S≤0.003, V=0.04 ~ 0.042, Nb=0.015 ~ 0.025, Mo=0.3 ~ 0.40, Ni=0.40 ~ 0.60, B≤0.0008, all the other are Fe and inevitable impurity element, and control Pcm≤0.21, by formula Pcm=C+Si/30+(Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B(%) calculate; Critical process step is:
A. converter steelmaking: molten steel sulfur content controls at S≤0.020%, temperature >=1250 DEG C, slag is taken off totally before entering converter by molten iron; Converter terminal control objectives is that C-T coordinates tapping P≤0.010%, S≤0.020%; Slag-stopping tapping slag is thick≤50mm, tapping time 4 ~ 7min; Tapping 1/5 adds alloy, and tapping 2/5 adds alloy; Al line 300 ~ 350m deoxidation is squeezed into after tapping;
B. ladle furnace refining: LF stove control molten steel conduction time >=20min, total argon blowing time >=40 minute, white slag hold-time >=15min; Feed Al line and adjust Alt, molten steel goes out to stand firm oxygen≤5ppm; Feed SiCa line or FeCa line 400 ~ 700m during departures, carry out the operation of soft blow argon to molten steel before departures, add Ti-Fe before soft blow, soft argon blowing time should be greater than 5min, adds B-Fe after soft blow terminates; VD stove controls molten steel and enters the omnidistance Argon of VD stove, total argon blowing time >=35 minute; Vacuumize below target 0.5tor, the hold-time is not less than 15min; Molten steel goes out the soft blow of VD stokehold and is greater than 12 minutes, continuous casting platform temperature 1553 ~ 1563 DEG C in departures;
C. continuous casting: molten steel overheat is less than 15 DEG C, liquidus temperature 1516 DEG C, tundish temperature 1526 ~ 1531 DEG C; The maximum pulling rate of slab thickness 180mm, 220mm, 260mm, 300mm is respectively 1.3m/min., 1.1m/min., 0.85m/min., 0.70m/min.;
D. rolling: process furnace heating zone temperature 1220 ~ 1240 DEG C, soaking zone temperature 1200 ~ 1220 DEG C, slab adopts the heating of hot charging stove, rate of heating 6 ~ 10min/cm; Roughing
stage start rolling temperature>=1050 DEG C, finishing temperature>=980 DEG C, workpiece thickness is more than or equal to 3 times of finished product thicknesses,
stage rolling adopts large reduction system, has continuous 2 percentage pass reduction>=20% after ensureing broadening; Finish rolling
stage start rolling temperature 850 ~ 830 DEG C, finishing temperature 830 ~ 800 DEG C, several percentage pass reduction>=15% before finish rolling;
E. roller repairing: ACC enters water temp 775 DEG C ~ 800 DEG C, and ACC roller speed 2.0m/s, returns red 600 ~ 630 DEG C;
F. quench: quench at 900 ~ 930 DEG C of temperature, the time is thickness of slab mm × (1.5 ~ 2.0) min/mm, water-cooled cooling rate 35 ~ 45 DEG C/s; Tempering at 630 ~ 690 DEG C of temperature, the time is thickness of slab mm × (2.5-3.5) min/mm, air cooling.
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| CN104818361A (en) * | 2015-05-14 | 2015-08-05 | 湖南华菱湘潭钢铁有限公司 | Method for adding ferrotitanium in steelmaking process |
| CN111778451A (en) * | 2020-06-24 | 2020-10-16 | 南京钢铁股份有限公司 | 07MnNiMoDR steel plate for spherical tank and production process |
| CN113862549B (en) * | 2021-09-16 | 2023-03-24 | 湖南华菱湘潭钢铁有限公司 | Production method of L360QS hydrogen transmission pipeline steel |
| CN117026093A (en) * | 2023-09-16 | 2023-11-10 | 湖南华菱湘潭钢铁有限公司 | Steel for low-surface-hardness spherical tank and production method thereof |
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| CN101050504A (en) * | 2007-05-10 | 2007-10-10 | 武汉科技大学 | Soldering not quenching and tempering steel plate in high intensity by large line energy, and manufacturing method |
| KR20090070501A (en) * | 2007-12-27 | 2009-07-01 | 주식회사 포스코 | High manganese high strength steel sheets with excellent fatigue resistance and manufacturing method thereof |
| CN102383055A (en) * | 2011-11-10 | 2012-03-21 | 武汉钢铁(集团)公司 | Production method for reducing titanium content in high-carbon chromium bearing steel |
| CN103233178A (en) * | 2013-05-13 | 2013-08-07 | 湖南华菱湘潭钢铁有限公司 | Production method of formable high-strength medium-thickness steel plate |
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| CN101050504A (en) * | 2007-05-10 | 2007-10-10 | 武汉科技大学 | Soldering not quenching and tempering steel plate in high intensity by large line energy, and manufacturing method |
| KR20090070501A (en) * | 2007-12-27 | 2009-07-01 | 주식회사 포스코 | High manganese high strength steel sheets with excellent fatigue resistance and manufacturing method thereof |
| CN102383055A (en) * | 2011-11-10 | 2012-03-21 | 武汉钢铁(集团)公司 | Production method for reducing titanium content in high-carbon chromium bearing steel |
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