CN104480393B - Oil groove tank car TC128GrB steel plate and production method thereof - Google Patents
Oil groove tank car TC128GrB steel plate and production method thereof Download PDFInfo
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Abstract
A kind of oil groove tank car TC128GrB steel plate and production method thereof, composition by weight: C 0.14%～0.24%, Si 0.15%～0.50%, Mn 1.30%～1.65%, P≤0.015%, S≤0.005%, Cu≤0.30%, V 0.020%～0.10%, Nb 0.005%～0.020%, Ti≤0.020%, Al 0.020%～0.050%, Cev≤0.53%, surplus is Fe and inevitable impurity；Cev=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15.Yield strength Rp0.2>=345MPa, tensile strength Rm >=560MPa, elongation percentage A50>=22%, 45.6 horizontal DEG C >=30.3J.Mechanical property is better than the tank car steel standard to TC128GrB steel；Production cost is low.
Description
Technical field
The present invention relates to a kind of tank car steel, especially a kind of oil groove tank car TC128GrB steel plate and production method thereof.
Background technology
From the sixties in 20th century, the tank body steel of China's liquid gas truck tank uses the relatively low Q345R steel of intensity rank (tensile strength Rm is 500MPa level) mostly, cause tank body wall thickness thicker, cause that existing truck tank ratio of light weight to loading capacity is big, volume to weight ratio is little, delivery efficiency low, thus limit maximization (high parameter) development of domestic liquid gas truck tank.Compared with Foreign Advanced Lerel, the ratio of light weight to loading capacity of China's truck tank is higher by 30% than the advanced countries such as Japan and America and Europe.Therefore, thinning, reduction tank body weight and raising armor plate strength, be a direction of China's tank car exploitation.
TC128GrB steel plate is a kind of high strength carbon manganese type oil groove plate, and tensile strength, at more than 560Mpa, is mainly used in the end socket position of oil groove tank car.Existing TC128GrB steel plate exists that production difficulty is big, price is higher and can only ensure the weak point of-20 DEG C of side knock merits.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of low cost, high performance oil groove tank car TC128GrB steel plate；Present invention also offers the production method of a kind of oil groove tank car TC128GrB steel plate.
For solving above-mentioned technical problem, the technical solution used in the present invention is: it is made up of the chemical composition of following weight percent: C 0.14%～0.24%, Si 0.15%～0.50%, Mn 1.30%～1.65%, P≤0.015%, S≤0.005%, Cu≤0.30%, V 0.020%～0.10%, Nb 0.005%～0.020%, Ti≤0.020%, Al 0.020%～0.050%, carbon equivalent Cev≤0.53%, surplus is Fe and inevitable impurity；Wherein Cev=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15.
Steel plate tissue of the present invention is mainly ferrite, pearlite and bainite.
The inventive method includes heating, rolling and heat treatment step, and described heating process uses the steel billet of the chemical composition of following weight percent: C 0.14%～0.24%, Si 0.15%～0.50%, Mn 1.30%～1.65%, P≤0.015%, S≤0.005%, Cu≤0.30%, V 0.020%～0.10%, Nb 0.005%～0.020%, Ti≤0.020%, Al 0.020%～0.050%, carbon equivalent Cev≤0.53%, surplus is Fe and inevitable impurity；Wherein Cev=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15.
Heating process described in the inventive method: maximum heating temperature≤1250 DEG C, firing rate >=1.0min/mm, soaking zone temperature 1220 DEG C～1240 DEG C, soaking zone heat time heating time >=90min.
Rolling process described in the inventive method: use II type controlled rolling process；First stage rolls between 950 DEG C～1100 DEG C, and this stage reduction in pass is 10%～25%, to ensure that steel plate not wooden dipper is bent, and accumulative reduction ratio >=70%；Start rolling temperature≤900 DEG C of second stage, finishing temperature≤820 DEG C, accumulative reduction ratio >=30%；Roll rear steel plate quickly to cool down, red temperature 650 DEG C～700 DEG C.
Heat treatment step described in the inventive method: heating-up temperature 900 DEG C ± 10 DEG C, total heat time heating time 30min～50min；After normalizing, steel plate is through air-cooled process 10min.
The tank car of present invention steel TC128GrB uses C-Mn-Cu-V system microalloy element complex intensifying, has good obdurability coupling and welding performance.The development of high-strength steel is the process gradually reducing carbon content, the reduction of carbon content, on the one hand be conducive to improving the toughness of steel, on the other hand the welding performance of steel can be significantly improved, in the present invention, carbon content is 0.14～0.24%, is suitable for the large-scale steel structure members that the stress of needs more high tenacity and welding performance is complicated.In the present invention, Si content is between 0.15～0.50%, Si mainly with solution strengthening form improve steel intensity, but can not too high levels, in order to avoid reduce steel toughness.Cu appropriate in the present invention can make steel plate sample through long-time die welding process after, precipitation strength steel matrix；Thus it is too fast to avoid steel mould deposited strength index to decline.In the present invention, V content is 0.02～0.10%, and V is after controlled rolling, and C, N compound of V separates out, and can strongly improve steel plate and obtain intensity.The present invention there was added a small amount of Nb, beneficially controlled rolling, reduce the size of C, N compound precipitate of V.In the present invention, impurity element P, S equal size lower limit does not limits, and reduces as far as possible under process equipment ability, to reach the steel uniform purpose of pure mechanical property.
The inventive method uses C-Mn-Cu-V system microalloy element complex intensifying, through rational Technology for Heating Processing, it is thus achieved that good obdurability coupling, does not the most reduce the welding performance of steel plate simultaneously.The inventive method is used to carry out producing and achieve relatively low carbon equivalent and the Design of Chemical Composition of microalloy content, the strict strand that controls heats, rolls and cooling parameter, steel plate is after normalized treatment, not only obtained every mechanical performance index that technical conditions require but also reduced production cost, having obtained more tiny organizational structure and more preferably welding performance simultaneously.
Use and have the beneficial effects that produced by technique scheme: the present invention uses the mentality of designing of C-Mn-Cu-V on composition designs, and high-carbon, microalloy content are relatively low and with low cost；Tough coupling, yield strength is at more than 355MPa, and tensile strength is 560～about 690MPa, and steel plate is less with plate difference；-45.6 DEG C of vertical, horizontal ballistic works are more than 30 joules, low-temperature good toughness；The conventional mechanical property of the steel plate of the present invention and high temperature die welding performance reach following requirements after testing: yield strength Rp0.2>=345MPa, tensile strength Rm >=560MPa, elongation percentage A50>=22% ,-45.6 horizontal DEG C >=30.3J.Steel mechanical property of the present invention fully meets tank car steel to the standard-required of TC128GrB steel and has sizable surplus；And the precious metal content added is few (particular without adding Ni alloy), and production cost is relatively low.
The steel plate Design of Chemical Composition of the present invention uses cheap carbon, manganese solution strengthening, the precipitation strength effect of copper, by reasonable heat treating regime, obtain ferrite, pearlitic structrure and a certain proportion of bainite, surface of steel plate bainite layer is few, and grain size 9 grades, with first-class requirement, solves high intensity, strength problem after high impact toughness and steel plate hot molding, impact temperature reaches-45.6 DEG C.The inventive method guarantees that under the conditions of less precious alloy usage amount mechanical property of steel plate is good and template, and steel plate thickness allowance control is accurate, at-0.7mm～+0.3mm, steel plate thickness≤25.4mm；Make steel plate have good tissue, combination property and welding performance, and technique is simple, easily operated.
Accompanying drawing explanation
The present invention is further detailed explanation with detailed description of the invention below in conjunction with the accompanying drawings.
Fig. 1 is 100 microns of macrograph of steel plate of the present invention；
Fig. 2 is 20 microns of macrograph of steel plate of the present invention；
Fig. 3 is the as-welded 100 microns of macrograph of steel mould of the present invention；
Fig. 4 is the as-welded 20 microns of macrograph of steel mould of the present invention.
Detailed description of the invention
Embodiment 1: this oil groove tank car TC128GrB steel plate uses following method to produce.
(1) chemical composition (weight) of steel billet is: C 0.15%, Si 0.15%, Mn 1.65%, P 0.012%, S
0.002%, Cu 0.25%, V 0.095%, Nb 0.006%, Ti 0.016%, Al 0.032%, Cev 0.46%, surplus is Fe and is inevitably mingled with.In order to avoid bursting occurs in Hi-Stren steel base surface, steel billet requires stacking more than 24 hours, discharges stress.
(2) this oil groove tank car TC128GrB steel plate uses following processing step to produce:
A, heating technique: steel billet shove charge after stacking 30 hours；Low temperature slow heat, maximum heating temperature 1250 DEG C, it is ensured that steel billet burns uniformly thoroughly, firing rate 1.5min/mm(i.e. heats calculating in 1.5 minutes by every mm of thickness steel plate), soaking zone temperature 1220 DEG C～1240 DEG C, soaking zone 120min heat time heating time, it is ensured that ingot blank burns uniformly thoroughly.
B, rolling mill practice: use II type controlled rolling process；First stage rolls at 1100 DEG C, and this stage most of reduction in pass is 10%, accumulative reduction ratio 70%, makes austenite generation perfect recrystallization, with fining austenite grains；Second stage is the austenite non-recrystallization stage, start rolling temperature 900 DEG C, finishing temperature 820 DEG C, accumulative reduction ratio 50%.Roll rear steel plate to enter ACC and quickly cool down, red temperature 670 DEG C.
C, steel plate are walked to shear line after rolling, and excision steel plate is bilateral.
D, Technology for Heating Processing: heating-up temperature 900 DEG C ± 10 DEG C, total heat time heating time 35min；After normalizing, steel plate, through air-cooled process 10min, i.e. can get described TC128GrB steel plate.
Fig. 1 sees in the organization charts of the present embodiment gained TC128GrB steel plate, 2；Being organized as pearlite+ferrite+bainite+martensite (a small amount of, to be distributed in banded structure) from Fig. 1 and Fig. 2, this TC128GrB steel plate, even tissue, the grain size of tissue is about 9.5 grades.
The conventional mechanical property of the present embodiment gained TC128GrB steel plate: yield strength 430MPa；Tensile strength: 615MPa；Extend: 32%；-45.6 DEG C of ballistic work AKV(are horizontal) 73,89,102J；-45.6 DEG C of ballistic work AKV(are longitudinally) 113J, 122J, 117J.
The steel plate die welding performance of the present embodiment gained TC128GrB steel plate: yield strength 456MPa；Tensile strength: 590MPa；Extend: 34%；-45.6 DEG C of ballistic work AKV(are horizontal) 112J, 122J, 134J；-45.6 DEG C of ballistic work AKV(are longitudinally) 163J, 152J, 147J.
Steel mould degree of the being welded during detection of above-mentioned steel plate die welding performance is: normalizing 900 DEG C, is incubated 30 minutes, air cooling of coming out of the stove；It is tempered 600 DEG C, is incubated 60 minutes, steel plate sample charging temperature≤400 DEG C.Furnace temperature when 427 DEG C～600 DEG C, programming rate≤200 DEG C/h, 600 DEG C～427 DEG C of cooling rate≤260 DEG C/h, come out of the stove air cooling with lower steel plate for 427 DEG C.
Fig. 3, Fig. 4 are this TC128GrB steel mould as-welded 100 microns and macrograph of 20 microns, and from photo, steel plate is after die welding heat treatment, and steel plate is organized as pearlite+ferrite+tempering bainite, even tissue, and the grain size of tissue is about 9.5 grades.
Embodiment 2: this oil groove tank car TC128GrB steel plate uses following method to produce.
(1) chemical composition (weight) of steel billet is: C 0.16%, Si 0.37%, Mn 1.55%, P 0.011%, S
0.004%, Cu 0.18%, V 0.070%, Nb 0.017%, Ti 0.011%, Al 0.020%, Cev 0.44%, surplus is Fe and is inevitably mingled with.In order to avoid bursting occurs in Hi-Stren steel base surface, steel billet requires stacking more than 24 hours, discharges stress.
(2) this oil groove tank car TC128GrB steel plate uses following processing step to produce:
A, heating technique: steel billet shove charge after stacking 30 hours；Low temperature slow heat, maximum heating temperature 1245 DEG C, it is ensured that steel billet burns uniformly thoroughly, firing rate 2.0min/mm, soaking zone temperature 1220 DEG C～1230 DEG C, soaking zone 100min heat time heating time, it is ensured that ingot blank burns uniformly thoroughly.
B, rolling mill practice: use II type controlled rolling process；First stage rolls at 1100 DEG C, and this stage most of reduction in pass is 25%, accumulative reduction ratio 75%, makes austenite generation perfect recrystallization, with fining austenite grains；Second stage is the austenite non-recrystallization stage, start rolling temperature 900 DEG C, finishing temperature 800 DEG C, accumulative reduction ratio 40%.Roll rear steel plate to enter ACC and quickly cool down, red temperature 700 DEG C.
C, steel plate are walked to shear line after rolling, and excision steel plate is bilateral.
D, Technology for Heating Processing: heating-up temperature 900 DEG C ± 10 DEG C, total heat time heating time 30min；After normalizing, steel plate, through air-cooled process 10min, i.e. can get described TC128GrB steel plate.
The present embodiment gained TC128GrB steel plate be organized as pearlite+ferrite+bainite+martensite (a small amount of, be distributed in banded structure), even tissue, the grain size of tissue is about 9.5 grades.
The conventional mechanical property of the present embodiment gained TC128GrB steel plate: yield strength 445MPa；Tensile strength: 631MPa；Extend: 31%；-45.6 DEG C of ballistic work AKV(are horizontal) 68,82,99J；-45.6 DEG C of ballistic work AKV(are longitudinally) 119J, 112J, 115J.
The present embodiment gained TC128GrB steel plate is after die welding heat treatment, and steel plate is organized as pearlite+ferrite+tempering bainite, even tissue, and the grain size of tissue is about 9.5 grades.
The steel plate die welding performance of the present embodiment gained TC128GrB steel plate: yield strength 466MPa；Tensile strength: 605MPa；Extend: 34%；-45.6 DEG C of ballistic work AKV(are horizontal) 102J, 99J, 124J；-45.6 DEG C of ballistic work AKV(are longitudinally) 154J, 134J, 129J.
Embodiment 3: this oil groove tank car TC128GrB steel plate uses following method to produce.
(1) chemical composition (weight) of steel billet is: C 0.23%, Si 0.40%, Mn 1.32%, P 0.008%, S
0.005%, Cu 0.05%, V 0.065%, Nb 0.010%, Ti 0.002%, Al 0.021%, Cev 0.48%, surplus is Fe and is inevitably mingled with.In order to avoid bursting occurs in Hi-Stren steel base surface, steel billet requires stacking more than 24 hours, discharges stress.
(2) this oil groove tank car TC128GrB steel plate uses following processing step to produce:
A, heating technique: steel billet shove charge after stacking 30 hours；Low temperature slow heat, maximum heating temperature 1250 DEG C, it is ensured that steel billet burns uniformly thoroughly, firing rate 1.0min/mm, soaking zone temperature 1230 DEG C～1240 DEG C, soaking zone 150min heat time heating time, it is ensured that ingot blank burns uniformly thoroughly.
B, rolling mill practice: use II type controlled rolling process；First stage rolls at 950 DEG C, and this stage most of reduction in pass is 25%, accumulative reduction ratio 80%, makes austenite generation perfect recrystallization, with fining austenite grains；Second stage is the austenite non-recrystallization stage, start rolling temperature 880 DEG C, finishing temperature 820 DEG C, accumulative reduction ratio 45%.Roll rear steel plate to enter ACC and quickly cool down, red temperature 650 DEG C.
C, steel plate are walked to shear line after rolling, and excision steel plate is bilateral.
D, Technology for Heating Processing: heating-up temperature 900 DEG C ± 10 DEG C, total heat time heating time 45min；After normalizing, steel plate, through air-cooled process 10min, i.e. can get described TC128GrB steel plate.
The present embodiment gained TC128GrB steel plate be organized as pearlite+ferrite+bainite+martensite (a small amount of, be distributed in banded structure), even tissue, the grain size of tissue is about 10.5 grades.
The conventional mechanical property of the present embodiment gained TC128GrB steel plate: yield strength 435MPa；Tensile strength: 620MPa；Extend: 30%；-45.6 DEG C of ballistic work AKV(are horizontal) 93,79,92J；-45.6 DEG C of ballistic work AKV(are longitudinally) 119J, 132J, 107J.
The present embodiment gained TC128GrB steel plate is after die welding heat treatment, and steel plate is organized as pearlite+ferrite+tempering bainite, even tissue, and the grain size of tissue is about 10.0 grades.
The steel plate die welding performance of the present embodiment gained TC128GrB steel plate: yield strength 456MPa；Tensile strength: 590MPa；Extend: 34%；-45.6 DEG C of ballistic work AKV(are horizontal) 112J, 122J, 134J；-45.6 DEG C of ballistic work AKV(are longitudinally) 163J, 152J, 147J.
Embodiment 4: this oil groove tank car TC128GrB steel plate uses following method to produce.
(1) chemical composition (weight) of steel billet is: C 0.16%, Si 0.15%, Mn 1.65%, P 0.010%, S
0.001%, Cu 0.30%, V 0.060%, Nb 0.020%, Ti 0.020%, Al 0.048%, Cev 0.47%, surplus is Fe and is inevitably mingled with.In order to avoid bursting occurs in Hi-Stren steel base surface, steel billet requires stacking more than 24 hours, discharges stress.
(2) this oil groove tank car TC128GrB steel plate uses following processing step to produce:
A, heating technique: steel billet shove charge after stacking 30 hours；Low temperature slow heat, maximum heating temperature 1245 DEG C, it is ensured that steel billet burns uniformly thoroughly, firing rate 1.8min/mm, soaking zone temperature 1220 DEG C～1230 DEG C, soaking zone 90min heat time heating time, it is ensured that ingot blank burns uniformly thoroughly.
B, rolling mill practice: use II type controlled rolling process；First stage rolls at 1000 DEG C, and this stage most of reduction in pass is 10%, accumulative reduction ratio 70%, makes austenite generation perfect recrystallization, with fining austenite grains；Second stage is the austenite non-recrystallization stage, start rolling temperature 840 DEG C, finishing temperature 750 DEG C, accumulative reduction ratio 30%.Roll rear steel plate to enter ACC and quickly cool down, red temperature 650 DEG C.
C, steel plate are walked to shear line after rolling, and excision steel plate is bilateral.
D, Technology for Heating Processing: heating-up temperature 900 DEG C ± 10 DEG C, total heat time heating time 50min；After normalizing, steel plate, through air-cooled process 10min, i.e. can get described TC128GrB steel plate.
The present embodiment gained TC128GrB steel plate be organized as pearlite+ferrite+bainite+martensite (a small amount of, be distributed in banded structure), even tissue, the grain size of tissue is about 10.0 grades.
The conventional mechanical property of the present embodiment gained TC128GrB steel plate: yield strength 452MPa；Tensile strength: 655MPa；Extend: 30%；-45.6 DEG C of ballistic work AKV(are horizontal) 63,89,92J；-45.6 DEG C of ballistic work AKV(are longitudinally) 103J, 132J, 127J.
The present embodiment gained TC128GrB steel plate is after die welding heat treatment, and steel plate is organized as pearlite+ferrite+tempering bainite, even tissue, and the grain size of tissue is about 9.5 grades.
The steel plate die welding performance of the present embodiment gained TC128GrB steel plate: yield strength 478MPa；Tensile strength: 610MPa；Extend: 34%；-45.6 DEG C of ballistic work AKV(are horizontal) 102J, 92J, 114J；-45.6 DEG C of ballistic work AKV(are longitudinally) 153J, 149J, 147J.
Claims (3)
1. an oil groove tank car TC128GrB steel plate, it is characterised in that it is made up of the chemical composition of following weight percent: C 0.14%～0.24%, Si 0.15%～0.50%, Mn 1.30%～1.65%, P≤0.015%, S≤0.005%, Cu≤0.30%, V 0.020%～0.10%, Nb 0.005%～0.020%, Ti≤0.020%, Al 0.020%～0.050%, Cev≤0.53%, surplus is Fe and inevitable impurity；Described steel plate tissue is mainly ferrite, pearlite and bainite.
2. an oil groove tank car production method for TC128GrB steel plate, it includes heating, rolling and heat treatment step, it is characterised in that the steel billet of the chemical composition of described heating process employing following weight percent: C 0.14%～0.24%, Si
0.15%～0.50%, Mn 1.30%～1.65%, P≤0.015%, S≤0.005%, Cu≤0.30%, V 0.020%～0.10%, Nb
0.005%～0.020%, Ti≤0.020%, Al 0.020%～0.050%, Cev≤0.53%, surplus is Fe and inevitable impurity；
Described heating process: maximum heating temperature≤1250 DEG C, firing rate >=1.0min/mm, soaking zone temperature 1220 DEG C～1240 DEG C, soaking zone heat time heating time >=90min；
Described heat treatment step: heating-up temperature 900 DEG C ± 10 DEG C, total heat time heating time 30min～50min；After normalizing, steel plate is through air-cooled process 10min.
The production method of oil groove tank car TC128GrB steel plate the most according to claim 2, it is characterised in that described rolling process: use II type controlled rolling process；First stage rolls between 950 DEG C～1100 DEG C, and this stage reduction in pass is 10%～25%, accumulative reduction ratio >=70%；Start rolling temperature≤900 DEG C of second stage, finishing temperature≤820 DEG C, accumulative reduction ratio >=30%；Roll rear steel plate quickly to cool down, red temperature 650 DEG C～700 DEG C.
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| CN104878294A (en) * | 2015-05-20 | 2015-09-02 | 舞阳钢铁有限责任公司 | P440NL1 steel plate for oil groove tank car and production method of P440NL1 steel plate |
| CN105441793A (en) * | 2015-11-30 | 2016-03-30 | 舞阳钢铁有限责任公司 | High-strength carbon manganese steel plate for extra-wide tank car and production method of steel plate |
| CN106957987A (en) * | 2017-04-21 | 2017-07-18 | 舞阳钢铁有限责任公司 | A kind of boiler vessel Q345R steel plates and its normalizing heat treatment method |
| CN109338215B (en) * | 2018-10-15 | 2020-10-30 | 江阴兴澄特种钢铁有限公司 | High-strength steel plate with thickness of 8-25 mm and low yield ratio for tank car and manufacturing method thereof |
| WO2020115537A1 (en) * | 2018-12-07 | 2020-06-11 | Arcelormittal | Low-carbon, high toughness, steel plates for pressurized tank car applications |
| CN112553519B (en) * | 2020-11-13 | 2021-12-10 | 柳州钢铁股份有限公司 | Manufacturing method of Q420GJ medium steel plate for low-yield-ratio, low-cost and high-performance building structure |
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