CN104962828A - Large-thickness SA738GrA steel plate and production method thereof - Google Patents
Large-thickness SA738GrA steel plate and production method thereof Download PDFInfo
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Abstract
The invention discloses a large-thickness SA738GrA steel plate and a production method thereof. The large-thickness SA738GrA steel plate comprises, by weight, 0.14-0.16% of C, 0.25-0.45% of Si, 1.35-1.45% of Mn, smaller than or equal to 0.020% of P, smaller than or equal to 0.010% of S, 0.15-0.20% of Cr, smaller than or equal to 0.06% of Mo, smaller than or equal to 0.02% of Ti, 0.20-0.30% of Ni, smaller than or equal to 0.05% of Cu, 0.020-0.050% of Al, smaller than or equal to 0.07% of V, smaller than or equal to 0.04% of Nb, smaller than or equal to 0.07% of Nb+V and the balance Fe and inevitable impurities. According to the steel plate, the element constituents and the ratio in the steel plate are optimized so that the thickness of the SA738GrA steel plate can reach 112 mm. The steel plate obtained through the method meets the requirement for the level B in the ASME SA578/SA578M flaw detection standard; strength is high, the yield strength is 310 MPa or higher, and the tensile strength is 515 MPa-655 MPa; impact energy at the temperature of minus 46 DEG C is larger than 27 J. The steel plate has the characters of being high in purity, even in component and compact in interior and is suitable for manufacturing of key equipment parts such as a centrifugal compressor.
Description
Technical field
The present invention relates to a kind of steel heavy plate for pressure vessels, especially a kind of heavy thickness SA738GrA steel plate and production method thereof.
Background technology
Along with the development of oil and gas industry, the requirement of the industries such as petrochemical industry to the performance of facing hydrogen pressure Vessel Steels improves constantly, also get up harsher to the performance requriements of device fabrication steel plate, except usually more and more higher to the requirement of low-temperature flexibility, along with the maximization of equipment, to the anti-adverse environment of equipment and the requirement of extreme environment also more and more higher.For meeting the demand of landification equipment manufacturing for quality plate, need to develop the Cr-Mo steel grade with performances such as the good anti-temper embrittlement of resistant to hydrogen burn into, creep resistance are brittle, with meet hydrogenator for a long time high temperature, high pressure, face hydrogen environment under the demand that works.In heavy thickness, the successful exploitation of SA738GrA steel plate of low-temperature hydro pressurized vessel, under present steel situation, as novel pressure Vessel Steels, plays irreplaceable vital role.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of high-quality heavy thickness SA738GrA steel plate; Present invention also offers a kind of production method of heavy thickness SA738GrA steel plate.
For solving the problems of the technologies described above, the present invention is grouped into by the one-tenth of following weight percent: C 0.14 ~ 0.16%, Si 0.25 ~ 0.45%, Mn 1.35 ~ 1.45%, P≤0.020%, S≤0.010%, Cr 0.15 ~ 0.20%, Mo≤0.06%, Ti≤0.02%, Ni 0.20 ~ 0.30%, Cu≤0.05%, Al 0.020 ~ 0.050%, V≤0.07%, Nb≤0.04%, Nb+V≤0.07%, surplus is Fe and inevitable impurity.
Steel plate thickness of the present invention is 112mm.
In the present invention: C content is that main and other elements of 0.14 ~ 0.16%, C form carbide, plays build up and precipitation strength, armor plate strength is increased; The content of Mn, 1.35 ~ 1.45%, mainly plays solution strengthening, reduces transformation temperature and improve armor plate strength; The content of Ni is 0.20 ~ 0.30%, and Main Function increases austenitic condensate depression, thus thinning microstructure, obtain strengthening effect, increase the atmospheric corrosion resistance ability of steel, improve low-temperature impact toughness simultaneously and reduce Cold Brittleness Transition Temperature; Cr content 0.15 ~ 0.20%, Mo≤0.06%, can significantly improve the hardening capacity of steel, can improve temper resistance simultaneously; Impurity element P, S equal size lower limit does not limit, and reduces as far as possible under processing unit ability, and to reach, steel is pure, the object of good mechanical properties.
The inventive method comprises smelting, casting, heating, rolling, roller repairing and heat treatment step, and the weight percentage of described smelting procedure tapping molten steel composition is described above;
Described heating process: soaking pit heating maximum heating temperature 1280 DEG C, soaking temperature 1240 DEG C ~ 1260 DEG C;
Described rolling process: adopt two-phase control rolling technique; First stage start rolling temperature is 1050 DEG C ~ 1100 DEG C, and this stage single pass draught is 15% ~ 25%, and accumulative draft is 35% ~ 50%; Subordinate phase rolling temperature≤890 DEG C, the steel thickness that dries in the air is 1.5 times of steel plate thickness, and accumulative draft is 30% ~ 55%, and single pass draft >=10% is no less than 3 passages;
Described roller repairing operation: steel plate rolls rear water-cooled, red temperature 690 DEG C ~ 710 DEG C; Then the stacking that rolls off the production line cool, surface of steel plate temperature >=450 DEG C, stacking total time >=72h;
Heat treatment step: quenching+tempering process; During quench treatment, quenching temperature 910 ± 10 DEG C, soaking time PLC+20min, utilize maximum amount of water to carry out water-cooled accelerating cooling after quenching; During temper, tempering temperature 640 ~ 650 DEG C, soaking time 3 ~ 4min/mm, can obtain described heavy thickness SA738GrA steel plate after tempering.
The beneficial effect adopting technique scheme to produce is: the basis of the SA738GrA plate specification that the present invention formulates in ASME standard is improved, optimize each elementary composition and proportioning in steel plate, make the thickness of SA738GrA steel plate reach 112mm, ensure that every mechanical property of steel plate all meets the requirement in ASME standard simultaneously.
The steel plate condition of delivery that the inventive method is produced is quenching+tempering, meets the requirement of B level in ASME SA578/SA578M non-destructive testing standard; Intensity is higher, and yield strength is at more than 310MPa, and tensile strength is between 515MPa ~ 655MPa;-46 DEG C of ballistic works are greater than 27 joules; Steel plate has that purity is higher, the feature of uniform composition, interior solid, and mechanical property meets standard-required completely, is suitable for manufacturing the key equipment parts such as centrifugal compressor.
Embodiment
Below in conjunction with specific embodiment, the present invention is further detailed explanation.
This heavy thickness SA738GrA steel plate adopts the production method of following step to produce:
(1) smelting procedure:
A, just refining: prioritizing selection high-quality material is smelted at electric furnace, avoids seeing slag during tapping;
B, refining: molten steel is loaded the refining of LF stove, adjust each elemental composition; Refining total time >=60min, white slag hold-time >=30min, guarantee that slag making is good; Lime consumption >=15kg/t steel, to ensure refining effect;
C, vacuum-treat: the molten steel after refining is proceeded to vacuum degassing furnace (VD stove) and carry out vacuum-treat, before vacuum, add Ca-Si block 165kg/ stove; Below vacuum tightness 66Pa hold-time >=20min, bull ladle after soft blow 5min; The weight percentage of tapping molten steel composition is: C 0.14 ~ 0.16%, Si 0.25 ~ 0.45%, Mn 1.35 ~ 1.45%, P≤0.020%, S≤0.010%, Cr 0.15 ~ 0.20%, Mo≤0.06%, Ti≤0.02%, Ni 0.20 ~ 0.30%, Cu≤0.05%, Al 0.020 ~ 0.050%, V≤0.07%, Nb≤0.04%, Nb+V≤0.07%, surplus is Fe and inevitable impurity.
(2) casting operation: the molten steel after smelting is poured into a mould, obtains steel ingot; Utilize flame cleaning, clean out the defect such as crackle, subsurface bubble that surface of steel ingot may exist.
(3) heating process: soaking pit heating maximum heating temperature 1280 DEG C, soaking temperature 1240 DEG C ~ 1260 DEG C, does not allow certain section of burning to chew complete shut-down in heat-processed.
(4) rolling process: adopt recrystallization zone+Unhydrated cement two-phase control rolling technique to be rolled; First stage start rolling temperature is 1050 DEG C ~ 1100 DEG C, and this stage single pass draught is 15% ~ 25%, and accumulative draft is 35% ~ 50%, and warm-rolling system of robbing increases draught as far as possible; Subordinate phase rolling temperature≤890 DEG C, the steel thickness that dries in the air is 1.5 times of steel plate thickness, and accumulative draft is that 30% ~ 55%, II stage single pass draft >=10% is no less than 3 passages, i.e. draft >=10% of at least 3 passages.
(5) roller repairing operation: steel plate rolls rear water-cooled, red temperature 690 DEG C ~ 710 DEG C; Roll off the production line the steel plate after rolling stacking slow cooling in time, surface of steel plate temperature >=450 DEG C, stacking total time >=72h; Steel plate after thermal treatment is carried out UT (Ultrasonic Testing) inspection according to ASME SA578/SA578M one by one, and qualified rank is B level.
(6) heat treatment step:
A, quench treatment: quench to the qualified steel plate of flaw detection, quenching temperature 910 ± 10 DEG C, soaking time PLC+20min, utilize maximum amount of water to carry out water-cooled accelerating cooling after quenching;
B, temper: carry out tempering to the steel plate after quench treatment, tempering temperature 640 ~ 650 DEG C, soaking time 3 ~ 4min/mm, can obtain described heavy thickness SA738GrA steel plate after tempering.
Embodiment 1: the concrete production technique of this heavy thickness SA738GrA steel plate is as described below.
This steel plate thickness is 112mm, is grouped into by the one-tenth of following weight percent: C 0.14%, Si 0.34%, Mn 1.44%, P 0.007%, S 0.003%, Cr 0.18%, Mo 0.02%, Ti 0.002%, Ni 0.26%, Cu 0.03%, Al 0.038%, V 0.002%, Nb 0.025%, all the other are Fe and inevitable impurity.
The step of this Plate Production method is as follows:
(1) smelting procedure: molten steel is first sent into the refining of LF stove and adjusting component after electrosmelting, proceed to vacuum degassing furnace (VD stove) afterwards and carry out vacuum-treat, before vacuum-treat, Ca-Si block 165kg, below vacuum tightness 66Pa keep destroying vacuum in 20 minutes, and soft blow is bull ladle after 5 minutes.
(2) casting operation: cast by the molten steel after smelting, adopts die casting to produce, obtains steel ingot.
(3) heating process: soaking pit maximum heating temperature 1280 DEG C, soaking temperature 1260 DEG C.
(4) rolling process: first stage, start rolling temperature is 1100 DEG C, finishing temperature 950 DEG C, and single pass draught is 15% ~ 20%, and accumulative draft is 45%, and being rolling to steel plate thickness is 180mm; Subordinate phase, start rolling temperature 890 DEG C, finishing temperature 850 DEG C, is rolling to target thickness, single pass draft be greater than 10% be 5 passages, the steel thickness that dries in the air is 1.5 times of steel plate thickness, and accumulative draft is 35%, obtains work in-process steel plate after rolling.
(5) roller repairing operation: work in-process steel plate water-cooled, red temperature 700 DEG C; The stacking that rolls off the production line in time cools, surface of steel plate temperature 480 DEG C, 72 hours stacking total times.
(6) heat treatment step: in quench treatment process, quenching temperature 910 DEG C, soaking time PLC+20min, utilize maximum amount of water to carry out water-cooled accelerating cooling after quenching; In temper process, tempering temperature 645 DEG C, soaking time 3.5min/mm, after tempering, air cooling obtains finished steel plate.
The mechanical property of this steel plate: yield strength 520MPa, tensile strength 613MPa, unit elongation 28% ,-46 DEG C of ballistic works average 192 are burnt.
Embodiment 2: the concrete production technique of this heavy thickness SA738GrA steel plate is as described below.
This steel plate thickness is 112mm, is grouped into by the one-tenth of following weight percent: C 0.16%, Si 0.32%, Mn 1.43%, P 0.006%, S 0.002%, Cr 0.20%, Mo 0.04%, Ti 0.001%, Ni 0.30%, Cu 0.02%, Al 0.037%, V 0.002%, Nb 0.023%, all the other are Fe and inevitable impurity.
The step of this Plate Production method is as follows: (1) smelting procedure: molten steel is first sent into the refining of LF stove and adjusting component after electrosmelting, proceed to vacuum degassing furnace (VD stove) afterwards and carry out vacuum-treat, Ca-Si block 165kg before vacuum-treat, below vacuum tightness 66Pa keeps destroying vacuum in 25 minutes, and soft blow is bull ladle after 5 minutes.
(2) casting operation: cast by the molten steel after smelting, adopts die casting to produce, obtains steel ingot.
(3) heating process: the maximum heating temperature of soaking pit 1280 DEG C, soaking temperature 1250 DEG C.
(4) rolling process: first stage, start rolling temperature is 1050 DEG C, finishing temperature 940 DEG C, and single pass draught is 20% ~ 25%, and accumulative draft is 50%, and being rolling to steel plate thickness is 179mm; Subordinate phase, start rolling temperature 880 DEG C, finishing temperature 840 DEG C, is rolling to target thickness, single pass draft >=10% be 6 passages, the steel thickness that dries in the air is 1.5 times of steel plate thickness, and accumulative draft is 40%, obtains work in-process steel plate after rolling.
(5) roller repairing operation: work in-process steel plate water-cooled, red temperature 700 DEG C; The stacking that rolls off the production line in time cools, surface of steel plate temperature 480 DEG C, 75 hours stacking total times.
(6) heat treatment step: in quench treatment process, quenching temperature 915 DEG C, soaking time PLC+20min, utilize maximum amount of water to carry out water-cooled accelerating cooling after quenching; In temper process, tempering temperature 650 DEG C, soaking time 4min/mm, after tempering, air cooling obtains finished steel plate.
The mechanical property of this steel plate: yield strength 517MPa, tensile strength 608MPa, unit elongation 28.5% ,-46 DEG C of ballistic works average 191 are burnt.
Embodiment 3: the concrete production technique of this heavy thickness SA738GrA steel plate is as described below.
This steel plate is grouped into by the one-tenth of following weight percent: C 0.15%, Si 0.25%, Mn 1.40%, P 0.020%, S 0.007%, Cr 0.15%, Mo 0.05%, Ti 0.02%, Ni 0.23%, Cu 0.05%, Al 0.020%, V 0.02%, Nb 0.04%, all the other are Fe and inevitable impurity.
The step of this Plate Production method is as follows: (1) smelting procedure: molten steel is first sent into the refining of LF stove and adjusting component after electrosmelting, proceeds to vacuum degassing furnace (VD stove) afterwards and carry out vacuum-treat.
(2) casting operation: cast by the molten steel after smelting, adopts die casting to produce, obtains steel ingot.
(3) heating process: the maximum heating temperature of soaking pit 1280 DEG C, soaking temperature 1240 DEG C.
(4) rolling process: first stage, start rolling temperature is 1100 DEG C, and single pass draught is 15% ~ 20%, and accumulative draft is 40%; Subordinate phase, start rolling temperature 850 DEG C, finishing temperature 820 DEG C, is rolling to target thickness, single pass draft be greater than 10% be 3 passages, the steel thickness that dries in the air is 1.5 times of steel plate thickness, and accumulative draft is 30%, obtains 112mm work in-process steel plate after rolling.
(5) roller repairing operation: work in-process steel plate water-cooled, red temperature 690 DEG C; The stacking that rolls off the production line in time cools, surface of steel plate temperature 450 DEG C, 80 hours stacking total times.
(6) heat treatment step: in quench treatment process, quenching temperature 920 DEG C, soaking time PLC+20min, utilize maximum amount of water to carry out water-cooled accelerating cooling after quenching; In temper process, tempering temperature 640 DEG C, soaking time 3.2min/mm, after tempering, air cooling obtains finished steel plate.
The mechanical property of this steel plate: yield strength 518MPa, tensile strength 610MPa, unit elongation 28.2% ,-46 DEG C of ballistic works average 191.5 are burnt.
Test example: carry out batch producing according to the composition proportion of embodiment 3 and preparation technology, gained each batch of steel plate tensile property and impact property refer to table 1, table 2 respectively.
Table 1: the tensile property of this SA738GrA steel plate
Table 2: the low temperature impact properties of this SA738GrA steel plate
Embodiment 4: the concrete production technique of this heavy thickness SA738GrA steel plate is as described below.
This steel plate is grouped into by the one-tenth of following weight percent: C 0.15%, Si 0.45%, Mn 1.35%, P 0.012%, S 0.010%, Cr 0.16%, Mo 0.06%, Ti 0.01%, Ni 0.20%, Cu 0.03%, Al 0.050%, V 0.07%, all the other are Fe and inevitable impurity.
The step of this Plate Production method is as follows: (1) smelting procedure: molten steel is first sent into the refining of LF stove and adjusting component after electrosmelting, proceeds to vacuum degassing furnace (VD stove) afterwards and carry out vacuum-treat.
(2) casting operation: cast by the molten steel after smelting, adopts die casting to produce, obtains steel ingot.
(3) heating process: the maximum heating temperature of soaking pit 1280 DEG C, soaking temperature 1245 DEG C.
(4) rolling process: first stage, start rolling temperature is 1080 DEG C, and single pass draught is 16% ~ 18%, and accumulative draft is 42%; Subordinate phase, start rolling temperature 860 DEG C, finishing temperature 820 DEG C, is rolling to target thickness, single pass draft >=10% be 5 passages, the steel thickness that dries in the air is 1.5 times of steel plate thickness, and accumulative draft is 55%, obtains 112mm work in-process steel plate after rolling.
(5) roller repairing operation: work in-process steel plate water-cooled, red temperature 710 DEG C; The stacking that rolls off the production line in time cools, surface of steel plate temperature 500 DEG C, 78 hours stacking total times.
(6) heat treatment step: in quench treatment process, quenching temperature 900 DEG C, soaking time PLC+20min, utilize maximum amount of water to carry out water-cooled accelerating cooling after quenching; In temper process, tempering temperature 645 DEG C, soaking time 3.7min/mm, after tempering, air cooling obtains finished steel plate.
The mechanical property of this steel plate: yield strength 519MPa, tensile strength 611MPa, unit elongation 28.1% ,-46 DEG C of ballistic works average 190.5 are burnt.
Test example: carry out batch producing according to the composition proportion of embodiment 4 and preparation technology, gained each batch of steel plate tensile property and impact property refer to table 3, table 4 respectively.
Table 3: the tensile property of this SA738GrA steel plate
Table 4: the low temperature impact properties of this SA738GrA steel plate
Embodiment 5: the concrete production technique of this heavy thickness SA738GrA steel plate is as described below.
This steel plate thickness 112mm, is grouped into by the one-tenth of following weight percent: C 0.15%, Si 0.33%, Mn 1.45%, P 0.006%, S 0.002%, Cr 0.17%, Mo 0.03%, Ti 0.003%, Ni 0.25%, Cu 0.03%, Al 0.035%, V 0.003%, Nb 0.020%, all the other are Fe and inevitable impurity.
The step of this Plate Production method is as follows: (1) smelting procedure: molten steel is first sent into the refining of LF stove and adjusting component after electrosmelting, proceed to vacuum degassing furnace (VD stove) afterwards and carry out vacuum-treat, Ca-Si block 165kg before vacuum-treat, below vacuum tightness 66Pa keeps destroying vacuum in 22 minutes, and soft blow is bull ladle after 5 minutes.
(2) casting operation: cast by the molten steel after smelting, adopts die casting to produce, obtains steel ingot.
(3) heating process: the maximum heating temperature of soaking pit 1280 DEG C, soaking temperature 1255 DEG C.
(4) rolling process: first stage, start rolling temperature is 1070 DEG C, finishing temperature 940 DEG C, and single pass draught is 15% ~ 18%, and accumulative draft is 35%, and being rolling to steel plate thickness is 180.5mm; Subordinate phase, start rolling temperature 880 DEG C, finishing temperature 845 DEG C, is rolling to target thickness, single pass draft be greater than 10% be 4 passages, the steel thickness that dries in the air is 1.5 times of steel plate thickness, and accumulative draft is 45%, obtains work in-process steel plate after rolling.
(5) roller repairing operation: work in-process steel plate water-cooled, red temperature 700 DEG C; The stacking that rolls off the production line in time cools, surface of steel plate temperature 480 DEG C, 73 hours stacking total times.
(6) heat treatment step: in quench treatment process, quenching temperature 914 DEG C, soaking time PLC+20min, utilize maximum amount of water to carry out water-cooled accelerating cooling after quenching; In temper process, tempering temperature 648 DEG C, soaking time 3min/mm, after tempering, air cooling obtains finished steel plate.
The mechanical property of this steel plate: yield strength 516MPa, tensile strength 601MPa, unit elongation 29% ,-46 DEG C of ballistic works average 190 are burnt.
Test example: carry out batch producing according to the composition proportion of embodiment 5 and preparation technology, gained each batch of steel plate tensile property and impact property refer to table 5, table 6 respectively.
Table 5: the tensile property of this SA738GrA steel plate
Table 6: the low temperature impact properties of this SA738GrA steel plate
By above-mentioned test example, and table 1 is known to table 6, and this steel plate also has excellent low-temperature impact toughness concurrently while having good tensile property; Present method adopts quenching+tempering technique, and whole mechanical property of steel plate is outstanding, steady quality, is applicable to the production in enormous quantities of the heavy thickness SA738GrA steel plate having particular requirement.
Claims (6)
1. a heavy thickness SA738GrA steel plate, is characterized in that, it is grouped into by the one-tenth of following weight percent: C 0.14 ~ 0.16%, Si 0.25 ~ 0.45%, Mn 1.35 ~ 1.45%, P≤0.020%, S≤0.010%, Cr 0.15 ~ 0.20%, Mo≤0.06%, Ti≤0.02%, Ni 0.20 ~ 0.30%, Cu≤0.05%, Al 0.020 ~ 0.050%, V≤0.07%, Nb≤0.04%, Nb+V≤0.07%, surplus is Fe and inevitable impurity.
2. heavy thickness SA738GrA steel plate according to claim 1, is characterized in that: described steel plate thickness is 112mm.
3. the production method of a heavy thickness SA738GrA steel plate, it comprises smelting, casting, heating, rolling, roller repairing and heat treatment step, it is characterized in that: the weight percentage of described smelting procedure tapping molten steel composition is: C 0.14 ~ 0.16%, Si 0.25 ~ 0.45%, Mn 1.35 ~ 1.45%, P≤0.020%, S≤0.010%, Cr 0.15 ~ 0.20%, Mo≤0.06%, Ti≤0.02%, Ni 0.20 ~ 0.30%, Cu≤0.05%, Al 0.020 ~ 0.050%, V≤0.07%, Nb≤0.04%, Nb+V≤0.07%, surplus is Fe and inevitable impurity.
4. the production method of heavy thickness SA738GrA steel plate according to claim 3, is characterized in that, described heating process: soaking pit heating maximum heating temperature 1280 DEG C, soaking temperature 1240 DEG C ~ 1260 DEG C;
The production method of heavy thickness SA738GrA steel plate according to claim 3, is characterized in that, described rolling process: adopt two-phase control rolling technique; First stage start rolling temperature is 1050 DEG C ~ 1100 DEG C, and this stage single pass draught is 15% ~ 25%, and accumulative draft is 35% ~ 50%; Subordinate phase rolling temperature≤890 DEG C, the steel thickness that dries in the air is 1.5 times of steel plate thickness, and accumulative draft is 30% ~ 55%, and single pass draft >=10% is no less than 3 passages.
5. the production method of heavy thickness SA738GrA steel plate according to claim 3, is characterized in that, described roller repairing operation: steel plate rolls rear water-cooled, red temperature 690 DEG C ~ 710 DEG C; Then the stacking that rolls off the production line cool, surface of steel plate temperature >=450 DEG C, stacking total time >=72h.
6. the production method of the heavy thickness SA738GrA steel plate according to claim 3,4 or 5, is characterized in that, heat treatment step: quenching+tempering process; During quench treatment, quenching temperature 910 ± 10 DEG C, soaking time PLC+20min, utilize maximum amount of water to carry out water-cooled accelerating cooling after quenching; During temper, tempering temperature 640 ~ 650 DEG C, soaking time 3 ~ 4min/mm, can obtain described heavy thickness SA738GrA steel plate after tempering.
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