CN104711480B - Dedicated wear-resisting anticorrosion steel plate for storage rack platform and preparation method of steel plate - Google Patents
Dedicated wear-resisting anticorrosion steel plate for storage rack platform and preparation method of steel plate Download PDFInfo
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Abstract
The invention discloses a dedicated wear-resisting anticorrosion steel plate for a storage rack platform and a preparation method of the steel plate. The steel plate comprises the following components by mass percent: 0.28-0.31% of C, 0.45-0.47% of Mn, 0.09-0.12% of Si, 0.006-0.008% of P, S less than or equal to 0.004%, 0.07-0.09% of V, 0.08-0.12% of Ti, 0.10-0.13% of Al, N less than or equal to 0.006%, 0.012-0.015% of Cu, 0.4-0.6% of Cr, 0.33-0.36% of Mo, 0.015-0.032% of rare earth trace elements, and the balance of Fe and unavoidable impurities; the rare earth trace elements comprise the following chemical components in mass percent: 8-12% of Nd, 11-16% of Ce, 3-5% of Er, 2-6% of Pr, 1-4% of Pm, 0-5% of Dy, and the balance of La. The preparation method of the steel plate disclosed by the invention can be used for achieving a reasonable two-phase ratio, small ferrites and dispersed pearlites, avoids banded structures, and further improves the acid resistance due to lack of the banded structures.
Description
Technical field
The present invention relates to a kind of steel plate and preparation method thereof, specifically a kind of shelf platform-specific Wear-resistant corrosion-resistant steel
Plate and preparation method thereof.
Background technology
Shelf platform is to build a steel platform and pallets and platforms in the steel construction of one at heavy weight shelving top, for
Special material deposit needs, the use condition of shelf and environment are more and more harsher, more and more thicker to the thickness requirement of steel plate, phase
The technical requirements of the steel plate for storage facilities also should be improved constantly ground.Especially for depositing some corrosive cargos
When, usually can the column of humus body panel and loading steel plate, lead to storage facilities just to damage at short notice, increased storage
Cost.The Wear-resistant corrosion-resistant performance therefore how effectively improving shelf steel is the skill that those skilled in the art have always a demand for solving
Art problem.
Content of the invention
The technical problem to be solved is, the shortcoming overcoming prior art, provides a kind of shelf platform-specific resistance to
Mill anticorrosion steel plate and preparation method thereof, makes the steel plate produced have good wearability and corrosion resistance.
The technical scheme that the present invention solves above technical problem is: provides a kind of shelf platform-specific Wear-resistant corrosion-resistant steel
Plate, the composition of this steel plate and mass percent are: c:0.28-0.31%, mn:0.45-0.47%, si:0.09-0.12%, p:
0.006-0.008%, s≤0.004%, v:0.07-0.09%, ti:0.08-0.12%, al:0.10-0.13%, n≤
0.006%th, cu:0.012-0.015%, cr:0.4-0.6%, mo:0.33-0.36%, rare earth microelement: 0.015-
0.032%, balance of fe and inevitable impurity；
The chemical composition weight/mass percentage composition of described rare earth microelement is: nd:8-12%, ce:11-16%, er:3-
5%, pr:2-6%, pm:1-4%, dy:0-5%, balance of la；
In this steel plate, first is mutually ferrite, and second is mutually pearlite, the second phase volume percentage at surface to 1/4 thickness
Number is 2.7-2.9%, and 1/4 thickness to center the second phase volume percent is 7.0-7.5%, and no banded structure；
This steel plate ferrite average crystal grain diameter at surface to 1/4 thickness is 3.2-3.4 μm, pearlite colony average diameter
For 5.2-5.6 μm, 1/4 thickness to center ferrite average crystal grain diameter is 4.8-5.1 μm, and pearlite colony average diameter is
7.0-7.3μm.
The technical scheme that the present invention limits further is: aforesaid shelf platform-specific Wear-resistant corrosion-resistant steel plate, this steel plate
Composition and mass percent be: c:0.28%, mn:0.45%, si:0.09%, p:0.006%, s≤0.004%, v:
0.07%th, ti:0.08-0.12%, al:0.10%, n≤0.006%, cu:0.012%, cr:0.4%, mo:0.33%, rare earth
Trace element: 0.015%, balance of fe and inevitable impurity；
The chemical composition weight/mass percentage composition of described rare earth microelement is: nd:8%, ce:11%, er:3%, pr:
2%, pm:1%, balance of la；
In this steel plate, first is mutually ferrite, and second is mutually pearlite, the second phase volume percentage at surface to 1/4 thickness
Number is 2.7%, and 1/4 thickness to center the second phase volume percent is 7.0%, and no banded structure；
This steel plate ferrite average crystal grain diameter at surface to 1/4 thickness is 3.2 μm, and pearlite colony average diameter is
5.2 μm, 1/4 thickness to center ferrite average crystal grain diameter is 4.8 μm, and pearlite colony average diameter is 7.0 μm.
Aforesaid shelf platform-specific Wear-resistant corrosion-resistant steel plate, the composition of this steel plate and mass percent are: c:0.29%,
Mn:0.46%, si:0.10%, p:0.007%, s≤0.004%, v:0.08%, ti:0.10%, al:0.11%, n≤
0.006%th, cu:0.013%, cr:0.5%, mo:0.35%, rare earth microelement: 0.022%, balance of fe and inevitable
Impurity；
The chemical composition weight/mass percentage composition of described rare earth microelement is: nd:10%, ce:15%, er:4%, pr:
4%, pm:2%, dy:3%, balance of la；
In this steel plate, first is mutually ferrite, and second is mutually pearlite, the second phase volume percentage at surface to 1/4 thickness
Number is 2.8%, and 1/4 thickness to center the second phase volume percent is 7.4%, and no banded structure；
This steel plate ferrite average crystal grain diameter at surface to 1/4 thickness is 3.3 μm, and pearlite colony average diameter is
5.4 μm, 1/4 thickness to center ferrite average crystal grain diameter is 5.0 μm, and pearlite colony average diameter is 7.1 μm.
Aforesaid shelf platform-specific Wear-resistant corrosion-resistant steel plate, the composition of this steel plate and mass percent are: c:0.31%,
Mn:0.47%, si:0.12%, p:0.008%, s≤0.004%, v:0.09%, ti:0.12%, al:0.13%, n≤
0.006%th, cu:0.015%, cr:0.6%, mo:0.36%, rare earth microelement: 0.032%, balance of fe and inevitable
Impurity；
The chemical composition weight/mass percentage composition of described rare earth microelement is: nd:12%, ce:16%, er:5%, pr:
6%, pm:4%, dy:5%, balance of la；
In this steel plate, first is mutually ferrite, and second is mutually pearlite, the second phase volume percentage at surface to 1/4 thickness
Number is 2.9%, and 1/4 thickness to center the second phase volume percent is 7.5%, and no banded structure；
This steel plate ferrite average crystal grain diameter at surface to 1/4 thickness is 3.4 μm, and pearlite colony average diameter is
5.6 μm, 1/4 thickness to center ferrite average crystal grain diameter is 5.1 μm, and pearlite colony average diameter is 7.3 μm.
A kind of preparation method of shelf platform-specific Wear-resistant corrosion-resistant steel plate, comprises the steps of
(i) molten iron pretreatment:
Using mg powder or mg powder+cao, Sulfur Content in Hot Iron content is dropped to less than 0.005%, the pretreated temperature of molten iron:
1150-1170℃；
(ii) top and bottom combined blown converter smelting；
Terminal Composition Control requires: p≤0.008%, n≤0.006%；Outlet temperature controls at 1560-1580 DEG C, adds
Rare earth microelement；Ladle temperature control is at 1610-1630 DEG C；The whole atm number of tapping process stirs, and tolerance is 450-750l/
Min, has gone out little tolerance stirring after steel, tolerance is 10-50l/min；
(iii) lf stove refine:
Electrode submerged arc and micro-pressure operation, prevent nitrogen pick-up and carburetting；Using high-power power supply, power is 8000w-9000w,
Conduction time controls in 10-12min, and lf puts into ca after processing；
(iv) rh Fruit storage:
Rh condition of high vacuum degree≤5.0mbar, retention time 20-22min；Vacuum carries out Calcium treatment to molten steel, at calcium after terminating
After reason, molten steel is carried out with quiet stir process, soft blow time 15-17min；
(v) continuous casting:
Stability contorting pulling rate, liquid level fluctuation of crystallizer controls within ± 3mm, and the middle bag degree of superheat controls within 20 DEG C；
(vi) slab prepares steel plate through thermomechanical controlled rolling and controlled cooling technique:
Roughing finishing temperature is 1150-1170 DEG C, and entrance finishing temperature is 730-750 DEG C, and finishing temperature is 670-690
DEG C, adopt the air-cooled cooldown rate with 2-4 DEG C/s that slab is cooled to 550-570 DEG C after hot rolling, then adopt water-cooled with 4-6 DEG C/s's
Slab water-cooled to 370-390 DEG C, is adopted compressed air or vaporific quenching liquid with the cooldown rate of 7-9 DEG C/s by plate by cooldown rate
Base is cooled to room temperature, thus obtaining the pearlite of fine ferrite and Dispersed precipitate, and no banded structure；
(vii) the thermally treated technique of steel plate prepares shelf platform-specific Wear-resistant corrosion-resistant steel plate:
Steel plate is heated to 1250-1270 DEG C by tempering furnace tempering, is cooled fast to by compressed air after coming out of the stove
950-770 DEG C, through the first refrigerating work procedure, steel plate fast speed is cooled to 570-590 DEG C online, colder by the second cooling technique
But arrive room temperature；
Described first refrigerating work procedure: adopt compressed air or vaporific quenching liquid with the cooldown rate of 15-17 DEG C/s by steel plate
It is cooled to 570-590 DEG C；
Described second refrigerating work procedure: be combined with air cooling using water-cooled, first adopt water-cooled with the cooldown rate of 7-9 DEG C/s by steel
Plate water-cooled, to 420-450 DEG C, is then air cooled to 350-370 DEG C, then adopts water-cooled with the cooldown rate of 4-6 DEG C/s by steel plate water-cooled
To room temperature；
By thermomechanical controlled rolling and controlled cooling technique above and be thermally treated resulting in reasonable two fine ferrite compared
And pearlite, at surface to 1/4 thickness, the second phase volume percent is 2.7-2.9%, and 1/4 thickness is to center second phase volume
Percent is 7.0-7.5%, and no banded structure.
The preparation method of aforesaid shelf platform-specific Wear-resistant corrosion-resistant steel plate, comprises the steps of
(i) molten iron pretreatment:
Using mg powder or mg powder+cao, Sulfur Content in Hot Iron content is dropped to less than 0.005%, the pretreated temperature of molten iron:
1150℃；
(ii) top and bottom combined blown converter smelting；
Terminal Composition Control requires: p≤0.008%, n≤0.006%；Outlet temperature controls at 1560 DEG C, adds rare earth
Trace element；Ladle temperature control is at 1610 DEG C；The whole atm number of tapping process stirs, and tolerance is 450l/min, after having gone out steel
Little tolerance stirring, tolerance is 10-50l/min；
(iii) lf stove refine:
Electrode submerged arc and micro-pressure operation, prevent nitrogen pick-up and carburetting；Using high-power power supply, power is 8000w, during energising
Between control in 10min, lf process after put into ca；
(iv) rh Fruit storage:
Rh condition of high vacuum degree≤5.0mbar, retention time 20min；Vacuum carries out Calcium treatment to molten steel, after Calcium treatment after terminating
Molten steel is carried out with quiet stir process, soft blow time 15min；
(v) continuous casting:
Stability contorting pulling rate, liquid level fluctuation of crystallizer controls within ± 3mm, and the middle bag degree of superheat controls within 20 DEG C；
(vi) slab prepares steel plate through thermomechanical controlled rolling and controlled cooling technique:
Roughing finishing temperature is 1150 DEG C, and entrance finishing temperature is 730 DEG C, and finishing temperature is 670 DEG C, adopts wind after hot rolling
Slab is cooled to 550 DEG C by the cold cooldown rate with 2 DEG C/s, then adopts water-cooled with the cooldown rate of 4 DEG C/s by slab water-cooled to 370
DEG C, adopt compressed air or vaporific quenching liquid with the cooldown rate of 7 DEG C/s, slab to be cooled to room temperature, thus obtaining fine ferrite
With the pearlite of Dispersed precipitate, and no banded structure；
(vii) the thermally treated technique of steel plate prepares shelf platform-specific Wear-resistant corrosion-resistant steel plate:
Steel plate is heated to 1250 DEG C by tempering furnace tempering, after coming out of the stove, is cooled fast to 950 DEG C by compressed air,
Steel plate fast speed is cooled to 570 DEG C through the first refrigerating work procedure by line, then is cooled to room temperature by the second cooling technique；
Described first refrigerating work procedure: adopt compressed air or vaporific quenching liquid to be cooled to steel plate with the cooldown rate of 15 DEG C/s
570℃；
Described second refrigerating work procedure: be combined with air cooling using water-cooled, first adopt water-cooled with the cooldown rate of 7 DEG C/s by steel plate
Water-cooled, to 420 DEG C, is then air cooled to 350 DEG C, then adopt water-cooled with the cooldown rate of 4 DEG C/s by steel plate water-cooled to room temperature.
The preparation method of aforesaid shelf platform-specific Wear-resistant corrosion-resistant steel plate, comprises the steps of
(i) molten iron pretreatment:
Using mg powder or mg powder+cao, Sulfur Content in Hot Iron content is dropped to less than 0.005%, the pretreated temperature of molten iron:
1160℃；
(ii) top and bottom combined blown converter smelting；
Terminal Composition Control requires: p≤0.008%, n≤0.006%；Outlet temperature controls at 1570 DEG C, adds rare earth
Trace element；Ladle temperature control is at 1620 DEG C；The whole atm number of tapping process stirs, and tolerance is 550l/min, after having gone out steel
Little tolerance stirring, tolerance is 35l/min；
(iii) lf stove refine:
Electrode submerged arc and micro-pressure operation, prevent nitrogen pick-up and carburetting；Using high-power power supply, power is 8500w, during energising
Between control in 11min, lf process after put into ca；
(iv) rh Fruit storage:
Rh condition of high vacuum degree≤5.0mbar, retention time 21min；Vacuum carries out Calcium treatment to molten steel, after Calcium treatment after terminating
Molten steel is carried out with quiet stir process, soft blow time 16min；
(v) continuous casting:
Stability contorting pulling rate, liquid level fluctuation of crystallizer controls within ± 3mm, and the middle bag degree of superheat controls within 20 DEG C；
(vi) slab prepares steel plate through thermomechanical controlled rolling and controlled cooling technique:
Roughing finishing temperature is 1160 DEG C, and entrance finishing temperature is 740 DEG C, and finishing temperature is 680 DEG C, adopts wind after hot rolling
Slab is cooled to 560 DEG C by the cold cooldown rate with 3 DEG C/s, then adopts water-cooled with the cooldown rate of 5 DEG C/s by slab water-cooled to 380
DEG C, adopt compressed air or vaporific quenching liquid with the cooldown rate of 8 DEG C/s, slab to be cooled to room temperature, thus obtaining fine ferrite
With the pearlite of Dispersed precipitate, and no banded structure；
(vii) the thermally treated technique of steel plate prepares shelf platform-specific Wear-resistant corrosion-resistant steel plate:
Steel plate is heated to 1260 DEG C by tempering furnace tempering, after coming out of the stove, is cooled fast to 960 DEG C by compressed air,
Steel plate fast speed is cooled to 580 DEG C through the first refrigerating work procedure by line, then is cooled to room temperature by the second cooling technique；
Described first refrigerating work procedure: adopt compressed air or vaporific quenching liquid to be cooled to steel plate with the cooldown rate of 16 DEG C/s
580℃；
Described second refrigerating work procedure: be combined with air cooling using water-cooled, first adopt water-cooled with the cooldown rate of 8 DEG C/s by steel plate
Water-cooled, to 430 DEG C, is then air cooled to 360 DEG C, then adopt water-cooled with the cooldown rate of 5 DEG C/s by steel plate water-cooled to room temperature.
Further, the preparation method of aforesaid shelf platform-specific Wear-resistant corrosion-resistant steel plate, comprises the steps of
(i) molten iron pretreatment:
Using mg powder or mg powder+cao, Sulfur Content in Hot Iron content is dropped to less than 0.005%, the pretreated temperature of molten iron:
1150-1170℃；
(ii) top and bottom combined blown converter smelting；
Terminal Composition Control requires: p≤0.008%, n≤0.006%；Outlet temperature controls at 1580 DEG C, adds rare earth
Trace element；Ladle temperature control is at 1630 DEG C；The whole atm number of tapping process stirs, and tolerance is 750l/min, after having gone out steel
Little tolerance stirring, tolerance is 50l/min；
(iii) lf stove refine:
Electrode submerged arc and micro-pressure operation, prevent nitrogen pick-up and carburetting；Using high-power power supply, power is 9000w, during energising
Between control in 12min, lf process after put into ca；
(iv) rh Fruit storage:
Rh condition of high vacuum degree≤5.0mbar, retention time 22min；Vacuum carries out Calcium treatment to molten steel, after Calcium treatment after terminating
Molten steel is carried out with quiet stir process, soft blow time 17min；
(v) continuous casting:
Stability contorting pulling rate, liquid level fluctuation of crystallizer controls within ± 3mm, and the middle bag degree of superheat controls within 20 DEG C；
(vi) slab prepares steel plate through thermomechanical controlled rolling and controlled cooling technique:
Roughing finishing temperature is 1170 DEG C, and entrance finishing temperature is 750 DEG C, and finishing temperature is 690 DEG C, adopts wind after hot rolling
Slab is cooled to 570 DEG C by the cold cooldown rate with 4 DEG C/s, then adopts water-cooled with the cooldown rate of 6 DEG C/s by slab water-cooled to 390
DEG C, adopt compressed air or vaporific quenching liquid with the cooldown rate of 9 DEG C/s, slab to be cooled to room temperature, thus obtaining fine ferrite
With the pearlite of Dispersed precipitate, and no banded structure；
(vii) the thermally treated technique of steel plate prepares shelf platform-specific Wear-resistant corrosion-resistant steel plate:
Steel plate is heated to 1270 DEG C by tempering furnace tempering, after coming out of the stove, is cooled fast to 770 DEG C by compressed air,
Steel plate fast speed is cooled to 590 DEG C through the first refrigerating work procedure by line, then is cooled to room temperature by the second cooling technique；
Described first refrigerating work procedure: adopt compressed air or vaporific quenching liquid to be cooled to steel plate with the cooldown rate of 17 DEG C/s
590℃；
Described second refrigerating work procedure: be combined with air cooling using water-cooled, first adopt water-cooled with the cooldown rate of 9 DEG C/s by steel plate
Water-cooled, to 450 DEG C, is then air cooled to 370 DEG C, then adopt water-cooled with the cooldown rate of 6 DEG C/s by steel plate water-cooled to room temperature.
The invention has the beneficial effects as follows:
The effect that in composition of steel of the present invention, al and nb, the control of v, ti, cu, cr and mo content are played is: steel plate of the present invention
Containing c, si, mn element, add al and nb, v, ti, cu, cr and mo can refined crystalline strengthening and precipitation strength, and with low cost；Add dilute
Native trace element, depth can reduce the content of oxygen and sulfur and reduces the illeffectss of the element such as phosphorus and low melting point；And by with reference to lf,
Rh, continuous casting process control Molten Steel Cleanliness, and using two-stage controlled rolling, acc control is cold and process of thermal treatment can obtain ferrum
Ferritic adds pearlitic structrure, successfully produces the antiacid steel plate of normalizing, and steel plate has good obdurability and Antacid effectiveness.
The effect that the control of the present invention thermomechanical controlled rolling and controlled cooling technique and Technology for Heating Processing is played is: think gauge
Steel plate differs greatly in operation of rolling light plate Deformation in thickness amount, in cooling procedure along plate thickness rate of cooling difference relatively
Greatly, thus leading to the Ferrite Grain Size along thickness x cross sectional, volume fraction to change greatly, easily form banding in central area
Tissue；Because surface of steel plate deformation is higher than center portion, and cooling rate is higher than center portion, and Ferrite Grain Size is gradually increased to center by surface
Plus, pearlite volume fraction is gradually increased from surface to center portion；The present invention by thermomechanical controlled rolling and controlled cooling technique and
The control of Technology for Heating Processing, obtains the pearlite of reasonably biphase when fine ferrite and Dispersed precipitate, it is to avoid banded structure
Formation, no banded structure occur, improve Antacid effectiveness, thickness directional properties and low-temperature flexibility, thus reaching by microcosmic
Organizational controls effectively improve the purpose of steel plate Antacid effectiveness.
Specific embodiment
Below in conjunction with specific embodiment, technical scheme is described in further detail, but the protection model of the present invention
Enclose and be not limited thereto.
Embodiment 1
The present embodiment is a kind of shelf platform-specific Wear-resistant corrosion-resistant steel plate, and the composition of this steel plate and mass percent are:
C:0.28%, mn:0.45%, si:0.09%, p:0.006%, s≤0.004%, v:0.07%, ti:0.08-0.12%, al:
0.10%th, n≤0.006%, cu:0.012%, cr:0.4%, mo:0.33%, rare earth microelement: 0.015%, balance of fe
With inevitable impurity；
The chemical composition weight/mass percentage composition of described rare earth microelement is: nd:8%, ce:11%, er:3%, pr:
2%, pm:1%, balance of la；
In this steel plate, first is mutually ferrite, and second is mutually pearlite, the second phase volume percentage at surface to 1/4 thickness
Number is 2.7%, and 1/4 thickness to center the second phase volume percent is 7.0%, and no banded structure；This steel plate is on surface to 1/4
At thickness, ferrite average crystal grain diameter is 3.2 μm, and pearlite colony average diameter is 5.2 μm, and 1/4 thickness is to center ferrite
Average crystal grain diameter is 4.8 μm, and pearlite colony average diameter is 7.0 μm.
The preparation method of the shelf platform-specific Wear-resistant corrosion-resistant steel plate of the present embodiment, comprises the steps of
Comprise the steps of
(i) molten iron pretreatment:
Using mg powder or mg powder+cao, Sulfur Content in Hot Iron content is dropped to less than 0.005%, the pretreated temperature of molten iron:
1150℃；
(ii) top and bottom combined blown converter smelting；
Terminal Composition Control requires: p≤0.008%, n≤0.006%；Outlet temperature controls at 1560 DEG C, adds rare earth
Trace element；Ladle temperature control is at 1610 DEG C；The whole atm number of tapping process stirs, and tolerance is 450l/min, after having gone out steel
Little tolerance stirring, tolerance is 10-50l/min；
(iii) lf stove refine:
Electrode submerged arc and micro-pressure operation, prevent nitrogen pick-up and carburetting；Using high-power power supply, power is 8000w, during energising
Between control in 10min, lf process after put into ca；
(iv) rh Fruit storage:
Rh condition of high vacuum degree≤5.0mbar, retention time 20min；Vacuum carries out Calcium treatment to molten steel, after Calcium treatment after terminating
Molten steel is carried out with quiet stir process, soft blow time 15min；
(v) continuous casting:
Stability contorting pulling rate, liquid level fluctuation of crystallizer controls within ± 3mm, and the middle bag degree of superheat controls within 20 DEG C；
(vi) slab prepares steel plate through thermomechanical controlled rolling and controlled cooling technique:
Roughing finishing temperature is 1150 DEG C, and entrance finishing temperature is 730 DEG C, and finishing temperature is 670 DEG C, adopts wind after hot rolling
Slab is cooled to 550 DEG C by the cold cooldown rate with 2 DEG C/s, then adopts water-cooled with the cooldown rate of 4 DEG C/s by slab water-cooled to 370
DEG C, adopt compressed air or vaporific quenching liquid with the cooldown rate of 7 DEG C/s, slab to be cooled to room temperature, thus obtaining fine ferrite
With the pearlite of Dispersed precipitate, and no banded structure；
(vii) the thermally treated technique of steel plate prepares shelf platform-specific Wear-resistant corrosion-resistant steel plate:
Steel plate is heated to 1250 DEG C by tempering furnace tempering, after coming out of the stove, is cooled fast to 950 DEG C by compressed air,
Steel plate fast speed is cooled to 570 DEG C through the first refrigerating work procedure by line, then is cooled to room temperature by the second cooling technique；
Described first refrigerating work procedure: adopt compressed air or vaporific quenching liquid to be cooled to steel plate with the cooldown rate of 15 DEG C/s
570℃；
Described second refrigerating work procedure: be combined with air cooling using water-cooled, first adopt water-cooled with the cooldown rate of 7 DEG C/s by steel plate
Water-cooled, to 420 DEG C, is then air cooled to 350 DEG C, then adopt water-cooled with the cooldown rate of 4 DEG C/s by steel plate water-cooled to room temperature.
Embodiment 2
The shelf platform-specific Wear-resistant corrosion-resistant steel plate of the present embodiment, the composition of this steel plate and mass percent are: c:
0.29%th, mn:0.46%, si:0.10%, p:0.007%, s≤0.004%, v:0.08%, ti:0.10%, al:0.11%,
N≤0.006%, cu:0.013%, cr:0.5%, mo:0.35%, rare earth microelement: 0.022%, balance of fe and can not
The impurity avoiding；
The chemical composition weight/mass percentage composition of described rare earth microelement is: nd:10%, ce:15%, er:4%, pr:
4%, pm:2%, dy:3%, balance of la；
In this steel plate, first is mutually ferrite, and second is mutually pearlite, the second phase volume percentage at surface to 1/4 thickness
Number is 2.8%, and 1/4 thickness to center the second phase volume percent is 7.4%, and no banded structure；This steel plate is on surface to 1/4
At thickness, ferrite average crystal grain diameter is 3.3 μm, and pearlite colony average diameter is 5.4 μm, and 1/4 thickness is to center ferrite
Average crystal grain diameter is 5.0 μm, and pearlite colony average diameter is 7.1 μm.
The preparation method of the shelf platform-specific Wear-resistant corrosion-resistant steel plate of the present embodiment, comprises the steps of
(i) molten iron pretreatment:
Using mg powder or mg powder+cao, Sulfur Content in Hot Iron content is dropped to less than 0.005%, the pretreated temperature of molten iron:
1160℃；
(ii) top and bottom combined blown converter smelting；
Terminal Composition Control requires: p≤0.008%, n≤0.006%；Outlet temperature controls at 1570 DEG C, adds rare earth
Trace element；Ladle temperature control is at 1620 DEG C；The whole atm number of tapping process stirs, and tolerance is 550l/min, after having gone out steel
Little tolerance stirring, tolerance is 35l/min；
(iii) lf stove refine:
Electrode submerged arc and micro-pressure operation, prevent nitrogen pick-up and carburetting；Using high-power power supply, power is 8500w, during energising
Between control in 11min, lf process after put into ca；
(iv) rh Fruit storage:
Rh condition of high vacuum degree≤5.0mbar, retention time 21min；Vacuum carries out Calcium treatment to molten steel, after Calcium treatment after terminating
Molten steel is carried out with quiet stir process, soft blow time 16min；
(v) continuous casting:
Stability contorting pulling rate, liquid level fluctuation of crystallizer controls within ± 3mm, and the middle bag degree of superheat controls within 20 DEG C；
(vi) slab prepares steel plate through thermomechanical controlled rolling and controlled cooling technique:
Roughing finishing temperature is 1160 DEG C, and entrance finishing temperature is 740 DEG C, and finishing temperature is 680 DEG C, adopts wind after hot rolling
Slab is cooled to 560 DEG C by the cold cooldown rate with 3 DEG C/s, then adopts water-cooled with the cooldown rate of 5 DEG C/s by slab water-cooled to 380
DEG C, adopt compressed air or vaporific quenching liquid with the cooldown rate of 8 DEG C/s, slab to be cooled to room temperature, thus obtaining fine ferrite
With the pearlite of Dispersed precipitate, and no banded structure；
(vii) the thermally treated technique of steel plate prepares shelf platform-specific Wear-resistant corrosion-resistant steel plate:
Steel plate is heated to 1260 DEG C by tempering furnace tempering, after coming out of the stove, is cooled fast to 960 DEG C by compressed air,
Steel plate fast speed is cooled to 580 DEG C through the first refrigerating work procedure by line, then is cooled to room temperature by the second cooling technique；
Described first refrigerating work procedure: adopt compressed air or vaporific quenching liquid to be cooled to steel plate with the cooldown rate of 16 DEG C/s
580℃；
Described second refrigerating work procedure: be combined with air cooling using water-cooled, first adopt water-cooled with the cooldown rate of 8 DEG C/s by steel plate
Water-cooled, to 430 DEG C, is then air cooled to 360 DEG C, then adopt water-cooled with the cooldown rate of 5 DEG C/s by steel plate water-cooled to room temperature.
Embodiment 3
The shelf platform-specific Wear-resistant corrosion-resistant steel plate of the present embodiment, the composition of this steel plate and mass percent are: c:
0.31%th, mn:0.47%, si:0.12%, p:0.008%, s≤0.004%, v:0.09%, ti:0.12%, al:0.13%,
N≤0.006%, cu:0.015%, cr:0.6%, mo:0.36%, rare earth microelement: 0.032%, balance of fe and can not
The impurity avoiding；
The chemical composition weight/mass percentage composition of described rare earth microelement is: nd:12%, ce:16%, er:5%, pr:
6%, pm:4%, dy:5%, balance of la；
In this steel plate, first is mutually ferrite, and second is mutually pearlite, the second phase volume percentage at surface to 1/4 thickness
Number is 2.9%, and 1/4 thickness to center the second phase volume percent is 7.5%, and no banded structure；This steel plate is on surface to 1/4
At thickness, ferrite average crystal grain diameter is 3.4 μm, and pearlite colony average diameter is 5.6 μm, and 1/4 thickness is to center ferrite
Average crystal grain diameter is 5.1 μm, and pearlite colony average diameter is 7.3 μm.
The preparation method of the shelf platform-specific Wear-resistant corrosion-resistant steel plate of the present embodiment, comprises the steps of
(i) molten iron pretreatment:
Using mg powder or mg powder+cao, Sulfur Content in Hot Iron content is dropped to less than 0.005%, the pretreated temperature of molten iron:
1150-1170℃；
(ii) top and bottom combined blown converter smelting；
Terminal Composition Control requires: p≤0.008%, n≤0.006%；Outlet temperature controls at 1580 DEG C, adds rare earth
Trace element；Ladle temperature control is at 1630 DEG C；The whole atm number of tapping process stirs, and tolerance is 750l/min, after having gone out steel
Little tolerance stirring, tolerance is 50l/min；
(iii) lf stove refine:
Electrode submerged arc and micro-pressure operation, prevent nitrogen pick-up and carburetting；Using high-power power supply, power is 9000w, during energising
Between control in 12min, lf process after put into ca；
(iv) rh Fruit storage:
Rh condition of high vacuum degree≤5.0mbar, retention time 22min；Vacuum carries out Calcium treatment to molten steel, after Calcium treatment after terminating
Molten steel is carried out with quiet stir process, soft blow time 17min；
(v) continuous casting:
Stability contorting pulling rate, liquid level fluctuation of crystallizer controls within ± 3mm, and the middle bag degree of superheat controls within 20 DEG C；
(vi) slab prepares steel plate through thermomechanical controlled rolling and controlled cooling technique:
Roughing finishing temperature is 1170 DEG C, and entrance finishing temperature is 750 DEG C, and finishing temperature is 690 DEG C, adopts wind after hot rolling
Slab is cooled to 570 DEG C by the cold cooldown rate with 4 DEG C/s, then adopts water-cooled with the cooldown rate of 6 DEG C/s by slab water-cooled to 390
DEG C, adopt compressed air or vaporific quenching liquid with the cooldown rate of 9 DEG C/s, slab to be cooled to room temperature, thus obtaining fine ferrite
With the pearlite of Dispersed precipitate, and no banded structure；
(vii) the thermally treated technique of steel plate prepares shelf platform-specific Wear-resistant corrosion-resistant steel plate:
Steel plate is heated to 1270 DEG C by tempering furnace tempering, after coming out of the stove, is cooled fast to 770 DEG C by compressed air,
Steel plate fast speed is cooled to 590 DEG C through the first refrigerating work procedure by line, then is cooled to room temperature by the second cooling technique；
Described first refrigerating work procedure: adopt compressed air or vaporific quenching liquid to be cooled to steel plate with the cooldown rate of 17 DEG C/s
590℃；
Described second refrigerating work procedure: be combined with air cooling using water-cooled, first adopt water-cooled with the cooldown rate of 9 DEG C/s by steel plate
Water-cooled, to 450 DEG C, is then air cooled to 370 DEG C, then adopt water-cooled with the cooldown rate of 6 DEG C/s by steel plate water-cooled to room temperature.
The performance of each embodiment steel plate is as shown in table 1.
The performance of each embodiment steel plate of table 1
As seen from the above table, steel grade steel of the present invention is pure, have good intensity, plasticity and low-temperature flexibility, anti-hic performance and
Anti- ssc performance.
In addition to the implementation, the present invention can also have other embodiment.All employing equivalents or equivalent transformation shape
The technical scheme becoming, all falls within the protection domain of application claims.
Claims (8)
1. a kind of shelf platform-specific Wear-resistant corrosion-resistant steel plate it is characterised in that: the composition of this steel plate and mass percent are: c:
0.28-0.31%, mn:0.45-0.47%, si:0.09-0.12%, p:0.006-0.008%, s≤0.004%, v:0.07-0.09%,
Ti:0.08-0.12%, al:0.10-0.13%, n≤0.006%, cu:0.012-0.015%, cr:0.4-0.6%, mo:0.33-
0.36%th, rare earth microelement: 0.015-0.032%, balance of fe and inevitable impurity；
The chemical composition weight/mass percentage composition of described rare earth microelement is: nd:8-12%, ce:11-16%, er:3-5%, pr:2-
6%, pm:1-4%, dy:0-5%, balance of la；
In this steel plate, first is mutually ferrite, and second is mutually pearlite, and at surface to 1/4 thickness, the second phase volume percent is
2.7-2.9%, 1/4 thickness to center the second phase volume percent is 7.0-7.5%, and no banded structure；
This steel plate ferrite average crystal grain diameter at surface to 1/4 thickness is 3.2-3.4 μm, and pearlite colony average diameter is
5.2-5.6 μm, 1/4 thickness to center ferrite average crystal grain diameter is 4.8-5.1 μm, and pearlite colony average diameter is 7.0-
7.3μm.
2. shelf platform-specific Wear-resistant corrosion-resistant steel plate as claimed in claim 1 it is characterised in that: the composition of this steel plate and matter
Amount percentage ratio is: c:0.28%, mn:0.45%, si:0.09%, p:0.006%, s≤0.004%, v:0.07%, ti:0.08-
0.12%th, al:0.10%, n≤0.006%, cu:0.012%, cr:0.4%, mo:0.33%, rare earth microelement: 0.015%, surplus
For fe and inevitable impurity；
The chemical composition weight/mass percentage composition of described rare earth microelement is: nd:8%, ce:11%, er:3%, pr:2%, pm:1%,
Balance of la；
In this steel plate, first is mutually ferrite, and second is mutually pearlite, and at surface to 1/4 thickness, the second phase volume percent is
2.7%, 1/4 thickness to center the second phase volume percent is 7.0%, and no banded structure；
This steel plate ferrite average crystal grain diameter at surface to 1/4 thickness is 3.2 μm, and pearlite colony average diameter is 5.2 μm,
1/4 thickness is 4.8 μm to center ferrite average crystal grain diameter, and pearlite colony average diameter is 7.0 μm.
3. shelf platform-specific Wear-resistant corrosion-resistant steel plate as claimed in claim 1 it is characterised in that: the composition of this steel plate and matter
Amount percentage ratio is: c:0.29%, mn:0.46%, si:0.10%, p:0.007%, s≤0.004%, v:0.08%, ti:0.10%, al:
0.11%th, n≤0.006%, cu:0.013%, cr:0.5%, mo:0.35%, rare earth microelement: 0.022%, balance of fe and can not
The impurity avoiding；
The chemical composition weight/mass percentage composition of described rare earth microelement is: nd:10%, ce:15%, er:4%, pr:4%, pm:2%,
Dy:3%, balance of la；
In this steel plate, first is mutually ferrite, and second is mutually pearlite, and at surface to 1/4 thickness, the second phase volume percent is
2.8%, 1/4 thickness to center the second phase volume percent is 7.4%, and no banded structure；
This steel plate ferrite average crystal grain diameter at surface to 1/4 thickness is 3.3 μm, and pearlite colony average diameter is 5.4 μm,
1/4 thickness is 5.0 μm to center ferrite average crystal grain diameter, and pearlite colony average diameter is 7.1 μm.
4. shelf platform-specific Wear-resistant corrosion-resistant steel plate as claimed in claim 1 it is characterised in that: the composition of this steel plate and matter
Amount percentage ratio is: c:0.31%, mn:0.47%, si:0.12%, p:0.008%, s≤0.004%, v:0.09%, ti:0.12%, al:
0.13%th, n≤0.006%, cu:0.015%, cr:0.6%, mo:0.36%, rare earth microelement: 0.032%, balance of fe and can not
The impurity avoiding；
The chemical composition weight/mass percentage composition of described rare earth microelement is: nd:12%, ce:16%, er:5%, pr:6%, pm:4%,
Dy:5%, balance of la；
In this steel plate, first is mutually ferrite, and second is mutually pearlite, and at surface to 1/4 thickness, the second phase volume percent is
2.9%, 1/4 thickness to center the second phase volume percent is 7.5%, and no banded structure；
This steel plate ferrite average crystal grain diameter at surface to 1/4 thickness is 3.4 μm, and pearlite colony average diameter is 5.6 μm,
1/4 thickness is 5.1 μm to center ferrite average crystal grain diameter, and pearlite colony average diameter is 7.3 μm.
5. the preparation method of the shelf platform-specific Wear-resistant corrosion-resistant steel plate as described in any claim in claim 1-4,
It is characterized in that: comprise the steps of
(i) molten iron pretreatment:
Using mg powder or mg powder+cao, Sulfur Content in Hot Iron content is dropped to less than 0.005%, the pretreated temperature of molten iron: 1150-
1170℃；
(ii) top and bottom combined blown converter smelting；
Terminal Composition Control requires: p≤0.008%, n≤0.006%；Outlet temperature controls at 1560-1580 DEG C, adds rare earth
Trace element；Ladle temperature control is at 1610-1630 DEG C；The whole atm number of tapping process stirs, and tolerance is 450-750l/min,
Go out little tolerance stirring after steel, tolerance is 10-50 l/min；
(iii) lf stove refine:
Electrode submerged arc and micro-pressure operation, prevent nitrogen pick-up and carburetting；Using high-power power supply, power is 8000w-9000w, energising
In 10-12min, lf puts into ca after processing to time control；
(iv) rh Fruit storage:
Rh condition of high vacuum degree≤5.0mbar, retention time 20-22min；Vacuum carries out Calcium treatment to molten steel, after Calcium treatment after terminating
Molten steel is carried out with quiet stir process, soft blow time 15-17min；
(v) continuous casting:
Stability contorting pulling rate, liquid level fluctuation of crystallizer controls within ± 3mm, and the middle bag degree of superheat controls within 20 DEG C；
(vi) slab prepares steel plate through thermomechanical controlled rolling and controlled cooling technique:
Roughing finishing temperature is 1150-1170 DEG C, and entrance finishing temperature is 730-750 DEG C, and finishing temperature is 670-690 DEG C, heat
Adopt the air-cooled cooldown rate with 2-4 DEG C/s that slab is cooled to 550-570 DEG C after rolling, then adopt water-cooled with the cooling of 4-6 DEG C/s
Slab water-cooled to 370-390 DEG C, is adopted compressed air or vaporific quenching liquid with the cooldown rate of 7-9 DEG C/s, slab is cold by speed
To room temperature, thus obtaining the pearlite of fine ferrite and Dispersed precipitate, and no banded structure；
(vii) the thermally treated technique of steel plate prepares shelf platform-specific Wear-resistant corrosion-resistant steel plate:
Steel plate is heated to 1250-1270 DEG C by tempering furnace tempering, after coming out of the stove, 950-770 is cooled fast to by compressed air
DEG C, through the first refrigerating work procedure, steel plate fast speed is cooled to 570-590 DEG C online, then is cooled to often by the second cooling technique
Temperature；
Described first refrigerating work procedure: adopt compressed air or vaporific quenching liquid to be cooled to steel plate with the cooldown rate of 15-17 DEG C/s
570-590℃；
Described second refrigerating work procedure: be combined with air cooling using water-cooled, first adopt water-cooled with the cooldown rate of 7-9 DEG C/s by steel plate water
Be cooled to 420-450 DEG C, be then air cooled to 350-370 DEG C, then adopt water-cooled with the cooldown rate of 4-6 DEG C/s by steel plate water-cooled to room
Temperature；
By thermomechanical controlled rolling and controlled cooling technique above and be thermally treated resulting in reasonable two fine ferrite compared and pearl
Body of light.
6. shelf platform-specific Wear-resistant corrosion-resistant steel plate as claimed in claim 5 preparation method it is characterised in that: comprise with
Lower step:
(i) molten iron pretreatment:
Using mg powder or mg powder+cao, Sulfur Content in Hot Iron content is dropped to less than 0.005%, the pretreated temperature of molten iron: 1150 DEG C；
(ii) top and bottom combined blown converter smelting；
Terminal Composition Control requires: p≤0.008%, n≤0.006%；Outlet temperature controls at 1560 DEG C, adds the micro unit of rare earth
Element；Ladle temperature control is at 1610 DEG C；The whole atm number of tapping process stirs, and tolerance is 450l/min, has gone out little tolerance after steel
Stirring, tolerance is 10-50 l/min；
(iii) lf stove refine:
Electrode submerged arc and micro-pressure operation, prevent nitrogen pick-up and carburetting；Using high-power power supply, power is 8000w, and conduction time is controlled
In 10min, lf puts into ca after processing to system；
(iv) rh Fruit storage:
Rh condition of high vacuum degree≤5.0mbar, retention time 20min；Vacuum carries out Calcium treatment to molten steel, to steel after Calcium treatment after terminating
Water carries out quiet stir process, soft blow time 15min；
(v) continuous casting:
Stability contorting pulling rate, liquid level fluctuation of crystallizer controls within ± 3mm, and the middle bag degree of superheat controls within 20 DEG C；
(vi) slab prepares steel plate through thermomechanical controlled rolling and controlled cooling technique:
Roughing finishing temperature be 1150 DEG C, entrance finishing temperature be 730 DEG C, finishing temperature be 670 DEG C, adopt after hot rolling air-cooled with
Slab is cooled to 550 DEG C by the cooldown rate of 2 DEG C/s, then adopt water-cooled with the cooldown rate of 4 DEG C/s by slab water-cooled to 370 DEG C,
Adopt compressed air or vaporific quenching liquid, with the cooldown rate of 7 DEG C/s, slab is cooled to room temperature, thus obtain fine ferrite and
The pearlite of Dispersed precipitate, and no banded structure；
(vii) the thermally treated technique of steel plate prepares shelf platform-specific Wear-resistant corrosion-resistant steel plate:
Steel plate is heated to 1250 DEG C by tempering furnace tempering, is cooled fast to 950 DEG C by compressed air after coming out of the stove, online warp
Steel plate fast speed is cooled to 570 DEG C by the first refrigerating work procedure, then is cooled to room temperature by the second cooling technique；
Described first refrigerating work procedure: adopt compressed air or vaporific quenching liquid, with the cooldown rate of 15 DEG C/s, steel plate is cooled to 570
℃；
Described second refrigerating work procedure: be combined with air cooling using water-cooled, first adopt water-cooled with the cooldown rate of 7 DEG C/s by steel plate water-cooled
To 420 DEG C, be then air cooled to 350 DEG C, then adopt water-cooled with the cooldown rate of 4 DEG C/s by steel plate water-cooled to room temperature.
7. shelf platform-specific Wear-resistant corrosion-resistant steel plate as claimed in claim 5 preparation method it is characterised in that: comprise with
Lower step:
(i) molten iron pretreatment:
Using mg powder or mg powder+cao, Sulfur Content in Hot Iron content is dropped to less than 0.005%, the pretreated temperature of molten iron: 1160 DEG C；
(ii) top and bottom combined blown converter smelting；
Terminal Composition Control requires: p≤0.008%, n≤0.006%；Outlet temperature controls at 1570 DEG C, adds the micro unit of rare earth
Element；Ladle temperature control is at 1620 DEG C；The whole atm number of tapping process stirs, and tolerance is 550l/min, has gone out little tolerance after steel
Stirring, tolerance is 35 l/min；
(iii) lf stove refine:
Electrode submerged arc and micro-pressure operation, prevent nitrogen pick-up and carburetting；Using high-power power supply, power is 8500w, and conduction time is controlled
In 11min, lf puts into ca after processing to system；
(iv) rh Fruit storage:
Rh condition of high vacuum degree≤5.0mbar, retention time 21min；Vacuum carries out Calcium treatment to molten steel, to steel after Calcium treatment after terminating
Water carries out quiet stir process, soft blow time 16min；
(v) continuous casting:
Stability contorting pulling rate, liquid level fluctuation of crystallizer controls within ± 3mm, and the middle bag degree of superheat controls within 20 DEG C；
(vi) slab prepares steel plate through thermomechanical controlled rolling and controlled cooling technique:
Roughing finishing temperature be 1160 DEG C, entrance finishing temperature be 740 DEG C, finishing temperature be 680 DEG C, adopt after hot rolling air-cooled with
Slab is cooled to 560 DEG C by the cooldown rate of 3 DEG C/s, then adopt water-cooled with the cooldown rate of 5 DEG C/s by slab water-cooled to 380 DEG C,
Adopt compressed air or vaporific quenching liquid, with the cooldown rate of 8 DEG C/s, slab is cooled to room temperature, thus obtain fine ferrite and
The pearlite of Dispersed precipitate, and no banded structure；
(vii) the thermally treated technique of steel plate prepares shelf platform-specific Wear-resistant corrosion-resistant steel plate:
Steel plate is heated to 1260 DEG C by tempering furnace tempering, is cooled fast to 960 DEG C by compressed air after coming out of the stove, online warp
Steel plate fast speed is cooled to 580 DEG C by the first refrigerating work procedure, then is cooled to room temperature by the second cooling technique；
Described first refrigerating work procedure: adopt compressed air or vaporific quenching liquid, with the cooldown rate of 16 DEG C/s, steel plate is cooled to 580
℃；
Described second refrigerating work procedure: be combined with air cooling using water-cooled, first adopt water-cooled with the cooldown rate of 8 DEG C/s by steel plate water-cooled
To 430 DEG C, be then air cooled to 360 DEG C, then adopt water-cooled with the cooldown rate of 5 DEG C/s by steel plate water-cooled to room temperature.
8. shelf platform-specific Wear-resistant corrosion-resistant steel plate as claimed in claim 5 preparation method it is characterised in that: comprise with
Lower step:
(i) molten iron pretreatment:
Using mg powder or mg powder+cao, Sulfur Content in Hot Iron content is dropped to less than 0.005%, the pretreated temperature of molten iron: 1150-
1170℃；
(ii) top and bottom combined blown converter smelting；
Terminal Composition Control requires: p≤0.008%, n≤0.006%；Outlet temperature controls at 1580 DEG C, adds the micro unit of rare earth
Element；Ladle temperature control is at 1630 DEG C；The whole atm number of tapping process stirs, and tolerance is 750l/min, has gone out little tolerance after steel
Stirring, tolerance is 50 l/min；
(iii) lf stove refine:
Electrode submerged arc and micro-pressure operation, prevent nitrogen pick-up and carburetting；Using high-power power supply, power is 9000w, and conduction time is controlled
In 12min, lf puts into ca after processing to system；
(iv) rh Fruit storage:
Rh condition of high vacuum degree≤5.0mbar, retention time 22min；Vacuum carries out Calcium treatment to molten steel, to steel after Calcium treatment after terminating
Water carries out quiet stir process, soft blow time 17min；
(v) continuous casting:
Stability contorting pulling rate, liquid level fluctuation of crystallizer controls within ± 3mm, and the middle bag degree of superheat controls within 20 DEG C；
(vi) slab prepares steel plate through thermomechanical controlled rolling and controlled cooling technique:
Roughing finishing temperature be 1170 DEG C, entrance finishing temperature be 750 DEG C, finishing temperature be 690 DEG C, adopt after hot rolling air-cooled with
Slab is cooled to 570 DEG C by the cooldown rate of 4 DEG C/s, then adopt water-cooled with the cooldown rate of 6 DEG C/s by slab water-cooled to 390 DEG C,
Adopt compressed air or vaporific quenching liquid, with the cooldown rate of 9 DEG C/s, slab is cooled to room temperature, thus obtain fine ferrite and
The pearlite of Dispersed precipitate, and no banded structure；
(vii) the thermally treated technique of steel plate prepares shelf platform-specific Wear-resistant corrosion-resistant steel plate:
Steel plate is heated to 1270 DEG C by tempering furnace tempering, is cooled fast to 770 DEG C by compressed air after coming out of the stove, online warp
Steel plate fast speed is cooled to 590 DEG C by the first refrigerating work procedure, then is cooled to room temperature by the second cooling technique；
Described first refrigerating work procedure: adopt compressed air or vaporific quenching liquid, with the cooldown rate of 17 DEG C/s, steel plate is cooled to 590
℃；
Described second refrigerating work procedure: be combined with air cooling using water-cooled, first adopt water-cooled with the cooldown rate of 9 DEG C/s by steel plate water-cooled
To 450 DEG C, be then air cooled to 370 DEG C, then adopt water-cooled with the cooldown rate of 6 DEG C/s by steel plate water-cooled to room temperature.
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Effective date of registration: 20161025 Address after: 215104 Suzhou, Wuzhong District Yue Creek Street, Swan Road, No. 10 Applicant after: Suzhou Jing Yuan oil pressure Machinery Co., Ltd. Address before: Suzhou City, Jiangsu province Wuzhong District town 215100 Pu Zhuang Road No. 3058 Applicant before: Suzhou Ke Sheng Storage and circulation equipment Co., Ltd |
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