CN106521333A - Large-thickness ultra-width Q345E-Z35 steel plate and production method thereof - Google Patents

Large-thickness ultra-width Q345E-Z35 steel plate and production method thereof Download PDF

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CN106521333A
CN106521333A CN201610955881.1A CN201610955881A CN106521333A CN 106521333 A CN106521333 A CN 106521333A CN 201610955881 A CN201610955881 A CN 201610955881A CN 106521333 A CN106521333 A CN 106521333A
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steel plate
temperature
wide
steel
production method
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邓建军
陈起
韦明
吕建会
肖雄峰
刘彦强
管秀兵
莫德敏
郭恒斌
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Wuyang Iron and Steel Co Ltd
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Wuyang Iron and Steel Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/28—Normalising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention discloses a large-thickness ultra-width Q345E-Z35 steel plate and a production method thereof. The production method comprises steps of smelting, die casting, forging cutting, heating, rolling, hot stacking, normalizing, and tempering. The large-thickness ultra-width Q345E-Z35 steel plate is composed of, by weight, 0.15%<=C<=0.17%, 0.10%<=Si<=0.50%, 1.00%<=Mn<=1.25%, P<=0.015%, S<=0.004%, 0.020%<=Al<=0.050%, 0.020%<=Nb<=0.050%, 0.030%<=V<=0.050%, 0.15%<=Cr<=0.25%, and the balance Fe and inevitable impurities. The large-thickness ultra-width Q345E-Z35 steel plate is capable of satisfying requirements of domestic and overseas large-scale water power and wind power projects on super thickness, super width, low temperature operation, high toughness, and high-grade flaw detection; is uniform in mechanical properties and plate shape; possesses excellent comprehensive mechanical properties and welding performance; is prepared from forged ingots; is capable of satisfying requirements of I grade in GB/T2970; and possesses excellent toughness; and the maximum thickness is 350mm, the maximum width is 3950mm, and the minimum length is 3950mm.

Description

Big thickness ultra-wide Q345E-Z35 steel plate and its production method
Technical field
The present invention relates to a kind of low alloy steel plate, especially a kind of big thickness ultra-wide Q345E-Z35 steel plate and its producer Method.
Background technology
Q345E steel has higher intensity, good cold deformation ability, excellent plasticity and toughness because of which, extensively should In manufacture for the significant points of the equipment such as crane, mining machinery, wind-powered electricity generation, water power.It is quick with Chinese national economy Development and large-span steel project are continuously increased, the industry Q345E steel plates such as water power, wind-powered electricity generation, machine-building, especially Be Wide and Thick Slab market demand it is increasing, while more and more stricter to the prescription of steel plate.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of big thickness ultra-wide Q345E-Z35 steel plate of function admirable；This Invention additionally provides a kind of production method of big thickness ultra-wide Q345E-Z35 steel plate.
To solve above-mentioned technical problem, the present invention is made up of the composition of following weight percentage：0.15%≤C≤ 0.17%, 0.10%≤Si≤0.50%, 1.00%≤Mn≤1.25%, P≤0.015%, S≤0.004%, 0.020%≤Al≤ 0.050%, 0.020%≤Nb≤0.050%, 0.030%≤V≤0.050%, 0.15%≤Cr≤0.25% and can not be kept away balance of Fe The impurity exempted from.
The maximum gauge of steel plate of the present invention is 350mm, and Breadth Maximum is 3950mm.
Carbon equivalent Ceq=C+Mn/6+ (Cr+Mo+V) of steel plate of the present invention/5+ (Cu+Ni)/15≤0.45.
The inventive method is using smelting, molding, forging cutting, heating, rolling, thermal reactor pile, normalizing and tempering process；It is described Steel plate is made up of the composition of above-mentioned weight percentage.
Heating process described in the inventive method：Maximum heating temperature≤1260 DEG C；When less than 1000 DEG C, firing rate≤ 120℃/h；Total heating coefficient >=the 9min/cm of steel ingot；1220 DEG C～1240 DEG C of soaking temperature, soaking time >=6h.
Rolling process described in the inventive method：Using using two-stage controlled rolling process；1050 DEG C of the start rolling temperature of first stage ～1150 DEG C；Steel thickness >=the H+50mm that dries in the air of second stage, wherein H be steel plate target thickness, unit mm, start rolling temperature≤950 DEG C, finishing temperature≤900 DEG C.
Thermal reactor pile operation described in the inventive method：650 DEG C～680 DEG C of stacking temperature, stacking time 70h～90h.
Normalizing process described in the inventive method：910 DEG C ± 10 DEG C of normalizing temperature, heat insulating coefficient 1.8mm/min～2.5mm/ min；Rapid cooling after normalizing, control red temperature is at 480 DEG C～650 DEG C.In the normalizing process, enter after normalizing 35 DEG C of temperature and with Under water in rapid cooling 8min～13min.
Tempering process described in the inventive method：610 DEG C～630 DEG C of temperature, heat insulating coefficient 2.5mm/min～3.5mm/ min；After tempering, air cooling of coming out of the stove.
Using the beneficial effect produced by above-mentioned technical proposal it is：Steel plate Q345EZ35 of the present invention meets big both at home and abroad The projects such as type water power, wind-powered electricity generation are for the demand of ultra-wide super thick, low temp operation, high-strength tenacity and high-level flaw detection, the power of steel plate Learn performance uniform, template is good.
Steel plate obtained by the inventive method has good comprehensive mechanical property and welding performance；Ceq≤0.45（Ceq=C+ Mn/6+(Cr+Mo+V)/5+(Cu+Ni)/15）；Steel plate is become a useful person using ingot for forging, and maximum gauge is 350mm, and Breadth Maximum is 3950mm, minimum length are 3950mm, and meet I grade of requirement of GB/T2970；Steel plate has good obdurability.
Specific embodiment
With reference to specific embodiment, the present invention is further detailed explanation.
This big thickness ultra-wide Q345E-Z35 steel plate is produced using following methods：
（1）Smelting procedure：Molten steel elder generation Jing electric furnace smeltings, are re-fed into LF refining furnace refine；Liquid steel temperature reaches（1620±10）℃ After proceed to VD stove Fruit storages, add CaSi blocks >=1kg/t to change inclusion morphology before VD；The vacuum of VD stoves≤ 66.6Pa, vacuum retention time >=20min, it is ensured that field trash, effective exclusion of gas, it is ensured that molten steel it is pure；Tapping molten steel It is made up of the composition of following weight percentage：0.15%≤C≤0.17%, 0.10%≤Si≤0.50%, 1.00%≤Mn≤ 1.25%, P≤0.015%, S≤0.004%, 0.020%≤Al≤0.050%, 0.020%≤Nb≤0.050%, 0.030%≤V≤ 0.050%, 0.15%≤Cr≤0.25%, balance of Fe and inevitable impurity.
（2）Molding operations：Using inert gas shielding, by the pouring molten steel after smelting into ten six-edged steel ingots.
（3）Forging cutting action：After steel ingot forging, width is 2000mm～2200mm, and thickness is 755mm～765mm, long Spend for 3980mm～4020mm；Ingot for forging adopts flame cutting, blank to cut final size and be（755mm～765mm）× （2000mm～2200mm）×（3850mm～3900mm）.
（4）Heating process：Maximum heating temperature≤1260 DEG C；During 1000 DEG C of temperature below, firing rate≤120 DEG C/h； Total heating coefficient >=the 9min/cm of steel ingot；1220 DEG C～1240 DEG C of soaking temperature, soaking time >=6h.
（5）Rolling process：Using two-stage controlled rolling process；First stage be the austenite recrystallization stage, start rolling temperature 1050 DEG C～1150 DEG C, when the longitudinal broadening in steel plate edge is to 4100mm～4150mm, turn steel transverse rolling on earth；Second stage is austenite In the non-recrystallization stage, dry in the air steel thickness >=H+50mm, and wherein H is steel plate target thickness, unit mm, and the start rolling temperature of two-stage≤ 950 DEG C, finishing temperature≤900 DEG C.
（6）Thermal reactor pile operation：The stacking of wind sheltering in time, 650 DEG C～680 DEG C of stacking temperature, stacking time 70h～90h after rolling.
（7）Normalizing process：910 DEG C ± 10 DEG C of normalizing temperature, heat insulating coefficient 1.8mm/min～2.5mm/min；Steel plate is incubated After time arrives, hung out into quenching tank immediately and enter water rapid cooling, quenching tank water temperature is controlled at 35 DEG C and following, rapid cooling 8min～13min After hang out air cooling, control red temperature is between 480 DEG C～650 DEG C.
（8）Tempering process：610 DEG C～630 DEG C of temperature, heat insulating coefficient 2.5mm/min～3.5mm/min；Steel plate is protected After the warm time arrives, air cooling of coming out of the stove.
This big thickness ultra-wide Q345E-Z35 steel plate has following characteristics：Steel plate is become a useful person using ingot for forging, and maximum gauge is 350mm, Breadth Maximum are 3950mm, and minimum length is 3950mm, and meet I grade of requirement of GB/T2970；Ceq≤0.45（Ceq =C+Mn/6+(Cr+Mo+V)/5+(Cu+Ni)/15）；At steel plate thickness of slab 1/2, mechanical property meets table 1 and requires.
Table 1：The mechanical property of this Q345E-Z35 steel plates
In table 1：Elongation percentage L0=5.65 ×, S0For original gauge length, S0For original section area.
Embodiment 1：The concrete production technology of this big thickness ultra-wide Q345E-Z35 steel plate is as described below.
（1）Smelt and molding operations：Molten steel elder generation Jing electric furnace smeltings, then Jing LF refining furnace refines；Liquid steel temperature reaches 1620 VD stove Fruit storages are proceeded to after DEG C, CaSi block 1kg/t before VD, are added；Vacuum 64Pa of VD stoves, vacuum retention time 25min；Tapping molten steel is made up of the composition of following weight percent：C 0.17%, Si 0.48%, Mn 1.23%, P 0.014%, S 0.004%, Al 0.046%, Nb 0.047%, V 0.046%, Cr 0.24%, balance of Fe are miscellaneous with inevitable Matter.Poured into a mould using inert gas shielding, the molten steel after smelting is poured into into ten six-edged steel ingots, a diameter of 2100mm of steel ingot, weight is about For 70 tons.
（2）Forging cutting action：It is 2130mm that steel ingot is first forged into width, and thickness is 762mm, and length is 4010mm；Again Using flame cutting, blank cutting final size is 762mm × 2130mm × 3890mm.
（3）Heating process：1250 DEG C of maximum heating temperature, during 1000 DEG C of temperature below, firing rate is 110 DEG C/h；Steel The total heating coefficient of ingot is 10min/cm；1235 DEG C of soaking temperature, soaking time 6.5h.
（4）Rolling and thermal reactor pile operation：1150 DEG C of first stage start rolling temperature, when the longitudinal broadening in steel plate edge is to 4140mm, Turn steel transverse rolling on earth；Second stage is dried in the air steel thickness 460mm, and start rolling temperature is 940 DEG C, and finishing temperature is 880 DEG C；Gained steel plate is thick The size of product is 350mm × 4180mm × 4510mm.675 DEG C of stacking temperature, stacking time 90h.
（5）Normalizing and tempering process：920 DEG C of normalizing temperature, heat insulating coefficient 2.2mm/min；Enter 32 DEG C of water after insulation immediately Middle rapid cooling, hangs out air cooling after 10min, red temperature is at 560 DEG C.620 DEG C of temperature, heat insulating coefficient 2.8mm/min, insulation After come out of the stove air cooling.
The Ceq of Q345E-Z35 steel plates obtained by the present embodiment is 0.44, the size of finished steel plate be 350mm × 3950mm × 4150mm；I grade for GB/T2970 of qualified rank of detecting a flaw, at thickness of slab 1/2, mechanical property is as shown in table 2.
Table 2：The mechanical property of 1 gained steel plate of embodiment
Embodiment 2：The concrete production technology of this big thickness ultra-wide Q345E-Z35 steel plate is as described below.
（1）Smelt and molding operations：Molten steel elder generation Jing electric furnace smeltings, then Jing LF refining furnace refines；Liquid steel temperature reaches 1630 VD stove Fruit storages are proceeded to after DEG C, CaSi block 1kg/t before VD, are added；Vacuum 64Pa of VD stoves, vacuum retention time 25min；Tapping molten steel is made up of the composition of following weight percent：C 0.16%, Si 0.31%, Mn 1.18%, P 0.010%, S 0.002%, Al 0.036%, Nb 0.035%, V 0.037%, Cr 0.19%, balance of Fe are miscellaneous with inevitable Matter.Poured into a mould using inert gas shielding, the molten steel after smelting is poured into into ten six-edged steel ingots.
（2）Forging cutting action：After steel ingot forging, width is 2110mm, and thickness is 760mm, and length is 4000mm；Adopt again With flame cutting, blank cutting final size is 760mm × 2110mm × 3870mm.
（4）Heating process：1240 DEG C of maximum heating temperature, during 1000 DEG C of temperature below, firing rate is 100 DEG C/h；Steel The total heating coefficient of ingot is 10min/cm；1230 DEG C of soaking temperature, soaking time 6.5h.
（4）Rolling and thermal reactor pile operation：1120 DEG C of first stage start rolling temperature, when the longitudinal broadening in steel plate edge is to 4130mm, Turn steel transverse rolling on earth；Second stage is dried in the air steel thickness 465mm, and start rolling temperature is 920 DEG C, and finishing temperature is 870 DEG C, and gained steel plate is thick The size of product is 350mm × 4160mm × 4500mm.The stacking of wind sheltering in time, 660 DEG C of stacking temperature, stacking time 82h after rolling.
（5）Normalizing and tempering process：910 DEG C of normalizing temperature, heat insulating coefficient 2.1mm/min enter 33 DEG C of water immediately after insulation Middle rapid cooling, hangs out air cooling after 11min, red temperature is at 520 DEG C.620 DEG C of temperature, heat insulating coefficient 3.1mm/min, insulation After come out of the stove air cooling.
The Ceq of Q345E-Z35 steel plates obtained by the present embodiment is 0.42, the size of finished steel plate be 350mm × 3950mm × 4110mm；I grade for GB/T2970 of qualified rank of detecting a flaw, at thickness of slab 1/2, mechanical property is as shown in table 3.
Table 3：The mechanical property of 2 gained steel plate of embodiment
Embodiment 3：The concrete production technology of this big thickness ultra-wide Q345E-Z35 steel plate is as described below.
（1）Smelt and molding operations：Molten steel elder generation Jing electric furnace smeltings, then Jing LF refining furnace refines；Liquid steel temperature reaches 1610 VD stove Fruit storages are proceeded to after DEG C, CaSi block 1.2kg/t before VD, are added；Vacuum 66.6Pa of VD stoves, vacuum keep Time 24min；Tapping molten steel is made up of the composition of following weight percent：C 0.15%, Si 0.22%, Mn 1.25%, P 0.012%, S 0.003%, Al 0.020%, Nb 0.026%, V 0.050%, Cr 0.17%, balance of Fe are miscellaneous with inevitable Matter.Poured into a mould using inert gas shielding, the molten steel after smelting is poured into into ten six-edged steel ingots.
（2）Forging cutting action：After steel ingot forging, width is 2200mm, and thickness is 755mm, and length is 4012mm；Adopt again With flame cutting, blank cutting final size is 755mm × 2200mm × 3900mm.
（4）Heating process：1260 DEG C of maximum heating temperature, during 1000 DEG C of temperature below, firing rate be 105 DEG C/h, steel The total heating coefficient of ingot be 9min/cm, 1225 DEG C of soaking temperature, soaking time 6h.
（4）Rolling and thermal reactor pile operation：1100 DEG C of first stage start rolling temperature, when the longitudinal broadening in steel plate edge is to 4150mm, Turn steel transverse rolling on earth；Second stage is dried in the air steel thickness 420mm, and start rolling temperature is 950 DEG C, and finishing temperature is 890 DEG C.Kept away after rolling in time Wind stacking, 650 DEG C of stacking temperature, stacking time 80h.
（5）Normalizing and tempering process：905 DEG C of normalizing temperature, heat insulating coefficient 2.5mm/min enter 30 DEG C of water immediately after insulation Middle rapid cooling, hangs out air cooling after 8min, red temperature is at 480 DEG C.630 DEG C of temperature, heat insulating coefficient 2.5mm/min, insulation After come out of the stove air cooling.
The Ceq of Q345E-Z35 steel plates obtained by the present embodiment is 0.41, the size of finished steel plate be 350mm × 3950mm × 4110mm；I grade for GB/T2970 of qualified rank of detecting a flaw, at thickness of slab 1/2, mechanical property is as shown in table 4.
Table 4：The mechanical property of 3 gained steel plate of embodiment
Embodiment 4：The concrete production technology of this big thickness ultra-wide Q345E-Z35 steel plate is as described below.
（1）Smelt and molding operations：Molten steel elder generation Jing electric furnace smeltings, then Jing LF refining furnace refines；Liquid steel temperature reaches 1620 VD stove Fruit storages are proceeded to after DEG C, CaSi block 1.5kg/t before VD, are added；Vacuum 65Pa of VD stoves, when vacuum keeps Between 20min；Tapping molten steel is made up of the composition of following weight percent：C 0.16%, Si 0.10%, Mn 1.08%, P 0.015%, S 0.003%, Al 0.050%, Nb 0.020%, V 0.041%, Cr 0.15%, balance of Fe are miscellaneous with inevitable Matter.Poured into a mould using inert gas shielding, the molten steel after smelting is poured into into ten six-edged steel ingots.
（2）Forging cutting action：After steel ingot forging, width is 2080mm, and thickness is 765mm, and length is 4020mm；Adopt again With flame cutting, blank cutting final size is 765mm × 2080mm × 3850mm.
（4）Heating process：1255 DEG C of maximum heating temperature, during 1000 DEG C of temperature below, firing rate be 120 DEG C/h, steel The total heating coefficient of ingot be 12min/cm, 1220 DEG C of soaking temperature, soaking time 7h.
（4）Rolling and thermal reactor pile operation：1100 DEG C of first stage start rolling temperature, when the longitudinal broadening in steel plate edge is to 4100mm, Turn steel transverse rolling on earth；Second stage is dried in the air steel thickness 400mm, and start rolling temperature is 930 DEG C, and finishing temperature is 900 DEG C.Kept away after rolling in time Wind stacking, 680 DEG C of stacking temperature, stacking time 75h.
（5）Normalizing and tempering process：910 DEG C of normalizing temperature, heat insulating coefficient 1.8mm/min enter 32 DEG C of water immediately after insulation Middle rapid cooling, hangs out air cooling after 13min, red temperature is at 600 DEG C.610 DEG C of temperature, heat insulating coefficient 3.2mm/min, insulation After come out of the stove air cooling.
The Ceq of Q345E-Z35 steel plates obtained by the present embodiment is 0.39, the size of finished steel plate be 350mm × 3950mm × 4110mm；I grade for GB/T2970 of qualified rank of detecting a flaw, at thickness of slab 1/2, mechanical property is as shown in table 5.
Table 5：The mechanical property of 4 gained steel plate of embodiment
Embodiment 5：The concrete production technology of this big thickness ultra-wide Q345E-Z35 steel plate is as described below.
（1）Smelt and molding operations：Molten steel elder generation Jing electric furnace smeltings, then Jing LF refining furnace refines；Liquid steel temperature reaches 1620 VD stove Fruit storages are proceeded to after DEG C, CaSi block 1.1kg/t before VD, are added；Vacuum 66Pa of VD stoves, when vacuum keeps Between 28min；Tapping molten steel is made up of the composition of following weight percent：C 0.16%, Si 0.50%, Mn 1.0%, P 0.012%, S 0.002%, Al 0.028%, Nb 0.050%, V 0.030%, Cr 0.25%, balance of Fe are miscellaneous with inevitable Matter.Poured into a mould using inert gas shielding, the molten steel after smelting is poured into into ten six-edged steel ingots.
（2）Forging cutting action：After steel ingot forging, width is 2000mm, and thickness is 762mm, and length is 3980mm；Adopt again With flame cutting, blank cutting final size is 762mm × 2000mm × 3860mm.
（4）Heating process：1245 DEG C of maximum heating temperature, during 1000 DEG C of temperature below, firing rate be 110 DEG C/h, steel The total heating coefficient of ingot be 11min/cm, 1240 DEG C of soaking temperature, soaking time 8h.
（4）Rolling and thermal reactor pile operation：1050 DEG C of first stage start rolling temperature, when the longitudinal broadening in steel plate edge is to 4120mm, Turn steel transverse rolling on earth；Second stage is dried in the air steel thickness 430mm, and start rolling temperature is 930 DEG C, and finishing temperature is 880 DEG C.Kept away after rolling in time Wind stacking, 665 DEG C of stacking temperature, stacking time 70h.
（5）Normalizing and tempering process：900 DEG C of normalizing temperature, heat insulating coefficient 2.0mm/min enter 35 DEG C of water immediately after insulation Middle rapid cooling, hangs out air cooling after 12min, red temperature is at 650 DEG C.620 DEG C of temperature, heat insulating coefficient 3.5mm/min, insulation After come out of the stove air cooling.
The Ceq of Q345E-Z35 steel plates obtained by the present embodiment is 0.39, the size of finished steel plate be 350mm × 3950mm × 4110mm；I grade for GB/T2970 of qualified rank of detecting a flaw, at thickness of slab 1/2, mechanical property is as shown in table 6.
Table 6：The mechanical property of 5 gained steel plate of embodiment

Claims (10)

1. a kind of big thickness ultra-wide Q345E-Z35 steel plate, it is characterised in which is made up of the composition of following weight percentage： 0.15%≤C≤0.17%, 0.10%≤Si≤0.50%, 1.00%≤Mn≤1.25%, P≤0.015%, S≤0.004%, 0.020% ≤ Al≤0.050%, 0.020%≤Nb≤0.050%, 0.030%≤V≤0.050%, 0.15%≤Cr≤0.25%, balance of Fe and Inevitable impurity.
2. big thickness ultra-wide Q345E-Z35 steel plate according to claim 1, it is characterised in that：The maximum of the steel plate is thick Spend for 350mm, Breadth Maximum is 3950mm.
3. big thickness ultra-wide Q345E-Z35 steel plate according to claim 1 and 2, it is characterised in that：The carbon of the steel plate is worked as Amount Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Cu+Ni)/15≤0.45.
4. a kind of production method of big thickness ultra-wide Q345E-Z35 steel plate, it is characterised in that：Which adopts smelting, molding, forging to cut Cut, heat, rolling, thermal reactor pile, normalizing and tempering process；The steel plate is made up of the composition of following weight percentage：0.15% ≤ C≤0.17%, 0.10%≤Si≤0.50%, 1.00%≤Mn≤1.25%, P≤0.015%, S≤0.004%, 0.020%≤Al≤ 0.050%, 0.020%≤Nb≤0.050%, 0.030%≤V≤0.050%, 0.15%≤Cr≤0.25% and can not be kept away balance of Fe The impurity exempted from.
5. the production method of big thickness ultra-wide Q345E-Z35 steel plate according to claim 4, it is characterised in that it is described plus Thermal technology's sequence：Maximum heating temperature≤1260 DEG C；When less than 1000 DEG C, firing rate≤120 DEG C/h；The total heating coefficient of steel ingot >= 9min/cm；1220 DEG C～1240 DEG C of soaking temperature, soaking time >=6h.
6. the production method of big thickness ultra-wide Q345E-Z35 steel plate according to claim 4, it is characterised in that described to roll Operation processed：Using using two-stage controlled rolling process；1050 DEG C～1150 DEG C of the start rolling temperature of first stage；The steel that dries in the air of second stage is thick Degree >=H+50mm, wherein H be steel plate target thickness, unit mm, start rolling temperature≤950 DEG C, finishing temperature≤900 DEG C.
7. the production method of big thickness ultra-wide Q345E-Z35 steel plate according to claim 4, it is characterised in that the heat Stacking operation：650 DEG C～680 DEG C of stacking temperature, stacking time 70h～90h.
8. the production method of big thickness ultra-wide Q345E-Z35 steel plate according to claim 4, it is characterised in that it is described just Firer's sequence：910 DEG C ± 10 DEG C of normalizing temperature, heat insulating coefficient 1.8mm/min～2.5mm/min；Rapid cooling after normalizing, control return red temperature Degree is at 480 DEG C～650 DEG C.
9. the production method of big thickness ultra-wide Q345E-Z35 steel plate according to claim 8, it is characterised in that：It is described just In firer's sequence, after normalizing, enter rapid cooling 8min～13min in 35 DEG C of temperature and following water.
10. the production method of the big thickness ultra-wide Q345E-Z35 steel plate according to claim 4-9 any one, its feature It is, the tempering process：610 DEG C～630 DEG C of temperature, heat insulating coefficient 2.5mm/min～3.5mm/min；After tempering, go out Stove air cooling.
CN201610955881.1A 2016-10-27 2016-10-27 Large-thickness ultra-width Q345E-Z35 steel plate and production method thereof Pending CN106521333A (en)

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CN110551879A (en) * 2019-09-19 2019-12-10 舞阳钢铁有限责任公司 Production method of low-strength-level Cr-Mo steel plate
CN111020399A (en) * 2019-12-12 2020-04-17 舞阳钢铁有限责任公司 Normalized air-cooled steel plate with long-time die welding performance and production method thereof
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CN102912221A (en) * 2012-10-12 2013-02-06 舞阳钢铁有限责任公司 Large-thickness structural steel plate for high-rise building and production method thereof
CN103451562A (en) * 2013-08-29 2013-12-18 舞阳钢铁有限责任公司 Quenched large-thickness easy-to-weld Z-direction high-strength steel plate for water and electricity and production method thereof
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CN109880966A (en) * 2019-02-26 2019-06-14 舞阳钢铁有限责任公司 A kind of smelting process of large-sized forging ingot S35C steel
CN110551879A (en) * 2019-09-19 2019-12-10 舞阳钢铁有限责任公司 Production method of low-strength-level Cr-Mo steel plate
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CN111020399A (en) * 2019-12-12 2020-04-17 舞阳钢铁有限责任公司 Normalized air-cooled steel plate with long-time die welding performance and production method thereof
CN114561528A (en) * 2022-03-01 2022-05-31 舞阳钢铁有限责任公司 Low-hardness easy-to-weld die-welding-resistant high-uniformity high-performance super-thick steel plate and production method thereof

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