CN102330020B - Manufacturing method for high-toughness steel plates with yield strength of 345 to 390MPa - Google Patents
Manufacturing method for high-toughness steel plates with yield strength of 345 to 390MPa Download PDFInfo
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Abstract
The invention relates to a manufacturing method for high-toughness steel plates with yield strength of 345 to 390MPa. The method comprises the following steps of: performing desulfurization on blast furnace molten iron, smelting the desulfurized molten iron into molten steel by adopting an oxygen top-bottom composite blowing converter, performing deoxidation by adopting SiFe or MnFe alloy, and alloying; performing final deoxidation by adopting TiFe alloy, keeping oxygen content at 10 to 40PPm, introducing argon for continuous casting, and stacking and slowly cooling casting blanks; heating the casting blanks at the temperature of between 1,130 and 1,250 DEG C, rolling the casting blanks by adopting austenitic re-crystallization, and controlling rolling and final rolling temperature, thickness of intermediate blanks, rolling and final rolling temperature of an austenitic non-re-crystallization area and rolling thickness; controlling cold by adopting an air-cooled steam condenser (ACC) process after rolling, controlling cooling velocity, water supply and drainage ratio and self-tempering temperature of steel plates, and treating the steel plates by adopting a normalizing and accelerated cooling process; and controlling the normalizing temperature and time, the cooling velocity and the self-tempering temperature of the steel plates. According to the method, the production cost is low, the production process is simple and easily controlled, the steel plates are suitable for multiple welding modes, and the steel plates can be widely applied to low-alloy high-strength steel, bridge steel, building steel, hull steel and the like.
Description
Technical field
The present invention relates to belong to low-alloy high-strength Plate Production technical field, relate generally to the manufacture method that a kind of yield strength is 345～390MPa ductility steel plate
Background technology
Yield strength is that the E grade steel plate of 345～390MPa is mainly used in low-alloy high-strength with steel, bridge steel plate, construction(al)steel, ship steel etc., belongs to high-end product, and is larger in the plate of moderate thickness apparent consumption.Plate Production technique is divided into the delivery of controlled rolling state or as-normalized condition delivery by condition of delivery, and the steel plate of thickness specification 〉=50mm is in the majority with as-normalized condition delivery, and the steel plate low-temperature performance of as-normalized condition delivery is better than the steel plate of controlled rolling state delivery.For guaranteeing-40 ℃ of low temperature impact properties of steel, steel mill generally all adds noble metal element Ni in the steel plate Composition Design, to reduce the Cold Brittleness Transition Temperature of steel, the use properties of stabilized steel under the low temperature severe environment.Low-temperature steel chemical ingredients (%) requires to see Table 1 both at home and abroad.
Table 1 low-temperature steel chemical ingredients (%) requirement both at home and abroad
| The trade mark | Standard | C | P | S | Ni | Use temperature ℃ |
| 16MnDR | GB 3531 | ≤0.20 | ≤0.025 | ≤0.012 | ≤0.40 | -30 or-40 |
| 15MnNiDR | GB 3531 | ≤0.18 | ≤0.025 | ≤0.012 | 0.20～0.60 | -45 |
| 09MnNiDR | GB 3531 | ≤0.12 | ≤0.020 | ≤0.012 | 0.30～0.80 | -70 |
| E36 | GB 712 | ≤0.18 | ≤0.035 | ≤0.035 | ≤0.40 | -40 |
| F36 | GB 712 | ≤0.18 | ≤0.025 | ≤0.025 | ≤0.80 | -60 |
| S355N | EN 10028 | ≤0.20 | ≤0.030 | ≤0.025 | ≤0.50 | -20 or-30 |
| S355NL | EN 10028 | ≤0.18 | ≤0.025 | ≤0.020 | ≤0.50 | -50 |
As can be seen from Table 1, to the requirement of listed trade mark composition, the use temperature reduction Ni content increase along with steel plate illustrates that Ni can significantly improve the toughness, particularly low-temperature flexibility of steel in GB 3531, GB 712 and EN 10028 standards.
Problem is that steel mill is for reducing production costs, do not add element Ni in Composition Design: a kind of method adopts S, P content in the limited reduction steel, but in the identical situation of processing condition, no matter be the steel plate that controlled rolling state or as-normalized condition are produced,-40 ℃ of low temperature impact properties are unstable, qualification rate is all lower, is difficult to satisfy the requirement of steel plate supply of material technical qualification; Another kind method is added Re or Ca (inclusion modification spheroidizing) etc. in steel, expectation makes steel impelling strength reach the effect same of Ni in steel, for this reason, each steel mill has carried out a large amount of experimental studies to add-on and the adding method of Re or Ca processing, obtained certain effect, but actual effect does not reach Ni contribution to low-temperature flexibility in steel, show-40 ℃ of low temperature impact properties unstable (two high one low phenomenons appear in impact value), steel plate inspection qualification rate decline (having increased the impact of foreign impurity).These two kinds of methods have all increased production cost in addition.
Summary of the invention
The present invention is intended to reduce prototype steel grade manufacturing cost, and for the above-mentioned background Classification, provides that a kind of production cost is low, process simple, be easy to control; Be suitable for manual metal-arc welding, union-melt weld and shielded welding welding manufacturing process, the yield strength that has excellent mechanical property after the welding is the manufacture method of 345～390MPa ductility steel plate.
The implementation of the object of the invention is, yield strength is the manufacture method of 345～390MPa ductility steel plate, and concrete steps are as follows:
1) blast-melted desulfurization adopts the oxygen top and bottom combined blown converter smelting to become molten steel, adopts SiFe, MnFe alloy to carry out deoxidation, and carry out alloying; Oxygen level≤60PPm after the deoxidation in the molten steel;
2) TiFe alloy final deoxygenation is adopted in refining, and the maintenance oxygen level is 10PPm～40PPm, and temperature is controlled at 1595 ℃～1565 ℃, then connects argon gas, argon flow amount 1.0m
3/ min～2.0m
3/ min, protection continuous casting, casting blank stacking slow cooling 24h～48h, slab thickness 150mm～300mm;
The chemical ingredients of strand (%, wt, heat analysis) is as follows:
C:0.08～0.20, Si:0.03～0.55, Mn:0.80～1.70, P≤0.015, S≤0.010, Nb:0.01～0.07, V:0.015～0.15, Ti:0.005～0.035, N:0.003～0.012, all the other inevitably are mingled with for Fe reaches, and the carbon equivalent calculation formula is: CEV=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15, and content is controlled at 0.38～0.44%;
3) rolling, slab heating temperature is 1130 ℃～1250 ℃, heating rate 8min/cm～11min/cm; Adopt the two-stage rolling, the fs adopts austenite recrystallization rolling, 1100 ℃～1180 ℃ of start rolling temperatures, 1050 ℃～1120 ℃ of finishing temperatures, workpiece thickness 50mm～160mm; Subordinate phase austenite non-recrystallization is rolling, 850 ℃～940 ℃ of start rolling temperatures, 780 ℃～860 ℃ of finishing temperatures; The steel plate of rolling thickness 10～100mm;
4) it is cold to roll the control of rear employing ACC technique, and speed of cooling is 3 ℃/S～10 ℃/S, Mulpic accelerate cooling up and down the water ratio be controlled at 1: 1.1～1: 1.80 scope; The steel plate red temperature is 650 ℃～750 ℃; The steel plate of as-normalized condition delivery need adopt normalizing+accelerated cooling process: normalizing temperature is 880 ℃～930 ℃, the normalizing time is 1.2min/mm～2.0min/mm, speed of cooling is 2 ℃/S～6 ℃/S, the steel plate red temperature is 680 ℃～800 ℃, and obtaining yield strength is 345～390MPa high tenacity E grade steel plate.
Advantage of the present invention is as follows:
1, the chemical composition design of steel is aided with one or more microalloy elements that add among Nb, V, the Ti based on C, Si, Mn, P, S element, does not add noble metal element Ni, thereby reduces the production cost of original shape steel; Do not add the elements such as Ca, Re, not newly-increased production cost has reduced simultaneously foreign impurity, has purified steel, to guarantee the steel plate inspection qualification rate;
2, the spherical complex inclusion that form take titanium oxide as core in the steel, the disperse of nano level small size distributes impels the intragranular acicular ferrite forming core and grows up, and improves steel plate impelling strength by cutting apart original austenite grain, reduces the ductile-brittle transition temperature of steel;
3, satisfying the thickness specification is 10～100mm, yield strength is the E grade steel plate technical requirements of 345～390MPa, low temperature impact properties-40 ℃ 〉=100J, can be adapted to manual metal-arc welding, union-melt weld and shielded welding welding manufacturing process, have excellent mechanical property behind the Plate Welding;
4, production process simple, be easy to control, be applicable to make the application specific architecture steel such as low-alloy high-tensile structural steel and Bridge Steel, building iron and ship steel.
The present invention puts into practice in the production of Wuhan Iron and Steel Plant Bridge Steel, and successful has reduced production cost, and can produce long-range economic benefit.
Embodiment
The present invention is: blast-melted desulfurization, and adopt the oxygen top and bottom combined blown converter smelting to become molten steel, adopt SiFe, MnFe alloy to carry out deoxidation, and carry out alloying, the oxygen level≤60PPm after the deoxidation in the molten steel; Then adopt TiFe alloy final deoxygenation, the maintenance oxygen level is 10PPm～40PPm, logical argon gas continuous casting, casting blank stacking slow cooling.
The chemical ingredients (%, wt, heat analysis) of base casting is as follows:
C:0.08～0.20, Si:0.03～0.55, Mn:0.80～1.70, P≤0.015, S≤0.010, Nb:0.01～0.07, V:0.015～0.15, Ti:0.005～0.035, N:0.003～0.012, all the other inevitably are mingled with for Fe reaches, and the carbon equivalent calculation formula is: CEV=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15, content is controlled at 0.38～0.44%.
1130 ℃～1250 ℃ heating of strand, heating rate 8min/cm～11min/cm.Adopt two sections rolling, the fs austenite recrystallization is rolling, 1100 ℃～1180 ℃ of open rollings, finishing temperature is 1050 ℃-1120 ℃, workpiece thickness 50mm～160mm; Subordinate phase austenite non-recrystallization is rolling, 850 ℃-940 ℃ of start rolling temperatures, 780 ℃-860 ℃ of finishing temperatures, rolling thickness 10mm-100mm.It is cold to roll the control of rear employing ACC technique, speed of cooling is 3 ℃/S～10 ℃/S, accelerate cooling up and down the water ratio be controlled at 1: 1.1～650 ℃～750 ℃ of 1: 1.80 scopes, steel plate red temperature.The steel plate of as-normalized condition delivery need adopt normalizing+accelerated cooling process, 680 ℃-800 ℃ of 2 ℃ of 880 ℃-930 ℃ of normalizing temperatures of control, normalizing time 1.2min/mm-2.0min/mm, speed of cooling/S-6 ℃/S, steel plate red temperature.
The steel plate that adopts the present invention to produce can be adapted to manual metal-arc welding, union-melt weld and shielded welding welding manufacturing process.Welding conditions is: heat input≤45kJ/cm, welding current are that 48～680A, weldingvoltage are that 24～35V, welding speed are 150～34cm/min.Has excellent mechanical property behind the Plate Welding.
Below by specific examples in detail the present invention is described in detail.
For confirming advantage of the present invention, the applicant has made three embodiment, and specific chemical composition sees Table 2.
The chemical ingredients of table 2 steel (%, wt, heat analysis)
| Numbering | C | Si | Mn | P | S | Nb | V | Ti | O | N | CEV |
| Embodiment 1 | 0.08 | 0.30 | 1.65 | 0.015 | 0.008 | 0.020 | - | 0.025 | 0.0012 | 0.012 | 0.367 |
| Embodiment 2 | 0.13 | 0.26 | 1.50 | 0.013 | 0.005 | 0.018 | - | 0.015 | 0.0038 | 0.050 | 0.392 |
| Embodiment 3 | 0.17 | 0.30 | 1.50 | 0.016 | 0.006 | 0.022 | 0.030 | 0.020 | 0.0025 | 0.003 | 0.426 |
Embodiment 1:
1) blast-melted desulfurization adopts the oxygen top and bottom combined blown converter smelting to become molten steel, adopts SiFe, MnFe alloy to carry out deoxidation, and carry out alloying; Oxygen level≤60PPm after the deoxidation in the molten steel.
2) TiFe alloy final deoxygenation is adopted in refining, and the maintenance oxygen level is 10PPm, and temperature is controlled at 1595 ℃～1565 ℃, then connects argon gas (flow 1.0m
3/ min～2.0m
3/ min) protection continuous casting, casting blank stacking slow cooling 24h, slab thickness 150mm.The chemical ingredients of strand satisfies above-mentioned requirements.
3) rolling, slab heating temperature is 1130 ℃, heating rate 8min/cm; Adopt the two-stage rolling, the fs austenite recrystallization is rolling, 1100 ℃ of start rolling temperatures, 1050 ℃ of finishing temperatures, workpiece thickness 50mm, subordinate phase austenite non-recrystallization, 940 ℃ of start rolling temperatures, 780 ℃ of finishing temperatures; Rolling thickness is the steel plate of 10mm.
4) it is cold to roll the control of rear employing ACC technique, and speed of cooling is 3 ℃/S, Mulpic accelerate cooling up and down the water ratio be controlled at 1: 1.8 scope; The steel plate red temperature is 750 ℃; The steel plate of as-normalized condition delivery need adopt normalizing+accelerated cooling process: normalizing temperature is 880 ℃, and the normalizing time is 1.2min/mm, and speed of cooling is 2 ℃/S, and the steel plate red temperature is 800 ℃.Having obtained finished product thickness is 10mm, and yield strength is 345～390MPa high tenacity E grade steel plate.
Embodiment 2:
1) blast-melted desulfurization adopts the oxygen top and bottom combined blown converter smelting to become molten steel, adopts SiFe, MnFe alloy to carry out deoxidation, and carry out alloying; Oxygen level≤60PPm after the deoxidation in the molten steel.
2) TiFe alloy final deoxygenation is adopted in refining, and the maintenance oxygen level is 40PPm, and temperature is controlled at 1595 ℃～1565 ℃, then connects argon gas (flow 1.0m
3/ min～2.0m
3/ min) protection continuous casting, casting blank stacking slow cooling 24h, slab thickness 200mm.The chemical ingredients of strand satisfies above-mentioned requirements.
3) rolling, slab heating temperature is 1180 ℃, heating rate 9min/cm; Adopt the two-stage rolling, the fs austenite recrystallization is rolling, 1150 ℃ of start rolling temperatures, 1080 ℃ of finishing temperatures, workpiece thickness 90mm, subordinate phase austenite non-recrystallization, 890 ℃ of start rolling temperatures, 860 ℃ of finishing temperatures; Rolling thickness is the steel plate of 40mm.
4) it is cold to roll the control of rear employing ACC technique, and speed of cooling is 3 ℃/S, Mulpic accelerate cooling up and down the water ratio be controlled at 1: 1.6 scope; The steel plate red temperature is 720 ℃; The steel plate of as-normalized condition delivery need adopt normalizing+accelerated cooling process: normalizing temperature is 900 ℃, and the normalizing time is 1.4min/mm, and speed of cooling is 3 ℃/S, and the steel plate red temperature is 740 ℃.Having obtained thickness is 40mm, and yield strength is 345～390MPa high tenacity E grade steel plate.
Embodiment 3:
1) blast-melted desulfurization adopts the oxygen top and bottom combined blown converter smelting to become molten steel, adopts SiFe, MnFe alloy to carry out deoxidation, and carry out alloying; Oxygen level≤60PPm after the deoxidation in the molten steel.
2) TiFe alloy final deoxygenation is adopted in refining, and the maintenance oxygen level is 20PPm, and temperature is controlled at 1595 ℃～1565 ℃, then connects argon gas (flow 1.0m
3/ min～2.0m
3/ min) protection continuous casting, casting blank stacking slow cooling 48h, slab thickness 300mm.The chemical ingredients of strand satisfies above-mentioned requirements.
3) rolling, slab heating temperature is 1250 ℃, heating rate 11min/cm; Adopt the two-stage rolling, the fs austenite recrystallization is rolling, 1180 ℃ of start rolling temperatures, 1120 ℃ of finishing temperatures, workpiece thickness 160mm, subordinate phase austenite non-recrystallization, 850 ℃ of start rolling temperatures, 830 ℃ of finishing temperatures; Rolling thickness is the steel plate of 100mm.
4) it is cold to roll the control of rear employing ACC technique, and speed of cooling is 10 ℃/S, Mulpic accelerate cooling up and down the water ratio be controlled at 1: 1.1 scope; The steel plate red temperature is 650 ℃; The steel plate of as-normalized condition delivery need adopt normalizing+accelerated cooling process: normalizing temperature is 930 ℃, and the normalizing time is 2.0min/mm, and speed of cooling is 6 ℃/S, and the steel plate red temperature is 680 ℃.Having obtained thickness is 100mm, and yield strength is 345～390MPa high tenacity E grade steel plate.
The steel plate that embodiment 1～embodiment 3 is produced has carried out flaw detection and mechanical properties test, the results are shown in Table 3.The steel plate that embodiment 1～embodiment 3 is produced has also carried out the actual welding of submerged arc welding, and weldprocedure and joint performance see Table 4.
Table 3 mechanical property of steel plate and flaw detection result
Table 4 steel plate submerged-arc welding process and joint impelling strength
Show from table 3 and table 4 result, the yield strength that adopts the present invention to produce is that 345～390MPa high tenacity E grade steel plate has excellent mechanical property, the weldprocedure of steel plate satisfies fully to be used and manufacturer's working condition, can be widely used in low-alloy high-strength steel, bridge steel plate, construction(al)steel, ship steel etc.
Claims (1)
1. manufacture method that yield strength is 345～390 MPa ductility steel plates is characterized in that concrete steps are as follows:
1) blast-melted desulfurization adopts the oxygen top and bottom combined blown converter smelting to become molten steel, adopts SiFe, MnFe alloy to carry out deoxidation, and carry out alloying; Oxygen level≤60ppm after the deoxidation in the molten steel;
2) TiFe alloy final deoxygenation is adopted in refining, and the maintenance oxygen level is 10ppm～40ppm, and temperature is controlled at 1595 ℃～1565 ℃, then connects argon gas, argon flow amount 1.0 m
3/ min～2.0m
3/ min, protection continuous casting, casting blank stacking slow cooling 24h～48h, slab thickness 150mm～300mm;
The chemical ingredients wt% of strand, heat analysis is as follows:
C:0.08～0.20, Si:0.03～0.55, Mn:0.80～1.70, P≤0.015, S≤0.010, Nb:0.01～0.07, V:0.015～0.15, Ti:0.005～0.035, N:0.003～0.012, all the other inevitably are mingled with for Fe reaches, and the carbon equivalent calculation formula is: CEV=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15, content is controlled at 0.38～0.44%;
3) rolling, slab heating temperature is 1130 ℃～1250 ℃, heating rate 8min/cm～11min/cm; Adopt the two-stage rolling, the fs adopts austenite recrystallization rolling, 1100 ℃～1180 ℃ of start rolling temperatures, 1050 ℃～1120 ℃ of finishing temperatures, workpiece thickness 50mm～160mm; Subordinate phase austenite non-recrystallization is rolling, 850 ℃～940 ℃ of start rolling temperatures, 780 ℃～860 ℃ of finishing temperatures; The steel plate of rolling thickness 10～100mm;
4) it is cold to roll the control of rear employing ACC technique, and speed of cooling is 3 ℃/s～10 ℃/s, Mulpic accelerate cooling up and down the water ratio be controlled at 1:1.1～1:1.80 scope; The steel plate red temperature is 650 ℃～750 ℃; The steel plate of as-normalized condition delivery need adopt normalizing+accelerated cooling process: normalizing temperature is 880 ℃～930 ℃, the normalizing time is 1.2min/mm～2.0min/mm, speed of cooling is 2 ℃/s～6 ℃/s, the steel plate red temperature is 680 ℃～800 ℃, and obtaining yield strength is 345～390 MPa high tenacity E grade steel plates.
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| CN102199724A (en) * | 2011-04-25 | 2011-09-28 | 江苏省沙钢钢铁研究院有限公司 | Alloy reduced ship plate steel with yield strength of 355MPa and preparation process thereof |
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Effective date of registration: 20180322 Address after: No. 215, Wuchang Avenue, Hubei, Ezhou, Hubei Patentee after: Echeng Iron and Steel Co., Ltd., of Wuhan Iron and Steel Group Address before: 430080 Wuchang, Hubei Friendship Road, No. A, block, floor 999, 15 Patentee before: Wuhan Iron & Steel (Group) Corp. |
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Address after: No. 215, Wuchang Avenue, Hubei, Ezhou, Hubei Patentee after: Baowu group Echeng Iron and Steel Co., Ltd Address before: No. 215, Wuchang Avenue, Hubei, Ezhou, Hubei Patentee before: WUHAN IRON AND STEEL GROUP ECHENG IRON AND STEEL Co.,Ltd. |
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