CN102080185A - High-tensile quenched and tempered steel plate for large-thickness structures and production method thereof - Google Patents
High-tensile quenched and tempered steel plate for large-thickness structures and production method thereof Download PDFInfo
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Abstract
The invention discloses a high-tensile quenched and tempered steel plate for large-thickness structures and a production method thereof, wherein the high-tensile quenched and tempered steel plate comprises the following chemical compositions in percentage by weight: less than or equal to 0.19% of C, less than or equal to 0.50% of Si, 1.00-1.60% of Mn, less than or equal to 0.015% of P, less than or equal to 0.003% of S, less than or equal to 0.20% of microalloying elements (Nb+V+Ti+Ni), less than or equal to 0.050% of Als, and the balance of Fe and residual elements. By reasonably taking a chemical composition design on composite multicomponent microalloying elements and adopting an LF+VD (ladle refining + vacuum degassing)process, the purity of the steel plate is ensured, and the sum of levels of various inclusions is not more than 3.0; and by utilizing a thermo mechanical control process and adopting normalizing treatment, the grain fineness number of the steel plate reaches level 9.0-10.0; by means of the effective implementation of the measures, the extra-thick steel plates (thickness: greater than or equal to 100mm) for high-rise buildings with guaranteed flaw detection and mechanical properties are produced successfully.
Description
Technical field
The present invention relates to a kind of raising industry steel-making performance technologies field, particularly a kind of big thickness structure high-strength hardened and tempered steel plate and production method thereof.
Background technology
At present, the steel plate identical or close with high tensile steel plate performance and rank has application abroad, but is used for structures such as pressurized vessel, ocean platform and bridge, and large-scale application is not also arranged at home.The application at home of this kind steel relies on external import always, and domestic Wide and Thick Slab field did not produce, if import, not only price is expensive, and receipt period is long, can't guarantee normally carrying out of engineering.
Summary of the invention
The object of the present invention is to provide a kind of the have good obdurability coupling and big thickness structure the high-strength hardened and tempered steel plate and the production method thereof of anti-lamellar tearing ability.
A kind of big thickness structure is modulated steel plate with high strength, is made up of the chemical ingredients of following weight percentage: C≤0.20%, Si≤0.80%, Mn :≤1.70%, P≤0.025%, S≤0.015%, Ni≤2.00%, V≤0.12%, Nb≤0.06%, Ti≤0.05%, Cr :≤1.50%, Mo≤0.70%, B≤0.0050%, CEV≤0.83, all the other are Fe and other impurity.
The production method that above-mentioned big thickness structure is modulated steel plate with high strength, it may further comprise the steps:
A. smelt: 30t is contained the molten steel of above-mentioned each weight percent content chemical ingredients through converter smelting, send into the refining of LF refining furnace, and hello Al line 400m, bull ladle VD stove vacuum-treat during big bag temperature 〉=1600 ℃, add SiCa piece 80～120Kg before the vacuum, vacuum tightness is not more than 0.5 torr, destroys vacuum during vacuum hold-time 〉=20 minute, solve molten steel and depended merely on the deoxidation of Al line, the higher phenomenon of nonmetallic inclusionsin steel content, guaranteed the purity of steel;
B. casting: liquid steel temperature adopts 33t slab ingot mould to cast at 1545～1549 ℃ then after guaranteeing vacuum breaking, guarantees that big thickness, big substance steel plate have the enough draught and the raw material of becoming a useful person;
C. heating: occur bursting for avoiding the Hi-Stren steel ingot surface, steel ingot realizes that temperature is sent, Wen Qing, temperature dress, dried in the air stove more than 30 minutes before the dress steel, stewing steel 2.5 hours, tiny for guaranteeing the abundant solid solution of alloying element, r crystal grain, adopt low speed to burn steel, heat-up rate below 1000 ℃≤120 ℃/h, 1270 ℃ of maximum heating temperatures;
D. controlled rolling: adopt two stage controlled rolling process, the fs is the austenite recrystallization stage, between 950～1150 ℃, most of reductions in pass of this stage are 8～25%, accumulative total draft 〉=70% makes austenite generation perfect recrystallization, with refine austenite crystal grain; Subordinate phase is the non-recrystallize stage of austenite, start rolling temperature is≤920 ℃, finishing temperature is≤900 ℃, and in this stage, austenite crystal is elongated, form high-density mechanical twin and deformed belt in the austenite of non-recrystallization in elongation, simultaneously microalloy carbon, nitride are separated out because of deformation induced, thereby have increased ferritic nucleation site, refinement ferrite crystal grain, this stage draft should be tried one's best greatly, accumulative total draft 〉=50%;
E. control cold: the steel plate after rolling carries out online cooling at the ACC quickly cooling device, and returning red temperature is 650～700 ℃; Stacking slow cooling was 48 hours after steel plate rolled off the production line, and prevented that the steel plate internal stress from having little time to discharge and form internal fissure;
F. thermal treatment: steel plate is carried out modifier treatment, and the fiery temperature of quenching is 910 ± 10 ℃, and the time is incubated by 2.0min/mm, and shove charge is immediately carried out tempering for 650 ± 10 ℃ after the quenching, and the time is incubated by 4.5min/mm, and the air cooling of coming out of the stove gets final product.
The chemical composition design of steel plate of the present invention adopts low-carbon-equivalent, keep the martensite position to the sorbite steel, be by the design of low-carbon-equivalent composition and controlled rolling and controlled cooling+modified production technique, produce big thickness structure and modulate steel with high strength: the thick Q690D-Z35 steel plate of 110mm has good plasticity and toughness energy and anti-lamellar tearing performance.Use to strengthen and be actuated to build up, refined crystalline strengthening, precipitation strength and solution strengthening.C content is 0.14～0.17%, and main and other elements formation carbide of C play build up and precipitation strength, and armor plate strength is increased; The content of Mn is 1.10～1.25%, and Mn mainly plays solution strengthening and reduces transformation temperature, the effect that improves armor plate strength; Nb:0.03～0.04% in order effectively to realize steel plate crystallization reinforcement by controlled rolling process, must add the Nb element, and to improve steel plate recrystallization temperature, heating solid solution Nb prevention austenite crystal is grown up, and high temperature is separated out C, the Nization thing of Nb during cooling; V:0.05～0.06% is by after the controlled rolling of two stages, and the C of V, Nization thing are separated out, and improve the intensity of steel plate strongly; The main effect of Ni:1.00～1.20% is to increase austenitic condensate depression, thereby thinning microstructure is obtained strengthening effect, can also increase the atmospheric corrosion resistance ability of steel in addition, improves low-temperature impact toughness and reduces Cold Brittleness Transition Temperature; Impurity element P, S equal size lower limit do not limit, and reduce as far as possible under the processing unit ability, and steel is pure to reach, the uniform purpose of mechanical property.Condition of delivery of the present invention is modified, adopt controlled rolling and controlled cooling+hardening and tempering process to produce the thick Q690D-Z35 steel plate of 110mm through fully grain refining, higher speed of cooling obtained keeping the martensite position to the sorbite tissue, its performance index have good plasticity and toughness and anti-lamellar tearing ability, the production in the sector with use all beyond example still.
The present invention has the following advantages: (1) steel of the present invention is purer, P≤0.015%, S≤0.003%; (2) anti-lamellar tearing is functional, full thickness direction Z 〉=35%; (3)-20 ℃ low-temperature flexibility is good; (4) thickness of steel plate reaches 110mm.
Test-results shows: the steel plate that adopts method of the present invention to produce has that purity is higher, composition evenly, the characteristics of interior solid, the metallurgical level of steel is higher, and mechanical property satisfies GB/T16270-2009 and the GB/T5313-1985 standard-required to 110mmQ690D-Z35 fully.
Description of drawings
Fig. 1 is the metallograph of the surface layer of steel plate GD100926005-1-1;
Fig. 2 is the metallograph at 1/4 place of steel plate GD100926005-1-1;
Fig. 3 is the metallograph at 1/2 place of steel plate GD100926005-1-1;
Fig. 4 is the metallograph of the surface layer of steel plate GD100926005-1-2;
Fig. 5 is the metallograph at 1/4 place of steel plate GD100926005-1-2;
Fig. 6 is the metallograph at 1/2 place of steel plate GD100926005-1-2.
Embodiment
Embodiment:
(1) the modified structure iron Q690D-Z35 of high strength not only has higher requirements to temperature and low temperature (20 ℃) impelling strength, and requires to have good anti-lamellar tearing.According to GB/T 16270-2009 and GB/T5313-1985 composition and performance requriements, employing increases the intensity of steel with high carbon equivalent, with the hardening capacity of suitable alloying element (Nb, V, Ti, Cr, Mo, B) assurance steel, carried out the main component design, concrete composition sees Table 1.
Chemical Composition/the % (1510 ℃ of liquidus temperatures) of table 1:Q690D-Z35 steel
(2) technological process of production: molten iron (KR desulfurization) → converter (argon station) → LF refining → VD vacuum-treat → casting (33t, 44t ingot casting) → steel ingot demould time to after cold 8 hours of mould → cleaning (cleaning out in 8 hours) again → band temperature send roll-heat → de-scaling → 3800mm milling train → aligning → cooling in heap → outside inspection → flaw detection → thermal treatment → finishing → warehouse-in.Adopt LF, feed Si-Ca-Ba line and VD vacuum-treat, guarantee the cleanliness factor of steel.Heating guarantees the even austenitizing of steel ingot, and micro alloying elements such as Nb are fully dissolved, rolling employing two-stage controlled rolling, 1020～1150 ℃ of roughing start rolling temperatures, rough rolling step temperature＞1000 ℃, the steel thickness=finished product that dries in the air is thick+(70-100) mm, below roller-way is treated temperature or water-cooled to 920 ℃, beginning finish rolling stage rolling, draught is controlled at 8～15mm, 820 ± 20 ℃ of finishing temperatures.Roughing is rolling in the recrystallization zone, makes grain refining by deformation-recrystallize, thereby obtains less crystal grain after phase transformation.This in stage adopt high temperature, low speed, greatly depress rolling, the dendrite in the abundant broken steel ingot, deformation extent is big more, it is big more that forming core district density is closed the motivating force increase, crystal grain is just tiny more behind the recrystallize repeatedly.Finish rolling is rolling in the non-recrystallization district, adopts bigger accumulative total deflection, and austenite crystal fully is out of shape, at the more slip band of the inner formation of crystal grain, for ferritic transformation provides more nucleation site, crystal grain thinning.Rolling back is adopted and was carried out cooling in heap more than 350 ℃ 72 hours, modifier treatment after cooling in heap finishes, the quenching technology that adopts 920 ± 10 ℃ of heating, 2min/mm to be incubated, 650 ± 10 ℃ of heating, the tempering process of 4.5min/mm insulation.The band temperature and pressure are flat after the thermal treatment, and Performance Detection is done in the finishing sampling.
(2) results of property and metallographic result: results of property sees Table 2, and metallographic the results are shown in Table 3.
The results of property of table 2:Q690D-Z35 steel
The metallographic result of table 3:Q690D-Z35 steel
Q690D-Z35 steel plate according to this process exploitation, the steel plate yield strength reaches 785～870MPa, tensile strength reaches 824～920MPa, elongation reaches more than 16%,-20 ℃ of ballistic works reach more than the 103J, greater than 25%, flaw detection reaches 1 grade of flaw detection requirement to Z, has realized the combination of intensity and flexible matched well and higher internal soundness to relative reduction in area.
Enforcement recited above is the unrestricted technical scheme of the present invention in order to explanation only, under the prerequisite that does not break away from design philosophy of the present invention, the any modification or partial replacement that those skilled in the art make the technical program all should be encompassed in the middle of the claim scope of the present invention.
Claims (3)
1. big thickness structure high-strength hardened and tempered steel plate, it is characterized in that: comprise following chemical components in mass percent, C: Si≤0.19% :≤0.50%, Mn:1.00～1.60%, P: S≤0.015%: micro alloying element (Nb+V+Ti+Ni)≤0.003%: Als≤0.20% :≤0.050%, other is Fe and relict element.
2. a big thickness structure high-strength hardened and tempered steel plate is characterized in that: carbon equivalent [Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15] :≤0.47.
3. big thickness structure as claimed in claim 1 is characterized in that with the production method of high-strength hardened and tempered steel plate it comprises the steps:
Converter smelting: control tapping carbon 〉=0.06%, tapping P≤0.012%, S≤0.012% by Clean Steel smelting technology standard; Point blows number of times and must not avoid slag under the tapping process greater than 2 times;
The LF refining: take the big quantity of slag to carry out slag making, really how the white slag hold-time is controlled at more than the 15min; Stop the rare phenomenon of slag; Carry out the Argon operation in strict accordance with the Argon standard, forbid blowing cruelly;
Vacuum refinement: the dwell time under≤67Pa is controlled by 〉=20min; Carry out Ca behind the vacuum breaker immediately and handle, inclusion is carried out modification, soft blow is hung steel after greater than 5min;
Cast: adhere to " high temperature is annotated slowly, and low temperature is annotated soon " principle;
The steel rolling heating: the steel ingot heating is undertaken by 36 water cooled mo(u)ld ingot casting low-alloy series heating process, fully grills thoroughly, burns evenly to guarantee steel; The holding temperature of dead soaking pit is according to 1250 ℃～1260 ℃ execution;
Rolling: adopt two stage rolling, 1050 ℃～1150 ℃ of stage start rolling temperatures, the rolling requirement of " high temperature, low speed, depress greatly " is adhered in strictness, for guaranteeing the distortion infiltration, when thickness of slab 〉=500mm, reduction in pass is by 60 ± 10mm control, and working roll rolling line speed is by≤1.5m/s control; Cool steel thickness is 160-200mm, and the two-stage start rolling temperature is at 820～860 ℃, and the two-stage takes to depress for a short time rolling, and reduction in pass is 15-20mm, finishing temperature 800-840 ℃;
Control cold: it is weak cold to enter twice of ACC after rolling, reduces the surface and the inner temperature difference as far as possible, guarantees to return red temperature at 620-660 ℃, is sent to powerful straightener after the cooling and carries out hot straightening;
Slow cooling: carry out slow cooling after steel plate rolls off the production line, go into burial pit temperature 〉=500 ℃; Cooling in heap time 〉=48 hour;
Thermal treatment: carrying out technology is 910 ± 10 ℃ of holding temperatures, during insulation 1.8mim/mm+1.5 hour, and the steel plate back water-cooled 40-50S that comes out of the stove.
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| CN115652219B (en) * | 2022-10-21 | 2023-11-21 | 舞阳钢铁有限责任公司 | Low-cost low-temperature structural steel with excellent cold forming characteristics and production method thereof |
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Application publication date: 20110601 |