CN101876032B - Weather-resistance bridge high-strength steel plate and production method thereof - Google Patents
Weather-resistance bridge high-strength steel plate and production method thereof Download PDFInfo
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- 229910052799 carbon Inorganic materials 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 10
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 9
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 8
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- 238000004512 die casting Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims 1
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Abstract
The invention discloses a weather-resistance bridge high-strength steel plate and a production method thereof. The weather-resistance bridge high-strength steel plate is prepared from the following components in percentage by weight: less than or equal to 0.11 percent of C, 0.30 to 0.50 percent of Si, 1.10 to 1.35 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.006 percent of S, 0.25 to 0.40 percent of Ni, 0.04 to 0.08 percent of V, 0.025 to 0.045 percent of Nb, 0.010 to 0.040 percent of Alt, 0.45 to 0.70 percent of Cr, 0.25 to 0.40 percent of Cu, 0.02 to 0.08percent of Mo, 0.015 to 0.025 percent of Ti, less than or equal to 0.015 percent of N and the balance of Fe and inevitable impurities. The invention also relates to a production method of the weather-resistance bridge high-strength steel plate. The steel plate has excellent obdurability matching, high yield strength, high weather resistance and high cold-workability. The steel quality is purer, and the maximum thickness of the steel plate is up to 90 millimeters. The weather-resistance bridge high-strength steel plate is mainly used for manufacturing ocean platform and large sea-crossing bridge structural parts.
Description
Technical field
The present invention relates to a kind of Weather-resistance bridge high-strength steel plate, also relate to a kind of working method of this high tensile steel plate simultaneously.
Background technology
Weather-resistance bridge high-strength steel plate is a kind of corrosion-resistant and high-intensity steel plate that has simultaneously; Thickness is generally below 100mm; For some ocean platforms and large-scale river, the Oversea bridge of striding; Require it to have certain thickness, but also require this type of steel plate to have forming property and welding property preferably, could satisfy the demand of bridge construction.Weather-resistance bridge high-strength steel plate commonly used at present adopts A709M-HPS485W, A709SL485; The at present domestic production (use) of the Weather-resistance bridge high-strength steel plate of this big thickness; Main dependence on import, cost is higher, and at the ocean platform or the large-scale Oversea bridge construction process of reality; To having relatively high expectations of steel plate, general weather-resistant steel plate can not be satisfied the demand.
Summary of the invention
The Weather-resistance bridge high-strength steel plate that the purpose of this invention is to provide a kind of good weatherability, intensity height and excellent cold-workability exhibiting.
Another object of the present invention provides the working method of the thick weathering resistance high tensile steel plate of a kind of 8-90mm, to realize steel plate excellent cold-workability exhibiting, good weatherability, the purpose that intensity is high.
In order to realize above purpose, Weather-resistance bridge high-strength steel plate of the present invention is to be prepared from following components in weight percentage: C≤0.11%, Si 0.30-0.50%, Mn 1.10-1.35%; P≤0.020%, S≤0.006%, Ni0.25-0.40%; V 0.0-40.08%, Nb 0.025-0.045%, Alt 0.010-0.040%; Cr 0.45-0.70%, Cu0.25-0.40%, Mo0.02-0.08%; Ti 0.015-0.025%, N≤0.015%, all the other are Fe and unavoidable impurities.
Weather-resistance bridge high-strength steel plate preferred version of the present invention is to be prepared from following components in weight percentage: C0.08-0.11%, Si 0.30-0.50%, Mn 1.20-1.35%, P≤0.015%; S≤0.006%, Ni 0.30-0.40%, V0.05-0.07%, Nb 0.025-0.045%; Alt 0.010-0.040%, Cr 0.50-0.65%, Cu 0.25-0.40%; Mo0.02-0.08%, N≤0.010%, all the other are Fe and unavoidable impurities.
The thickness of Weather-resistance bridge high-strength steel plate of the present invention is 8-90mm.
The preparation method of Weather-resistance bridge high-strength steel plate of the present invention, the thickness of steel plate is 8-90mm, comprises the steps:
(1) smelting technology: the molten steel that will contain above-mentioned each element is sent into the refining of LF refining furnace earlier through electrosmelting, and feeds the Al line; Change vacuum degassing furnace (VD stove) vacuum-treat over to during 1580-1600 ℃ of big bag temperature, add the CaSi piece before the vacuum, nodularization is mingled with; Vacuum tightness is not more than 66Pa; Destroy vacuum during 20-25 minute vacuum hold-time, solved molten steel and depended merely on the deoxidation of Al line, the higher phenomenon of nonmetallic inclusionsin steel content, guaranteed the purity of steel;
(2) casting process: steel plate thick more than the 70mm adopts die casting production, and superheating temperature is 25-40 ℃, adopts 21.35T-28.3T slab ingot mould to cast, and guarantees that big thickness, big substance steel plate have the enough draught and the raw material of becoming a useful person; The steel plate thick less than 70mm adopts continuous casting production, and throwing speed is 1.05-1.2m/min, and guarantees throwing speed and secondary cooling water coupling;
(3) heating process: occur bursting for fear of HSLA ingot (base) surface; Steel billet, steel ingot realize that temperature is sent, Wen Qing, temperature dress, guarantee that the temperature of furnace temperature and steel ingot (base) is basic identical, make the abundant solid solution of alloying element, r crystal grain tiny; Adopt low speed to burn steel; Heat-up rate 100-120 below 1000 ℃ ℃/h, maximum heating temperature 1240-1260 ℃, be incubated 100-400min then;
(4) rolling technology: adopt II type controlled rolling process, the fs is the austenite recrystallization stage, and start rolling temperature is 990-1150 ℃, and finishing temperature is 950-970 ℃, and accumulative total draft 70-90% makes austenite generation perfect recrystallization, with refine austenite crystal grain; Subordinate phase is the non-recrystallize stage of austenite, and start rolling temperature is 860-880 ℃, and finishing temperature is 800-820 ℃; In this stage, austenite crystal is elongated, and forms 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 50-70%; Said single pass draft is 8-25%;
(5) water-cooling process: the steel plate after rolling cools off through the ACC quickly cooling device, and returning red temperature is 650-700 ℃; 70mm also needs stacking cooling 24-30 hour with upper steel plate;
(6) quenching technology: steel plate is carried out quench treatment, and wherein quenching temperature is 930 ± 10 ℃ and under this temperature, is incubated 20min; Roller speed 2 ~ 18m/min, cooling water inflow is whole with the roller velocity modulation, and is as shown in table 1:
Table 1
| Thickness (mm) | Cooling roller speed (m/min) | Thickness (mm) | Cooling roller speed (m/min) |
| 8-16 | 18 | 22 | 16 |
| 25 | 14 | 30 | 12 |
| 35 | 10 | 40 | 8 |
| 45 | 6 | 50 | 4 |
| 55 | 4 | 60 | 3 |
| 65 | 3 | 70-90 | 2 |
(7) tempering process: the steel plate to after quenching carries out tempering, tempering temperature 610-690 ℃, soaking time 4.0min/mm-4.5min/mm.
The chemical composition design of steel plate of the present invention adopts low-carbon-equivalent; Mn-Ni-Cr-Cu-Nb-V-Ti is the tempered sorbite steel; Be through the design of low-carbon-equivalent composition and controlled rolling and controlled cooling+modified production technique; Produce meet the thick high-performance weather-proof bridge of 8-90mm with high-strength steel require steel plate (Ceq≤0.50%, I>=6.0), be applied to the Oversea bridge steel construction piece and make, have characteristics such as HS, good welding property, anti-lamellar tearing performance and weather resistance; Satisfy the requirements such as welding at the on-the-spot crucial stressed place of Oversea bridge steelwork, its manufacture operation simple, can realize producing in batches.The strengthening mechanism of using is build up, refined crystalline strengthening, precipitation strength and solution strengthening.
In the component of Weather-resistance bridge high-strength steel plate of the present invention: main and other elements formation carbide of C, play build up and precipitation strength, armor plate strength is increased; As reductive agent and reductor, combinations such as silicon and molybdenum, chromium have the erosion resistance of raising and oxidation resistant effect to Si, surpass at 0.5% o'clock in steelmaking process, can cause the toughness of steel to descend, and reduce the welding property of steel; Mn mainly plays solution strengthening and reduces transformation temperature, the effect that improves armor plate strength; In order effectively to realize steel plate crystallization reinforcement through controlled rolling process, must add the Nb element, to reach the raising steel plate recrystallization temperature, heating solid solution Nb stops austenite crystal to be grown up, and high temperature is separated out C, the Nization thing of Nb during cooling; It is after the controlled rolling of process II type that V mainly acts on, and separates out C, Nization thing, improves steel plate strongly and gets intensity; Ti can solidify the N element in steel, tiny TiN particle can hinder the austenite crystal of steel when heating effectively and grow up, and can improve the welding property of steel significantly; It is to increase austenitic condensate depression that Ni mainly acts on, thereby thinning microstructure is obtained strengthening effect; Can also increase the atmospheric corrosion resistance ability of steel in addition, improve low-temperature impact toughness and reduce Cold Brittleness Transition Temperature; Cr can improve hardening capacity and solution strengthening in steel plate, can improve intensity and the hardness of steel under as-heat-treated condition; Cu can obviously improve the erosion resistance of steel plate, improves intensity simultaneously; Mo can significantly improve the hardening capacity of steel, can improve temper resistance simultaneously, and the content of strict here control Mo can cause the welding property of steel plate to descend if the content of Mo is excessive; Al can improve the intensity and the hardness of steel plate; Impurity element P, S equal size roll off the production line and do not limit, and under the processing unit ability, reduce as far as possible, and steel is pure to reach, the uniform purpose of mechanical property.
Dilivery state of the present invention is modified; The thick Weather-resistance bridge high-strength steel plate of the 8-90mm that adopts hardening and tempering process to produce is through abundant grain refining; Martensite or bainite under bigger speed of cooling, have been obtained; Through behind the suitable tempering process, its performance index obviously are better than independent controlled rolling steel, the Weather-resistance bridge high-strength steel plate of the thick 485MPa level of 8-90mm that hardening and tempering process is produced.Owing to adopt II type controlled rolling process; Being divided into two stages is rolled respectively; The thick inequality of crystal grain that has solved the mill milling insufficient pressure and caused, impelling strength lower phenomenon; And increased the thickness specification that to produce steel plate, be fit to the low rolling pressure milling train production controlled rolling type high-strength steel of other steel mill.
The present invention has the following advantages: (1) obdurability coupling is good, ys Re>=485Mpa, and ys every raising 70MPa on the 485Mpa basis, and impact test temperature reduces by 8 ℃; (2) weather resistance is good, corrosion resistance index I>=6.0; (3) steel of the present invention is purer, P≤0.020%, S≤0.006%; (4) anti-lamellar tearing is functional, full thickness direction extensibility Z>=20%; (5) carbon equivalent is low, and carbon equivalent is 0.45-0.50%, good welding performance; (6) the steel plate maximum ga(u)ge can reach 90mm.
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 the standard-required (USS ASTM A709) of the new Transbay Bridge of san francisco, usa to the thick A709M-HPS485W of 10-90mm, A709SL485 fully.Composition is pressed the design of low-carbon-equivalent steel; Has good obdurability coupling; Carbon equivalent Ceq≤0.50%, welding cold cracking sensitivity coefficient Pcm≤0.27%, corrosion resistance nature I>=6.0; The welding qualification test shows that the thick Weather-resistance bridge of 8-90mm of the present invention has lower welding crack sensibility index with steel plate, is suitable for making large-scale Oversea bridge structural part.
Embodiment
Embodiment 1
The Weather-resistance bridge high-strength steel plate of present embodiment is to be prepared from following components in weight percentage: C 0.09%, Si0.35%, Mn 1.20%, P 0.012%, S 0.003%, Alt 0.030%, Nb 0.028%, V 0.050%, Ni0.30%, Cr 0.50%, Mo 0.04%, Cu 0.28%, Ti 0.018%; N 0.005%, and all the other are Fe and unavoidable impurities.The steel plate thickness of present embodiment is 90mm.
The working method of Weather-resistance bridge high-strength steel plate of the present invention is following:
(1) smelting technology: the molten steel that will contain above-mentioned each element is earlier through electrosmelting; Send into the refining of LF refining furnace and adjust composition; And feed the Al line, and change vacuum degassing furnace (VD stove) vacuum-treat over to during 1580 ℃ of temperature, add the CaSi piece before the vacuum; Vacuum tightness is not more than 66Pa, destroys vacuum during 20 minutes vacuum hold-times;
(2) casting process: adopt die casting production, superheating temperature is 25 ℃, adopts 28.30T slab ingot mould to cast, and guarantees that big thickness, big substance steel plate have the enough draught and the raw material of becoming a useful person;
(3) heating process: occur bursting for fear of the HSLA ingot surface; Steel ingot realizes that temperature is sent, Wen Qing, temperature dress, guarantees that furnace temperature and steel ingot temperature are basic identical, makes the abundant solid solution of alloying element, r crystal grain tiny; Adopt low speed to burn steel; 120 ℃/h of heat-up rate below 1000 ℃, 1250 ℃ of maximum heating temperatures are incubated 400min then;
(4) rolling technology: adopt II type controlled rolling process, the fs is the austenite recrystallization stage, and start rolling temperature is 1150 ℃, and finishing temperature is 970 ℃, and this stage accumulative total draft 70% makes austenite generation perfect recrystallization, with refine austenite crystal grain; Subordinate phase is the non-recrystallize stage of austenite, and start rolling temperature is 880 ℃, and finishing temperature is 810 ℃; In this stage, austenite crystal is elongated, and forms high-density mechanical twin and deformed belt in the austenite of non-recrystallization in elongation; Microalloy carbon, nitride are separated out because of deformation induced simultaneously; Increased ferritic nucleation site, refinement ferrite crystal grain, this accumulative total draft 50% in stage; The draught of said single pass is 8-25%;
(5) water-cooling process: the steel plate after rolling cools off through the ACC quickly cooling device, and returning red temperature is 650 ℃; The stacking cooling is 30 hours then, prevents that the steel plate internal stress from having little time to discharge and the formation internal fissure;
(6) quenching technology: steel plate is carried out quench treatment, and wherein quenching temperature is 930 ℃ and under this temperature, is incubated 20min; Cooling roller speed 2m/min.
(7) tempering process: the steel plate to after quenching carries out tempering, and wherein tempering temperature is 610 ℃, soaking time 4.5min/mm, air cooling after the tempering.
The performance of the Weather-resistance bridge high-strength steel plate of present embodiment is following: Ceq is 0.46%, and I >=6.0 roll into the 90mm steel plate.Its mechanical property: ys 530MPa, tensile strength 645MPa, yield tensile ratio=0.82, extensibility A=27% ,-23 ℃ of ballistic work AKV (vertically) 103,136,127J, Z=45.48%.
Embodiment 2
The Weather-resistance bridge high-strength steel plate of present embodiment is to be prepared from following components in weight percentage: C 0.10%, Si0.40%, Mn 1.18%, P 0.010%, S 0.002%, Alt 0.025%, Nb 0.025%, V 0.040%, Ni 0.35%, Cr 0.55%, Mo 0.05%, Cu 0.25%, Ti 0.015%; N 0.0048%, and all the other are Fe and unavoidable impurities.The steel plate thickness of present embodiment is 75mm.
The working method of Weather-resistance bridge high-strength steel plate of the present invention is following:
(1) smelting technology: the molten steel that will contain above-mentioned each element is earlier through electrosmelting; Send into the refining of LF refining furnace and adjust composition; And feed the Al line, vacuum degassing furnace (VD stove) vacuum-treat adds the CaSi piece during 1580 ℃ of temperature before the vacuum; Vacuum tightness is not more than 66Pa, destroys vacuum during 20 minutes vacuum hold-times;
(2) casting process: adopt die casting process production, superheating temperature is 40 ℃, adopts 21.35T slab ingot mould to cast, and guarantees that big thickness, big substance steel plate have the enough draught and the raw material of becoming a useful person;
(3) heating process: steel ingot adopts that temperature is sent, Wen Qing, temperature dress, guarantees that furnace temperature and steel ingot temperature are basic identical, makes the abundant solid solution of alloying element, r crystal grain tiny; Adopt low speed to burn steel; 110 ℃/h of heat-up rate below 1000 ℃, 1240 ℃ of maximum heating temperatures are incubated 280min then;
(4) rolling technology: adopt II type controlled rolling process, the fs is the austenite recrystallization stage, and start rolling temperature is 1100 ℃, and finishing temperature is 960 ℃, and this stage accumulative total draft 80% makes austenite generation perfect recrystallization, with refine austenite crystal grain; Subordinate phase is the non-recrystallize stage of austenite, and start rolling temperature is 860 ℃, and finishing temperature is 820 ℃; In this stage, austenite crystal is elongated, and forms high-density mechanical twin and deformed belt in the austenite of non-recrystallization in elongation; Microalloy carbon, nitride are separated out because of deformation induced simultaneously; Thereby increased ferritic nucleation site, refinement ferrite crystal grain, this stage accumulative total draft 60%; The draught of said single pass is 8-25%;
(5) water-cooling process: the steel plate after rolling carries out online cooling through the ACC quickly cooling device, and returning red temperature is 680 ℃, and the stacking cooling is 24 hours then;
(6) quenching technology: steel plate is carried out quench treatment, and wherein quenching temperature is 920 ℃ and under this temperature, is incubated 20min; Cooling roller speed 2m/min.
(7) tempering process: the steel plate to after quenching carries out tempering, 630 ℃ of tempering temperatures, soaking time 4.5min/mm.
The performance of the Weather-resistance bridge high-strength steel plate of present embodiment is following: Ceq is 0.47%, and I >=6.0 roll into the 75mm steel plate.Its mechanical property: ys 545MPa, tensile strength: 660MPa, yield tensile ratio=0.83, A=31% ,-23 ℃ of ballistic work AKV (vertically) 153,148,146J, Z to: 53.50%.
Embodiment 3
The Weather-resistance bridge high-strength steel plate of present embodiment is to be prepared from following components in weight percentage: C 0.11%, Si0.30%, Mn 1.1%, P 0.011%, S 0.002%, Alt 0.040%, Nb 0.037%, V 0.080%, Ni 0.25%, Cr0.45%, Mo0.08%, Cu0.33%, Ti0.022%; N 0.0045%, and all the other are Fe and unavoidable impurities.The steel plate thickness of present embodiment is 10mm.
The working method of Weather-resistance bridge high-strength steel plate of the present invention is following:
(1) smelting technology: the molten steel that will contain above-mentioned each element is earlier through electrosmelting; Send into the refining of LF refining furnace and adjust composition; And feed the Al line, and change vacuum degassing furnace (VD stove) vacuum-treat over to during 1590 ℃ of temperature, add the CaSi piece before the vacuum; Vacuum tightness is not more than 66Pa, destroys vacuum during vacuum hold-time 22min;
(2) casting process: adopt continuous casting process production, throwing speed is 1.05m/min, and guarantees throwing speed and secondary cooling water coupling;
(3) heating process: steel billet adopts that temperature is sent, Wen Qing, temperature dress, guarantees that heat temperature raising speed is basicly stable, makes the abundant solid solution of alloying element, r crystal grain tiny; Adopt low speed to burn steel; 100 ℃/h of heat-up rate below 1000 ℃, 1255 ℃ of maximum heating temperatures are incubated 200min then;
(4) rolling technology: adopt II type controlled rolling process, the fs is the austenite recrystallization stage, and start rolling temperature is 1000 ℃, and finishing temperature is 970 ℃, and this stage accumulative total draft 70% makes austenite generation perfect recrystallization, with refine austenite crystal grain; Subordinate phase is the non-recrystallize stage of austenite, and start rolling temperature is 870 ℃, and finishing temperature is 820 ℃; In this stage, austenite crystal is elongated, and forms high-density mechanical twin and deformed belt in the austenite of non-recrystallization in elongation; Microalloy carbon, nitride are separated out because of deformation induced simultaneously; Thereby increased ferritic nucleation site, refinement ferrite crystal grain, this stage accumulative total draft 50%; The draught of said single pass is 8-25%;
(5) water-cooling process: the steel plate after rolling carries out online cooling through the ACC quickly cooling device, and returning red temperature is 670 ℃;
(6) quenching technology: steel plate is carried out quench treatment, and wherein quenching temperature is 940 ℃ and under this temperature, is incubated 20min; Cooling roller speed 18m/min.
(7) tempering process: the steel plate to after quenching carries out tempering, and is different according to thickness of slab, 690 ℃ of tempering temperatures, soaking time 4min/mm.
The performance of the Weather-resistance bridge high-strength steel plate of present embodiment is following: Ceq is 0.47%, and I >=6.0 roll into the 10mm steel plate.Its mechanical property: ys 550MPa, tensile strength: 670MPa, yield tensile ratio=0.82, A=35% ,-23 ℃ of ballistic work AKV (vertically) 242,258,246J, Z to: 48.25%.
Embodiment 4
The Weather-resistance bridge high-strength steel plate of present embodiment is to be prepared from following components in weight percentage: C 0.08%, Si0.50%, Mn 1.35%, P 0.009%, S 0.003%, Alt 0.010%, Nb 0.045%, V 0.070%, Ni 0.40%, Cr 0.65%, Mo 0.02%, Cu 0.40%, Ti 0.025%; N 0.0050%, and all the other are Fe and unavoidable impurities.The steel plate thickness of present embodiment is 45mm.
The working method of Weather-resistance bridge high-strength steel plate of the present invention is following:
(1) smelting technology: the molten steel that will contain above-mentioned each element is earlier through electrosmelting; Send into the refining of LF refining furnace and adjust composition; And feed the Al line, vacuum degassing furnace (VD stove) vacuum-treat adds the CaSi piece during 1600 ℃ of temperature before the vacuum; Vacuum tightness is not more than 66Pa, destroys vacuum during vacuum hold-time 25min;
(2) casting process: adopt continuous casting process production, throwing speed is 1.2m/min, and guarantees throwing speed and secondary cooling water coupling;
(3) heating process: steel billet adopts that temperature is sent, Wen Qing, temperature dress, guarantees that furnace temperature and steel billet temperature are basic identical, makes the abundant solid solution of alloying element, r crystal grain tiny; Adopt low speed to burn steel; 110 ℃/h of heat-up rate below 1000 ℃, 1260 ℃ of maximum heating temperatures are incubated 100min then;
(4) rolling technology: adopt II type controlled rolling process, the fs is the austenite recrystallization stage, and start rolling temperature is 990 ℃, and finishing temperature is 950 ℃, and this stage accumulative total draft 90% makes austenite generation perfect recrystallization, with refine austenite crystal grain; Subordinate phase is the non-recrystallize stage of austenite, and start rolling temperature is 880 ℃, and finishing temperature is 800 ℃; In this stage, austenite crystal is elongated, and forms high-density mechanical twin and deformed belt in the austenite of non-recrystallization in elongation; Microalloy carbon, nitride are separated out because of deformation induced simultaneously; Thereby increased ferritic nucleation site, refinement ferrite crystal grain, this stage accumulative total draft 70%; The draught of said single pass is 8-25%;
(5) water-cooling process: the steel plate after rolling carries out online cooling through the ACC quickly cooling device, and returning red temperature is 700 ℃;
(6) quenching technology: steel plate is carried out quench treatment, and wherein quenching temperature is 930 ℃ and under this temperature, is incubated 20min; Cooling roller speed 6m/min.
(7) tempering process: the steel plate to after quenching carries out tempering, and is different according to thickness of slab, 670 ℃ of tempering temperatures, soaking time 4.5min/mm.
The performance of the Weather-resistance bridge high-strength steel plate of present embodiment is following: Ceq is 0.50%, and I >=6.0 roll into the 45mm steel plate.Its mechanical property: ys 550MPa, tensile strength: 685MPa, yield tensile ratio=0.80, A=29% ,-23 ℃ of ballistic work AKV (vertically) 188,226,209J, Z to: 45.38%.
Adopt GB6803-86 to carry out nil-ductility temperature ram's horn test NDT temperature to the steel plate among the foregoing description 1-4 and be-55 ℃; This steel plate is carried out weldability test; The welding down of conventional welding heat input normal temperature; It is 190-250HV (Vickers' hardness) that the heat affected zone reaches near position, heat affected zone hardness, is not more than 350HV; These steel are when the wlding coupling of selecting for use, and welding steel does not all need preheating under the normal temperature, does not produce welding crack, and need not heat-treat after the welding.
Claims (8)
1. the working method of a Weather-resistance bridge high-strength steel plate, it is characterized in that: the thickness of steel plate is 8-90mm, is to be prepared from following components in weight percentage: C≤0.11%, Si 0.30-0.50%; Mn 1.10-1.35%, P≤0.020%, S≤0.006%, Ni 0.25-0.40%; V 0.04-0.08%, Nb 0.025-0.045%, Alt 0.010-0.040%; Cr 0.45-0.70%, Cu 0.25-0.40%, Mo 0.02-0.08%; Ti 0.015-0.025%, N≤0.015%, all the other are Fe and unavoidable impurities;
This method comprises the steps:
(1) smelting technology: the molten steel that will contain each element is sent into the refining of LF refining furnace and is adjusted composition earlier through electrosmelting, when liquid steel temperature reaches 1580-1600 ℃, changes vacuum degassing furnace (VD stove) vacuum-treat over to;
(2) casting process: the molten steel after will smelting is cast;
(3) heating process: adopt low speed to burn steel, heat-up rate 100-120 below 1000 ℃ ℃/h, maximum heating temperature 1240-1260 ℃, be incubated 100-400min then;
(4) rolling technology: the fs is the austenite recrystallization stage, and rolling temperature is 950-1150 ℃, accumulative total draft 70-90%; Subordinate phase is the non-recrystallize stage of austenite, and rolling temperature is 800-900 ℃, accumulative total draft 50-70%;
(5) water-cooling process: the steel plate after rolling cools off fast, and returning red temperature is 650-700 ℃; 70mm also needs stacking cooling 24-30 hour with upper steel plate;
(6) quenching technology: steel plate is carried out quench treatment, and wherein quenching temperature is 920-940 ℃ and under this temperature, is incubated 20min, and cooling roller speed is 2-18m/min;
(7) tempering process: the steel plate to after quenching carries out tempering, tempering temperature 610-690 ℃, soaking time 4min/mm-4.5min/mm, air cooling after the tempering.
2. working method according to claim 1 is characterized in that: add Al line and CaSi piece before the said vacuum-treat of step 1).
3. working method according to claim 1 is characterized in that: the described vacuum treated vacuum tightness of step 1) is not more than 66Pa, 20-25 minute vacuum hold-time.
4. working method according to claim 1 is characterized in that: step 2) in the described casting, adopt die casting production for steel plate thick more than the 70mm, superheating temperature is 25-40 ℃, adopts 21.35T-28.3T slab ingot mould to cast; For adopting continuous casting production less than the thick steel plate of 70mm, throwing speed is 1.05-1.2m/min.
5. working method according to claim 1 is characterized in that: step 4) said rolling in, the start rolling temperature 990-1150 of fs ℃, finishing temperature 950-970 ℃; The start rolling temperature 860-880 of subordinate phase ℃, finishing temperature 800-820 ℃.
6. according to claim 1 or 5 described working methods, it is characterized in that: the draft of the said rolling middle single pass of step 4) is 8-25%.
7. prepared Weather-resistance bridge high-strength steel plate of the working method by said claim 1.
8. Weather-resistance bridge high-strength steel plate according to claim 7 is characterized in that: be to be prepared from following components in weight percentage: C 0.08-0.11%, Si 0.30-0.50%, Mn 1.20-1.35%; P≤0.015%, S≤0.006%, Ni 0.30-0.40%; V 0.05-0.07%, Nb 0.025-0.045%, Alt 0.010-0.040%; Cr 0.50-0.65%, Cu 0.25-0.40%, Mo 0.02-0.08%; Ti 0.015-0.025%, N≤0.010%, all the other are Fe and unavoidable impurities.
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