CN105838996A - 800MPa-grade high-strength and weather-proof steel plate and production method thereof - Google Patents

800MPa-grade high-strength and weather-proof steel plate and production method thereof Download PDF

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Publication number
CN105838996A
CN105838996A CN201610285086.6A CN201610285086A CN105838996A CN 105838996 A CN105838996 A CN 105838996A CN 201610285086 A CN201610285086 A CN 201610285086A CN 105838996 A CN105838996 A CN 105838996A
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strength
steel plate
production method
percent
weather
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Inventor
谷辉格
张大伟
包阔
陈超
徐立山
高玲玲
程玉君
薛启河
王伟
乔俊
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Hebei Iron and Steel Co Ltd
Hebei Iron and Steel Group Co Ltd Chengde Branch
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Hebei Iron and Steel Group Co Ltd Chengde Branch
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226Hot rolling
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/001Ferrous alloys, e.g. steel alloys containing N
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/002Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/14Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/005Ferrite
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/009Pearlite

Abstract

The invention discloses an 800MPa-grade high-strength and weather-proof steel plate and a production method thereof. The high-strength and weather-proof steel plate comprises the following chemical components in percentages by weight: not more than 0.12 percent of C, not more than 0.40 percent of Si, 1.60 to 2.00 percent of Mn, not more than 0.025 percent of P, not more than 0.010 percent of S, 0.10 to 0.40 percent of Nb, V and Ti, 0.10 to 0.45 percent of Mo, 0.015 to 0.050 percent of Als, not more than 0.008 percent of N and the balance Fe and unavoidable impurity elements. The production method comprises the working procedures of converter smelting, LF (ladle furnace) refining, plate blank continuous casting, plate blank heating, high-pressure-water scale removal, controlled rolling and controlled cooling. According to a hot-rolled coil plate produced by the invention, the strength of steel is improved by utilizing the comprehensive strengthening effect of multiple elements; the delayed fracture and the corrosion resistance of the steel are improved by adding the element Mo; the high-strength and weather-proof steel plate of which the tensile strength is not less than 900MPa, the yield strength is not less than 800Mpa and the elongation rate is not less than 18 percent is obtained; the industrialized production is realized.

Description

A kind of 800MPa grade high-strength weathering steel plate and production method thereof
Technical field
The invention belongs to metallurgical technology field, be specifically related to a kind of 800MPa grade high-strength weathering steel plate and production method thereof.
Background technology
From 20 beginnings of the century so far, various countries of virtue Britain and Japan have just carried out a large amount of in-depth study to weathering steel.The weathering steel produced in Europe at present is mainly Cu-P-Cr-Ni system or Cu-Cr-Ni system, yield strength substantially 500MPa, 550MPa, 600MPa, 650MPa and 700MPa, is up to 600MPa for container weathering steel tensile strength.China's research in terms of weathering steel starts from the sixties in 20th century the earliest, weathering steel with 09CuPTiRE, 09CuPCrNi, 09CuPVRE as representative, and defined mass production capabilities, these steel are based on Cu, P and add the element such as rare earth element and V, Ti, yield strength is 245MPa, 345MPa, and tensile strength is up to 550MPa.
The weathering steel that the present invention is developed mainly uses niobium, vanadium, titanium to be combined the micro alloyed steel component system of interpolation, utilizes the multiple strengthening effect of multiple element to improve the intensity of steel, and adds Mo element and improve the delayed fracture of steel and decay resistance.Use higher billet heating temperature and relatively low coiling temperature, and strictly control course of hot rolling parameter and produce that hot rolling yield strength reaches 800MPa, tensile strength is up to 900MPa level weathering steel, be a kind of high-strength weathering steel plate that intensity rank is higher on the market at present.Due to hot-rolled production process feature, each rolling parameter fluctuates within the specific limits, causes strengthening finished product microstructure and strength control difficulty, therefore finds optimal heat roll process to control parameter in the operation of rolling, will be the key content studied of the present invention.
Summary of the invention
The present invention provides a kind of 800MPa grade high-strength weathering steel and production method thereof.Niobium, vanadium, titanium is used to be combined the micro alloyed steel component system of interpolation, based on precipitation strength, it is aided with phase transformation strengthening and refined crystalline strengthening, by micro alloying element solid solution, segregation and precipitation in steel, low resistance of deformation when achieving rolling and the high intensity of product, have good forming property, low temperature impact properties and weather resistance simultaneously.
An object of the present invention is to provide a kind of 800MPa grade high-strength weathering steel and production method, described weather-resistant steel plate chemical composition and percentage by weight thereof are as follows: C≤0.12%, Si≤0.40%, Mn:1.60~2.00%, P≤0.025%, S≤0.010%, Nb+V+Ti:0.10~0.40%, Mo:0.10~0.45%, Als:0.015~0.050%, N≤0.008%, surplus is Fe and inevitable impurity element.
Weather-resistant steel plate performance indications of the present invention are as follows: tensile strength >=900MPa, yield strength >=800MPa, elongation percentage >=18%.
Weather-resistant steel plate of the present invention is organized as ferrite and adds pearlite, and its medium pearlite accounts for 10~16%.
It is a further object of the present invention to provide the production method of above-mentioned a kind of 800MPa grade high-strength weathering steel, including following operation: converter smelting, LF refine, sheet billet continuous casting, heating of plate blank, high-pressure water descaling, controlled rolling, control cooling.
Converter smelting of the present invention obtains slab according to set component smelting molten steel, molten steel LF refine, sheet billet continuous casting operation.
Heating of plate blank operation of the present invention is by heating of plate blank to 1220~1300 DEG C.
Controlled rolling operation of the present invention include roughing, Coil Box batch, finish rolling.
Roughing of the present invention is 5 road rollings, and outlet temperature is 1060~1140 DEG C.
Exit temperature at finishing of the present invention is 860~920 DEG C.
Laminar flow rate of cooling 15~30 DEG C/S in control refrigerating work procedure of the present invention, described coiling temperature is 570~630 DEG C.
In present invention process, slab preferentially uses straight dress.
The mentality of designing of chemical composition of the present invention: reach 800MPa level for realizing weather-resistant steel plate yield strength, the Comprehensive Control to greatest extent such as refined crystalline strengthening, precipitation strength, phase transformation strengthening and solution strengthening must be realized in hot rolling and subsequent cooling process, simultaneously for ensureing that there is good cold bending performance, microalloy element niobium is added in steel, to improve the recrystallization temperature of steel, make to complete rolling at a higher temperature and can also obtain storing the deformed austenite tissue of large deformation energy, and then obtain tiny phase-change organization.
C: Less than 0.12%, unfavorable to the atmospheric corrosion resistance of steel, C affects the welding performance of steel, cold short performance and punching performance etc. simultaneously, and in weathering steel, C content is controlled in less than 0.12%.
Below Si:0.40%, with other element such as P with the use of the weatherability that can improve steel.Higher Si content is conducive to refining a-Fe00H, thus reduces the corrosion rate that steel is overall.
Mn:1.60~2.00%, improves the intensity of steel by solution strengthening.Mn promotes the Carbonitride Precipitation dissolving when heating, the precipitation when rolling of the suppression precipitated phase, is conducive to keeping more separating out in element cooling procedure after rolling to separate out in ferrite, strengthens precipitation strength.In addition Mn can expand austenite phase field, reduces the transition temperature of overcooling austenite phase, the beneficially refinement of phase-change organization.
P: Less than 0.025%, it is to improve one of maximally effective alloying element of steel atmospheric corrosion resistance.When P with Cu combines in addition steel, demonstrate more preferable complex effect.Under the conditions of atmospheric corrosion, the P in steel is anode depolarizing agent, and it can accelerate uniform dissolution and the Fe of steel in steel2+Oxidation rate, contribute to being formed on steel surface uniform rusty scale, promote that generating amorphous state meets base ferrum oxide FeO × (OH)3 -2× fine and close protecting film, thus increase resistance, become corrosive medium and enter the protective barrier of steel matrix, make to exempt from inside steel atmospheric corrosion.When phosphorus forms P03 -4Time also act as corrosion inhibition.Low phosphorus content can make steel have good toughness, cold formability and weldability.
S: Less than 0.010%, weatherability is risen ill effect, low sulfur content makes steel have preferable toughness and cold formability.
In addition to Nb+V+Ti:0.10~0.40%, V effect that is relatively low except solution temperature and that stop recrystallization is more weak, there is similar effect with Nb.V only just has retardation function below 900 DEG C to recrystallization, and after austenite changes, almost oneself is completely dissolved V, so in solid solution, V is only used as a unit usually affects austenite to ferritic transformation.But compared with Nb, V makes those undesirable non-polygon ferrites produce less, and this characteristic is highly beneficial for the steel plate that thickness is bigger.Because V has stronger affinity, so V can fix " freely " nitrogen in steel, in steel with the nitrogen in steel, V with C and " freely " N is combined formation V (C, N) compound, greatly reduce " freely " N content in steel, it is to avoid the strain-aging of steel.
Nb: improved the intensity of steel by refined crystalline strengthening and precipitation strength, Nb can improve the recrystallization temperature of austenite, realize the rolling of austenite non-recrystallization zone the most at a higher temperature, thus rolled piece can be made to complete rolling deformation at a higher temperature, obtain tiny phase-change organization simultaneously.This outer portion Nb separates out in ferrite area, reinforced ferrite matrix.
Ti: improve the welding performance of steel, Ti also can extend the precipitation stage of incubation of NbC in adding Nb steel simultaneously, evening wanted by the Carbide Precipitation time started relatively Nb steel making Nb-Ti clad steel, thus the grain refinement effect of precipitate more small and dispersed titanium, showing as intensity and often improve 10MPa ductile-brittle transition temperature reduction by 6 DEG C, precipitation strength effect shows as intensity and often improves 10MPa ductile-brittle transition temperature rising 3.5 DEG C.
Ti Yu N combination at high temperature can effectively stop the combination of Nb Yu N, thus improves Nb solid solution capacity in austenite so that in ferrite, the precipitating reinforcing effect of Nb (C, N) strengthens subsequently.Another important feature of Ti is then in Al deoxidization steel, due to the affinity of Ti and S, controls the form of sulfide with Ti, increases Ti content and can form (Mn, Ti) S and Ti being difficult to plastic deformation4C2S2, improve the inhomogeneities of performance.
The mentality of designing of present invention process technological parameter:
Rolling mill practice: use Controlled Rolling And Controlled Cooling, the heating and temperature control middle upper limit in the range of 1240~1280 DEG C, exit temperature at finishing is the upper limit in 860~900 DEG C, guarantee the phase transformation rolling of single phase austenite district, the cold employing leading portion of layer concentrates cooling technique, deformation is combined with heat treatment phase, obtains desired tissue and crystal grain thinning, improve material mechanical performance and cold bending performance.
During rolling, steel billet start rolling temperature presses 1220~1300 DEG C of scope controls, at this temperature so that the most of niobium existed and the solid solution once again of the carbon of titanium, nitride, then separates out in rolling and coiling process, plays the effects such as crystal grain refinement and precipitation strength.
In conjunction with chemical composition designed by 800MPa grade high-strength weathering steel plate, selecting there being shifting impact from the point of view of precipitation strength and refined crystalline strengthening of rolling temperature, notice simultaneously, if rolling temperature height is in recrystallization state or incomplete recrystallized state to making material when rolling, may result in crystal grain refinement the most even mixed crystal and affect forming property, to sum up considering, exit temperature at finishing presses 860~920 DEG C of scope controls, and coiling temperature presses 570~630 DEG C of scope controls.
The present invention is according to the mechanism of action in controlled rolling and controlled cooling of the carbonitride of microalloy element:
The precipitation strength of microalloy element carbonitride is one of most important schedule of reinforcement in micro alloyed steel.Microalloy carbon, the precipitation of nitride are possible not only to produce precipitation strength, and may also reach up the purpose of crystal grain refinement.Wherein crystal grain refinement obtains by separating out Pinning crystal boundary.The precipitation having strain inducing to produce when hot-working or delay austenite recrystallization forms the finest ferrite crystal grain when can make austenite at cooling transformation.Invigoration effect is mainly separated out in ferrite when γ → α changes by microalloy carbide, nitride and produces, the precipitate of these small and disperseds separated out in ferrite not only produces significantly strengthens effect, and the ferrite crystal grain after changing or changing can be hindered to grow up, thus crystal grain thinning indirectly.
The precipitation effect when controlled rolling of the microalloy element carbonitride mainly has: the most molten microalloy carbonitride particle of soaking will stop the roughening of soaking austenite crystal by Pinning crystal boundary mechanism, it is ensured that obtains tiny soaking austenite crystal;In During Controlled Rolling, strain induced precipitate stops the recrystallization of deformed austeaite the most significantly by the effect of Pinning Grain and sub-grain boundary mutually;After controlled rolling phase transformation occurs, remain in the microalloy element in austenite and separate out in ferrite further, produce significant precipitating reinforcing effect.
Except, in addition to the impact of mechanical performance, the effect that the precipitate in ferrite hinders crystal grain to grow up is the most particularly significant, and particularly after hot-strip batches in cooling procedure, the size of precipitation is critically important.The size of precipitate can be controlled by controlling transition temperature.When coiling temperature is the lowest, separate out granule the thinnest.Simultaneously it can be seen that owing to rate of cooling increases, it is the most tiny that the size of precipitate becomes, also added intensity simultaneously.But, too fast rate of cooling can suppress to separate out, thus when low temperature batches, although ferritic crystallite dimension is the most tiny, but owing to precipitation strength weakens, yield strength will not be significantly improved.At this moment, the thinnest ferrite crystal grain provides nearly all intensity, thus intensity is not the highest, but has good plasticity and toughness.
It is characteristic of the invention that on the basis of conventional intensified element carbon, manganese, add vanadium, niobium, titanium composite micro-alloyed element, its intensity is provided by fine grain, and in micro alloyed steel, intensity is also had contributed much by the microalloy carbon of small and dispersed, the precipitation strength of nitride simultaneously.The control that the refinement of crystal grain and microalloy element carbon, nitride separate out can be realized by regulation controlled rolling and cooling process parameter.
Using and have the beneficial effects that produced by technique scheme: the 800MPa grade high-strength weathering steel plate produced by the present invention, tensile strength >=900MPa, yield strength >=800MPa, elongation percentage >=18%, be organized as ferrite and add pearlite, pearlite accounts for 10~16%;This steel plate mechanical property reach high-strength while, with good cold temperature impact and weather resistance.
Accompanying drawing explanation
The metallographic structure microgram of production steel plate 100 μm that Fig. 1 is the embodiment of the present invention 1;
The metallographic structure microgram of production steel plate 100 μm that Fig. 2 is the embodiment of the present invention 2;
The metallographic structure microgram of production steel plate 100 μm that Fig. 3 is the embodiment of the present invention 3;
The metallographic structure microgram of production steel plate 300 μm that Fig. 4 is the embodiment of the present invention 4;
The metallographic structure microgram of production steel plate 50 μm that Fig. 5 is the embodiment of the present invention 5;
The metallographic structure microgram of production steel plate 20 μm that Fig. 6 is the embodiment of the present invention 6.
Detailed description of the invention
Below in conjunction with the accompanying drawings and detailed description of the invention the present invention is further detailed explanation.
Embodiment 1
Thickness 3.5mm, width 1524mm, 800MPa grade high-strength weathering steel plate, described hot-rolled coil chemical constituent and percentage by weight be: C:0.06%, Si:0.08%, Mn:1.85%, P:0.014%, S:0.006%, Nb:0.055%, V:0.03%, Ti:0.11%, Mo:0.20%, Als:0.020%, N:0.0045%, surplus is Fe and inevitable impurity element.Weather-resistant steel plate is organized as ferrite and adds pearlite, and pearlite accounts for 13%.
Production method: 1) according to above-mentioned set component smelting molten steel, molten steel LF refine, sheet billet continuous casting operation obtain slab;2) by heating of plate blank to 1275 DEG C, batch through high-pressure water descaling, roughing, Coil Box, finish rolling, control cooling obtain hot-rolled coil.
Wherein roughing 5 road rolling, outlet temperature is 1100 DEG C;Exit temperature at finishing is 900 DEG C, 25 DEG C/min of section cooling speed, and coiling temperature is 610 DEG C.
Embodiment 2
Thickness 5.0mm, width 1524mm, 800MPa grade high-strength weathering steel plate, described hot-rolled coil chemical constituent and percentage by weight be: C:0.07%, Si:0.07%, Mn:1.90%, P:0.013%, S:0.0055%, Nb:0.050%, V:0.02%, Ti:0.12%, Mo:0.25%, Als:0.025%, N:0.0033%., surplus is Fe and inevitable impurity element.Weather-resistant steel plate is organized as ferrite and adds pearlite, and pearlite accounts for 14%.
Production method: 1) according to above-mentioned set component smelting molten steel, molten steel LF refine, sheet billet continuous casting operation obtain slab;2) by heating of plate blank to 1280 DEG C, batch through high-pressure water descaling, roughing, Coil Box, finish rolling, controlled rolling cooling obtain hot-rolled coil.
Wherein roughing 5 road rolling, outlet temperature is 1120 DEG C;Exit temperature at finishing is 890 DEG C, 23 DEG C/min of section cooling speed, and coiling temperature is 600 DEG C.
Embodiment 3
Thickness 6mm, width 1500mm, 800MPa grade high-strength weathering steel plate, described hot-rolled coil chemical constituent and percentage by weight be: C:0.075%, Si:0.075%, Mn:1.95%, P:0.014%, S:0.0045%, Nb:0.052%, V:0.025%, Ti:0.122%, Mo:0.30%, Als:0.030%, N:0.0043%, surplus is Fe and inevitable impurity element.Weather-resistant steel plate is organized as ferrite and adds pearlite, and pearlite accounts for 15%.
Production method: 1) according to above-mentioned set component smelting molten steel, molten steel LF refine, sheet billet continuous casting operation obtain slab;2) by heating of plate blank to 1250 DEG C, batch through high-pressure water descaling, roughing, Coil Box, finish rolling, controlled rolling cooling obtain hot-rolled coil.
Wherein roughing 5 road rolling, outlet temperature is 1090 DEG C;Exit temperature at finishing is 880 DEG C, 24 DEG C/min of section cooling speed, and coiling temperature is 590 DEG C.
Embodiment 4
Thickness 8mm, width 1500mm, 800MPa grade high-strength weathering steel plate, described hot-rolled coil chemical constituent and percentage by weight be: C:0.08%, Si:0.08%, Mn:2.0%, P:0.015%, S:0.006%, Nb:0.055%, V:0.030%, Ti:0.13%, Mo:0.35%, Als:0.040%, N:0.0050%, surplus is Fe and inevitable impurity element.Weather-resistant steel plate is organized as ferrite and adds pearlite, and pearlite accounts for 15%.
Production method: 1) according to above-mentioned set component smelting molten steel, molten steel LF refine, sheet billet continuous casting operation obtain slab;2) by heating of plate blank to 1280 DEG C, batch through high-pressure water descaling, roughing, Coil Box, finish rolling, controlled rolling cooling obtain hot-rolled coil.
Wherein roughing 5 road rolling, outlet temperature is 1120 DEG C;Exit temperature at finishing is 900 DEG C, 26 DEG C/min of section cooling speed, and coiling temperature is 620 DEG C.
Embodiment 5
Thickness 8mm, width 1500mm, 800MPa grade high-strength weathering steel plate, described hot-rolled coil chemical constituent and percentage by weight be: C:0.12%, Si:0.20%, Mn:1.95%, P:0.025%, S:0.006%, Nb:0.040%, V:0.010%, Ti:0.050%, Mo:0.45%, Als:0.015%, N:0.0080%, surplus is Fe and inevitable impurity element.Weather-resistant steel plate is organized as ferrite and adds pearlite, and pearlite accounts for 16%.
Production method: 1) according to above-mentioned set component smelting molten steel, molten steel LF refine, sheet billet continuous casting operation obtain slab;2) by heating of plate blank to 1300 DEG C, batch through high-pressure water descaling, roughing, Coil Box, finish rolling, controlled rolling cooling obtain hot-rolled coil.
Wherein roughing 5 road rolling, outlet temperature is 1140 DEG C;Exit temperature at finishing is 920 DEG C, 30 DEG C/min of section cooling speed, and coiling temperature is 630 DEG C.
Embodiment 6
Thickness 8mm, width 1500mm, 800MPa grade high-strength weathering steel plate, described hot-rolled coil chemical constituent and percentage by weight be: C:0.065%, Si:0.40%, Mn:1.60%, P:0.011%, S:0.010%, Nb:0.09%, V:0.10%, Ti:0.21%, Mo:0.10%, Als:0.050%, N:0.0042%, surplus is Fe and inevitable impurity element.Weather-resistant steel plate is organized as ferrite and adds pearlite, and pearlite accounts for 10%.
Production method: 1) according to above-mentioned set component smelting molten steel, molten steel LF refine, sheet billet continuous casting operation obtain slab;2) by heating of plate blank to 1220 DEG C, batch through high-pressure water descaling, roughing, Coil Box, finish rolling, controlled rolling cooling obtain hot-rolled coil.
Wherein roughing 5 road rolling, outlet temperature is 1060 DEG C;Exit temperature at finishing is 860 DEG C, 15 DEG C/min of section cooling speed, and coiling temperature is 570 DEG C.
Product in above-described embodiment 1-6 carrying out mechanics properties testing, yield strength 815~845MPa, tensile strength 915~935MPa, elongation percentage 21~25%, has good mechanical strength and plasticity coupling, specific targets are as shown in table 1:
Table 1 performance detection data
Embodiment Specification (mm) Yield strength Rt0.5(MPa) Tensile strength Rm(MPa) Elongation percentage (%) Cold bending test 180 °, laterally
1 3.5*1524 815 915 25 D=2a is intact
2 5.0*1524 845 935 23 D=2a is intact
3 6.0*1500 835 925 22 D=2a is intact
4 8.0*1500 820 920 21 D=2a is intact
5 6.0*1500 830 923 24 D=2a is intact
6 8.0*1500 838 933 22 D=2a is intact
Above example is only in order to illustrative not limiting technical scheme, although the present invention being described in detail with reference to above-described embodiment, it will be understood by those within the art that: still the present invention can be modified or equivalent, any modification or partial replacement without departing from the spirit and scope of the present invention, it all should be contained in the middle of scope of the presently claimed invention.

Claims (10)

1. a 800MPa grade high-strength weathering steel plate, it is characterized in that, described weather-resistant steel plate chemical composition and percentage by weight thereof are as follows: C≤0.12%, Si≤0.40%, Mn:1.60~2.00%, P≤0.025%, S≤0.010%, Nb+V+Ti:0.10~0.40%, Mo:0.10~0.45%, Als:0.015~0.050%, N≤0.008%, surplus is Fe and inevitable impurity element.
A kind of 800MPa grade high-strength weathering steel plate the most according to claim 1, it is characterised in that described weather-resistant steel plate performance indications are as follows: tensile strength >=900MPa, yield strength >=800MPa, elongation percentage >=18%.
A kind of 800MPa grade high-strength weathering steel plate the most according to claim 1, it is characterised in that described weather-resistant steel plate is organized as ferrite and adds pearlite, and its medium pearlite accounts for 10~16%.
4. production method based on a kind of 800MPa grade high-strength weathering steel plate described in claim 1-3 any one, it is characterised in that described production method includes following operation: converter smelting, LF refine, sheet billet continuous casting, heating of plate blank, high-pressure water descaling, controlled rolling, control cooling.
Production method the most according to claim 4, it is characterised in that described converter smelting obtains slab according to set component smelting molten steel, molten steel LF refine, sheet billet continuous casting operation.
Production method the most according to claim 4, it is characterised in that described heating of plate blank operation is by heating of plate blank to 1220~1300 DEG C.
7. according to the production method described in claim 4-6 any one, it is characterised in that described controlled rolling operation include roughing, Coil Box batch, finish rolling.
Production method the most according to claim 7, it is characterised in that described roughing is 5 road rollings, and outlet temperature is 1060~1140 DEG C.
Production method the most according to claim 7, it is characterised in that described exit temperature at finishing is 860~920 DEG C.
10., according to the production method described in claim 4-6 any one, it is characterised in that laminar flow rate of cooling 15~30 DEG C/S in described control refrigerating work procedure, described coiling temperature is 570~630 DEG C.
CN201610285086.6A 2016-04-28 2016-04-28 800MPa-grade high-strength and weather-proof steel plate and production method thereof Pending CN105838996A (en)

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CN108486476A (en) * 2018-05-25 2018-09-04 河钢股份有限公司承德分公司 700Mpa hot rollings containing vanadium checkered steel plate and its production method
CN110791703A (en) * 2019-09-30 2020-02-14 鞍钢股份有限公司 850 MPa-level medium-temperature high-pressure boiler steel plate and production method thereof
CN110983180A (en) * 2019-12-16 2020-04-10 首钢集团有限公司 Hot-rolled high-strength steel and preparation method and application thereof
CN111440991A (en) * 2020-04-07 2020-07-24 湖南华菱涟源钢铁有限公司 Hot rolled steel plate with yield strength of 800MPa and manufacturing method thereof
CN113106335A (en) * 2021-03-11 2021-07-13 邯郸钢铁集团有限责任公司 800 MPa-grade high-strength weather-resistant girder steel belt and preparation method thereof
CN113265596A (en) * 2021-04-14 2021-08-17 马鞍山钢铁股份有限公司 700 MPa-level high-strength weather-resistant steel plate resistant to atmospheric corrosion and production method thereof

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JP2013023721A (en) * 2011-07-20 2013-02-04 Jfe Steel Corp High strength steel sheet for warm forming and method of manufacturing the same
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Publication number Priority date Publication date Assignee Title
CN108486476A (en) * 2018-05-25 2018-09-04 河钢股份有限公司承德分公司 700Mpa hot rollings containing vanadium checkered steel plate and its production method
CN110791703A (en) * 2019-09-30 2020-02-14 鞍钢股份有限公司 850 MPa-level medium-temperature high-pressure boiler steel plate and production method thereof
CN110791703B (en) * 2019-09-30 2021-04-02 鞍钢股份有限公司 850 MPa-level medium-temperature high-pressure boiler steel plate and production method thereof
CN110983180A (en) * 2019-12-16 2020-04-10 首钢集团有限公司 Hot-rolled high-strength steel and preparation method and application thereof
CN111440991A (en) * 2020-04-07 2020-07-24 湖南华菱涟源钢铁有限公司 Hot rolled steel plate with yield strength of 800MPa and manufacturing method thereof
CN113106335A (en) * 2021-03-11 2021-07-13 邯郸钢铁集团有限责任公司 800 MPa-grade high-strength weather-resistant girder steel belt and preparation method thereof
CN113265596A (en) * 2021-04-14 2021-08-17 马鞍山钢铁股份有限公司 700 MPa-level high-strength weather-resistant steel plate resistant to atmospheric corrosion and production method thereof

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