CN109252091A - High tenacity high weather resistance steel and preparation method thereof - Google Patents
High tenacity high weather resistance steel and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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Abstract
The present invention relates to high-speed rail steel manufacturing fields more particularly to a kind of high tenacity high weather resistance steel and preparation method thereof.1) preparation method of high tenacity high weather resistance steel designed by the present invention is comprising steps of smelt: being by the ingredient of molten steel after the pig iron, steel scrap ferroalloy addition converter smelting, converter, blowing, the refining of RH furnace and its weight percent, C:0.06~0.17%, N:0.006~0.017%, Si:0.2~0.40%, Mn:0.8~1.7%, Ti:0.007%~0.020%, Cr:0.35~1.50%, Ni:0.154~1.00%, surplus Fe；It is 20~100 that wherein C/N ratio, which is 10~22, Ni/N ratio,；2) moulding by casting；3) hot rolling；4) cooling.Compared with traditional high tenacity high weather resistance steel, the present invention optimize the chemical component of steel, define C/N than with Ni/N ratio and improve processing step and improve the obdurability of base steel, enhance the corrosion resistance of base steel.
Description
Technical field
The present invention relates to high-speed rail steel manufacturing fields more particularly to a kind of high tenacity high weather resistance steel and preparation method thereof.
Background technique
China express railway development at present is swift and violent, and wherein bullet train critical component requires toughness and corrosion resistance high.With
The progress of industrial development, the life of the high-speed rail especially high-level high-speed rail high tenacity high weather resistance steel of high tenacity high weather resistance steel material
Production has had very big breakthrough, during which produces many more outstanding inventions, thus promote weathering steel to higher level and
The research and development of more dominance energy.
Such as application No. is 201010022912.0, in entitled " the high corrosion-resistant weathering steel containing Cr of good-toughness "
State's invention patent application document, a kind of preparation method of high corrosion-resistant weathering steel containing Cr of the disclosure of the invention, but this method does not have
There is the proportion of optimized alloy element, phosphorus content is lower, and in 0.01~0.06%C range, chromium content is higher, in 2.5~7.0% models
It encloses, weldability is poor.For another example application No. is 200710045329.X, it is entitled " a kind of high-corrosion resistant high-strength weather resisting steel and
The Chinese invention patent of its manufacturing method " joined a large amount of Cr element in the steel of the invention, and Cr is in 4.50~5.50% models
It encloses, Mn content is lower, and Mn is in 0.01~0.05% range.For another example application No. is 200510045624.6, entitled one kind
The Chinese invention patent application file of economy type weathering-resistant steel, invention adjustment member constituent content on the basis of Q235 steel, benefit
With the alloying of the elements such as Cu, Mn, Si, Al, produced under conditions of not changing Q235 steel production technology a kind of economical resistance to
Hou Gang.For another example application No. is 201010113848.7, the Chinese invention patent of entitled weather-resistant steel plate and its manufacturing method
Application documents are added numerous alloying elements such as Ti, Cr, Ni, Mo, Nb, V in the steel of invention preparation, obtain a kind of corrosion resistance
Energy is good, intensity is high, the high-strength high-toughness steel plate of good toughness.Cu, Cr, Ni are utilized in above four application for a patent for invention files
The price adjustment of equal elements improves corrosion resistance and toughness, but the addition of the elements such as Cu, Cr, Ni increases cost.
Summary of the invention
In order to solve problem above, it the object of the present invention is to provide a kind of high tenacity high weather resistance steel and preparation method thereof, obtains
The steel arrived have preferable toughness and corrosion resistance.
To achieve the above object, the present invention designed by high tenacity high weather resistance steel preparation method comprising steps of
1) it smelts
The pig iron, steel scrap ferroalloy are added to the ingredient and its weight of molten steel after converter smelting, converter, blowing, the refining of RH furnace
Percentage is C:0.06~0.17%, N:0.006~0.017%, Si:0.2~0.40%, Mn:0.8~1.7%, Ti:
0.007%~0.020%, Cr:0.35~1.50%, Ni:0.154~1.00%, surplus Fe；Wherein C/N ratio be 10~
22, Ni/N ratios are 20~100；
2) moulding by casting
Pouring temperature is controlled at 1520 DEG C~1555 DEG C, and Quick pouring is completed to obtain into fashioned iron；
3) hot rolling
Roughing is carried out after high pressure dephosphorization at fashioned iron, roughing temperature is 980 DEG C~1100 DEG C, then carries out finish rolling, finish rolling
Start rolling temperature is 900 DEG C~960 DEG C, and finishing temperature is 650 DEG C~790 DEG C；
4) cooling
Heat is strong cold with the speed progress of 40~100 DEG C/s after pricking, and is cooled to 450~550 DEG C, subsequently enters slow cooling section, cooling rate 5
~10 DEG C/s, it is cooled to room temperature.
Compared with traditional high tenacity high weather resistance steel, the present invention optimizes the chemical component of steel, defines C/N ratio and Ni/N ratio
And improve processing step come obtain institutional framework be ferrite+bainite+pearlite+retained austenite high tenacity height it is resistance to
It waits, improves the obdurability of base steel, enhance the corrosion resistance of base steel.
By controlling the ratio of C/N, the quantity of carbide intercrystalline precipitation is controlled, improves interstitial atom N's to greatest extent
Solubility enhances solution strengthening effect, weakens Carbide Precipitation tendency, improves the toughness of steel.By controlling Ni/N ratio, enhancing
The corrosion resistance of steel because the content for increasing Ni not only improves crystal boundary binding force, but also inhibits carbonitride intercrystalline precipitation, together
When the solid solubility of N can be improved, enhance the strengthening effect of N；And it will increase the precipitation trend of the nitride in matrix with N element
Also it can enhance, slacken anti intercrystalline corrosion performance, the mass percentage of N nitride intercrystalline precipitation at 0.006~0.017%
Unobvious, rationally controlling Ni/N ratio can make steel have good corrosion resistance and obdurability in 20~100 ranges.
In terms of the chemical component side of steel, by the way that Ti, Cr alloying element is added, it is high that high-speed rail is improved with phase transformation and solution strengthening
The titanium carbonitride fine particle of the intensity of toughness high weather resistance steel, disperse educt has preferable invigoration effect, simultaneously because Ni's adds
Enter to improve the solubility of N element, it is suppressed that the nitride intercrystalline precipitation of Cr is to improve the crystal boundary binding force of steel, into one
Step improves the intensity and toughness of matrix, illustrates below by way of chemical element and its range restriction.
C: carbon is cheap and effective intensified element, and in steel of the present invention, carbon is to obtain high-intensitive main intensified element.
Experiment turns out to be the intensity for obtaining 500MPa or more, and carbon content is typically no less than 0.06%, and need under the conditions of controlled rolling with
Nitrogen content keeps certain matching relationship.But excessively high carbon amounts will be such that the significant stone in bainite transformation area moves, and act on meeting with Cr
Promote Second Phase Precipitation, causes material fragility to increase, the phenomenon of toughness deficiency occur.In steel of the present invention design, carbon amounts control
In 0.06%~0.17% range, C/N ratio is controlled 10~22.
N: nitrogen is resourceful and cheap, and atomic volume is smaller compared with carbon atom, but invigoration effect becomes apparent from, in the present invention
In steel, nitrogen is present in body-centered cubic lattic with interstitial atom plays invigoration effect.In steel of the present invention design, nitrogen quantity control
System keeps certain proportionate relationship in 0.006~0.017% range, and with above-mentioned carbon content.
Mn: it to expand austenitic area element, is solid-solution in ferrite (or austenite) and strengthens matrix, moreover it is possible to the nitrogen in steel
Interaction improves impact flexibility.But manganese content is excessively high to cause grain coarsening and component segregation, therefore the present invention controls Mn
In 0.80~1.70% range.
Si:Si is solid-solution in steel, plays solution strengthening effect, Si element strong inhibition carbide during bainite transformation
The characteristics of intercrystalline precipitation, increases crystal boundary binding force, improves toughness, and improve basis material wearability.When silicone content is excessively high
The surface that will lead to steel plate occurs stammering or adhesion, also the plasticity and toughness of steel plate can be made to be remarkably decreased, so the present invention is by Si content
Control is in 0.20~0.40% range.
Ti:Ti is carbide, and Ti is extremely strong, very stable with the carbonitride binding force that N, C are formed, precipitation
The hard particles that the grain boundaries that carbonitride is enriched in steel inhibit crystal grain to grow up, and are precipitated improve the intensity and wearability of steel.
A certain amount of Ti in steel is added, a large amount of disperse educt TiN (C) particles of meeting, the Second Phase Particle of these disperse educts not only exist
High temperature section can effectively prevent crystal grain and grow up roughening, reduces coarse columnar structure and banded structure is formed, and can increase N's plus
Enter amount, be dissolved in more N atoms in γ and α phase, forms the obdurability that interstitial solid solution improves base steel.The Ti that the present invention is added
Content is 0.007%~0.020%.
The addition of Cr:Cr element can play good nitrogen fixation, while very heavy to the corrosion resistance for improving material
It wants, carries out benefit nitrogen in the chromium nitride that certain content can be added in the steel grade vacuum later period of the present invention, the nitrogen to compensate vacuum processing is former
Subflow is lost, and component system is finely tuned.But the increase of Cr element should not be too high in steel, and excessively high Cr is easy to be combined into M with C23C6Chemical combination
Object weakens crystal boundary, so that material is become fragile, and reduce the corrosion resistance of material, here by Cr control of element on 0.35~1.50% left side
It is right.
Solubility of the nitrogen in steel can be improved in the addition of Ni:Ni element, becomes easy the smelting of nitrogenous steel, while right
Improve material low-temperature flexibility and corrosion resistance it is extremely important, steel grade of the present invention by Ni control of element 0.154~1.00%, and
Certain proportionate relationship is kept with N, Ni/N ratio is controlled in 20~100 ranges.
In conclusion the present invention controls the ratio of C/N and Ni/N in the chemical component and control chemical component of steel and adopts
The obdurability that base steel is improved with process of the invention enhances the corrosion resistance of base steel.
Preferably, in the step 1), nitrogen/argon gas top-bottom blowing is used in converting process, nitrogen/argon gas is
1:3。
The method to blow with traditional pure argon, the present invention increase N in molten steel by using nitrogen/argon gas top-bottom blowing
Content.
Preferably, added in the step 1), in RH furnace refining process chromium nitride further control in molten steel N and
The content of Cr.
Compared with traditional method of refining, the present invention adds chromium nitride in refining process, on the one hand supplements chromium, another party
The content of nitrogen is finely tuned in face, and the nitrogen-atoms for compensating vacuum processing is lost.
Preferably, the chemical component of the high tenacity high weather resistance steel and its weight percent be, C:0.152~
0.168%, N:0.0077~0.0120%, Si:0.21~0.39%, Mn:0.98~1.7%, Ti:0.007%~
0.0160%, Cr:0.35~0.56%, Ni:0.154~0.66%, surplus Fe；Wherein C/N ratio is 12.67~21.82,
Ni/N ratio is 20~64.71.
Preferably, laggard in 1280~1380 DEG C of 1.5~2.5h of heat preservation processing at shaped blooms in the step 3)
Horizontal high voltage dephosphorization, preceding two reduction in pass >=30% in rough rolling process, behind select reduction ratio 14~16% per pass, roughing is tired
Product reduction ratio is greater than 70%；It is 74~76% that finish rolling, which adds up drafts,.
The institutional framework of the high tenacity high weather resistance steel obtained by the preparation method of above-mentioned high tenacity high weather resistance steel be ferrite+
Bainite+pearlite+retained austenite.
The present invention has the advantages that compared with prior art, the present invention provides a kind of preparation side of high tenacity high weather resistance steel
Method, by controlling the chemical component of steel and controlling what the ratio of C/N and Ni/N and control preparation process in chemical component obtained
High tenacity high weather resistance steel is that ferrite+bainite+pearlite+retained austenite four mixes tissue complex tissue, hence it is evident that is improved
The obdurability of base steel enhances the corrosion resistance of base steel.And compared with existing high tenacity high weather resistance steel, the present invention uses cheap
Alloying element reduces production cost.
Detailed description of the invention
Fig. 1 is the high tenacity high weather resistance steel microstructure metallographic microscope that the embodiment of the present invention 5 obtains；
Fig. 2 is the high tenacity high weather resistance steel microstructure EBSD figure that the embodiment of the present invention 5 obtains；
Retained austenite ration statistics figure in the high tenacity high weather resistance steel that Fig. 3 obtains for the embodiment of the present invention 5.
Specific embodiment
For a better understanding of the invention, invention is described in detail below with reference to drawings and concrete examples.
There are the price adjustments of the elements such as Cu, Cr, Ni to increase cost in technology of preparing to solve existing high tenacity high weather resistance steel
The problem of, the present invention provides a kind of preparation method of high tenacity high weather resistance steel, passes through the chemical component and controlization of control steel
It studies point ratio of middle C/N and Ni/N and uses process of the invention, improve the corrosion resistance and toughness of steel.Specifically
Ground is said, reasonably combined using C, N, Ni and Cr alloying element, and it is 20~100 that C/N ratio, which is 10~22, Ni/N ratio, sufficiently
The coordinative role of C, N in terms of Strengthening and Toughening is played, crystal boundary binding force is increased, improves impact flexibility and intensity, and coordinate to make with Cr
The corrosion resistance that steel is improved for matrix, effectively prevents the addition of the content of a large amount of Cr, passes through smelting, controlled rolling work again in technique
Skill obtains and a kind of mixes tissue complex tissue as the high-ductility of matrix using ferrite+bainite+pearlite+retained austenite four
Property high weather resistance steel.Below by by specific embodiment come the preferred side of the preparation method to high tenacity high weather resistance steel of the invention
Formula is described in detail.
Examples 1 to 10
High tenacity high weather resistance steel following steps in following embodiment are fabricated:
1) it smelts
The chemical component and its weight percent of high tenacity high weather resistance steel be, C:0.06~0.17%, N:0.006~
0.017%, Si:0.2~0.40%, Mn:0.8~1.7%, Ti:0.007%~0.020%, Cr:0.35~1.50%, Ni:
0.154~1.00%, surplus Fe.
Converter smelting is added in the pig iron, steel scrap ferroalloy, the additive amount of steel scrap is the 15% of total amount, and the pig iron and various iron close
Gold additive amount be added according to the weight percent of above-mentioned chemical component, then converter, and the big tank bottom of argon station with than
Value is that the nitrogen/argon gas top-bottom blowing of 1:3 improves the content of N, then using RH furnace refining addition chromium nitride, is on the one hand supplemented
On the other hand chromium finely tunes the content of nitrogen, the nitrogen-atoms for compensating vacuum processing is lost.Pass through nitrogen/argon gas top-bottom blowing and nitridation
It is 20~100 that C/N ratio, which is 10~22, Ni/N ratio, in the addition control molten steel of chromium.
2) moulding by casting
Pouring temperature is controlled at 1520 DEG C~1555 DEG C, and Quick pouring is completed, to improve molding quality.
3) hot rolling
Laggard horizontal high voltage dephosphorization is handled in 1280~1380 DEG C of 1.5~2.5h of heat preservation at shaped blooms, eliminates patina
Harm, subsequently into roughing.Roughing temperature is 980 DEG C~1100 DEG C, drafts in preceding two reduction in pass >=30%, behind
Reduction ratio 15% or so is selected per pass, and roughing accumulates reduction ratio and is greater than 70%；Finish rolling start rolling temperature is 900 DEG C~960 DEG C, eventually
Rolling temperature is 650 DEG C~790 DEG C, and adding up drafts is 75% or so.
4) cooling
It is strong cold with the speed progress of 40~100 DEG C/s after hot rolling, it is cooled to 450~550 DEG C, then into slow cooling section, cooling rate 5
~10 DEG C/s, it is cooled to room temperature.
Traditional high tenacity high weather resistance steel tissue is bainite+pearlite, in conjunction with shown in attached drawing 1~3, what the present invention obtained
High tenacity high weather resistance steel tissue is ferrite+bainite+pearlite+retained austenite.The present invention is resistance to by improving high tenacity height
The variation of the chemical component and fiting chemical ingredient of waiting steel improves preparation process, and structure of steel is made to change, and improves weathering steel
Toughness and corrosion resistance.
The chemical component and its weight percent of molten steel after refining in Examples 1 to 6 are shown in Table 1:
Table 1
| C | N | SI | Mn | TI | Cr | Cu | Ni | Mo | C/N | NI/N | |
| Embodiment 1 | 0.132 | 0.0060 | 0.35 | 1.24 | 0.0150 | 0.74 | - | 0.6 | - | 22 | 100 |
| Embodiment 2 | 0.060 | 0.0060 | 0.26 | 0.80 | 0.020 | 1.50 | - | 0.35 | - | 10 | 58.3 |
| Embodiment 3 | 0.168 | 0.0077 | 0.39 | 1.70 | 0.0070 | 0.35 | - | 0.154 | - | 21.82 | 20 |
| Embodiment 4 | 0.152 | 0.0120 | 0.21 | 0.98 | 0.0160 | 0.49 | - | 0.46 | - | 12.67 | 38.33 |
| Embodiment 5 | 0.156 | 0.0102 | 0.33 | 1.10 | 0.0086 | 0.56 | - | 0.66 | - | 15.29 | 64.71 |
| Embodiment 6 | 0.170 | 0.0170 | 0.38 | 1.12 | 0.0110 | 0.89 | - | 0.76 | - | 10.00 | 44.71 |
| Embodiment 7 | 0.133 | 0.0126 | 0.22 | 1.36 | 0.0140 | 1.35 | - | 1.00 | - | 10.56 | 79.4 |
| Embodiment 8 | 0.136 | 0.0131 | 0.27 | 1.58 | 0.0190 | 1.21 | - | 0.69 | - | 10.38 | 52.67 |
| Embodiment 9 | 0.170 | 0.017 | 0.20 | 1.69 | 0.0180 | 1.13 | - | 0.58 | - | 10 | 34.11 |
| Embodiment 10 | 0.082 | 0.0081 | 0.40 | 1.03 | 0.0168 | 0.98 | - | 0.61 | - | 10.12 | 75.31 |
| Comparative example 1 | 0.032 | - | 0.19 | 1.58 | 0.024 | 0.45 | - | 0.31 | 0.40 | - | - |
| Comparative example 2 | 0.004 | - | 0.25 | 0.035 | 0.03 | 5.50 | 0.40 | 0.20 | - | - | - |
"-" expression is not added with, and comparative example 1 is the Chinese invention patent application file of Publication No. CN102168229A, right
Than the Chinese invention patent application file that file 2 is Publication No. CN101376953A.
The technological parameter part table 2 of Examples 1 to 10, comparative example 1~2.
Table 2
The comprehensive mechanical property of Examples 1 to 10, comparative example 1~2 and high weather resistance steel Q450NQR1 is relatively shown in Table 3.It is resistance to
The test of atmospheric corrosion performance with the weathering steel period invades profit test method (TB/T2375-93) according to railway and carries out period of 72h and invades
Moisten cyclic corrosion experiment, acquires average corrosion rate by calculating sample unit area volume corrosion weight loss amount.
Table 3
From table 3 it can be seen that the present invention obtains the elongation percentage of high tenacity high weather resistance steel, impact flexibility compared with comparative example
It is improved with average corrosion rate, illustrates that high tenacity high weather resistance steel of the invention has preferable toughness and corrosion resistance.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (8)
1. a kind of high tenacity high weather resistance steel, which is characterized in that the chemical component and its weight percent of the high tenacity high weather resistance steel
Than for C:0.06~0.17%, N:0.006~0.017%, Si:0.2~0.40%, Mn:0.8~1.7%, Ti:0.007%
~0.020%, Cr:0.35~1.50%, Ni:0.154~1.00%, surplus Fe；Wherein C/N ratio is 10~22, Ni/N
Ratio is 20~100.
2. high tenacity high weather resistance steel according to claim 1, which is characterized in that the high tenacity high weather resistance steel chemistry at
Divide and its weight percent be C:0.152~0.168%, N:0.0077~0.0120%, Si:0.21~0.39%, Mn:
0.98~1.7%, Ti:0.007%~0.0160%, Cr:0.35~0.56%, Ni:0.154~0.66%, surplus Fe；Its
Middle C/N ratio is that 12.67~21.82, Ni/N ratio is 20~64.71.
3. high tenacity high weather resistance steel according to claim 1 or 2, which is characterized in that the group of the high tenacity high weather resistance steel
Knitting structure is ferrite+bainite+pearlite+retained austenite.
4. a kind of preparation method of high tenacity high weather resistance steel, which comprises the following steps:
1) it smelts
The pig iron, steel scrap ferroalloy are added to the ingredient and its weight percent of molten steel after converter smelting, converter, blowing, the refining of RH furnace
Than for C:0.06~0.17%, N:0.006~0.017%, Si:0.2~0.40%, Mn:0.8~1.7%, Ti:0.007%
~0.020%, Cr:0.35~1.50%, Ni:0.154~1.00%, surplus Fe；Wherein C/N ratio is 10~22, Ni/N
Ratio is 20~100；
2) moulding by casting
Pouring temperature is controlled at 1520 DEG C~1555 DEG C, and Quick pouring is completed to obtain into fashioned iron；
3) hot rolling
Roughing is carried out after high pressure dephosphorization at fashioned iron, roughing temperature is 980 DEG C~1100 DEG C, then carries out finish rolling, finish rolling open rolling
Temperature is 900 DEG C~960 DEG C, and finishing temperature is 650 DEG C~790 DEG C；
4) cooling
Heat is strong cold with the speed progress of 40~100 DEG C/s after pricking, and is cooled to 450~550 DEG C, subsequently enters slow cooling section, cooling rate 5~10
DEG C/s, it is cooled to room temperature.
5. the preparation method of high tenacity high weather resistance steel according to claim 4, which is characterized in that in the step 1), blow
Nitrogen/argon gas top-bottom blowing is used during refining, nitrogen/argon gas is 1:3.
6. the preparation method of high tenacity high weather resistance steel according to claim 4, which is characterized in that in the step 1), RH
The content that chromium nitride further controls N and Cr in molten steel is added in furnace refining process.
7. the preparation method of high tenacity high weather resistance steel according to claim 4, which is characterized in that the high tenacity high durable
The chemical component and its weight percent of steel be, C:0.152~0.168%, N:0.0077~0.0120%, Si:0.21~
0.39%, Mn:0.98~1.7%, Ti:0.007%~0.0160%, Cr:0.35~0.56%, Ni:0.154~0.66%,
Surplus is Fe；It is 20~64.71 that wherein C/N ratio, which is 12.67~21.82, Ni/N ratio,.
8. the preparation method of high tenacity high weather resistance steel according to claim 4, which is characterized in that molding in the step 3)
Steel billet handles laggard horizontal high voltage dephosphorization in 1280~1380 DEG C of 1.5~2.5h of heat preservation, and preceding two reduction in pass in rough rolling process >=
30%, behind select reduction ratio 14~16% per pass, roughing accumulates reduction ratio and is greater than 70%；Finish rolling add up drafts be 74~
76%.
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