CN108220812A - A kind of super ferrite stainless steel of plasticity containing rare earth high-strength and preparation method thereof - Google Patents

A kind of super ferrite stainless steel of plasticity containing rare earth high-strength and preparation method thereof Download PDF

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CN108220812A
CN108220812A CN201810111664.3A CN201810111664A CN108220812A CN 108220812 A CN108220812 A CN 108220812A CN 201810111664 A CN201810111664 A CN 201810111664A CN 108220812 A CN108220812 A CN 108220812A
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rare earth
stainless steel
strength
plasticity
rolling
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李阳
杨光
姜周华
秦国清
孙萌
吕剑波
杜鹏飞
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Northeastern University China
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Northeastern University China
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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
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • 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
    • 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
    • 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
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention belongs to stainless steel product and its manufacturing fields, announce a kind of super ferrite stainless steel of plasticity containing rare earth high-strength and preparation method thereof.A kind of super ferrite stainless steel of plasticity containing rare earth high-strength, it is made of the alloying elements such as C, Si, Mn, P, S and Cr, Mo, Nb, Ti, have the characteristics that high chrome molybdenum, low-carbon and nitrogen, niobium titanium bistable, containing rare earth；Thinning microstructure is particularly improved, go bad field trash, the strength of materials and toughness is promoted to be promoted simultaneously, so as to improve the comprehensive performance of material.Preparation method comprises the technical steps that：Smelting and casting, ingot casting or strand cogging, steel rolling and heat treatment, made this contains rare earth high-strength plasticity super ferrite stainless steel, and tensile strength reaches 620Pa 660MPa at room temperature, 590 630Mpa of yield strength, Vickers hardness is up to 260 270, the contraction percentage of area 65% 70%, elongation percentage 28 30%, improves the mechanical property of material and sea water resistance washes away and sand erosion performance.

Description

A kind of super ferrite stainless steel of plasticity containing rare earth high-strength and preparation method thereof
Technical field
The invention belongs to stainless steel product and its manufacturing fields, and in particular to a kind of super ferrite of plasticity containing rare earth high-strength Stainless steel material and preparation method thereof.
Background technology
Binhai Generator Station, as recirculated cooling water, easily makes condenser cooling tube that spot corrosion and gap corruption occur generally using seawater Erosion, a large amount of salt and microorganism be attached to tube wall incrustation and easily lead to underdeposit corrosion, while high quantity of sand and mud washes away easy production in seawater Raw erosion corrosion.The chromium content of super ferrite stainless steel belongs to high chromium content ferrite stainless steel generally 25%~30%.It compares White Copper Tubes, super ferrite stainless steel have the abilities such as better erosion resistance, crevice corrosion；Compared to titanium tube, have more excellent Different mechanical performance and anti-seismic performance and higher thermal conductivity factor, while consider economy, super ferrite stainless steel becomes shore The choosing of the economy of extra large power station condenser cooling tube.Since the super ferrite stainless steel of high chrome molybdenum is iron element in total temperature section Body tissue can not realize phase transition so as to thinning microstructure by eutectoid reaction, coarse tissue can seriously reduce steel intensity and Plasticity.On the one hand the mechanical performance during material processing and use is influenced, its sea water resistance on the one hand can be reduced and wash away and silt The ability of abrasion of particles.Therefore, coarse ferritic structure become influence super ferrite stainless steel realize industrialized production and The limitation sex chromosome mosaicism subsequently used.
China is rare earth reserves big country, therefore rare earth how to be utilized to improve steel product quality with strategic meaning.Rare earth Be added in steel, can not only go bad be mingled with, cleaning molten steel, can also refinement iron be reached in crystal boundary by solid solution effect and segregation The effect of ferritic tissue.Refined crystalline strengthening can not only improve intensity, but also do not damage the schedule of reinforcement of toughness as one kind, make realization The important method that the strong plasticity of stainless steel is promoted, it can promote the fracture mode of material to be improved simultaneously from brittleness to ductility transmition The hardness of material, so as to which the comprehensive performance for making material is substantially improved.
Chinese Patent Application No. CN103305766A discloses ferritic stainless steel and its manufacturer of a kind of high-strength plasticity Method limits essential element in steel, defines the technological parameter in manufacturing process.However cupric, Vanadium etc. in the invention Noble metal, while expensive rare-earth yttrium is added, increase the cost of invention.It is stainless that the invention simultaneously is not related to high chromium content ferrite Steel.
Chinese patent CN103614649A discloses a kind of high-strength tenacity high-strength plasticity martensitic stain less steel and its preparation side Method, tensile strength are up to its chemical composition of 1300~1800MPa as C0.15~0.4%, and N0~0.12%, Si0.2~ 2.5%, Mn 0.4~3.0%, S≤0.02%, P≤0.02%, Cr13.0~17.0%, Ni0~5.0%, Mo 0~ 2.0%, V0~0.3%, Nb 0~0.2%, Ti 0~0.05%, Al 0~0.8%, surplus are Fe and inevitable impurity. But since martensite is obtained by austenite rapid cooling, martensitic structure has the function of to strengthen matrix, at the same time material Plasticity and toughness can be greatly lowered, and be difficult to realize the best match of intensity and plasticity, therefore the material is only used for wanting plasticity and toughness Ask lower ground side.
Invention content
It is an object of the invention to announce a kind of super ferrite stainless steel of plasticity containing rare earth high-strength and preparation method thereof.One The kind super ferrite stainless steel of plasticity containing rare earth high-strength, chemical component weight proportioning are：C+N ＜ 0.012%, Si≤1.0%, Mn≤1.0%, P≤0.03%, S≤0.05%, Cr：25.0~28.0%, Mo：3.0%~4.0%, Ni：1.0%~ 3.5%, Ti+Nb：0.2%~1.0%, rare earth element ＜ 0.12%, total oxygen content are no more than 0.008%, and surplus is for Fe and not It can avoid impurity.
Further, above-mentioned rare earth element is Ce.
The preparation method of the above-mentioned super ferrite of plasticity containing rare earth high-strength stainless steel, includes the following steps：
(1) it smelts and casts
It is by weight percentage by chemical composition：C+N ＜ 0.012%, Si≤1.0%, Mn≤1.0%, P≤0.03%, S ≤ 0.05%, Cr：25.0~28.0%, Mo：3.0%~4.0%, Ni：1.0%~3.5%, Ti+Nb：0.2%~1.0%, Rare earth element ＜ 0.12%, surplus are configured to raw materials for metallurgy for Fe and inevitable impurity, and rare earth elements control before adding in Molten steel total oxygen content is no more than 0.008%；Rare earth element is cast immediately after adding in, and control rare earth element adds in and the time of stirring ≤65s；Cast temperature is controlled at 1550~1570 DEG C；
(2) ingot casting or strand cogging
Forging or strand cogging are using hammer cogging or continuous casting and rolling, and during using hammer cogging, slab heating temperature is 1030~1070 DEG C；Final forging temperature is air-cooled after forging not less than 870 DEG C；
(3) it hot rolling and is heat-treated after rolling
Blank keeps the temperature 1h at 1260~1280 DEG C, and start rolling temperature is 1240~1260 DEG C, and finishing temperature is not less than 900 DEG C, It rolls rear air-cooled；Blank is in 1030~1070 DEG C of heat preservations, water cooling after heat preservation；
(4) cold rolling and cold rolling after annealing
Cold rolling reduction ratio >=65%, cold rolling after annealing temperature is 920~1020 DEG C, air-cooled after heat preservation.
Further, the soaking time that above-mentioned steps (3) are heat-treated after rolling is 4 × t1min；Wherein, t1Hot rolling during for annealing The thickness of strip, unit are millimeter.
Further, the 30 × t of soaking time ＜ of above-mentioned steps (4) cold rolling after annealing2Min, wherein, t2It is cold during for annealing The thickness of strip is rolled, unit is millimeter.
A kind of prepared high-strength plasticity super ferrite stainless steel, at room temperature tensile strength reach 620Pa-660MPa, Yield strength 590-630Mpa, Vickers hardness reaches 260-270, contraction percentage of area 65%-70%, elongation percentage 28-30%, so as to solve Determined the material during processing and being on active service there are the problem of, while take into account economy.
Carbon and nitrogen, adversely affecting for super ferrite stainless steel nearly all come from carbon and nitrogen.Since carbon and nitrogen exist Solubility is relatively low in ferrite, and diffusion velocity is fast, and extra carbon, nitrogen exist in steel in the form of interstitial atom.In high temperature In cooling procedure after heating, the carbonitride of chromium, plasticity and toughness, corrosion resistance (the resistance to intergranular to ferritic stainless steel are easily generated The resistance to general corrosion of burn into, anticorrosion stress-resistant, resistance to spot corrosion, slit and corrosion resistant etc.) have an adverse effect.In the present invention, C+N is controlled ＜ 0.012%.
Chromium and molybdenum, chromium are the formation elements of ferritic phase, when chromium content is more than 13%, in the entire temperature of siderochrome phasor Section is all complete alpha ferrite phase region.Meanwhile chromium and molybdenum are that super ferrite stainless steel is made to have the most important of corrosion resisting property Alloying element.In Oxidant, Cr can be quickly generated Cr2O3, make stainless steel in corrosive environment even if by can destruction Restore quickly.Chromium can improve tensile strength and hardness to a certain extent, play the role of solution strengthening.But ferrite stainless Chromium content is too high in steel, and solution strengthening effect is not enough to make up intensity caused by the reduction of its caused austenite quantity and drops It is low.And with the increase of Cr contents, formation and the precipitation of σ phases can be accelerated, super ferrite stainless steel is made to generate embrittlement tendency, because This Cr content is higher, and the toughness of steel is poorer, and brittle transition temperature is higher.It is more excellent that the addition of molybdenum assigns super ferrite stainless steel Corrosion resistance.Molybdenum can promote concentration of the chromium in passivating film, and improve the stability of passivating film, improve its passivation energy Power improves resistance to spot corrosion and slit and corrosion resistant performance.Hardness, the intensity of ferritic stainless steel by solution strengthening, can also be made It improves.But the addition of molybdenum also results in the raising of brittle transition temperature, and accelerate the precipitation of the equal brittlement phase of σ phases, χ.The present invention In, keep Cr 25.0~28.0%, Mo 3.0%~4.0%
Niobium and titanium, in steel, Nb is easily combined with C, and Ti is easily combined with N, while Ti can also form TiO2, Ti2S in steel Deng O, S element in effectively fixed steel.Nb can improve elevated temperature strength, Ti improves its welding performance, inhibit Fe3Nb3C is precipitated, The Nb contents for ensureing to be dissolved in steel are not consumed, so that it is guaranteed that material still has excellent high temperature after long-time high-temperature aging Intensity.In the present invention, Ti+Nb0.2%~1.0% is kept,
Nickel, nickel in super ferrite stainless steel, primarily serve improve intensity, improve steel room temperature toughness, reduce it is crisp Sex reversal temperature (DBTT), the effects that improving corrosion resistance (including homogeneous corrosion, spot corrosion and the crevice corrosion behavior) of steel, but also can Adverse effect is brought to the anticorrosion stress-resistant of super ferrite stainless steel.In the present invention, Ni 1.0%~3.5% is kept
Oxygen, the oxygen in the stainless steel of super ferrite containing rare earth can deteriorate the toughness of steel, plasticity, while in order to play rare earth It is rotten to be mingled with and its solution strengthening effect, it is desirable that stringent control entire oxygen content in the steel content, in the present invention, total oxygen before control rare earth adds in Content ＜ 0.008%.
Phosphorus sulphur, the sulphur in steel can make the hot-working character of steel degenerate, so as to be cast when causing super ferrite stainless steel continuous casting Base cracks and the operation of rolling generates defect；The phosphorus of high level can cause steel " cold short ", not only reduce the plasticity and toughness of steel, And the welding performance and cold-bending property of steel are reduced, super ferrite stainless steel is usually served in seawater, and Service Environment is harsh, It is especially harsh to low-temperature flexibility requirement, consider, P≤0.03%, S≤0.05% are required in the present invention.
Silicomanganese, silicon generally use other than improving the antioxygenic property of steel with manganese collectively as deoxidier, the present invention In, keep Si content≤1.0%, Mn≤1.0%.
Trace rare-earth has the function of deep purifying molten steel, microalloying, control inclusion morphology and rotten is mingled with.Simultaneously Containing in niobium, titanium micro-alloyed steel, the compound action of rare earth and niobium titanium can more effectively inhibit progress of the dynamic in crystallization, can refine Deformation recrystallization crystallite dimension.The control of the super ferrite stainless steel of plasticity containing rare earth high-strength rare earth elements is in ＜ in the present invention 0.12%, excellent intensity and plasticity can be obtained, suitable content of rare earth can be selected according to requirements.
The beneficial effects of the present invention are：
The super ferrite stainless steel of plasticity containing rare earth high-strength of the present invention has high chrome molybdenum, low-carbon and nitrogen, niobium titanium bistable Change, the characteristics of containing rare earth；Thinning microstructure is particularly improved, go bad field trash, and the strength of materials and toughness is promoted to be promoted simultaneously, so as to Improve the comprehensive performance of material.
The super ferrite stainless steel of plasticity containing rare earth high-strength of the present invention is solved in industrialized production because of ferritic structure Caused by coarse the problems such as Cracks In Continuous Cast Billets, forging rolling crack；Improve the mechanical property of material and sea water resistance wash away and Sand erosion performance.
Description of the drawings
Fig. 1 is comparative example and embodiment 1-4 metallograph under the microscope of the present invention after state is forged, wherein (a) Content of rare earth is 0, and (b) content of rare earth is 0.015%, and (c) content of rare earth 0.033%, (d) content of rare earth 0.069%, (e) is dilute Native content 0.11%；
Fig. 2 is the comparative example after hot rolled strip of the present invention heat treatment and embodiment 1-4 stretching fractures under scanning electron microscope Picture.Wherein (a) content of rare earth is 0, and (b) content of rare earth is 0.015%, (c) content of rare earth 0.033%, (d) content of rare earth 0.069%, (e) content of rare earth 0.11%；
Fig. 3 is field trash pattern and corresponding energy spectrum diagram under stretching fracture scanning electron microscope of the present invention, wherein (a) content of rare earth It is 0, (b) is the energy spectrum diagram corresponding to (a), and (c) containing rare earth, (d) is the energy spectrum diagram corresponding to (c).
Specific embodiment
In order to preferably explain the present invention, in order to understand, with reference to embodiment, the present invention will be further described.
Containing rare earth high-strength plasticity super ferrite stainless steel credit of the table 1 for the comparative example and embodiment of the present invention；
The fabrication process parameters such as smelting, hot rolling, heat treatment of the table 2 for the present invention；
Material properties test result of the table 3 for the present invention.
Table 1
Serial number C N Si Mn P S Cr Mo Ti Nb Ni O Re
Comparative example 0.0052 0.0060 0.43 0.78 0.0093 0.0041 27.20 3.34 0.28 0.32 2.42 0.0034 0
Embodiment 1 0.0049 0.0069 0.44 0.69 0.0074 0.0019 26.97 3.25 0.24 0.31 2.50 0.0028 0.015
Embodiment 2 0.0062 0.0045 0.38 0.82 0.0063 0.0010 27.34 3.72 0.29 0.35 2.55 0.0026 0.033
Embodiment 3 0.0080 0.0038 0.32 0.88 0.0062 0.0009 27.54 3.55 0.22 0.30 2.33 0.0024 0.069
Embodiment 4 0.0071 0.0044 0.48 0.91 0.0060 0.0008 27.51 3.44 0.21 0.30 2.61 0.0023 0.11
Table 2
It should be noted that：Torrid zone heat treatment soaking time is 4 × t min, 30 × t of cold belt heat treatment soaking time ＜ The thickness mm of cold rolled sheet when min, t are annealing.
According to《GB228-2002 metal material tensile testing at ambient temperature》Tensile tests at room is carried out, is tested in the day island proper It is carried out on the AG-X plus almighty test machines of Tianjin, rate of extension is set as 3mmmin-1；Using Wilson's TUKON 1102 Vickers hardness instrument carries out Vickers hardness experiment, the results are shown in Table 3.
Table 3
The sample (a) for not adding rare earth is compared as can be seen from Table 3, and addition rare earth sample (b-e) makes the tension of material strong Raising 60-100MPa is spent, yield strength improves 150-180MPa, micro-vickers hardness improves 30-40.
Compared with comparative example (Fig. 1 a), the addition of embodiment (Fig. 1 b- Fig. 1 e) middle rare earth eliminates large-sized ferrite The formation of tissue, hence it is evident that alleviate the appearance of ribbon tissue.The homogenization of crystal grain and refinement alleviate material in loading process In problem of stress concentration, avoid the unexpected failure of material.
Fig. 2 is typical pattern schematic diagram of the fracture under scanning electron microscope after material fracture, it can be seen that all material breaks The mode of splitting is ductile rupture.Comparison diagram (2a), the addition of rare earth make the dimple of Fracture Profile in Metallic Materials in embodiment (Fig. 2 b- Fig. 2 e) more Refinement is small, illustrates that steel inclusion size is obviously reduced；Embodiment (Fig. 2 b- Fig. 2 e) Fracture Profile in Metallic Materials dimple more crypto set, explanation Steel inclusion is distributed more disperse, does not occur being unevenly distributed for dimple, it is suitable to illustrate rare earth adding quantity.
As shown in Image to left in Fig. 3, corresponding right side is then the scanning electron microscopic observation result of stretching fracture typical case's field trash Its energy spectrum analysis collection of illustrative plates, to determine the property of field trash.Find that a large amount of TiN, TiN are present in steel easily in comparative example (figure a) The stress concentration in material loading process is caused, so as to which the intensity and toughness of material can be greatly reduced；Embodiment 1-4 (figure c) is deposited In the globular inclusion of a large amount of small and disperseds, energy spectrum analysis its be CexOyS.The mistake of re inclusion and δ-Fe ferritic structures Extremely low with spending, on the one hand splendid equiax crystal during solidification of molten steel contributes to the refinement of crystal grain, another aspect Dispersed precipitate Re inclusion make material be on active service during be more uniformly stressed, also play the effect of precipitation strength.
The above described is only a preferred embodiment of the present invention, being not the limitation that other forms are done to the present invention, appoint What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc. Imitate embodiment.But it is every without departing from technical solution of the present invention content, technical spirit according to the present invention is to above example institute Any simple modification, equivalent variations and the remodeling made still fall within the protection domain of technical solution of the present invention.

Claims (5)

1. a kind of super ferrite stainless steel of plasticity containing rare earth high-strength, which is characterized in that its chemical component weight, which matches, is：C+N ＜ 0.012%, Si≤1.0%, Mn≤1.0%, P≤0.03%, S≤0.05%, Cr：25.0~28.0%, Mo：3.0%~ 4.0%, Ni：1.0%~3.5%, Ti+Nb：0.2%~1.0%, rare earth element ＜ 0.12%, total oxygen content is no more than 0.008%, surplus is Fe and inevitable impurity.
2. the super ferrite of plasticity containing rare earth high-strength stainless steel according to claim 1, which is characterized in that the rare earth member Element is Ce.
3. a kind of preparation method of the super ferrite of plasticity containing rare earth high-strength stainless steel described in claims 1 or 2, feature exist In including the following steps：
(1) it smelts and casts
It is by weight percentage by chemical composition：C+N ＜ 0.012%, Si≤1.0%, Mn≤1.0%, P≤0.03%, S≤ 0.05%, Cr：25.0~28.0%, Mo：3.0%~4.0%, Ni：1.0%~3.5%, Ti+Nb：0.2%~1.0%, it is dilute Earth elements ＜ 0.12%, surplus are configured to raw materials for metallurgy for Fe and inevitable impurity, control steel before rare earth elements add in Liquid total oxygen content is no more than 0.008%；Rare earth element is cast immediately after adding in, and the time that control rare earth element is added in and stirred≤ 65s；Cast temperature is controlled at 1550~1570 DEG C；
(2) ingot casting or strand cogging
Forging or strand cogging are using hammer cogging or continuous casting and rolling, during using hammer cogging, slab heating temperature for 1030~ 1070℃；Final forging temperature is air-cooled after forging not less than 870 DEG C；
(3) it hot rolling and is heat-treated after rolling
Blank keeps the temperature 1h at 1260~1280 DEG C, and start rolling temperature is 1240~1260 DEG C, and finishing temperature is not less than 900 DEG C, after rolling It is air-cooled；Blank is in 1030~1070 DEG C of heat preservations, water cooling after heat preservation；
(4) cold rolling and cold rolling after annealing
Cold rolling reduction ratio >=65%, cold rolling after annealing temperature is 920~1020 DEG C, air-cooled after heat preservation.
4. a kind of preparation method of the super ferrite of plasticity containing rare earth high-strength stainless steel according to claim 3, feature It is, the soaking time that step (3) is heat-treated after rolling is 4 × t1min；Wherein, t1The thickness of hot rolled strip, unit during for annealing For millimeter.
5. a kind of preparation method of the super ferrite of plasticity containing rare earth high-strength stainless steel according to claim 3 or 4, special Sign is, the 30 × t of soaking time ＜ of step (4) cold rolling after annealing2Min, wherein, t2The thickness of cold rolled sheet, single during for annealing Position is millimeter.
CN201810111664.3A 2018-02-05 2018-02-05 A kind of super ferrite stainless steel of plasticity containing rare earth high-strength and preparation method thereof Pending CN108220812A (en)

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CN109182897A (en) * 2018-08-24 2019-01-11 东北大学 A method of improving super ferrite stainless steel corrosion resistance to sulfuric acid
CN109825771A (en) * 2019-04-01 2019-05-31 天津威尔朗科技有限公司 A kind of novel middle manganese wear-resistant steel plate
CN111876661A (en) * 2020-06-17 2020-11-03 宁波宝新不锈钢有限公司 High-corrosion-resistance ferritic stainless steel for fuel cell and manufacturing method thereof
CN112981219A (en) * 2021-02-04 2021-06-18 北京科技大学 Preparation method of ferrite antibacterial stainless steel by precision investment casting
CN113234894A (en) * 2021-05-14 2021-08-10 东北大学 Method for improving corrosion resistance of nitrogen-containing duplex stainless steel
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CN109182897A (en) * 2018-08-24 2019-01-11 东北大学 A method of improving super ferrite stainless steel corrosion resistance to sulfuric acid
CN109825771A (en) * 2019-04-01 2019-05-31 天津威尔朗科技有限公司 A kind of novel middle manganese wear-resistant steel plate
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CN112981219A (en) * 2021-02-04 2021-06-18 北京科技大学 Preparation method of ferrite antibacterial stainless steel by precision investment casting
CN113234894A (en) * 2021-05-14 2021-08-10 东北大学 Method for improving corrosion resistance of nitrogen-containing duplex stainless steel
CN114015950A (en) * 2021-10-27 2022-02-08 山西帝思曼特殊金属科技有限公司 Ferrite stainless steel for tableware and preparation method thereof

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Application publication date: 20180629