CN106756628A - A kind of silicon nitrogenous austenitic stainless steel high and preparation method thereof - Google Patents
A kind of silicon nitrogenous austenitic stainless steel high and preparation method thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
- 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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- 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
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Abstract
The present invention proposes a kind of silicon nitrogenous austenitic stainless steel high, it is characterised in that：Its chemical analysis mass percent is：Chromium Cr：15 20%, nickel：15 20%, manganese Mn：2 5%, silicon Si：4.5 6.0%, molybdenum Mo：1 3%, copper Cu：0.5 1.5%, nitrogen N：0.1 0.3%, aluminium Al≤1.0%, rare earth elements RE：0.05 0.5%, carbon C≤0.03%, sulphur S≤0.010%, phosphorus P≤0.02%, iron Fe：Surplus.The present invention also proposes the preparation method of above-mentioned silicon nitrogenous austenitic stainless steel high.The silicon nitrogenous austenitic stainless steel high is mainly used in chemical field, especially sulfuric acid industry, it is also used in the fields such as food food and drink apparatus, jewellery and its environmental protection, the present invention is by optimizing silicone content, addition nitrogen, copper, aluminium and rare earth element improve the corrosion resistance of stainless steel, the stainless steel is had excellent cold and hot working performance and corrosion resistance.
Description
Technical field
The present invention relates to alloy field, more particularly to a kind of sulfuric acid corrosion resistant and the silicon high with excellent mechanical property contain
Nitrogen austenitic stainless steel and preparation method thereof.
Background technology
The external exploitation since the eighties in last century and the high-silicon austenite stainless steel using resistance to sulfuric acid, such as Canada
The Saramet stainless steels of exploitation, the Sandivik SX stainless steels of Sweden's exploitation, silicone content reaches more than 6%.SX stainless steels are
Through being widely used in high-temperature concentrated sulfuric acid field, for manufacturing the utensils such as cooler and dry absorption tower.In the mid-90 in last century moral
State develops 700Si high-silicon austenite stainless steels, and the content of silicon reaches more than 7%, with excellent mechanical property and corrosion resistance
Energy.
The high silicon stainless steel that the country specializes in high-temperature sulfuric acid also begins with the eighties in last century, wherein there is SS920 stainless
Steel, silicone content is 6%, has excellent decay resistance in high-temperature concentrated sulfuric acid.Although improving the silicon in austenitic stainless steel
Content can effectively improve the corrosion resistance to sulfuric acid of stainless steel, but high silicon content seriously restricts and have impact on the heat of stainless steel
Processing characteristics, therefore exploitation has excellent sulfur resistive acid corrosion, while the austenitic stainless steel with excellent processing characteristics is particularly weighed
Will.
The content of the invention
It is an object of the invention to provide a kind of with excellent high temperature resistant concentrated sulfuric acid corrosion and good cold and hot working performance
Silicon nitrogenous austenitic stainless steel high and preparation method thereof.
The present invention is achieved through the following technical solutions：
Silicon nitrogenous austenitic stainless steel high of the invention, its chemical analysis and mass percent are：Chromium Cr：15-20%, nickel
Ni：15-20%, manganese Mn：2-5%, silicon Si：4.5-6.0%, molybdenum Mo：1-3%, copper Cu：0.5-1.5%, nitrogen N：0.1-0.3%,
Aluminium Al≤1.0%, rare earth elements RE：0.05-0.5%, carbon C≤0.03%, sulphur S≤0.010%, phosphorus P≤0.02% is balance of
Iron Fe.
Preferably, the chemical analysis and mass percent of described silicon nitrogenous austenitic stainless steel high are：Chromium Cr：16-
18%, nickel：16-18%, manganese Mn：3-4%, silicon Si：4.5-5.5%, molybdenum Mo：2-3%, copper Cu：0.8-1.2%, nitrogen N：
0.15-0.25%, aluminium Al≤0.5%, rare earth elements RE：0.1-0.2%, carbon C≤0.03%, sulphur S≤0.010%, phosphorus P≤
0.02%, balance of iron Fe.
Preferably, include lanthanum in the rare earth elements RE, and lanthanum content account for the mass percent of rare earth elements RE total amount >=
90%.
Another object of the invention, the preparation method of described silicon nitrogenous austenitic stainless steel high includes following step
Suddenly：
Smelting ingot casting：The raw material that will have been matched is smelted in adding smelting furnace, and it is protective atmosphere to be employed nitrogen as in stove,
Nitrogen in alloy passes through granular Si3N4High nitrogen alloy mode is added；Wherein, when using vacuum induction melting, refined
Into rear addition nitrogen as protective atmosphere, control pressure is 0.02MPa-0.05MPa；Set using other nitrogen protection atmosphere meltings
During standby smelting, nitrogen pressure is controlled in 0.02MPa-0.1MPa；Ingot casting after the completion of smelting；
Steel ingot hot-working：By steel ingot 1050 DEG C -1200 DEG C Homogenization Treatments 4-10 hours, fully eliminate ingot casting in height
Silicon precipitated phase, makes the abundant solid solution of silicon field trash high in steel ingot；Cogging, bar and breaking down blank, finish-forging temperature are forged into using many fire
Degree is not less than 950 DEG C；
Blank is heat-treated：1100 DEG C -1200 DEG C solution treatment 0.5-4 hours, air cooling or water-cooled to room temperature, make chromium, copper,
The compound of molybdenum, nitrogen and silicon is mingled with abundant solid solution, and its microscopic structure is single phase austenite.
Preferably, the step processed using timeliness disperse treatment and pre-passivating stainless steel is also included after solution treatment
Suddenly；Described timeliness disperse treatment be 450 DEG C -600 DEG C ageing strengthening 0.5-4 hours, make the chemical combination of chromium, copper, nitrogen and silicon
Thing or other composition phase even dispersions are distributed in stainless steel inside and surface；Described pre-passivating treatment is big at 100-200 DEG C
Pre-passivating is incubated under compression ring border to process 0.5-2 hours, makes element and the air such as chromium, silicon, aluminium, copper, the nitrogen of stainless steel surfaces enrichment
There is oxidation reaction in middle oxygen, what surface formed micron thickness contains the composite passivated of the element oxides such as chromium, silicon, aluminium, copper, nitrogen
Film layer.
Further preferably, also include using at timeliness disperse treatment and anode polarization treatment stainless steel after solution treatment
The step of reason；Described timeliness disperse treatment be 450 DEG C -600 DEG C ageing strengthening 0.5-4 hours, make chromium, copper, nitrogen and silicon
Compound or other composition phase even dispersions be distributed in stainless steel inside and surface；Described anode polarization treatment is in solid solution
It is that stainless steel is carried out into anode pole in the potassium dichromate aqueous solution of+5% nitric acid of 5% sulfuric acid+2% in 200-300mV after treatment
Change, the composite passivated film layer containing elements such as chromium, silicon, aluminium, copper, nitrogen is formed in stainless steel surfaces.
Silicon nitrogenous austenitic stainless steel high of the invention has the excellent corrosion of the high temperature resistant concentrated sulfuric acid and good cold and hot working
Performance, based on existing chromium nickel stainless steel, suitably reduces silicone content, adds nitrogen to optimize the austenite of high silicon stainless steel
Tissue, improves the corrosion resisting property and mechanical property of stainless steel, at the same the addition rare earth RE element beneficial to stainless steel, molybdenum element,
Copper and aluminium element improve the corrosion resistance of stainless steel.Silicon nitrogenous austenitic stainless steel high of the invention can be applied to chemical industry neck
Domain, for sulfuric acid production and transportation and storage etc. and sulfuric acid contact apparatus and utensil, can be also used for food food and drink apparatus,
The field such as jewellery and environmental protection.
Brief description of the drawings
Fig. 1 is 1100 DEG C of metallographs of solution treatment 1 hour of stainless steel of embodiments of the invention 3.
Specific embodiment
Technical scheme is described in further detail below by embodiment.
Silicon nitrogenous austenitic stainless steel high of the invention, its chemical analysis and mass percent are：Chromium Cr：15-20%, nickel
Ni：15-20%, manganese Mn：2-5%, silicon Si：4.5-6.0%, molybdenum Mo：1-3%, copper Cu：0.5-1.5%, nitrogen N：0.1-0.3%,
Aluminium Al≤1.0%, rare earth elements RE：0.05-0.5%, carbon C≤0.03%, sulphur S≤0.010%, phosphorus P≤0.02% is balance of
Iron Fe.One preferred embodiment in, in order to ensure the processing characteristics of stainless steel, reduce the tearing tendency in process,
The content of silicon is 4.5-5.5%.
The preparation method of silicon nitrogenous austenitic stainless steel high of the invention comprises the following steps：
Smelting ingot casting：The raw material that will have been matched is smelted in adding smelting furnace, and it is protective atmosphere to be employed nitrogen as in stove；
Add nitrogen as protective atmosphere during using vacuum induction melting, after the completion of refining, control pressure is 0.02MPa-
0.05MPa, the nitrogen in alloy mainly passes through granular Si3N4High nitrogen alloy mode is added；It is molten using other nitrogen protection atmospheres
When refining equipment is smelted, nitrogen pressure should be controlled in 0.02MPa-0.1MPa；Ingot casting after the completion of smelting；
Steel ingot hot-working：By steel ingot 1050 DEG C -1200 DEG C Homogenization Treatments 4-10 hours, fully eliminate ingot casting in height
Silicon precipitated phase, makes the abundant solid solution of silicon field trash high in steel ingot；Cogging, bar and breaking down blank, finish-forging temperature are forged into using many fire
Degree is not less than 950 DEG C；
Blank is heat-treated：1100 DEG C -1200 DEG C solution treatment 0.5-4 hours, air cooling or water-cooled to room temperature, make chromium, copper,
The compound of molybdenum, nitrogen and silicon is mingled with abundant solid solution, and its microscopic structure is single phase austenite.
Silicon nitrogenous austenitic stainless steel high of the invention, it is excellent in order to obtain before carrying out Product processing after the solution treatment
Corrosion resistance and surface passivation effect need to carry out stainless steel at timeliness disperse treatment and pre-passivating treatment or anode polarization
Reason.Wherein described timeliness disperse treatment be 450 DEG C -600 DEG C ageing strengthening 0.5-4 hours, make chromium, copper, nitrogen and silicon
Compound or other composition phase even dispersions are distributed in stainless steel inside and surface；Then pre-passivating treatment is carried out to be included
Cr2O3, SiO2, Al2O3And Si3N4Deng layer compound passivation, under 100-200 DEG C of atmospheric environment be incubated pre-passivating treatment 0.5-2
Hour, in making the elements such as chromium, silicon, aluminium, copper, the nitrogen of stainless steel surfaces enrichment and air there is oxidation reaction in oxygen, and surface is formed
The composite passivated film layer containing element oxides such as chromium, silicon, aluminium, copper, nitrogen of micron thickness.
Described anode polarization treatment is after solution treatment, by stainless steel in the dichromic acid of+5% nitric acid of 5% sulfuric acid+2%
Anode polarization is carried out in 200-300mV in aqueous solutions of potassium, is formed in stainless steel surfaces and is contained the elements such as chromium, silicon, aluminium, copper, nitrogen
Composite passivated film layer.
Silicon nitrogenous austenitic stainless steel high of the invention, in order to ensure excellent mechanical property and corrosion resisting property, particularly
Cold-forming property, the carbon content in the strict control alloy of the present invention, carbon content control is in C≤0.03%.
The present invention contains nitrogen, and nitrogen first is the alloying element of stable austenite tissue, and the austenitizing ability of nitrogen is big
It is approximately 20-30 times of nickel, high silicon stainless steel is ferrite former due to silicon, it is stainless that the addition of nitrogen can effectively strengthen silicon high
The stability of steel austenite；Secondly the nitrogen in alloy be effectively improve corrosion resistance of austenitic stainless steels important element it
One, the nitrogen added in steel interacts together with molybdenum element and can significantly improve the decay resistance of stainless steel, particularly
Its pitting resistance, pitting corrosion resistant performance is significantly improved with the raising of nitrogen；Nitrogen in stainless steel can be with silicon unit
Element forms the composition that a small amount of silicon nitride participates in passivation layer in passivation for stainless steel layer, improves the corrosion resistance of high silicon stainless steel.Cause
This austenitic structure and raising corrosion resistance in order to further supplement and stablizing stainless steel, and in view of metallurgy factor and to cold
The influence of processability and cold formability energy, Control of Nitrogen Content of the present invention is in 0.1-0.3%.
The present invention contains chromium, and chromium is that high silicon stainless steel has the topmost alloying element of corrosion resistance, in oxide isolation
In, chromium can make to be quickly generated chromium oxide (such as Cr on alloy surface2O3) passivating film, improve stainless steel corrosion resistance.Due to chromium
It is main anti-corrosion element in stainless steel, and improves the solubility of nitrogen in alloy, it is contemplated that chromium is ferrite former,
Chromium content control of the present invention is in 15-20%.
The present invention contains nickel element, and nickel is the main alloy element that high silicon stainless steel has austenite structure, while improving
The corrosion resistance of stainless steel is big due to ferrite former silicon because nickel is main austenite former in stainless steel
Amount is added, and in order to ensure the austenite structure of stabilization, nickel content control of the present invention is in 16-20%.
The present invention contains molybdenum element, and molybdenum adds the corrosion resistance for being mainly used to improve steel, particularly resistance to spot corrosion and crevice corrosion
Etc. performance, the addition of molybdenum can improve corrosion resistance with the element synergy such as chromium, nitrogen, it is contemplated that molybdenum is ferrite forms unit
Element, molybdenum content control of the present invention is in 1-3%.
The present invention contains copper, and copper is weaker austenizer, and also properly increasing corrosion resistance and molybdenum element can be with
Collaboration improves the corrosion resistance of stainless steel, and a small amount of copper can also improve the corrosion resistance and cold forming capability of stainless steel, and copper exists
Solid solution can be formed in nickel austenite stainless steel with nickel and existed, consider copper content control of the present invention in 0.5-
1.5%.
The present invention contains rare earth element, and rare earth can play cleaning molten steel in the smelting of stainless steel, reduces and change folder
Shape of debris etc. is acted on, and in order to reduce mischmetal to not clear influence of the invention, rare earth element of the present invention is with lanthanum element
Main (>=90%), it is contemplated that a large amount of rare earth elements influence the mechanical property of stainless steel, and content of rare earth control of the present invention is in 0.05-
0.5%.
The present invention contains manganese element, and manganese element is austenite former, with strong stabilization stainless steel austenitic matrix
Effect, another important effect of manganese element in the present invention be increase nitrogen in steel solubility, it is contemplated that the nitrogen in alloy contains
Amount, manganese content control of the present invention is in 2-5%.
In the present invention, aluminium can participate in the formation of passivating film, high alumina austenitic stainless steel table in austenitic stainless steel
Face can form alumina composite film, effectively improve corrosion resisting property, and aluminium content control of the present invention is no more than 1.0%.
Sulphur and phosphorus are considered as objectionable impurities in the present invention, therefore present invention control sulfur content is not more than 0.01%, controls phosphorus
Content is not more than 0.02%.
Surface passivation layer of the present invention contains the alloying elements such as chromium, silicon, molybdenum, aluminium and nitrogen, forms compound blunt in stainless steel surfaces
Change layer, mainly comprising Cr2O3, SiO2, Al2O3And Si3N4Deng, therefore with excellent sulfuric-resisting corrosive nature.
Embodiment 1：A kind of conventional high silicon stainless steel, as the compared steel of the embodiment of the present invention, its chemical analysis quality hundred
Point ratio is：C0.021, Cr17.2, Mn1.78, Mo2.25, Ni18.1, Al≤0.02, Si5.84, S0.0076, P0.011, surplus
Fe.Using conventional heat processing technique and Technology for Heating Processing, along perpendicular to rolling direction sampling, thickness of slab 12mm, size 11mm is obtained
The test square stock sample of × 11mm, Mechanics Performance Testing is carried out to sample, and the mechanical property for measuring sample is listed in shown in table 1, and
Sampling immersion in 90 ° of 98% concentrated sulfuric acid tests its corrosion rate in one day and seven days, and the corrosion rate for measuring is listed in shown in table 2.
Embodiment 2：Silicon nitrogenous austenitic stainless steel high of the invention, its chemical analysis mass percent is：C0.019,
Cr18.9, Mn2.63, N 0.15, Mo1.88, Cu 1.14, Ni 16.91, La0.3, Al0.67, Si4.92, S0.0081,
P0.014, surplus Fe；Using 1 kilogram of vacuum induction furnace smelting, protection nitrogen pressure is 0.01MPa, the Si that nitro-alloy is3N4,
Heat processing technique is：Alloy pig is forged into performance test in 1150 DEG C of ± 15 DEG C of homogenization heat treatment coggings in 4 hours, point three fire
Sheet material, the present embodiment thickness of slab is 12mm, and final forging temperature is 950 DEG C；Technology for Heating Processing is：Test sheet material is along perpendicular to processing side
To sampling, the test square stock of 11mm × 11mm is cut into, in 1100 DEG C of ± 5 DEG C of solution treatment (1 ± 0.1) hours, air cooling or water
It is cooled to room temperature, makes the compound of chromium, copper, molybdenum, nitrogen and silicon or be mingled with abundant solid solution, its microscopic structure is single phase austenite；
500 DEG C homogenize Ageing Treatment 2 hours, and chromium, copper, nitrogen and element silicon even dispersion are distributed in inside stainless steel in making stainless steel
And surface, carried out under 120 DEG C of atmospheric environments insulation pre-passivating process 1 hour, make stainless steel surfaces formed containing chromium, silicon, aluminium,
The composite passivated film layer of the elements such as copper, nitrogen, all mechanical test samples along perpendicular to rolling direction sampling, power are carried out to sample
Performance test is learned, the mechanical property for measuring sample is listed in shown in table 1.
Embodiment 3：A kind of silicon nitrogenous austenitic stainless steel high of the invention, its chemical analysis mass percent is：
C0.023, Cr17.28, Mn4.13, N 0.24, Mo2.15, Cu 0.98, Ni 17.02, La0.1, Al0.42, Si5.15,
S0.0096, P0.017, surplus Fe.Using 1 kilogram of vacuum induction furnace smelting, protection nitrogen pressure is 0.03MPa, nitro-alloy
The Si for being3N4, heat processing technique is：Alloy pig is in 1150 DEG C of ± 15 DEG C of homogenization heat treatment coggings in 4 hours, point three fire time forgings
Into capability test board material, the present embodiment thickness of slab is 12mm, and final forging temperature is 950 DEG C；Technology for Heating Processing is：Test sheet material is along vertical
It is straight to cut into the test square stock of 11mm × 11mm in machine direction sampling, it is small in 1100 DEG C of ± 5 DEG C of solution treatment (1 ± 0.1)
When, air cooling or water-cooled make the compound of chromium, copper, molybdenum, nitrogen and silicon or are mingled with abundant solid solution to room temperature, and its microscopic structure is single
Phase austenite；Ageing Treatment is homogenized at 500 DEG C 2 hours, chromium, copper, nitrogen and element silicon even dispersion are distributed in making stainless steel
Inside stainless steel and surface, insulation pre-passivating is carried out under 120 DEG C of atmospheric environments and is processed 1 hour, form stainless steel surfaces
Composite passivated film layer containing elements such as chromium, silicon, aluminium, copper, nitrogen, all mechanical test samples edge takes perpendicular to rolling direction
Sample, Mechanics Performance Testing is carried out to sample, and the mechanical property for measuring sample is listed in shown in table 1, and is sampled in 90 ° of 98% concentrated sulfuric acid
Middle immersion tests its corrosion rate in one day and seven days, and the corrosion rate for measuring is listed in shown in table 2.
Embodiment 4：A kind of silicon nitrogenous austenitic stainless steel high, its chemical analysis mass percent is：C0.017,
Cr17.54, Mn4.96, N 0.30, Mo2.74, Cu 1.26, Ni 18.12, La0.08, Al0.31, Si5.69, S0.0074,
P0.009, surplus Fe；Using 1 kilogram of vacuum induction furnace smelting, protection nitrogen pressure is 0.05MPa, the Si that nitro-alloy is3N4,
Heat processing technique is：Alloy pig is forged into performance test in 1150 DEG C of ± 15 DEG C of homogenization heat treatment coggings in 4 hours, point three fire
Sheet material, the present embodiment thickness of slab is 12mm, and final forging temperature is 950 DEG C；Technology for Heating Processing is：Test sheet material is along perpendicular to processing side
To sampling, the test square stock of 11mm × 11mm is cut into, in 1100 DEG C of ± 5 DEG C of solution treatment (1 ± 0.1) hours, air cooling or water
It is cooled to room temperature, makes the compound of chromium, copper, molybdenum, nitrogen and silicon or be mingled with abundant solid solution, its microscopic structure is single phase austenite；
500 DEG C homogenize Ageing Treatment 2 hours, and chromium, copper, nitrogen and element silicon even dispersion are distributed in inside stainless steel in making stainless steel
And surface, carried out under 120 DEG C of atmospheric environments insulation pre-passivating process 1 hour, make stainless steel surfaces formed containing chromium, silicon, aluminium,
The composite passivated film layer of the elements such as copper, nitrogen, all mechanical test samples along perpendicular to rolling direction sampling, power are carried out to sample
Performance test is learned, the mechanical property for measuring sample is listed in shown in table 1.
Table 1：The mechanical property of sample
Table 2：The corrosion rate of embodiment 3 and the sample of embodiment 1 after immersion in 90 ° of 98% concentrated sulfuric acid
From embodiment test result, the intensity of more conventional high silicon stainless steel of the invention is significantly improved, corrosion resisting property
Also it is significantly increased.
Silicon nitrogenous austenitic stainless steel high of the invention, with excellent high temperature resistant concentrated sulfuric acid corrosion and good cold and hot working
Performance, based on existing chromium nickel stainless steel, suitably reduces silicone content, adds nitrogen to optimize the Ovshinsky of high silicon stainless steel
Body tissue, improves the corrosion resisting property and mechanical property of stainless steel, while the addition rare earth RE element beneficial to stainless steel, molybdenum unit
Element, copper and aluminium element improve the corrosion resistance of stainless steel, and rare earth element can be reduced and press from both sides in high silicon stainless steel with cleaning molten steel
Debris, aluminium element can also participate in the composition of passivating film, improve the corrosion resistance of stainless steel, and copper can improve the cold of stainless steel
Processing characteristics and corrosion resistance, properly increase manganese element to stablize the nitrogen element content in stainless steel.The present invention be silicon high and chromium,
Nickel, molybdenum, copper, aluminium, the ultra-low carbon austenitic Stainless Steel of rare earth element composite alloying, be the high temperature resistant concentrated sulfuric acid corrosion it is excellent not
Rust Steel material.The range of application of present invention silicon nitrogenous austenitic stainless steel high：It is mainly used in chemical field, for the production of sulfuric acid
With transport and storage etc. and the apparatus and utensil of sulfuric acid contact, the fields such as food food and drink apparatus, jewellery and environmental protection are can be also used for.
The invention is not limited in described embodiment, those skilled in the art is not departing from spirit of the invention i.e. public affairs
In the range of opening, can still make some amendments or change, thus the scope that is limited with claims of the scope of the present invention as
It is accurate.
Claims (6)
1. a kind of silicon nitrogenous austenitic stainless steel high, it is characterised in that：Its chemical analysis mass percent is：Chromium Cr：15-
20%, nickel：15-20%, manganese Mn：2-5%, silicon Si：4.5-6.0%, molybdenum Mo：1-3%, copper Cu：0.5-1.5%, nitrogen N：
0.1-0.3%, aluminium Al≤1.0%, rare earth elements RE：0.05-0.5%, carbon C≤0.03%, sulphur S≤0.010%, phosphorus P≤
0.02%,：Balance of iron Fe.
2. a kind of silicon nitrogenous austenitic stainless steel high as claimed in claim 1, it is characterised in that：Its chemical analysis quality percentage
Than for：Chromium Cr：16-18%, nickel：16-18%, manganese Mn：3-4%, silicon Si：4.5-5.5%, molybdenum Mo：2-3%, copper Cu：0.8-
1.2%, nitrogen N：0.15-0.25%, aluminium Al≤0.5%, rare earth elements RE：0.1-0.2%, carbon C≤0.03%, sulphur S≤
0.010%, phosphorus P≤0.02%, balance of iron Fe.
3. a kind of silicon nitrogenous austenitic stainless steel high as claimed in claim 1 or 2, it is characterised in that：The rare earth elements RE
In include lanthanum, lanthanum content accounts for mass percent >=90% of rare earth elements RE total amount.
4. a kind of preparation method of silicon nitrogenous austenitic stainless steel high, it comprises the following steps：
Smelting ingot casting：Smelted during smelting furnace will be added according to the ready raw material of the proportioning of claim 1 or 2, adopted in stove
With nitrogen as protective atmosphere, the nitrogen in alloy passes through granular Si3N4High nitrogen alloy mode is added；Wherein, when using vacuum
Add nitrogen as protective atmosphere during induction furnace melting, after the completion of refining, control pressure is 0.02MPa-0.05MPa；Using it
When its nitrogen protection atmosphere smelting equipment is smelted, nitrogen pressure is controlled in 0.02MPa-0.1MPa；Ingot casting after the completion of smelting；
Steel ingot hot-working：By steel ingot 1050 DEG C -1200 DEG C Homogenization Treatments 4-10 hours, fully eliminate ingot casting in silicon high analysis
Go out phase, make the abundant solid solution of silicon field trash high in steel ingot；Cogging, bar and breaking down blank are forged into using many fire, and final forging temperature is not
Less than 950 DEG C；And
Blank is heat-treated：1100 DEG C -1200 DEG C solution treatment 0.5-4 hours, air cooling or water-cooled to room temperature, make chromium, copper, molybdenum,
The compound of nitrogen and silicon is mingled with abundant solid solution, and its microscopic structure is single phase austenite.
5. a kind of preparation method of silicon nitrogenous austenitic stainless steel high as claimed in claim 4, it is characterised in that at solid solution
Also include the step of being processed using timeliness disperse treatment and pre-passivating stainless steel after reason；Described timeliness disperse treatment be
450 DEG C -600 DEG C ageing strengthening 0.5-4 hours, be distributed the compound of chromium, copper, nitrogen and silicon or other composition phase even dispersions
Inside stainless steel and surface；Described pre-passivating treatment is that pre-passivating treatment 0.5-2 is incubated under 100-200 DEG C of atmospheric environment
Hour, in making the elements such as chromium, silicon, aluminium, copper, the nitrogen of stainless steel surfaces enrichment and air there is oxidation reaction in oxygen, and surface is formed
The composite passivated film layer containing element oxides such as chromium, silicon, aluminium, copper, nitrogen of micron thickness.
6. a kind of preparation method of silicon nitrogenous austenitic stainless steel high as claimed in claim 4, it is characterised in that at solid solution
Also include the step of being processed using timeliness disperse treatment and anode polarization treatment stainless steel after reason；At described timeliness disperse
Reason be 450 DEG C -600 DEG C ageing strengthening 0.5-4 hours, make the compound of chromium, copper, nitrogen and silicon or other compositions mutually it is uniform more
Dissipate and be distributed in stainless steel inside and surface；It is in 5% sulfuric acid by stainless steel after solution treatment that described anode polarization treatment is
Carry out anode polarization in 200-300mV in the potassium dichromate aqueous solution of+5% nitric acid+2%, stainless steel surfaces formed containing chromium,
The composite passivated film layer of the elements such as silicon, aluminium, copper, nitrogen.
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| CN110760830A (en) * | 2019-11-25 | 2020-02-07 | 和县卜集振兴标准件厂 | Passivation process for 304 stainless steel nut |
| CN111394640A (en) * | 2020-03-27 | 2020-07-10 | 宝钢特钢长材有限公司 | Iron-nickel gas valve alloy and preparation method thereof |
| CN111575693A (en) * | 2020-06-15 | 2020-08-25 | 武汉迪赛环保新材料股份有限公司 | Chromium-free pre-passivation solution for hot-dip galvanized steel pipe |
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| CN112771181A (en) * | 2018-08-29 | 2021-05-07 | 凯密迪公司 | Austenitic stainless steel alloy with superior corrosion resistance |
| CN113166894A (en) * | 2018-11-29 | 2021-07-23 | 株式会社Posco | Ferritic stainless steel with improved corrosion resistance and method for manufacturing same |
| CN113198956A (en) * | 2021-04-13 | 2021-08-03 | 中国科学院金属研究所 | Forging method of austenitic stainless steel with ultrahigh silicon content |
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| CN111394640A (en) * | 2020-03-27 | 2020-07-10 | 宝钢特钢长材有限公司 | Iron-nickel gas valve alloy and preparation method thereof |
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| CN111575693A (en) * | 2020-06-15 | 2020-08-25 | 武汉迪赛环保新材料股份有限公司 | Chromium-free pre-passivation solution for hot-dip galvanized steel pipe |
| CN113198956A (en) * | 2021-04-13 | 2021-08-03 | 中国科学院金属研究所 | Forging method of austenitic stainless steel with ultrahigh silicon content |
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| CN114318169A (en) * | 2021-11-16 | 2022-04-12 | 上海交通大学 | Aluminum-containing austenitic stainless steel resistant to supercritical water/supercritical carbon dioxide corrosion |
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