CN106636858A - Method for producing high-anticorrosive high-nitrogen super austenitic stainless steel - Google Patents
Method for producing high-anticorrosive high-nitrogen super austenitic stainless steel Download PDFInfo
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- CN106636858A CN106636858A CN201610938389.3A CN201610938389A CN106636858A CN 106636858 A CN106636858 A CN 106636858A CN 201610938389 A CN201610938389 A CN 201610938389A CN 106636858 A CN106636858 A CN 106636858A
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- nitrogen
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- smelting
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 263
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 146
- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 238000003723 Smelting Methods 0.000 claims abstract description 38
- 238000007664 blowing Methods 0.000 claims abstract description 33
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 29
- 239000010959 steel Substances 0.000 claims abstract description 29
- 238000005275 alloying Methods 0.000 claims abstract description 25
- 238000005266 casting Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 20
- 230000006698 induction Effects 0.000 claims abstract description 16
- 238000002844 melting Methods 0.000 claims abstract description 16
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 15
- 230000008018 melting Effects 0.000 claims abstract description 14
- 230000023556 desulfurization Effects 0.000 claims abstract description 9
- 229910052804 chromium Inorganic materials 0.000 claims description 26
- 239000011651 chromium Substances 0.000 claims description 26
- 238000005260 corrosion Methods 0.000 claims description 26
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 18
- 239000002994 raw material Substances 0.000 claims description 17
- 239000004411 aluminium Substances 0.000 claims description 16
- 229910052782 aluminium Inorganic materials 0.000 claims description 16
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 16
- ATTFYOXEMHAYAX-UHFFFAOYSA-N magnesium nickel Chemical compound [Mg].[Ni] ATTFYOXEMHAYAX-UHFFFAOYSA-N 0.000 claims description 16
- 229910000861 Mg alloy Inorganic materials 0.000 claims description 15
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 15
- 229910052759 nickel Inorganic materials 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 12
- 150000002910 rare earth metals Chemical class 0.000 claims description 12
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 11
- 238000005272 metallurgy Methods 0.000 claims description 11
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 11
- 229910052748 manganese Inorganic materials 0.000 claims description 10
- 239000011572 manganese Substances 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 10
- 229910052750 molybdenum Inorganic materials 0.000 claims description 10
- 229910052710 silicon Inorganic materials 0.000 claims description 10
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 7
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 7
- 241001062472 Stokellia anisodon Species 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 239000000155 melt Substances 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 238000010792 warming Methods 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 239000011777 magnesium Substances 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 238000005204 segregation Methods 0.000 abstract description 6
- 239000003795 chemical substances by application Substances 0.000 abstract description 5
- 230000003009 desulfurizing effect Effects 0.000 abstract description 4
- 239000011148 porous material Substances 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract 1
- 238000005086 pumping Methods 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 13
- 229910045601 alloy Inorganic materials 0.000 description 8
- 239000000956 alloy Substances 0.000 description 8
- 229910001220 stainless steel Inorganic materials 0.000 description 7
- 239000010935 stainless steel Substances 0.000 description 7
- 239000000126 substance Substances 0.000 description 6
- 230000003749 cleanliness Effects 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 241001417490 Sillaginidae Species 0.000 description 4
- 229910052684 Cerium Inorganic materials 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000000280 densification Methods 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- AVXURJPOCDRRFD-UHFFFAOYSA-N Hydroxylamine Chemical class ON AVXURJPOCDRRFD-UHFFFAOYSA-N 0.000 description 1
- 229910000979 O alloy Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- XOCUXOWLYLLJLV-UHFFFAOYSA-N [O].[S] Chemical compound [O].[S] XOCUXOWLYLLJLV-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000004056 waste incineration Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
-
- 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
- C22C38/02—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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention provides a method for producing high-anticorrosive high-nitrogen super austenitic stainless steel by means of bottom blowing of nitrogen through a vacuum induction furnace, and belongs to the technical field of high-nitrogen steel smelting. The method includes the steps that burdening is performed and smelting pressure is calculated; charging is performed; powering up is conducted for heating after vacuum pumping reaches within 5Pa; the nitrogen is connected in to a smelting pressure after melting down, and bottom blowing of the nitrogen is performed for alloying; nitralloy, a deoxidizing agent and a desulfurizing agent are added in sequence; and the nitrogen is filled to 0.08-0.095MPa, and the molten steel temperature is controlled to be 1460-1530 for casting. According to the method, an efficient and low-cost nitrogen adding mode for bottom blowing of the nitrogen and adding of the nitralloy is adopted, the reasonable deoxidation and desulfurization process, the casting pressure and the degree of superheat are matched, and therefore a technical guarantee is provided for developing the high-anticorrosive high-nitrogen super austenitic stainless steel which is high in nitrogen content, accurate and controllable, low in segregation, free of pores, high in degree of purity and excellent in performance.
Description
Technical field
The present invention relates to high nitrogen steel field of smelting, more particularly to a kind of anti-corrosion using vaccum sensitive stove bottom blowing nitrogen production height
The method of high-nitrogen super austenitic stainless steel.
Background technology
Nitrogen as strong interstitial element add stainless steel in, by with other alloying elements（Chromium, molybdenum etc.）Synergy, no
Intensity, toughness, creep ability and the wearability of steel can be only effectively improved, the decay resistance of steel be also significantly improved, in Austria
It is widely used in a series of steel such as family name's body stainless steel, two phase stainless steel.According to the difference of nitrogen content, can be by nitrogenous Austria
Family name's body stainless steel is divided into control nitrogen type（Nitrogen content 0.05%～0.10%）, middle nitrogen type（Nitrogen content 0.10%～0.40%）And high nitrogen type
（Nitrogen content is more than 0.40%）.High anti-corrosion high-nitrogen super austenitic stainless steel contains higher chromium, molybdenum, nickel, nitrogen, with high-strength
Toughness, yield strength is about high than common austenitic stainless steel by 50～100%；Wash away in high-concentration chlorine ion medium, seawater, low speed
In etc. exceedingly odious Service Environment, with the local corrosions such as excellent general corrosion resistance, spot corrosion and stress corrosion resistant ability.Certain
The abros such as the C276 that kinds can be splendid with corrosion resistance a little typically and titanium alloy compare favourably, and cost advantage is aobvious
Write, be widely used in petrochemical industry, environmental protection（Flue gas desulfurization, waste incineration etc.）, the extreme harshness Service Environment such as desalinization.
For the higher high-nitrogen super austenitic stainless steel of nitrogen content, in its preparation process nitrogen alloying mode and
The precise control of nitrogen is most important.The common method of molten steel nitrogen pick-up mainly has：Nitro-alloy is added to molten liquid steel（Such as High Purity Nitrogen
Change chromium, nitrogenized manganese etc.）, the method combined using nitrogen gas nitrogen alloying or two ways.Though add nitro-alloy nitrogen pick-up
So mode is simple, easy to operate, but because nitrogen content is higher, reacts violent in adition process, and " splash " phenomenon occurs when serious,
And nitrogen in steel content is wayward.In addition, nitro-alloy is expensive, it is relatively costly by nitro-alloy nitrogen pick-up merely.Therefore,
Replace nitrogenized manganese or high purity silicon nitride chromium etc. to carry out nitrogen alloying using cheap nitrogen to receive much concern.But using in smelting vessel
Inflated with nitrogen carries out the nitrogen alloying mode of molten steel surface carburization, and reaction rate is slow, and the nitrogen pick-up cycle is long, even if there is convection current in molten steel
Smelt in the induction furnace of motion, the speed of molten steel nitriding is nor quickly.And from smelting equipment bottom porous plug to molten steel in blow
Enter nitrogen gas nitrogen alloying, the nitrogen bubble of disperse can substantially improve the dynamic conditions of nitrogen alloying, increase solution-air contact surface
Product, can promote the quick nitrogen pick-up of molten steel.Therefore, the mode for adopting bottom blowing nitrogen gas nitrogen alloying is carried for the smelting of high nitrogen stainless steel
A low cost, efficient approach are supplied.
Have smelting process simple, efficient using vaccum sensitive stove bottom blowing nitrogen alloying small-scale production high nitrogen stainless steel
And advantage with low cost, especially for the high anti-corrosion high-nitrogen super austenitic stainless steel that added value is high, demand batch is little for,
With more higher market flexibility ratio.But in high anti-corrosion high-nitrogen super austenitic stainless steel production process, nitrogen alloying process
Proper Match, in molten steel in the precise control and casting cycle of nitrogen content the degree of superheat and pressure reasonable control, it is rational de-
Oxygen desulfurization method, is for obtaining that nitrogen content is higher and controllable precise, low segregation, pore-free, high cleanliness, high performance high nitrogen
Super austenitic stainless steel is most important.
The content of the invention
Based on problems of the prior art, it is an object of the invention to provide a kind of utilize vaccum sensitive stove bottom blowing nitrogen
The method for carrying out producing high anti-corrosion high-nitrogen super austenitic stainless steel, low cost of manufacture, stainless steel nitrogen content is higher and accurately may be used
Control, low segregation, pore-free, high cleanliness, excellent performance.
To achieve the object of the present invention, one kind of the invention is surpassed using the high anti-corrosion high nitrogen of vaccum sensitive stove bottom blowing nitrogen production
The method of level austenitic stainless steel comprises the steps：
S1, charging：Ingot iron, crome metal, metal molybdenum, metallic nickel, cathode copper, manganese metal, industrial silicon are put into into sensing
In the crucible of stove, high purity silicon nitride chromium, electrolytic aluminium, nickel magnesium alloy and rare earth are placed in feeding chamber；
It is S2, load melting：Below 5Pa will be evacuated in induction furnace, and energization is warming up to furnace charge in induction furnace and all melts
Change；
S3, nitrogen alloying：After furnace charge in vaccum sensitive stove is melting down, nitrogen is passed through to pressure p is smelted, by controlling power
Maintain 1500～1560 DEG C of smelting temperature, from furnace bottom porous plug to stove in be passed through nitrogen and carry out bottom blowing stirring melting, bottom blowing nitrogen
0.05～0.20Nm of throughput3/ h, 15～25min of bottom blowing time；Wherein, smelt pressure p and press the calculating of column count formula：
[%Ni]+3.5 × 10 of M=0.13 [%N]+0.118 [%C]+0.043 [%Si]+0.011-5[%Ni]2
-0.024[%Mn]+3.2×10-5[%Mn]2-0.01[%Mo]+7.9×10-5[%Mo]2
-0.048[%Cr]+3.5×10-4[%Cr]2
In formula：P is smelting pressure, pθFor standard atmospheric pressure, T is smelting temperature；
Nitrogen is actually added into percentage by weight (wt%) in raw materials for metallurgyN1It is calculated as follows：
(wt%)N1=（0.1～0.2）(wt%)N
In formula, (wt%)N1Represent that nitrogen is actually added into percentage by weight in raw materials for metallurgy, (wt%)NRepresent high anti-corrosion high nitrogen
The percentage by weight of nitrogen in super austenitic stainless steel target component；
S4, deoxidization desulfuration：After stopping bottom blowing nitrogen, high purity silicon nitride chromium is added to carry out further nitrogen alloying into stove, so
Adding electrolytic aluminium, nickel magnesium alloy, rare earth successively afterwards carries out deep deoxidation and deep desulfurization process；Wherein, weight of chromium in high purity silicon nitride chromium
Percentage >=85%, weight nitroxide percentage >=10%, electrolytic aluminium addition is 0.6～0.8kg/t, and the nickel magnesium alloy containing magnesium 20% adds
Dosage is 0.8～1.2kg/t, and rare earth addition is 0.5～1kg/t；
S5, casting：Nitrogen is filled with into vaccum sensitive stove to the 0.08～0.095MPa of pressure that casts, molten steel temperature is controlled
1460～1530 DEG C are cast；After casting terminates, cooling, vacuum breaker takes out ingot casting.
Preferably, the target austenitic stainless steel steel grades of the smelting are：C：≤0.02%、Si：≤0.5%、Mn：
2.0～4.0%, Cr：24.0～25.0%, Ni：21.0～23.0%, Mo：7.0～8.0%, Cu：0.3～0.6%, N：0.45～
0.55%、S：≤0.005%、P：≤0.03%、Fe：Surplus.
Compared with prior art, its advantage for projecting is the present invention：
（1）It is cost-effective by the way of vaccum sensitive stove bottom blowing nitrogen alloying, substantially improve the power of nitrogen alloying
Condition, promotes the quick nitrogen pick-up of molten steel；
（2）After bottom blowing nitrogen terminates, by adding nitro-alloy nitrogen content in liquid steel is further increased, be conducive to acquisition nitrogen to contain
Measure higher and accurate subject alloy；
（3）The mode for being combined addition using electrolytic aluminium, nickel magnesium and rare earth carries out deep deoxidation, deep desulfurization, is conducive to obtaining low
The high cleanliness subject alloy of oxygen sulfur content；
（4）Nitrogen charging is operated and is conducive to obtaining the more high and low segregation of nitrogen content, nothing using low overheat casting before cast
The subject alloy of pore.
Description of the drawings
By detailed description below in conjunction with the accompanying drawings, the aforesaid and other objects, features and advantages of the present invention will become
Obviously.Wherein：
Fig. 1 show a kind of technological process of method for producing high anti-corrosion high-nitrogen super austenitic stainless steel of the present invention
Figure.
Specific embodiment
The technological principle of the present invention is calculated first with nitrogen solubility model and smelts pressure, then in vaccum sensitive stove
Middle employing bottom blowing nitrogen carries out gas alloying.Because the simple mode by bottom blowing nitrogen is unable to reach target nitrogen content, because
After this bottom blowing nitrogen terminates, add the nitrogen content that nitro-alloy is further improved in molten steel, while optimize deoxidization desulfuration technique, and
Proper Match is cast the technological parameter such as pressure and the degree of superheat, so as to obtain higher nitrogen content and controllable precise, low segregation, without gas
Hole, high cleanliness, the high anti-corrosion high-nitrogen super austenitic stainless steel of excellent performance.
Below in conjunction with the accompanying drawings 1 processing step and specific embodiment describe the specific embodiment of the present invention, but this in detail
The specific embodiment of invention is not limited to following embodiments.
In illustrated embodiment of the present invention, smelting equipment is 500kg vaccum sensitive stoves, and final vacuum is 0.1Pa, power supply work(
Rate is 350kW, and frequency is 1000Hz, batch 380kg.Smelting steel grade is high anti-corrosion high-nitrogen super austenitic stainless steel
24.5Cr22Ni7.3Mo0.5N
The main component of raw materials for metallurgy used is shown in Table 1 in illustrated embodiment of the present invention.
The raw materials for metallurgy main component of table 1/wt%
Smelt the computing formula of pressure p 1.：
[%Ni]+3.5 × 10 of M=0.13 [%N]+0.118 [%C]+0.043 [%Si]+0.011-5[%Ni]2
-0.024[%Mn]+3.2×10-5[%Mn]2-0.01[%Mo]+7.9×10-5[%Mo]2
-0.048[%Cr]+3.5×10-4[%Cr]2
In formula：P is smelting pressure, pθFor standard atmospheric pressure, T is smelting temperature.
Nitrogen is actually added into percentage by weight (wt%) in raw materials for metallurgyN1Computing formula 2.：
(wt%)N1=（0.1～0.2）(wt%)N
In formula, (wt%)N1Represent that nitrogen is actually added into percentage by weight in raw materials for metallurgy, (wt%)NRepresent high anti-corrosion high nitrogen
The percentage by weight of nitrogen in super austenitic stainless steel target component.
Embodiment one
Using the high anti-corrosion high-nitrogen super austenitic stainless steel 24.5Cr22Ni7.3Mo0.5N of 500kg vacuum induction furnace smeltings,
Its Composition Control scope and control targe are as shown in table 2.
The super austenitic stainless steel 24.5Cr22Ni7.3Mo0.5N Composition Controls scope of table 2 and control targe（wt%）
Comprise the following steps that：
（1）Dispensing and smelting calculation of pressure
According to about 1550 DEG C of steel grade target component and smelting temperature in table 2,1. it is calculated according to formula：Smelt pressure p
For 0.076MPa；2. it is calculated according to formula：Nitrogen is actually added into weight percentage (wt%) in raw materials for metallurgyN1For
0.046%；It is calculated the one stove super austenitic stainless steel 24.5Cr22Ni7.3Mo0.5N needed raw materials weight such as institute of table 3 of smelting
Show.The addition of deoxidier and desulfurizing agent is respectively electrolytic aluminium 95g, nickel magnesium alloy 418g, cerium 228g.
Table 3 smelts a stove super austenitic stainless steel 24.5Cr22Ni7.3Mo0.5N and needs the weight of raw material
（2）Charging：Ingot iron, crome metal, metal molybdenum, metallic nickel, cathode copper, manganese metal, industrial silicon are put into into sensing
In the crucible of stove, high purity silicon nitride chromium, electrolytic aluminium, nickel magnesium alloy and rare earth are placed in feeding chamber.
（3）It is load melting：4.6Pa will be evacuated in induction furnace, and energization is warming up to furnace charge in induction furnace and all melts.
（4）Nitrogen alloying and deoxidization desulfuration：After furnace charge in vaccum sensitive stove is melting down, nitrogen is passed through to smelting pressure
0.076MPa, by controlling power 1550 DEG C of smelting temperature is maintained, from furnace bottom porous plug to stove in be passed through nitrogen and carry out bottom blowing
Stir-melting, bottom blowing nitrogen flow 0.08Nm3/ h, bottom blowing time 18min.After stopping bottom blowing nitrogen, into stove High Purity Nitrogen is added
Changing chromium carries out nitrogen alloying, and electrolytic aluminium, nickel magnesium alloy, rare earth are then added successively carries out deep deoxidation and deep desulfurization process.
（5）Casting：Nitrogen is filled with into vaccum sensitive stove to the pressure 0.082MPa that casts, 1530 DEG C of temperature of control is poured
Casting；After casting terminates, pressure release is cooled down, take out ingot casting.
Ingot structure densification nitrogen-free gas hole defect, its chemical composition is as shown in table 4.
The chemical composition of the finished steel of table 4（wt%）
Embodiment two
Using the high anti-corrosion high-nitrogen super austenitic stainless steel 24.5Cr22Ni7.3Mo0.5N of 500kg vacuum induction furnace smeltings,
Its Composition Control scope and control targe are as shown in table 5.
The super austenitic stainless steel 24.5Cr22Ni7.3Mo0.5N Composition Controls scope of table 5 and control targe（wt%）
Comprise the following steps that：
（1）Dispensing and smelting calculation of pressure
According to about 1530 DEG C of steel grade target component and smelting temperature in table 5,1. it is calculated according to formula：Smelt pressure p
For 0.085MPa；2. it is calculated according to formula：Nitrogen is actually added into weight percentage (wt%) in raw materials for metallurgyN1For
0.075%；It is calculated the one stove super austenitic stainless steel 24.5Cr22Ni7.3Mo0.5N needed raw materials weight such as institute of table 6 of smelting
Show.The addition of deoxidier and desulfurizing agent is respectively electrolytic aluminium 131g, nickel magnesium alloy 380g, cerium 304g.
Table 6 smelts a stove super austenitic stainless steel 24.5Cr22Ni7.3Mo0.5N and needs the weight of raw material
（2）Charging：Ingot iron, crome metal, metal molybdenum, metallic nickel, cathode copper, manganese metal, industrial silicon are put into into sensing
In the crucible of stove, high purity silicon nitride chromium, electrolytic aluminium, nickel magnesium alloy and rare earth are placed in feeding chamber.
（3）It is load melting：3.5Pa will be evacuated in induction furnace, and energization is warming up to furnace charge in induction furnace and all melts.
（4）Nitrogen alloying and deoxidization desulfuration：After furnace charge in vaccum sensitive stove is melting down, nitrogen is passed through to smelting pressure
0.085MPa, by controlling power 1530 DEG C of smelting temperature is maintained, from furnace bottom porous plug to stove in be passed through nitrogen and carry out bottom blowing
Stir-melting, bottom blowing nitrogen flow 0.12Nm3/ h, bottom blowing time 20min.After stopping bottom blowing nitrogen, into stove High Purity Nitrogen is added
Changing chromium carries out nitrogen alloying, and electrolytic aluminium, nickel magnesium alloy, rare earth are then added successively carries out deep deoxidation and deep desulfurization process.
（5）Casting：Nitrogen is filled with into vaccum sensitive stove to the pressure 0.09MPa that casts, 1510 DEG C of temperature of control is poured
Casting；After casting terminates, pressure release is cooled down, take out ingot casting.
Ingot structure densification nitrogen-free gas hole defect, its chemical composition is as shown in table 7.
The chemical composition of the finished steel of table 7（wt%）
Embodiment three
Using the high anti-corrosion high-nitrogen super austenitic stainless steel 24.5Cr22Ni7.3Mo0.5N of 500kg vacuum induction furnace smeltings,
Its Composition Control scope and control targe are as shown in table 8.
The super austenitic stainless steel 24.5Cr22Ni7.3Mo0.5N Composition Controls scope of table 8 and control targe（wt%）
Comprise the following steps that：
（1）Dispensing and smelting calculation of pressure
According to about 1510 DEG C of steel grade target component and smelting temperature in table 8,1. it is calculated according to formula：Smelt pressure p
For 0.09MPa；2. it is calculated according to formula：Nitrogen is actually added into weight percentage (wt%) in raw materials for metallurgyN1For
0.108%；It is calculated the one stove super austenitic stainless steel 24.5Cr22Ni7.3Mo0.5N needed raw materials weight such as institute of table 9 of smelting
Show.The addition of deoxidier and desulfurizing agent is respectively electrolytic aluminium 167g, nickel magnesium alloy 380g, cerium 380g.
Table 9 smelts a stove super austenitic stainless steel 24.5Cr22Ni7.3Mo0.5N and needs the weight of raw material
（2）Charging：Ingot iron, crome metal, metal molybdenum, metallic nickel, cathode copper, manganese metal, industrial silicon are put into into sensing
In the crucible of stove, high purity silicon nitride chromium, electrolytic aluminium, nickel magnesium alloy and rare earth are placed in feeding chamber.
（3）It is load melting：1.2Pa will be evacuated in induction furnace, and energization is warming up to furnace charge in induction furnace and all melts.
（4）Nitrogen alloying and deoxidization desulfuration：After furnace charge in vaccum sensitive stove is melting down, nitrogen is passed through to smelting pressure
0.09MPa, by controlling power 1510 DEG C of smelting temperature is maintained, from furnace bottom porous plug to stove in be passed through nitrogen and carry out bottom blowing and stir
Mix melting, bottom blowing nitrogen flow 0.18Nm3/ h, bottom blowing time 21min.After stopping bottom blowing nitrogen, into stove high purity silicon nitride is added
Chromium carries out nitrogen alloying, and electrolytic aluminium, nickel magnesium alloy, rare earth are then added successively carries out deep deoxidation and deep desulfurization process.
（5）Casting：Nitrogen is filled with into vaccum sensitive stove to the pressure 0.095MPa that casts, 1480 DEG C of temperature of control is poured
Casting；After casting terminates, pressure release is cooled down, take out ingot casting.
Ingot structure densification nitrogen-free gas hole defect, its chemical composition is as shown in table 10.
The chemical composition of the finished steel of table 10（wt%）
The present invention proposes a kind of more reasonable, efficient, economic nitrogen alloying method, is that exploitation nitrogen content is higher and essence
Really controllable, low segregation, pore-free, high cleanliness, the high anti-corrosion high-nitrogen super austenitic stainless steel of excellent performance provide technology and protect
Barrier.
Described embodiment is the invention is not limited in, those skilled in the art is public affairs in the spirit without departing from the present invention
In the range of opening, can still make some amendments or change, thus the scope that limited with claims of the scope of the present invention as
It is accurate.
Claims (4)
1. a kind of method for producing high anti-corrosion high-nitrogen super austenitic stainless steel, it comprises the steps：
S1, charging：Ingot iron, crome metal, metal molybdenum, metallic nickel, cathode copper, manganese metal, industrial silicon are put into into induction furnace
In crucible, high purity silicon nitride chromium, electrolytic aluminium, nickel magnesium alloy and rare earth are placed in feeding chamber；
It is S2, load melting：Below 5Pa will be evacuated in induction furnace, and energization is warming up to furnace charge in induction furnace and all melts；
S3, nitrogen alloying：After furnace charge in vaccum sensitive stove is melting down, nitrogen is passed through to pressure p is smelted, maintained by controlling power
1500～1560 DEG C of smelting temperature, from furnace bottom porous plug to stove in be passed through nitrogen and carry out bottom blowing stirring melting, bottom blowing nitrogen stream
0.05～0.20Nm of amount3/ h, 15～25min of bottom blowing time；Wherein, smelt pressure p and press the calculating of column count formula：
[%Ni]+3.5 × 10 of M=0.13 [%N]+0.118 [%C]+0.043 [%Si]+0.011-5[%Ni]2
- 0.024 [%Mn]+3.2 × 10-5[%Mn]2- 0.01 [%Mo]+7.9 × 10-5[%Mo]2
- 0.048 [%Cr]+3.5 × 10-4[%Cr]2
In formula：P is smelting pressure, pθFor standard atmospheric pressure, T is smelting temperature；
Nitrogen is actually added into percentage by weight (wt%) in raw materials for metallurgyN1It is calculated as follows：
(wt%)N1=(0.1～0.2) is (wt%)N
In formula, (wt%)N1Represent that nitrogen is actually added into percentage by weight in raw materials for metallurgy, (wt%)NRepresent that high anti-corrosion high nitrogen surpasses
The percentage by weight of nitrogen in level austenitic stainless steel target component；
S4, deoxidization desulfuration：After stopping bottom blowing nitrogen, high purity silicon nitride chromium is added to carry out further nitrogen alloying, Ran Houyi into stove
Secondary addition electrolytic aluminium, nickel magnesium alloy, rare earth carry out deep deoxidation and deep desulfurization process；
S5, casting：Be filled with into vaccum sensitive stove nitrogen to cast 0.08～0.095MPa of pressure, control molten steel temperature 1460～
1530 DEG C are cast；After casting terminates, cooling, vacuum breaker takes out ingot casting.
2. a kind of method for producing high anti-corrosion high-nitrogen super austenitic stainless steel as claimed in claim 1, it is characterised in that
In step S4, electrolytic aluminium addition is 0.6～0.8kg/t, and the nickel magnesium alloy addition containing magnesium 20% is 0.8～1.2kg/t, dilute
Native addition is 0.5～1kg/t.
3. a kind of method for producing high anti-corrosion high-nitrogen super austenitic stainless steel as claimed in claim 1, it is characterised in that
In step S4, percentage by weight >=85% of chromium, percentage by weight >=10% of nitrogen in the high purity silicon nitride chromium.
4. a kind of method for producing high anti-corrosion high-nitrogen super austenitic stainless steel as claimed in claim 1, it is characterised in that institute
The target austenitic stainless steel steel grades for stating smelting are：C：≤ 0.02%, Si：≤ 0.5%, Mn：2.0～4.0%, Cr：
24.0～25.0%, Ni：21.0～23.0%, Mo：7.0～8.0%, Cu：0.3～0.6%, N：0.45～0.55%, S：≤
0.005%th, P：≤ 0.03%, Fe：Surplus.
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Address after: 225721 No.1, west side of Xingda Avenue, Dainan Town, Xinghua City, Taizhou City, Jiangsu Province Patentee after: Jiangsu Xinghuo Special Steel Group Co.,Ltd. Patentee after: Northeastern University Address before: 225721 No.1, west side of Xingda Avenue, Dainan Town, Xinghua City, Taizhou City, Jiangsu Province Patentee before: JIANGSU XIHU SPECIAL STEEL Co.,Ltd. Patentee before: Northeastern University |