CN106636858B - A kind of method for producing high anti-corrosion high-nitrogen super austenitic stainless steel - Google Patents
A kind of method for producing high anti-corrosion high-nitrogen super austenitic stainless steel Download PDFInfo
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- CN106636858B CN106636858B CN201610938389.3A CN201610938389A CN106636858B CN 106636858 B CN106636858 B CN 106636858B CN 201610938389 A CN201610938389 A CN 201610938389A CN 106636858 B CN106636858 B CN 106636858B
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 265
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 147
- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims abstract description 37
- 238000005260 corrosion Methods 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 238000007664 blowing Methods 0.000 claims abstract description 33
- 238000003723 Smelting Methods 0.000 claims abstract description 31
- 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 21
- 238000000034 method Methods 0.000 claims abstract description 21
- 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
- 229910052804 chromium Inorganic materials 0.000 claims description 24
- 239000011651 chromium Substances 0.000 claims description 24
- 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
- 230000006698 induction Effects 0.000 claims description 15
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 13
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 13
- 150000002910 rare earth metals Chemical class 0.000 claims description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 229910052759 nickel Inorganic materials 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
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 9
- 229910052710 silicon Inorganic materials 0.000 claims description 9
- 230000023556 desulfurization Effects 0.000 claims description 8
- 229910052748 manganese Inorganic materials 0.000 claims description 8
- 239000011572 manganese Substances 0.000 claims description 8
- 229910052750 molybdenum Inorganic materials 0.000 claims description 8
- 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
- 238000004364 calculation method Methods 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
- 239000000654 additive Substances 0.000 claims description 5
- 230000000996 additive effect Effects 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 238000010792 warming Methods 0.000 claims description 5
- 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
- 229910045601 alloy Inorganic materials 0.000 abstract description 10
- 239000000956 alloy Substances 0.000 abstract description 10
- 230000003749 cleanliness Effects 0.000 abstract description 6
- 238000005204 segregation Methods 0.000 abstract description 6
- 239000003795 chemical substances by application Substances 0.000 abstract description 4
- 230000003009 desulfurizing effect Effects 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 13
- 241001417490 Sillaginidae Species 0.000 description 7
- 229910001220 stainless steel Inorganic materials 0.000 description 7
- 239000010935 stainless steel Substances 0.000 description 7
- 241001062472 Stokellia anisodon Species 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 229910052684 Cerium Inorganic materials 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
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 239000013535 sea water 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
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 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
- 230000002195 synergetic effect Effects 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
Abstract
The present invention proposes a kind of method of high nitrogen steel technical field of smelting using the high anti-corrosion high-nitrogen super austenitic stainless steel of vaccum sensitive stove bottom blowing nitrogen production, it includes step：Dispensing simultaneously calculates smelting pressure；Charging；Be powered heating after being evacuated within 5Pa；Nitrogen is passed through after melting down to smelting pressure, bottom blowing nitrogen alloying；Sequentially add nitro-alloy, deoxidier and desulfurizing agent；Inflated with nitrogen to 0.08~0.095MPa, 1460~1530 DEG C of control molten steel temperature is cast.The method of the present invention is using bottom blowing nitrogen and adds efficient, the inexpensive nitrogen pick-up mode of nitro-alloy, match rational deoxidization desulfuration technique, the casting pressure and degree of superheat, for exploitation nitrogen content is higher and controllable precise, low segregation, pore-free, high cleanliness, excellent performance high anti-corrosion high-nitrogen super austenitic stainless steel technical guarantee is provided.
Description
Technical field
It is more particularly to a kind of anti-corrosion using vaccum sensitive stove bottom blowing nitrogen production height the present invention relates to high nitrogen steel field of smelting
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.）Synergistic effect, no
Intensity, toughness, creep ability and the wearability of steel can be only effectively improved, the corrosion resistance of steel is 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., can be by nitrogenous Austria according to the difference of nitrogen content
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, has high-strength
Toughness, yield strength are about higher than common austenitic stainless steel by 50~100%；Washed away in high-concentration chlorine ion medium, seawater, low speed
Etc. in exceedingly odious Service Environment, there is local corrosion and the stress corrosion resistant abilities such as excellent general corrosion resistance, spot corrosion.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 shown
Write, be widely used in petrochemical industry, environmental protection（Flue gas desulfurization, waste incineration etc.）, the extreme harsh Service Environment such as sea water desalination.
For the higher high-nitrogen super austenitic stainless steel of nitrogen content, in its preparation process nitrogen alloying mode and
The accurately 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 that nitrogen alloying or two ways be combined is carried out using nitrogen.Though add nitro-alloy nitrogen pick-up
Right mode is simple, easy to operate, but reacts violent since nitrogen content is higher, in adition process, and " splash " phenomenon occurs when serious,
And nitrogen in steel content is difficult to control.In addition, nitro-alloy is expensive, it is higher by nitro-alloy nitrogen pick-up cost 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 nitrogen pick-up cycle length, even in molten steel, there are convection current
Smelted in the induction furnace of movement, the speed of molten steel nitriding is nor quickly.And blown from smelting equipment bottom porous plug into molten steel
Enter nitrogen and carry out 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 that bottom blowing nitrogen carries out nitrogen alloying is used to be carried for the smelting of high nitrogen stainless steel
A low cost, efficient approach are supplied.
There is smelting process simply, efficiently using vaccum sensitive stove bottom blowing nitrogen alloying small-scale production high nitrogen stainless steel
And advantage of low cost, for the high anti-corrosion high-nitrogen super austenitic stainless steel that added value is high, demand batch is small,
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 accurate control of nitrogen content and casting cycle 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, the object of the present invention is to provide one kind to utilize vaccum sensitive stove bottom blowing nitrogen
The method for carrying out the high anti-corrosion high-nitrogen super austenitic stainless steel of production, manufacture cost is low, and 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 includes the following steps：
S1, charging：Ingot iron, crome metal, metal molybdenum, metallic nickel, cathode copper, manganese metal, industrial silicon are put 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
1500~1560 DEG C of smelting temperature is maintained, nitrogen is passed through into stove from furnace bottom porous plug carries out bottom blowing stirring melting, bottom blowing nitrogen
0.05~0.20Nm of throughput3/ h, 15~25min of bottom blowing time；Wherein, pressure p is smelted to calculate by following calculation formula：
+ 0.011 [%Ni]+3.5 × 10 of M=0.13 [%N]+0.118 [%C]+0.043 [%Si]-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 to smelt 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, the further nitrogen alloying of high purity silicon nitride chromium progress is added into stove, so
Add electrolytic aluminium, nickel magnesium alloy, rare earth successively afterwards and carry 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 additive amount are 0.6~0.8kg/t, and the nickel magnesium alloy containing magnesium 20% adds
Dosage is 0.8~1.2kg/t, and rare earth additive amount 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, controls molten steel temperature
1460~1530 DEG C are cast；After casting, 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, the present invention its advantage protruded is：
（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, further increase nitrogen content in liquid steel by adding nitro-alloy, be conducive to acquisition nitrogen and contain
Measure higher and accurate subject alloy；
（3）Deep deoxidation, deep desulfurization are carried out using the mode of electrolytic aluminium, nickel magnesium and the compound addition of rare earth, is conducive to obtain low
The high cleanliness subject alloy of oxygen sulfur content；
（4）Nitrogen charging is operated and is conducive to obtain the more high and low segregation of nitrogen content, nothing using low overheat casting before cast
The subject alloy of stomata.
Brief description of the drawings
By detailed description below in conjunction with the accompanying drawings, the present invention is foregoing will to be become with other objects, features and advantages
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.
Embodiment
The technological principle of the present invention is calculated first with nitrogen solubility model and smelts pressure, then in vaccum sensitive stove
It is middle that gas alloying is carried out using bottom blowing nitrogen.Target nitrogen content is unable to reach by the mode of bottom blowing nitrogen due to simple, because
After this bottom blowing nitrogen, addition nitro-alloy further improves the nitrogen content in molten steel, while optimizes 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.
1 processing step and the specific embodiment embodiment that the present invention will be described in detail below in conjunction with the accompanying drawings, but this
The embodiment of invention is not limited to following embodiments.
In illustrated embodiment of the present invention, smelting equipment is 500kg vaccum sensitive stoves, final vacuum 0.1Pa, power supply work(
Rate is 350kW, frequency 1000Hz, batch 380kg.Steel grade is smelted for 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.
1 raw materials for metallurgy main component of table/wt%
Smelt the calculation formula of pressure p 1.：
+ 0.011 [%Ni]+3.5 × 10 of M=0.13 [%N]+0.118 [%C]+0.043 [%Si]-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 to smelt pressure, pθFor standard atmospheric pressure, T is smelting temperature.
Nitrogen is actually added into percentage by weight (wt%) in raw materials for metallurgyN1Calculation 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.
2 super austenitic stainless steel 24.5Cr22Ni7.3Mo0.5N Composition Controls scope of table and control targe（wt%）
Comprise the following steps that：
（1）Dispensing is with smelting calculation of pressure
According to about 1550 DEG C of steel grade target component in table 2 and smelting temperature, 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 and smelts the raw material weight such as institute of table 3 needed for a stove super austenitic stainless steel 24.5Cr22Ni7.3Mo0.5N
Show.The addition of deoxidier and desulfurizing agent is respectively electrolytic aluminium 95g, nickel magnesium alloy 418g, cerium 228g.
Table 3, which smelts a stove super austenitic stainless steel 24.5Cr22Ni7.3Mo0.5N, 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 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 is powered and is warming up to furnace charge all fusings in induction furnace.
（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 to maintain 1550 DEG C of smelting temperature, is passed through nitrogen into stove from furnace bottom porous plug and carries out bottom blowing
Stir-melting, bottom blowing nitrogen flow 0.08Nm3/ h, bottom blowing time 18min.After stopping bottom blowing nitrogen, High Purity Nitrogen is added into stove
Change chromium and carry out nitrogen alloying, then add electrolytic aluminium, nickel magnesium alloy, rare earth successively and carry out deep deoxidation and deep desulfurization process.
（5）Casting：Nitrogen to the pressure 0.082MPa that casts, 1530 DEG C of temperature of control is filled with into vaccum sensitive stove to be poured
Casting；After casting, pressure release is cooled down, takes out ingot casting.
Ingot structure densification nitrogen-free gas hole defect, its chemical composition are as shown in table 4.
The chemical composition of 4 finished steel of table（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.
5 super austenitic stainless steel 24.5Cr22Ni7.3Mo0.5N Composition Controls scope of table and control targe（wt%）
Comprise the following steps that：
（1）Dispensing is with smelting calculation of pressure
According to about 1530 DEG C of steel grade target component in table 5 and smelting temperature, 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 and smelts the raw material weight such as institute of table 6 needed for a stove super austenitic stainless steel 24.5Cr22Ni7.3Mo0.5N
Show.The addition of deoxidier and desulfurizing agent is respectively electrolytic aluminium 131g, nickel magnesium alloy 380g, cerium 304g.
Table 6, which smelts a stove super austenitic stainless steel 24.5Cr22Ni7.3Mo0.5N, 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 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 is powered and is warming up to furnace charge all fusings in induction furnace.
（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 to maintain 1530 DEG C of smelting temperature, is passed through nitrogen into stove from furnace bottom porous plug and carries out bottom blowing
Stir-melting, bottom blowing nitrogen flow 0.12Nm3/ h, bottom blowing time 20min.After stopping bottom blowing nitrogen, High Purity Nitrogen is added into stove
Change chromium and carry out nitrogen alloying, then add electrolytic aluminium, nickel magnesium alloy, rare earth successively and carry out deep deoxidation and deep desulfurization process.
（5）Casting：Nitrogen to the pressure 0.09MPa that casts, 1510 DEG C of temperature of control is filled with into vaccum sensitive stove to be poured
Casting；After casting, pressure release is cooled down, takes out ingot casting.
Ingot structure densification nitrogen-free gas hole defect, its chemical composition are as shown in table 7.
The chemical composition of 7 finished steel of table（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.
8 super austenitic stainless steel 24.5Cr22Ni7.3Mo0.5N Composition Controls scope of table and control targe（wt%）
Comprise the following steps that：
（1）Dispensing is with smelting calculation of pressure
According to about 1510 DEG C of steel grade target component in table 8 and smelting temperature, 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 and smelts the raw material weight such as institute of table 9 needed for a stove super austenitic stainless steel 24.5Cr22Ni7.3Mo0.5N
Show.The addition of deoxidier and desulfurizing agent is respectively electrolytic aluminium 167g, nickel magnesium alloy 380g, cerium 380g.
Table 9, which smelts a stove super austenitic stainless steel 24.5Cr22Ni7.3Mo0.5N, 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 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 is powered and is warming up to furnace charge all fusings in induction furnace.
（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 to maintain 1510 DEG C of smelting temperature, is passed through nitrogen progress bottom blowing into stove from furnace bottom porous plug and stirs
Mix melting, bottom blowing nitrogen flow 0.18Nm3/ h, bottom blowing time 21min.After stopping bottom blowing nitrogen, high purity silicon nitride is added into stove
Chromium carries out nitrogen alloying, then adds electrolytic aluminium, nickel magnesium alloy, rare earth successively and carries out deep deoxidation and deep desulfurization process.
（5）Casting：Nitrogen to the pressure 0.095MPa that casts, 1480 DEG C of temperature of control is filled with into vaccum sensitive stove to be poured
Casting；After casting, pressure release is cooled down, takes out ingot casting.
Ingot structure densification nitrogen-free gas hole defect, its chemical composition are as shown in table 10.
The chemical composition of 10 finished steel of table（wt%）
The present invention proposes a kind of more reasonable, efficient, economic nitrogen alloying method, higher and smart for exploitation nitrogen content
True 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.
The present invention is not limited to the described embodiments, and those skilled in the art is i.e. public in the spirit for not departing from the present invention
In the range of opening, still may make some modifications or changes, thus the scope of the present invention using the scope that claims limit as
It is accurate.
Claims (3)
1. a kind of method for producing high anti-corrosion high-nitrogen super austenitic stainless steel, the austenitic stainless steel steel grades 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；It is characterized in that, the method includes
Following steps：
S1, charging：Ingot iron, crome metal, metal molybdenum, metallic nickel, cathode copper, manganese metal, industrial silicon are put 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 is powered and is warming up to furnace charge all fusings in induction furnace；
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 to maintain
1500 ~ 1560 DEG C of smelting temperature, is passed through nitrogen into stove from furnace bottom porous plug and carries out bottom blowing stirring melting, bottom blowing nitrogen flow
0.05~0.20Nm3/ h, 15 ~ 25min of bottom blowing time；Wherein, pressure p is smelted to calculate by following calculation formula：
In formula：P is smelting pressure,For 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 super
The percentage by weight of nitrogen in austenitic stainless steel target component；
S4, deoxidization desulfuration：After stopping bottom blowing nitrogen, the further nitrogen alloying of high purity silicon nitride chromium progress, Ran Houyi are added 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, cooling, vacuum breaker takes out ingot casting.
A kind of 2. 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 additive amount is 0.6 ~ 0.8kg/t, and the nickel magnesium alloy additive amount containing magnesium 20% is 0.8 ~ 1.2kg/t, rare earth
Additive amount is 0.5 ~ 1kg/t.
A kind of 3. 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.
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| CN107805686A (en) * | 2017-11-16 | 2018-03-16 | 泊头市兴达汽车模具制造有限公司 | A kind of high alloy steelmaking furnace bottom blowing nitrogen reinforcement process |
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| CN112695151B (en) * | 2020-12-18 | 2022-01-25 | 东北大学 | Method for obtaining solidification pressure required by preparing high-nitrogen austenitic stainless steel through pressure induction and preparation method |
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| CN113215478B (en) * | 2021-05-14 | 2022-03-04 | 东北大学 | Method for improving high-temperature oxidation resistance of super stainless steel |
| CN114182161B (en) * | 2021-11-22 | 2022-08-09 | 华北理工大学 | Method for producing high-nitrogen high-manganese steel by quickly solidifying molten steel and inhibiting nitrogen from escaping |
| CN115058632B (en) * | 2022-06-20 | 2023-05-12 | 东北大学 | Method for improving solidification structure of super austenitic stainless steel |
| CN115896601A (en) * | 2022-11-10 | 2023-04-04 | 上海相济新材料科技有限公司 | Manufacturing method of high-purity high-nitrogen austenitic stainless steel |
| CN115786636A (en) * | 2022-12-15 | 2023-03-14 | 河钢股份有限公司 | Method for smelting high-purity iron-chromium-aluminum alloy by vacuum induction furnace |
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