CN117187714A - Super austenitic stainless steel with low Mo segregation - Google Patents
Super austenitic stainless steel with low Mo segregation Download PDFInfo
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- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims abstract description 78
- 238000005204 segregation Methods 0.000 title claims abstract description 50
- 229910052727 yttrium Inorganic materials 0.000 claims abstract description 35
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 23
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 13
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 8
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 4
- -1 marine engineering Substances 0.000 claims description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 2
- 239000003245 coal Substances 0.000 claims description 2
- 239000003546 flue gas Substances 0.000 claims description 2
- 239000003345 natural gas Substances 0.000 claims description 2
- 239000003208 petroleum Substances 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 description 26
- 230000007797 corrosion Effects 0.000 description 23
- 238000005260 corrosion Methods 0.000 description 23
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 18
- 230000000052 comparative effect Effects 0.000 description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 16
- 239000011733 molybdenum Substances 0.000 description 15
- 238000012360 testing method Methods 0.000 description 15
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 14
- 229910001220 stainless steel Inorganic materials 0.000 description 10
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 9
- 238000009826 distribution Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 9
- 239000010935 stainless steel Substances 0.000 description 9
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 9
- 239000011651 chromium Substances 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 7
- 229910001566 austenite Inorganic materials 0.000 description 7
- 229910052759 nickel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- 239000010703 silicon Substances 0.000 description 6
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 5
- 229910052748 manganese Inorganic materials 0.000 description 5
- 239000011572 manganese Substances 0.000 description 5
- 239000011574 phosphorus Substances 0.000 description 5
- 239000011593 sulfur Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910021386 carbon form Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 229910001039 duplex stainless steel Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001105 martensitic stainless steel Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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Abstract
The invention relates to a low Mo segregation super austenitic stainless steel, which comprises the following components in percentage by weight: c is less than or equal to 0.03 percent, si is less than or equal to 0.80 percent, mn:2.0-4.0%, P is less than or equal to 0.030%, S is less than or equal to 0.010%, ni:11.0-14.5%, cr:18.0-24.0%, mo:5.0-7.0%, N:0.15-0.40%, zr:0.001-0.005%, Y:0.003-0.008%, and the balance of Fe and unavoidable impurities, and the super austenitic stainless steel further satisfies the following relationship: ([ Mo)]/96)=k×([Zr]/91+[Y]/89)，k=718-1135, where [ Mo]、[Zr]、[Y]Representing the weight percentages of Mo, zr and Y respectively.
Description
Technical Field
The invention relates to a low Mo segregation super austenitic stainless steel, belongs to the field of stainless steel, and solves the problem of serious Mo element segregation in the traditional super austenitic stainless steel, and the Mo element is uniformly distributed and has uniform pitting corrosion resistance.
Background
Stainless steel is widely used in various fields of production and life, and is classified into a wide variety of stainless steel, such as ferritic stainless steel, austenitic stainless steel, martensitic stainless steel, duplex stainless steel, and the like. As the name suggests, one of the main properties of stainless steel is that it has excellent corrosion resistance. As industry advances faster, operating conditions and environments are increasingly demanding and more severe, as are corrosion resistance requirements for the relevant stainless steel structures.
In the 80 s of the 20 th century, scientists have studied the concept of super austenitic stainless steel, which is similar to the conventional austenitic stainless steel in composition, mainly different in that the super austenitic stainless steel contains Mo in a high content, usually about 6%, and aims to improve the pitting corrosion resistance of the stainless steel.
In the actual production process, it is found that the segregation is particularly easy to generate due to the high content of Mo, so that the distribution of the content of Mo in the same super austenitic stainless steel product is uneven, and the segregation of Mo element can cause the uneven pitting corrosion resistance of the super austenitic stainless steel product due to the fact that Mo is the main element for improving the pitting corrosion resistance.
Therefore, it is a technical object of the present invention to reduce segregation of Mo element in a super austenitic stainless steel having a high Mo content, and to improve uniformity of Mo content distribution so as to ensure that the super austenitic stainless steel has more uniform pitting corrosion.
Disclosure of Invention
The invention provides a super austenitic stainless steel with low Mo segregation, which is prepared by introducing trace Zr and Y into the super austenitic stainless steel, and simultaneously cooperatively controlling the content relation among Zr, Y and Mo, so that the distribution of Mo in a matrix is effectively improved, and finally the super austenitic stainless steel with low Mo segregation coefficient and uniform Mo element distribution is obtained.
The technical purpose of the invention is realized by the following means.
The invention aims to provide a low Mo segregation super austenitic stainless steel, which is characterized by comprising the following components in percentage by weight: c is less than or equal to 0.03 percent, si is less than or equal to 0.80 percent, mn:2.0-4.0%, P is less than or equal to 0.030%, S is less than or equal to 0.010%, ni:11.0-14.5%, cr:18.0-24.0%, mo:5.0-7.0%, N:0.15-0.40%, zr:0.001-0.005%, Y:0.003-0.008%, and the balance of Fe and unavoidable impurities, and the super austenitic stainless steel further satisfies the following relationship: ([ Mo)]/96)=k×([Zr]/91+[Y]/89)，k=718-1135, where [ Mo]、[Zr]、[Y]Representing the weight percentages of Mo, zr and Y respectively.
As described above, in super austenitic stainless steel, since Mo content is high, it is found that Mo element segregation is serious in the manufacturing process, mo is a main element for improving pitting corrosion resistance, and the segregation of Mo element will cause non-uniformity of pitting corrosion resistance of steel. The inventor of the invention takes the technical problems as a trigger and combines actual production conditions to carry out a large number of researches and experiments, and discovers that when trace Zr and Y are added, the problem of Mo segregation in the super austenitic stainless steel is remarkably relieved and improved, and the pitting corrosion resistance of the super austenitic stainless steel is in a more uniform state along with the uniform distribution of the Mo content.
Next, the effects of the elements in the low Mo segregation super austenitic stainless steel of the present invention will be described.
Carbon: carbon is an austenite stabilizing element, which is beneficial to improving the strength of the super austenitic stainless steel. However, carbon forms M with chromium element in stainless steel 23 C 6 Since the corrosion resistance of the super austenitic stainless steel is drastically reduced by the carbide, the carbon of the present invention is controlled to be 0.03% or less, preferably 0.015% or less in terms of raw material addition and cost.
Silicon: silicon is added as deoxidizing element, and a certain amount of silicon is added in the smelting process of the super austenitic stainless steel to help reduce the oxygen content in the steel, and in addition, silicon is also helpful for improving the high-temperature oxidation resistance of the super austenitic stainless steel. However, too high a silicon content may result in the generation of nonmetallic inclusions, which are detrimental to the toughness and plasticity and corrosion resistance of the super austenitic stainless steel. The superaustenitic stainless steel of the invention has a silicon content of below 0.8%, preferably 0.2-0.6%.
Manganese: manganese has the effect of stabilizing austenite, is an austenite forming element, can obviously improve the strength of the super austenitic stainless steel, can replace part of nickel in the invention so as to reduce the cost of the stainless steel, and in addition, the nitrogen element is intentionally added, the manganese can obviously improve the solubility of nitrogen in the steel, thereby ensuring that the effect of adding nitrogen is fully exerted. The manganese content in the super austenitic stainless steel of the present invention is set to 2.0-4.0%, preferably 2.5-3.5%.
Phosphorus, sulfur: phosphorus and sulfur are both unavoidable impurity elements in steel, and their contents are too high to cause deterioration of various properties of steel, particularly corrosion resistance, strength and the like, and the phosphorus content is controlled to be 0.030% or less, the sulfur content is controlled to be 0.01% or less, and the lower the phosphorus and sulfur content is, the better, but are limited by cost factors and raw material conditions, preferably phosphorus is 0.005-0.03%, and sulfur is 0.002-0.01%.
Nickel: nickel is an austenite stabilizing element, has the effect of forming austenite, can obviously improve the strength, corrosion resistance, high-temperature strength and high-temperature oxidation resistance of the super-austenitic stainless steel, controls the nickel content to be 11.0-14.5%, leads to the cost increase of the super-austenitic stainless steel due to the excessive nickel content, and preferably controls the nickel content to be 12.0-13.5%.
Chromium: chromium is the most important element for ensuring corrosion resistance of the super austenitic stainless steel, but chromium is a ferrite forming element, and too high a content of chromium affects the obtaining of an austenitic phase in the super austenitic stainless steel and causes an increase in cost, so that the chromium content is controlled to 18.0 to 24.0%, preferably 19.0 to 23.0%.
Molybdenum: molybdenum is an important element for improving corrosiveness and pitting corrosion in super austenitic stainless steel, but the molybdenum is easy to segregate, the higher the molybdenum content is, the more obvious the segregation trend is, and too high molybdenum also can deteriorate plasticity and cause the deterioration of workability, and comprehensively considered, the molybdenum content of the invention is set to be 5.0-7.0%.
Nitrogen: nitrogen is a strong austenite forming element, can effectively stabilize austenite, can remarkably improve corrosion resistance and strength, and can be used as a substitute element of nickel, but as described above, the solubility of nitrogen in steel is very limited, and manganese needs to be added to improve the solubility of nitrogen in steel. The nitrogen content of the present invention is set to 0.15 to 0.40%, preferably 0.20 to 0.35%.
Zirconium and yttrium: zirconium and yttrium are microelements added by the invention, and the inventor of the invention researches and discovers that the segregation phenomenon of molybdenum in the super austenitic stainless steel can be effectively controlled by adding trace yttrium and zirconium and simultaneously cooperatively controlling the content relation of yttrium, zirconium and molybdenum, and the inventor of the invention summarizes and verifies the segregation phenomenon through a large number of experiments although the mechanism is not clear. Thus, based on the experiments of the present inventors, it was found that the zirconium content was controlled to be 0.001 to 0.005% and the yttrium content was controlled to be 0.003 to 0.008% while controlling ([ Mo ]]/96)=k×([Zr]/91+[Y]/89) andkwhen the alloy is=718-1135, the segregation behavior of molybdenum element in the super austenitic stainless steel can be effectively relieved.
As a further improvement, PREN of the low Mo segregation super austenitic stainless steel is not less than 43, wherein PREN= [ Cr ] +3.3× [ Mo ] +16× [ N ], wherein [ Cr ], [ Mo ], [ N ] respectively represent the weight percentage of Cr, mo, N, excellent pitting corrosion resistance can be obtained by limiting PREN to 43 or more, and PREN is preferably controlled to 45 or more.
By way of non-limiting illustration, the element segregation coefficient C of Mo in the low Mo segregation super austenitic stainless steel Mo Within + -3%, wherein C Mo = (C 2 -C 1 )/C 1 ×100%，C 1 Is the theoretical content of Mo element in super austenitic stainless steel, C 2 Mo content actually measured for any point of the super austenitic stainless steel. According to the invention, the content relation of zirconium, yttrium and molybdenum elements is simultaneously and cooperatively controlled through the addition of trace zirconium and trace yttrium, so that the super austenitic stainless steel with small molybdenum element segregation is finally obtained, and the segregation coefficient of Mo is within +/-3%.
By way of non-limiting illustration, the low Mo segregation super austenitic stainless steel is of the type of bar, plate, tube, wire, sheet, etc., and the super austenitic stainless steel can be formed into any desired shape according to specific requirements to meet the requirements under the corresponding operating conditions. Since the Mo content segregation behavior of the super austenitic stainless steel is effectively controlled, the super austenitic stainless steel has quite uniform pitting corrosion resistance, and can be applied to any field where the traditional super and austenitic stainless steel is possibly applied as a good substitute.
By way of non-limiting illustration, the low Mo segregation super austenitic stainless steel is in an as-cast state, a rolled state, a forged state, etc., and the super austenitic stainless steel of the present invention can be manufactured into any state of parts, such as an as-cast state, a rolled state, a forged state, etc., according to practical application requirements, and since the molybdenum content segregation phenomenon of the super austenitic stainless steel of the present invention is not obvious, the present invention is suitable for the preparation of any state of structural members suitable for the super austenitic stainless steel.
By way of non-limiting illustration, the low Mo segregation super austenitic stainless steel is applied in the fields of petroleum, natural gas, ocean engineering, paper making, garbage disposal, coal chemical industry, flue gas treatment, thermal power plants, nuclear power plants, etc. The super austenitic stainless steel has uniform pitting corrosion resistance due to uniform Mo element distribution, and has longer service life reliability when being applied to the severe corrosion environment.
The invention has the following technical effects.
The invention is improved based on the traditional super austenitic stainless steel, aiming at the problem of serious molybdenum segregation, trace zirconium and yttrium are added, and the content relation of the zirconium, the yttrium and molybdenum elements is cooperatively controlled, so that the segregation behavior of the molybdenum element in a super austenitic stainless steel matrix is effectively lightened, the super austenitic stainless steel with uniform molybdenum content distribution is obtained, and the uniform molybdenum content distribution is beneficial to obtaining the super austenitic stainless steel with uniform pitting resistance because molybdenum is an important element influencing the pitting corrosion performance of the super austenitic stainless steel.
Detailed Description
In order to enable those skilled in the art to fully understand the technical scheme and the beneficial effects of the present invention, the following description is made with reference to specific test examples.
The super austenitic stainless steel liquid was melted and cast according to the relation between the designed composition and the element content to obtain a test sample, wherein the P content was controlled to 0.015.+ -. 0.001%, and the S content was controlled to 0.008.+ -. 0.001%, the designed composition is shown in Table 1, whereink=([Mo]/96)/([Zr]/91+[Y]/89)，[Mo]、[Zr]、[Y]Representing the weight percentages of Mo, zr and Y respectively. The test sample sizes were: the test samples were tested for Mo content at 5 sites of 300mm in diameter by 600mm in length, wherein the test results of examples 1 to 8 are shown in Table 2, the test results of comparative examples 9 to 20 are shown in Table 3, sampling and preparation were performed as required in section 10 of GB/T20066-2006, wherein the sites selected at the center of the test sample were designated C, the other sites were randomly selected and individually designated A, B, D, E, and the closest distance between the edges of the five sites A to E was required to be greater than 100mm, and C in tables 2 to 3 Mo = (C 2 -C 1 )/C 1 ×100%，C 1 Is the theoretical content of Mo element in super austenitic stainless steel, C 2 Mo content actually measured for any point of the super austenitic stainless steel.
Table 1: the design components of the super austenitic stainless steel are in percent, and the balance is Fe.
Table 2: mo content detection results and Mo content segregation coefficients of examples 1 to 8.
Table 3: mo content detection results and Mo content segregation coefficients of comparative examples 9 to 20.
Further analysis of the above examples and comparative examples is described below in conjunction with tables 1-3.
Test numbers 1 to 8 in Table 1 satisfy the component content requirements and the present inventionkAs can be seen from Table 2, the test results show that the measured Mo content of each part is close to the designed Mo content, the segregation coefficient is within + -3%, which indicates that the element segregation is smaller and meets the requirement of the invention, and the invention can prove that the content control and the content relation of the components are adoptedkThe segregation phenomenon of Mo in the super austenitic stainless steel can be effectively reduced by controlling the value. Mo and/or Y and/or Zr and/or for test Nos. 9-20kAs can be seen from Table 3, the test results show that the measured Mo content of each part has larger deviation from the designed Mo content, and the segregation coefficient is larger, which indicates that the element segregation of Mo is serious and the requirement of the invention can not be met.
As comparative examples 9, 10 and 11, as comparative examples of examples 1, 2 and 3, zr, Y and Zr content were adjusted, respectively, and the adjusted Zr and Y were still within the scope of the present invention, but the adjusted Zr and Y were still within the scope of the present inventionkThe final Table 3 shows that the test samples of comparative examples 9, 10 and 11 have severe segregation of Mo element, and do not satisfy the requirements of the present inventionkControl of the values is critical to achieving the technical effect of the present invention.
As comparative examples 15, 16, 17 and 18 were comparative examples of examples 7, 8, 2 and 3, respectively, the content of Zr, Y, mo, mo was adjusted, and the adjusted Zr, Y and Mo contents were out of the range required by the present invention, although they werekThe values still meet the requirements of the present invention, but the results of the final table 3 show that the Mo element segregation is severe in the test samples of comparative examples 15, 16, 17, 18, and the requirements of the present invention cannot be satisfied, indicating that the control of Zr, Y, and Mo contents is critical to obtain the technical effects of the present invention.
As comparative examples 12, 13 and 14 were comparative examples of examples 4, 5 and 6, respectively, the contents of Y, zr and Y were adjusted, and the adjusted contents of Zr and Y were not the sameWithin the scope of the invention claim andkthe final Table 3 shows that the comparative examples 12, 13 and 14 have serious segregation of Mo element in the test samples, and cannot meet the requirements of the present invention, indicating Zr and Y contents andkcontrol of the values is critical to achieving the technical effect of the present invention.
As comparative examples of examples 1 and 4, comparative examples 19 and 20 were used, in which equal amounts of Zr and Y were used to replace all of Y and Zr in the examples, respectively, i.e., comparative example 19 added only Zr and comparative example 20 added only Y, although after replacementkThe values were still within the scope of the present invention, and the Zr and Y element contents were also within the scope of the present invention after substitution, but the results of table 3 showed that the Mo element contents in the test samples of comparative examples 19, 20 were also largely segregated, although the degree of segregation was reduced, but the requirements within ±3% of the present invention were not met, indicating that the complex addition of Y and Zr was essential to obtain the technical effects of the present invention.
By combining the above, the invention finally obtains the super austenitic stainless steel with uniform Mo element distribution and slight segregation by adding trace Zr and Y and cooperatively controlling the content relation of Zr, Y and Mo, and the super austenitic stainless steel can be expected to have uniform pitting corrosion resistance due to the uniform Mo element distribution, has high working reliability in corrosive environments and long working life, and is suitable for the preparation of various structural members.
The above description of the embodiments is only for aiding in the understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The low Mo segregation super austenitic stainless steel is characterized by comprising the following components in percentage by weight: c is less than or equal to 0.03 percent, si is less than or equal to 0.80 percent, mn:2.0-4.0%, P is less than or equal to 0.030%, S is less than or equal to 0.010%, ni:11.0-14.5%, cr:18.0-24.0%, mo:5.0-7.0%, N:0.15-0.40%, zr:0.001-0.005%, Y:0.003-0.008%, and the balance of Fe and unavoidable impurities, and the super austenitic stainless steel further satisfies the following relationship: ([ Mo)]/96)=k×([Zr]/91+[Y]/89)，k=718-1135, where [ Mo]、[Zr]、[Y]Representing the weight percentages of Mo, zr and Y respectively.
2. The low Mo segregation super austenitic stainless steel according to claim 1, wherein PREN ∈43, pren= [ Cr ] +3.3× [ Mo ] +16× [ N ], wherein [ Cr ], [ Mo ], [ N ] represent the weight percentage of Cr, mo, N, respectively.
3. The low Mo segregation super austenitic stainless steel according to any of the claims 1 to 2, wherein the element segregation coefficient C of Mo in the super austenitic stainless steel Mo Within + -3%, wherein C Mo =(C 2 -C 1 )/C 1 ×100%，C 1 Is the theoretical content of Mo element in super austenitic stainless steel, C 2 Mo content actually measured for any point of the super austenitic stainless steel.
4. A low Mo segregation super austenitic stainless steel according to any of the claims 1-3, characterized in that the super austenitic stainless steel is of the product type of bar, plate, tube, wire, sheet etc.
5. The low Mo segregation super austenitic stainless steel according to any of the claims 1 to 4, wherein the super austenitic stainless steel is in as-cast, rolled, as-forged etc.
6. The low Mo segregation super austenitic stainless steel according to any of claims 1 to 5, wherein the super austenitic stainless steel is applied in the fields of petroleum, natural gas, marine engineering, paper making, garbage disposal, coal chemical industry, flue gas disposal, thermal power plants, nuclear power plants, etc.
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