CN106521355A - Double-phase stainless steel as well as preparation method and application thereof - Google Patents
Double-phase stainless steel as well as preparation method and application thereof Download PDFInfo
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- CN106521355A CN106521355A CN201611049285.3A CN201611049285A CN106521355A CN 106521355 A CN106521355 A CN 106521355A CN 201611049285 A CN201611049285 A CN 201611049285A CN 106521355 A CN106521355 A CN 106521355A
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- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 49
- 239000010935 stainless steel Substances 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 22
- 229910000754 Wrought iron Inorganic materials 0.000 claims description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- 238000013461 design Methods 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 9
- 238000005242 forging Methods 0.000 claims description 6
- 238000003723 Smelting Methods 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 229910052593 corundum Inorganic materials 0.000 claims description 3
- 230000007547 defect Effects 0.000 claims description 3
- 238000007499 fusion processing Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000007670 refining Methods 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 238000004381 surface treatment Methods 0.000 claims description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 abstract description 15
- 238000005260 corrosion Methods 0.000 abstract description 15
- 229910052804 chromium Inorganic materials 0.000 abstract description 9
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 8
- 229910052799 carbon Inorganic materials 0.000 abstract description 7
- 229910052759 nickel Inorganic materials 0.000 abstract description 7
- 229910001566 austenite Inorganic materials 0.000 abstract description 6
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 6
- 238000003466 welding Methods 0.000 abstract description 6
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 20
- 239000011651 chromium Substances 0.000 description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 14
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 235000016768 molybdenum Nutrition 0.000 description 6
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 5
- 239000011733 molybdenum Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910000906 Bronze Inorganic materials 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 229910021386 carbon form Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 description 1
- 150000001845 chromium compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 150000004965 peroxy acids Chemical class 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 229910003470 tongbaite Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000005406 washing 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
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
- B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/18—Electroslag remelting
-
- 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
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to a double-phase stainless steel as well as a preparation method and application thereof. The double-phase stainless steel is prepared from the following components in percentage by mass: less than or equal to 0.03 percent of C, 24.00 to 26.00 percent of Cr, 6.00 to 7.50 percent of Ni, 2.50 to 3.00 percent of Mo, 0.14 to 0.20 percent of N and the balance of Fe and unavoidable impurities. A welding core prepared from the double-phase stainless steel material can be used for making a ferrite and austenite double-phase weld structure, and a welded part his excellent in mechanical property and corrosion resistance.
Description
Technical field
The present invention relates to two phase stainless steel field, more particularly to a kind of two phase stainless steel and its preparation method and application.
Background technology
After two phase stainless steel solution treatment, it is made up of about 50% ferrite and 50% austenitic duplex at room temperature.Two
The characteristics of presence of phase constitution makes two phase stainless steel have ferritic stainless steel and austenitic stainless steel concurrently.With austenitic stainless steel phase
Than the intensity of two phase stainless steel, particularly yield strength are significantly improved, and intergranular corrosion resistance, anticorrosion stress-resistant, anti-wear performance are notable
Improve.With ferritic stainless steel ratio, its toughness is improved, brittle transition temperature is reduced, intergranular corrosion resistance and weldability are significantly improved,
The little advantage of ferritic steel heat conductivity height, the coefficient of expansion is remained simultaneously.
At present, two phase stainless steel is used widely in fields such as oil, natural gas, papermaking, desalinization and chemical industry,
In particular for the part of appliance of special chemical environment.Its 2205 two phase stainless steel of Typical Representative trade mark is in air pollution control
The fields such as equipment, chemical tanker successfully instead of 316L austenitic stainless steels.Develop 2304 two-phases of more than two decades not
Although rust steel is not so good as 2205 two phase stainless steels in performance, big in nickel, molybdenum price fluctuation, its cost of material exceedes austenite not
Between rust steel and two phase stainless steel in the case of price difference, it is stainless that 2304 two phase stainless steels just become splendid replacement 316L of cost
The ideal material of steel.
Research at present both at home and abroad to two phase stainless steel is a lot, in such as Chinese patent application CN 101613839A, nickel is contained
Amount control can effectively reduce production cost below 1.0%；Such as Chinese patent application CN 101215674A and CN
In 101768705A, rare precious metal in two phase stainless steel is reduced by adding trace rare-earth element while acquisition combination property is excellent
Good two phase stainless steel.And for example United States Patent (USP) US6551420 provides a kind of EN 1.4401 (ASTM 316) type austenitic stainless steel
And the inexpensive succedaneum to two-phase stainless steel grade 2205, two kinds of compositionss, the scope of every kind of element is described in embodiment
Represent below by weight %：0.018-0.021% carbon, 0.46-0.50% manganese, 0.022% phosphorus, 0.0014-0.0034%
Sulfur, 0.44-0.45% silicon, 20.18-20.25% chromium, 3.24-3.27% nickel, 1.80-1.84% molybdenums, 0.21% bronze medal, 0.166-
0.167% nitrogen and 0.0016% boron, which has the corrosion resistance higher than EN 1.4401, and for used in chloride environment
It is particularly advantageous.Research in terms of for core wire, Chinese patent CN104668819B provide a kind of 2205 phase stainless steel use
Metal flux-cored wire, is made up of the component of following mass percent：Ni10%-15%, Cr30%-40%, Mo8%-14%,
Mn2%-4%, remaining is ferrum, and above constituent mass percentage ratio sum is 100%, but the mechanical performance of the welding wire is far from full
The needs of the special chemical industry equipment of foot.
The content of the invention
In order to solve the above-mentioned problems in the prior art, the present invention provides a kind of two-phase stainless Steel material and its preparation
Methods and applications, the core wire prepared with two-phase stainless Steel material can obtain ferrite and austenitic duplex seam organization, welding
Position has excellent mechanical performance and corrosion resistance.
The present invention is adopted the following technical scheme that：A kind of two-phase stainless Steel material, it is composed of the following components by mass percentage：
C≤0.03%,
Cr 24.00～26.00%,
Ni 6.00～7.50%,
Mo 2.50～3.00%,
N 0.14～0.20%,
Surplus is Fe and inevitable impurity.
The present invention preferred embodiment in, the impurity is：
Si≤0.80%,
P≤0.020%,
S≤0.010%.
The present invention preferred embodiment in, the two-phase stainless Steel material is composed of the following components：
C≤0.02%,
Cr 24.00～25.00%,
Ni 6.00～7.00%,
Mo 2.80-3.00%,
N 0.15～0.20%,
Surplus is Fe and inevitable impurity.
The present invention preferred embodiment in, the two-phase stainless Steel material is composed of the following components：
C≤0.01%,
Cr 24.00%,
Ni 6.00%,
Mo 3.00%,
N 0.20%,
Surplus is Fe and inevitable impurity.
The present invention also protects the preparation method of above-mentioned two-phase stainless Steel material, comprises the following steps：
(1) melting in non-vacuum induction furnace of required element, 1400～1600 DEG C of smelting temperature are taken；Adjust in fusion process
The content of section each element so as to which weight ratio meets design requirement, the content for controlling impurity element is as far as possible low, and solution pours into consumable
Electrode；
(2) by consutrodes in electroslag furnace remelting refining, further reduce impurity element content so as to meet design
Require, remelting is CaF into ESR ingot, wherein slag system2:Al2O3:CaO:MgO=60:25:10:5 (mass percents), voltage 56V
±2V；7500 ± 300A of electric current；
(3) ESR ingot heats forged is made into rod iron, rod iron is heated to into 1100-1300 DEG C and is incubated 2～4 hours, started
Forging；
(4) spread out after rod iron forging and be air cooled to room temperature；
(5) rod iron surface treatment, enters optical processing of driving a vehicle to finished product rod iron surface, eliminate surface defect and make rod iron size,
Shape, surface quality meet design requirement.
The present invention preferred embodiment in, the smelting temperature be 1530～1550 DEG C.
The present invention preferred embodiment in, in step (3) rod iron heating temperature be 1190 DEG C.
The present invention also protects application of the above-mentioned two-phase stainless Steel material in chemical industry equipment core wire is prepared, wherein core wire to press
Mass percent is composed of the following components：
C≤0.03%,
Cr 24.00～26.00%,
Ni 6.00～7.50%,
Mo 2.50～3.00%,
N 0.14～0.20%,
Surplus is Fe and inevitable impurity.
The present invention preferred embodiment in, the impurity is：
Si≤0.80%,
P≤0.020%,
S≤0.010%.
The present invention preferred embodiment in, the core wire is composed of the following components：
C≤0.02%,
Cr 24.00～25.00%,
Ni 6.00～7.00%,
Mo 2.80～3.00%,
N 0.15～0.20%,
Surplus is Fe and inevitable impurity.
The present invention preferred embodiment in, the core wire is composed of the following components：
C≤0.01%,
Cr 24.00%,
Ni 6.00%,
Mo 3.00%,
N 0.20%,
Surplus is Fe and inevitable impurity.
Core wire of the present invention can be prepared using method well known in the prior art.
In the design with very good mechanical properties and the chemical composition of corrosion proof two phase stainless steel of the present invention：
Carbon：Carbon is strong austenite former, and its austenitic formation functions as 30 times of Ni, therefore to a certain extent
Ni can be replaced, promote the formation of austenite structure.But when carbon content is too high, carbon forms chromium-rich in crystal boundary after being combined with chromium
Carbide, causes intercrystalline corrosion.Especially in welding process, carbide is separated out rapidly, will cause the corrosion resistance of weld zone
Can be remarkably decreased with mechanical property.Too low carbon content will increase difficulty and cost in preparation process.Therefore, in steel of the present invention
Carbon content control is≤0.03%, and optimum is≤0.01%.
Chromium：Chromium is most important element in rustless steel.Chromium is to determine the corrosion proof main element of rustless steel, is also a kind of ferrum
Ferritic formation element, while can stable austenite.For two phase stainless steel, when chromium content is relatively low, corrosion resistance will decline, together
When reduce the stability of tissue, it is unfavorable with decay resistance to mechanics, but when chromium content is too high, can not only increase between metal
The precipitation tendency of phase, carbide and nitride, increases cost, it is often more important that can be unfavorable to its mechanical performance.Therefore it is of the invention
In steel, Cr contents are controlled to 24.00-26.00%, and optimum is 24.00%
Nitrogen：Nitrogen is indispensable important element in modern two phase stainless steel.N first is a kind of formation and stable Austria
The element of family name's body phase, the austenitic formation ability of nitrogen are 30 times of nickel.Additionally, nitrogen can improve the corrosion resistance of austenite phase
Energy, especially resistance to spot corrosion performance and slit and corrosion resistant performance, despite as above advantage, but nitrogen can significantly reduce two phase stainless steel
Mechanical performance.Therefore, 0.14～0.20%, optimum is 0.20% for nitrogen in steel content control of the present invention
Molybdenum：Molybdenum is very beneficial for improving the decay resistance of steel, especially in the case of with chromium compound action, its resistance to point
Erosion equivalent is 3.3 times of chromium.What is more important, Mo can improve the thermoplasticity of two phase stainless steel, therefore Mo contents are controlled
More than 2.5%.But molybdenum content is too high to be separated out the acceleration for causing phase between brittle metal, it is unfavorable for producing and applies, therefore
2.50～3.00%, optimum is 3.00% for molybdenum content control in steel of the present invention.
Nickel：Nickel is austenizer, during with other components matching design, can effectively adjust two-phase stainless Steel material
Mechanical performance.
Impurity Si, S and P are very big for the mechanical performance harm of two phase stainless steel, so two phase stainless steel will be reduced as far as possible
In impurity content, the present invention in Si≤0.80%, P≤0.020%, S≤0.010%..
Compared with prior art, the beneficial effects of the present invention is：Using formula design and processes method as above
The two-phase stainless Steel material for preparing has excellent mechanical property and mechanical performance, and corrosion resistance is good, wherein resists
Tensile strength Rm >=750Mpa；Yield strength Rp0.2 >=580Mpa；Percentage elongation A >=30%, far above product of the prior art
Related two phase stainless steel in 316L and background technology.Present invention is particularly suitable in special chemical industry equipment preparation process
The high tensile strength of welding welding rod, such as those limit, peracid is high-alkali and environment under high pressure.
Specific embodiment
Two-phase stainless Steel material is prepared, is comprised the following steps：
(1) melting in non-vacuum induction furnace of required element, 1550 DEG C of smelting temperature are taken；Each unit is adjusted in fusion process
The content of element so as to which weight ratio meets design requirement, the content for controlling impurity element is as far as possible low, and solution pours into consutrodes；
(2) by consutrodes in electroslag furnace remelting refining, further reduce impurity element content so as to meet design
Require, remelting is CaF into ESR ingot, wherein slag system2:Al2O3:CaO:MgO=60:25:10:5 (mass percents), voltage 56V
±2V；7500 ± 300A of electric current；
(3) ESR ingot heats forged is made into rod iron, rod iron is heated to into 1190 DEG C and is incubated 2～4 hours, start forging；
(4) spread out after rod iron forging and be air cooled to room temperature；
(5) rod iron surface treatment, enters optical processing of driving a vehicle to finished product rod iron surface, eliminate surface defect and make rod iron size,
Shape, surface quality meet design requirement.
The alloy composition of the two-phase stainless Steel material of following embodiment 1-4 is as shown in table 1.
The chemical composition (unit is %) of 1 embodiment of table and comparative example
Note：Wherein 316L is commercially available.
The pick test mechanical property on finished product rod iron, sample heat treatment step and technological parameter it is as follows：Solution treatment：
1060 ± 10 DEG C, insulation >=0.5h, water-cooled.Tension test is carried out under room temperature (25 DEG C), as a result as shown in table 2.
Every mechanical performance of 2 embodiment of table
It can be seen that, the two-phase stainless Steel material prepared using above-mentioned material and corresponding process method, the examination of Jing normal temperature mechanical properties
Test, as a result show its excellent in mechanical performance, and be far above comparative example 1 and commercially available 316L, the mechanical performance of embodiment 4 is particularly dashed forward
Go out.The core wire prepared using above-mentioned formula, its every mechanical performance Jing test are same as described above, use it for gas washing in SA production
In equipment and urea synthesis equipment, compared with common commercially available core wire, its corrosion-resistant time and service life have 2-3 times of increasing
Plus.
The above, the only specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any
The change or replacement expected without creative work, should all be included within the scope of the present invention.Therefore, it is of the invention
The protection domain that protection domain should be limited by claims is defined.
Claims (10)
1. a kind of two-phase stainless Steel material, it is characterised in that composed of the following components by mass percentage：
C≤0.03%,
Cr 24.00～26.00%,
Ni 6.00～7.50%,
Mo 2.50～3.00%,
N 0.14～0.20%,
Surplus is Fe and inevitable impurity.
2. two-phase stainless Steel material according to claim 1, it is characterised in that composed of the following components：
C≤0.02%,
Cr 24.00～25.00%,
Ni 6.00～7.00%,
Mo 2.80-3.00%,
N 0.15～0.20%,
Surplus is Fe and inevitable impurity.
3. two-phase stainless Steel material according to claim 1, it is characterised in that composed of the following components：
C≤0.01%,
Cr 24.00%,
Ni 6.00%,
Mo 3.00%,
N 0.20%,
Surplus is Fe and inevitable impurity.
4. two-phase stainless Steel material according to claim 1, it is characterised in that the impurity is：
Si≤0.80%,
P≤0.020%,
S≤0.010%.
5. the preparation method of the two-phase stainless Steel material any one of claim 1-4, it is characterised in that including following step
Suddenly：
(1) melting in non-vacuum induction furnace of required element, 1400～1600 DEG C of smelting temperature are taken；Adjust in fusion process each
The content of element so as to which weight ratio meets design requirement, the content for controlling impurity element is as far as possible low, and solution is poured into from power consumption
Pole；
(2) by consutrodes in electroslag furnace remelting refining, further reduce impurity element content so as to meet design will
Ask, remelting is CaF into ESR ingot, wherein slag system2:Al2O3:CaO:MgO=60:25:10:5 (mass percents), voltage 56V ±
2V；7500 ± 300A of electric current；
(3) ESR ingot heats forged is made into rod iron, rod iron is heated to into 1100-1300 DEG C and is incubated 2～4 hours, start forging；
(4) spread out after rod iron forging and be air cooled to room temperature；
(5) rod iron surface treatment, enters optical processing of driving a vehicle to finished product rod iron surface, eliminate surface defect and make rod iron size, shape,
Surface quality meets design requirement.
6. the preparation method described in claim 5, it is characterised in that the smelting temperature is 1530～1550 DEG C.
7. the preparation method described in claim 5, it is characterised in that the temperature of rod iron heating is 1190 DEG C in step (3).
8. application of the two-phase stainless Steel material any one of claim 1-4 in chemical industry equipment core wire is prepared, its
Middle core wire is composed of the following components by mass percentage：
C≤0.03%,
Cr 24.00～26.00%,
Ni 6.00～7.50%,
Mo 2.50～3.00%,
N 0.14～0.20%,
Surplus is Fe and inevitable impurity.
9. application according to claim 8, it is characterised in that the core wire is composed of the following components：
C≤0.02%,
Cr 24.00～25.00%,
Ni 6.00～7.00%,
Mo 2.50～2.80%,
N 0.15～0.20%,
Surplus is Fe and inevitable impurity.
10. application according to claim 8, it is characterised in that the core wire is composed of the following components：
C≤0.01%,
Cr 24.00%,
Ni 6.00%,
Mo 3.00%,
N 0.20%,
Surplus is Fe and inevitable impurity.
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Address after: 621700 West Section of Baolun Road, Henan Industrial Park, Jiangyou City, Mianyang City, Sichuan Province Patentee after: Sichuan Liuhe Special Metal Materials Co., Ltd. Address before: 621700 West Section of Baolun Road, Henan Industrial Park, Jiangyou City, Mianyang City, Sichuan Province Patentee before: Sichuan Liuhe Forging Company Ltd. |