CN104328353A - Rare-earth-type 0Cr17Ni4Cu4Nb martensitic precipitation-hardening stainless steel and preparation method thereof - Google Patents

Rare-earth-type 0Cr17Ni4Cu4Nb martensitic precipitation-hardening stainless steel and preparation method thereof Download PDF

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CN104328353A
CN104328353A CN201410717711.0A CN201410717711A CN104328353A CN 104328353 A CN104328353 A CN 104328353A CN 201410717711 A CN201410717711 A CN 201410717711A CN 104328353 A CN104328353 A CN 104328353A
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rare earth
rare
temperature
steel
earth
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CN201410717711.0A
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CN104328353B (en
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向花红
王俊
周乐军
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什邡新工金属材料有限公司
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/04Making ferrous alloys by melting
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/005Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/008Martensite

Abstract

The invention discloses rare-earth-type 0Cr17Ni4Cu4Nb martensitic precipitation-hardening stainless steel. The rare-earth-type 0Cr17Ni4Cu4Nb martensitic precipitation-hardening stainless steel is characterized by comprising the following chemical components in percentage by weight: less than or equal to 0.07% of C, less than or equal to 1% of Si, less than or equal to 1% of Mn, less than or equal to 0.035% of P, less than or equal to 0.03% of S, 3.00-5.00% of Ni, 15.5-17.5% of Cr, 3.00-5.00% of Cu, 0.15-0.45% of Nb, 0.05-0.25% of Re and the balance of Fe and belongs to the field of alloy steels. The invention also discloses a preparation method of the rare-earth-type 0Cr17Ni4Cu4Nb martensitic precipitation-hardening stainless steel. The preparation method comprises the steps of smelting, casting, carrying out electroslag remelting, casting ingots, forging or rolling, carrying out solution treatment and the like. The rare-earth-type 0Cr17Ni4Cu4Nb special steel, which is disclosed by the invention, as one of precipitation-hardening martensitic stainless steel, has the characteristics of high strength, high hardness, corrosion resistance and the like and is suitable for various technical fields, such as chemical machinery, food machinery, papermaking machinery, aerospace and marine.

Description

A kind of rare-earth type 0Cr17Ni4Cu4Nb martensitic precipitation and preparation method thereof
Technical field
The present invention relates to a kind of Chromium Stainless Steel, particularly a kind of 0Cr17Ni4Cu4Nb martensitic precipitation and preparation method thereof, belongs to field of alloy steel.
Background technology
China's technical equipment improves constantly in recent years, for the application of stainless special steel material and demand increasing, but some special industry fields are because require high to the over-all properties of steel, typical single-phase stainless steel is difficult to meet its demand.Typical 0Cr18Ni9 type austenitic stainless steel has excellent welding property and pressure machining characteristics, but does not have the stainless high strength of martensitic chromium.
Typical 0Cr17Ni4Cu4Nb stainless steel is a kind of high strength precipitation hardenable Martensite Stainless Steel, excellent corrosion resistance after special processing, and keep the intensity of superelevation and good plastic working ability, be widely used in the fields such as aerospace, turbine blade, foodstuffs industry and offshore platform.But, due in order to stable material metallographic structure, improve Cu element that materials processing performance and solidity to corrosion add after Wetted constructures, separate out ε-Cu Ion Phase, Dispersed precipitate is at the intra-die of material and grain boundaries, and timeliness transformation stress becomes the Brittleness Cracking Sensitivity that crack stress source exacerbates material.For this reason, a kind of exploitation with the 0Cr17Ni4Cu4Nb martensitic precipitation of excellent corrosion resistance and processing characteristics more and more pay close attention to by people.
In recent years, along with rare earth element is used to high-quality field of alloy steel gradually, rare earth element is obvious to the effect improving steel metallurgical quality and product mechanical property, but on rare earth feed postition, if feed postition is improper, easily cause rare earth element because of molten steel secondary oxidation scaling loss, constant product quality is difficult to control, and is difficult to reach rare earth element and improves mechanical property, makes non-metallic inclusion sex change and improve the object of interiors of products metallographic structure.
Summary of the invention
The object of the invention is to overcome the technological difficulties that in prior art, 0Cr17Ni4Cu4Nb stainless steel Brittleness Cracking Sensitivity is higher, a kind of rare-earth type 0Cr17Ni4Cu4Nb special steel material is provided.Meanwhile, the present invention also adds rare earth for prior art, easily causes the problem of secondary oxidation scaling loss, provides one to add rare earth and prepares the stainless preparation technology of rare-earth type 0Cr17Ni4Cu4Nb of the present invention.
In order to realize foregoing invention object, the invention provides following technical scheme:
A kind of 0Cr17Ni4Cu4Nb alloy steel products, its Chemical Composition (wt%) is: C≤0.07, Si≤1.00, Mn≤1.00, P≤0.035, S≤0.03, Ni 3.00-5.00, Cr 15.5-17.5, Cu 3.00-5.00, Nb 0.15-0.45, Re 0.05 ~ 0.25, surplus is Fe.
Containing trace rare-earth element in rare-earth type 0Cr17Ni4Cu4Nb alloy steel products of the present invention, steel alloy mother liquor can not only be purified, and the solidified structure of energy refinement steel, change the character of non-metallic inclusion, form and distribution, thus improve the properties of steel.
Traditional technology is thought for stainless steel, and carbon (C) is a kind of harmful element, because under some conditions in stainless and anti-corrosion purposes, such as welded heat affecting zone or 650-850 DEG C heating, the Cr in C and steel forms the carbide Cr of high Cr 23c 6, this kind of carbide often appears at grain boundaries, and make carbide surrounding tissue occur poor Cr phenomenon, directly cause the corrosion resistance nature of steel, particularly intergranular corrosion resistance performance sharply declines.Therefore, when Composition Design, all the time using reducing C content as the important indicator weighed in its corrosion resisting property quality, but C content controls too low, can affect single austenite structure stability and increase smelting technology cost.
Rare-earth type steel alloy rare earth elements of the present invention can increase the solubleness of carbon, suppresses Cr 23c 6type is the precipitation of main rich Cr phase, and the rich Cr phase of refinement, makes the corrosion process of rich Cr phase and electrochemical process characteristic significantly improve.Simultaneously; rare earth is surface active element; be enriched in crystal boundary rare earth Re element can crystal grain thinning, change grain boundary state, make the Hypermobile effect of grain boundary dislocation; dislocation is become from a grain sliding to another crystal grain be more prone to; reduce the dislocation desity of intracrystalline, improve the moulding of steel and toughness.Simultaneously, rare earth Re element has cleaning action and Microalloying Effect in this steel alloy, it can not only desulfurization, degasification, and change oxide compound and oxide morphology, size and distribution in steel by the oxysulfide of Re element, very favorable impact created on the performance of steel.During Composition Design, rare earth element target value of the present invention controls by Re 0.15%, is added latter stage by external refining, and carries out composition regulation and control when esr by rare earth slag system.
Further, technical scheme of the present invention is also respectively with chromium equivalent (Cr eq) and nickel equivalent (Ni eq) based on C, Cr, Ni, Cu element in 0Cr17Ni4Cu4Nb steel is finely tuned, optimize Composition Design, strictly control Cr eq, Ni eq, make Cr eq≤ 16.5%, Ni eq>=7.5%, and then control delta ferrite level in steel.Improve Molten Steel Cleanliness, thinning solidification structure, change inclusion character, form and distribution by adding rare earth element in refining process and secondary refining process, thus improve the properties of steel grade.
When steel grade Composition Design, by following formula as foundation, Cr, Ni equivalent and martensite transformation temperature are calculated:
Cr eq=(%Cr)+1.5(%Si)+(%Mo)+1.5(%Ti);
Ni eq=30(%C+%N)+(%Ni)+0.5(%Mn+%Cu)+0.7(%Co);
M f(℃)=1303.2-41.67(%Cr)-61.11(%Ni)-33.33(%Mn)-27.78(%Si)-1666.67(%C+%N)
The present invention is when Composition Design, and by the requirement of Cr equivalent≤16.5%, steel grade Cr content target value is designed to 15.5%, and melting composition acceptability limit is 15.5%-16.0%.Cr is topmost alloying element in stainless steel.Stainless rustless property and corrosion proof acquisition are due under medium effect, and Cr facilitates the passivation of steel and makes steel surface remain the result of stable passivation state.Cr is huge on stainless solidity to corrosion impact, and be mainly manifested in Cr and improve the resistance to oxidation medium of steel and the performance of acid chloride medium, the height of Cr constituent content also affects the intergranular corrosion resistance of steel, electrocorrosion, crevice corrosion ability.Cr content is too low will have a strong impact on the solidity to corrosion of steel, in addition, itself or ferrite former, in precipitation hardening of martensitic stainless steel, martensitic matrix tissue is produced by ferrite → austenite → martensitic stucture phase transformation, and certain Cr eq, Ni eqratio is the precondition keeping steel grade martensitic matrix, and steel therefore must be made to keep certain C r content that product just can be made to have stable matrix and solidity to corrosion when Composition Design.
The present invention, when Composition Design, by Ni equivalent weight requirements, controls C content in≤0.07% scope, and carbon (C) is a kind of strong formation and stable austenite and expand austenitic area element.C forms 30 times that austenitic ability is about nickel.Ni is the principal element in austenitic stainless steel, duplex stainless steel, PH Stainless Steel, its Main Function is formed and stable austenite tissue, in PH Stainless Steel steel, significantly can be changed the delta ferrite tissue content in steel grade solidified structure by adjustment Ni constituent content and Ni equivalent, make delta ferrite tissue content≤5% in alloy structure of the present invention.Therefore, when Composition Design, the melting composition acceptability limit that Ni constituent content target value is designed to 4.5%, Ni element is 4.5%-5.0%.
The present invention is when Composition Design, and in order to improve product hardness, plasticity and solidity to corrosion, Cu content target value is designed to 3.5%, and melting composition acceptability limit is 3.5%-4.0%.Cu significantly can reduce the cold-working work hardening tendency of steel in austenitic stainless steel, significantly improves solidity to corrosion and the cold-forming property of austenitic stainless steel; In martensitic precipitation, Cu time validity response time separate out with ε-Cu Ion Phase, mutually can significantly improve martensitic precipitation hardness and intensity as dispersion-strengthened.Meanwhile, time validity response time, along with the precipitation of dispersion copper Ion Phase, the plasticity of material also can obtain certain raising.
Rare-earth type 0Cr17Ni4Cu4Nb special steel material of the present invention is as the one being precipitation hardening of martensitic stainless steel, there is high strength, high rigidity and the characteristic such as anticorrosive, be applicable to multiple technical fields such as chemical machinery, food machinery, papermaking equipment, space flight navigation.
This invention also solves in steel alloy and add the easy scaling loss of rare earth element, be difficult to the problem of precisely adding, the invention provides following methods for this reason:
Prepare a method for above-mentioned rare-earth type 0Cr17Ni4Cu4Nb martensitic precipitation, comprise following processing step: smelting, casting, esr, ingot casting, forging or split rolling method, solution treatment.
Specifically comprise the following steps:
(1) smelt
Any one smelting technology in vacuum induction furnace, non-vacuum induction furnace, electric arc furnace+external refining, converter+external refining is adopted to smelt.
Smelting technology adds rare earth in external refining, adds rare earth content and calculate by the rate of recovery (the Re rate of recovery is minimum by 60%) before smelting and terminating latter stage.In refining smelting process, the strict rare earth that controls adds front molten steel temperature, and molten steel temperature controls by superheating temperature, and control rare earth and add the superheating temperature of front molten steel within 80 DEG C, molten steel fusing point calculates by following formula; Strict control rare earth adds rear refining furnace tap to tap time, require to add rear tap to tap time≤10min, after adding for preventing rare earth, rare earth element scaling loss affects the rate of recovery, and rare earth adds rear refining process no power in principle.
The fusing point of molten steel calculates as follows:
LIQ=1536-(0.1+83.9*C%+10*C%+12.6*Si%+5.4*Mn%+4.6*Cu%+5.1*Ni%+1.5*Cr%+3.3*Mo%+30*P%+37*S%+9.5*Nb%)
(2) cast
Casting can adopt die casting that continuous casting mode also can be adopted to carry out, and strictly controls pouring temperature during casting, requires that casting superheating temperature controls within 50 DEG C, takes to add the modes such as insulating covering agent and reduce molten steel secondary oxidation in casting cycle in casting cycle.
(3) esr
In the esr secondary refining process of steel of the present invention, adopt above-mentioned Chemical Composition ingot casting as electrode bar, slag system adopts essentially consist proportioning to be SeO 2-CaF 2-Al 2o 3the ternary RE slag system of=15:60:25 carries out remelting, for controlling slag system electromotive force, constantly the addition of C a-Si reductive agent and magnesia is evenly added to slag bath in reflow process, rare earth slag system object is adopted to be finely tune in real time Chemical Components of Liquid Steel, prevent because arc heat scaling loss causes molten steel melting Chemical Composition not reach above-mentioned Chemical Composition requirement, constantly make in fusion process slag system rare earth elements uniform and stable enter in Electro Slag Remelting Steel, ensure that molten steel Chemical Composition meets in target zone after esr.
(4) cast
Rapid (2) castingprocesses of castingprocesses control synchronization: can adopt die casting that continuous casting mode also can be adopted to carry out, strictly pouring temperature is controlled during casting, require that casting superheating temperature controls within 50 DEG C, take to add the modes such as insulating covering agent in casting cycle and reduce molten steel secondary oxidation in casting cycle.
(5) forging or rolling
According to user, ingot casting or strand require that steel specs carries out forging or rolling, ingot casting or slab heating temperature are 1150 DEG C-1180 DEG C, forging temperature or rolling temperature control at 1100 ~ 1150 DEG C, for prevent temperature finish-forging or finishing temperature too low, material internal residualinternal stress causes occurring crackle in product process of cooling, and final forging temperature or finishing temperature control are more than 950 DEG C.
(6) solution treatment
Section bar after hot-work or sheet material need eliminate residualinternal stress through solution annealing process, deformed microstructure is fully recovered and recrystallize, eliminates the phenomenons such as composition segregation.Annealing heating temperature range is 1020 DEG C-1050 DEG C, and insulation is not less than 30min, and the type of cooling is that stove outer space is chilled to and is cooled to below martensite transformation temperature; Preferably be cooled to less than 30 DEG C (because of martensite transformation temperature M fcalculated value is less than 32 DEG C, therefore needs to ensure that room temperature is less than 30 DEG C).
Martensite transformation temperature calculates:
M f(℃)=1303.2-41.67(%Cr)-61.11(%Ni)-33.33(%Mn)-27.78(%Si)-1666.67(%C+%N)
When the present invention smelts rare-earth type 0Cr17Ni4Cu4Nb material, on rare earth adding technology, take refining furnace refining and add rare earth element latter stage, the strict temperature controlling rare earth element and add front and back molten steel, as far as possible employing adds no power technique after rare earth element, reduces rare earth element scaling loss.And when esr, change slag system by adding rare earth element, when reducing because of esr secondary refining, the scaling loss that rare earth element produces because of arc heat.Finally, by optimizing forging (rolling), system of heat treatment process, rely on Deformation recrystallization, the Precipitation mechanism after thermal distortion, improve steel inside metallographic structure, thinning microstructure crystal grain, reduce deformation internal stress, improve product lumber recovery and comprehensive mechanical property.The rare-earth type 0Cr17Ni4Cu4Nb material primary quality measure obtained is compared with external high-quality same type of material, and quality index is obtained for lifting in various degree, as: foreign substance in molten steel, grain fineness number, tensile strength and lumber recovery etc.
Compared with prior art, beneficial effect of the present invention:
(1) rare-earth type 0Cr17Ni4Cu4Nb material internal metallurgical structure improves, and product grains refinement, changes crystal boundary non-metallic inclusion form and distribution, reduces material crack susceptibility, improves material finished product rate.
(2) rare-earth type 0Cr17Ni4Cu4Nb material resistance to corrosion is improved, and pitting corrosion, intergranular corrosion ability are better than existing 0Cr17Ni4Cu4Nb material.
(3) Molten Steel Cleanliness is greatly improved, and Plastic working " ability, ballistic work, intensity, hardness are significantly improved, and properties is better than existing 0Cr17Ni4Cu4Nb material.
Embodiment
Explanation of nouns: superheating temperature, the temperature head of molten steel temperature and its fusing point.
Below in conjunction with test example and embodiment, the present invention is described in further detail.But this should be interpreted as that the scope of the above-mentioned theme of the present invention is only limitted to following embodiment, all technology realized based on content of the present invention all belong to scope of the present invention.Per-cent not specified in the present invention is all weight percentage.
According to the Chemical Composition of a kind of rare-earth type 0Cr17Ni4Cu4Nb martensitic precipitation of the present invention, non-vacuum induction furnace has been smelted 3 stove steel of the present invention, the Chemical Composition (wt%) of 3 stove steel is as shown in table 1.Be cast into ingot casting after smelting, then carried out esr secondary refining by the processing step of its preparation method, after refining ingot casting carry out forging, solution treatment.Relevant parameters is as shown in table 2, subsequently, to product steel test, has carried out mechanics properties testing and metallographic structure analysis gained respectively and has recorded a demerit and list in table 3 and table 4 respectively.
In order to contrast, under identical appointed condition, also smelt with machined other composition of 1 stove identical with the present invention or close to but do not add the typical 0Cr17Ni4Cu4Nb steel grade steel as a comparison of rare earth element, its Chemical Composition and relevant parameters and performance are also listed in table 1, table 2, table 3 and table 4.
Table 1 rare-earth type 0Cr17Ni4Cu4Nb and typical 0Cr17Ni4Cu4Nb Chemical Composition contrast
Table 2 rare-earth type 0Cr17Ni4Cu4Nb and typical 0Cr17Ni4Cu4Nb preparation technology parameter contrast
Table 3 rare-earth type 0Cr17Ni4Cu4Nb and typical 0Cr17Ni4Cu4Nb mechanics properties testing contrast
Table 4 rare-earth type 0Cr17Ni4Cu4Nb and typical 0Cr17Ni4Cu4Nb metallographic structure detect and contrast
As seen from Table 3, add after rare earth material, the mechanical performance indexs such as the tensile strength of steel of the present invention, yield strength and unit elongation are better than typical 0Cr17Ni4Cu4Nb material.
As can be seen from Table 4, the level such as the high temperature of steel of the present invention remaining delta ferrite level, grain fineness number, inclusion grade, segregation grade is all better than typical 0Cr17Ni4Cu4Nb material index.

Claims (10)

1. a 0Cr17Ni4Cu4Nb alloy steel products, its Chemical Composition (wt%) is: C≤0.07, Si≤1.00, Mn≤1.00, P≤0.035, S≤0.03, Ni 3.00-5.00, Cr 15.5-17.5, Cu 3.00-5.00, Nb 0.15-0.45, Re 0.05 ~ 0.25, surplus is Fe.
2. alloy steel products according to claim 1, is characterized in that, chromium equivalent Cr eq≤ 16.5%,
Cr eq=(%Cr)+1.5(%Si)+(%Mo)+1.5(%Ti)。
3. alloy steel products according to claim 1, is characterized in that, nickel equivalent Ni eq>=7.5%,
Ni eq=30(%C+%N)+(%Ni)+0.5(%Mn+%Cu)+0.7(%Co)。
4. alloy steel products according to claim 1, is characterized in that, Cr content is 15.5%-16.0%.
5. alloy steel products according to claim 1, is characterized in that, Ni content is 4.5%-5.0%.
6. alloy steel products according to claim 1, is characterized in that, the content of Cu is 3.5%-4.0%.
7. prepare a method for above-mentioned rare-earth type 0Cr17Ni4Cu4Nb martensitic precipitation, comprise following processing step: smelting, casting, esr, ingot casting, forging or split rolling method, solution treatment.
8. preparation method according to claim 7, is characterized in that, comprises the following steps:
(1) smelt
Any one smelting technology in vacuum induction furnace, non-vacuum induction furnace, electric arc furnace+external refining, converter+external refining is adopted to smelt;
Add rare earth latter stage in external refining, add rare earth; Control rare earth and add the superheating temperature of front molten steel within 80 DEG C, molten steel fusing point calculates by following formula:
LIQ=1536-(0.1+83.9*C%+10*C%+12.6*Si%+5.4*Mn%+4.6*Cu%+5.1*Ni%+1.5*Cr%+3.3*Mo%+30*P%+37*S%+9.5*Nb%)
To add after rare earth tap to tap time≤10min;
(2) cast
Cast by the molten steel that step (1) obtains, casting superheating temperature controls within 50 DEG C;
(3) esr
When carrying out esr, ingot casting step (2) obtained is as electrode bar, and slag system adopts composition and ratio to be SeO 2-CaF 2-Al 2o 3the ternary RE slag system of=15:60:25 carries out remelting;
Evenly add Ca-Si reductive agent and magnesia to slag bath in reflow process, finely tune in real time, make in fusion process slag system rare earth elements uniform and stable enter in Electro Slag Remelting Steel;
(4) cast
Cast after molten steel calmness process step (3) obtained, casting superheating temperature controls within 50 DEG C;
(5) forging or rolling
The ingot casting obtain step (4) or strand carry out forging or rolling, and Heating temperature is 1150 DEG C-1180 DEG C, and forging temperature or rolling temperature control at 1100 ~ 1150 DEG C, and final forging temperature or finishing temperature control are more than 950 DEG C;
(6) solution treatment
By the alloy components solution treatment that step (5) obtains, wherein annealing heating temperature range is 1020 DEG C-1050 DEG C, and insulation is not less than 30min, is cooled to below martensite transformation temperature;
Martensite transformation temperature calculates as follows:
M f(℃)=1303.2-41.67(%Cr)-61.11(%Ni)-33.33(%Mn)-27.78(%Si)-1666.67(%C+%N)。
9. preparation method according to claim 8, is characterized in that, in step (1) smelting process, rare earth adds rear refining process no power.
10. preparation method according to claim 8, is characterized in that, in step (2), casting cycle adds insulating covering agent process.
CN201410717711.0A 2014-12-01 2014-12-01 A kind of rare-earth type 0Cr17Ni4Cu4Nb martensitic precipitations and preparation method thereof CN104328353B (en)

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CN107923022A (en) * 2015-07-16 2018-04-17 山特维克知识产权股份有限公司 Novel martensitic stainless steel
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